[PROBLEM] Popping sound during playback

[manolomalele]

I'm not able to repro "I cannot see displayed the infos about the file type and bitrate: e.g. DSD 64 1bit." My test DSF file is DSD64 format that's decoded to DoP and played on a Katana DAC.



Post the output from the command below while your file is playing and I'll have a look.

Code:

cat /proc/asound/card1/pcm0p/sub0/hw_params

I used to maintain a table of USB Audio device names but it became too time consuming to update because there are just too many of them and new ones are frequently being released so I reverted to just "USB Audio device". I suppose I could try to parse the name from the output of aplay -l command but IIRC the name is often not a well formed product name and in a fixed location in the output. See examples below for a couple of I2S DAC's.

Code:

card 0: Katana [Allo Katana], device 0: bcm2835-i2s-allo-katana-codec allo-katana-codec.1-0030-0 [bcm2835-i2s-allo-katana-codec allo-katana-codec.1-0030-0]

card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplusadc], device 0: HiFiBerry DAC+ADC HiFi multicodec-0 [HiFiBerry DAC+ADC HiFi multicodec-0]

Code:

Audio Information
INPUT / OUTPUT
Source:     USB/saitama/DSD/Jacintha - Autumn Leaves The Songs of Johnny Mercer/10 - Jacintha - Moon River.dsf
Encoded at:     DSD64, 1 bit, 5.644 Mbps Stereo
Decoded to:     DoP 24 bit 176.4 kHz, Stereo, 8.467 Mbps
Destination:     Local
Output rate:     32 bit, 176.4 kHz, Stereo, 11.290 Mbps
DSP OPERATIONS
Volume ctl:     Software (MPD 32-bit float with dither)
Resampling:     off
Polarity inv:     off
Crossfade:     off
Crossfeed:     off
Parametric EQ:     off
Graphic EQ:     off
Replaygain:     off
Normalize vol:     off
Chip options:     None
AUDIO DEVICE
Device:     USB audio device
Chip:     
Interface:     USB
Formats:     Unable to determine formats
Platform:     Pi-3B+ 1GB v1.3

Hi Tim. 
This is what I've got.

1) playing a DSD

pi@moode:~ $ cat /proc/asound/card1/pcm0p/sub0/hw_params
access: RW_INTERLEAVED
format: S32_LE
subformat: STD
channels: 2
rate: 176400 (176400/1)
period_size: 22050
buffer_size: 88200

   

   


2) Playing a flac

pi@moode:~ $ cat /proc/asound/card1/pcm0p/sub0/hw_params
access: RW_INTERLEAVED
format: S32_LE
subformat: STD
channels: 2
rate: 44100 (44100/1)
period_size: 5513
buffer_size: 22050

   
   


As you can see there'n no bitrate/freq shown

below the aplay -l

pi@moode:~ $ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
  Subdevices: 7/7
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 IEC958/HDMI [bcm2835 IEC958/HDMI]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: ALSA [bcm2835 ALSA], device 2: bcm2835 IEC958/HDMI1 [bcm2835 IEC958/HDMI1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: D50 [D50], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

Last question:
Do you know how to show on the display the filetype aswell?

Thanks