[Bug 788918] vaapi: supports hierarchical prediction encoding

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788918

--- Comment #26 from Hyunjun Ko <zzoon at igalia.com> ---
(In reply to sreerenj from comment #18)
> Hyunjun, thanks for bringing these patches to Bugzilla!
> 
> 
> BTW please make sure the low-power encoding is disabled in Hierarchical-B
> (B-frames are not supported by the intel driver in VDENC/low-power).
> 

Sure. It disables Hierarchical-B if it's low power encoding mode here.

@@ -2695,6 +2778,10 @@ reset_properties (GstVaapiEncoderH264 * encoder)
   if (base_encoder->max_num_ref_frames_1 < 1 && encoder->num_bframes > 0) {
     GST_WARNING ("Disabling b-frame since the driver doesn't support it");
     encoder->num_bframes = 0;
+
+    if (encoder->prediction_type ==
+        GST_VAAPI_ENCODER_H264_PREDICTION_HIERARCHICAL_B)
+      encoder->prediction_type = GST_VAAPI_ENCODER_H264_PREDICTION_DEFAULT;
   }

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