ref: c993a538c9021a291763bb24ab0abde774ae1e49
dir: /plugins/aac_acm/codec.cpp/
#include "codec.h"
#include <assert.h>
// we must register these by emailing to mmreg@microsoft.com
const int codec::m_iCompressedFormatTag = 0x1234;
const int codec::m_iManufacturerID = MM_GADGETLABS;
const int codec::m_iProductID = 7;
const wchar_t g_sCodecName[]=L"MPEG-2/4 AAC audio codec";
const wchar_t g_sLongCodecName[]=L"Very special audio codec";
const wchar_t g_sFormatName[]=L"MPEG-2/4 AAC";
codec::codec()
{
}
codec::~codec()
{
}
HRESULT codec::formattag_details(ACMFORMATTAGDETAILSW* lParam1, DWORD lParam2)
{
bool bCompressedFormat;
switch(lParam2)
{
case ACM_FORMATTAGDETAILSF_INDEX:
if(lParam1->dwFormatTagIndex>=2)
return ACMERR_NOTPOSSIBLE;
bCompressedFormat=(lParam1->dwFormatTagIndex==1);
break;
case ACM_FORMATTAGDETAILSF_FORMATTAG:
if(lParam1->dwFormatTag==1)
bCompressedFormat=false;
else if(lParam1->dwFormatTag==m_iCompressedFormatTag)
bCompressedFormat=true;
else
return ACMERR_NOTPOSSIBLE;
case ACM_FORMATTAGDETAILSF_LARGESTSIZE:
bCompressedFormat=true;
break;
default:
return ACMERR_NOTPOSSIBLE;
}
lParam1->cbStruct=sizeof(ACMFORMATTAGDETAILSW);
lParam1->cbFormatSize=bCompressedFormat ? 20 : 16;
lParam1->fdwSupport=ACMDRIVERDETAILS_SUPPORTF_CODEC;
if(bCompressedFormat)
lParam1->cStandardFormats=8; // 44 & 48 khz 16 bit, mono & stereo, 64 & 128 kbps
else
lParam1->cStandardFormats=8; // 44 & 48 khz 8 & 16 bit, mono & stereo
if(bCompressedFormat)
{
wcscpy(lParam1->szFormatTag, g_sFormatName);
lParam1->dwFormatTag=m_iCompressedFormatTag;
}
else
{
wcscpy(lParam1->szFormatTag, L"PCM");
lParam1->dwFormatTag=1;
}
return MMSYSERR_NOERROR;
}
void codec::fill_pcm_format(WAVEFORMATEX* pwfx, int rate, int bits, int channels)
{
pwfx->wFormatTag=1;
pwfx->nSamplesPerSec=rate;
pwfx->wBitsPerSample=bits;
pwfx->nChannels=channels;
pwfx->nAvgBytesPerSec=rate * bits * channels / 8;
pwfx->nBlockAlign=channels * bits / 8;
pwfx->cbSize=0;
}
#define MAIN 0
#define LOW 1
#define SSR 2
#define LTP 3
static unsigned int aacSamplingRates[16] = {
96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050,
16000, 12000, 11025, 8000, 7350, 0, 0, 0
};
void codec::fill_compressed_format(WAVEFORMATEX* pwfx, int rate, int bits, int channels, int bitrate)
{
pwfx->wFormatTag=m_iCompressedFormatTag;
pwfx->nSamplesPerSec=rate;
pwfx->wBitsPerSample=bits;
pwfx->nChannels=channels;
pwfx->nAvgBytesPerSec=bitrate / 8;
pwfx->nBlockAlign=1024;
pwfx->cbSize=2;
unsigned char* ext=(unsigned char*)(&pwfx[1]);
int profile = MAIN;
int samplerate_index=-1;
for(int i=0; i<16; i++)
if(aacSamplingRates[i]==rate)
{
samplerate_index=i;
break;
}
if(samplerate_index<0)
return;
ext[0] = ((profile + 1) << 3) | ((samplerate_index & 0xe) >> 1);
ext[1] = ((samplerate_index & 0x1) << 7) | (channels << 3);
