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119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/*
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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 FFTOOLS_SYNC_QUEUE_H
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#define FFTOOLS_SYNC_QUEUE_H
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#include <stdint.h>
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#include "libavcodec/packet.h"
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#include "libavutil/frame.h"
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enum SyncQueueType {
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SYNC_QUEUE_PACKETS,
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SYNC_QUEUE_FRAMES,
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};
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typedef union SyncQueueFrame {
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AVFrame *f;
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AVPacket *p;
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} SyncQueueFrame;
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#define SQFRAME(frame) ((SyncQueueFrame){ .f = (frame) })
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#define SQPKT(pkt) ((SyncQueueFrame){ .p = (pkt) })
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/**
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* A sync queue provides timestamp synchronization between multiple streams.
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* Some of these streams are marked as "limiting", then the queue ensures no
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* stream gets ahead of any of the limiting streams.
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*/
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typedef struct SyncQueue SyncQueue;
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/**
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* Allocate a sync queue of the given type.
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*
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* @param buf_size_us maximum duration that will be buffered in microseconds
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*/
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SyncQueue *sq_alloc(enum SyncQueueType type, int64_t buf_size_us);
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void sq_free(SyncQueue **sq);
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/**
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* Add a new stream to the sync queue.
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*
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* @param limiting whether the stream is limiting, i.e. no other stream can be
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* longer than this one
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* @return
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* - a non-negative stream index on success
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* - a negative error code on error
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*/
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int sq_add_stream(SyncQueue *sq, int limiting);
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/**
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* Limit the number of output frames for stream with index stream_idx
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* to max_frames.
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*/
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void sq_limit_frames(SyncQueue *sq, unsigned int stream_idx,
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uint64_t max_frames);
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/**
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* Set a constant output audio frame size, in samples. Can only be used with
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* SYNC_QUEUE_FRAMES queues and audio streams.
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*
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* All output frames will have exactly frame_samples audio samples, except
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* possibly for the last one, which may have fewer.
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*/
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void sq_frame_samples(SyncQueue *sq, unsigned int stream_idx,
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int frame_samples);
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/**
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* Submit a frame for the stream with index stream_idx.
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*
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* On success, the sync queue takes ownership of the frame and will reset the
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* contents of the supplied frame. On failure, the frame remains owned by the
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* caller.
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*
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* Sending a frame with NULL contents marks the stream as finished.
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*
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* @return
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* - 0 on success
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* - AVERROR_EOF when no more frames should be submitted for this stream
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* - another a negative error code on failure
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*/
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int sq_send(SyncQueue *sq, unsigned int stream_idx, SyncQueueFrame frame);
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/**
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* Read a frame from the queue.
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*
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* @param stream_idx index of the stream to read a frame for. May be -1, then
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* try to read a frame from any stream that is ready for
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* output.
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* @param frame output frame will be written here on success. The frame is owned
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* by the caller.
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*
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* @return
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* - a non-negative index of the stream to which the returned frame belongs
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* - AVERROR(EAGAIN) when more frames need to be submitted to the queue
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* - AVERROR_EOF when no more frames will be available for this stream (for any
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* stream if stream_idx is -1)
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* - another negative error code on failure
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*/
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int sq_receive(SyncQueue *sq, int stream_idx, SyncQueueFrame frame);
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#endif // FFTOOLS_SYNC_QUEUE_H
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