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isom.h
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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 "internal.h"
29 #include "dv.h"
30 
31 /* isom.c */
32 extern const AVCodecTag ff_mp4_obj_type[];
33 extern const AVCodecTag ff_codec_movvideo_tags[];
34 extern const AVCodecTag ff_codec_movaudio_tags[];
36 
37 int ff_mov_iso639_to_lang(const char lang[4], int mp4);
38 int ff_mov_lang_to_iso639(unsigned code, char to[4]);
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 MOVStts {
46  int count;
47  int duration;
48 } MOVStts;
49 
50 typedef struct MOVStsc {
51  int first;
52  int count;
53  int id;
54 } MOVStsc;
55 
56 typedef struct MOVDref {
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 MOVAtom {
66  uint32_t type;
67  int64_t size; /* total size (excluding the size and type fields) */
68 } MOVAtom;
69 
70 struct MOVParseTableEntry;
71 
72 typedef struct MOVFragment {
73  unsigned track_id;
74  uint64_t base_data_offset;
75  uint64_t moof_offset;
76  unsigned stsd_id;
77  unsigned duration;
78  unsigned size;
79  unsigned flags;
80 } MOVFragment;
81 
82 typedef struct MOVTrackExt {
83  unsigned track_id;
84  unsigned stsd_id;
85  unsigned duration;
86  unsigned size;
87  unsigned flags;
88 } MOVTrackExt;
89 
90 typedef struct MOVSbgp {
91  unsigned int count;
92  unsigned int index;
93 } MOVSbgp;
94 
95 typedef struct MOVStreamContext {
97  int ffindex; ///< AVStream index
99  unsigned int chunk_count;
100  int64_t *chunk_offsets;
101  unsigned int stts_count;
103  unsigned int ctts_count;
105  unsigned int stsc_count;
107  unsigned int stps_count;
108  unsigned *stps_data; ///< partial sync sample for mpeg-2 open gop
111  unsigned int sample_size; ///< may contain value calculated from stsd or value from stsz atom
112  unsigned int alt_sample_size; ///< always contains sample size from stsz atom
113  unsigned int sample_count;
116  unsigned int keyframe_count;
117  int *keyframes;
119  int64_t empty_duration; ///< empty duration of the first edit list entry
120  int64_t start_time; ///< start time of the media
121  int64_t time_offset; ///< time offset of the edit list entries
123  unsigned int bytes_per_frame;
124  unsigned int samples_per_frame;
126  int pseudo_stream_id; ///< -1 means demux all ids
127  int16_t audio_cid; ///< stsd audio compression id
128  unsigned drefs_count;
130  int dref_id;
132  int wrong_dts; ///< dts are wrong due to huge ctts offset (iMovie files)
133  int width; ///< tkhd width
134  int height; ///< tkhd height
135  int dts_shift; ///< dts shift when ctts is negative
136  uint32_t palette[256];
138  int64_t data_size;
139  uint32_t tmcd_flags; ///< tmcd track flags
140  int64_t track_end; ///< used for dts generation in fragmented movie files
141  int start_pad; ///< amount of samples to skip due to enc-dec delay
142  unsigned int rap_group_count;
145 
146 typedef struct MOVContext {
150  int64_t duration; ///< duration of the longest track
151  int found_moov; ///< 'moov' atom has been found
152  int found_mdat; ///< 'mdat' atom has been found
155  int isom; ///< 1 if file is ISO Media (mp4/3gp)
156  MOVFragment fragment; ///< current fragment in moof atom
158  unsigned trex_count;
159  int itunes_metadata; ///< metadata are itunes style
163  int64_t next_root_atom; ///< offset of the next root atom
164 } MOVContext;
165 
169 void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id);
170 
171 #define MP4ODescrTag 0x01
172 #define MP4IODescrTag 0x02
173 #define MP4ESDescrTag 0x03
174 #define MP4DecConfigDescrTag 0x04
175 #define MP4DecSpecificDescrTag 0x05
176 #define MP4SLDescrTag 0x06
177 
178 #define MOV_TFHD_BASE_DATA_OFFSET 0x01
179 #define MOV_TFHD_STSD_ID 0x02
180 #define MOV_TFHD_DEFAULT_DURATION 0x08
181 #define MOV_TFHD_DEFAULT_SIZE 0x10
182 #define MOV_TFHD_DEFAULT_FLAGS 0x20
183 #define MOV_TFHD_DURATION_IS_EMPTY 0x010000
184 
185 #define MOV_TRUN_DATA_OFFSET 0x01
186 #define MOV_TRUN_FIRST_SAMPLE_FLAGS 0x04
187 #define MOV_TRUN_SAMPLE_DURATION 0x100
188 #define MOV_TRUN_SAMPLE_SIZE 0x200
189 #define MOV_TRUN_SAMPLE_FLAGS 0x400
190 #define MOV_TRUN_SAMPLE_CTS 0x800
191 
192 #define MOV_FRAG_SAMPLE_FLAG_DEGRADATION_PRIORITY_MASK 0x0000ffff
193 #define MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC 0x00010000
194 #define MOV_FRAG_SAMPLE_FLAG_PADDING_MASK 0x000e0000
195 #define MOV_FRAG_SAMPLE_FLAG_REDUNDANCY_MASK 0x00300000
196 #define MOV_FRAG_SAMPLE_FLAG_DEPENDED_MASK 0x00c00000
197 #define MOV_FRAG_SAMPLE_FLAG_DEPENDS_MASK 0x03000000
198 
199 #define MOV_FRAG_SAMPLE_FLAG_DEPENDS_NO 0x02000000
200 #define MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES 0x01000000
201 
204 
205 int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries);
206 void ff_mov_write_chan(AVIOContext *pb, int64_t channel_layout);
207 
208 #endif /* AVFORMAT_ISOM_H */