libavformat/raw.c

   1 /*
   2  * RAW encoder and decoder
   3  * Copyright (c) 2001 Fabrice Bellard.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19 #include "avformat.h"
  20
  21 /* simple formats */
  22 static int raw_write_header(struct AVFormatContext *s)
  23 {
  24     return 0;
  25 }
  26
  27 static int raw_write_packet(struct AVFormatContext *s, int stream_index,
  28                             unsigned char *buf, int size, int force_pts)
  29 {
  30     put_buffer(&s->pb, buf, size);
  31     put_flush_packet(&s->pb);
  32     return 0;
  33 }
  34
  35 static int raw_write_trailer(struct AVFormatContext *s)
  36 {
  37     return 0;
  38 }
  39
  40 /* raw input */
  41 static int raw_read_header(AVFormatContext *s, AVFormatParameters *ap)
  42 {
  43     AVStream *st;
  44     int id;
  45
  46     st = av_new_stream(s, 0);
  47     if (!st)
  48         return AVERROR_NOMEM;
  49     if (ap) {
  50         id = s->iformat->value;
  51         if (id == CODEC_ID_RAWVIDEO) {
  52             st->codec.codec_type = CODEC_TYPE_VIDEO;
  53         } else {
  54             st->codec.codec_type = CODEC_TYPE_AUDIO;
  55         }
  56         st->codec.codec_id = id;
  57
  58         switch(st->codec.codec_type) {
  59         case CODEC_TYPE_AUDIO:
  60             st->codec.sample_rate = ap->sample_rate;
  61             st->codec.channels = ap->channels;
  62             break;
  63         case CODEC_TYPE_VIDEO:
  64             st->codec.frame_rate      = ap->frame_rate;
  65             st->codec.frame_rate_base = ap->frame_rate_base;
  66             st->codec.width = ap->width;
  67             st->codec.height = ap->height;
  68             st->codec.pix_fmt = ap->pix_fmt;
  69             break;
  70         default:
  71             return -1;
  72         }
  73     } else {
  74         return -1;
  75     }
  76     return 0;
  77 }
  78
  79 #define RAW_PACKET_SIZE 1024
  80
  81 static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
  82 {
  83     int ret, size;
  84     //    AVStream *st = s->streams[0];
  85
  86     size= RAW_PACKET_SIZE;
  87
  88     if (av_new_packet(pkt, size) < 0)
  89         return -EIO;
  90
  91     pkt->stream_index = 0;
  92     ret = get_buffer(&s->pb, pkt->data, size);
  93     if (ret <= 0) {
  94         av_free_packet(pkt);
  95         return -EIO;
  96     }
  97     /* note: we need to modify the packet size here to handle the last
  98        packet */
  99     pkt->size = ret;
 100     return ret;
 101 }
 102
 103 static int raw_read_close(AVFormatContext *s)
 104 {
 105     return 0;
 106 }
 107
 108 /* ac3 read */
 109 static int ac3_read_header(AVFormatContext *s,
 110                            AVFormatParameters *ap)
 111 {
 112     AVStream *st;
 113
 114     st = av_new_stream(s, 0);
 115     if (!st)
 116         return AVERROR_NOMEM;
 117
 118     st->codec.codec_type = CODEC_TYPE_AUDIO;
 119     st->codec.codec_id = CODEC_ID_AC3;
 120     /* the parameters will be extracted from the compressed bitstream */
 121     return 0;
 122 }
 123
 124 /* mpeg1/h263 input */
 125 static int video_read_header(AVFormatContext *s,
 126                              AVFormatParameters *ap)
 127 {
 128     AVStream *st;
 129
 130     st = av_new_stream(s, 0);
 131     if (!st)
 132         return AVERROR_NOMEM;
 133
 134     st->codec.codec_type = CODEC_TYPE_VIDEO;
 135     st->codec.codec_id = s->iformat->value;
 136     /* for mjpeg, specify frame rate */
