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37c764df67
It is similar to AVThreadMessageQueue, but supports multiple streams, each with its own EOF state.
82 lines
3.1 KiB
C
82 lines
3.1 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_THREAD_QUEUE_H
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#define FFTOOLS_THREAD_QUEUE_H
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#include <string.h>
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#include "objpool.h"
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typedef struct ThreadQueue ThreadQueue;
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/**
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* Allocate a queue for sending data between threads.
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*
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* @param nb_streams number of streams for which a distinct EOF state is
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* maintained
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* @param queue_size number of items that can be stored in the queue without
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* blocking
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* @param obj_pool object pool that will be used to allocate items stored in the
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* queue; the pool becomes owned by the queue
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* @param callback that moves the contents between two data pointers
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*/
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ThreadQueue *tq_alloc(unsigned int nb_streams, size_t queue_size,
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ObjPool *obj_pool, void (*obj_move)(void *dst, void *src));
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void tq_free(ThreadQueue **tq);
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/**
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* Send an item for the given stream to the queue.
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*
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* @param data the item to send, its contents will be moved using the callback
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* provided to tq_alloc(); on failure the item will be left
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* untouched
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* @return
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* - 0 the item was successfully sent
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* - AVERROR(ENOMEM) could not allocate an item for writing to the FIFO
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* - AVERROR(EINVAL) the sending side has previously been marked as finished
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* - AVERROR_EOF the receiving side has marked the given stream as finished
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*/
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int tq_send(ThreadQueue *tq, unsigned int stream_idx, void *data);
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/**
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* Mark the given stream finished from the sending side.
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*/
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void tq_send_finish(ThreadQueue *tq, unsigned int stream_idx);
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/**
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* Read the next item from the queue.
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*
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* @param stream_idx the index of the stream that was processed or -1 will be
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* written here
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* @param data the data item will be written here on success using the
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* callback provided to tq_alloc()
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* @return
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* - 0 a data item was successfully read; *stream_idx contains a non-negative
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* stream index
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* - AVERROR_EOF When *stream_idx is non-negative, this signals that the sending
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* side has marked the given stream as finished. This will happen at most once
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* for each stream. When *stream_idx is -1, all streams are done.
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*/
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int tq_receive(ThreadQueue *tq, int *stream_idx, void *data);
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/**
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* Mark the given stream finished from the receiving side.
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*/
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void tq_receive_finish(ThreadQueue *tq, unsigned int stream_idx);
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#endif // FFTOOLS_THREAD_QUEUE_H
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