fn audiounit_get_devices_of_type()

in src/backend/mod.rs [1976:2022]

• 37 lines of code
• 8 McCabe index (conditional complexity)

fn audiounit_get_devices_of_type(devtype: DeviceType) -> Vec<AudioObjectID> {
    assert!(devtype.intersects(DeviceType::INPUT | DeviceType::OUTPUT));
    debug_assert_running_serially();

    let mut devices = get_devices();

    // Remove the aggregate device from the list of devices (if any).
    devices.retain(|&device| {
        // TODO: (bug 1628411) Figure out when `device` is `kAudioObjectUnknown`.
        if device == kAudioObjectUnknown {
            false
        } else if let Ok(uid) = get_device_global_uid(device) {
            let uid = uid.into_string();
            !uid.contains(PRIVATE_AGGREGATE_DEVICE_NAME)
                && !uid.contains(VOICEPROCESSING_AGGREGATE_DEVICE_NAME)
        } else {
            // Fail to get device uid.
            true
        }
    });

    // Expected sorted but did not find anything in the docs.
    devices.sort_unstable();
    if devtype.contains(DeviceType::INPUT | DeviceType::OUTPUT) {
        return devices;
    }

    let mut devices_in_scope = Vec::new();
    for device in devices {
        let label = match get_device_label(device, DeviceType::OUTPUT | DeviceType::INPUT) {
            Ok(label) => label.into_string(),
            Err(e) => format!("Unknown(error: {})", e),
        };
        let info = format!("{} ({})", device, label);

        if let Ok(channels) = get_channel_count(device, devtype) {
            cubeb_log!("Device {} has {} {:?}-channels", info, channels, devtype);
            if channels > 0 {
                devices_in_scope.push(device);
            }
        } else {
            cubeb_log!("Cannot get the channel count for device {}. Ignored.", info);
        }
    }

    devices_in_scope
}