c++ - WASAPI: Choosing a wave format for exclusive output -


i'm trying open exclusive stream output device using wasapi. i'm having trouble choosing acceptable format, since there appear no hints formats accepted given device.

in case, iaudioclient::getmixformat(), otherwise return sort of default format device, returns format can't used in exclusive mode (iaudioclient::isformatsupported() returns audclnt_e_unsupported_format). don't know go there. there's ridiculous number of combinations of wave format parameters - literally have iterate through every 1 of them until works?

well, asked msdn forums , came answer.

you need check device's default device format via immdevice::openpropertystore(), , subsequently ipropertystore::getvalue(), not iaudioclient::getmixformat(). here code retrieved acceptable waveformatex structure:

//coinitialize/enumerate devices  ipropertystore* store = nullptr;  hr = device->openpropertystore(stgm_read, &store);  if (failed(hr)) {     exitprocess(1); }  propvariant prop;  hr = store->getvalue(pkey_audioengine_deviceformat, &prop);  if (failed(hr)) {     exitprocess(2); }  hr = device->activate (     __uuidof(iaudioclient),      clsctx_all,     null,     (void**)&audioclient );  device->release(); device = nullptr;  if (failed(hr)) {     exitprocess(3); }  hr = audioclient->isformatsupported (     audclnt_sharemode_exclusive,     (pwaveformatex)prop.blob.pblobdata,     null );  if (failed(hr)) {     exitprocess(4); }

the final value of hr s_ok.


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