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build-compilation-dependencies

Name: Build Compilation Dependencies
Author: software-mansion

// Build system overview for react-native-audio-api across all platforms — CMakeLists.txt, android/build.gradle, RNAudioAPI.podspec, prebuilt external libraries, and the standalone C++ test build. Use this skill when adding a new source file, modifying CMakeLists or podspec, debugging compilation errors, integrating a new dependency, or understanding why includes work differently in tests vs the app. Trigger phrases: "add source file", "CMakeLists", "podspec", "build.gradle", "prebuilt binaries", "FFmpeg disabled", "pod install", "new architecture", "compile error", "undefined symbol", "SIMD", "worklets build flag", "C++ tests", "conditional compilation", "include path", "gradle build fails", "link error".

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stars:776

forks:66

updated:14. April 2026 um 09:42

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audio-nodes.md

from "software-mansion/react-native-audio-api"

C++ audio node engine for react-native-audio-api. Covers the AudioNode class hierarchy, the processNode() audio-thread contract (no allocs, no locks, no blocking I/O), AudioParam a-rate/k-rate processing, cross-thread communication patterns (CrossThreadEventScheduler, IAudioEventHandlerRegistry), and a step-by-step checklist for implementing a new node end-to-end. Use this skill when implementing a new Web Audio API node, modifying audio graph traversal or processing logic, or debugging audio rendering artifacts. Trigger phrases: "add a new node", "implement AudioNode", "processNode", "audio thread", "AudioParam automation".

2026-04-14776

flow.md

from "software-mansion/react-native-audio-api"

End-to-end process for shipping a feature or bug fix in react-native-audio-api. Covers all required deliverables in order: Web Audio API spec review, TypeScript interface and types, C++ AudioNode implementation, HostObject wiring, TypeScript class, TurboModule spec (when needed), C++ tests (Google Test), JS tests (Jest), documentation (audiodocs MDX), and post-work checks. Also covers the bug-fix flow: MRE first, C++ test when applicable, root-cause analysis, post-mortem. Use this skill at the start of any feature implementation or bug fix. Trigger phrases: "implement a feature", "add a node", "fix a bug", "what steps", "where do I start", "PR checklist", "how to write tests".

2026-04-14776

host-objects.md

from "software-mansion/react-native-audio-api"

Covers how to create, structure, and maintain JSI HostObjects that bridge C++ audio nodes to JavaScript in react-native-audio-api. Explains naming conventions, property/method exposure via macros, shadow state for JS↔audio-thread communication, JSI argument parsing, return value patterns, memory pressure, factory wiring in BaseAudioContextHostObject, and common pitfalls. Use this skill when creating a new audio node HostObject, modifying existing HostObject get/set/call logic, wiring a new node into the context factory, or debugging JSI-related crashes and type errors. Trigger phrases: "add HostObject", "create JSI bridge", "expose C++ node to JS", "shadow state", "scheduleAudioEvent from setter", "JSI property getter", "HostObject crashes", "new audio node".

2026-04-14776

post-work-checks.md

from "software-mansion/react-native-audio-api"

Ordered quality gate checklist to run after every code change in react-native-audio-api. Covers formatting, linting, type checking, C++ tests, JS tests, and enum sync validation. Documents what lefthook pre-commit hooks run automatically vs what must be run manually. Use at the end of any implementation task before opening a PR. Trigger phrases: "post-work", "before PR", "before commit", "check quality", "run linter", "run tests", "format code", "lefthook", "pre-commit", "yarn test", "yarn lint".

2026-04-14776

thread-safety-itc.md

from "software-mansion/react-native-audio-api"

Audio thread safety rules, lock-free inter-thread communication patterns, and the audio event system in react-native-audio-api. Covers the three-thread model (JS / audio / worker), CrossThreadEventScheduler for JS→audio scheduling, IAudioEventHandlerRegistry for audio→JS events, AudioGraphManager for graph mutations, shadow state vs atomics decision table, TaskOffloader for off-thread work, and SpscChannel low-level API. Use when implementing cross-thread data flow, adding audio events, debugging thread-safety crashes or data races, or deciding which ITC primitive to use. Trigger phrases: "lock-free", "SPSC", "thread safety", "ITC", "cross-thread", "audio thread race", "scheduleAudioEvent", "invokeHandlerWithEventBody", "TaskOffloader", "off-thread", "SpscChannel", "CrossThreadEventScheduler", "shadow state", "atomic".

