maximtrp / spectrumled

Spectrum analyzer on a LED matrix :sound:

Hello! 👋

Here is a list of my repos:

Repository	Description	GitHub
Science
bitermplus	Biterm topic models (for short texts)
fixation-correction	Fixation Correction plugin for Pupil Labs software
mchmm	Markov chains and hidden Markov models
scikit-na	Missing data analysis
scikit-posthocs	Multiple pairwise comparison tests
tmplot	Visualization of topic modeling results
Web
youtrack-vscode-extension	YouTrack Extension for Visual Studio Code
droneci-vscode-extension	Drone CI Extension for Visual Studio Code
tab	Start page generator
randpaper	Random photo from Pexels
CLI tools
ranger-archives	Ranger plugin for creating and extracting archives
ranger-cmus	Ranger plugin for integration with *cmus audio player
mufi	Simple music finder for command-line
lastfm-cli-scrobbler	Last.fm CLI scrobbler
Arduino
spectrumLED	Spectrum analyzer on a LED matrix
heart-sensor	Heart rate sensor
lastfm-cli-scrobbler	Mood lamp based on arduino and WS2812 RGB leds
Linux WMs
i3blocks-blocklets	Useful blocklets for *i3blocks*
awesome-wm-widgets	Widgets for Awesome WM

spectrumled's Issues

Problem asound.conf

Hi, I have tried to configure the asound.conf and it does not work.
Hardware
(0, 'bcm2835 ALSA: - (hw:0,0)', 0)
(1, 'bcm2835 ALSA: IEC958/HDMI (hw:0,1)', 0)
(2, 'USB Audio DAC: - (hw:1,0)', 0)
(3, 'Loopback: PCM (hw:2,0)', 32)
(4, 'Loopback: PCM (hw:2,1)', 32)
(5, 'sysdefault', 0)
(6, 'default', 0)
(7, 'dmix', 0)

I make the changes in the example asound.conf and I do not have audio.

You can help me.

Thanks

USB DAC and device OUT

Hi @maximtrp.
I am configuring Raspotify + SpectrumLED but I am not detecting the device out.

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
  Subdevices: 8/8
  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
  Subdevice #7: subdevice #7
card 0: Loopback [Loopback], device 1: Loopback PCM [Loopback PCM]
  Subdevices: 8/8
  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
  Subdevice #7: subdevice #7
card 1: VX1 [VX1], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

asound.conf

pcm.!default {
	type plug
	playback.pcm "out"
	capture.pcm "loopin"
}

pcm.out {
    type plug
    slave.pcm {
        type multi
        slaves {
            a { channels 2 pcm "output" }
            b { channels 2 pcm "loopout" }
        }
        bindings {
            0 { slave a channel 0 }
            1 { slave a channel 1 }
            2 { slave b channel 0 }
            3 { slave b channel 1 }
        }
    }
    ttable [
        [ 1 0 1 0 ]   # left  -> a.left,  b.left
        [ 0 1 0 1 ]   # right -> a.right, b.right
    ]
}

pcm.loopout {
    type dmix
	ipc_key 1025
	slave.pcm "hw:0,0,0"
    slave {
        period_time 0
        period_size 1024
        buffer_size 8192
        channels 2
    }
    bindings {
        0 0
        1 1
    }
}

pcm.loopin {
    type plug
	slave.pcm "hw:0,1,0"
}

pcm.output {
	type dmix
	ipc_key 1024
	slave.pcm "hw:1,0"
    slave {
        period_time 0
        period_size 1024
        buffer_size 16384
        channels 2
    }
    bindings {
        0 0
        1 1
    }
}

With librepot I can detect the available devices, but it is not out.

$  librespot --name cubex --backend alsa --device ?

[2020-04-23T20:01:03Z INFO  librespot] librespot (raspotify v0.14.0) 3672214 (2020-01-30). Built on 2020-02-16. Build ID: 7pZDdYUK
[2020-04-23T20:01:03Z INFO  librespot_playback::audio_backend::alsa] Using alsa sink
Listing available alsa outputs
pcm devices:
sysdefault:CARD=VX1
	VX1, USB Audio
	Default Audio Device

front:CARD=VX1,DEV=0
	VX1, USB Audio
	Front speakers

surround21:CARD=VX1,DEV=0
	VX1, USB Audio
	2.1 Surround output to Front and Subwoofer speakers

surround40:CARD=VX1,DEV=0
	VX1, USB Audio
	4.0 Surround output to Front and Rear speakers

surround41:CARD=VX1,DEV=0
	VX1, USB Audio
	4.1 Surround output to Front, Rear and Subwoofer speakers

surround50:CARD=VX1,DEV=0
	VX1, USB Audio
	5.0 Surround output to Front, Center and Rear speakers

surround51:CARD=VX1,DEV=0
	VX1, USB Audio
	5.1 Surround output to Front, Center, Rear and Subwoofer speakers

surround71:CARD=VX1,DEV=0
	VX1, USB Audio
	7.1 Surround output to Front, Center, Side, Rear and Woofer speakers

iec958:CARD=VX1,DEV=0
	VX1, USB Audio
	IEC958 (S/PDIF) Digital Audio Output

dmix:CARD=VX1,DEV=0
	VX1, USB Audio
	Direct sample mixing device

dsnoop:CARD=VX1,DEV=0
	VX1, USB Audio
	Direct sample snooping device

hw:CARD=VX1,DEV=0
	VX1, USB Audio
	Direct hardware device without any conversions

plughw:CARD=VX1,DEV=0
	VX1, USB Audio
	Hardware device with all software conversions

ctl devices:
hwdep devices:

What can be missing in my configuration?

Pulseaudio

Hi,

Thank you for this. If PulseAudio is installed, there's no need to setup a loopback device, as Pulseaudio provides monitor buses for all audio channels.

Just

sudo apt-get install pulseaudio

and

python3 spectrumLED.py

and it should work instantly.

snd-aloop issue

Thanks for sharing this cool project. I'm trying to get it up and running but I have a slightly different setup:

• rpi 3 with raspbian stretch using python 3.5
• usb audio card from ebay
• single max7219

The usb audio card is enabled by editing /usr/share/alsa/alsa.conf, look for these lines:

defaults.ctl.card 0
defaults.pcm.card 0

and change the value to 0.

when I run aplay -l it lists the following:

**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
  Subdevices: 6/7
  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 1: Device [USB Audio Device], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

and:

$ cat /proc/asound/cards
 0 [ALSA           ]: bcm2835_alsa - bcm2835 ALSA
                      bcm2835 ALSA
 1 [Device         ]: USB-Audio - USB Audio Device
                      GeneralPlus USB Audio Device at usb-3f980000.usb-1.2, full speed

adding snd-aloop to /etc/modules and rebooting does not list the loopback device. Only a manual sudo modprobe snd-aloop works but I don't want to run this after every reboot.

Any idea how to fix this?

The idea is to eventually visualize the audio from the usb audio device.