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

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/* GStreamer OSS4 mixer slider 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 'slider' in gnome-volume-control / GstMixer is represented by a
* GstMixerTrack with one or more channels.
*
* A slider should be either flagged as INPUT or OUTPUT (mostly because of
* gnome-volume-control being littered with g_asserts for everything it doesn't
* expect).
*
* From mixertrack.h:
* "Input tracks can have 'recording' enabled, which means that any input will
* be hearable into the speakers that are attached to the output. Mute is
* obvious."
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <gst/gst-i18n-plugin.h>
#define NO_LEGACY_MIXER
#include "oss4-mixer-slider.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 (GstOss4MixerSlider, gst_oss4_mixer_slider, GST_TYPE_MIXER_TRACK);
static void
gst_oss4_mixer_slider_class_init (GstOss4MixerSliderClass * klass)
{
/* nothing to do here */
}
static void
gst_oss4_mixer_slider_init (GstOss4MixerSlider * s)
{
/* nothing to do here */
}
static int
gst_oss4_mixer_slider_pack_volume (GstOss4MixerSlider * s, const gint * volumes)
{
int val = 0;
switch (s->mc->mixext.type) {
case MIXT_MONOSLIDER:
case MIXT_MONOSLIDER16:
case MIXT_SLIDER:
val = volumes[0];
break;
case MIXT_STEREOSLIDER:
val = ((volumes[1] & 0xff) << 8) | (volumes[0] & 0xff);
break;
case MIXT_STEREOSLIDER16:
val = ((volumes[1] & 0xffff) << 16) | (volumes[0] & 0xffff);
break;
default:
g_return_val_if_reached (0);
}
return val;
}
static void
gst_oss4_mixer_slider_unpack_volume (GstOss4MixerSlider * s, int v,
gint * volumes)
{
guint32 val; /* use uint so bitshifting the highest bit works right */
val = (guint32) v;
switch (s->mc->mixext.type) {
case MIXT_SLIDER:
volumes[0] = val;
break;
case MIXT_MONOSLIDER:
/* oss repeats the value in the upper bits, as if it was stereo */
volumes[0] = val & 0x00ff;
break;
case MIXT_MONOSLIDER16:
/* oss repeats the value in the upper bits, as if it was stereo */
volumes[0] = val & 0x0000ffff;
break;
case MIXT_STEREOSLIDER:
volumes[0] = (val & 0x00ff);
volumes[1] = (val & 0xff00) >> 8;
break;
case MIXT_STEREOSLIDER16:
volumes[0] = (val & 0x0000ffff);
volumes[1] = (val & 0xffff0000) >> 16;
break;
default:
g_return_if_reached ();
}
}
gboolean
gst_oss4_mixer_slider_get_volume (GstOss4MixerSlider * s, gint * volumes)
{
GstMixerTrack *track = GST_MIXER_TRACK (s);
int v = 0;
/* if we're supposed to be muted, and don't have an actual mute control
* (ie. 'simulate' the mute), then just return the volume as saved, not
* the actually set volume which is most likely 0 */
if (GST_MIXER_TRACK_HAS_FLAG (track, GST_MIXER_TRACK_MUTE) && !s->mc->mute) {
volumes[0] = s->volumes[0];
if (track->num_channels == 2)
volumes[1] = s->volumes[1];
return TRUE;
}
if (!gst_oss4_mixer_get_control_val (s->mixer, s->mc, &v))
return FALSE;
gst_oss4_mixer_slider_unpack_volume (s, v, volumes);
if (track->num_channels > 1) {
GST_LOG_OBJECT (s, "volume: left=%d, right=%d", volumes[0], volumes[1]);
} else {
GST_LOG_OBJECT (s, "volume: mono=%d", volumes[0]);
}
return TRUE;
}
gboolean
gst_oss4_mixer_slider_set_volume (GstOss4MixerSlider * s, const gint * volumes)
{
GstMixerTrack *track = GST_MIXER_TRACK (s);
int val = 0;
/* if we're supposed to be muted, and are 'simulating' the mute because
* we don't have a mute control, don't actually change the volume, just
* save it as the new desired volume for later when we get unmuted again */
if (!GST_MIXER_TRACK_HAS_FLAG (track, GST_MIXER_TRACK_NO_MUTE)) {
