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ext/alsa/gstalsamixer.c: Use snd_mixer_selem_set_{playback|capture}_volume_all() if the volume is the same for all ch...

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Original commit message from CVS:
Patch by: Bastien Nocera <hadess at hadess net>
* ext/alsa/gstalsamixer.c: (gst_alsa_mixer_get_volume),
(check_if_volumes_are_the_same), (gst_alsa_mixer_set_volume):
Use snd_mixer_selem_set_{playback|capture}_volume_all() if
the volume is the same for all channels. This works around
some problem in alsa that leaves us with inconsistent state
for some reason (#486840).
This commit is contained in:
Bastien Nocera 2008-01-07 13:59:43 +00:00 committed by Tim-Philipp Müller
parent 06b3dec499
commit 97456dac3d
2 changed files with 49 additions and 7 deletions
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11
ChangeLog
View file

@ -1,3 +1,14 @@
2008-01-07 Tim-Philipp Müller <tim at centricular dot net>
Patch by: Bastien Nocera <hadess at hadess net>
* ext/alsa/gstalsamixer.c: (gst_alsa_mixer_get_volume),
(check_if_volumes_are_the_same), (gst_alsa_mixer_set_volume):
Use snd_mixer_selem_set_{playback|capture}_volume_all() if
the volume is the same for all channels. This works around
some problem in alsa that leaves us with inconsistent state
for some reason (#486840).
2008-01-07 Tim-Philipp Müller <tim at centricular dot net>
Patch by: Jerone Young <jerone at gmail com>

45
ext/alsa/gstalsamixer.c
View file

@ -591,6 +591,22 @@ gst_alsa_mixer_get_volume (GstAlsaMixer * mixer, GstMixerTrack * track,
}
}
static gboolean
check_if_volumes_are_the_same (guint num_channels, gint * volumes)
{
guint i;
if (num_channels <= 1)
return TRUE;
for (i = 1; i < num_channels; i++) {
if (volumes[i] != volumes[0])
return FALSE;
}
return TRUE;
}
void
gst_alsa_mixer_set_volume (GstAlsaMixer * mixer, GstMixerTrack * track,
gint * volumes)
@ -610,10 +626,17 @@ gst_alsa_mixer_set_volume (GstAlsaMixer * mixer, GstMixerTrack * track,
for (i = 0; i < track->num_channels; i++)
alsa_track->volumes[i] = volumes[i];
} else {
for (i = 0; i < track->num_channels; i++) {
alsa_track->volumes[i] = volumes[i];
snd_mixer_selem_set_playback_volume (alsa_track->element, i,
volumes[i]);
if (check_if_volumes_are_the_same (track->num_channels, volumes)) {
snd_mixer_selem_set_playback_volume_all (alsa_track->element,
volumes[0]);
for (i = 0; i < track->num_channels; i++)
alsa_track->volumes[i] = volumes[0];
} else {
for (i = 0; i < track->num_channels; i++) {
alsa_track->volumes[i] = volumes[i];
snd_mixer_selem_set_playback_volume (alsa_track->element, i,
volumes[i]);
}
}
}
@ -622,9 +645,17 @@ gst_alsa_mixer_set_volume (GstAlsaMixer * mixer, GstMixerTrack * track,
/* Is emulated record flag activated? */
if (track->flags & GST_MIXER_TRACK_RECORD ||
alsa_track->alsa_flags & GST_ALSA_MIXER_TRACK_CSWITCH) {
for (i = 0; i < track->num_channels; i++) {
alsa_track->volumes[i] = volumes[i];
snd_mixer_selem_set_capture_volume (alsa_track->element, i, volumes[i]);
if (check_if_volumes_are_the_same (track->num_channels, volumes)) {
snd_mixer_selem_set_capture_volume_all (alsa_track->element,
volumes[0]);
for (i = 0; i < track->num_channels; i++)
alsa_track->volumes[i] = volumes[0];
} else {
for (i = 0; i < track->num_channels; i++) {
alsa_track->volumes[i] = volumes[i];
snd_mixer_selem_set_capture_volume (alsa_track->element, i,
volumes[i]);
}
}
} else {
for (i = 0; i < track->num_channels; i++)