Initial commit — WPF guitar note name tutor using FFT frequency detection
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@@ -0,0 +1,37 @@
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using System.Reflection;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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// General Information about an assembly is controlled through the following
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// set of attributes. Change these attribute values to modify the information
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// associated with an assembly.
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[assembly: AssemblyTitle("SoundCapture")]
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[assembly: AssemblyDescription("Sound capture library")]
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[assembly: AssemblyConfiguration("")]
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[assembly: AssemblyCompany("notmasteryet")]
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[assembly: AssemblyProduct("FftGuitarTuner")]
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[assembly: AssemblyCopyright("Copyright © notmasteryet 2009")]
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[assembly: AssemblyTrademark("")]
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[assembly: AssemblyCulture("")]
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// Setting ComVisible to false makes the types in this assembly not visible
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// to COM components. If you need to access a type in this assembly from
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// COM, set the ComVisible attribute to true on that type.
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[assembly: ComVisible(false)]
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// The following GUID is for the ID of the typelib if this project is exposed to COM
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[assembly: Guid("b12d1bc8-57d3-464f-9286-b1456655872a")]
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// Version information for an assembly consists of the following four values:
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//
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// Major Version
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// Minor Version
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// Build Number
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// Revision
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//
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// You can specify all the values or you can default the Build and Revision Numbers
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// by using the '*' as shown below:
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// [assembly: AssemblyVersion("1.0.*")]
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[assembly: AssemblyVersion("1.0.0.0")]
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[assembly: AssemblyFileVersion("1.0.0.0")]
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@@ -0,0 +1,54 @@
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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="3.5" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<PropertyGroup>
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<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
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<ProductVersion>9.0.30729</ProductVersion>
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<SchemaVersion>2.0</SchemaVersion>
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<ProjectGuid>{DAE12676-B26C-4487-A1A5-D7FE2E64E6CE}</ProjectGuid>
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<OutputType>Library</OutputType>
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<AppDesignerFolder>Properties</AppDesignerFolder>
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<RootNamespace>SoundCapture</RootNamespace>
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<AssemblyName>SoundCapture</AssemblyName>
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<TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
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<FileAlignment>512</FileAlignment>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\Debug\</OutputPath>
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<DefineConstants>DEBUG;TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
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<DebugType>pdbonly</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\Release\</OutputPath>
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<DefineConstants>TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<ItemGroup>
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<Reference Include="Microsoft.DirectX.DirectSound, Version=1.0.2902.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
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<Reference Include="System" />
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<Reference Include="System.Core">
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<RequiredTargetFramework>3.5</RequiredTargetFramework>
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</Reference>
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</ItemGroup>
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<ItemGroup>
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<Compile Include="SoundCaptureBase.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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<Compile Include="SoundCaptureDevice.cs" />
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<Compile Include="SoundCaptureException.cs" />
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
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Other similar extension points exist, see Microsoft.Common.targets.
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<Target Name="BeforeBuild">
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</Target>
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<Target Name="AfterBuild">
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</Target>
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-->
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</Project>
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@@ -0,0 +1,194 @@
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using System;
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using System.Threading;
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using Microsoft.DirectX.DirectSound;
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using Microsoft.Win32.SafeHandles;
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namespace SoundCapture
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{
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/// <summary>
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/// Base class to capture audio samples.
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/// </summary>
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public abstract class SoundCaptureBase : IDisposable
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{
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const int BufferSeconds = 3;
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const int NotifyPointsInSecond = 2;
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// change in next two will require also code change
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const int BitsPerSample = 16;
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const int ChannelCount = 1;
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int _sampleRate = 44100;
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bool _disposed;
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private bool IsCapturing { get; set; }
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protected int SampleRate
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{
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get { return _sampleRate; }
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set
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{
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if (_sampleRate <= 0) throw new ArgumentOutOfRangeException();
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EnsureIdle();
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_sampleRate = value;
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}
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}
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Capture _capture;
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CaptureBuffer _buffer;
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Notify _notify;
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int _bufferLength;
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readonly AutoResetEvent _positionEvent;
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readonly SafeWaitHandle _positionEventHandle;
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readonly ManualResetEvent _terminated;
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Thread _thread;
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readonly SoundCaptureDevice _device;
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protected SoundCaptureBase()
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: this(SoundCaptureDevice.GetDefaultDevice())
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{
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}
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protected SoundCaptureBase(SoundCaptureDevice device)
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{
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_device = device;
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_positionEvent = new AutoResetEvent(false);
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_positionEventHandle = _positionEvent.SafeWaitHandle;
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_terminated = new ManualResetEvent(true);
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}
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private void EnsureIdle()
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{
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if (IsCapturing)
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throw new SoundCaptureException("Capture is in process");
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}
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/// <summary>
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/// Starts capture process.
