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ffmpeg / libavformat / avformat.h @ 4647c0ec

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1 04d7f601 Diego Biurrun
/*
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 * copyright (c) 2001 Fabrice Bellard
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef AVFORMAT_H
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#define AVFORMAT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define LIBAVFORMAT_VERSION_INT ((51<<16)+(6<<8)+0)
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#define LIBAVFORMAT_VERSION     51.6.0
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#define LIBAVFORMAT_BUILD       LIBAVFORMAT_VERSION_INT
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#define LIBAVFORMAT_IDENT       "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
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#include <time.h>
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#include <stdio.h>  /* FILE */
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#include "avcodec.h"
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#include "avio.h"
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/* packet functions */
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#ifndef MAXINT64
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#define MAXINT64 int64_t_C(0x7fffffffffffffff)
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#endif
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#ifndef MININT64
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#define MININT64 int64_t_C(0x8000000000000000)
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#endif
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typedef struct AVPacket {
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    int64_t pts;                            ///< presentation time stamp in time_base units
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    int64_t dts;                            ///< decompression time stamp in time_base units
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    uint8_t *data;
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    int   size;
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    int   stream_index;
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    int   flags;
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    int   duration;                         ///< presentation duration in time_base units (0 if not available)
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    void  (*destruct)(struct AVPacket *);
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    void  *priv;
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    int64_t pos;                            ///< byte position in stream, -1 if unknown
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} AVPacket;
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#define PKT_FLAG_KEY   0x0001
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void av_destruct_packet_nofree(AVPacket *pkt);
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void av_destruct_packet(AVPacket *pkt);
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/* initialize optional fields of a packet */
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static inline void av_init_packet(AVPacket *pkt)
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{
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    pkt->pts   = AV_NOPTS_VALUE;
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    pkt->dts   = AV_NOPTS_VALUE;
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    pkt->pos   = -1;
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    pkt->duration = 0;
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    pkt->flags = 0;
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    pkt->stream_index = 0;
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    pkt->destruct= av_destruct_packet_nofree;
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}
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int av_new_packet(AVPacket *pkt, int size);
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int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
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int av_dup_packet(AVPacket *pkt);
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/**
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 * Free a packet
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 *
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 * @param pkt packet to free
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 */
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static inline void av_free_packet(AVPacket *pkt)
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{
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    if (pkt && pkt->destruct) {
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        pkt->destruct(pkt);
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    }
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}
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/*************************************************/
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/* fractional numbers for exact pts handling */
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/* the exact value of the fractional number is: 'val + num / den'. num
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   is assumed to be such as 0 <= num < den */
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typedef struct AVFrac {
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    int64_t val, num, den;
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} AVFrac attribute_deprecated;
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/*************************************************/
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/* input/output formats */
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struct AVFormatContext;
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/* this structure contains the data a format has to probe a file */
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typedef struct AVProbeData {
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    const char *filename;
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    unsigned char *buf;
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    int buf_size;
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} AVProbeData;
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#define AVPROBE_SCORE_MAX 100               ///< max score, half of that is used for file extension based detection
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typedef struct AVFormatParameters {
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    AVRational time_base;
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    int sample_rate;
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    int channels;
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    int width;
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    int height;
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    enum PixelFormat pix_fmt;
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    int channel; /* used to select dv channel */
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    const char *device; /* video, audio or DV device */
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    const char *standard; /* tv standard, NTSC, PAL, SECAM */
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    int mpeg2ts_raw:1;  /* force raw MPEG2 transport stream output, if possible */
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    int mpeg2ts_compute_pcr:1; /* compute exact PCR for each transport
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                                  stream packet (only meaningful if
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                                  mpeg2ts_raw is TRUE */
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    int initial_pause:1;       /* do not begin to play the stream
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                                  immediately (RTSP only) */
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    int prealloced_context:1;
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    enum CodecID video_codec_id;
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    enum CodecID audio_codec_id;
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} AVFormatParameters;
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#define AVFMT_NOFILE        0x0001 /* no file should be opened */
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#define AVFMT_NEEDNUMBER    0x0002 /* needs '%d' in filename */
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#define AVFMT_SHOW_IDS      0x0008 /* show format stream IDs numbers */
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#define AVFMT_RAWPICTURE    0x0020 /* format wants AVPicture structure for
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                                      raw picture data */
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#define AVFMT_GLOBALHEADER  0x0040 /* format wants global header */
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#define AVFMT_NOTIMESTAMPS  0x0080 /* format doesnt need / has any timestamps */
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typedef struct AVOutputFormat {
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    const char *name;
