New class: LagrangeInterpolator

extras/JuceDemo/Builds/MacOSX/Juce Demo.xcodeproj/project.pbxproj

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extras/JuceDemo/Builds/VisualStudio2005/Juce Demo.vcproj

@@ -312,6 +312,17 @@
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           <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_IIRFilter.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_LagrangeInterpolator.cpp">
+            <FileConfiguration Name="Debug|Win32"
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extras/JuceDemo/Builds/VisualStudio2008/Juce Demo.vcproj

@@ -312,6 +312,17 @@
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+          <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_LagrangeInterpolator.cpp">
+            <FileConfiguration Name="Debug|Win32"
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+              <Tool Name="VCCLCompilerTool"/>
+            </FileConfiguration>
+            <FileConfiguration Name="Release|Win32"
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extras/JuceDemo/Builds/VisualStudio2010/Juce Demo.vcxproj

@@ -173,6 +173,9 @@
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extras/JuceDemo/Builds/VisualStudio2010/Juce Demo.vcxproj.filters

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       <Filter>Juce Modules\juce_audio_basics\effects</Filter>
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extras/JuceDemo/Builds/iOS/Juce Demo.xcodeproj/project.pbxproj

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+		D52F4E0C637B4685217CBEB4 = { isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = "juce_Decibels.h"; path = "../../../../modules/juce_audio_basics/effects/juce_Decibels.h"; sourceTree = "SOURCE_ROOT"; };
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@@ -754,26 +766,17 @@
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@@ -781,7 +784,6 @@
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@@ -924,6 +926,8 @@
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 				08B84C3F669F5BB5BC0A727F,
 				E1FF06E3C31536006051AEA9,
+				9787B210CB870B096AF24A6A,
+				05F4EC3408F31D59EF961555,
 				84B5049006C7616BFC05912C ); name = effects; sourceTree = "<group>"; };
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extras/audio plugin host/Builds/VisualStudio2005/Plugin Host.vcproj

@@ -235,6 +235,17 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_IIRFilter.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_LagrangeInterpolator.cpp">
+            <FileConfiguration Name="Debug|Win32"
+                               ExcludedFromBuild="true">
+              <Tool Name="VCCLCompilerTool"/>
+            </FileConfiguration>
+            <FileConfiguration Name="Release|Win32"
+                               ExcludedFromBuild="true">
+              <Tool Name="VCCLCompilerTool"/>
+            </FileConfiguration>
+          </File>
+          <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_LagrangeInterpolator.h"/>
           <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_Reverb.h"/>
         </Filter>
         <Filter Name="sources">

extras/audio plugin host/Builds/VisualStudio2008/Plugin Host.vcproj

@@ -235,6 +235,17 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_IIRFilter.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_LagrangeInterpolator.cpp">
+            <FileConfiguration Name="Debug|Win32"
+                               ExcludedFromBuild="true">
+              <Tool Name="VCCLCompilerTool"/>
+            </FileConfiguration>
+            <FileConfiguration Name="Release|Win32"
+                               ExcludedFromBuild="true">
+              <Tool Name="VCCLCompilerTool"/>
+            </FileConfiguration>
+          </File>
+          <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_LagrangeInterpolator.h"/>
           <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_Reverb.h"/>
         </Filter>
         <Filter Name="sources">

extras/static library/Builds/VisualStudio2008/juce.vcproj

@@ -197,6 +197,17 @@
             </FileConfiguration>
           </File>
           <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_IIRFilter.h"/>
+          <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_LagrangeInterpolator.cpp">
+            <FileConfiguration Name="Debug|Win32"
+                               ExcludedFromBuild="true">
+              <Tool Name="VCCLCompilerTool"/>
+            </FileConfiguration>
+            <FileConfiguration Name="Release|Win32"
+                               ExcludedFromBuild="true">
+              <Tool Name="VCCLCompilerTool"/>
+            </FileConfiguration>
+          </File>
+          <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_LagrangeInterpolator.h"/>
           <File RelativePath="..\..\..\..\modules\juce_audio_basics\effects\juce_Reverb.h"/>
         </Filter>
         <Filter Name="sources">

