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JiangWeixian/在微信里面播放视频

Created December 24, 2019 05:34
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在微信里面播放视频
var JSMpeg = {
Player: null,
VideoElement: null,
BitBuffer: null,
Source: {},
Demuxer: {},
Decoder: {},
Renderer: {},
AudioOutput: {},
Now: function() {
return window.performance ? window.performance.now() / 1e3 : Date.now() / 1e3
},
CreateVideoElements: function() {
var elements = document.querySelectorAll(".jsmpeg");
for (var i = 0; i < elements.length; i++) {
new JSMpeg.VideoElement(elements[i])
}
},
Fill: function(array, value) {
if (array.fill) {
array.fill(value)
} else {
for (var i = 0; i < array.length; i++) {
array[i] = value
}
}
}
};
if (document.readyState === "complete") {
JSMpeg.CreateVideoElements()
} else {
document.addEventListener("DOMContentLoaded", JSMpeg.CreateVideoElements)
}
JSMpeg.VideoElement = function() {
"use strict";
var VideoElement = function(element) {
var url = element.dataset.url;
if (!url) {
throw "VideoElement has no `data-url` attribute"
}
var addStyles = function(element, styles) {
for (var name in styles) {
element.style[name] = styles[name]
}
};
this.container = element;
addStyles(this.container, {
display: "inline-block",
position: "relative",
minWidth: "80px",
minHeight: "80px"
});
this.canvas = document.createElement("canvas");
this.canvas.width = 960;
this.canvas.height = 540;
addStyles(this.canvas, {
display: "block",
width: "100%"
});
this.container.appendChild(this.canvas);
this.playButton = document.createElement("div");
this.playButton.innerHTML = VideoElement.PLAY_BUTTON;
addStyles(this.playButton, {
zIndex: 2,
position: "absolute",
top: "0",
bottom: "0",
left: "0",
right: "0",
maxWidth: "75px",
maxHeight: "75px",
margin: "auto",
opacity: "0.7",
cursor: "pointer"
});
this.container.appendChild(this.playButton);
var options = {
canvas: this.canvas
};
for (var option in element.dataset) {
try {
options[option] = JSON.parse(element.dataset[option])
} catch (err) {
options[option] = element.dataset[option]
}
}
this.player = new JSMpeg.Player(url,options);
element.playerInstance = this.player;
if (options.poster && !options.autoplay && !this.player.options.streaming) {
options.decodeFirstFrame = false;
this.poster = new Image;
this.poster.src = options.poster;
this.poster.addEventListener("load", this.posterLoaded);
addStyles(this.poster, {
display: "block",
zIndex: 1,
position: "absolute",
top: 0,
left: 0,
bottom: 0,
right: 0
});
this.container.appendChild(this.poster)
}
if (!this.player.options.streaming) {
this.container.addEventListener("click", this.onClick.bind(this))
}
if (options.autoplay || this.player.options.streaming) {
this.playButton.style.display = "none"
}
if (this.player.audioOut && !this.player.audioOut.unlocked) {
var unlockAudioElement = this.container;
if (options.autoplay || this.player.options.streaming) {
this.unmuteButton = document.createElement("div");
this.unmuteButton.innerHTML = VideoElement.UNMUTE_BUTTON;
addStyles(this.unmuteButton, {
zIndex: 2,
position: "absolute",
bottom: "10px",
right: "20px",
width: "75px",
height: "75px",
margin: "auto",
opacity: "0.7",
cursor: "pointer"
});
this.container.appendChild(this.unmuteButton);
unlockAudioElement = this.unmuteButton
}
this.unlockAudioBound = this.onUnlockAudio.bind(this, unlockAudioElement);
unlockAudioElement.addEventListener("touchstart", this.unlockAudioBound, false);
unlockAudioElement.addEventListener("click", this.unlockAudioBound, true)
}
};
VideoElement.prototype.onUnlockAudio = function(element, ev) {
if (this.unmuteButton) {
ev.preventDefault();
ev.stopPropagation()
}
this.player.audioOut.unlock(function() {
if (this.unmuteButton) {
this.unmuteButton.style.display = "none"
}
element.removeEventListener("touchstart", this.unlockAudioBound);
element.removeEventListener("click", this.unlockAudioBound)
}
.bind(this))
}
;
VideoElement.prototype.onClick = function(ev) {
if (this.player.isPlaying) {
this.player.pause();
this.playButton.style.display = "block"
} else {
this.player.play();
this.playButton.style.display = "none";
if (this.poster) {
this.poster.style.display = "none"
}
}
}
;
VideoElement.PLAY_BUTTON = '<svg style="max-width: 75px; max-height: 75px;" ' + 'viewBox="0 0 200 200" alt="Play video">' + '<circle cx="100" cy="100" r="90" fill="none" ' + 'stroke-width="15" stroke="#fff"/>' + '<polygon points="70, 55 70, 145 145, 100" fill="#fff"/>' + "</svg>";
VideoElement.UNMUTE_BUTTON = '<svg style="max-width: 75px; max-height: 75px;" viewBox="0 0 75 75">' + '<polygon class="audio-speaker" stroke="none" fill="#fff" ' + 'points="39,13 22,28 6,28 6,47 21,47 39,62 39,13"/>' + '<g stroke="#fff" stroke-width="5">' + '<path d="M 49,50 69,26"/>' + '<path d="M 69,50 49,26"/>' + "</g>" + "</svg>";
return VideoElement
}();
JSMpeg.Player = function() {
"use strict";
var Player = function(url, options) {
this.options = options || {};
if (options.source) {
this.source = new options.source(url,options);
options.streaming = !!this.source.streaming
} else if (url.match(/^wss?:\/\//)) {
this.source = new JSMpeg.Source.WebSocket(url,options);
options.streaming = true
} else if (options.progressive !== false) {
this.source = new JSMpeg.Source.AjaxProgressive(url,options);
options.streaming = false
} else {
this.source = new JSMpeg.Source.Ajax(url,options);
options.streaming = false
}
this.end = false;
this.maxAudioLag = options.maxAudioLag || .25;
this.loop = options.loop !== false;
this.autoplay = !!options.autoplay || options.streaming;
this.demuxer = new JSMpeg.Demuxer.TS(options);
this.source.connect(this.demuxer);
if (options.video !== false) {
this.video = new JSMpeg.Decoder.MPEG1Video(options);
this.renderer = !options.disableGl && JSMpeg.Renderer.WebGL.IsSupported() ? new JSMpeg.Renderer.WebGL(options) : new JSMpeg.Renderer.Canvas2D(options);
this.demuxer.connect(JSMpeg.Demuxer.TS.STREAM.VIDEO_1, this.video);
this.video.connect(this.renderer)
}
if (options.audio !== false && JSMpeg.AudioOutput.WebAudio.IsSupported()) {
this.audio = new JSMpeg.Decoder.MP2Audio(options);
this.audioOut = new JSMpeg.AudioOutput.WebAudio(options);
this.demuxer.connect(JSMpeg.Demuxer.TS.STREAM.AUDIO_1, this.audio);
this.audio.connect(this.audioOut)
}
Object.defineProperty(this, "currentTime", {
get: this.getCurrentTime,
set: this.setCurrentTime
});
Object.defineProperty(this, "volume", {
get: this.getVolume,
set: this.setVolume
});
this.unpauseOnShow = false;
if (options.pauseWhenHidden !== false) {
document.addEventListener("visibilitychange", this.showHide.bind(this))
}
this.source.start();
if (this.autoplay) {
this.play()
}
};
Player.prototype.showHide = function(ev) {
if (document.visibilityState === "hidden") {
