add module bsp.DownSampler

6 years ago · 21cea40da4
--- a/plugins/community/repos/bsp/README.md
+++ b/plugins/community/repos/bsp/README.md
@@ -18,6 +18,20 @@ Suggested applications:



 # DownSampler

 Records audio into a ringbuffer (~10 seconds) and plays it back at a lower sample rate (/1../8).

 The trigger input resets the record and play heads.

 NOTE: this used to be a sampler trick that was especially popular in 90ies dub techno music (e.g. downsampled chord stabs).

 NOTE: the module makes absolutely no attempt to hide / filter out the aliased frequencies. feel free to pre-process the input with a steep lowpass filter.

 NOTE: here's an example video: https://vimeo.com/288968750



 # Obxd_VCF

 An adaption of Filatov Vadim's excellent Ob-Xd filter. Distributed under terms of the GNU General Public License V3.
--- a/plugins/community/repos/bsp/make.objects
+++ b/plugins/community/repos/bsp/make.objects
@@ -1,5 +1,6 @@
 ALL_OBJ= \
 	src/AttenuMixer.o \
 	src/DownSampler.o \
 	src/bsp.o \
 	src/Obxd_VCF.o \
 	src/RMS.o \
--- a/plugins/community/repos/bsp/res/DownSampler.svg
+++ b/plugins/community/repos/bsp/res/DownSampler.svg
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--- a/plugins/community/repos/bsp/src/DownSampler.cpp
+++ b/plugins/community/repos/bsp/src/DownSampler.cpp
@@ -0,0 +1,166 @@
 /*
 Copyright (c) 2018 bsp

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in all
 copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 */

 #include <math.h>
 #include "dsp/digital.hpp"

 #include "bsp.hpp"

 namespace rack_plugin_bsp {

 struct DownSampler : Module {
 	enum ParamIds {
 		RATE_PARAM,
 		NUM_PARAMS
 	};
 	enum InputIds {
      AUDIO_INPUT,
      TRIG_INPUT,
      RATE_MOD_INPUT,
 		NUM_INPUTS
 	};
 	enum OutputIds {
 		AUDIO_OUTPUT,
 		NUM_OUTPUTS
 	};

   static const uint32_t BUFFER_SIZE = (512*1024u);  //  ~11.8sec @ 44.1kHz
   static const uint32_t BUFFER_SIZE_MASK = (BUFFER_SIZE - 1u);

   float *buf;
   uint32_t buf_write_idx;
   int32_t rate_read_left;
   uint32_t buf_read_idx;
 	SchmittTrigger trigger;
   float sample_rate;

 	DownSampler() : Module(NUM_PARAMS, NUM_INPUTS, NUM_OUTPUTS) {
      buf_read_idx = ~0u;
      rate_read_left = 0;
      buf_write_idx = 0u;
      buf = new float[BUFFER_SIZE];
      handleSampleRateChanged();
   }
   
   ~DownSampler() {
      delete [] buf;
      buf = NULL;
   }

   void handleSampleRateChanged(void) {
      sample_rate = engineGetSampleRate();
   }

   void onSampleRateChange() override {
      Module::onSampleRateChange();

      handleSampleRateChanged();
   }

 	void step() override;
 };


 void DownSampler::step() {

 	if(trigger.process(inputs[TRIG_INPUT].value))
   {
      // printf("xxx DownSampler: trig\n");
      buf_read_idx = ~0u;
      buf_write_idx = 0u;
      rate_read_left = 0;
   }

   // Append new input to ring buffer
   float inVal = inputs[AUDIO_INPUT].value;
   buf[buf_write_idx] = inVal;
   buf_write_idx = (buf_write_idx + 1u) & BUFFER_SIZE_MASK;

   if(--rate_read_left < 0)
   {
      buf_read_idx = (buf_read_idx + 1u) & BUFFER_SIZE_MASK;

      float rateF = params[RATE_PARAM].value;

      if(inputs[RATE_MOD_INPUT].active)
      {
         rateF += inputs[RATE_MOD_INPUT].value * (7.0f / 5.0f);
      }

      rate_read_left = int32_t(rateF);
   }

   float outVal = buf[buf_read_idx];

   outputs[AUDIO_OUTPUT].value = outVal;

