omx: Add pads based on element type

This allows to later add sources and sink that only have a srcpad
or sinkpad.

https://bugzilla.gnome.org/show_bug.cgi?id=699754

omx/gstomx.c

@@ -2616,52 +2616,57 @@ _class_init (gpointer g_class, gpointer data)
 
   /* Add pad templates */
   err = NULL;
-  if (!(template_caps =
+  if (class_data->type != GST_OMX_COMPONENT_TYPE_SOURCE) {
-          g_key_file_get_string (config, element_name, "sink-template-caps",
+    if (!(template_caps =
-              &err))) {
+            g_key_file_get_string (config, element_name, "sink-template-caps",
-    GST_DEBUG
+                &err))) {
-        ("No sink template caps specified for element '%s', using default '%s'",
-        element_name, class_data->default_sink_template_caps);
-    caps = gst_caps_from_string (class_data->default_sink_template_caps);
-    g_assert (caps != NULL);
-    g_error_free (err);
-  } else {
-    caps = gst_caps_from_string (template_caps);
-    if (!caps) {
       GST_DEBUG
-          ("Could not parse sink template caps '%s' for element '%s', using default '%s'",
+          ("No sink template caps specified for element '%s', using default '%s'",
-          template_caps, element_name, class_data->default_sink_template_caps);
+          element_name, class_data->default_sink_template_caps);
       caps = gst_caps_from_string (class_data->default_sink_template_caps);
       g_assert (caps != NULL);
+      g_error_free (err);
+    } else {
+      caps = gst_caps_from_string (template_caps);
+      if (!caps) {
+        GST_DEBUG
+            ("Could not parse sink template caps '%s' for element '%s', using default '%s'",
+            template_caps, element_name,
+            class_data->default_sink_template_caps);
+        caps = gst_caps_from_string (class_data->default_sink_template_caps);
+        g_assert (caps != NULL);
+      }
     }
+    templ = gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, caps);
+    g_free (template_caps);
+    gst_element_class_add_pad_template (element_class, templ);
   }
-  templ = gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, caps);
-  g_free (template_caps);
-  gst_element_class_add_pad_template (element_class, templ);
 
   err = NULL;
-  if (!(template_caps =
+  if (class_data->type != GST_OMX_COMPONENT_TYPE_SINK) {
-          g_key_file_get_string (config, element_name, "src-template-caps",
+    if (!(template_caps =
-              &err))) {
+            g_key_file_get_string (config, element_name, "src-template-caps",
-    GST_DEBUG
+                &err))) {
-        ("No src template caps specified for element '%s', using default '%s'",
-        element_name, class_data->default_src_template_caps);
-    caps = gst_caps_from_string (class_data->default_src_template_caps);
-    g_assert (caps != NULL);
-    g_error_free (err);
-  } else {
-    caps = gst_caps_from_string (template_caps);
-    if (!caps) {
       GST_DEBUG
-          ("Could not parse src template caps '%s' for element '%s', using default '%s'",
+          ("No src template caps specified for element '%s', using default '%s'",
-          template_caps, element_name, class_data->default_src_template_caps);
+          element_name, class_data->default_src_template_caps);
       caps = gst_caps_from_string (class_data->default_src_template_caps);
       g_assert (caps != NULL);
+      g_error_free (err);
+    } else {
+      caps = gst_caps_from_string (template_caps);
+      if (!caps) {
+        GST_DEBUG
+            ("Could not parse src template caps '%s' for element '%s', using default '%s'",
+            template_caps, element_name, class_data->default_src_template_caps);
+        caps = gst_caps_from_string (class_data->default_src_template_caps);
+        g_assert (caps != NULL);
+      }
     }
+    templ = gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS, caps);
+    g_free (template_caps);
+    gst_element_class_add_pad_template (element_class, templ);
   }
-  templ = gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS, caps);
-  g_free (template_caps);
-  gst_element_class_add_pad_template (element_class, templ);
 
   if ((hacks =
           g_key_file_get_string_list (config, element_name, "hacks", NULL,

omx/gstomx.h

@@ -156,6 +156,12 @@ typedef enum {
   GST_OMX_MESSAGE_BUFFER_DONE,
 } GstOMXMessageType;
 
+typedef enum {
+  GST_OMX_COMPONENT_TYPE_SINK,
+  GST_OMX_COMPONENT_TYPE_SOURCE,
+  GST_OMX_COMPONENT_TYPE_FILTER
+} GstOmxComponentType;
+
 struct _GstOMXMessage {
   GstOMXMessageType type;
 
@@ -272,6 +278,8 @@ struct _GstOMXClassData {
   guint32 in_port_index, out_port_index;
 
   guint64 hacks;
+
+  GstOmxComponentType type;
 };
 
 GKeyFile *        gst_omx_get_configuration (void);

omx/gstomxaudioenc.c

@@ -85,6 +85,7 @@ gst_omx_audio_enc_class_init (GstOMXAudioEncClass * klass)
   audio_encoder_class->sink_event =
       GST_DEBUG_FUNCPTR (gst_omx_audio_enc_sink_event);
 
+  klass->cdata.type = GST_OMX_COMPONENT_TYPE_FILTER;
   klass->cdata.default_sink_template_caps = "audio/x-raw, "
       "rate = (int) [ 1, MAX ], "
       "channels = (int) [ 1, " G_STRINGIFY (OMX_AUDIO_MAXCHANNELS) " ], "

omx/gstomxvideodec.c

@@ -727,6 +727,7 @@ gst_omx_video_dec_class_init (GstOMXVideoDecClass * klass)
   video_decoder_class->decide_allocation =
       GST_DEBUG_FUNCPTR (gst_omx_video_dec_decide_allocation);
 
+  klass->cdata.type = GST_OMX_COMPONENT_TYPE_FILTER;
   klass->cdata.default_src_template_caps = "video/x-raw, "
       "width = " GST_VIDEO_SIZE_RANGE ", "
       "height = " GST_VIDEO_SIZE_RANGE ", " "framerate = " GST_VIDEO_FPS_RANGE;

omx/gstomxvideoenc.c

@@ -192,6 +192,7 @@ gst_omx_video_enc_class_init (GstOMXVideoEncClass * klass)
       GST_DEBUG_FUNCPTR (gst_omx_video_enc_propose_allocation);
   video_encoder_class->getcaps = GST_DEBUG_FUNCPTR (gst_omx_video_enc_getcaps);
 
+  klass->cdata.type = GST_OMX_COMPONENT_TYPE_FILTER;
   klass->cdata.default_sink_template_caps = "video/x-raw, "
       "width = " GST_VIDEO_SIZE_RANGE ", "
       "height = " GST_VIDEO_SIZE_RANGE ", " "framerate = " GST_VIDEO_FPS_RANGE;