Re: [Alsa-user] Aplay Underruns
On 10/18/2016 11:52 PM, Clemens Ladisch wrote: > Jay Foster wrote: >> Looks like aplay is using libspeex (builtin) for conversion. How can >> I select linear as you suggested? > Add the following line to /etc/asound.conf: > > defaults.pcm.rate_converter "linear" > > > Regards, > Clemens > Thanks. That seems to have been helpful. No xrun errors. Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 22050 Hz, Mono Plug PCM: Rate conversion PCM (44100, sformat=S16_LE) Converter: linear-interpolation Protocol version: 10002 Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat: STD channels : 1 rate : 22050 exact rate : 22050 (22050/1) msbits : 16 buffer_size : 11025 period_size : 2756 period_time : 125011 tstamp_mode : NONE tstamp_type : MONOTONIC period_step : 1 avail_min: 2756 period_event : 0 start_threshold : 11025 stop_threshold : 11025 silence_threshold: 0 silence_size : 0 boundary : 722534400 Slave: Route conversion PCM (sformat=S16_LE) Transformation table: 0 <- 0 1 <- 0 Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S16_LE subformat: STD channels : 1 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 22052 period_size : 5513 period_time : 125011 tstamp_mode : NONE tstamp_type : MONOTONIC period_step : 1 avail_min: 5513 period_event : 0 start_threshold : 22052 stop_threshold : 22052 silence_threshold: 0 silence_size : 0 boundary : 1445199872 Slave: Hardware PCM card 0 'USB Audio Device' device 0 subdevice 0 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 : 22052 period_size : 5513 period_time : 125011 tstamp_mode : NONE tstamp_type : MONOTONIC period_step : 1 avail_min: 5513 period_event : 0 start_threshold : 22052 stop_threshold : 22052 silence_threshold: 0 silence_size : 0 boundary : 1445199872 appl_ptr : 0 hw_ptr : 0 -- Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Aplay Underruns
Jay Foster wrote: > Looks like aplay is using libspeex (builtin) for conversion. How can > I select linear as you suggested? Add the following line to /etc/asound.conf: defaults.pcm.rate_converter "linear" Regards, Clemens -- Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Aplay Underruns
On 10/18/2016 12:04 AM, Clemens Ladisch wrote:
> Jay Foster wrote:
>> On 10/16/2016 11:47 PM, Clemens Ladisch wrote:
>>> Jay Foster wrote:
The sound comes out in short bursts with pauses in between. Each pause
is accompanied with an underrun error
[...]
This makes me think the problem I am having is with the pcm plugin that
does the resampling.
>>> Apparently, it uses too much of your CPU (whatever it is). [...]
>> 'aplay -D plughw:0 test.wav" did not make any difference.
>> [...]
>> would I have any better luck telling aplay to select the 44100 Hz output
>> rate and resample 220500 to 44100 instead?
> The exact target rate does not matter for CPU usage, and it's probably
> using 44100 already.
>
> Which resampling algorithm are you using? ("aplay -v -D plughw:0 test.wav")
> (The fastest one would be "linear".)
>
>> 400MHz armv5te
> This CPU might be too weak to do real-time resampling without special
> assembler optimizations.
>
>
> Regards,
> Clemens
>
The output from 'aplay -v -D plughw:0 test.wav'
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 22050 Hz, Mono
Plug PCM: Rate conversion PCM (44100, sformat=S16_LE)
Converter: libspeex (builtin)
Protocol version: 10002
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S16_LE
subformat: STD
channels : 1
rate : 22050
exact rate : 22050 (22050/1)
msbits : 16
buffer_size : 11025
period_size : 2756
period_time : 125011
tstamp_mode : NONE
tstamp_type : MONOTONIC
period_step : 1
avail_min: 2756
period_event : 0
start_threshold : 11025
stop_threshold : 11025
silence_threshold: 0
silence_size : 0
boundary : 722534400
Slave: Route conversion PCM (sformat=S16_LE)
Transformation table:
0 <- 0
1 <- 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat: STD
channels : 1
rate : 44100
exact rate : 44100 (44100/1)
msbits : 16
buffer_size : 22052
period_size : 5513
period_time : 125011
tstamp_mode : NONE
tstamp_type : MONOTONIC
period_step : 1
avail_min: 5513
period_event : 0
start_threshold : 22052
stop_threshold : 22052
silence_threshold: 0
silence_size : 0
boundary : 1445199872
Slave: Hardware PCM card 0 'USB Audio Device' device 0 subdevice 0
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 : 22052
period_size : 5513
period_time : 125011
tstamp_mode : NONE
tstamp_type : MONOTONIC
period_step : 1
avail_min: 5513
period_event : 0
start_threshold : 22052
stop_threshold : 22052
silence_threshold: 0
silence_size : 0
boundary : 1445199872
appl_ptr : 0
hw_ptr : 0
underrun!!! (at least 562.873 ms long)
Status:
state : XRUN
trigger_time: 66491.687393162
tstamp : 66492.250212039
delay : -20
avail : 11045
avail_max : 11045
underrun!!! (at least 566.130 ms long)
Status:
state : XRUN
trigger_time: 66494.2985491
tstamp : 66494.569089846
delay : 2734
avail : 8291
avail_max : 11045
underrun!!! (at least 551.742 ms long)
Status:
state : XRUN
trigger_time: 66496.265264033
tstamp : 66496.816978168
delay : -20
avail : 11045
avail_max : 11045
underrun!!! (at least 518.706 ms long)
Status:
state : XRUN
trigger_time: 66498.535974737
tstamp : 66499.54651071
delay : 2734
avail : 8291
avail_max : 11045
underrun!!! (at least 512.702 ms long)
Status:
state : XRUN
trigger_time: 66500.843756142
tstamp : 66501.356430555
delay : -20
avail : 11045
avail_max : 11045
Looks like aplay is using libspeex (builtin) for conversion. How can I
select linear as you suggested?
