Remove some unused variables.
[libav.git] / libavformat / avformat.h
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1/*
2 * copyright (c) 2001 Fabrice Bellard
3 *
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4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
b78e7197 9 * version 2.1 of the License, or (at your option) any later version.
04d7f601 10 *
b78e7197 11 * FFmpeg is distributed in the hope that it will be useful,
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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
b78e7197 17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
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21#ifndef AVFORMAT_H
22#define AVFORMAT_H
de6d9b64 23
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24#ifdef __cplusplus
25extern "C" {
26#endif
27
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28#define LIBAVFORMAT_VERSION_INT ((51<<16)+(6<<8)+0)
29#define LIBAVFORMAT_VERSION 51.6.0
5aa083ee 30#define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
8026c3b5 31
5aa083ee 32#define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
4b1f4f23 33
f71869a4 34#include <time.h>
67070e4f 35#include <stdio.h> /* FILE */
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36#include "avcodec.h"
37
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38#include "avio.h"
39
40/* packet functions */
41
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42#ifndef MAXINT64
43#define MAXINT64 int64_t_C(0x7fffffffffffffff)
44#endif
45
46#ifndef MININT64
47#define MININT64 int64_t_C(0x8000000000000000)
48#endif
49
de6d9b64 50typedef struct AVPacket {
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51 int64_t pts; ///< presentation time stamp in time_base units
52 int64_t dts; ///< decompression time stamp in time_base units
0c1a9eda 53 uint8_t *data;
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54 int size;
55 int stream_index;
56 int flags;
2692067a 57 int duration; ///< presentation duration in time_base units (0 if not available)
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58 void (*destruct)(struct AVPacket *);
59 void *priv;
2692067a 60 int64_t pos; ///< byte position in stream, -1 if unknown
115329f1 61} AVPacket;
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62#define PKT_FLAG_KEY 0x0001
63
63dd1377 64void av_destruct_packet_nofree(AVPacket *pkt);
90ad92b3 65void av_destruct_packet(AVPacket *pkt);
63dd1377 66
da24c5e3 67/* initialize optional fields of a packet */
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68static inline void av_init_packet(AVPacket *pkt)
69{
70 pkt->pts = AV_NOPTS_VALUE;
fb2758c8 71 pkt->dts = AV_NOPTS_VALUE;
2692067a 72 pkt->pos = -1;
fb2758c8 73 pkt->duration = 0;
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74 pkt->flags = 0;
75 pkt->stream_index = 0;
63dd1377 76 pkt->destruct= av_destruct_packet_nofree;
6fa5a56c 77}
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78
79int av_new_packet(AVPacket *pkt, int size);
2692067a 80int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
fb2758c8 81int av_dup_packet(AVPacket *pkt);
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82
83/**
84 * Free a packet
85 *
86 * @param pkt packet to free
87 */
88static inline void av_free_packet(AVPacket *pkt)
89{
342474ab 90 if (pkt && pkt->destruct) {
bb270c08 91 pkt->destruct(pkt);
342474ab 92 }
6fa5a56c 93}
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94
95/*************************************************/
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96/* fractional numbers for exact pts handling */
97
98/* the exact value of the fractional number is: 'val + num / den'. num
99 is assumed to be such as 0 <= num < den */
100typedef struct AVFrac {
115329f1 101 int64_t val, num, den;
955ab9a4 102} AVFrac attribute_deprecated;
916c80e9 103
916c80e9 104/*************************************************/
b9a281db 105/* input/output formats */
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106
107struct AVFormatContext;
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108
109/* this structure contains the data a format has to probe a file */
110typedef struct AVProbeData {
5c91a675 111 const char *filename;
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112 unsigned char *buf;
113 int buf_size;
114} AVProbeData;
115
0288a747 116#define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
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117
118typedef struct AVFormatParameters {
c0df9d75 119 AVRational time_base;
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120 int sample_rate;
121 int channels;
122 int width;
123 int height;
4606ac8d 124 enum PixelFormat pix_fmt;
7f172339 125 int channel; /* used to select dv channel */
6beefa40 126 const char *device; /* video, audio or DV device */
e3ee3283 127 const char *standard; /* tv standard, NTSC, PAL, SECAM */
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128 int mpeg2ts_raw:1; /* force raw MPEG2 transport stream output, if possible */
129 int mpeg2ts_compute_pcr:1; /* compute exact PCR for each transport
130 stream packet (only meaningful if
131 mpeg2ts_raw is TRUE */
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132 int initial_pause:1; /* do not begin to play the stream
133 immediately (RTSP only) */
4eb72c6b 134 int prealloced_context:1;
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135 enum CodecID video_codec_id;
136 enum CodecID audio_codec_id;
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137} AVFormatParameters;
138
b9a281db 139#define AVFMT_NOFILE 0x0001 /* no file should be opened */
