Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: Define the IVoiceCodec interface.
//
// $NoKeywords: $
//=============================================================================//
#ifndef IVOICECODEC_H
#define IVOICECODEC_H
#pragma once
#include "interface.h"
#define BYTES_PER_SAMPLE 2
// This interface is for voice codecs to implement.
// Codecs are guaranteed to be called with the exact output from Compress into Decompress (ie:
// data won't be stuck together and sent to Decompress).
// Decompress is not guaranteed to be called in any specific order relative to Compress, but
// Codecs maintain state between calls, so it is best to call Compress with consecutive voice data
// and decompress likewise. If you call it out of order, it will sound wierd.
// In the same vein, calling Decompress twice with the same data is a bad idea since the state will be
// expecting the next block of data, not the same block.
class IVoiceCodec
{
protected:
virtual ~IVoiceCodec() {}
public:
// Initialize the object. The uncompressed format is always 8-bit signed mono.
virtual bool Init( int quality )=0;
// Use this to delete the object.
virtual void Release()=0;
// Compress the voice data.
// pUncompressed - 16-bit signed mono voice data.
// maxCompressedBytes - The length of the pCompressed buffer. Don't exceed this.
// bFinal - Set to true on the last call to Compress (the user stopped talking).
// Some codecs like big block sizes and will hang onto data you give them in Compress calls.
// When you call with bFinal, the codec will give you compressed data no matter what.
// Return the number of bytes you filled into pCompressed.
virtual int Compress(const char *pUncompressed, int nSamples, char *pCompressed, int maxCompressedBytes, bool bFinal)=0;
// Decompress voice data. pUncompressed is 16-bit signed mono.
virtual int Decompress(const char *pCompressed, int compressedBytes, char *pUncompressed, int maxUncompressedBytes)=0;
// Some codecs maintain state between Compress and Decompress calls. This should clear that state.
virtual bool ResetState()=0;
};
#endif // IVOICECODEC_H