[gst-devel] FM radio using v4lsrc

[Alexey Chernov]

В сообщении от Вторник 16 февраля 2010 18:54:40 вы написали:
> hi,
> 
> 4ernov wrote:
> > Hello,
> > we develop an application receiving FM radio based on GStreamer. But I
> > can't understand how to create a pipeline with v4lsrc or v4l2src only
> > for radio signal (without video). I tried
> >
> > gst-launch -vvv v4l2src device=/dev/radio0 ! decodebin ! pulsesink
> 
> this cannot work. v4l2cards don't capture audio - they simple have an
> analog connection to your sound card. You can only use the tuner
> interface on v4l2 to tune the station. And you could capture from
> alsasrc (need to set the right capture device).

Stefan, thank you for this suggestion. Could you please help me with the 
pipeline configuration for this case? I tried today to put v4l2src, alsasrc, 
audioconvert, audioresample, pulsesink to the pipeline and linked everything 
except v4l2src. But I couldn't get it work, on setting READY state v4l2src 
printed an error with message "Device or resource is busy". Should I put audio 
elements and v4l2src in different pipelines? Or maybe I should operate on 
v4l2src without any pipeline. I'll continue my experiments tomorrow.

> 
> Stefan
> 
> > in command line at first, but it fails:
> >
> > (gst-launch-0.10:2489): GLib-WARNING **: g_set_prgname() called
> > multiple times
> > Setting pipeline to PAUSED ...
> > ERROR: Pipeline doesn't want to pause.
> > ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Device
> > '/dev/radio0' is not a capture device.
> > Additional debug info:
> > v4l2_calls.c(504): gst_v4l2_open ():
> > /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
> > Capabilities: 0x50400
> > Setting pipeline to NULL ...
> > Freeing pipeline ...
> >
> > Could anybody suggest me the right pipeline for FM radio signal
> > processing or maybe the right parameters for v4lsrc or v4l2src sources?
> >
> > Thank you very much in advance,
> > Alexey Chernov
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