mirror of
https://github.com/mpv-player/mpv
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6c8362ef54
The main change is that we wait with opening the muxer ("writing
headers") until we have data from all streams. This fixes race
conditions at init due to broken assumptions in the old code.
This also changes a lot of other stuff. I found and fixed a few API
violations (often things for which better mechanisms were invented, and
the old ones are not valid anymore). I try to get away from the public
mutex and shared fields in encode_lavc_context. For now it's still
needed for some timestamp-related fields, but most are gone. It also
removes some bad code duplication between audio and video paths.
112 lines
3.5 KiB
C
112 lines
3.5 KiB
C
/*
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* muxing using libavformat
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*
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* Copyright (C) 2011 Rudolf Polzer <divVerent@xonotic.org>
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*
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* This file is part of mpv.
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*
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* mpv 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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* mpv 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
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* GNU 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 mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MPLAYER_ENCODE_LAVC_H
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#define MPLAYER_ENCODE_LAVC_H
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#include <pthread.h>
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#include <libavcodec/avcodec.h>
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#include <libavformat/avformat.h>
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#include <libavutil/avstring.h>
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#include <libavutil/pixfmt.h>
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#include <libavutil/opt.h>
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#include <libavutil/mathematics.h>
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#include "common/common.h"
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#include "encode.h"
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#include "video/csputils.h"
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struct encode_lavc_context {
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// --- Immutable after init
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struct mpv_global *global;
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struct encode_opts *options;
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struct mp_log *log;
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struct encode_priv *priv;
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AVOutputFormat *oformat;
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const char *filename;
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// All entry points must be guarded with the lock. Functions called by
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// the playback core lock this automatically, but ao_lavc.c and vo_lavc.c
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// must lock manually before accessing state.
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pthread_mutex_t lock;
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// sync to audio mode
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double audio_pts_offset;
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double last_audio_in_pts;
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int64_t samples_since_last_pts;
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// anti discontinuity mode
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double next_in_pts;
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double discontinuity_pts_offset;
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};
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// --- interface for vo/ao drivers
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// Static information after encoder init. This never changes (even if there are
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// dynamic runtime changes, they have to work over AVPacket side data).
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// For use in encoder_context, most fields are copied from encoder_context.encoder
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// by encoder_init_codec_and_muxer().
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struct encoder_stream_info {
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AVRational timebase; // timebase used by the encoder (in frames/out packets)
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AVCodecParameters *codecpar;
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};
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// The encoder parts for each stream (no muxing parts included).
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// This is private to each stream.
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struct encoder_context {
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struct mpv_global *global;
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struct encode_opts *options;
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struct mp_log *log;
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AVOutputFormat *oformat;
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// (avoid using this)
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struct encode_lavc_context *encode_lavc_ctx;
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enum stream_type type;
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// (different access restrictions before/after encoder init)
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struct encoder_stream_info info;
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AVCodecContext *encoder;
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struct mux_stream *mux_stream;
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struct stream *twopass_bytebuffer;
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};
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// Free with talloc_free(). (Keep in mind actual deinitialization requires
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// sending a flush packet.)
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// This can fail and return NULL.
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struct encoder_context *encoder_context_alloc(struct encode_lavc_context *ctx,
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enum stream_type type,
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struct mp_log *log);
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// After setting your codec parameters on p->encoder, you call this to "open"
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// the encoder. This also initializes p->mux_stream. Returns false on failure.
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bool encoder_init_codec_and_muxer(struct encoder_context *p);
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// Encode the frame and write the packet. frame is ref'ed as need.
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bool encoder_encode(struct encoder_context *p, AVFrame *frame);
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double encoder_get_offset(struct encoder_context *p);
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#endif
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