some streaming (radio) sources generates distorted sound on armv6hf about squeezelite HOT 13 CLOSED

also the softfloat version show these symptoms...

Can you post the output of starting with "-d output=debug" added to the command 
line?

[20:58:10.013683] output_init:932 init output
[20:58:10.015371] output_init:935 outputbuf size: 3528000
[20:58:10.056916] output_init:954 output: front:CARD=CODEC,DEV=0 maxrate: 48000
[20:58:10.057689] output_init:966 unable to set output sched fifo: Operation 
not permitted
[20:58:10.067826] output_thread:326 open output device: front:CARD=CODEC,DEV=0
[20:58:10.072777] alsa_open:221 opened device front:CARD=CODEC,DEV=0 using 
format: S16_LE sample rate: 44100
[20:58:10.073320] alsa_open:265 buffer time: 20045 period count: 4 buffer size: 
884 period size: 221
[20:58:16.591905] output_thread:490 track start sample rate: 48000 replay_gain: 
0
[20:58:16.592203] output_thread:326 open output device: front:CARD=CODEC,DEV=0
[20:58:16.607738] alsa_open:221 opened device front:CARD=CODEC,DEV=0 using 
format: S16_LE sample rate: 48000
[20:58:16.608199] alsa_open:265 buffer time: 20000 period count: 4 buffer size: 
960 period size: 240

previous comment was from me and noone else...

does 44100 work on this setting - the problem is only with 48000 sample rates?

what happens if you use -o plughw:CARD=CODEC

[20:58:10.013683] output_init:932 init output
[20:58:10.015371] output_init:935 outputbuf size: 3528000
[20:58:10.056916] output_init:954 output: front:CARD=CODEC,DEV=0 maxrate: 48000
[20:58:10.057689] output_init:966 unable to set output sched fifo: Operation 
not permitted
[20:58:10.067826] output_thread:326 open output device: front:CARD=CODEC,DEV=0
[20:58:10.072777] alsa_open:221 opened device front:CARD=CODEC,DEV=0 using 
format: S16_LE sample rate: 44100
[20:58:10.073320] alsa_open:265 buffer time: 20045 period count: 4 buffer size: 
884 period size: 221
[20:58:16.591905] output_thread:490 track start sample rate: 48000 replay_gain: 
0
[20:58:16.592203] output_thread:326 open output device: front:CARD=CODEC,DEV=0
[20:58:16.607738] alsa_open:221 opened device front:CARD=CODEC,DEV=0 using 
format: S16_LE sample rate: 48000
[20:58:16.608199] alsa_open:265 buffer time: 20000 period count: 4 buffer size: 
960 period size: 240
[21:24:22.849863] output_init:932 init output
[21:24:22.851649] output_init:935 outputbuf size: 3528000
[21:24:22.893660] output_init:954 output: front:CARD=CODEC,DEV=0 maxrate: 48000
[21:24:22.894386] output_init:966 unable to set output sched fifo: Operation 
not permitted
[21:24:22.897820] output_thread:326 open output device: front:CARD=CODEC,DEV=0
[21:24:22.904759] alsa_open:221 opened device front:CARD=CODEC,DEV=0 using forma
t: S16_LE sample rate: 44100
[21:24:22.905349] alsa_open:265 buffer time: 20045 period count: 4 buffer size: 
884 period size: 221
[21:36:20.511430] output_init:932 init output
[21:36:20.513025] output_init:935 outputbuf size: 3528000
[21:36:20.530157] output_init:954 output: plughw:CARD=CODEC maxrate: 192000
[21:36:20.530808] output_init:966 unable to set output sched fifo: Operation not
 permitted
[21:36:20.537775] output_thread:326 open output device: plughw:CARD=CODEC
[21:36:20.545850] alsa_open:221 opened device plughw:CARD=CODEC using format: S3
2_LE sample rate: 44100
[21:36:20.552045] alsa_open:265 buffer time: 20045 period count: 4 buffer size: 
884 period size: 221
[21:36:31.678050] output_thread:490 track start sample rate: 48000 replay_gain: 
0
[21:36:31.678363] output_thread:326 open output device: plughw:CARD=CODEC
[21:36:31.684931] alsa_open:221 opened device plughw:CARD=CODEC using format: 
S32_LE sample rate: 48000
[21:36:31.687254] alsa_open:265 buffer time: 20000 period count: 4 buffer size: 
960 period size: 240
[21:37:11.172729] output_thread:490 track start sample rate: 48000 replay_gain: 
0
[21:38:13.033843] output_init:932 init output
[21:38:13.035629] output_init:935 outputbuf size: 3528000
[21:38:13.051593] output_init:954 output: plughw:CARD=CODEC maxrate: 192000
[21:38:13.052301] output_init:966 unable to set output sched fifo: Operation 
not permitted
[21:38:13.057783] output_thread:326 open output device: plughw:CARD=CODEC
[21:38:13.067392] alsa_open:221 opened device plughw:CARD=CODEC using format: 
S32_LE sample rate: 44100
[21:38:13.072627] alsa_open:265 buffer time: 20045 period count: 4 buffer size: 
884 period size: 221
[21:38:23.593683] output_thread:490 track start sample rate: 48000 replay_gain: 
0
[21:38:23.594000] output_thread:326 open output device: plughw:CARD=CODEC
[21:38:23.600917] alsa_open:221 opened device plughw:CARD=CODEC using format: 
S32_LE sample rate: 48000
[21:38:23.603058] alsa_open:265 buffer time: 20000 period count: 4 buffer size: 
960 period size: 240


...... still distorted signal

i am truly sorry for disturbing the christmas celebrations (if you celebrate 
that of course...)

Hum - does the dac work with squeezelite on the other machine ok using 
hw:CARD=CODEC?  

Does it work ok on the default pi output device?  I wonder if this is related 
to the pi usb problems - 48000 needs higher data rate than 44100 but not by 
much.  Can you playback other 48000 material on the pi ok?

As a workaround you could compile your own squeezelite which forces the max 
sample rate to 44100 which would cause the server to resample.  Happy to 
provide more details if this is something you want to try...

ok i think that you definitely is onto something here. I have not had the time 
to move the DAC to the other machine yet (i'll do that when i have the time), 
but:

Playing the material through the default output device of the pi yields good 
audio also at 48000. I have been trying to read through the available material 
on the USB problems of the pi. Is it this one you are referring to ? 
https://github.com/raspberrypi/firmware/issues/19

thanks for caring despite this being a busy time of the year

Yes you have linked to the pi issues - it doesn't work at any frequency without 
breakup with my dac - a usb async 1.1 device.  Some people have success setting 
the usb port to usb full speed only.  I think you will find the config 
somewhere on here: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=23544

Can you confirm if this issue is still a problem.  There are still well know 
issues with Pi and many usb dacs, but some work ok.  I want to make sure we 
separate these issues from squeezelite issues.

Some dacs have been reported as working using the new -a ::16: option to force 
16 bit output from squeezelite.

have not tried that yet, but the problem persists with the latest and greatest 
version. Setting dwc_otg.speed=1 in /boot/cmdline does however do the trick for 
me, yielding good sound, i will investigate the "-a ::16:" variant as well.

If changing the usb bus speed resolves, then this is a Pi/usb issue and not an 
issue with squeezelite.  Some people have seen the -a ::16: option improve this 
- I believe it is due to reducing the bandwidth required as its using 16 not 24 
bits.

However will close this issue as it doesn't sound to be with squeezelite 
itself.  Please reopen or open a new one if you still see it is with 
squeezelite.