MIXER_STATUS MMixerInitialize	(	IN PMIXER_CONTEXT	MixerContext,
		IN PMIXER_ENUM	EnumFunction,
		IN PVOID	EnumContext
	)
Definition at line 736 of file mixer.c.
Referenced by WdmAudInitUserModeMixer(), and WdmAudMixerInitialize().
{
    MIXER_STATUS Status;
    HANDLE hMixer, hKey;
    ULONG DeviceIndex, Count;
    LPWSTR DeviceName;
    LPMIXER_DATA MixerData;
    PMIXER_LIST MixerList;
    PLIST_ENTRY Entry;

    if (!MixerContext || !EnumFunction || !EnumContext)
    {
        /* invalid parameter */
        return MM_STATUS_INVALID_PARAMETER;
    }

    if (!MixerContext->Alloc || !MixerContext->Control || !MixerContext->Free || !MixerContext->Open ||
        !MixerContext->AllocEventData || !MixerContext->FreeEventData ||
        !MixerContext->Close || !MixerContext->OpenKey || !MixerContext->QueryKeyValue || !MixerContext->CloseKey)
    {
        /* invalid parameter */
        return MM_STATUS_INVALID_PARAMETER;
    }

    /* allocate a mixer list */
    MixerList = (PMIXER_LIST)MixerContext->Alloc(sizeof(MIXER_LIST));
    if (!MixerList)
    {
        /* no memory */
        return MM_STATUS_NO_MEMORY;
    }

     /* initialize mixer list */
     MixerList->MixerListCount = 0;
     MixerList->MixerDataCount = 0;
     MixerList->WaveInListCount = 0;
     MixerList->WaveOutListCount = 0;
     MixerList->MidiInListCount = 0;
     MixerList->MidiOutListCount = 0;
     InitializeListHead(&MixerList->MixerList);
     InitializeListHead(&MixerList->MixerData);
     InitializeListHead(&MixerList->WaveInList);
     InitializeListHead(&MixerList->WaveOutList);
     InitializeListHead(&MixerList->MidiInList);
     InitializeListHead(&MixerList->MidiOutList);

     /* store mixer list */
     MixerContext->MixerContext = (PVOID)MixerList;

    /* start enumerating all available devices */
    Count = 0;
    DeviceIndex = 0;

    do
    {
        /* enumerate a device */
        Status = EnumFunction(EnumContext, DeviceIndex, &DeviceName, &hMixer, &hKey);

        if (Status != MM_STATUS_SUCCESS)
        {
            /* check error code */
            if (Status == MM_STATUS_NO_MORE_DEVICES)
            {
                /* enumeration has finished */
                break;
            }
            else
            {
                DPRINT1("Failed to enumerate device %lu\n", DeviceIndex);

                /* TODO cleanup */
                return Status;
            }
        }
        else
        {
            /* create a mixer data entry */
            Status = MMixerCreateMixerData(MixerContext, MixerList, DeviceIndex, DeviceName, hMixer, hKey);
            if (Status != MM_STATUS_SUCCESS)
                break;
        }

        /* increment device index */
        DeviceIndex++;
    }while(TRUE);

    /* now all filters have been pre-opened
     * lets enumerate the filters
     */
    Entry = MixerList->MixerData.Flink;
    while(Entry != &MixerList->MixerData)
    {
        MixerData = (LPMIXER_DATA)CONTAINING_RECORD(Entry, MIXER_DATA, Entry);
        MMixerSetupFilter(MixerContext, MixerList, MixerData, &Count);
        Entry = Entry->Flink;
    }

    Entry = MixerList->MixerData.Flink;
    while(Entry != &MixerList->MixerData)
    {
        MixerData = (LPMIXER_DATA)CONTAINING_RECORD(Entry, MIXER_DATA, Entry);

        /* now handle alternative mixer types */
        MMixerHandleAlternativeMixers(MixerContext, MixerList, MixerData, MixerData->Topology);
        Entry = Entry->Flink;
    }

    //MMixerPrintMixers(MixerContext, MixerList);

    /* done */
    return MM_STATUS_SUCCESS;
}
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