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Sound refactor #406

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b5621c3
LinuxSoundBuffer: use std::atomic<size_t> for positions.
audetto Jun 6, 2026
9177936
SoundCore: factor write cursor validation to separate function.
audetto Jun 6, 2026
702a7f9
Speaker: introduce Frames <-> Bytes conversion functions.
audetto Jun 6, 2026
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30 changes: 6 additions & 24 deletions source/MockingboardCardManager.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -331,38 +331,20 @@ UINT MockingboardCardManager::GenerateAllSoundData(void)
if (m_byteOffset == (uint32_t)-1)
{
// First time in this func

m_byteOffset = dwCurrentWriteCursor;
}
else
{
// Check that our offset isn't between Play & Write positions

if (dwCurrentWriteCursor > dwCurrentPlayCursor)
{
// |-----PxxxxxW-----|
if ((m_byteOffset > dwCurrentPlayCursor) && (m_byteOffset < dwCurrentWriteCursor))
{
#ifdef DBG_MB_UPDATE
double fTicksSecs = (double)GetTickCount() / 1000.0;
LogOutput("%010.3f: [MBUpdt] PC=%08X, WC=%08X, Diff=%08X, Off=%08X, NS=%08X xxx\n", fTicksSecs, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor - dwCurrentPlayCursor, dwByteOffset, nNumSamples);
#endif
m_byteOffset = dwCurrentWriteCursor;
m_numSamplesError = 0;
}
}
else
if (SoundCore_ValidateAndAlignWriteOffset(m_byteOffset, dwCurrentPlayCursor, dwCurrentWriteCursor))
{
// |xxW----------Pxxx|
if ((m_byteOffset > dwCurrentPlayCursor) || (m_byteOffset < dwCurrentWriteCursor))
{
#ifdef DBG_MB_UPDATE
double fTicksSecs = (double)GetTickCount() / 1000.0;
LogOutput("%010.3f: [MBUpdt] PC=%08X, WC=%08X, Diff=%08X, Off=%08X, NS=%08X XXX\n", fTicksSecs, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor - dwCurrentPlayCursor, dwByteOffset, nNumSamples);
double fTicksSecs = (double)GetTickCount() / 1000.0;
const char* tag = (dwCurrentWriteCursor > dwCurrentPlayCursor) ? "xxx" : "XXX";
LogOutput("%010.3f: [MBUpdt] PC=%08X, WC=%08X, Diff=%08X, Off=%08X, NS=%08X %s\n",
fTicksSecs, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor - dwCurrentPlayCursor, m_byteOffset, nNumSamples, tag);
#endif
m_byteOffset = dwCurrentWriteCursor;
m_numSamplesError = 0;
}
m_numSamplesError = 0;
}
}

Expand Down
32 changes: 8 additions & 24 deletions source/SSI263.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -482,7 +482,8 @@ void SSI263::Update(void)
// First time in this func (or transitioned from full-speed to normal speed, or a ring-buffer reset)
#ifdef DBG_SSI263_UPDATE
double fTicksSecs = (double)GetTickCount() / 1000.0;
LogOutput("%010.3f: [SSUpdtInit%1d]PC=%08X, WC=%08X, Diff=%08X, Off=%08X xxx\n", fTicksSecs, m_device, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor - dwCurrentPlayCursor, m_byteOffset);
LogOutput("%010.3f: [SSUpdtInit%1d]PC=%08X, WC=%08X, Diff=%08X, Off=%08X xxx\n",
fTicksSecs, m_device, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor - dwCurrentPlayCursor, m_byteOffset);
#endif
m_byteOffset = dwCurrentWriteCursor;
m_numSamplesError = 0;
Expand All @@ -491,32 +492,15 @@ void SSI263::Update(void)
else
{
// Check that our offset isn't between Play & Write positions

