fftools/ffmpeg: move the input thread into its own file

It will contain more demuxing-specific code in the future.

1 files changed, 136 insertions, 0 deletions

diff --git a/fftools/ffmpeg_demux.c b/fftools/ffmpeg_demux.c
new file mode 100644
index 0000000000..2629af5950
--- /dev/null
+++ b/fftools/ffmpeg_demux.c
@@ -0,0 +1,136 @@
+/*
+ * 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;
+}