1 files changed, 112 insertions, 0 deletions
diff --git a/src/audio/testlimiter.cpp b/src/audio/testlimiter.cpp
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+++ b/src/audio/testlimiter.cpp
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+//
+//  libavg - Media Playback Engine.
+//  Copyright (C) 2003-2014 Ulrich von Zadow
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2 of the License, or (at your option) any later version.
+//
+//  This library is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+//  Lesser General Public License for more details.
+//
+//  You should have received a copy of the GNU Lesser General Public
+//  License along with this library; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+//  Current versions can be found at www.libavg.de
+//
+
+#include "Dynamics.h"
+
+#include "../base/TestSuite.h"
+#include "../base/MathHelper.h"
+
+#include <stdlib.h>
+#include <iostream>
+
+using namespace avg;
+using namespace std;
+
+class LimiterTest: public Test {
+public:
+    LimiterTest()
+        : Test("LimiterTest", 2)
+    {
+    }
+
+    void runTests()
+    {
+        const int CHANNELS = 2;
+        float fs = 44100.f;
+        int numSamples = int(fs * 0.1f);
+
+        // Setup a brickwall limiter
+        typedef Dynamics<float, CHANNELS> TStereoLimiter;
+        TStereoLimiter* d = new TStereoLimiter(fs);
+        d->setThreshold(0.f); // in dB
+        d->setAttackTime(0.f); // in seconds
+        d->setReleaseTime(0.05f); // in seconds
+        d->setRmsTime(0.f); // in seconds
+        d->setRatio(std::numeric_limits<float>::infinity());
+        d->setMakeupGain(0.f); // in dB
+
+        // Generate input and output test data
+        float* pSamples = new float[CHANNELS*numSamples];
+        for (int j = 0; j < numSamples; j++) {
+            for (int i = 0; i < CHANNELS; i++) {
+                pSamples[j*CHANNELS+i] = 2*sin(j*(440.f/44100)*float(M_PI));
+            }
+        }
+
+        // Let the limiter work.
+        for (int i=0; i<numSamples; ++i) {
+            d->process(pSamples+i*CHANNELS);
+        }
+
+        // Check if everything is ok.
+        bool bDiscontinuities = false;
+        bool bAboveThreshold = false;
+        for (int j = 1; j < numSamples; j++) {
+            for (int i = 0; i < CHANNELS; i++) {
+                // Test if anything is above the threshold.
+                if (pSamples[j*CHANNELS+i] > 1) {
+                    bAboveThreshold = true;
+                }
+                if (fabs(pSamples[j*CHANNELS+i]-pSamples[(j-1)*CHANNELS+i]) > 0.05f) {
+                    bDiscontinuities = true;
+//                    cerr << j << ": " << outSamples[j*OUT_CHANNELS+i] << ", " << 
+//                            outSamples[(j-1)*OUT_CHANNELS+i] << endl;
+                }
+            }
+        }
+        TEST(!bAboveThreshold);
+        TEST(!bDiscontinuities);
+/*
+        // Save data to ascii file.
+        FILE * pFile = fopen("data.txt", "w");
+        for (int j = 0; j < numSamples; j++) {
+            fprintf(pFile, "%f\n", pSamples[j*OUT_CHANNELS]);
+        }
+        fclose(pFile);
+*/
+        // Free memory
+        delete d;
+        delete[] pSamples;
+    }
+};
+
+int main(int nargs, char** args)
+{
+    LimiterTest test;
+    test.runTests();
+    bool bOK = test.isOk();
+
+    if (bOK) {
+        return 0;
+    } else {
+        return 1;
+    }
+}