libavformat/avformat.h

Go to the documentation of this file.

/*
 * copyright (c) 2001 Fabrice Bellard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVFORMAT_AVFORMAT_H
#define AVFORMAT_AVFORMAT_H


unsigned avformat_version(void);

const char *avformat_configuration(void);

const char *avformat_license(void);

#include <time.h>
#include <stdio.h>  /* FILE */
#include "libavcodec/avcodec.h"
#include "libavutil/dict.h"

#include "avio.h"
#include "libavformat/version.h"

struct AVFormatContext;


#if FF_API_OLD_METADATA2

#define AV_METADATA_MATCH_CASE      AV_DICT_MATCH_CASE
#define AV_METADATA_IGNORE_SUFFIX   AV_DICT_IGNORE_SUFFIX
#define AV_METADATA_DONT_STRDUP_KEY AV_DICT_DONT_STRDUP_KEY
#define AV_METADATA_DONT_STRDUP_VAL AV_DICT_DONT_STRDUP_VAL
#define AV_METADATA_DONT_OVERWRITE  AV_DICT_DONT_OVERWRITE

typedef attribute_deprecated AVDictionary AVMetadata;
typedef attribute_deprecated AVDictionaryEntry  AVMetadataTag;

typedef struct AVMetadataConv AVMetadataConv;

attribute_deprecated AVDictionaryEntry *
av_metadata_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags);

attribute_deprecated int av_metadata_set2(AVDictionary **pm, const char *key, const char *value, int flags);

attribute_deprecated void av_metadata_conv(struct AVFormatContext *ctx, const AVMetadataConv *d_conv,
                                                                        const AVMetadataConv *s_conv);

attribute_deprecated void av_metadata_copy(AVDictionary **dst, AVDictionary *src, int flags);

attribute_deprecated void av_metadata_free(AVDictionary **m);
#endif


/* packet functions */


int av_get_packet(AVIOContext *s, AVPacket *pkt, int size);


int av_append_packet(AVIOContext *s, AVPacket *pkt, int size);

/*************************************************/
/* fractional numbers for exact pts handling */

typedef struct AVFrac {
    int64_t val, num, den;
} AVFrac;

/*************************************************/
/* input/output formats */

struct AVCodecTag;

typedef struct AVProbeData {
    const char *filename;
    unsigned char *buf; 
    int buf_size;       
} AVProbeData;

#define AVPROBE_SCORE_MAX 100               
#define AVPROBE_PADDING_SIZE 32             

typedef struct AVFormatParameters {
#if FF_API_FORMAT_PARAMETERS
    attribute_deprecated AVRational time_base;
    attribute_deprecated int sample_rate;
    attribute_deprecated int channels;
    attribute_deprecated int width;
    attribute_deprecated int height;
    attribute_deprecated enum PixelFormat pix_fmt;
    attribute_deprecated int channel; 
    attribute_deprecated const char *standard; 
    attribute_deprecated unsigned int mpeg2ts_raw:1;  
    attribute_deprecated unsigned int mpeg2ts_compute_pcr:1;
    attribute_deprecated unsigned int initial_pause:1;       
    attribute_deprecated unsigned int prealloced_context:1;
#endif
} AVFormatParameters;

#define AVFMT_NOFILE        0x0001
#define AVFMT_NEEDNUMBER    0x0002 
#define AVFMT_SHOW_IDS      0x0008 
#define AVFMT_RAWPICTURE    0x0020 
#define AVFMT_GLOBALHEADER  0x0040 
#define AVFMT_NOTIMESTAMPS  0x0080 
#define AVFMT_GENERIC_INDEX 0x0100 
#define AVFMT_TS_DISCONT    0x0200 
#define AVFMT_VARIABLE_FPS  0x0400 
#define AVFMT_NODIMENSIONS  0x0800 
#define AVFMT_NOSTREAMS     0x1000 
#define AVFMT_NOBINSEARCH   0x2000 
#define AVFMT_NOGENSEARCH   0x4000 
#define AVFMT_TS_NONSTRICT  0x8000 
typedef struct AVOutputFormat {
    const char *name;
    const char *long_name;
    const char *mime_type;
    const char *extensions; 
    int priv_data_size;
    /* output support */
    enum CodecID audio_codec; 
    enum CodecID video_codec; 
    int (*write_header)(struct AVFormatContext *);
    int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
    int (*write_trailer)(struct AVFormatContext *);
    int flags;

    void *dummy;

    int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
                             AVPacket *in, int flush);

    const struct AVCodecTag * const *codec_tag;

    enum CodecID subtitle_codec; 
#if FF_API_OLD_METADATA2
    const AVMetadataConv *metadata_conv;
#endif

    const AVClass *priv_class; 

