MasterCamera

A professional Android video recording library with real-time camera effects, filters, beauty processing, and face detection.

Features

• Camera Control - Supports both Camera API 1 and Camera API 2 with front/back switching, auto-focus, flash, zoom, and exposure control
• Video Recording - H.264 hardware-accelerated encoding via MediaCodec with configurable bitrate, frame rate, and resolution
• Playback Speed - 5 speed modes: 0.25x, 0.5x, 1.0x, 2.0x, 4.0x
• Filters - 40+ LUT-based color filters (polaroid, mocha, japanese, black & white, etc.)
• Effects/Stickers - 25+ real-time effects including stickers, split screen, blur, soul scale, shake, and more
• Beauty Filter - Real-time skin smoothing with adjustable intensity (0-100)
• Face Detection - Powered by Alibaba MNN Kit with up to 20 simultaneous faces, facial landmarks, head pose estimation, and face action detection
• Background Music - Silent music mixing directly into recorded video (no speaker output)
• OpenGL Rendering - GPU-accelerated frame processing via OpenGL ES 2.0/3.0

Filter Gallery

40+ built-in LUT filters available out of the box:

Polaroid	Japanese	Snow	Black
Mocha	Amber	Cool	Unicorn

All available filters

fair, snow, teanash, mocha, ubonto, city, caramel, natural, tender, japanese, mousse, past, azure, orangecool, begin, milk, grapefruit, refreshing, moving, teen, cheese, islands, sober, rose, danse, miscellaneous, amazing, polaroid, red, amber, firstlove, honey, cool, romeo, yogurt, peilan, tasty, delicious, contrast, dawn, unicorn, black, cookies, pure, begonia, innocence, years

Architecture

graph TD
    A[Android UI Layer<br/>Kotlin] --> B[MasterCamera Library<br/>Kotlin + JNI]
    B --> C[Native Engine<br/>C++ / OpenGL ES]
    C --> D[FFmpeg / x264 / FDK-AAC]

    subgraph Recording Pipeline
        E[Camera] -->|frames| F[OpenGL Render]
        F -->|+ filters/effects| G[H.264 Encode]
        H[Microphone] -->|PCM| I[Audio Mix]
        J[Music File] -->|decode| I
        I -->|AAC| K[MP4 Muxer]
        G --> K
    end

Loading

app/                   # Demo application
MasterCamera/          # Core camera library (Android Library module)
  src/main/java/       #   Kotlin source code
  src/main/cpp/        #   Native C++ (OpenGL rendering, encoding, decoding)
extra/                 # Pre-built native libraries (FFmpeg, x264, FDK-AAC, libpng, GLM)

Tech Stack

Component	Version
Android Gradle Plugin	8.5.2
Gradle	8.7
Kotlin	1.9.24
Compile SDK	35 (Android 15)
Min SDK	24 (Android 7.0)
Target SDK	35
NDK	20.1.5948944
CMake	3.22.1
Java	17

Native Libraries

Library	Purpose
FFmpeg	Audio/video encoding, decoding, muxing
x264	H.264 video encoder
FDK-AAC	AAC audio encoder
libpng	PNG image loading
GLM	OpenGL mathematics
MNN Kit	Face detection and tracking

Preview Resolutions

• 1920 x 1080
• 1280 x 720
• 960 x 540
• 720 x 720

Build

./gradlew assembleDebug

Requires JDK 17 and Android SDK with the NDK installed.

License

All rights reserved.