CamillaDSP - Cross-platform IIR and FIR engine for crossovers, room correction etc

taotao · 2025-01-16 6:46 pm

I experience the same drift of lipsync after some minutes. I also use Kodi. In V2 it was stable. In V3 it drifts away the more the longer it runs. Restarting the cdsp service on raspi brings synchronisation back until it again drifts away.
I've got a fixed sample rate in Kodi. My Hat is hifiberry digi IO. No filtering involved.
CDs setting like here:

taotao · 2025-01-16 6:48 pm

Enabling multithreading doesn't prevent this drifts.
Kodi runs on a second device and is connected to CDSP Hifiberry Hat with optical cable, see here:

Out to Pre is HDMI.

QuickDraw McGraw · 2025-01-16 6:48 pm

taotao said:
I experience the same drift of lipsync after some minutes. I also use Kodi. In V2 it was stable.

Interesting. I guess if you try https://github.com/HEnquist/camilladsp/releases/tag/v3.0.0-beta.2 it would be stable again.

Changes from 3b2 to 3.0: https://github.com/HEnquist/camilladsp/compare/v3.0.0-beta.2...v3.0.0

phofman · 2025-01-16 6:54 pm

taotao said:
CDs setting like here:

Honestly, it would be better to post the config file instead of a part of the GUI screen. The screenshot does not show e.g. devices which are important in this case.

taotao · 2025-01-16 7:47 pm

Yes you are right phofman.
Beta fixed the problem. Thanks for the hint McGraw

phofman · 2025-01-16 7:53 pm

@taotao: Then please post the whole config as you are reporting some important issue.

I do not know your actual config, but from the two incomplete image fragments : no resampler when very likely two async soundcards? Target level at half of chunksize? E.g. it's possible the latency increase is somehow due to undetected xruns.

taotao · 2025-01-16 8:18 pm

Here is my config:

YAML:

description: None
devices:
  adjust_period: 2
  capture:
    channels: 2
    device: hw:CARD=sndrpihifiberry,DEV=0
    format: S24LE
    labels: null
    link_mute_control: null
    link_volume_control: null
    stop_on_inactive: null
    type: Alsa
  capture_samplerate: 44100
  chunksize: 2048
  enable_rate_adjust: true
  multithreaded: false
  playback:
    channels: 8
    device: hw:b1,0,0
    format: S24LE3
    type: Alsa
  queuelimit: 24
  rate_measure_interval: 2
  resampler: null
  samplerate: 44100
  silence_threshold: -99
  silence_timeout: 2
  stop_on_rate_change: false
  target_level: 1024
  volume_limit: null
  volume_ramp_time: 20
  worker_threads: null
filters:
  10k:
    description: null
    parameters:
      bandwidth: 1
      freq: 12000
      gain: 2
      type: Peaking
    type: Biquad
  200hz:
    description: null
    parameters:
      bandwidth: 0.5
      freq: 200
      gain: 3.5
      type: Peaking
    type: Biquad
  Bass:
    description: null
    parameters:
      freq: 85
      gain: 0
      q: 0.9
      type: Lowshelf
    type: Biquad
  HP125:
    description: null
    parameters:
      freq: 125
      order: 4
      type: LinkwitzRileyHighpass
    type: BiquadCombo
  LP125:
    description: null
    parameters:
      freq: 125
      order: 8
      type: LinkwitzRileyLowpass
    type: BiquadCombo
  Tilt down:
    description: null
    parameters:
      gain: 0
      type: Tilt
    type: BiquadCombo
  Treble:
    description: null
    parameters:
      freq: 6500
      gain: 0
      q: 0.7
      type: Highshelf
    type: Biquad
  Volume:
    description: null
    parameters:
      fader: Aux1
      limit: null
      ramp_time: 200
    type: Volume
  delay:
    description: null
    parameters:
      delay: 0.33
      subsample: false
      unit: ms
    type: Delay
  gain-3.5:
    description: null
    parameters:
      gain: -3.5
      inverted: false
      mute: false
      scale: dB
    type: Gain
  hp800:
    description: null
    parameters:
      freq: 800
      order: 4
      type: LinkwitzRileyHighpass
    type: BiquadCombo
  lp800:
    description: null
    parameters:
      freq: 800
      order: 4
      type: LinkwitzRileyLowpass
    type: BiquadCombo
mixers:
  2in_8out:
    channels:
      in: 2
      out: 8
    description: null
    labels:
    - null
    mapping:
    - dest: 0
      mute: false
      sources:
      - channel: 0
        gain: 0
        inverted: false
        mute: false
        scale: dB
    - dest: 1
      mute: false
      sources:
      - channel: 1
        gain: 0
        inverted: false
        mute: false
        scale: dB
    - dest: 2
      mute: false
      sources:
      - channel: 0
        gain: 0
        inverted: false
        mute: true
        scale: dB
    - dest: 3
      mute: false
      sources:
      - channel: 1
        gain: 0
        inverted: false
        mute: true
        scale: dB
    - dest: 4
      mute: false
      sources:
      - channel: 0
        gain: 0
        inverted: false
        mute: true
        scale: dB
    - dest: 5
      mute: false
      sources:
      - channel: 1
        gain: 0
        inverted: false
        mute: true
        scale: dB
    - dest: 6
      mute: false
      sources:
      - channel: 0
        gain: 0
        inverted: false
        mute: true
        scale: dB
    - dest: 7
      mute: false
      sources:
      - channel: 1
        gain: 0
        inverted: false
        mute: true
        scale: dB
pipeline:
- bypassed: null
  description: null
  name: 2in_8out
  type: Mixer
- bypassed: null
  channels:
  - 0
  description: null
  names:
  - Volume
  - Treble
  - Bass
  type: Filter
- bypassed: null
  channels:
  - 1
  description: null
  names:
  - Volume
  - Treble
  - Bass
  type: Filter
- bypassed: null
  channels:
  - 2
  description: null
  names: []
  type: Filter
- bypassed: null
  channels:
  - 3
  description: null
  names: []
  type: Filter
- bypassed: null
  channels:
  - 4
  description: null
  names: []
  type: Filter
- bypassed: null
  channels:
  - 5
  description: null
  names: []
  type: Filter
- bypassed: null
  channels:
  - 6
  description: null
  names: []
  type: Filter
- bypassed: null
  channels:
  - 7
  description: null
  names: []
  type: Filter
processors:
  Compressor:
    description: null
    parameters:
      attack: 0.025
      channels: 2
      clip_limit: null
      factor: 5
      makeup_gain: 15
      monitor_channels: []
      process_channels: []
      release: 1
      soft_clip: false
      threshold: -25
    type: Compressor
title: Acoustat One+One