extras/static library/Builds/VisualStudio2010/juce.vcxproj

@@ -151,6 +151,9 @@
     <ClCompile Include="..\..\..\..\modules\juce_audio_basics\effects\juce_IIRFilter.cpp">
       <ExcludedFromBuild>true</ExcludedFromBuild>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\modules\juce_audio_basics\effects\juce_LagrangeInterpolator.cpp">
+      <ExcludedFromBuild>true</ExcludedFromBuild>
+    </ClCompile>
     <ClCompile Include="..\..\..\..\modules\juce_audio_basics\sources\juce_BufferingAudioSource.cpp">
       <ExcludedFromBuild>true</ExcludedFromBuild>
     </ClCompile>
@@ -1199,6 +1202,7 @@
     <ClInclude Include="..\..\..\..\modules\juce_audio_basics\midi\juce_MidiMessageSequence.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_basics\effects\juce_Decibels.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_basics\effects\juce_IIRFilter.h"/>
+    <ClInclude Include="..\..\..\..\modules\juce_audio_basics\effects\juce_LagrangeInterpolator.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_basics\effects\juce_Reverb.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_basics\sources\juce_AudioSource.h"/>
     <ClInclude Include="..\..\..\..\modules\juce_audio_basics\sources\juce_BufferingAudioSource.h"/>

extras/static library/Builds/VisualStudio2010/juce.vcxproj.filters

@@ -331,6 +331,9 @@
     <ClCompile Include="..\..\..\..\modules\juce_audio_basics\effects\juce_IIRFilter.cpp">
       <Filter>Juce Modules\juce_audio_basics\effects</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\modules\juce_audio_basics\effects\juce_LagrangeInterpolator.cpp">
+      <Filter>Juce Modules\juce_audio_basics\effects</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\..\..\modules\juce_audio_basics\sources\juce_BufferingAudioSource.cpp">
       <Filter>Juce Modules\juce_audio_basics\sources</Filter>
     </ClCompile>
@@ -1500,6 +1503,9 @@
     <ClInclude Include="..\..\..\..\modules\juce_audio_basics\effects\juce_IIRFilter.h">
       <Filter>Juce Modules\juce_audio_basics\effects</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\modules\juce_audio_basics\effects\juce_LagrangeInterpolator.h">
+      <Filter>Juce Modules\juce_audio_basics\effects</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\..\..\modules\juce_audio_basics\effects\juce_Reverb.h">
       <Filter>Juce Modules\juce_audio_basics\effects</Filter>
     </ClInclude>

