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advanced_audio.md

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RG351 M8 Headless Advanced audio

Midi devices and/or external sound cards can be used. In most cases latency will be pretty bad and impact usability. I haven't had very good luck sampling directly into Headless on the RG351 devices, but it might work ok on a Mac or PC. Personally, for the best results, I create samples on the PC or other devices and copy onto the M8 sdcard.

The card index for ALSA and/or PulseAudio depends on order connected to the rg351 device.
For best results, plug in teensy first, then optionally an external sound card, then optionally a midi device.

In ArkOS to access ssh:
Options/Network Info - note the ip address.
Options/Enable remote services
From your PC run: ssh <ip-addr> -l ark

In the ssh terminal run cd roms2/ports/M8

ALSA Commands:
card# depends on order connected to the rg351
For best results, plug in teensy first, then external sound card then midi

aplay -l shows playback devices

arecord -l shows capture devices

Example for aplay and arecord
M8 is connected then external USB Audio device is connected

ark@rg351v:/roms2/ports/M8$ aplay -l

**** List of PLAYBACK Hardware Devices ****
card 0: rockchiprk817co [rockchip,rk817-codec], device 0: ff070000.i2s-rk817-hifi rk817-hifi-0 []
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 1: M8 [M8], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: Device [USB Sound Device], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

ark@rg351v:/roms2/ports/M8$ arecord -l

**** List of CAPTURE Hardware Devices ****
card 0: rockchiprk817co [rockchip,rk817-codec], device 0: ff070000.i2s-rk817-hifi rk817-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: M8 [M8], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: Device [USB Sound Device], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Connect M8 to rockchip out
alsaloop -P hw:0,0 -C hw:1,0 -t 200000 -A 5 --rate 44100 --sync=0 -T -1 -d

You can edit the alsaloop_wait file with the correct alsaloop command

You'll need to use some pulseaudio commands to change the active port on a USB soundcard device (i.e from mic to line in)

PulseAudio

Determine active audio ports on USB audio
If you get errors, you may need to restart pulse before each command.

Input ports

First stop emulationstation
ark@rg351v:/roms2/ports/M8$ sudo systemctl stop emulationstation

ark@rg351v:/roms2/ports/M8$ sudo pulseaudio --start
W: [pulseaudio] main.c: This program is not intended to be run as root (unless --system is specified).


ark@rg351v:/roms2/ports/M8$ sudo pacmd
>>> list-sources
4 source(s) available.
...
      ports:
                analog-input-mic: Microphone (priority 8700, latency offset 0 usec, available: unknown)
                        properties:
                                device.icon_name = "audio-input-microphone"
                analog-input-linein: Line In (priority 8100, latency offset 0 usec, available: unknown)
                        properties:

        active port: <analog-input-linein>
...

to change active input port:
>>> set-source-port <index#> analog-input-linein
or
>>> set-source-port <index#> analog-input-mic

Output Ports
>>>list-sinks
Note the sinks

Exit pacmd
>>> exit

Restart emulationstation
ark@rg351v:/roms2/ports/M8$ sudo systemctl start emulationstation

Edit the pulseaudio_pa file - set the sink and source corresponding to the correct device index from the listings in pacmd