#define DEFAULT_DELAY 0
#define DEFAULT_AUTO_FLUSH_BUS TRUE
+#define DEFAULT_LATENCY GST_CLOCK_TIME_NONE
enum
{
PROP_0,
PROP_DELAY,
- PROP_AUTO_FLUSH_BUS
+ PROP_AUTO_FLUSH_BUS,
+ PROP_LATENCY
};
#define GST_PIPELINE_GET_PRIVATE(obj) \
* PLAYING*/
GstClockTime last_start_time;
gboolean update_clock;
+
+ GstClockTime latency;
};
GstStateChange transition);
static void gst_pipeline_handle_message (GstBin * bin, GstMessage * message);
+static gboolean gst_pipeline_do_latency (GstBin * bin);
/* static guint gst_pipeline_signals[LAST_SIGNAL] = { 0 }; */
"from READY into NULL state", DEFAULT_AUTO_FLUSH_BUS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+ /**
+ * GstPipeline:latency:
+ *
+ * Latency to configure on the pipeline. See gst_pipeline_set_latency().
+ *
+ * Since: 1.6
+ **/
+ g_object_class_install_property (gobject_class, PROP_LATENCY,
+ g_param_spec_uint64 ("latency", "Latency",
+ "Latency to configure on the pipeline", 0, G_MAXUINT64,
+ DEFAULT_LATENCY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
gobject_class->dispose = gst_pipeline_dispose;
gst_element_class_set_static_metadata (gstelement_class, "Pipeline object",
GST_DEBUG_FUNCPTR (gst_pipeline_provide_clock_func);
gstbin_class->handle_message =
GST_DEBUG_FUNCPTR (gst_pipeline_handle_message);
+ gstbin_class->do_latency = GST_DEBUG_FUNCPTR (gst_pipeline_do_latency);
}
static void
/* set default property values */
pipeline->priv->auto_flush_bus = DEFAULT_AUTO_FLUSH_BUS;
pipeline->delay = DEFAULT_DELAY;
+ pipeline->priv->latency = DEFAULT_LATENCY;
/* create and set a default bus */
bus = gst_bus_new ();
case PROP_AUTO_FLUSH_BUS:
gst_pipeline_set_auto_flush_bus (pipeline, g_value_get_boolean (value));
break;
+ case PROP_LATENCY:
+ gst_pipeline_set_latency (pipeline, g_value_get_uint64 (value));
+ break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
case PROP_AUTO_FLUSH_BUS:
g_value_set_boolean (value, gst_pipeline_get_auto_flush_bus (pipeline));
break;
+ case PROP_LATENCY:
+ g_value_set_uint64 (value, gst_pipeline_get_latency (pipeline));
+ break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
GST_BIN_CLASS (parent_class)->handle_message (bin, message);
}
+static gboolean
+gst_pipeline_do_latency (GstBin * bin)
+{
+ GstPipeline *pipeline = GST_PIPELINE (bin);
+ GstQuery *query;
+ GstClockTime latency;
+ GstClockTime min_latency, max_latency;
+ gboolean res;
+
+ GST_OBJECT_LOCK (pipeline);
+ latency = pipeline->priv->latency;
+ GST_OBJECT_UNLOCK (pipeline);
+
+ if (latency == GST_CLOCK_TIME_NONE)
+ return GST_BIN_CLASS (parent_class)->do_latency (bin);
+
+ GST_DEBUG_OBJECT (pipeline, "querying latency");
+
+ query = gst_query_new_latency ();
+ if ((res = gst_element_query (GST_ELEMENT_CAST (pipeline), query))) {
+ gboolean live;
+
+ gst_query_parse_latency (query, &live, &min_latency, &max_latency);
+
+ GST_DEBUG_OBJECT (pipeline,
+ "got min latency %" GST_TIME_FORMAT ", max latency %"
+ GST_TIME_FORMAT ", live %d", GST_TIME_ARGS (min_latency),
+ GST_TIME_ARGS (max_latency), live);
+
+ if (max_latency < min_latency) {
