Wave audio data blocks

[Vinay Kapoor]

Hi All,

Is there a way of calculating an optimum size of the audio data blocks
allocated for playing waveform audio, based on the waveforms characteristics
(format, bits/sample, sample rate). In the following call:

waveOutWrite( m_hWaveOut, m_pWaveHdr[m_nBufIndex], sizeof(WAVEHDR) )...

this would be the "m_pWaveHdr" parameter.

Regards,
Vinay

[Vibin]

Vinay,

The audio data can be created in blocks. For example to hold an
audio data for one sec you can use the following formula

RECORD_SIZE SAMPLING_FREQ * TIME_TO_RECORD *
BYTES_PER_SAMPLE*NUMBER_OF_CHANNELS

Here the best practice is to set up the buffer for 1sec of audio
data ie by setting TIME_TO_RECORD = 1 and implement a circular
buffer technique with wave call back to play the audio data.So
each buffer will be capable of holding 1sec of data.

I hope this helps
Vibin

"Vinay Kapoor" <vinay_kapoor@yahoo.com> wrote:
>Hi All,
>
>Is there a way of calculating an optimum size of the audio data blocks
>allocated for playing waveform audio, based on the waveforms characteristics
>(format, bits/sample, sample rate). In the following call:
>
>waveOutWrite( m_hWaveOut, m_pWaveHdr[m_nBufIndex], sizeof(WAVEHDR) )...
>
>this would be the "m_pWaveHdr" parameter.
>
>Regards,
>Vinay
>
>