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/// </summary>
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public void Start()
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{
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EnsureIdle();
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IsCapturing = true;
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WaveFormat format = new WaveFormat
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{
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Channels = ChannelCount,
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BitsPerSample = BitsPerSample,
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SamplesPerSecond = SampleRate,
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FormatTag = WaveFormatTag.Pcm,
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};
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format.BlockAlign = (short)((format.Channels * format.BitsPerSample + 7) / 8);
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format.AverageBytesPerSecond = format.BlockAlign * format.SamplesPerSecond;
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_bufferLength = format.AverageBytesPerSecond * BufferSeconds;
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CaptureBufferDescription desciption = new CaptureBufferDescription
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{
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Format = format,
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BufferBytes = _bufferLength
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};
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_capture = new Capture(_device.Id);
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_buffer = new CaptureBuffer(desciption, _capture);
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const int waitHandleCount = BufferSeconds * NotifyPointsInSecond;
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BufferPositionNotify[] positions = new BufferPositionNotify[waitHandleCount];
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for (int i = 0; i < waitHandleCount; i++)
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{
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BufferPositionNotify position = new BufferPositionNotify
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{
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Offset = (i + 1)*_bufferLength/positions.Length - 1,
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EventNotifyHandle = _positionEventHandle.DangerousGetHandle()
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};
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positions[i] = position;
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}
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_notify = new Notify(_buffer);
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_notify.SetNotificationPositions(positions);
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_terminated.Reset();
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_thread = new Thread(ThreadLoop) {Name = "Sound capture"};
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_thread.Start();
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}
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private void ThreadLoop()
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{
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_buffer.Start(true);
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try
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{
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int nextCapturePosition = 0;
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WaitHandle[] handles = new WaitHandle[] { _terminated, _positionEvent };
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while (WaitHandle.WaitAny(handles) > 0)
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{
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int capturePosition, readPosition;
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_buffer.GetCurrentPosition(out capturePosition, out readPosition);
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int lockSize = readPosition - nextCapturePosition;
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if (lockSize < 0) lockSize += _bufferLength;
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if((lockSize & 1) != 0) lockSize--;
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int itemsCount = lockSize >> 1;
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short[] data = (short[])_buffer.Read(nextCapturePosition, typeof(short), LockFlag.None, itemsCount);
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ProcessData(data);
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nextCapturePosition = (nextCapturePosition + lockSize) % _bufferLength;
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}
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}
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finally
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{
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_buffer.Stop();
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}
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}
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/// <summary>
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/// Processes the captured data.
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/// </summary>
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/// <param name="data">Captured data</param>
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protected abstract void ProcessData(short[] data);
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/// <summary>
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/// Stops capture process.
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/// </summary>
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public void Stop()
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{
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if (IsCapturing)
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{
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IsCapturing = false;
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_terminated.Set();
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//_thread.
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_thread.Join();
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_notify.Dispose();
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_buffer.Dispose();
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_capture.Dispose();
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}
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}
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void IDisposable.Dispose()
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{
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Dispose(true);
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}
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~SoundCaptureBase()
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{
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Dispose(false);
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}
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private void Dispose(bool disposing)
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{
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if (_disposed) return;
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_disposed = true;
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GC.SuppressFinalize(this);
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if (IsCapturing) Stop();
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_positionEventHandle.Dispose();
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_positionEvent.Close();
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_terminated.Close();
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}
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}
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}
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@@ -0,0 +1,68 @@
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using System;
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using System.Collections.Generic;
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using Microsoft.DirectX.DirectSound;
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namespace SoundCapture
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{
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/// <summary>
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/// Capture device.
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/// </summary>
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public class SoundCaptureDevice
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{
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readonly Guid _id;
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readonly string _name;
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public bool IsDefault
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{
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get { return _id == Guid.Empty; }
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}
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/// <summary>
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/// Name of the device.
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/// </summary>
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public string Name
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{
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get { return _name; }
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}
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internal Guid Id
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{
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get { return _id; }
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}
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internal SoundCaptureDevice(Guid id, string name)
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{
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_id = id;
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_name = name;
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}
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public static SoundCaptureDevice[] GetDevices()
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{
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CaptureDevicesCollection captureDevices = new CaptureDevicesCollection();
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List<SoundCaptureDevice> devices = new List<SoundCaptureDevice>();
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foreach (DeviceInformation captureDevice in captureDevices)
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{
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devices.Add(new SoundCaptureDevice(captureDevice.DriverGuid, captureDevice.Description));
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}
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return devices.ToArray();
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}
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public static SoundCaptureDevice GetDefaultDevice()
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{
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CaptureDevicesCollection captureDevices = new CaptureDevicesCollection();
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SoundCaptureDevice device = null;
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foreach (DeviceInformation captureDevice in captureDevices)
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{
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if(captureDevice.DriverGuid == Guid.Empty)
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{
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device = new SoundCaptureDevice(captureDevice.DriverGuid, captureDevice.Description);
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break;
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}
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}
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if (device == null)
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throw new SoundCaptureException("Default capture device is not found");
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return device;
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}
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}
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}
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@@ -0,0 +1,12 @@
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using System;
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namespace SoundCapture
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{
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public class SoundCaptureException : Exception
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{
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public SoundCaptureException(string message)
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: base(message)
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{
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}
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}
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}
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Reference in New Issue
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