ahc2src: implement get_capabilities

Signed-off-by: Justin Kim <justin.kim@collabora.com>

sys/androidmedia/gstahc2src.c

@@ -177,6 +177,43 @@ enum
 
 static guint signals[LAST_SIGNAL] = { 0 };
 
+static GstPhotographyCaps
+gst_ahc2_src_get_capabilities (GstPhotography * photo)
+{
+  GstAHC2Src *self = GST_AHC2_SRC (photo);
+  GstAHC2SrcPrivate *priv = GST_AHC2_SRC_GET_PRIVATE (self);
+
+  GstPhotographyCaps caps = GST_PHOTOGRAPHY_CAPS_EV_COMP |
+      GST_PHOTOGRAPHY_CAPS_WB_MODE | GST_PHOTOGRAPHY_CAPS_TONE |
+      GST_PHOTOGRAPHY_CAPS_SCENE | GST_PHOTOGRAPHY_CAPS_FLASH |
+      GST_PHOTOGRAPHY_CAPS_FOCUS;
+
+  ACameraMetadata* metadata = NULL;
+  ACameraMetadata_const_entry entry;
+
+  g_return_val_if_fail (priv->camera_manager != NULL, caps);
+  g_return_val_if_fail (priv->camera_id_list != NULL, caps);
+  g_return_val_if_fail (priv->camera_index < priv->camera_id_list->numCameras,
+      caps);
+
+  if (ACameraManager_getCameraCharacteristics (priv->camera_manager,
+      priv->camera_id_list->cameraIds[priv->camera_index],
+      &metadata) != ACAMERA_OK) {
+    return caps;
+  }
+  
+  if (ACameraMetadata_getConstEntry (metadata,
+      ACAMERA_LENS_INFO_AVAILABLE_FOCAL_LENGTHS, &entry) == ACAMERA_OK) {
+    if (entry.count > 1) {
+      caps |= GST_PHOTOGRAPHY_CAPS_ZOOM;
+    }
+  }
+
+  g_clear_pointer (&metadata, (GDestroyNotify) ACameraMetadata_free);
+
+  return caps;
+}
+
 static gboolean
 gst_ahc2_src_get_white_balance_mode (GstPhotography * photo,
     GstPhotographyWhiteBalanceMode * mode)
@@ -738,6 +775,14 @@ gst_ahc2_src_get_property (GObject * object,
     case PROP_MAX_IMAGES:
       g_value_set_int (value, priv->max_images);
       break;
+    case PROP_CAPABILITIES:{
+      GstPhotographyCaps caps;
+
+      caps = gst_ahc2_src_get_capabilities (GST_PHOTOGRAPHY (self));
+      g_value_set_ulong (value, caps);
+
+      break;
+    }
     case PROP_WHITE_BALANCE_MODE: {
       GstPhotographyWhiteBalanceMode wb;
       if (gst_ahc2_src_get_white_balance_mode (GST_PHOTOGRAPHY (self), &wb))
@@ -1195,6 +1240,8 @@ gst_ahc2_src_photography_init (gpointer g_iface, gpointer iface_data)
 {
   GstPhotographyInterface *iface = g_iface;
 
+  iface->get_capabilities = gst_ahc2_src_get_capabilities;
+
   iface->get_white_balance_mode = gst_ahc2_src_get_white_balance_mode;
   iface->set_white_balance_mode = gst_ahc2_src_set_white_balance_mode;
 }