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pluginobjects.cpp
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pluginobjects.cpp
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#include "pluginconstants.h"
// This file contains the object implementations for the objects declared in
// "pluginconstants.h"
//
// Note about Helper Objects: DO NOT MODIFY THESE OBJECTS. If you need to do so,
// create a derived class and modify it. These objects may be updated from time to
// time so they need to be left alone.
// CEnvelopeDetector Implementation ----------------------------------------------------------------
//
CEnvelopeDetector::CEnvelopeDetector(void)
{
m_fAttackTime_mSec = 0.0;
m_fReleaseTime_mSec = 0.0;
m_fAttackTime = 0.0;
m_fReleaseTime = 0.0;
m_fSampleRate = 44100;
m_fEnvelope = 0.0;
m_uDetectMode = 0;
m_nSample = 0;
m_bAnalogTC = false;
m_bLogDetector = false;
}
CEnvelopeDetector::~CEnvelopeDetector(void)
{
}
void CEnvelopeDetector::prepareForPlay()
{
m_fEnvelope = 0.0;
m_nSample = 0;
}
void CEnvelopeDetector::init(float samplerate, float attack_in_ms, float release_in_ms, bool bAnalogTC, UINT uDetect, bool bLogDetector)
{
m_fEnvelope = 0.0;
m_fSampleRate = samplerate;
m_bAnalogTC = bAnalogTC;
m_fAttackTime_mSec = attack_in_ms;
m_fReleaseTime_mSec = release_in_ms;
m_uDetectMode = uDetect;
m_bLogDetector = bLogDetector;
// set themm_uDetectMode = uDetect;
setAttackTime(attack_in_ms);
setReleaseTime(release_in_ms);
}
void CEnvelopeDetector::setAttackTime(float attack_in_ms)
{
m_fAttackTime_mSec = attack_in_ms;
if(m_bAnalogTC)
m_fAttackTime = exp(ANALOG_TC/( attack_in_ms * m_fSampleRate * 0.001));
else
m_fAttackTime = exp(DIGITAL_TC/( attack_in_ms * m_fSampleRate * 0.001));
}
void CEnvelopeDetector::setReleaseTime(float release_in_ms)
{
m_fReleaseTime_mSec = release_in_ms;
if(m_bAnalogTC)
m_fReleaseTime = exp(ANALOG_TC/( release_in_ms * m_fSampleRate * 0.001));
else
m_fReleaseTime = exp(DIGITAL_TC/( release_in_ms * m_fSampleRate * 0.001));
}
void CEnvelopeDetector::setTCModeAnalog(bool bAnalogTC)
{
m_bAnalogTC = bAnalogTC;
setAttackTime(m_fAttackTime_mSec);
setReleaseTime(m_fReleaseTime_mSec);
}
float CEnvelopeDetector::detect(float fInput)
{
switch(m_uDetectMode)
{
case 0:
fInput = fabs(fInput);
break;
case 1:
fInput = fabs(fInput) * fabs(fInput);
break;
case 2:
fInput = pow((float)fabs(fInput) * (float)fabs(fInput), (float)0.5);
break;
default:
fInput = (float)fabs(fInput);
break;
}
float fOld = m_fEnvelope;
if(fInput> m_fEnvelope)
m_fEnvelope = m_fAttackTime * (m_fEnvelope - fInput) + fInput;
else
m_fEnvelope = m_fReleaseTime * (m_fEnvelope - fInput) + fInput;
if(m_fEnvelope > 0.0 && m_fEnvelope < FLT_MIN_PLUS) m_fEnvelope = 0;
if(m_fEnvelope < 0.0 && m_fEnvelope > FLT_MIN_MINUS) m_fEnvelope = 0;
// bound them; can happen when using pre-detector gains of more than 1.0
m_fEnvelope = min(m_fEnvelope, 1.0);
m_fEnvelope = max(m_fEnvelope, 0.0);
//16-bit scaling!
