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WASAPI: Audio distortion 22kHz #5538

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WASAPI: Audio distortion 22kHz#5538
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icculus
@glebm

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@glebm
glebm
opened on Apr 15, 2022

The WASAPI audio backend introduces distortion when resampling from 22 kHZ.

SDL/src/audio/wasapi/SDL_wasapi.c

Lines 562 to 566 in 01b14e1

if (this->spec.freq != waveformat->nSamplesPerSec) {
streamflags |= (AUDCLNT_STREAMFLAGS_AUTOCONVERTPCM | AUDCLNT_STREAMFLAGS_SRC_DEFAULT_QUALITY);
waveformat->nSamplesPerSec = this->spec.freq;
waveformat->nAvgBytesPerSec = waveformat->nSamplesPerSec * waveformat->nChannels * (waveformat->wBitsPerSample / 8);
}

Spectrogram recorded by @ikonomov:

Spectrogram

Original report and more details: diasurgical/DevilutionX#1390

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