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/*
* Copyright (C) 2006 Red Hat, Inc
*
* Sugar is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Sugar 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
#include <gst/gst.h>
#include <gst/audio/mixerutils.h>
#include <gst/interfaces/mixer.h>
#include <gst/interfaces/propertyprobe.h>
#include "sugar-audio-manager.h"
struct _SugarAudioManagerPrivate
{
GstMixer *mixer;
GstMixerTrack *track;
guint timer_id;
};
G_DEFINE_TYPE(SugarAudioManager, sugar_audio_manager, G_TYPE_OBJECT)
#define SUGAR_AUDIO_MANAGER_GET_PRIVATE(object) (G_TYPE_INSTANCE_GET_PRIVATE ((object), SUGAR_TYPE_AUDIO_MANAGER, SugarAudioManagerPrivate))
/* This is a modified version of code from gnome-control-center */
static gboolean
mixer_close_real(SugarAudioManager *manager)
{
if (manager->priv->mixer != NULL)
{
gst_element_set_state(GST_ELEMENT(manager->priv->mixer), GST_STATE_NULL);
gst_object_unref(GST_OBJECT(manager->priv->mixer));
g_object_unref(G_OBJECT(manager->priv->track));
manager->priv->mixer = NULL;
manager->priv->track = NULL;
}
manager->priv->timer_id = 0;
return FALSE;
}
static gboolean
set_mixer_helper(GstMixer *mixer, gpointer user_data)
{
const GList *tracks;
tracks = gst_mixer_list_tracks(mixer);
while (tracks != NULL) {
GstMixerTrack *track = GST_MIXER_TRACK(tracks->data);
if (GST_MIXER_TRACK_HAS_FLAG(track, GST_MIXER_TRACK_MASTER)) {
SugarAudioManager *manager;
manager = SUGAR_AUDIO_MANAGER(user_data);
manager->priv->mixer = mixer;
manager->priv->track = track;
/* no need to ref the mixer element */
g_object_ref(manager->priv->track);
return TRUE;
}
tracks = tracks->next;
}
return FALSE;
}
static gboolean
mixer_open(SugarAudioManager *manager)
{
GList *mixer_list;
if (manager->priv->timer_id != 0) {
g_source_remove (manager->priv->timer_id);
manager->priv->timer_id = 0;
return TRUE;
}
mixer_list = gst_audio_default_registry_mixer_filter
(set_mixer_helper, TRUE, manager);
if (mixer_list == NULL)
return FALSE;
/* do not unref the mixer as we keep the ref for manager->priv->mixer */
g_list_free (mixer_list);
return TRUE;
}
static void
mixer_close(SugarAudioManager *manager)
{
manager->priv->timer_id = g_timeout_add (4000, (GSourceFunc)mixer_close_real, manager);
}
void
sugar_audio_manager_set_volume (SugarAudioManager *manager,
int level)
{
gint i, *volumes, volume;
GstMixerTrack *track;
if (mixer_open(manager) == FALSE)
return;
track = manager->priv->track;
volume = CLAMP(level, 0, 100);
/* Rescale the volume from [0, 100] to [track min, track max]. */
volume = (volume / 100.0) * (track->max_volume - track->min_volume) +
track->min_volume;
volumes = g_new(gint, track->num_channels);
for (i = 0; i < track->num_channels; ++i)
volumes[i] = (gint)volume;
gst_mixer_set_volume(manager->priv->mixer, track, volumes);
g_free (volumes);
mixer_close(manager);
}
static void
sugar_audio_manager_finalize (GObject *object)
{
SugarAudioManager *manager = SUGAR_AUDIO_MANAGER(object);
mixer_close_real(manager);
G_OBJECT_CLASS(sugar_audio_manager_parent_class)->finalize(object);
}
static void
sugar_audio_manager_class_init(SugarAudioManagerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS(klass);
gst_init (NULL, NULL);
object_class->finalize = sugar_audio_manager_finalize;
g_type_class_add_private(klass, sizeof(SugarAudioManagerPrivate));
}
static void
sugar_audio_manager_init(SugarAudioManager *manager)
{
manager->priv = SUGAR_AUDIO_MANAGER_GET_PRIVATE(manager);
}
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