gst-validate-scenario: add emit-signal

emit-signal action allows to emit signals to elements in scenarios.
The implementation only accepts signals without arguments for now but
it can be extended to use parameters if needed in the future

2 files changed, 50 insertions, 4 deletions

diff --git a/validate/data/camerabin_signal.scenario b/validate/data/camerabin_signal.scenario
new file mode 100644
index 0000000..74dfe42
--- /dev/null
+++ b/validate/data/camerabin_signal.scenario
@@ -0,0 +1,4 @@
+description, duration=20.0
+emit-signal, target-element-name=camerabin0, signal-name=start-capture, playback_time=10.0
+eos, playback_time=20.0
+
diff --git a/validate/gst/validate/gst-validate-scenario.c b/validate/gst/validate/gst-validate-scenario.c
index 55cd836..b9dd381 100644
--- a/validate/gst/validate/gst-validate-scenario.c
+++ b/validate/gst/validate/gst-validate-scenario.c
@@ -853,6 +853,25 @@ _execute_dot_pipeline (GstValidateScenario * scenario,
   return TRUE;
 }
 
+static GstElement *
+_get_target_element (GstValidateScenario * scenario, GstValidateAction * action)
+{
+  const gchar *name;
+  GstElement *target;
+
+  name = gst_structure_get_string (action->structure, "target-element-name");
+  if (strcmp (GST_OBJECT_NAME (scenario->pipeline), name) == 0) {
+    target = gst_object_ref (scenario->pipeline);
+  } else {
+    target = gst_bin_get_by_name (GST_BIN (scenario->pipeline), name);
+  }
+
+  if (target == NULL) {
+    GST_ERROR ("Target element with given name (%s) not found", name);
+  }
+  return target;
+}
+
 static gboolean
 _object_set_property (GObject * object, const gchar * property,
     const GValue * value)
@@ -876,15 +895,12 @@ _execute_set_property (GstValidateScenario * scenario,
     GstValidateAction * action)
 {
   GstElement *target;
-  const gchar *name;
   const gchar *property;
   const GValue *property_value;
   gboolean ret;
 
-  name = gst_structure_get_string (action->structure, "target-element-name");
-  target = gst_bin_get_by_name (GST_BIN (scenario->pipeline), name);
+  target = _get_target_element (scenario, action);
   if (target == NULL) {
-    GST_ERROR ("Target element with given name (%s) not found", name);
     return FALSE;
   }
 
@@ -933,6 +949,27 @@ _execute_set_debug_threshold (GstValidateScenario * scenario,
   return TRUE;
 }
 
+static gboolean
+_execute_emit_signal (GstValidateScenario * scenario,
+    GstValidateAction * action)
+{
+  GstElement *target;
+  const gchar *signal_name;
+
+  target = _get_target_element (scenario, action);
+  if (target == NULL) {
+    return FALSE;
+  }
+
+  signal_name = gst_structure_get_string (action->structure, "signal-name");
+
+  /* Right now we don't support arguments to signals as there weren't any use
+   * cases to cover yet but it should be possible to do so */
+  g_signal_emit_by_name (target, signal_name, NULL);
+
+  gst_object_unref (target);
+  return TRUE;
+}
 
 static void
 gst_validate_scenario_update_segment_from_seek (GstValidateScenario * scenario,
@@ -1775,6 +1812,8 @@ init_scenarios (void)
       { "target-element-name", "property-name", "property-value", NULL };
   const gchar *set_debug_threshold_mandatory_fields[] =
       { "debug-threshold", NULL };
+  const gchar *emit_signal_mandatory_fields[] =
+      { "target-element-name", "signal-name", NULL };
 
   GST_DEBUG_CATEGORY_INIT (gst_validate_scenario_debug, "gstvalidatescenario",
       GST_DEBUG_FG_YELLOW, "Gst validate scenarios");
@@ -1821,4 +1860,7 @@ init_scenarios (void)
       _execute_set_debug_threshold, set_debug_threshold_mandatory_fields,
       "Sets the debug level to be used, same format as "
       "setting the GST_DEBUG env variable", FALSE);
+  gst_validate_add_action_type ("emit-signal", _execute_emit_signal,
+      emit_signal_mandatory_fields,
+      "Allows to emit a signal to an element in the pipeline", FALSE);
 }