On Thu, 18 Oct 2001, Paul Davis wrote:
IIRC, it reflects issues to do with the layout of the h/w buffer. the
results from mmap_begin() reflect the amount you can touch in one single
contiguous operation (e.g. memcpy). keep in mind that the h/w buffer
is a ring buffer, and the space available
Hi. I'm writing the alsa plugin for gstreamer. When I go to capture audio, my
loop eats the entire cpu. I set avail_min but still sometimes get out 32 frame
avail values. Here's the relevant portion:
/* shamelessly stolen from pbd's audioengine. thanks, paul! */
static void
gst_alsa_loop
In message [EMAIL PROTECTED]you write:
Hi. I'm writing the alsa plugin for gstreamer. When I go to capture audio, my
loop eats the entire cpu. I set avail_min but still sometimes get out 32 frame
avail values. Here's the relevant portion:
/* shamelessly stolen from pbd's audioengine. thanks,
On Wed, 17 Oct 2001, Paul Davis wrote:
In message [EMAIL PROTECTED]you write:
Hi. I'm writing the alsa plugin for gstreamer. When I go to capture audio, my
loop eats the entire cpu. I set avail_min but still sometimes get out 32 frame
avail values. Here's the relevant portion:
/*
there are two of these loops running separately, one for each
element, with separate handles, etc. I was thinking for some reason
that snd_pcm_update_avai l would block until avail_min frames were
available, but that's not the case. If I run the following pipeline,
I get:
snd_pcm_avail_update():
On Wed, 17 Oct 2001, Paul Davis wrote:
snd_pcm_avail_update(): this simply updates the information on the
number of available bytes. as you have noted, it does not block.
what is snd_pcm_set_avail_main() for, then?
your code does this:
if (this-stream == SND_PCM_STREAM_PLAYBACK)
I just came to a pseudo-epiphany, but I can't test it atm. Do I poll
on the fd , but set pfd.events = POLLIN | POLLERR?
there now, that wasn't too hard, was it? :))
the rest of the code should look identical.
note that audioengine (and now JACK) is technically in error because
it only polls
