[alsa-devel] Is calling snd_pcm_sw_params() mandatory ?
Twas brillig, and Raymond Yau at 24/07/10 04:51 did gyre and gimble: 2010/7/15 Colin Guthrie <gmane <at> colin.guthr.ie>
Can I remove pulseaudio from mandriva 2000 ?
I just want to test *libcanberra*-alsa alone ( i.e. *libcanberra* without pulseaudio )
when PA server abort, and *libcanberra*-pulse cannot connect to PA server ,
Will *libcanberra* use *libcanberra*-alsa connect to PA using alsa-pulse plugin ?
Use draksound (or via Mandriva Control Center) to disable pulseaudio and the ALSA backend for canberra should be used instead.
It's based on the alternatives system and the file /etc/sound/profiles/alsa/canberra.conf
Col
It is strange that the alsa back end of libcanberra (http://git.0pointer.de/?p=libcanberra.git;a=blob;f=src/alsa.c) does not call snd_pcm_sw_params()
Does alsa-lib has any check whether the application had called snd_pcm_sw_params() or it provide default values for those software parameters (e.g. start_threshold, stop_threshold) when the application only call snd_pcm_hw_params() and snd_pcm_prepare()
Raymond Yau wrote:
Does alsa-lib has any check whether the application had called snd_pcm_sw_params() or it provide default values for those software parameters (e.g. start_threshold, stop_threshold)
The internal snd_pcm_sw_params_default() function does this:
params->tstamp_mode = SND_PCM_TSTAMP_NONE; params->period_step = 1; params->sleep_min = 0; params->avail_min = pcm->period_size; params->xfer_align = 1; params->start_threshold = 1; params->stop_threshold = pcm->buffer_size; params->silence_threshold = 0; params->silence_size = 0;
Regards, Clemens
participants (2)
-
Clemens Ladisch -
Raymond Yau