bool QTapeView::tapeReadCallback(unsigned int samples)
{
if (m_hTapeWavPcmFile == (HWAVPCMFILE)INVALID_HANDLE_VALUE) return 0;
if (m_okTapeRecording) return 0;
if (samples == 0) return 0;
unsigned int value = 0;
for (unsigned int i = 0; i < samples; i++)
{
value = WavPcmFile_ReadOne((HWAVPCMFILE)m_hTapeWavPcmFile);
}
BOOL result = (value > 0xffffffff / 2);
DWORD wavLength = WavPcmFile_GetLength((HWAVPCMFILE)m_hTapeWavPcmFile);
DWORD wavPos = WavPcmFile_GetPosition((HWAVPCMFILE)m_hTapeWavPcmFile);
if (wavPos >= wavLength) // End of tape
this->stopTape();
int wavFreq = WavPcmFile_GetFrequency((HWAVPCMFILE)m_hTapeWavPcmFile);
if (wavPos - m_dwTapePositionShown > (DWORD)(wavFreq / 6) || !m_okTapePlaying)
{
this->updatePosition();
}
return result;
}
void CALLBACK TapeView_TapeWriteCallback(int value, UINT samples)
{
if (m_hTapeWavPcmFile == (HWAVPCMFILE)INVALID_HANDLE_VALUE) return;
if (!m_okTapeRecording) return;
if (samples == 0) return;
// Scroll buffer
memmove(m_TapeBuffer, m_TapeBuffer + samples, TAPE_BUFFER_SIZE - samples);
// Write samples to the file
for (UINT i = 0; i < samples; i++)
{
WavPcmFile_WriteOne(m_hTapeWavPcmFile, value);
//TODO: Check WavPcmFile_WriteOne result
*(m_TapeBuffer + TAPE_BUFFER_SIZE - samples + i) = (BYTE)((value >> 24) & 0xff);
}
InvalidateRect(m_hwndTapeGraph, NULL, FALSE);
DWORD wavPos = WavPcmFile_GetPosition(m_hTapeWavPcmFile);
int wavFreq = WavPcmFile_GetFrequency(m_hTapeWavPcmFile);
if (wavPos - m_dwTapePositionShown > (DWORD)(wavFreq / 6) || !m_okTapePlaying)
{
TapeView_UpdatePosition();
}
}
// Tape emulator callback used to read a tape recorded data.
// Input:
// samples Number of samples to play.
// Output:
// result Bit to put in tape input port.
BOOL CALLBACK TapeView_TapeReadCallback(unsigned int samples)
{
if (samples == 0) return 0;
// Scroll buffer
memmove(m_TapeBuffer, m_TapeBuffer + samples, TAPE_BUFFER_SIZE - samples);
UINT value = 0;
for (UINT i = 0; i < samples; i++)
{
value = WavPcmFile_ReadOne(m_hTapeWavPcmFile);
*(m_TapeBuffer + TAPE_BUFFER_SIZE - samples + i) = (BYTE)((value >> 24) & 0xff);
}
BOOL result = (value >= UINT_MAX / 2);
InvalidateRect(m_hwndTapeGraph, NULL, FALSE);
DWORD wavLength = WavPcmFile_GetLength(m_hTapeWavPcmFile);
DWORD wavPos = WavPcmFile_GetPosition(m_hTapeWavPcmFile);
if (wavPos >= wavLength) // End of tape
TapeView_StopTape();
int wavFreq = WavPcmFile_GetFrequency(m_hTapeWavPcmFile);
if (wavPos - m_dwTapePositionShown > (DWORD)(wavFreq / 6) || !m_okTapePlaying)
{
TapeView_UpdatePosition();
}
//#if !defined(PRODUCT)
// DebugPrintFormat(_T("Tape: %d\r\n"), result);
//#endif
return result;
}
void QTapeView::updatePosition()
{
DWORD wavPos = WavPcmFile_GetPosition((HWAVPCMFILE)m_hTapeWavPcmFile);
int wavFreq = WavPcmFile_GetFrequency((HWAVPCMFILE)m_hTapeWavPcmFile);
double wavPosSeconds = double(wavPos) / wavFreq;
TCHAR buffer[64];
_sntprintf(buffer, 64, _T("%d:%02d.%02d"),
int(wavPosSeconds) / 60, int(wavPosSeconds) % 60, int(wavPosSeconds * 100) % 100);
m_labelCurrent->setText(buffer);
m_dwTapePositionShown = wavPos;
}
void TapeView_UpdatePosition()
{
DWORD wavPos = WavPcmFile_GetPosition(m_hTapeWavPcmFile);
int wavFreq = WavPcmFile_GetFrequency(m_hTapeWavPcmFile);
double wavPosSeconds = double(wavPos) / wavFreq;
TCHAR buffer[64];
wsprintf(buffer, _T("%d:%02d.%02d"),
int(wavPosSeconds) / 60, int(wavPosSeconds) % 60, int(wavPosSeconds * 100) % 100);
SetWindowText(m_hwndTapeCurrent, buffer);
m_dwTapePositionShown = wavPos;
}
void QTapeView::tapeWriteCallback(int value, unsigned int samples)
{
if (m_hTapeWavPcmFile == (HWAVPCMFILE)INVALID_HANDLE_VALUE) return;
if (!m_okTapeRecording) return;
if (samples == 0) return;
// Write samples to the file
for (unsigned int i = 0; i < samples; i++)
WavPcmFile_WriteOne((HWAVPCMFILE)m_hTapeWavPcmFile, value);
DWORD wavPos = WavPcmFile_GetPosition((HWAVPCMFILE)m_hTapeWavPcmFile);
int wavFreq = WavPcmFile_GetFrequency((HWAVPCMFILE)m_hTapeWavPcmFile);
if (wavPos - m_dwTapePositionShown > (DWORD)(wavFreq / 6) || !m_okTapePlaying)
{
this->updatePosition();
}
}