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qmlglsrc: sync on the streaming thread

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After rendering a QML scene the qmlglsrc element copies the contents of
the scene to a GStreamer buffer. This happens on the Qt render thread.
Then it attaches a sync point to the destination buffer. This sync point
must be awaited by other threads which use the buffer later on. The
current implementation relies on the downstream elements to wait for the
sync point. However, there are situation where this does not work. The
GstBaseTransform e.g. copies the buffer metadata (which overwrites the
sync point without waiting for it) *before* waiting for the sync point.

This commit waits for the sync point inside the qmlglsrc element before
sending it downstream. The wait command is issued on the streaming
thread with the pipeline OpenGL context, i.e. it will synchronize with
the GStreamer OpenGL thread.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5515>
This commit is contained in:
Matthias Fuchs 2023-10-17 15:24:22 +02:00 committed by GStreamer Marge Bot
parent 61c62919a7
commit 7c49ce1c21
1 changed files with 6 additions and 0 deletions
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6
subprojects/gst-plugins-good/ext/qt/gstqtsrc.cc
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@ -434,6 +434,8 @@ static GstFlowReturn
gst_qt_src_fill (GstPushSrc * psrc, GstBuffer * buffer)
{
GstQtSrc *qt_src = GST_QT_SRC (psrc);
GstGLContext* context = qt_src->context;
GstGLSyncMeta *sync_meta;
GST_DEBUG_OBJECT (qt_src, "setting buffer %p", buffer);
@ -442,6 +444,10 @@ gst_qt_src_fill (GstPushSrc * psrc, GstBuffer * buffer)
return GST_FLOW_ERROR;
}
sync_meta = gst_buffer_get_gl_sync_meta(buffer);
if (sync_meta)
gst_gl_sync_meta_wait(sync_meta, context);
if (!qt_src->downstream_supports_affine_meta) {
if (qt_src->pending_image_orientation) {
/* let downstream know the image orientation is vertical filp */