gstreamer/sys/oss4/oss4-mixer-switch.c

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/* GStreamer OSS4 mixer on/off switch control
* Copyright (C) 2007-2008 Tim-Philipp Müller <tim centricular net>
*
* 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.
*/
/* A simple ON/OFF 'switch' in gnome-volume-control / GstMixer is represented
* by a GstMixerTrack with no channels.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst-i18n-plugin.h>
#define NO_LEGACY_MIXER
#include "oss4-mixer-switch.h"
#include "oss4-soundcard.h"
GST_DEBUG_CATEGORY_EXTERN (oss4mixer_debug);
#define GST_CAT_DEFAULT oss4mixer_debug
/* GstMixerTrack is a plain GObject, so let's just use the GLib macro here */
G_DEFINE_TYPE (GstOss4MixerSwitch, gst_oss4_mixer_switch, GST_TYPE_MIXER_TRACK);
static void
gst_oss4_mixer_switch_class_init (GstOss4MixerSwitchClass * klass)
{
/* nothing to do here */
}
static void
gst_oss4_mixer_switch_init (GstOss4MixerSwitch * s)
{
/* nothing to do here */
}
static GstMixerTrackFlags
gst_oss4_mixer_switch_get_switch_flag (GstMixerTrack * track)
{
if ((track->flags & GST_MIXER_TRACK_INPUT)) {
return GST_MIXER_TRACK_RECORD;
} else if ((track->flags & GST_MIXER_TRACK_OUTPUT)) {
return GST_MIXER_TRACK_MUTE;
} else {
GST_ERROR_OBJECT (track, "switch neither input nor output track!?");
}
return 0;
}
gboolean
gst_oss4_mixer_switch_set (GstOss4MixerSwitch * s, gboolean enabled)
{
GstMixerTrackFlags switch_flag;
GstMixerTrack *track;
int newval;
track = GST_MIXER_TRACK (s);
switch_flag = gst_oss4_mixer_switch_get_switch_flag (track);
newval = (enabled) ? 1 : 0;
if (!!newval == !!(track->flags & switch_flag)) {
GST_LOG_OBJECT (s, "switch is already %d, doing nothing", newval);
return TRUE;
}
if (!gst_oss4_mixer_set_control_val (s->mixer, s->mc, newval)) {
GST_WARNING_OBJECT (s, "could not set switch to %d", newval);
return FALSE;
}
if (newval) {
track->flags |= switch_flag;
} else {
track->flags &= ~switch_flag;
}
GST_LOG_OBJECT (s, "set switch to %d", newval);
return TRUE;
}
gboolean
gst_oss4_mixer_switch_get (GstOss4MixerSwitch * s, gboolean * enabled)
{
GstMixerTrackFlags switch_flag;
GstMixerTrack *track;
int val = -1;
track = GST_MIXER_TRACK (s);
switch_flag = gst_oss4_mixer_switch_get_switch_flag (track);
if (!gst_oss4_mixer_get_control_val (s->mixer, s->mc, &val) || val < 0) {
GST_WARNING_OBJECT (s, "could not get switch state");
return FALSE;
}
*enabled = (val != 0);
if (!!val != !!(track->flags & switch_flag)) {
GST_INFO_OBJECT (s, "updating inconsistent switch state to %d", !!val);
if (*enabled) {
track->flags |= switch_flag;
} else {
track->flags &= ~switch_flag;
}
}
return TRUE;
}
GstMixerTrack *
gst_oss4_mixer_switch_new (GstOss4Mixer * mixer, GstOss4MixerControl * mc)
{
GstOss4MixerSwitch *s;
GstMixerTrack *track;
int cur = -1;
s = g_object_new (GST_TYPE_OSS4_MIXER_SWITCH, "untranslated-label",
mc->mixext.extname, NULL);
s->mixer = mixer;
s->mc = mc;
track = GST_MIXER_TRACK (s);
/* caller will set track->label and track->flags */
track->num_channels = 0;
track->min_volume = 0;
track->max_volume = 0;
if (!gst_oss4_mixer_get_control_val (s->mixer, s->mc, &cur) || cur < 0)
return NULL;
return track;
}
/* This is called from the watch thread */
void
gst_oss4_mixer_switch_process_change_unlocked (GstMixerTrack * track)
{
GstOss4MixerSwitch *s = GST_OSS4_MIXER_SWITCH_CAST (track);
if (!s->mc->changed)
return;
if ((track->flags & GST_MIXER_TRACK_INPUT)) {
gst_mixer_record_toggled (GST_MIXER (s->mixer), track, !!s->mc->last_val);
} else {
gst_mixer_mute_toggled (GST_MIXER (s->mixer), track, !!s->mc->last_val);
}
}