if (dwCurrentWriteCursor > dwCurrentPlayCursor)
if (SoundCore_ValidateAndAlignWriteOffset(m_byteOffset, dwCurrentPlayCursor, dwCurrentWriteCursor))
{
// |-----PxxxxxW-----|
if ((m_byteOffset > dwCurrentPlayCursor) && (m_byteOffset < dwCurrentWriteCursor))
{
#ifdef DBG_SSI263_UPDATE
double fTicksSecs = (double)GetTickCount() / 1000.0;
LogOutput("%010.3f: [SSUpdt%1d] PC=%08X, WC=%08X, Diff=%08X, Off=%08X xxx\n", fTicksSecs, m_device, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor - dwCurrentPlayCursor, m_byteOffset);
#endif
m_byteOffset = dwCurrentWriteCursor;
m_numSamplesError = 0;
}
}
else
{
// |xxW----------Pxxx|
if ((m_byteOffset > dwCurrentPlayCursor) || (m_byteOffset < dwCurrentWriteCursor))
{
#ifdef DBG_SSI263_UPDATE
double fTicksSecs = (double)GetTickCount() / 1000.0;
LogOutput("%010.3f: [SSUpdt%1d] PC=%08X, WC=%08X, Diff=%08X, Off=%08X XXX\n", fTicksSecs, m_device, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor - dwCurrentPlayCursor, m_byteOffset);
double fTicksSecs = (double)GetTickCount() / 1000.0;
const char* tag = (dwCurrentWriteCursor > dwCurrentPlayCursor) ? "xxx" : "XXX";
LogOutput("%010.3f: [SSUpdt%1d] PC=%08X, WC=%08X, Diff=%08X, Off=%08X %s\n",
fTicksSecs, m_device, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor - dwCurrentPlayCursor, m_byteOffset, tag);
#endif
m_byteOffset = dwCurrentWriteCursor;
m_numSamplesError = 0;
}
m_numSamplesError = 0;
}
}

Expand Down
30 changes: 30 additions & 0 deletions source/SoundCore.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -590,3 +590,33 @@ void SysClk_StopTimer()

g_bRefClockTimerActive = false;
}

bool SoundCore_ValidateAndAlignWriteOffset(
uint32_t& rByteOffset,
DWORD dwCurrentPlayCursor,
DWORD dwCurrentWriteCursor)
{
// Verify that the write offset hasn't drifted into the unsafe hardware playback zone
// (between the play cursor and the write cursor). If it has, align it to the write cursor.
// Returns true if alignment was performed (drift/error detected), false otherwise.
if (dwCurrentWriteCursor > dwCurrentPlayCursor)
{
// |-----PxxxxxW-----|
if ((rByteOffset > dwCurrentPlayCursor) && (rByteOffset < dwCurrentWriteCursor))
{
rByteOffset = dwCurrentWriteCursor;
return true;
}
}
else
{
// |xxW----------Pxxx|
if ((rByteOffset > dwCurrentPlayCursor) || (rByteOffset < dwCurrentWriteCursor))
{
rByteOffset = dwCurrentWriteCursor;
return true;
}
}

return false;
}
7 changes: 7 additions & 0 deletions source/SoundCore.h
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,13 @@ void SoundCore_SetErrorMax(const int nErrorMax);

void SoundCore_StopTimer();

// Returns true if the write offset was in the unsafe zone and had to be aligned to the write cursor.
// Returns false if the write offset was already in a safe zone and did not need alignment.
bool SoundCore_ValidateAndAlignWriteOffset(
uint32_t& rByteOffset,
DWORD dwCurrentPlayCursor,
DWORD dwCurrentWriteCursor);

