vaapidecode: simplify bufferpool configuration.

Rework the logics behind the configuration of an adequate bufferpool,
especially when OpenGL meta or additional capsfeatures are needed.

Besides, for GStreamer >= 1.4, the first capsfeatures that gets matched,
and that is not system memory, is now selected by default.

gst/vaapi/gstvaapidecode.c

@@ -517,11 +517,10 @@ gst_vaapidecode_decide_allocation(GstVideoDecoder *vdec, GstQuery *query)
     gboolean need_pool, update_pool;
     gboolean has_video_meta = FALSE;
     gboolean has_video_alignment = FALSE;
-    GstVideoCodecState *state;
 #if GST_CHECK_VERSION(1,1,0) && USE_GLX
     gboolean has_texture_upload_meta = FALSE;
-    GstCapsFeatures *features, *features2;
 #endif
+    GstVideoCodecState *state;
 
     gst_query_parse_allocation(query, &caps, &need_pool);
 
@@ -531,34 +530,27 @@ gst_vaapidecode_decide_allocation(GstVideoDecoder *vdec, GstQuery *query)
     state = gst_video_decoder_get_output_state(vdec);
 
     decode->has_texture_upload_meta = FALSE;
-    has_video_meta = gst_query_find_allocation_meta(query, GST_VIDEO_META_API_TYPE, NULL);
+    has_video_meta = gst_query_find_allocation_meta(query,
+        GST_VIDEO_META_API_TYPE, NULL);
+
 #if GST_CHECK_VERSION(1,1,0) && USE_GLX
-    if (has_video_meta)
+    has_texture_upload_meta = gst_query_find_allocation_meta(query,
-        decode->has_texture_upload_meta = gst_query_find_allocation_meta(query,
+        GST_VIDEO_GL_TEXTURE_UPLOAD_META_API_TYPE, NULL);
-            GST_VIDEO_GL_TEXTURE_UPLOAD_META_API_TYPE, NULL);
 
-    features = gst_caps_get_features(state->caps, 0);
+    decode->has_texture_upload_meta =
-    features2 = gst_caps_features_new(GST_CAPS_FEATURE_META_GST_VIDEO_GL_TEXTURE_UPLOAD_META, NULL);
-
-    has_texture_upload_meta =
         gst_vaapi_find_preferred_caps_feature(GST_VIDEO_DECODER_SRC_PAD(vdec),
             GST_VIDEO_FORMAT_ENCODED) ==
         GST_VAAPI_CAPS_FEATURE_GL_TEXTURE_UPLOAD_META;
-
-    /* Update src caps if feature is not handled downstream */
-    if (!decode->has_texture_upload_meta &&
-        gst_caps_features_is_equal(features, features2))
-        gst_vaapidecode_update_src_caps (decode, state);
-    else if (has_texture_upload_meta &&
-             !gst_caps_features_is_equal(features, features2)) {
-        gst_video_info_set_format(&state->info, GST_VIDEO_FORMAT_RGBA,
-                                  state->info.width,
-                                  state->info.height);
-        gst_vaapidecode_update_src_caps(decode, state);
-    }
-    gst_caps_features_free(features2);
 #endif
 
+    /* Update src caps if feature is not handled downstream */
+    if (!gst_caps_is_always_compatible(caps, state->caps)) {
+        if (decode->has_texture_upload_meta)
+            gst_video_info_set_format(&state->info, GST_VIDEO_FORMAT_RGBA,
+                GST_VIDEO_INFO_WIDTH(&state->info),
+                GST_VIDEO_INFO_HEIGHT(&state->info));
+        gst_vaapidecode_update_src_caps(decode, state);
+    }
     gst_video_codec_state_unref(state);
 
     gst_video_info_init(&vi);
@@ -609,7 +601,7 @@ gst_vaapidecode_decide_allocation(GstVideoDecoder *vdec, GstQuery *query)
         gst_buffer_pool_config_add_option(config,
             GST_BUFFER_POOL_OPTION_VIDEO_META);
 #if GST_CHECK_VERSION(1,1,0) && USE_GLX
-        if (decode->has_texture_upload_meta)
+        if (has_texture_upload_meta)
             gst_buffer_pool_config_add_option(config,
                 GST_BUFFER_POOL_OPTION_VIDEO_GL_TEXTURE_UPLOAD_META);
 #endif
@@ -622,6 +614,15 @@ gst_vaapidecode_decide_allocation(GstVideoDecoder *vdec, GstQuery *query)
         gst_buffer_pool_set_config(pool, config);
     }
 
+#if GST_CHECK_VERSION(1,1,0) && USE_GLX
+    if (decode->has_texture_upload_meta && !has_texture_upload_meta) {
+        config = gst_buffer_pool_get_config(pool);
+        gst_buffer_pool_config_add_option(config,
+            GST_BUFFER_POOL_OPTION_VIDEO_GL_TEXTURE_UPLOAD_META);
+        gst_buffer_pool_set_config(pool, config);
+    }
+#endif
+
     if (update_pool)
         gst_query_set_nth_allocation_pool(query, 0, pool, size, min, max);
     else

gst/vaapi/gstvaapipluginutil.c

@@ -541,6 +541,12 @@ gst_vaapi_find_preferred_caps_feature (GstPad * pad, GstVideoFormat format)
     GstCapsFeatures *const features = gst_caps_get_features (out_caps, i);
     GstStructure *const structure = gst_caps_get_structure (out_caps, i);
 
+#if GST_CHECK_VERSION(1,3,0)
+    /* Skip ANY features, we need an exact match for correct evaluation */
+    if (gst_caps_features_is_any (features))
+      continue;
+#endif
+
     caps = gst_caps_new_full (gst_structure_copy (structure), NULL);
     if (!caps)
       continue;
@@ -556,6 +562,13 @@ gst_vaapi_find_preferred_caps_feature (GstPad * pad, GstVideoFormat format)
         feature < GST_VAAPI_CAPS_FEATURE_SYSTEM_MEMORY)
       feature = GST_VAAPI_CAPS_FEATURE_SYSTEM_MEMORY;
     gst_caps_replace (&caps, NULL);
+
+#if GST_CHECK_VERSION(1,3,0)
+    /* Stop at the first match, the caps should already be sorted out
+       by preference order from downstream elements */
+    if (feature != GST_VAAPI_CAPS_FEATURE_SYSTEM_MEMORY)
+      break;
+#endif
   }
 
 cleanup: