ACMMMIODLL acmmmioGetFormats(int *formats_n, int tag, int *channels, long *freq, int *bits) {
	int ret;

    if (formats_n==NULL) return - 1 ;
    if (in_supportedTags(tag)) return - 2 ;
    if (channels==NULL) return - 3 ;
    if (freq==NULL) return - 4 ;
    if (bits==NULL) return - 5 ;
    if ((*formats_n)<= 0 ) return - 7 ;

	GetFormatsStruct getFormatsStruct;
	WaveFormat       Format;
	ACMFORMATDETAILS Details;
	memset(&Format,  0 , sizeof(Format));
	memset(&Details,  0 , sizeof(Details));

	Details.cbStruct=sizeof(ACMFORMATDETAILS);
	Details.pwfx=&Format;
	Details.cbwfx=sizeof(Format);
	Details.dwFormatTag=tag;
	Format.wFormatTag=tag; 

	getFormatsStruct.formats_max=(*formats_n);
	getFormatsStruct.formats_n= 0 ;
	getFormatsStruct.channels=channels;
	getFormatsStruct.freq=freq;
	getFormatsStruct.bits=bits;
	ret=acmFormatEnum(NULL, &Details, getFormatsCB, (unsigned long)(&getFormatsStruct), ACM_FORMATENUMF_WFORMATTAG);
	if (ret) {
		switch (ret) {
		case ACMERR_NOTPOSSIBLE: return - 8 ;// The details for the format cannot be returned. 
		case MMSYSERR_INVALFLAG: return - 9 ;// At least one flag is invalid. 
		case MMSYSERR_INVALHANDLE: return - 10 ;// The specified handle is invalid. 
		case MMSYSERR_INVALPARAM: return - 11 ;//At least one parameter is invalid. 
		default: return - 12 ;
		}
	}
	(*formats_n)=getFormatsStruct.formats_n;

	return  0 ;
}

-	Details	{...}
	cbStruct	152
	dwFormatIndex	0
	dwFormatTag	1
	fdwSupport	0
-	pwfx	0x0012fc10
	wFormatTag	1
	nChannels	0
	nSamplesPerSec	0
	nAvgBytesPerSec	0
	nBlockAlign	0
	wBitsPerSample	0
	cbSize	0
	cbwfx	146
+	szFormat	0x0012fb90 ""