Repository Analysis

kyleneideck/BackgroundMusic

Background Music, a macOS audio utility: automatically pause your music, set individual apps' volumes and record system audio.

8.7 Low AI signal View on GitHub

Analysis Overview

This report presents the forensic synthetic code analysis of kyleneideck/BackgroundMusic, a C++ project with 19,134 GitHub stars. SynthScan v2.0 examined 53,098 lines of code across 257 source files, recording 395 pattern matches distributed across 6 syntactic categories. The overall adjusted score of 8.7 places this repository in the Low AI signal band.

The scanner applied 160+ deterministic lexical heuristics, multi-line block detectors, abstract syntax tree depth profilers, and a cross-file Jaccard similarity matrix to construct a statistically normalised synthetic code estimate. All matches are individually weighted by severity coefficient and contextual multiplier before summation, and the resulting headline score is temporally discounted to account for the repository's development history relative to the commercial emergence of large language model coding tooling (November 2022 onward).

8.7
Adjusted Score
8.7
Raw Score
100%
Time Factor
2026-06-10
Last Push
19.1K
Stars
C++
Language
53.1K
Lines of Code
257
Files
395
Pattern Hits
2026-07-14
Scan Date
0.02
HC Hit Rate

What These Metrics Mean

Adjusted Score
Primary synthetic code indicator. Raw score normalised per 1,000 lines of code and multiplied by the temporal discount factor. This is the definitive comparative metric — use it to rank repositories by AI authorship density.
Raw Score
The unmodified sum of all severity-weighted, context-multiplied pattern match scores before temporal discounting. Reflects the absolute signal strength independent of when the repository was last active.
Time Factor
The temporal discount multiplier (0–100%) applied to the raw score. Repositories last updated before ChatGPT's launch (Nov 2022) receive a 5% factor. Full signal is only assigned to repositories active in the post-adoption era (Jan 2024+).
Pattern Hits
Total count of individual pattern matches across all files and categories. A high hit count with a low score may indicate a very large codebase with isolated AI snippets; a low count with a high score indicates dense, concentrated AI signatures.
HC Hit Rate
High+Critical pattern hits per file, averaged across the repository. This orthogonal signal catches repositories where a few files are densely packed with high-severity AI tells — a strong indicator even when the normalised score appears moderate due to codebase size.
Lines of Code / Files
Total lines and files analysed. The scanner examines 94 file extensions. These denominators are used to normalise the score, enabling fair comparison between repositories of vastly different sizes.

Score History

This chart maps the temporal evolution of the adjusted synthetic code score across successive scan runs. An upward trajectory indicates ongoing incorporation of AI-generated code or expanding LLM-assisted scaffolding; a stable or declining trajectory may reflect active human refactoring, code removal, or the adoption of stricter authorship policies. The dashed secondary line (right axis) independently tracks total raw pattern hit count, which can diverge from the normalised score when codebase size changes significantly between scans.

Severity Breakdown

Classifies detected patterns by their diagnostic confidence and structural impact. CRITICAL patterns (coefficient 10) represent definitive synthetic signatures — hallucinated imports, explicit LLM attribution metadata — virtually never produced by human authors. HIGH (5) indicates strong structural tells such as cross-file repetition or cross-linguistic idioms. MEDIUM (2) covers recognisable conversational padding and AI-specific vocabulary. LOW (1) captures subtle indicators like tautological comments and generic boilerplate that require density to carry independent signal.

CRITICAL 0HIGH 5MEDIUM 18LOW 372

Directory Score Breakdown

This horizontal bar chart decomposes the repository's raw synthetic code score by top-level directory, allowing you to pinpoint precisely which modules or components carry the highest AI authorship density. Directories with disproportionately high scores relative to their size warrant targeted manual review: concentrated AI signatures often trace back to mass-generated configuration layers, auto-ported test suites, LLM-scaffolded boilerplate classes, or entire subsystems authored under heavy copilot assistance. Use this view to prioritise your human code-review effort.

Pattern Findings

The scanner identified 395 distinct pattern matches across 6 syntactic categories. Each entry below represents a discrete location in the source code where the engine recorded a statistically significant AI authorship indicator. Expand any category row to inspect the individual file paths, line numbers, code snippets, and the lexical context (CODE, COMMENT, or STRING) in which each match was detected.