115329f1 140#define AVFMT_NEEDNUMBER 0x0002 /* needs '%d' in filename */
b9a281db 141#define AVFMT_SHOW_IDS 0x0008 /* show format stream IDs numbers */
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142#define AVFMT_RAWPICTURE 0x0020 /* format wants AVPicture structure for
143 raw picture data */
c64d476c 144#define AVFMT_GLOBALHEADER 0x0040 /* format wants global header */
494bbf58 145#define AVFMT_NOTIMESTAMPS 0x0080 /* format doesnt need / has any timestamps */
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146
147typedef struct AVOutputFormat {
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148 const char *name;
149 const char *long_name;
150 const char *mime_type;
151 const char *extensions; /* comma separated extensions */
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152 /* size of private data so that it can be allocated in the wrapper */
153 int priv_data_size;
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154 /* output support */
155 enum CodecID audio_codec; /* default audio codec */
156 enum CodecID video_codec; /* default video codec */
157 int (*write_header)(struct AVFormatContext *);
e928649b 158 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 159 int (*write_trailer)(struct AVFormatContext *);
c64d476c 160 /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
b9a281db 161 int flags;
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162 /* currently only used to set pixel format if not YUV420P */
163 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
fe2d6fe2 164 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
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165 /* private fields */
166 struct AVOutputFormat *next;
167} AVOutputFormat;
de6d9b64 168
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169typedef struct AVInputFormat {
170 const char *name;
171 const char *long_name;
172 /* size of private data so that it can be allocated in the wrapper */
173 int priv_data_size;
174 /* tell if a given file has a chance of being parsing by this format */
175 int (*read_probe)(AVProbeData *);
176 /* read the format header and initialize the AVFormatContext
de6d9b64 177 structure. Return 0 if OK. 'ap' if non NULL contains
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178 additionnal paramters. Only used in raw format right
179 now. 'av_new_stream' should be called to create new streams. */
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180 int (*read_header)(struct AVFormatContext *,
181 AVFormatParameters *ap);
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182 /* read one packet and put it in 'pkt'. pts and flags are also
183 set. 'av_new_stream' can be called only if the flag
da24c5e3 184 AVFMTCTX_NOHEADER is used. */
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185 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
186 /* close the stream. The AVFormatContext and AVStreams are not
187 freed by this function */
188 int (*read_close)(struct AVFormatContext *);
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189 /**
190 * seek to a given timestamp relative to the frames in
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191 * stream component stream_index
192 * @param stream_index must not be -1
115329f1 193 * @param flags selects which direction should be preferred if no exact
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194 * match is available
195 */
115329f1 196 int (*read_seek)(struct AVFormatContext *,
3ba1438d 197 int stream_index, int64_t timestamp, int flags);
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198 /**
199 * gets the next timestamp in AV_TIME_BASE units.
200 */
201 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
202 int64_t *pos, int64_t pos_limit);
da24c5e3 203 /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
de6d9b64 204 int flags;
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205 /* if extensions are defined, then no probe is done. You should
206 usually not use extension format guessing because it is not
207 reliable enough */
208 const char *extensions;
209 /* general purpose read only value that the format can use */
210 int value;
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211
212 /* start/resume playing - only meaningful if using a network based format
213 (RTSP) */
214 int (*read_play)(struct AVFormatContext *);
215
216 /* pause playing - only meaningful if using a network based format
217 (RTSP) */
218 int (*read_pause)(struct AVFormatContext *);
219
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220 /* private fields */
221 struct AVInputFormat *next;
222} AVInputFormat;
de6d9b64 223
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224typedef struct AVIndexEntry {
225 int64_t pos;
226 int64_t timestamp;
227#define AVINDEX_KEYFRAME 0x0001
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228 int flags:2;
229 int size:30; //yeah trying to keep the size of this small to reduce memory requirements (its 24 vs 32 byte due to possible 8byte align)
3e9245a9 230 int min_distance; /* min distance between this and the previous keyframe, used to avoid unneeded searching */
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231} AVIndexEntry;
232
de6d9b64 233typedef struct AVStream {
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234 int index; /* stream index in AVFormatContext */
235 int id; /* format specific stream id */
01f4895c 236 AVCodecContext *codec; /* codec context */
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237 /**
238 * real base frame rate of the stream.
