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154 lines
5.0 KiB
154 lines
5.0 KiB
![]()
4 years ago
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//========= Copyright Valve Corporation, All rights reserved. ============//
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/***************************************************************************
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*
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* Copyright (C) 2001 Microsoft Corporation. All Rights Reserved.
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*
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* File: imaadpcm.h
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* Content: IMA ADPCM CODEC.
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* History:
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* Date By Reason
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* ==== == ======
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* 04/29/01 dereks Created.
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*
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****************************************************************************/
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#ifndef __IMAADPCM_H__
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#define __IMAADPCM_H__
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#include <windows.h>
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#include <windowsx.h>
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#include <mmsystem.h>
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#include <ctype.h>
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#include <mmreg.h>
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#include <msacm.h>
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#define XBOX_ADPCM_SAMPLES_PER_BLOCK 64
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#define WAVE_FORMAT_XBOX_ADPCM 0x0069
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#define IMAADPCM_BITS_PER_SAMPLE 4
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#define IMAADPCM_HEADER_LENGTH 4
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#define IMAADPCM_MAX_CHANNELS 2
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#define IMAADPCM_PCM_BITS_PER_SAMPLE 16
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#define NUMELMS(a) (sizeof(a) / sizeof(a[0]))
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typedef const WAVEFORMATEX *LPCWAVEFORMATEX;
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typedef const IMAADPCMWAVEFORMAT *LPCIMAADPCMWAVEFORMAT;
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#ifdef __cplusplus
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//
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// IMA ADPCM encoder function prototype
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//
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typedef BOOL (*LPFNIMAADPCMCONVERT)(LPBYTE pbSrc, LPBYTE pbDst, UINT cBlocks, UINT nBlockAlignment, UINT cSamplesPerBlock, LPINT pnStepIndexL, LPINT pnStepIndexR);
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//
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// Codec mode
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//
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enum CODEC_MODE
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{
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CODEC_MODE_DECODE,
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CODEC_MODE_ENCODE_NORMAL,
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CODEC_MODE_ENCODE_OPTIMIZE_WHOLE_FILE,
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CODEC_MODE_ENCODE_OPTIMIZE_EACH_BLOCK,
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};
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//
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// IMA ADPCM CODEC
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//
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class CImaAdpcmCodec
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{
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private:
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static const short m_asNextStep[16]; // Step increment array
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static const short m_asStep[89]; // Step value array
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IMAADPCMWAVEFORMAT m_wfxEncode; // Encoded format description
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CODEC_MODE m_cmCodecMode; // Codec mode
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int m_nStepIndexL; // Left-channel stepping index
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int m_nStepIndexR; // Right-channel stepping index
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LPFNIMAADPCMCONVERT m_pfnConvert; // Conversion function
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public:
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CImaAdpcmCodec(void);
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~CImaAdpcmCodec(void);
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public:
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// Initialization
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BOOL Initialize(LPCIMAADPCMWAVEFORMAT pwfxEncode, CODEC_MODE cmCodecMode);
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// Size conversions
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WORD GetEncodeAlignment(void);
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WORD GetDecodeAlignment(void);
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WORD GetSourceAlignment(void);
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WORD GetDestinationAlignment(void);
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// Data conversions
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BOOL Convert(LPCVOID pvSrc, LPVOID pvDst, UINT cBlocks);
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void Reset(void);
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// Format descriptions
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static void CreatePcmFormat(WORD nChannels, DWORD nSamplesPerSec, LPWAVEFORMATEX pwfxFormat);
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static void CreateImaAdpcmFormat(WORD nChannels, DWORD nSamplesPerSec, WORD nSamplesPerBlock, LPIMAADPCMWAVEFORMAT pwfxFormat);
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static BOOL IsValidPcmFormat(LPCWAVEFORMATEX pwfxFormat);
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static BOOL IsValidImaAdpcmFormat(LPCIMAADPCMWAVEFORMAT pwfxFormat);
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private:
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// En/decoded data alignment
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static WORD CalculateEncodeAlignment(WORD nSamplesPerBlock, WORD nChannels);
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// Data conversion functions
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static BOOL EncodeM16(LPBYTE pbSrc, LPBYTE pbDst, UINT cBlocks, UINT nBlockAlignment, UINT cSamplesPerBlock, LPINT pnStepIndexL, LPINT pnStepIndexR);
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static BOOL EncodeS16(LPBYTE pbSrc, LPBYTE pbDst, UINT cBlocks, UINT nBlockAlignment, UINT cSamplesPerBlock, LPINT pnStepIndexL, LPINT pnStepIndexR);
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static BOOL DecodeM16(LPBYTE pbSrc, LPBYTE pbDst, UINT cBlocks, UINT nBlockAlignment, UINT cSamplesPerBlock, LPINT pnStepIndexL, LPINT pnStepIndexR);
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static BOOL DecodeS16(LPBYTE pbSrc, LPBYTE pbDst, UINT cBlocks, UINT nBlockAlignment, UINT cSamplesPerBlock, LPINT pnStepIndexL, LPINT pnStepIndexR);
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static int EncodeSample(int nInputSample, int *nPredictedSample, int nStepSize);
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static int DecodeSample(int nInputSample, int nPredictedSample, int nStepSize);
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static int NextStepIndex(int nEncodedSample, int nStepIndex);
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static BOOL ValidStepIndex(int nStepIndex);
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/*static ULONGLONG CalcDifference(LPDWORD pvBuffer1, LPDWORD pvBuffer2, DWORD dwLength);*/
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ULONGLONG CalcDifference(LPBYTE pvBuffer1, LPBYTE pvBuffer2, UINT cBlocks, UINT cTotalBlocks, DWORD dwBlockSize);
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};
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__inline WORD CImaAdpcmCodec::GetSourceAlignment(void)
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{
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return ( m_cmCodecMode == CODEC_MODE_DECODE ) ? GetEncodeAlignment() : GetDecodeAlignment();
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}
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__inline WORD CImaAdpcmCodec::GetDestinationAlignment(void)
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{
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return ( m_cmCodecMode == CODEC_MODE_DECODE ) ? GetDecodeAlignment() : GetEncodeAlignment();
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}
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__inline int CImaAdpcmCodec::NextStepIndex(int nEncodedSample, int nStepIndex)
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{
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nStepIndex += m_asNextStep[nEncodedSample];
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if(nStepIndex < 0)
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{
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nStepIndex = 0;
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}
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else if(nStepIndex >= NUMELMS(m_asStep))
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{
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nStepIndex = NUMELMS(m_asStep) - 1;
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}
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return nStepIndex;
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}
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__inline BOOL CImaAdpcmCodec::ValidStepIndex(int nStepIndex)
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{
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return (nStepIndex >= 0) && (nStepIndex < NUMELMS(m_asStep));
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}
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#endif // __cplusplus
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#endif // __IMAADPCM_H__
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