* workaround for device drivers that do not support "kAudioDevicePropertyPreferredChannelLayout".

  Grmbl @ Digidesign coders...

modules/audio_output/auhal.c

@@ -292,40 +292,49 @@ static int OpenAnalog( aout_instance_t *p_aout )
     }
 
     err = OpenAComponent( p_sys->au_component, &p_sys->au_unit );
-    if( err )
+    if( err != noErr )
     {
         msg_Warn( p_aout, "we cannot open our HAL component" );
         return VLC_FALSE;
     }
     
     /* Set the device we will use for this output unit */
-    verify_noerr( AudioUnitSetProperty( p_sys->au_unit,
+    err = AudioUnitSetProperty( p_sys->au_unit,
                          kAudioOutputUnitProperty_CurrentDevice,
                          kAudioUnitScope_Global,
                          0,
                          &p_sys->i_selected_dev,
-                         sizeof( AudioDeviceID )));
+                         sizeof( AudioDeviceID ));
+                         
+    if( err != noErr )
+    {
+        msg_Warn( p_aout, "we cannot select the audio device" );
+        return VLC_FALSE;
+    }
                          
     /* Get the current format */
     i_param_size = sizeof(AudioStreamBasicDescription);
 
-    verify_noerr( AudioUnitGetProperty( p_sys->au_unit,
+    err = AudioUnitGetProperty( p_sys->au_unit,
                                    kAudioUnitProperty_StreamFormat,
                                    kAudioUnitScope_Input,
                                    0,
                                    &DeviceFormat,
-                                   &i_param_size ));
+                                   &i_param_size );
                                    
-    msg_Dbg( p_aout, STREAM_FORMAT_MSG( "current format is: ", DeviceFormat ) );
+    if( err != noErr ) return VLC_FALSE;
+    else msg_Dbg( p_aout, STREAM_FORMAT_MSG( "current format is: ", DeviceFormat ) );
 
     /* Get the channel layout of the device side of the unit (vlc -> unit -> device) */
-    verify_noerr( AudioUnitGetPropertyInfo( p_sys->au_unit,
+    err = AudioUnitGetPropertyInfo( p_sys->au_unit,
                                    kAudioDevicePropertyPreferredChannelLayout,
                                    kAudioUnitScope_Output,
                                    0,
                                    &i_param_size,
-                                   NULL ));
+                                   NULL );
 
+    if( err == noErr )
+    {
         layout = (AudioChannelLayout *)malloc( i_param_size);
 
         verify_noerr( AudioUnitGetProperty( p_sys->au_unit,
@@ -416,6 +425,12 @@ static int OpenAnalog( aout_instance_t *p_aout )
             }
         }
         if( layout ) free( layout );
+    }
+    else
+    {
+        msg_Warn( p_aout, "this driver does not support kAudioDevicePropertyPreferredChannelLayout. BAD DRIVER AUTHOR !!!" );
+        p_aout->output.output.i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
+    }
 
     msg_Dbg( p_aout, "selected %d physical channels for device output", aout_FormatNbChannels( &p_aout->output.output ) );
     msg_Dbg( p_aout, "VLC will output: %s", aout_FormatPrintChannels( &p_aout->output.output ));