Subject: Re: [linux-audio-dev] design question for HDR
From: Paul Barton-Davis (pbd_AT_Op.Net)
Date: Mon Apr 03 2000 - 20:35:34 EEST
>>> You don't have to rewrite the entire file after cutting one track if you
>>> map the segments to the sector sizes.
>>
>> That would imply that you could only cut in segment-sized pieces
>> and/or used a playlist, wouldn't it ?
>No, you could slip a track by any amount and then rewrite the sectors for
>that track. Since the other tracks are in sector size chunks, those sectors
>don't need to be rewritten.
I don't think that you could do this without using raw I/O. The linux
fs abstraction doesn't give you any access to the notion of something
as low level as a disk sector, and trying to use its model of "blocks"
would be potentially problematic, I think. Not sure about this,
though.
Raw I/O has a number of benefits, but the invisibility of the data to
regular apps is a downside. OTOH, since the data format would already
be "unique", its not much of a downside.
But isn't there another problem ? The sectors on (modern?) disks are
not all the same size ...
--p
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