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239 * this is the lowest framerate with which all timestamps can be
240 * represented accurately (its the least common multiple of all
241 * framerates in the stream), Note, this value is just a guess!
115329f1 242 * for example if the timebase is 1/90000 and all frames have either
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243 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
244 */
245 AVRational r_frame_rate;
de6d9b64 246 void *priv_data;
b9a281db 247 /* internal data used in av_find_stream_info() */
115329f1 248 int64_t codec_info_duration;
fb2758c8 249 int codec_info_nb_frames;
da24c5e3 250 /* encoding: PTS generation when outputing stream */
1e51d801 251 AVFrac pts;
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252
253 /**
254 * this is the fundamental unit of time (in seconds) in terms
255 * of which frame timestamps are represented. for fixed-fps content,
256 * timebase should be 1/framerate and timestamp increments should be
257 * identically 1.
258 */
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259 AVRational time_base;
260 int pts_wrap_bits; /* number of bits in pts (used for wrapping control) */
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261 /* ffmpeg.c private use */
262 int stream_copy; /* if TRUE, just copy stream */
f3356e9c 263 enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
b4aea108 264 //FIXME move stuff to a flags field?
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265 /* quality, as it has been removed from AVCodecContext and put in AVVideoFrame
266 * MN:dunno if thats the right place, for it */
115329f1 267 float quality;
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268 /* decoding: position of the first frame of the component, in
269 AV_TIME_BASE fractional seconds. */
115329f1 270 int64_t start_time;
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271 /* decoding: duration of the stream, in AV_TIME_BASE fractional
272 seconds. */
273 int64_t duration;
fb2758c8 274
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275 char language[4]; /* ISO 639 3-letter language code (empty string if undefined) */
276
fb2758c8 277 /* av_read_frame() support */
7cbaa7ba 278 int need_parsing; ///< 1->full parsing needed, 2->only parse headers dont repack
fb2758c8 279 struct AVCodecParserContext *parser;
6ec87caa 280
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281 int64_t cur_dts;
282 int last_IP_duration;
77405fc8 283 int64_t last_IP_pts;
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284 /* av_seek_frame() support */
285 AVIndexEntry *index_entries; /* only used if the format does not
286 support seeking natively */
287 int nb_index_entries;
191e8ca7 288 unsigned int index_entries_allocated_size;
115329f1 289
b4b87d48 290 int64_t nb_frames; ///< number of frames in this stream if known or 0
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291
292#define MAX_REORDER_DELAY 4
293 int64_t pts_buffer[MAX_REORDER_DELAY+1];
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294} AVStream;
295
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296#define AVFMTCTX_NOHEADER 0x0001 /* signal that no header is present
297 (streams are added dynamically) */
298
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299#define MAX_STREAMS 20
300
301/* format I/O context */
302typedef struct AVFormatContext {
7fea94ce 303 const AVClass *av_class; /* set by av_alloc_format_context */
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304 /* can only be iformat or oformat, not both at the same time */
305 struct AVInputFormat *iformat;
306 struct AVOutputFormat *oformat;
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307 void *priv_data;
308 ByteIOContext pb;
309 int nb_streams;
310 AVStream *streams[MAX_STREAMS];
311 char filename[1024]; /* input or output filename */
312 /* stream info */
4568325a 313 int64_t timestamp;
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314 char title[512];
315 char author[512];
316 char copyright[512];
317 char comment[512];
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318 char album[512];
319 int year; /* ID3 year, 0 if none */
320 int track; /* track number, 0 if none */
321 char genre[32]; /* ID3 genre */
322
da24c5e3 323 int ctx_flags; /* format specific flags, see AVFMTCTX_xx */
916c80e9 324 /* private data for pts handling (do not modify directly) */
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325 /* This buffer is only needed when packets were already buffered but
326 not decoded, for example to get the codec parameters in mpeg
327 streams */
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328 struct AVPacketList *packet_buffer;
329
330 /* decoding: position of the first frame of the component, in
331 AV_TIME_BASE fractional seconds. NEVER set this value directly:
332 it is deduced from the AVStream values. */