2026-04-14776

turbo-modules.md

from "software-mansion/react-native-audio-api"

TurboModule spec, JSI binding injection, and platform native module entry points. Use when adding a new native method to NativeAudioAPIModule.ts, wiring a new top-level HostObject through AudioAPIModuleInstaller, debugging "native module not found" or "undefined is not a function" for a global, or understanding the install() bootstrap flow on iOS and Android. Trigger phrases: "native module not found", "install()", "NativeAudioAPIModule", "injectJSIBindings", "AudioAPIModuleInstaller", "JSI global", "TurboModule spec", "module bootstrap", "undefined is not a function".

2026-04-14776

package.json

"author": "software-mansion"

"repository": "software-mansion/react-native-audio-api"

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SoftwareentwicklerInformatik- und Mathematikberufe15-1252L4

name

build-compilation-dependencies

description

Build system overview for react-native-audio-api across all platforms — CMakeLists.txt, android/build.gradle, RNAudioAPI.podspec, prebuilt external libraries, and the standalone C++ test build. Use this skill when adding a new source file, modifying CMakeLists or podspec, debugging compilation errors, integrating a new dependency, or understanding why includes work differently in tests vs the app. Trigger phrases: "add source file", "CMakeLists", "podspec", "build.gradle", "prebuilt binaries", "FFmpeg disabled", "pod install", "new architecture", "compile error", "undefined symbol", "SIMD", "worklets build flag", "C++ tests", "conditional compilation", "include path", "gradle build fails", "link error".

Skill: Build, Compilation & Dependencies

For deep CMake/Gradle/podspec analysis see build-details.md.

Repository Build Overview

react-native-audio-api/
├── package.json                        # Yarn 4 workspaces root
├── packages/react-native-audio-api/    # Main library
│   ├── android/
│   │   ├── build.gradle                # Android build config (Gradle)
│   │   ├── CMakeLists.txt              # Android CMake root (delegates to subdirectory)
│   │   └── src/main/cpp/audioapi/
│   │       └── CMakeLists.txt          # Actual Android C++ build target
│   ├── common/cpp/audioapi/            # Shared C++ (used by all platforms)
│   │   └── external/                   # Prebuilt binaries per platform
│   │       ├── android/                # .a static libs (Opus, Ogg, Vorbis, OpenSSL)
│   │       ├── iphoneos/               # iOS device .a libs
│   │       ├── iphonesimulator/        # iOS sim .a libs
│   │       ├── macosx/                 # macOS .a libs
│   │       ├── ffmpeg_ios/             # FFmpeg .xcframeworks (iOS only)
│   │       ├── include/                # Headers for Opus/Ogg/Vorbis/OpenSSL
│   │       └── include_ffmpeg/         # Headers for FFmpeg
│   ├── common/cpp/test/
│   │   ├── CMakeLists.txt              # Standalone test build (no Android/iOS)
│   │   ├── RunTests.sh                 # Test runner script
│   │   └── src/                        # Google Test files
│   ├── RNAudioAPI.podspec              # CocoaPods spec for iOS
│   └── scripts/
│       ├── download-prebuilt-binaries.sh  # Downloads externals from GitHub Releases
│       ├── rnaa_utils.rb               # Ruby helpers for podspec (path resolution, worklets check)
│       └── validate-worklets-version.js
└── apps/
    └── fabric-example/
        └── ios/
            └── Podfile                 # Consumer Podfile (new arch enabled)

Prebuilt Binaries

External libraries (Opus, Ogg, Vorbis, OpenSSL, FFmpeg) are not compiled from source — they are downloaded as prebuilt .a / .so / .xcframework archives from:

https://github.com/software-mansion-labs/rn-audio-libs/releases/download/<TAG>/

Current tag: v3.0.0 (see scripts/download-prebuilt-binaries.sh).

