Mixer interface broken on FreeBSD 14

[outpaddling]

FreeBSD 14 changes the API for the mixer utility, now reporting speaker volume, etc. as a fraction rather than a percent, e.g.

Old:

FreeBSD moray.acadix  bacon ~ 1006: mixer vol
vol.volume=70:70
vol.mute=0

New:

FreeBSD moray.acadix  bacon ~ 1006: mixer vol
vol.volume=0.70:0.70
vol.mute=0

I'm looking into it myself, so no action necessary at this time, unless someone wants to help. We'll need to check the FreeBSD version within the code, or selectively patch the code in the FreeBSD port framework.

Mainly just want to document the issue here.

[outpaddling]

Below is a heavily commented patch against 1.6.2 that fixes the issue. It's very simple, but the same patch to read the mixer volume has to be applied in 3 places, and the patch for setting mixer volume in 2 places. That code should probably be factored out to separate functions.

Let me know if you need any more input from me before importing the changes. I've added this to the FreeBSD port, which will be committed shortly pending poudriere testing.

--- libLumina/LuminaOS-FreeBSD.cpp.orig 2021-12-26 02:33:45 UTC
+++ libLumina/LuminaOS-FreeBSD.cpp
@@ -9,6 +9,8 @@
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/sysctl.h>
+#include <sys/param.h> // __FreeBSD_version
 
 #include <QDebug>
 //can't read xbrightness settings - assume invalid until set
@@ -171,10 +173,29 @@ int LOS::audioVolume(){ //Returns: audio volume as a p
      audiovolume = out;
   }else{
     //probe the system for the current volume (other utils could be changing it)
+    // mixer interface changed in FreeBSD 14
+    // 13 and prior: mixer -S vol outputs
+    // vol:50:50
+    // 14 and later, there is no -S flag, and vol is a fraction, not a %
+    // mixer -o vol outputs
+    // vol.volume=0.75:0.75
+    //      vol.mute=0
+    // Might be better to use the mixer API instead
+#if __FreeBSD_version < 1400000
       QString info = LUtils::getCmdOutput("mixer -S vol").join(":").simplified(); //ignores any other lines
       if(!info.isEmpty()){
         int L = info.section(":",1,1).toInt();
         int R = info.section(":",2,2).toInt();
+#else
+      // Produce something like vol.volume=0.26:0.26=vol.mute=0=
+      // Multiple lines are joined, separated by '='
+      QString info = LUtils::getCmdOutput("mixer -o vol").join("=").simplified();
+      if(!info.isEmpty()){
+        int L = info.section(QRegularExpression("[=:]"),1,1).toDouble() * 100.0;
+        int R = info.section(QRegularExpression("[=:]"),2,2).toDouble() * 100.0;
+#endif
+
+
         if(L>R){ out = L; }
         else{ out = R; }
        if(out != audiovolume){
@@ -195,10 +216,27 @@ void LOS::setAudioVolume(int percent){
   if(remoteSession){
     LUtils::runCmd(QString("pactl set-sink-volume @DEFAULT_SINK@ ")+QString::number(percent)+"%");
   }else{
-    QString info = LUtils::getCmdOutput("mixer -S vol").join(":").simplified(); //ignores any other lines
-    if(!info.isEmpty()){
-      int L = info.section(":",1,1).toInt();
-      int R = info.section(":",2,2).toInt();
+    // mixer interface changed in FreeBSD 14
+    // 13 and prior: mixer -S vol outputs
+    // vol:50:50
+    // 14 and later, there is no -S flag, and vol is a fraction, not a %
+    // mixer -o vol outputs
+    // vol.volume=0.75:0.75
+    //      vol.mute=0
+    // Might be better to use the mixer API instead
+#if __FreeBSD_version < 1400000
+      QString info = LUtils::getCmdOutput("mixer -S vol").join(":").simplified(); //ignores any other lines
+      if(!info.isEmpty()){
+        int L = info.section(":",1,1).toInt();
+        int R = info.section(":",2,2).toInt();
+#else
+      // Produce something like vol.volume=0.26:0.26=vol.mute=0=
+      // Multiple lines are joined, separated by '='
+      QString info = LUtils::getCmdOutput("mixer -o vol").join("=").simplified();
+      if(!info.isEmpty()){
+        int L = info.section(QRegularExpression("[=:]"),1,1).toDouble() * 100.0;
+        int R = info.section(QRegularExpression("[=:]"),2,2).toDouble() * 100.0;
+#endif
       int diff = L-R;
       if((percent == L) && (L==R)){ return; } //already set to that volume
       if(diff<0){ R=percent; L=percent+diff; } //R Greater
@@ -207,7 +245,11 @@ void LOS::setAudioVolume(int percent){
       if(L<0){L=0;}else if(L>100){L=100;}
       if(R<0){R=0;}else if(R>100){R=100;}
       //Run Command
+#if __FreeBSD_version < 1400000
       LUtils::runCmd("mixer vol "+QString::number(L)+":"+QString::number(R));
+#else
+      LUtils::runCmd("mixer vol="+QString::number(L/100.0)+":"+QString::number(R/100.0));
+#endif
     }
   }
   audiovolume = percent; //save for checking later
@@ -220,15 +262,36 @@ void LOS::changeAudioVolume(int percentdiff){
   if(remoteSession){
     LUtils::runCmd(QString("pactl set-sink-volume @DEFAULT_SINK@ ")+((percentdiff>0)?"+" : "") + QString::number(percentdiff)+"%");
   }else{
-    QString info = LUtils::getCmdOutput("mixer -S vol").join(":").simplified(); //ignores any other lines
-    if(!info.isEmpty()){
-      int L = info.section(":",1,1).toInt() + percentdiff;
-      int R = info.section(":",2,2).toInt() + percentdiff;
+    // mixer interface changed in FreeBSD 14
+    // 13 and prior: mixer -S vol outputs
+    // vol:50:50
+    // 14 and later, there is no -S flag, and vol is a fraction, not a %
+    // mixer -o vol outputs
+    // vol.volume=0.75:0.75
+    //      vol.mute=0
+    // Might be better to use the mixer API instead
+#if __FreeBSD_version < 1400000
+      QString info = LUtils::getCmdOutput("mixer -S vol").join(":").simplified(); //ignores any other lines
+      if(!info.isEmpty()){
+        int L = info.section(":",1,1).toInt();
+        int R = info.section(":",2,2).toInt();
+#else
+      // Produce something like vol.volume=0.26:0.26=vol.mute=0=
+      // Multiple lines are joined, separated by '='
+      QString info = LUtils::getCmdOutput("mixer -o vol").join("=").simplified();
+      if(!info.isEmpty()){
+        int L = info.section(QRegularExpression("[=:]"),1,1).toDouble() * 100.0;
+        int R = info.section(QRegularExpression("[=:]"),2,2).toDouble() * 100.0;
+#endif
       //Check bounds
       if(L<0){L=0;}else if(L>100){L=100;}
       if(R<0){R=0;}else if(R>100){R=100;}
       //Run Command
+#if __FreeBSD_version < 1400000
       LUtils::runCmd("mixer vol "+QString::number(L)+":"+QString::number(R));
+#else
+      LUtils::runCmd("mixer vol="+QString::number(L/100.0)+":"+QString::number(R/100.0));
+#endif
     }
   }
 }