- clean working copy for leaving SVN

2022-06-28 19:04:46 +02:00
parent 62a2d47cb3
commit 762b8f0e7d
1966 changed files with 699872 additions and 126 deletions
@@ -0,0 +1,142 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library - "Jules' Utility Class Extensions"
+   Copyright 2004-11 by Raw Material Software Ltd.
+
+  ------------------------------------------------------------------------------
+
+   JUCE can be redistributed and/or modified under the terms of the GNU General
+   Public License (Version 2), as published by the Free Software Foundation.
+   A copy of the license is included in the JUCE distribution, or can be found
+   online at www.gnu.org/licenses.
+
+   JUCE 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 General Public License for more details.
+
+  ------------------------------------------------------------------------------
+
+   To release a closed-source product which uses JUCE, commercial licenses are
+   available: visit www.rawmaterialsoftware.com/juce for more information.
+
+  ==============================================================================
+*/
+
+#ifndef __AUDIOLIVESCROLLINGDISPLAY_H_4C3BD3A7__
+#define __AUDIOLIVESCROLLINGDISPLAY_H_4C3BD3A7__
+
+#include "../JuceDemoHeader.h"
+
+
+//==============================================================================
+/* This component scrolls a continuous waveform showing the audio that's
+   coming into whatever audio inputs this object is connected to.
+*/
+class LiveScrollingAudioDisplay  : public Component,
+                                   public AudioIODeviceCallback,
+                                   private Timer
+{
+public:
+    LiveScrollingAudioDisplay()
+        : nextSample (0), subSample (0), accumulator (0)
+    {
+        setOpaque (true);
+        clear();
+
+        startTimerHz (75); // use a timer to keep repainting this component
+    }
+
+    //==============================================================================
+    void audioDeviceAboutToStart (AudioIODevice*) override
+    {
+        clear();
+    }
+
+    void audioDeviceStopped() override
+    {
+        clear();
+    }
+
+    void audioDeviceIOCallback (const float** inputChannelData, int numInputChannels,
+                                float** outputChannelData, int numOutputChannels,
+                                int numSamples) override
+    {
+        for (int i = 0; i < numSamples; ++i)
+        {
+            float inputSample = 0;
+
+            for (int chan = 0; chan < numInputChannels; ++chan)
+                if (inputChannelData[chan] != nullptr)
+                    inputSample += std::abs (inputChannelData[chan][i]);  // find the sum of all the channels
+
+            pushSample (10.0f * inputSample); // boost the level to make it more easily visible.
+        }
+
+        // We need to clear the output buffers before returning, in case they're full of junk..
+        for (int j = 0; j < numOutputChannels; ++j)
+            if (outputChannelData[j] != nullptr)
+                zeromem (outputChannelData[j], sizeof (float) * (size_t) numSamples);
+    }
+
+private:
+    float samples[1024];
+    int nextSample, subSample;
+    float accumulator;
+
+    void clear()
+    {
+        zeromem (samples, sizeof (samples));
+        accumulator = 0;
+        subSample = 0;
+    }
+
+    void paint (Graphics& g) override
+    {
+        g.fillAll (Colours::black);
+
+        const float midY = getHeight() * 0.5f;
+        int samplesAgo = (nextSample + numElementsInArray (samples) - 1);
+
+        RectangleList<float> waveform;
+        waveform.ensureStorageAllocated ((int) numElementsInArray (samples));
+
+        for (int x = jmin (getWidth(), (int) numElementsInArray (samples)); --x >= 0;)
+        {
+            const float sampleSize = midY * samples [samplesAgo-- % numElementsInArray (samples)];
+            waveform.addWithoutMerging (Rectangle<float> ((float) x, midY - sampleSize, 1.0f, sampleSize * 2.0f));
+        }
+
+        g.setColour (Colours::lightgreen);
+        g.fillRectList (waveform);
+    }
+
+    void timerCallback() override
+    {
+        repaint();
+    }
+
+    void pushSample (const float newSample)
+    {
+        accumulator += newSample;
+
+        if (subSample == 0)
+        {
+            const int inputSamplesPerPixel = 200;
+
+            samples[nextSample] = accumulator / inputSamplesPerPixel;
+            nextSample = (nextSample + 1) % numElementsInArray (samples);
+            subSample = inputSamplesPerPixel;
+            accumulator = 0;
+        }
+        else
+        {
+            --subSample;
+        }
+    }
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (LiveScrollingAudioDisplay);
+};
+
+
+#endif  // __AUDIOLIVESCROLLINGDISPLAY_H_4C3BD3A7__