WAVE_HEADER Field - ulAvgBytesPerSec

ulAvgBytesPerSec (ULONG)

Rate at which the waveform data should be transferred. Playback software can estimate the buffer size by using this value. The following formula can be used to calculate this value for the audio presentation format of standard PCM data:

   usChannels x usBitsPerSec x usBitsPerSample /8

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