 137     /* for mpeg4 specify it too (most mpeg4 streams dont have the fixed_vop_rate set ...)*/
 138     if (st->codec.codec_id == CODEC_ID_MJPEG || st->codec.codec_id == CODEC_ID_MPEG4) {
 139         if (ap) {
 140             st->codec.frame_rate      = ap->frame_rate;
 141             st->codec.frame_rate_base = ap->frame_rate_base;
 142         } else {
 143             st->codec.frame_rate      = 25;
 144             st->codec.frame_rate_base = 1;
 145         }
 146     }
 147     return 0;
 148 }
 149
 150 #define SEQ_START_CODE          0x000001b3
 151 #define GOP_START_CODE          0x000001b8
 152 #define PICTURE_START_CODE      0x00000100
 153
 154 /* XXX: improve that by looking at several start codes */
 155 static int mpegvideo_probe(AVProbeData *p)
 156 {
 157     int code;
 158     const uint8_t *d;
 159
 160     /* we search the first start code. If it is a sequence, gop or
 161        picture start code then we decide it is an mpeg video
 162        stream. We do not send highest value to give a chance to mpegts */
 163     /* NOTE: the search range was restricted to avoid too many false
 164        detections */
 165
 166     if (p->buf_size < 6)
 167         return 0;
 168     d = p->buf;
 169     code = (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | (d[3]);
 170     if ((code & 0xffffff00) == 0x100) {
 171         if (code == SEQ_START_CODE ||
 172             code == GOP_START_CODE ||
 173             code == PICTURE_START_CODE)
 174             return 50 - 1;
 175         else
 176             return 0;
 177     }
 178     return 0;
 179 }
 180
 181 static int h263_probe(AVProbeData *p)
 182 {
 183     int code;
 184     const uint8_t *d;
 185
 186     if (p->buf_size < 6)
 187         return 0;
 188     d = p->buf;
 189     code = (d[0] << 14) | (d[1] << 6) | (d[2] >> 2);
 190     if (code == 0x20) {
 191         return 50;
 192     }
 193     return 0;
 194 }
 195
 196 AVInputFormat ac3_iformat = {
 197     "ac3",
 198     "raw ac3",
 199     0,
 200     NULL,
 201     ac3_read_header,
 202     raw_read_packet,
 203     raw_read_close,
 204     .extensions = "ac3",
 205 };
 206
 207 AVOutputFormat ac3_oformat = {
 208     "ac3",
 209     "raw ac3",
 210     "audio/x-ac3",
 211     "ac3",
 212     0,
 213     CODEC_ID_AC3,
 214     0,
 215     raw_write_header,
 216     raw_write_packet,
 217     raw_write_trailer,
 218 };
 219
 220 AVInputFormat h263_iformat = {
 221     "h263",
 222     "raw h263",
 223     0,
 224     h263_probe,
 225     video_read_header,
 226     raw_read_packet,
 227     raw_read_close,
 228 //    .extensions = "h263", //FIXME remove after writing mpeg4_probe
 229     .value = CODEC_ID_H263,
 230 };
 231
 232 AVOutputFormat h263_oformat = {
 233     "h263",
 234     "raw h263",
 235     "video/x-h263",
 236     "h263",
 237     0,
 238     0,
 239     CODEC_ID_H263,
 240     raw_write_header,
 241     raw_write_packet,
 242     raw_write_trailer,
 243 };
 244
 245 AVInputFormat m4v_iformat = {
 246     "m4v",
 247     "raw MPEG4 video format",
 248     0,
 249     NULL /*mpegvideo_probe*/,
 250     video_read_header,
 251     raw_read_packet,
 252     raw_read_close,
 253     .extensions = "m4v", //FIXME remove after writing mpeg4_probe
 254     .value = CODEC_ID_MPEG4,
 255 };
 256
 257 AVOutputFormat m4v_oformat = {
 258     "m4v",
 259     "raw MPEG4 video format",
 260     NULL,
 261     "m4v",
 262     0,
 263     CODEC_ID_NONE,
 264     CODEC_ID_MPEG4,
 265     raw_write_header,
 266     raw_write_packet,
 267     raw_write_trailer,
