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/*
* 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 "ffmpeg.h"
#include "libavutil/error.h"
#include "libavutil/time.h"
#include "libavutil/thread.h"
#include "libavutil/threadmessage.h"
#include "libavcodec/packet.h"
#include "libavformat/avformat.h"
static void *input_thread(void *arg)
{
InputFile *f = arg;
AVPacket *pkt = f->pkt, *queue_pkt;
unsigned flags = f->non_blocking ? AV_THREAD_MESSAGE_NONBLOCK : 0;
int ret = 0;
while (1) {
ret = av_read_frame(f->ctx, pkt);
if (ret == AVERROR(EAGAIN)) {
av_usleep(10000);
continue;
}
if (ret < 0) {
av_thread_message_queue_set_err_recv(f->in_thread_queue, ret);
break;
}
queue_pkt = av_packet_alloc();
if (!queue_pkt) {
av_packet_unref(pkt);
av_thread_message_queue_set_err_recv(f->in_thread_queue, AVERROR(ENOMEM));
break;
}
av_packet_move_ref(queue_pkt, pkt);
ret = av_thread_message_queue_send(f->in_thread_queue, &queue_pkt, flags);
if (flags && ret == AVERROR(EAGAIN)) {
flags = 0;
ret = av_thread_message_queue_send(f->in_thread_queue, &queue_pkt, flags);
av_log(f->ctx, AV_LOG_WARNING,
"Thread message queue blocking; consider raising the "
"thread_queue_size option (current value: %d)\n",
f->thread_queue_size);
}
if (ret < 0) {
if (ret != AVERROR_EOF)
av_log(f->ctx, AV_LOG_ERROR,
"Unable to send packet to main thread: %s\n",
av_err2str(ret));
av_packet_free(&queue_pkt);
av_thread_message_queue_set_err_recv(f->in_thread_queue, ret);
break;
}
}
return NULL;
}
void free_input_thread(int i)
{
InputFile *f = input_files[i];
AVPacket *pkt;
if (!f || !f->in_thread_queue)
return;
av_thread_message_queue_set_err_send(f->in_thread_queue, AVERROR_EOF);
while (av_thread_message_queue_recv(f->in_thread_queue, &pkt, 0) >= 0)
av_packet_free(&pkt);
pthread_join(f->thread, NULL);
av_thread_message_queue_free(&f->in_thread_queue);
}
void free_input_threads(void)
{
int i;
for (i = 0; i < nb_input_files; i++)
free_input_thread(i);
}
int init_input_thread(int i)
{
int ret;
InputFile *f = input_files[i];
if (f->thread_queue_size <= 0)
f->thread_queue_size = (nb_input_files > 1 ? 8 : 1);
if (f->ctx->pb ? !f->ctx->pb->seekable :
strcmp(f->ctx->iformat->name, "lavfi"))
f->non_blocking = 1;
ret = av_thread_message_queue_alloc(&f->in_thread_queue,
f->thread_queue_size, sizeof(f->pkt));
if (ret < 0)
return ret;
if ((ret = pthread_create(&f->thread, NULL, input_thread, f))) {
av_log(NULL, AV_LOG_ERROR, "pthread_create failed: %s. Try to increase `ulimit -v` or decrease `ulimit -s`.\n", strerror(ret));
av_thread_message_queue_free(&f->in_thread_queue);
return AVERROR(ret);
}
return 0;
}
int init_input_threads(void)
{
int i, ret;
for (i = 0; i < nb_input_files; i++) {
ret = init_input_thread(i);
if (ret < 0)
return ret;
}
return 0;
}
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