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wasapi: clamp number of output channels to 8 

This is the most supported in standard layout, if we request more it
tends to fallback to stereo instead. Also channels mask is 32-bit and it
can get truncated.
This commit is contained in:
Kacper Michajłow 2023-02-02 20:02:57 +01:00 committed by Dudemanguy
parent 0728e4778f
commit 4f0b654503
1 changed files with 13 additions and 1 deletions
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14
audio/out/ao_wasapi_utils.c
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@ -143,7 +143,19 @@ static void set_waveformat(WAVEFORMATEXTENSIBLE *wformat,
wformat->SubFormat = *format_to_subtype(format->mp_format);
wformat->Samples.wValidBitsPerSample = format->used_msb;
wformat->dwChannelMask = mp_chmap_to_waveext(channels);
uint64_t chans = mp_chmap_to_waveext(channels);
wformat->dwChannelMask = chans;
if (wformat->Format.nChannels > 8 || wformat->dwChannelMask != chans) {
// IAudioClient::IsFormatSupported tend to fallback to stereo for closest
// format match when there are more channels. Remix to standard layout.
// Also if input channel mask has channels outside 32-bits override it
// and hope for the best...
wformat->dwChannelMask = KSAUDIO_SPEAKER_7POINT1_SURROUND;
wformat->Format.nChannels = 8;
}
update_waveformat_datarate(wformat);
}