Corrupt Audio input. With loopback cable, low system load, & high max distortion lvl.

[Eric.Zaluzec]

Hello! Using 64bit cmd line bit linux on my embedded system, I am getting an error with sound, saying 'Corrupt Audio input'. I've reviewed pdf guide, the forums, and the web before posting here. I was wondering if I could get some help debugging.

1) I've set the system loads to 1 and set a max distortion level to 20. This did not change any results.


2) The pdf guide says the Sound Test generates an 8 bit sound format. My aplay sound test, says only 16&32 LE formats are supported. Could this be a problem?
root:~# aplay -D default Untitled3.wav
Playing WAVE 'Untitled3.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo

3) Loopback Cable:
https://www.newegg.com/Product/Produ...A&gclsrc=aw.ds

4)
******************
DETAILED EVENT LOG
******************
LOG NOTE: 2017-05-08 19:08:41, Status, Completed started test run
LOG NOTE: 2017-05-08 19:08:41, Disk: Startup Disk [/dev/root], Each file size is: 36444 blocks of 16384 bytes (569 MB, 597098496 Bytes)
SERIOUS: 2017-05-08 19:08:47, Sound, Corrupt Audio input
LOG NOTE: 2017-05-08 19:08:47, Sound, No audio signal for 990f sample. Try reducing system load.
LOG NOTE: 2017-05-08 19:08:55, Status, Test run stopped

5)
========================= SOUND_INFO =========================
Mon May 8 19:08:41 2017 - 381334 APLAY
null
Discard all samples (playback) or generate zero samples (capture)
pulse
PulseAudio Sound Server
sysdefault:CARD=PCH
HDA Intel PCH, ALC887-VD Analog
Default Audio Device
front:CARD=PCH,DEV=0
HDA Intel PCH, ALC887-VD Analog
Front speakers
surround21:CARD=PCH,DEV=0
HDA Intel PCH, ALC887-VD Analog
2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=PCH,DEV=0
HDA Intel PCH, ALC887-VD Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=PCH,DEV=0
HDA Intel PCH, ALC887-VD Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=PCH,DEV=0
HDA Intel PCH, ALC887-VD Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=PCH,DEV=0
HDA Intel PCH, ALC887-VD Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PCH,DEV=0
HDA Intel PCH, ALC887-VD Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=PCH,DEV=0
HDA Intel PCH, ALC887-VD Digital
IEC958 (S/PDIF) Digital Audio Output
hdmi:CARD=PCH,DEV=0
HDA Intel PCH, HDMI 0
HDMI Audio Output
hdmi:CARD=PCH,DEV=1
HDA Intel PCH, HDMI 1
HDMI Audio Output
hdmi:CARD=PCH,DEV=2
HDA Intel PCH, HDMI 2
HDMI Audio Output
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC887-VD Analog [ALC887-VD Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: ALC887-VD Digital [ALC887-VD Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
Mon May 8 19:08:41 2017 - 410378 /proc/asound/version
Advanced Linux Sound Architecture Driver Version k4.4.26-yocto-standard.
Mon May 8 19:08:41 2017 - 416168 LSPCI audio
Mon May 8 19:08:41 2017 - 422147 LSMOD snd
snd_hda_codec_hdmi 37630 1
snd_hda_codec_realtek 57347 1
snd_hda_codec_generic 54850 1 snd_hda_codec_realtek
snd_hda_intel 22577 0
snd_hda_codec 80756 4 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_c odec_generic,snd_hda_intel
snd_hda_core 38763 5 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_c odec_generic,snd_hda_codec,snd_hda_intel
Mon May 8 19:08:41 2017 - 428555 ========================== SOUND_INFO_END ==========================


Any input, feedback, or questions would be appreciated.
Cheers,
-Eric Zaluzec

[Eric.Zaluzec]

As a quick update, I did a dump on my hardware parameters and it looks like the the hardware only supports signed 16 & 32 bit LE audio formats.

The burnintest tries to run an 8 bit sound format and this must be my problem.

Is there any way to pass in a configuration option to run a 16 bit sound format when using bit_cmd_line_x64?

[Eric.Zaluzec]

This issue can be marked as resolved.
1) To resolve the 'Corrupt Audio Input', the embedded linux system needed the following packages & kernel modules to support sound loopback & 8bit audio formats:
libasound, alsa-conf, alsa-conf-base, alsa-lib, alsa-utils-alsaloop, & kernel-module-snd-aloop.

2) Once the 'Corrupt Audio Input' was resolved, a new issue occurred saying:
CWave::StartInput: about to read
CWave::StartInput: Read error: -11 Resource temporarily unavailable
CWave::StartInput: called snd_pcm_prepare: -16 Device or resource busy

To resolve 'Resource temporarily unavailable', the 'plughw' sound alias called in config_cmd.txt was changed to 'default' and the .asoundrc file was used to modify the 'default' alias, to share the capture/playback using dsnoop/dmix PCM's on the loopback card created by kernel module snd-aloop and alsaloop.

.asoundrc file:

pcm.dmixer {
  type dmix
  ipc_key 1024
  ipc_key_add_uid true
  ipc_perm 0666
  slave {
    pcm "hw:1,1,0"
    period_time 0
    period_size 1024
    buffer_size 8192
    rate 44100
  }

  bindings {
    0 0
    1 1
  }
}

pcm.dsnooper {
  type dsnoop
  ipc_key 1024
  ipc_key_add_uid true
  ipc_perm 0666
  slave {
    pcm "hw:1,0,0"
    period_time 0
    period_size 1024
    buffer_size 8192
    rate 44100
  }

  bindings {
    0 0
    1 1
  }
}

pcm.asymed {
  type asym
  playback.pcm "dmixer"
  capture.pcm "dsnooper"
}

pcm.dsp0 {
  type plug
  slave.pcm "asymed"
}

pcm.!default {
  type plug
  slave.pcm "asymed"
}

pcm.default {
  type plug
  slave.pcm "asymed"
}

ctl.mixer0 {
  type hw
  card 1
}

[Tim (PassMark)]

We tried to email you a test build but sounds like you didn't receive it.

Glad to hear it is working on your system now and thanks for posting the follow up.