[Flac-dev] new SEEKTABLE block

[Josh Coalson]

Well, I thought there might be cases where you wouldn't know what
you wanted for seek points before encoding, so I included a special
kind of seek point that is a just a place holder.  Between that and
PADDING blocks I think you can pretty much do anything.

You're right in that no metadata affects the checksums so you can
do whatever you want with metadata afterwards.

Josh

--- Mike Wren <mikew at etree.org> wrote:
> I first thought that it would be much better to create a single seek
> standard for FLAC.  Then, I thought, why couldn't someone just create
> the
> optional SEEKTABLE data after an initial encode, if they need this
> data?
> Since the checksums are a part of the FLAC format (unlike Shorten),
> and
> these checksums are on the data stream, not the metadata, so any
> additional
> metadata shouldn't matter or change the internal checksums, right?
> 
> Then, while I was thinking about how this seek data would be used:
> Why not
> just have the Winamp/XMMS plugin create this extra seek data
> on-the-fly?
> This may be too CPU intensive, however.
> 
> 
> Sorry for the stream of consciousness email... I'm more thinking
> (typing)
> out loud than anything else... ;)
> 
> 
> ----------------------
> Mike Wren
> Server Team, Webmaster
> http://etree.org
> 
> 
> 
> -----Original Message-----
> From: flac-dev-admin at lists.sourceforge.net
> [mailto:flac-dev-admin at lists.sourceforge.net]On Behalf Of Josh
> Coalson
> Sent: Sunday, April 15, 2001 2:07 AM
> To: flac-dev at lists.sourceforge.net
> Subject: [Flac-dev] new SEEKTABLE block
> 
> 
> I've checked in code that supports a new metadata block called
> SEEKTABLE.  Basically, it is an optional, arbitrarily-long list
> of seek points, by sample number and stream offset.  I also added
> command-line options to flac so you can specify seek points by
> specific sample number and/or a specific number of evenly-spaced
> seek points.  The table cost about 18 bytes per seek point.
> 
> This seems to radically speed up seeks.  I should point out a
> SEEKTABLE is optional; FLAC doesn't need it to seek but they can
> help.  And 1% resolution within a stream only costs 1808 bytes.
> 
> Josh


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