glupload: make gl memory upload manner only consider memory:GLMemory feature

The current _gl_memory_upload_transform_caps() only simply apply
"memory:GLMemory" to all input caps to transform the output caps.
This is not precise and may cause problem. For example, if the
input caps include:

  video/x-raw(memory:DMABuf), width=(int)1920, height=(int)1080, \
  interlace-mode=(string)progressive, multiview-mode=(string)mono, \
  framerate=(fraction)30/1, drm-format=(string)NV12:0x0100000000000002

it will be changed as

  video/x-raw(memory:GLMemory), width=(int)1920, height=(int)1080, \
  interlace-mode=(string)progressive, multiview-mode=(string)mono, \
  framerate=(fraction)30/1, drm-format=(string)NV12:0x0100000000000002

For GLMemory kind caps, no drm-format should appear.

So we should let it only transforms which it can recognize.

And in _gl_memory_upload_propose_allocation(), we should only allocate
the allocator and buffer pool for the caps with "memory:GLMemory"
feature.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3524>

subprojects/gst-plugins-base/gst-libs/gst/gl/gstglupload.c

@@ -305,16 +305,24 @@ _gl_memory_upload_transform_caps (gpointer impl, GstGLContext * context,
       (GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION);
   GstCaps *ret;
 
-  ret =
-      _set_caps_features_with_passthrough (caps,
-      GST_CAPS_FEATURE_MEMORY_GL_MEMORY, passthrough);
-
-  gst_caps_features_free (passthrough);
-
   if (direction == GST_PAD_SINK) {
     GstCaps *tmp;
+    GstCapsFeatures *filter_features;
     GstGLTextureTarget target_mask;
 
+    filter_features = gst_caps_features_new (GST_CAPS_FEATURE_MEMORY_GL_MEMORY,
+        GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY, NULL);
+    if (!_filter_caps_with_features (caps, filter_features, &tmp)) {
+      gst_caps_features_free (filter_features);
+      gst_caps_features_free (passthrough);
+      return NULL;
+    }
+    gst_caps_features_free (filter_features);
+
+    ret = _set_caps_features_with_passthrough (tmp,
+        GST_CAPS_FEATURE_MEMORY_GL_MEMORY, passthrough);
+    gst_caps_unref (tmp);
+
     if (upload->input_target != GST_GL_TEXTURE_TARGET_NONE) {
       target_mask = 1 << upload->input_target;
     } else {
@@ -329,6 +337,9 @@ _gl_memory_upload_transform_caps (gpointer impl, GstGLContext * context,
   } else {
     gint i, n;
 
+    ret = _set_caps_features_with_passthrough (caps,
+        GST_CAPS_FEATURE_MEMORY_GL_MEMORY, passthrough);
+
     n = gst_caps_get_size (ret);
     for (i = 0; i < n; i++) {
       GstStructure *s = gst_caps_get_structure (ret, i);
@@ -337,6 +348,12 @@ _gl_memory_upload_transform_caps (gpointer impl, GstGLContext * context,
     }
   }
 
+  gst_caps_features_free (passthrough);
+
+  GST_DEBUG_OBJECT (upload->upload, "direction %s, transformed %"
+      GST_PTR_FORMAT " into %" GST_PTR_FORMAT,
+      direction == GST_PAD_SRC ? "src" : "sink", caps, ret);
+
   return ret;
 }
 
@@ -390,16 +407,24 @@ _gl_memory_upload_propose_allocation (gpointer impl, GstQuery * decide_query,
   guint n_pools, i;
   GstCaps *caps;
   GstCapsFeatures *features;
+  GstAllocator *allocator;
+  GstAllocationParams params;
 
   gst_query_parse_allocation (query, &caps, NULL);
   if (caps == NULL)
     goto invalid_caps;
-  features = gst_caps_get_features (caps, 0);
 
+  g_assert (gst_caps_is_fixed (caps));
+
+  features = gst_caps_features_new (GST_CAPS_FEATURE_MEMORY_GL_MEMORY,
+      GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY, NULL);
   /* Only offer our custom allocator if that type of memory was negotiated. */
-  if (gst_caps_features_contains (features, GST_CAPS_FEATURE_MEMORY_GL_MEMORY)) {
+  if (!_filter_caps_with_features (caps, features, NULL)) {
-    GstAllocator *allocator;
+    gst_caps_features_free (features);
-    GstAllocationParams params;
+    return;
+  }
+  gst_caps_features_free (features);
+
   gst_allocation_params_init (&params);
 
   allocator =
@@ -418,7 +443,6 @@ _gl_memory_upload_propose_allocation (gpointer impl, GstQuery * decide_query,
     gst_object_unref (allocator);
   }
 #endif
-  }
 
   n_pools = gst_query_get_n_allocation_pools (query);
   for (i = 0; i < n_pools; i++) {