WAVEFORMAT structure (mmeapi.h)
The WAVEFORMAT structure describes the format of waveform-audio data. Only format information common to all waveform-audio data formats is included in this structure. This structure has been superseded by the WAVEFORMATEX structure.
Syntax
typedef struct waveformat_tag {
WORD wFormatTag;
WORD nChannels;
DWORD nSamplesPerSec;
DWORD nAvgBytesPerSec;
WORD nBlockAlign;
} WAVEFORMAT, *PWAVEFORMAT, *NPWAVEFORMAT, *LPWAVEFORMAT;
Members
wFormatTag
Format type. The following type is defined:
| Name | Description |
|---|---|
|
Waveform-audio data is PCM. |
nChannels
Number of channels in the waveform-audio data. Mono data uses one channel and stereo data uses two channels.
nSamplesPerSec
Sample rate, in samples per second.
nAvgBytesPerSec
Required average data transfer rate, in bytes per second. For example, 16-bit stereo at 44.1 kHz has an average data rate of 176,400 bytes per second (2 channels — 2 bytes per sample per channel — 44,100 samples per second).
nBlockAlign
Block alignment, in bytes. The block alignment is the minimum atomic unit of data. For PCM data, the block alignment is the number of bytes used by a single sample, including data for both channels if the data is stereo. For example, the block alignment for 16-bit stereo PCM is 4 bytes (2 channels — 2 bytes per sample).
Remarks
For formats that require additional information, this structure is included as a member in another structure along with the additional information.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Header | mmeapi.h (include Mmreg.h) |