Recording from Microphone

Recording from Microphone

[Eduardo Morras]

Hello, I'm starting to develop with this library.

I'm trying to use libsox in my application to record voice from microphone and process it. I have read the mans and examples*.c but found no example on how to do that, should I read from stdin? Has libsox 

I read sox.c and rec work is defined on lines 2936-2943, but don't know where the microphone is set.

The manual page for libsox(3) name the sox_open_input / sox_open_output but don't define them on head of man page.

Any clue?

Thanks

---   ---
Eduardo Morras <emorrasg@yahoo.es>

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Re: Recording from Microphone

[Eduardo Morras]

On Mon, 22 Jun 2015 09:40:03 +0000
"Mohita Singhal - ERS, HCL Tech" <mohita.singhal@hcl.com> wrote:

> I have used libalsa to do the recording from microphone.
> You can refer below links.
> 
> http://www.alsa-project.org/alsa-doc/alsa-lib/pcm.html
> http://www.linux.org.ru/forum/development/5473174

Yes, I know I can do it from alsa but I want to do it with sox because it abstracts me from underlayer audio system, and my app will not need install alsa if there is other audio i/o available or care to install it (with all the problems it may cause).
 
Does anyone know if "sox_open_input" and "sox_open_output" functions were renamed to "sox_open_read" and "sox_open_write"?

Thanks

> Regards
> Mohita

---   ---
Eduardo Morras <emorrasg@yahoo.es>

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Re: Recording from Microphone

[keghn]

http://sourceforge.net/p/sox/code/ci/master/tree/src/











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Re: Recording from Microphone

[Eduardo Morras]

On Tue, 23 Jun 2015 18:26:34 -0700 (MST)
keghn <keghn@netscape.net> wrote:
> 
> http://sourceforge.net/p/sox/code/ci/master/tree/src/
> 

Yes, I'm diving in the source code, as I said I found where the rec work begins (sox.c line 2936), then the setup of the default device (2661) and so on, but don't know where the microphone is selected or how.

I'm doing this now (borrowed from a question on stackoverflow):

sox -d -e ms-adpcm --endian little -b 8 -c 1 -r 8000 -t ul -silence 1 0.3 3% 1 0.3 3% | myapp 

My app uses libsox to process the audio piped from sox, but I want to do everything in my app, even the microphone record.

Thanks again


---   ---
Eduardo Morras <emorrasg@yahoo.es>

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Re: Recording from Microphone

[keghn]

 
sox -b 32 -r 96000 -c 2 -t alsa hw:0,0 ./recording.wav

hw:< is your card>,<is your recording device on that card>

 In a BASH terminal type, for a list of capture devices:

arecord -l


and:

arecord -L


 In a BASH terminal type, for a list of playing devices:

aplay -l

and:

aplay -L


http://superuser.com/questions/53957/what-do-alsa-devices-like-hw0-0-mean-how-do-i-figure-out-which-to-use
http://alsa.opensrc.org/MultipleCards







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Re: Recording from Microphone

[keghn]

http://portaudio.com/docs/v19-doxydocs/pa__devs_8c_source.html

gcc pa_devs.c -lportaudio -o pa_devs

 Just tested it, and it work on Mint Linux 64 bit OS, Mate. A Debian distro. 



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