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ASIO: Handle buffer size changes #473

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ASIO: Handle buffer size changes #473

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f7beca8
ASIO: Handle buffer size changes
npostavs Jan 20, 2021
f8da4ee
Don't try to keep the buffer size info updated
npostavs Feb 26, 2021
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15 changes: 15 additions & 0 deletions include/pa_asio.h
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,21 @@ PaError PaAsio_GetAvailableBufferSizes( PaDeviceIndex device,
long *minBufferSizeFrames, long *maxBufferSizeFrames, long *preferredBufferSizeFrames, long *granularity );


typedef void (*PaAsioResetRequestCallback)();

/** Register callback to detect reset requests.

This correponds to the ASIO kAsioResetRequest and kAsioBufferSizeChange
messages.

@param callback The function to call on ASIO reset request. This is called
when the driver's buffer size has changed or it needs a reset, usually in
response to a user changing the configuration. Call Pa_Terminate followed by
Pa_Initialize to have the changes reflected in Portaudio's API. Pass NULL to
unregister a callback.
*/
void PaAsio_RegisterResetRequestCallback( PaAsioResetRequestCallback callback );

/** Backwards compatibility alias for PaAsio_GetAvailableBufferSizes

@see PaAsio_GetAvailableBufferSizes
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14 changes: 14 additions & 0 deletions src/hostapi/asio/pa_asio.cpp
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Expand Up @@ -3199,6 +3199,13 @@ static void sampleRateChanged(ASIOSampleRate sRate)
PA_DEBUG( ("sampleRateChanged : %d \n", sRate));
}

static PaAsioResetRequestCallback resetRequestCallback_;

void PaAsio_RegisterResetRequestCallback( PaAsioResetRequestCallback callback )
{
resetRequestCallback_ = callback;
}

static long asioMessages(long selector, long value, void* message, double* opt)
{
// TAKEN FROM THE ASIO SDK
Expand Down Expand Up @@ -3226,6 +3233,10 @@ static long asioMessages(long selector, long value, void* message, double* opt)

case kAsioBufferSizeChange:
//printf("kAsioBufferSizeChange \n");
if (resetRequestCallback_) {
resetRequestCallback_();
ret = 1L;
}
break;

case kAsioResetRequest:
Expand All @@ -3240,6 +3251,9 @@ static long asioMessages(long selector, long value, void* message, double* opt)
http://www.portaudio.com/trac/ticket/108
*/
//asioDriverInfo.stopped; // In this sample the processing will just stop
if (resetRequestCallback_) {
resetRequestCallback_();
}
ret = 1L;
break;

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