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waveOutSetPitch

  • Статья

The waveOutSetPitch function sets the pitch for the specified waveform-audio output device.

MMRESULT waveOutSetPitch(
  HWAVEOUT hwo,  
  DWORD dwPitch  
);

Parameters

hwo

Handle to the waveform-audio output device.

dwPitch

New pitch multiplier setting. This setting indicates the current change in pitch from the original authored setting. The pitch multiplier must be a positive value.

The pitch multiplier is specified as a fixed-point value. The high-order word contains the signed integer part of the number, and the low-order word contains the fractional part. A value of 0x8000 in the low-order word represents one-half, and 0x4000 represents one-quarter. For example, the value 0x00010000 specifies a multiplier of 1.0 (no pitch change), and a value of 0x000F8000 specifies a multiplier of 15.5.

Return Values

Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error values include the following.

Value Description
MMSYSERR_INVALHANDLE Specified device handle is invalid.
MMSYSERR_NODRIVER No device driver is present.
MMSYSERR_NOMEM Unable to allocate or lock memory.
MMSYSERR_NOTSUPPORTED Function isn't supported.

Remarks

Changing the pitch does not change the playback rate or the sample rate, nor does it change the playback time. Not all devices support pitch changes. To determine whether the device supports pitch control, use the WAVECAPS_PITCH flag to test the dwSupport member of the WAVEOUTCAPS structure (filled by the waveOutGetDevCaps function).

Requirements

**  Windows NT/2000/XP:** Included in Windows NT 3.1 and later.
**  Windows 95/98/Me:** Included in Windows 95 and later.
**  Header:** Declared in Mmsystem.h; include Windows.h.
**  Library:** Use Winmm.lib.

See Also

Waveform Audio, Waveform Functions, WAVEOUTCAPS, waveOutGetDevCaps