2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #ifndef FFTOOLS_SYNC_QUEUE_H
20 #define FFTOOLS_SYNC_QUEUE_H
24 #include "libavcodec/packet.h"
26 #include "libavutil/frame.h"
33 typedef union SyncQueueFrame {
38 #define SQFRAME(frame) ((SyncQueueFrame){ .f = (frame) })
39 #define SQPKT(pkt) ((SyncQueueFrame){ .p = (pkt) })
42 * A sync queue provides timestamp synchronization between multiple streams.
43 * Some of these streams are marked as "limiting", then the queue ensures no
44 * stream gets ahead of any of the limiting streams.
46 typedef struct SyncQueue SyncQueue;
49 * Allocate a sync queue of the given type.
51 * @param buf_size_us maximum duration that will be buffered in microseconds
53 SyncQueue *sq_alloc(enum SyncQueueType type, int64_t buf_size_us, void *logctx);
54 void sq_free(SyncQueue **sq);
57 * Add a new stream to the sync queue.
59 * @param limiting whether the stream is limiting, i.e. no other stream can be
60 * longer than this one
62 * - a non-negative stream index on success
63 * - a negative error code on error
65 int sq_add_stream(SyncQueue *sq, int limiting);
68 * Limit the number of output frames for stream with index stream_idx
71 void sq_limit_frames(SyncQueue *sq, unsigned int stream_idx,
75 * Set a constant output audio frame size, in samples. Can only be used with
76 * SYNC_QUEUE_FRAMES queues and audio streams.
78 * All output frames will have exactly frame_samples audio samples, except
79 * possibly for the last one, which may have fewer.
81 void sq_frame_samples(SyncQueue *sq, unsigned int stream_idx,
85 * Submit a frame for the stream with index stream_idx.
87 * On success, the sync queue takes ownership of the frame and will reset the
88 * contents of the supplied frame. On failure, the frame remains owned by the
91 * Sending a frame with NULL contents marks the stream as finished.
95 * - AVERROR_EOF when no more frames should be submitted for this stream
96 * - another a negative error code on failure
98 int sq_send(SyncQueue *sq, unsigned int stream_idx, SyncQueueFrame frame);
101 * Read a frame from the queue.
103 * @param stream_idx index of the stream to read a frame for. May be -1, then
104 * try to read a frame from any stream that is ready for
106 * @param frame output frame will be written here on success. The frame is owned
110 * - a non-negative index of the stream to which the returned frame belongs
111 * - AVERROR(EAGAIN) when more frames need to be submitted to the queue
112 * - AVERROR_EOF when no more frames will be available for this stream (for any
113 * stream if stream_idx is -1)
114 * - another negative error code on failure
116 int sq_receive(SyncQueue *sq, int stream_idx, SyncQueueFrame frame);
118 #endif // FFTOOLS_SYNC_QUEUE_H