[ecasound] ecasound and ALSA (Re: 0.9.0beta1 is out)

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Subject: [ecasound] ecasound and ALSA (Re: 0.9.0beta1 is out)
From: Kai Vehmanen (kaiv@wakkanet.fi)
Date: Thu Feb 22 2001 - 13:52:52 EET

Ok, this bug is now fixed in the ALSA CVS-tree. As far as I know, the
latest ecasound (1.9dev3 in the CVS-tree) now works without problems with
ALSA. Here's a short syntax summary:

# ALSA pcm-device names, here device "sb" is used
# for playback (defined in ~/.asoundrc)
ecasound -i file.wav -o alsa,sb

# explicit ALSA pcm-hw access (card, device[, subdev])
ecasound -i file.wav -o alsahw,0,0

# explicit ALSA pcm-plugin access
ecasound -i file.wav -o alsaplugin,0,0

# ALSA OSS-emulation (snd-*-oss modules loaded)
ecasound -i file.wav -o /dev/dsp0

# OSS-emulation with libaoss (only native ALSA modules loaded)
export LD_PRELOAD=libaoss.so
ecasound -i file.wav -o /dev/dsp0

... and of course, same syntax for capture/recording. As for
playback reliability and latency, here're some useful ecasound options:

-r
        - change to SCHED_FIFO scheduling (requires root priviledges)
-z:db
        - use double-buffering for disk i/o (defaults to 100000 sample
          frames per audio object)
-z:nointbuf
        - limit buffering done by ALSA to 3 fragments
-z:xruns
        - stop if under/overruns occur
-b:sample_frames
        - set internal buffersize (=fragment size, period time, etc),
          defaults to 1024 sample frames
        
On Thu, 22 Feb 2001, Abramo Bagnara wrote:

> Kai Vehmanen wrote:
> >
> >
> > 2) .. but fails with snd-pcm-oss modules
> >
> > - /dev/dsp opened in o_wronly mode
> > - SNDCTL_DSP_GETCAPS ioctl reports that trigger is supported
> > - SNDCTL_DSP_SETTRIGGER fails with errno 77
>
> Fixed now.
>
> 

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