this.unpauseOnShow = this.wantsToPlay;
this.pause()
} else if (this.unpauseOnShow) {
this.play()
}
}
;
Player.prototype.play = function(ev) {
this.animationId = requestAnimationFrame(this.update.bind(this));
this.wantsToPlay = true
this.end = false;
}
;
Player.prototype.pause = function(ev) {
cancelAnimationFrame(this.animationId);
this.wantsToPlay = false;
this.isPlaying = false;
this.end = true;
if (this.audio && this.audio.canPlay) {
this.audioOut.stop();
this.seek(this.currentTime)
}
}
;
Player.prototype.getVolume = function() {
return this.audioOut ? this.audioOut.volume : 0
}
;
Player.prototype.setVolume = function(volume) {
if (this.audioOut) {
this.audioOut.volume = volume
}
}
;
Player.prototype.stop = function(ev) {
this.pause();
this.seek(0);
if (this.video && this.options.decodeFirstFrame !== false) {
this.video.decode()
}
}
;
Player.prototype.destroy = function() {
this.pause();
this.source.destroy();
this.renderer.destroy();
this.audioOut.destroy()
}
;
Player.prototype.seek = function(time) {
var startOffset = this.audio && this.audio.canPlay ? this.audio.startTime : this.video.startTime;
if (this.video) {
this.video.seek(time + startOffset)
}
if (this.audio) {
this.audio.seek(time + startOffset)
}
this.startTime = JSMpeg.Now() - time
}
;
Player.prototype.getCurrentTime = function() {
return this.audio && this.audio.canPlay ? this.audio.currentTime - this.audio.startTime : this.video.currentTime - this.video.startTime
}
;
Player.prototype.setCurrentTime = function(time) {
this.seek(time)
}
;
Player.prototype.update = function() {
this.animationId = requestAnimationFrame(this.update.bind(this));
if (!this.source.established) {
if (this.renderer) {
this.renderer.renderProgress(this.source.progress)
}
return
}
if (!this.isPlaying) {
this.isPlaying = true;
this.startTime = JSMpeg.Now() - this.currentTime
}
if (this.options.streaming) {
this.updateForStreaming()
} else {
this.updateForStaticFile()
}
}
;
Player.prototype.updateForStreaming = function() {
if (this.video) {
this.video.decode()
}
if (this.audio) {
var decoded = false;
do {
if (this.audioOut.enqueuedTime > this.maxAudioLag) {
this.audioOut.resetEnqueuedTime();
this.audioOut.enabled = false
}
decoded = this.audio.decode()
} while (decoded);this.audioOut.enabled = true
}
}
;
Player.prototype.updateForStaticFile = function() {
var notEnoughData = false
, headroom = 0;
if (this.audio && this.audio.canPlay) {
while (!notEnoughData && this.audio.decodedTime - this.audio.currentTime < .25) {
notEnoughData = !this.audio.decode()
}
if (this.video && this.video.currentTime < this.audio.currentTime) {
notEnoughData = !this.video.decode()
}
headroom = this.demuxer.currentTime - this.audio.currentTime
} else if (this.video) {
var targetTime = JSMpeg.Now() - this.startTime + this.video.startTime
, lateTime = targetTime - this.video.currentTime
, frameTime = 1 / this.video.frameRate;
if (this.video && lateTime > 0) {
if (lateTime > frameTime * 2) {
this.startTime += lateTime
}
notEnoughData = !this.video.decode()
}
headroom = this.demuxer.currentTime - targetTime
}
this.source.resume(headroom);
if (notEnoughData && this.source.completed) {
if (this.loop) {
this.seek(0)
} else {
this.pause()
}
}
}
;
return Player
}();
JSMpeg.BitBuffer = function() {
"use strict";
var BitBuffer = function(bufferOrLength, mode) {
if (typeof bufferOrLength === "object") {
this.bytes = bufferOrLength instanceof Uint8Array ? bufferOrLength : new Uint8Array(bufferOrLength);
this.byteLength = this.bytes.length
} else {
this.bytes = new Uint8Array(bufferOrLength || 1024 * 1024);
this.byteLength = 0
}
this.mode = mode || BitBuffer.MODE.EXPAND;
this.index = 0
};
BitBuffer.prototype.resize = function(size) {
var newBytes = new Uint8Array(size);
if (this.byteLength !== 0) {
this.byteLength = Math.min(this.byteLength, size);
newBytes.set(this.bytes, 0, this.byteLength)
}
this.bytes = newBytes;
this.index = Math.min(this.index, this.byteLength << 3)
}
;
BitBuffer.prototype.evict = function(sizeNeeded) {
var bytePos = this.index >> 3
, available = this.bytes.length - this.byteLength;
if (this.index === this.byteLength << 3 || sizeNeeded > available + bytePos) {
this.byteLength = 0;
this.index = 0;
return
} else if (bytePos === 0) {
return
}
if (this.bytes.copyWithin) {
this.bytes.copyWithin(0, bytePos, this.byteLength)
} else {
this.bytes.set(this.bytes.subarray(bytePos, this.byteLength))
}
this.byteLength = this.byteLength - bytePos;
this.index -= bytePos << 3;
return
}
;
BitBuffer.prototype.write = function(buffers) {
var isArrayOfBuffers = typeof buffers[0] === "object"
, totalLength = 0
, available = this.bytes.length - this.byteLength;
if (isArrayOfBuffers) {
var totalLength = 0;
for (var i = 0; i < buffers.length; i++) {
totalLength += buffers[i].byteLength
}
} else {
totalLength = buffers.byteLength
}
if (totalLength > available) {
if (this.mode === BitBuffer.MODE.EXPAND) {
var newSize = Math.max(this.bytes.length * 2, totalLength - available);
this.resize(newSize)
} else {
this.evict(totalLength)
}
}
if (isArrayOfBuffers) {
for (var i = 0; i < buffers.length; i++) {
this.appendSingleBuffer(buffers[i])
}
} else {
this.appendSingleBuffer(buffers)
}
}
;
BitBuffer.prototype.appendSingleBuffer = function(buffer) {
buffer = buffer instanceof Uint8Array ? buffer : new Uint8Array(buffer);
this.bytes.set(buffer, this.byteLength);
this.byteLength += buffer.length
}
;
BitBuffer.prototype.findNextStartCode = function() {
for (var i = this.index + 7 >> 3; i < this.byteLength; i++) {
if (this.bytes[i] == 0 && this.bytes[i + 1] == 0 && this.bytes[i + 2] == 1) {
this.index = i + 4 << 3;
return this.bytes[i + 3]
}
}
this.index = this.byteLength << 3;
return -1
}
;
BitBuffer.prototype.findStartCode = function(code) {
var current = 0;
while (true) {
current = this.findNextStartCode();
if (current === code || current === -1) {
return current
}
}
return -1
}
;
BitBuffer.prototype.nextBytesAreStartCode = function() {
var i = this.index + 7 >> 3;
return i >= this.byteLength || this.bytes[i] == 0 && this.bytes[i + 1] == 0 && this.bytes[i + 2] == 1
}
;
BitBuffer.prototype.peek = function(count) {
var offset = this.index;
var value = 0;
while (count) {
var currentByte = this.bytes[offset >> 3]
, remaining = 8 - (offset & 7)
, read = remaining < count ? remaining : count
, shift = remaining - read
, mask = 255 >> 8 - read;
value = value << read | (currentByte & mask << shift) >> shift;
offset += read;
count -= read
}
return value
}
;
BitBuffer.prototype.read = function(count) {
var value = this.peek(count);
this.index += count;
return value
}
;
BitBuffer.prototype.skip = function(count) {
return this.index += count
}
;
