Alpha

src/DbDezipper.cpp

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+/*
+ *   Copyright (c) 2022 Robin E. R. Davies
+ *   All rights reserved.
+
+ *   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 "DbDezipper.hpp"
+
+using namespace pipedal;
+
+static const int SEGMENT_SIZE = 64;
+
+void DbDezipper::SetSampleRate(double sampleRate)
+{
+    this->sampleRate = sampleRate;
+    this->dbPerSegment = 96/rate * SEGMENT_SIZE / sampleRate;
+}
+
+void DbDezipper::SetRate(float seconds)
+{
+    this->rate = seconds;
+    this->dbPerSegment = 96/rate * SEGMENT_SIZE / sampleRate;
+    
+}
+
+
+void DbDezipper::SetMinDb(float minDb)
+{
+    this->minDb = minDb;
+    if (targetDb < minDb)
+    {
+        targetDb = minDb;
+        count = 0;
+    }
+    if (currentDb < minDb)
+    {
+        currentDb = minDb;
+        x = targetX = 0;
+        dx = 0;
+        count = 0;
+    }
+}
+
+void DbDezipper::NextSegment()
+{
+    if (targetDb == currentDb)
+    {
+        x = targetX;
+        dx = 0;
+        if (targetDb <= minDb)
+        {
+            x = 0;
+        }
+        count = -1;
+        return;
+    }
+    else if (targetDb < currentDb)
+    {
+        currentDb -= dbPerSegment;
+        if (currentDb < targetDb)
+        {
+            currentDb = targetDb;
+        }
+    }
+    else
+    {
+        currentDb += dbPerSegment;
+        if (currentDb > targetDb)
+        {
+            currentDb = targetDb;
+        }
+    }
+    this->targetX = db2a(currentDb);
+    this->dx = (targetX - x) / SEGMENT_SIZE;
+    this->count = SEGMENT_SIZE;
+}
+
+void DbDezipper::Reset(float db)
+{
+    float value;
+    if (db <= minDb)
+    {
+        value = 0;
+    } else {
+        value = db2a(db);
+    }
+    x = targetX = value;
+    dx = 0;
+    currentDb = db;
+    targetDb = db;
+    count = -1;
+}