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.
IMO the test case should be a 16bit file because this is the CD standard.
-------
aplay -v -M -f cd -D plughw audio.wav
Playing WAVE 'audio.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Plug PCM: Route conversion PCM (sformat=S32_LE)
Transformation table:
0 <- 0
1 <- 1
2 <- none
3 <- none
4 <- none
5 <- none
6 <- none
7 <- none
8 <- none
9 <- none
10 <- none
11 <- none
12 <- none
13 <- none
14 <- none
15 <- none
16 <- none
17 <- none
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 44100
exact rate : 44100 (44100/1)
msbits : 16
buffer_size : 8192
period_size : 4096
period_time : 92879
tick_time : 10000
tstamp_mode : NONE
period_step : 1
sleep_min : 0
avail_min : 4096
xfer_align : 4096
start_threshold : 8192
stop_threshold : 8192
silence_threshold: 0
silence_size : 0
boundary : 1073741824
Slave: Hardware PCM card 0 'Hammerfall DSP' device 0 subdevice 0
Its setup is: stream : PLAYBACK access : MMAP_NONINTERLEAVED format : S32_LE subformat : STD channels : 18 rate : 44100 exact rate : 44100 (44100/1) msbits : 24 buffer_size : 8192 period_size : 4096 period_time : 92879 tick_time : 10000 tstamp_mode : NONE period_step : 1 sleep_min : 0 avail_min : 4096 xfer_align : 4096 start_threshold : 8192 stop_threshold : 8192 silence_threshold: 0 silence_size : 0 boundary : 1073741824 underrun!!! (at least 683.032 ms long) Status: state : XRUN trigger_time: 1073628220.377968000 tstamp : 1073628221.60968000 delay : 0 avail : 8192 avail_max : 8192 underrun!!! (at least 280.077 ms long) Status: state : XRUN trigger_time: 1073628222.812390000 tstamp : 1073628223.92462000 delay : 0 avail : 8192 avail_max : 8192 underrun!!! (at least 179.903 ms long) Status: state : XRUN trigger_time: 1073628224.413069000 tstamp : 1073628224.592968000 delay : 0 avail : 8192 avail_max : 8192 underrun!!! (at least 143.721 ms long) Status: state : XRUN trigger_time: 1073628225.185560000 tstamp : 1073628225.329276000 delay : 0 avail : 8192 avail_max : 8192 underrun!!! (at least 9.202 ms long) Status: state : XRUN trigger_time: 1073628225.729596000 tstamp : 1073628225.738793000 delay : 0 avail : 8192 avail_max : 8192 underrun!!! (at least 126.904 ms long) Status: state : XRUN trigger_time: 1073628227.274901000 tstamp : 1073628227.401799000 delay : 0 avail : 8192 avail_max : 8192 underrun!!! (at least 225.002 ms long) Status: state : XRUN trigger_time: 1073628227.898006000 tstamp : 1073628228.123003000 delay : 0 avail : 8192 avail_max : 8192 underrun!!! (at least 163.350 ms long) Status: state : XRUN trigger_time: 1073628229.57122000 . . . ------
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.
Hmm. This would appear to be a problem. While I'm not ecouraging people to use the hdsp as a standard consumer playback device... My customer (who runs windows mostly) is expecting to be able to view videos etc with this device simply because he can in his windows env. Should I be encouraging him to purchase a second card or can this be fixed using ALSA?
-- Patrick Shirkey - Boost Hardware Ltd. Http://www.boosthardware.com Http://www.djcj.org - The Linux Audio Users guide ========================================
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