private async Task LSLPushChunk(MuseSample sample)
{
ValueSet message = new ValueSet
{
{ LSLBridge.Constants.LSL_MESSAGE_STREAM_NAME, EEGStreamName }
};
// Can only send 1D array with garbage AppService :S - inlined as channel1sample1,channel1sample2,channel1sample3...channel2sample1,channel2sample2...
if (streamInfo.ChannelDataType == LSLBridgeDataType.DOUBLE)
{
double[] data = new double[Constants.MUSE_SAMPLE_COUNT * channelCount];
for (int i = 0; i < channelCount; i++)
{
var channelData = sample.ChannelData[channelUUIDs[i]]; // Maintains muse-lsl.py ordering.
for (int j = 0; j < Constants.MUSE_SAMPLE_COUNT; j++)
{
data[(i * Constants.MUSE_SAMPLE_COUNT) + j] = channelData[j];
}
}
message.Add(LSLBridge.Constants.LSL_MESSAGE_CHUNK_DATA, data);
}
// Default to float.
else if (streamInfo.ChannelDataType == LSLBridgeDataType.FLOAT)
{
float[] data = new float[Constants.MUSE_SAMPLE_COUNT * channelCount];
for (int i = 0; i < channelCount; i++)
{
var channelData = sample.ChannelData[channelUUIDs[i]]; // Maintains muse-lsl.py ordering.
for (int j = 0; j < Constants.MUSE_SAMPLE_COUNT; j++)
{
data[(i * Constants.MUSE_SAMPLE_COUNT) + j] = (float)channelData[j];
}
}
message.Add(LSLBridge.Constants.LSL_MESSAGE_CHUNK_DATA, data);
}
else
{
throw new InvalidOperationException("Can't push LSL chunk - unsupported stream data type. Must use float32 or double64.");
}
message.Add(LSLBridge.Constants.LSL_MESSAGE_CHUNK_TIMESTAMPS, sample.Timestamps);
message.Add(LSLBridge.Constants.LSL_MESSAGE_CHUNK_TIMESTAMPS2, sample.Timestamps2);
await AppServiceManager.SendMessageAsync(LSLBridge.Constants.LSL_MESSAGE_TYPE_SEND_CHUNK, message);
}
private async void Channel_ValueChanged(GattCharacteristic sender, GattValueChangedEventArgs args)
{
if (isStreaming)
{
string bits = GetBits(args.CharacteristicValue);
ushort museTimestamp = PacketConversion.ToUInt16(bits, 0); // Zero bit offset, since first 16 bits represent Muse timestamp.
MuseSample sample;
lock (sampleBuffer)
{
if (!sampleBuffer.ContainsKey(museTimestamp))
{
sample = new MuseSample();
sampleBuffer.Add(museTimestamp, sample);
sample.BaseTimestamp = TimestampFormat.GetNow(); // This is the real timestamp, not the Muse timestamp which we use to group channel data.
sample.BasetimeStamp2 = TimestampFormat.GetType() != TimestampFormat2.GetType() ?
TimestampFormat2.GetNow() // This is the real timestamp (format 2), not the Muse timestamp which we use to group channel data.
: sample.BasetimeStamp2 = sample.BaseTimestamp; // Ensures they are equal if using same timestamp format.
}
else
{
sample = sampleBuffer[museTimestamp];
}
// Get time samples.
sample.ChannelData[sender.Uuid] = GetTimeSamples(bits);
}
// If we have all 5 channels, we can push the 12 samples for each channel.
if (sample.ChannelData.Count == channelCount)
{
await LSLPushChunk(sample);
lock (sampleBuffer)
sampleBuffer.Remove(museTimestamp);
}
}
}
