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414d6547f3
The current behavior may produce a different sequence of packets after seeking, compared to demuxing linearly from the beginning. This is because the MOV demuxer seeks in each stream individually, based on timestamp, which may set each stream at a slightly different position than if the file would have been read sequentially. This makes implementing certain operations, such as segmenting, quite hard, and slower than need be. Therefore, add an option which retains the same packet sequence after seeking, as when a file is demuxed linearly.
273 lines
8.6 KiB
C
273 lines
8.6 KiB
C
/*
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* ISO Media common code
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* copyright (c) 2001 Fabrice Bellard
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* copyright (c) 2002 Francois Revol <revol@free.fr>
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* copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFORMAT_ISOM_H
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#define AVFORMAT_ISOM_H
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#include "avio.h"
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#include "internal.h"
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#include "dv.h"
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/* isom.c */
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extern const AVCodecTag ff_mp4_obj_type[];
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extern const AVCodecTag ff_codec_movvideo_tags[];
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extern const AVCodecTag ff_codec_movaudio_tags[];
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extern const AVCodecTag ff_codec_movsubtitle_tags[];
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int ff_mov_iso639_to_lang(const char lang[4], int mp4);
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int ff_mov_lang_to_iso639(unsigned code, char to[4]);
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/* the QuickTime file format is quite convoluted...
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* it has lots of index tables, each indexing something in another one...
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* Here we just use what is needed to read the chunks
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*/
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typedef struct MOVStts {
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int count;
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int duration;
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} MOVStts;
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typedef struct MOVStsc {
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int first;
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int count;
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int id;
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} MOVStsc;
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typedef struct MOVElst {
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int64_t duration;
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int64_t time;
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float rate;
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} MOVElst;
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typedef struct MOVDref {
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uint32_t type;
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char *path;
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char *dir;
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char volume[28];
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char filename[64];
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int16_t nlvl_to, nlvl_from;
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} MOVDref;
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typedef struct MOVAtom {
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uint32_t type;
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int64_t size; /* total size (excluding the size and type fields) */
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} MOVAtom;
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struct MOVParseTableEntry;
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typedef struct MOVFragment {
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unsigned track_id;
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uint64_t base_data_offset;
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uint64_t moof_offset;
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uint64_t implicit_offset;
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unsigned stsd_id;
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unsigned duration;
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unsigned size;
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unsigned flags;
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int64_t time;
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} MOVFragment;
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typedef struct MOVTrackExt {
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unsigned track_id;
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unsigned stsd_id;
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unsigned duration;
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unsigned size;
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unsigned flags;
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} MOVTrackExt;
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typedef struct MOVSbgp {
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unsigned int count;
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unsigned int index;
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} MOVSbgp;
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typedef struct MOVFragmentIndexItem {
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int64_t moof_offset;
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int64_t time;
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} MOVFragmentIndexItem;
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typedef struct MOVFragmentIndex {
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unsigned track_id;
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unsigned item_count;
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unsigned current_item;
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MOVFragmentIndexItem *items;
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} MOVFragmentIndex;
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typedef struct MOVStreamContext {
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AVIOContext *pb;
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int pb_is_copied;
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int ffindex; ///< AVStream index
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int next_chunk;
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unsigned int chunk_count;
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int64_t *chunk_offsets;
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unsigned int stts_count;
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MOVStts *stts_data;
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unsigned int ctts_count;
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MOVStts *ctts_data;
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unsigned int stsc_count;
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MOVStsc *stsc_data;
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unsigned int stps_count;
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unsigned *stps_data; ///< partial sync sample for mpeg-2 open gop
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MOVElst *elst_data;
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unsigned int elst_count;
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int ctts_index;
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int ctts_sample;
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unsigned int sample_size; ///< may contain value calculated from stsd or value from stsz atom
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unsigned int stsz_sample_size; ///< always contains sample size from stsz atom
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unsigned int sample_count;
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int *sample_sizes;
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int keyframe_absent;
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unsigned int keyframe_count;
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int *keyframes;
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int time_scale;
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int64_t time_offset; ///< time offset of the edit list entries
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int current_sample;
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unsigned int bytes_per_frame;
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unsigned int samples_per_frame;
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int dv_audio_container;
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int pseudo_stream_id; ///< -1 means demux all ids
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int16_t audio_cid; ///< stsd audio compression id
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unsigned drefs_count;
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MOVDref *drefs;