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    const char *long_name;
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    const char *mime_type;
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    const char *extensions; /* comma separated extensions */
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    /* size of private data so that it can be allocated in the wrapper */
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    int priv_data_size;
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    /* output support */
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    enum CodecID audio_codec; /* default audio codec */
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    enum CodecID video_codec; /* default video codec */
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    int (*write_header)(struct AVFormatContext *);
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    int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
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    int (*write_trailer)(struct AVFormatContext *);
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    /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
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    int flags;
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    /* currently only used to set pixel format if not YUV420P */
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    int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
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    int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
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    /* private fields */
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    struct AVOutputFormat *next;
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} AVOutputFormat;
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typedef struct AVInputFormat {
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    const char *name;
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    const char *long_name;
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    /* size of private data so that it can be allocated in the wrapper */
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    int priv_data_size;
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    /* tell if a given file has a chance of being parsing by this format */
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    int (*read_probe)(AVProbeData *);
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    /* read the format header and initialize the AVFormatContext
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       structure. Return 0 if OK. 'ap' if non NULL contains
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       additionnal paramters. Only used in raw format right
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       now. 'av_new_stream' should be called to create new streams.  */
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    int (*read_header)(struct AVFormatContext *,
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                       AVFormatParameters *ap);
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    /* read one packet and put it in 'pkt'. pts and flags are also
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       set. 'av_new_stream' can be called only if the flag
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       AVFMTCTX_NOHEADER is used. */
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    int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
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    /* close the stream. The AVFormatContext and AVStreams are not
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       freed by this function */
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    int (*read_close)(struct AVFormatContext *);
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    /**
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     * seek to a given timestamp relative to the frames in
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     * stream component stream_index
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     * @param stream_index must not be -1
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     * @param flags selects which direction should be preferred if no exact
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     *              match is available
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     */
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    int (*read_seek)(struct AVFormatContext *,
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                     int stream_index, int64_t timestamp, int flags);
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    /**
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     * gets the next timestamp in AV_TIME_BASE units.
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     */
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    int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
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                              int64_t *pos, int64_t pos_limit);
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    /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
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    int flags;
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    /* if extensions are defined, then no probe is done. You should
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       usually not use extension format guessing because it is not
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       reliable enough */
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    const char *extensions;
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    /* general purpose read only value that the format can use */
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    int value;
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    /* start/resume playing - only meaningful if using a network based format
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       (RTSP) */
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    int (*read_play)(struct AVFormatContext *);
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    /* pause playing - only meaningful if using a network based format
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       (RTSP) */
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    int (*read_pause)(struct AVFormatContext *);
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    /* private fields */
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    struct AVInputFormat *next;
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} AVInputFormat;
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typedef struct AVIndexEntry {
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    int64_t pos;
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    int64_t timestamp;
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#define AVINDEX_KEYFRAME 0x0001
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    int flags:2;
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    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)
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    int min_distance;         /* min distance between this and the previous keyframe, used to avoid unneeded searching */
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} AVIndexEntry;
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typedef struct AVStream {
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    int index;    /* stream index in AVFormatContext */
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    int id;       /* format specific stream id */
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    AVCodecContext *codec; /* codec context */
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    /**
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     * real base frame rate of the stream.
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     * for example if the timebase is 1/90000 and all frames have either
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     * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
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     */
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    AVRational r_frame_rate;
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    void *priv_data;
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    /* internal data used in av_find_stream_info() */
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    int64_t codec_info_duration;
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    int codec_info_nb_frames;
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    /* encoding: PTS generation when outputing stream */
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    AVFrac pts;
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    /**
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     * this is the fundamental unit of time (in seconds) in terms
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     * of which frame timestamps are represented. for fixed-fps content,
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     * timebase should be 1/framerate and timestamp increments should be
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     * identically 1.
