int AmeSystemSound::setupMixer(QString card, QString device)
{
char *name;
long int a, b;
long alsa_min_vol = 0, alsa_max_vol = 100;
int err, index;
mixer_element = 0;
qDebug("AmeSystemSound::SoundOutput: setupMixer()");
if ((err = getMixer(&mixer, card)) < 0)
return err;
parseMixerName(device.toAscii().data(), &name, &index);
mixer_element = getMixerElem(mixer, name, index);
free(name);
if (!mixer_element)
{
qWarning("SoundOutput: Failed to find mixer element");
return -1;
}
/* This hack was copied from xmms.
* Work around a bug in alsa-lib up to 1.0.0rc2 where the
* new range don't take effect until the volume is changed.
* This hack should be removed once we depend on Alsa 1.0.0.
*/
snd_mixer_selem_get_playback_volume(mixer_element, SND_MIXER_SCHN_FRONT_LEFT, &a);
snd_mixer_selem_get_playback_volume(mixer_element, SND_MIXER_SCHN_FRONT_RIGHT, &b);
snd_mixer_selem_get_playback_volume_range(mixer_element,
&alsa_min_vol, &alsa_max_vol);
snd_mixer_selem_set_playback_volume_range(mixer_element, 0, 100);
if (alsa_max_vol == 0)
{
mixer_element = NULL;
return -1;
}
setVolume(a * 100 / alsa_max_vol);
qDebug("SoundOutput: setupMixer() success");
return 0;
}
int VolumeALSA::setupMixer(QString card, QString device)
{
char *name;
int err, index;
pcm_element = 0;
qDebug("OutputALSA: setupMixer()");
if ((err = getMixer(&m_mixer, card)) < 0)
return err;
parseMixerName(device.toAscii().data(), &name, &index);
pcm_element = getMixerElem(m_mixer, name, index);
free(name);
if (!pcm_element)
{
qWarning("OutputALSA: Failed to find mixer element");
return -1;
}
if((err = snd_mixer_selem_set_playback_volume_range(pcm_element, 0, 100)) < 0)
{
qWarning("OutputALSA: Unable to set volume range: %s", snd_strerror(-err));
pcm_element = NULL;
return -1;
}
// setup socket notifiers to monitor the state changes of the mixer
int n = snd_mixer_poll_descriptors_count(m_mixer);
if(n > 0)
{
struct pollfd* fds = new struct pollfd[n];
n = snd_mixer_poll_descriptors(m_mixer, fds, n);
for(int i = 0; i < n; ++i)
{
int sock = fds[i].fd;
QSocketNotifier* sn = new QSocketNotifier(sock, QSocketNotifier::Read, this);
connect(sn, SIGNAL(activated(int)), SIGNAL(changed()));
}
delete []fds;
}
qDebug("OutputALSA: setupMixer() success");
return 0;
}
