[Libvisual-devel] jack inputs

[salsaman <sal...@xs...>]

>>    
>>
>If you need some help with jack, look at jack.c in LiVES, in particular 
>jack_open_device(). I will shortly be adding code to grab audio from jack.
>
>
>Hope this helps,
>Gabriel.
>
>
>  
>


Here you go, look at http://lives.cvs.sourceforge.net/lives/lives/src/jack.c

First I call jack_audio_read_init() [note that not all of the fields are 
actually used, for example, I don't use "mute" or "out_sample_rate" for 
my jack reader]. This is done when the app. starts up.

Then to initiate reading, I call:

jack_open_device_read() followed by jack_read_driver_activate(). This 
connects my jack inputs to the pcm_capture ports.

Jack will call the audio_read() callback each time a new audio buffer is 
ready. So you would presumably cache this somewhere in libvisual.

Finally, I call jack_close_device() to stop capture.


You can also look at audio.c, functions:
rec_audio_to_clip() and rec_audio_stop() to see how the jack functions 
are called.

Also in audio.c, you have the function:

sample_move_float_int() which will convert jack's float type samples to 
integer values if you need to.


HTH.

Gabriel.