BitBuffer.prototype.rewind = function(count) {
this.index = Math.max(this.index - count, 0)
}
;
BitBuffer.prototype.has = function(count) {
return (this.byteLength << 3) - this.index >= count
}
;
BitBuffer.MODE = {
EVICT: 1,
EXPAND: 2
};
return BitBuffer
}();
JSMpeg.Source.Ajax = function() {
"use strict";
var AjaxSource = function(url, options) {
this.url = url;
this.destination = null;
this.request = null;
this.completed = false;
this.established = false;
this.progress = 0
};
AjaxSource.prototype.connect = function(destination) {
this.destination = destination
}
;
AjaxSource.prototype.start = function() {
this.request = new XMLHttpRequest;
this.request.onreadystatechange = function() {
if (this.request.readyState === this.request.DONE && this.request.status === 200) {
this.onLoad(this.request.response)
}
}
.bind(this);
this.request.onprogress = this.onProgress.bind(this);
this.request.open("GET", this.url);
this.request.responseType = "arraybuffer";
this.request.send()
}
;
AjaxSource.prototype.resume = function(secondsHeadroom) {}
;
AjaxSource.prototype.destroy = function() {
this.request.abort()
}
;
AjaxSource.prototype.onProgress = function(ev) {
this.progress = ev.loaded / ev.total
}
;
AjaxSource.prototype.onLoad = function(data) {
this.established = true;
this.completed = true;
this.progress = 1;
if (this.destination) {
this.destination.write(data)
}
}
;
return AjaxSource
}();
JSMpeg.Source.AjaxProgressive = function() {
"use strict";
var AjaxProgressiveSource = function(url, options) {
this.url = url;
this.destination = null;
this.request = null;
this.completed = false;
this.established = false;
this.progress = 0;
this.fileSize = 0;
this.loadedSize = 0;
this.chunkSize = options.chunkSize || 1024 * 1024;
this.isLoading = false;
this.loadStartTime = 0;
this.throttled = options.throttled !== false;
this.aborted = false
};
AjaxProgressiveSource.prototype.connect = function(destination) {
this.destination = destination
}
;
AjaxProgressiveSource.prototype.start = function() {
this.request = new XMLHttpRequest;
this.request.onreadystatechange = function() {
if (this.request.readyState === this.request.DONE) {
this.fileSize = parseInt(this.request.getResponseHeader("Content-Length"));
this.loadNextChunk()
}
}
.bind(this);
this.request.onprogress = this.onProgress.bind(this);
this.request.open("HEAD", this.url);
this.request.send()
}
;
AjaxProgressiveSource.prototype.resume = function(secondsHeadroom) {
if (this.isLoading || !this.throttled) {
return
}
var worstCaseLoadingTime = this.loadTime * 8 + 2;
if (worstCaseLoadingTime > secondsHeadroom) {
this.loadNextChunk()
}
}
;
AjaxProgressiveSource.prototype.destroy = function() {
this.request.abort();
this.aborted = true
}
;
AjaxProgressiveSource.prototype.loadNextChunk = function() {
var start = this.loadedSize
, end = Math.min(this.loadedSize + this.chunkSize - 1, this.fileSize - 1);
if (start >= this.fileSize || this.aborted) {
this.completed = true;
return
}
this.isLoading = true;
this.loadStartTime = JSMpeg.Now();
this.request = new XMLHttpRequest;
this.request.onreadystatechange = function() {
if (this.request.readyState === this.request.DONE && this.request.status >= 200 && this.request.status < 300) {
this.onChunkLoad(this.request.response)
} else if (this.request.readyState === this.request.DONE) {
if (this.loadFails++ < 3) {
this.loadNextChunk()
}
}
}
.bind(this);
if (start === 0) {
this.request.onprogress = this.onProgress.bind(this)
}
this.request.open("GET", this.url + "?" + start + "-" + end);
this.request.setRequestHeader("Range", "bytes=" + start + "-" + end);
this.request.responseType = "arraybuffer";
this.request.send()
}
;
AjaxProgressiveSource.prototype.onProgress = function(ev) {
this.progress = ev.loaded / ev.total
}
;
AjaxProgressiveSource.prototype.onChunkLoad = function(data) {
this.established = true;
this.progress = 1;
this.loadedSize += data.byteLength;
this.loadFails = 0;
this.isLoading = false;
if (this.destination) {
this.destination.write(data)
}
this.loadTime = JSMpeg.Now() - this.loadStartTime;
if (!this.throttled) {
this.loadNextChunk()
}
}
;
return AjaxProgressiveSource
}();
JSMpeg.Source.WebSocket = function() {
"use strict";
var WSSource = function(url, options) {
this.url = url;
this.options = options;
this.socket = null;
this.callbacks = {
connect: [],
data: []
};
this.destination = null;
this.reconnectInterval = options.reconnectInterval !== undefined ? options.reconnectInterval : 5;
this.shouldAttemptReconnect = !!this.reconnectInterval;
this.completed = false;
this.established = false;
this.progress = 0;
this.reconnectTimeoutId = 0
};
WSSource.prototype.connect = function(destination) {
this.destination = destination
}
;
WSSource.prototype.destroy = function() {
clearTimeout(this.reconnectTimeoutId);
this.shouldAttemptReconnect = false;
this.socket.close()
}
;
WSSource.prototype.start = function() {
this.shouldAttemptReconnect = !!this.reconnectInterval;
this.progress = 0;
this.established = false;
this.socket = new WebSocket(this.url,this.options.protocols || null);
this.socket.binaryType = "arraybuffer";
this.socket.onmessage = this.onMessage.bind(this);
this.socket.onopen = this.onOpen.bind(this);
this.socket.onerror = this.onClose.bind(this);
this.socket.onclose = this.onClose.bind(this)
}
;
WSSource.prototype.resume = function(secondsHeadroom) {}
;
WSSource.prototype.onOpen = function() {
this.progress = 1;
this.established = true
}
;
WSSource.prototype.onClose = function() {
if (this.shouldAttemptReconnect) {
clearTimeout(this.reconnectTimeoutId);
this.reconnectTimeoutId = setTimeout(function() {
this.start()
}
.bind(this), this.reconnectInterval * 1e3)
}
}
;
WSSource.prototype.onMessage = function(ev) {
if (this.destination) {
this.destination.write(ev.data)
}
}
;
return WSSource
}();
JSMpeg.Demuxer.TS = function() {
"use strict";
var TS = function(options) {
this.bits = null;
this.leftoverBytes = null;
this.guessVideoFrameEnd = true;
this.pidsToStreamIds = {};
this.pesPacketInfo = {};
this.startTime = 0;
this.currentTime = 0
};
TS.prototype.connect = function(streamId, destination) {
this.pesPacketInfo[streamId] = {
destination: destination,
currentLength: 0,
totalLength: 0,
pts: 0,
buffers: []
}
}
;
TS.prototype.write = function(buffer) {
if (this.leftoverBytes) {
var totalLength = buffer.byteLength + this.leftoverBytes.byteLength;
this.bits = new JSMpeg.BitBuffer(totalLength);
this.bits.write([this.leftoverBytes, buffer])
} else {
this.bits = new JSMpeg.BitBuffer(buffer)
}
while (this.bits.has(188 << 3) && this.parsePacket()) {}
var leftoverCount = this.bits.byteLength - (this.bits.index >> 3);
this.leftoverBytes = leftoverCount > 0 ? this.bits.bytes.subarray(this.bits.index >> 3) : null