 268 };
 269
 270 AVInputFormat h264_iformat = {
 271     "h264",
 272     "raw H264 video format",
 273     0,
 274     NULL /*mpegvideo_probe*/,
 275     video_read_header,
 276     raw_read_packet,
 277     raw_read_close,
 278     .extensions = "h26l,h264", //FIXME remove after writing mpeg4_probe
 279     .value = CODEC_ID_H264,
 280 };
 281
 282 AVOutputFormat h264_oformat = {
 283     "h264",
 284     "raw H264 video format",
 285     NULL,
 286     "h264",
 287     0,
 288     CODEC_ID_NONE,
 289     CODEC_ID_H264,
 290     raw_write_header,
 291     raw_write_packet,
 292     raw_write_trailer,
 293 };
 294
 295 AVInputFormat mpegvideo_iformat = {
 296     "mpegvideo",
 297     "MPEG video",
 298     0,
 299     mpegvideo_probe,
 300     video_read_header,
 301     raw_read_packet,
 302     raw_read_close,
 303     .value = CODEC_ID_MPEG1VIDEO,
 304 };
 305
 306 AVOutputFormat mpeg1video_oformat = {
 307     "mpeg1video",
 308     "MPEG video",
 309     "video/x-mpeg",
 310     "mpg,mpeg",
 311     0,
 312     0,
 313     CODEC_ID_MPEG1VIDEO,
 314     raw_write_header,
 315     raw_write_packet,
 316     raw_write_trailer,
 317 };
 318
 319 AVInputFormat mjpeg_iformat = {
 320     "mjpeg",
 321     "MJPEG video",
 322     0,
 323     NULL,
 324     video_read_header,
 325     raw_read_packet,
 326     raw_read_close,
 327     .extensions = "mjpg,mjpeg",
 328     .value = CODEC_ID_MJPEG,
 329 };
 330
 331 AVOutputFormat mjpeg_oformat = {
 332     "mjpeg",
 333     "MJPEG video",
 334     "video/x-mjpeg",
 335     "mjpg,mjpeg",
 336     0,
 337     0,
 338     CODEC_ID_MJPEG,
 339     raw_write_header,
 340     raw_write_packet,
 341     raw_write_trailer,
 342 };
 343
 344 /* pcm formats */
 345
 346 #define PCMDEF(name, long_name, ext, codec) \
 347 AVInputFormat pcm_ ## name ## _iformat = {\
 348     #name,\
 349     long_name,\
 350     0,\
 351     NULL,\
 352     raw_read_header,\
 353     raw_read_packet,\
 354     raw_read_close,\
 355     .extensions = ext,\
 356     .value = codec,\
 357 };\
 358 \
 359 AVOutputFormat pcm_ ## name ## _oformat = {\
 360     #name,\
 361     long_name,\
 362     NULL,\
 363     ext,\
 364     0,\
 365     codec,\
 366     0,\
 367     raw_write_header,\
 368     raw_write_packet,\
 369     raw_write_trailer,\
 370 };
 371
 372 #ifdef WORDS_BIGENDIAN
 373 #define BE_DEF(s) s
 374 #define LE_DEF(s) NULL
 375 #else
 376 #define BE_DEF(s) NULL
 377 #define LE_DEF(s) s
 378 #endif
 379
 380
 381 PCMDEF(s16le, "pcm signed 16 bit little endian format",
 382        LE_DEF("sw"), CODEC_ID_PCM_S16LE)
 383
 384 PCMDEF(s16be, "pcm signed 16 bit big endian format",
 385        BE_DEF("sw"), CODEC_ID_PCM_S16BE)
 386
 387 PCMDEF(u16le, "pcm unsigned 16 bit little endian format",
 388        LE_DEF("uw"), CODEC_ID_PCM_U16LE)
 389
 390 PCMDEF(u16be, "pcm unsigned 16 bit big endian format",
 391        BE_DEF("uw"), CODEC_ID_PCM_U16BE)
 392
 393 PCMDEF(s8, "pcm signed 8 bit format",
 394        "sb", CODEC_ID_PCM_S8)
 395
 396 PCMDEF(u8, "pcm unsigned 8 bit format",
 397        "ub", CODEC_ID_PCM_U8)
 398
 399 PCMDEF(mulaw, "pcm mu law format",
 400        "ul", CODEC_ID_PCM_MULAW)
 401
 402 PCMDEF(alaw, "pcm A law format",
 403        "al", CODEC_ID_PCM_ALAW)
 404
 405 static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
 406 {
 407     int packet_size, ret, width, height;
 408     AVStream *st = s->streams[0];
 409
 410     width = st->codec.width;
 411     height = st->codec.height;
 412
