audio (acdt01) dump broken? (BETA4 (5))

Oliver Fromme olli at
Mon Sep 19 05:29:31 PDT 2005

Emanuel Strobl <Emanuel.strobl at> wrote:
 > Ben Kaduk wrote:
 > > I also checked the handbook for copying cd's -- you are correct that
 > > 2352 is the "magic" blocksize -- I used 64k when ripping an entire
 > > (data) cd to copy it.

It's not "magic", it's simply the "Red Book" sector size of
a CD.  (The sample rate is 44.1 khz, so you have 176400
bytes per second [44100 * 4].  A single-speed drive reads
75 sectors per second, so you need 176400 / 75 = 2352 bytes
per sector.  That's where the number comes from.)

 > Hmm, AFAIK WAV _is_ PCM, both don't have any headers. But I'm out of=20
 > business for details for more than 10 years, so I may be wrong.

No, WAV is a format invented by Microsoft which contains a
header (usually 44 bytes, but it can vary).  "Raw PCM"
doesn't have a header (when handling CD audio data, it's
usually 2-channel signed 16 bits little-endian linear data).

You can use sox for conversion.

Best regards

Oliver Fromme,  secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing
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        -- Dennis M. Ritchie.

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