}
;
TS.prototype.parsePacket = function() {
if (this.bits.read(8) !== 71) {
if (!this.resync()) {
return false
}
}
var end = (this.bits.index >> 3) + 187;
var transportError = this.bits.read(1)
, payloadStart = this.bits.read(1)
, transportPriority = this.bits.read(1)
, pid = this.bits.read(13)
, transportScrambling = this.bits.read(2)
, adaptationField = this.bits.read(2)
, continuityCounter = this.bits.read(4);
var streamId = this.pidsToStreamIds[pid];
if (payloadStart && streamId) {
var pi = this.pesPacketInfo[streamId];
if (pi && pi.currentLength) {
this.packetComplete(pi)
}
}
if (adaptationField & 1) {
if (adaptationField & 2) {
var adaptationFieldLength = this.bits.read(8);
this.bits.skip(adaptationFieldLength << 3)
}
if (payloadStart && this.bits.nextBytesAreStartCode()) {
this.bits.skip(24);
streamId = this.bits.read(8);
this.pidsToStreamIds[pid] = streamId;
var packetLength = this.bits.read(16);
this.bits.skip(8);
var ptsDtsFlag = this.bits.read(2);
this.bits.skip(6);
var headerLength = this.bits.read(8);
var payloadBeginIndex = this.bits.index + (headerLength << 3);
var pi = this.pesPacketInfo[streamId];
if (pi) {
var pts = 0;
if (ptsDtsFlag & 2) {
this.bits.skip(4);
var p32_30 = this.bits.read(3);
this.bits.skip(1);
var p29_15 = this.bits.read(15);
this.bits.skip(1);
var p14_0 = this.bits.read(15);
this.bits.skip(1);
pts = (p32_30 * 1073741824 + p29_15 * 32768 + p14_0) / 9e4;
this.currentTime = pts;
if (this.startTime === -1) {
this.startTime = pts
}
}
var payloadLength = packetLength ? packetLength - headerLength - 3 : 0;
this.packetStart(pi, pts, payloadLength)
}
this.bits.index = payloadBeginIndex
}
if (streamId) {
var pi = this.pesPacketInfo[streamId];
if (pi) {
var start = this.bits.index >> 3;
var complete = this.packetAddData(pi, start, end);
var hasPadding = !payloadStart && adaptationField & 2;
if (complete || this.guessVideoFrameEnd && hasPadding) {
this.packetComplete(pi)
}
}
}
}
this.bits.index = end << 3;
return true
}
;
TS.prototype.resync = function() {
if (!this.bits.has(188 * 6 << 3)) {
return false
}
var byteIndex = this.bits.index >> 3;
for (var i = 0; i < 187; i++) {
if (this.bits.bytes[byteIndex + i] === 71) {
var foundSync = true;
for (var j = 1; j < 5; j++) {
if (this.bits.bytes[byteIndex + i + 188 * j] !== 71) {
foundSync = false;
break
}
}
if (foundSync) {
this.bits.index = byteIndex + i + 1 << 3;
return true
}
}
}
console.warn("JSMpeg: Possible garbage data. Skipping.");
this.bits.skip(187 << 3);
return false
}
;
TS.prototype.packetStart = function(pi, pts, payloadLength) {
pi.totalLength = payloadLength;
pi.currentLength = 0;
pi.pts = pts
}
;
TS.prototype.packetAddData = function(pi, start, end) {
pi.buffers.push(this.bits.bytes.subarray(start, end));
pi.currentLength += end - start;
var complete = pi.totalLength !== 0 && pi.currentLength >= pi.totalLength;
return complete
}
;
TS.prototype.packetComplete = function(pi) {
pi.destination.write(pi.pts, pi.buffers);
pi.totalLength = 0;
pi.currentLength = 0;
pi.buffers = []
}
;
TS.STREAM = {
PACK_HEADER: 186,
SYSTEM_HEADER: 187,
PROGRAM_MAP: 188,
PRIVATE_1: 189,
PADDING: 190,
PRIVATE_2: 191,
AUDIO_1: 192,
VIDEO_1: 224,
DIRECTORY: 255
};
return TS
}();
JSMpeg.Decoder.Base = function() {
"use strict";
var BaseDecoder = function(options) {
this.destination = null;
this.canPlay = false;
this.collectTimestamps = !options.streaming;
this.timestamps = [];
this.timestampIndex = 0;
this.startTime = 0;
this.decodedTime = 0;
Object.defineProperty(this, "currentTime", {
get: this.getCurrentTime
})
};
BaseDecoder.prototype.connect = function(destination) {
this.destination = destination
}
;
BaseDecoder.prototype.write = function(pts, buffers) {
if (this.collectTimestamps) {
if (this.timestamps.length === 0) {
this.startTime = pts;
this.decodedTime = pts
}
this.timestamps.push({
index: this.bits.byteLength << 3,
time: pts
})
}
this.bits.write(buffers);
this.canPlay = true
}
;
BaseDecoder.prototype.seek = function(time) {
if (!this.collectTimestamps) {
return
}
this.timestampIndex = 0;
for (var i = 0; i < this.timestamps.length; i++) {
if (this.timestamps[i].time > time) {
break
}
this.timestampIndex = i
}
var ts = this.timestamps[this.timestampIndex];
if (ts) {
this.bits.index = ts.index;
this.decodedTime = ts.time
} else {
this.bits.index = 0;
this.decodedTime = this.startTime
}
}
;
BaseDecoder.prototype.decode = function() {
this.advanceDecodedTime(0)
}
;
BaseDecoder.prototype.advanceDecodedTime = function(seconds) {
if (this.collectTimestamps) {
var newTimestampIndex = -1;
for (var i = this.timestampIndex; i < this.timestamps.length; i++) {
if (this.timestamps[i].index > this.bits.index) {
break
}
newTimestampIndex = i
}
if (newTimestampIndex !== -1 && newTimestampIndex !== this.timestampIndex) {
this.timestampIndex = newTimestampIndex;
this.decodedTime = this.timestamps[this.timestampIndex].time;
return
}
}
this.decodedTime += seconds
}
;
BaseDecoder.prototype.getCurrentTime = function() {
return this.decodedTime
}
;
return BaseDecoder
}();
JSMpeg.Decoder.MPEG1Video = function() {
"use strict";
var MPEG1 = function(options) {
JSMpeg.Decoder.Base.call(this, options);
var bufferSize = options.videoBufferSize || 512 * 1024;
var bufferMode = options.streaming ? JSMpeg.BitBuffer.MODE.EVICT : JSMpeg.BitBuffer.MODE.EXPAND;
this.bits = new JSMpeg.BitBuffer(bufferSize,bufferMode);
this.customIntraQuantMatrix = new Uint8Array(64);
this.customNonIntraQuantMatrix = new Uint8Array(64);
this.blockData = new Int32Array(64);
this.currentFrame = 0;
this.decodeFirstFrame = options.decodeFirstFrame !== false
};
MPEG1.prototype = Object.create(JSMpeg.Decoder.Base.prototype);
MPEG1.prototype.constructor = MPEG1;
MPEG1.prototype.write = function(pts, buffers) {
JSMpeg.Decoder.Base.prototype.write.call(this, pts, buffers);
if (!this.hasSequenceHeader) {
if (this.bits.findStartCode(MPEG1.START.SEQUENCE) === -1) {
return false
}
this.decodeSequenceHeader();
if (this.decodeFirstFrame) {
this.decode()
}
}
}
;
MPEG1.prototype.decode = function() {
if (!this.hasSequenceHeader) {
return false
}
if (this.bits.findStartCode(MPEG1.START.PICTURE) === -1) {
var bufferedBytes = this.bits.byteLength - (this.bits.index >> 3);
return false
}
this.decodePicture();
this.advanceDecodedTime(1 / this.frameRate);
return true
}
;
MPEG1.prototype.readHuffman = function(codeTable) {
var state = 0;
do {
state = codeTable[state + this.bits.read(1)]
} while (state >= 0 && codeTable[state] !== 0);return codeTable[state + 2]
}
;
MPEG1.prototype.frameRate = 30;
MPEG1.prototype.decodeSequenceHeader = function() {
var newWidth = this.bits.read(12)
, newHeight = this.bits.read(12);
this.bits.skip(4);
this.frameRate = MPEG1.PICTURE_RATE[this.bits.read(4)];