    /* private fields */
    struct AVOutputFormat *next;
} AVOutputFormat;

typedef struct AVInputFormat {
    const char *name;

    const char *long_name;

    int priv_data_size;

    int (*read_probe)(AVProbeData *);

    int (*read_header)(struct AVFormatContext *,
                       AVFormatParameters *ap);

    int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);

    int (*read_close)(struct AVFormatContext *);

#if FF_API_READ_SEEK

    attribute_deprecated int (*read_seek)(struct AVFormatContext *,
                                          int stream_index, int64_t timestamp, int flags);
#endif

    int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
                              int64_t *pos, int64_t pos_limit);

    int flags;

    const char *extensions;

    int value;

    int (*read_play)(struct AVFormatContext *);

    int (*read_pause)(struct AVFormatContext *);

    const struct AVCodecTag * const *codec_tag;

    int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);

#if FF_API_OLD_METADATA2
    const AVMetadataConv *metadata_conv;
#endif

    const AVClass *priv_class; 

    /* private fields */
    struct AVInputFormat *next;
} AVInputFormat;

enum AVStreamParseType {
    AVSTREAM_PARSE_NONE,
    AVSTREAM_PARSE_FULL,       
    AVSTREAM_PARSE_HEADERS,    
    AVSTREAM_PARSE_TIMESTAMPS, 
    AVSTREAM_PARSE_FULL_ONCE,  
};

typedef struct AVIndexEntry {
    int64_t pos;
    int64_t timestamp;
#define AVINDEX_KEYFRAME 0x0001
    int flags:2;
    int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs. 32 bytes due to possible 8-byte alignment).
    int min_distance;         
} AVIndexEntry;

#define AV_DISPOSITION_DEFAULT   0x0001
#define AV_DISPOSITION_DUB       0x0002
#define AV_DISPOSITION_ORIGINAL  0x0004
#define AV_DISPOSITION_COMMENT   0x0008
#define AV_DISPOSITION_LYRICS    0x0010
#define AV_DISPOSITION_KARAOKE   0x0020

#define AV_DISPOSITION_FORCED    0x0040
#define AV_DISPOSITION_HEARING_IMPAIRED  0x0080  
#define AV_DISPOSITION_VISUAL_IMPAIRED   0x0100  
#define AV_DISPOSITION_CLEAN_EFFECTS     0x0200  
typedef struct AVStream {
    int index;    
    int id;       
    AVCodecContext *codec; 
    AVRational r_frame_rate;
    void *priv_data;

    /* internal data used in av_find_stream_info() */
    int64_t first_dts;

    struct AVFrac pts;

    AVRational time_base;
    int pts_wrap_bits; 
    /* ffmpeg.c private use */
    int stream_copy; 
    enum AVDiscard discard; 

    //FIXME move stuff to a flags field?
    float quality;

    int64_t start_time;

    int64_t duration;

    /* av_read_frame() support */
    enum AVStreamParseType need_parsing;
    struct AVCodecParserContext *parser;

    int64_t cur_dts;
    int last_IP_duration;
    int64_t last_IP_pts;
    /* av_seek_frame() support */
    AVIndexEntry *index_entries; 
    int nb_index_entries;
    unsigned int index_entries_allocated_size;

    int64_t nb_frames;                 

    int disposition; 
    AVProbeData probe_data;
#define MAX_REORDER_DELAY 16
    int64_t pts_buffer[MAX_REORDER_DELAY+1];

    AVRational sample_aspect_ratio;

    AVDictionary *metadata;

    /* Intended mostly for av_read_frame() support. Not supposed to be used by */
    /* external applications; try to use something else if at all possible.    */
    const uint8_t *cur_ptr;
    int cur_len;
    AVPacket cur_pkt;

    // Timestamp generation support:
    int64_t reference_dts;

#define MAX_PROBE_PACKETS 2500
    int probe_packets;

    struct AVPacketList *last_in_packet_buffer;

    AVRational avg_frame_rate;

    int codec_info_nb_frames;

    int stream_identifier;

#define MAX_STD_TIMEBASES (60*12+5)
    struct {
        int64_t last_dts;
        int64_t duration_gcd;
        int duration_count;
        double duration_error[MAX_STD_TIMEBASES];
        int64_t codec_info_duration;
    } *info;

    int request_probe;
} AVStream;

