[vorbis-dev] Packet Granule position

[Michael Smith]

On Saturday 27 March 2004 01:36, Adriano Almeida wrote:
> Is there a way to know the exact packet granule position before I decode
> it? is there any relationship between packet size and granule position? I
> know each page has its own granule position, can i calculate it for each
> packet??
>

Calculating per-packet granulepos values is possible, but non-trivial. It 
requires several things:
 - The page granulepos (you may have to use this to adjust the final 
calculated granulepos).
 - The previous packet granulepos (you can use a page granulepos here instead 
if you want to start from some arbitrary point)
 - The previous packet blocksize.
 - The current packet blocksize.

The latter requires partial decode of the packet (it's in the first few bits 
somewhere), as well as header information.

Mike

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