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+
+/*
+ * PortAudio Portable Real-Time Audio Library
+ * Latest Version at: http://www.portaudio.com
+ *
+ * Copyright (c) 1999-2010 Phil Burk and Ross Bencina
+ *
+ * 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.
+ */
+
+/*
+ * The text above constitutes the entire PortAudio license; however,
+ * the PortAudio community also makes the following non-binding requests:
+ *
+ * Any person wishing to distribute modifications to the Software is
+ * requested to send the modifications to the original developer so that
+ * they can be incorporated into the canonical version. It is also
+ * requested that these non-binding requests be included along with the
+ * license above.
+ */
+
+#ifndef _AUDIO_ANALYZER_H
+#define _AUDIO_ANALYZER_H
+
+#include "biquad_filter.h"
+
+#define MATH_PI  (3.141592653589793238462643)
+#define MATH_TWO_PI  (2.0 * MATH_PI)
+
+typedef struct PaQaSineGenerator_s
+{
+    double    phase;
+    double    phaseIncrement;
+    double    frequency;
+    double    amplitude;
+} PaQaSineGenerator;
+
+/** Container for a monophonic audio sample in memory. */
+typedef struct PaQaRecording_s
+{
+    /** Maximum number of frames that can fit in the allocated buffer. */
+    int       maxFrames;
+    float    *buffer;
+    /** Actual number of valid frames in the buffer. */
+    int       numFrames;
+    int       sampleRate;
+} PaQaRecording;
+
+typedef struct PaQaTestTone_s
+{
+    int       samplesPerFrame;
+    int       startDelay;
+    double    sampleRate;
+    double    frequency;
+    double    amplitude;
+} PaQaTestTone;
+
+typedef struct PaQaAnalysisResult_s
+{
+    int       valid;
+    /** Latency in samples from output to input. */
+    double    latency;
+    double    amplitudeRatio;
+    double    popAmplitude;
+    double    popPosition;
+    double    numDroppedFrames;
+    double    droppedFramesPosition;
+    double    numAddedFrames;
+    double    addedFramesPosition;
+} PaQaAnalysisResult;
+
+
+/*================================================================*/
+/*================= General DSP Tools ============================*/
+/*================================================================*/
+/**
+ * Calculate Nth frequency of a series for use in testing multiple channels.
+ * Series should avoid harmonic overlap between channels.
+ */
+double PaQa_GetNthFrequency( double baseFrequency, int index );
+
+void PaQa_EraseBuffer( float *buffer, int numFrames, int samplesPerFrame );
+
+void PaQa_MixSine( PaQaSineGenerator *generator, float *buffer, int numSamples, int stride );
+
+void PaQa_WriteSine( float *buffer, int numSamples, int stride,
+                     double frequency, double amplitude );
+
+/**
+ * Generate a signal with a sharp edge in the middle that can be recognized despite some phase shift.
+ */
+void PaQa_GenerateCrack( float *buffer, int numSamples, int stride );
+
+double PaQa_ComputePhaseDifference( double phase1, double phase2 );
+
+/**
+ * Measure the area under the curve by summing absolute value of each value.
+ */
+double PaQa_MeasureArea( float *buffer, int numFrames, int stride  );
+
+/**
+ * Measure slope of the positive zero crossings.
+ */
+double PaQa_MeasureCrossingSlope( float *buffer, int numFrames );
+
+
+/**
+ * Prepare an oscillator that can generate a sine tone for testing.
+ */
+void PaQa_SetupSineGenerator( PaQaSineGenerator *generator, double frequency, double amplitude, double frameRate );
+
+/*================================================================*/
+/*================= Recordings ===================================*/
+/*================================================================*/
+/**
+ * Allocate memory for containing a mono audio signal. Set up recording for writing.
+ */
+ int PaQa_InitializeRecording( PaQaRecording *recording, int maxSamples, int sampleRate );
+
+/**
+* Free memory allocated by PaQa_InitializeRecording.
+ */
+ void PaQa_TerminateRecording( PaQaRecording *recording );
+
+/**
+ * Apply a biquad filter to the audio from the input recording and write it to the output recording.
+ */
+void PaQa_FilterRecording( PaQaRecording *input, PaQaRecording *output, BiquadFilter *filter );
+
+
+int PaQa_SaveRecordingToWaveFile( PaQaRecording *recording, const char *filename );
+
+/**
+ * @param stride is the spacing of samples to skip in the input buffer. To use every samples pass 1. To use every other sample pass 2.
+ */
+int PaQa_WriteRecording( PaQaRecording *recording, float *buffer, int numSamples, int stride );
+
+/** Write zeros into a recording. */
+int PaQa_WriteSilence( PaQaRecording *recording, int numSamples );
+
+int PaQa_RecordFreeze( PaQaRecording *recording, int numSamples );
+
+double PaQa_CorrelateSine( PaQaRecording *recording, double frequency, double frameRate,
+                           int startFrame, int numSamples, double *phasePtr );
+
+double PaQa_FindFirstMatch( PaQaRecording *recording, float *buffer, int numSamples, double tolerance  );
+
+/**
+ * Estimate the original amplitude of a clipped sine wave by measuring
+ * its average slope at the zero crossings.
+ */
+double PaQa_MeasureSineAmplitudeBySlope( PaQaRecording *recording,
+                                         double frequency, double frameRate,
+                                         int startFrame, int numFrames );
+
+double PaQa_MeasureRootMeanSquare( float *buffer, int numFrames );
+
+/**
+ * Compare the amplitudes of these two signals.
+ * Return ratio of recorded signal over buffer signal.
+ */
+double PaQa_CompareAmplitudes( PaQaRecording *recording, int startAt, float *buffer, int numSamples );
+
+/**
+ * Analyse a recording of a sine wave.
+ * Measure latency and look for dropped frames, etc.
+ */
+int PaQa_AnalyseRecording( PaQaRecording *recording, PaQaTestTone *testTone, PaQaAnalysisResult *analysisResult );
+
+#endif /* _AUDIO_ANALYZER_H */