XMAudioSource.cpp
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XMAudioSource.cpp
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	#include <echo/Resource/XMAudioSource.h>
	#include <echo/Audio/AudioBuffer.h>
	#include <iostream>

	namespace Echo
	{
	XMAudioSource::XMAudioSource(File xmFile) : mModFile(0), mModFileMem(0), mSampleData(0), mSampleDataSize(0)
	{
	mLastNotAppeneded=0;
	if(xmFile.IsOpen())
	{
	u32 size=xmFile.GetSize();
	mModFileMem=new u8[size];
	xmFile.Read(mModFileMem,1,size);
	mSampleDataSize = (4410022)5; //44100 samples a second, 2 channels, 16 bits a sample seconds.
	mSampleData=new u16[mSampleDataSize];
	mModFile=ModPlug_Load(mModFileMem, size);
	}else
	{
	std::cout << "XM track " << xmFile.GetActualFileName() << " is not open" << std::endl;
	}
	}

	XMAudioSource::~XMAudioSource()
	{
	ModPlug_Unload(mModFile);
	delete [] mModFileMem;
	delete [] mSampleData;
	}

	void XMAudioSource::Restart()
	{
	if(mModFile)
	{
	ModPlug_Seek(mModFile,0);
	}
	}

	u32 XMAudioSource::GetSampleRate()
	{
	if(mModFile)
	{
	ModPlug_Settings settings;
	ModPlug_GetSettings(&settings);
	return settings.mFrequency;
	}
	return 0;
	}

	u32 XMAudioSource::GetBitDepth()
	{
	if(mModFile)
	{
	ModPlug_Settings settings;
	ModPlug_GetSettings(&settings);
	return settings.mBits;
	}
	return 0;
	}

	Seconds XMAudioSource::GetLength()
	{
	f32 l=0;
	if(mModFile)
	{
	//Get the length of the mod, in milliseconds
	l=static_cast<f32>(ModPlug_GetLength(mModFile));
	//Convert the length to seconds.
	l/=1000.0f;
	}
	return Seconds(l);
	}

	u32 XMAudioSource::GetNumChannels()
	{
	if(mModFile)
	{
	ModPlug_Settings settings;
	ModPlug_GetSettings(&settings);
	return settings.mChannels;
	}
	return 1;
	}

	u32 XMAudioSource::UpdateBuffer(AudioBuffer& buffer, u32 numBytesToRead)
	{
	if(mModFile)
	{
	u32 readSize = std::min(numBytesToRead, mSampleDataSize);
	//Normal stream operation.
	ModPlug_Read(mModFile, &(mSampleData[mLastNotAppeneded]), readSize-mLastNotAppeneded);
	u32 bytesRead = buffer.Append(mSampleData,readSize);
	//The number of bytes not appended is the requested amount minus the amount read.
	mLastNotAppeneded=numBytesToRead-bytesRead;
	return bytesRead;
	}
	return 0;
	}
	}

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