88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
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//
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// Copyright (c) 1999 Microsoft Corporation
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//
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// HIDCOM.EXE -- exploratory USB Phone Console Application
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//
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// audio.h -- audio magic
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//
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#ifndef _HIDCOM_AUDIO_H_
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#define _HIDCOM_AUDIO_H_
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#include <basetyps.h>
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#include <setupapi.h>
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//////////////////////////////////////////////////////////////////////////////
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//
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// DiscoverAssociatedWaveId
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//
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// This function searches for a wave device to match the HID device in the
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// PNP tree location specified in the passed in SP_DEVICE_INTERFACE_DATA
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// structure, obtained from the SetupKi API. It returns the wave id for
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// the matched device.
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//
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// It uses the helper function FindWaveIdFromHardwareIdString() to search for
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// the wave device based on a devinst DWORD and a hardware ID string. First,
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// it must obtain the devinst for the device; it does this by calling a SetupDi
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// function and looking up the devinst in a resulting structure. The hardware
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// ID string is then retrieved from the registry and trimmed, using the helper
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// function HardwareIdFromDevinst().
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//
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// See FindWaveIdFromHardwareIdString() for further comments on the search
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// algorithm.
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//
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// Arguments:
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// dwDevInst - IN - Device Instance of the HID device
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// fRender - IN - TRUE for wave out, FALSE for wave in
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// pdwWaveId - OUT - the wave id associated with this HID device
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//
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// Return values:
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// S_OK - succeeded and matched wave id
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// other from helper functions FindWaveIdFromHardwareIdString() or
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// or HardwareIdFromDevinst()
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//
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HRESULT DiscoverAssociatedWaveId(
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IN DWORD dwDevInst,
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IN BOOL fRender,
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OUT DWORD * pdwWaveId
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);
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//////////////////////////////////////////////////////////////////////////////
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//
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// ExamineWaveDevices
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//
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// This function is for debugging purposes only. It enumerates audio devices
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// using the Wave API and prints the device path string as well as the
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// device instance DWORD for each render or capture device.
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//
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// Arguments:
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// fRender - IN - true means examine wave out devices; false = wave in
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//
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// Return values:
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// E_OUTOFMEMORY
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// S_OK
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//
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HRESULT ExamineWaveDevices(
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IN BOOL fRender
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);
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#ifdef __cplusplus
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};
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#endif
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#endif // _HIDCOM_AUDIO_H_
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//
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// eof
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//
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