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62 lines
2.2 KiB
C
62 lines
2.2 KiB
C
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//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose: Define the IVoiceCodec interface.
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//
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// $NoKeywords: $
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//=============================================================================//
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#ifndef IVOICECODEC_H
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#define IVOICECODEC_H
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#pragma once
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#include "interface.h"
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#define BYTES_PER_SAMPLE 2
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// This interface is for voice codecs to implement.
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// Codecs are guaranteed to be called with the exact output from Compress into Decompress (ie:
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// data won't be stuck together and sent to Decompress).
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// Decompress is not guaranteed to be called in any specific order relative to Compress, but
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// Codecs maintain state between calls, so it is best to call Compress with consecutive voice data
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// and decompress likewise. If you call it out of order, it will sound wierd.
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// In the same vein, calling Decompress twice with the same data is a bad idea since the state will be
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// expecting the next block of data, not the same block.
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class IVoiceCodec
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{
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protected:
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virtual ~IVoiceCodec() {}
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public:
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// Initialize the object. The uncompressed format is always 8-bit signed mono.
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virtual bool Init( int quality )=0;
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// Use this to delete the object.
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virtual void Release()=0;
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// Compress the voice data.
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// pUncompressed - 16-bit signed mono voice data.
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// maxCompressedBytes - The length of the pCompressed buffer. Don't exceed this.
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// bFinal - Set to true on the last call to Compress (the user stopped talking).
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// Some codecs like big block sizes and will hang onto data you give them in Compress calls.
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// When you call with bFinal, the codec will give you compressed data no matter what.
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// Return the number of bytes you filled into pCompressed.
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virtual int Compress(const char *pUncompressed, int nSamples, char *pCompressed, int maxCompressedBytes, bool bFinal)=0;
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// Decompress voice data. pUncompressed is 16-bit signed mono.
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virtual int Decompress(const char *pCompressed, int compressedBytes, char *pUncompressed, int maxUncompressedBytes)=0;
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// Some codecs maintain state between Compress and Decompress calls. This should clear that state.
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virtual bool ResetState()=0;
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};
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#endif // IVOICECODEC_H
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