// 960 byte frames not used
}
HRESULT codec::format_details(ACMFORMATDETAILSW* lParam1, DWORD lParam2)
{
lParam1->cbStruct=sizeof(ACMFORMATDETAILSW);
lParam1->szFormat[0]=0;
lParam1->fdwSupport=ACMDRIVERDETAILS_SUPPORTF_CODEC;
if(lParam1->dwFormatTag==1)
{
if(lParam2==ACM_FORMATDETAILSF_INDEX)
{
switch(lParam1->dwFormatIndex)
{
case 0:
fill_pcm_format(lParam1->pwfx, 44100, 16, 1);
break;
case 1:
fill_pcm_format(lParam1->pwfx, 44100, 16, 2);
break;
case 2:
fill_pcm_format(lParam1->pwfx, 44100, 8, 1);
break;
case 3:
fill_pcm_format(lParam1->pwfx, 44100, 8, 2);
break;
case 4:
fill_pcm_format(lParam1->pwfx, 48000, 16, 1);
break;
case 5:
fill_pcm_format(lParam1->pwfx, 48000, 16, 2);
break;
case 6:
fill_pcm_format(lParam1->pwfx, 48000, 8, 1);
break;
case 7:
fill_pcm_format(lParam1->pwfx, 48000, 8, 2);
break;
default:
return ACMERR_NOTPOSSIBLE;
}
}
else if(lParam2==ACM_FORMATDETAILSF_FORMAT)
{
if((lParam1->pwfx->nSamplesPerSec != 44100) && (lParam1->pwfx->nSamplesPerSec != 48000))
return ACMERR_NOTPOSSIBLE;
}
else
return ACMERR_NOTPOSSIBLE;
}
else if(lParam1->dwFormatTag==m_iCompressedFormatTag)
{
if(lParam2==ACM_FORMATDETAILSF_INDEX)
{
switch(lParam1->dwFormatIndex)
{
case 0:
fill_compressed_format(lParam1->pwfx, 44100, 16, 1, 128000);
break;
case 1:
fill_compressed_format(lParam1->pwfx, 44100, 16, 2, 128000);
break;
case 2:
fill_compressed_format(lParam1->pwfx, 44100, 16, 1, 64000);
break;
case 3:
fill_compressed_format(lParam1->pwfx, 44100, 16, 2, 64000);
break;
case 4:
fill_compressed_format(lParam1->pwfx, 48000, 16, 1, 128000);
break;
case 5:
fill_compressed_format(lParam1->pwfx, 48000, 16, 2, 128000);
break;
case 6:
fill_compressed_format(lParam1->pwfx, 48000, 16, 1, 64000);
break;
case 7:
fill_compressed_format(lParam1->pwfx, 48000, 16, 2, 64000);
break;
default:
return ACMERR_NOTPOSSIBLE;
}
}
else if(lParam2==ACM_FORMATDETAILSF_FORMAT)
{
if((lParam1->pwfx->nSamplesPerSec != 44100) && (lParam1->pwfx->nSamplesPerSec != 48000))
return ACMERR_NOTPOSSIBLE;
}
else
return ACMERR_NOTPOSSIBLE;
}
else
return ACMERR_NOTPOSSIBLE;
return MMSYSERR_NOERROR;
}
HRESULT codec::format_suggest(ACMDRVFORMATSUGGEST* pFormat)
{
bool bEncode;
if(pFormat->fdwSuggest & ACM_FORMATSUGGESTF_WFORMATTAG)
{
if((pFormat->pwfxDst->wFormatTag == 1) && (pFormat->pwfxSrc->wFormatTag == m_iCompressedFormatTag))
bEncode=false;
else
if((pFormat->pwfxDst->wFormatTag == m_iCompressedFormatTag) && (pFormat->pwfxSrc->wFormatTag == 1))
bEncode=true;
else
return ACMERR_NOTPOSSIBLE;
}
else
{
if(pFormat->pwfxSrc->wFormatTag == m_iCompressedFormatTag)
{
pFormat->pwfxDst->wFormatTag=1;
bEncode=false;
}
else
if(pFormat->pwfxSrc->wFormatTag == 1)
{
pFormat->pwfxDst->wFormatTag=m_iCompressedFormatTag;
bEncode=true;
}
else
return ACMERR_NOTPOSSIBLE;
}
if(pFormat->fdwSuggest & ACM_FORMATSUGGESTF_NCHANNELS)