this.bits.skip(18 + 1 + 10 + 1);
if (newWidth !== this.width || newHeight !== this.height) {
this.width = newWidth;
this.height = newHeight;
this.initBuffers();
if (this.destination) {
this.destination.resize(newWidth, newHeight)
}
}
if (this.bits.read(1)) {
for (var i = 0; i < 64; i++) {
this.customIntraQuantMatrix[MPEG1.ZIG_ZAG[i]] = this.bits.read(8)
}
this.intraQuantMatrix = this.customIntraQuantMatrix
}
if (this.bits.read(1)) {
for (var i = 0; i < 64; i++) {
var idx = MPEG1.ZIG_ZAG[i];
this.customNonIntraQuantMatrix[idx] = this.bits.read(8)
}
this.nonIntraQuantMatrix = this.customNonIntraQuantMatrix
}
this.hasSequenceHeader = true
}
;
MPEG1.prototype.initBuffers = function() {
this.intraQuantMatrix = MPEG1.DEFAULT_INTRA_QUANT_MATRIX;
this.nonIntraQuantMatrix = MPEG1.DEFAULT_NON_INTRA_QUANT_MATRIX;
this.mbWidth = this.width + 15 >> 4;
this.mbHeight = this.height + 15 >> 4;
this.mbSize = this.mbWidth * this.mbHeight;
this.codedWidth = this.mbWidth << 4;
this.codedHeight = this.mbHeight << 4;
this.codedSize = this.codedWidth * this.codedHeight;
this.halfWidth = this.mbWidth << 3;
this.halfHeight = this.mbHeight << 3;
this.currentY = new Uint8ClampedArray(this.codedSize);
this.currentY32 = new Uint32Array(this.currentY.buffer);
this.currentCr = new Uint8ClampedArray(this.codedSize >> 2);
this.currentCr32 = new Uint32Array(this.currentCr.buffer);
this.currentCb = new Uint8ClampedArray(this.codedSize >> 2);
this.currentCb32 = new Uint32Array(this.currentCb.buffer);
this.forwardY = new Uint8ClampedArray(this.codedSize);
this.forwardY32 = new Uint32Array(this.forwardY.buffer);
this.forwardCr = new Uint8ClampedArray(this.codedSize >> 2);
this.forwardCr32 = new Uint32Array(this.forwardCr.buffer);
this.forwardCb = new Uint8ClampedArray(this.codedSize >> 2);
this.forwardCb32 = new Uint32Array(this.forwardCb.buffer)
}
;
MPEG1.prototype.currentY = null;
MPEG1.prototype.currentCr = null;
MPEG1.prototype.currentCb = null;
MPEG1.prototype.pictureType = 0;
MPEG1.prototype.forwardY = null;
MPEG1.prototype.forwardCr = null;
MPEG1.prototype.forwardCb = null;
MPEG1.prototype.fullPelForward = false;
MPEG1.prototype.forwardFCode = 0;
MPEG1.prototype.forwardRSize = 0;
MPEG1.prototype.forwardF = 0;
MPEG1.prototype.decodePicture = function(skipOutput) {
this.currentFrame++;
this.bits.skip(10);
this.pictureType = this.bits.read(3);
this.bits.skip(16);
if (this.pictureType <= 0 || this.pictureType >= MPEG1.PICTURE_TYPE.B) {
return
}
if (this.pictureType === MPEG1.PICTURE_TYPE.PREDICTIVE) {
this.fullPelForward = this.bits.read(1);
this.forwardFCode = this.bits.read(3);
if (this.forwardFCode === 0) {
return
}
this.forwardRSize = this.forwardFCode - 1;
this.forwardF = 1 << this.forwardRSize
}
var code = 0;
do {
code = this.bits.findNextStartCode()
} while (code === MPEG1.START.EXTENSION || code === MPEG1.START.USER_DATA);while (code >= MPEG1.START.SLICE_FIRST && code <= MPEG1.START.SLICE_LAST) {
this.decodeSlice(code & 255);
code = this.bits.findNextStartCode()
}
if (code !== -1) {
this.bits.rewind(32)
}
if (this.destination) {
this.destination.render(this.currentY, this.currentCr, this.currentCb)
}
if (this.pictureType === MPEG1.PICTURE_TYPE.INTRA || this.pictureType === MPEG1.PICTURE_TYPE.PREDICTIVE) {
var tmpY = this.forwardY
, tmpY32 = this.forwardY32
, tmpCr = this.forwardCr
, tmpCr32 = this.forwardCr32
, tmpCb = this.forwardCb
, tmpCb32 = this.forwardCb32;
this.forwardY = this.currentY;
this.forwardY32 = this.currentY32;
this.forwardCr = this.currentCr;
this.forwardCr32 = this.currentCr32;
this.forwardCb = this.currentCb;
this.forwardCb32 = this.currentCb32;
this.currentY = tmpY;
this.currentY32 = tmpY32;
this.currentCr = tmpCr;
this.currentCr32 = tmpCr32;
this.currentCb = tmpCb;
this.currentCb32 = tmpCb32
}
}
;
MPEG1.prototype.quantizerScale = 0;
MPEG1.prototype.sliceBegin = false;
MPEG1.prototype.decodeSlice = function(slice) {
this.sliceBegin = true;
this.macroblockAddress = (slice - 1) * this.mbWidth - 1;
this.motionFwH = this.motionFwHPrev = 0;
this.motionFwV = this.motionFwVPrev = 0;
this.dcPredictorY = 128;
this.dcPredictorCr = 128;
this.dcPredictorCb = 128;
this.quantizerScale = this.bits.read(5);
while (this.bits.read(1)) {
this.bits.skip(8)
}
do {
this.decodeMacroblock()
} while (!this.bits.nextBytesAreStartCode())
}
;
MPEG1.prototype.macroblockAddress = 0;
MPEG1.prototype.mbRow = 0;
MPEG1.prototype.mbCol = 0;
MPEG1.prototype.macroblockType = 0;
MPEG1.prototype.macroblockIntra = false;
MPEG1.prototype.macroblockMotFw = false;
MPEG1.prototype.motionFwH = 0;
MPEG1.prototype.motionFwV = 0;
MPEG1.prototype.motionFwHPrev = 0;
MPEG1.prototype.motionFwVPrev = 0;
MPEG1.prototype.decodeMacroblock = function() {
var increment = 0
, t = this.readHuffman(MPEG1.MACROBLOCK_ADDRESS_INCREMENT);
while (t === 34) {
t = this.readHuffman(MPEG1.MACROBLOCK_ADDRESS_INCREMENT)
}
while (t === 35) {
increment += 33;
t = this.readHuffman(MPEG1.MACROBLOCK_ADDRESS_INCREMENT)
}
increment += t;
if (this.sliceBegin) {
this.sliceBegin = false;
this.macroblockAddress += increment
} else {
if (this.macroblockAddress + increment >= this.mbSize) {
return
}
if (increment > 1) {
this.dcPredictorY = 128;
this.dcPredictorCr = 128;
this.dcPredictorCb = 128;
if (this.pictureType === MPEG1.PICTURE_TYPE.PREDICTIVE) {
this.motionFwH = this.motionFwHPrev = 0;
this.motionFwV = this.motionFwVPrev = 0
}
}
while (increment > 1) {
this.macroblockAddress++;
this.mbRow = this.macroblockAddress / this.mbWidth | 0;
this.mbCol = this.macroblockAddress % this.mbWidth;
this.copyMacroblock(this.motionFwH, this.motionFwV, this.forwardY, this.forwardCr, this.forwardCb);
increment--
}
this.macroblockAddress++
}
this.mbRow = this.macroblockAddress / this.mbWidth | 0;
this.mbCol = this.macroblockAddress % this.mbWidth;
var mbTable = MPEG1.MACROBLOCK_TYPE[this.pictureType];
this.macroblockType = this.readHuffman(mbTable);
this.macroblockIntra = this.macroblockType & 1;
this.macroblockMotFw = this.macroblockType & 8;
if ((this.macroblockType & 16) !== 0) {
this.quantizerScale = this.bits.read(5)
}
if (this.macroblockIntra) {
this.motionFwH = this.motionFwHPrev = 0;
this.motionFwV = this.motionFwVPrev = 0
} else {
this.dcPredictorY = 128;
this.dcPredictorCr = 128;
this.dcPredictorCb = 128;
this.decodeMotionVectors();
this.copyMacroblock(this.motionFwH, this.motionFwV, this.forwardY, this.forwardCr, this.forwardCb)
}
var cbp = (this.macroblockType & 2) !== 0 ? this.readHuffman(MPEG1.CODE_BLOCK_PATTERN) : this.macroblockIntra ? 63 : 0;
for (var block = 0, mask = 32; block < 6; block++) {
if ((cbp & mask) !== 0) {
this.decodeBlock(block)
}
mask >>= 1
}
}
;
MPEG1.prototype.decodeMotionVectors = function() {
var code, d, r = 0;
