libavcodec/avcodec.h

   1 /*
   2  * copyright (c) 2001 Fabrice Bellard
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef AVCODEC_AVCODEC_H
  22 #define AVCODEC_AVCODEC_H
  23
  24 /**
  25  * @file libavcodec/avcodec.h
  26  * external API header
  27  */
  28
  29 #include <errno.h>
  30 #include "libavutil/avutil.h"
  31
  32 #define LIBAVCODEC_VERSION_MAJOR 52
  33 #define LIBAVCODEC_VERSION_MINOR 53
  34 #define LIBAVCODEC_VERSION_MICRO  0
  35
  36 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
  37                                                LIBAVCODEC_VERSION_MINOR, \
  38                                                LIBAVCODEC_VERSION_MICRO)
  39 #define LIBAVCODEC_VERSION      AV_VERSION(LIBAVCODEC_VERSION_MAJOR,    \
  40                                            LIBAVCODEC_VERSION_MINOR,    \
  41                                            LIBAVCODEC_VERSION_MICRO)
  42 #define LIBAVCODEC_BUILD        LIBAVCODEC_VERSION_INT
  43
  44 #define LIBAVCODEC_IDENT        "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
  45
  46 #define AV_NOPTS_VALUE          INT64_C(0x8000000000000000)
  47 #define AV_TIME_BASE            1000000
  48 #define AV_TIME_BASE_Q          (AVRational){1, AV_TIME_BASE}
  49
  50 /**
  51  * Identifies the syntax and semantics of the bitstream.
  52  * The principle is roughly:
  53  * Two decoders with the same ID can decode the same streams.
  54  * Two encoders with the same ID can encode compatible streams.
  55  * There may be slight deviations from the principle due to implementation
  56  * details.
  57  *
  58  * If you add a codec ID to this list, add it so that
  59  * 1. no value of a existing codec ID changes (that would break ABI),
  60  * 2. it is as close as possible to similar codecs.
  61  */
  62 enum CodecID {
  63     CODEC_ID_NONE,
  64
  65     /* video codecs */
  66     CODEC_ID_MPEG1VIDEO,
  67     CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
  68     CODEC_ID_MPEG2VIDEO_XVMC,
  69     CODEC_ID_H261,
  70     CODEC_ID_H263,
  71     CODEC_ID_RV10,
  72     CODEC_ID_RV20,
  73     CODEC_ID_MJPEG,
  74     CODEC_ID_MJPEGB,
  75     CODEC_ID_LJPEG,
  76     CODEC_ID_SP5X,
  77     CODEC_ID_JPEGLS,
  78     CODEC_ID_MPEG4,
  79     CODEC_ID_RAWVIDEO,
  80     CODEC_ID_MSMPEG4V1,
  81     CODEC_ID_MSMPEG4V2,
  82     CODEC_ID_MSMPEG4V3,
  83     CODEC_ID_WMV1,
  84     CODEC_ID_WMV2,
  85     CODEC_ID_H263P,
  86     CODEC_ID_H263I,
  87     CODEC_ID_FLV1,
  88     CODEC_ID_SVQ1,
  89     CODEC_ID_SVQ3,
  90     CODEC_ID_DVVIDEO,
  91     CODEC_ID_HUFFYUV,
  92     CODEC_ID_CYUV,
  93     CODEC_ID_H264,
  94     CODEC_ID_INDEO3,
  95     CODEC_ID_VP3,
  96     CODEC_ID_THEORA,
  97     CODEC_ID_ASV1,
  98     CODEC_ID_ASV2,
  99     CODEC_ID_FFV1,
 100     CODEC_ID_4XM,
 101     CODEC_ID_VCR1,
 102     CODEC_ID_CLJR,
 103     CODEC_ID_MDEC,
 104     CODEC_ID_ROQ,
 105     CODEC_ID_INTERPLAY_VIDEO,
 106     CODEC_ID_XAN_WC3,
 107     CODEC_ID_XAN_WC4,
 108     CODEC_ID_RPZA,
 109     CODEC_ID_CINEPAK,
 110     CODEC_ID_WS_VQA,
 111     CODEC_ID_MSRLE,
 112     CODEC_ID_MSVIDEO1,
 113     CODEC_ID_IDCIN,
 114     CODEC_ID_8BPS,
 115     CODEC_ID_SMC,
 116     CODEC_ID_FLIC,
 117     CODEC_ID_TRUEMOTION1,
 118     CODEC_ID_VMDVIDEO,
 119     CODEC_ID_MSZH,
 120     CODEC_ID_ZLIB,
 121     CODEC_ID_QTRLE,
 122     CODEC_ID_SNOW,
 123     CODEC_ID_TSCC,
 124     CODEC_ID_ULTI,
 125     CODEC_ID_QDRAW,
 126     CODEC_ID_VIXL,
 127     CODEC_ID_QPEG,
 128     CODEC_ID_XVID,
 129     CODEC_ID_PNG,
 130     CODEC_ID_PPM,
 131     CODEC_ID_PBM,
 132     CODEC_ID_PGM,
 133     CODEC_ID_PGMYUV,
 134     CODEC_ID_PAM,
 135     CODEC_ID_FFVHUFF,
 136     CODEC_ID_RV30,
 137     CODEC_ID_RV40,
 138     CODEC_ID_VC1,
 139     CODEC_ID_WMV3,
 140     CODEC_ID_LOCO,
 141     CODEC_ID_WNV1,
 142     CODEC_ID_AASC,
 143     CODEC_ID_INDEO2,
 144     CODEC_ID_FRAPS,
 145     CODEC_ID_TRUEMOTION2,
 146     CODEC_ID_BMP,
 147     CODEC_ID_CSCD,
 148     CODEC_ID_MMVIDEO,
 149     CODEC_ID_ZMBV,
 150     CODEC_ID_AVS,
 151     CODEC_ID_SMACKVIDEO,
 152     CODEC_ID_NUV,
 153     CODEC_ID_KMVC,
 154     CODEC_ID_FLASHSV,
 155     CODEC_ID_CAVS,
 156     CODEC_ID_JPEG2000,
 157     CODEC_ID_VMNC,
 158     CODEC_ID_VP5,
 159     CODEC_ID_VP6,
 160     CODEC_ID_VP6F,
 161     CODEC_ID_TARGA,
 162     CODEC_ID_DSICINVIDEO,
 163     CODEC_ID_TIERTEXSEQVIDEO,
 164     CODEC_ID_TIFF,
 165     CODEC_ID_GIF,
 166     CODEC_ID_FFH264,
 167     CODEC_ID_DXA,
 168     CODEC_ID_DNXHD,
 169     CODEC_ID_THP,
 170     CODEC_ID_SGI,
 171     CODEC_ID_C93,
 172     CODEC_ID_BETHSOFTVID,
 173     CODEC_ID_PTX,
 174     CODEC_ID_TXD,
 175     CODEC_ID_VP6A,
 176     CODEC_ID_AMV,
 177     CODEC_ID_VB,
 178     CODEC_ID_PCX,
 179     CODEC_ID_SUNRAST,
 180     CODEC_ID_INDEO4,
 181     CODEC_ID_INDEO5,
 182     CODEC_ID_MIMIC,
 183     CODEC_ID_RL2,
 184     CODEC_ID_8SVX_EXP,
 185     CODEC_ID_8SVX_FIB,
 186     CODEC_ID_ESCAPE124,
 187     CODEC_ID_DIRAC,
 188     CODEC_ID_BFI,
 189     CODEC_ID_CMV,
 190     CODEC_ID_MOTIONPIXELS,
 191     CODEC_ID_TGV,
 192     CODEC_ID_TGQ,
 193     CODEC_ID_TQI,
 194     CODEC_ID_AURA,
 195     CODEC_ID_AURA2,
 196     CODEC_ID_V210X,
 197     CODEC_ID_TMV,
 198     CODEC_ID_V210,
 199     CODEC_ID_DPX,
 200     CODEC_ID_MAD,
 201     CODEC_ID_FRWU,
 202     CODEC_ID_FLASHSV2,
 203     CODEC_ID_CDGRAPHICS,
 204     CODEC_ID_R210,
 205     CODEC_ID_ANM,
 206     CODEC_ID_BINKVIDEO,
 207     CODEC_ID_IFF_ILBM,
 208     CODEC_ID_IFF_BYTERUN1,
 209
 210     /* various PCM "codecs" */
 211     CODEC_ID_PCM_S16LE= 0x10000,
 212     CODEC_ID_PCM_S16BE,
 213     CODEC_ID_PCM_U16LE,
 214     CODEC_ID_PCM_U16BE,
 215     CODEC_ID_PCM_S8,
 216     CODEC_ID_PCM_U8,
 217     CODEC_ID_PCM_MULAW,
 218     CODEC_ID_PCM_ALAW,
 219     CODEC_ID_PCM_S32LE,
 220     CODEC_ID_PCM_S32BE,
 221     CODEC_ID_PCM_U32LE,
 222     CODEC_ID_PCM_U32BE,
 223     CODEC_ID_PCM_S24LE,
 224     CODEC_ID_PCM_S24BE,
 225     CODEC_ID_PCM_U24LE,
 226     CODEC_ID_PCM_U24BE,
 227     CODEC_ID_PCM_S24DAUD,
 228     CODEC_ID_PCM_ZORK,
 229     CODEC_ID_PCM_S16LE_PLANAR,
 230     CODEC_ID_PCM_DVD,
 231     CODEC_ID_PCM_F32BE,
 232     CODEC_ID_PCM_F32LE,
 233     CODEC_ID_PCM_F64BE,
 234     CODEC_ID_PCM_F64LE,
 235     CODEC_ID_PCM_BLURAY,
 236
 237     /* various ADPCM codecs */
 238     CODEC_ID_ADPCM_IMA_QT= 0x11000,
 239     CODEC_ID_ADPCM_IMA_WAV,
 240     CODEC_ID_ADPCM_IMA_DK3,
 241     CODEC_ID_ADPCM_IMA_DK4,
 242     CODEC_ID_ADPCM_IMA_WS,
 243     CODEC_ID_ADPCM_IMA_SMJPEG,
 244     CODEC_ID_ADPCM_MS,
 245     CODEC_ID_ADPCM_4XM,
 246     CODEC_ID_ADPCM_XA,
 247     CODEC_ID_ADPCM_ADX,
 248     CODEC_ID_ADPCM_EA,
 249     CODEC_ID_ADPCM_G726,
 250     CODEC_ID_ADPCM_CT,
 251     CODEC_ID_ADPCM_SWF,
 252     CODEC_ID_ADPCM_YAMAHA,
 253     CODEC_ID_ADPCM_SBPRO_4,
 254     CODEC_ID_ADPCM_SBPRO_3,
 255     CODEC_ID_ADPCM_SBPRO_2,
 256     CODEC_ID_ADPCM_THP,
 257     CODEC_ID_ADPCM_IMA_AMV,
 258     CODEC_ID_ADPCM_EA_R1,
 259     CODEC_ID_ADPCM_EA_R3,
 260     CODEC_ID_ADPCM_EA_R2,
 261     CODEC_ID_ADPCM_IMA_EA_SEAD,
 262     CODEC_ID_ADPCM_IMA_EA_EACS,
 263     CODEC_ID_ADPCM_EA_XAS,
 264     CODEC_ID_ADPCM_EA_MAXIS_XA,
 265     CODEC_ID_ADPCM_IMA_ISS,
 266
 267     /* AMR */
 268     CODEC_ID_AMR_NB= 0x12000,
 269     CODEC_ID_AMR_WB,
 270
 271     /* RealAudio codecs*/
 272     CODEC_ID_RA_144= 0x13000,
 273     CODEC_ID_RA_288,
 274
 275     /* various DPCM codecs */
 276     CODEC_ID_ROQ_DPCM= 0x14000,
 277     CODEC_ID_INTERPLAY_DPCM,
 278     CODEC_ID_XAN_DPCM,
 279     CODEC_ID_SOL_DPCM,
 280
 281     /* audio codecs */
 282     CODEC_ID_MP2= 0x15000,
 283     CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
 284     CODEC_ID_AAC,
 285     CODEC_ID_AC3,
 286     CODEC_ID_DTS,
 287     CODEC_ID_VORBIS,
 288     CODEC_ID_DVAUDIO,
 289     CODEC_ID_WMAV1,
 290     CODEC_ID_WMAV2,
 291     CODEC_ID_MACE3,
 292     CODEC_ID_MACE6,
 293     CODEC_ID_VMDAUDIO,
 294     CODEC_ID_SONIC,
 295     CODEC_ID_SONIC_LS,
 296     CODEC_ID_FLAC,
 297     CODEC_ID_MP3ADU,
 298     CODEC_ID_MP3ON4,
 299     CODEC_ID_SHORTEN,
 300     CODEC_ID_ALAC,
 301     CODEC_ID_WESTWOOD_SND1,
 302     CODEC_ID_GSM, ///< as in Berlin toast format
 303     CODEC_ID_QDM2,
 304     CODEC_ID_COOK,
 305     CODEC_ID_TRUESPEECH,
 306     CODEC_ID_TTA,
 307     CODEC_ID_SMACKAUDIO,
 308     CODEC_ID_QCELP,
 309     CODEC_ID_WAVPACK,
 310     CODEC_ID_DSICINAUDIO,
 311     CODEC_ID_IMC,
 312     CODEC_ID_MUSEPACK7,
 313     CODEC_ID_MLP,
 314     CODEC_ID_GSM_MS, /* as found in WAV */
 315     CODEC_ID_ATRAC3,
 316     CODEC_ID_VOXWARE,
 317     CODEC_ID_APE,
 318     CODEC_ID_NELLYMOSER,
 319     CODEC_ID_MUSEPACK8,
 320     CODEC_ID_SPEEX,
 321     CODEC_ID_WMAVOICE,
 322     CODEC_ID_WMAPRO,
 323     CODEC_ID_WMALOSSLESS,
 324     CODEC_ID_ATRAC3P,
 325     CODEC_ID_EAC3,
 326     CODEC_ID_SIPR,
 327     CODEC_ID_MP1,
 328     CODEC_ID_TWINVQ,
 329     CODEC_ID_TRUEHD,
 330     CODEC_ID_MP4ALS,
 331     CODEC_ID_ATRAC1,
 332     CODEC_ID_BINKAUDIO_RDFT,
 333     CODEC_ID_BINKAUDIO_DCT,
 334
 335     /* subtitle codecs */
 336     CODEC_ID_DVD_SUBTITLE= 0x17000,
 337     CODEC_ID_DVB_SUBTITLE,
 338     CODEC_ID_TEXT,  ///< raw UTF-8 text
 339     CODEC_ID_XSUB,
 340     CODEC_ID_SSA,
 341     CODEC_ID_MOV_TEXT,
 342     CODEC_ID_HDMV_PGS_SUBTITLE,
 343     CODEC_ID_DVB_TELETEXT,
 344
 345     /* other specific kind of codecs (generally used for attachments) */
 346     CODEC_ID_TTF= 0x18000,
 347
 348     CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
 349
 350     CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
 351                                 * stream (only used by libavformat) */
 352 };
 353
 354 enum CodecType {
 355     CODEC_TYPE_UNKNOWN = -1,
 356     CODEC_TYPE_VIDEO,
 357     CODEC_TYPE_AUDIO,
 358     CODEC_TYPE_DATA,
 359     CODEC_TYPE_SUBTITLE,
 360     CODEC_TYPE_ATTACHMENT,
 361     CODEC_TYPE_NB
 362 };
 363
 364 /**
 365  * all in native-endian format
 366  */
 367 enum SampleFormat {
 368     SAMPLE_FMT_NONE = -1,
 369     SAMPLE_FMT_U8,              ///< unsigned 8 bits
 370     SAMPLE_FMT_S16,             ///< signed 16 bits
 371     SAMPLE_FMT_S32,             ///< signed 32 bits
 372     SAMPLE_FMT_FLT,             ///< float
 373     SAMPLE_FMT_DBL,             ///< double
 374     SAMPLE_FMT_NB               ///< Number of sample formats. DO NOT USE if dynamically linking to libavcodec
 375 };
 376
 377 /* Audio channel masks */
 378 #define CH_FRONT_LEFT             0x00000001
 379 #define CH_FRONT_RIGHT            0x00000002
 380 #define CH_FRONT_CENTER           0x00000004
 381 #define CH_LOW_FREQUENCY          0x00000008
 382 #define CH_BACK_LEFT              0x00000010
 383 #define CH_BACK_RIGHT             0x00000020
 384 #define CH_FRONT_LEFT_OF_CENTER   0x00000040
 385 #define CH_FRONT_RIGHT_OF_CENTER  0x00000080
 386 #define CH_BACK_CENTER            0x00000100
 387 #define CH_SIDE_LEFT              0x00000200
 388 #define CH_SIDE_RIGHT             0x00000400
 389 #define CH_TOP_CENTER             0x00000800
 390 #define CH_TOP_FRONT_LEFT         0x00001000
 391 #define CH_TOP_FRONT_CENTER       0x00002000
 392 #define CH_TOP_FRONT_RIGHT        0x00004000
 393 #define CH_TOP_BACK_LEFT          0x00008000
 394 #define CH_TOP_BACK_CENTER        0x00010000
 395 #define CH_TOP_BACK_RIGHT         0x00020000
 396 #define CH_STEREO_LEFT            0x20000000  ///< Stereo downmix.
