Bug 904775

I write a patch ( ubuntu gnomeradio version ) to support for looping back audio through alsa devices ( including mixer control ).

Should be tested in several types of tv/fm tuners and then all the work will be made ​​public.

Package for ubuntu is here: https://launchpad.net/~geoubuntu/+archive/test

Best regards.

post the output of alsa-info.sh


did you connect your radio to line in or aux of your onboard sound ?

My radio tuner is connected to line in.

In function of your tuner, change "Mixer Source" from "Preference" to:

default/Line or
default/CD or
hw:0/Line or
etc.

Created attachment 690203 [details]
alsa info

you have to unmute  line playback switch and change line playback volume using alsamixer -c0

no need to change capture source to line since you are using the analog mixer of AC97 codec to mix the input signal from line in to line out 

set line playback to 0dB 

amixer -c 0 set Line playback 72% unmute


the output volume is controlled by master playback volume and switch


Simple mixer control 'Line',0
  Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-exclusive penum
  Capture exclusive group: 0
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: Playback 0 - 31
  Front Left: Playback 0 [0%] [-34.50dB] [off] Capture [off]
  Front Right: Playback 0 [0%] [-34.50dB] [off] Capture [off]



control.18 {
		iface MIXER
		name 'Line Playback Switch'
		value false
		comment {
			access 'read write'
			type BOOLEAN
			count 1
		}
	}
	control.19 {
		iface MIXER
		name 'Line Playback Volume'
		value.0 0
		value.1 0
		comment {
			access 'read write'
			type INTEGER
			count 2
			range '0 - 31'
			dbmin -3450
			dbmax 1200
			dbvalue.0 -3450
			dbvalue.1 -3450
		}
	}

Probably one of the most popular questions I see new users ask about gnomeradio is along the lines of the following:

    "It looks like gnomeradio is working (showing me gui), but for some reason I am not hearing any audio. What is wrong with my tuner?"

    Unfortunately, in the vast majority of cases, there is nothing wrong with the tuner. The problem is that gnomeradio was originally designed to be used with older tuner cards that have a dedicated audio output cable, which you are expected to connect to speakers. Most newer tuner products deliver their audio via an ALSA device, for which gnomeradio has no mechanism to route the audio to soundcard.

    As a result, users end to run sox or arecord/aplay in a separate terminal window (which always seemed like a rather ridiculous workaround).

    Solution: Added support for looping back audio through alsa devices. This feature automatically get an alsa device associated with a radio device. It will start an audio streaming between the radio device and the audio output device.

SCREENSHOT: Gnomeradio working with alsa https://launchpadlibrarian.net/135293108/gnomeradio_alsa.png

Package for ubuntu is here: https://launchpad.net/~geoubuntu/+archive/test-ppa/+sourcepub/3047676/+listing-archive-extra

Gnomeradio loopback digital audio from radio device: https://launchpadlibrarian.net/135415302/Gnomeradio%20alsa%20loopback.png

as only desktop computer cab install those tuner and desktop has line in (blue Jack) and thosr
e audio codec still have line playback volume control

it is just waste of CPU to use any loopback when your have the hardware mixer

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