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fixes for ASIO sound interface

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This commit is contained in:
Volker Fischer 2008-11-01 22:26:17 +00:00
parent 78684feaf7
commit 8de53c301a
2 changed files with 19 additions and 7 deletions
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2
linux/sound.cpp
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@ -195,7 +195,7 @@ void CSound::SetInNumBuf ( int iNewNum )
if ( iNewNum != iCurPeriodSizeIn )
{
iCurPeriodSizeIn = iNewNum;
bChangParamIn = true;
bChangParamIn = true;
}
}

24
windows/sound.cpp
View file

@ -481,6 +481,18 @@ std::string CSound::PrepareDriver()
iMinNumSndBuf = static_cast<int> (
ceil ( static_cast<double> ( iASIOBufferSizeMono ) / iBufferSizeMono ) );
// TODO better solution
// For some ASIO buffer sizes, the above calculation seems not to work although
// it should be correct. Maybe there is a misunderstanding or a bug in the
// sound interface implementation. As a workaround, we implement a table here, to
// get working parameters for the most common ASIO buffer settings
// Interesting observation: only 256 samples seems to be wrong, all other tested
// buffer sizes like 192, 512, 384, etc. are correct...
if ( iASIOBufferSizeMono == 256 )
{
iMinNumSndBuf = 4;
}
Q_ASSERT ( iMinNumSndBuf < MAX_SND_BUF_IN );
Q_ASSERT ( iMinNumSndBuf < MAX_SND_BUF_OUT );
@ -498,7 +510,7 @@ std::string CSound::PrepareDriver()
QString().number ( iASIOBufferSizeMono ) +
QString ( " samples which is too large. Please try to modify "
"the ASIO buffer size value in your ASIO driver settings (most ASIO "
"drivers like ASIO4All or kx allow to change the ASIO buffer size). "
"drivers like ASIO4All or kx driver allow to change the ASIO buffer size). "
"Recommended settings are 96 or 128 samples." ), "Ok", 0 );
}
@ -739,7 +751,7 @@ void CSound::bufferSwitch ( long index, ASIOBool processNow )
{
psCaptureBuffer[iBufferPosCapture +
2 * iCurSample + bufferInfos[i].channelNum] =
((short*) bufferInfos[i].buffers[index])[iCurSample];
( (short*) bufferInfos[i].buffers[index] )[iCurSample];
}
break;
@ -751,7 +763,7 @@ void CSound::bufferSwitch ( long index, ASIOBool processNow )
{
// convert current sample in 16 bit format
int iCurSam = 0;
memcpy ( &iCurSam, ((char*) bufferInfos[i].buffers[index]) + iCurSample * 3, 3);
memcpy ( &iCurSam, ( (char*) bufferInfos[i].buffers[index] ) + iCurSample * 3, 3 );
iCurSam >>= 8;
psCaptureBuffer[iBufferPosCapture +
@ -783,7 +795,7 @@ void CSound::bufferSwitch ( long index, ASIOBool processNow )
case ASIOSTInt16LSB:
for ( iCurSample = 0; iCurSample < iASIOBufferSizeMono; iCurSample++ )
{
((short*) bufferInfos[i].buffers[index])[iCurSample] =
( (short*) bufferInfos[i].buffers[index] )[iCurSample] =
psPlayBuffer[2 * iCurSample + bufferInfos[i].channelNum];
}
break;
@ -798,7 +810,7 @@ void CSound::bufferSwitch ( long index, ASIOBool processNow )
int iCurSam = static_cast<int> ( psPlayBuffer[2 * iCurSample + bufferInfos[i].channelNum] );
iCurSam <<= 8;
memcpy ( ((char*) bufferInfos[i].buffers[index]) + iCurSample * 3, &iCurSam, 3);
memcpy ( ( (char*) bufferInfos[i].buffers[index] ) + iCurSample * 3, &iCurSam, 3 );
}
break;
@ -807,7 +819,7 @@ void CSound::bufferSwitch ( long index, ASIOBool processNow )
{
// convert to 32 bit
int iCurSam = static_cast<int> ( psPlayBuffer[2 * iCurSample + bufferInfos[i].channelNum] );
((int*) bufferInfos[i].buffers[index])[iCurSample] = ( iCurSam << 16 );
( (int*) bufferInfos[i].buffers[index] )[iCurSample] = ( iCurSam << 16 );
}
break;
}