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RobbieThe1st is offline RobbieThe1st
2010-10-17 , 11:45
Posts: 842 | Thanked: 1,197 times | Joined on May 2010
#1
Quick little question: Is there a way to take the input from the onboard microphone and send it out on the earphone port? Essentially a "hearing aid" or remote microphone app?

I want to do it so I can use a 3.5MM male-male connector to connect it to the line-in jack on my desktop, when my other mics aren't available.
I did this with my last mp3 player, an iRiver H320 with Rockbox on it - It worked out great. I'm just trying to figure out how I can do it with my N900.
Last edited by RobbieThe1st; 2010-10-18 at 07:03.
 
adalal is offline adalal
2010-10-17 , 11:49
Posts: 100 | Thanked: 19 times | Joined on Jan 2010
#2
i know this is possible on a full pulseaudio installation, where you set the output as a monitor of an input, but im not sure if maemo's stripped down pulseaudio system has that feature
 
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MohammadAG is offline MohammadAG
2010-10-17 , 12:04
Posts: 2,473 | Thanked: 12,265 times | Joined on Oct 2009 @ Jerusalem, PS/IL
#3
arecord | aplay, monitor how the phone app changes alsa switches to reroute audio to the earphone.
I'm not sure how you could remove the delay though.
 
mr id is offline mr id
2010-10-17 , 13:14
Posts: 237 | Thanked: 193 times | Joined on Feb 2010 @ Brighton, UK
#4
assuming you have gstreamer tools isntalled, at a terminal prompt:

gst-launch pulsesrc device=source.hw0 ! audioconvert ! volume volume=2.5 ! pulsesink device=sink.hw0

As M.AG says you will experience a delay between audio in and routing out but depending on the applicaiton you want to put it to this may not be a killer for you.

I've added a dash of volume as I find the output a little quiet otherwise. Feel free to change the value to taste.
 

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RobbieThe1st is offline RobbieThe1st
2010-10-18 , 07:03
Posts: 842 | Thanked: 1,197 times | Joined on May 2010
#5
mr id's solution works, and isn't terribly laggy. I'll call that good.
 
nokix is offline nokix
2010-11-25 , 02:35
Posts: 99 | Thanked: 24 times | Joined on Feb 2010
#6
this is a brilliant idea! one question though: is it necessary to "deactivate" it afterwards and how? i've just found out about this thread and i'll give it a try after i find out if deactivation is needed.
 
mr id is offline mr id
2010-11-25 , 07:42
Posts: 237 | Thanked: 193 times | Joined on Feb 2010 @ Brighton, UK
#7
no. but you would terminate it though. ctrl+c at the terminal where it's running (or just close the terminal window).
 

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nas is offline nas
2011-01-09 , 20:10
Posts: 5 | Thanked: 6 times | Joined on Jun 2010
#8
Hello,

After some experiments, I found out the following command that allowed me to make my bluetooth hands free work like talkietalkie with my n900, having headset:

gst-launch pulsesrc device=source.hw1 ! audioconvert ! volume volume=100 ! pulsesink device=sink.hw0 pulsesrc device=source.hw0 ! audioconvert ! volume volume=100 ! pulsesink device=sink.hw1



also if you want only to listen from the bluetooth handsfree microphone to the phone:

gst-launch pulsesrc device=source.hw1 ! audioconvert ! volume volume=100 ! pulsesink device=sink.hw0

Enjoy
 

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