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;
}
// 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;
}