[maemo-developers] Using available DSP tasks

[From: Daniel Charles]

On Jan 1, 2008 12:32 PM, Simon Pickering <S.G.Pickering at bath.ac.uk> wrote:
> Quoting Daniel Charles <dcharlesm at gmail.com>:
>
> > See the merged pipeline below
>
> >> Yes, this is certainly doable already. I don't have any G7.11 data to
> >> hand, but have tried it by mixing ogg and mp3 data (ogg using Tuomas
> >> Kulve's gstreamer plugin which uses the pcm dsp sink).
> >>
> >> E.g. These two commands can be run is separate terminal windows and
> >>  are mixed:
> >>
> >> gst-launch-0.10 filesrc location=20-16000HzExp5sec.mp3 ! dspmp3sink
> >>
> >> gst-launch-0.10 filesrc location=opensource.ogg  ! application/ogg !
> >> tremor ! dsppcmsink
> >
> > gst-launch-0.10 filesrc location=20-16000HzExp5sec.mp3 ! dspmp3sink \
> > filesrc location=opensource.ogg  ! application/ogg !
> > tremor ! dsppcmsink
> >
> > This way you can be sure that both pipelines are running on a single
> > process.  I'm not certain it is going to work as expected due to
> > constraints with two audio streams running at the same time, but you
> > can write as many source->filter->sink pipelines in a single
> > gst-launch as you want.
>
> Thank you very much. Is the backslash optional? Was it there just to
> indicate a line continuation (my email client has wrapped the
> following line too) or is it the correct way to separate the different
> parts of the pipeline?

Yes it is a line continuation, normally in a command prompt you can
either type (copy/paste) the entire line or with the back slash for
read clarity but it is optional.
>
> In any case your command (with or without backslash) produces the
> desired behaviour and both files play.

I'm glad to hear that it worked :)

Daniel
>
> Cheers,
>
>
> Simon
>
> P.S. Just to test that the karaoke idea will work I tested MP3 and
> G7.29 data (I couldn't find any G7.11 data to test) and they play
> together without troubles:
>
> E.g.
> gst-launch-0.10 filesrc location=20-16000HzExp5sec.mp3 ! dspmp3sink
> filesrc location=./audio-temp/transfer.g729  ! dspg729sink
>
>