[ogg-dev] Does ogg segments include more than one Vorbis frame

[Johnslion Woo]

Hi, Ralph:

    That's really helpful, thank you very much!

Best Regards,
Johnslion


On Tue, Apr 9, 2013 at 12:18 AM, Ralph Giles <giles at thaumas.net> wrote:

> On 13-04-08 4:34 AM, Johnslion Woo wrote:
>
> >      Does anybody know is it allowed for the OGG segment including more
> > than one Vorbis frame?  Or should I consider about that?
>
> Vorbis frames (packets) are split into ogg segments, not the other way
> around. If the packet is < 255 bytes, it just goes in a single segment
> by itself.
>
> So if you have a sequence of packets with lengths of 24, 156, 720 and
> 203 bytes, those would be divided and packed into segments of length:
>
>   24, 156, 255,255,210, 203
>
> You know where the boundaries between the packets are because they're
> where the segment length values in the lacing table are less than 255.
>
> The point of segmentation is it provides a sort of unary encoding of the
> packet boundaries. You can pack up to 255 segments into an ogg page, and
> use the lacing table to find the boundaries. This design gives a good
> tradeoff between header overhead and read complexity.
>
> Does that answer your question?
>
>  -r
>
>
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