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 availa
>Ok. Sorry to be so pedantic, it must be some small small error, but...
>
>1. what does snd_pcm_avail_update() do and what does its return value mean?
it checks on the h/w pointer to discover how much data/space is
actually available. it returns the space (in units of frames). if
there has been
On Wed, 17 Oct 2001, Paul Davis wrote:
> >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? :))
Ok. Sorry to be so pedantic, it must be some small small error, but...
1. what
>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
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_PLAY
>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_updat
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:
> >
>
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. thank
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 (GstElem
