public boolean initOnThisThread(boolean isRightChannel, int sampleRate) {
this.sampleRate = sampleRate;
if (portDevices.size() == 0) {
Log.w(TAG, "No devices found");
return false;
}
UsbAudioDevice device;
// Right devices has the higher port
if (portDevices.size() == 2) {
Iterator<IntObjectCursor<UsbAudioDevice>> c = portDevices.iterator();
UsbAudioDevice first = c.next().value;
UsbAudioDevice second = c.next().value;
int port;
if (isRightChannel) {
port = Math.max(first.getPort(), second.getPort());
} else {
port = Math.min(first.getPort(), second.getPort());
}
device = portDevices.get(port);
} else {
Iterator<IntObjectCursor<UsbAudioDevice>> c = portDevices.iterator();
device = c.next().value;
}
port = device.getPort();
portReceivers.put(port, this);
device = portDevices.get(port);
this.nativeSampleRate = device.getDescriptor().sampleRate;
byteBuffer = ByteBuffer.allocateDirect(this.nativeSampleRate); // 1s
tmpShortBuffer = new short[byteBuffer.capacity() / 2];
if (sampleRate != nativeSampleRate && sampleRate != (nativeSampleRate / 2)) {
Log.e(TAG, "Sample rate != nativeSampleRate or nativeSampleRate / 2");
return false;
}
return device.beginReadAudio();
}
public static void initUsbAudioDevices() {
if (isInitted) return;
UsbDevice[] rawUsbDevices = UsbAudioDriver.getAttachedAudioDevices();
ArrayList<UsbAudioDevice> audioDevices = new ArrayList<>();
for (UsbDevice rawUsbDevice : rawUsbDevices) {
Log.d(TAG, rawUsbDevice.getDeviceName());
UsbAudioDeviceDescriptor deviceDescriptor =
KnownDevices.findByVenderProduct(rawUsbDevice.getVendorId(), rawUsbDevice.getProductId());
if (deviceDescriptor == null) {
Log.d(TAG, "Found unknown device " + rawUsbDevice.getDeviceName());
}
final UsbAudioDevice audioDevice =
new UsbAudioDevice(
deviceDescriptor,
rawUsbDevice.getDeviceName(),
(device, data, length) -> {
writeToPort(data, length, device.getPort());
});
portDevices.put(audioDevice.getPort(), audioDevice);
}
isInitted = true;
}
@Override
public void stop() {
device.close();
}