 397 #define CH_STEREO_RIGHT           0x40000000  ///< See CH_STEREO_LEFT.
 398
 399 /** Channel mask value used for AVCodecContext.request_channel_layout
 400     to indicate that the user requests the channel order of the decoder output
 401     to be the native codec channel order. */
 402 #define CH_LAYOUT_NATIVE          0x8000000000000000LL
 403
 404 /* Audio channel convenience macros */
 405 #define CH_LAYOUT_MONO              (CH_FRONT_CENTER)
 406 #define CH_LAYOUT_STEREO            (CH_FRONT_LEFT|CH_FRONT_RIGHT)
 407 #define CH_LAYOUT_2_1               (CH_LAYOUT_STEREO|CH_BACK_CENTER)
 408 #define CH_LAYOUT_SURROUND          (CH_LAYOUT_STEREO|CH_FRONT_CENTER)
 409 #define CH_LAYOUT_4POINT0           (CH_LAYOUT_SURROUND|CH_BACK_CENTER)
 410 #define CH_LAYOUT_2_2               (CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT)
 411 #define CH_LAYOUT_QUAD              (CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT)
 412 #define CH_LAYOUT_5POINT0           (CH_LAYOUT_SURROUND|CH_SIDE_LEFT|CH_SIDE_RIGHT)
 413 #define CH_LAYOUT_5POINT1           (CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY)
 414 #define CH_LAYOUT_5POINT0_BACK      (CH_LAYOUT_SURROUND|CH_BACK_LEFT|CH_BACK_RIGHT)
 415 #define CH_LAYOUT_5POINT1_BACK      (CH_LAYOUT_5POINT0_BACK|CH_LOW_FREQUENCY)
 416 #define CH_LAYOUT_7POINT0           (CH_LAYOUT_5POINT0|CH_BACK_LEFT|CH_BACK_RIGHT)
 417 #define CH_LAYOUT_7POINT1           (CH_LAYOUT_5POINT1|CH_BACK_LEFT|CH_BACK_RIGHT)
 418 #define CH_LAYOUT_7POINT1_WIDE      (CH_LAYOUT_5POINT1_BACK|\
 419                                           CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER)
 420 #define CH_LAYOUT_STEREO_DOWNMIX    (CH_STEREO_LEFT|CH_STEREO_RIGHT)
 421
 422 /* in bytes */
 423 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
 424
 425 /**
 426  * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
 427  * This is mainly needed because some optimized bitstream readers read
 428  * 32 or 64 bit at once and could read over the end.<br>
 429  * Note: If the first 23 bits of the additional bytes are not 0, then damaged
 430  * MPEG bitstreams could cause overread and segfault.
 431  */
 432 #define FF_INPUT_BUFFER_PADDING_SIZE 8
 433
 434 /**
 435  * minimum encoding buffer size
 436  * Used to avoid some checks during header writing.
 437  */
 438 #define FF_MIN_BUFFER_SIZE 16384
 439
 440
 441 /**
 442  * motion estimation type.
 443  */
 444 enum Motion_Est_ID {
 445     ME_ZERO = 1,    ///< no search, that is use 0,0 vector whenever one is needed
 446     ME_FULL,
 447     ME_LOG,
 448     ME_PHODS,
 449     ME_EPZS,        ///< enhanced predictive zonal search
 450     ME_X1,          ///< reserved for experiments
 451     ME_HEX,         ///< hexagon based search
 452     ME_UMH,         ///< uneven multi-hexagon search
 453     ME_ITER,        ///< iterative search
 454     ME_TESA,        ///< transformed exhaustive search algorithm
 455 };
 456
 457 enum AVDiscard{
 458     /* We leave some space between them for extensions (drop some
 459      * keyframes for intra-only or drop just some bidir frames). */
 460     AVDISCARD_NONE   =-16, ///< discard nothing
 461     AVDISCARD_DEFAULT=  0, ///< discard useless packets like 0 size packets in avi
 462     AVDISCARD_NONREF =  8, ///< discard all non reference
 463     AVDISCARD_BIDIR  = 16, ///< discard all bidirectional frames
 464     AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
 465     AVDISCARD_ALL    = 48, ///< discard all
 466 };
 467
 468 enum AVColorPrimaries{
 469     AVCOL_PRI_BT709      =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
 470     AVCOL_PRI_UNSPECIFIED=2,
 471     AVCOL_PRI_BT470M     =4,
 472     AVCOL_PRI_BT470BG    =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
 473     AVCOL_PRI_SMPTE170M  =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
 474     AVCOL_PRI_SMPTE240M  =7, ///< functionally identical to above
 475     AVCOL_PRI_FILM       =8,
 476     AVCOL_PRI_NB           , ///< Not part of ABI
 477 };
 478
 479 enum AVColorTransferCharacteristic{
 480     AVCOL_TRC_BT709      =1, ///< also ITU-R BT1361
 481     AVCOL_TRC_UNSPECIFIED=2,
 482     AVCOL_TRC_GAMMA22    =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
 483     AVCOL_TRC_GAMMA28    =5, ///< also ITU-R BT470BG
 484     AVCOL_TRC_NB           , ///< Not part of ABI
 485 };
 486
 487 enum AVColorSpace{
 488     AVCOL_SPC_RGB        =0,
 489     AVCOL_SPC_BT709      =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
 490     AVCOL_SPC_UNSPECIFIED=2,
 491     AVCOL_SPC_FCC        =4,
 492     AVCOL_SPC_BT470BG    =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
 493     AVCOL_SPC_SMPTE170M  =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
 494     AVCOL_SPC_SMPTE240M  =7,
 495     AVCOL_SPC_NB           , ///< Not part of ABI
 496 };
 497
 498 enum AVColorRange{
 499     AVCOL_RANGE_UNSPECIFIED=0,
 500     AVCOL_RANGE_MPEG       =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
 501     AVCOL_RANGE_JPEG       =2, ///< the normal     2^n-1   "JPEG" YUV ranges
 502     AVCOL_RANGE_NB           , ///< Not part of ABI
 503 };
 504
 505 /**
 506  *  X   X      3 4 X      X are luma samples,
 507  *             1 2        1-6 are possible chroma positions
 508  *  X   X      5 6 X      0 is undefined/unknown position
 509  */
 510 enum AVChromaLocation{
 511     AVCHROMA_LOC_UNSPECIFIED=0,
 512     AVCHROMA_LOC_LEFT       =1, ///< mpeg2/4, h264 default
 513     AVCHROMA_LOC_CENTER     =2, ///< mpeg1, jpeg, h263
 514     AVCHROMA_LOC_TOPLEFT    =3, ///< DV
 515     AVCHROMA_LOC_TOP        =4,
 516     AVCHROMA_LOC_BOTTOMLEFT =5,
 517     AVCHROMA_LOC_BOTTOM     =6,
 518     AVCHROMA_LOC_NB           , ///< Not part of ABI
 519 };
 520
 521 typedef struct RcOverride{
 522     int start_frame;
 523     int end_frame;
 524     int qscale; // If this is 0 then quality_factor will be used instead.
 525     float quality_factor;
 526 } RcOverride;
 527
 528 #define FF_MAX_B_FRAMES 16
 529
 530 /* encoding support
 531    These flags can be passed in AVCodecContext.flags before initialization.
 532    Note: Not everything is supported yet.
 533 */
 534
 535 #define CODEC_FLAG_QSCALE 0x0002  ///< Use fixed qscale.
 536 #define CODEC_FLAG_4MV    0x0004  ///< 4 MV per MB allowed / advanced prediction for H.263.
 537 #define CODEC_FLAG_QPEL   0x0010  ///< Use qpel MC.
 538 #define CODEC_FLAG_GMC    0x0020  ///< Use GMC.
 539 #define CODEC_FLAG_MV0    0x0040  ///< Always try a MB with MV=<0,0>.
 540 #define CODEC_FLAG_PART   0x0080  ///< Use data partitioning.
 541 /**
 542  * The parent program guarantees that the input for B-frames containing
 543  * streams is not written to for at least s->max_b_frames+1 frames, if
 544  * this is not set the input will be copied.
 545  */
 546 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
 547 #define CODEC_FLAG_PASS1           0x0200   ///< Use internal 2pass ratecontrol in first pass mode.
 548 #define CODEC_FLAG_PASS2           0x0400   ///< Use internal 2pass ratecontrol in second pass mode.
 549 #define CODEC_FLAG_EXTERN_HUFF     0x1000   ///< Use external Huffman table (for MJPEG).
 550 #define CODEC_FLAG_GRAY            0x2000   ///< Only decode/encode grayscale.
 551 #define CODEC_FLAG_EMU_EDGE        0x4000   ///< Don't draw edges.
 552 #define CODEC_FLAG_PSNR            0x8000   ///< error[?] variables will be set during encoding.
 553 #define CODEC_FLAG_TRUNCATED       0x00010000 /** Input bitstream might be truncated at a random
 554                                                   location instead of only at frame boundaries. */
 555 #define CODEC_FLAG_NORMALIZE_AQP  0x00020000 ///< Normalize adaptive quantization.
 556 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
 557 #define CODEC_FLAG_LOW_DELAY      0x00080000 ///< Force low delay.
 558 #define CODEC_FLAG_ALT_SCAN       0x00100000 ///< Use alternate scan.
 559 #define CODEC_FLAG_GLOBAL_HEADER  0x00400000 ///< Place global headers in extradata instead of every keyframe.
 560 #define CODEC_FLAG_BITEXACT       0x00800000 ///< Use only bitexact stuff (except (I)DCT).
 561 /* Fx : Flag for h263+ extra options */
 562 #define CODEC_FLAG_AC_PRED        0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
 563 #define CODEC_FLAG_H263P_UMV      0x02000000 ///< unlimited motion vector
 564 #define CODEC_FLAG_CBP_RD         0x04000000 ///< Use rate distortion optimization for cbp.
 565 #define CODEC_FLAG_QP_RD          0x08000000 ///< Use rate distortion optimization for qp selectioon.
 566 #define CODEC_FLAG_H263P_AIV      0x00000008 ///< H.263 alternative inter VLC
 567 #define CODEC_FLAG_OBMC           0x00000001 ///< OBMC
 568 #define CODEC_FLAG_LOOP_FILTER    0x00000800 ///< loop filter
 569 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
 570 #define CODEC_FLAG_INTERLACED_ME  0x20000000 ///< interlaced motion estimation
 571 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
 572 #define CODEC_FLAG_CLOSED_GOP     0x80000000
 573 #define CODEC_FLAG2_FAST          0x00000001 ///< Allow non spec compliant speedup tricks.
 574 #define CODEC_FLAG2_STRICT_GOP    0x00000002 ///< Strictly enforce GOP size.
 575 #define CODEC_FLAG2_NO_OUTPUT     0x00000004 ///< Skip bitstream encoding.
 576 #define CODEC_FLAG2_LOCAL_HEADER  0x00000008 ///< Place global headers at every keyframe instead of in extradata.
 577 #define CODEC_FLAG2_BPYRAMID      0x00000010 ///< H.264 allow B-frames to be used as references.
 578 #define CODEC_FLAG2_WPRED         0x00000020 ///< H.264 weighted biprediction for B-frames
 579 #define CODEC_FLAG2_MIXED_REFS    0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
 580 #define CODEC_FLAG2_8X8DCT        0x00000080 ///< H.264 high profile 8x8 transform
 581 #define CODEC_FLAG2_FASTPSKIP     0x00000100 ///< H.264 fast pskip
 582 #define CODEC_FLAG2_AUD           0x00000200 ///< H.264 access unit delimiters
 583 #define CODEC_FLAG2_BRDO          0x00000400 ///< B-frame rate-distortion optimization
 584 #define CODEC_FLAG2_INTRA_VLC     0x00000800 ///< Use MPEG-2 intra VLC table.
 585 #define CODEC_FLAG2_MEMC_ONLY     0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
 586 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
 587 #define CODEC_FLAG2_SKIP_RD       0x00004000 ///< RD optimal MB level residual skipping
 588 #define CODEC_FLAG2_CHUNKS        0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
 589 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
 590 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
 591 #define CODEC_FLAG2_MBTREE        0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
 592
 593 /* Unsupported options :
 594  *              Syntax Arithmetic coding (SAC)
 595  *              Reference Picture Selection
 596  *              Independent Segment Decoding */
 597 /* /Fx */
 598 /* codec capabilities */
 599
 600 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
 601 /**
 602  * Codec uses get_buffer() for allocating buffers.
 603  * direct rendering method 1
 604  */
 605 #define CODEC_CAP_DR1             0x0002
 606 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
 607 #define CODEC_CAP_PARSE_ONLY      0x0004
 608 #define CODEC_CAP_TRUNCATED       0x0008
 609 /* Codec can export data for HW decoding (XvMC). */
 610 #define CODEC_CAP_HWACCEL         0x0010
 611 /**
 612  * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
 613  * If this is not set, the codec is guaranteed to never be fed with NULL data.
 614  */
 615 #define CODEC_CAP_DELAY           0x0020
 616 /**
 617  * Codec can be fed a final frame with a smaller size.
 618  * This can be used to prevent truncation of the last audio samples.
 619  */
 620 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
 621 /**
 622  * Codec can export data for HW decoding (VDPAU).
 623  */
 624 #define CODEC_CAP_HWACCEL_VDPAU    0x0080
 625 /**
 626  * Codec can output multiple frames per AVPacket
 627  * Normally demuxers return one frame at a time, demuxers which do not do
 628  * are connected to a parser to split what they return into proper frames.
 629  * This flag is reserved to the very rare category of codecs which have a
 630  * bitstream that cannot be split into frames without timeconsuming
 631  * operations like full decoding. Demuxers carring such bitstreams thus
 632  * may return multiple frames in a packet. This has many disadvantages like
 633  * prohibiting stream copy in many cases thus it should only be considered
 634  * as a last resort.
 635  */
 636 #define CODEC_CAP_SUBFRAMES        0x0100
 637
 638 //The following defines may change, don't expect compatibility if you use them.
 639 #define MB_TYPE_INTRA4x4   0x0001
 640 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
 641 #define MB_TYPE_INTRA_PCM  0x0004 //FIXME H.264-specific
 642 #define MB_TYPE_16x16      0x0008
 643 #define MB_TYPE_16x8       0x0010
 644 #define MB_TYPE_8x16       0x0020
 645 #define MB_TYPE_8x8        0x0040
 646 #define MB_TYPE_INTERLACED 0x0080
 647 #define MB_TYPE_DIRECT2    0x0100 //FIXME
 648 #define MB_TYPE_ACPRED     0x0200
 649 #define MB_TYPE_GMC        0x0400
 650 #define MB_TYPE_SKIP       0x0800
 651 #define MB_TYPE_P0L0       0x1000
 652 #define MB_TYPE_P1L0       0x2000
 653 #define MB_TYPE_P0L1       0x4000
 654 #define MB_TYPE_P1L1       0x8000
 655 #define MB_TYPE_L0         (MB_TYPE_P0L0 | MB_TYPE_P1L0)
 656 #define MB_TYPE_L1         (MB_TYPE_P0L1 | MB_TYPE_P1L1)
 657 #define MB_TYPE_L0L1       (MB_TYPE_L0   | MB_TYPE_L1)
 658 #define MB_TYPE_QUANT      0x00010000
 659 #define MB_TYPE_CBP        0x00020000
 660 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
 661
 662 /**
 663  * Pan Scan area.
 664  * This specifies the area which should be displayed.
 665  * Note there may be multiple such areas for one frame.
 666  */
 667 typedef struct AVPanScan{
 668     /**
 669      * id
 670      * - encoding: Set by user.
 671      * - decoding: Set by libavcodec.
 672      */
 673     int id;
 674
 675     /**
 676      * width and height in 1/16 pel
 677      * - encoding: Set by user.
 678      * - decoding: Set by libavcodec.
 679      */
 680     int width;
 681     int height;
 682
 683     /**
 684      * position of the top left corner in 1/16 pel for up to 3 fields/frames
 685      * - encoding: Set by user.
 686      * - decoding: Set by libavcodec.
