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WASAPI: Prime the playback buffer before starting.

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This commit is contained in:
David Reid
2026-01-11 17:03:55 +10:00
parent 3debb4a20f
commit 39abeb167e
1 changed files with 22 additions and 0 deletions
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miniaudio.h
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@@ -24541,6 +24541,28 @@ static ma_result ma_device_start__wasapi(ma_device* pDevice)
ma_context_state_wasapi* pContextStateWASAPI = ma_context_get_backend_state__wasapi(ma_device_get_context(pDevice));
HRESULT hr;
/*
We need to prime the data so we don't get an immediate underrun, and also to ensure we have a
buffer of silence for duplex mode.
*/
if (pDevice->type == ma_device_type_playback || pDevice->type == ma_device_type_duplex) {
ma_uint32 bufferSizeInFrames = pDeviceStateWASAPI->actualBufferSizeInFramesPlayback;
ma_uint32 padding;
BYTE* pBufferData;
hr = ma_IAudioClient_GetCurrentPadding(pDeviceStateWASAPI->pAudioClientPlayback, &padding);
if (FAILED(hr)) {
padding = 0;
}
bufferSizeInFrames -= padding;
hr = ma_IAudioRenderClient_GetBuffer(pDeviceStateWASAPI->pRenderClient, bufferSizeInFrames, &pBufferData);
if (SUCCEEDED(hr)) {
ma_IAudioRenderClient_ReleaseBuffer(pDeviceStateWASAPI->pRenderClient, bufferSizeInFrames, MA_AUDCLNT_BUFFERFLAGS_SILENT);
}
}
if (pDevice->type == ma_device_type_capture || pDevice->type == ma_device_type_duplex || pDevice->type == ma_device_type_loopback) {
hr = ma_IAudioClient_Start(pDeviceStateWASAPI->pAudioClientCapture);
if (FAILED(hr)) {