This function sets the pitch of a waveform output device.
At a Glance
| Header file: | Mmsystem.h |
| Windows CE versions: | 2.0 and later |
Syntax
MMRESULT waveOutSetPitch(HWAVEOUT hwo, DWORD dwPitch);
Parameters
hwo
Handle to the waveform-audio output device.
dwPitch
Specifies a 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
One of the values described in the following table is returned.
| Value | Description |
| MMSYSERR_NOERROR | Success. |
| 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 is not 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).