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Code Issues Releases Wiki Activity

Made volume control more linear

This commit is contained in:
Klaus Schmidinger 2004-10-16 14:39:45 +02:00
parent 7ba6dae69f
commit fe86d58ed8
3 changed files with 8 additions and 2 deletions
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1
CONTRIBUTORS
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@ -630,6 +630,7 @@ Emil Naepflein <Emil.Naepflein@philosys.de>
for fixing selecting the device, because sometimes an FTA recording terminated a
CA recording
for suggesting to never delete edited recordings automatically if the disk runs full
for making volume control more linear
Gerald Berwolf <genka@genka.de>
for suggesting to deactivate some templates in tools.h in case some plugin needs to

1
HISTORY
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@ -3022,3 +3022,4 @@ Video Disk Recorder Revision History
- Avoiding unnecessary section filter start/stops (thanks to Marco Schlüßler).
- Made the "Channel not available!" message and mtInfo instead of mtError (suggested
by Wayne Keer).
- Made volume control more linear (thanks to Emil Naepflein).

8
dvbdevice.c
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: dvbdevice.c 1.95 2004/10/16 12:51:56 kls Exp $
* $Id: dvbdevice.c 1.96 2004/10/16 14:38:24 kls Exp $
*/
#include "dvbdevice.h"
@ -785,7 +785,11 @@ void cDvbDevice::SetVolumeDevice(int Volume)
{
if (HasDecoder()) {
audio_mixer_t am;
am.volume_left = am.volume_right = Volume;
// conversion for linear volume response:
int i, Vol;
for (i = 1, Vol = 0; i < Volume; i++)
Vol += (256 - i) * (256 - i);
am.volume_left = am.volume_right = Vol / 21718;
CHECK(ioctl(fd_audio, AUDIO_SET_MIXER, &am));
}
}