[FEATURE] Define input and output level calibration functionality for…

… `DSP` (#121)

* Start up some  basic testing

* Implement input & output level functionality

* Add main test runner to workflow

.github/workflows/build.yml

@@ -26,5 +26,6 @@ jobs:
     - name: Run tests
       working-directory: ${{github.workspace}}
       run: |
+        ./build/tools/run_tests
         ./build/tools/benchmodel ./example_models/wavenet.nam
         ./build/tools/benchmodel ./example_models/lstm.nam

NAM/dsp.h

@@ -58,11 +58,21 @@ class DSP
   // Expected sample rate, in Hz.
   // TODO throw if it doesn't know.
   double GetExpectedSampleRate() const { return mExpectedSampleRate; };
+  // Input Level, in dBu, corresponding to 0 dBFS for a sine wave
+  // You should call HasInputLevel() first to be safe.
+  double GetInputLevel() {return mInputLevel.level;};
   // Get how loud this model is, in dB.
   // Throws a std::runtime_error if the model doesn't know how loud it is.
   double GetLoudness() const;
+  // Output Level, in dBu, corresponding to 0 dBFS for a sine wave
+  // You should call HasOutputLevel() first to be safe.
+  double GetOutputLevel() {return mOutputLevel.level;};
+  // Does this model know its output level?
+  bool HasInputLevel() {return mInputLevel.haveLevel;};
   // Get whether the model knows how loud it is.
   bool HasLoudness() const { return mHasLoudness; };
+  // Does this model know its output level?
+  bool HasOutputLevel() {return mOutputLevel.haveLevel;};
   // General function for resetting the DSP unit.
   // This doesn't call prewarm(). If you want to do that, then you might want to use ResetAndPrewarm().
   // See https://github.com/sdatkinson/NeuralAmpModelerCore/issues/96 for the reasoning.
@@ -73,10 +83,12 @@ class DSP
     Reset(sampleRate, maxBufferSize);
     prewarm();
   }
+  void SetInputLevel(const double inputLevel) {mInputLevel.haveLevel = true; mInputLevel.level = inputLevel;};
   // Set the loudness, in dB.
   // This is usually defined to be the loudness to a standardized input. The trainer has its own, but you can always
   // use this to define it a different way if you like yours better.
   void SetLoudness(const double loudness);
+  void SetOutputLevel(const double outputLevel) {mOutputLevel.haveLevel = true; mOutputLevel.level = outputLevel;};
 
 protected:
   bool mHasLoudness = false;
@@ -92,6 +104,14 @@ class DSP
 
   // How many samples should be processed for me to be considered "warmed up"?
   virtual int PrewarmSamples() { return 0; };
+
+private:
+  struct Level {
+    bool haveLevel=false;
+    float level = 0.0;
+  };
+  Level mInputLevel;
+  Level mOutputLevel;
 };
 
 // Class where an input buffer is kept so that long-time effects can be

tools/CMakeLists.txt

@@ -11,6 +11,7 @@ include_directories(tools ${NAM_DEPS_PATH}/nlohmann)
 
 add_executable(loadmodel loadmodel.cpp ${NAM_SOURCES})
 add_executable(benchmodel benchmodel.cpp ${NAM_SOURCES})
+add_executable(run_tests run_tests.cpp ${NAM_SOURCES})
 
 source_group(NAM ${CMAKE_CURRENT_SOURCE_DIR} FILES ${NAM_SOURCES})
 

tools/run_tests.cpp

@@ -0,0 +1,19 @@
+// Entry point for tests
+
+#include <iostream>
+#include "test/test_dsp.cpp"
+
+int main() {
+    std::cout << "Running tests..." << std::endl;
+    // TODO Automatically loop, catch exceptions, log results
+    test_dsp::test_construct();
+    test_dsp::test_get_input_level();
+    test_dsp::test_get_output_level();
+    test_dsp::test_has_input_level();
+    test_dsp::test_has_output_level();
+    test_dsp::test_set_input_level();
+    test_dsp::test_set_output_level();
+
+    std::cout << "Success!" << std::endl;
+    return 0;
+}

tools/test/test_dsp.cpp

@@ -0,0 +1,59 @@
+// Tests for dsp
+
+#include "NAM/dsp.h"
+
+namespace test_dsp {
+    // Simplest test: can I construct something!
+    void test_construct() {
+        nam::DSP myDsp(48000.0);
+    }
+
+    void test_get_input_level() {
+        nam::DSP myDsp(48000.0);
+        const double expected = 19.3;
+        myDsp.SetInputLevel(expected);
+        assert(myDsp.HasInputLevel());
+        const double actual = myDsp.GetInputLevel();
+
+        assert(actual == expected);
+    }
+
+    void test_get_output_level() {
+        nam::DSP myDsp(48000.0);
+        const double expected = 12.3;
+        myDsp.SetOutputLevel(expected);
+        assert(myDsp.HasOutputLevel());
+        const double actual = myDsp.GetOutputLevel();
+
+        assert(actual == expected);
+    }
+
+    // Test correct function of DSP::HasInputLevel()
+    void test_has_input_level() {
+        nam::DSP myDsp(48000.0);
+        assert(!myDsp.HasInputLevel());
+
+        myDsp.SetInputLevel(19.3);
+        assert(myDsp.HasInputLevel());
+    }
+
+    void test_has_output_level() {
+        nam::DSP myDsp(48000.0);
+        assert(!myDsp.HasOutputLevel());
+
+        myDsp.SetOutputLevel(12.3);
+        assert(myDsp.HasOutputLevel());
+    }
+
+    // Test correct function of DSP::HasInputLevel()
+    void test_set_input_level() {
+        nam::DSP myDsp(48000.0);
+        myDsp.SetInputLevel(19.3);
+    }
+
+    void test_set_output_level() {
+        nam::DSP myDsp(48000.0);
+        myDsp.SetOutputLevel(19.3);
+    }
+};
+