LONG NewVolume(uint32_t dwVolume, uint32_t dwVolumeMax);

void SysClk_WaitTimer();
Expand Down
108 changes: 40 additions & 68 deletions source/Speaker.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -191,18 +191,28 @@ static void QueueOneFrame(short* dest, UINT& index, short sample_in)
index++;
}

static uint32_t FramesToBytes(uint32_t frames)
{
return frames * sizeof(short) * g_nSPKR_NumChannels;
}

static uint32_t BytesToFrames(uint32_t bytes)
{
return bytes / (sizeof(short) * g_nSPKR_NumChannels);
}

static void PadNFrames(short* dest, uint32_t sizeBytes)
{
if (sizeBytes)
{
const UINT numSamples = sizeBytes / (sizeof(short) * g_nSPKR_NumChannels);
const UINT numFrames = BytesToFrames(sizeBytes);
UINT index = 0;
for (UINT i = 0; i < numSamples; i++)
for (UINT i = 0; i < numFrames; i++)
{
QueueOneFrame(dest, index, g_nSpeakerData);
}
if (g_bSpkrOutputToRiff)
RiffPutSamples(dest, numSamples);
RiffPutSamples(dest, numFrames);
}
}

Expand Down Expand Up @@ -452,7 +462,7 @@ void SpkrUpdate(uint32_t totalcycles)
nSamplesUsed = Spkr_SubmitWaveBuffer(g_pSpeakerBuffer, g_nBufferIdx);

_ASSERT(nSamplesUsed <= g_nBufferIdx);
memmove(g_pSpeakerBuffer, &g_pSpeakerBuffer[nSamplesUsed * g_nSPKR_NumChannels], (g_nBufferIdx - nSamplesUsed) * sizeof(short) * g_nSPKR_NumChannels);
memmove(g_pSpeakerBuffer, &g_pSpeakerBuffer[nSamplesUsed * g_nSPKR_NumChannels], FramesToBytes(g_nBufferIdx - nSamplesUsed));
g_nBufferIdx -= nSamplesUsed;
}

Expand All @@ -465,7 +475,7 @@ void SpkrUpdate_Timer()
nSamplesUsed = Spkr_SubmitWaveBuffer_FullSpeed(g_pSpeakerBuffer, g_nBufferIdx);

_ASSERT(nSamplesUsed <= g_nBufferIdx);
memmove(g_pSpeakerBuffer, &g_pSpeakerBuffer[nSamplesUsed * g_nSPKR_NumChannels], (g_nBufferIdx - nSamplesUsed) * sizeof(short) * g_nSPKR_NumChannels);
memmove(g_pSpeakerBuffer, &g_pSpeakerBuffer[nSamplesUsed * g_nSPKR_NumChannels], FramesToBytes(g_nBufferIdx - nSamplesUsed));
g_nBufferIdx -= nSamplesUsed;
}

Expand Down Expand Up @@ -518,25 +528,7 @@ static ULONG Spkr_SubmitWaveBuffer_FullSpeed(short* pSpeakerBuffer, ULONG nNumSa
else
{
// Check that our offset isn't between Play & Write positions

if(dwCurrentWriteCursor > dwCurrentPlayCursor)
{
// |-----PxxxxxW-----|
if((dwByteOffset > dwCurrentPlayCursor) && (dwByteOffset < dwCurrentWriteCursor))
{
//LogOutput("[Submit_FS] PC=%08X, WC=%08X, Diff=%08X, Off=%08X, NS=%08X xxx\n", dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor-dwCurrentPlayCursor, dwByteOffset, nNumSamples);
dwByteOffset = dwCurrentWriteCursor;
}
}
else
{
// |xxW----------Pxxx|
if((dwByteOffset > dwCurrentPlayCursor) || (dwByteOffset < dwCurrentWriteCursor))
{
//LogOutput("[Submit_FS] PC=%08X, WC=%08X, Diff=%08X, Off=%08X, NS=%08X XXX\n", dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor-dwCurrentPlayCursor, dwByteOffset, nNumSamples);
dwByteOffset = dwCurrentWriteCursor;
}
}
SoundCore_ValidateAndAlignWriteOffset(dwByteOffset, dwCurrentPlayCursor, dwCurrentWriteCursor);
}

