basevideo: Make GstVideoFrame a reference counted boxed object

...and also clear all existing frames when resetting the decoder or encoder.

omx/gstbasevideocodec.c

@@ -45,6 +45,9 @@ static void gst_base_video_codec_finalize (GObject * object);
 static GstStateChangeReturn gst_base_video_codec_change_state (GstElement *
     element, GstStateChange transition);
 
+G_DEFINE_BOXED_TYPE (GstVideoState, gst_video_frame,
+    (GBoxedCopyFunc) gst_video_frame_ref,
+    (GBoxedFreeFunc) gst_video_frame_unref);
 
 GST_BOILERPLATE (GstBaseVideoCodec, gst_base_video_codec, GstElement,
     GST_TYPE_ELEMENT);
@@ -109,7 +112,7 @@ gst_base_video_codec_reset (GstBaseVideoCodec * base_video_codec)
 
   GST_BASE_VIDEO_CODEC_STREAM_LOCK (base_video_codec);
   for (g = base_video_codec->frames; g; g = g_list_next (g)) {
-    gst_base_video_codec_free_frame ((GstVideoFrame *) g->data);
+    gst_video_frame_unref ((GstVideoFrame *) g->data);
   }
   g_list_free (base_video_codec->frames);
   base_video_codec->frames = NULL;
@@ -175,16 +178,21 @@ gst_base_video_codec_new_frame (GstBaseVideoCodec * base_video_codec)
 
   frame = g_slice_new0 (GstVideoFrame);
 
+  frame->ref_count = 1;
+
   GST_BASE_VIDEO_CODEC_STREAM_LOCK (base_video_codec);
   frame->system_frame_number = base_video_codec->system_frame_number;
   base_video_codec->system_frame_number++;
   GST_BASE_VIDEO_CODEC_STREAM_UNLOCK (base_video_codec);
 
+  GST_LOG_OBJECT (base_video_codec, "Created new frame %p (sfn:%d)",
+      frame, frame->system_frame_number);
+
   return frame;
 }
 
-void
-gst_base_video_codec_free_frame (GstVideoFrame * frame)
+static void
+_gst_video_frame_free (GstVideoFrame * frame)
 {
   g_return_if_fail (frame != NULL);
 
@@ -204,3 +212,24 @@ gst_base_video_codec_free_frame (GstVideoFrame * frame)
 
   g_slice_free (GstVideoFrame, frame);
 }
+
+GstVideoFrame *
+gst_video_frame_ref (GstVideoFrame * frame)
+{
+  g_return_val_if_fail (frame != NULL, NULL);
+
+  g_atomic_int_inc (&frame->ref_count);
+
+  return frame;
+}
+
+void
+gst_video_frame_unref (GstVideoFrame * frame)
+{
+  g_return_if_fail (frame != NULL);
+  g_return_if_fail (frame->ref_count > 0);
+
+  if (g_atomic_int_dec_and_test (&frame->ref_count)) {
+    _gst_video_frame_free (frame);
+  }
+}

omx/gstbasevideocodec.h

@@ -110,6 +110,8 @@ struct _GstVideoState
 
 struct _GstVideoFrame
 {
+  gint ref_count;
+
   GstClockTime decode_timestamp;
   GstClockTime presentation_timestamp;
   GstClockTime presentation_duration;
@@ -179,10 +181,13 @@ struct _GstBaseVideoCodecClass
   void *padding[GST_PADDING_LARGE];
 };
 
+GType gst_video_frame_get_type (void);
 GType gst_base_video_codec_get_type (void);
 
 GstVideoFrame * gst_base_video_codec_new_frame (GstBaseVideoCodec *base_video_codec);
-void gst_base_video_codec_free_frame (GstVideoFrame *frame);
+
+GstVideoFrame * gst_video_frame_ref (GstVideoFrame * frame);
+void            gst_video_frame_unref (GstVideoFrame * frame);
 
