rtphdrext: Put simple caps generation as the base class default

Instead of having a helper function that gets called by almost every
subclass, just let the base class set the caps fields automatically.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/906>

subprojects/gst-plugins-base/gst-libs/gst/rtp/gstrtphdrext.c

@@ -399,21 +399,55 @@ gst_rtp_header_extension_set_attributes_from_caps (GstRTPHeaderExtension * ext,
   GstRTPHeaderExtensionClass *klass;
   GstStructure *structure;
   gchar *field_name;
+  const GValue *val;
 
   g_return_val_if_fail (GST_IS_CAPS (caps), FALSE);
   g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE);
   g_return_val_if_fail (GST_IS_RTP_HEADER_EXTENSION (ext), FALSE);
   g_return_val_if_fail (priv->ext_id <= MAX_RTP_EXT_ID, FALSE);
   klass = GST_RTP_HEADER_EXTENSION_GET_CLASS (ext);
-  g_return_val_if_fail (klass->set_attributes_from_caps != NULL, FALSE);
 
   structure = gst_caps_get_structure (caps, 0);
   g_return_val_if_fail (structure != NULL, FALSE);
   field_name = g_strdup_printf ("extmap-%u", priv->ext_id);
   g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
+
+  val = gst_structure_get_value (structure, field_name);
   g_free (field_name);
 
-  return klass->set_attributes_from_caps (ext, caps);
+  if (G_VALUE_HOLDS_STRING (val)) {
+    const gchar *ext_uri = g_value_get_string (val);
+
+    if (g_strcmp0 (ext_uri, gst_rtp_header_extension_get_uri (ext)) != 0) {
+      /* incompatible extension uri for this instance */
+      goto error;
+    }
+  } else if (GST_VALUE_HOLDS_ARRAY (val)
+      && gst_value_array_get_size (val) == 3) {
+    const GValue *inner_val;
+
+    inner_val = gst_value_array_get_value (val, 1);
+    if (!G_VALUE_HOLDS_STRING (inner_val))
+      goto error;
+    if (g_strcmp0 (g_value_get_string (inner_val),
+            gst_rtp_header_extension_get_uri (ext)) != 0)
+      goto error;
+
+    inner_val = gst_value_array_get_value (val, 2);
+    if (!G_VALUE_HOLDS_STRING (inner_val))
+      goto error;
+  } else {
+    /* unknown caps format */
+    goto error;
+  }
+
+  if (klass->set_attributes_from_caps)
+    return klass->set_attributes_from_caps (ext, caps);
+  else
+    return TRUE;
+
+error:
+  return FALSE;
 }
 
 /**
@@ -586,42 +620,6 @@ gst_rtp_header_extension_get_sdp_caps_field_name (GstRTPHeaderExtension * ext)
   return g_strdup_printf ("extmap-%u", priv->ext_id);
 }
 
-/**
- * gst_rtp_header_extension_set_attributes_from_caps_simple_sdp:
- * @ext: the #GstRTPHeaderExtension
- * @caps: #GstCaps to read attributes from
- *
- * Helper implementation for GstRTPExtensionClass::set_attributes_from_caps
- * that retrieves the configured extension id and checks that the
- * corresponding field in the sdp caps is configured for this extension uri.
- * Requires that the extension does not have any attributes or direction
- * advertised in the caps.
- *
- * Returns: whether the attributes in the @caps could be set on @ext successfully
- *
- * Since: 1.20
- */
-gboolean
-    gst_rtp_header_extension_set_attributes_from_caps_simple_sdp
-    (GstRTPHeaderExtension * ext, const GstCaps * caps) {
-  gchar *field_name = gst_rtp_header_extension_get_sdp_caps_field_name (ext);
-  GstStructure *s = gst_caps_get_structure (caps, 0);
-  const gchar *ext_uri;
-
-  if (!(ext_uri = gst_structure_get_string (s, field_name)))
-    goto error;
-
-  if (g_strcmp0 (ext_uri, gst_rtp_header_extension_get_uri (ext)) != 0)
-    goto error;
-
-  g_free (field_name);
-  return TRUE;
-
-error:
-  g_free (field_name);
-  return FALSE;
-}
-
 /**
  * gst_rtp_header_extension_set_caps_from_attributes_simple_sdp:
  * @ext: the #GstRTPHeaderExtension

subprojects/gst-plugins-base/gst-libs/gst/rtp/gstrtphdrext.h

@@ -248,8 +248,6 @@ GstRTPHeaderExtension * gst_rtp_header_extension_create_from_uri (const gchar *
 GST_RTP_API
 gchar *	            gst_rtp_header_extension_get_sdp_caps_field_name (GstRTPHeaderExtension * ext);
 GST_RTP_API
-gboolean           gst_rtp_header_extension_set_attributes_from_caps_simple_sdp (GstRTPHeaderExtension * ext, const GstCaps *caps);
-GST_RTP_API
 gboolean           gst_rtp_header_extension_set_caps_from_attributes_simple_sdp (GstRTPHeaderExtension * ext, GstCaps *caps);
 
