CoreAE: mixerunits input is the inputunits output

Not this still doesn't resolve all issues. We are still not
setting up a correct channel map for the output

xbmc/cores/AudioEngine/Engines/CoreAudio/CoreAudioGraph.cpp

@@ -154,9 +154,10 @@ bool CCoreAudioGraph::Open(ICoreAudioSource *pSource, AEAudioFormat &format,
 
       // Update format structure to reflect the desired format from the mixer
       // The output format of the mixer is identical to the input format, except for the channel count
-      fmt.mChannelsPerFrame = m_mixMap->GetOutputChannels();
+      AudioStreamBasicDescription mixOutput(fmt);
+      mixOutput.mChannelsPerFrame = m_mixMap->GetOutputChannels();
 
-      if (!m_mixerUnit->SetFormat(&fmt, kAudioUnitScope_Output, kOutputBus))
+      if (!m_mixerUnit->SetFormat(&mixOutput, kAudioUnitScope_Output, kOutputBus))
         return false;
 
       ret =  AUGraphConnectNodeInput(m_audioGraph, m_mixerUnit->GetNode(), 0, m_audioUnit->GetNode(), 0);
@@ -199,11 +200,11 @@ bool CCoreAudioGraph::Open(ICoreAudioSource *pSource, AEAudioFormat &format,
 
       UInt32 inputNumber = m_inputUnit->GetBus();
       int channelOffset = GetMixerChannelOffset(inputNumber);
-      if (!CCoreAudioMixMap::SetMixingMatrix(m_mixerUnit, m_mixMap, &inputFormat, &fmt, channelOffset))
+      if (!CCoreAudioMixMap::SetMixingMatrix(m_mixerUnit, m_mixMap, &fmt, &mixOutput, channelOffset))
         return false;
 
       // Regenerate audio format and copy format for the Output AU
-      outputFormat = fmt;
+      outputFormat = mixOutput;
     }
     else
     {