Table of Contents

Overview

The player example shows how to convert stream published on WCS server to HLS and play it in browser supporting HLS playback natively, on video tag level. HLS stream cut starts automatically when strea stream is requested by HLS URL, for example example `https://demotest1.flashphoner.com:8445/test/test.m3u8` on the screenshot belowImage Removed

Image Added

Since build 2.0.244, the example supports the following parameters:

src - stream full HLS URL to play, should be encoded with URI, for example https%3A%2F%2Ftest1.flashphoner.com%3A8445%2Ftest%2Ftest.m3u8
autoplay - automatically play the HLS URL, in this case all the input fields and buttons are hidden: false (by default) or true

The player URL example with parameters as displayed on the screenshot above (the link is available in Permalink field)

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https://test1.flashphoner.com:8444/client2/examples/demo/streaming/hls-native/hls-native.html?src=https%3A%2F%2Ftest1.flashphoner.com%3A8445%2Ftest%2Ftest.m3u8

The player URL example with autoplay enabled

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https://test1.flashphoner.com:8444/client2/examples/demo/streaming/hls-native/hls-native.html?src=https%3A%2F%2Ftest1.flashphoner.com%3A8445%2Ftest%2Ftest.m3u8&autoplay=true

In this case the stream should be played automatically with audio muted. A viewer should use a loud slider in the player interface to unmute audio.

The code of the example

The source code can be accessed on server by the following path:

/usr/local/FlashphonerWebCallServer/client2/examples/demo/streaming/hls-js-playernative

hls-native.css - player page styles file
hls-native.html - player page
hls-native.js - player lauhcn launch script
../hls-player/player-page.html - common player page elements for three HLS playback examples

The example can be tested using the fiollowing URL:

...

Where host is WCS server address

Analyzing the code

To analize analyze the code get hls-native.js file version with hash ecbadc3 1703e13 which is available here and and can be downloaded in build 2.0.212244.

1. A server HLS URL detectiongetHLSUrl() Loading the player page

code

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function initPageconst loadPlayerPage = function() {
    $loadPage("#header").text("HLS Native Player Minimal");
    $("#urlServer").val(getHLSUrl());
    ...
}

2. div element setup to pass to the player

code

...

../hls-player/player-page.html", "playerPage", initPage );
}

2. The player HTML page initializing

code

If browser does not support HLS native playback, player will not be initialized and a warning will be displayed

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const initPage = function initPage(() {
    if (playSrc) {
        setValue("fullLink", decodeURIComponent(playSrc));
    } else if (autoplay) {
    ...    console.warn("No HLS URL set, autoplay disabled");
        autoplay = false;
    }
    remoteVideo = document.getElementById('remoteVideo');
    remoteVideo.style ="background-color: lightgrey;";
}

3. Stream name detection (the stream should be published to server)

...

if (remoteVideo.canPlayType('application/vnd.apple.mpegurl') && Browser.isSafariWebRTC()) {
        console.log("Using Native HLS player");
        if (autoplay) {
            // There should not be any visible item on the page unless player
            hideAllToAutoplay();
            // The player should use all available page width
            setUpPlayerItem(true);
            // The player should be muted to automatically start playback
            initVideoPlayer(remoteVideo, true);
            playBtnClick();
        } else {
            setText("header", "HLS Native Player Minimal");
            displayCommonItems();
            setUpButtons();
            enablePlaybackStats();
            // The player should have a maximum fixed size
            setUpPlayerItem(false);
            // The player can be unmuted because user should click Play button
            initVideoPlayer(remoteVideo, false);
        }
    } else {
        setText("notifyFlash", "Your browser doesn't support native HLS playback");
        disableItem("applyBtn");
        toggleInputs(false);
    }
}

3. Video tag initializing to play

code

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const initVideoPlayer = function(video, playBtnClick(muted) {
    if (validateForm()video) {
        var streamName = $('#playStream').val();
video.style.backgroundColor = "black";
        video.muted = muted;
        if (Browser.isiOS()) {
            // iOS hack when using standard controls to leave fullscreen mode
         streamName  = encodeURIComponentsetWebkitFullscreenHandlers(streamNamevideo);
        ...}
    }
}

4. HLS HLS stream URL forming

code

If authentication key and token are set, they will be included to stream URL

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function playBtnClick(const getVideoSrc = function(src) {
    let videoSrc = src;
    if (validateForm()) {
        let streamName  ...= getValue('playStream');
        varstreamName = encodeURIComponent(streamName);
        videoSrc = $getValue("#urlServerurlServer").val() + '/' + streamName + '/' + streamName + '.m3u8';
        varlet key = $getValue('#keykey').val();
        varlet token = $getValue("#tokentoken").val();
        if (key.length > 0 && token.length > 0) {
            videoSrc += "?" + key + "=" + token;
        }
    }
    ...
setValue("fullLink", videoSrc);
    return }videoSrc;
}

5. Player startinglaunching

code

If browser does not support HLS playback natively, player will not be launched and a warning will be displayed

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functionconst playBtnClick = function() {
    iflet videoSrc = getVideoSrc(validateFormgetValue("fullLink"));
    if (videoSrc) {
        remoteVideo.onloadedmetadata = () => {
            console.log("Play native HLS");
            remoteVideo.play();
         if   onStarted(remoteVideo.canPlayType('application/vnd.apple.mpegurl')));
        };
        remoteVideo.onplaying = () => {
            remoteVideo.src = videoSrcconsole.log("playing event fired");
            displayPermalink(videoSrc);
        };
    remoteVideo.addEventListener('loadedmetadata',    remoteVideo.src = videoSrc;
    }
}

6. Playback stopping

code

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const stopBtnClick = function() {
    if (remoteVideo != null) {
        console.log("PlayStop nativeHTML5 HLSplayer");
        remoteVideo.pause();
        remoteVideo.play();currentTime = 0;
        remoteVideo.removeAttribute('src');
        remoteVideo.load();
    }
    onStopped();
}

7. Getting an available playback statistics from HTML5 video tag

HTML5Stats code

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const PlaybackStats = function(interval) {
    const playbackStats = {
        interval: interval || STATS_INTERVAL,
        timer: null,
       onStarted stats: null,
        start: function() {
            let video = remoteVideo;

            playbackStats.stop();
            }stats = HTML5Stats(video);
            playbackStats.timer =  }setInterval(playbackStats.displayStats, playbackStats.interval);
        else {    setText("videoWidth", "N/A");
            $setText("#notifyFlash").text("Your browser doesn't support native HLS playback");
"videoHeight", "N/A");
            setText("videoRate", "N/A");
            setText("videoFps", "N/A");
            }
showItem("stats");
        }
}

6. Playback stopping

code

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function stopBtnClick(,
        stop: function() {
            if (playbackStats.timer) {
    if (remoteVideo != null) {
            clearInterval(playbackStats.timer);
                playbackStats.timer = null;
            }
            playbackStats.stats = null;
            hideItem("stats");
        },
        displayStats: function() {
         console.log("Stop HTML5 player"   if (stats.collect()) {
                let width = stats.getWidth();
        remoteVideo.pause        let height = stats.getHeight();
                remoteVideo.currentTime = 0;
let bitrate = stats.getBitrate();
                let fps = stats.getFps();

                setText("videoWidth", width);
         remoteVideo.removeAttribute('src');
       setText("videoHeight", height);

                if (bitrate !== undefined) {
                   remoteVideo.load( setText("videoRate", Math.round(bitrate));
                }
    onStopped()            if (fps !== undefined) {
                    setText("videoFps", fps.toFixed(1));
                }
            }
        }
    };
    return playbackStats;
}

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