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Implement volume setting functionality, 

original patch by Nguyen Kim <nguyenk@ie2.u-psud.fr>.
Note that volume changing never worked on my system with NAS, but
that seems to be a nasd problem which I did not try to track down yet...


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@8273 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
ranma 2002-11-24 23:13:15 +00:00
parent fe4ceedf5f
commit 422acb829c
1 changed files with 47 additions and 2 deletions
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49
libao2/ao_nas.c
View File

@ -333,8 +333,53 @@ static unsigned int nas_aformat_to_auformat(unsigned int *format)
}
// to set/get/query special features/parameters
static int control(int cmd,int arg){
return -1;
static int control(int cmd, int arg)
{
AuDeviceAttributes *dattr;
AuFixedPoint fpgain;
AuStatus as;
int gain;
ao_control_vol_t *vol = (ao_control_vol_t *)arg;
dattr = AuGetDeviceAttributes(nas_data->aud, nas_data->dev, &as);
if (as != AuSuccess) {
nas_print_error(nas_data->aud,
"control(): AuGetDeviceAttributes", as);
return CONTROL_ERROR;
}
gain = AuFixedPointRoundDown(AuDeviceGain(dattr));
// kn: 0 <= gain <= 100
switch (cmd) {
case AOCONTROL_GET_VOLUME:
vol->right = (float) gain;
vol->left = vol->right;
return CONTROL_OK;
case AOCONTROL_SET_VOLUME:
/*
* kn: we should have vol->left == vol->right but i don't
* know if something can change it outside of ao_nas
* so i take the mean of both values.
*/
gain = (int) ((vol->left+vol->right)/2);
fpgain = AuFixedPointFromSum(gain, 0);
AuDeviceGain(dattr) = fpgain;
AuSetDeviceAttributes(nas_data->aud, nas_data->dev,
AuCompDeviceGainMask, dattr, &as);
if (as != AuSuccess) {
nas_print_error(nas_data->aud,
"control(): AuSetDeviceAttributes", as);
return CONTROL_ERROR;
}
return CONTROL_OK;
default:
return CONTROL_UNKNOWN;
};
}
// open & setup audio device