From fe86d58ed8e6f8e2c19cd8ba3c0fdb391716e596 Mon Sep 17 00:00:00 2001
From: Klaus Schmidinger <vdr@tvdr.de>
Date: Sat, 16 Oct 2004 14:39:45 +0200
Subject: Made volume control more linear

---
 dvbdevice.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'dvbdevice.c')

diff --git a/dvbdevice.c b/dvbdevice.c
index 45e32b28..6bee3edc 100644
--- a/dvbdevice.c
+++ b/dvbdevice.c
@@ -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));
      }
 }
-- 
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