At least for mp3blaster, just keeping a cache of the actual audio value
we want, and invalidating it whenever something external changes the
volume is quite enough.
Index: Makefile
===================================================================
RCS file: /cvs/ports/audio/mp3blaster/Makefile,v
retrieving revision 1.7
diff -u -p -r1.7 Makefile
--- Makefile 24 Jan 2005 17:51:36 -0000 1.7
+++ Makefile 11 Aug 2005 21:20:14 -0000
@@ -3,7 +3,7 @@
COMMENT= "text console audio player with an interactive interface"
DISTNAME= mp3blaster-3.2.0
-PKGNAME= ${DISTNAME}p0
+PKGNAME= ${DISTNAME}p1
CATEGORIES= audio
HOMEPAGE= http://www.stack.nl/~brama/mp3blaster/
Index: patches/patch-nmixer_nmixer_h
===================================================================
RCS file: patches/patch-nmixer_nmixer_h
diff -N patches/patch-nmixer_nmixer_h
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ patches/patch-nmixer_nmixer_h 11 Aug 2005 21:20:14 -0000
@@ -0,0 +1,12 @@
+$OpenBSD$
+--- nmixer/nmixer.h.orig Thu Aug 11 23:14:07 2005
++++ nmixer/nmixer.h Thu Aug 11 23:16:05 2005
+@@ -85,6 +85,8 @@ protected:
+ const char *Label(int device);
+ private:
+ int mixer;
++ struct volume cache;
++ int lastsetting;
+ };
+
+ #ifdef HAVE_NASPLAYER
Index: patches/patch-nmixer_ossmixer_cc
===================================================================
RCS file: patches/patch-nmixer_ossmixer_cc
diff -N patches/patch-nmixer_ossmixer_cc
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ patches/patch-nmixer_ossmixer_cc 11 Aug 2005 21:20:14 -0000
@@ -0,0 +1,31 @@
+$OpenBSD$
+--- nmixer/ossmixer.cc.orig Thu Aug 11 23:12:34 2005
++++ nmixer/ossmixer.cc Thu Aug 11 23:17:33 2005
+@@ -49,17 +49,24 @@ OSSMixer::~OSSMixer()
+
+ bool OSSMixer::Set(int device, struct volume *vol)
+ {
++ cache = *vol;
+ int setting = (vol->left & 0xFF) + ((vol->right & 0xFF) << 8);
+- return (ioctl(mixer, MIXER_WRITE(device), &setting) >= 0);
++ if (ioctl(mixer, MIXER_WRITE(device), &setting) >= 0)
++ return ioctl(mixer, MIXER_READ(device), &lastsetting) >= 0;
+ }
+
+ bool OSSMixer::Get(int device, struct volume *vol)
+ {
+ int setting;
++
+ if (ioctl(mixer, MIXER_READ(device), &setting) < 0)
+ return false;
+- vol->left = setting & 0x00FF;
+- vol->right = (setting & 0xFF00) >> 8;
++ if (setting == lastsetting)
++ *vol = cache;
++ else {
++ vol->left = setting & 0x00FF;
++ vol->right = (setting & 0xFF00) >> 8;
++ }
+ return true;
+ }
+
