FFmpeg: libavformat/isom.h Source File

00001 /*
00002  * ISO Media common code
00003  * copyright (c) 2001 Fabrice Bellard
00004  * copyright (c) 2002 Francois Revol <revol@free.fr>
00005  * copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
00006  *
00007  * This file is part of FFmpeg.
00008  *
00009  * FFmpeg is free software; you can redistribute it and/or
00010  * modify it under the terms of the GNU Lesser General Public
00011  * License as published by the Free Software Foundation; either
00012  * version 2.1 of the License, or (at your option) any later version.
00013  *
00014  * FFmpeg is distributed in the hope that it will be useful,
00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017  * Lesser General Public License for more details.
00018  *
00019  * You should have received a copy of the GNU Lesser General Public
00020  * License along with FFmpeg; if not, write to the Free Software
00021  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00022  */
00023 
00024 #ifndef AVFORMAT_ISOM_H
00025 #define AVFORMAT_ISOM_H
00026 
00027 #include "avio.h"
00028 #include "riff.h"
00029 #include "dv.h"
00030 
00031 /* isom.c */
00032 extern const AVCodecTag ff_mp4_obj_type[];
00033 extern const AVCodecTag codec_movvideo_tags[];
00034 extern const AVCodecTag codec_movaudio_tags[];
00035 extern const AVCodecTag ff_codec_movsubtitle_tags[];
00036 
00037 int ff_mov_iso639_to_lang(const char lang[4], int mp4);
00038 int ff_mov_lang_to_iso639(unsigned code, char to[4]);
00039 
00040 /* the QuickTime file format is quite convoluted...
00041  * it has lots of index tables, each indexing something in another one...
00042  * Here we just use what is needed to read the chunks
00043  */
00044 
00045 typedef struct {
00046     int count;
00047     int duration;
00048 } MOVStts;
00049 
00050 typedef struct {
00051     int first;
00052     int count;
00053     int id;
00054 } MOVStsc;
00055 
00056 typedef struct {
00057     uint32_t type;
00058     char *path;
00059     char *dir;
00060     char volume[28];
00061     char filename[64];
00062     int16_t nlvl_to, nlvl_from;
00063 } MOVDref;
00064 
00065 typedef struct {
00066     uint32_t type;
00067     int64_t size; /* total size (excluding the size and type fields) */
00068 } MOVAtom;
00069 
00070 struct MOVParseTableEntry;
00071 
00072 typedef struct {
00073     unsigned track_id;
00074     uint64_t base_data_offset;
00075     uint64_t moof_offset;
00076     unsigned stsd_id;
00077     unsigned duration;
00078     unsigned size;
00079     unsigned flags;
00080 } MOVFragment;
00081 
00082 typedef struct {
00083     unsigned track_id;
00084     unsigned stsd_id;
00085     unsigned duration;
00086     unsigned size;
00087     unsigned flags;
00088 } MOVTrackExt;
00089 
00090 typedef struct MOVStreamContext {
00091     ByteIOContext *pb;
00092     int ffindex;          
00093     int next_chunk;
00094     unsigned int chunk_count;
00095     int64_t *chunk_offsets;
00096     unsigned int stts_count;
00097     MOVStts *stts_data;
00098     unsigned int ctts_count;
00099     MOVStts *ctts_data;
00100     unsigned int stsc_count;
00101     MOVStsc *stsc_data;
00102     unsigned int stps_count;
00103     unsigned *stps_data;  
00104     int ctts_index;
00105     int ctts_sample;
00106     unsigned int sample_size;
00107     unsigned int sample_count;
00108     int *sample_sizes;
00109     unsigned int keyframe_count;
00110     int *keyframes;
00111     int time_scale;
00112     int time_offset;      
00113     int current_sample;
00114     unsigned int bytes_per_frame;
00115     unsigned int samples_per_frame;
00116     int dv_audio_container;
00117     int pseudo_stream_id; 
00118     int16_t audio_cid;    
00119     unsigned drefs_count;
00120     MOVDref *drefs;
00121     int dref_id;
00122     int wrong_dts;        
00123     int width;            
00124     int height;           
00125     int dts_shift;        
00126 } MOVStreamContext;
00127 
00128 typedef struct MOVContext {
00129     AVFormatContext *fc;
00130     int time_scale;
00131     int64_t duration;     
00132     int found_moov;       
00133     int found_mdat;       
00134     DVDemuxContext *dv_demux;
00135     AVFormatContext *dv_fctx;
00136     int isom;             
00137     MOVFragment fragment; 
00138     MOVTrackExt *trex_data;
00139     unsigned trex_count;
00140     int itunes_metadata;  
00141     int chapter_track;
00142 } MOVContext;
00143 
00144 int ff_mp4_read_descr_len(ByteIOContext *pb);
00145 int ff_mov_read_esds(AVFormatContext *fc, ByteIOContext *pb, MOVAtom atom);
00146 enum CodecID ff_mov_get_lpcm_codec_id(int bps, int flags);
00147 
00148 #endif /* AVFORMAT_ISOM_H */