demos/gif-recorder.html

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> Muaz Khan     - https://github.com/muaz-khan
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> gif-recorder.html
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<head>
    <title>WebRTC Gif Recording using MediaStreamRecorder</title>

    <script src="https://cdn.WebRTC-Experiment.com/MediaStreamRecorder.js"></script>
    <script src="https://cdn.webrtc-experiment.com/gif-recorder.js"></script>
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<body>
    <article>
        <header style="text-align: center;">
            <h1>
                    <a href="https://www.webrtc-experiment.com/">WebRTC</a> Gif Recording using <a href="https://github.com/streamproc/MediaStreamRecorder" target="_blank">MediaStreamRecorder</a>
                </h1>
            <p>
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                <a href="http://www.MuazKhan.com/" target="_blank">Muaz Khan</a> .
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        </header>

        <div class="github-stargazers"></div>

        <section style="text-align: center; margin-top: 15px; color: red; font-family: Courier New; font-weight: bold;" id="demoVersion"></section>
        <script>document.getElementById('demoVersion').innerHTML = 'Last Updated On: <time>' + new Date(window.demoVersion).toDateString() + '</time>';</script>

        <section class="experiment" style="padding: 5px;">
            <label for="time-interval">Time Interval (milliseconds):</label>
            <input type="text" id="time-interval" value="5000">

            <button id="start-recording">Start</button>
            <button id="stop-recording" disabled>Stop</button>

            <button id="pause-recording" disabled>Pause</button>
            <button id="resume-recording" disabled>Resume</button>

            <br>
            <br>

            <label for="video-width">Video Width:</label>
            <input type="text" id="video-width" value="320">

            <label for="video-height">Video Height:</label>
            <input type="text" id="video-height" value="240">
        </section>

        <section class="experiment">
            <div id="videos-container">
            </div>
        </section>
        <script>
            function captureUserMedia(mediaConstraints, successCallback, errorCallback) {
                navigator.mediaDevices.getUserMedia(mediaConstraints).then(successCallback).catch(errorCallback);
            }

            var mediaConstraints = {
                video: true
            };

            document.querySelector('#start-recording').onclick = function() {
                this.disabled = true;
                captureUserMedia(mediaConstraints, onMediaSuccess, onMediaError);
            };

            document.querySelector('#stop-recording').onclick = function() {
                this.disabled = true;
                mediaRecorder.stop();
                mediaRecorder.stream.stop();

                document.querySelector('#pause-recording').disabled = true;
                document.querySelector('#start-recording').disabled = false;
            };

            document.querySelector('#pause-recording').onclick = function() {
                this.disabled = true;
                mediaRecorder.pause();

                document.querySelector('#resume-recording').disabled = false;
            };

            document.querySelector('#resume-recording').onclick = function() {
                this.disabled = true;
                mediaRecorder.resume();

                document.querySelector('#pause-recording').disabled = false;
            };

            var mediaRecorder;

            function onMediaSuccess(stream) {
                var video = document.createElement('video');

                var videoWidth = document.getElementById('video-width').value || 320;
                var videoHeight = document.getElementById('video-height').value || 240;

                video = mergeProps(video, {
                    controls: true,
                    width: videoWidth,
                    height: videoHeight
                });
                video.srcObject = stream;
                video.play();

                videosContainer.appendChild(video);
                videosContainer.appendChild(document.createElement('hr'));

                mediaRecorder = new MediaStreamRecorder(stream);
                mediaRecorder.stream = stream;
                mediaRecorder.mimeType = 'image/gif'; // this line is mandatory
                mediaRecorder.videoWidth = videoWidth;
                mediaRecorder.videoHeight = videoHeight;
                mediaRecorder.ondataavailable = function(blob) {
                    var a = document.createElement('a');
                    a.target = '_blank';
                    a.innerHTML = 'Open Recorded GIF No. ' + (index++) + ' (Size: ' + bytesToSize(blob.size) + ') Time Length: ' + getTimeLength(timeInterval);

                    a.href = URL.createObjectURL(blob);

                    videosContainer.appendChild(a);
                    videosContainer.appendChild(document.createElement('hr'));
                };

                var timeInterval = document.querySelector('#time-interval').value;
                if (timeInterval) timeInterval = parseInt(timeInterval);
                else timeInterval = 5 * 1000;

                // get blob after specific time interval
                mediaRecorder.start(timeInterval);

                document.querySelector('#stop-recording').disabled = false;
                document.querySelector('#pause-recording').disabled = false;
            }

            function onMediaError(e) {
                console.error('media error', e);
            }

            var videosContainer = document.getElementById('videos-container');
            var index = 1;

            // below function via: http://goo.gl/B3ae8c
            function bytesToSize(bytes) {
                var k = 1000;
                var sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
                if (bytes === 0) return '0 Bytes';
                var i = parseInt(Math.floor(Math.log(bytes) / Math.log(k)), 10);
                return (bytes / Math.pow(k, i)).toPrecision(3) + ' ' + sizes[i];
            }

            // below function via: http://goo.gl/6QNDcI
            function getTimeLength(milliseconds) {
                var data = new Date(milliseconds);
                return data.getUTCHours() + " hours, " + data.getUTCMinutes() + " minutes and " + data.getUTCSeconds() + " second(s)";
            }

            window.onbeforeunload = function() {
                document.querySelector('#start-recording').disabled = false;
            };
        </script>

        <section class="experiment">
            <h2 id="how-to-use">How to use?</h2>
        <pre style="border-left: 2px solid red; margin-left:2em; padding-left: 1em;">
// cdn.webrtc-experiment.com/MediaStreamRecorder.js
// cdn.webrtc-experiment.com/gif-recorder.js

var mediaConstraints = {
    video: true
};

navigator.getUserMedia(mediaConstraints, onMediaSuccess, onMediaError);

function onMediaSuccess(stream) {
    var mediaRecorder = new MediaStreamRecorder(stream);
    mediaRecorder.mimeType = 'image/gif';
    mediaRecorder.ondataavailable = function (blob) {
        // POST/PUT "Blob" using FormData/XHR2
        var blobURL = URL.createObjectURL(blob);
        document.write('&lt;a href="' + blobURL + '"&gt;' + blobURL + '&lt;/a&gt;');
    };
    mediaRecorder.start(3000);
}

function onMediaError(e) {
    console.error('media error', e);
}
</pre>
        </section>

        <section class="experiment">
            <h2 class="header" id="updates" style="color: red; padding-bottom: .1em;"><a href="https://github.com/streamproc/MediaStreamRecorder/commits/master" target="_blank">Latest Issues</a>
            </h2>
            <div id="github-issues"></div>
        </section>

        <section class="experiment">
            <h2 class="header" id="updates" style="color: red; padding-bottom: .1em;"><a href="https://github.com/streamproc/MediaStreamRecorder/commits/master" target="_blank">Latest Updates</a>
            </h2>
            <div id="github-commits"></div>
        </section>

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            <a href="https://www.webrtc-experiment.com/">WebRTC Experiments</a> © <a href="https://plus.google.com/+MuazKhan" rel="author" target="_blank">Muaz Khan</a>
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