[linux-dvb] Re: Streaming from hard disk

[Holger Waechtler <holger@convergence.de>]

Gert-Jan van Dijk wrote:
> > > to switch between different streams from network streaming servers) and
> > > some code that registers a software demux and calls the
> dvb_dmx_swfilter()
>
> > > callback with the data read from disk or a network connection. Since
> > > multiple people asked for a solution like this we highly welcome patches
> > > implementing such a debugging driver.
>
> That's a good idea. I just took a glance at the dummy code, and I'll start
> from there. Thanks, and rest asure that I'll share the stuff I make when I
> get it to work, no worries.
feel free to ask on this list if you need help understanding or 
implementing the internal driver API, this is unfortunally not too well 
documented, sorry.

> > The tricky part is the timing of the TS playback. For the
> > av7110 driver the dvr device slurps data as fast as the
> > disk can deliver it, unless you set a video and/or audio PID
> > with DMX_OUT_DECODER in which case the MPEG decoder controls
> > the timing.
>
> That seems logical, so we need to control the speed by also giving it a
> symbolrate. That's also what you do on most of the streamers (some determine
> this by parsing the tables, others don't). So have to look into the decoder
> to see how it controls timing, and then make it configurable via symbolrate.
> Thanks, this is grand....
You can guess/calculate the stream rate either by parsing the stream 
headers (to keep the deltaPCR/deltaTime rate or deltaPTS/deltaTime rate 
constant or even more sophisticated use the mux rates encoded in the 
headers) or simpler use the symbolrate passed to the frontend device -- 
then you can easily adjust this from userspace according to your needs.

Holger



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