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losslesscut-android

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LosslessCut is an editor Android app that cuts video and audio losslessly.

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# LosslessCut (MP4)

[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
[![API](https://img.shields.io/badge/API-26%2B-brightgreen.svg?style=flat)](https://android-arsenal.com/api?level=26)

**LosslessCut (MP4)** is a high-performance, open-source Android application for **instant, lossless media trimming and merging**. By manipulating compatible codecs (**H.264, H.265, AAC**) directly, it preserves original quality and processes files at lightning speed, remuxing them into standard `.mp4` and `.m4a` containers without re-encoding.

## ✨ Key Feature Pillars

### ⚡ Zero-Loss Direct Bitstream Engine
- 🚀 **Direct Muxing**: Trims and merges video (`.mp4`) and audio (`.m4a`) using native `MediaExtractor` and `MediaMuxer` with zero transcoding.
- 📦 **Batch Export & Merge**: Export multiple "KEEP" regions as individual clips or merge them into a single seamless file in one pass.
- 🎼 **Smart Audio Extraction**: Automatically routes audio-only exports to lossless `.m4a` files in the `Music` folder.
- 🔄 **Remux & Quick Fix**: Container switching (MKV to MP4) and instantaneous orientation/rotation flag repairs.

### 🎞️ Pro NLE Timeline & Ergonomics
- 🔍 **Precision Timeline**: Zoom up to 20x for frame-accurate edits with mandatory keyframe snapping and haptic feedback.
- 👆 **Anchored Actions**: Long-press inside a segment to split or delete at the touch location; non-destructive Undo/Redo history stack.
- 📱 **Adaptive Layout**: Responsive landscape sidebar, floating player overlay, and audio waveform display.
- ♿ **Accessibility First**: Full screen-reader support via `ExploreByTouchHelper` virtual view hierarchies.

### 🤖 Smart Cut (v2.0) Automated Detection
- 🔇 **Silence Cut**: Automated detection and removal of quiet sections with interactive ghost state preview and incremental +/- step slider controls.
- 👁️ **Visual Detection**: pHash, SAD luminance delta, and contrast-normalized Laplacian variance for Scene, Black, Freeze, and Blur detection.
- 🔀 **Invert Keep/Discard**: Instantly toggle between removing or preserving detected ranges.

### 🔒 Privacy, SAF & Performance Cache
- 📂 **Scoped Storage**: Storage Access Framework (SAF) tree output and MediaStore integration with zero unnecessary permissions.
- ⚡ **Analysis Cache**: App-private LRU cache for waveforms and visual analysis with configurable size caps and retention age.
- 🛡️ **100% Offline**: Zero analytics, zero data collection, zero network permissions.

## 📸 Screenshots

## 🛠️ How it Works

Unlike traditional video editors that decode and re-encode every frame, LosslessCut operates at the **container level**:

1. **Probe**: Scans file bitstreams to extract stream metadata, tracks, and sync keyframes.
2. **Visualize**: Renders a zoomable NLE timeline where keyframes act as mandatory snapping boundaries.
3. **Mux**: Writes original encoded sample buffers directly to the target output container.

## 🚀 Getting Started

### Prerequisites
- **JDK 17 or 21**
- **Android SDK 36** (Target) / **26** (Min)
- **AGP 9.0+ / Gradle 9.2+**

### Development & Build
```bash
# Clone the repository
git clone https://github.com/tazztone/losslesscut-android.git
cd losslesscut-android

# Build debug APK
./gradlew assembleDebug

# Deploy and launch on connected device
./scripts/dev-scripts/adb-run-app.sh
```

### Downloads

Prebuilt APK and AAB artifacts are published with tagged releases on
[GitHub Releases](https://github.com/tazztone/losslesscut-android/releases/latest).

## 🤝 Contributing

We follow **MVVM + Clean Architecture** with strict layer separation between UI, Domain, and Data modules.

- **Multi-Module**: Core logic belongs in `:core:domain`, `:core:data`, or `:engine`.
- **Use Cases**: All business logic MUST reside in Use Cases within `:core:domain`.
- **Verification**: Run `./scripts/dev-scripts/project-verify.sh` before submitting PRs.

## 🛡️ Security Policy

If you discover a security vulnerability, please report it privately to the maintainers rather than opening a public issue.

## 🗺️ Roadmap

- [x] **Smart Cut (v2.0)**: Integrated visual detection (Scene, Black, Freeze, Blur) with Silence Cut.
- [x] **Architectural Enforcement**: Konsist tests safeguarding module boundaries.
- [x] **Domain Purification**: Standard pure JVM domain module (`:core:domain`).
- [x] **Modern Build**: Full migration to Gradle Kotlin DSL and AGP 9.0.
- [ ] **Advanced Tags**: Title, artist, and creation date editing.

## 📚 Documentation Index

For detailed technical specifications, architecture blueprints, domain model glossaries, and developer workflows:

- 🏗️ **[Architecture & Technical Reference](docs/architecture.md)**: System architecture, multi-module structure, component blueprints, reactive state flow, risk tiers, and format matrix.
- 📖 **[Domain Model & Glossary](CONTEXT.md)**: Ubiquitous domain language, aggregate boundaries (`EditingSession`), and smart cut entities.
- 🛠️ **[Contributing Guide](CONTRIBUTING.md)**: Development setup, script automation suite, and CI verification pipeline.
- ⚙️ **[Build Tooling Matrix](docs/build-tooling.md)**: Toolchain versions (AGP, Gradle, Kotlin, KSP), flags, and modernization roadmap.
- 🔒 **[Privacy Policy](docs/privacy.html)**: Storage Access Framework (SAF) privacy model.

## 📄 License
Licensed under the **MIT License**. See [LICENSE](LICENSE) for details.

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