{
if(pFormat->pwfxDst->nChannels != pFormat->pwfxSrc->nChannels)
return ACMERR_NOTPOSSIBLE;
}
int iChannels = pFormat->pwfxSrc->nChannels;
if(pFormat->fdwSuggest & ACM_FORMATSUGGESTF_NSAMPLESPERSEC)
{
if(pFormat->pwfxDst->nSamplesPerSec != pFormat->pwfxSrc->nSamplesPerSec)
return ACMERR_NOTPOSSIBLE;
}
int iSamplesPerSec = pFormat->pwfxSrc->nSamplesPerSec;
if(pFormat->fdwSuggest & ACM_FORMATSUGGESTF_WBITSPERSAMPLE)
{
if(pFormat->pwfxDst->wBitsPerSample != pFormat->pwfxSrc->wBitsPerSample)
return ACMERR_NOTPOSSIBLE;
}
int iBitsPerSample = pFormat->pwfxSrc->wBitsPerSample;
if(bEncode)
fill_compressed_format(pFormat->pwfxDst, iSamplesPerSec, iBitsPerSample, iChannels, 128000);
else
fill_pcm_format(pFormat->pwfxDst, iSamplesPerSec, iBitsPerSample, iChannels);
return MMSYSERR_NOERROR;
}
HRESULT codec::details(ACMDRIVERDETAILSW* pDetails)
{
memset(pDetails, 0, sizeof(ACMDRIVERDETAILSW));
pDetails->cbStruct=sizeof(ACMDRIVERDETAILSW);
pDetails->fccType=ACMDRIVERDETAILS_FCCTYPE_AUDIOCODEC;
pDetails->fccComp=ACMDRIVERDETAILS_FCCCOMP_UNDEFINED;
pDetails->wMid=m_iManufacturerID;
pDetails->wPid=m_iProductID;
pDetails->vdwACM=0x3320000;
pDetails->vdwDriver=0x1000000;
pDetails->fdwSupport=ACMDRIVERDETAILS_SUPPORTF_CODEC;
pDetails->cFormatTags=2;
pDetails->cFilterTags=0;
wcscpy(pDetails->szShortName, g_sCodecName);
wcscpy(pDetails->szLongName, g_sLongCodecName);
return MMSYSERR_NOERROR;
}
HRESULT codec::about(DWORD h)
{
if(h==(DWORD)-1)
return MMSYSERR_NOERROR;
MessageBoxW((HWND)h, g_sLongCodecName, L"About", MB_OK);
return MMSYSERR_NOERROR;
}
HRESULT codec::open(ACMDRVSTREAMINSTANCE* pStream)
{
if(pStream->pwfxDst->nChannels != pStream->pwfxSrc->nChannels)
return ACMERR_NOTPOSSIBLE;
if(pStream->pwfxDst->nSamplesPerSec != pStream->pwfxSrc->nSamplesPerSec)
return ACMERR_NOTPOSSIBLE;
bool bDecode = (pStream->pwfxDst->wFormatTag == 1);
if(bDecode)
{
if(pStream->pwfxDst->wBitsPerSample!=16)
return ACMERR_NOTPOSSIBLE;
if(pStream->pwfxSrc->wFormatTag!=m_iCompressedFormatTag)
return ACMERR_NOTPOSSIBLE;
}
else
{
// if(pStream->pwfxSrc->wBitsPerSample!=16)
// return ACMERR_NOTPOSSIBLE;
if(pStream->pwfxDst->wFormatTag!=m_iCompressedFormatTag)
return ACMERR_NOTPOSSIBLE;
if(pStream->pwfxSrc->wFormatTag!=1)
return ACMERR_NOTPOSSIBLE;
}
if(pStream->fdwOpen & ACM_STREAMOPENF_QUERY)
return MMSYSERR_NOERROR;
if(bDecode)
pStream->dwDriver=(DWORD)new decoder(pStream->pwfxSrc);
else
pStream->dwDriver=(DWORD)new encoder(pStream->pwfxSrc, pStream->pwfxDst);
return MMSYSERR_NOERROR;
}
HRESULT codec::prepare(ACMDRVSTREAMINSTANCE* pStream, ACMDRVSTREAMHEADER* pHeader)
{
return MMSYSERR_NOTSUPPORTED;
}
HRESULT codec::reset(ACMDRVSTREAMINSTANCE* pStream)
{
stream* pstr=(stream*)pStream->dwDriver;
return pstr->reset();
}
HRESULT codec::size(ACMDRVSTREAMINSTANCE* pStream, ACMDRVSTREAMSIZE* pSize)