if (GST_MIXER_TRACK_HAS_FLAG (track, GST_MIXER_TRACK_MUTE) && !s->mc->mute)
goto done;
}
val = gst_oss4_mixer_slider_pack_volume (s, volumes);
if (track->num_channels > 1) {
GST_LOG_OBJECT (s, "left=%d, right=%d", volumes[0], volumes[1]);
} else {
GST_LOG_OBJECT (s, "mono=%d", volumes[0]);
}
if (!gst_oss4_mixer_set_control_val (s->mixer, s->mc, val))
return FALSE;
done:
s->volumes[0] = volumes[0];
if (track->num_channels == 2)
s->volumes[1] = volumes[1];
return TRUE;
}
gboolean
gst_oss4_mixer_slider_set_record (GstOss4MixerSlider * s, gboolean record)
{
/* There doesn't seem to be a way to do this using the OSS4 mixer API, so
* just do nothing here for now. */
return FALSE;
}
gboolean
gst_oss4_mixer_slider_set_mute (GstOss4MixerSlider * s, gboolean mute)
{
GstMixerTrack *track = GST_MIXER_TRACK (s);
gboolean ret;
/* if the control does not support muting, then do not do anything */
if (GST_MIXER_TRACK_HAS_FLAG (track, GST_MIXER_TRACK_NO_MUTE)) {
return TRUE;
}
/* If we do not have a mute control, simulate mute (which is a bit broken,
* since we can not differentiate between capture/playback volume etc., so
* we just assume that setting the volume to 0 would be the same as muting
* this control) */
if (s->mc->mute == NULL) {
int volume;
if (mute) {
/* make sure the current volume values get saved. */
gst_oss4_mixer_slider_get_volume (s, s->volumes);
volume = 0;
} else {
volume = gst_oss4_mixer_slider_pack_volume (s, s->volumes);
}
ret = gst_oss4_mixer_set_control_val (s->mixer, s->mc, volume);
} else {
ret = gst_oss4_mixer_set_control_val (s->mixer, s->mc->mute, !!mute);
}
if (mute) {
track->flags |= GST_MIXER_TRACK_MUTE;
} else {
track->flags &= ~GST_MIXER_TRACK_MUTE;
}
return FALSE;
}
GstMixerTrack *
gst_oss4_mixer_slider_new (GstOss4Mixer * mixer, GstOss4MixerControl * mc)
{
GstOss4MixerSlider *s;
GstMixerTrack *track;
gint volumes[2] = { 0, };
s = g_object_new (GST_TYPE_OSS4_MIXER_SLIDER, "untranslated-label",
mc->mixext.extname, NULL);
track = GST_MIXER_TRACK (s);
/* caller will set track->label and track->flags */
s->mc = mc;
s->mixer = mixer;
/* we don't do value scaling but just present a scale of 0-maxvalue */
track->min_volume = 0;
track->max_volume = mc->mixext.maxvalue;
switch (mc->mixext.type) {
case MIXT_MONOSLIDER:
case MIXT_MONOSLIDER16:
case MIXT_SLIDER:
track->num_channels = 1;
break;
case MIXT_STEREOSLIDER:
case MIXT_STEREOSLIDER16:
track->num_channels = 2;
break;
default:
g_return_val_if_reached (NULL);
}
GST_LOG_OBJECT (track, "min=%d, max=%d, channels=%d", track->min_volume,
track->max_volume, track->num_channels);
if (!gst_oss4_mixer_slider_get_volume (s, volumes)) {
GST_WARNING_OBJECT (track, "failed to read volume, returning NULL");
g_object_unref (track);
track = NULL;
}
return track;
}
/* This is called from the watch thread */
void
gst_oss4_mixer_slider_process_change_unlocked (GstMixerTrack * track)
{
GstOss4MixerSlider *s = GST_OSS4_MIXER_SLIDER_CAST (track);
if (s->mc->mute != NULL && s->mc->mute->changed) {
gst_mixer_mute_toggled (GST_MIXER (s->mixer), track,
!!s->mc->mute->last_val);
} else {
/* nothing to do here, since we don't/can't easily implement the record
* flag */
}
if (s->mc->changed) {
gint volumes[2] = { 0, 0 };
gst_oss4_mixer_slider_unpack_volume (s, s->mc->last_val, volumes);
/* if we 'simulate' the mute, update flag when the volume changes */
if (s->mc->mute == NULL) {
if (volumes[0] == 0 && volumes[1] == 0) {
track->flags |= GST_MIXER_TRACK_MUTE;
} else {
track->flags &= ~GST_MIXER_TRACK_MUTE;
}
}
gst_mixer_volume_changed (GST_MIXER (s->mixer), track, volumes);
}
}