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Code Issues Releases Wiki Activity

Refined formula for making volume control more linear

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This commit is contained in:
Klaus Schmidinger 2004-10-17 09:12:16 +02:00
parent 9f18dbc8cf
commit 1f726846f5
3 changed files with 6 additions and 6 deletions
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3
CONTRIBUTORS
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@ -1092,3 +1092,6 @@ Arthur Konovalov <kasjas@hot.ee>
Milos Kapoun <m.kapoun@cra.cz> Milos Kapoun <m.kapoun@cra.cz>
for suggesting to skip code table info in SI data for suggesting to skip code table info in SI data
for adding missing Czech characters to fontosd-iso8859-2.c for adding missing Czech characters to fontosd-iso8859-2.c
Udo Richter <udo_richter@gmx.de>
for refining the formula for making volume control more linear

2
HISTORY
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@ -3022,7 +3022,7 @@ Video Disk Recorder Revision History
- Avoiding unnecessary section filter start/stops (thanks to Marco Schlüßler). - Avoiding unnecessary section filter start/stops (thanks to Marco Schlüßler).
- Made the "Channel not available!" message and mtInfo instead of mtError (suggested - Made the "Channel not available!" message and mtInfo instead of mtError (suggested
by Wayne Keer). by Wayne Keer).
- Made volume control more linear (thanks to Emil Naepflein). - Made volume control more linear (thanks to Emil Naepflein and Udo Richter).
- Now skipping code table info in SI data (suggested by Milos Kapoun). - Now skipping code table info in SI data (suggested by Milos Kapoun).
- Added missing Czech characters to fontosd-iso8859-2.c (thanks to Milos Kapoun). - Added missing Czech characters to fontosd-iso8859-2.c (thanks to Milos Kapoun).
- Fixed a crash in the time search mechanism (reported by Reinhard Nissl). - Fixed a crash in the time search mechanism (reported by Reinhard Nissl).

7
dvbdevice.c
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and * See the main source file 'vdr.c' for copyright information and
* how to reach the author. * how to reach the author.
* *
* $Id: dvbdevice.c 1.96 2004/10/16 14:38:24 kls Exp $ * $Id: dvbdevice.c 1.97 2004/10/17 09:10:43 kls Exp $
*/ */
#include "dvbdevice.h" #include "dvbdevice.h"
@ -786,10 +786,7 @@ void cDvbDevice::SetVolumeDevice(int Volume)
if (HasDecoder()) { if (HasDecoder()) {
audio_mixer_t am; audio_mixer_t am;
// conversion for linear volume response: // conversion for linear volume response:
int i, Vol; am.volume_left = am.volume_right = 2 * Volume - Volume * Volume / 255;
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)); CHECK(ioctl(fd_audio, AUDIO_SET_MIXER, &am));
} }
} }