wasapi:

- new method PaWasapi_GetFramesPerHostBuffer which allows to get number of input/output frames per host (WASAPI) buffer, this method helps to find out maximal values for PaWasapiHostProcessorCallback
 - documentation fixes

src/hostapi/wasapi/pa_win_wasapi.c

@@ -1391,6 +1391,22 @@ int PaWasapi_GetDeviceRole( PaDeviceIndex nDevice )
 	return paWasapi->devInfo[ index ].formFactor;
 }
 
+// ------------------------------------------------------------------------------------------
+PaError PaWasapi_GetFramesPerHostBuffer( PaStream *pStream, unsigned int *nInput, unsigned int *nOutput )
+{
+    PaWasapiStream *stream = (PaWasapiStream *)pStream;
+	if (stream == NULL)
+		return paBadStreamPtr;
+
+	if (nInput != NULL)
+		(*nInput) = stream->in.framesPerHostCallback;
+
+	if (nOutput != NULL)
+		(*nOutput) = stream->out.framesPerHostCallback;
+
+	return paNoError;
+}
+
 // ------------------------------------------------------------------------------------------
 static void LogWAVEFORMATEXTENSIBLE(const WAVEFORMATEXTENSIBLE *in)
 {