Re: [fluid-dev] Distorted Sound with FluidSynth + Alsa on a SBC

[Etienne Besançon]

Thanks for reactivity,

 

Pulse audio is now uninstalled.

 

I was able to get sound from Alsa:

 

odroid@odroid:~$ aplay -l

**** List of PLAYBACK Hardware Devices ****

card 0: ODROIDHDMI [ODROID-HDMI], device 0: SPDIF PCM dit-hifi-0 []

  Subdevices: 1/1

  Subdevice #0: subdevice #0

card 1: ODROIDDAC [ODROID-DAC], device 0: PCM5102 HiFi pcm5102-0 []

  Subdevices: 1/1

  Subdevice #0: subdevice #0

 

odroid@odroid:~$ aplay -D hw:CARD=ODROIDDAC,DEV=0 Desktop/foo.wav 

Playing WAVE 'Desktop/foo.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo

^CAborted by signal Interrupt...

 

Fluidsynth gets right rate:

 

odroid@odroid:~$ fluidsynth -C0 -R0 -r 44100 -c2 -v -d -a alsa -m alsa_seq /home/odroid/Documents/bandoneon_v2.sf2

 

Changing the rate has an expected impact: even distorted, switching from 48000 to 96000 will increase the notes of one octave.

I also try to change the soundfont without improvement.

 

Indeed, the CPU is a 32-bits Cortex-A5…

 

HLB

 

 

 

 

> Message du 15/11/19 10:26
> De : "Philippe Simons" <address@hidden>
> A : "FluidSynth mailing list" <address@hidden>
> Copie à : "Etienne Besançon" <address@hidden>
> Objet : Re: [fluid-dev] Distorted Sound with FluidSynth + Alsa on a SBC
>
>

device seems to be powerful enough.

maybe you can also try to disable 64bit floating point operations and use 32bit with cmake enable-floats options

also if you are not using pulse at all, try to disable it completely

>

Philippe

>

On Fri, Nov 15, 2019 at 9:34 AM Marcus Weseloh <address@hidden> wrote:
>

Hi Etienne,

>

first please try to find out if Fluidsynth is actually the problem or if there is something wrong with your audio setup. Maybe try to play a normal wav file via the alsa device:

>

$ aplay -D hw:1,0 /path/to/a/soundfile.wav

>

For the sound file, use one in the format that you want fluidsynth to output. So if you want it to render 16bit 441000 audio, then try to play a stereo wav with 16 bit and 41000 sample rate. 

See if simply playing the wav file also results in distorted audio.

>

Cheers

Marcus

>

>

Am Do., 14. Nov. 2019 um 22:17 Uhr schrieb Etienne Besançon <address@hidden>:
>

> Hi!

>  

> I'm running FluidSynth on a Single Board Computer, a Hardkernel Odroid C1+ that is actually stacked with a audio board integrating a high-end DAC. The aim is to turn this into a MIDI expander. Long story short, that actually runs pretty good on my desktop computer but got a very distorted sound on the SBC.

>  

> The MIDI instrument is well discovered:

>     odroid@odroid:~$ lsusb 

>     Bus 001 Device 005: ID 2341:8037 Arduino SA 

>  

> Fluidsynth is configured as follow:

>     odroid@odroid:~$ fluidsynth -C0 -R0 -r 44100 -v -d -a alsa -o audio.alsa.device=hw:1 -o synth.polyphony=64 -m alsa_seq /home/odroid/Documents/Bandoneon.sf2 

>     FluidSynth version 1.1.6

>     Copyright (C) 2000-2012 Peter Hanappe and others.

>     Distributed under the LGPL license.

>     SoundFont(R) is a registered trademark of E-mu Systems, Inc.

>     

>     fluidsynth: warning: Failed to pin the sample data to RAM; swapping is possible.

>     fluidsynth: prog 0 0 0

>     fluidsynth: prog 1 0 0

>     fluidsynth: prog 2 0 0

>     fluidsynth: prog 3 0 0

>     fluidsynth: prog 4 0 0

>     fluidsynth: prog 5 0 0

>     fluidsynth: prog 6 0 0

>     fluidsynth: prog 7 0 0

>     fluidsynth: prog 8 0 0

>     fluidsynth: prog 9 128 0

>     fluidsynth: warning: No preset found on channel 9 [bank=128 prog=0]

>     fluidsynth: prog 10 0 0

>     fluidsynth: prog 11 0 0

>     fluidsynth: prog 12 0 0

>     fluidsynth: prog 13 0 0

>     fluidsynth: prog 14 0 0

>     fluidsynth: prog 15 0 0

>     Type 'help' for help topics.

>     

>     event_pre_noteon 0 60 106

>     event_post_noteon 0 60 106

>     fluidsynth: noteon 0 60 106 00000 36.312 3.550 0.000 0

>     event_pre_noteoff 0 60 106

>     event_post_noteoff 0 60 106

>     fluidsynth: noteoff 0 60 0 00000 3.574 1

>     event_pre_noteon 0 60 106

>     event_post_noteon 0 60 106

>     fluidsynth: noteon 0 60 106 00001 39.626 3.876 0.000 0

>     event_pre_noteoff 0 60 106

>     ^C

>  

> The instrument well connected:

>     odroid@odroid:~$ aconnect -io

>     client 0: 'System' [type=kernel]

>         0 'Timer           '

>         1 'Announce        '

>     client 24: 'Arduino Micro' [type=kernel]

>         0 'Arduino Micro MIDI 1'

>     client 128: 'FLUID Synth (3113)' [type=user]

>         0 'Synth input port (3113:0)'

>     odroid@odroid:~$ aconnect 24 128

>  

> Well, everything looks fine but the sound I get when playing the midi instrument is very distorted, noisy. Changing the rate did not improved, playing with the buffer a little bit. Weirdly enough, switching output to pulse audio ("fluidsynth -a pulseaudio...") gives expected sounds but with a 2~3 seconds latency.

>  

> Any clue about this? How can I get more details regarding what going on?

>  

> Thanks!

> HLB

>  

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