gstreamer/gst/debugutils/gstwatchdog.c

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/* GStreamer
* Copyright (C) 2013 Rdio <ingestions@rdio.com>
* Copyright (C) 2013 David Schleef <ds@schleef.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
* Boston, MA 02110-1335, USA.
*/
/**
* SECTION:element-gstwatchdog
*
* The watchdog element watches buffers and events flowing through
* a pipeline. If no buffers are seen for a configurable amount of
* time, a error message is sent to the bus.
*
* To use this element, insert it into a pipeline as you would an
* identity element. Once activated, any pause in the flow of
* buffers through the element will cause an element error. The
* maximum allowed pause is determined by the timeout property.
*
* This element is currently intended for transcoding pipelines,
* although may be useful in other contexts.
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*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v fakesrc ! watchdog ! fakesink
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include "gstwatchdog.h"
GST_DEBUG_CATEGORY_STATIC (gst_watchdog_debug_category);
#define GST_CAT_DEFAULT gst_watchdog_debug_category
/* prototypes */
static void gst_watchdog_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_watchdog_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec);
static gboolean gst_watchdog_start (GstBaseTransform * trans);
static gboolean gst_watchdog_stop (GstBaseTransform * trans);
static gboolean gst_watchdog_sink_event (GstBaseTransform * trans,
GstEvent * event);
static gboolean gst_watchdog_src_event (GstBaseTransform * trans,
GstEvent * event);
static GstFlowReturn gst_watchdog_transform_ip (GstBaseTransform * trans,
GstBuffer * buf);
static void gst_watchdog_feed (GstWatchdog * watchdog);
static GstStateChangeReturn
gst_watchdog_change_state (GstElement * element, GstStateChange transition);
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enum
{
PROP_0,
PROP_TIMEOUT
};
/* class initialization */
G_DEFINE_TYPE_WITH_CODE (GstWatchdog, gst_watchdog, GST_TYPE_BASE_TRANSFORM,
GST_DEBUG_CATEGORY_INIT (gst_watchdog_debug_category, "watchdog", 0,
"debug category for watchdog element"));
static void
gst_watchdog_class_init (GstWatchdogClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBaseTransformClass *base_transform_class =
GST_BASE_TRANSFORM_CLASS (klass);
GstElementClass *gstelement_klass = (GstElementClass *) klass;
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gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
gst_caps_new_any ()));
gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
gst_caps_new_any ()));
gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
"Watchdog", "Generic", "Watches for pauses in stream buffers",
"David Schleef <ds@schleef.org>");
gstelement_klass->change_state =
GST_DEBUG_FUNCPTR (gst_watchdog_change_state);
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gobject_class->set_property = gst_watchdog_set_property;
gobject_class->get_property = gst_watchdog_get_property;
base_transform_class->start = GST_DEBUG_FUNCPTR (gst_watchdog_start);
base_transform_class->stop = GST_DEBUG_FUNCPTR (gst_watchdog_stop);
base_transform_class->sink_event =
GST_DEBUG_FUNCPTR (gst_watchdog_sink_event);
base_transform_class->src_event = GST_DEBUG_FUNCPTR (gst_watchdog_src_event);
base_transform_class->transform_ip =
GST_DEBUG_FUNCPTR (gst_watchdog_transform_ip);
g_object_class_install_property (gobject_class, PROP_TIMEOUT,
g_param_spec_int ("timeout", "Timeout", "Timeout (in ms) after "
"which an element error is sent to the bus if no buffers are "
"received. 0 means disabled.", 0, G_MAXINT, 1000,
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G_PARAM_CONSTRUCT | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
gst_watchdog_init (GstWatchdog * watchdog)
{
}
void
gst_watchdog_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstWatchdog *watchdog = GST_WATCHDOG (object);
GST_DEBUG_OBJECT (watchdog, "set_property");
switch (property_id) {
case PROP_TIMEOUT:
GST_OBJECT_LOCK (watchdog);
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watchdog->timeout = g_value_get_int (value);
gst_watchdog_feed (watchdog);
GST_OBJECT_UNLOCK (watchdog);
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break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_watchdog_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstWatchdog *watchdog = GST_WATCHDOG (object);
GST_DEBUG_OBJECT (watchdog, "get_property");
switch (property_id) {
case PROP_TIMEOUT:
g_value_set_int (value, watchdog->timeout);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gpointer
gst_watchdog_thread (gpointer user_data)
{
GstWatchdog *watchdog = GST_WATCHDOG (user_data);
GST_DEBUG_OBJECT (watchdog, "thread starting");
g_main_loop_run (watchdog->main_loop);
GST_DEBUG_OBJECT (watchdog, "thread exiting");
return NULL;
}
static gboolean
gst_watchdog_trigger (gpointer ptr)
{
GstWatchdog *watchdog = GST_WATCHDOG (ptr);