if(m_bLogDetector)
{
if(m_fEnvelope <= 0)
return -96.0; // 16 bit noise floor
return 20*log10 (m_fEnvelope);
}
return m_fEnvelope;
}
// CWaveTable Implementation ----------------------------------------------------------------
//
CWaveTable::CWaveTable()
{
// non inveting unless user sets it
m_bInvert = false;
// slope and y-intercept values for the
// Triangle Wave
// rising edge1:
float mt1 = 1.0/256.0;
float bt1 = 0.0;
// rising edge2:
float mt2 = 1.0/256.0;
float bt2 = -1.0;
// falling edge:
float mtf2 = -2.0/512.0;
float btf2 = +1.0;
// Sawtooth
// rising edge1:
float ms1 = 1.0/512.0;
float bs1 = 0.0;
// rising edge2:
float ms2 = 1.0/512.0;
float bs2 = -1.0;
float fMaxTri = 0;
float fMaxSaw = 0;
float fMaxSqr = 0;
// setup arrays
for(int i = 0; i < 1024; i++)
{
// sample the sinusoid, 1024 points
// sin(wnT) = sin(2pi*i/1024)
m_SinArray[i] = sin( ((float)i/1024.0)*(2*pi) );
// saw, triangle and square are just logic mechanisms
// can you figure them out?
// Sawtooth
m_SawtoothArray[i] = i < 512 ? ms1*i + bs1 : ms2*(i-511) + bs2;
// Triangle
if(i < 256)
m_TriangleArray[i] = mt1*i + bt1; // mx + b; rising edge 1
else if (i >= 256 && i < 768)
m_TriangleArray[i] = mtf2*(i-256) + btf2; // mx + b; falling edge
else
m_TriangleArray[i] = mt2*(i-768) + bt2; // mx + b; rising edge 2
// square
m_SquareArray[i] = i < 512 ? +1.0 : -1.0;
// zero to start, then loops build the rest
m_SawtoothArray_BL5[i] = 0.0;
m_SquareArray_BL5[i] = 0.0;
m_TriangleArray_BL5[i] = 0.0;
// sawtooth: += (-1)^g+1(1/g)sin(wnT)
for(int g=1; g<=6; g++)
{
double n = double(g);
m_SawtoothArray_BL5[i] += pow((float)-1.0,(float)(g+1))*(1.0/n)*sin(2.0*pi*i*n/1024.0);
// down saw m_SawtoothArray_BL5[i] += (1.0/n)*sin(2.0*pi*i*n/1024.0);
}
// triangle: += (-1)^g(1/(2g+1+^2)sin(w(2n+1)T)
for(int g=0; g<=3; g++)
{
double n = double(g);
m_TriangleArray_BL5[i] += pow((float)-1.0, (float)n)*(1.0/pow((float)(2*n + 1), (float)2.0))*sin(2.0*pi*(2.0*n + 1)*i/1024.0);
}
// square: += (1/g)sin(wnT)
for(int g=1; g<8; g+=2)
{
double n = double(g);
m_SquareArray_BL5[i] += (1.0/n)*sin(2.0*pi*i*n/1024.0);
}
// store the max values
if(i == 0)
{
fMaxSaw = m_SawtoothArray_BL5[i];
fMaxTri = m_TriangleArray_BL5[i];
fMaxSqr = m_SquareArray_BL5[i];
}
else
{
// test and store
if(m_SawtoothArray_BL5[i] > fMaxSaw)
fMaxSaw = m_SawtoothArray_BL5[i];
if(m_TriangleArray_BL5[i] > fMaxTri)
fMaxTri = m_TriangleArray_BL5[i];
if(m_SquareArray_BL5[i] > fMaxSqr)
fMaxSqr = m_SquareArray_BL5[i];
}
}
// normalize the bandlimited tables
for(int i = 0; i < 1024; i++)
{
// normalize it
m_SawtoothArray_BL5[i] /= fMaxSaw;
m_TriangleArray_BL5[i] /= fMaxTri;
m_SquareArray_BL5[i] /= fMaxSqr;
}
// clear variables
m_fReadIndex = 0.0;
m_fQuadPhaseReadIndex = 0.0;
m_f_inc = 0.0;
// initialize inc
reset();
m_fFrequency_Hz = 440;
m_uOscType = 0;
m_uTableMode = 0;
m_uPolarity = 0;
cookFrequency();
}
/* destructor()
Destroy variables allocated in the contructor()
*/
CWaveTable::~CWaveTable(void)
{
}
/* prepareForPlay()
Called by the client after Play() is initiated but before audio streams
NOTE: if you allocte memory in this function, destroy it in ::destructor() above
*/
bool CWaveTable::prepareForPlay()
{
// reset the index
reset();
// cook curent frequency
cookFrequency();
return true;
}
// The Oscillate Function!