#define AV_PROGRAM_RUNNING 1

typedef struct AVProgram {
    int            id;
    int            flags;
    enum AVDiscard discard;        
    unsigned int   *stream_index;
    unsigned int   nb_stream_indexes;
    AVDictionary *metadata;

    int program_num;
    int pmt_pid;
    int pcr_pid;
} AVProgram;

#define AVFMTCTX_NOHEADER      0x0001 
typedef struct AVChapter {
    int id;                 
    AVRational time_base;   
    int64_t start, end;     
    AVDictionary *metadata;
} AVChapter;

typedef struct AVFormatContext {
    const AVClass *av_class; 
    /* Can only be iformat or oformat, not both at the same time. */
    struct AVInputFormat *iformat;
    struct AVOutputFormat *oformat;
    void *priv_data;
    AVIOContext *pb;
    unsigned int nb_streams;
    AVStream **streams;
    char filename[1024]; 
    /* stream info */
    int64_t timestamp;

    int ctx_flags; 
    /* private data for pts handling (do not modify directly). */
    struct AVPacketList *packet_buffer;

    int64_t start_time;

    int64_t duration;

    int64_t file_size;

    int bit_rate;

    /* av_read_frame() support */
    AVStream *cur_st;

    /* av_seek_frame() support */
    int64_t data_offset; 
    int mux_rate;
    unsigned int packet_size;
    int preload;
    int max_delay;

#define AVFMT_NOOUTPUTLOOP -1
#define AVFMT_INFINITEOUTPUTLOOP 0

    int loop_output;

    int flags;
#define AVFMT_FLAG_GENPTS       0x0001 
#define AVFMT_FLAG_IGNIDX       0x0002 
#define AVFMT_FLAG_NONBLOCK     0x0004 
#define AVFMT_FLAG_IGNDTS       0x0008 
#define AVFMT_FLAG_NOFILLIN     0x0010 
#define AVFMT_FLAG_NOPARSE      0x0020 
#if FF_API_FLAG_RTP_HINT
#define AVFMT_FLAG_RTP_HINT     0x0040 
#endif
#define AVFMT_FLAG_CUSTOM_IO    0x0080 
#define AVFMT_FLAG_MP4A_LATM    0x8000 
#define AVFMT_FLAG_SORT_DTS    0x10000 
#define AVFMT_FLAG_PRIV_OPT    0x20000 
#define AVFMT_FLAG_KEEP_SIDE_DATA 0x40000 

    int loop_input;

    unsigned int probesize;

    int max_analyze_duration;

    const uint8_t *key;
    int keylen;

    unsigned int nb_programs;
    AVProgram **programs;

    enum CodecID video_codec_id;

    enum CodecID audio_codec_id;

    enum CodecID subtitle_codec_id;

    unsigned int max_index_size;

    unsigned int max_picture_buffer;

    unsigned int nb_chapters;
    AVChapter **chapters;

    int debug;
#define FF_FDEBUG_TS        0x0001

    struct AVPacketList *raw_packet_buffer;
    struct AVPacketList *raw_packet_buffer_end;

    struct AVPacketList *packet_buffer_end;

    AVDictionary *metadata;

#define RAW_PACKET_BUFFER_SIZE 2500000
    int raw_packet_buffer_remaining_size;

    int64_t start_time_realtime;

    int fps_probe_size;

    int ts_id;
} AVFormatContext;

typedef struct AVPacketList {
    AVPacket pkt;
    struct AVPacketList *next;
} AVPacketList;

AVInputFormat  *av_iformat_next(AVInputFormat  *f);

AVOutputFormat *av_oformat_next(AVOutputFormat *f);

#if FF_API_GUESS_IMG2_CODEC
attribute_deprecated enum CodecID av_guess_image2_codec(const char *filename);
#endif

/* XXX: Use automatic init with either ELF sections or C file parser */
/* modules. */

/* utils.c */
void av_register_input_format(AVInputFormat *format);
void av_register_output_format(AVOutputFormat *format);

AVOutputFormat *av_guess_format(const char *short_name,
                                const char *filename,
                                const char *mime_type);

enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
                            const char *filename, const char *mime_type,
                            enum AVMediaType type);

void av_hex_dump(FILE *f, uint8_t *buf, int size);

void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);

void av_pkt_dump2(FILE *f, AVPacket *pkt, int dump_payload, AVStream *st);


void av_pkt_dump_log2(void *avcl, int level, AVPacket *pkt, int dump_payload,
                      AVStream *st);

#if FF_API_PKT_DUMP
attribute_deprecated void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
attribute_deprecated void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt,
                                          int dump_payload);
#endif

void av_register_all(void);

enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);

unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);

