- initial version

git-svn-id: http://moon:8086/svn/software/trunk/projects/RBM@14 b431acfa-c32f-4a4a-93f1-934dc6c82436
2014-09-24 17:21:29 +00:00
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+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2013 - Raw Material Software Ltd.
+
+   Permission is granted to use this software under the terms of either:
+   a) the GPL v2 (or any later version)
+   b) the Affero GPL v3
+
+   Details of these licenses can be found 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.juce.com for more information.
+
+  ==============================================================================
+*/
+
+#ifndef JUCE_RESAMPLINGAUDIOSOURCE_H_INCLUDED
+#define JUCE_RESAMPLINGAUDIOSOURCE_H_INCLUDED
+
+
+//==============================================================================
+/**
+    A type of AudioSource that takes an input source and changes its sample rate.
+
+    @see AudioSource
+*/
+class JUCE_API  ResamplingAudioSource  : public AudioSource
+{
+public:
+    //==============================================================================
+    /** Creates a ResamplingAudioSource for a given input source.
+
+        @param inputSource              the input source to read from
+        @param deleteInputWhenDeleted   if true, the input source will be deleted when
+                                        this object is deleted
+        @param numChannels              the number of channels to process
+    */
+    ResamplingAudioSource (AudioSource* inputSource,
+                           bool deleteInputWhenDeleted,
+                           int numChannels = 2);
+
+    /** Destructor. */
+    ~ResamplingAudioSource();
+
+    /** Changes the resampling ratio.
+
+        (This value can be changed at any time, even while the source is running).
+
+        @param samplesInPerOutputSample     if set to 1.0, the input is passed through; higher
+                                            values will speed it up; lower values will slow it
+                                            down. The ratio must be greater than 0
+    */
+    void setResamplingRatio (double samplesInPerOutputSample);
+
+    /** Returns the current resampling ratio.
+
+        This is the value that was set by setResamplingRatio().
+    */
+    double getResamplingRatio() const noexcept                  { return ratio; }
+
+    /** Clears any buffers and filters that the resampler is using. */
+    void flushBuffers();
+
+    //==============================================================================
+    void prepareToPlay (int samplesPerBlockExpected, double sampleRate) override;
+    void releaseResources() override;
+    void getNextAudioBlock (const AudioSourceChannelInfo&) override;
+
+private:
+    //==============================================================================
+    OptionalScopedPointer<AudioSource> input;
+    double ratio, lastRatio;
+    AudioSampleBuffer buffer;
+    int bufferPos, sampsInBuffer;
+    double subSampleOffset;
+    double coefficients[6];
+    SpinLock ratioLock;
+    const int numChannels;
+    HeapBlock<float*> destBuffers;
+    HeapBlock<const float*> srcBuffers;
+
+    void setFilterCoefficients (double c1, double c2, double c3, double c4, double c5, double c6);
+    void createLowPass (double proportionalRate);
+
+    struct FilterState
+    {
+        double x1, x2, y1, y2;
+    };
+
+    HeapBlock<FilterState> filterStates;
+    void resetFilters();
+
+    void applyFilter (float* samples, int num, FilterState& fs);
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ResamplingAudioSource)
+};
+
+
+#endif   // JUCE_RESAMPLINGAUDIOSOURCE_H_INCLUDED