void CWaveTable::doOscillate(float* pYn, float* pYqn)
{
// our output value for this cycle
float fOutSample = 0;
float fQuadPhaseOutSample = 0;
// get INT part
int nReadIndex = (int)m_fReadIndex;
int nQuadPhaseReadIndex = (int)m_fQuadPhaseReadIndex;
// get FRAC part
float fFrac = m_fReadIndex - nReadIndex;
float fQuadFrac = m_fQuadPhaseReadIndex - nQuadPhaseReadIndex;
// setup second index for interpolation; wrap the buffer if needed
int nReadIndexNext = nReadIndex + 1 > 1023 ? 0 : nReadIndex + 1;
int nQuadPhaseReadIndexNext = nQuadPhaseReadIndex + 1 > 1023 ? 0 : nQuadPhaseReadIndex + 1;
// interpolate the output
switch(m_uOscType)
{
case sine:
fOutSample = dLinTerp(0, 1, m_SinArray[nReadIndex], m_SinArray[nReadIndexNext], fFrac);
fQuadPhaseOutSample = dLinTerp(0, 1, m_SinArray[nQuadPhaseReadIndex], m_SinArray[nQuadPhaseReadIndexNext], fQuadFrac);
break;
case saw:
if(m_uTableMode == normal) // normal
{
fOutSample = dLinTerp(0, 1, m_SawtoothArray[nReadIndex], m_SawtoothArray[nReadIndexNext], fFrac);
fQuadPhaseOutSample = dLinTerp(0, 1, m_SawtoothArray[nQuadPhaseReadIndex], m_SawtoothArray[nQuadPhaseReadIndexNext], fQuadFrac);
}
else // bandlimited
{
fOutSample = dLinTerp(0, 1, m_SawtoothArray_BL5[nReadIndex], m_SawtoothArray_BL5[nReadIndexNext], fFrac);
fQuadPhaseOutSample = dLinTerp(0, 1, m_SawtoothArray_BL5[nQuadPhaseReadIndex], m_SawtoothArray_BL5[nQuadPhaseReadIndexNext], fQuadFrac);
}
break;
case tri:
if(m_uTableMode == normal) // normal
{
fOutSample = dLinTerp(0, 1, m_TriangleArray[nReadIndex], m_TriangleArray[nReadIndexNext], fFrac);
fQuadPhaseOutSample = dLinTerp(0, 1, m_TriangleArray[nQuadPhaseReadIndex], m_TriangleArray[nQuadPhaseReadIndexNext], fQuadFrac);
}
else // bandlimited
{
fOutSample = dLinTerp(0, 1, m_TriangleArray_BL5[nReadIndex], m_TriangleArray_BL5[nReadIndexNext], fFrac);
fQuadPhaseOutSample = dLinTerp(0, 1, m_TriangleArray_BL5[nQuadPhaseReadIndex], m_TriangleArray_BL5[nQuadPhaseReadIndexNext], fQuadFrac);
}
break;
case square:
if(m_uTableMode == normal) // normal
{
fOutSample = dLinTerp(0, 1, m_SquareArray[nReadIndex], m_SquareArray[nReadIndexNext], fFrac);
fQuadPhaseOutSample = dLinTerp(0, 1, m_SquareArray[nQuadPhaseReadIndex], m_SquareArray[nQuadPhaseReadIndexNext], fQuadFrac);
}
else // bandlimited
{
fOutSample = dLinTerp(0, 1, m_SquareArray_BL5[nReadIndex], m_SquareArray_BL5[nReadIndexNext], fFrac);
fQuadPhaseOutSample = dLinTerp(0, 1, m_SquareArray_BL5[nQuadPhaseReadIndex], m_SquareArray_BL5[nQuadPhaseReadIndexNext], fQuadFrac);
}
break;
// always need a default
default:
fOutSample = dLinTerp(0, 1, m_SinArray[nReadIndex], m_SinArray[nReadIndexNext], fFrac);
fQuadPhaseOutSample = dLinTerp(0, 1, m_SinArray[nQuadPhaseReadIndex], m_SinArray[nQuadPhaseReadIndexNext], fQuadFrac);
break;
}
// add the increment for next time
m_fReadIndex += m_f_inc;
m_fQuadPhaseReadIndex += m_f_inc;
// check for wrap
if(m_fReadIndex >= 1024)
m_fReadIndex = m_fReadIndex - 1024;
if(m_fQuadPhaseReadIndex >= 1024)
