New algorithmic stereo reverb

libraries/audio/src/AudioReverb.h

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+//
+//  AudioReverb.h
+//  libraries/audio/src
+//
+//  Created by Ken Cooke on 10/11/15.
+//  Copyright 2015 High Fidelity, Inc.
+//
+
+#ifndef hifi_AudioReverb_h
+#define hifi_AudioReverb_h
+
+#include "stdint.h"
+
+typedef struct ReverbParameters {
+
+    float sampleRate;       // [24000, 48000] Hz
+    float bandwidth;        // [20, 24000] Hz
+
+    float preDelay;         // [0, 333] ms
+    float lateDelay;        // [0, 166] ms
+
+    float reverbTime;       // [0.1, 100] seconds
+
+    float earlyDiffusion;   // [0, 100] percent
+    float lateDiffusion;    // [0, 100] percent
+
+    float roomSize;         // [0, 100] percent
+    float density;          // [0, 100] percent
+
+    float bassMult;         // [0.1, 10] ratio
+    float bassFreq;         // [10, 500] Hz
+    float highGain;         // [-24, 0] dB
+    float highFreq;         // [1000, 12000] Hz
+
+    float modRate;          // [0.1, 10] Hz
+    float modDepth;         // [0, 100] percent
+
+    float earlyGain;        // [-96, +24] dB
+    float lateGain;         // [-96, +24] dB
+
+    float earlyMixLeft;     // [0, 100] percent
+    float earlyMixRight;    // [0, 100] percent
+    float lateMixLeft;      // [0, 100] percent
+    float lateMixRight;     // [0, 100] percent
+
+    float wetDryMix;        // [0, 100] percent
+
+} ReverbParameters;
+
+class ReverbImpl;
+
+class AudioReverb {
+
+    ReverbImpl *_impl;
+    ReverbParameters _params;
+
+    float* _inout[2];
+    void convertInputFromInt16(const int16_t* input, float** outputs, int numFrames);
+    void convertOutputToInt16(float** inputs, int16_t* output, int numFrames);
+
+public:
+    AudioReverb(float sampleRate);
+    ~AudioReverb();
+
+    void setParameters(ReverbParameters *p);
+    void getParameters(ReverbParameters *p);
+    void reset();
+
+    // deinterleaved float input/output (native format)
+    void render(float** inputs, float** outputs, int numFrames);
+
+    // interleaved int16_t input/output
+    void render(const int16_t* input, int16_t* output, int numFrames);
+};
+
+#endif // hifi_AudioReverb_h