{
stream* pstr=(stream*)pStream->dwDriver;
return pstr->size(pSize);
}
HRESULT codec::unprepare(ACMDRVSTREAMINSTANCE* pStream, ACMDRVSTREAMHEADER* pHeader)
{
return MMSYSERR_NOTSUPPORTED;
}
HRESULT codec::convert(ACMDRVSTREAMINSTANCE* pStream, ACMDRVSTREAMHEADER* pHeader)
{
stream* pstr=(stream*)pStream->dwDriver;
return pstr->convert(pHeader);
}
HRESULT codec::close(ACMDRVSTREAMINSTANCE* pStream)
{
stream* pstr=(stream*)pStream->dwDriver;
delete pstr;
return MMSYSERR_NOERROR;
}
#include "faac.h"
codec::encoder::encoder(WAVEFORMATEX* pF, WAVEFORMATEX* pFDest) : m_sFormat(*pF)
{
m_iOutputBytesPerSec=pFDest->nAvgBytesPerSec;
m_pHandle=faacEncOpen(pF->nSamplesPerSec, pF->nChannels, &m_iInputSamples, &m_iMaxOutputBytes);
faacEncConfiguration conf;
conf.mpegVersion = MPEG4;
conf.aacObjectType = MAIN;
conf.allowMidside = 1;
conf.useLfe = 1;
conf.useTns = 1;
conf.bitRate = m_iOutputBytesPerSec/pFDest->nChannels; // bits/second per channel
conf.bandWidth = 18000; //Hz
conf.outputFormat = 1; // ADTS
faacEncSetConfiguration(m_pHandle, &conf);
}
HRESULT codec::encoder::reset()
{
// fixme (?)
return MMSYSERR_NOERROR;
}
HRESULT codec::encoder::size(ACMDRVSTREAMSIZE* pSize)
{
double dwInputBitRate=m_sFormat.nSamplesPerSec * m_sFormat.wBitsPerSample * m_sFormat.nChannels;
double dwOutputBitRate=m_iOutputBytesPerSec;// kbytes/s
if(pSize->fdwSize == ACM_STREAMSIZEF_SOURCE)
{
if(pSize->cbSrcLength<2*m_iInputSamples)
pSize->cbSrcLength=2*m_iInputSamples;
pSize->cbDstLength = pSize->cbSrcLength * 2 * dwOutputBitRate/dwInputBitRate;
if(pSize->cbDstLength<m_iMaxOutputBytes)
pSize->cbDstLength=m_iMaxOutputBytes;
}
else
{
if(pSize->cbDstLength<m_iMaxOutputBytes)
pSize->cbDstLength=m_iMaxOutputBytes;
pSize->cbSrcLength = pSize->cbDstLength * 2 * dwInputBitRate/dwOutputBitRate;;
if(pSize->cbSrcLength<2*m_iInputSamples)
pSize->cbSrcLength=2*m_iInputSamples;
}
return MMSYSERR_NOERROR;
}
#include <stdio.h>
HRESULT codec::encoder::convert(ACMDRVSTREAMHEADER* pHeader)
{
#if 0
short* pSrc, *pDst;
pSrc=(short*)(pHeader->pbSrc);
pDst=(short*)(pHeader->pbDst);
int iSrc=0, iDst=0;
int block_size=m_sFormat.nChannels * 64;
int samples_to_process=pHeader->cbSrcLength / (2 * block_size);
for(int j=0; j<samples_to_process; j++)
{
if(m_sFormat.nChannels==1)
{
pDst[0]=pSrc[0];
for(int i=1; i<64; i++)
pDst[i]=(int)pSrc[i]-(int)pSrc[i-1];
pSrc+=block_size;
pDst+=block_size;
}
else
{
pDst[0]=pSrc[0];
pDst[1]=pSrc[1];
for(int i=1; i<64; i++)
{
pDst[2*i]=(int)pSrc[2*i]-(int)pSrc[2*i-2];
pDst[2*i+1]=(int)pSrc[2*i+1]-(int)pSrc[2*i-1];
}
pSrc+=block_size;
pDst+=block_size;
}
}
FILE* f=fopen("c:\\enc.log", "ab");
fwrite(pHeader->pbSrc, 2 * block_size * samples_to_process, 1, f);
fclose(f);
f=fopen("c:\\enc2.log", "ab");
fwrite(pHeader->pbDst, 2 * block_size * samples_to_process, 1, f);
