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ftc
2020-11-10 20:36:10 +03:00
parent 4cff114d31
commit de7247af5b
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.gitignore
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# Local History for Visual Studio # Local History for Visual Studio
.localhistory/ .localhistory/
Properties/launchSettings.json
Measurer.cs
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using NAudio.Dsp;
using NAudio.Wave;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
namespace SoundThermo
{
/// <summary>
/// Generates sine sample in the form
/// amp * sin(x / freq)
/// </summary>
class ThermoSampleProvider : ISampleProvider
{
public const int SAMPLE_RATE = 44100;
WaveFormat format;
float freq;
float amp;
int alreadyGeneratedSamples;
public ThermoSampleProvider(float freq, float amp)
{
format = WaveFormat.CreateIeeeFloatWaveFormat(SAMPLE_RATE, 1);
this.freq = freq;
this.amp = amp;
alreadyGeneratedSamples = 0;
}
public WaveFormat WaveFormat
{
get
{
return format;
}
}
public int Read(float[] buffer, int offset, int count)
{
for (int i = 0; i < count; i++)
{
int sample = alreadyGeneratedSamples++;
buffer[offset + i] = amp * MathF.Sin(2 * MathF.PI * sample * freq / SAMPLE_RATE);
}
return count;
}
}
/// <summary>
/// Returns ratio of output signal to input signal
/// </summary>
class Measurer
{
public enum MeasureChannel
{
Left,
Right
}
const int THERMO_FREQ = 6000;
const float THERMO_AMP = 0.1f;
WaveInEvent inputDevice;
WaveOutEvent outputDevice;
MeasureChannel channel;
public Measurer(WaveInEvent inputDevice, WaveOutEvent outputDevice, MeasureChannel ch)
{
this.inputDevice = inputDevice;
this.outputDevice = outputDevice;
this.channel = ch;
}
public async Task<float> Measure(float duration)
{
var recorder = new Recorder(inputDevice);
var provider = new ThermoSampleProvider(THERMO_FREQ, THERMO_AMP);
outputDevice.Init(provider.ToStereo(channel == MeasureChannel.Left ? 1 : 0, channel == MeasureChannel.Right ? 1 : 0));
outputDevice.Play();
await recorder.Record(duration);
outputDevice.Stop();
var newSamples = new List<float>();
int leftPos = 0;
while (leftPos < recorder.samples.Count && MathF.Abs(recorder.samples[leftPos]) < 1e-4) leftPos++;
int rightPos = recorder.samples.Count - 1;
while (rightPos > 0 && MathF.Abs(recorder.samples[rightPos]) < 1e-4) rightPos--;
for (int i = leftPos; i <= rightPos; i++) newSamples.Add(recorder.samples[i]);
int pow = 1;
int m = 0;
while (2 * pow <= newSamples.Count)
{
pow *= 2;
m++;
}
var data = new Complex[pow];
for (int i = 0; i < data.Length; i++)
{
data[i].X = newSamples[i];
data[i].Y = 0;
}
FastFourierTransform.FFT(true, m, data);
float max = -1;
int argmax = 0;
for (int i = 0; i < data.Length; i++)
{
var amp = MathF.Sqrt(data[i].X * data[i].X + data[i].Y * data[i].Y);
if (amp > max)
{
max = amp;
argmax = i;
}
}
float desired = THERMO_FREQ * pow / ThermoSampleProvider.SAMPLE_RATE;
if (MathF.Abs(desired - argmax) < 1e-3)
{
// max - amplitude on desired frequency
return max / THERMO_AMP;
}
return float.NaN;
}
}
}
Program.cs
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using System;
using System.CommandLine;
using System.CommandLine.Invocation;
using System.Globalization;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using NAudio.Wave;
namespace SoundThermo
{
class Program
{
static void Main(string[] args)
{
CultureInfo.CurrentCulture = new CultureInfo("en-US");
var rootCommand = new RootCommand();
var listCommand = new Command("list", "List all available devices");
listCommand.Handler = CommandHandler.Create(ListDevices);
var recordCommand = new Command("record")
{
new Option<string>("--input", "Input device to record from (GUID)"),
new Option<float>("--duration", "How many seconds of audio you want to record"),
};
recordCommand.Handler = CommandHandler.Create<string, float>(RecordSamples);
var measureCommand = new Command("measure")
{
new Option<string>("--input", "Input device to record from (GUID)"),
new Option<string>("--output", "Output device to play sound to (GUID)"),
new Option<float>("--duration", "How many seconds of audio you want to record (uses twice this time because of recording on two channels)"),
};
measureCommand.Handler = CommandHandler.Create<string, string, float>(Measure);
