refactor: Move chunkware to third_party

third_party/chunkware_dsp/SimpleLimit.cpp

@@ -0,0 +1,102 @@
+/*
+ *  Simple Limiter (source)
+ *
+ *  File        : SimpleLimit.cpp
+ *  Library     : SimpleSource
+ *  Version     : 1.12
+ *  Implements  : SimpleLimit
+ *
+ *  2006, ChunkWare Music Software, OPEN-SOURCE
+ *
+ *  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 "SimpleLimit.h"
+
+namespace chunkware_simple
+{
+    //-------------------------------------------------------------
+    SimpleLimit::SimpleLimit()
+        : threshdB_(0.0)
+        , thresh_(1.0)
+        , peakHold_(0)
+        , peakTimer_(0)
+        , maxPeak_(1.0)
+        , att_(1.0)
+        , rel_(10.0)
+        , env_(1.0)
+        , mask_(BUFFER_SIZE - 1)
+        , cur_(0)
+    {
+        setAttackImpl(1.0);
+        outBuffer_[ 0 ].resize(BUFFER_SIZE, 0.0);
+        outBuffer_[ 1 ].resize(BUFFER_SIZE, 0.0);
+    }
+
+    //-------------------------------------------------------------
+    void SimpleLimit::setThresh(double dB)
+    {
+        threshdB_ = dB;
+        thresh_ = dB2lin(dB);
+    }
+
+    //-------------------------------------------------------------
+    void SimpleLimit::setAttackImpl(double ms)
+    {
+        unsigned int samp = static_cast<unsigned>(0.001 * ms * att_.getSampleRate());
+
+        assert(samp < BUFFER_SIZE);
+
+        peakHold_ = samp;
+        att_.setTc(ms);
+    }
+
+    //-------------------------------------------------------------
+    void SimpleLimit::setRelease(double ms)
+    {
+        rel_.setTc(ms);
+    }
+
+    //-------------------------------------------------------------
+    void SimpleLimit::setSampleRate(double sampleRate)
+    {
+        att_.setSampleRate(sampleRate);
+        rel_.setSampleRate(sampleRate);
+    }
+
+    //-------------------------------------------------------------
+    void SimpleLimit::initRuntime(void)
+    {
+        peakTimer_ = 0;
+        maxPeak_ = thresh_;
+        env_ = thresh_;
+        cur_ = 0;
+        outBuffer_[ 0 ].assign(BUFFER_SIZE, 0.0);
+        outBuffer_[ 1 ].assign(BUFFER_SIZE, 0.0);
+    }
+
+    //-------------------------------------------------------------
+    void SimpleLimit::FastEnvelope::setCoef(void)
+    {
+        // rises to 99% of in value over duration of time constant
+        coef_ = pow(0.01, (1000.0 / (ms_ * sampleRate_)));
+    }
+
+}   // end namespace chunkware_simple