FFmpeg/libavformat/isom.h

/*
 * ISO Media common code
 * copyright (c) 2001 Fabrice Bellard
 * copyright (c) 2002 Francois Revol <revol@free.fr>
 * copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
 *
 * 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_ISOM_H
#define AVFORMAT_ISOM_H

#include "avio.h"
#include "riff.h"
#include "dv.h"

/* isom.c */
extern const AVCodecTag ff_mp4_obj_type[];
extern const AVCodecTag codec_movvideo_tags[];
extern const AVCodecTag codec_movaudio_tags[];
extern const AVCodecTag ff_codec_movsubtitle_tags[];

int ff_mov_iso639_to_lang(const char *lang, int mp4);
int ff_mov_lang_to_iso639(unsigned code, char *to);

/* the QuickTime file format is quite convoluted...
 * it has lots of index tables, each indexing something in another one...
 * Here we just use what is needed to read the chunks
 */

typedef struct {
    int count;
    int duration;
} MOVStts;

typedef struct {
    int first;
    int count;
    int id;
} MOVStsc;

typedef struct {
    uint32_t type;
    char *path;
} MOVDref;

typedef struct {
    uint32_t type;
    int64_t offset;
    int64_t size; /* total size (excluding the size and type fields) */
} MOVAtom;

struct MOVParseTableEntry;

typedef struct {
    unsigned track_id;
    uint64_t base_data_offset;
    uint64_t moof_offset;
    unsigned stsd_id;
    unsigned duration;
    unsigned size;
    unsigned flags;
} MOVFragment;

typedef struct {
    unsigned track_id;
    unsigned stsd_id;
    unsigned duration;
    unsigned size;
    unsigned flags;
} MOVTrackExt;

typedef struct MOVStreamContext {
    ByteIOContext *pb;
    int ffindex; /* the ffmpeg stream id */
    int next_chunk;
    unsigned int chunk_count;
    int64_t *chunk_offsets;
    unsigned int stts_count;
    MOVStts *stts_data;
    unsigned int ctts_count;
    MOVStts *ctts_data;
    unsigned int stsc_count;
    MOVStsc *stsc_data;
    int ctts_index;
    int ctts_sample;
    unsigned int sample_size;
    unsigned int sample_count;
    int *sample_sizes;
    unsigned int keyframe_count;
    int *keyframes;
    int time_scale;
    int time_rate;
    int time_offset; ///< time offset of the first edit list entry
    int current_sample;
    unsigned int bytes_per_frame;
    unsigned int samples_per_frame;
    int dv_audio_container;
    int pseudo_stream_id; ///< -1 means demux all ids
    int16_t audio_cid; ///< stsd audio compression id
    unsigned drefs_count;
    MOVDref *drefs;
    int dref_id;
    int wrong_dts; ///< dts are wrong due to negative ctts
    int width;  ///< tkhd width
    int height; ///< tkhd height
} MOVStreamContext;

typedef struct MOVContext {
    AVFormatContext *fc;
    int time_scale;
    int64_t duration; /* duration of the longest track */
    int found_moov; /* when both 'moov' and 'mdat' sections has been found */
    int found_mdat; /* we suppose we have enough data to read the file */
    DVDemuxContext *dv_demux;
    AVFormatContext *dv_fctx;
    int isom; /* 1 if file is ISO Media (mp4/3gp) */
    MOVFragment fragment; ///< current fragment in moof atom
    MOVTrackExt *trex_data;
    unsigned trex_count;
    int itunes_metadata; ///< metadata are itunes style
} MOVContext;

#endif /* AVFORMAT_ISOM_H */