Third-party components and resources

• TDLib: used for interacting with Telegram API and caching data

• LevelDB: used for storing local data and settings

• libtgvoip & java layer by the same author: used for VoIP

• rlottie: fork of Samsung library, used for animated stickers

• lz4: used for storing cached frames of animated stickers

• WebP: used for showing static stickers on Android versions below 4.4

• ExoPlayer: used for audio and video playback on supported devices

• libvpx: vp9 ExoPlayer extension

• flac: flac ExoPlayer extension

• ffmpeg: used for GIF playback & ffmpeg ExoPlayer extension

• libyuv: used to convert pixel format while decoding GIFs

• opus: used for voice messages

• opusfile

• ogg

• AndroidX: various basic Android stuff + CameraX

• Play Core: used for in-app update system

• Google Play Services: maps and location services

• Firebase Messaging: notifications

• YouTube: YouTube player API

• Transcoder: used to compress video files

• ShortcutBadger: used to show badge near app shortcut

• ReLinker: used to properly load native shared libraries

• Konfetti: confetti animation

• ZXing: QR scanning on devices where Google Play Services are not available

• Google's Material Icons: most of application icons

• Material Design Icons: various icons by Austin Andrews, Yasmina Lembachar, Haley Halcyon, Michael Richins

• Klaxon: JSON parser used in build scripts

• Diff-Match-Patch: source code

• RTL View Pager: source code

• svg-android: source code