 687      */
 688     int16_t position[3][2];
 689 }AVPanScan;
 690
 691 #define FF_COMMON_FRAME \
 692     /**\
 693      * pointer to the picture planes.\
 694      * This might be different from the first allocated byte\
 695      * - encoding: \
 696      * - decoding: \
 697      */\
 698     uint8_t *data[4];\
 699     int linesize[4];\
 700     /**\
 701      * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
 702      * This isn't used by libavcodec unless the default get/release_buffer() is used.\
 703      * - encoding: \
 704      * - decoding: \
 705      */\
 706     uint8_t *base[4];\
 707     /**\
 708      * 1 -> keyframe, 0-> not\
 709      * - encoding: Set by libavcodec.\
 710      * - decoding: Set by libavcodec.\
 711      */\
 712     int key_frame;\
 713 \
 714     /**\
 715      * Picture type of the frame, see ?_TYPE below.\
 716      * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
 717      * - decoding: Set by libavcodec.\
 718      */\
 719     int pict_type;\
 720 \
 721     /**\
 722      * presentation timestamp in time_base units (time when frame should be shown to user)\
 723      * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
 724      * - encoding: MUST be set by user.\
 725      * - decoding: Set by libavcodec.\
 726      */\
 727     int64_t pts;\
 728 \
 729     /**\
 730      * picture number in bitstream order\
 731      * - encoding: set by\
 732      * - decoding: Set by libavcodec.\
 733      */\
 734     int coded_picture_number;\
 735     /**\
 736      * picture number in display order\
 737      * - encoding: set by\
 738      * - decoding: Set by libavcodec.\
 739      */\
 740     int display_picture_number;\
 741 \
 742     /**\
 743      * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
 744      * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
 745      * - decoding: Set by libavcodec.\
 746      */\
 747     int quality; \
 748 \
 749     /**\
 750      * buffer age (1->was last buffer and dint change, 2->..., ...).\
 751      * Set to INT_MAX if the buffer has not been used yet.\
 752      * - encoding: unused\
 753      * - decoding: MUST be set by get_buffer().\
 754      */\
 755     int age;\
 756 \
 757     /**\
 758      * is this picture used as reference\
 759      * The values for this are the same as the MpegEncContext.picture_structure\
 760      * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
 761      * Set to 4 for delayed, non-reference frames.\
 762      * - encoding: unused\
 763      * - decoding: Set by libavcodec. (before get_buffer() call)).\
 764      */\
 765     int reference;\
 766 \
 767     /**\
 768      * QP table\
 769      * - encoding: unused\
 770      * - decoding: Set by libavcodec.\
 771      */\
 772     int8_t *qscale_table;\
 773     /**\
 774      * QP store stride\
 775      * - encoding: unused\
 776      * - decoding: Set by libavcodec.\
 777      */\
 778     int qstride;\
 779 \
 780     /**\
 781      * mbskip_table[mb]>=1 if MB didn't change\
 782      * stride= mb_width = (width+15)>>4\
 783      * - encoding: unused\
 784      * - decoding: Set by libavcodec.\
 785      */\
 786     uint8_t *mbskip_table;\
 787 \
 788     /**\
 789      * motion vector table\
 790      * @code\
 791      * example:\
 792      * int mv_sample_log2= 4 - motion_subsample_log2;\
 793      * int mb_width= (width+15)>>4;\
 794      * int mv_stride= (mb_width << mv_sample_log2) + 1;\
 795      * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
 796      * @endcode\
 797      * - encoding: Set by user.\
 798      * - decoding: Set by libavcodec.\
 799      */\
 800     int16_t (*motion_val[2])[2];\
 801 \
 802     /**\
 803      * macroblock type table\
 804      * mb_type_base + mb_width + 2\
 805      * - encoding: Set by user.\
 806      * - decoding: Set by libavcodec.\
 807      */\
 808     uint32_t *mb_type;\
 809 \
 810     /**\
 811      * log2 of the size of the block which a single vector in motion_val represents: \
 812      * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
 813      * - encoding: unused\
 814      * - decoding: Set by libavcodec.\
 815      */\
 816     uint8_t motion_subsample_log2;\
 817 \
 818     /**\
 819      * for some private data of the user\
 820      * - encoding: unused\
 821      * - decoding: Set by user.\
 822      */\
 823     void *opaque;\
 824 \
 825     /**\
 826      * error\
 827      * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
 828      * - decoding: unused\
 829      */\
 830     uint64_t error[4];\
 831 \
 832     /**\
 833      * type of the buffer (to keep track of who has to deallocate data[*])\
 834      * - encoding: Set by the one who allocates it.\
 835      * - decoding: Set by the one who allocates it.\
 836      * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
 837      */\
 838     int type;\
 839     \
 840     /**\
 841      * When decoding, this signals how much the picture must be delayed.\
 842      * extra_delay = repeat_pict / (2*fps)\
 843      * - encoding: unused\
 844      * - decoding: Set by libavcodec.\
 845      */\
 846     int repeat_pict;\
 847     \
 848     /**\
 849      * \
 850      */\
 851     int qscale_type;\
 852     \
 853     /**\
 854      * The content of the picture is interlaced.\
 855      * - encoding: Set by user.\
 856      * - decoding: Set by libavcodec. (default 0)\
 857      */\
 858     int interlaced_frame;\
 859     \
 860     /**\
 861      * If the content is interlaced, is top field displayed first.\
 862      * - encoding: Set by user.\
 863      * - decoding: Set by libavcodec.\
 864      */\
 865     int top_field_first;\
 866     \
 867     /**\
 868      * Pan scan.\
 869      * - encoding: Set by user.\
 870      * - decoding: Set by libavcodec.\
 871      */\
 872     AVPanScan *pan_scan;\
 873     \
 874     /**\
 875      * Tell user application that palette has changed from previous frame.\
 876      * - encoding: ??? (no palette-enabled encoder yet)\
 877      * - decoding: Set by libavcodec. (default 0).\
 878      */\
 879     int palette_has_changed;\
 880     \
 881     /**\
 882      * codec suggestion on buffer type if != 0\
 883      * - encoding: unused\
 884      * - decoding: Set by libavcodec. (before get_buffer() call)).\
 885      */\
 886     int buffer_hints;\
 887 \
 888     /**\
 889      * DCT coefficients\
 890      * - encoding: unused\
 891      * - decoding: Set by libavcodec.\
 892      */\
 893     short *dct_coeff;\
 894 \
 895     /**\
 896      * motion referece frame index\
 897      * - encoding: Set by user.\
 898      * - decoding: Set by libavcodec.\
 899      */\
 900     int8_t *ref_index[2];\
 901 \
 902     /**\
 903      * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque\
 904      * output in AVFrame.reordered_opaque\
 905      * - encoding: unused\
 906      * - decoding: Read by user.\
 907      */\
 908     int64_t reordered_opaque;\
 909 \
 910     /**\
 911      * hardware accelerator private data (FFmpeg allocated)\
 912      * - encoding: unused\
 913      * - decoding: Set by libavcodec\
 914      */\
 915     void *hwaccel_picture_private;\
 916
 917
 918 #define FF_QSCALE_TYPE_MPEG1 0
 919 #define FF_QSCALE_TYPE_MPEG2 1
 920 #define FF_QSCALE_TYPE_H264  2
 921 #define FF_QSCALE_TYPE_VP56  3
 922
 923 #define FF_BUFFER_TYPE_INTERNAL 1
 924 #define FF_BUFFER_TYPE_USER     2 ///< direct rendering buffers (image is (de)allocated by user)
 925 #define FF_BUFFER_TYPE_SHARED   4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
 926 #define FF_BUFFER_TYPE_COPY     8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
 927
 928
 929 #define FF_I_TYPE  1 ///< Intra
 930 #define FF_P_TYPE  2 ///< Predicted
 931 #define FF_B_TYPE  3 ///< Bi-dir predicted
 932 #define FF_S_TYPE  4 ///< S(GMC)-VOP MPEG4
 933 #define FF_SI_TYPE 5 ///< Switching Intra
 934 #define FF_SP_TYPE 6 ///< Switching Predicted
 935 #define FF_BI_TYPE 7
 936
 937 #define FF_BUFFER_HINTS_VALID    0x01 // Buffer hints value is meaningful (if 0 ignore).
 938 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
 939 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
 940 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
 941
 942 typedef struct AVPacket {
 943     /**
 944      * Presentation timestamp in AVStream->time_base units; the time at which
 945      * the decompressed packet will be presented to the user.
 946      * Can be AV_NOPTS_VALUE if it is not stored in the file.
 947      * pts MUST be larger or equal to dts as presentation cannot happen before
 948      * decompression, unless one wants to view hex dumps. Some formats misuse
 949      * the terms dts and pts/cts to mean something different. Such timestamps
 950      * must be converted to true pts/dts before they are stored in AVPacket.
 951      */
 952     int64_t pts;
 953     /**
 954      * Decompression timestamp in AVStream->time_base units; the time at which
 955      * the packet is decompressed.
 956      * Can be AV_NOPTS_VALUE if it is not stored in the file.
 957      */
 958     int64_t dts;
 959     uint8_t *data;
 960     int   size;
 961     int   stream_index;
 962     int   flags;
 963     /**
 964      * Duration of this packet in AVStream->time_base units, 0 if unknown.
 965      * Equals next_pts - this_pts in presentation order.
 966      */
 967     int   duration;
 968     void  (*destruct)(struct AVPacket *);
 969     void  *priv;
 970     int64_t pos;                            ///< byte position in stream, -1 if unknown
 971
 972     /**
 973      * Time difference in AVStream->time_base units from the pts of this
 974      * packet to the point at which the output from the decoder has converged
 975      * independent from the availability of previous frames. That is, the
 976      * frames are virtually identical no matter if decoding started from
 977      * the very first frame or from this keyframe.
 978      * Is AV_NOPTS_VALUE if unknown.
 979      * This field is not the display duration of the current packet.
 980      *
 981      * The purpose of this field is to allow seeking in streams that have no
 982      * keyframes in the conventional sense. It corresponds to the
 983      * recovery point SEI in H.264 and match_time_delta in NUT. It is also
 984      * essential for some types of subtitle streams to ensure that all
 985      * subtitles are correctly displayed after seeking.
 986      */
 987     int64_t convergence_duration;
 988 } AVPacket;
 989 #define AV_PKT_FLAG_KEY   0x0001
 990 #if LIBAVCODEC_VERSION_MAJOR < 53
 991 #define PKT_FLAG_KEY AV_PKT_FLAG_KEY
 992 #endif
 993
 994 /**
 995  * Audio Video Frame.
 996  * New fields can be added to the end of FF_COMMON_FRAME with minor version
 997  * bumps.
 998  * Removal, reordering and changes to existing fields require a major
 999  * version bump. No fields should be added into AVFrame before or after
1000  * FF_COMMON_FRAME!
1001  * sizeof(AVFrame) must not be used outside libav*.
1002  */
1003 typedef struct AVFrame {
1004     FF_COMMON_FRAME
1005 } AVFrame;
1006
1007 /**
1008  * main external API structure.
1009  * New fields can be added to the end with minor version bumps.
1010  * Removal, reordering and changes to existing fields require a major
1011  * version bump.
1012  * sizeof(AVCodecContext) must not be used outside libav*.
1013  */
1014 typedef struct AVCodecContext {
1015     /**
1016      * information on struct for av_log
1017      * - set by avcodec_alloc_context
1018      */
1019     const AVClass *av_class;
1020     /**
1021      * the average bitrate
1022      * - encoding: Set by user; unused for constant quantizer encoding.
1023      * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1024      */
1025     int bit_rate;
1026
1027     /**
1028      * number of bits the bitstream is allowed to diverge from the reference.
1029      *           the reference can be CBR (for CBR pass1) or VBR (for pass2)
1030      * - encoding: Set by user; unused for constant quantizer encoding.
1031      * - decoding: unused
1032      */
1033     int bit_rate_tolerance;
1034
1035     /**
1036      * CODEC_FLAG_*.
1037      * - encoding: Set by user.
1038      * - decoding: Set by user.
1039      */
1040     int flags;
1041
1042     /**
1043      * Some codecs need additional format info. It is stored here.
1044      * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1045      * specific codec MUST set it correctly otherwise stream copy breaks.
1046      * In general use of this field by muxers is not recommanded.
1047      * - encoding: Set by libavcodec.
1048      * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1049      */
1050     int sub_id;
1051
1052     /**
1053      * Motion estimation algorithm used for video coding.
1054      * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1055      * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1056      * - encoding: MUST be set by user.
1057      * - decoding: unused
1058      */
1059     int me_method;
1060
1061     /**
1062      * some codecs need / can use extradata like Huffman tables.
1063      * mjpeg: Huffman tables
1064      * rv10: additional flags
1065      * mpeg4: global headers (they can be in the bitstream or here)
1066      * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1067      * than extradata_size to avoid prolems if it is read with the bitstream reader.
1068      * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1069      * - encoding: Set/allocated/freed by libavcodec.
1070      * - decoding: Set/allocated/freed by user.
1071      */
1072     uint8_t *extradata;
1073     int extradata_size;
1074
1075     /**
1076      * This is the fundamental unit of time (in seconds) in terms
1077      * of which frame timestamps are represented. For fixed-fps content,
1078      * timebase should be 1/framerate and timestamp increments should be
1079      * identically 1.
1080      * - encoding: MUST be set by user.
1081      * - decoding: Set by libavcodec.
1082      */
1083     AVRational time_base;
1084
1085     /* video only */
1086     /**
1087      * picture width / height.
1088      * - encoding: MUST be set by user.
1089      * - decoding: Set by libavcodec.
1090      * Note: For compatibility it is possible to set this instead of
1091      * coded_width/height before decoding.
1092      */
1093     int width, height;
1094
1095 #define FF_ASPECT_EXTENDED 15
1096
1097     /**
1098      * the number of pictures in a group of pictures, or 0 for intra_only
1099      * - encoding: Set by user.
1100      * - decoding: unused
1101      */
1102     int gop_size;
1103
1104     /**
1105      * Pixel format, see PIX_FMT_xxx.
1106      * - encoding: Set by user.
1107      * - decoding: Set by libavcodec.
1108      */
1109     enum PixelFormat pix_fmt;
1110
1111     /**
1112      * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1113      * has to read frames at native frame rate.
1114      * - encoding: Set by user.
1115      * - decoding: unused
1116      */
1117     int rate_emu;
1118
1119     /**
1120      * If non NULL, 'draw_horiz_band' is called by the libavcodec
1121      * decoder to draw a horizontal band. It improves cache usage. Not
1122      * all codecs can do that. You must check the codec capabilities
1123      * beforehand.
1124      * The function is also used by hardware acceleration APIs.
1125      * It is called at least once during frame decoding to pass
1126      * the data needed for hardware render.
1127      * In that mode instead of pixel data, AVFrame points to
1128      * a structure specific to the acceleration API. The application
1129      * reads the structure and can change some fields to indicate progress
1130      * or mark state.
1131      * - encoding: unused
1132      * - decoding: Set by user.
1133      * @param height the height of the slice
1134      * @param y the y position of the slice
1135      * @param type 1->top field, 2->bottom field, 3->frame
1136      * @param offset offset into the AVFrame.data from which the slice should be read
1137      */
1138     void (*draw_horiz_band)(struct AVCodecContext *s,
1139                             const AVFrame *src, int offset[4],
1140                             int y, int type, int height);
1141
1142     /* audio only */
1143     int sample_rate; ///< samples per second
1144     int channels;    ///< number of audio channels
1145
1146     /**
1147      * audio sample format
1148      * - encoding: Set by user.
1149      * - decoding: Set by libavcodec.
1150      */
1151     enum SampleFormat sample_fmt;  ///< sample format
1152
1153     /* The following data should not be initialized. */
1154     /**
1155      * Samples per packet, initialized when calling 'init'.
1156      */
1157     int frame_size;
1158     int frame_number;   ///< audio or video frame number
1159 #if LIBAVCODEC_VERSION_MAJOR < 53
1160     int real_pict_num;  ///< Returns the real picture number of previous encoded frame.
1161 #endif
1162
1163     /**
1164      * Number of frames the decoded output will be delayed relative to
1165      * the encoded input.
1166      * - encoding: Set by libavcodec.
1167      * - decoding: unused
1168      */
1169     int delay;
1170
1171     /* - encoding parameters */
1172     float qcompress;  ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1173     float qblur;      ///< amount of qscale smoothing over time (0.0-1.0)
1174
1175     /**
1176      * minimum quantizer
1177      * - encoding: Set by user.
1178      * - decoding: unused
1179      */
1180     int qmin;
1181
1182     /**
1183      * maximum quantizer
1184      * - encoding: Set by user.
1185      * - decoding: unused
1186      */
1187     int qmax;
1188
1189     /**
1190      * maximum quantizer difference between frames
1191      * - encoding: Set by user.
