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-rw-r--r--media/ffvpx/libavutil/threadmessage.c240
1 files changed, 240 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/threadmessage.c b/media/ffvpx/libavutil/threadmessage.c
new file mode 100644
index 0000000000..20b3882033
--- /dev/null
+++ b/media/ffvpx/libavutil/threadmessage.c
@@ -0,0 +1,240 @@
+/*
+ * Copyright (c) 2014 Nicolas George
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <limits.h>
+#include <stddef.h>
+
+#include "error.h"
+#include "fifo.h"
+#include "mem.h"
+#include "threadmessage.h"
+#include "thread.h"
+
+struct AVThreadMessageQueue {
+#if HAVE_THREADS
+ AVFifo *fifo;
+ pthread_mutex_t lock;
+ pthread_cond_t cond_recv;
+ pthread_cond_t cond_send;
+ int err_send;
+ int err_recv;
+ unsigned elsize;
+ void (*free_func)(void *msg);
+#else
+ int dummy;
+#endif
+};
+
+int av_thread_message_queue_alloc(AVThreadMessageQueue **mq,
+ unsigned nelem,
+ unsigned elsize)
+{
+#if HAVE_THREADS
+ AVThreadMessageQueue *rmq;
+ int ret = 0;
+
+ if (nelem > INT_MAX / elsize)
+ return AVERROR(EINVAL);
+ if (!(rmq = av_mallocz(sizeof(*rmq))))
+ return AVERROR(ENOMEM);
+ if ((ret = pthread_mutex_init(&rmq->lock, NULL))) {
+ av_free(rmq);
+ return AVERROR(ret);
+ }
+ if ((ret = pthread_cond_init(&rmq->cond_recv, NULL))) {
+ pthread_mutex_destroy(&rmq->lock);
+ av_free(rmq);
+ return AVERROR(ret);
+ }
+ if ((ret = pthread_cond_init(&rmq->cond_send, NULL))) {
+ pthread_cond_destroy(&rmq->cond_recv);
+ pthread_mutex_destroy(&rmq->lock);
+ av_free(rmq);
+ return AVERROR(ret);
+ }
+ if (!(rmq->fifo = av_fifo_alloc2(nelem, elsize, 0))) {
+ pthread_cond_destroy(&rmq->cond_send);
+ pthread_cond_destroy(&rmq->cond_recv);
+ pthread_mutex_destroy(&rmq->lock);
+ av_free(rmq);
+ return AVERROR(ENOMEM);
+ }
+ rmq->elsize = elsize;
+ *mq = rmq;
+ return 0;
+#else
+ *mq = NULL;
+ return AVERROR(ENOSYS);
+#endif /* HAVE_THREADS */
+}
+
+void av_thread_message_queue_set_free_func(AVThreadMessageQueue *mq,
+ void (*free_func)(void *msg))
+{
+#if HAVE_THREADS
+ mq->free_func = free_func;
+#endif
+}
+
+void av_thread_message_queue_free(AVThreadMessageQueue **mq)
+{
+#if HAVE_THREADS
+ if (*mq) {
+ av_thread_message_flush(*mq);
+ av_fifo_freep2(&(*mq)->fifo);
+ pthread_cond_destroy(&(*mq)->cond_send);
+ pthread_cond_destroy(&(*mq)->cond_recv);
+ pthread_mutex_destroy(&(*mq)->lock);
+ av_freep(mq);
+ }
+#endif
+}
+
+int av_thread_message_queue_nb_elems(AVThreadMessageQueue *mq)
+{
+#if HAVE_THREADS
+ int ret;
+ pthread_mutex_lock(&mq->lock);
+ ret = av_fifo_can_read(mq->fifo);
+ pthread_mutex_unlock(&mq->lock);
+ return ret;
+#else
+ return AVERROR(ENOSYS);
+#endif
+}
+
+#if HAVE_THREADS
+
+static int av_thread_message_queue_send_locked(AVThreadMessageQueue *mq,
+ void *msg,
+ unsigned flags)
+{
