--- a/dom/media/platforms/apple/AppleATDecoder.cpp
+++ b/dom/media/platforms/apple/AppleATDecoder.cpp
@@ -322,23 +322,26 @@ AppleATDecoder::DecodeSample(MediaRawDat
     }
     mAudioConverter = MakeUnique<AudioConverter>(in, out);
   }
   if (mAudioConverter) {
     MOZ_ASSERT(mAudioConverter->CanWorkInPlace());
     data = mAudioConverter->Process(Move(data));
   }
 
-  RefPtr<AudioData> audio = new AudioData(aSample->mOffset,
-                                          aSample->mTime,
-                                          duration,
-                                          numFrames,
-                                          data.Forget(),
-                                          channels,
-                                          rate);
+  RefPtr<AudioData> audio =
+    new AudioData(aSample->mOffset,
+                  aSample->mTime,
+                  duration,
+                  numFrames,
+                  data.Forget(),
+                  channels,
+                  rate,
+                  mChannelLayout ? mChannelLayout->Map()
+                                 : AudioConfig::ChannelLayout::UNKNOWN_MAP);
   mDecodedSamples.AppendElement(Move(audio));
   return NS_OK;
 }
 
 MediaResult
 AppleATDecoder::GetInputAudioDescription(AudioStreamBasicDescription& aDesc,
                                          const nsTArray<uint8_t>& aExtraData)
 {