I'm sorry about the previous mail. I happened to press the wrong
button and sent it prematurely. Anyway, I'll restart from the top:
Clemens Ladisch writes:
> Fredrik Tolf wrote:
> > Clemens Ladisch <[EMAIL PROTECTED]> writes:
> > > Use "aplay something.wav", or "aplay -Dplughw:X,Y something.wav",
> >
> > I did that, and to my surprise it yielded the same results,
> > ie. multiple aplay processes playing "short" streams blocked each
> > other while "long" streams wouldn't affect anything at all.
>
> There are informational files below /proc/asound/card0/pcm0p/subX/,
> where X is the subdevice number (your SB has 32). Please post the
> contents of hw_params, info, status, and sw_params for both "short"
> streams that are used when blocking (I guess the first two), and for
> both "long" streams not blocking.
>
Some more info. I just tried the following command (test.wav is a
"long" stream and click01.wav is a "short" one):
aplay test.wav & aplay test.wav & aplay click01.wav & aplay click01.wav &
So, all playbacks start (more or less) simultaneously. test.wav wasn't
blocked at all. In fact, they were playing so simultaneously that you
could hardly even hear any distortion due to phase difference. The
click01.wav playbacks were blocking each other, though. The first one
started playing as the test.wav playbacks started. In the light of
this, I guess that a "short" stream is qualified by the entire stream
fitting in a single playback buffer. I checked a little with strace on
short streams of different lengths, and it seems to be the case. The
first one that was larger than 8192 bytes (which is sox's buffer size)
did not block.
Anyway, I ran the above command again and appended the following to
it:
(cd /proc/asound/card0/pcm0p; \
for i in `seq 0 3`; do \
for f in hw_params info status sw_params; \
do echo sub$i/$f; \
cat sub$i/$f; \
done; \
done)
And here is the output:
sub0/hw_params
access: RW_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 44100 (44100/1)
period_size: 4096
buffer_size: 16384
tick_time: 1000
sub0/info
card: 0
device: 0
subdevice: 0
stream: PLAYBACK
id: emu10k1
name: EMU10K1
subname: subdevice #0
class: 0
subclass: 0
subdevices_count: 32
subdevices_avail: 28
sub0/status
state: RUNNING
trigger_time: 1066242726.149839000
tstamp : 1066242726.194418000
delay : 14417
avail : 1967
avail_max : 1967
-----
hw_ptr : 1967
appl_ptr : 16384
sub0/sw_params
tstamp_mode: NONE
period_step: 1
sleep_min: 0
avail_min: 4096
xfer_align: 4096
start_threshold: 16384
stop_threshold: 16384
silence_threshold: 0
silence_size: 0
boundary: 1073741824
sub1/hw_params
access: RW_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 44100 (44100/1)
period_size: 4096
buffer_size: 16384
tick_time: 1000
sub1/info
card: 0
device: 0
subdevice: 1
stream: PLAYBACK
id: emu10k1
name: EMU10K1
subname: subdevice #1
class: 0
subclass: 0
subdevices_count: 32
subdevices_avail: 28
sub1/status
state: RUNNING
trigger_time: 1066242726.152516000
tstamp : 1066242726.206890000
delay : 13985
avail : 2399
avail_max : 2399
-----
hw_ptr : 2399
appl_ptr : 16384
sub1/sw_params
tstamp_mode: NONE
period_step: 1
sleep_min: 0
avail_min: 4096
xfer_align: 4096
start_threshold: 16384
stop_threshold: 16384
silence_threshold: 0
silence_size: 0
boundary: 1073741824
sub2/hw_params
access: RW_INTERLEAVED
format: U8
subformat: STD
channels: 1
rate: 22050 (22050/1)
period_size: 2205
buffer_size: 11025
tick_time: 1000
sub2/info
card: 0
device: 0
subdevice: 2
stream: PLAYBACK
id: emu10k1
name: EMU10K1
subname: subdevice #2
class: 0
subclass: 0
subdevices_count: 32
subdevices_avail: 28
sub2/status
state: DRAINING
trigger_time: 1066242726.156046000
tstamp : 1066242726.219212000
delay : 3017
avail : 8008
avail_max : 8008
-----
hw_ptr : 1393
appl_ptr : 4410
sub2/sw_params
tstamp_mode: NONE
period_step: 1
sleep_min: 0
avail_min: 2205
xfer_align: 2205
start_threshold: 11025
stop_threshold: 11025
silence_threshold: 0
silence_size: 0
boundary: 1445068800
sub3/hw_params
access: RW_INTERLEAVED
format: U8
subformat: STD
channels: 1
rate: 22050 (22050/1)
period_size: 2205
buffer_size: 11025
tick_time: 1000
sub3/info
card: 0
device: 0
subdevice: 3
stream: PLAYBACK
id: emu10k1
name: EMU10K1
subname: subdevice #3
class: 0
subclass: 0
subdevices_count: 32
subdevices_avail: 28
sub3/status
state: SETUP
trigger_time: 0.000000000
tstamp : 1066242726.231504000
delay : 0
avail : 11025
avail_max : 0
-----
hw_ptr : 0
appl_ptr : 0
sub3/sw_params
tstamp_mode: NONE
period_step: 1
sleep_min: 0
avail_min: 2205
xfer_align: 2205
start_threshold: 1
stop_threshold: 11025
silence_threshold: 0
silence_size: 0
boundary: 1445068800
So I'm guessing that sub0 and sub1 are the subdevs playing the long
streams, sub2 playing the short stream and sub3 blocking.
Thank you very much for your time.
Fredrik Tolf
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