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https://gitee.com/openharmony/third_party_ffmpeg
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lavu: add thread message API.
This commit is contained in:
Nicolas George
parent
58a10e0e2c
commit
55cc60cd6d
@ -15,6 +15,9 @@ libavutil: 2012-10-22
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API changes, most recent first:
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2014-05-26 - xxxxxxx - lavu 52.87.100 - threadmessage.h
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Add thread message queue API.
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2014-05-26 - c37d179 - lavf 55.41.100 - avformat.h
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Add format_probesize to AVFormatContext.
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@ -52,6 +52,7 @@ HEADERS = adler32.h \
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sha.h \
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sha512.h \
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stereo3d.h \
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threadmessage.h \
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time.h \
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timecode.h \
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timestamp.h \
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@ -119,6 +120,7 @@ OBJS = adler32.o \
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sha.o \
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sha512.o \
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stereo3d.o \
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threadmessage.o \
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time.o \
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timecode.o \
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tree.o \
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184
libavutil/threadmessage.c
Normal file
184
libavutil/threadmessage.c
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@ -0,0 +1,184 @@
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/*
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* Copyright (c) 2014 Nicolas George
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*
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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 License
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* 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
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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 License
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "fifo.h"
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#include "threadmessage.h"
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#if HAVE_THREADS
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#if HAVE_PTHREADS
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#include <pthread.h>
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#elif HAVE_W32THREADS
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#include "compat/w32pthreads.h"
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#elif HAVE_OS2THREADS
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#include "compat/os2threads.h"
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#else
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#error "Unknown threads implementation"
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#endif
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#endif
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struct AVThreadMessageQueue {
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#if HAVE_THREADS
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AVFifoBuffer *fifo;
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pthread_mutex_t lock;
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pthread_cond_t cond;
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int err_send;
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int err_recv;
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unsigned elsize;
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#else
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int dummy;
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#endif
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};
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int av_thread_message_queue_alloc(AVThreadMessageQueue **mq,
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unsigned nelem,
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unsigned elsize)
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{
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#if HAVE_THREADS
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AVThreadMessageQueue *rmq;
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int ret = 0;
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if (nelem > INT_MAX / elsize)
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return AVERROR(EINVAL);
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if (!(rmq = av_mallocz(sizeof(*rmq))))
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return AVERROR(ENOMEM);
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if ((ret = pthread_mutex_init(&rmq->lock, NULL))) {
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av_free(rmq);
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return AVERROR(ret);
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}
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if ((ret = pthread_cond_init(&rmq->cond, NULL))) {
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pthread_mutex_destroy(&rmq->lock);
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av_free(rmq);
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return AVERROR(ret);
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}
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if (!(rmq->fifo = av_fifo_alloc(elsize * nelem))) {
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pthread_cond_destroy(&rmq->cond);
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pthread_mutex_destroy(&rmq->lock);
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av_free(rmq);
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return AVERROR(ret);
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}
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rmq->elsize = elsize;
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*mq = rmq;
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return 0;
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#else
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*mq = NULL;
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return AVERROR(ENOSYS);
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#endif /* HAVE_THREADS */
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}
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void av_thread_message_queue_free(AVThreadMessageQueue **mq)
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{
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#if HAVE_THREADS
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if (*mq) {
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av_fifo_freep(&(*mq)->fifo);
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pthread_cond_destroy(&(*mq)->cond);
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pthread_mutex_destroy(&(*mq)->lock);
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av_freep(mq);
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}
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#endif
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}
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#if HAVE_THREADS
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static int av_thread_message_queue_send_locked(AVThreadMessageQueue *mq,
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void *msg,
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unsigned flags)
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{
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while (!mq->err_send && av_fifo_space(mq->fifo) < mq->elsize) {
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if ((flags & AV_THREAD_MESSAGE_NONBLOCK))
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return AVERROR(EAGAIN);
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pthread_cond_wait(&mq->cond, &mq->lock);
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}
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if (mq->err_send)
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return mq->err_send;
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av_fifo_generic_write(mq->fifo, msg, mq->elsize, NULL);
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pthread_cond_signal(&mq->cond);
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return 0;
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}
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static int av_thread_message_queue_recv_locked(AVThreadMessageQueue *mq,
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void *msg,
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unsigned flags)
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{
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while (!mq->err_recv && av_fifo_size(mq->fifo) < mq->elsize) {
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if ((flags & AV_THREAD_MESSAGE_NONBLOCK))
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return AVERROR(EAGAIN);
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pthread_cond_wait(&mq->cond, &mq->lock);
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}
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if (av_fifo_size(mq->fifo) < mq->elsize)
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return mq->err_recv;
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av_fifo_generic_read(mq->fifo, msg, mq->elsize, NULL);
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pthread_cond_signal(&mq->cond);
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return 0;
