Created
May 25, 2018 11:30
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The basic principles for video streaming using MSE API
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| <!DOCTYPE html> | |
| <html> | |
| <body> | |
| <video style="width: 640px; height: 360px; border: solid 1px;"></video> | |
| <script> | |
| var queue = []; | |
| // Check that browser has support for media codec | |
| var mimeCodec = 'video/mp4; codecs="avc1.4D401F"'; | |
| console.log(MediaSource.isTypeSupported(mimeCodec)); | |
| // Create Media Source | |
| var mediaSource = new MediaSource(); // mediaSource.readyState === 'closed' | |
| // Get video element | |
| var video = document.querySelector('video'); | |
| // Attach media source to video element | |
| video.src = URL.createObjectURL(mediaSource); | |
| // Wait for media source to be open | |
| mediaSource.addEventListener('sourceopen', handleSourceOpen.bind(mediaSource)); | |
| function handleSourceOpen() { | |
| var mediaSource = this; // mediaSource.readyState === 'open' | |
| var sourceBuffer = mediaSource.addSourceBuffer(mimeCodec); | |
| /*** | |
| "Parse" manifest -> segments | |
| <Representation | |
| id="video=1660000" | |
| bandwidth="1660000" | |
| width="1280" | |
| height="720" | |
| sar="1:1" | |
| codecs="avc1.4D401F" | |
| scanType="progressive"> | |
| <SegmentTemplate | |
| timescale="12800" | |
| initialization="vinn-$RepresentationID$.dash" | |
| media="vinn-$RepresentationID$-$Time$.dash"> | |
| <SegmentTimeline> | |
| <S t="0" d="25600" r="51" /> | |
| <S d="20992" /> | |
| </SegmentTimeline> | |
| </SegmentTemplate> | |
| </Representation> | |
| ***/ | |
| queue.push("https://testcontent.eyevinn.technology/mse-tutorial/vinn-video=1660000-0.dash"); | |
| queue.push("https://testcontent.eyevinn.technology/mse-tutorial/vinn-video=1660000-25600.dash"); | |
| queue.push("https://testcontent.eyevinn.technology/mse-tutorial/vinn-video=1660000-51200.dash"); | |
| mediaSource.duration = 6; // (51200 + 25600) / 12800 | |
| // Fetch init segment (contains mp4 header) | |
| fetchSegmentAndAppend("https://testcontent.eyevinn.technology/mse-tutorial/vinn-video=1660000.dash", sourceBuffer, function() { | |
| function iter() { | |
| // Pop segment from queue | |
| url = queue.shift(); | |
| if (url === undefined) { | |
| return; | |
| } | |
| // Download segment and append to source buffer | |
| fetchSegmentAndAppend(url, sourceBuffer, function(err) { | |
| if (err) { | |
| console.error(err); | |
| } else { | |
| setTimeout(iter, 200); | |
| } | |
| }); | |
| } | |
| iter(); | |
| video.play(); | |
| }); | |
| } | |
| function fetchSegmentAndAppend(segmentUrl, sourceBuffer, callback) { | |
| fetchArrayBuffer(segmentUrl, function(buf) { | |
| sourceBuffer.addEventListener('updateend', function(ev) { | |
| callback(); | |
| }); | |
| sourceBuffer.addEventListener('error', function(ev) { | |
| callback(ev); | |
| }); | |
| sourceBuffer.appendBuffer(buf); | |
| }); | |
| } | |
| function fetchArrayBuffer(url, callback) { | |
| var xhr = new XMLHttpRequest(); | |
| xhr.open('get', url); | |
| xhr.responseType = 'arraybuffer'; | |
| xhr.onload = function() { | |
| callback(xhr.response); | |
| }; | |
| xhr.send(); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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