 413     packet_size = avpicture_get_size(st->codec.pix_fmt, width, height);
 414     if (packet_size < 0)
 415         av_abort();
 416
 417     if (av_new_packet(pkt, packet_size) < 0)
 418         return -EIO;
 419
 420     pkt->stream_index = 0;
 421 #if 0
 422     /* bypass buffered I/O */
 423     ret = url_read(url_fileno(&s->pb), pkt->data, pkt->size);
 424 #else
 425     ret = get_buffer(&s->pb, pkt->data, pkt->size);
 426 #endif
 427     if (ret != pkt->size) {
 428         av_free_packet(pkt);
 429         return -EIO;
 430     } else {
 431         return 0;
 432     }
 433 }
 434
 435 AVInputFormat rawvideo_iformat = {
 436     "rawvideo",
 437     "raw video format",
 438     0,
 439     NULL,
 440     raw_read_header,
 441     rawvideo_read_packet,
 442     raw_read_close,
 443     .extensions = "yuv",
 444     .value = CODEC_ID_RAWVIDEO,
 445 };
 446
 447 AVOutputFormat rawvideo_oformat = {
 448     "rawvideo",
 449     "raw video format",
 450     NULL,
 451     "yuv",
 452     0,
 453     CODEC_ID_NONE,
 454     CODEC_ID_RAWVIDEO,
 455     raw_write_header,
 456     raw_write_packet,
 457     raw_write_trailer,
 458 };
 459
 460 static int null_write_packet(struct AVFormatContext *s,
 461                              int stream_index,
 462                              unsigned char *buf, int size, int force_pts)
 463 {
 464     return 0;
 465 }
 466
 467 AVOutputFormat null_oformat = {
 468     "null",
 469     "null video format",
 470     NULL,
 471     NULL,
 472     0,
 473 #ifdef WORDS_BIGENDIAN
 474     CODEC_ID_PCM_S16BE,
 475 #else
 476     CODEC_ID_PCM_S16LE,
 477 #endif
 478     CODEC_ID_RAWVIDEO,
 479     raw_write_header,
 480     null_write_packet,
 481     raw_write_trailer,
 482     .flags = AVFMT_NOFILE | AVFMT_RAWPICTURE,
 483 };
 484
 485 int raw_init(void)
 486 {
 487     av_register_input_format(&ac3_iformat);
 488     av_register_output_format(&ac3_oformat);
 489
 490     av_register_input_format(&h263_iformat);
 491     av_register_output_format(&h263_oformat);
 492
 493     av_register_input_format(&m4v_iformat);
 494     av_register_output_format(&m4v_oformat);
 495
 496     av_register_input_format(&h264_iformat);
 497     av_register_output_format(&h264_oformat);
 498
 499     av_register_input_format(&mpegvideo_iformat);
 500     av_register_output_format(&mpeg1video_oformat);
 501
 502     av_register_input_format(&mjpeg_iformat);
 503     av_register_output_format(&mjpeg_oformat);
 504
 505     av_register_input_format(&pcm_s16le_iformat);
 506     av_register_output_format(&pcm_s16le_oformat);
 507     av_register_input_format(&pcm_s16be_iformat);
 508     av_register_output_format(&pcm_s16be_oformat);
 509     av_register_input_format(&pcm_u16le_iformat);
 510     av_register_output_format(&pcm_u16le_oformat);
 511     av_register_input_format(&pcm_u16be_iformat);
 512     av_register_output_format(&pcm_u16be_oformat);
 513     av_register_input_format(&pcm_s8_iformat);
 514     av_register_output_format(&pcm_s8_oformat);
 515     av_register_input_format(&pcm_u8_iformat);
 516     av_register_output_format(&pcm_u8_oformat);
 517     av_register_input_format(&pcm_mulaw_iformat);
 518     av_register_output_format(&pcm_mulaw_oformat);
 519     av_register_input_format(&pcm_alaw_iformat);
 520     av_register_output_format(&pcm_alaw_oformat);
 521
 522     av_register_input_format(&rawvideo_iformat);
 523     av_register_output_format(&rawvideo_oformat);
 524
 525     av_register_output_format(&null_oformat);
 526     return 0;
 527 }