mirror of
https://github.com/FBukovina/Atoll.git
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c7d470da2fThis commit effectively grants [the "Atoll" project](https://github.com/Ebullioscopic/Atoll) permission from [ZephyrCodesStuff](https://github.com/ZephyrCodesStuff) for using, modifying and distributing the source code contained in [`rtaudio`](https://github.com/ZephyrCodesStuff/rtaudio) in compliance with the terms of the GPLv3 license, as an alternative to its original AGPLv3 license for this specific integration.
68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
/*
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* Atoll (DynamicIsland)
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* Original work Copyright (C) 2026 ZephyrCodesStuff (https://github.com/ZephyrCodesStuff/rtaudio)
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* Modified work Copyright (C) 2026 Atoll Contributors
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*
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* Real-time audio processor using Accelerate framework for efficient RMS
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* and biquad filtering.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef AUDIOPROCESSOR_HPP
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#define AUDIOPROCESSOR_HPP
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#include <Accelerate/Accelerate.h>
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#include <atomic>
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class AudioProcessor {
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private:
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static constexpr int kBlockSize = 512;
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static constexpr int kBands = 4;
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static constexpr float kAttack = 0.85f; // fast rise
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static constexpr float kRelease = 0.40f; // slower fall — more musical
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static constexpr float kGains[kBands] = { 3.5f, 6.0f, 9.0f, 20.0f };
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float sampleRate;
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int writePos = 0;
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float mono[kBlockSize] = {};
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float filtered[kBlockSize] = {};
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vDSP_biquad_Setup setups[kBands];
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alignas( 16 ) float delays[kBands][4] = {};
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float envelopes[kBands] = {};
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// Lock-free: audio thread writes, render thread reads
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// One atomic per band — fits in a cache line
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alignas( 64 ) std::atomic< float > bandParams[kBands] = {};
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public:
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explicit AudioProcessor( float sr = 48000.0f );
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~AudioProcessor();
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// Called by CoreAudio — must be real-time safe (no alloc, no locks)
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void process( const float* __restrict__ buffer, int totalSamples );
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// Called by render thread — lock-free read
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float getBand( int i ) const;
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private:
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enum class FilterType { LowPass, BandPass, HighPass };
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void processBlock();
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void setupBiquad( int idx, FilterType type, float freq, float q );
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};
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#endif // AUDIOPROCESSOR_HPP
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