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volume: gracefully handle disconnected ALSA mixers 

This should help with the previous set of patches against the ALSA
audio output.  We should have fully disconnectable/reconnectable ALSA devices
now.

git-svn-id: https://svn.musicpd.org/mpd/trunk@4365 09075e82-0dd4-0310-85a5-a0d7c8717e4f
This commit is contained in:
Eric Wong 2006-07-16 16:52:49 +00:00
parent 6b2167a444
commit ea6dc826a1
1 changed files with 36 additions and 24 deletions
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60
src/volume.c
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@ -185,6 +185,11 @@ static int changeOssVolumeLevel(FILE * fp, int change, int rel) {
#endif
#ifdef HAVE_ALSA
static void closeAlsaMixer(void) {
snd_mixer_close(volume_alsaMixerHandle);
volume_alsaMixerHandle = NULL;
}
static int prepAlsaMixer(char * card) {
int err;
snd_mixer_elem_t * elem;
@ -197,21 +202,21 @@ static int prepAlsaMixer(char * card) {
}
if((err = snd_mixer_attach(volume_alsaMixerHandle,card))<0) {
snd_mixer_close(volume_alsaMixerHandle);
closeAlsaMixer();
WARNING("problems problems attaching alsa mixer: %s\n",
snd_strerror(err));
return -1;
}
if((err = snd_mixer_selem_register(volume_alsaMixerHandle,NULL,NULL))<0) {
snd_mixer_close(volume_alsaMixerHandle);
closeAlsaMixer();
WARNING("problems snd_mixer_selem_register'ing: %s\n",
snd_strerror(err));
return -1;
}
if((err = snd_mixer_load(volume_alsaMixerHandle))<0) {
snd_mixer_close(volume_alsaMixerHandle);
closeAlsaMixer();
WARNING("problems snd_mixer_selem_register'ing: %s\n",
snd_strerror(err));
return -1;
@ -246,12 +251,33 @@ static int prepAlsaMixer(char * card) {
WARNING("can't find alsa mixer_control \"%s\"\n",controlName);
snd_mixer_close(volume_alsaMixerHandle);
closeAlsaMixer();
return -1;
}
static void closeAlsaMixer() {
snd_mixer_close(volume_alsaMixerHandle);
static int prep_alsa_get_level(long *level)
{
const char *cmd;
int err;
if (!volume_alsaMixerHandle && prepAlsaMixer(volume_mixerDevice)<0)
return -1;
if ((err = snd_mixer_handle_events(volume_alsaMixerHandle)) < 0) {
cmd = "handle_events";
goto error;
}
if((err = snd_mixer_selem_get_playback_volume(volume_alsaElem,
SND_MIXER_SCHN_FRONT_LEFT, level)) < 0) {
cmd = "selem_get_playback_volume";
goto error;
}
return 0;
error:
WARNING("problems getting alsa volume: %s (snd_mixer_%s)\n",
snd_strerror(err), cmd);
closeAlsaMixer();
return -1;
}
static int getAlsaVolumeLevel() {
@ -259,18 +285,10 @@ static int getAlsaVolumeLevel() {
long level;
long max = volume_alsaMax;
long min = volume_alsaMin;
int err;
snd_mixer_handle_events(volume_alsaMixerHandle);
if((err = snd_mixer_selem_get_playback_volume(volume_alsaElem,
SND_MIXER_SCHN_FRONT_LEFT,&level))<0) {
WARNING("problems getting alsa volume: %s\n",snd_strerror(err));
if (prep_alsa_get_level(&level) < 0)
return -1;
}
snd_mixer_selem_get_playback_volume(volume_alsaElem,
SND_MIXER_SCHN_FRONT_LEFT,&level);
ret = ((volume_alsaSet/100.0)*(max-min)+min)+0.5;
if(volume_alsaSet>0 && ret==level) {
ret = volume_alsaSet;
@ -288,15 +306,8 @@ static int changeAlsaVolumeLevel(FILE * fp, int change, int rel) {
long min = volume_alsaMin;
int err;
snd_mixer_handle_events(volume_alsaMixerHandle);
if((err = snd_mixer_selem_get_playback_volume(volume_alsaElem,
SND_MIXER_SCHN_FRONT_LEFT,&level))<0) {
commandError(fp, ACK_ERROR_SYSTEM, "problems getting volume",
NULL);
WARNING("problems getting alsa volume: %s\n",snd_strerror(err));
if (prep_alsa_get_level(&level) < 0)
return -1;
}
if (rel) {
test = ((volume_alsaSet/100.0)*(max-min)+min)+0.5;
@ -322,6 +333,7 @@ static int changeAlsaVolumeLevel(FILE * fp, int change, int rel) {
commandError(fp, ACK_ERROR_SYSTEM, "problems setting volume",
NULL);
WARNING("problems setting alsa volume: %s\n",snd_strerror(err));
closeAlsaMixer();
return -1;
}