[gst-devel] Separate audio feeds to front/side/rear channels

[drunkahol]

I've got an issue at work requiring the streaming of TV audio feeds to a
telephone system to let the traders listen to TV channels by dialing the
right number.  I am using gst-launch to capture the 6 channels as separate
left/right stereo channels and send them across the network. 

For simplicity, I had hoped to play these 3 stereo feeds through
front/side/rear channels of a single suitable sound card, but am having
problems. 

Whilst the following works 

# gst-launch audiotestsrc volume=0.250 freq=300 ! audioconvert ! alsasink
device=front & 
# gst-launch audiotestsrc volume=0.250 freq=400 ! audioconvert ! alsasink
device=side & 
# gst-launch audiotestsrc volume=0.250 freq=500 ! audioconvert ! alsasink
device=reat & 

(although only as root) I get the right tone in each channel. 

But, 

# gst-launch filesrc location=test.ogg ! decodebin ! audioconvert ! alsasink
device=front & 

gives me: 
Setting pipeline to PAUSED ... 
Pipeline is PREROLLING ... 
ERROR: from element
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstOggDemux:oggdemux0:
Internal data stream error. 
Additional debug info: 
gstoggdemux.c(3450): gst_ogg_demux_loop ():
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstOggDemux:oggdemux0: 
stream stopped, reason not-negotiated 
ERROR: pipeline doesn't want to preroll. 
Setting pipeline to NULL ... 
Freeing pipeline ... 

Leaving the "device=front" part off allows the audio to play. 

Is there something I need to do to get the Ogg stream in the right format to
play back on front/side/rear? Also, is there any way of listing which
devices are available for alsasink?  I've poked around endlessly with alsa
configs etc and there doesn't seem to be anything.

Thanks 

Duncan 

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