if (this.macroblockMotFw) {
code = this.readHuffman(MPEG1.MOTION);
if (code !== 0 && this.forwardF !== 1) {
r = this.bits.read(this.forwardRSize);
d = (Math.abs(code) - 1 << this.forwardRSize) + r + 1;
if (code < 0) {
d = -d
}
} else {
d = code
}
this.motionFwHPrev += d;
if (this.motionFwHPrev > (this.forwardF << 4) - 1) {
this.motionFwHPrev -= this.forwardF << 5
} else if (this.motionFwHPrev < -this.forwardF << 4) {
this.motionFwHPrev += this.forwardF << 5
}
this.motionFwH = this.motionFwHPrev;
if (this.fullPelForward) {
this.motionFwH <<= 1
}
code = this.readHuffman(MPEG1.MOTION);
if (code !== 0 && this.forwardF !== 1) {
r = this.bits.read(this.forwardRSize);
d = (Math.abs(code) - 1 << this.forwardRSize) + r + 1;
if (code < 0) {
d = -d
}
} else {
d = code
}
this.motionFwVPrev += d;
if (this.motionFwVPrev > (this.forwardF << 4) - 1) {
this.motionFwVPrev -= this.forwardF << 5
} else if (this.motionFwVPrev < -this.forwardF << 4) {
this.motionFwVPrev += this.forwardF << 5
}
this.motionFwV = this.motionFwVPrev;
if (this.fullPelForward) {
this.motionFwV <<= 1
}
} else if (this.pictureType === MPEG1.PICTURE_TYPE.PREDICTIVE) {
this.motionFwH = this.motionFwHPrev = 0;
this.motionFwV = this.motionFwVPrev = 0
}
}
;
MPEG1.prototype.copyMacroblock = function(motionH, motionV, sY, sCr, sCb) {
var width, scan, H, V, oddH, oddV, src, dest, last;
var dY = this.currentY32
, dCb = this.currentCb32
, dCr = this.currentCr32;
width = this.codedWidth;
scan = width - 16;
H = motionH >> 1;
V = motionV >> 1;
oddH = (motionH & 1) === 1;
oddV = (motionV & 1) === 1;
src = ((this.mbRow << 4) + V) * width + (this.mbCol << 4) + H;
dest = this.mbRow * width + this.mbCol << 2;
last = dest + (width << 2);
var x, y1, y2, y;
if (oddH) {
if (oddV) {
while (dest < last) {
y1 = sY[src] + sY[src + width];
src++;
for (x = 0; x < 4; x++) {
y2 = sY[src] + sY[src + width];
src++;
y = y1 + y2 + 2 >> 2 & 255;
y1 = sY[src] + sY[src + width];
src++;
y |= y1 + y2 + 2 << 6 & 65280;
y2 = sY[src] + sY[src + width];
src++;
y |= y1 + y2 + 2 << 14 & 16711680;
y1 = sY[src] + sY[src + width];
src++;
y |= y1 + y2 + 2 << 22 & 4278190080;
dY[dest++] = y
}
dest += scan >> 2;
src += scan - 1
}
} else {
while (dest < last) {
y1 = sY[src++];
for (x = 0; x < 4; x++) {
y2 = sY[src++];
y = y1 + y2 + 1 >> 1 & 255;
y1 = sY[src++];
y |= y1 + y2 + 1 << 7 & 65280;
y2 = sY[src++];
y |= y1 + y2 + 1 << 15 & 16711680;
y1 = sY[src++];
y |= y1 + y2 + 1 << 23 & 4278190080;
dY[dest++] = y
}
dest += scan >> 2;
src += scan - 1
}
}
} else {
if (oddV) {
while (dest < last) {
for (x = 0; x < 4; x++) {
y = sY[src] + sY[src + width] + 1 >> 1 & 255;
src++;
y |= sY[src] + sY[src + width] + 1 << 7 & 65280;
src++;
y |= sY[src] + sY[src + width] + 1 << 15 & 16711680;
src++;
y |= sY[src] + sY[src + width] + 1 << 23 & 4278190080;
src++;
dY[dest++] = y
}
dest += scan >> 2;
src += scan
}
} else {
while (dest < last) {
for (x = 0; x < 4; x++) {
y = sY[src];
src++;
y |= sY[src] << 8;
src++;
y |= sY[src] << 16;
src++;
y |= sY[src] << 24;
src++;
dY[dest++] = y
}
dest += scan >> 2;
src += scan
}
}
}
width = this.halfWidth;
scan = width - 8;
H = motionH / 2 >> 1;
V = motionV / 2 >> 1;
oddH = (motionH / 2 & 1) === 1;
oddV = (motionV / 2 & 1) === 1;
src = ((this.mbRow << 3) + V) * width + (this.mbCol << 3) + H;
dest = this.mbRow * width + this.mbCol << 1;
last = dest + (width << 1);
var cr1, cr2, cr, cb1, cb2, cb;
if (oddH) {
if (oddV) {
while (dest < last) {
cr1 = sCr[src] + sCr[src + width];
cb1 = sCb[src] + sCb[src + width];
src++;
for (x = 0; x < 2; x++) {
cr2 = sCr[src] + sCr[src + width];
cb2 = sCb[src] + sCb[src + width];
src++;
cr = cr1 + cr2 + 2 >> 2 & 255;
cb = cb1 + cb2 + 2 >> 2 & 255;
cr1 = sCr[src] + sCr[src + width];
cb1 = sCb[src] + sCb[src + width];
src++;
cr |= cr1 + cr2 + 2 << 6 & 65280;
cb |= cb1 + cb2 + 2 << 6 & 65280;
cr2 = sCr[src] + sCr[src + width];
cb2 = sCb[src] + sCb[src + width];
src++;
cr |= cr1 + cr2 + 2 << 14 & 16711680;
cb |= cb1 + cb2 + 2 << 14 & 16711680;
cr1 = sCr[src] + sCr[src + width];
cb1 = sCb[src] + sCb[src + width];
src++;
cr |= cr1 + cr2 + 2 << 22 & 4278190080;
cb |= cb1 + cb2 + 2 << 22 & 4278190080;
dCr[dest] = cr;
dCb[dest] = cb;
dest++
}
dest += scan >> 2;
src += scan - 1
}
} else {
while (dest < last) {
cr1 = sCr[src];
cb1 = sCb[src];
src++;
for (x = 0; x < 2; x++) {
cr2 = sCr[src];
cb2 = sCb[src++];
cr = cr1 + cr2 + 1 >> 1 & 255;
cb = cb1 + cb2 + 1 >> 1 & 255;
cr1 = sCr[src];
cb1 = sCb[src++];
cr |= cr1 + cr2 + 1 << 7 & 65280;
cb |= cb1 + cb2 + 1 << 7 & 65280;
cr2 = sCr[src];
cb2 = sCb[src++];
cr |= cr1 + cr2 + 1 << 15 & 16711680;
cb |= cb1 + cb2 + 1 << 15 & 16711680;
cr1 = sCr[src];
cb1 = sCb[src++];
cr |= cr1 + cr2 + 1 << 23 & 4278190080;
cb |= cb1 + cb2 + 1 << 23 & 4278190080;
dCr[dest] = cr;
dCb[dest] = cb;
dest++
}
dest += scan >> 2;
src += scan - 1
}
}
} else {
if (oddV) {
while (dest < last) {
for (x = 0; x < 2; x++) {
cr = sCr[src] + sCr[src + width] + 1 >> 1 & 255;
cb = sCb[src] + sCb[src + width] + 1 >> 1 & 255;
src++;
cr |= sCr[src] + sCr[src + width] + 1 << 7 & 65280;
cb |= sCb[src] + sCb[src + width] + 1 << 7 & 65280;
src++;
cr |= sCr[src] + sCr[src + width] + 1 << 15 & 16711680;
cb |= sCb[src] + sCb[src + width] + 1 << 15 & 16711680;
src++;
cr |= sCr[src] + sCr[src + width] + 1 << 23 & 4278190080;
cb |= sCb[src] + sCb[src + width] + 1 << 23 & 4278190080;
src++;
dCr[dest] = cr;
dCb[dest] = cb;
dest++
}
dest += scan >> 2;
src += scan
}
} else {
while (dest < last) {
for (x = 0; x < 2; x++) {
cr = sCr[src];
cb = sCb[src];
src++;
cr |= sCr[src] << 8;
cb |= sCb[src] << 8;
src++;
cr |= sCr[src] << 16;
cb |= sCb[src] << 16;
src++;
cr |= sCr[src] << 24;
cb |= sCb[src] << 24;
src++;
dCr[dest] = cr;
dCb[dest] = cb;
dest++
}
dest += scan >> 2;
src += scan
}
}
}
}
;
MPEG1.prototype.dcPredictorY = 0;
MPEG1.prototype.dcPredictorCr = 0;
MPEG1.prototype.dcPredictorCb = 0;
MPEG1.prototype.blockData = null;
MPEG1.prototype.decodeBlock = function(block) {
var n = 0, quantMatrix;
if (this.macroblockIntra) {
var predictor, dctSize;
if (block < 4) {
predictor = this.dcPredictorY;
dctSize = this.readHuffman(MPEG1.DCT_DC_SIZE_LUMINANCE)
} else {
predictor = block === 4 ? this.dcPredictorCr : this.dcPredictorCb;
dctSize = this.readHuffman(MPEG1.DCT_DC_SIZE_CHROMINANCE)
}
if (dctSize > 0) {
var differential = this.bits.read(dctSize);
if ((differential & 1 << dctSize - 1) !== 0) {
this.blockData[0] = predictor + differential
} else {
this.blockData[0] = predictor + (-1 << dctSize | differential + 1)
}
} else {
this.blockData[0] = predictor
}
if (block < 4) {
this.dcPredictorY = this.blockData[0]
} else if (block === 4) {
this.dcPredictorCr = this.blockData[0]
} else {
this.dcPredictorCb = this.blockData[0]
}
this.blockData[0] <<= 3 + 5;