// Calc bytes remaining to be played
Expand All @@ -553,7 +545,7 @@ static ULONG Spkr_SubmitWaveBuffer_FullSpeed(short* pSpeakerBuffer, ULONG nNumSa
if(nBytesRemaining < g_dwDSSpkrBufferSize / 4)
{
// < 1/4 of play-buffer remaining (need *more* data)
nNumPadSamples = ((g_dwDSSpkrBufferSize / 4) - nBytesRemaining) / (sizeof(short) * g_nSPKR_NumChannels);
nNumPadSamples = BytesToFrames((g_dwDSSpkrBufferSize / 4) - nBytesRemaining);

if(nNumPadSamples > nNumSamples)
nNumPadSamples -= nNumSamples;
Expand All @@ -568,15 +560,15 @@ static ULONG Spkr_SubmitWaveBuffer_FullSpeed(short* pSpeakerBuffer, ULONG nNumSa
UINT nBytesFree = g_dwDSSpkrBufferSize - nBytesRemaining; // Calc free buffer space
ULONG nNumSamplesToUse = nNumSamples + nNumPadSamples;

if (nNumSamplesToUse * sizeof(short) * g_nSPKR_NumChannels > nBytesFree)
nNumSamplesToUse = nBytesFree / (sizeof(short) * g_nSPKR_NumChannels);
if (FramesToBytes(nNumSamplesToUse) > nBytesFree)
nNumSamplesToUse = BytesToFrames(nBytesFree);

//

if(nNumSamplesToUse >= 128) // Limit the buffer unlock/locking to a minimum
{
hr = DSGetLock(SpeakerVoice.lpDSBvoice,
dwByteOffset, (uint32_t)nNumSamplesToUse * sizeof(short) * g_nSPKR_NumChannels,
dwByteOffset, FramesToBytes(nNumSamplesToUse),
&pDSLockedBuffer0, &dwDSLockedBufferSize0,
&pDSLockedBuffer1, &dwDSLockedBufferSize1);
if (FAILED(hr))
Expand All @@ -591,31 +583,31 @@ static ULONG Spkr_SubmitWaveBuffer_FullSpeed(short* pSpeakerBuffer, ULONG nNumSa
{
//LogOutput("[Submit_FS] C=%08X, PC=%08X, WC=%08X, Diff=%08X, Off=%08X, NS=%08X ***\n", nDbgSpkrCnt, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor-dwCurrentPlayCursor, dwByteOffset, nNumSamples);

if (nNumSamples * sizeof(short) * g_nSPKR_NumChannels <= dwDSLockedBufferSize0)
if (FramesToBytes(nNumSamples) <= dwDSLockedBufferSize0)
{
dwBufferSize0 = nNumSamples * sizeof(short) * g_nSPKR_NumChannels;
dwBufferSize0 = FramesToBytes(nNumSamples);
dwBufferSize1 = 0;
}
else
{
dwBufferSize0 = dwDSLockedBufferSize0;
dwBufferSize1 = nNumSamples * sizeof(short) * g_nSPKR_NumChannels - dwDSLockedBufferSize0;
dwBufferSize1 = FramesToBytes(nNumSamples) - dwDSLockedBufferSize0;

if(dwBufferSize1 > dwDSLockedBufferSize1)
dwBufferSize1 = dwDSLockedBufferSize1;
}

memcpy(pDSLockedBuffer0, &pSpeakerBuffer[0], dwBufferSize0);
if (g_bSpkrOutputToRiff)
RiffPutSamples(pDSLockedBuffer0, dwBufferSize0 / (sizeof(short) * g_nSPKR_NumChannels));
nNumSamples = dwBufferSize0 / (sizeof(short) * g_nSPKR_NumChannels);
RiffPutSamples(pDSLockedBuffer0, BytesToFrames(dwBufferSize0));
nNumSamples = BytesToFrames(dwBufferSize0);