+ while (!mq->err_send && !av_fifo_can_write(mq->fifo)) {
+ if ((flags & AV_THREAD_MESSAGE_NONBLOCK))
+ return AVERROR(EAGAIN);
+ pthread_cond_wait(&mq->cond_send, &mq->lock);
+ }
+ if (mq->err_send)
+ return mq->err_send;
+ av_fifo_write(mq->fifo, msg, 1);
+ /* one message is sent, signal one receiver */
+ pthread_cond_signal(&mq->cond_recv);
+ return 0;
+}
+
+static int av_thread_message_queue_recv_locked(AVThreadMessageQueue *mq,
+ void *msg,
+ unsigned flags)
+{
+ while (!mq->err_recv && !av_fifo_can_read(mq->fifo)) {
+ if ((flags & AV_THREAD_MESSAGE_NONBLOCK))
+ return AVERROR(EAGAIN);
+ pthread_cond_wait(&mq->cond_recv, &mq->lock);
+ }
+ if (!av_fifo_can_read(mq->fifo))
+ return mq->err_recv;
+ av_fifo_read(mq->fifo, msg, 1);
+ /* one message space appeared, signal one sender */
+ pthread_cond_signal(&mq->cond_send);
+ return 0;
+}
+
+#endif /* HAVE_THREADS */
+
+int av_thread_message_queue_send(AVThreadMessageQueue *mq,
+ void *msg,
+ unsigned flags)
+{
+#if HAVE_THREADS
+ int ret;
+
+ pthread_mutex_lock(&mq->lock);
+ ret = av_thread_message_queue_send_locked(mq, msg, flags);
+ pthread_mutex_unlock(&mq->lock);
+ return ret;
+#else
+ return AVERROR(ENOSYS);
+#endif /* HAVE_THREADS */
+}
+
+int av_thread_message_queue_recv(AVThreadMessageQueue *mq,
+ void *msg,
+ unsigned flags)
+{
+#if HAVE_THREADS
+ int ret;
+
+ pthread_mutex_lock(&mq->lock);
+ ret = av_thread_message_queue_recv_locked(mq, msg, flags);
+ pthread_mutex_unlock(&mq->lock);
+ return ret;
+#else
+ return AVERROR(ENOSYS);
+#endif /* HAVE_THREADS */
+}
+
+void av_thread_message_queue_set_err_send(AVThreadMessageQueue *mq,
+ int err)
+{
+#if HAVE_THREADS
+ pthread_mutex_lock(&mq->lock);
+ mq->err_send = err;
+ pthread_cond_broadcast(&mq->cond_send);
+ pthread_mutex_unlock(&mq->lock);
+#endif /* HAVE_THREADS */
+}
+
+void av_thread_message_queue_set_err_recv(AVThreadMessageQueue *mq,
+ int err)
+{
+#if HAVE_THREADS
+ pthread_mutex_lock(&mq->lock);
+ mq->err_recv = err;
+ pthread_cond_broadcast(&mq->cond_recv);
+ pthread_mutex_unlock(&mq->lock);
+#endif /* HAVE_THREADS */
+}
+
+#if HAVE_THREADS
+static int free_func_wrap(void *arg, void *buf, size_t *nb_elems)
+{
+ AVThreadMessageQueue *mq = arg;
+ uint8_t *msg = buf;
+ for (size_t i = 0; i < *nb_elems; i++)
+ mq->free_func(msg + i * mq->elsize);
+ return 0;
+}
+#endif
+
+void av_thread_message_flush(AVThreadMessageQueue *mq)
+{
+#if HAVE_THREADS
+ size_t used;
+
+ pthread_mutex_lock(&mq->lock);
+ used = av_fifo_can_read(mq->fifo);
+ if (mq->free_func)
+ av_fifo_read_to_cb(mq->fifo, free_func_wrap, mq, &used);
+ /* only the senders need to be notified since the queue is empty and there
+ * is nothing to read */
+ pthread_cond_broadcast(&mq->cond_send);
+ pthread_mutex_unlock(&mq->lock);
+#endif /* HAVE_THREADS */
+}
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