fn audiounit_get_current_channel_layout()

in src/backend/mod.rs [1142:1181]

• 38 lines of code
• 3 McCabe index (conditional complexity)

fn audiounit_get_current_channel_layout(output_unit: AudioUnit) -> Result<Vec<mixer::Channel>> {
    debug_assert_running_serially();
    let mut rv = NO_ERR;
    let mut size: usize = 0;
    rv = audio_unit_get_property_info(
        output_unit,
        kAudioUnitProperty_AudioChannelLayout,
        kAudioUnitScope_Output,
        AU_OUT_BUS,
        &mut size,
        None,
    );
    if rv != NO_ERR {
        cubeb_log!(
            "AudioUnitGetPropertyInfo/kAudioUnitProperty_AudioChannelLayout rv={}",
            rv
        );
        return Err(Error::error());
    }
    debug_assert!(size > 0);

    let mut layout = make_sized_audio_channel_layout(size);
    rv = audio_unit_get_property(
        output_unit,
        kAudioUnitProperty_AudioChannelLayout,
        kAudioUnitScope_Output,
        AU_OUT_BUS,
        layout.as_mut(),
        &mut size,
    );
    if rv != NO_ERR {
        cubeb_log!(
            "AudioUnitGetProperty/kAudioUnitProperty_AudioChannelLayout rv={}",
            rv
        );
        return Err(Error::error());
    }

    audiounit_convert_channel_layout(layout.as_ref())
}