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122 lines
3.7 KiB
C++
122 lines
3.7 KiB
C++
//
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// AudioPan.h
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// hifi
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//
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// Created by Craig Hansen-Sturm on 9/1/14.
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// Copyright 2014 High Fidelity, Inc.
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//
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// Distributed under the Apache License, Version 2.0.
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// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
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//
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#ifndef hifi_AudioPan_h
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#define hifi_AudioPan_h
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class AudioPan
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{
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float32_t _pan;
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float32_t _gainLeft;
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float32_t _gainRight;
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static float32_t ONE_MINUS_EPSILON;
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static float32_t ZERO_PLUS_EPSILON;
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static float32_t ONE_HALF_MINUS_EPSILON;
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static float32_t ONE_HALF_PLUS_EPSILON;
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void updateCoefficients();
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public:
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AudioPan();
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~AudioPan();
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void initialize();
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void finalize();
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void reset();
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void setParameters(const float32_t pan);
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void getParameters(float32_t& pan);
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void render(AudioBufferFloat32& frameBuffer);
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};
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inline void AudioPan::render(AudioBufferFloat32& frameBuffer) {
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if (frameBuffer.getChannelCount() != 2) {
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return;
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}
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float32_t** samples = frameBuffer.getFrameData();
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bool frameAlignment16 = (frameBuffer.getFrameCount() & 0x0F) == 0;
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if (frameAlignment16) {
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if (frameBuffer.getChannelCount() == 2) {
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for (uint32_t i = 0; i < frameBuffer.getFrameCount(); i += 16) {
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samples[0][i + 0] *= _gainLeft;
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samples[0][i + 1] *= _gainLeft;
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samples[0][i + 2] *= _gainLeft;
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samples[0][i + 3] *= _gainLeft;
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samples[0][i + 4] *= _gainLeft;
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samples[0][i + 5] *= _gainLeft;
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samples[0][i + 6] *= _gainLeft;
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samples[0][i + 7] *= _gainLeft;
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samples[0][i + 8] *= _gainLeft;
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samples[0][i + 9] *= _gainLeft;
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samples[0][i + 10] *= _gainLeft;
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samples[0][i + 11] *= _gainLeft;
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samples[0][i + 12] *= _gainLeft;
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samples[0][i + 13] *= _gainLeft;
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samples[0][i + 14] *= _gainLeft;
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samples[0][i + 15] *= _gainLeft;
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samples[1][i + 0] *= _gainRight;
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samples[1][i + 1] *= _gainRight;
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samples[1][i + 2] *= _gainRight;
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samples[1][i + 3] *= _gainRight;
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samples[1][i + 4] *= _gainRight;
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samples[1][i + 5] *= _gainRight;
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samples[1][i + 6] *= _gainRight;
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samples[1][i + 7] *= _gainRight;
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samples[1][i + 8] *= _gainRight;
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samples[1][i + 9] *= _gainRight;
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samples[1][i + 10] *= _gainRight;
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samples[1][i + 11] *= _gainRight;
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samples[1][i + 12] *= _gainRight;
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samples[1][i + 13] *= _gainRight;
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samples[1][i + 14] *= _gainRight;
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samples[1][i + 15] *= _gainRight;
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}
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} else {
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assert("unsupported channel format");
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}
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} else {
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for (uint32_t i = 0; i < frameBuffer.getFrameCount(); i += 1) {
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samples[0][i] *= _gainLeft;
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samples[1][i] *= _gainRight;
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}
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}
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}
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inline void AudioPan::updateCoefficients() {
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// implement constant power sin^2 + cos^2 = 1 panning law
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if (_pan >= ONE_MINUS_EPSILON) { // full right
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_gainLeft = 0.0f;
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_gainRight = 1.0f;
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} else if (_pan <= ZERO_PLUS_EPSILON) { // full left
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_gainLeft = 1.0f;
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_gainRight = 0.0f;
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} else if ((_pan >= ONE_HALF_MINUS_EPSILON) && (_pan <= ONE_HALF_PLUS_EPSILON)) { // center
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_gainLeft = 1.0f / SQUARE_ROOT_OF_2;
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_gainRight = 1.0f / SQUARE_ROOT_OF_2;
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} else { // intermediate cases
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_gainLeft = cosf( TWO_PI * _pan );
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_gainRight = sinf( TWO_PI * _pan );
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}
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}
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#endif // AudioPan_h
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