 G_END_DECLS
 

omx/gstbasevideodecoder.c

@@ -922,16 +922,19 @@ gst_base_video_decoder_clear_queues (GstBaseVideoDecoder * dec)
   g_list_foreach (dec->gather, (GFunc) gst_mini_object_unref, NULL);
   g_list_free (dec->gather);
   dec->gather = NULL;
-  g_list_foreach (dec->decode, (GFunc) gst_base_video_codec_free_frame, NULL);
+  g_list_foreach (dec->decode, (GFunc) gst_video_frame_unref, NULL);
   g_list_free (dec->decode);
   dec->decode = NULL;
   g_list_foreach (dec->parse, (GFunc) gst_mini_object_unref, NULL);
   g_list_free (dec->parse);
   dec->parse = NULL;
-  g_list_foreach (dec->parse_gather, (GFunc) gst_base_video_codec_free_frame,
-      NULL);
+  g_list_foreach (dec->parse_gather, (GFunc) gst_video_frame_unref, NULL);
   g_list_free (dec->parse_gather);
   dec->parse_gather = NULL;
+  g_list_foreach (GST_BASE_VIDEO_CODEC (dec)->frames,
+      (GFunc) gst_video_frame_unref, NULL);
+  g_list_free (GST_BASE_VIDEO_CODEC (dec)->frames);
+  GST_BASE_VIDEO_CODEC (dec)->frames = NULL;
 }
 
 static void
@@ -965,7 +968,7 @@ gst_base_video_decoder_reset (GstBaseVideoDecoder * base_video_decoder,
   base_video_decoder->timestamps = NULL;
 
   if (base_video_decoder->current_frame) {
-    gst_base_video_codec_free_frame (base_video_decoder->current_frame);
+    gst_video_frame_unref (base_video_decoder->current_frame);
     base_video_decoder->current_frame = NULL;
   }
 
@@ -1094,8 +1097,10 @@ gst_base_video_decoder_flush_decode (GstBaseVideoDecoder * dec)
 
     next = g_list_next (walk);
     if (dec->current_frame)
-      gst_base_video_codec_free_frame (dec->current_frame);
+      gst_video_frame_unref (dec->current_frame);
     dec->current_frame = frame;
+    gst_video_frame_ref (dec->current_frame);
+
     /* decode buffer, resulting data prepended to queue */
     res = gst_base_video_decoder_have_frame_2 (dec);
 
@@ -1471,10 +1476,7 @@ gst_base_video_decoder_do_finish_frame (GstBaseVideoDecoder * dec,
   GST_BASE_VIDEO_CODEC (dec)->frames =
       g_list_remove (GST_BASE_VIDEO_CODEC (dec)->frames, frame);
 
-  if (frame->src_buffer)
-    gst_buffer_unref (frame->src_buffer);
-
-  gst_base_video_codec_free_frame (frame);
+  gst_video_frame_unref (frame);
 }
 
 /**
@@ -1861,6 +1863,9 @@ gst_base_video_decoder_have_frame_2 (GstBaseVideoDecoder * base_video_decoder)
   }
 
 exit:
+  /* current frame has either been added to parse_gather or sent to
+     handle frame so there is no need to unref it */
+
   /* create new frame */
   base_video_decoder->current_frame =
       gst_base_video_decoder_new_frame (base_video_decoder);

omx/gstbasevideoencoder.c

@@ -292,14 +292,9 @@ gst_base_video_encoder_drain (GstBaseVideoEncoder * enc)
   /* everything should be away now */
   if (codec->frames) {
     /* not fatal/impossible though if subclass/codec eats stuff */
-    GST_WARNING_OBJECT (enc, "still %d frames left after draining",
-        g_list_length (codec->frames));
-#if 0
-    /* FIXME should do this, but subclass may come up with it later on ?
-     * and would then need refcounting or so on frames */
-    g_list_foreach (codec->frames,
-        (GFunc) gst_base_video_codec_free_frame, NULL);
-#endif
+    g_list_foreach (codec->frames, (GFunc) gst_video_frame_unref, NULL);
+    g_list_free (codec->frames);
+    codec->frames = NULL;
   }
 
   return ret;
@@ -1121,7 +1116,7 @@ done:
   GST_BASE_VIDEO_CODEC (base_video_encoder)->frames =
       g_list_remove (GST_BASE_VIDEO_CODEC (base_video_encoder)->frames, frame);
 
-  gst_base_video_codec_free_frame (frame);
+  gst_video_frame_unref (frame);
 
   GST_BASE_VIDEO_CODEC_STREAM_UNLOCK (base_video_encoder);