m_fQuadPhaseReadIndex = m_fQuadPhaseReadIndex - 1024;
// write out
*pYn = fOutSample;
*pYqn = fQuadPhaseOutSample;
if(m_bInvert)
{
*pYn *= -1.0;
*pYqn *= -1.0;
}
if(m_uPolarity == unipolar)
{
*pYn /= 2.0;
*pYn += 0.5;
*pYqn /= 2.0;
*pYqn += 0.5;
}
}
// CBiQuad Implementation ----------------------------------------------------------------
//
CBiQuad::CBiQuad(void)
{
}
CBiQuad::~CBiQuad(void)
{
}
// CJoystickProgram Implementation ----------------------------------------------------------------
//
CJoystickProgram::CJoystickProgram(float* pJSProgramTable, UINT uMode)
{
m_bRunning = false;
m_uSampleCount = 0;
m_pJSProgramTable = pJSProgramTable;
m_fTimerDurationMSec = 0;
m_nCurrentProgramStep = 0;
m_fA_Mix = 0.25;
m_fB_Mix = 0.25;
m_fC_Mix = 0.25;
m_fD_Mix = 0.25;
m_fAC_Mix = 0.0;
m_fBD_Mix = 0.0;
m_uJSMode = uMode;
m_bDirInc = true;
}
void CJoystickProgram::setJSMode(UINT uMode)
{
m_uJSMode = uMode;
m_bDirInc = true;
}
void CJoystickProgram::setSampleRate(int nSampleRate)
{
m_fSampleRate = (float)nSampleRate;
}
CJoystickProgram::~CJoystickProgram(void)
{
}
void CJoystickProgram::incTimer()
{
if(!m_bRunning)
return;
m_uSampleCount++;
calculateCurrentVectorMix();
if(m_uSampleCount > (UINT)m_nTimerDurationSamples)
{
// goto the next step
if(m_bDirInc)
m_nCurrentProgramStep++;
else
m_nCurrentProgramStep--;
if(m_nCurrentProgramStep > m_nNumSteps || m_nCurrentProgramStep < 0)
{
if(m_uJSMode == JS_ONESHOT)
{
reset();
return;
}
else if(m_uJSMode == JS_LOOP)
{
m_nCurrentProgramStep = 0;
}
else if(m_uJSMode == JS_LOOP_BACKANDFORTH)
{
m_bDirInc = !m_bDirInc;
if(m_bDirInc)
m_nCurrentProgramStep +=2;
else
m_nCurrentProgramStep -= 2;
}
else if(m_uJSMode == JS_SUSTAIN)
{
m_bRunning = false;
return; // just return
}
}
else if(m_uJSMode == JS_SUSTAIN && m_nCurrentProgramStep == m_nNumSteps)
{
pauseProgram(); // until user restarts with a note-off event
}
// setup for next step
m_uSampleCount = 0;
m_fStartA_Mix = m_fEndA_Mix;
m_fStartB_Mix = m_fEndB_Mix;
m_fStartC_Mix = m_fEndC_Mix;
m_fStartD_Mix = m_fEndD_Mix;
m_fStartAC_Mix = m_fEndAC_Mix;
m_fStartBD_Mix = m_fEndBD_Mix;
m_fEndA_Mix = m_pJSProgramTable[JS_PROG_INDEX(m_nCurrentProgramStep,0)];
m_fEndB_Mix = m_pJSProgramTable[JS_PROG_INDEX(m_nCurrentProgramStep,1)];
m_fEndC_Mix = m_pJSProgramTable[JS_PROG_INDEX(m_nCurrentProgramStep,2)];
m_fEndD_Mix = m_pJSProgramTable[JS_PROG_INDEX(m_nCurrentProgramStep,3)];
m_fEndAC_Mix = m_pJSProgramTable[JS_PROG_INDEX(m_nCurrentProgramStep,5)];
m_fEndBD_Mix = m_pJSProgramTable[JS_PROG_INDEX(m_nCurrentProgramStep,6)];
if(m_bDirInc)
m_fTimerDurationMSec = m_nCurrentProgramStep > 0 ? m_pJSProgramTable[JS_PROG_INDEX(m_nCurrentProgramStep-1,4)] : m_pJSProgramTable[JS_PROG_INDEX(m_nNumSteps,4)];
else
m_fTimerDurationMSec = m_pJSProgramTable[JS_PROG_INDEX(m_nCurrentProgramStep,4)];
m_nTimerDurationSamples = (int)((m_fTimerDurationMSec/1000.0)*(m_fSampleRate));
}
}
void CJoystickProgram::calculateCurrentVectorMix()
{
