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From: Jacob Moody <jsmoody@iastate.edu>
To: 9front@9front.org
Subject: [drawterm] windows devaudio volume control
Date: Wed, 19 Jun 2019 10:12:08 -0500	[thread overview]
Message-ID: <CA+gzr0KrLd=5wVkfrt+zin0FXBK8FN3yYD_iOBwkNe9ayOCbOQ@mail.gmail.com> (raw)

All,

I worked on a quick patch for drawterm devaudio-win32.c to allow for
setting the application volume.

diff -r 5c953ddd29fa kern/devaudio-win32.c
--- a/kern/devaudio-win32.c    Sat Mar 09 20:51:48 2019 +0100
+++ b/kern/devaudio-win32.c    Wed Jun 19 10:07:37 2019 -0500
@@ -52,19 +52,24 @@
 void
 audiodevsetvol(int what, int left, int right)
 {
-    USED(what);
-    USED(left);
-    USED(right);
-    error("not supported");
+    DWORD v;
+
+    //Windows uses a 0-255 scale, plan9 uses 0-100
+    v = right*0xFF/100;
+    v = (v<<8)|left*0xFF/100;
+    if(waveOutSetVolume(waveout, v) != MMSYSERR_NOERROR)
+        oserror();
 }

 void
 audiodevgetvol(int what, int *left, int *right)
 {
-    USED(what);
-    USED(left);
-    USED(right);
-    error("not supported");
+    DWORD v;
+
+    if(waveOutGetVolume(waveout, &v) != MMSYSERR_NOERROR)
+        oserror();
+    *left = (v&0xFF)*100/0xFF;
+    *right = ((v>>8)&0xFF)*100/0xFF;
 }

 int


Thanks,
Moody


                 reply	other threads:[~2019-06-19 15:12 UTC|newest]

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