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Example of iOS application managing media devices

This example allows to publish WebRTC stream on Web Call Server and demonstrates selection of source camera and specification of the following parameters for published and played video

  • resolution (width, height)
  • bitrate
  • FPS (Frames Per Second) - for published video
  • quality - for played video

As well as publishing streams with audio and video, it allows to publish audio-only and video-only streams.
Audio and video can be muted when publishing is started (if corresponding controls has been set to ON before streaming was started), or while stream is being published.
Video streams can be played with or without video.

On the screenshot below the example is displayed when a stream is being published and played.
In the URL specified in the input field, demo.flashphoner.com is the address of the WCS server.

Two videos are displayed

  • left - video from the camera
  • right - the published video stream is played from the server


View with controls for publishing settings is displayed when 'Local settings' button is tapped

and view with controls for playback settings - when 'Remote settings' button is tapped.

Work with code of the example

To analyze the code, let's take MediaDevices example, which can be downloaded from GitHub.

View classes

1. Import of API. code

import FPWCSApi2Swift


2. List available media devices.

WCSApi2.getMediaDevices code

localDevices = WCSApi2.getMediaDevices()


3. Default microphone and camera selection

FPWCSApi2MediaDeviceList.audio FPWCSApi2MediaDeviceList.video code

        if (localDevices?.audio?.count ?? 0 > 0) {
            microphone.text = (localDevices?.audio[0] as AnyObject).label
        }
        if (localDevices?.video?.count ?? 0 > 0) {
            camera.text = (localDevices?.video[0] as AnyObject).label
        }


4. Constraints for published stream.

FPWCSApi2AudioConstraints, FPWCSApi2AudioConstraints code

    func toMediaConstraints() -> FPWCSApi2MediaConstraints {
        let ret = FPWCSApi2MediaConstraints()
        if (self.audioSend.isOn) {
            let audio = FPWCSApi2AudioConstraints()
            audio.useFEC = audioFEC.isOn
            audio.useStereo = audioStereo.isOn
            audio.bitrate = Int(audioBitrate.text ?? "0") ?? 0
            ret.audio = audio
        }
        if (self.videoSend.isOn) {
            let video = FPWCSApi2VideoConstraints()
            for device in localDevices!.video {
                if ((device as AnyObject).label == camera.text) {
                    video.deviceID = (device as AnyObject).deviceID;
                }
            }
            video.minWidth = Int(videoWidth.text ?? "0") ?? 0
            video.maxWidth = video.minWidth
            video.minHeight = Int(videoHeight.text ?? "0") ?? 0
            video.maxHeight = video.minHeight
            video.minFrameRate = Int(videoFPS.text ?? "0") ?? 0
            video.maxFrameRate = video.minFrameRate
            video.bitrate = Int(videoBitrate.text ?? "0") ?? 0
            ret.video = video;
        }
        return ret;
    }


5. Constraints for played stream.

FPWCSApi2AudioConstraints, FPWCSApi2AudioConstraints  code

    func toMediaConstraints() -> FPWCSApi2MediaConstraints {
        let ret = FPWCSApi2MediaConstraints();
        ret.audio = FPWCSApi2AudioConstraints();
        if (playVideo.isOn) {
            let video = FPWCSApi2VideoConstraints();
            video.minWidth = Int(videoWidth.text ?? "0") ?? 0
            video.maxWidth = video.minWidth
            video.minHeight = Int(videoHeight.text ?? "0") ?? 0
            video.maxHeight = video.minWidth
            video.bitrate = Int(videoBitrate.text ?? "0") ?? 0
            video.quality = Int(videoQuality.text ?? "0") ?? 0
            ret.video = video;
        }
        return ret;
    }


6. Local camera and microphone testing

WCSApi2.getMediaAccess  code

    @IBAction func testPressed(_ sender: Any) {
        if (testButton.title(for: .normal) == "TEST") {
            let constraints = FPWCSApi2MediaConstraints(audio: true, video: true)!
            do {
                try WCSApi2.getMediaAccess(constraints, localDisplay.videoView)
            } catch {
                print(error)
            }
            testButton.setTitle("RELEASE", for: .normal)
        } else {
            WCSApi2.releaseLocalMedia(display: localDisplay.videoView);
            testButton.setTitle("TEST", for: .normal)
        }
    }


7. Session creation and connection to the server.

WCSSession, WCSSession.connect  code

The options include:

  • URL of WCS server
  • appKey of internal server-side application (defaultApp)
    @IBAction func connectPressed(_ sender: Any) {
        changeViewState(connectButton, false)
        if (connectButton.title(for: .normal) == "CONNECT") {
            if (session == nil) {
                let options = FPWCSApi2SessionOptions()
                options.urlServer = urlField.text
                options.appKey = "defaultApp"
                do {
                session = try WCSSession(options)
                } catch {
                    print(error);
                }
            }
            ...
            changeViewState(urlField, false)
            session?.connect()
        }
    }


8. Stream publishing.

WCSSession.createStream, WCSStream.publish  code

Object with the following stream options is passed to createStream method:

  • stream name
  • view to display video
  • video constraints
    @IBAction func publishPressed(_ sender: Any) {
        changeViewState(publishButton,false)
        if (publishButton.title(for: .normal) == "PUBLISH") {
            let options = FPWCSApi2StreamOptions()
            options.name = publishName.text
            options.display = localDisplay.videoView
            options.constraints = localMediaConstrains;
            do {
                try publishStream = session!.createStream(options)
            } catch {
                print(error);
            }
            ...
            do {
                try publishStream?.publish()
            } catch {
                print(error);
            }
        }        
    }


9. Preview stream playback

WCSSession.createStream, WCSStream.play  code

Object with the following stream options is passed to createStream method:

  • stream name
  • view to display video
  • video constraints
    @IBAction func playPressed(_ sender: Any) {
        changeViewState(playButton,false)
        if (playButton.title(for: .normal) == "PLAY") {
            let options = FPWCSApi2StreamOptions()
            options.name = playName.text;
            options.display = remoteDisplay.videoView;
            options.constraints = remoteMediaConstrains;
            do {
            playStream = try session!.createStream(options)
            } catch {
                print(error);
            }
            ...
            do {
                try playStream?.play()
            } catch {
                print(error);
            }
        }
    }


10. Stream playback stop.

WCSStream.stop  code

    @IBAction func playPressed(_ sender: Any) {
        changeViewState(playButton,false)
        if (playButton.title(for: .normal) == "PLAY") {
            ...
        } else{
            do {
                try playStream?.stop();
            } catch {
                print(error);
            }
        }
    }


11. Stream publishing stop.

WCSStream.stop  code

    @IBAction func publishPressed(_ sender: Any) {
        changeViewState(publishButton,false)
        if (publishButton.title(for: .normal) == "PUBLISH") {
            ...
        } else {
            do {
                try publishStream?.stop();
            } catch {
                print(error);
            }
        }
        
    }
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