Method Update

source/SSI263.cpp:426–738

Called by: . PeriodicUpdate()

// Called by:
// . PeriodicUpdate()
void SSI263::Update(void)
{
	if (!IsPhonemeActive())
		return;

	if (!SSI263SingleVoice.lpDSBvoice || !SSI263SingleVoice.bActive)
	{
		if (!DSInit())
			return;
	}

	UpdateAccurateLength();

	if (g_bFullSpeed)	// NB. if true, then it's irrespective of IsPhonemeActive() - see MockingboardCard::IsActiveToPreventFullSpeed()
	{
		if (m_phonemeLengthRemaining)
		{
			// Willy Byte does SSI263 detection with drive motor on
			m_phonemeLengthRemaining = 0;
#if LOG_SSI263 || LOG_SSI263B || LOG_SC01
			if (m_dbgFirst) LogOutput("1st phoneme short-circuited by fullspeed\n");
#endif

			if (m_phonemeAccurateLengthRemaining)
				m_phonemeCompleteByFullSpeed = true;	// Let UpdateAccurateLength() call UpdateIRQ()
			else
				UpdateIRQ();
		}

		m_updateWasFullSpeed = true;
		return;
	}

	//

	const bool nowNormalSpeed = m_updateWasFullSpeed;	// Just transitioned from full-speed to normal speed
	m_updateWasFullSpeed = false;

	// NB. next call to this function: nowNormalSpeed = false
	if (nowNormalSpeed)
		m_byteOffset = (uint32_t)-1;	// ...which resets m_numSamplesError below

	//-------------

	DWORD dwCurrentPlayCursor, dwCurrentWriteCursor;
	HRESULT hr = SSI263SingleVoice.lpDSBvoice->GetCurrentPosition(&dwCurrentPlayCursor, &dwCurrentWriteCursor);
	if (FAILED(hr))
	{
		LogOutput("SSI263::Update() early return: GetCurrentPosition() failed\n");
		return;
	}

	bool prefillBufferOnInit = false;

	if (m_byteOffset == (uint32_t)-1)
	{
		// First time in this func (or transitioned from full-speed to normal speed, or a ring-buffer reset)
#ifdef DBG_SSI263_UPDATE