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/*
* This source code is public domain.
*
* Authors: Olivier Lapicque <olivierl@jps.net>
*/
#include "stdafx.h"
#include "sndfile.h"
#ifndef WAVE_FORMAT_EXTENSIBLE
#define WAVE_FORMAT_EXTENSIBLE 0xFFFE
#endif
/////////////////////////////////////////////////////////////
// WAV file support
BOOL CSoundFile::ReadWav(const BYTE *lpStream, DWORD dwMemLength)
//---------------------------------------------------------------
{
DWORD dwMemPos = 0;
WAVEFILEHEADER *phdr = (WAVEFILEHEADER *)lpStream;
WAVEFORMATHEADER *pfmt = (WAVEFORMATHEADER *)(lpStream + sizeof(WAVEFILEHEADER));
if ((!lpStream) || (dwMemLength < (DWORD)sizeof(WAVEFILEHEADER))) return FALSE;
if ((phdr->id_RIFF != IFFID_RIFF) || (phdr->id_WAVE != IFFID_WAVE)
|| (pfmt->id_fmt != IFFID_fmt)) return FALSE;
dwMemPos = sizeof(WAVEFILEHEADER) + 8 + pfmt->hdrlen;
if ((dwMemPos + 8 >= dwMemLength)
|| ((pfmt->format != WAVE_FORMAT_PCM) && (pfmt->format != WAVE_FORMAT_EXTENSIBLE))
|| (pfmt->channels > 4)
|| (!pfmt->channels)
|| (!pfmt->freqHz)
|| (pfmt->bitspersample & 7)
|| (pfmt->bitspersample < 8)
|| (pfmt->bitspersample > 32)) return FALSE;
WAVEDATAHEADER *pdata;
for (;;)
{
pdata = (WAVEDATAHEADER *)(lpStream + dwMemPos);
if (pdata->id_data == IFFID_data) break;
dwMemPos += pdata->length + 8;
if (dwMemPos + 8 >= dwMemLength) return FALSE;
}
m_nType = MOD_TYPE_WAV;
m_nSamples = 0;
m_nInstruments = 0;
m_nChannels = 4;
m_nDefaultSpeed = 8;
m_nDefaultTempo = 125;
m_dwSongFlags |= SONG_LINEARSLIDES; // For no resampling
Order[0] = 0;
Order[1] = 0xFF;
PatternSize[0] = PatternSize[1] = 64;
if ((Patterns[0] = AllocatePattern(64, 4)) == NULL) return TRUE;
if ((Patterns[1] = AllocatePattern(64, 4)) == NULL) return TRUE;
UINT samplesize = (pfmt->channels * pfmt->bitspersample) >> 3;
UINT len = pdata->length, bytelen;
if (dwMemPos + len > dwMemLength - 8) len = dwMemLength - dwMemPos - 8;
len /= samplesize;
bytelen = len;
if (pfmt->bitspersample >= 16) bytelen *= 2;
if (len > MAX_SAMPLE_LENGTH) len = MAX_SAMPLE_LENGTH;
if (!len) return TRUE;
// Setting up module length
DWORD dwTime = ((len * 50) / pfmt->freqHz) + 1;
DWORD framesperrow = (dwTime + 63) / 63;
if (framesperrow < 4) framesperrow = 4;
UINT norders = 1;
while (framesperrow >= 0x20)
{
Order[norders++] = 1;
Order[norders] = 0xFF;
framesperrow = (dwTime + (64 * norders - 1)) / (64 * norders);
if (norders >= MAX_ORDERS-1) break;
}
m_nDefaultSpeed = framesperrow;
for (UINT iChn=0; iChn<4; iChn++)
{
ChnSettings[iChn].nPan = (iChn & 1) ? 256 : 0;
ChnSettings[iChn].nVolume = 64;
ChnSettings[iChn].dwFlags = 0;
}
// Setting up speed command
MODCOMMAND *pcmd = Patterns[0];
pcmd[0].command = CMD_SPEED;
pcmd[0].param = (BYTE)m_nDefaultSpeed;
pcmd[0].note = 5*12+1;
pcmd[0].instr = 1;
pcmd[1].note = pcmd[0].note;
pcmd[1].instr = pcmd[0].instr;
m_nSamples = pfmt->channels;
// Support for Multichannel Wave
for (UINT nChn=0; nChn<m_nSamples; nChn++)
{
MODINSTRUMENT *pins = &Ins[nChn+1];
pcmd[nChn].note = pcmd[0].note;
pcmd[nChn].instr = (BYTE)(nChn+1);
pins->nLength = len;
pins->nC4Speed = pfmt->freqHz;