fclose(f);
pHeader->cbDstLengthUsed=2 * block_size * samples_to_process;
pHeader->cbSrcLengthUsed=2 * block_size * samples_to_process;
return MMSYSERR_NOERROR;
#else
short* buffer=0;
int length=pHeader->cbSrcLength;
if(m_sFormat.wBitsPerSample!=16)
{
buffer = new short[length];
for(int i=0; i<length; i++)
{
short s=(short)(((unsigned char*)pHeader->pbSrc)[i]);
s-=128;
s*=256;
buffer[i]=s;
}
}
short* pointer = buffer ? buffer : (short*)(pHeader->pbSrc);
pHeader->cbSrcLengthUsed=0;
pHeader->cbDstLengthUsed=0;
while(1)
{
if(length-pHeader->cbSrcLengthUsed<2*m_iInputSamples)
break;
if(pHeader->cbDstLength-pHeader->cbDstLengthUsed<m_iMaxOutputBytes)
break;
int result=faacEncEncode(m_pHandle, pointer+pHeader->cbSrcLengthUsed,
m_iInputSamples,
(short*)(pHeader->pbDst+pHeader->cbDstLengthUsed),
pHeader->cbDstLength-pHeader->cbDstLengthUsed);
if(result<0)
{
reset();
break;
}
pHeader->cbDstLengthUsed+=result;
pHeader->cbSrcLengthUsed+=2*m_iInputSamples;
}
if(buffer)
{
pHeader->cbSrcLengthUsed/=2;
delete[] buffer;
}
return MMSYSERR_NOERROR;
#endif
}
codec::decoder::decoder(WAVEFORMATEX* pF) : m_sFormat(*pF), m_bInitialized(false), m_pCache(0)
{
m_pHandle=faacDecOpen();
}
HRESULT codec::decoder::reset()
{
faacDecClose(m_pHandle);
m_pHandle=faacDecOpen();
m_bInitialized=false;
delete[] m_pCache;
m_pCache=0;
return MMSYSERR_NOERROR;
}
HRESULT codec::decoder::size(ACMDRVSTREAMSIZE* pSize)
{
double dwInputBitRate=m_sFormat.nAvgBytesPerSec;
double dwOutputBitRate=m_sFormat.nSamplesPerSec * m_sFormat.wBitsPerSample * m_sFormat.nChannels;
if(pSize->fdwSize == ACM_STREAMSIZEF_SOURCE)
{
if(pSize->cbSrcLength<768*m_sFormat.nChannels)
pSize->cbSrcLength=768*m_sFormat.nChannels;
pSize->cbDstLength = pSize->cbSrcLength * 2 * dwOutputBitRate/dwInputBitRate;
if(pSize->cbDstLength<4096)
pSize->cbDstLength=4096;
}
else
{
if(pSize->cbDstLength<4096)
pSize->cbDstLength=4096;
pSize->cbSrcLength = pSize->cbDstLength * 2 * dwInputBitRate/dwOutputBitRate;;
if(pSize->cbSrcLength<768*m_sFormat.nChannels)
pSize->cbSrcLength=768*m_sFormat.nChannels;
}
return MMSYSERR_NOERROR;
}
//static int iBytesProcessed=0;
HRESULT codec::decoder::convert(ACMDRVSTREAMHEADER* pHeader)
{
#if 0
short *pSrc, *pDst;
pSrc=(short*)pHeader->pbSrc;
pDst=(short*)pHeader->pbDst;
int iSrc=0, iDst=0;
int block_size=m_sFormat.nChannels * 64;
int samples_to_process=pHeader->cbSrcLength / (2 * block_size);
for(int j=0; j<samples_to_process; j++)
{
if(m_sFormat.nChannels==1)
{
pDst[0]=pSrc[0];
for(int i=1; i<64; i++)
pDst[i]=(int)pSrc[i]+(int)pDst[i-1];
pSrc+=block_size;
pDst+=block_size;
}
else
{
pDst[0]=pSrc[0];
pDst[1]=pSrc[1];
for(int i=1; i<64; i++)
{
pDst[2*i]=(int)pSrc[2*i]+(int)pDst[2*i-2];
pDst[2*i+1]=(int)pSrc[2*i+1]+(int)pDst[2*i-1];
}
pSrc+=block_size;
pDst+=block_size;