float m = (m_fEndA_Mix - m_fStartA_Mix)/(float)m_nTimerDurationSamples;
m_fA_Mix = m*(float)m_uSampleCount + m_fStartA_Mix;
m = (m_fEndB_Mix - m_fStartB_Mix)/(float)m_nTimerDurationSamples;
m_fB_Mix = m*(float)m_uSampleCount + m_fStartB_Mix;
m = (m_fEndC_Mix - m_fStartC_Mix)/(float)m_nTimerDurationSamples;
m_fC_Mix = m*(float)m_uSampleCount + m_fStartC_Mix;
m = (m_fEndD_Mix - m_fStartD_Mix)/(float)m_nTimerDurationSamples;
m_fD_Mix = m*(float)m_uSampleCount + m_fStartD_Mix;
m = (m_fEndAC_Mix - m_fStartAC_Mix)/(float)m_nTimerDurationSamples;
m_fAC_Mix = m*(float)m_uSampleCount + m_fStartAC_Mix;
m = (m_fEndBD_Mix - m_fStartBD_Mix)/(float)m_nTimerDurationSamples;
m_fBD_Mix = m*(float)m_uSampleCount + m_fStartBD_Mix;
}
void CJoystickProgram::startProgram()
{
m_nNumSteps = 0;
for(int i=1; i<MAX_JS_PROGRAM_STEPS; i++)
{
if(m_pJSProgramTable[JS_PROG_INDEX(i,4)] > 0)
m_nNumSteps++;
}
if(m_nNumSteps == 0)
return;
m_bDirInc = true;
m_nCurrentProgramStep = 1;
m_fStartA_Mix = m_pJSProgramTable[JS_PROG_INDEX(0,0)];
m_fStartB_Mix = m_pJSProgramTable[JS_PROG_INDEX(0,1)];
m_fStartC_Mix = m_pJSProgramTable[JS_PROG_INDEX(0,2)];
m_fStartD_Mix = m_pJSProgramTable[JS_PROG_INDEX(0,3)];
m_fStartAC_Mix = m_pJSProgramTable[JS_PROG_INDEX(0,5)];
m_fStartBD_Mix = m_pJSProgramTable[JS_PROG_INDEX(0,6)];
m_fEndA_Mix = m_pJSProgramTable[JS_PROG_INDEX(1,0)];
m_fEndB_Mix = m_pJSProgramTable[JS_PROG_INDEX(1,1)];
m_fEndC_Mix = m_pJSProgramTable[JS_PROG_INDEX(1,2)];
m_fEndD_Mix = m_pJSProgramTable[JS_PROG_INDEX(1,3)];
m_fEndAC_Mix = m_pJSProgramTable[JS_PROG_INDEX(1,5)];
m_fEndBD_Mix = m_pJSProgramTable[JS_PROG_INDEX(1,6)];
m_fTimerDurationMSec = m_pJSProgramTable[JS_PROG_INDEX(0,4)];
m_nTimerDurationSamples = (int)((m_fTimerDurationMSec/1000.0)*(m_fSampleRate));
m_bRunning = true;
}
// CWaveData Implementation ----------------------------------------------------------------
//
#if defined _WINDOWS || defined _WINDLL
typedef struct {
UCHAR IdentifierString[4];
DWORD dwLength;
} RIFF_CHUNK, *PRIFF_CHUNK;
typedef struct {
WORD wFormatTag; // Format category
WORD wChannels; // Number of channels
DWORD dwSamplesPerSec; // Sampling rate
DWORD dwAvgBytesPerSec; // For buffer estimation
WORD wBlockAlign; // Data block size
WORD wBitsPerSample;
} WAVE_FILE_HEADER, *PWAVE_FILE_HEADER;
typedef struct _wave_sample {
WAVEFORMATEX WaveFormatEx;
char *pSampleData;
char *pFXSampleData;
UINT Index;
UINT FXIndex;
UINT Size;
DWORD dwId;
DWORD bPlaying;
struct _wave_sample *pNext;
} WAVE_SAMPLE, *PWAVE_SAMPLE;
// union for data conversion
union UWaveData
{
float f;
double d;
int n;
unsigned int u;
unsigned long long u64;
};
// CWaveData
CWaveData::CWaveData(char* pFilePath)
{
m_bWaveLoaded = false;
m_pWaveBuffer = NULL;
m_uLoopCount = 0;
m_uLoopStartIndex = 0;
m_uLoopEndIndex = 0;
m_uLoopType = 0;
m_uMIDINote = 0;
m_uMIDIPitchFraction = 0;
m_uSMPTEFormat = 0;
m_uSMPTEOffset = 0;
if(pFilePath)
m_bWaveLoaded = readWaveFile(pFilePath);
}
CWaveData::~CWaveData()
{
if(m_pWaveBuffer)
delete [] m_pWaveBuffer;