1192      * - decoding: unused
1193      */
1194     int max_qdiff;
1195
1196     /**
1197      * maximum number of B-frames between non-B-frames
1198      * Note: The output will be delayed by max_b_frames+1 relative to the input.
1199      * - encoding: Set by user.
1200      * - decoding: unused
1201      */
1202     int max_b_frames;
1203
1204     /**
1205      * qscale factor between IP and B-frames
1206      * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1207      * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1208      * - encoding: Set by user.
1209      * - decoding: unused
1210      */
1211     float b_quant_factor;
1212
1213     /** obsolete FIXME remove */
1214     int rc_strategy;
1215 #define FF_RC_STRATEGY_XVID 1
1216
1217     int b_frame_strategy;
1218
1219     /**
1220      * hurry up amount
1221      * - encoding: unused
1222      * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1223      * @deprecated Deprecated in favor of skip_idct and skip_frame.
1224      */
1225     int hurry_up;
1226
1227     struct AVCodec *codec;
1228
1229     void *priv_data;
1230
1231     int rtp_payload_size;   /* The size of the RTP payload: the coder will  */
1232                             /* do its best to deliver a chunk with size     */
1233                             /* below rtp_payload_size, the chunk will start */
1234                             /* with a start code on some codecs like H.263. */
1235                             /* This doesn't take account of any particular  */
1236                             /* headers inside the transmitted RTP payload.  */
1237
1238
1239     /* The RTP callback: This function is called    */
1240     /* every time the encoder has a packet to send. */
1241     /* It depends on the encoder if the data starts */
1242     /* with a Start Code (it should). H.263 does.   */
1243     /* mb_nb contains the number of macroblocks     */
1244     /* encoded in the RTP payload.                  */
1245     void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1246
1247     /* statistics, used for 2-pass encoding */
1248     int mv_bits;
1249     int header_bits;
1250     int i_tex_bits;
1251     int p_tex_bits;
1252     int i_count;
1253     int p_count;
1254     int skip_count;
1255     int misc_bits;
1256
1257     /**
1258      * number of bits used for the previously encoded frame
1259      * - encoding: Set by libavcodec.
1260      * - decoding: unused
1261      */
1262     int frame_bits;
1263
1264     /**
1265      * Private data of the user, can be used to carry app specific stuff.
1266      * - encoding: Set by user.
1267      * - decoding: Set by user.
1268      */
1269     void *opaque;
1270
1271     char codec_name[32];
1272     enum CodecType codec_type; /* see CODEC_TYPE_xxx */
1273     enum CodecID codec_id; /* see CODEC_ID_xxx */
1274
1275     /**
1276      * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1277      * This is used to work around some encoder bugs.
1278      * A demuxer should set this to what is stored in the field used to identify the codec.
1279      * If there are multiple such fields in a container then the demuxer should choose the one
1280      * which maximizes the information about the used codec.
1281      * If the codec tag field in a container is larger then 32 bits then the demuxer should
1282      * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1283      * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1284      * first.
1285      * - encoding: Set by user, if not then the default based on codec_id will be used.
1286      * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1287      */
1288     unsigned int codec_tag;
1289
1290     /**
1291      * Work around bugs in encoders which sometimes cannot be detected automatically.
1292      * - encoding: Set by user
1293      * - decoding: Set by user
1294      */
1295     int workaround_bugs;
1296 #define FF_BUG_AUTODETECT       1  ///< autodetection
1297 #define FF_BUG_OLD_MSMPEG4      2
1298 #define FF_BUG_XVID_ILACE       4
1299 #define FF_BUG_UMP4             8
1300 #define FF_BUG_NO_PADDING       16
1301 #define FF_BUG_AMV              32
1302 #define FF_BUG_AC_VLC           0  ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1303 #define FF_BUG_QPEL_CHROMA      64
1304 #define FF_BUG_STD_QPEL         128
1305 #define FF_BUG_QPEL_CHROMA2     256
1306 #define FF_BUG_DIRECT_BLOCKSIZE 512
1307 #define FF_BUG_EDGE             1024
1308 #define FF_BUG_HPEL_CHROMA      2048
1309 #define FF_BUG_DC_CLIP          4096
1310 #define FF_BUG_MS               8192 ///< Work around various bugs in Microsoft's broken decoders.
1311 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1312
1313     /**
1314      * luma single coefficient elimination threshold
1315      * - encoding: Set by user.
1316      * - decoding: unused
1317      */
1318     int luma_elim_threshold;
1319
1320     /**
1321      * chroma single coeff elimination threshold
1322      * - encoding: Set by user.
1323      * - decoding: unused
1324      */
1325     int chroma_elim_threshold;
1326
1327     /**
1328      * strictly follow the standard (MPEG4, ...).
1329      * - encoding: Set by user.
1330      * - decoding: Set by user.
1331      * Setting this to STRICT or higher means the encoder and decoder will
1332      * generally do stupid things. While setting it to inofficial or lower
1333      * will mean the encoder might use things that are not supported by all
1334      * spec compliant decoders. Decoders make no difference between normal,
1335      * inofficial and experimental, that is they always try to decode things
1336      * when they can unless they are explicitly asked to behave stupid
1337      * (=strictly conform to the specs)
1338      */
1339     int strict_std_compliance;
1340 #define FF_COMPLIANCE_VERY_STRICT   2 ///< Strictly conform to a older more strict version of the spec or reference software.
1341 #define FF_COMPLIANCE_STRICT        1 ///< Strictly conform to all the things in the spec no matter what consequences.
1342 #define FF_COMPLIANCE_NORMAL        0
1343 #define FF_COMPLIANCE_INOFFICIAL   -1 ///< Allow inofficial extensions.
1344 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1345
1346     /**
1347      * qscale offset between IP and B-frames
1348      * - encoding: Set by user.
1349      * - decoding: unused
1350      */
1351     float b_quant_offset;
1352
1353     /**
1354      * Error recognization; higher values will detect more errors but may
1355      * misdetect some more or less valid parts as errors.
1356      * - encoding: unused
1357      * - decoding: Set by user.
1358      */
1359     int error_recognition;
1360 #define FF_ER_CAREFUL         1
1361 #define FF_ER_COMPLIANT       2
1362 #define FF_ER_AGGRESSIVE      3
1363 #define FF_ER_VERY_AGGRESSIVE 4
1364
1365     /**
1366      * Called at the beginning of each frame to get a buffer for it.
1367      * If pic.reference is set then the frame will be read later by libavcodec.
1368      * avcodec_align_dimensions() should be used to find the required width and
1369      * height, as they normally need to be rounded up to the next multiple of 16.
1370      * if CODEC_CAP_DR1 is not set then get_buffer() must call
1371      * avcodec_default_get_buffer() instead of providing buffers allocated by
1372      * some other means.
1373      * - encoding: unused
1374      * - decoding: Set by libavcodec., user can override.
1375      */
1376     int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1377
1378     /**
1379      * Called to release buffers which were allocated with get_buffer.
1380      * A released buffer can be reused in get_buffer().
1381      * pic.data[*] must be set to NULL.
1382      * - encoding: unused
1383      * - decoding: Set by libavcodec., user can override.
1384      */
1385     void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1386
1387     /**
1388      * Size of the frame reordering buffer in the decoder.
1389      * For MPEG-2 it is 1 IPB or 0 low delay IP.
1390      * - encoding: Set by libavcodec.
1391      * - decoding: Set by libavcodec.
1392      */
1393     int has_b_frames;
1394
1395     /**
1396      * number of bytes per packet if constant and known or 0
1397      * Used by some WAV based audio codecs.
1398      */
1399     int block_align;
1400
1401     int parse_only; /* - decoding only: If true, only parsing is done
1402                        (function avcodec_parse_frame()). The frame
1403                        data is returned. Only MPEG codecs support this now. */
1404
1405     /**
1406      * 0-> h263 quant 1-> mpeg quant
1407      * - encoding: Set by user.
1408      * - decoding: unused
1409      */
1410     int mpeg_quant;
1411
1412     /**
1413      * pass1 encoding statistics output buffer
1414      * - encoding: Set by libavcodec.
1415      * - decoding: unused
1416      */
1417     char *stats_out;
1418
1419     /**
1420      * pass2 encoding statistics input buffer
1421      * Concatenated stuff from stats_out of pass1 should be placed here.
1422      * - encoding: Allocated/set/freed by user.
1423      * - decoding: unused
1424      */
1425     char *stats_in;
1426
1427     /**
1428      * ratecontrol qmin qmax limiting method
1429      * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1430      * - encoding: Set by user.
1431      * - decoding: unused
1432      */
1433     float rc_qsquish;
1434
1435     float rc_qmod_amp;
1436     int rc_qmod_freq;
1437
1438     /**
1439      * ratecontrol override, see RcOverride
1440      * - encoding: Allocated/set/freed by user.
1441      * - decoding: unused
1442      */
1443     RcOverride *rc_override;
1444     int rc_override_count;
1445
1446     /**
1447      * rate control equation
1448      * - encoding: Set by user
1449      * - decoding: unused
1450      */
1451     const char *rc_eq;
1452
1453     /**
1454      * maximum bitrate
1455      * - encoding: Set by user.
1456      * - decoding: unused
1457      */
1458     int rc_max_rate;
1459
1460     /**
1461      * minimum bitrate
1462      * - encoding: Set by user.
1463      * - decoding: unused
1464      */
1465     int rc_min_rate;
1466
1467     /**
1468      * decoder bitstream buffer size
1469      * - encoding: Set by user.
1470      * - decoding: unused
1471      */
1472     int rc_buffer_size;
1473     float rc_buffer_aggressivity;
1474
1475     /**
1476      * qscale factor between P and I-frames
1477      * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1478      * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1479      * - encoding: Set by user.
1480      * - decoding: unused
1481      */
1482     float i_quant_factor;
1483
1484     /**
1485      * qscale offset between P and I-frames
1486      * - encoding: Set by user.
1487      * - decoding: unused
1488      */
1489     float i_quant_offset;
1490
1491     /**
1492      * initial complexity for pass1 ratecontrol
1493      * - encoding: Set by user.
1494      * - decoding: unused
1495      */
1496     float rc_initial_cplx;
1497
1498     /**
1499      * DCT algorithm, see FF_DCT_* below
1500      * - encoding: Set by user.
1501      * - decoding: unused
1502      */
1503     int dct_algo;
1504 #define FF_DCT_AUTO    0
1505 #define FF_DCT_FASTINT 1
1506 #define FF_DCT_INT     2
1507 #define FF_DCT_MMX     3
1508 #define FF_DCT_MLIB    4
1509 #define FF_DCT_ALTIVEC 5
1510 #define FF_DCT_FAAN    6
1511
1512     /**
1513      * luminance masking (0-> disabled)
1514      * - encoding: Set by user.
1515      * - decoding: unused
1516      */
1517     float lumi_masking;
1518
1519     /**
1520      * temporary complexity masking (0-> disabled)
1521      * - encoding: Set by user.
1522      * - decoding: unused
1523      */
1524     float temporal_cplx_masking;
1525
1526     /**
1527      * spatial complexity masking (0-> disabled)
1528      * - encoding: Set by user.
1529      * - decoding: unused
1530      */
1531     float spatial_cplx_masking;
1532
1533     /**
1534      * p block masking (0-> disabled)
1535      * - encoding: Set by user.
1536      * - decoding: unused
1537      */
1538     float p_masking;
1539
1540     /**
1541      * darkness masking (0-> disabled)
1542      * - encoding: Set by user.
1543      * - decoding: unused
1544      */
1545     float dark_masking;
1546
1547     /**
1548      * IDCT algorithm, see FF_IDCT_* below.
1549      * - encoding: Set by user.
1550      * - decoding: Set by user.
1551      */
1552     int idct_algo;
1553 #define FF_IDCT_AUTO          0
1554 #define FF_IDCT_INT           1
1555 #define FF_IDCT_SIMPLE        2
1556 #define FF_IDCT_SIMPLEMMX     3
1557 #define FF_IDCT_LIBMPEG2MMX   4
1558 #define FF_IDCT_PS2           5
1559 #define FF_IDCT_MLIB          6
1560 #define FF_IDCT_ARM           7
1561 #define FF_IDCT_ALTIVEC       8
1562 #define FF_IDCT_SH4           9
1563 #define FF_IDCT_SIMPLEARM     10
1564 #define FF_IDCT_H264          11
1565 #define FF_IDCT_VP3           12
1566 #define FF_IDCT_IPP           13
1567 #define FF_IDCT_XVIDMMX       14
1568 #define FF_IDCT_CAVS          15
1569 #define FF_IDCT_SIMPLEARMV5TE 16
1570 #define FF_IDCT_SIMPLEARMV6   17
1571 #define FF_IDCT_SIMPLEVIS     18
1572 #define FF_IDCT_WMV2          19
1573 #define FF_IDCT_FAAN          20
1574 #define FF_IDCT_EA            21
1575 #define FF_IDCT_SIMPLENEON    22
1576 #define FF_IDCT_SIMPLEALPHA   23
1577
1578     /**
1579      * slice count
1580      * - encoding: Set by libavcodec.
1581      * - decoding: Set by user (or 0).
1582      */
1583     int slice_count;
1584     /**
1585      * slice offsets in the frame in bytes
1586      * - encoding: Set/allocated by libavcodec.
1587      * - decoding: Set/allocated by user (or NULL).
1588      */
1589     int *slice_offset;
1590
1591     /**
1592      * error concealment flags
1593      * - encoding: unused
1594      * - decoding: Set by user.
1595      */
1596     int error_concealment;
1597 #define FF_EC_GUESS_MVS   1
1598 #define FF_EC_DEBLOCK     2
1599
1600     /**
1601      * dsp_mask could be add used to disable unwanted CPU features
1602      * CPU features (i.e. MMX, SSE. ...)
1603      *
1604      * With the FORCE flag you may instead enable given CPU features.
1605      * (Dangerous: Usable in case of misdetection, improper usage however will
1606      * result into program crash.)
1607      */
1608     unsigned dsp_mask;
1609 #define FF_MM_FORCE    0x80000000 /* Force usage of selected flags (OR) */
1610     /* lower 16 bits - CPU features */
1611 #define FF_MM_MMX      0x0001 ///< standard MMX
1612 #define FF_MM_3DNOW    0x0004 ///< AMD 3DNOW
1613 #if LIBAVCODEC_VERSION_MAJOR < 53
1614 #define FF_MM_MMXEXT   0x0002 ///< SSE integer functions or AMD MMX ext
1615 #endif
1616 #define FF_MM_MMX2     0x0002 ///< SSE integer functions or AMD MMX ext
1617 #define FF_MM_SSE      0x0008 ///< SSE functions
1618 #define FF_MM_SSE2     0x0010 ///< PIV SSE2 functions
1619 #define FF_MM_3DNOWEXT 0x0020 ///< AMD 3DNowExt
1620 #define FF_MM_SSE3     0x0040 ///< Prescott SSE3 functions
1621 #define FF_MM_SSSE3    0x0080 ///< Conroe SSSE3 functions
1622 #define FF_MM_SSE4     0x0100 ///< Penryn SSE4.1 functions
1623 #define FF_MM_SSE42    0x0200 ///< Nehalem SSE4.2 functions
1624 #define FF_MM_IWMMXT   0x0100 ///< XScale IWMMXT
1625 #define FF_MM_ALTIVEC  0x0001 ///< standard AltiVec
1626
1627     /**
1628      * bits per sample/pixel from the demuxer (needed for huffyuv).
1629      * - encoding: Set by libavcodec.
1630      * - decoding: Set by user.
1631      */
1632      int bits_per_coded_sample;
1633
1634     /**
1635      * prediction method (needed for huffyuv)
1636      * - encoding: Set by user.
1637      * - decoding: unused
1638      */
1639      int prediction_method;
1640 #define FF_PRED_LEFT   0
1641 #define FF_PRED_PLANE  1
1642 #define FF_PRED_MEDIAN 2
1643
1644     /**
1645      * sample aspect ratio (0 if unknown)
1646      * That is the width of a pixel divided by the height of the pixel.
1647      * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1648      * - encoding: Set by user.
1649      * - decoding: Set by libavcodec.
1650      */
1651     AVRational sample_aspect_ratio;
1652
1653     /**
1654      * the picture in the bitstream
1655      * - encoding: Set by libavcodec.
1656      * - decoding: Set by libavcodec.
1657      */
1658     AVFrame *coded_frame;
1659
1660     /**
1661      * debug
1662      * - encoding: Set by user.
1663      * - decoding: Set by user.
