mjpeg-stream-player/index.html at master · proxy-m/mjpeg-stream-player · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">

<script>
	'use strict';
	var DEFAULT_FPS = 24,
		DEFAULT_AUTOLOOP = true,
		JPEG_MAGIG_NUMBER = [0xff, 0xd8, 0xff],
		JPEG_END_NUMBER = [0xff, 0xd9];
	var requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.msRequestAnimationFrame || window.setTimeout;

	var jpegs = [];
	var oldReminder = new Uint8Array(0);

	function splitMJPEG(mjpegUrl, callback) {
		fetch(mjpegUrl)
			.then(response => response.body)
			.then(rb => {
				const reader = rb.getReader();

				return new ReadableStream({
					start(controller) {
						// The following function handles each data chunk
						function push() {
							// "done" is a Boolean and value a "Uint8Array"
							reader.read().then(({done, value}) => {
								// If there is no more data to read
								if (done) {
									console.log('done', done);
									controller.close();
									return;
								}
								///// Get the data and send it to the browser via the controller
								///controller.enqueue(value);
								// Check chunks by logging to the console
								///console.log(done, value);

								var tmp = new Uint8Array(value),
									iStart;
								///alert(tmp.length);
								var array = new Uint8Array(oldReminder.length + tmp.length);
								array.set(oldReminder);
								array.set(tmp, oldReminder.length);
								oldReminder = new Uint8Array(0);

								find_jpeg_loop: for (var i = 0, len = array.length; i <= len - 2; ++i) {
									if (array[i] === JPEG_MAGIG_NUMBER[0] && array[i + 1] === JPEG_MAGIG_NUMBER[1] && array[i + 2] === JPEG_MAGIG_NUMBER[2]) {
										if (i > 0 && typeof iStart === 'number') {
											///alert(array.subarray(iStart, i));
											///alert(String.fromCharCode.apply(null, array.subarray(iStart, i)));
											for (var iEnd = iStart + 2; iEnd <= len - 2; ++iEnd) { //  search iEnd from old iStart
												if (array[iEnd] === JPEG_END_NUMBER[0] && array[iEnd + 1] === JPEG_END_NUMBER[1]) {
													jpegs.push(new Blob([array.subarray(iStart, iEnd)], {type: 'image/jpeg'}));
													iStart = Math.max(i, iStart); // next iStart
													i = Math.max(i, iEnd) + 1;
													continue find_jpeg_loop;
												}
											}
										}
										iStart = i; // next iStart
									}
								}
								///console.log(iStart, array.length);
								oldReminder = array.subarray(iStart);
								if (oldReminder.length > 20000000) {
									oldReminder = new Uint8Array(0); ///
								}
								////

								callback(jpegs);

								push();
							})
						}

						push();
					}
				});
			});
	}

	function playMJPEGInternal(wrapperElement, mjpegUrl, fps, autoloop) {
		fps = (typeof fps === 'number') ? fps : DEFAULT_FPS;
		autoloop = (typeof autoloop === 'boolean') ? autoloop : DEFAULT_AUTOLOOP;

		var playbackFinished = false,
			imageElement = document.createElement('img'),
			jpegUrl;

		imageElement.setAttribute('style', 'width:100%;');
		wrapperElement.appendChild(imageElement);

		splitMJPEG(mjpegUrl, function(jpegFiles) {
			if (jpegFiles.length > 0) {
				var nextFrameIndex = 0;
				///console.log(jpegFiles[nextFrameIndex]);

				function showNextFrame() {
					if (imageElement) {
						if (jpegUrl) {
							URL.revokeObjectURL(jpegUrl);
						}
						if (nextFrameIndex >= jpegFiles.length || jpegFiles.length == 0) {
							return;
						}
						jpegUrl = URL.createObjectURL(jpegFiles.shift());

						imageElement.onerror = function() {
							setTimeout(function() {
								requestAnimationFrame(showNextFrame);
							}, 1000 / fps);
						};

						imageElement.onload = function() {

							if (imageElement) {
								if (autoloop || nextFrameIndex < jpegFiles.length) {
									nextFrameIndex = (nextFrameIndex === jpegFiles.length) ? 0 : nextFrameIndex;
									setTimeout(function() {
										requestAnimationFrame(showNextFrame);
									}, 1000 / fps);
								}
							}
						};

						imageElement.setAttribute('src', jpegUrl);
					}
				};

				setTimeout(function() {
					requestAnimationFrame(showNextFrame);
				}, 1000 / fps);
			}
		});

		return {
			finish: function() {
				if (imageElement) {
					imageElement.src = '';
					wrapperElement.removeChild(imageElement);
					imageElement = undefined;
				}
			}
		};
	};
</script>

</head>
<body>
	<div id="mjpeg_stream_player_wrapper">
	</div>

	<script>
		var mjpegUrl = './data/bumblebee_flower_nature.mjpeg';
		var fps = 55;
		var autoloop = false; // not supported now
		playMJPEGInternal(document.getElementById('mjpeg_stream_player_wrapper'), mjpegUrl, fps, autoloop);
	</script>
</body>
</html>