}
// prompts with file open dialog, returns TRUE if successfuly
// opened and parsed the file into the member m_pWaveBuffer
bool CWaveData::initWithUserWAVFile(char* pInitDir)
{
OPENFILENAME ofn; // common dialog box structure
char szFile[260]; // buffer for file name
// open a file name
ZeroMemory( &ofn , sizeof( ofn));
ofn.lStructSize = sizeof ( ofn );
ofn.hwndOwner = NULL ;
ofn.lpstrFile = szFile ;
ofn.lpstrFile[0] = '\0';
ofn.nMaxFile = sizeof(szFile);
ofn.lpstrFilter = "Wave\0*.WAV\0";
ofn.nFilterIndex =1;
ofn.lpstrFileTitle = NULL ;
ofn.nMaxFileTitle = 0 ;
ofn.lpstrInitialDir=pInitDir ; // you can default to a directory here
ofn.Flags = OFN_PATHMUSTEXIST|OFN_FILEMUSTEXIST ;
GetOpenFileName( &ofn );
if(!ofn.lpstrFile)
return false;
m_bWaveLoaded = readWaveFile(ofn.lpstrFile);
//// Now simply display the file name
// MessageBox ( NULL , ofn.lpstrFile , "File Name" , MB_OK);
return m_bWaveLoaded;
}
// THE FOLLOWING TYPES ARE SUPPORTED:
//
// WAVE_FORMAT_PCM and WAVE_FORMAT_EXTENSIBLE
//
// 16-BIT Signed Integer PCM
// 24-BIT Signed Integer PCM 3-ByteAlign
// 24-BIT Signed Integer PCM 4-ByteAlign
// 32-BIT Signed Integer PCM
// 32-BIT Floating Point
// 64-BIT Floating Point
bool CWaveData::readWaveFile(char* pFilePath)
{
bool bSampleLoaded = false;
RIFF_CHUNK RiffChunk = {0};
DWORD dwBytes, dwReturnValue;
WAVE_FILE_HEADER WaveFileHeader;
DWORD dwIncrementBytes;
WAVE_SAMPLE WaveSample;
m_uNumChannels = 0;
m_uSampleRate = 0;
m_uSampleCount = 0;
if(m_hFile = CreateFile(pFilePath, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL))
{
if(m_hFile == INVALID_HANDLE_VALUE)
{
m_uLoopType = 0;
m_uLoopCount = 0;
m_uLoopStartIndex = 0;
m_uLoopEndIndex = 0;
m_uMIDINote = 0;
m_uMIDIPitchFraction = 0;
m_uSMPTEFormat = 0;
m_uSMPTEOffset = 0;
char* pMessage = addStrings(pFilePath, " could not be opened for reading!");
MessageBox (NULL , pMessage , "Error" , MB_OK);
delete [] pMessage;
if(m_pWaveBuffer)
delete [] m_pWaveBuffer;
return false;
}
char szIdentifier[5] = {0};
SetFilePointer(m_hFile, 12, NULL, FILE_CURRENT);
ReadFile(m_hFile, &RiffChunk, sizeof(RiffChunk), &dwBytes, NULL);
ReadFile(m_hFile, &WaveFileHeader, sizeof(WaveFileHeader), &dwBytes, NULL);
WaveSample.WaveFormatEx.wFormatTag = WaveFileHeader.wFormatTag;
WaveSample.WaveFormatEx.nChannels = WaveFileHeader.wChannels;
// force eeeet to stereo
// WaveSample.WaveFormatEx.nChannels = 2;
WaveSample.WaveFormatEx.nSamplesPerSec = WaveFileHeader.dwSamplesPerSec;
WaveSample.WaveFormatEx.nAvgBytesPerSec = WaveFileHeader.dwAvgBytesPerSec;
WaveSample.WaveFormatEx.nBlockAlign = WaveFileHeader.wBlockAlign;
WaveSample.WaveFormatEx.wBitsPerSample = WaveFileHeader.wBitsPerSample;
WaveSample.WaveFormatEx.cbSize = 0;
dwIncrementBytes = dwBytes;
do {
// RiffChunk.dwLength - dwIncrementBytes sets the file pointer to position 0 first time through
SetFilePointer(m_hFile, RiffChunk.dwLength - dwIncrementBytes, NULL, FILE_CURRENT);
dwReturnValue = GetLastError();