I'll send the trace in some minutes (different PC neccessary for uploading log)

HenrikEnquist · 2025-01-16 8:25 pm

@taotao that config can not give stable latency in any version. The capture and playback devices have independent clocks that are not adjustable, and you don't use the asynchronous resampler. Try enabling the resampler, that really should help. You can also set queue_limit to null, the default of 4 should be fine.

taotao · 2025-01-16 8:25 pm

Here's the trace:

phofman · 2025-01-16 8:27 pm

Also IMO the target level at half of chunk is very prone to xruns which will further ruin the initial latency.

taotao · 2025-01-16 8:27 pm

HenrikEnquist said:
@taotao that config can not give stable latency in any version. The capture and playback devices have independent clocks that are not adjustable, and you don't use the asynchronous resampler. Try enabling the resampler, that really should help. You can also set queue_limit to null, the default of 4 should be fine.

Thank you. I'll give it a try.

taotao · 2025-01-16 8:32 pm

What target level should be more appropiate? Full Chunksize? Or in my case 1536?

Thanks phofman.

taotao · 2025-01-16 8:37 pm

OK, resampling activated (synchronous), queue limit to default and target level in rate adjust to 1536 adjusted.
Runs smooth.
Thanks a lot.

HenrikEnquist · 2025-01-16 8:37 pm

taotao said:
What target level should be more appropiate? Full Chunksize?

Yes that's a good start. Then if you never see buffer underruns and want to try reducing latency, you can try reducing. Or if you have some underruns you can try increasing.

HenrikEnquist · 2025-01-16 8:38 pm

taotao said:
OK, resampling activated (synchronous)

Change it to asynchronous, otherwise it won't help.

QuickDraw McGraw · 2025-01-16 8:38 pm

@HenrikEnquist Hi, do I have a similar problem with config?

Code:

description: Optimized for sitting at the computer keyboard
devices:
  adjust_period: 6
  capture:
    channels: 6
    device: hw:Loopback,1,0
    format: null
    labels:
    - FL
    - FR
    - RL
    - RR
    - FC
    - LFE
    link_mute_control: null
    link_volume_control: null
    stop_on_inactive: null
    type: Alsa
  capture_samplerate: null
  chunksize: 2048
  enable_rate_adjust: true
  multithreaded: null
  playback:
    channels: 6
    device: pipewire
    format: null
    type: Alsa
  queuelimit: 16
  rate_measure_interval: null
  resampler: null
  samplerate: 48000
  silence_threshold: -80
  silence_timeout: 5
  stop_on_rate_change: null
  target_level: 6143
  volume_limit: null
  volume_ramp_time: null
  worker_threads: null
filters:
  cllpgain:
    description: null
    parameters:
      gain: -3.1
      inverted: false
      mute: false
      scale: dB
    type: Gain
  delay_c:
    description: null
    parameters:
      delay: 4.6697
      subsample: false
      unit: ms
    type: Delay
  delay_ds:
    description: null
    parameters:
      delay: 18
      subsample: false
      unit: ms
    type: Delay
  delay_l:
    description: null
    parameters:
      delay: 2.5404
      subsample: false
      unit: ms
    type: Delay
  delay_lfe:
    description: null
    parameters:
      delay: 3.9843
      subsample: false
      unit: ms
    type: Delay
  delay_r:
    description: null
    parameters:
      delay: 0
      subsample: false
      unit: ms
    type: Delay
  delay_rl:
    description: null
    parameters:
      delay: 7.5467
      subsample: false
      unit: ms
    type: Delay
  delay_rr:
    description: null
    parameters:
      delay: 1.5527
      subsample: false
      unit: ms
    type: Delay
  fir_fl:
    description: null
    parameters:
      channel: 0
      filename: ../../../rewfiles/D1/FLg inv-MP_FRg inv-MP-$samplerate$.wav
      type: Wav
    type: Conv
  fir_fr:
    description: null
    parameters:
      channel: 1
      filename: ../../../rewfiles/D1/FLg inv-MP_FRg inv-MP-$samplerate$.wav
      type: Wav
    type: Conv
  fir_lfe:
    description: null
    parameters:
      channel: 0
      filename: ../../../rewfiles/D1/FLEg Inv-MP-$samplerate$.wav
      type: Wav
    type: Conv
  fir_rl:
    description: null
    parameters:
      channel: 0
      filename: ../../../rewfiles/D1/SLg Inv-MP_SRg Inv-MP-$samplerate$.wav
      type: Wav
    type: Conv
  fir_rr:
    description: null
    parameters:
      channel: 1
      filename: ../../../rewfiles/D1/SLg Inv-MP_SRg Inv-MP-$samplerate$.wav
      type: Wav
    type: Conv
  highpass:
    description: null
    parameters:
      freq: 95
      q: 0.707
      type: Highpass
    type: Biquad
  limiter:
    description: null
    parameters:
      clip_limit: -3
      soft_clip: false
    type: Limiter
  loudness:
    description: null
    parameters:
      attenuate_mid: null
      fader: null
      high_boost: 10
      low_boost: 10
      reference_level: -20
    type: Loudness
  lowpass:
    description: null
    parameters:
      freq: 80
      q: 0.707
      type: Lowpass
    type: Biquad
mixers:
  stereo:
    channels:
      in: 6
      out: 6
    labels:
    - FR
    - RR
    - FL
    - RL
    - FC
    - LFE
    mapping:
    - dest: 0
      mute: false
      sources:
      - channel: 1
        gain: 7
        inverted: false
        mute: null
        scale: dB
      - channel: 4
        gain: 7
        inverted: false
        mute: false
        scale: dB
    - dest: 2
      mute: false
      sources:
      - channel: 0
        gain: 0
        inverted: false
        mute: false
        scale: dB
      - channel: 4
        gain: 0
        inverted: false
        mute: false
        scale: dB
    - dest: 5
      mute: false
      sources:
      - channel: 1
        gain: 7
        inverted: false
        mute: null
        scale: dB
      - channel: 0
        gain: 7
        inverted: false
        mute: false
        scale: dB
      - channel: 5
        gain: 10
        inverted: false
        mute: null
        scale: dB
    - dest: 1
      mute: false
      sources:
      - channel: 3
        gain: 12
        inverted: false
        mute: null
        scale: dB
    - dest: 3
      mute: false
      sources:
      - channel: 2
        gain: 9
        inverted: false
        mute: null
        scale: dB
pipeline:
- bypassed: false
  description: null
  name: stereo
  type: Mixer
- bypassed: null
  channels:
  - 0
  description: null
  names:
  - delay_l
  - fir_fl
  - loudness
  - cllpgain
  type: Filter
- bypassed: null
  channels:
  - 2
  description: null
  names:
  - delay_rl
  - fir_rl
  - loudness
  - cllpgain
  type: Filter
- bypassed: null
  channels:
  - 1
  description: null
  names:
  - delay_r
  - fir_fr
  - cllpgain
  type: Filter
- bypassed: null
  channels:
  - 3
  description: null
  names:
  - delay_rr
  - fir_rr
  - cllpgain
  type: Filter
- bypassed: null
  channels:
  - 5
  description: null
  names:
  - delay_lfe
  - fir_lfe
  - loudness
  - cllpgain
  type: Filter
processors: null
title: ATK

HenrikEnquist · 2025-01-16 8:40 pm

@QuickDraw McGraw no you are capturing from the loopback, which has an adjustable clock. No need for any async resampler. I would suggest reducing target_level to 2048 to see what happens.

phofman · 2025-01-16 8:41 pm

HenrikEnquist said:
Then if you never see buffer underruns and want to try reducing latency, you can try reducing.

Another method could be reducing the chunksize while keeping the target level at one chunk at least. IMHO it's what alsa maintainers would recommend - more of smaller periods.

taotao · 2025-01-16 8:42 pm

HenrikEnquist said:
Change it to asynchronous, otherwise it won't help.

OK 🙂

phofman · 2025-01-16 8:47 pm

phofman said:
Another method could be reducing the chunksize while keeping the target level at one chunk at least. IMHO it's what alsa maintainers would recommend - more of smaller periods.

One of the arguments can be that many drivers update the delay (or avail) only at period boundaries. The shorter the periods, the more precise the delay/avail information is.

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CamillaDSP - Cross-platform IIR and FIR engine for crossovers, room correction etc

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