GST_DEBUG_OBJECT (watchdog, "watchdog triggered");
GST_ELEMENT_ERROR (watchdog, STREAM, FAILED, ("Watchdog triggered"),
("Watchdog triggered"));
return FALSE;
}
static gboolean
gst_watchdog_quit_mainloop (gpointer ptr)
{
GstWatchdog *watchdog = GST_WATCHDOG (ptr);
GST_DEBUG_OBJECT (watchdog, "watchdog quit");
g_main_loop_quit (watchdog->main_loop);
return FALSE;
}
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static void
gst_watchdog_feed (GstWatchdog * watchdog)
{
if (watchdog->source) {
g_source_destroy (watchdog->source);
g_source_unref (watchdog->source);
watchdog->source = NULL;
}
if (watchdog->timeout != 0 && watchdog->main_context) {
watchdog->source = g_timeout_source_new (watchdog->timeout);
g_source_set_callback (watchdog->source, gst_watchdog_trigger, gst_object_ref (watchdog),
gst_object_unref);
g_source_attach (watchdog->source, watchdog->main_context);
}
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}
static gboolean
gst_watchdog_start (GstBaseTransform * trans)
{
GstWatchdog *watchdog = GST_WATCHDOG (trans);
GST_DEBUG_OBJECT (watchdog, "start");
GST_OBJECT_LOCK (watchdog);
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watchdog->main_context = g_main_context_new ();
watchdog->main_loop = g_main_loop_new (watchdog->main_context, TRUE);
watchdog->thread = g_thread_new ("watchdog", gst_watchdog_thread, watchdog);
GST_OBJECT_UNLOCK (watchdog);
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return TRUE;
}
static gboolean
gst_watchdog_stop (GstBaseTransform * trans)
{
GstWatchdog *watchdog = GST_WATCHDOG (trans);
GSource *quit_source;
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GST_DEBUG_OBJECT (watchdog, "stop");
GST_OBJECT_LOCK (watchdog);
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if (watchdog->source) {
g_source_destroy (watchdog->source);
g_source_unref (watchdog->source);
watchdog->source = NULL;
}
/* dispatch an idle event that trigger g_main_loop_quit to avoid race
* between g_main_loop_run and g_main_loop_quit */
quit_source = g_idle_source_new ();
g_source_set_callback (quit_source, gst_watchdog_quit_mainloop, watchdog,
NULL);
g_source_attach (quit_source, watchdog->main_context);
g_source_unref (quit_source);
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g_thread_join (watchdog->thread);
watchdog->thread = NULL;
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g_main_loop_unref (watchdog->main_loop);
watchdog->main_loop = NULL;
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g_main_context_unref (watchdog->main_context);
watchdog->main_context = NULL;
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GST_OBJECT_UNLOCK (watchdog);
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return TRUE;
}
static gboolean
gst_watchdog_sink_event (GstBaseTransform * trans, GstEvent * event)
{
GstWatchdog *watchdog = GST_WATCHDOG (trans);
GST_DEBUG_OBJECT (watchdog, "sink_event");
GST_OBJECT_LOCK (watchdog);
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gst_watchdog_feed (watchdog);
GST_OBJECT_UNLOCK (watchdog);
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return
GST_BASE_TRANSFORM_CLASS (gst_watchdog_parent_class)->sink_event (trans,
event);
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}
static gboolean
gst_watchdog_src_event (GstBaseTransform * trans, GstEvent * event)
{
GstWatchdog *watchdog = GST_WATCHDOG (trans);
GST_DEBUG_OBJECT (watchdog, "src_event");
GST_OBJECT_LOCK (watchdog);
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gst_watchdog_feed (watchdog);
GST_OBJECT_UNLOCK (watchdog);
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return GST_BASE_TRANSFORM_CLASS (gst_watchdog_parent_class)->src_event (trans,
event);
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}
static GstFlowReturn
gst_watchdog_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
{
GstWatchdog *watchdog = GST_WATCHDOG (trans);
GST_DEBUG_OBJECT (watchdog, "transform_ip");
GST_OBJECT_LOCK (watchdog);
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gst_watchdog_feed (watchdog);
GST_OBJECT_UNLOCK (watchdog);
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return GST_FLOW_OK;
}
/*
* Change state handler for the element.
*/
static GstStateChangeReturn
gst_watchdog_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstWatchdog *watchdog = GST_WATCHDOG (element);
GST_DEBUG_OBJECT (watchdog, "gst_watchdog_change_state");
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
/* Activate timer */
GST_OBJECT_LOCK (watchdog);
gst_watchdog_feed (watchdog);
GST_OBJECT_UNLOCK (watchdog);
break;
default:
break;
}
ret =
GST_ELEMENT_CLASS (gst_watchdog_parent_class)->change_state (element,
transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
/* Disable the timer */
GST_OBJECT_LOCK (watchdog);
if (watchdog->source) {
g_source_destroy (watchdog->source);
g_source_unref (watchdog->source);
watchdog->source = NULL;
}
GST_OBJECT_UNLOCK (watchdog);
break;
default:
break;
}
return ret;
}