winegstreamer: Get rid of the queue_stream_event() helper.

dlls/winegstreamer/wg_parser.c

@@ -415,43 +415,6 @@ static void no_more_pads_cb(GstElement *element, gpointer user)
     pthread_cond_signal(&parser->init_cond);
 }
 
-static GstFlowReturn queue_stream_event(struct wg_parser_stream *stream,
-        const struct wg_parser_event *event, GstBuffer *buffer)
-{
-    struct wg_parser *parser = stream->parser;
-
-    /* Unlike request_buffer_src() [q.v.], we need to watch for GStreamer
-     * flushes here. The difference is that we can be blocked by the streaming
-     * thread not running (or itself flushing on the DirectShow side).
-     * request_buffer_src() can only be blocked by the upstream source, and that
-     * is solved by flushing the upstream source. */
-
-    pthread_mutex_lock(&parser->mutex);
-    while (!stream->flushing && stream->event.type != WG_PARSER_EVENT_NONE)
-        pthread_cond_wait(&stream->event_empty_cond, &parser->mutex);
-    if (stream->flushing)
-    {
-        pthread_mutex_unlock(&parser->mutex);
-        GST_DEBUG("Filter is flushing; discarding event.");
-        return GST_FLOW_FLUSHING;
-    }
-
-    assert(GST_IS_BUFFER(buffer));
-    if (!gst_buffer_map(buffer, &stream->map_info, GST_MAP_READ))
-    {
-        pthread_mutex_unlock(&parser->mutex);
-        GST_ERROR("Failed to map buffer.\n");
-        return GST_FLOW_ERROR;
-    }
-
-    stream->event = *event;
-    stream->buffer = buffer;
-    pthread_mutex_unlock(&parser->mutex);
-    pthread_cond_signal(&stream->event_cond);
-    GST_LOG("Event queued.");
-    return GST_FLOW_OK;
-}
-
 static gboolean sink_event_cb(GstPad *pad, GstObject *parent, GstEvent *event)
 {
     struct wg_parser_stream *stream = gst_pad_get_element_private(pad);
@@ -550,8 +513,8 @@ static gboolean sink_event_cb(GstPad *pad, GstObject *parent, GstEvent *event)
 static GstFlowReturn sink_chain_cb(GstPad *pad, GstObject *parent, GstBuffer *buffer)
 {
     struct wg_parser_stream *stream = gst_pad_get_element_private(pad);
+    struct wg_parser *parser = stream->parser;
     struct wg_parser_event stream_event;
-    GstFlowReturn ret;
 
     GST_LOG("stream %p, buffer %p.", stream, buffer);
 
@@ -576,10 +539,41 @@ static GstFlowReturn sink_chain_cb(GstPad *pad, GstObject *parent, GstBuffer *bu
     stream_event.u.buffer.delta = GST_BUFFER_FLAG_IS_SET(buffer, GST_BUFFER_FLAG_DELTA_UNIT);
     stream_event.u.buffer.size = gst_buffer_get_size(buffer);
 
-    /* Transfer our reference to the buffer to the stream object. */
-    if ((ret = queue_stream_event(stream, &stream_event, buffer)) != GST_FLOW_OK)
+    /* Allow this buffer to be flushed by GStreamer. We are effectively
+     * implementing a queue object here. */
+
+    pthread_mutex_lock(&parser->mutex);
+
+    while (!stream->flushing && stream->event.type != WG_PARSER_EVENT_NONE)
+        pthread_cond_wait(&stream->event_empty_cond, &parser->mutex);
+    if (stream->flushing)
+    {
+        pthread_mutex_unlock(&parser->mutex);
+        GST_DEBUG("Stream is flushing; discarding buffer.");
         gst_buffer_unref(buffer);
-    return ret;
+        return GST_FLOW_FLUSHING;
+    }
+
+    if (!gst_buffer_map(buffer, &stream->map_info, GST_MAP_READ))
+    {
+        pthread_mutex_unlock(&parser->mutex);
+        GST_ERROR("Failed to map buffer.\n");
+        gst_buffer_unref(buffer);
+        return GST_FLOW_ERROR;
+    }
+
+    stream->event = stream_event;
+    stream->buffer = buffer;
+
+    pthread_mutex_unlock(&parser->mutex);
+    pthread_cond_signal(&stream->event_cond);
+
+    /* The chain callback is given a reference to the buffer. Transfer that
+     * reference to the stream object, which will release it in
+     * wg_parser_stream_release_buffer(). */
+
+    GST_LOG("Buffer queued.");
+    return GST_FLOW_OK;
 }
 
 static gboolean sink_query_cb(GstPad *pad, GstObject *parent, GstQuery *query)