/* media file input */

AVInputFormat *av_find_input_format(const char *short_name);

AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);

AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);

AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret);

int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
                          const char *filename, void *logctx,
                          unsigned int offset, unsigned int max_probe_size);

#if FF_API_FORMAT_PARAMETERS

attribute_deprecated int av_open_input_stream(AVFormatContext **ic_ptr,
                         AVIOContext *pb, const char *filename,
                         AVInputFormat *fmt, AVFormatParameters *ap);

attribute_deprecated int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
                       AVInputFormat *fmt,
                       int buf_size,
                       AVFormatParameters *ap);
#endif

int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options);

int av_demuxer_open(AVFormatContext *ic, AVFormatParameters *ap);

AVFormatContext *avformat_alloc_context(void);

#if FF_API_ALLOC_OUTPUT_CONTEXT

attribute_deprecated
AVFormatContext *avformat_alloc_output_context(const char *format,
                                               AVOutputFormat *oformat,
                                               const char *filename);
#endif

int avformat_alloc_output_context2(AVFormatContext **ctx, AVOutputFormat *oformat,
                                   const char *format_name, const char *filename);

#if FF_API_FORMAT_PARAMETERS

int av_find_stream_info(AVFormatContext *ic);
#endif

int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options);

int av_find_best_stream(AVFormatContext *ic,
                        enum AVMediaType type,
                        int wanted_stream_nb,
                        int related_stream,
                        AVCodec **decoder_ret,
                        int flags);

int av_read_packet(AVFormatContext *s, AVPacket *pkt);

int av_read_frame(AVFormatContext *s, AVPacket *pkt);

int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
                  int flags);

int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);

int av_read_play(AVFormatContext *s);

int av_read_pause(AVFormatContext *s);

void av_close_input_stream(AVFormatContext *s);

void av_close_input_file(AVFormatContext *s);

void avformat_free_context(AVFormatContext *s);

AVStream *av_new_stream(AVFormatContext *s, int id);
AVProgram *av_new_program(AVFormatContext *s, int id);

void av_set_pts_info(AVStream *s, int pts_wrap_bits,
                     unsigned int pts_num, unsigned int pts_den);

#define AVSEEK_FLAG_BACKWARD 1 
#define AVSEEK_FLAG_BYTE     2 
#define AVSEEK_FLAG_ANY      4 
#define AVSEEK_FLAG_FRAME    8 

int av_find_default_stream_index(AVFormatContext *s);

int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);

int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
                       int size, int distance, int flags);

int av_seek_frame_binary(AVFormatContext *s, int stream_index,
                         int64_t target_ts, int flags);

void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);

int64_t av_gen_search(AVFormatContext *s, int stream_index,
                      int64_t target_ts, int64_t pos_min,
                      int64_t pos_max, int64_t pos_limit,
                      int64_t ts_min, int64_t ts_max,
                      int flags, int64_t *ts_ret,
                      int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));

#if FF_API_FORMAT_PARAMETERS

attribute_deprecated int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
#endif

void av_url_split(char *proto,         int proto_size,
                  char *authorization, int authorization_size,
                  char *hostname,      int hostname_size,
                  int *port_ptr,
                  char *path,          int path_size,
                  const char *url);

int avformat_write_header(AVFormatContext *s, AVDictionary **options);

#if FF_API_FORMAT_PARAMETERS

attribute_deprecated int av_write_header(AVFormatContext *s);
#endif

int av_write_frame(AVFormatContext *s, AVPacket *pkt);

int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);

int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
                                 AVPacket *pkt, int flush);

int av_write_trailer(AVFormatContext *s);

#if FF_API_DUMP_FORMAT

attribute_deprecated void dump_format(AVFormatContext *ic,
                                      int index,
                                      const char *url,
                                      int is_output);
#endif

void av_dump_format(AVFormatContext *ic,
                    int index,
                    const char *url,
                    int is_output);

#if FF_API_PARSE_DATE

attribute_deprecated
int64_t parse_date(const char *datestr, int duration);
#endif

int64_t av_gettime(void);

#if FF_API_FIND_INFO_TAG

attribute_deprecated int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
#endif

int av_get_frame_filename(char *buf, int buf_size,
                          const char *path, int number);

int av_filename_number_test(const char *filename);

int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);

#if FF_API_SDP_CREATE
attribute_deprecated int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
#endif

int av_match_ext(const char *filename, const char *extensions);

#endif /* AVFORMAT_AVFORMAT_H */

---