At Thu, 08 Jan 2004 02:29:13 +0900,
Patrick Shirkey wrote:
>
> I am seeing strange things happen while using the hdsp and dmix plugin
> and aplay as a test app.
>
> JACK works perfectly.
>
> I can get sound from aplay if I use this commandline:
>
> aplay -f cd -D plughw audio.wav
> Playing WAVE 'audio.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
> Stereo
> underrun!!! (at least 40.147 ms long)
> underrun!!! (at least 86.223 ms long)
> underrun!!! (at least 145.116 ms long)
> underrun!!! (at least 79.109 ms long)
> underrun!!! (at least 248.555 ms long)
> underrun!!! (at least 180.442 ms long)
> underrun!!! (at least 96.117 ms long)
> Aborted by signal Interrupt...
>
> But I get an xrun every second or so which makes the card useless for
> native alsa apps .
i'm not sure which plugin plays wrong yet.
run aplay with -v option and see which plugins and what configurations
are used. for example, if the native hardware requires 32bit samples,
prepare 32bit samples WAV instead of 16bit, and reduce the plugin.
i don't think the rate conversion is used, so the plugins are linear,
route, and copy plugins.
my rough guess is the copy plugin. try aplay -M option, so that mmap
mode is used.
>
> aplay -f cd -D hw:0 audio.wav
> Playing WAVE 'audio.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
> Stereo
> aplay: set_params:822: Access type not available
hdsp supports only MMAP access.
aplay uses the RW access as default.
> If I try the dmix plugin (which also works with the pci card):
>
>
> pcm.!default {
> type plug
> slave.pcm "dmixer"
> }
>
> pcm.dmixer {
> type dmix
> ipc_key 1234
> slave {
> pcm "hw:0"
> period_time 0
> period_size 1024
> buffer_size 4096
> # periods 128
> rate 44100
> format s16_le
> }
> bindings {
> 0 0
> 1 1
> }
> }
>
> ctl.dmixer {
> type hw
> card 0
> }
>
> ------
> aplay -f cd -D default audio.wav
> ALSA lib pcm_hw.c:324:(snd_pcm_hw_hw_params) SNDRV_PCM_IOCTL_HW_PARAMS
> failed: Device or resource busy
> ALSA lib pcm_direct.c:712:(snd_pcm_direct_initialize_slave) unable to
> install hw params
> ALSA lib pcm_dmix.c:827:(snd_pcm_dmix_open) unable to initialize slave
> aplay: main:502: audio open error: Device or resource busy
hmm, it's wierd. -ENODEV ?
> ------
>
> For fun I tried this syntax:
>
>
> pcm.!default {
> type plughw
> slave.pcm "dmixer"
> }
>
>
> ------
> aplay -f cd -D default audio.wav
> ALSA lib pcm.c:1900:(snd_pcm_open_conf) Cannot open shared library
> /usr/lib/alsa-lib/libasound_module_pcm_plughw.so
> aplay: main:502: audio open error: No such file or directory
this one is clear. there is no plughw type.
it's a defined pcm name.
Takashi
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