[Vorbis-dev] Is it possible to seek different Ogg Vorbis encoded packets from the File?

[Niranjan Udipi]

Can the Vorbis codec be used to encode/decode 5.1 surround sound? Any
pointers to this?

Thanks in anticipations,
Niranjan


On Fri, Oct 23, 2009 at 7:02 AM, Gregory Maxwell <gmaxwell at gmail.com> wrote:

> On Thu, Oct 22, 2009 at 8:40 PM, Niranjan Udipi <ucniranjan at gmail.com>
> wrote:
> > Thank you very much for the detailed description. I request you to
> elaborate
> > what is 'fine-grained parallelism' in Tremor, with an example.
> >
> > Another thought is to split the OggVorbis encoded data in to four nearly
> > equal PCM length parts, once all the Headers have been decoded. Then,
> decode
> > each part separately in a new thread. In this case, only at the beginning
> > and end of the divided data parts, i.e. the first and last packets need
> the
> > previous and next packet respectively, for decoding. Please comment on
> this
> > idea. Please suggest me what functions I will have to use, to implement
> this
> > scheme.
>
> Refer to section 4.3.8 of the Vorbis specification:
> http://www.xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-790004.3.8
>
> The vorbis frames represent overlapping portions of audio.
>
> You could decode the frames in parallel but must then sum the
> overlapping parts. This will require fairly extensive modification to
> the decoder. I do not believe that anyone here has investigated making
> this change so you would need to determine the best approach yourself.
>
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