pins->nVolume = 256;
pins->nPan = 128;
pins->nGlobalVol = 64;
pins->uFlags = (WORD)((pfmt->bitspersample >= 16) ? CHN_16BIT : 0);
pins->uFlags |= CHN_PANNING;
if (m_nSamples > 1)
{
switch(nChn)
{
case 0: pins->nPan = 0; break;
case 1: pins->nPan = 256; break;
case 2: pins->nPan = (WORD)((m_nSamples == 3) ? 128 : 64); pcmd[nChn].command = CMD_S3MCMDEX; pcmd[nChn].param = 0x91; break;
case 3: pins->nPan = 192; pcmd[nChn].command = CMD_S3MCMDEX; pcmd[nChn].param = 0x91; break;
default: pins->nPan = 128; break;
}
}
if ((pins->pSample = AllocateSample(bytelen+8)) == NULL) return TRUE;
if (pfmt->bitspersample >= 16)
{
int slsize = pfmt->bitspersample >> 3;
signed short *p = (signed short *)pins->pSample;
signed char *psrc = (signed char *)(lpStream+dwMemPos+8+nChn*slsize+slsize-2);
for (UINT i=0; i<len; i++)
{
p[i] = *((signed short *)psrc);
psrc += samplesize;
}
p[len+1] = p[len] = p[len-1];
} else
{
signed char *p = (signed char *)pins->pSample;
signed char *psrc = (signed char *)(lpStream+dwMemPos+8+nChn);
for (UINT i=0; i<len; i++)
{
p[i] = (signed char)((*psrc) + 0x80);
psrc += samplesize;
}
p[len+1] = p[len] = p[len-1];
}
}
return TRUE;
}
////////////////////////////////////////////////////////////////////////
// IMA ADPCM Support
#pragma pack(1)
typedef struct IMAADPCMBLOCK
{
WORD sample;
BYTE index;
BYTE Reserved;
} DVI_ADPCMBLOCKHEADER;
#pragma pack()
static const int gIMAUnpackTable[90] =
{
7, 8, 9, 10, 11, 12, 13, 14,
16, 17, 19, 21, 23, 25, 28, 31,
34, 37, 41, 45, 50, 55, 60, 66,
73, 80, 88, 97, 107, 118, 130, 143,
157, 173, 190, 209, 230, 253, 279, 307,
337, 371, 408, 449, 494, 544, 598, 658,
724, 796, 876, 963, 1060, 1166, 1282, 1411,
1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024,
3327, 3660, 4026, 4428, 4871, 5358, 5894, 6484,
7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794,
32767, 0
};
BOOL IMAADPCMUnpack16(signed short *pdest, UINT nLen, LPBYTE psrc, DWORD dwBytes, UINT pkBlkAlign)
//------------------------------------------------------------------------------------------------
{
static const int gIMAIndexTab[8] = { -1, -1, -1, -1, 2, 4, 6, 8 };
UINT nPos;
int value;
if ((nLen < 4) || (!pdest) || (!psrc)
|| (pkBlkAlign < 5) || (pkBlkAlign > dwBytes)) return FALSE;
nPos = 0;
while ((nPos < nLen) && (dwBytes > 4))
{
int nIndex;
value = *((short int *)psrc);
nIndex = psrc[2];
psrc += 4;
dwBytes -= 4;
pdest[nPos++] = (short int)value;
for (UINT i=0; ((i<(pkBlkAlign-4)*2) && (nPos < nLen) && (dwBytes)); i++)
{
BYTE delta;
if (i & 1)
{
delta = (BYTE)(((*(psrc++)) >> 4) & 0x0F);
dwBytes--;
} else
{
delta = (BYTE)((*psrc) & 0x0F);
}
int v = gIMAUnpackTable[nIndex] >> 3;
if (delta & 1) v += gIMAUnpackTable[nIndex] >> 2;
if (delta & 2) v += gIMAUnpackTable[nIndex] >> 1;
if (delta & 4) v += gIMAUnpackTable[nIndex];
if (delta & 8) value -= v; else value += v;
nIndex += gIMAIndexTab[delta & 7];
if (nIndex < 0) nIndex = 0; else
if (nIndex > 88) nIndex = 88;
if (value > 32767) value = 32767; else
if (value < -32768) value = -32768;
pdest[nPos++] = (short int)value;
}
}
return TRUE;
}
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