 #if 0
   static int xxx = 0;
   if(0 == (++xxx & 32767))
   {
      printf("xxx readIdx=%u writeIdx=%u readLeft=%d\n", buf_read_idx, buf_write_idx, rate_read_left);
   }
 #endif
 }


 struct DownSamplerWidget : ModuleWidget {
 	DownSamplerWidget(DownSampler *module);
 };

 DownSamplerWidget::DownSamplerWidget(DownSampler *module) : ModuleWidget(module) {
 	setPanel(SVG::load(assetPlugin(plugin, "res/DownSampler.svg")));

 	addChild(Widget::create<ScrewSilver>(Vec(15, 0)));
 	addChild(Widget::create<ScrewSilver>(Vec(15, 365)));

   float cx;
   float cy;

 #define STY 60.0f
   cx = 12.0f;
   cy = 66.0f;
 	addInput(Port::create<PJ301MPort>(Vec(11.0f, cy), Port::INPUT, module, DownSampler::AUDIO_INPUT));
   cy += STY;
 	addInput(Port::create<PJ301MPort>(Vec(11.0f, cy), Port::INPUT, module, DownSampler::TRIG_INPUT));
 #undef STY

 #define STY 32.0f
   cx = 12.0f;
   cy = 200.0f;
 	addParam(ParamWidget::create<RoundSmallBlackKnob>(Vec(cx, cy), module, DownSampler::RATE_PARAM, 0.0f, 7.0f, 1.0f));
   cy += STY;
 	addInput(Port::create<PJ301MPort>(Vec(11.0f, cy), Port::INPUT, module, DownSampler::RATE_MOD_INPUT));
 #undef STX
 #undef STY

 	addOutput(Port::create<PJ301MPort>(Vec(11, 325), Port::OUTPUT, module, DownSampler::AUDIO_OUTPUT));
 }

 } // namespace rack_plugin_bsp

 using namespace rack_plugin_bsp;

 RACK_PLUGIN_MODEL_INIT(bsp, DownSampler) {
   Model *modelDownSampler = Model::create<DownSampler, DownSamplerWidget>("bsp", "DownSampler", "DownSampler", SAMPLER_TAG);
   return modelDownSampler;
 }
--- a/plugins/community/repos/bsp/src/bsp.cpp
+++ b/plugins/community/repos/bsp/src/bsp.cpp
@@ -1,6 +1,7 @@
 #include "bsp.hpp"

 RACK_PLUGIN_MODEL_DECLARE(bsp, AttenuMixer);
 RACK_PLUGIN_MODEL_DECLARE(bsp, DownSampler);
 RACK_PLUGIN_MODEL_DECLARE(bsp, Obxd_VCF);
 RACK_PLUGIN_MODEL_DECLARE(bsp, RMS);
 RACK_PLUGIN_MODEL_DECLARE(bsp, Scanner);
@@ -13,6 +14,7 @@ RACK_PLUGIN_INIT(bsp) {
   RACK_PLUGIN_INIT_WEBSITE("https://github.com/bsp2/VeeSeeVSTRack/tree/v0.6/plugins/community/repos/bsp");

   RACK_PLUGIN_MODEL_ADD(bsp, AttenuMixer);
   RACK_PLUGIN_MODEL_ADD(bsp, DownSampler);
   RACK_PLUGIN_MODEL_ADD(bsp, Obxd_VCF);
   RACK_PLUGIN_MODEL_ADD(bsp, RMS);
   RACK_PLUGIN_MODEL_ADD(bsp, Scanner);
--- a/vst2_bin/plugins/bsp/README.md
+++ b/vst2_bin/plugins/bsp/README.md
@@ -18,6 +18,20 @@ Suggested applications:



 # DownSampler

 Records audio into a ringbuffer (~10 seconds) and plays it back at a lower sample rate (/1../8).

 The trigger input resets the record and play heads.

 NOTE: this used to be a sampler trick that was especially popular in 90ies dub techno music (e.g. downsampled chord stabs).

 NOTE: the module makes absolutely no attempt to hide / filter out the aliased frequencies. feel free to pre-process the input with a steep lowpass filter.

 NOTE: here's an example video: https://vimeo.com/288968750



 # Obxd_VCF

 An adaption of Filatov Vadim's excellent Ob-Xd filter. Distributed under terms of the GNU General Public License V3.
--- a/vst2_bin/plugins/bsp/res/DownSampler.svg
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