The download script is triggered automatically:

iOS: by podspec prepare_command during pod install
Android: by downloadPrebuiltBinaries Gradle task, which runs before preBuild

Downloaded artifacts land in:

common/cpp/audioapi/external/android/<ABI>/ — .a static libs for Android ABIs
android/src/main/jniLibs/<ABI>/ — FFmpeg .so shared libs for Android (loaded at runtime)
common/cpp/audioapi/external/ffmpeg_ios/ — FFmpeg .xcframework files for iOS
common/cpp/audioapi/external/iphoneos/ / iphonesimulator/ / macosx/ — Opus/Ogg/etc .a

These directories are gitignored. If they're missing, run pod install (iOS) or Gradle build (Android) to re-download them. Do not commit them.

Android Build — high-level summary

Files

android/build.gradle — Gradle library config
android/CMakeLists.txt — Android CMake root (SIMD detection, RN version flags, delegates to subdirectory)
android/src/main/cpp/audioapi/CMakeLists.txt — actual build target (sources, prebuilt libs, include paths)

Key behaviors

Feature flags (newArchEnabled, disableAudioapiFFmpeg) are read from app's gradle.properties and forwarded to both CMake and Kotlin BuildConfig
DSP sources always compiled with -O3 regardless of overall build type
Sources gathered with GLOB_RECURSE CONFIGURE_DEPENDS — CMake re-runs automatically when files are added/removed
Worklets must be merged before the audio API CMake build starts (explicit Gradle task dependency)
16KB page size alignment enabled for Android 15+

For full per-line analysis see build-details.md.

iOS Build (CocoaPods) — high-level summary

Files

RNAudioAPI.podspec — library spec with subspecs
scripts/rnaa_utils.rb — Ruby helpers called by podspec
apps/fabric-example/ios/Podfile — consumer

Key behaviors

Four subspecs split compilation: audioapi (core C++), audioapi/ios (ObjC++), audioapi/audioapi_dsp (DSP with -O3), audioapi/miniaudio_impl (compiled as -x objective-c++)
Static prebuilt libs linked with -force_load to prevent dead-stripping
FFmpeg xcframeworks listed in s.ios.vendored_frameworks — CocoaPods handles embedding and signing
Accelerate framework linked, enabling HAVE_ACCELERATE=1 for vDSP SIMD on iOS
Header search paths split: pod_target_xcconfig (library compilation) vs xcconfig (app consumers)
rnaa_utils.rb resolves dynamic paths at pod install time (not hardcoded)

For full per-line analysis see build-details.md.

Building the Apps

iOS (fabric-example)

# From the monorepo root first:
yarn install

# Then install pods — must be done from the ios/ directory:
cd apps/fabric-example/ios
pod install

# Run the app (from repo root):
yarn workspace fabric-example ios
# or open Xcode:
open apps/fabric-example/ios/FabricExample.xcworkspace

When to re-run pod install:

After yarn install (any dependency change)
After changing RNAudioAPI.podspec
After adding/removing iOS source files that need to be picked up
After changing rnaa_utils.rb or scripts/validate-worklets-version.js
When prebuilt binaries need to be re-downloaded (podspec prepare_command runs on pod install)

Disable FFmpeg on iOS:

DISABLE_AUDIOAPI_FFMPEG=1 pod install

Android (fabric-example)

yarn workspace fabric-example android
# or open in Android Studio:
open apps/fabric-example/android

Disable FFmpeg on Android: set in android/gradle.properties:

disableAudioapiFFmpeg=true

Clean CMake cache (fixes most mysterious native build failures):

yarn workspace react-native-audio-api clean  # or manually:
rm -rf packages/react-native-audio-api/android/.cxx

C++ Tests (standalone build)

Location

packages/react-native-audio-api/common/cpp/test/

How to run

yarn test   # from monorepo root — runs RunTests.sh

RunTests.sh does:

cd packages/react-native-audio-api/common/cpp/test
cmake -S . -B build -Wno-dev
cd build && make -j10
./tests --gtest_print_time=1

The build/ directory is deleted after each run.