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int dref_id;
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int timecode_track;
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int wrong_dts; ///< dts are wrong due to huge ctts offset (iMovie files)
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int width; ///< tkhd width
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int height; ///< tkhd height
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int dts_shift; ///< dts shift when ctts is negative
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uint32_t palette[256];
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int has_palette;
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int64_t data_size;
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uint32_t tmcd_flags; ///< tmcd track flags
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int64_t track_end; ///< used for dts generation in fragmented movie files
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int start_pad; ///< amount of samples to skip due to enc-dec delay
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unsigned int rap_group_count;
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MOVSbgp *rap_group;
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int nb_frames_for_fps;
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int64_t duration_for_fps;
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int32_t *display_matrix;
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} MOVStreamContext;
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typedef struct MOVContext {
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const AVClass *class; ///< class for private options
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AVFormatContext *fc;
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int time_scale;
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int64_t duration; ///< duration of the longest track
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int found_moov; ///< 'moov' atom has been found
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int found_mdat; ///< 'mdat' atom has been found
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DVDemuxContext *dv_demux;
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AVFormatContext *dv_fctx;
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int isom; ///< 1 if file is ISO Media (mp4/3gp)
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MOVFragment fragment; ///< current fragment in moof atom
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MOVTrackExt *trex_data;
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unsigned trex_count;
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int itunes_metadata; ///< metadata are itunes style
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int chapter_track;
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int use_absolute_path;
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int ignore_editlist;
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int seek_individually;
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int64_t next_root_atom; ///< offset of the next root atom
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int export_all;
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int export_xmp;
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int *bitrates; ///< bitrates read before streams creation
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int bitrates_count;
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int moov_retry;
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int use_mfra_for;
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int has_looked_for_mfra;
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MOVFragmentIndex** fragment_index_data;
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unsigned fragment_index_count;
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int atom_depth;
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} MOVContext;
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int ff_mp4_read_descr_len(AVIOContext *pb);
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int ff_mp4_read_descr(AVFormatContext *fc, AVIOContext *pb, int *tag);
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int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext *pb);
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void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id);
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#define MP4ODescrTag 0x01
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#define MP4IODescrTag 0x02
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#define MP4ESDescrTag 0x03
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#define MP4DecConfigDescrTag 0x04
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#define MP4DecSpecificDescrTag 0x05
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#define MP4SLDescrTag 0x06
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#define MOV_TFHD_BASE_DATA_OFFSET 0x01
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#define MOV_TFHD_STSD_ID 0x02
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#define MOV_TFHD_DEFAULT_DURATION 0x08
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#define MOV_TFHD_DEFAULT_SIZE 0x10
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#define MOV_TFHD_DEFAULT_FLAGS 0x20
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#define MOV_TFHD_DURATION_IS_EMPTY 0x010000
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#define MOV_TFHD_DEFAULT_BASE_IS_MOOF 0x020000
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#define MOV_TRUN_DATA_OFFSET 0x01
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#define MOV_TRUN_FIRST_SAMPLE_FLAGS 0x04
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#define MOV_TRUN_SAMPLE_DURATION 0x100
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#define MOV_TRUN_SAMPLE_SIZE 0x200
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#define MOV_TRUN_SAMPLE_FLAGS 0x400
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#define MOV_TRUN_SAMPLE_CTS 0x800
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#define MOV_FRAG_SAMPLE_FLAG_DEGRADATION_PRIORITY_MASK 0x0000ffff
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#define MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC 0x00010000
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#define MOV_FRAG_SAMPLE_FLAG_PADDING_MASK 0x000e0000
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#define MOV_FRAG_SAMPLE_FLAG_REDUNDANCY_MASK 0x00300000
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#define MOV_FRAG_SAMPLE_FLAG_DEPENDED_MASK 0x00c00000
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#define MOV_FRAG_SAMPLE_FLAG_DEPENDS_MASK 0x03000000
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#define MOV_FRAG_SAMPLE_FLAG_DEPENDS_NO 0x02000000
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#define MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES 0x01000000
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#define MOV_TKHD_FLAG_ENABLED 0x0001
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#define MOV_TKHD_FLAG_IN_MOVIE 0x0002
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#define MOV_TKHD_FLAG_IN_PREVIEW 0x0004
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#define MOV_TKHD_FLAG_IN_POSTER 0x0008
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#define TAG_IS_AVCI(tag) \
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((tag) == MKTAG('a', 'i', '5', 'p') || \
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(tag) == MKTAG('a', 'i', '5', 'q') || \
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(tag) == MKTAG('a', 'i', '5', '2') || \
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(tag) == MKTAG('a', 'i', '5', '3') || \
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(tag) == MKTAG('a', 'i', '5', '5') || \
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(tag) == MKTAG('a', 'i', '5', '6') || \
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(tag) == MKTAG('a', 'i', '1', 'p') || \
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(tag) == MKTAG('a', 'i', '1', 'q') || \
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(tag) == MKTAG('a', 'i', '1', '2') || \
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(tag) == MKTAG('a', 'i', '1', '3') || \
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(tag) == MKTAG('a', 'i', '1', '5') || \
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(tag) == MKTAG('a', 'i', '1', '6') || \
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(tag) == MKTAG('a', 'i', 'v', 'x') || \
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(tag) == MKTAG('A', 'V', 'i', 'n'))
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int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb);
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enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags);
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int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries);
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void ff_mov_write_chan(AVIOContext *pb, int64_t channel_layout);
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#define FF_MOV_FLAG_MFRA_AUTO -1
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#define FF_MOV_FLAG_MFRA_DTS 1
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#define FF_MOV_FLAG_MFRA_PTS 2
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#endif /* AVFORMAT_ISOM_H */
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