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some more ASIO stuff

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This commit is contained in:
Volker Fischer 2008-04-13 16:43:21 +00:00
parent ceacfd9a13
commit 2d368f6ace
2 changed files with 67 additions and 12 deletions
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70
windows/sound.cpp
View File

@ -327,12 +327,62 @@ void CSound::InitRecordingAndPlayback ( int iNewBufferSize )
// first, stop audio
ASIOStop();
// set internal parameters
iBufferSize = iNewBufferSize;
// calculate "nearest" buffer size and set internal parameter accordingly
// first check minimum and maximum values
if ( iNewBufferSize < HWBufferInfo.lMinSize )
{
iBufferSize = HWBufferInfo.lMinSize;
}
else
{
if ( iNewBufferSize > HWBufferInfo.lMaxSize )
{
iBufferSize = HWBufferInfo.lMaxSize;
}
else
{
// initialization
int iTrialBufSize = HWBufferInfo.lMinSize;
int iLastTrialBufSize = HWBufferInfo.lMinSize;
bool bSizeFound = false;
// test loop
while ( ( iTrialBufSize <= HWBufferInfo.lMaxSize ) && ( !bSizeFound ) )
{
if ( iTrialBufSize > iNewBufferSize )
{
// test which buffer size fits better: the old one or the
// current one
if ( ( iTrialBufSize - iNewBufferSize ) < ( iNewBufferSize - iLastTrialBufSize ) )
{
iBufferSize = iTrialBufSize;
}
else
{
iBufferSize = iLastTrialBufSize;
}
// exit while loop
bSizeFound = true;
}
// store old trial buffer size
iLastTrialBufSize = iTrialBufSize;
// increment trial buffer size (check for special case first)
if ( HWBufferInfo.lGranularity == -1 )
{
// special case: buffer sizes are a power of 2
iTrialBufSize *= 2;
}
else
{
iTrialBufSize += HWBufferInfo.lGranularity;
}
}
}
}
// TODO this should be done in the setinoutbuf functions
// create and activate buffers
ASIOCreateBuffers(bufferInfos, 2 * NUM_IN_OUT_CHANNELS,
iBufferSize * BYTES_PER_SAMPLE, &asioCallbacks);
@ -527,15 +577,11 @@ pstrDevices[0] = driverInfo.name;
throw CGenErr ( "The audio device does not support required number of channels." );
}
// check the usable buffer sizes
long lMinSize;
long lMaxSize;
long lPreferredSize;
long lGranularity;
ASIOGetBufferSize ( &lMinSize, &lMaxSize, &lPreferredSize, &lGranularity );
// TODO make use of the information...
// query the usable buffer sizes
ASIOGetBufferSize ( &HWBufferInfo.lMinSize,
&HWBufferInfo.lMaxSize,
&HWBufferInfo.lPreferredSize,
&HWBufferInfo.lGranularity );
// set the sample rate and check if sample rate is supported
ASIOSetSampleRate ( SND_CRD_SAMPLE_RATE );

9
windows/sound.h
View File

@ -104,6 +104,15 @@ protected:
bool bASIOPostOutput;
ASIOCallbacks asioCallbacks;
// audio hardware buffer info
struct sHWBufferInfo
{
long lMinSize;
long lMaxSize;
long lPreferredSize;
long lGranularity;
} HWBufferInfo;
// callbacks
static void bufferSwitch ( long index, ASIOBool processNow );
static ASIOTime* bufferSwitchTimeInfo ( ASIOTime *timeInfo, long index, ASIOBool processNow );