Add an option for setting the max number of sources

Alc/ALc.c

@@ -1156,7 +1156,9 @@ ALCAPI ALCdevice* ALCAPIENTRY alcOpenDevice(const ALCchar *deviceName)
         if((ALint)device->UpdateFreq <= 0)
             device->UpdateFreq = 8192;
 
-        device->MaxNoOfSources = 256;
+        device->MaxNoOfSources = GetConfigValueInt(NULL, "sources", 256);
+        if((ALint)device->MaxNoOfSources <= 0)
+            device->MaxNoOfSources = 256;
 
         // Find a playback device to open
         for(i = 0;BackendList[i].Init;i++)

alsoftrc.sample

@@ -40,6 +40,10 @@ frequency = 44100  # Sets the output frequency. Default is 44100
 refresh = 8192  # Sets the buffer size, in frames. Default is 8192. Note that
                 # the actual granularity may or may not be less than this.
 
+sources = 256  # Sets the maximum number of allocatable sources. Lower values
+               # may help for systems with apps that try to play more sounds
+               # than the CPU can handle. Default is 256
+
 drivers =  # Sets the backend driver list order, comma-seperated. Unknown
            # backends and duplicated names are ignored, and unlisted backends
            # won't be considered for use. An empty list means the default.