Jay
--
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Re: [Alsa-user] Aplay Underruns
On 10/16/2016 11:47 PM, Clemens Ladisch wrote: > Jay Foster wrote: >> I am using aplay version 1.1.2 on an arm based system, but cannot get it >> to play audio properly. The sound card is a C-Media USB Audio Device. >> >> The sound comes out in short bursts with pauses in between. Each pause >> is accompanied with an underrun error >> [...] >> This makes me think the problem I am having is with the pcm plugin that >> does the resampling. > Apparently, it uses too much of your CPU (whatever it is). > >> Is there a way to fix this?. Can I avoid the resampling somehow by >> configuring the sound device for 22050 Hz? > Try without dmix: "aplay -D plughw:0 test.wav". > > > Regards, > Clemens > Thanks. 'aplay -D plughw:0 test.wav" did not make any difference. This is on a 400MHz armv5te processor. cat /proc/asound/card0/stream0 shows the following for the sound card: Playback: Status: Stop Interface 1 Altset 1 Format: S16_LE Channels: 2 Endpoint: 1 OUT (ADAPTIVE) Rates: 48000, 44100 Capture: Status: Stop Interface 2 Altset 1 Format: S16_LE Channels: 1 Endpoint: 2 IN (SYNC) Rates: 48000, 44100 In my naivety, would I have any better luck telling aplay to select the 44100 Hz output rate and resample 220500 to 44100 instead? How would I even do that? Jay -- Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
Re: [Alsa-user] Aplay Underruns
Jay Foster wrote: > I am using aplay version 1.1.2 on an arm based system, but cannot get it > to play audio properly. The sound card is a C-Media USB Audio Device. > > The sound comes out in short bursts with pauses in between. Each pause > is accompanied with an underrun error > [...] > This makes me think the problem I am having is with the pcm plugin that > does the resampling. Apparently, it uses too much of your CPU (whatever it is). > Is there a way to fix this?. Can I avoid the resampling somehow by > configuring the sound device for 22050 Hz? Try without dmix: "aplay -D plughw:0 test.wav". Regards, Clemens -- Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
[Alsa-user] Aplay Underruns
I am using aplay version 1.1.2 on an arm based system, but cannot get it to play audio properly. The sound card is a C-Media USB Audio Device. The sound comes out in short bursts with pauses in between. Each pause is accompanied with an underrun error like so: aplay test.wav Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 22050 Hz, Mono underrun!!! (at least 481.117 ms long) underrun!!! (at least 505.789 ms long) underrun!!! (at least 453.072 ms long) underrun!!! (at least 475.359 ms long) underrun!!! (at least 425.028 ms long) underrun!!! (at least 447.205 ms long) If I add the '--disable-resample' option, then the pauses and errors go away, but it does sound sped up. Aplay reports Warning: rate is not accurate (requested = 22050Hz, got = 48000Hz) So I used the sox application to pre convert my test.wav file from 20500 Hz to 48000 Hz and used aplay to play that. This played with no pauses, errors or warnings. The resampling quality from sox was not that good. This makes me think the problem I am having is with the pcm plugin that does the resampling. Is there a way to fix this?. Can I avoid the resampling somehow by configuring the sound device for 22050 Hz? Jay -- Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot ___ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
