From e2f2ca1cbb6fc68f67a2bcd3c76237be77f3e04e Mon Sep 17 00:00:00 2001
From: reimar <reimar@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Sun, 14 Nov 2004 11:27:58 +0000
Subject: [PATCH] allow forcing of software volume control and setting maximum
 amplification.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@13934 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 DOCS/man/en/mplayer.1 | 12 ++++++++++++
 cfg-mplayer.h         |  3 +++
 mixer.c               | 20 +++++++++++---------
 mixer.h               |  2 ++
 4 files changed, 28 insertions(+), 9 deletions(-)

diff --git a/DOCS/man/en/mplayer.1 b/DOCS/man/en/mplayer.1
index 35ac530d9d..b05ad14154 100644
--- a/DOCS/man/en/mplayer.1
+++ b/DOCS/man/en/mplayer.1
@@ -1738,6 +1738,18 @@ ALSA mixer channel names followed by a number must be specified in the
 <name,number> format, i.e.\& a channel labeled 'PCM 1' in alsamixer must
 be converted to
 .BR PCM,1 .
+.TP
+.B \-softvol
+Force the use of the software mixer, instead of using the soundcard
+mixer.
+.
+.TP
+.B \-softvol-max <10.0\-10000.0>
+Set the maximum amplification level in percent (default: 110).
+A value of 200 will allow you to adjust the volume up to a maximum of
+double the current level.
+With values below 100 the starting volume (which is 100%) will be above
+the maximum, which e.g. the OSD cannot display correctly.
 .
 .TP
 .B \-nowaveheader (\-ao pcm only)
diff --git a/cfg-mplayer.h b/cfg-mplayer.h
index 53ec4e0d1a..5eb10c4922 100644
--- a/cfg-mplayer.h
+++ b/cfg-mplayer.h
@@ -174,6 +174,9 @@ m_option_t mplayer_opts[]={
 	{"dsp", "Use -ao oss:dsp_path.\n", CONF_TYPE_PRINT, CONF_NOCFG, 0, 0, NULL},
         {"mixer", &mixer_device, CONF_TYPE_STRING, 0, 0, 0, NULL},
         {"mixer-channel", &mixer_channel, CONF_TYPE_STRING, 0, 0, 0, NULL},
+        {"softvol", &soft_vol, CONF_TYPE_FLAG, 0, 0, 1, NULL},
+        {"nosoftvol", &soft_vol, CONF_TYPE_FLAG, 0, 1, 0, NULL},
+        {"softvol-max", &soft_vol_max, CONF_TYPE_FLOAT, CONF_RANGE, 10, 10000, NULL},
 	{"volstep", &volstep, CONF_TYPE_INT, CONF_RANGE, 0, 100, NULL},
 	{"master", "Option -master has been removed, use -aop list=volume instead.\n", CONF_TYPE_PRINT, 0, 0, 0, NULL},
 	// override audio buffer size (used only by -ao oss, anyway obsolete...)
diff --git a/mixer.c b/mixer.c
index 388aadb2b3..f3de6cdeb7 100644
--- a/mixer.c
+++ b/mixer.c
@@ -15,13 +15,16 @@
 
 char * mixer_device=NULL;
 char * mixer_channel=NULL;
+int soft_vol = 0;
+float soft_vol_max = 110.0;
 
 void mixer_getvolume(mixer_t *mixer, float *l, float *r)
 {
   ao_control_vol_t vol;
   *l=0; *r=0;
   if(mixer->audio_out){
-    if(CONTROL_OK != mixer->audio_out->control(AOCONTROL_GET_VOLUME,&vol)) {
+    if(soft_vol ||
+        CONTROL_OK != mixer->audio_out->control(AOCONTROL_GET_VOLUME,&vol)) {
       if (!mixer->afilter)
         return;
       else {
@@ -31,8 +34,8 @@ void mixer_getvolume(mixer_t *mixer, float *l, float *r)
           db_vals[0] = db_vals[1] = 1.0;
         else
         af_from_dB (2, db_vals, db_vals, 20.0, -200.0, 60.0);
-        vol.left = db_vals[0] * 90.0;
-        vol.right = db_vals[1] * 90.0;
+        vol.left = (db_vals[0] / (soft_vol_max / 100.0)) * 100.0;
+        vol.right = (db_vals[1] / (soft_vol_max / 100.0)) * 100.0;
       }
     }
     *r=vol.right;
@@ -45,19 +48,18 @@ void mixer_setvolume(mixer_t *mixer, float l, float r)
   ao_control_vol_t vol;
   vol.right=r; vol.left=l;
   if(mixer->audio_out){
-    if(CONTROL_OK != mixer->audio_out->control(AOCONTROL_SET_VOLUME,&vol)) {
+    if(soft_vol ||
+        CONTROL_OK != mixer->audio_out->control(AOCONTROL_SET_VOLUME,&vol)) {
       if (!mixer->afilter)
         return;
       else {
         // af_volume uses values in dB
         float db_vals[AF_NCH];
         int i;
-        // a volume of 90% will give 0 dB (no change)
-        // like this, amplification is possible as well
-        db_vals[0] = l / 90.0;
-        db_vals[1] = r / 90.0;
+        db_vals[0] = (l / 100.0) * (soft_vol_max / 100.0);
+        db_vals[1] = (r / 100.0) * (soft_vol_max / 100.0);
         for (i = 2; i < AF_NCH; i++) {
-          db_vals[i] = (l + r) / 180.0;
+          db_vals[i] = ((l + r) / 100.0) * (soft_vol_max / 100.0) / 2.0;
         }
         af_to_dB (AF_NCH, db_vals, db_vals, 20.0);
         if (!af_control_any_rev(mixer->afilter,
diff --git a/mixer.h b/mixer.h
index 6c8bfdcc2a..26a9be18bd 100644
--- a/mixer.h
+++ b/mixer.h
@@ -6,6 +6,8 @@
 
 extern char * mixer_device;
 extern char * mixer_channel;
+extern int soft_vol;
+extern float soft_vol_max;
 
 typedef struct mixer_s {
     ao_functions_t *audio_out;