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     */
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    AVRational time_base;
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    int pts_wrap_bits; /* number of bits in pts (used for wrapping control) */
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    /* ffmpeg.c private use */
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    int stream_copy; /* if TRUE, just copy stream */
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    enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
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    //FIXME move stuff to a flags field?
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    /* quality, as it has been removed from AVCodecContext and put in AVVideoFrame
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     * MN:dunno if thats the right place, for it */
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    float quality;
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    /* decoding: position of the first frame of the component, in
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       AV_TIME_BASE fractional seconds. */
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    int64_t start_time;
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    /* decoding: duration of the stream, in AV_TIME_BASE fractional
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       seconds. */
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    int64_t duration;
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    char language[4]; /* ISO 639 3-letter language code (empty string if undefined) */
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    /* av_read_frame() support */
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    int need_parsing;                  ///< 1->full parsing needed, 2->only parse headers dont repack
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    struct AVCodecParserContext *parser;
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    int64_t cur_dts;
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    int last_IP_duration;
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    int64_t last_IP_pts;
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    /* av_seek_frame() support */
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    AVIndexEntry *index_entries; /* only used if the format does not
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                                    support seeking natively */
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    int nb_index_entries;
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    unsigned int index_entries_allocated_size;
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    int64_t nb_frames;                 ///< number of frames in this stream if known or 0
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#define MAX_REORDER_DELAY 4
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    int64_t pts_buffer[MAX_REORDER_DELAY+1];
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} AVStream;
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#define AVFMTCTX_NOHEADER      0x0001 /* signal that no header is present
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                                         (streams are added dynamically) */
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#define MAX_STREAMS 20
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/* format I/O context */
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typedef struct AVFormatContext {
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    const AVClass *av_class; /* set by av_alloc_format_context */
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    /* can only be iformat or oformat, not both at the same time */
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    struct AVInputFormat *iformat;
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    struct AVOutputFormat *oformat;
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    void *priv_data;
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    ByteIOContext pb;
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    int nb_streams;
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    AVStream *streams[MAX_STREAMS];
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    char filename[1024]; /* input or output filename */
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    /* stream info */
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    int64_t timestamp;
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    char title[512];
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    char author[512];
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    char copyright[512];
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    char comment[512];
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    char album[512];
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    int year;  /* ID3 year, 0 if none */
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    int track; /* track number, 0 if none */
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    char genre[32]; /* ID3 genre */
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    int ctx_flags; /* format specific flags, see AVFMTCTX_xx */
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    /* private data for pts handling (do not modify directly) */
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    /* This buffer is only needed when packets were already buffered but
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       not decoded, for example to get the codec parameters in mpeg
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       streams */
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    struct AVPacketList *packet_buffer;
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    /* decoding: position of the first frame of the component, in
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       AV_TIME_BASE fractional seconds. NEVER set this value directly:
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       it is deduced from the AVStream values.  */
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    int64_t start_time;
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    /* decoding: duration of the stream, in AV_TIME_BASE fractional