}
}
FILE* f=fopen("c:\\dec.log", "ab");
fwrite(pHeader->pbDst, 2 * block_size * samples_to_process, 1, f);
fclose(f);
pHeader->cbDstLengthUsed=2 * block_size * samples_to_process;
pHeader->cbSrcLengthUsed=2 * block_size * samples_to_process;
return MMSYSERR_NOERROR;
#else
// fixme: check fdwConvert contents
const int iMinInputSize = 768*m_sFormat.nChannels;
pHeader->cbSrcLengthUsed=0;
pHeader->cbDstLengthUsed=0;
int decoded_bytes=0;
if(!m_bInitialized)
{
unsigned long samplerate;
unsigned long channels;
//assert(!m_pCache);
// we don't really need this call
// and it is done only because i am not sure if it's necessary for faac functionality
pHeader->cbSrcLengthUsed=faacDecInit(m_pHandle, pHeader->pbSrc, &samplerate, &channels);
m_bInitialized=true;
}
unsigned long bytesconsumed;
unsigned long samples;
if(pHeader->cbDstLength<4096)
goto finish;
int iSrcDataLeft=pHeader->cbSrcLength;
while(m_pCache)
{
int iFillSize = iMinInputSize - m_iCacheSize;
if(iFillSize > iSrcDataLeft)
iFillSize = iSrcDataLeft;
memcpy(&m_pCache[m_iCacheSize], pHeader->pbSrc+pHeader->cbSrcLengthUsed, iFillSize);
m_iCacheSize += iFillSize;
iSrcDataLeft -= iFillSize;
pHeader->cbSrcLengthUsed += iFillSize;
if(m_iCacheSize < iMinInputSize)
goto finish;
int result=faacDecDecode(m_pHandle, m_pCache, &bytesconsumed,
(short*)(pHeader->pbDst+pHeader->cbDstLengthUsed), &samples); // no way to prevent output buffer overrun???
if(result==FAAD_FATAL_ERROR)
{
reset();
goto finish;
}
if(result==FAAD_OK)
pHeader->cbDstLengthUsed+=sizeof(short)*samples;
assert(bytesconsumed <= iMinInputSize);
if(bytesconsumed < iMinInputSize)
memmove(m_pCache, &m_pCache[bytesconsumed], iMinInputSize-bytesconsumed);
m_iCacheSize-=bytesconsumed;
if(m_iCacheSize==0)
{
delete[] m_pCache;
m_pCache=0;
}
}
if(iSrcDataLeft == 0)
goto finish;
if(iSrcDataLeft < iMinInputSize)
{
m_pCache = new unsigned char[iMinInputSize];
memcpy(m_pCache, pHeader->pbSrc + pHeader->cbSrcLengthUsed, iSrcDataLeft);
m_iCacheSize = iSrcDataLeft;
pHeader->cbSrcLengthUsed = pHeader->cbSrcLength;
goto finish;
}
while(iSrcDataLeft>=iMinInputSize)
{
if(pHeader->cbDstLength-pHeader->cbDstLengthUsed<4096)
break;
int result=faacDecDecode(m_pHandle, pHeader->pbSrc+pHeader->cbSrcLengthUsed, &bytesconsumed,
(short*)(pHeader->pbDst+pHeader->cbDstLengthUsed), &samples); // no way to prevent output buffer overrun???
if(result==FAAD_FATAL_ERROR)
{
pHeader->cbSrcLengthUsed=pHeader->cbSrcLength;
reset();
goto finish;
}
if(result==FAAD_OK)
pHeader->cbDstLengthUsed+=sizeof(short)*samples;
pHeader->cbSrcLengthUsed+=bytesconsumed;
iSrcDataLeft-=bytesconsumed;
}
finish:
FILE* f=fopen("c:\\aac_acm.bin", "ab");
fwrite(pHeader->pbSrc, pHeader->cbSrcLengthUsed, 1, f);
fclose(f);
// iBytesProcessed+=pHeader->cbSrcLengthUsed;
return MMSYSERR_NOERROR;
#endif
}