public AudioResource(SpectrumVideoDemodConfig config, CanvasContext ctx)
{
//Set
this.label = config.label;
//Get demodulator
switch (config.demodType)
{
case "WBFM": demodulator = new WbFmDemodulator(); break;
default: throw new Exception("Unknown demodulator type.");
}
//Make buffers
bufferSize = ctx.BufferSize;
generalBuffer = UnsafeBuffer.Create(ctx.BufferSize, out generalBufferComplexPtr);
generalBufferFloatPtr = (float *)generalBufferComplexPtr;
audioABuffer = UnsafeBuffer.Create(ctx.BufferSize, out audioABufferPtr);
audioBBuffer = UnsafeBuffer.Create(ctx.BufferSize, out audioBBufferPtr);
//Init audio
demodDecimator = ComplexDecimator.CalculateDecimator(ctx.DecimatedSampleRate, config.demodBandwidth, 20, config.demodBandwidth * 0.05f, out float demodSampleRate);
float actualAudioRate = demodulator.Configure(ctx.BufferSize, demodSampleRate, config.outputSampleRate);
audioResampler = new ArbitraryStereoResampler(actualAudioRate, config.outputSampleRate, ctx.BufferSize);
//Create output
output = ctx.OutputProvider.GetAudioOutput(config.outputFilename, config.outputSampleRate, bufferSize);
}
private void Form1_Load(object sender, EventArgs e)
{
//Add all entries to the pie graph to start off with
for (int i = 0; i < 32; i++)
{
rdsGroupChart.Series["Groups"].Points.AddXY("", 0);
rdsGroupChart.Series["Groups"].Points[i].IsVisibleInLegend = false;
}
//Configure table
rdsHistory.Columns.Add(GenerateColumn("PI", 40));
rdsHistory.Columns.Add(GenerateColumn("Group", 50));
rdsHistory.Columns.Add(GenerateColumn("Description", -1));
//Create buffers
iqBuffer = UnsafeBuffer.Create(BUFFER_SIZE, out iqBufferPtr);
audioBuffer = UnsafeBuffer.Create(BUFFER_SIZE, out audioBufferPtr);
//Open USB device
usb = new LibUSBProvider();
device = AirSpyDevice.OpenDevice(usb);
//Configure radio
device.SetLinearGain(gain.Value / 100f);
device.CenterFrequency = (long)(freq.Value * 1000000);
device.SampleRate = 3000000;
device.StartRx();
//Create filter
var filterBuilder = new LowPassFilterBuilder(device.SampleRate, BANDWIDTH / 2)
.SetAutomaticTapCount(BANDWIDTH * 0.1f, 50)
.SetWindow();
filter = ComplexFirFilter.CreateFirFilter(filterBuilder, filterBuilder.GetDecimation(out float decimatedSampleRate));
//Create FM and RDS
fm = new WbFmDemodulator();
fm.Configure(BUFFER_SIZE, decimatedSampleRate, 48000);
fm.OnStereoDetected += Fm_OnStereoDetected;
fm.OnRdsDetected += Fm_OnRdsDetected;
rds = new RdsClient();
fm.OnRdsFrameEmitted += (ulong frame) => rds.ProcessFrame(frame);
//Bind RDS client commands
rds.ProgramService.OnPartialTextReceived += ProgramService_OnPartialTextReceived;
rds.PiCode.OnPiCodeChanged += PiCode_OnPiCodeChanged;
rds.ProgramType.OnCategoryChanged += ProgramType_OnCategoryChanged;
rds.RadioText.OnPartialTextReceived += RadioText_OnPartialTextReceived;
rds.OnCommand += Rds_OnCommand;
//Create worker thread
worker = new Thread(WorkerThread);
worker.IsBackground = true;
worker.Start();
}
public ViewGenerator(SavedViewData info, int bufferSize, float sampleRate)
{
//Set
this.info = info;
this.bufferSize = bufferSize;
//Configure offset
mutator = new DownConverter(1);
mutator.SampleRate = sampleRate;
mutator.Frequency = info.offset;
//Configure decimator
decimator = new ComplexDecimator(sampleRate, sampleRate / info.decimation, (int)info.decimation);
sampleRate /= info.decimation;
//Get component list and image size
components = info.CreateComponents(sampleRate, out width, out height);
//Find out what workers are required
foreach (var c in components)
{
fftRequired = fftRequired || c.RequiresFft;
demodulatorRequired = demodulatorRequired || c.RequiresAudio;
}
//Create these workers
if (fftRequired)
{
fft = new FFTProcessorComplex(info.fftSize);
}
if (demodulatorRequired)
{
//Set up decimator
audioDecimationRate = DecimationUtil.CalculateDecimationRate(sampleRate, info.audioBandwidth, out audioOutputRate);
audioDecimator = new ComplexDecimator(sampleRate, info.audioBandwidth, audioDecimationRate);
//Set up demodulator
demodulator = new WbFmDemodulator();
demodulator.Configure(bufferSize, audioOutputRate);
}
//Initialize all
foreach (var c in components)
{
c.Init(info, fft, demodulator);
}
//Create buffers
iqBuffer = UnsafeBuffer.Create(bufferSize, sizeof(Complex));
iqPtr = (Complex *)iqBuffer;
}
protected override void PrepareBenchmark(int sampleRate, int bufferSize)
{
//Create buffers
iqBuffer = UnsafeBuffer.Create(bufferSize, out iqBufferPtr);
audioABuffer = UnsafeBuffer.Create(bufferSize, out audioABufferPtr);
audioBBuffer = UnsafeBuffer.Create(bufferSize, out audioBBufferPtr);
//Create IQ decimator
decimator = ComplexDecimator.CalculateDecimator(sampleRate, bandwidth, 15, bandwidth * 0.05f, out float decimatedIqRate);
//Create demodulator
demod = new WbFmDemodulator();
demod.Configure(bufferSize, sampleRate, DecimationUtil.CalculateDecimationRate(decimatedIqRate, outputRateTarget, out float actualOutputRate));
demod.UseRds();
}