v4l2codecs: vp8: Allow baseclass from skipping frames

In preparation for !1670, this will allow the base class from skipping frames
that should not be displayed. Previously it would complain about unordered
decoding taking place in the driver.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1701>

1 files changed, 7 insertions, 11 deletions

diff --git a/sys/v4l2codecs/gstv4l2codecvp8dec.c b/sys/v4l2codecs/gstv4l2codecvp8dec.c
index f142d56d6..0e5024c01 100644
--- a/sys/v4l2codecs/gstv4l2codecvp8dec.c
+++ b/sys/v4l2codecs/gstv4l2codecvp8dec.c
@@ -682,17 +682,13 @@ gst_v4l2_codec_vp8_dec_output_picture (GstVp8Decoder * decoder,
     goto error;
   }
 
-  if (!gst_v4l2_decoder_dequeue_src (self->decoder, &frame_num)) {
-    GST_ELEMENT_ERROR (self, STREAM, DECODE,
-        ("Decoder did not produce a frame"), (NULL));
-    goto error;
-  }
-
-  if (frame_num != picture->system_frame_number) {
-    GST_ELEMENT_ERROR (self, STREAM, DECODE,
-        ("Decoder produced out of order frame"), (NULL));
-    goto error;
-  }
+  do {
+    if (!gst_v4l2_decoder_dequeue_src (self->decoder, &frame_num)) {
+      GST_ELEMENT_ERROR (self, STREAM, DECODE,
+          ("Decoder did not produce a frame"), (NULL));
+      goto error;
+    }
+  } while (frame_num != picture->system_frame_number);
 
 finish_frame:
   gst_v4l2_request_set_done (request);