On Sun, Nov 05, 2006 at 09:32:44PM +0200, Oded Shimon wrote:
> On Sun, Nov 05, 2006 at 07:07:22PM +0100, Michael
Niedermayer wrote:
> > On Sun, Nov 05, 2006 at 09:48:46AM +0200, Oded
Shimon wrote:
> > > On Sun, Nov 05, 2006 at 12:19:53AM +0100,
Michael Niedermayer wrote:
> > > > the big problem with simply allowing
arbitrarily placed info is that it
> > > > makes the info useless for the normal
nut file case as the info cannot be
> > > > found its like a dvd with chapters but
the information about where the
> > > > chapters begin is stored at the begin of
the chapters, you end up with
> > > > a O(n) search ...
> > > > so ive some concerns with just saying
its ok for streaming, as that
> > > > leads to nut files laying around which
are encoded for streaming ...
> > >
> > > The proposal I had for this is - info packets
not written after main
> > > headers are only allowed in real time
streaming, and must have
> > > chapter_id!=0, and any info packets written
after main headers, both in
> > > file and in streaming scenario, MUST be
repeated together with all main
> > > headers. No demuxer would have to search
anything past main headers, any
> > > info packets given during demuxing is
"information update". In the file
> > > scenario, all info must be written after the
main headers, so no searching
> > > necessary.
> >
> > hmm, rich what is your oppinion about that? iam
unsure if iam against it
> > or not ...
>
> - ods15
Objections? Commit? 48 hour notice from now.
- ods15
> Index: DOCS/tech/nut.txt
>
============================================================
=======
> --- DOCS/tech/nut.txt (revision 20666)
> +++ DOCS/tech/nut.txt (working copy)
>  -180,11 +180,15
> packet_header, index_packet, packet_footer
> }
> if (!eof) while(next_code != main_startcode){
> - if(next_code == syncpoint_startcode){
> - packet_header, syncpoint,
packet_footer
> + packet_header, syncpoint, packet_footer
> + do{
> + frame
> + }while(next_code == framecode);
> + reserved_headers
> + if (realtime_stream) while(next_code ==
info_startcode){
> + packet_header, info_packet,
packet_footer
> + reserved_headers
> }
> - frame
> - reserved_headers
> }
> }
>
> -836,9 +840,15
> Info:
> -----
>
> -If a info packet is stored anywhere then a muxer MUST
also store an identical
> +All info packets stored after a main header set MUST
also have an identical
> info packet after every main-stream-header set
>
> +All info packets not stored after a main header set
MUST have
> +chapter_id!=0 .
> +
> +Info packets MUST be written after main header sets in
non realtime
> +streams.
> +
> If a demuxer has seen several info packets with the
same chapter_id and
> stream_id then it MUST ignore all but the one with the
highest position in
> the file
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