This structure describes the capabilities of a waveform-audio output device.
At a Glance
| Header file: | Mmsystem.h |
| Windows CE versions: | 2.0 and later |
Syntax
typedef struct {
WORD wMid;
WORD wPid;
MMVERSION vDriverVersion;
CHAR szPname[MAXPNAMELEN];
DWORD dwFormats;
WORD wChannels;
WORD wReserved1;
DWORD dwSupport;
} WAVEOUTCAPS;
Members
wMid
Manufacturer identifier for the device driver for the device. Manufacturer identifiers are defined in Manufacturer and Product Identifiers.
wPid
Product identifier for the device. Product identifiers are defined in Manufacturer and Product Identifiers.
vDriverVersion
Version number of the device driver for the device. The high-order byte is the major version number, and the low-order byte is the minor version number.
szPname
Null-terminated string that contains the product name.
dwFormats
Specifies the standard formats that are supported. It is one or a combination of the following flags:
| Flag | Description |
| WAVE_FORMAT_1M08 | 11.025 kHz, mono, 8-bit |
| WAVE_FORMAT_1M16 | 11.025 kHz, mono, 16-bit |
| WAVE_FORMAT_1S08 | 11.025 kHz, stereo, 8-bit |
| WAVE_FORMAT_1S16 | 11.025 kHz, stereo, 16-bit |
| WAVE_FORMAT_2M08 | 22.05 kHz, mono, 8-bit |
| WAVE_FORMAT_2M16 | 22.05 kHz, mono, 16-bit |
| WAVE_FORMAT_2S08 | 22.05 kHz, stereo, 8-bit |
| WAVE_FORMAT_2S16 | 22.05 kHz, stereo, 16-bit |
| WAVE_FORMAT_4M08 | 44.1 kHz, mono, 8-bit |
| WAVE_FORMAT_4M16 | 44.1 kHz, mono, 16-bit |
| WAVE_FORMAT_4S08 | 44.1 kHz, stereo, 8-bit |
| WAVE_FORMAT_4S16 | 44.1 kHz, stereo, 16-bit |
wChannels
Number specifying whether the device supports mono (1) or stereo (2) output.
wReserved1
Packing.
dwSupport
Specifies the optional functionality supported by the device. It is one of the following flags:
| Value | Description |
| WAVECAPS_LRVOLUME | Supports separate left and right volume control. |
| WAVECAPS_PITCH | Supports pitch control. |
| WAVECAPS_PLAYBACKRATE | Supports playback rate control. |
| WAVECAPS_SYNC | The driver is synchronous and blocks while playing a buffer. |
| WAVECAPS_VOLUME | Supports volume control. |
| WAVECAPS_SAMPLEACCURATE | Returns sample-accurate position information. |
Remarks
If a device supports volume changes, the WAVECAPS_VOLUME flag is set for the dwSupport member. If a device supports separate volume changes on the left and right channels, both the WAVECAPS_VOLUME and the WAVECAPS_LRVOLUME flags are set for this member.