.wav file header info

[Rajesh Kapur]

Hi,

Does anyone know how to extract the header information like duration, bit
rate, audio channel configuration etc from a wave file? An example (if
possible) would really help ...

Thanks.
- Rajesh

[Andy Hassall]

Re: .wav file header info

On Wed, 14 Jan 2004 13:59:20 -0600, "Rajesh Kapur" <rkapur@mpr.org > wrote:
[color=blue]
>Does anyone know how to extract the header information like duration, bit
>rate, audio channel configuration etc from a wave file? An example (if
>possible) would really help ...[/color]

http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=wav+header+format

Or search for WAV on http://www.wotsit.org/

Use unpack <http://php.net/unpack> to decode the header. The format looks
quite simple, so here's an example.

<pre>
<?php
$fp = fopen('chord.wa v', 'r');
fseek($fp, 20);
$rawheader = fread($fp, 16);
$header = unpack('vtype/vchannels/Vsamplerate/Vbytespersec/valignment/vbits',
$rawheader);
print_r($header );
?>
</pre>

Outputs:

Array
(
[type] => 1
[channels] => 2
[samplerate] => 22050
[bytespersec] => 88200
[alignment] => 4
[bits] => 16
)

--
Andy Hassall <andy@andyh.co. uk> / Space: disk usage analysis tool
<http://www.andyh.co.uk > / <http://www.andyhsoftwa re.co.uk/space>