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wasapi: relax check for a latency range when deciding to switch from Event to Poll mode to have 1-21 ms range fine tuneable, add check for a min period when correcting period for UAC1 devices to avoid failure to initialize audio client due to invalid period error

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dmitrykos 2018-12-12 23:29:44 +02:00
commit 7572245aec
1 changed files with 6 additions and 4 deletions
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10
src/hostapi/wasapi/pa_win_wasapi.c
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@ -2937,10 +2937,10 @@ static HRESULT CreateAudioClient(PaWasapiStream *pStream, PaWasapiSubStream *pSu
// Work 1:1 with user buffer (only polling allows to use >1)
framesPerLatency += MakeFramesFromHns(SecondsTonano100(params->suggestedLatency), pSub->wavex.Format.nSamplesPerSec);
// Use Polling if overall latency is > 5ms as it allows to use 100% CPU in a callback,
// Use Polling if overall latency is >= 21.33ms as it allows to use 100% CPU in a callback,
// or user specified latency parameter
overall = MakeHnsPeriod(framesPerLatency, pSub->wavex.Format.nSamplesPerSec);
if ((overall >= (106667*2)/*21.33ms*/) || ((INT32)(params->suggestedLatency*100000.0) != 0/*0.01 msec granularity*/))
if (overall >= (106667 * 2)/*21.33ms*/)
{
framesPerLatency = _GetFramesPerHostBuffer(userFramesPerBuffer,
params->suggestedLatency, pSub->wavex.Format.nSamplesPerSec, 0/*,
@ -2967,9 +2967,7 @@ static HRESULT CreateAudioClient(PaWasapiStream *pStream, PaWasapiSubStream *pSu
{
// Do it only for Polling mode
if ((pSub->streamFlags & AUDCLNT_STREAMFLAGS_EVENTCALLBACK) == 0)
{
framesPerLatency /= WASAPI_PACKETS_PER_INPUT_BUFFER;
}
}
// Calculate aligned period
@ -3106,6 +3104,10 @@ static HRESULT CreateAudioClient(PaWasapiStream *pStream, PaWasapiSubStream *pSu
// Get new aligned frames lowered by calculated ratio
framesPerLatency = MakeFramesFromHns(pSub->period / ratio, pSub->wavex.Format.nSamplesPerSec);
_CalculateAlignedPeriod(pSub, &framesPerLatency, ALIGN_BWD);
// Make sure we are not below the minimum period
if (pSub->period < pInfo->MinimumDevicePeriod)
pSub->period = pInfo->MinimumDevicePeriod;
// Release previous client
SAFE_RELEASE(audioClient);