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}
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#endif /* HAVE_THREADS */
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int av_thread_message_queue_send(AVThreadMessageQueue *mq,
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void *msg,
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unsigned flags)
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{
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#if HAVE_THREADS
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int ret;
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pthread_mutex_lock(&mq->lock);
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ret = av_thread_message_queue_send_locked(mq, msg, flags);
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pthread_mutex_unlock(&mq->lock);
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return ret;
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#else
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return AVERROR(ENOSYS);
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#endif /* HAVE_THREADS */
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}
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int av_thread_message_queue_recv(AVThreadMessageQueue *mq,
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void *msg,
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unsigned flags)
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{
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#if HAVE_THREADS
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int ret;
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pthread_mutex_lock(&mq->lock);
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ret = av_thread_message_queue_recv_locked(mq, msg, flags);
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pthread_mutex_unlock(&mq->lock);
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return ret;
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#else
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return AVERROR(ENOSYS);
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#endif /* HAVE_THREADS */
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}
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void av_thread_message_queue_set_err_send(AVThreadMessageQueue *mq,
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int err)
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{
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#if HAVE_THREADS
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pthread_mutex_lock(&mq->lock);
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mq->err_send = err;
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pthread_cond_broadcast(&mq->cond);
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pthread_mutex_unlock(&mq->lock);
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#endif /* HAVE_THREADS */
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}
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void av_thread_message_queue_set_err_recv(AVThreadMessageQueue *mq,
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int err)
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{
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#if HAVE_THREADS
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pthread_mutex_lock(&mq->lock);
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mq->err_recv = err;
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pthread_cond_broadcast(&mq->cond);
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pthread_mutex_unlock(&mq->lock);
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#endif /* HAVE_THREADS */
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}
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91
libavutil/threadmessage.h
Normal file
91
libavutil/threadmessage.h
Normal file
@ -0,0 +1,91 @@
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/*
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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 License
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* 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
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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 License
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_THREADMESSAGE_H
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#define AVUTIL_THREADMESSAGE_H
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typedef struct AVThreadMessageQueue AVThreadMessageQueue;
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typedef enum AVThreadMessageFlags {
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/**
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* Perform non-blocking operation.
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* If this flag is set, send and recv operations are non-blocking and
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* return AVERROR(EAGAIN) immediately if they can not proceed.
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*/
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AV_THREAD_MESSAGE_NONBLOCK = 1,
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} AVThreadMessageFlags;
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/**
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* Allocate a new message queue.
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*
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* @param mq pointer to the message queue
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* @param nelem maximum number of elements in the queue
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* @param elsize size of each element in the queue
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* @return >=0 for success; <0 for error, in particular AVERROR(ENOSYS) if
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* lavu was built without thread support
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*/
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int av_thread_message_queue_alloc(AVThreadMessageQueue **mq,
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unsigned nelem,
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unsigned elsize);
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/**
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* Free a message queue.
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*
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* The message queue must no longer be in use by another thread.
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*/
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void av_thread_message_queue_free(AVThreadMessageQueue **mq);
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/**
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* Send a message on the queue.
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*/
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int av_thread_message_queue_send(AVThreadMessageQueue *mq,
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void *msg,
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unsigned flags);
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/**
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* Receive a message from the queue.
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*/
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int av_thread_message_queue_recv(AVThreadMessageQueue *mq,
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void *msg,
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unsigned flags);
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/**
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* Set the sending error code.
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*
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* If the error code is set to non-zero, av_thread_message_queue_recv() will
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* return it immediately when there are no longer available messages.
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* Conventional values, such as AVERROR_EOF or AVERROR(EAGAIN), can be used
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* to cause the receiving thread to stop or suspend its operation.
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*/
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void av_thread_message_queue_set_err_send(AVThreadMessageQueue *mq,
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int err);
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/**
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* Set the receiving error code.
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*
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* If the error code is set to non-zero, av_thread_message_queue_send() will
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* return it immediately. Conventional values, such as AVERROR_EOF or
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* AVERROR(EAGAIN), can be used to cause the sending thread to stop or
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* suspend its operation.
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*/
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void av_thread_message_queue_set_err_recv(AVThreadMessageQueue *mq,
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int err);
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#endif /* AVUTIL_THREADMESSAGE_H */
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@ -56,7 +56,7 @@
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*/
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#define LIBAVUTIL_VERSION_MAJOR 52
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#define LIBAVUTIL_VERSION_MINOR 86
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#define LIBAVUTIL_VERSION_MINOR 87
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#define LIBAVUTIL_VERSION_MICRO 100
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#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
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