 G_END_DECLS

subprojects/gst-plugins-good/gst/rtp/gstrtphdrext-colorspace.c

@@ -451,8 +451,6 @@ static void
       gst_rtp_header_extension_colorspace_set_non_rtp_sink_caps;
   rtp_hdr_class->update_non_rtp_src_caps =
       gst_rtp_header_extension_colorspace_update_non_rtp_src_caps;
-  rtp_hdr_class->set_attributes_from_caps =
-      gst_rtp_header_extension_set_attributes_from_caps_simple_sdp;
   rtp_hdr_class->set_caps_from_attributes =
       gst_rtp_header_extension_set_caps_from_attributes_simple_sdp;
 

subprojects/gst-plugins-good/gst/rtpmanager/gstrtphdrext-rfc6464.c

@@ -119,36 +119,14 @@ gst_rtp_header_extension_rfc6464_set_attributes_from_caps (GstRTPHeaderExtension
 {
   gchar *field_name = gst_rtp_header_extension_get_sdp_caps_field_name (ext);
   GstStructure *s = gst_caps_get_structure (caps, 0);
-  const gchar *ext_uri;
   const GValue *arr;
 
-  if (!field_name)
+  arr = gst_structure_get_value (s, field_name);
-    return FALSE;
+  g_free (field_name);
 
-  if ((ext_uri = gst_structure_get_string (s, field_name))) {
+  if (GST_VALUE_HOLDS_ARRAY (arr)) {
-    if (g_strcmp0 (ext_uri, gst_rtp_header_extension_get_uri (ext)) != 0) {
+    const GValue *val = gst_value_array_get_value (arr, 2);
-      /* incompatible extension uri for this instance */
+    const gchar *vad_attr = g_value_get_string (val);
-      goto error;
-    }
-    set_vad (ext, DEFAULT_VAD);
-  } else if ((arr = gst_structure_get_value (s, field_name))
-      && GST_VALUE_HOLDS_ARRAY (arr)
-      && gst_value_array_get_size (arr) == 3) {
-    const GValue *val;
-    const gchar *vad_attr;
-
-    val = gst_value_array_get_value (arr, 1);
-    if (!G_VALUE_HOLDS_STRING (val))
-      goto error;
-    if (g_strcmp0 (g_value_get_string (val),
-            gst_rtp_header_extension_get_uri (ext)) != 0)
-      goto error;
-
-    val = gst_value_array_get_value (arr, 2);
-    if (!G_VALUE_HOLDS_STRING (val))
-      goto error;
-
-    vad_attr = g_value_get_string (val);
 
     if (g_str_equal (vad_attr, "vad=on"))
       set_vad (ext, TRUE);
@@ -156,19 +134,11 @@ gst_rtp_header_extension_rfc6464_set_attributes_from_caps (GstRTPHeaderExtension
       set_vad (ext, FALSE);
     else {
       GST_WARNING_OBJECT (ext, "Invalid attribute: %s", vad_attr);
-      goto error;
+      return FALSE;
     }
-  } else {
-    /* unknown caps format */
-    goto error;
   }
 
-  g_free (field_name);
   return TRUE;
-
-error:
-  g_free (field_name);
-  return FALSE;
 }
 
 static gboolean

subprojects/gst-plugins-good/gst/rtpmanager/gstrtphdrext-twcc.c

@@ -104,8 +104,6 @@ gst_rtp_header_extension_twcc_class_init (GstRTPHeaderExtensionTWCCClass *
   rtp_hdr_class->get_max_size = gst_rtp_header_extension_twcc_get_max_size;
   rtp_hdr_class->write = gst_rtp_header_extension_twcc_write;
   rtp_hdr_class->read = gst_rtp_header_extension_twcc_read;
-  rtp_hdr_class->set_attributes_from_caps =
-      gst_rtp_header_extension_set_attributes_from_caps_simple_sdp;
   rtp_hdr_class->set_caps_from_attributes =
       gst_rtp_header_extension_set_caps_from_attributes_simple_sdp;