[LAU] Simple loop playing from command line

[Ken Restivo]

On Tue, Jan 11, 2011 at 09:40:14AM +0100, Lorenzo Sutton wrote:
> Hi,
>
> Ken Restivo wrote:
>> I'm trying to figure out a way to play a simple loop from the command line. It doesn't need to be synchronized with anything (our drummer will be talking over it).
> If you have mplayer with jack support you could do something like this:
>
> mplayer -ao jack loopfile.wav -loop 0
>
> (-loop 0 means forever)

That leaves a 1-second gap between plays, which doesn't exactly work for a loop.

-ken
------------
>> I found this archive:
>>
>>   http://comments.gmane.org/gmane.comp.audio.ecasound.general/3843
>>
>>   But there seems to be no "audioloop" in ecasound (I have  2.4.6.1-2 ).
>>
>> The man page I have on my system mentions "-tl", so I tried that, and it zombified jack (not good).
>>
>> Here is what I tried;
>>
>> $ ecasound -f:f32_le,2,48000 -t:3600 -a:1 -i:audioloop,johnloop48.wav  -a:all -o jack_auto
>>   does nothing, just tells me three tims that it is using realtime-scheduling:
>>   - [ Engine init - Driver start ]
>> (eca-engine) Using realtime-scheduling (SCHED_FIFO:50).
>> (eca-engine) Using realtime-scheduling (SCHED_FIFO:50).
>> (eca-engine) Using realtime-scheduling (SCHED_FIFO:50).
>>
>> Hmm. Goole says try "notransport". So I do.
>>
>> $  ecasound -f:f32_le,2,48000 -G:jack,ecasound,notransport -tl -a:1 -i:audioloop,johnloop48.wav  -a:all -o jack_auto
>> 	does nothing, just goes:
>> 	- [ Engine init - Driver start ]
>> (eca-engine) Using realtime-scheduling (SCHED_FIFO:50).
>> and then hangs, but at least that tells me only once that it's realtime-scheduling
>>
>> OK, how about doing what the docs say?
>>
>> $ ecasound -f:f32_le,2,48000 -G:jack,ecasound,notransport -tl -a:1 -i:johnloop48.wav  -a:all -o jack_auto
>>    plays the loop once, then zombifies
>>    (eca-engine) Using realtime-scheduling (SCHED_FIFO:50).
>> zombified - calling shutdown handler
>> (eca-engine) WARNING: Engine has raised an error! Possible causes: connection
>> ... lost to system services, unable to adapt to changes in operating environment, etc.
>> - [ Controller/Batch processing finished (-3) ] --------------------------------
>> ecasound: Warning! Errors detected during processing.
>> (eca-control-objects) Disconnecting chainsetup: "command-line-setup".
>>
>> At least I got sound out of it though.
>>
>> Are there any other command-line tools I could use to loop a wav file, possibly simpler and less weird than ecasound?
>>
>> I guess I could write one, just read the bytes out of a wav file in a loop, and dump it into the jack process callback, wouldn't be too hard. But if something already exists, then I'd rather use that.
>>
>> Thanks!
>>
>> -ken
>> _______________________________________________
>> Linux-audio-user mailing list
>> Linux-audio-user at lists.linuxaudio.org
>> http://lists.linuxaudio.org/listinfo/linux-audio-user
>>
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
> http://lists.linuxaudio.org/listinfo/linux-audio-user