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46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
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#pragma once
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#include "AudioHardwareSA.h"
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class CAEWaveDecoder : public CAEStreamingDecoder
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{
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private:
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unsigned int nDataSize;
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unsigned int nOffsetToData;
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//bool bInitialised;
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struct FormatChunk
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{
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unsigned short audioFormat;
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unsigned short numChannels;
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unsigned int sampleRate;
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unsigned int byteRate;
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unsigned short blockAlign;
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unsigned short bitsPerSample;
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} formatChunk;
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public:
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CAEWaveDecoder(CAEDataStream* stream)
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: CAEStreamingDecoder(stream)
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{}
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virtual bool Initialise() override;
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virtual unsigned int FillBuffer(void* pBuf, unsigned long nLen) override;
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virtual unsigned int GetStreamLengthMs() override
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{ return static_cast<unsigned long long>(nDataSize) * 8000 / (formatChunk.sampleRate*formatChunk.bitsPerSample*formatChunk.numChannels); }
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virtual unsigned int GetStreamPlayTimeMs() override
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{ return static_cast<unsigned long long>(GetStream()->GetCurrentPosition() - nOffsetToData) * 8000 / (formatChunk.sampleRate*formatChunk.bitsPerSample*formatChunk.numChannels); }
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virtual void SetCursor(unsigned int nTime) override
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{ auto nPos = static_cast<unsigned long long>(nTime) * (formatChunk.sampleRate*formatChunk.bitsPerSample*formatChunk.numChannels) / 8000;
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auto nModulo = (formatChunk.numChannels*formatChunk.bitsPerSample/8);
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auto nExtra = nPos % nModulo ? nModulo - (nPos % nModulo) : 0;
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GetStream()->Seek(nOffsetToData + nPos + nExtra, FILE_BEGIN); }
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virtual unsigned int GetSampleRate() override
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{ return formatChunk.sampleRate; }
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virtual unsigned int GetStreamID() override
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{ return GetStream()->GetID(); }
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};
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