Core Audio: Fix errors with channel mapping.

mini_al.h

@@ -1698,6 +1698,7 @@ struct mal_context
             mal_proc AudioOutputUnitStart;
             mal_proc AudioOutputUnitStop;
             mal_proc AudioUnitAddPropertyListener;
+            mal_proc AudioUnitGetPropertyInfo;
             mal_proc AudioUnitGetProperty;
             mal_proc AudioUnitSetProperty;
             mal_proc AudioUnitInitialize;
@@ -13685,6 +13686,7 @@ typedef OSStatus (* mal_AudioComponentInstanceNew_proc)(AudioComponent inCompone
 typedef OSStatus (* mal_AudioOutputUnitStart_proc)(AudioUnit inUnit);
 typedef OSStatus (* mal_AudioOutputUnitStop_proc)(AudioUnit inUnit);
 typedef OSStatus (* mal_AudioUnitAddPropertyListener_proc)(AudioUnit inUnit, AudioUnitPropertyID inID, AudioUnitPropertyListenerProc inProc, void* inProcUserData);
+typedef OSStatus (* mal_AudioUnitGetPropertyInfo_proc)(AudioUnit inUnit, AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, UInt32* outDataSize, Boolean* outWriteable);
 typedef OSStatus (* mal_AudioUnitGetProperty_proc)(AudioUnit inUnit, AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, void* outData, UInt32* ioDataSize);
 typedef OSStatus (* mal_AudioUnitSetProperty_proc)(AudioUnit inUnit, AudioUnitPropertyID inID, AudioUnitScope inScope, AudioUnitElement inElement, const void* inData, UInt32 inDataSize);
 typedef OSStatus (* mal_AudioUnitInitialize_proc)(AudioUnit inUnit);
@@ -14118,7 +14120,6 @@ mal_result mal_get_AudioObject_stream_descriptions(mal_context* pContext, AudioO
 }
 
 
-
 mal_result mal_get_AudioObject_channel_layout(mal_context* pContext, AudioObjectID deviceObjectID, mal_device_type deviceType, AudioChannelLayout** ppChannelLayout)   // NOTE: Free the returned pointer with mal_free().
 {
     mal_assert(pContext != NULL);
@@ -14262,12 +14263,45 @@ mal_result mal_get_AudioObject_channel_map(mal_context* pContext, AudioObjectID
     
     result = mal_get_channel_map_from_AudioChannelLayout(pChannelLayout, channelMap);
     if (result != MAL_SUCCESS) {
+        mal_free(pChannelLayout);
         return result;
     }
     
+    mal_free(pChannelLayout);
     return result;
 }
 
+mal_result mal_get_AudioUnit_channel_map(mal_context* pContext, AudioUnit audioUnit, mal_device_type deviceType, mal_channel channelMap[MAL_MAX_CHANNELS])
+{
+    mal_assert(pContext != NULL);
+    
+    UInt32 channelLayoutSize;
+    OSStatus status = ((mal_AudioUnitGetPropertyInfo_proc)pContext->coreaudio.AudioUnitGetPropertyInfo)(audioUnit, kAudioUnitProperty_AudioChannelLayout, kAudioUnitScope_Output, MAL_COREAUDIO_OUTPUT_BUS, &channelLayoutSize, NULL);
+    if (status != noErr) {
+        return mal_result_from_OSStatus(status);
+    }
+    
+    AudioChannelLayout* pChannelLayout = (AudioChannelLayout*)mal_malloc(channelLayoutSize);
+    if (pChannelLayout == NULL) {
+        return MAL_OUT_OF_MEMORY;
+    }
+    
+    status = ((mal_AudioUnitGetProperty_proc)pContext->coreaudio.AudioUnitGetProperty)(audioUnit, kAudioUnitProperty_AudioChannelLayout, kAudioUnitScope_Output, MAL_COREAUDIO_OUTPUT_BUS, pChannelLayout, &channelLayoutSize);
+    if (status != noErr) {
+        mal_free(pChannelLayout);
+        return mal_result_from_OSStatus(status);
+    }
+    
+    mal_result result = mal_get_channel_map_from_AudioChannelLayout(pChannelLayout, channelMap);
+    if (result != MAL_SUCCESS) {
+        mal_free(pChannelLayout);
+        return result;
+    }
+
+    mal_free(pChannelLayout);
+    return MAL_SUCCESS;
+}
+
 mal_result mal_get_AudioObject_sample_rates(mal_context* pContext, AudioObjectID deviceObjectID, mal_device_type deviceType, UInt32* pSampleRateRangesCount, AudioValueRange** ppSampleRateRanges)   // NOTE: Free the returned pointer with mal_free().
 {
     mal_assert(pContext != NULL);
@@ -15393,7 +15427,7 @@ mal_result mal_device_init_internal__coreaudio(mal_context* pContext, mal_device
     
     // Internal channel map.
 #if defined(MAL_APPLE_DESKTOP)
-    result = mal_get_AudioObject_channel_map(pContext, deviceObjectID, deviceType, pData->channelMapOut);
+    result = mal_get_AudioUnit_channel_map(pContext, pData->audioUnit, deviceType, pData->channelMapOut);
     if (result != MAL_SUCCESS) {
         return result;
     }
@@ -15759,6 +15793,7 @@ mal_result mal_context_init__coreaudio(mal_context* pContext)
     pContext->coreaudio.AudioOutputUnitStart           = mal_dlsym(pContext->coreaudio.hAudioUnit, "AudioOutputUnitStart");
     pContext->coreaudio.AudioOutputUnitStop            = mal_dlsym(pContext->coreaudio.hAudioUnit, "AudioOutputUnitStop");
     pContext->coreaudio.AudioUnitAddPropertyListener   = mal_dlsym(pContext->coreaudio.hAudioUnit, "AudioUnitAddPropertyListener");
+    pContext->coreaudio.AudioUnitGetPropertyInfo       = mal_dlsym(pContext->coreaudio.hAudioUnit, "AudioUnitGetPropertyInfo");
     pContext->coreaudio.AudioUnitGetProperty           = mal_dlsym(pContext->coreaudio.hAudioUnit, "AudioUnitGetProperty");
     pContext->coreaudio.AudioUnitSetProperty           = mal_dlsym(pContext->coreaudio.hAudioUnit, "AudioUnitSetProperty");
     pContext->coreaudio.AudioUnitInitialize            = mal_dlsym(pContext->coreaudio.hAudioUnit, "AudioUnitInitialize");
@@ -15779,6 +15814,7 @@ mal_result mal_context_init__coreaudio(mal_context* pContext)
     pContext->coreaudio.AudioOutputUnitStart           = (mal_proc)AudioOutputUnitStart;
     pContext->coreaudio.AudioOutputUnitStop            = (mal_proc)AudioOutputUnitStop;
     pContext->coreaudio.AudioUnitAddPropertyListener   = (mal_proc)AudioUnitAddPropertyListener;
+    pContext->coreaudio.AudioUnitGetPropertyInfo       = (mal_proc)AudioUnitGetPropertyInfo;
     pContext->coreaudio.AudioUnitGetProperty           = (mal_proc)AudioUnitGetProperty;
     pContext->coreaudio.AudioUnitSetProperty           = (mal_proc)AudioUnitSetProperty;
     pContext->coreaudio.AudioUnitInitialize            = (mal_proc)AudioUnitInitialize;