Misc audio fixes (#1348)

Changes:

    Implement software surround downmixing (fix #796).
    Fix a crash when no audio renderer were created when stopping emulation.

NOTE: This PR also disable support of 5.1 surround on the OpenAL backend as we cannot detect if the hardware directly support it. (the downmixing applied by OpenAL on Windows is terribly slow)

1 files changed, 7 insertions, 1 deletions

diff --git a/Ryujinx.Audio/Renderers/OpenAL/OpenALAudioTrack.cs b/Ryujinx.Audio/Renderers/OpenAL/OpenALAudioTrack.cs
index 8629dc96..2f150998 100644
--- a/Ryujinx.Audio/Renderers/OpenAL/OpenALAudioTrack.cs
+++ b/Ryujinx.Audio/Renderers/OpenAL/OpenALAudioTrack.cs
@@ -12,6 +12,9 @@ namespace Ryujinx.Audio
         public ALFormat      Format     { get; private set; }
         public PlaybackState State      { get; set; }
 
+        public int HardwareChannels { get; }
+        public int VirtualChannels { get; }
+
         private ReleaseCallback _callback;
 
         private ConcurrentDictionary<long, int> _buffers;
@@ -21,13 +24,16 @@ namespace Ryujinx.Audio
 
         private bool _disposed;
 
-        public OpenALAudioTrack(int sampleRate, ALFormat format, ReleaseCallback callback)
+        public OpenALAudioTrack(int sampleRate, ALFormat format, int hardwareChannels, int virtualChannels, ReleaseCallback callback)
         {
             SampleRate = sampleRate;
             Format     = format;
             State      = PlaybackState.Stopped;
             SourceId   = AL.GenSource();
 
+            HardwareChannels = hardwareChannels;
+            VirtualChannels = virtualChannels;
+
             _callback = callback;
 
             _buffers = new ConcurrentDictionary<long, int>();