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-rw-r--r--cogl-gst/cogl-gst-video-sink.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/cogl-gst/cogl-gst-video-sink.h b/cogl-gst/cogl-gst-video-sink.h
index 87e79539..3c11be75 100644
--- a/cogl-gst/cogl-gst-video-sink.h
+++ b/cogl-gst/cogl-gst-video-sink.h
@@ -78,7 +78,9 @@
* called cogl_gst_sample_video0 which takes a single vec2 argument.
* This can be used by custom snippets set the by the application to
* sample from the video. The vec2 argument represents the normalised
- * coordinates within the video.
+ * coordinates within the video. The function returns a vec4
+ * containing a pre-multiplied RGBA color of the pixel within the
+ * video.
*
* Since: 1.16
*/