MPEGLAYER3WAVEFORMAT structure
The MPEGLAYER3WAVEFORMAT structure describes an MPEG Audio Layer-3 (MP3) audio format.
Syntax
typedef struct mpeglayer3waveformat_tag { WAVEFORMATEX wfx; WORD wID; DWORD fdwFlags; WORD nBlockSize; WORD nFramesPerBlock; WORD nCodecDelay; } MPEGLAYER3WAVEFORMAT;
Members
- wfx
-
WAVEFORMATEX structure that specifies the basic audio format. The wFormatTag member must be WAVE_FORMAT_MPEGLAYER3. The cbSize member must be at least 12. (For cbSize, you can use the constant MPEGLAYER3_WFX_EXTRA_BYTES, defined in the Mmreg.h.)
- wID
-
Set this structure member to MPEGLAYER3_ID_MPEG.
- fdwFlags
-
Indicates whether padding is used to adjust the average bitrate to the sampling rate. Use one of the following values:
- nBlockSize
-
Block size in bytes. This value equals the frame length in bytes x nFramesPerBlock. For MP3 audio, the frame length is calculated as follows: 144 x (bitrate / sample rate) + padding.
- nFramesPerBlock
-
Number of audio frames per block.
- nCodecDelay
-
Encoder delay in samples. If you do not know this value, set this structure member to zero.
Requirements
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See also
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Build date: 11/21/2012
