All looks good, but can't stream sound

[LazyCloner]

Hello there,

I was able to install everything well, the client launch correctly, I can connect it to my car and I have Attached iPod Device on my car screen. But when I tried to run a sound test I have :

pi@raspberrypi:~ $ speaker-test -D plughw:CARD=iPodUSB,DEV=0 -c 2 -r 44100
...
Playback device is plughw:CARD=iPodUSB,DEV=0
...
Write error: -5,Input/output error
xrun_recovery failed: -5,Input/output error
Transfer failed: Input/output error

I'm working on a raspi zero W (raspian 5.4.51).
And the sound card show up with aplay -l .
The trace file only have the 2 following lines :

< 08 00 55 0E 00 13 00 00 04 11 00 00 00 02 00 00 02 00 C6 00 00
> 01 00 55 04 00 02 00 13 E7 00 00 00 00

And thank you for your code oandrew !

[oandrew]

Hi, @LazyCloner

Current master (https://github.com/oandrew/ipod) might fix the issue for you.
Audio should be working once you see type=audio.TrackNewAudioAttributes message in the log

[LazyCloner]

Hi, thank you for your help !

It seem like it works better now but after type=audio.TrackNewAudioAttributes the audio device is still closed.

pi@raspi:~ $ sudo speaker-test -D plughw:CARD=iPodUSB,DEV....
...
Write error: -5, Input/output error
pi@raspi:~ $ cat /proc/asound/iPodUSB/pcm0p/sub0/status
closed

But the communication doesn't stuck anymore after GetDevAuthentificationInfo.

I'll upload the trace in 1h. (And I'll try to set the PlayState to 1)

PS : I tried with kernel 4.19 and golang versions 1.13 and 1.15

EDIT : I tried to set PlayState to 1 but it didn't do the trick.
Here is the trace file ipod.trace

[oandrew]

@LazyCloner Try current master when you have a chance

[LazyCloner]

Hi @oandrew !
Thank you for your time.
But unfortunately nothing changed. The audio device is still closed and the trace file is exactly same as the previous one.

Have a good day !

[oandrew]

@LazyCloner hmm..
trace file can't be the same because I fixed a bug in the most recent commit.

oandrew/ipod@05257f6

[LazyCloner]

Ok, I'll double check if I clone it well

[LazyCloner]

So with the current master, I can now open the sound device but I could only ear like a white noise sound. And the program seem to be in a loop. There is the trace file. ipod.trace

In second, on my car screen, it's writen "PAUSED"
Is the trace file look like normal ?

[oandrew]

@LazyCloner This is great! White noise is what you are supposed to hear - https://linux.die.net/man/1/speaker-test. It means everything is working.

[LazyCloner]

Oh nice ! Thank you so much Andrew !
I will do 2 more try before closing the issue.
Thanks for your time, Is there a place to give some little donation ?

[pavelkrotkov]

Similar problem here - install went well, but no sound coming out in the speaker test.
Compiled using go 1.15 on the latest RPi OS with kernel 5.4.72+.
ipod trace prints this error message inline, full file attached.

ERRO[0411.607895] << CMD error=ipod.Command unmarshal: unknown cmd 0x00,0x0d id=0x00,0x0d trx= type=ipod.UnknownPayload

ipod.trace.txt