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    HISE FX and delay compensation

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    • Dan KorneffD
      Dan Korneff
      last edited by Dan Korneff

      I could use some suggestions on how to improve my approach to handling latency in my projects. I've currently been manually measuring latency and compensating for it based on which DSP nodes and oversampling are active. While this works well for static latency, I’m running into a challenge when I need to dynamically update the latency.
      Right now, I’m using:
      prepareToPlay() to get the initial latency with Engine.getLatencySamples()
      processBlock() to set latency using setLatencySamples()
      This works well for static latencies, but now that I’m introducing multiple oversampling filters, I need to adjust latency dynamically, depending on whether the user selects Linear-Phase or Minimum-Phase filtering. Since Linear-Phase filtering can add up to ~120 samples, I don’t want to set a fixed latency that high, as it would negatively impact real-time usage.
      I need a way to recalculate latency when the processing mode changes. For example, when switching between oversampling filters. The goal is to update latency based on active DSP modules.
      @Christoph-Hart or anyone else have suggestions on how to dynamically recalculate the latency?

      Dan Korneff - Producer / Mixer / Audio Nerd

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      • A
        aaronventure @Dan Korneff
        last edited by

        @Dan-Korneff can you measure the latency of your modules, put it in consts and make the call to set the new latency to report whenever the user changes any of the controls that affect it?

        Christoph HartC Dan KorneffD 2 Replies Last reply Reply Quote 0
        • Christoph HartC
          Christoph Hart @aaronventure
          last edited by

          I would not trust every host to support dynamic latency so I‘d definitely check this thoroughly.

          1 Reply Last reply Reply Quote 1
          • Dan KorneffD
            Dan Korneff @aaronventure
            last edited by

            @aaronventure said in HISE FX and delay compensation:

            @Dan-Korneff can you measure the latency of your modules, put it in consts and make the call to set the new latency to report whenever the user changes any of the controls that affect it?

            That's definitely plan B. I guess I need to use a global variable to get this data into scriptFX?

            Dan Korneff - Producer / Mixer / Audio Nerd

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            • A
              aaronventure @Dan Korneff
              last edited by

              @Dan-Korneff why do you need to get it into script fx in the first place?

              Dan KorneffD 1 Reply Last reply Reply Quote 0
              • Dan KorneffD
                Dan Korneff @aaronventure
                last edited by

                @aaronventure scriptFX is the only place you can access the processBlock to call Engine.setLatencySamples()

                Dan Korneff - Producer / Mixer / Audio Nerd

                Christoph HartC A 2 Replies Last reply Reply Quote 0
                • Christoph HartC
                  Christoph Hart @Dan Korneff
                  last edited by Christoph Hart

                  @Dan-Korneff Why do you need to access processBlock?

                  If you need the sample rate / block size for the calculation, attach a broadcaster to the processing specs.

                  Dan KorneffD 1 Reply Last reply Reply Quote 0
                  • A
                    aaronventure @Dan Korneff
                    last edited by

                    @Dan-Korneff I'm calling it from a control callback where sample offset is adjusted and it works just fine (in Reaper).

                    Dan KorneffD 1 Reply Last reply Reply Quote 0
                    • Dan KorneffD
                      Dan Korneff @Christoph Hart
                      last edited by

                      @Christoph-Hart I was just following your Latency Test repo

                      Screenshot 2025-01-31 082335.png

                      Dan Korneff - Producer / Mixer / Audio Nerd

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                      • Dan KorneffD
                        Dan Korneff @aaronventure
                        last edited by

                        @aaronventure Damn... Just tested and it works like you said. Happy days!

                        Dan Korneff - Producer / Mixer / Audio Nerd

                        Christoph HartC 1 Reply Last reply Reply Quote 0
                        • Christoph HartC
                          Christoph Hart @Dan Korneff
                          last edited by

                          @Dan-Korneff ah the example might precede the broadcaster addition, so that‘s kind of outdated as a best practice but if it works…

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