gstreamer/ext/gsettings/gstgsettingsvideosink.c

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/* GStreamer
* Copyright (C) 2010 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-gsettingsvideosink
*
* This element outputs sound to the videosink that has been configured in
* GSettings by the user.
*
* <refsect2>
* <title>Example launch line</title>
* |[
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* gst-launch videotestsrc ! videoconvert ! videoscale ! gsettingsvideosink
* ]| Play on configured videosink
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gst/gst.h>
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#include <gst/glib-compat-private.h>
#include <string.h>
#include "gstgsettingsvideosink.h"
#include "gstgsettings.h"
GST_BOILERPLATE (GstGSettingsVideoSink, gst_gsettings_video_sink, GstSwitchSink,
GST_TYPE_SWITCH_SINK);
static gboolean
gst_gsettings_video_sink_change_child (GstGSettingsVideoSink * sink)
{
gchar *new_string;
GError *err = NULL;
GstElement *new_kid;
GST_OBJECT_LOCK (sink);
new_string =
g_settings_get_string (sink->settings, GST_GSETTINGS_KEY_VIDEOSINK);
if (new_string != NULL && sink->gsettings_str != NULL &&
(strlen (new_string) == 0 ||
strcmp (sink->gsettings_str, new_string) == 0)) {
g_free (new_string);
GST_DEBUG_OBJECT (sink,
"GSettings key was updated, but it didn't change. Ignoring");
GST_OBJECT_UNLOCK (sink);
return TRUE;
}
GST_OBJECT_UNLOCK (sink);
GST_DEBUG_OBJECT (sink, "GSettings key changed from '%s' to '%s'",
GST_STR_NULL (sink->gsettings_str), GST_STR_NULL (new_string));
if (new_string) {
new_kid = gst_parse_bin_from_description (new_string, TRUE, &err);
if (err) {
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GST_ERROR_OBJECT (sink, "error creating bin '%s': %s", new_string,
err->message);
g_error_free (err);
}
} else {
new_kid = NULL;
}
if (new_kid == NULL) {
GST_ELEMENT_ERROR (sink, LIBRARY, SETTINGS, (NULL),
("Failed to render video sink from GSettings"));
goto fail;
}
if (!gst_switch_sink_set_child (GST_SWITCH_SINK (sink), new_kid)) {
GST_WARNING_OBJECT (sink, "Failed to update child element");
goto fail;
}
g_free (sink->gsettings_str);
sink->gsettings_str = new_string;
return TRUE;
fail:
g_free (new_string);
return FALSE;
}
static void
on_changed (GSettings * settings, gchar * key, GstGSettingsVideoSink * sink)
{
if (!g_str_has_suffix (key, "videosink"))
return;
gst_gsettings_video_sink_change_child (sink);
}
static gboolean
gst_gsettings_video_sink_start (GstGSettingsVideoSink * sink)
{
GError *err = NULL;
GThread *thread;
sink->loop = g_main_loop_new (sink->context, FALSE);
thread =
g_thread_create ((GThreadFunc) g_main_loop_run, sink->loop, FALSE, &err);
if (!thread) {
GST_ELEMENT_ERROR (sink, CORE, STATE_CHANGE, (NULL),
("Failed to create new thread: %s", err->message));
g_error_free (err);
g_main_loop_unref (sink->loop);
sink->loop = NULL;
return FALSE;
}
g_main_context_push_thread_default (sink->context);
sink->settings = g_settings_new (GST_GSETTINGS_SCHEMA);
sink->changed_id =
g_signal_connect_data (G_OBJECT (sink->settings), "changed",
G_CALLBACK (on_changed), gst_object_ref (sink),
(GClosureNotify) gst_object_unref, 0);
g_main_context_pop_thread_default (sink->context);
return TRUE;
}
static gboolean
gst_gsettings_video_sink_reset (GstGSettingsVideoSink * sink)
{
gst_switch_sink_set_child (GST_SWITCH_SINK (sink), NULL);
if (sink->changed_id) {
g_signal_handler_disconnect (sink->settings, sink->changed_id);
sink->changed_id = 0;
}
if (sink->loop) {
g_main_loop_quit (sink->loop);
g_main_loop_unref (sink->loop);
sink->loop = NULL;
}
if (sink->settings) {
g_object_unref (sink->settings);
sink->settings = NULL;
}
GST_OBJECT_LOCK (sink);
g_free (sink->gsettings_str);
sink->gsettings_str = NULL;
GST_OBJECT_UNLOCK (sink);
return TRUE;
}
static void
gst_gsettings_video_sink_finalize (GObject * object)
{
GstGSettingsVideoSink *sink = GST_GSETTINGS_VIDEO_SINK (object);
g_free (sink->gsettings_str);
g_main_context_unref (sink->context);
GST_CALL_PARENT (G_OBJECT_CLASS, finalize, ((GObject *) (sink)));
}
static GstStateChangeReturn
gst_gsettings_video_sink_change_state (GstElement * element,
GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstGSettingsVideoSink *sink = GST_GSETTINGS_VIDEO_SINK (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!gst_gsettings_video_sink_start (sink))
return GST_STATE_CHANGE_FAILURE;
if (!gst_gsettings_video_sink_change_child (sink)) {
gst_gsettings_video_sink_reset (sink);
return GST_STATE_CHANGE_FAILURE;
}
break;
default:
break;
}
ret = GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS, change_state,
(element, transition), GST_STATE_CHANGE_SUCCESS);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
gst_gsettings_video_sink_reset (sink);
break;
default:
break;
}
return ret;
}
static void
gst_gsettings_video_sink_init (GstGSettingsVideoSink * sink,
GstGSettingsVideoSinkClass * g_class)
{
sink->context = g_main_context_new ();
gst_gsettings_video_sink_reset (sink);
}
static void
gst_gsettings_video_sink_base_init (gpointer klass)
{
GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
gst_element_class_set_metadata (eklass, "GSettings video sink",
"Sink/Video",
"Video sink embedding the GSettings preferences for video input",
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
}
static void
gst_gsettings_video_sink_class_init (GstGSettingsVideoSinkClass * klass)
{
GObjectClass *oklass = G_OBJECT_CLASS (klass);
GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
oklass->finalize = gst_gsettings_video_sink_finalize;
eklass->change_state = gst_gsettings_video_sink_change_state;
}