Reading the findings table: The Severity column indicates the diagnostic confidence level (CRITICAL / HIGH / MEDIUM / LOW). The Context column identifies whether the match occurred inside executable code, an inline comment, or a string literal — comment-context matches receive a ×1.5 weight because LLMs systematically over-annotate. The ⚡ bolt icon marks clustered matches: three or more patterns within a 10-line window, each receiving an additional ×1.5 density multiplier as dense clusters constitute far stronger evidence of synthetic authorship than isolated hits.

Over-Commented Block369 hits · 369 pts
SeverityFileLineSnippetContext
LOWuninstall.sh1#!/bin/bashCOMMENT
LOWbuild_and_install.sh1#!/bin/bashCOMMENT
LOWbuild_and_install.sh21#COMMENT
LOWbuild_and_install.sh821COMMENT
LOWpackage.sh1#!/bin/bashCOMMENT
LOWpackage.sh21#COMMENT
LOWpackage.sh81COMMENT
LOWBGMDriver/BGMDriver/BGM_PlugInInterface.cpp1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_PlugInInterface.cpp21// Copyright (C) 2013 Apple Inc. All Rights Reserved.COMMENT
LOWBGMDriver/BGMDriver/BGM_NullDevice.cpp1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_NullDevice.cpp21//COMMENT
LOWBGMDriver/BGMDriver/BGM_NullDevice.h1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_NullDevice.h21//COMMENT
LOWBGMDriver/BGMDriver/BGM_XPCHelper.m1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_XPCHelper.m21// Copyright © 2020 Aleksey YurkevichCOMMENT
LOWBGMDriver/BGMDriver/BGM_AbstractDevice.cpp1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_AbstractDevice.cpp261 CAException(kAudioHardwareBadPropertySizeError),COMMENT
LOWBGMDriver/BGMDriver/BGM_AudibleState.cpp1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_AudibleState.cpp21// Copyright © 2016 Josh JunonCOMMENT
LOWBGMDriver/BGMDriver/BGM_AudibleState.h1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_AudibleState.h21//COMMENT
LOWBGMDriver/BGMDriver/BGM_Control.cpp1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_Stream.cpp1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_Stream.cpp21//COMMENT
LOWBGMDriver/BGMDriver/BGM_VolumeControl.h1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_PlugIn.cpp1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_PlugIn.cpp21// Copyright (C) 2013 Apple Inc. All Rights Reserved.COMMENT
LOWBGMDriver/BGMDriver/BGM_Object.h1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_Object.h21// Copyright (C) 2013 Apple Inc. All Rights Reserved.COMMENT
LOWBGMDriver/BGMDriver/BGM_Object.h41// TODO: Update the large comment below to reflect what was removed from SA_Object.h? It hasn'tCOMMENT
LOWBGMDriver/BGMDriver/BGM_Object.h61// its base class is kAudioBooleanControlClassID.COMMENT
LOWBGMDriver/BGMDriver/BGM_Object.h81// object. This also means taking care to handle the Deactivation of owned objects. For example, anCOMMENT
LOWBGMDriver/BGMDriver/BGM_Object.h101// This class also defines methods to implement the portion of theCOMMENT
LOWBGMDriver/BGMDriver/BGM_MuteControl.h1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_MuteControl.h21//COMMENT
LOWBGMDriver/BGMDriver/BGM_Device.cpp1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_Device.cpp21// Copyright © 2017 Andrew TonnerCOMMENT
LOWBGMDriver/BGMDriver/BGM_Device.cpp41#include "CAException.h"COMMENT
LOWBGMDriver/BGMDriver/BGM_Device.cpp661 outDataSize = sizeof(UInt32);COMMENT
LOWBGMDriver/BGMDriver/BGM_XPCHelper.h1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_XPCHelper.h21//COMMENT
LOWBGMDriver/BGMDriver/BGM_AbstractDevice.h1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_TaskQueue.cpp1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_TaskQueue.cpp21//COMMENT
LOWBGMDriver/BGMDriver/BGM_Object.cpp1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_Object.cpp21// Copyright (C) 2013 Apple Inc. All Rights Reserved.COMMENT
LOWBGMDriver/BGMDriver/BGM_Stream.h1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_Stream.h21// An input or output audio stream. Each stream belongs to a device (see BGM_AbstractDevice), whichCOMMENT
