On Tue, 6 Apr 2004, Tom Browne wrote:
> Clemens Ladisch wrote:
> >> state: PREPARED
> > The pcm isn't (yet) running.
> >
> >> avail : 5
> > And the buffer is almost full. snd_pcm_writei blocks because it
> > cannot write more data to the buffer, probably because the transfer
> > threshold is too high.
>
> ?! See below...
>
> > How do you start the pcm? If you're using the start threshold, it may
> > be too big, too.
>
> The code is based on alsa-lib/test/pcm.c using the poll method, so if you
> look at that, you'll see how most of the parameters are set in my code. I
> had to change to alsa_buffer_size-1 after upgrading to ALSA 0.9rc6 (I was
> using rc2, if memory serves) otherwise it never started playing... it seems
> something had changed in alsa-lib around this time.
>
> alsa_buffer_size = snd_pcm_hw_params_get_buffer_size(params);
> err = snd_pcm_hw_params_set_period_time_near(handle, params,
> alsa_period_time, &dir);
> alsa_period_size = snd_pcm_hw_params_get_period_size(params, &dir);
> ...
> err = snd_pcm_sw_params_set_start_threshold(handle, swparams,
> alsa_buffer_size-1)
It's not correct and it was never correct, but the pcm.c was buggy, too.
Look to the latest version.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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