1664      */
1665     int debug;
1666 #define FF_DEBUG_PICT_INFO   1
1667 #define FF_DEBUG_RC          2
1668 #define FF_DEBUG_BITSTREAM   4
1669 #define FF_DEBUG_MB_TYPE     8
1670 #define FF_DEBUG_QP          16
1671 #define FF_DEBUG_MV          32
1672 #define FF_DEBUG_DCT_COEFF   0x00000040
1673 #define FF_DEBUG_SKIP        0x00000080
1674 #define FF_DEBUG_STARTCODE   0x00000100
1675 #define FF_DEBUG_PTS         0x00000200
1676 #define FF_DEBUG_ER          0x00000400
1677 #define FF_DEBUG_MMCO        0x00000800
1678 #define FF_DEBUG_BUGS        0x00001000
1679 #define FF_DEBUG_VIS_QP      0x00002000
1680 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1681 #define FF_DEBUG_BUFFERS     0x00008000
1682
1683     /**
1684      * debug
1685      * - encoding: Set by user.
1686      * - decoding: Set by user.
1687      */
1688     int debug_mv;
1689 #define FF_DEBUG_VIS_MV_P_FOR  0x00000001 //visualize forward predicted MVs of P frames
1690 #define FF_DEBUG_VIS_MV_B_FOR  0x00000002 //visualize forward predicted MVs of B frames
1691 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1692
1693     /**
1694      * error
1695      * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1696      * - decoding: unused
1697      */
1698     uint64_t error[4];
1699
1700     /**
1701      * minimum MB quantizer
1702      * - encoding: unused
1703      * - decoding: unused
1704      */
1705     int mb_qmin;
1706
1707     /**
1708      * maximum MB quantizer
1709      * - encoding: unused
1710      * - decoding: unused
1711      */
1712     int mb_qmax;
1713
1714     /**
1715      * motion estimation comparison function
1716      * - encoding: Set by user.
1717      * - decoding: unused
1718      */
1719     int me_cmp;
1720     /**
1721      * subpixel motion estimation comparison function
1722      * - encoding: Set by user.
1723      * - decoding: unused
1724      */
1725     int me_sub_cmp;
1726     /**
1727      * macroblock comparison function (not supported yet)
1728      * - encoding: Set by user.
1729      * - decoding: unused
1730      */
1731     int mb_cmp;
1732     /**
1733      * interlaced DCT comparison function
1734      * - encoding: Set by user.
1735      * - decoding: unused
1736      */
1737     int ildct_cmp;
1738 #define FF_CMP_SAD    0
1739 #define FF_CMP_SSE    1
1740 #define FF_CMP_SATD   2
1741 #define FF_CMP_DCT    3
1742 #define FF_CMP_PSNR   4
1743 #define FF_CMP_BIT    5
1744 #define FF_CMP_RD     6
1745 #define FF_CMP_ZERO   7
1746 #define FF_CMP_VSAD   8
1747 #define FF_CMP_VSSE   9
1748 #define FF_CMP_NSSE   10
1749 #define FF_CMP_W53    11
1750 #define FF_CMP_W97    12
1751 #define FF_CMP_DCTMAX 13
1752 #define FF_CMP_DCT264 14
1753 #define FF_CMP_CHROMA 256
1754
1755     /**
1756      * ME diamond size & shape
1757      * - encoding: Set by user.
1758      * - decoding: unused
1759      */
1760     int dia_size;
1761
1762     /**
1763      * amount of previous MV predictors (2a+1 x 2a+1 square)
1764      * - encoding: Set by user.
1765      * - decoding: unused
1766      */
1767     int last_predictor_count;
1768
1769     /**
1770      * prepass for motion estimation
1771      * - encoding: Set by user.
1772      * - decoding: unused
1773      */
1774     int pre_me;
1775
1776     /**
1777      * motion estimation prepass comparison function
1778      * - encoding: Set by user.
1779      * - decoding: unused
1780      */
1781     int me_pre_cmp;
1782
1783     /**
1784      * ME prepass diamond size & shape
1785      * - encoding: Set by user.
1786      * - decoding: unused
1787      */
1788     int pre_dia_size;
1789
1790     /**
1791      * subpel ME quality
1792      * - encoding: Set by user.
1793      * - decoding: unused
1794      */
1795     int me_subpel_quality;
1796
1797     /**
1798      * callback to negotiate the pixelFormat
1799      * @param fmt is the list of formats which are supported by the codec,
1800      * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1801      * The first is always the native one.
1802      * @return the chosen format
1803      * - encoding: unused
1804      * - decoding: Set by user, if not set the native format will be chosen.
1805      */
1806     enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1807
1808     /**
1809      * DTG active format information (additional aspect ratio
1810      * information only used in DVB MPEG-2 transport streams)
1811      * 0 if not set.
1812      *
1813      * - encoding: unused
1814      * - decoding: Set by decoder.
1815      */
1816     int dtg_active_format;
1817 #define FF_DTG_AFD_SAME         8
1818 #define FF_DTG_AFD_4_3          9
1819 #define FF_DTG_AFD_16_9         10
1820 #define FF_DTG_AFD_14_9         11
1821 #define FF_DTG_AFD_4_3_SP_14_9  13
1822 #define FF_DTG_AFD_16_9_SP_14_9 14
1823 #define FF_DTG_AFD_SP_4_3       15
1824
1825     /**
1826      * maximum motion estimation search range in subpel units
1827      * If 0 then no limit.
1828      *
1829      * - encoding: Set by user.
1830      * - decoding: unused
1831      */
1832     int me_range;
1833
1834     /**
1835      * intra quantizer bias
1836      * - encoding: Set by user.
1837      * - decoding: unused
1838      */
1839     int intra_quant_bias;
1840 #define FF_DEFAULT_QUANT_BIAS 999999
1841
1842     /**
1843      * inter quantizer bias
1844      * - encoding: Set by user.
1845      * - decoding: unused
1846      */
1847     int inter_quant_bias;
1848
1849     /**
1850      * color table ID
1851      * - encoding: unused
1852      * - decoding: Which clrtable should be used for 8bit RGB images.
1853      *             Tables have to be stored somewhere. FIXME
1854      */
1855     int color_table_id;
1856
1857     /**
1858      * internal_buffer count
1859      * Don't touch, used by libavcodec default_get_buffer().
1860      */
1861     int internal_buffer_count;
1862
1863     /**
1864      * internal_buffers
1865      * Don't touch, used by libavcodec default_get_buffer().
1866      */
1867     void *internal_buffer;
1868
1869 #define FF_LAMBDA_SHIFT 7
1870 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1871 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1872 #define FF_LAMBDA_MAX (256*128-1)
1873
1874 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1875     /**
1876      * Global quality for codecs which cannot change it per frame.
1877      * This should be proportional to MPEG-1/2/4 qscale.
1878      * - encoding: Set by user.
1879      * - decoding: unused
1880      */
1881     int global_quality;
1882
1883 #define FF_CODER_TYPE_VLC       0
1884 #define FF_CODER_TYPE_AC        1
1885 #define FF_CODER_TYPE_RAW       2
1886 #define FF_CODER_TYPE_RLE       3
1887 #define FF_CODER_TYPE_DEFLATE   4
1888     /**
1889      * coder type
1890      * - encoding: Set by user.
1891      * - decoding: unused
1892      */
1893     int coder_type;
1894
1895     /**
1896      * context model
1897      * - encoding: Set by user.
1898      * - decoding: unused
1899      */
1900     int context_model;
1901 #if 0
1902     /**
1903      *
1904      * - encoding: unused
1905      * - decoding: Set by user.
1906      */
1907     uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1908 #endif
1909
1910     /**
1911      * slice flags
1912      * - encoding: unused
1913      * - decoding: Set by user.
1914      */
1915     int slice_flags;
1916 #define SLICE_FLAG_CODED_ORDER    0x0001 ///< draw_horiz_band() is called in coded order instead of display
1917 #define SLICE_FLAG_ALLOW_FIELD    0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1918 #define SLICE_FLAG_ALLOW_PLANE    0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1919
1920     /**
1921      * XVideo Motion Acceleration
1922      * - encoding: forbidden
1923      * - decoding: set by decoder
1924      */
1925     int xvmc_acceleration;
1926
1927     /**
1928      * macroblock decision mode
1929      * - encoding: Set by user.
1930      * - decoding: unused
1931      */
1932     int mb_decision;
1933 #define FF_MB_DECISION_SIMPLE 0        ///< uses mb_cmp
1934 #define FF_MB_DECISION_BITS   1        ///< chooses the one which needs the fewest bits
1935 #define FF_MB_DECISION_RD     2        ///< rate distortion
1936
1937     /**
1938      * custom intra quantization matrix
1939      * - encoding: Set by user, can be NULL.
1940      * - decoding: Set by libavcodec.
1941      */
1942     uint16_t *intra_matrix;
1943
1944     /**
1945      * custom inter quantization matrix
1946      * - encoding: Set by user, can be NULL.
1947      * - decoding: Set by libavcodec.
1948      */
1949     uint16_t *inter_matrix;
1950
1951     /**
1952      * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1953      * This is used to work around some encoder bugs.
1954      * - encoding: unused
1955      * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1956      */
1957     unsigned int stream_codec_tag;
1958
1959     /**
1960      * scene change detection threshold
1961      * 0 is default, larger means fewer detected scene changes.
1962      * - encoding: Set by user.
1963      * - decoding: unused
1964      */
1965     int scenechange_threshold;
1966
1967     /**
1968      * minimum Lagrange multipler
1969      * - encoding: Set by user.
1970      * - decoding: unused
1971      */
1972     int lmin;
1973
1974     /**
1975      * maximum Lagrange multipler
1976      * - encoding: Set by user.
1977      * - decoding: unused
1978      */
1979     int lmax;
1980
1981     /**
1982      * palette control structure
1983      * - encoding: ??? (no palette-enabled encoder yet)
1984      * - decoding: Set by user.
1985      */
1986     struct AVPaletteControl *palctrl;
1987
1988     /**
1989      * noise reduction strength
1990      * - encoding: Set by user.
1991      * - decoding: unused
1992      */
1993     int noise_reduction;
1994
1995     /**
1996      * Called at the beginning of a frame to get cr buffer for it.
1997      * Buffer type (size, hints) must be the same. libavcodec won't check it.
1998      * libavcodec will pass previous buffer in pic, function should return
1999      * same buffer or new buffer with old frame "painted" into it.
2000      * If pic.data[0] == NULL must behave like get_buffer().
2001      * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2002      * avcodec_default_reget_buffer() instead of providing buffers allocated by
2003      * some other means.
2004      * - encoding: unused
2005      * - decoding: Set by libavcodec., user can override
2006      */
2007     int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2008
2009     /**
2010      * Number of bits which should be loaded into the rc buffer before decoding starts.
2011      * - encoding: Set by user.
2012      * - decoding: unused
2013      */
2014     int rc_initial_buffer_occupancy;
2015
2016     /**
2017      *
2018      * - encoding: Set by user.
2019      * - decoding: unused
2020      */
2021     int inter_threshold;
2022
2023     /**
2024      * CODEC_FLAG2_*
2025      * - encoding: Set by user.
2026      * - decoding: Set by user.
2027      */
2028     int flags2;
2029
2030     /**
2031      * Simulates errors in the bitstream to test error concealment.
2032      * - encoding: Set by user.
2033      * - decoding: unused
2034      */
2035     int error_rate;
2036
2037     /**
2038      * MP3 antialias algorithm, see FF_AA_* below.
2039      * - encoding: unused
2040      * - decoding: Set by user.
2041      */
2042     int antialias_algo;
2043 #define FF_AA_AUTO    0
2044 #define FF_AA_FASTINT 1 //not implemented yet
2045 #define FF_AA_INT     2
2046 #define FF_AA_FLOAT   3
2047     /**
2048      * quantizer noise shaping
2049      * - encoding: Set by user.
2050      * - decoding: unused
2051      */
2052     int quantizer_noise_shaping;
2053
2054     /**
2055      * thread count
2056      * is used to decide how many independent tasks should be passed to execute()
2057      * - encoding: Set by user.
2058      * - decoding: Set by user.
2059      */
2060     int thread_count;
2061
2062     /**
2063      * The codec may call this to execute several independent things.
2064      * It will return only after finishing all tasks.
2065      * The user may replace this with some multithreaded implementation,
2066      * the default implementation will execute the parts serially.
2067      * @param count the number of things to execute
2068      * - encoding: Set by libavcodec, user can override.
2069      * - decoding: Set by libavcodec, user can override.
2070      */
2071     int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2072
2073     /**
2074      * thread opaque
2075      * Can be used by execute() to store some per AVCodecContext stuff.
2076      * - encoding: set by execute()
2077      * - decoding: set by execute()
2078      */
2079     void *thread_opaque;
2080
2081     /**
2082      * Motion estimation threshold below which no motion estimation is
2083      * performed, but instead the user specified motion vectors are used.
2084      *
2085      * - encoding: Set by user.
2086      * - decoding: unused
2087      */
2088      int me_threshold;
2089
2090     /**
2091      * Macroblock threshold below which the user specified macroblock types will be used.
2092      * - encoding: Set by user.
2093      * - decoding: unused
2094      */
2095      int mb_threshold;
2096
2097     /**
2098      * precision of the intra DC coefficient - 8
2099      * - encoding: Set by user.
2100      * - decoding: unused
2101      */
2102      int intra_dc_precision;
2103
2104     /**
2105      * noise vs. sse weight for the nsse comparsion function
2106      * - encoding: Set by user.
2107      * - decoding: unused
2108      */
2109      int nsse_weight;
2110
2111     /**
2112      * Number of macroblock rows at the top which are skipped.
2113      * - encoding: unused
2114      * - decoding: Set by user.
2115      */
2116      int skip_top;
2117
2118     /**
2119      * Number of macroblock rows at the bottom which are skipped.
2120      * - encoding: unused
2121      * - decoding: Set by user.
2122      */
2123      int skip_bottom;
2124
2125     /**
2126      * profile
2127      * - encoding: Set by user.
2128      * - decoding: Set by libavcodec.
2129      */
2130      int profile;
2131 #define FF_PROFILE_UNKNOWN -99
2132
2133 #define FF_PROFILE_AAC_MAIN 0
2134 #define FF_PROFILE_AAC_LOW  1
2135 #define FF_PROFILE_AAC_SSR  2
2136 #define FF_PROFILE_AAC_LTP  3
2137
2138 #define FF_PROFILE_H264_BASELINE    66
2139 #define FF_PROFILE_H264_MAIN        77
2140 #define FF_PROFILE_H264_EXTENDED    88
2141 #define FF_PROFILE_H264_HIGH        100
2142 #define FF_PROFILE_H264_HIGH_10     110
2143 #define FF_PROFILE_H264_HIGH_422    122
2144 #define FF_PROFILE_H264_HIGH_444    244
2145 #define FF_PROFILE_H264_CAVLC_444   44
2146
2147     /**
2148      * level
2149      * - encoding: Set by user.
2150      * - decoding: Set by libavcodec.
2151      */
2152      int level;
2153 #define FF_LEVEL_UNKNOWN -99
2154
2155     /**
2156      * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2157      * - encoding: unused
2158      * - decoding: Set by user.
2159      */
2160      int lowres;
2161
2162     /**
2163      * Bitstream width / height, may be different from width/height if lowres
2164      * or other things are used.
2165      * - encoding: unused
2166      * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2167      */
2168     int coded_width, coded_height;
2169
2170     /**
2171      * frame skip threshold
2172      * - encoding: Set by user.
2173      * - decoding: unused
2174      */
2175     int frame_skip_threshold;
2176
2177     /**
2178      * frame skip factor
2179      * - encoding: Set by user.
2180      * - decoding: unused
2181      */
2182     int frame_skip_factor;
2183
2184     /**
2185      * frame skip exponent
2186      * - encoding: Set by user.
2187      * - decoding: unused
2188      */
2189     int frame_skip_exp;
2190
2191     /**
2192      * frame skip comparison function
2193      * - encoding: Set by user.
2194      * - decoding: unused
2195      */
2196     int frame_skip_cmp;
2197
2198     /**
2199      * Border processing masking, raises the quantizer for mbs on the borders
2200      * of the picture.
2201      * - encoding: Set by user.
2202      * - decoding: unused
2203      */
2204     float border_masking;
2205
2206     /**
2207      * minimum MB lagrange multipler
2208      * - encoding: Set by user.
2209      * - decoding: unused
2210      */
2211     int mb_lmin;
2212
2213     /**
2214      * maximum MB lagrange multipler
2215      * - encoding: Set by user.
2216      * - decoding: unused
2217      */
2218     int mb_lmax;
2219
2220     /**
2221      *
2222      * - encoding: Set by user.
2223      * - decoding: unused
2224      */
2225     int me_penalty_compensation;
2226
2227     /**
2228      *
2229      * - encoding: unused
2230      * - decoding: Set by user.
2231      */
2232     enum AVDiscard skip_loop_filter;
2233
2234     /**
2235      *
2236      * - encoding: unused
2237      * - decoding: Set by user.