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       seconds. NEVER set this value directly: it is deduced from the
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       AVStream values.  */
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    int64_t duration;
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    /* decoding: total file size. 0 if unknown */
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    int64_t file_size;
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    /* decoding: total stream bitrate in bit/s, 0 if not
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       available. Never set it directly if the file_size and the
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       duration are known as ffmpeg can compute it automatically. */
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    int bit_rate;
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    /* av_read_frame() support */
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    AVStream *cur_st;
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    const uint8_t *cur_ptr;
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    int cur_len;
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    AVPacket cur_pkt;
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    /* av_seek_frame() support */
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    int64_t data_offset; /* offset of the first packet */
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    int index_built;
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    int mux_rate;
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    int packet_size;
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    int preload;
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    int max_delay;
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#define AVFMT_NOOUTPUTLOOP -1
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#define AVFMT_INFINITEOUTPUTLOOP 0
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    /* number of times to loop output in formats that support it */
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    int loop_output;
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    int flags;
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#define AVFMT_FLAG_GENPTS       0x0001 ///< generate pts if missing even if it requires parsing future frames
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#define AVFMT_FLAG_IGNIDX       0x0002 ///< ignore index
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    int loop_input;
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    /* decoding: size of data to probe; encoding unused */
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    unsigned int probesize;
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} AVFormatContext;
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typedef struct AVPacketList {
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    AVPacket pkt;
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    struct AVPacketList *next;
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} AVPacketList;
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extern AVInputFormat *first_iformat;
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extern AVOutputFormat *first_oformat;
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enum CodecID av_guess_image2_codec(const char *filename);
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/* XXX: use automatic init with either ELF sections or C file parser */
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/* modules */
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#include "rtp.h"
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#include "rtsp.h"
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/* utils.c */
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void av_register_input_format(AVInputFormat *format);
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void av_register_output_format(AVOutputFormat *format);
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AVOutputFormat *guess_stream_format(const char *short_name,
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                                    const char *filename, const char *mime_type);
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AVOutputFormat *guess_format(const char *short_name,
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                             const char *filename, const char *mime_type);
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enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
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                            const char *filename, const char *mime_type, enum CodecType type);
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void av_hex_dump(FILE *f, uint8_t *buf, int size);
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void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
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void av_register_all(void);
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/* media file input */
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AVInputFormat *av_find_input_format(const char *short_name);
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AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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int av_open_input_stream(AVFormatContext **ic_ptr,
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                         ByteIOContext *pb, const char *filename,
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                         AVInputFormat *fmt, AVFormatParameters *ap);
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int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
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                       AVInputFormat *fmt,
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                       int buf_size,
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                       AVFormatParameters *ap);
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/* no av_open for output, so applications will need this: */
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AVFormatContext *av_alloc_format_context(void);
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#define AVERROR_UNKNOWN     (-1)  /* unknown error */