if(dwReturnValue == 0)
{
dwBytes = ReadFile(m_hFile, &RiffChunk, sizeof(RiffChunk), &dwBytes, NULL);
// this now makes the SetFilePointer advance in RiffChunk.dwLength chunks
// which vary with the type of chunk
dwIncrementBytes = 0;
memcpy(szIdentifier, RiffChunk.IdentifierString, 4);
}
} while(_stricmp(szIdentifier, "data") && dwReturnValue == 0) ;
if(WaveSample.WaveFormatEx.wFormatTag != 1 && WaveSample.WaveFormatEx.wFormatTag != 3)
{
CloseHandle(m_hFile);
return false;
}
// AUDIO DATA CHUNK data
// 16 bit
if(dwReturnValue == 0 && WaveSample.WaveFormatEx.wBitsPerSample == 16)
{
WaveSample.pSampleData = (char *)LocalAlloc(LMEM_ZEROINIT, RiffChunk.dwLength);
WaveSample.Size = RiffChunk.dwLength;
ReadFile(m_hFile, WaveSample.pSampleData, RiffChunk.dwLength, &dwBytes, NULL);
UINT nSampleCount = (float)dwBytes/(float)(WaveSample.WaveFormatEx.wBitsPerSample/8.0);
m_uSampleCount = nSampleCount;
m_uNumChannels = WaveSample.WaveFormatEx.nChannels;
m_uSampleRate = WaveSample.WaveFormatEx.nSamplesPerSec;
if(m_pWaveBuffer)
delete [] m_pWaveBuffer;
m_pWaveBuffer = new float[nSampleCount];
short* pShorts = new short[nSampleCount];
memset(pShorts, 0, nSampleCount*sizeof(short));
int m = 0;
for(UINT i=0; i<nSampleCount; i++)
{
// MSB
pShorts[i] = (unsigned char)WaveSample.pSampleData[m+1];
pShorts[i] <<= 8;
// LSB
short lsb = (unsigned char)WaveSample.pSampleData[m];
// in case top of lsb is bad
lsb &= 0x00FF;
pShorts[i] |= lsb;
m+=2;
}
// convet to float -1.0 -> +1.0
for(UINT i = 0; i < nSampleCount; i++)
{
m_pWaveBuffer[i] = ((float)pShorts[i])/32768.0;
}
delete []pShorts;
LocalFree(WaveSample.pSampleData);
bSampleLoaded = true;
}
// 24 bits
else if(dwReturnValue == 0 && WaveSample.WaveFormatEx.wBitsPerSample == 24)
{
WaveSample.pSampleData = (char *)LocalAlloc(LMEM_ZEROINIT, RiffChunk.dwLength);
WaveSample.Size = RiffChunk.dwLength;
ReadFile(m_hFile, WaveSample.pSampleData, RiffChunk.dwLength, &dwBytes, NULL);
UINT nSampleCount = (float)dwBytes/(float)(WaveSample.WaveFormatEx.wBitsPerSample/8.0);
m_uSampleCount = nSampleCount;
m_uNumChannels = WaveSample.WaveFormatEx.nChannels;
m_uSampleRate = WaveSample.WaveFormatEx.nSamplesPerSec;
if(m_pWaveBuffer)
delete [] m_pWaveBuffer;
// our buffer gets created
m_pWaveBuffer = new float[nSampleCount];
int* pSignedInts = new int[nSampleCount];
memset(pSignedInts, 0, nSampleCount*sizeof(long));
int m = 0;
int mask = 0x000000FF;
// 24-bits in 3-byte packs
if(WaveSample.WaveFormatEx.nBlockAlign/WaveSample.WaveFormatEx.nChannels == 3)
{
for(UINT i=0; i<nSampleCount; i++)
{
// MSB
pSignedInts[i] = (unsigned char)WaveSample.pSampleData[m+2];
pSignedInts[i] <<= 24;
// NSB
int nsb = (int)WaveSample.pSampleData[m+1];
// in case top of nsb is bad
nsb &= mask;
nsb <<= 16;
pSignedInts[i] |= nsb;
// LSB
int lsb = (int)WaveSample.pSampleData[m];
// in case top of lsb is bad
lsb &= mask;
lsb <<= 8;
pSignedInts[i] |= lsb;
m+=3;
}
}
// 24-bits in 4-byte packs
if(WaveSample.WaveFormatEx.nBlockAlign/WaveSample.WaveFormatEx.nChannels == 4)
