Microphone is not recording audio data

Autonomous Machines Jetson & Embedded Systems Jetson TK1
1

Please see below error, before that it was working. I have used apple headphones to record using jack connector.
But currently it shows me an error:

arecord -t wav -c 1 -d 6 -v /home/ubuntu/reco69.wav -D sysdefault:CARD=1
Recording WAVE ‘/home/ubuntu/reco69.wav’ : Unsigned 8 bit, Rate 8000 Hz, Mono
arecord: set_params:1297: Unable to install hw params:
ACCESS: RW_INTERLEAVED
FORMAT: U8
SUBFORMAT: STD
SAMPLE_BITS: 8
FRAME_BITS: 8
CHANNELS: 1
RATE: 8000
PERIOD_TIME: 125000
PERIOD_SIZE: 1000
PERIOD_BYTES: 1000
PERIODS: 4
BUFFER_TIME: 500000
BUFFER_SIZE: 4000
BUFFER_BYTES: 4000
TICK_TIME: 0

{it shows me:
arecord: set_params:1297: Unable to install hw params:}

2

Hello!

What board and L4T release are you using?

The above command works fine for me on Jetson TX2 …

$ arecord -t wav -c 1 -d 6 -v /home/ubuntu/reco69.wav -D sysdefault:CARD=1
Recording WAVE '/home/ubuntu/reco69.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono
Plug PCM: Linear conversion PCM (S8)
Its setup is:
  stream       : CAPTURE
  access       : RW_INTERLEAVED
  format       : U8
  subformat    : STD
  channels     : 1
  rate         : 8000
  exact rate   : 8000 (8000/1)
  msbits       : 8
  buffer_size  : 4000
  period_size  : 1000
  period_time  : 125000
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 1000
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 4000
  silence_threshold: 0
  silence_size : 0
  boundary     : 9007199254740992000
Slave: Hardware PCM card 1 'tegra-snd-t186ref-mobile-rt565x' device 0 subdevice 0
Its setup is:
  stream       : CAPTURE
  access       : MMAP_INTERLEAVED
  format       : S8
  subformat    : STD
  channels     : 1
  rate         : 8000
  exact rate   : 8000 (8000/1)
  msbits       : 8
  buffer_size  : 4000
  period_size  : 1000
  period_time  : 125000
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 1000
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 4000
  silence_threshold: 0
  silence_size : 0
  boundary     : 9007199254740992000
  appl_ptr     : 0
  hw_ptr       : 0

Can you also share the output from …

cat /proc/asound/cards

And …

arecord -L

Regards,
Jon

3

Hi,

I have same problem on tx2.

card 2: UAC20 [nanoSHARC micArray16 UAC2.0], device 0: USB AUDIO [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0

2 [UAC20 ]: USB-Audio - nanoSHARC micArray16 UAC2.0
XMOS nanoSHARC micArray16 UAC2.0 at usn-3530000.xhci-2.2, high speed

can you help me?

4

Hello!

What command are you using to capture audio?

Is there any error messages that you are seeing?

Regards,
Jon

5

Thank you for reply

my command was

arecord -t wav test.wav -D hw:2,0 -r 48000 -c 16 -f S32_LE -d 5

and error message was

arecord: set_params:1297: Unable to install hw params

also, I used ALSO library

similar error was occured

when this function ‘snd_pcm_hw_params_set_access’ was called.

thanks