rootCommand.AddCommand(listCommand);
rootCommand.AddCommand(measureCommand);
rootCommand.AddCommand(recordCommand);
rootCommand.InvokeAsync(args).Wait();
}
private async static Task Measure(string input, string output, float duration)
{
var leftMea = new Measurer(GetInputDevice(input), GetOutputDevice(output), Measurer.MeasureChannel.Left);
var leftResult = await leftMea.Measure(duration);
var rightMea = new Measurer(GetInputDevice(input), GetOutputDevice(output), Measurer.MeasureChannel.Right);
var rightResult = await rightMea.Measure(duration);
float k = 2 * rightResult;
float v0v = leftResult / k;
// assume r2 = 10K
float r1 = 10000 / v0v - 10000;
float t = 1.0f / (MathF.Log(r1 / 10000) / 4300.0f + 1.0f / 298.0f) - 273.0f;
Console.WriteLine(t.ToString());
}
private static WaveOutEvent GetOutputDevice(string guid)
{
WaveOutEvent device = null;
for (int n = -1; n < WaveOut.DeviceCount; n++)
{
var caps = WaveOut.GetCapabilities(n);
if (caps.ProductGuid.ToString() == guid)
{
device = new WaveOutEvent();
device.DeviceNumber = n;
break;
}
}
if (device == null)
{
throw new Exception("Unable to find device " + guid);
}
return device;
}
private static WaveInEvent GetInputDevice(string guid)
{
WaveInEvent device = null;
for (int n = -1; n < WaveIn.DeviceCount; n++)
{
var caps = WaveIn.GetCapabilities(n);
if (caps.ProductGuid.ToString() == guid)
{
device = new WaveInEvent();
device.DeviceNumber = n;
break;
}
}
if (device == null)
{
throw new Exception("Unable to find device " + guid);
}
return device;
}
private async static Task RecordSamples(string input, float duration)
{
WaveInEvent device = GetInputDevice(input);
var rec = new Recorder(device);
await rec.Record(duration);
using (FileStream fs = File.OpenWrite("recorded.txt"))
{
for (int i = 0; i < rec.samples.Count; i++)
{
fs.Write(Encoding.UTF8.GetBytes(rec.samples[i].ToString() + "\n"));
}
}
}
private static void ListDevices()
{
Console.WriteLine("List of audio devices in your system");
Console.WriteLine("Output devices:");
for (int n = -1; n < WaveOut.DeviceCount; n++)
{
var caps = WaveOut.GetCapabilities(n);
Console.WriteLine($"{n}: {caps.ProductName} {caps.ProductGuid}");
}
Console.WriteLine("Input devices:");
for (int n = -1; n < WaveIn.DeviceCount; n++)
{
var caps = WaveIn.GetCapabilities(n);
Console.WriteLine($"{n}: {caps.ProductName} {caps.ProductGuid}");
}
}
}
}
Recorder.cs
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using NAudio.Wave;
using System.Collections.Generic;
using System.Threading.Tasks;
namespace SoundThermo
{
class Recorder
{
const int RECORDING_RATE = 44100;
private WaveInEvent device;
public List<float> samples;
public Recorder(WaveInEvent device)
{
this.device = device;
}
public async Task Record(float duration)
{
device.WaveFormat = WaveFormat.CreateIeeeFloatWaveFormat(RECORDING_RATE, 1);
samples = new List<float>();
device.DataAvailable += OnDataAvailable;
device.StartRecording();
await Task.Delay((int)(duration * 1000));
device.StopRecording();
}
private void OnDataAvailable(object sender, WaveInEventArgs e)
{
var buffer = new WaveBuffer(e.Buffer);
for (int i = 0; i < e.BytesRecorded / 4; i++)
{
samples.Add(buffer.FloatBuffer[i]);
}
}
}
}
SoundThermo.csproj
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>netcoreapp3.1</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="NAudio" Version="1.10.0" />
<PackageReference Include="System.CommandLine" Version="2.0.0-beta1.20371.2" />
</ItemGroup>
</Project>
SoundThermo.sln
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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 16
VisualStudioVersion = 16.0.29209.62
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SoundThermo", "SoundThermo.csproj", "{95349FF5-57FB-44EC-BDEB-E7902C04CDDC}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{95349FF5-57FB-44EC-BDEB-E7902C04CDDC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{95349FF5-57FB-44EC-BDEB-E7902C04CDDC}.Debug|Any CPU.Build.0 = Debug|Any CPU
{95349FF5-57FB-44EC-BDEB-E7902C04CDDC}.Release|Any CPU.ActiveCfg = Release|Any CPU
{95349FF5-57FB-44EC-BDEB-E7902C04CDDC}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {A08CF9A2-F3A7-486E-BC48-B0D0BACF659B}
EndGlobalSection
EndGlobal