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/*
* Copyright 2015 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3, as published
* by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranties of
* MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Charles Kerr <charles.kerr@canonical.com>
*/
#include "sound.h"
#include <glib.h>
#include <gst/gst.h>
static void
gst_init_once(void)
{
static gboolean gst_init_checked = FALSE;
if (G_UNLIKELY(!gst_init_checked))
{
GError* error = NULL;
if (!gst_init_check(NULL, NULL, &error))
{
g_critical("Unable to play alarm sound: %s", error->message);
g_error_free(error);
}
gst_init_checked = TRUE;
}
}
static gboolean bus_callback(GstBus* bus G_GNUC_UNUSED, GstMessage* msg, gpointer gelement)
{
const GstMessageType message_type = GST_MESSAGE_TYPE(msg);
if (GST_MESSAGE_SRC(msg) != gelement)
return G_SOURCE_CONTINUE;
/* on eos, cleanup the element and cancel our gst bus subscription */
if (message_type == GST_MESSAGE_EOS)
{
g_debug("got GST_MESSAGE_EOS on sound play");
gst_element_set_state(GST_ELEMENT(gelement), GST_STATE_NULL);
gst_object_unref(gelement);
return G_SOURCE_REMOVE;
}
/* on stream start, set the media role to 'alert' if we're using pulsesink */
if (message_type == GST_MESSAGE_STREAM_START)
{
GstElement* audio_sink = NULL;
g_debug("got GST_MESSAGE_STREAM_START on sound play");
g_object_get(gelement, "audio-sink", &audio_sink, NULL);
if (audio_sink != NULL)
{
GstPluginFeature* feature;
feature = GST_PLUGIN_FEATURE_CAST(GST_ELEMENT_GET_CLASS(audio_sink)->elementfactory);
if (feature && g_strcmp0(gst_plugin_feature_get_name(feature), "pulsesink") == 0)
{
const gchar* const props_str = "props,media.role=alert";
GstStructure* props = gst_structure_from_string(props_str, NULL);
g_debug("setting audio sink properties to '%s'", props_str);
g_object_set(audio_sink, "stream-properties", props, NULL);
g_clear_pointer(&props, gst_structure_free);
}
gst_object_unref(audio_sink);
}
}
return G_SOURCE_CONTINUE;
}
void
sound_play_uri(const char* uri)
{
GstElement * element;
GstBus * bus;
gst_init_once();
element = gst_element_factory_make("playbin", NULL);
/* start listening for gst events */
bus = gst_pipeline_get_bus(GST_PIPELINE(element));
gst_bus_add_watch(bus, bus_callback, element);
gst_object_unref(bus);
/* play the sound */
g_debug("Playing '%s'", uri);
g_object_set(element, "uri", uri, NULL);
gst_element_set_state(element, GST_STATE_PLAYING);
}
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