115329f1 333 int64_t start_time;
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334 /* decoding: duration of the stream, in AV_TIME_BASE fractional
335 seconds. NEVER set this value directly: it is deduced from the
336 AVStream values. */
337 int64_t duration;
338 /* decoding: total file size. 0 if unknown */
339 int64_t file_size;
340 /* decoding: total stream bitrate in bit/s, 0 if not
341 available. Never set it directly if the file_size and the
342 duration are known as ffmpeg can compute it automatically. */
343 int bit_rate;
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344
345 /* av_read_frame() support */
346 AVStream *cur_st;
347 const uint8_t *cur_ptr;
348 int cur_len;
349 AVPacket cur_pkt;
350
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351 /* av_seek_frame() support */
352 int64_t data_offset; /* offset of the first packet */
353 int index_built;
115329f1 354
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355 int mux_rate;
356 int packet_size;
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357 int preload;
358 int max_delay;
8108551a 359
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360#define AVFMT_NOOUTPUTLOOP -1
361#define AVFMT_INFINITEOUTPUTLOOP 0
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362 /* number of times to loop output in formats that support it */
363 int loop_output;
115329f1 364
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365 int flags;
366#define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
2c00106c 367#define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
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368
369 int loop_input;
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370 /* decoding: size of data to probe; encoding unused */
371 unsigned int probesize;
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372} AVFormatContext;
373
374typedef struct AVPacketList {
375 AVPacket pkt;
376 struct AVPacketList *next;
377} AVPacketList;
378
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379extern AVInputFormat *first_iformat;
380extern AVOutputFormat *first_oformat;
de6d9b64 381
5b6d5596 382enum CodecID av_guess_image2_codec(const char *filename);
290c5fa6 383
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384/* XXX: use automatic init with either ELF sections or C file parser */
385/* modules */
de6d9b64 386
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387#include "rtp.h"
388
389#include "rtsp.h"
390
b9a281db 391/* utils.c */
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392void av_register_input_format(AVInputFormat *format);
393void av_register_output_format(AVOutputFormat *format);
115329f1 394AVOutputFormat *guess_stream_format(const char *short_name,
36ada60c 395 const char *filename, const char *mime_type);
115329f1 396AVOutputFormat *guess_format(const char *short_name,
b9a281db 397 const char *filename, const char *mime_type);
115329f1 398enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
5b6d5596 399 const char *filename, const char *mime_type, enum CodecType type);
de6d9b64 400
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401void av_hex_dump(FILE *f, uint8_t *buf, int size);
402void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
de6d9b64 403
94988531 404void av_register_all(void);
de6d9b64 405
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406/* media file input */
407AVInputFormat *av_find_input_format(const char *short_name);
94988531 408AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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409int av_open_input_stream(AVFormatContext **ic_ptr,
410 ByteIOContext *pb, const char *filename,
da24c5e3 411 AVInputFormat *fmt, AVFormatParameters *ap);
115329f1 412int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
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413 AVInputFormat *fmt,
414 int buf_size,
415 AVFormatParameters *ap);
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416/* no av_open for output, so applications will need this: */
417AVFormatContext *av_alloc_format_context(void);
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418
419#define AVERROR_UNKNOWN (-1) /* unknown error */
420#define AVERROR_IO (-2) /* i/o error */
421#define AVERROR_NUMEXPECTED (-3) /* number syntax expected in filename */
422#define AVERROR_INVALIDDATA (-4) /* invalid data found */
423#define AVERROR_NOMEM (-5) /* not enough memory */
424#define AVERROR_NOFMT (-6) /* unknown format */
fb2758c8 425#define AVERROR_NOTSUPP (-7) /* operation not supported */
115329f1 426
b9a281db 427int av_find_stream_info(AVFormatContext *ic);
de6d9b64 428int av_read_packet(AVFormatContext *s, AVPacket *pkt);
fb2758c8 429int av_read_frame(AVFormatContext *s, AVPacket *pkt);
3ba1438d 430int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
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431int av_read_play(AVFormatContext *s);