quantMatrix = this.intraQuantMatrix;
n = 1
} else {
quantMatrix = this.nonIntraQuantMatrix
}
var level = 0;
while (true) {
var run = 0
, coeff = this.readHuffman(MPEG1.DCT_COEFF);
if (coeff === 1 && n > 0 && this.bits.read(1) === 0) {
break
}
if (coeff === 65535) {
run = this.bits.read(6);
level = this.bits.read(8);
if (level === 0) {
level = this.bits.read(8)
} else if (level === 128) {
level = this.bits.read(8) - 256
} else if (level > 128) {
level = level - 256
}
} else {
run = coeff >> 8;
level = coeff & 255;
if (this.bits.read(1)) {
level = -level
}
}
n += run;
var dezigZagged = MPEG1.ZIG_ZAG[n];
n++;
level <<= 1;
if (!this.macroblockIntra) {
level += level < 0 ? -1 : 1
}
level = level * this.quantizerScale * quantMatrix[dezigZagged] >> 4;
if ((level & 1) === 0) {
level -= level > 0 ? 1 : -1
}
if (level > 2047) {
level = 2047
} else if (level < -2048) {
level = -2048
}
this.blockData[dezigZagged] = level * MPEG1.PREMULTIPLIER_MATRIX[dezigZagged]
}
var destArray, destIndex, scan;
if (block < 4) {
destArray = this.currentY;
scan = this.codedWidth - 8;
destIndex = this.mbRow * this.codedWidth + this.mbCol << 4;
if ((block & 1) !== 0) {
destIndex += 8
}
if ((block & 2) !== 0) {
destIndex += this.codedWidth << 3
}
} else {
destArray = block === 4 ? this.currentCb : this.currentCr;
scan = (this.codedWidth >> 1) - 8;
destIndex = (this.mbRow * this.codedWidth << 2) + (this.mbCol << 3)
}
if (this.macroblockIntra) {
if (n === 1) {
MPEG1.CopyValueToDestination(this.blockData[0] + 128 >> 8, destArray, destIndex, scan);
this.blockData[0] = 0
} else {
MPEG1.IDCT(this.blockData);
MPEG1.CopyBlockToDestination(this.blockData, destArray, destIndex, scan);
JSMpeg.Fill(this.blockData, 0)
}
} else {
if (n === 1) {
MPEG1.AddValueToDestination(this.blockData[0] + 128 >> 8, destArray, destIndex, scan);
this.blockData[0] = 0
} else {
MPEG1.IDCT(this.blockData);
MPEG1.AddBlockToDestination(this.blockData, destArray, destIndex, scan);
JSMpeg.Fill(this.blockData, 0)
}
}
n = 0
}
;
MPEG1.CopyBlockToDestination = function(block, dest, index, scan) {
for (var n = 0; n < 64; n += 8,
index += scan + 8) {
dest[index + 0] = block[n + 0];
dest[index + 1] = block[n + 1];
dest[index + 2] = block[n + 2];
dest[index + 3] = block[n + 3];
dest[index + 4] = block[n + 4];
dest[index + 5] = block[n + 5];
dest[index + 6] = block[n + 6];
dest[index + 7] = block[n + 7]
}
}
;
MPEG1.AddBlockToDestination = function(block, dest, index, scan) {
for (var n = 0; n < 64; n += 8,
index += scan + 8) {
dest[index + 0] += block[n + 0];
dest[index + 1] += block[n + 1];
dest[index + 2] += block[n + 2];
dest[index + 3] += block[n + 3];
dest[index + 4] += block[n + 4];
dest[index + 5] += block[n + 5];
dest[index + 6] += block[n + 6];
dest[index + 7] += block[n + 7]
}
}
;
MPEG1.CopyValueToDestination = function(value, dest, index, scan) {
for (var n = 0; n < 64; n += 8,
index += scan + 8) {
dest[index + 0] = value;
dest[index + 1] = value;
dest[index + 2] = value;
dest[index + 3] = value;
dest[index + 4] = value;
dest[index + 5] = value;
dest[index + 6] = value;
dest[index + 7] = value
}
}
;
MPEG1.AddValueToDestination = function(value, dest, index, scan) {
for (var n = 0; n < 64; n += 8,
index += scan + 8) {
dest[index + 0] += value;
dest[index + 1] += value;
dest[index + 2] += value;
dest[index + 3] += value;
dest[index + 4] += value;
dest[index + 5] += value;
dest[index + 6] += value;
dest[index + 7] += value
}
}
;
MPEG1.IDCT = function(block) {
var b1, b3, b4, b6, b7, tmp1, tmp2, m0, x0, x1, x2, x3, x4, y3, y4, y5, y6, y7;
for (var i = 0; i < 8; ++i) {
b1 = block[4 * 8 + i];
b3 = block[2 * 8 + i] + block[6 * 8 + i];
b4 = block[5 * 8 + i] - block[3 * 8 + i];
tmp1 = block[1 * 8 + i] + block[7 * 8 + i];
tmp2 = block[3 * 8 + i] + block[5 * 8 + i];
b6 = block[1 * 8 + i] - block[7 * 8 + i];
b7 = tmp1 + tmp2;
m0 = block[0 * 8 + i];
x4 = (b6 * 473 - b4 * 196 + 128 >> 8) - b7;
x0 = x4 - ((tmp1 - tmp2) * 362 + 128 >> 8);
x1 = m0 - b1;
x2 = ((block[2 * 8 + i] - block[6 * 8 + i]) * 362 + 128 >> 8) - b3;
x3 = m0 + b1;
y3 = x1 + x2;
y4 = x3 + b3;
y5 = x1 - x2;
y6 = x3 - b3;
y7 = -x0 - (b4 * 473 + b6 * 196 + 128 >> 8);
block[0 * 8 + i] = b7 + y4;
block[1 * 8 + i] = x4 + y3;
block[2 * 8 + i] = y5 - x0;
block[3 * 8 + i] = y6 - y7;
block[4 * 8 + i] = y6 + y7;
block[5 * 8 + i] = x0 + y5;
block[6 * 8 + i] = y3 - x4;
block[7 * 8 + i] = y4 - b7
}
for (var i = 0; i < 64; i += 8) {
b1 = block[4 + i];
b3 = block[2 + i] + block[6 + i];
b4 = block[5 + i] - block[3 + i];
tmp1 = block[1 + i] + block[7 + i];
tmp2 = block[3 + i] + block[5 + i];
b6 = block[1 + i] - block[7 + i];
b7 = tmp1 + tmp2;
m0 = block[0 + i];
x4 = (b6 * 473 - b4 * 196 + 128 >> 8) - b7;
x0 = x4 - ((tmp1 - tmp2) * 362 + 128 >> 8);
x1 = m0 - b1;
x2 = ((block[2 + i] - block[6 + i]) * 362 + 128 >> 8) - b3;
x3 = m0 + b1;
y3 = x1 + x2;
y4 = x3 + b3;
y5 = x1 - x2;
y6 = x3 - b3;
y7 = -x0 - (b4 * 473 + b6 * 196 + 128 >> 8);
block[0 + i] = b7 + y4 + 128 >> 8;
block[1 + i] = x4 + y3 + 128 >> 8;
block[2 + i] = y5 - x0 + 128 >> 8;
block[3 + i] = y6 - y7 + 128 >> 8;
block[4 + i] = y6 + y7 + 128 >> 8;
block[5 + i] = x0 + y5 + 128 >> 8;
block[6 + i] = y3 - x4 + 128 >> 8;
block[7 + i] = y4 - b7 + 128 >> 8
}
}
;
MPEG1.PICTURE_RATE = [0, 23.976, 24, 25, 29.97, 30, 50, 59.94, 60, 0, 0, 0, 0, 0, 0, 0];
MPEG1.ZIG_ZAG = new Uint8Array([0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, 12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28, 35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51, 58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63]);
MPEG1.DEFAULT_INTRA_QUANT_MATRIX = new Uint8Array([8, 16, 19, 22, 26, 27, 29, 34, 16, 16, 22, 24, 27, 29, 34, 37, 19, 22, 26, 27, 29, 34, 34, 38, 22, 22, 26, 27, 29, 34, 37, 40, 22, 26, 27, 29, 32, 35, 40, 48, 26, 27, 29, 32, 35, 40, 48, 58, 26, 27, 29, 34, 38, 46, 56, 69, 27, 29, 35, 38, 46, 56, 69, 83]);
MPEG1.DEFAULT_NON_INTRA_QUANT_MATRIX = new Uint8Array([16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16]);
MPEG1.PREMULTIPLIER_MATRIX = new Uint8Array([32, 44, 42, 38, 32, 25, 17, 9, 44, 62, 58, 52, 44, 35, 24, 12, 42, 58, 55, 49, 42, 33, 23, 12, 38, 52, 49, 44, 38, 30, 20, 10, 32, 44, 42, 38, 32, 25, 17, 9, 25, 35, 33, 30, 25, 20, 14, 7, 17, 24, 23, 20, 17, 14, 9, 5, 9, 12, 12, 10, 9, 7, 5, 2]);