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#define AVERROR_IO          (-2)  /* i/o error */
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#define AVERROR_NUMEXPECTED (-3)  /* number syntax expected in filename */
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#define AVERROR_INVALIDDATA (-4)  /* invalid data found */
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#define AVERROR_NOMEM       (-5)  /* not enough memory */
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#define AVERROR_NOFMT       (-6)  /* unknown format */
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#define AVERROR_NOTSUPP     (-7)  /* operation not supported */
423 115329f1 Diego Biurrun
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int av_find_stream_info(AVFormatContext *ic);
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int av_read_packet(AVFormatContext *s, AVPacket *pkt);
426 fb2758c8 Fabrice Bellard
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
427 3ba1438d Michael Niedermayer
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
428 fb2758c8 Fabrice Bellard
int av_read_play(AVFormatContext *s);
429
int av_read_pause(AVFormatContext *s);
430 de6d9b64 Fabrice Bellard
void av_close_input_file(AVFormatContext *s);
431 b9a281db Fabrice Bellard
AVStream *av_new_stream(AVFormatContext *s, int id);
432 9ee91c2f Michael Niedermayer
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
433 916c80e9 Fabrice Bellard
                     int pts_num, int pts_den);
434 de6d9b64 Fabrice Bellard
435 3ba1438d Michael Niedermayer
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
436
#define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
437 27a5fe5f Michael Niedermayer
#define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non keyframes
438 3ba1438d Michael Niedermayer
439 b754978a Michael Niedermayer
int av_find_default_stream_index(AVFormatContext *s);
440 dc56fc38 Michael Niedermayer
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
441 3e9245a9 Michael Niedermayer
int av_add_index_entry(AVStream *st,
442 30a43f2d Michael Niedermayer
                       int64_t pos, int64_t timestamp, int size, int distance, int flags);
443 3ba1438d Michael Niedermayer
int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
444 22ffac70 Reimar Döffinger
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
445 b754978a Michael Niedermayer
446 b9a281db Fabrice Bellard
/* media file output */
447 290c5fa6 Fabrice Bellard
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
448 b9a281db Fabrice Bellard
int av_write_header(AVFormatContext *s);
449 e928649b Michael Niedermayer
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
450 3c895fc0 Michael Niedermayer
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
451 f21c0b4c Baptiste Coudurier
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
452 e928649b Michael Niedermayer
453 b9a281db Fabrice Bellard
int av_write_trailer(AVFormatContext *s);
454 de6d9b64 Fabrice Bellard
455
void dump_format(AVFormatContext *ic,
456 115329f1 Diego Biurrun
                 int index,
457 de6d9b64 Fabrice Bellard
                 const char *url,
458
                 int is_output);
459
int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
460 445f1b83 Roman Shaposhnik
int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
461 0c1a9eda Zdenek Kabelac
int64_t parse_date(const char *datestr, int duration);
462 de6d9b64 Fabrice Bellard
463 0c1a9eda Zdenek Kabelac
int64_t av_gettime(void);
464 94988531 Fabrice Bellard
465 de6d9b64 Fabrice Bellard
/* ffm specific for ffserver */
466
#define FFM_PACKET_SIZE 4096
467
offset_t ffm_read_write_index(int fd);
468
void ffm_write_write_index(int fd, offset_t pos);
469
void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
470
471
int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
472
473 5c07cf53 Michel Bardiaux
int av_get_frame_filename(char *buf, int buf_size,
474
                          const char *path, int number);
475
int av_filename_number_test(const char *filename);
476 96baaa6a Fabrice Bellard
477 b9a281db Fabrice Bellard
/* grab specific */
478
int video_grab_init(void);
479
int audio_init(void);
480 96baaa6a Fabrice Bellard
481 86fd51fb Fabrice Bellard
/* DV1394 */
482
int dv1394_init(void);
483 f02be79d Roman Shaposhnik
int dc1394_init(void);
484 fb025625 Fabrice Bellard
485
#ifdef HAVE_AV_CONFIG_H
486 f71869a4 Fabrice Bellard
487
#include "os_support.h"
488
489 fb025625 Fabrice Bellard
int strstart(const char *str, const char *val, const char **ptr);
490
int stristart(const char *str, const char *val, const char **ptr);
491
void pstrcpy(char *buf, int buf_size, const char *str);
492
char *pstrcat(char *buf, int buf_size, const char *s);
493
494 39f472c3 Fabrice Bellard
void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
495
496 e4e70d2e Falk Hüffner
#ifdef __GNUC__
497 39f472c3 Fabrice Bellard
#define dynarray_add(tab, nb_ptr, elem)\
498
do {\
499
    typeof(tab) _tab = (tab);\
500
    typeof(elem) _elem = (elem);\
501
    (void)sizeof(**_tab == _elem); /* check that types are compatible */\
502
    __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
503
} while(0)
504 e4e70d2e Falk Hüffner
#else
505
#define dynarray_add(tab, nb_ptr, elem)\
506
do {\
507
    __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
508
} while(0)
509
#endif
510 39f472c3 Fabrice Bellard
511 f71869a4 Fabrice Bellard
time_t mktimegm(struct tm *tm);
512 0c9fc6e1 Roman Shaposhnik
struct tm *brktimegm(time_t secs, struct tm *tm);
513 115329f1 Diego Biurrun
const char *small_strptime(const char *p, const char *fmt,
514 f71869a4 Fabrice Bellard
                           struct tm *dt);
515
516 fb025625 Fabrice Bellard
struct in_addr;
517
int resolve_host(struct in_addr *sin_addr, const char *hostname);
518
519
void url_split(char *proto, int proto_size,
520 6ba5cbc6 Petr Doubek
               char *authorization, int authorization_size,
521 fb025625 Fabrice Bellard
               char *hostname, int hostname_size,
522
               int *port_ptr,
523
               char *path, int path_size,
524
               const char *url);
525
526 a941f391 Fabrice Bellard
int match_ext(const char *filename, const char *extensions);
527
528 fb025625 Fabrice Bellard
#endif /* HAVE_AV_CONFIG_H */
529
530 02d697aa Zdenek Kabelac
#ifdef __cplusplus
531
}
532
#endif
533
534 fb025625 Fabrice Bellard
#endif /* AVFORMAT_H */