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Posted 21 Mar 2008

Low Latency Audio using ASIO Drivers in .NET

, 7 May 2008
Demonstrates access to your sound hardware with ASIO drivers
// BlueWave.Interop.Asio by Rob Philpott. Please send all bugs/enhancements to
//  This file and the code contained within is freeware and may be
// distributed and edited without restriction. You may be bound by licencing restrictions
// imposed by Steinberg - check with them prior to distributing anything.

#include "AsioRedirect.h"

#pragma once
#pragma managed

using namespace System;

namespace BlueWave
	namespace Interop
		namespace Asio
			// represents a single audio channel (input or output) on the soundcard
			public ref class Channel

				// pointer to owner
				IAsio* _pDriver;

				// true is this is an input channel
				bool _isInput;

				// the channel name
				String^ _name;

				// the number of samples in the buffer
				int _bufferSize;

				// the range for floats for bitperfect reproduction
				const static float __maxSampleValue = 8388607.0f / 8388608.0f;

				// sample format
				ASIOSampleType _sampleType;

				// pointer to their buffer
				DWORD* _pTheirBuffer0;
				DWORD* _pTheirBuffer1;

				// what buffer should be affected by our indexer
				DWORD* _pTheirCurrentBuffer;

				// internal construction only
				Channel(IAsio* pAsio, bool IsInput, int channelNumber, void* pTheirBuffer0, void* pTheirBuffer1, int bufferSize);

				// what buffer should be affected by our indexer
				void SetDoubleBufferIndex(long doubleBufferIndex);


				// the channel name
				property String^ Name { String^ get(); }

				// the buffer size in samples
				property int BufferSize { int get(); }

				// the sample type
				property double SampleType { double get(); }

				// indexer for setting the value of sample in the buffer
				property float default[int] { void set(int sample, float value); float get(int sample); }


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About the Author

Rob Philpott
United Kingdom United Kingdom
I am a .NET architect/developer based in London working mostly on financial trading systems. My love of computers started at an early age with BASIC on a 3KB VIC20 and progressed onto a 32KB BBC Micro using BASIC and 6502 assembly language. From there I moved on to the blisteringly fast Acorn Archimedes using BASIC and ARM assembly.

I started developing with C++ since 1990, where it was introduced to me in my first year studying for a Computer Science degree at the University of Nottingham. I started professionally with Visual C++ version 1.51 in 1993.

I moved over to C# and .NET in early 2004 after a long period of denial that anything could improve upon C++.

Recently I did a bit of work in my old language of C++ and I now realise that frankly, it's a total pain in the arse.

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