if(pDSLockedBuffer1 && dwBufferSize1)
{
memcpy(pDSLockedBuffer1, &pSpeakerBuffer[dwDSLockedBufferSize0/sizeof(short)], dwBufferSize1);
if (g_bSpkrOutputToRiff)
RiffPutSamples(pDSLockedBuffer1, dwBufferSize1 / (sizeof(short) * g_nSPKR_NumChannels));
nNumSamples += dwBufferSize1 / (sizeof(short) * g_nSPKR_NumChannels);
RiffPutSamples(pDSLockedBuffer1, BytesToFrames(dwBufferSize1));
nNumSamples += BytesToFrames(dwBufferSize1);
}
}

Expand All @@ -636,7 +628,7 @@ static ULONG Spkr_SubmitWaveBuffer_FullSpeed(short* pSpeakerBuffer, ULONG nNumSa
if(FAILED(hr))
return nNumSamples;

dwByteOffset = (dwByteOffset + (uint32_t)nNumSamplesToUse*sizeof(short)*g_nSPKR_NumChannels) % g_dwDSSpkrBufferSize;
dwByteOffset = (dwByteOffset + FramesToBytes(nNumSamplesToUse)) % g_dwDSSpkrBufferSize;
}

return nNumSamples;
Expand Down Expand Up @@ -690,34 +682,14 @@ static ULONG Spkr_SubmitWaveBuffer(short* pSpeakerBuffer, ULONG nNumSamples)
else
{
// Check that our offset isn't between Play & Write positions

if(dwCurrentWriteCursor > dwCurrentPlayCursor)
{
// |-----PxxxxxW-----|
if((dwByteOffset > dwCurrentPlayCursor) && (dwByteOffset < dwCurrentWriteCursor))
{
double fTicksSecs = (double)GetTickCount() / 1000.0;
//LogOutput("%010.3f: [Submit] PC=%08X, WC=%08X, Diff=%08X, Off=%08X, NS=%08X xxx\n", fTicksSecs, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor-dwCurrentPlayCursor, dwByteOffset, nNumSamples);
//LogFileOutput("%010.3f: [Submit] PC=%08X, WC=%08X, Diff=%08X, Off=%08X, NS=%08X xxx\n", fTicksSecs, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor-dwCurrentPlayCursor, dwByteOffset, nNumSamples);

dwByteOffset = dwCurrentWriteCursor;
nNumSamplesError = 0;
bBufferError = true;
}
}
else
if (SoundCore_ValidateAndAlignWriteOffset(dwByteOffset, dwCurrentPlayCursor, dwCurrentWriteCursor))
{
// |xxW----------Pxxx|
if((dwByteOffset > dwCurrentPlayCursor) || (dwByteOffset < dwCurrentWriteCursor))
{
double fTicksSecs = (double)GetTickCount() / 1000.0;
//LogOutput("%010.3f: [Submit] PC=%08X, WC=%08X, Diff=%08X, Off=%08X, NS=%08X XXX\n", fTicksSecs, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor-dwCurrentPlayCursor, dwByteOffset, nNumSamples);
//LogFileOutput("%010.3f: [Submit] PC=%08X, WC=%08X, Diff=%08X, Off=%08X, NS=%08X XXX\n", fTicksSecs, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor-dwCurrentPlayCursor, dwByteOffset, nNumSamples);
//double fTicksSecs = (double)GetTickCount() / 1000.0;
//LogOutput("%010.3f: [Submit] PC=%08X, WC=%08X, Diff=%08X, Off=%08X, NS=%08X xxx\n", fTicksSecs, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor-dwCurrentPlayCursor, dwByteOffset, nNumSamples);
//LogFileOutput("%010.3f: [Submit] PC=%08X, WC=%08X, Diff=%08X, Off=%08X, NS=%08X xxx\n", fTicksSecs, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor-dwCurrentPlayCursor, dwByteOffset, nNumSamples);

dwByteOffset = dwCurrentWriteCursor;
nNumSamplesError = 0;
bBufferError = true;
}
nNumSamplesError = 0;
bBufferError = true;
}
}