2238      */
2239     enum AVDiscard skip_idct;
2240
2241     /**
2242      *
2243      * - encoding: unused
2244      * - decoding: Set by user.
2245      */
2246     enum AVDiscard skip_frame;
2247
2248     /**
2249      *
2250      * - encoding: Set by user.
2251      * - decoding: unused
2252      */
2253     int bidir_refine;
2254
2255     /**
2256      *
2257      * - encoding: Set by user.
2258      * - decoding: unused
2259      */
2260     int brd_scale;
2261
2262     /**
2263      * constant rate factor - quality-based VBR - values ~correspond to qps
2264      * - encoding: Set by user.
2265      * - decoding: unused
2266      */
2267     float crf;
2268
2269     /**
2270      * constant quantization parameter rate control method
2271      * - encoding: Set by user.
2272      * - decoding: unused
2273      */
2274     int cqp;
2275
2276     /**
2277      * minimum GOP size
2278      * - encoding: Set by user.
2279      * - decoding: unused
2280      */
2281     int keyint_min;
2282
2283     /**
2284      * number of reference frames
2285      * - encoding: Set by user.
2286      * - decoding: Set by lavc.
2287      */
2288     int refs;
2289
2290     /**
2291      * chroma qp offset from luma
2292      * - encoding: Set by user.
2293      * - decoding: unused
2294      */
2295     int chromaoffset;
2296
2297     /**
2298      * Influences how often B-frames are used.
2299      * - encoding: Set by user.
2300      * - decoding: unused
2301      */
2302     int bframebias;
2303
2304     /**
2305      * trellis RD quantization
2306      * - encoding: Set by user.
2307      * - decoding: unused
2308      */
2309     int trellis;
2310
2311     /**
2312      * Reduce fluctuations in qp (before curve compression).
2313      * - encoding: Set by user.
2314      * - decoding: unused
2315      */
2316     float complexityblur;
2317
2318     /**
2319      * in-loop deblocking filter alphac0 parameter
2320      * alpha is in the range -6...6
2321      * - encoding: Set by user.
2322      * - decoding: unused
2323      */
2324     int deblockalpha;
2325
2326     /**
2327      * in-loop deblocking filter beta parameter
2328      * beta is in the range -6...6
2329      * - encoding: Set by user.
2330      * - decoding: unused
2331      */
2332     int deblockbeta;
2333
2334     /**
2335      * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2336      * - encoding: Set by user.
2337      * - decoding: unused
2338      */
2339     int partitions;
2340 #define X264_PART_I4X4 0x001  /* Analyze i4x4 */
2341 #define X264_PART_I8X8 0x002  /* Analyze i8x8 (requires 8x8 transform) */
2342 #define X264_PART_P8X8 0x010  /* Analyze p16x8, p8x16 and p8x8 */
2343 #define X264_PART_P4X4 0x020  /* Analyze p8x4, p4x8, p4x4 */
2344 #define X264_PART_B8X8 0x100  /* Analyze b16x8, b8x16 and b8x8 */
2345
2346     /**
2347      * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2348      * - encoding: Set by user.
2349      * - decoding: unused
2350      */
2351     int directpred;
2352
2353     /**
2354      * Audio cutoff bandwidth (0 means "automatic")
2355      * - encoding: Set by user.
2356      * - decoding: unused
2357      */
2358     int cutoff;
2359
2360     /**
2361      * Multiplied by qscale for each frame and added to scene_change_score.
2362      * - encoding: Set by user.
2363      * - decoding: unused
2364      */
2365     int scenechange_factor;
2366
2367     /**
2368      *
2369      * Note: Value depends upon the compare function used for fullpel ME.
2370      * - encoding: Set by user.
2371      * - decoding: unused
2372      */
2373     int mv0_threshold;
2374
2375     /**
2376      * Adjusts sensitivity of b_frame_strategy 1.
2377      * - encoding: Set by user.
2378      * - decoding: unused
2379      */
2380     int b_sensitivity;
2381
2382     /**
2383      * - encoding: Set by user.
2384      * - decoding: unused
2385      */
2386     int compression_level;
2387 #define FF_COMPRESSION_DEFAULT -1
2388
2389     /**
2390      * Sets whether to use LPC mode - used by FLAC encoder.
2391      * - encoding: Set by user.
2392      * - decoding: unused
2393      */
2394     int use_lpc;
2395
2396     /**
2397      * LPC coefficient precision - used by FLAC encoder
2398      * - encoding: Set by user.
2399      * - decoding: unused
2400      */
2401     int lpc_coeff_precision;
2402
2403     /**
2404      * - encoding: Set by user.
2405      * - decoding: unused
2406      */
2407     int min_prediction_order;
2408
2409     /**
2410      * - encoding: Set by user.
2411      * - decoding: unused
2412      */
2413     int max_prediction_order;
2414
2415     /**
2416      * search method for selecting prediction order
2417      * - encoding: Set by user.
2418      * - decoding: unused
2419      */
2420     int prediction_order_method;
2421
2422     /**
2423      * - encoding: Set by user.
2424      * - decoding: unused
2425      */
2426     int min_partition_order;
2427
2428     /**
2429      * - encoding: Set by user.
2430      * - decoding: unused
2431      */
2432     int max_partition_order;
2433
2434     /**
2435      * GOP timecode frame start number, in non drop frame format
2436      * - encoding: Set by user.
2437      * - decoding: unused
2438      */
2439     int64_t timecode_frame_start;
2440
2441 #if LIBAVCODEC_VERSION_MAJOR < 53
2442     /**
2443      * Decoder should decode to this many channels if it can (0 for default)
2444      * - encoding: unused
2445      * - decoding: Set by user.
2446      * @deprecated Deprecated in favor of request_channel_layout.
2447      */
2448     int request_channels;
2449 #endif
2450
2451     /**
2452      * Percentage of dynamic range compression to be applied by the decoder.
2453      * The default value is 1.0, corresponding to full compression.
2454      * - encoding: unused
2455      * - decoding: Set by user.
2456      */
2457     float drc_scale;
2458
2459     /**
2460      * opaque 64bit number (generally a PTS) that will be reordered and
2461      * output in AVFrame.reordered_opaque
2462      * - encoding: unused
2463      * - decoding: Set by user.
2464      */
2465     int64_t reordered_opaque;
2466
2467     /**
2468      * Bits per sample/pixel of internal libavcodec pixel/sample format.
2469      * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
2470      * - encoding: set by user.
2471      * - decoding: set by libavcodec.
2472      */
2473     int bits_per_raw_sample;
2474
2475     /**
2476      * Audio channel layout.
2477      * - encoding: set by user.
2478      * - decoding: set by libavcodec.
2479      */
2480     int64_t channel_layout;
2481
2482     /**
2483      * Request decoder to use this channel layout if it can (0 for default)
2484      * - encoding: unused
2485      * - decoding: Set by user.
2486      */
2487     int64_t request_channel_layout;
2488
2489     /**
2490      * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2491      * - encoding: Set by user.
2492      * - decoding: unused.
2493      */
2494     float rc_max_available_vbv_use;
2495
2496     /**
2497      * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2498      * - encoding: Set by user.
2499      * - decoding: unused.
2500      */
2501     float rc_min_vbv_overflow_use;
2502
2503     /**
2504      * Hardware accelerator in use
2505      * - encoding: unused.
2506      * - decoding: Set by libavcodec
2507      */
2508     struct AVHWAccel *hwaccel;
2509
2510     /**
2511      * For some codecs, the time base is closer to the field rate than the frame rate.
2512      * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2513      * if no telecine is used ...
2514      *
2515      * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2516      */
2517     int ticks_per_frame;
2518
2519     /**
2520      * Hardware accelerator context.
2521      * For some hardware accelerators, a global context needs to be
2522      * provided by the user. In that case, this holds display-dependent
2523      * data FFmpeg cannot instantiate itself. Please refer to the
2524      * FFmpeg HW accelerator documentation to know how to fill this
2525      * is. e.g. for VA API, this is a struct vaapi_context.
2526      * - encoding: unused
2527      * - decoding: Set by user
2528      */
2529     void *hwaccel_context;
2530
2531     /**
2532      * Chromaticity coordinates of the source primaries.
2533      * - encoding: Set by user
2534      * - decoding: Set by libavcodec
2535      */
2536     enum AVColorPrimaries color_primaries;
2537
2538     /**
2539      * Color Transfer Characteristic.
2540      * - encoding: Set by user
2541      * - decoding: Set by libavcodec
2542      */
2543     enum AVColorTransferCharacteristic color_trc;
2544
2545     /**
2546      * YUV colorspace type.
2547      * - encoding: Set by user
2548      * - decoding: Set by libavcodec
2549      */
2550     enum AVColorSpace colorspace;
2551
2552     /**
2553      * MPEG vs JPEG YUV range.
2554      * - encoding: Set by user
2555      * - decoding: Set by libavcodec
2556      */
2557     enum AVColorRange color_range;
2558
2559     /**
2560      * This defines the location of chroma samples.
2561      * - encoding: Set by user
2562      * - decoding: Set by libavcodec
2563      */
2564     enum AVChromaLocation chroma_sample_location;
2565
2566     /**
2567      * The codec may call this to execute several independent things.
2568      * It will return only after finishing all tasks.
2569      * The user may replace this with some multithreaded implementation,
2570      * the default implementation will execute the parts serially.
2571      * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2572      * @param c context passed also to func
2573      * @param count the number of things to execute
2574      * @param arg2 argument passed unchanged to func
2575      * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2576      * @param func function that will be called count times, with jobnr from 0 to count-1.
2577      *             threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2578      *             two instances of func executing at the same time will have the same threadnr.
2579      * @return always 0 currently, but code should handle a future improvement where when any call to func
2580      *         returns < 0 no further calls to func may be done and < 0 is returned.
2581      * - encoding: Set by libavcodec, user can override.
2582      * - decoding: Set by libavcodec, user can override.
2583      */
2584     int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2585
2586     /**
2587      * explicit P-frame weighted prediction analysis method
2588      * 0: off
2589      * 1: fast blind weighting (one reference duplicate with -1 offset)
2590      * 2: smart weighting (full fade detection analysis)
2591      * - encoding: Set by user.
2592      * - decoding: unused
2593      */
2594     int weighted_p_pred;
2595 } AVCodecContext;
2596
2597 /**
2598  * AVCodec.
2599  */
2600 typedef struct AVCodec {
2601     /**
2602      * Name of the codec implementation.
2603      * The name is globally unique among encoders and among decoders (but an
2604      * encoder and a decoder can share the same name).
2605      * This is the primary way to find a codec from the user perspective.
2606      */
2607     const char *name;
2608     enum CodecType type;
2609     enum CodecID id;
2610     int priv_data_size;
2611     int (*init)(AVCodecContext *);
2612     int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2613     int (*close)(AVCodecContext *);
2614     int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2615     /**
2616      * Codec capabilities.
2617      * see CODEC_CAP_*
2618      */
2619     int capabilities;
2620     struct AVCodec *next;
2621     /**
2622      * Flush buffers.
2623      * Will be called when seeking
2624      */
2625     void (*flush)(AVCodecContext *);
2626     const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2627     const enum PixelFormat *pix_fmts;       ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2628     /**
2629      * Descriptive name for the codec, meant to be more human readable than name.
2630      * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2631      */
2632     const char *long_name;
2633     const int *supported_samplerates;       ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2634     const enum SampleFormat *sample_fmts;   ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2635     const int64_t *channel_layouts;         ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2636 } AVCodec;
2637
2638 /**
2639  * AVHWAccel.
2640  */
2641 typedef struct AVHWAccel {
2642     /**
2643      * Name of the hardware accelerated codec.
2644      * The name is globally unique among encoders and among decoders (but an
2645      * encoder and a decoder can share the same name).
2646      */
2647     const char *name;
2648
2649     /**
2650      * Type of codec implemented by the hardware accelerator.
2651      *
2652      * See CODEC_TYPE_xxx
2653      */
2654     enum CodecType type;
2655
2656     /**
2657      * Codec implemented by the hardware accelerator.
2658      *
2659      * See CODEC_ID_xxx
2660      */
2661     enum CodecID id;
2662
2663     /**
2664      * Supported pixel format.
2665      *
2666      * Only hardware accelerated formats are supported here.
2667      */
2668     enum PixelFormat pix_fmt;
2669
2670     /**
2671      * Hardware accelerated codec capabilities.
2672      * see FF_HWACCEL_CODEC_CAP_*
2673      */
2674     int capabilities;
2675
2676     struct AVHWAccel *next;
2677
2678     /**
2679      * Called at the beginning of each frame or field picture.
2680      *
2681      * Meaningful frame information (codec specific) is guaranteed to
2682      * be parsed at this point. This function is mandatory.
2683      *
2684      * Note that buf can be NULL along with buf_size set to 0.
2685      * Otherwise, this means the whole frame is available at this point.
2686      *
2687      * @param avctx the codec context
2688      * @param buf the frame data buffer base
2689      * @param buf_size the size of the frame in bytes
2690      * @return zero if successful, a negative value otherwise
2691      */
2692     int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2693
2694     /**
2695      * Callback for each slice.
2696      *
2697      * Meaningful slice information (codec specific) is guaranteed to
2698      * be parsed at this point. This function is mandatory.
2699      *
2700      * @param avctx the codec context
2701      * @param buf the slice data buffer base
2702      * @param buf_size the size of the slice in bytes
2703      * @return zero if successful, a negative value otherwise
2704      */
2705     int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2706
2707     /**
2708      * Called at the end of each frame or field picture.
2709      *
2710      * The whole picture is parsed at this point and can now be sent
2711      * to the hardware accelerator. This function is mandatory.
2712      *
2713      * @param avctx the codec context
2714      * @return zero if successful, a negative value otherwise
2715      */
2716     int (*end_frame)(AVCodecContext *avctx);
2717
2718     /**
2719      * Size of HW accelerator private data.
2720      *
2721      * Private data is allocated with av_mallocz() before
2722      * AVCodecContext.get_buffer() and deallocated after
2723      * AVCodecContext.release_buffer().
2724      */
2725     int priv_data_size;
2726 } AVHWAccel;
2727
2728 /**
2729  * four components are given, that's all.
2730  * the last component is alpha
2731  */
2732 typedef struct AVPicture {
2733     uint8_t *data[4];
2734     int linesize[4];       ///< number of bytes per line
2735 } AVPicture;
2736
2737 #if LIBAVCODEC_VERSION_MAJOR < 53
2738 /**
2739  * AVPaletteControl
2740  * This structure defines a method for communicating palette changes
2741  * between and demuxer and a decoder.
2742  *
2743  * @deprecated Use AVPacket to send palette changes instead.
2744  * This is totally broken.
2745  */
2746 #define AVPALETTE_SIZE 1024
2747 #define AVPALETTE_COUNT 256
2748 typedef struct AVPaletteControl {
2749
2750     /* Demuxer sets this to 1 to indicate the palette has changed;
2751      * decoder resets to 0. */
2752     int palette_changed;
2753
2754     /* 4-byte ARGB palette entries, stored in native byte order; note that
2755      * the individual palette components should be on a 8-bit scale; if
2756      * the palette data comes from an IBM VGA native format, the component
2757      * data is probably 6 bits in size and needs to be scaled. */
2758     unsigned int palette[AVPALETTE_COUNT];
2759
2760 } AVPaletteControl attribute_deprecated;
2761 #endif
2762
2763 enum AVSubtitleType {
2764     SUBTITLE_NONE,
2765
2766     SUBTITLE_BITMAP,                ///< A bitmap, pict will be set
2767
2768     /**
2769      * Plain text, the text field must be set by the decoder and is
2770      * authoritative. ass and pict fields may contain approximations.
2771      */
2772     SUBTITLE_TEXT,
2773
2774     /**
2775      * Formatted text, the ass field must be set by the decoder and is
2776      * authoritative. pict and text fields may contain approximations.
2777      */
2778     SUBTITLE_ASS,
2779 };
2780
2781 typedef struct AVSubtitleRect {
2782     int x;         ///< top left corner  of pict, undefined when pict is not set
2783     int y;         ///< top left corner  of pict, undefined when pict is not set
2784     int w;         ///< width            of pict, undefined when pict is not set
2785     int h;         ///< height           of pict, undefined when pict is not set
2786     int nb_colors; ///< number of colors in pict, undefined when pict is not set
2787
2788     /**
2789      * data+linesize for the bitmap of this subtitle.
2790      * can be set for text/ass as well once they where rendered
2791      */
2792     AVPicture pict;
2793     enum AVSubtitleType type;
2794
2795     char *text;                     ///< 0 terminated plain UTF-8 text
2796
2797     /**
2798      * 0 terminated ASS/SSA compatible event line.
2799      * The pressentation of this is unaffected by the other values in this
2800      * struct.