Key design decisions

Completely standalone — no Gradle, no Xcode, no prebuilt Android libraries needed
Sources resolved from node_modules (symlinked to packages/ in yarn workspaces)
HostObjects, worklets nodes, AudioContext, and FFmpegDecoding are excluded from the test build
Compile definitions: RN_AUDIO_API_ENABLE_WORKLETS=0, RN_AUDIO_API_TEST=1, RN_AUDIO_API_FFMPEG_DISABLED=1
Google Test auto-fetched via FetchContent if not installed locally
New test files in test/src/**/*.cpp are picked up automatically by glob — no CMakeLists edit needed

For MockAudioEventHandlerRegistry, TestableXxx pattern, and full CMakeLists analysis see build-details.md.

Conditional Compilation Flags Summary

Flag	Android (CMake)	iOS (podspec)	Tests
`RN_AUDIO_API_FFMPEG_DISABLED`	`-DRN_AUDIO_API_FFMPEG_DISABLED`	`-DRN_AUDIO_API_FFMPEG_DISABLED=1`	Always set to 1
`RN_AUDIO_API_ENABLE_WORKLETS`	`-DRN_AUDIO_API_ENABLE_WORKLETS=1/0`	`-DRN_AUDIO_API_ENABLE_WORKLETS=1`	Always set to 0
`RCT_NEW_ARCH_ENABLED`	`-DRCT_NEW_ARCH_ENABLED`	`-DRCT_NEW_ARCH_ENABLED`	Not set
`HAVE_ARM_NEON_INTRINSICS`	Set by CMake SIMD detection	Set by Xcode/Clang for arm64	Set by CMake SIMD detection
`HAVE_X86_SSE2`	Set by CMake SIMD detection	Not used	Set by CMake SIMD detection
`HAVE_ACCELERATE`	Not set	`GCC_PREPROCESSOR_DEFINITIONS`	Not set
`RN_AUDIO_API_TEST`	Not set	Not set	Always set to 1

Common Build Failure Patterns

Symptom	Likely cause	Fix
`file not found: libopus.a`	Prebuilt binaries not downloaded	Run `pod install` (iOS) or Gradle build (triggers download task)
`No such module 'RNAudioAPI'`	Pod not installed	`cd apps/fabric-example/ios && pod install`
`undefined symbol: av_*`	FFmpeg .so not in jniLibs	Build triggers download; verify `disableAudioapiFFmpeg` not set unexpectedly
CMake error on clean build	Stale `.cxx` cache	`rm -rf packages/react-native-audio-api/android/.cxx`
Test build: `Cannot open include file: audioapi/...`	Node modules not linked	`yarn install` from root, then re-run tests
New `.cpp` not compiled in tests	Glob picks it up automatically — may need cmake reconfigure	Delete `test/build/` and re-run
iOS compile error `unknown type 'id'`	C++ file included ObjC-only header	Compile that file as ObjC++ (separate subspec with `-x objective-c++`)
`RCT_NEW_ARCH_ENABLED` undefined on Android	Old RN gradle plugin	Ensure `newArchEnabled=true` in app's `gradle.properties`

Maintenance: see maintenance.md.

build-compilation-dependencies

Mehr aus diesem Repository

Mehr aus diesem Repository

Skill: Build, Compilation & Dependencies

Repository Build Overview

Prebuilt Binaries

Android Build — high-level summary

Files

Key behaviors

iOS Build (CocoaPods) — high-level summary

Files

Key behaviors

Building the Apps

iOS (fabric-example)

Android (fabric-example)

C++ Tests (standalone build)

Location

How to run

Key design decisions

Conditional Compilation Flags Summary

Common Build Failure Patterns

Skill: Build, Compilation & Dependencies

Repository Build Overview

Prebuilt Binaries

Android Build — high-level summary

Files

Key behaviors

iOS Build (CocoaPods) — high-level summary

Files

Key behaviors

Building the Apps

iOS (fabric-example)

Android (fabric-example)

C++ Tests (standalone build)

Location

How to run

Key design decisions

Conditional Compilation Flags Summary

Common Build Failure Patterns