{
for(UINT i=0; i<nSampleCount; i++)
{
// MSB
pSignedInts[i] = (unsigned char)WaveSample.pSampleData[m+3];
pSignedInts[i] <<= 24;
// NSB
int nsb = (int)WaveSample.pSampleData[m+2];
// in case top of nsb is bad
nsb &= mask;
nsb <<= 16;
pSignedInts[i] |= nsb;
// NSB2
int nsb2 = (int)WaveSample.pSampleData[m+1];
// in case top of nsb is bad
nsb2 &= mask;
nsb2 <<= 8;
pSignedInts[i] |= nsb2;
// LSB
int lsb = (int)WaveSample.pSampleData[m];
// in case top of lsb is bad
lsb &= mask;
pSignedInts[i] |= lsb;
m+=4;
}
}
// convet to float -1.0 -> +1.0
for(UINT i = 0; i < nSampleCount; i++)
{
m_pWaveBuffer[i] = ((float)pSignedInts[i])/2147483648.0; // 2147483648.0 = 1/2 of 2^32
}
delete []pSignedInts;
LocalFree(WaveSample.pSampleData);
bSampleLoaded = true;
}
// 32 bits
else if(dwReturnValue == 0 && WaveSample.WaveFormatEx.wBitsPerSample == 32)
{
WaveSample.pSampleData = (char *)LocalAlloc(LMEM_ZEROINIT, RiffChunk.dwLength);
WaveSample.Size = RiffChunk.dwLength;
ReadFile(m_hFile, WaveSample.pSampleData, RiffChunk.dwLength, &dwBytes, NULL);
UINT nSampleCount = (float)dwBytes/(float)(WaveSample.WaveFormatEx.wBitsPerSample/8.0);
m_uSampleCount = nSampleCount;
m_uNumChannels = WaveSample.WaveFormatEx.nChannels;
m_uSampleRate = WaveSample.WaveFormatEx.nSamplesPerSec;
if(m_pWaveBuffer)
delete [] m_pWaveBuffer;
// our buffer gets created
m_pWaveBuffer = new float[nSampleCount];
if(WaveSample.WaveFormatEx.wFormatTag == 1)
{
int* pSignedInts = new int[nSampleCount];
memset(pSignedInts, 0, nSampleCount*sizeof(int));
int m = 0;
int mask = 0x000000FF;
for(UINT i=0; i<nSampleCount; i++)
{
// MSB
pSignedInts[i] = (unsigned char)WaveSample.pSampleData[m+3];
pSignedInts[i] <<= 24;
// NSB
int nsb = (int)WaveSample.pSampleData[m+2];
// in case top of nsb is bad
nsb &= mask;
nsb <<= 16;
pSignedInts[i] |= nsb;
// NSB2
int nsb2 = (int)WaveSample.pSampleData[m+1];
// in case top of nsb is bad
nsb2 &= mask;
nsb2 <<= 8;
pSignedInts[i] |= nsb2;
// LSB
int lsb = (int)WaveSample.pSampleData[m];
// in case top of lsb is bad
lsb &= mask;
pSignedInts[i] |= lsb;
m+=4;
}
// convet to float -1.0 -> +1.0
for(UINT i = 0; i < nSampleCount; i++)
{
m_pWaveBuffer[i] = ((float)pSignedInts[i])/2147483648.0; // 2147483648.0 = 1/2 of 2^32
}
delete []pSignedInts;
LocalFree(WaveSample.pSampleData);
bSampleLoaded = true;
}
else if(WaveSample.WaveFormatEx.wFormatTag == 3) // float
{
unsigned int* pUSignedInts = new unsigned int[nSampleCount];
memset(pUSignedInts, 0, nSampleCount*sizeof(unsigned int));
int m = 0;
int mask = 0x000000FF;
for(UINT i=0; i<nSampleCount; i++)
{
// MSB
pUSignedInts[i] = (unsigned char)WaveSample.pSampleData[m+3];
pUSignedInts[i] <<= 24;
// NSB
int nsb = (unsigned int)WaveSample.pSampleData[m+2];
// in case top of nsb is bad
nsb &= mask;
nsb <<= 16;
pUSignedInts[i] |= nsb;
// NSB2
int nsb2 = (unsigned int)WaveSample.pSampleData[m+1];
// in case top of nsb is bad
nsb2 &= mask;
nsb2 <<= 8;
pUSignedInts[i] |= nsb2;