Expand Down Expand Up @@ -747,8 +719,8 @@ static ULONG Spkr_SubmitWaveBuffer(short* pSpeakerBuffer, ULONG nNumSamples)
UINT nBytesFree = g_dwDSSpkrBufferSize - nBytesRemaining; // Calc free buffer space
ULONG nNumSamplesToUse = nNumSamples;

if(nNumSamplesToUse * sizeof(short) * g_nSPKR_NumChannels > nBytesFree)
nNumSamplesToUse = nBytesFree / (sizeof(short) * g_nSPKR_NumChannels);
if(FramesToBytes(nNumSamplesToUse) > nBytesFree)
nNumSamplesToUse = BytesToFrames(nBytesFree);

if(bBufferError)
pSpeakerBuffer = &pSpeakerBuffer[(nNumSamples - nNumSamplesToUse) * g_nSPKR_NumChannels];
Expand All @@ -760,7 +732,7 @@ static ULONG Spkr_SubmitWaveBuffer(short* pSpeakerBuffer, ULONG nNumSamples)
//LogOutput("[Submit] C=%08X, PC=%08X, WC=%08X, Diff=%08X, Off=%08X, NS=%08X +++\n", nDbgSpkrCnt, dwCurrentPlayCursor, dwCurrentWriteCursor, dwCurrentWriteCursor-dwCurrentPlayCursor, dwByteOffset, nNumSamplesToUse);

hr = DSGetLock(SpeakerVoice.lpDSBvoice,
dwByteOffset, (uint32_t)nNumSamplesToUse * sizeof(short) * g_nSPKR_NumChannels,
dwByteOffset, FramesToBytes(nNumSamplesToUse),
&pDSLockedBuffer0, &dwDSLockedBufferSize0,
&pDSLockedBuffer1, &dwDSLockedBufferSize1);
if (FAILED(hr))
Expand All @@ -771,13 +743,13 @@ static ULONG Spkr_SubmitWaveBuffer(short* pSpeakerBuffer, ULONG nNumSamples)

memcpy(pDSLockedBuffer0, &pSpeakerBuffer[0], dwDSLockedBufferSize0);
if (g_bSpkrOutputToRiff)
RiffPutSamples(pDSLockedBuffer0, dwDSLockedBufferSize0 / (sizeof(short) * g_nSPKR_NumChannels));
RiffPutSamples(pDSLockedBuffer0, BytesToFrames(dwDSLockedBufferSize0));

if(pDSLockedBuffer1)
{
memcpy(pDSLockedBuffer1, &pSpeakerBuffer[dwDSLockedBufferSize0/sizeof(short)], dwDSLockedBufferSize1);
if (g_bSpkrOutputToRiff)
RiffPutSamples(pDSLockedBuffer1, dwDSLockedBufferSize1 / (sizeof(short) * g_nSPKR_NumChannels));
RiffPutSamples(pDSLockedBuffer1, BytesToFrames(dwDSLockedBufferSize1));
}

// Commit sound buffer
Expand All @@ -789,7 +761,7 @@ static ULONG Spkr_SubmitWaveBuffer(short* pSpeakerBuffer, ULONG nNumSamples)
return nNumSamples;
}

dwByteOffset = (dwByteOffset + (uint32_t)nNumSamplesToUse*sizeof(short)*g_nSPKR_NumChannels) % g_dwDSSpkrBufferSize;
dwByteOffset = (dwByteOffset + FramesToBytes(nNumSamplesToUse)) % g_dwDSSpkrBufferSize;
}

return bBufferError ? nNumSamples : nNumSamplesToUse;
Expand Down
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