qvideosurfacegstsink: fixed calculation of supported formats.

If the custom buffer pool is used, it's also necessary
to query the list of video surface formats with this handle type.

Change-Id: I8a38f4c75f37ed05fbfdcf0933023a6abef1b3e1
Reviewed-by: Mithra Pattison <mithra.pattison@nokia.com>
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>
Reviewed-by: Jonas Rabbe <jonas.rabbe@gmail.com>

src/gsttools/qvideosurfacegstsink.cpp

@@ -523,7 +523,24 @@ GstCaps *QVideoSurfaceGstSink::get_caps(GstBaseSink *base)
 
     GstCaps *caps = gst_caps_new_empty();
 
+    // Find the supported pixel formats
+    // with buffer pool specific formats listed first
+    QList<QVideoFrame::PixelFormat> supportedFormats;
+
+    QList<QVideoFrame::PixelFormat> poolHandleFormats;
+    sink->delegate->poolMutex()->lock();
+    QGstBufferPoolInterface *pool = sink->delegate->pool();
+    if (pool)
+        poolHandleFormats = sink->delegate->supportedPixelFormats(pool->handleType());
+    sink->delegate->poolMutex()->unlock();
+
+    supportedFormats = poolHandleFormats;
     foreach (QVideoFrame::PixelFormat format, sink->delegate->supportedPixelFormats()) {
+        if (!poolHandleFormats.contains(format))
+            supportedFormats.append(format);
+    }
+
+    foreach (QVideoFrame::PixelFormat format, supportedFormats) {
         int index = indexOfYuvColor(format);
 
         if (index != -1) {
@@ -750,6 +767,8 @@ GstFlowReturn QVideoSurfaceGstSink::buffer_alloc(
         return GST_FLOW_OK;
     }
 
+    poolLock.unlock();
+
     GstCaps *intersection = gst_caps_intersect(get_caps(GST_BASE_SINK(sink)), caps);
 
     if (gst_caps_is_empty (intersection)) {
@@ -757,8 +776,6 @@ GstFlowReturn QVideoSurfaceGstSink::buffer_alloc(
         return GST_FLOW_NOT_NEGOTIATED;
     }
 
-    poolLock.unlock();
-
     if (sink->delegate->isActive()) {
         //if format was changed, restart the surface
         QVideoSurfaceFormat format = formatForCaps(intersection);