Cabbage 一个基于AVFoundation的视频编辑框架，使用简单，易于扩展

Cabbage 一个基于AVFoundation的视频编辑框架，使用简单，易于扩展

中文说明 中文使用文档

A high-level video composition framework build on top of AVFoundation. It's simple to use and easy to extend. Use it and make life easier if you are implementing video composition feature.

This project has a Timeline concept. Any resource can put into Timeline. A resource can be Image, Video, Audio, Gif and so on.

Features

Build result content objcet with only few step.

Create resourceSet configurationPut them into TimelineUse Timeline to generate AVPlayerItem/AVAssetImageGenerator/AVExportSession

Resouce: Support video, audio, and image. Resource is extendable, you can create your customized resource type. e.g gif image resourceVideo configuration support: transform, opacity and so on. The configuration is extendable.Audio configuration support: change volume or process with audio raw data in real time. The configuration is extendable.Transition: Clips may transition with previous and next clip

Usage

Below is the simplest example. Create a resource from AVAsset, set the video frame's scale mode to aspect fill, then insert trackItem to timeline, after all use CompositionGenerator to build AVAssetExportSession/AVAssetImageGenerator/AVPlayerItem.

// 1. Create a resourcelet asset: AVAsset = ... let resource = AVAssetTrackResource(asset: asset)// 2. Create a TrackItem instance, TrackItem can configure video&audio configurationlet trackItem = TrackItem(resource: resource)// Set the video scale mode on canvastrackItem.configuration.videoConfiguration.baseContentMode = .aspectFill// 3. Add TrackItem to timelinelet timeline = Timeline()timeline.videoChannel = [trackItem]timeline.audioChannel = [trackItem]// 4. Use CompositionGenerator to create AVAssetExportSession/AVAssetImageGenerator/AVPlayerItemlet compositionGenerator = CompositionGenerator(timeline: timeline)// Set the video canvas's sizecompositionGenerator.renderSize = CGSize(width: 1920, height: 1080)let exportSession = compositionGenerator.buildExportSession(presetName: AVAssetExportPresetMediumQuality)let playerItem = compositionGenerator.buildPlayerItem()let imageGenerator = compositionGenerator.buildImageGenerator()

Basic Concept

Timeline

Use to construct resource, the developer is responsible for putting resources at the right time range.

CompositionGenerator

Use CompositionGenerator to create AVAssetExportSession/AVAssetImageGenerator/AVPlayerItem

CompositionGenerator use Timeline instance translate to AVFoundation API.

Resource

Resource provider Image or/and audio data. It also provide time infomation about the data.

Currently support

Image type: ImageResource: Provide a CIImage as video framePHAssetImageResource: Provide a PHAsset, load CIImage as video frameAVAssetReaderImageResource: Provide AVAsset, reader samplebuffer as video frame using AVAssetReaderAVAssetReverseImageResource: Provide AVAsset, reader samplebuffer as video frame using AVAssetReader, but reverse the order Video&Audio type: AVAssetTrackResource: Provide AVAsset, use AVAssetTrack as video frame and audio frame.PHAssetTrackResource: Provide PHAsset, load AVAsset from it.

TrackItem

A TrackItem contains Resource, VideoConfiguration and AudioConfiguration.

Currently support

Video Configuration baseContentMode, video frame's scale mode base on canvas sizetransformopacityconfigurations, custom filter can be added here. Audio Configuration volumenodes, apply custom audio process operation, e.g VolumeAudioConfiguration videoTransition, audioTransition

Advance usage

Custom Resource

You can provide custom resource type by subclass Resource, and implement func tracks(for type: AVMediaType) -> [AVAssetTrack].

By subclass ImageResource, you can use CIImage as video frame.

Custom Image Filter

Image filter need Implement VideoConfigurationProtocol protocol, then it can be added to TrackItem.configuration.videoConfiguration.configurations

KeyframeVideoConfiguration is a concrete class.

Custom Audio Mixer

Audio Mixer need implement AudioConfigurationProtocol protocol, then it can be added to TrackItem.configuration.audioConfiguration.nodes

VolumeAudioConfiguration is a concrete class.

Why I create this project

AVFoundation aready provide powerful composition API for video and audio, but these API are far away from easy to use.

1.AVComposition

We need to know how and when to connect different tracks. Say we save the time range info for a track, finnaly we will realize the time range info is very easy to broken, consider below scenarios

Change previous track's time range infoChange speedAdd new trackAdd/remove transition

These operations will affect the timeline and all tracks' time range info need to be updated.

Bad thing is that AVComposition only supports video track and audio track. If we want to combine photo and video, it's very difficult to implement.

2.AVVideoCompostion

Use AVVideoCompositionInstruction to construct timeline, use AVVideoCompositionLayerInstruction to configure track's transform. If we want to operate raw video frame data, need implement AVVideoCompositing protocol.

After I write the code, I realized there are many codes unrelated to business logic, they should be encapsulated.

3.Difffcult to extend features

AVFoundation only supports a few basic composition features. As far as I know, it only can change video frame transform and audio volume. If a developer wants to implement other features, e.g apply a filter to a video frame, then need to rewrite AVVideoCompostion's AVVideoCompositing protocol. The workload suddenly become very large.

Life is hard why should I write hard code too? So I create Cabbage, easy to understand API, flexible feature scalability.

Installation

Cocoapods

platform :ios, '9.0'use_frameworks!target 'MyApp' do # your other pod # ... pod 'VFCabbage'end

Manually

It is not recommended to install the framework manually, but if you have to do it manually. You can

simplely drag Cabbage/Sources folder to you project.Or add Cabbage as a submodule.

$ git submodule add https://github.com/VideoFlint/Cabbage.git

Requirements

iOS 9.0+Swift 4.x

Projects using Cabbage

VideoCat: A demo project demonstrates how to use Cabbage.

LICENSE

Under MIT

Special Thanks

Icon designed by 熊猫先生

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