2801      */
2802     char *ass;
2803 } AVSubtitleRect;
2804
2805 typedef struct AVSubtitle {
2806     uint16_t format; /* 0 = graphics */
2807     uint32_t start_display_time; /* relative to packet pts, in ms */
2808     uint32_t end_display_time; /* relative to packet pts, in ms */
2809     unsigned num_rects;
2810     AVSubtitleRect **rects;
2811     int64_t pts;    ///< Same as packet pts, in AV_TIME_BASE
2812 } AVSubtitle;
2813
2814 /* packet functions */
2815
2816 /**
2817  * @deprecated use NULL instead
2818  */
2819 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
2820
2821 /**
2822  * Default packet destructor.
2823  */
2824 void av_destruct_packet(AVPacket *pkt);
2825
2826 /**
2827  * Initialize optional fields of a packet with default values.
2828  *
2829  * @param pkt packet
2830  */
2831 void av_init_packet(AVPacket *pkt);
2832
2833 /**
2834  * Allocate the payload of a packet and initialize its fields with
2835  * default values.
2836  *
2837  * @param pkt packet
2838  * @param size wanted payload size
2839  * @return 0 if OK, AVERROR_xxx otherwise
2840  */
2841 int av_new_packet(AVPacket *pkt, int size);
2842
2843 /**
2844  * Reduce packet size, correctly zeroing padding
2845  *
2846  * @param pkt packet
2847  * @param size new size
2848  */
2849 void av_shrink_packet(AVPacket *pkt, int size);
2850
2851 /**
2852  * @warning This is a hack - the packet memory allocation stuff is broken. The
2853  * packet is allocated if it was not really allocated.
2854  */
2855 int av_dup_packet(AVPacket *pkt);
2856
2857 /**
2858  * Free a packet.
2859  *
2860  * @param pkt packet to free
2861  */
2862 void av_free_packet(AVPacket *pkt);
2863
2864 /* resample.c */
2865
2866 struct ReSampleContext;
2867 struct AVResampleContext;
2868
2869 typedef struct ReSampleContext ReSampleContext;
2870
2871 #if LIBAVCODEC_VERSION_MAJOR < 53
2872 /**
2873  * @deprecated Use av_audio_resample_init() instead.
2874  */
2875 attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
2876                                                           int output_rate, int input_rate);
2877 #endif
2878 /**
2879  *  Initializes audio resampling context
2880  *
2881  * @param output_channels  number of output channels
2882  * @param input_channels   number of input channels
2883  * @param output_rate      output sample rate
2884  * @param input_rate       input sample rate
2885  * @param sample_fmt_out   requested output sample format
2886  * @param sample_fmt_in    input sample format
2887  * @param filter_length    length of each FIR filter in the filterbank relative to the cutoff freq
2888  * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2889  * @param linear           If 1 then the used FIR filter will be linearly interpolated
2890                            between the 2 closest, if 0 the closest will be used
2891  * @param cutoff           cutoff frequency, 1.0 corresponds to half the output sampling rate
2892  * @return allocated ReSampleContext, NULL if error occured
2893  */
2894 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
2895                                         int output_rate, int input_rate,
2896                                         enum SampleFormat sample_fmt_out,
2897                                         enum SampleFormat sample_fmt_in,
2898                                         int filter_length, int log2_phase_count,
2899                                         int linear, double cutoff);
2900
2901 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
2902 void audio_resample_close(ReSampleContext *s);
2903
2904
2905 /**
2906  * Initializes an audio resampler.
2907  * Note, if either rate is not an integer then simply scale both rates up so they are.
2908  * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
2909  * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2910  * @param linear If 1 then the used FIR filter will be linearly interpolated
2911                  between the 2 closest, if 0 the closest will be used
2912  * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
2913  */
2914 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
2915
2916 /**
2917  * resamples.
2918  * @param src an array of unconsumed samples
2919  * @param consumed the number of samples of src which have been consumed are returned here
2920  * @param src_size the number of unconsumed samples available
2921  * @param dst_size the amount of space in samples available in dst
2922  * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
2923  * @return the number of samples written in dst or -1 if an error occurred
2924  */
2925 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
2926
2927
2928 /**
2929  * Compensates samplerate/timestamp drift. The compensation is done by changing
2930  * the resampler parameters, so no audible clicks or similar distortions occur
2931  * @param compensation_distance distance in output samples over which the compensation should be performed
2932  * @param sample_delta number of output samples which should be output less
2933  *
2934  * example: av_resample_compensate(c, 10, 500)
2935  * here instead of 510 samples only 500 samples would be output
2936  *
2937  * note, due to rounding the actual compensation might be slightly different,
2938  * especially if the compensation_distance is large and the in_rate used during init is small
2939  */
2940 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
2941 void av_resample_close(struct AVResampleContext *c);
2942
2943 /**
2944  * Allocate memory for a picture.  Call avpicture_free to free it.
2945  *
2946  * @param picture the picture to be filled in
2947  * @param pix_fmt the format of the picture
2948  * @param width the width of the picture
2949  * @param height the height of the picture
2950  * @return zero if successful, a negative value if not
2951  */
2952 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
2953
2954 /**
2955  * Free a picture previously allocated by avpicture_alloc().
2956  *
2957  * @param picture the AVPicture to be freed
2958  */
2959 void avpicture_free(AVPicture *picture);
2960
2961 /**
2962  * Fill in the AVPicture fields.
2963  * The fields of the given AVPicture are filled in by using the 'ptr' address
2964  * which points to the image data buffer. Depending on the specified picture
2965  * format, one or multiple image data pointers and line sizes will be set.
2966  * If a planar format is specified, several pointers will be set pointing to
2967  * the different picture planes and the line sizes of the different planes
2968  * will be stored in the lines_sizes array.
2969  * Call with ptr == NULL to get the required size for the ptr buffer.
2970  *
2971  * @param picture AVPicture whose fields are to be filled in
2972  * @param ptr Buffer which will contain or contains the actual image data
2973  * @param pix_fmt The format in which the picture data is stored.
2974  * @param width the width of the image in pixels
2975  * @param height the height of the image in pixels
2976  * @return size of the image data in bytes
2977  */
2978 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
2979                    enum PixelFormat pix_fmt, int width, int height);
2980 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
2981                      unsigned char *dest, int dest_size);
2982
2983 /**
2984  * Calculate the size in bytes that a picture of the given width and height
2985  * would occupy if stored in the given picture format.
2986  * Note that this returns the size of a compact representation as generated
2987  * by avpicture_layout, which can be smaller than the size required for e.g.
2988  * avpicture_fill.
2989  *
2990  * @param pix_fmt the given picture format
2991  * @param width the width of the image
2992  * @param height the height of the image
2993  * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
2994  */
2995 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
2996 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
2997 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
2998 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
2999
3000 #if LIBAVCODEC_VERSION_MAJOR < 53
3001 /**
3002  * Returns the pixel format corresponding to the name name.
3003  *
3004  * If there is no pixel format with name name, then looks for a
3005  * pixel format with the name corresponding to the native endian
3006  * format of name.
3007  * For example in a little-endian system, first looks for "gray16",
3008  * then for "gray16le".
3009  *
3010  * Finally if no pixel format has been found, returns PIX_FMT_NONE.
3011  *
3012  * @deprecated Deprecated in favor of av_get_pix_fmt().
3013  */
3014 attribute_deprecated enum PixelFormat avcodec_get_pix_fmt(const char* name);
3015 #endif
3016
3017 /**
3018  * Returns a value representing the fourCC code associated to the
3019  * pixel format pix_fmt, or 0 if no associated fourCC code can be
3020  * found.
3021  */
3022 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3023
3024 #define FF_LOSS_RESOLUTION  0x0001 /**< loss due to resolution change */
3025 #define FF_LOSS_DEPTH       0x0002 /**< loss due to color depth change */
3026 #define FF_LOSS_COLORSPACE  0x0004 /**< loss due to color space conversion */
3027 #define FF_LOSS_ALPHA       0x0008 /**< loss of alpha bits */
3028 #define FF_LOSS_COLORQUANT  0x0010 /**< loss due to color quantization */
3029 #define FF_LOSS_CHROMA      0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3030
3031 /**
3032  * Computes what kind of losses will occur when converting from one specific
3033  * pixel format to another.
3034  * When converting from one pixel format to another, information loss may occur.
3035  * For example, when converting from RGB24 to GRAY, the color information will
3036  * be lost. Similarly, other losses occur when converting from some formats to
3037  * other formats. These losses can involve loss of chroma, but also loss of
3038  * resolution, loss of color depth, loss due to the color space conversion, loss
3039  * of the alpha bits or loss due to color quantization.
3040  * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3041  * which will occur when converting from one pixel format to another.
3042  *
3043  * @param[in] dst_pix_fmt destination pixel format
3044  * @param[in] src_pix_fmt source pixel format
3045  * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3046  * @return Combination of flags informing you what kind of losses will occur.
3047  */
3048 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3049                              int has_alpha);
3050
3051 /**
3052  * Finds the best pixel format to convert to given a certain source pixel
3053  * format.  When converting from one pixel format to another, information loss
3054  * may occur.  For example, when converting from RGB24 to GRAY, the color
3055  * information will be lost. Similarly, other losses occur when converting from
3056  * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3057  * the given pixel formats should be used to suffer the least amount of loss.
3058  * The pixel formats from which it chooses one, are determined by the
3059  * pix_fmt_mask parameter.
3060  *
3061  * @code
3062  * src_pix_fmt = PIX_FMT_YUV420P;
3063  * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3064  * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3065  * @endcode
3066  *
3067  * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3068  * @param[in] src_pix_fmt source pixel format
3069  * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3070  * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3071  * @return The best pixel format to convert to or -1 if none was found.
3072  */
3073 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3074                               int has_alpha, int *loss_ptr);
3075
3076
3077 /**
3078  * Print in buf the string corresponding to the pixel format with
3079  * number pix_fmt, or an header if pix_fmt is negative.
3080  *
3081  * @param[in] buf the buffer where to write the string
3082  * @param[in] buf_size the size of buf
3083  * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
3084  * a negative value to print the corresponding header.
3085  * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
3086  */
3087 void avcodec_pix_fmt_string (char *buf, int buf_size, enum PixelFormat pix_fmt);
3088
3089 #define FF_ALPHA_TRANSP       0x0001 /* image has some totally transparent pixels */
3090 #define FF_ALPHA_SEMI_TRANSP  0x0002 /* image has some transparent pixels */
3091
3092 /**
3093  * Tell if an image really has transparent alpha values.
3094  * @return ored mask of FF_ALPHA_xxx constants
3095  */
3096 int img_get_alpha_info(const AVPicture *src,
3097                        enum PixelFormat pix_fmt, int width, int height);
3098
3099 /* deinterlace a picture */
3100 /* deinterlace - if not supported return -1 */
3101 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3102                           enum PixelFormat pix_fmt, int width, int height);
3103
3104 /* external high level API */
3105
3106 /**
3107  * If c is NULL, returns the first registered codec,
3108  * if c is non-NULL, returns the next registered codec after c,
3109  * or NULL if c is the last one.
3110  */
3111 AVCodec *av_codec_next(AVCodec *c);
3112
3113 /**
3114  * Returns the LIBAVCODEC_VERSION_INT constant.
3115  */
3116 unsigned avcodec_version(void);
3117
3118 /**
3119  * Returns the libavcodec build-time configuration.
3120  */
3121 const char *avcodec_configuration(void);
3122
3123 /**
3124  * Returns the libavcodec license.
3125  */
3126 const char *avcodec_license(void);
3127
3128 /**
3129  * Initializes libavcodec.
3130  *
3131  * @warning This function must be called before any other libavcodec
3132  * function.
3133  */
3134 void avcodec_init(void);
3135
3136 #if LIBAVCODEC_VERSION_MAJOR < 53
3137 /**
3138  * @deprecated Deprecated in favor of avcodec_register().
3139  */
3140 attribute_deprecated void register_avcodec(AVCodec *codec);
3141 #endif
3142
3143 /**
3144  * Register the codec codec and initialize libavcodec.
3145  *
3146  * @see avcodec_init()
3147  */
3148 void avcodec_register(AVCodec *codec);
3149
3150 /**
3151  * Finds a registered encoder with a matching codec ID.
3152  *
3153  * @param id CodecID of the requested encoder
3154  * @return An encoder if one was found, NULL otherwise.
3155  */
3156 AVCodec *avcodec_find_encoder(enum CodecID id);
3157
3158 /**
3159  * Finds a registered encoder with the specified name.
3160  *
3161  * @param name name of the requested encoder
3162  * @return An encoder if one was found, NULL otherwise.
3163  */
3164 AVCodec *avcodec_find_encoder_by_name(const char *name);
3165
3166 /**
3167  * Finds a registered decoder with a matching codec ID.
3168  *
3169  * @param id CodecID of the requested decoder
3170  * @return A decoder if one was found, NULL otherwise.
3171  */
3172 AVCodec *avcodec_find_decoder(enum CodecID id);
3173
3174 /**
3175  * Finds a registered decoder with the specified name.
3176  *
3177  * @param name name of the requested decoder
3178  * @return A decoder if one was found, NULL otherwise.
3179  */
3180 AVCodec *avcodec_find_decoder_by_name(const char *name);
3181 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3182
3183 /**
3184  * Sets the fields of the given AVCodecContext to default values.
3185  *
3186  * @param s The AVCodecContext of which the fields should be set to default values.
3187  */
3188 void avcodec_get_context_defaults(AVCodecContext *s);
3189
3190 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3191  *  we WILL change its arguments and name a few times! */
3192 void avcodec_get_context_defaults2(AVCodecContext *s, enum CodecType);
3193
3194 /**
3195  * Allocates an AVCodecContext and sets its fields to default values.  The
3196  * resulting struct can be deallocated by simply calling av_free().
3197  *
3198  * @return An AVCodecContext filled with default values or NULL on failure.
3199  * @see avcodec_get_context_defaults
3200  */
3201 AVCodecContext *avcodec_alloc_context(void);
3202
3203 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3204  *  we WILL change its arguments and name a few times! */
3205 AVCodecContext *avcodec_alloc_context2(enum CodecType);
3206
3207 /**
3208  * Sets the fields of the given AVFrame to default values.
3209  *
3210  * @param pic The AVFrame of which the fields should be set to default values.
3211  */
3212 void avcodec_get_frame_defaults(AVFrame *pic);
3213
3214 /**
3215  * Allocates an AVFrame and sets its fields to default values.  The resulting
3216  * struct can be deallocated by simply calling av_free().
3217  *
3218  * @return An AVFrame filled with default values or NULL on failure.
3219  * @see avcodec_get_frame_defaults
3220  */
3221 AVFrame *avcodec_alloc_frame(void);
3222
3223 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3224 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3225 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3226 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3227
3228 /**
3229  * Checks if the given dimension of a picture is valid, meaning that all
3230  * bytes of the picture can be addressed with a signed int.
3231  *
3232  * @param[in] w Width of the picture.
3233  * @param[in] h Height of the picture.
3234  * @return Zero if valid, a negative value if invalid.
3235  */
3236 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
3237 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3238
3239 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3240 void avcodec_thread_free(AVCodecContext *s);
3241 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3242 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3243 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3244 //FIXME func typedef
3245
3246 /**
3247  * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
3248  * function the context has to be allocated.
3249  *
3250  * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3251  * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3252  * retrieving a codec.
3253  *
3254  * @warning This function is not thread safe!
3255  *
3256  * @code
3257  * avcodec_register_all();
3258  * codec = avcodec_find_decoder(CODEC_ID_H264);
3259  * if (!codec)
3260  *     exit(1);
3261  *
3262  * context = avcodec_alloc_context();
3263  *
3264  * if (avcodec_open(context, codec) < 0)
3265  *     exit(1);
3266  * @endcode
3267  *
3268  * @param avctx The context which will be set up to use the given codec.
3269  * @param codec The codec to use within the context.
3270  * @return zero on success, a negative value on error
3271  * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3272  */
3273 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3274
3275 #if LIBAVCODEC_VERSION_MAJOR < 53
3276 /**
3277  * Decodes an audio frame from buf into samples.
3278  * Wrapper function which calls avcodec_decode_audio3.
3279  *
3280  * @deprecated Use avcodec_decode_audio3 instead.
3281  * @param avctx the codec context
3282  * @param[out] samples the output buffer
3283  * @param[in,out] frame_size_ptr the output buffer size in bytes
3284  * @param[in] buf the input buffer
3285  * @param[in] buf_size the input buffer size in bytes
3286  * @return On error a negative value is returned, otherwise the number of bytes
3287  * used or zero if no frame could be decompressed.
3288  */
3289 attribute_deprecated int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
3290                          int *frame_size_ptr,
3291                          const uint8_t *buf, int buf_size);
3292 #endif
3293
3294 /**
3295  * Decodes the audio frame of size avpkt->size from avpkt->data into samples.
