Geraint geraintluff
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| // Tanh() saturator with ADAA (1st-order) | |
| // (c) 2026 Signalsmith Audio | |
| // 0BSD Licence, or you can re-distribution with any license you like, just replace this line | |
| #pragma once | |
| #include <cmath> | |
| template<typename Sample> | |
| class TanhSaturator { | |
| // Accuracy limit to avoid divide-by-(almost)-zero |
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| // PCG-32 implementation: https://pcg-random.org/ | |
| // (c) 2026 Signalsmith Audio | |
| // 0BSD Licence, or you can re-distribution with any license you like, just replace this line | |
| #include <random> | |
| struct Pcg32 { | |
| uint64_t state; | |
| static constexpr uint64_t multiply = 6364136223846793005ULL; | |
| uint64_t add; |
geraintluff
/ main.cpp
Created
February 1, 2025 19:15
Test code and output plots comparing two very-close BLAMPs vs a single BLEP, with single-precision float
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| #include "elliptic-blep.h" | |
| #include "plot.h" | |
| #include "simple-fft.h" | |
| #include <vector> | |
| void generateWaveform(float freq, float shape, std::vector<float> &result, bool sawtooth) { | |
| float phase = 0; | |
| float gradUp = freq*2/shape; |
geraintluff
/ apple-clang-16.0.0-warning.h
Last active
January 20, 2025 17:57
Code to break a build when using Apple Clang 16.0.0 with `--fast-math`
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| #if defined(__FAST_MATH__) && (__apple_build_version__ >= 16000000) && (__apple_build_version__ <= 16000099) | |
| # error Apple Clang 16.0.0 is broken, and generates completely incorrect code for some SIMD operations. -ffast-math makes it worse, so if you HAVE to use this version of Clang, you can't enable -ffast-math. | |
| #endif |
geraintluff
/ simple-fft.hpp
Created
January 19, 2025 19:11
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| #include <complex> | |
| #include <vector> | |
| #include <cmath> | |
| #include "./linear.h" | |
| #ifndef M_PI | |
| #define M_PI 3.14159265358979323846 | |
| #endif |
geraintluff
/ json-simplified.js
Created
February 20, 2024 10:26
Simple RegEx for slightly prettier JSON-ish output (unquoted keys, single-item objects/arrays on one line)
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| JSON.simplified = v => { | |
| return JSON.stringify(v, null, '\t') | |
| .replace(/(\n\t*)"([a-z][a-z0-9_]*)"/ig, '$1$2') | |
| .replace(/(\n[\sa-z0-9_:]+)\{\n\t*(.*)\n\t+\}/ig, '$1{$2}') | |
| .replace(/(\n[\sa-z0-9_:]+)\[\n\t*(.*)\n\t+\]/ig, '$1[$2]'); | |
| }; | |
| JSON.parseSimplified = t => { | |
| return JSON.parse(t | |
| .replace(/(\n[\sa-z0-9_:]+)([\[\{])([^\n])/ig, '$1$2\n$3') | |
| .replace(/(\n\t*)([a-z][a-z0-9_]*):/ig, '$1"$2":') |
geraintluff
/ csv-writer.h
Last active
January 25, 2022 13:56
Example of outputting CSV from C++, and picking it up with Python (Matplotlib)
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| #ifndef UTIL_CSV_WRITER | |
| #define UTIL_CSV_WRITER | |
| /* Optional helper class for outputting CSV data. Use like: | |
| CsvWriter csv("out"); // no .csv suffix | |
| // write individual values | |
| csv.write("foo", "bar"); | |
| csv.line(); |
geraintluff
/ unit-range-reciprocal.hpp
Last active
January 8, 2025 20:39
A map from [0-1] to an arbitrary range, specified using low/mid/high values. Pulled out from some Signalsmith Audio internal code.
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| class UnitRangeMapReciprocal { | |
| double vMin, vTopFactor, vBottomFactor; | |
| public: | |
| UnitRangeMapReciprocal() : UnitRangeMapReciprocal(0, 0.5, 1) {} | |
| UnitRangeMapReciprocal(double min, double mid, double max) { | |
| vMin = min; | |
| double k = (mid - min)/(max - mid); | |
| vTopFactor = max*k - min; | |
| vBottomFactor = k - 1; | |
| } |
geraintluff
/ peano-map.json
Created
November 4, 2018 12:02
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| { | |
| "https://twitter.com/every_peano/status/590740112625008641": { | |
| "exact": 0 | |
| }, | |
| "https://twitter.com/every_peano/status/1058469466714132480": { | |
| "relative": "https://twitter.com/every_peano/status/592203098388566016", | |
| "N": 30900 | |
| }, | |
| "https://twitter.com/every_peano/status/1057001290117595139": { | |
| "relative": "https://twitter.com/every_peano/status/1058469466714132480", |
geraintluff
/ ffmpeg-install.sh
Created
March 30, 2016 10:55
— forked from clayton/ffmpeg-install.sh
Install FFMPEG on OS X with HomeBrew to convert Mp4 to WebM
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| # Installation | |
| brew install ffmpeg --with-vpx --with-vorbis --with-libvorbis --with-vpx --with-vorbis --with-theora --with-libogg --with-libvorbis --with-gpl --with-version3 --with-nonfree --with-postproc --with-libaacplus --with-libass --with-libcelt --with-libfaac --with-libfdk-aac --with-libfreetype --with-libmp3lame --with-libopencore-amrnb --with-libopencore-amrwb --with-libopenjpeg --with-openssl --with-libopus --with-libschroedinger --with-libspeex --with-libtheora --with-libvo-aacenc --with-libvorbis --with-libvpx --with-libx264 --with-libxvid | |
| # Easy Peasy | |
| ffmpeg -i video.mp4 video.webm |
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