LOWBGMDriver/BGMDriver/BGM_MuteControl.cpp1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_MuteControl.cpp21//COMMENT
LOWBGMDriver/BGMDriver/BGM_TaskQueue.h1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_TaskQueue.h21//COMMENT
LOWBGMDriver/BGMDriver/BGM_TaskQueue.h141 CAPThread mRealTimeThread;COMMENT
LOWBGMDriver/BGMDriver/BGM_TaskQueue.h161 semaphore_t mRealTimeThreadSyncTaskCompletedSemaphore;COMMENT
LOWBGMDriver/BGMDriver/BGM_Control.h1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_VolumeControl.cpp1// This file is part of Background Music.COMMENT
LOWBGMDriver/BGMDriver/BGM_VolumeControl.cpp21// Copyright (C) 2013 Apple Inc. All Rights Reserved.COMMENT
LOWBGMDriver/BGMDriver/BGM_VolumeControl.cpp381 // Apply the amount of gain/loss for the current volume to the audio signal by multiplyingCOMMENT
LOWBGMDriver/BGMDriver/BGM_VolumeControl.cpp421 // device (more specifically, a linear mapping of it onto [0,1]) or macOS's volume slidersCOMMENT
LOWBGMDriver/BGMDriver/BGM_PlugIn.h1// This file is part of Background Music.COMMENT
309 more matches not shown…
Self-Referential Comments14 hits · 42 pts
SeverityFileLineSnippetContext
MEDIUMuninstall.sh4# This file is part of Background Music.COMMENT
MEDIUMbuild_and_install.sh4# This file is part of Background Music.COMMENT
MEDIUMpackage.sh4# This file is part of Background Music.COMMENT
MEDIUMBGMDriver/BGMDriver/quick_install.sh4# This file is part of Background Music.COMMENT
MEDIUMBGMApp/BGMApp/_uninstall-non-interactive.sh4# This file is part of Background Music.COMMENT
MEDIUMBGMApp/BGMAppTests/UITests/skip-ui-tests.py3# This file is part of Background Music.COMMENT
MEDIUMBGMApp/BGMXPCHelper/post_install.sh4# This file is part of Background Music.COMMENT
MEDIUMBGMApp/BGMXPCHelper/post_install.sh98# Create an unprivileged user for BGMXPCHelper to run as.COMMENT
MEDIUMBGMApp/BGMXPCHelper/post_install.sh120 # Create the group.COMMENT
MEDIUMBGMApp/BGMXPCHelper/post_install.sh125 # Create the user.COMMENT
MEDIUMBGMApp/BGMXPCHelper/safe_install_dir.sh4# This file is part of Background Music.COMMENT
MEDIUMBGMApp/BGMXPCHelper/safe_install_dir.sh150# Create the installation directory if it doesn't exist already.COMMENT
MEDIUMImages/generate_icon_pngs.sh4# This file is part of Background Music.COMMENT
MEDIUMSharedSource/Scripts/set-version.sh3# This file is part of Background Music.COMMENT
Synthetic Comment Markers5 hits · 38 pts
SeverityFileLineSnippetContext
HIGHBGMDriver/BGMDriver/BGM_Device.cpp551 // fill out the list with as many objects as requested, which is everythingCOMMENT
HIGHBGMDriver/BGMDriver/BGM_Device.cpp700 // fill out the list with as many objects as requestedCOMMENT
HIGHBGMDriver/BGMDriver/BGM_Device.cpp718 // fill out the list with as many objects as requestedCOMMENT
HIGHBGMDriver/BGMDriver/BGM_Device.cpp732 // fill out the list with as many objects as requestedCOMMENT
HIGHBGMDriver/BGMDriver/BGM_Device.cpp759 // fill out the list with as many objects as requestedCOMMENT
Decorative Section Separators4 hits · 12 pts
SeverityFileLineSnippetContext
MEDIUMpackage.sh55# --------------------------------------------------COMMENT
MEDIUMpackage.sh140# --------------------------------------------------COMMENT
MEDIUMpackage.sh153# --------------------------------------------------COMMENT
MEDIUMpackage.sh220# --------------------------------------------------COMMENT
AI Slop Vocabulary2 hits · 3 pts
SeverityFileLineSnippetContext
LOWBGMDriver/BGMDriver/quick_install.sh91 # The path to the release build was set, so just set it as the build we're installingCOMMENT
LOWBGMDriver/BGMDriver/quick_install.sh94 # The path to the debug build was set, so just set it as the build we're installingCOMMENT
Redundant / Tautological Comments1 hit · 1 pts
SeverityFileLineSnippetContext
LOWbuild_and_install.sh217 exec 3<&- # Close the file descriptor.CODE