[webRTC for ios vol1] iOS用のframeworkのビルド

webRTCをiosようにビルドしてwebRTC.framework を作る。
ググるとちょいちょい情報はありますが、変更があったりするので、2017/04/02 現在のものを整理。

実際につなげてみる Vol2 はこちら
http://qiita.com/nakadoribooks/items/9f1b1cbe32f2fc6dec70

成果物

参考

• http://www.utali.io/entry/2016/09/07/142102
• http://mike-neko.github.io/blog/webrtc-build/

webRTC.framework を作る

適当なフォルダを作って移動

mkdir webrtc-build
cd webrtc-build

Install depot_tools

git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
export PATH=`pwd`/depot_tools:"$PATH"

WebRTCのソースコードをダウンロード

fetch --nohooks webrtc_ios
gclient sync

src ディレクトリができるので、移動してコミットを確認

cd src
git log

--
commit 76d9c9c3826f3c3622d3e8869fa54f7b39e70427
Author: stefan <[e-mail]>
Date:   Sat Apr 1 06:51:09 2017 -0700

てことで
76d9c9c3826f3c3622d3e8869fa54f7b39e70427
これでやります

とりあえずブランチを切っとく

git checkout -b nakadoribooks-build

gn gen する

build の設定てきなやつ？

とりあえず64用と32用の二つ。
シュミレーター用も必要であれば target_cpuを変えてやる

target_os:
To build for iOS this should be set as target_os="ios" in your gn args. The default is whatever OS you are running the script on, so this can be omitted when generating build files for macOS.
target_cpu:
For builds targeting iOS devices, this should be set to either "arm" or "arm64", depending on the architecture of the device. For builds to run in the simulator, this should be set to "x64".
is_debug:
Debug builds are the default. When building for release, specify false.
https://webrtc.org/native-code/ios/

gn gen out/ios_64 --args='target_os="ios" target_cpu="arm64" is_debug=false ios_enable_code_signing=false'
gn gen out/ios_32 --args='target_os="ios" target_cpu="arm" is_debug=false ios_enable_code_signing=false'

ninja する

build

ninja -C out/ios_64 AppRTCMobile
ninja -C out/ios_32 AppRTCMobile

64用と32用をくっつける

フォルダを作る

mkdir out/ios

コピーする

cp -R out/ios_64/WebRTC.framework/ out/ios/WebRTC.framework

がっちゃんこする

lipo -create out/ios_64/WebRTC.framework/WebRTC out/ios_32/WebRTC.framework/WebRTC -output out/ios/WebRTC.framework/WebRTC

なぜか "RTCVideoCapturer.h" だけ入ってないのでコピーする

cp webrtc/sdk/objc/Framework/Headers/WebRTC/RTCVideoCapturer.h out/ios/WebRTC.framework/Headers/

できました。
out/ios/WebRTC.framework
こいつです。

xcodeのプロジェクトに入れて使ってみる

プロジェクトに追加

↑ でつくった WebRTC.framework をxcodeにドラッグアンドドロップして
"Embed Binaries"に追加

設定の追加

Enable bitcode を NO

Info.plist に Privacy - Camera Usage Description を追加

コードを書く

webRTC の部分

WebRTC.swift

import UIKit

class WebRTC: NSObject {

    private let factory = RTCPeerConnectionFactory()
    private var localRenderView = RTCEAGLVideoView()
    private var localStream:RTCMediaStream?
    private let _localView = UIView(frame:CGRect(x:20, y:40, width:140, height:200))
    
    static let sharedInstance = WebRTC()
    
    private override init() {
        super.init()
    }
    
    // MARK: public
    
    func localView()->UIView{
        return _localView
    }
    
    func setup(){
        print("setup")
        
        setupLocalStream()
    }
    
    // MARK: private
    
    private func setupLocalStream(){
        
        let streamId = WebRTCUtil.idWithPrefix(prefix: "stream")
        localStream = factory.mediaStream(withStreamId: streamId)
        setupLocalVideoTrack()
    }
    
    private func setupLocalVideoTrack(){
        localRenderView.frame.size = _localView.frame.size
        _localView.addSubview(localRenderView)
        
        let localVideoSource = factory.avFoundationVideoSource(with: WebRTCUtil.mediaStreamConstraints())
        let localVideoTrack = factory.videoTrack(with: localVideoSource, trackId: WebRTCUtil.idWithPrefix(prefix: "video"))
        
        localVideoTrack.add(localRenderView)
        
        localStream?.addVideoTrack(localVideoTrack)
    }
    
}

WebRTCUtil.swift

import UIKit

class WebRTCUtil: NSObject {

    static func idWithPrefix(prefix:String)->String{
        return "\(prefix)_\(randomStringWithLength(len: 20))"
    }
    
    static func randomStringWithLength (len : Int) -> NSString {
        let letters : NSString = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
        let randomString : NSMutableString = NSMutableString(capacity: len)
        
        for _ in 0..<len {
            let length = UInt32 (letters.length)
            let rand = arc4random_uniform(length)
            randomString.appendFormat("%C", letters.character(at: Int(rand)))
        }
        
        return randomString
    }
    
    static func mediaStreamConstraints()->RTCMediaConstraints{
        return RTCMediaConstraints(mandatoryConstraints: nil, optionalConstraints: nil)
    }
}

画面

ViewController.swift

import UIKit

class ViewController: UIViewController {

    private let webRTC = WebRTC.sharedInstance
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        webRTC.setup()
        view.addSubview(webRTC.localView())
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

以上。