libavformat/isom.h

   1 /*
   2  * ISO Media common code
   3  * copyright (c) 2001 Fabrice Bellard
   4  * copyright (c) 2002 Francois Revol <revol@free.fr>
   5  * copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
   6  *
   7  * This file is part of FFmpeg.
   8  *
   9  * FFmpeg is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * FFmpeg is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with FFmpeg; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #ifndef AVFORMAT_ISOM_H
  25 #define AVFORMAT_ISOM_H
  26
  27 #include "avio.h"
  28 #include "riff.h"
  29 #include "dv.h"
  30
  31 /* isom.c */
  32 extern const AVCodecTag ff_mp4_obj_type[];
  33 extern const AVCodecTag codec_movvideo_tags[];
  34 extern const AVCodecTag codec_movaudio_tags[];
  35 extern const AVCodecTag ff_codec_movsubtitle_tags[];
  36
  37 int ff_mov_iso639_to_lang(const char *lang, int mp4);
  38 int ff_mov_lang_to_iso639(unsigned code, char *to);
  39
  40 /* the QuickTime file format is quite convoluted...
  41  * it has lots of index tables, each indexing something in another one...
  42  * Here we just use what is needed to read the chunks
  43  */
  44
  45 typedef struct {
  46     int count;
  47     int duration;
  48 } MOVStts;
  49
  50 typedef struct {
  51     int first;
  52     int count;
  53     int id;
  54 } MOVStsc;
  55
  56 typedef struct {
  57     uint32_t type;
  58     char *path;
  59     char *dir;
  60     char volume[28];
  61     char filename[64];
  62     int16_t nlvl_to, nlvl_from;
  63 } MOVDref;
  64
  65 typedef struct {
  66     uint32_t type;
  67     int64_t offset;
  68     int64_t size; /* total size (excluding the size and type fields) */
  69 } MOVAtom;
  70
  71 struct MOVParseTableEntry;
  72
  73 typedef struct {
  74     unsigned track_id;
  75     uint64_t base_data_offset;
  76     uint64_t moof_offset;
  77     unsigned stsd_id;
  78     unsigned duration;
  79     unsigned size;
  80     unsigned flags;
  81 } MOVFragment;
  82
  83 typedef struct {
  84     unsigned track_id;
  85     unsigned stsd_id;
  86     unsigned duration;
  87     unsigned size;
  88     unsigned flags;
  89 } MOVTrackExt;
  90
  91 typedef struct MOVStreamContext {
  92     ByteIOContext *pb;
  93     int ffindex;          ///< AVStream index
  94     int next_chunk;
  95     unsigned int chunk_count;
  96     int64_t *chunk_offsets;
  97     unsigned int stts_count;
  98     MOVStts *stts_data;
  99     unsigned int ctts_count;
 100     MOVStts *ctts_data;
 101     unsigned int stsc_count;
 102     MOVStsc *stsc_data;
 103     unsigned int stps_count;
 104     unsigned *stps_data;  ///< partial sync sample for mpeg-2 open gop
 105     int ctts_index;
 106     int ctts_sample;
 107     unsigned int sample_size;
 108     unsigned int sample_count;
 109     int *sample_sizes;
 110     unsigned int keyframe_count;
 111     int *keyframes;
 112     int time_scale;
 113     int time_offset;      ///< time offset of the first edit list entry
 114     int current_sample;
 115     unsigned int bytes_per_frame;
 116     unsigned int samples_per_frame;
 117     int dv_audio_container;
 118     int pseudo_stream_id; ///< -1 means demux all ids
 119     int16_t audio_cid;    ///< stsd audio compression id
 120     unsigned drefs_count;
 121     MOVDref *drefs;
 122     int dref_id;
 123     int wrong_dts;        ///< dts are wrong due to huge ctts offset (iMovie files)
 124     int width;            ///< tkhd width
 125     int height;           ///< tkhd height
 126     int dts_shift;        ///< dts shift when ctts is negative
 127 } MOVStreamContext;
 128
 129 typedef struct MOVContext {
 130     AVFormatContext *fc;
 131     int time_scale;
 132     int64_t duration;     ///< duration of the longest track
 133     int found_moov;       ///< 'moov' atom has been found
 134     int found_mdat;       ///< 'mdat' atom has been found
 135     DVDemuxContext *dv_demux;
 136     AVFormatContext *dv_fctx;
 137     int isom;             ///< 1 if file is ISO Media (mp4/3gp)
 138     MOVFragment fragment; ///< current fragment in moof atom
 139     MOVTrackExt *trex_data;
 140     unsigned trex_count;
 141     int itunes_metadata;  ///< metadata are itunes style
 142 } MOVContext;
 143
 144 int ff_mp4_read_descr_len(ByteIOContext *pb);
 145 int ff_mov_read_esds(AVFormatContext *fc, ByteIOContext *pb, MOVAtom atom);
 146 enum CodecID ff_mov_get_lpcm_codec_id(int bps, int flags);
 147
 148 #endif /* AVFORMAT_ISOM_H */