modules/juce_audio_basics/effects/juce_LagrangeInterpolator.cpp

@@ -0,0 +1,201 @@
+/*
+  ==============================================================================
+
+   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.
+
+  ==============================================================================
+*/
+
+namespace LagrangeHelpers
+{
+    template <int k>
+    struct ResampleHelper
+    {
+        static forcedinline void calc (float& a, float b) { a *= b * (1.0f / k); }
+    };
+
+    template<>
+    struct ResampleHelper <0>
+    {
+        static forcedinline void calc (float&, float) {}
+    };
+
+    template <int k>
+    static forcedinline float calcCoefficient (float input, const float offset) noexcept
+    {
+        ResampleHelper <0 - k>::calc (input, -2.0f - offset);
+        ResampleHelper <1 - k>::calc (input, -1.0f - offset);
+        ResampleHelper <2 - k>::calc (input,  0.0f - offset);
+        ResampleHelper <3 - k>::calc (input,  1.0f - offset);
+        ResampleHelper <4 - k>::calc (input,  2.0f - offset);
+        return input;
+    }
+
+    static forcedinline float valueAtOffset (const float* const inputs, const float offset) noexcept
+    {
+        return calcCoefficient<0> (inputs[4], offset)
+             + calcCoefficient<1> (inputs[3], offset)
+             + calcCoefficient<2> (inputs[2], offset)
+             + calcCoefficient<3> (inputs[1], offset)
+             + calcCoefficient<4> (inputs[0], offset);
+    }
+
+    static forcedinline void push (float* inputs, const float newValue) noexcept
+    {
+        inputs[4] = inputs[3];
+        inputs[3] = inputs[2];
+        inputs[2] = inputs[1];
+        inputs[1] = inputs[0];
+        inputs[0] = newValue;
+    }
+}
+
+//==============================================================================
+LagrangeInterpolator::LagrangeInterpolator()  { reset(); }
+LagrangeInterpolator::~LagrangeInterpolator() {}
+
+void LagrangeInterpolator::reset() noexcept
+{
+    subSamplePos = 1.0;
+
+    for (int i = 0; i < numElementsInArray (lastInputSamples); ++i)
+        lastInputSamples[i] = 0;
+}
+
+int LagrangeInterpolator::process (const double actualRatio, const float* in,
+                                  float* out, const int numOut) noexcept
+{
+    if (actualRatio == 1.0)
+    {
+        memcpy (out, in, numOut * sizeof (float));
+
+        if (numOut >= 4)
+        {
+            memcpy (lastInputSamples, in + (numOut - 4), 4 * sizeof (float));
+        }
+        else
+        {
+            for (int i = 0; i < numOut; ++i)
+                LagrangeHelpers::push (lastInputSamples, in[i]);
+        }
+
+        return numOut;
+    }
+
+    const float* const originalIn = in;
+    double pos = subSamplePos;
+
+    if (actualRatio < 1.0)
+    {
+        for (int i = numOut; --i >= 0;)
+        {
+            if (pos >= 1.0)
+            {
+                LagrangeHelpers::push (lastInputSamples, *in++);
+                pos -= 1.0;
+            }
+
+            *out++ = LagrangeHelpers::valueAtOffset (lastInputSamples, (float) pos);
+            pos += actualRatio;
+        }
+    }
+    else
+    {
+        for (int i = numOut; --i >= 0;)
+        {
+            while (pos < actualRatio)
+            {
+                LagrangeHelpers::push (lastInputSamples, *in++);
+                pos += 1.0;
+            }
+
+            *out++ = LagrangeHelpers::valueAtOffset (lastInputSamples, 1.0f - (float) pos);
+            pos -= actualRatio;
+        }
+    }
+
+    subSamplePos = pos;
+    return in - originalIn;
+}
+
+int LagrangeInterpolator::processAdding (const double actualRatio, const float* in,
+                                         float* out, const int numOut, const float gain) noexcept
+{
+    if (actualRatio == 1.0)
+    {
+        if (gain != 1.0f)
+        {
+            for (int i = 0; i < numOut; ++i)
+                out[i] += in[i] * gain;
+        }
+        else
+        {
+            for (int i = 0; i < numOut; ++i)
+                out[i] += in[i];
+        }
+
+        if (numOut >= 4)
+        {
+            memcpy (lastInputSamples, in + (numOut - 4), 4 * sizeof (float));
+        }
+        else
+        {
+            for (int i = 0; i < numOut; ++i)
+                LagrangeHelpers::push (lastInputSamples, in[i]);
+        }
+
+        return numOut;
+    }
+
+    const float* const originalIn = in;
+    double pos = subSamplePos;
+
+    if (actualRatio < 1.0)
+    {
+        for (int i = numOut; --i >= 0;)
+        {
+            if (pos >= 1.0)
+            {
+                LagrangeHelpers::push (lastInputSamples, *in++);
+                pos -= 1.0;
+            }
+
+            *out++ += gain * LagrangeHelpers::valueAtOffset (lastInputSamples, (float) pos);
+            pos += actualRatio;
+        }
+    }
+    else
+    {
+        for (int i = numOut; --i >= 0;)
+        {
+            while (pos < actualRatio)
+            {
+                LagrangeHelpers::push (lastInputSamples, *in++);
+                pos += 1.0;
+            }
+
+            *out++ += gain * LagrangeHelpers::valueAtOffset (lastInputSamples, 1.0f - (float) pos);
+            pos -= actualRatio;
+        }
+    }
+
+    subSamplePos = pos;
+    return in - originalIn;
+}

