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Currently, AVStream contains an embedded AVCodecContext instance, which
is used by demuxers to export stream parameters to the caller and by
muxers to receive stream parameters from the caller. It is also used
internally as the codec context that is passed to parsers.
In addition, it is also widely used by the callers as the decoding (when
demuxer) or encoding (when muxing) context, though this has been
officially discouraged since Libav 11.
There are multiple important problems with this approach:
- the fields in AVCodecContext are in general one of
* stream parameters
* codec options
* codec state
However, it's not clear which ones are which. It is consequently
unclear which fields are a demuxer allowed to set or a muxer allowed to
read. This leads to erratic behaviour depending on whether decoding or
encoding is being performed or not (and whether it uses the AVStream
embedded codec context).
- various synchronization issues arising from the fact that the same
context is used by several different APIs (muxers/demuxers,
parsers, bitstream filters and encoders/decoders) simultaneously, with
there being no clear rules for who can modify what and the different
processes being typically delayed with respect to each other.
- avformat_find_stream_info() making it necessary to support opening
and closing a single codec context multiple times, thus
complicating the semantics of freeing various allocated objects in the
codec context.
Those problems are resolved by replacing the AVStream embedded codec
context with a newly added AVCodecParameters instance, which stores only
the stream parameters exported by the demuxers or read by the muxers.
206 lines
5.9 KiB
C
206 lines
5.9 KiB
C
/*
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* MOV, 3GP, MP4 muxer
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* Copyright (c) 2003 Thomas Raivio
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* Copyright (c) 2004 Gildas Bazin <gbazin at videolan dot org>
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* Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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_MOVENC_H
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#define AVFORMAT_MOVENC_H
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#include "avformat.h"
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#define MOV_FRAG_INFO_ALLOC_INCREMENT 64
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#define MOV_INDEX_CLUSTER_SIZE 1024
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#define MOV_TIMESCALE 1000
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#define RTP_MAX_PACKET_SIZE 1450
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#define MODE_MP4 0x01
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#define MODE_MOV 0x02
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#define MODE_3GP 0x04
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#define MODE_PSP 0x08 // example working PSP command line:
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// avconv -i testinput.avi -f psp -r 14.985 -s 320x240 -b 768 -ar 24000 -ab 32 M4V00001.MP4
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#define MODE_3G2 0x10
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#define MODE_IPOD 0x20
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#define MODE_ISM 0x40
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#define MODE_F4V 0x80
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typedef struct MOVIentry {
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uint64_t pos;
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int64_t dts;
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unsigned int size;
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unsigned int samples_in_chunk;
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unsigned int entries;
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int cts;
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#define MOV_SYNC_SAMPLE 0x0001
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#define MOV_PARTIAL_SYNC_SAMPLE 0x0002
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uint32_t flags;
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} MOVIentry;
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typedef struct HintSample {
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uint8_t *data;
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int size;
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int sample_number;
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int offset;
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int own_data;
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} HintSample;
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typedef struct HintSampleQueue {
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int size;
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int len;
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HintSample *samples;
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} HintSampleQueue;
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typedef struct MOVFragmentInfo {
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int64_t offset;
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int64_t time;
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int64_t duration;
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int64_t tfrf_offset;
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int size;
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} MOVFragmentInfo;
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typedef struct MOVTrack {
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int mode;
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int entry;
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unsigned timescale;
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uint64_t time;
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int64_t track_duration;
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long sample_count;
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long sample_size;
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int has_keyframes;
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#define MOV_TRACK_CTTS 0x0001
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#define MOV_TRACK_STPS 0x0002
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#define MOV_TRACK_ENABLED 0x0004
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uint32_t flags;
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int language;
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int track_id;
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int tag; ///< stsd fourcc
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AVStream *st;
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AVCodecParameters *par;
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int vos_len;
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uint8_t *vos_data;
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MOVIentry *cluster;
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unsigned cluster_capacity;
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int audio_vbr;
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int height; ///< active picture (w/o VBI) height for D-10/IMX
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uint32_t tref_tag;
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int tref_id; ///< trackID of the referenced track
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int64_t start_dts;
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int64_t start_cts;
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int64_t end_pts;
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int hint_track; ///< the track that hints this track, -1 if no hint track is set
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int src_track; ///< the track that this hint track describes
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AVFormatContext *rtp_ctx; ///< the format context for the hinting rtp muxer
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uint32_t prev_rtp_ts;
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int64_t cur_rtp_ts_unwrapped;
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uint32_t max_packet_size;
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int64_t default_duration;
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uint32_t default_sample_flags;
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uint32_t default_size;
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HintSampleQueue sample_queue;
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AVIOContext *mdat_buf;
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int64_t data_offset;
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int64_t frag_start;
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int frag_discont;
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int entries_flushed;
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int nb_frag_info;
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MOVFragmentInfo *frag_info;
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unsigned frag_info_capacity;
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struct {
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int first_packet_seq;
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int first_packet_entry;
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int first_packet_seen;
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int first_frag_written;
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int packet_seq;
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int packet_entry;
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int slices;
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} vc1_info;
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} MOVTrack;
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typedef struct MOVMuxContext {
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const AVClass *av_class;
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int mode;
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int64_t time;
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int nb_streams;
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int chapter_track; ///< qt chapter track number
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int64_t mdat_pos;
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uint64_t mdat_size;
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MOVTrack *tracks;
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int flags;
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int rtp_flags;
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int iods_skip;
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int iods_video_profile;
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int iods_audio_profile;
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int moov_written;
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int fragments;
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int max_fragment_duration;
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int min_fragment_duration;
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int max_fragment_size;
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int ism_lookahead;
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AVIOContext *mdat_buf;
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int first_trun;
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int64_t reserved_header_pos;
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char *major_brand;
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int per_stream_grouping;
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AVFormatContext *fc;
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int use_editlist;
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int frag_interleave;
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int missing_duration_warned;
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} MOVMuxContext;
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#define FF_MOV_FLAG_RTP_HINT (1 << 0)
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#define FF_MOV_FLAG_FRAGMENT (1 << 1)
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#define FF_MOV_FLAG_EMPTY_MOOV (1 << 2)
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#define FF_MOV_FLAG_FRAG_KEYFRAME (1 << 3)
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#define FF_MOV_FLAG_SEPARATE_MOOF (1 << 4)
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#define FF_MOV_FLAG_FRAG_CUSTOM (1 << 5)
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#define FF_MOV_FLAG_ISML (1 << 6)
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#define FF_MOV_FLAG_FASTSTART (1 << 7)
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#define FF_MOV_FLAG_OMIT_TFHD_OFFSET (1 << 8)
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#define FF_MOV_FLAG_DISABLE_CHPL (1 << 9)
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#define FF_MOV_FLAG_DEFAULT_BASE_MOOF (1 << 10)
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#define FF_MOV_FLAG_DASH (1 << 11)
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#define FF_MOV_FLAG_FRAG_DISCONT (1 << 12)
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#define FF_MOV_FLAG_DELAY_MOOV (1 << 13)
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#define FF_MOV_FLAG_GLOBAL_SIDX (1 << 14)
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int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt);
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int ff_mov_init_hinting(AVFormatContext *s, int index, int src_index);
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int ff_mov_add_hinted_packet(AVFormatContext *s, AVPacket *pkt,
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int track_index, int sample,
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uint8_t *sample_data, int sample_size);
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void ff_mov_close_hinting(MOVTrack *track);
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#endif /* AVFORMAT_MOVENC_H */
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