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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