Merge pull request #2134 from drhill/dev-v2_passthroughChannelFix

fix 6.1 channel passthrough failing

library/src/main/java/com/google/android/exoplayer2/audio/AudioTrack.java

@@ -443,6 +443,19 @@ public final class AudioTrack {
       default:
       default:
         throw new IllegalArgumentException("Unsupported channel count: " + channelCount);
         throw new IllegalArgumentException("Unsupported channel count: " + channelCount);
     }
     }
+    if (Util.SDK_INT <= 23 && "foster".equals(Util.DEVICE) && "NVIDIA".equals(Util.MANUFACTURER)) {
+      switch(channelCount) {
+        case 7:
+          channelConfig = C.CHANNEL_OUT_7POINT1_SURROUND;
+          break;
+        case 3:
+        case 5:
+          channelConfig = AudioFormat.CHANNEL_OUT_5POINT1;
+          break;
+        default:
+          break;
+      }
+    }
 
 
     boolean passthrough = !MimeTypes.AUDIO_RAW.equals(mimeType);
     boolean passthrough = !MimeTypes.AUDIO_RAW.equals(mimeType);
     @C.Encoding int sourceEncoding;
     @C.Encoding int sourceEncoding;