+ /* this is an impossible situation, some parts of the pipeline might not
+ * work correctly. We post a warning for now. */
+ GST_ELEMENT_WARNING (pipeline, CORE, CLOCK, (NULL),
+ ("Impossible to configure latency: max %" GST_TIME_FORMAT " < min %"
+ GST_TIME_FORMAT ". Add queues or other buffering elements.",
+ GST_TIME_ARGS (max_latency), GST_TIME_ARGS (min_latency)));
+ }
+
+ if (latency < min_latency) {
+ /* This is a problematic situation as we will most likely drop lots of
+ * data if we configure a too low latency */
+ GST_ELEMENT_WARNING (pipeline, CORE, CLOCK, (NULL),
+ ("Configured latency is lower than detected minimum latency: configured %"
+ GST_TIME_FORMAT " < min %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (latency), GST_TIME_ARGS (min_latency)));
+ }
+ } else {
+ /* this is not a real problem, we just don't configure any latency. */
+ GST_WARNING_OBJECT (pipeline, "failed to query latency");
+ }
+ gst_query_unref (query);
+
+
+ /* configure latency on elements */
+ res =
+ gst_element_send_event (GST_ELEMENT_CAST (pipeline),
+ gst_event_new_latency (latency));
+ if (res) {
+ GST_INFO_OBJECT (pipeline, "configured latency of %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (latency));
+ } else {
+ GST_WARNING_OBJECT (pipeline,
+ "did not really configure latency of %" GST_TIME_FORMAT,
+ GST_TIME_ARGS (latency));
+ }
+
+ return res;
+}
+
/**
* gst_pipeline_get_bus:
* @pipeline: a #GstPipeline
return res;
}
+
+/**
+ * gst_pipeline_set_latency:
+ * @pipeline: a #GstPipeline
+ * @latency: latency to configure
+ *
+ * Sets the latency that should be configured on the pipeline. Setting
+ * GST_CLOCK_TIME_NONE will restore the default behaviour of using the minimum
+ * latency from the LATENCY query. Setting this is usually not required and
+ * the pipeline will figure out an appropriate latency automatically.
+ *
+ * Setting a too low latency, especially lower than the minimum latency from
+ * the LATENCY query, will most likely cause the pipeline to fail.
+ *
+ * Since: 1.6
+ */
+void
+gst_pipeline_set_latency (GstPipeline * pipeline, GstClockTime latency)
+{
+ gboolean changed;
+
+ g_return_if_fail (GST_IS_PIPELINE (pipeline));
+
+ GST_OBJECT_LOCK (pipeline);
+ changed = (pipeline->priv->latency != latency);
+ pipeline->priv->latency = latency;
+ GST_OBJECT_UNLOCK (pipeline);
+
+ if (changed)
+ gst_bin_recalculate_latency (GST_BIN_CAST (pipeline));
+}
+
+/**
+ * gst_pipeline_get_latency:
+ * @pipeline: a #GstPipeline
+ *
+ * Gets the latency that should be configured on the pipeline. See
+ * gst_pipeline_set_latency().
+ *
+ * Returns: Latency to configure on the pipeline or GST_CLOCK_TIME_NONE
+ *
+ * Since: 1.6
+ */
+
+GstClockTime
+gst_pipeline_get_latency (GstPipeline * pipeline)
+{
+ GstClockTime latency;
+
+ g_return_val_if_fail (GST_IS_PIPELINE (pipeline), GST_CLOCK_TIME_NONE);
+
+ GST_OBJECT_LOCK (pipeline);
+ latency = pipeline->priv->latency;
+ GST_OBJECT_UNLOCK (pipeline);
+
+ return latency;
+}
projects / platform / upstream / gstreamer.git / commitdiff