3296  * Some decoders may support multiple frames in a single AVPacket, such
3297  * decoders would then just decode the first frame. In this case,
3298  * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3299  * the remaining data in order to decode the second frame etc.
3300  * If no frame
3301  * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3302  * decompressed frame size in bytes.
3303  *
3304  * @warning You must set frame_size_ptr to the allocated size of the
3305  * output buffer before calling avcodec_decode_audio3().
3306  *
3307  * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3308  * the actual read bytes because some optimized bitstream readers read 32 or 64
3309  * bits at once and could read over the end.
3310  *
3311  * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3312  * no overreading happens for damaged MPEG streams.
3313  *
3314  * @note You might have to align the input buffer avpkt->data and output buffer
3315  * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3316  * necessary at all, on others it won't work at all if not aligned and on others
3317  * it will work but it will have an impact on performance.
3318  *
3319  * In practice, avpkt->data should have 4 byte alignment at minimum and
3320  * samples should be 16 byte aligned unless the CPU doesn't need it
3321  * (AltiVec and SSE do).
3322  *
3323  * @param avctx the codec context
3324  * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3325  * @param[in,out] frame_size_ptr the output buffer size in bytes
3326  * @param[in] avpkt The input AVPacket containing the input buffer.
3327  *            You can create such packet with av_init_packet() and by then setting
3328  *            data and size, some decoders might in addition need other fields.
3329  *            All decoders are designed to use the least fields possible though.
3330  * @return On error a negative value is returned, otherwise the number of bytes
3331  * used or zero if no frame data was decompressed (used) from the input AVPacket.
3332  */
3333 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3334                          int *frame_size_ptr,
3335                          AVPacket *avpkt);
3336
3337 #if LIBAVCODEC_VERSION_MAJOR < 53
3338 /**
3339  * Decodes a video frame from buf into picture.
3340  * Wrapper function which calls avcodec_decode_video2.
3341  *
3342  * @deprecated Use avcodec_decode_video2 instead.
3343  * @param avctx the codec context
3344  * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3345  * @param[in] buf the input buffer
3346  * @param[in] buf_size the size of the input buffer in bytes
3347  * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3348  * @return On error a negative value is returned, otherwise the number of bytes
3349  * used or zero if no frame could be decompressed.
3350  */
3351 attribute_deprecated int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
3352                          int *got_picture_ptr,
3353                          const uint8_t *buf, int buf_size);
3354 #endif
3355
3356 /**
3357  * Decodes the video frame of size avpkt->size from avpkt->data into picture.
3358  * Some decoders may support multiple frames in a single AVPacket, such
3359  * decoders would then just decode the first frame.
3360  *
3361  * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3362  * the actual read bytes because some optimized bitstream readers read 32 or 64
3363  * bits at once and could read over the end.
3364  *
3365  * @warning The end of the input buffer buf should be set to 0 to ensure that
3366  * no overreading happens for damaged MPEG streams.
3367  *
3368  * @note You might have to align the input buffer avpkt->data.
3369  * The alignment requirements depend on the CPU: on some CPUs it isn't
3370  * necessary at all, on others it won't work at all if not aligned and on others
3371  * it will work but it will have an impact on performance.
3372  *
3373  * In practice, avpkt->data should have 4 byte alignment at minimum.
3374  *
3375  * @note Some codecs have a delay between input and output, these need to be
3376  * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3377  *
3378  * @param avctx the codec context
3379  * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3380  * @param[in] avpkt The input AVpacket containing the input buffer.
3381  *            You can create such packet with av_init_packet() and by then setting
3382  *            data and size, some decoders might in addition need other fields like
3383  *            flags&PKT_FLAG_KEY. All decoders are designed to use the least
3384  *            fields possible.
3385  * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3386  * @return On error a negative value is returned, otherwise the number of bytes
3387  * used or zero if no frame could be decompressed.
3388  */
3389 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3390                          int *got_picture_ptr,
3391                          AVPacket *avpkt);
3392
3393 #if LIBAVCODEC_VERSION_MAJOR < 53
3394 /* Decode a subtitle message. Return -1 if error, otherwise return the
3395  * number of bytes used. If no subtitle could be decompressed,
3396  * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3397 attribute_deprecated int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
3398                             int *got_sub_ptr,
3399                             const uint8_t *buf, int buf_size);
3400 #endif
3401
3402 /**
3403  * Decodes a subtitle message.
3404  * Returns a negative value on error, otherwise returns the number of bytes used.
3405  * If no subtitle could be decompressed, got_sub_ptr is zero.
3406  * Otherwise, the subtitle is stored in *sub.
3407  *
3408  * @param avctx the codec context
3409  * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored.
3410  * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3411  * @param[in] avpkt The input AVPacket containing the input buffer.
3412  */
3413 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3414                             int *got_sub_ptr,
3415                             AVPacket *avpkt);
3416 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3417                         int *data_size_ptr,
3418                         uint8_t *buf, int buf_size);
3419
3420 /**
3421  * Encodes an audio frame from samples into buf.
3422  *
3423  * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3424  * However, for PCM audio the user will know how much space is needed
3425  * because it depends on the value passed in buf_size as described
3426  * below. In that case a lower value can be used.
3427  *
3428  * @param avctx the codec context
3429  * @param[out] buf the output buffer
3430  * @param[in] buf_size the output buffer size
3431  * @param[in] samples the input buffer containing the samples
3432  * The number of samples read from this buffer is frame_size*channels,
3433  * both of which are defined in avctx.
3434  * For PCM audio the number of samples read from samples is equal to
3435  * buf_size * input_sample_size / output_sample_size.
3436  * @return On error a negative value is returned, on success zero or the number
3437  * of bytes used to encode the data read from the input buffer.
3438  */
3439 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3440                          const short *samples);
3441
3442 /**
3443  * Encodes a video frame from pict into buf.
3444  * The input picture should be
3445  * stored using a specific format, namely avctx.pix_fmt.
3446  *
3447  * @param avctx the codec context
3448  * @param[out] buf the output buffer for the bitstream of encoded frame
3449  * @param[in] buf_size the size of the output buffer in bytes
3450  * @param[in] pict the input picture to encode
3451  * @return On error a negative value is returned, on success zero or the number
3452  * of bytes used from the output buffer.
3453  */
3454 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3455                          const AVFrame *pict);
3456 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3457                             const AVSubtitle *sub);
3458
3459 int avcodec_close(AVCodecContext *avctx);
3460
3461 /**
3462  * Register all the codecs, parsers and bitstream filters which were enabled at
3463  * configuration time. If you do not call this function you can select exactly
3464  * which formats you want to support, by using the individual registration
3465  * functions.
3466  *
3467  * @see avcodec_register
3468  * @see av_register_codec_parser
3469  * @see av_register_bitstream_filter
3470  */
3471 void avcodec_register_all(void);
3472
3473 /**
3474  * Flush buffers, should be called when seeking or when switching to a different stream.
3475  */
3476 void avcodec_flush_buffers(AVCodecContext *avctx);
3477
3478 void avcodec_default_free_buffers(AVCodecContext *s);
3479
3480 /* misc useful functions */
3481
3482 /**
3483  * Returns a single letter to describe the given picture type pict_type.
3484  *
3485  * @param[in] pict_type the picture type
3486  * @return A single character representing the picture type.
3487  */
3488 char av_get_pict_type_char(int pict_type);
3489
3490 /**
3491  * Returns codec bits per sample.
3492  *
3493  * @param[in] codec_id the codec
3494  * @return Number of bits per sample or zero if unknown for the given codec.
3495  */
3496 int av_get_bits_per_sample(enum CodecID codec_id);
3497
3498 /**
3499  * Returns sample format bits per sample.
3500  *
3501  * @param[in] sample_fmt the sample format
3502  * @return Number of bits per sample or zero if unknown for the given sample format.
3503  */
3504 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
3505
3506 /* frame parsing */
3507 typedef struct AVCodecParserContext {
3508     void *priv_data;
3509     struct AVCodecParser *parser;
3510     int64_t frame_offset; /* offset of the current frame */
3511     int64_t cur_offset; /* current offset
3512                            (incremented by each av_parser_parse()) */
3513     int64_t next_frame_offset; /* offset of the next frame */
3514     /* video info */
3515     int pict_type; /* XXX: Put it back in AVCodecContext. */
3516     /**
3517      * This field is used for proper frame duration computation in lavf.
3518      * It signals, how much longer the frame duration of the current frame
3519      * is compared to normal frame duration.
3520      *
3521      * frame_duration = (1 + repeat_pict) * time_base
3522      *
3523      * It is used by codecs like H.264 to display telecined material.
3524      */
3525     int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3526     int64_t pts;     /* pts of the current frame */
3527     int64_t dts;     /* dts of the current frame */
3528
3529     /* private data */
3530     int64_t last_pts;
3531     int64_t last_dts;
3532     int fetch_timestamp;
3533
3534 #define AV_PARSER_PTS_NB 4
3535     int cur_frame_start_index;
3536     int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3537     int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3538     int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3539
3540     int flags;
3541 #define PARSER_FLAG_COMPLETE_FRAMES           0x0001
3542
3543     int64_t offset;      ///< byte offset from starting packet start
3544     int64_t cur_frame_end[AV_PARSER_PTS_NB];
3545
3546     /*!
3547      * Set by parser to 1 for key frames and 0 for non-key frames.
3548      * It is initialized to -1, so if the parser doesn't set this flag,
3549      * old-style fallback using FF_I_TYPE picture type as key frames
3550      * will be used.
3551      */
3552     int key_frame;
3553
3554     /**
3555      * Time difference in stream time base units from the pts of this
3556      * packet to the point at which the output from the decoder has converged
3557      * independent from the availability of previous frames. That is, the
3558      * frames are virtually identical no matter if decoding started from
3559      * the very first frame or from this keyframe.
3560      * Is AV_NOPTS_VALUE if unknown.
3561      * This field is not the display duration of the current frame.
3562      *
3563      * The purpose of this field is to allow seeking in streams that have no
3564      * keyframes in the conventional sense. It corresponds to the
3565      * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3566      * essential for some types of subtitle streams to ensure that all
3567      * subtitles are correctly displayed after seeking.
3568      */
3569     int64_t convergence_duration;
3570
3571     // Timestamp generation support:
3572     /**
3573      * Synchronization point for start of timestamp generation.
3574      *
3575      * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3576      * (default).
3577      *
3578      * For example, this corresponds to presence of H.264 buffering period
3579      * SEI message.
3580      */
3581     int dts_sync_point;
3582
3583     /**
3584      * Offset of the current timestamp against last timestamp sync point in
3585      * units of AVCodecContext.time_base.
3586      *
3587      * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3588      * contain a valid timestamp offset.
3589      *
3590      * Note that the timestamp of sync point has usually a nonzero
3591      * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3592      * the next frame after timestamp sync point will be usually 1.
3593      *
3594      * For example, this corresponds to H.264 cpb_removal_delay.
3595      */
3596     int dts_ref_dts_delta;
3597
3598     /**
3599      * Presentation delay of current frame in units of AVCodecContext.time_base.
3600      *
3601      * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3602      * contain valid non-negative timestamp delta (presentation time of a frame
3603      * must not lie in the past).
3604      *
3605      * This delay represents the difference between decoding and presentation
3606      * time of the frame.
3607      *
3608      * For example, this corresponds to H.264 dpb_output_delay.
3609      */
3610     int pts_dts_delta;
3611
3612     /**
3613      * Position of the packet in file.
3614      *
3615      * Analogous to cur_frame_pts/dts
3616      */
3617     int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3618
3619     /**
3620      * Byte position of currently parsed frame in stream.
3621      */
3622     int64_t pos;
3623
3624     /**
3625      * Previous frame byte position.
3626      */
3627     int64_t last_pos;
3628 } AVCodecParserContext;
3629
3630 typedef struct AVCodecParser {
3631     int codec_ids[5]; /* several codec IDs are permitted */
3632     int priv_data_size;
3633     int (*parser_init)(AVCodecParserContext *s);
3634     int (*parser_parse)(AVCodecParserContext *s,
3635                         AVCodecContext *avctx,
3636                         const uint8_t **poutbuf, int *poutbuf_size,
3637                         const uint8_t *buf, int buf_size);
3638     void (*parser_close)(AVCodecParserContext *s);
3639     int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3640     struct AVCodecParser *next;
3641 } AVCodecParser;
3642
3643 AVCodecParser *av_parser_next(AVCodecParser *c);
3644
3645 void av_register_codec_parser(AVCodecParser *parser);
3646 AVCodecParserContext *av_parser_init(int codec_id);
3647
3648 #if LIBAVCODEC_VERSION_MAJOR < 53
3649 attribute_deprecated
3650 int av_parser_parse(AVCodecParserContext *s,
3651                     AVCodecContext *avctx,
3652                     uint8_t **poutbuf, int *poutbuf_size,
3653                     const uint8_t *buf, int buf_size,
3654                     int64_t pts, int64_t dts);
3655 #endif
3656
3657 /**
3658  * Parse a packet.
3659  *
3660  * @param s             parser context.
3661  * @param avctx         codec context.
3662  * @param poutbuf       set to pointer to parsed buffer or NULL if not yet finished.
3663  * @param poutbuf_size  set to size of parsed buffer or zero if not yet finished.
3664  * @param buf           input buffer.
3665  * @param buf_size      input length, to signal EOF, this should be 0 (so that the last frame can be output).
3666  * @param pts           input presentation timestamp.
3667  * @param dts           input decoding timestamp.
3668  * @param pos           input byte position in stream.
3669  * @return the number of bytes of the input bitstream used.
3670  *
3671  * Example:
3672  * @code
3673  *   while(in_len){
3674  *       len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3675  *                                        in_data, in_len,
3676  *                                        pts, dts, pos);
3677  *       in_data += len;
3678  *       in_len  -= len;
3679  *
3680  *       if(size)
3681  *          decode_frame(data, size);
3682  *   }
3683  * @endcode
3684  */
3685 int av_parser_parse2(AVCodecParserContext *s,
3686                      AVCodecContext *avctx,
3687                      uint8_t **poutbuf, int *poutbuf_size,
3688                      const uint8_t *buf, int buf_size,
3689                      int64_t pts, int64_t dts,
3690                      int64_t pos);
3691
3692 int av_parser_change(AVCodecParserContext *s,
3693                      AVCodecContext *avctx,
3694                      uint8_t **poutbuf, int *poutbuf_size,
3695                      const uint8_t *buf, int buf_size, int keyframe);
3696 void av_parser_close(AVCodecParserContext *s);
3697
3698
3699 typedef struct AVBitStreamFilterContext {
3700     void *priv_data;
3701     struct AVBitStreamFilter *filter;
3702     AVCodecParserContext *parser;
3703     struct AVBitStreamFilterContext *next;
3704 } AVBitStreamFilterContext;
3705
3706
3707 typedef struct AVBitStreamFilter {
3708     const char *name;
3709     int priv_data_size;
3710     int (*filter)(AVBitStreamFilterContext *bsfc,
3711                   AVCodecContext *avctx, const char *args,
3712                   uint8_t **poutbuf, int *poutbuf_size,
3713                   const uint8_t *buf, int buf_size, int keyframe);
3714     void (*close)(AVBitStreamFilterContext *bsfc);
3715     struct AVBitStreamFilter *next;
3716 } AVBitStreamFilter;
3717
3718 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3719 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3720 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3721                                AVCodecContext *avctx, const char *args,
3722                                uint8_t **poutbuf, int *poutbuf_size,
3723                                const uint8_t *buf, int buf_size, int keyframe);
3724 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3725
3726 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
3727
3728 /* memory */
3729
3730 /**
3731  * Reallocates the given block if it is not large enough, otherwise it
3732  * does nothing.
3733  *
3734  * @see av_realloc
3735  */
3736 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
3737
3738 /**
3739  * Allocates a buffer, reusing the given one if large enough.
3740  *
3741  * Contrary to av_fast_realloc the current buffer contents might not be
3742  * preserved and on error the old buffer is freed, thus no special
3743  * handling to avoid memleaks is necessary.
3744  *
3745  * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
3746  * @param size size of the buffer *ptr points to
3747  * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
3748  *                 *size 0 if an error occurred.
3749  */
3750 void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size);
3751
3752 /**
3753  * Copy image 'src' to 'dst'.
3754  */
3755 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3756                      enum PixelFormat pix_fmt, int width, int height);
3757
3758 /**
3759  * Crop image top and left side.
3760  */
3761 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3762                     enum PixelFormat pix_fmt, int top_band, int left_band);
3763
3764 /**
3765  * Pad image.
3766  */
3767 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
3768             int padtop, int padbottom, int padleft, int padright, int *color);
3769
3770 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
3771
3772 /**
3