[linux-dvb] Re: converting PES to TS while reading from (multiple)/dev/ost/demux0

["Felix Domke" <tmbinc@gmx.net>]

> Which is AFAIK a rather nasty limitation of the current API.
> As far as I know there is no way to find out where exactly
> payload_unit_start_indicator bits were set when you read from
> a demux device. You need to read TS packets from dvr if you want
> to have the payload_unit_start_indicator bits. But dvr
> only supports one concurrent opener...
It *IS* a nasty limitation.

I would prefer:

DMX_SET_PES_FILTER

with two new options:

a.) type, like "TRANSPORT" (all 188 bytes), "PAYLOAD" (like the deafault)
and maybe a "read one payload unit as once", maybe with a header (with the
size and - maybe - things like the adaption field, but maybe this is exactly
what AV_PES did.. i don't know. so maybe just "PAYLOAD" and if you want to
get the PUSI-flag "TRANSPORT")
b.) the estimated datarate, or more low-level, the amount of data which
should be available until an interrupt occurs.

The absence of b.) leads to high system load if you break up a fast stream
(Video/Audio, EIT) into many small packets, or, if you use a big "buffer
size" (or "interrupt threshold") to the problem that you cannot read ONE
small packet (for low datarate streams, like PAT/PMT or even NIT).

A huge company did a nice api for using their chipset with Linux, it very
much like the OST-Api, but has this new options. I really miss them in the
OST.


bye,
felix



-- 
Info:
To unsubscribe send a mail to listar@linuxtv.org with "unsubscribe linux-dvb" as subject.