432int av_read_pause(AVFormatContext *s);
de6d9b64 433void av_close_input_file(AVFormatContext *s);
b9a281db 434AVStream *av_new_stream(AVFormatContext *s, int id);
9ee91c2f 435void av_set_pts_info(AVStream *s, int pts_wrap_bits,
916c80e9 436 int pts_num, int pts_den);
de6d9b64 437
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438#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
439#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
27a5fe5f 440#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
3ba1438d 441
b754978a 442int av_find_default_stream_index(AVFormatContext *s);
dc56fc38 443int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
3e9245a9 444int av_add_index_entry(AVStream *st,
30a43f2d 445 int64_t pos, int64_t timestamp, int size, int distance, int flags);
3ba1438d 446int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
22ffac70 447void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
b754978a 448
b9a281db 449/* media file output */
290c5fa6 450int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
b9a281db 451int av_write_header(AVFormatContext *s);
e928649b 452int av_write_frame(AVFormatContext *s, AVPacket *pkt);
3c895fc0 453int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
f21c0b4c 454int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
e928649b 455
b9a281db 456int av_write_trailer(AVFormatContext *s);
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457
458void dump_format(AVFormatContext *ic,
115329f1 459 int index,
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460 const char *url,
461 int is_output);
462int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
445f1b83 463int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
0c1a9eda 464int64_t parse_date(const char *datestr, int duration);
de6d9b64 465
0c1a9eda 466int64_t av_gettime(void);
94988531 467
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468/* ffm specific for ffserver */
469#define FFM_PACKET_SIZE 4096
470offset_t ffm_read_write_index(int fd);
471void ffm_write_write_index(int fd, offset_t pos);
472void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
473
474int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
475
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476int av_get_frame_filename(char *buf, int buf_size,
477 const char *path, int number);
478int av_filename_number_test(const char *filename);
96baaa6a 479
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480/* grab specific */
481int video_grab_init(void);
482int audio_init(void);
96baaa6a 483
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484/* DV1394 */
485int dv1394_init(void);
f02be79d 486int dc1394_init(void);
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487
488#ifdef HAVE_AV_CONFIG_H
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489
490#include "os_support.h"
491
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492int strstart(const char *str, const char *val, const char **ptr);
493int stristart(const char *str, const char *val, const char **ptr);
494void pstrcpy(char *buf, int buf_size, const char *str);
495char *pstrcat(char *buf, int buf_size, const char *s);
fb025625 496
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497void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
498
e4e70d2e 499#ifdef __GNUC__
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500#define dynarray_add(tab, nb_ptr, elem)\
501do {\
502 typeof(tab) _tab = (tab);\
503 typeof(elem) _elem = (elem);\
504 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
505 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
506} while(0)
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507#else
508#define dynarray_add(tab, nb_ptr, elem)\
509do {\
510 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
511} while(0)
512#endif
39f472c3 513
f71869a4 514time_t mktimegm(struct tm *tm);
0c9fc6e1 515struct tm *brktimegm(time_t secs, struct tm *tm);
115329f1 516const char *small_strptime(const char *p, const char *fmt,
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517 struct tm *dt);
518
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519struct in_addr;
520int resolve_host(struct in_addr *sin_addr, const char *hostname);
521
522void url_split(char *proto, int proto_size,
6ba5cbc6 523 char *authorization, int authorization_size,
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524 char *hostname, int hostname_size,
525 int *port_ptr,
526 char *path, int path_size,
527 const char *url);
528
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529int match_ext(const char *filename, const char *extensions);
530
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531#endif /* HAVE_AV_CONFIG_H */
532
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533#ifdef __cplusplus
534}
535#endif
536
fb025625 537#endif /* AVFORMAT_H */
f3356e9c 538