glupload: add GST_CAPS_FEATURE_MEMORY_DMABUF

Insert before SystemMemory to advice upstream elements that it is
preferable for them to push dmabuf with the caps feature.

Examples:

/* Discard memory:DMABuf caps feature */
GST_GL_PLATFORM=egl GST_GL_API=gles2 GST_GL_WINDOW=x11 gst-launch-1.0 \
    filesrc location=test.mp4 ! qtdemux ! h264parse ! vaapih264dec ! \
    capsfilter caps="video/x-raw(memory:SystemMemory)" ! glimagesink

/* Force memory:DMABuf caps feature. */
GST_GL_PLATFORM=egl GST_GL_API=gles2 GST_GL_WINDOW=x11 gst-launch-1.0 \
    filesrc location=test.mp4 ! qtdemux ! h264parse ! vaapih264dec ! \
    capsfilter caps="video/x-raw(memory:DMABuf)" ! glimagesink

/* Auto select memory:DMABuf caps feature.  */
GST_GL_PLATFORM=egl GST_GL_API=gles2 GST_GL_WINDOW=x11 gst-launch-1.0 \
    filesrc location=test.mp4 ! qtdemux ! h264parse ! vaapih264dec ! \
    glimagesink

https://bugzilla.gnome.org/show_bug.cgi?id=774649

diff --git a/gst-libs/gst/gl/gstglupload.c b/gst-libs/gst/gl/gstglupload.c
index 7bc1b6d835e8aab6e851900aafcc7b709a8f4a18..ddfeaf3222e89c58c569968ba1a7e2f71eaba246 100644 (file)
--- a/gst-libs/gst/gl/gstglupload.c
+++ b/gst-libs/gst/gl/gstglupload.c
@@ -488,7 +488,10 @@ struct DmabufUpload
 };
 
 static GstStaticCaps _dma_buf_upload_caps =
-GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (GST_GL_MEMORY_VIDEO_FORMATS_STR));
+    GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE_WITH_FEATURES
+    (GST_CAPS_FEATURE_MEMORY_DMABUF,
+        GST_GL_MEMORY_VIDEO_FORMATS_STR) ";"
+    GST_VIDEO_CAPS_MAKE (GST_GL_MEMORY_VIDEO_FORMATS_STR));
 
 static gpointer
 _dma_buf_upload_new (GstGLUpload * upload)
@@ -522,7 +525,7 @@ _dma_buf_upload_transform_caps (gpointer impl, GstGLContext * context,
 
     ret =
         _set_caps_features_with_passthrough (caps,
-        GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY, passthrough);
+        GST_CAPS_FEATURE_MEMORY_DMABUF, passthrough);
 
     n = gst_caps_get_size (ret);
     for (i = 0; i < n; i++) {