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WAVEHDR
The WAVEHDR structure defines the header used to identify a waveform-audio buffer.
typedef struct {
LPSTR lpData;
DWORD dwBufferLength;
DWORD dwBytesRecorded;
DWORD dwUser;
DWORD dwFlags;
DWORD dwLoops;
struct wavehdr_tag * lpNext;
DWORD reserved;
} WAVEHDR;
Members
lpData
Address of the waveform buffer.
dwBufferLength
Length, in bytes, of the buffer.
dwBytesRecorded
When the header is used in input, this member specifies how much data is in
the buffer.
dwUser
User data.
dwFlags
Flags supplying information about the buffer. The following values are defined:
WHDR_BEGINLOOP
This buffer is the first buffer in a loop. This flag is used only with output
buffers.
WHDR_DONE
Set by the device driver to indicate that it is finished with the buffer and
is returning it to the application.
WHDR_ENDLOOP
This buffer is the last buffer in a loop. This flag is used only with output
buffers.
WHDR_INQUEUE
Set by Windows to indicate that the buffer is queued for playback.
WHDR_PREPARED
Set by Windows to indicate that the buffer has been prepared with the waveInPrepareHeader or waveOutPrepareHeader function.
dwLoops
Number of times to play the loop. This member is used only with output buffers.
wavehdr_tag
Reserved.
reserved
Reserved.
Remarks
Use the WHDR_BEGINLOOP and WHDR_ENDLOOP flags in the dwFlags member to specify the beginning and ending data blocks for looping. To loop
on a single block, specify both flags for the same block. Use the dwLoops member in the WAVEHDR structure for the first block in the loop to specify the number of times to
play the loop.
The lpData, dwBufferLength, and dwFlags members must be set before calling the waveInPrepareHeader or waveOutPrepareHeader function. (For either function, the dwFlags member must be set to zero.)
See Also
waveInPrepareHeader, waveOutPrepareHeader
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