WODM_GETPLAYBACKRATE
Sent to a waveform output device driver to request the current playback rate setting for a device.
- The return value is an error code, or zero (MMSYSERR_NOERROR) if the operation is successful. Possible error codes are:
| MMSYSERR_NOTENABLED |
The driver failed to load or initialize. |
| MMSYSERR_NOTSUPPORTED |
The driver does not support changes to the pitch rate. |
- DWORD dwParam1
- Specifies a far pointer to a DWORD location. The driver fills this location with the current playback rate setting. The rate is specified as a fixed-point value. The high-order word of the DWORD contains the signed integer part of the number, and the low-order word contains the fractional part. The fraction is expressed as a WORD in which a value of 0x8000 represents one half, and 0x4000 represents one quarter. For example, the value 0x00010000 specifies a multiplier of 1.0 (no playback rate change), and a value of 0x000F8000 specifies a multiplier of 15.5.
- DWORD dwParam2
- Unused.
Driver support for playback rate changes is optional. However, if a driver supports changes to the playback rate with the WODM_SETPLAYBACKRATE message,
it must support queries with the WODM_GETPLAYBACKRATE message.
See Also
WODM_SETPLAYBACKRATE