modules/juce_audio_basics/effects/juce_LagrangeInterpolator.h

@@ -0,0 +1,94 @@
+/*
+  ==============================================================================
+
+   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 __JUCE_LAGRANGEINTERPOLATOR_JUCEHEADER__
+#define __JUCE_LAGRANGEINTERPOLATOR_JUCEHEADER__
+
+//==============================================================================
+/**
+    Interpolator for resampling a stream of floats using 4-point lagrange interpolation.
+
+    Note that the resampler is stateful, so when there's a break in the continuity
+    of the input stream you're feeding it, you should call reset() before feeding
+    it any new data. And like with any other stateful filter, if you're resampling
+    multiple channels, make sure each one uses its own LagrangeInterpolator
+    object.
+*/
+class JUCE_API  LagrangeInterpolator
+{
+public:
+    LagrangeInterpolator();
+    ~LagrangeInterpolator();
+
+    /** Resets the state of the interpolator.
+        Call this when there's a break in the continuity of the input data stream.
+    */
+    void reset() noexcept;
+
+    /** Resamples a stream of samples.
+
+        @param speedRatio       the number of input samples to use for each output sample
+        @param inputSamples     the source data to read from. This must contain at
+                                least (speedRatio * numOutputSamplesToProduce) samples.
+        @param outputSamples    the buffer to write the results into
+        @param numOutputSamplesToProduce    the number of output samples that should be created
+
+        @returns the actual number of input samples that were used
+    */
+    int process (double speedRatio,
+                 const float* inputSamples,
+                 float* outputSamples,
+                 int numOutputSamplesToProduce) noexcept;
+
+    /** Resamples a stream of samples, adding the results to the output data
+        with a gain.
+
+        @param speedRatio       the number of input samples to use for each output sample
+        @param inputSamples     the source data to read from. This must contain at
+                                least (speedRatio * numOutputSamplesToProduce) samples.
+        @param outputSamples    the buffer to write the results to - the result values will be added
+                                to any pre-existing data in this buffer after being multiplied by
+                                the gain factor
+        @param numOutputSamplesToProduce    the number of output samples that should be created
+        @param gain             a gain factor to multiply the resulting samples by before
+                                adding them to the destination buffer
+
+        @returns the actual number of input samples that were used
+     */
+    int processAdding (double speedRatio,
+                       const float* inputSamples,
+                       float* outputSamples,
+                       int numOutputSamplesToProduce,
+                       float gain) noexcept;
+
+private:
+    float lastInputSamples[5];
+    double subSamplePos;
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (LagrangeInterpolator)
+};
+
+
+#endif   // __JUCE_LAGRANGEINTERPOLATOR_JUCEHEADER__

modules/juce_audio_basics/juce_audio_basics.cpp

@@ -45,6 +45,7 @@ namespace juce
 #include "buffers/juce_AudioDataConverters.cpp"
 #include "buffers/juce_AudioSampleBuffer.cpp"
 #include "effects/juce_IIRFilter.cpp"
+#include "effects/juce_LagrangeInterpolator.cpp"
 #include "midi/juce_MidiBuffer.cpp"
 #include "midi/juce_MidiFile.cpp"
 #include "midi/juce_MidiKeyboardState.cpp"

modules/juce_audio_basics/juce_audio_basics.h

@@ -45,6 +45,9 @@ namespace juce
 #ifndef __JUCE_IIRFILTER_JUCEHEADER__
  #include "effects/juce_IIRFilter.h"
 #endif
+#ifndef __JUCE_LAGRANGEINTERPOLATOR_JUCEHEADER__
+ #include "effects/juce_LagrangeInterpolator.h"
+#endif
 #ifndef __JUCE_REVERB_JUCEHEADER__
  #include "effects/juce_Reverb.h"
 #endif