MPEG1.MACROBLOCK_ADDRESS_INCREMENT = new Int16Array([1 * 3, 2 * 3, 0, 3 * 3, 4 * 3, 0, 0, 0, 1, 5 * 3, 6 * 3, 0, 7 * 3, 8 * 3, 0, 9 * 3, 10 * 3, 0, 11 * 3, 12 * 3, 0, 0, 0, 3, 0, 0, 2, 13 * 3, 14 * 3, 0, 15 * 3, 16 * 3, 0, 0, 0, 5, 0, 0, 4, 17 * 3, 18 * 3, 0, 19 * 3, 20 * 3, 0, 0, 0, 7, 0, 0, 6, 21 * 3, 22 * 3, 0, 23 * 3, 24 * 3, 0, 25 * 3, 26 * 3, 0, 27 * 3, 28 * 3, 0, -1, 29 * 3, 0, -1, 30 * 3, 0, 31 * 3, 32 * 3, 0, 33 * 3, 34 * 3, 0, 35 * 3, 36 * 3, 0, 37 * 3, 38 * 3, 0, 0, 0, 9, 0, 0, 8, 39 * 3, 40 * 3, 0, 41 * 3, 42 * 3, 0, 43 * 3, 44 * 3, 0, 45 * 3, 46 * 3, 0, 0, 0, 15, 0, 0, 14, 0, 0, 13, 0, 0, 12, 0, 0, 11, 0, 0, 10, 47 * 3, -1, 0, -1, 48 * 3, 0, 49 * 3, 50 * 3, 0, 51 * 3, 52 * 3, 0, 53 * 3, 54 * 3, 0, 55 * 3, 56 * 3, 0, 57 * 3, 58 * 3, 0, 59 * 3, 60 * 3, 0, 61 * 3, -1, 0, -1, 62 * 3, 0, 63 * 3, 64 * 3, 0, 65 * 3, 66 * 3, 0, 67 * 3, 68 * 3, 0, 69 * 3, 70 * 3, 0, 71 * 3, 72 * 3, 0, 73 * 3, 74 * 3, 0, 0, 0, 21, 0, 0, 20, 0, 0, 19, 0, 0, 18, 0, 0, 17, 0, 0, 16, 0, 0, 35, 0, 0, 34, 0, 0, 33, 0, 0, 32, 0, 0, 31, 0, 0, 30, 0, 0, 29, 0, 0, 28, 0, 0, 27, 0, 0, 26, 0, 0, 25, 0, 0, 24, 0, 0, 23, 0, 0, 22]);
MPEG1.MACROBLOCK_TYPE_INTRA = new Int8Array([1 * 3, 2 * 3, 0, -1, 3 * 3, 0, 0, 0, 1, 0, 0, 17]);
MPEG1.MACROBLOCK_TYPE_PREDICTIVE = new Int8Array([1 * 3, 2 * 3, 0, 3 * 3, 4 * 3, 0, 0, 0, 10, 5 * 3, 6 * 3, 0, 0, 0, 2, 7 * 3, 8 * 3, 0, 0, 0, 8, 9 * 3, 10 * 3, 0, 11 * 3, 12 * 3, 0, -1, 13 * 3, 0, 0, 0, 18, 0, 0, 26, 0, 0, 1, 0, 0, 17]);
MPEG1.MACROBLOCK_TYPE_B = new Int8Array([1 * 3, 2 * 3, 0, 3 * 3, 5 * 3, 0, 4 * 3, 6 * 3, 0, 8 * 3, 7 * 3, 0, 0, 0, 12, 9 * 3, 10 * 3, 0, 0, 0, 14, 13 * 3, 14 * 3, 0, 12 * 3, 11 * 3, 0, 0, 0, 4, 0, 0, 6, 18 * 3, 16 * 3, 0, 15 * 3, 17 * 3, 0, 0, 0, 8, 0, 0, 10, -1, 19 * 3, 0, 0, 0, 1, 20 * 3, 21 * 3, 0, 0, 0, 30, 0, 0, 17, 0, 0, 22, 0, 0, 26]);
MPEG1.MACROBLOCK_TYPE = [null, MPEG1.MACROBLOCK_TYPE_INTRA, MPEG1.MACROBLOCK_TYPE_PREDICTIVE, MPEG1.MACROBLOCK_TYPE_B];
MPEG1.CODE_BLOCK_PATTERN = new Int16Array([2 * 3, 1 * 3, 0, 3 * 3, 6 * 3, 0, 4 * 3, 5 * 3, 0, 8 * 3, 11 * 3, 0, 12 * 3, 13 * 3, 0, 9 * 3, 7 * 3, 0, 10 * 3, 14 * 3, 0, 20 * 3, 19 * 3, 0, 18 * 3, 16 * 3, 0, 23 * 3, 17 * 3, 0, 27 * 3, 25 * 3, 0, 21 * 3, 28 * 3, 0, 15 * 3, 22 * 3, 0, 24 * 3, 26 * 3, 0, 0, 0, 60, 35 * 3, 40 * 3, 0, 44 * 3, 48 * 3, 0, 38 * 3, 36 * 3, 0, 42 * 3, 47 * 3, 0, 29 * 3, 31 * 3, 0, 39 * 3, 32 * 3, 0, 0, 0, 32, 45 * 3, 46 * 3, 0, 33 * 3, 41 * 3, 0, 43 * 3, 34 * 3, 0, 0, 0, 4, 30 * 3, 37 * 3, 0, 0, 0, 8, 0, 0, 16, 0, 0, 44, 50 * 3, 56 * 3, 0, 0, 0, 28, 0, 0, 52, 0, 0, 62, 61 * 3, 59 * 3, 0, 52 * 3, 60 * 3, 0, 0, 0, 1, 55 * 3, 54 * 3, 0, 0, 0, 61, 0, 0, 56, 57 * 3, 58 * 3, 0, 0, 0, 2, 0, 0, 40, 51 * 3, 62 * 3, 0, 0, 0, 48, 64 * 3, 63 * 3, 0, 49 * 3, 53 * 3, 0, 0, 0, 20, 0, 0, 12, 80 * 3, 83 * 3, 0, 0, 0, 63, 77 * 3, 75 * 3, 0, 65 * 3, 73 * 3, 0, 84 * 3, 66 * 3, 0, 0, 0, 24, 0, 0, 36, 0, 0, 3, 69 * 3, 87 * 3, 0, 81 * 3, 79 * 3, 0, 68 * 3, 71 * 3, 0, 70 * 3, 78 * 3, 0, 67 * 3, 76 * 3, 0, 72 * 3, 74 * 3, 0, 86 * 3, 85 * 3, 0, 88 * 3, 82 * 3, 0, -1, 94 * 3, 0, 95 * 3, 97 * 3, 0, 0, 0, 33, 0, 0, 9, 106 * 3, 110 * 3, 0, 102 * 3, 116 * 3, 0, 0, 0, 5, 0, 0, 10, 93 * 3, 89 * 3, 0, 0, 0, 6, 0, 0, 18, 0, 0, 17, 0, 0, 34, 113 * 3, 119 * 3, 0, 103 * 3, 104 * 3, 0, 90 * 3, 92 * 3, 0, 109 * 3, 107 * 3, 0, 117 * 3, 118 * 3, 0, 101 * 3, 99 * 3, 0, 98 * 3, 96 * 3, 0, 100 * 3, 91 * 3, 0, 114 * 3, 115 * 3, 0, 105 * 3, 108 * 3, 0, 112 * 3, 111 * 3, 0, 121 * 3, 125 * 3, 0, 0, 0, 41, 0, 0, 14, 0, 0, 21, 124 * 3, 122 * 3, 0, 120 * 3, 123 * 3, 0, 0, 0, 11, 0, 0, 19, 0, 0, 7, 0, 0, 35, 0, 0, 13, 0, 0, 50, 0, 0, 49, 0, 0, 58, 0, 0, 37, 0, 0, 25, 0, 0, 45, 0, 0, 57, 0, 0, 26, 0, 0, 29, 0, 0, 38, 0, 0, 53, 0, 0, 23, 0, 0, 43, 0, 0, 46, 0, 0, 42, 0, 0, 22, 0, 0, 54, 0, 0, 51, 0, 0, 15, 0, 0, 30, 0, 0, 39, 0, 0, 47, 0, 0, 55, 0, 0, 27, 0, 0, 59, 0, 0, 31]);
MPEG1.MOTION = new Int16Array([1 * 3, 2 * 3, 0, 4 * 3, 3 * 3, 0, 0, 0, 0, 6 * 3, 5 * 3, 0, 8 * 3, 7 * 3, 0, 0, 0, -1, 0, 0, 1, 9 * 3, 10 * 3, 0, 12 * 3, 11 * 3, 0, 0, 0, 2, 0, 0, -2, 14 * 3, 15 * 3, 0, 16 * 3, 13 * 3, 0, 20 * 3, 18 * 3, 0, 0, 0, 3, 0, 0, -3, 17 * 3, 19 * 3, 0, -1, 23 * 3, 0, 27 * 3, 25 * 3, 0, 26 * 3, 21 * 3, 0, 24 * 3, 22 * 3, 0, 32 * 3, 28 * 3, 0, 29 * 3, 31 * 3, 0, -1, 33 * 3, 0, 36 * 3, 35 * 3, 0, 0, 0, -4, 30 * 3, 34 * 3, 0, 0, 0, 4, 0, 0, -7, 0, 0, 5, 37 * 3, 41 * 3, 0, 0, 0, -5, 0, 0, 7, 38 * 3, 40 * 3, 0, 42 * 3, 39 * 3, 0, 0, 0, -6, 0, 0, 6, 51 * 3, 54 * 3, 0, 50 * 3, 49 * 3, 0, 45 * 3, 46 * 3, 0, 52 * 3, 47 * 3, 0, 43 * 3, 53 * 3, 0, 44 * 3, 48 * 3, 0, 0, 0, 10, 0, 0, 9, 0, 0, 8, 0, 0, -8, 57 * 3, 66 * 3, 0, 0, 0, -9, 60 * 3, 64 * 3, 0, 56 * 3, 61 * 3, 0, 55 * 3, 62 * 3, 0, 58 * 3, 63 * 3, 0, 0, 0, -10, 59 * 3, 65 * 3, 0, 0, 0, 12, 0, 0, 16, 0, 0, 13, 0, 0, 14, 0, 0, 11, 0, 0, 15, 0, 0, -16, 0, 0, -12, 0, 0, -14, 0, 0, -15, 0, 0, -11, 0, 0, -13]);
MPEG1.DCT_DC_SIZE_LUMINANCE = new Int8Array([2 * 3, 1 * 3, 0, 6 * 3, 5 * 3, 0, 3 * 3, 4 * 3, 0, 0, 0, 1, 0, 0, 2, 9 * 3, 8 * 3, 0, 7 * 3, 10 * 3, 0, 0, 0, 0, 12 * 3, 11 * 3, 0, 0, 0, 4, 0, 0, 3, 13 * 3, 14 * 3, 0, 0, 0, 5, 0, 0, 6, 16 * 3, 15 * 3, 0, 17 * 3, -1, 0, 0, 0, 7, 0, 0, 8]);
MPEG1.DCT_DC_SIZE_CHROMINANCE = new Int8Array([2 * 3, 1 * 3, 0, 4 * 3, 3 * 3, 0, 6 * 3, 5 * 3, 0, 8 * 3, 7 * 3, 0, 0, 0, 2, 0, 0, 1, 0, 0, 0, 10 * 3, 9 * 3, 0, 0, 0, 3, 12 * 3, 11 * 3, 0, 0, 0, 4, 14 * 3, 13 * 3, 0, 0, 0, 5, 16 * 3, 15 * 3, 0, 0, 0, 6, 17 * 3, -1, 0, 0, 0, 7, 0, 0, 8]);
MPEG1.DCT_COEFF = new Int32Array([1 * 3, 2 * 3, 0, 4 * 3, 3 * 3, 0, 0, 0, 1, 7 * 3, 8 * 3, 0, 6 * 3, 5 * 3, 0, 13 * 3, 9 * 3, 0, 11 * 3, 10 * 3, 0, 14 * 3, 12 * 3, 0, 0, 0, 257, 20 * 3, 22 * 3, 0, 18 * 3, 21 * 3, 0, 16 * 3, 19 * 3, 0, 0, 0, 513, 17 * 3, 15 * 3, 0, 0, 0, 2, 0, 0, 3, 27 * 3, 25 * 3, 0, 29 * 3, 31 * 3, 0, 24 * 3, 26 * 3, 0, 32 * 3, 30 * 3, 0, 0, 0, 1025, 23 * 3, 28 * 3, 0, 0, 0, 769, 0, 0, 258, 0, 0, 1793, 0, 0, 65535, 0, 0, 1537, 37 * 3, 36 * 3, 0, 0, 0, 1281, 35 * 3, 34 * 3, 0, 39 * 3, 38 * 3, 0, 33 * 3, 42 * 3, 0, 40 * 3, 41 * 3, 0, 52 * 3, 50 * 3, 0, 54 * 3, 53 * 3, 0, 48 * 3, 49 * 3, 0, 43 * 3, 45 * 3, 0, 46 * 3, 44 * 3, 0, 0, 0, 2049, 0, 0, 4, 0, 0, 514, 0, 0, 2305, 51 * 3, 47 * 3, 0, 55 * 3, 57 * 3, 0, 60 * 3, 56 * 3, 0, 59 * 3, 58 * 3, 0, 61 * 3, 62 * 3, 0, 0, 0, 2561, 0, 0, 3329, 0, 0, 6, 0, 0, 259, 0, 0, 5, 0, 0, 770, 0, 0, 2817, 0, 0, 3073, 76 * 3, 75 * 3, 0, 67 * 3, 70 * 3, 0, 73 * 3, 71 * 3, 0, 78 * 3, 74 * 3, 0, 72 * 3, 77 * 3, 0, 69 * 3, 64 * 3, 0, 68 * 3, 63 * 3, 0, 66 * 3, 65 * 3, 0, 81 * 3, 87 * 3, 0, 91 * 3, 80 * 3, 0, 82 * 3, 79 * 3, 0, 83 * 3, 86 * 3, 0, 93 * 3, 92 * 3, 0, 84 * 3, 85 * 3, 0, 90 * 3, 94 * 3, 0, 88 * 3, 89 * 3, 0, 0, 0, 515, 0, 0, 260, 0, 0, 7, 0, 0, 1026, 0, 0, 1282, 0, 0, 4097, 0, 0, 3841, 0, 0, 3585, 105 * 3, 107 * 3, 0, 111 * 3, 114 * 3, 0, 104 * 3, 97 * 3, 0, 125 * 3, 119 * 3, 0, 96 * 3, 98 * 3, 0, -1, 123 * 3, 0, 95 * 3, 101 * 3, 0, 106 * 3, 121 * 3, 0, 99 * 3, 102 * 3, 0, 113 * 3, 103 * 3, 0, 112 * 3, 116 * 3, 0, 110 * 3, 100 * 3, 0, 124 * 3, 115 * 3, 0, 117 * 3, 122 * 3, 0, 109 * 3, 118 * 3, 0, 120 * 3, 108 * 3, 0, 127 * 3, 136 * 3, 0, 139 * 3, 140 * 3, 0, 130 * 3, 126 * 3, 0, 145 * 3, 146 * 3, 0, 128 * 3, 129 * 3, 0, 0, 0, 2050, 132 * 3, 134 * 3, 0, 155 * 3, 154 * 3, 0, 0, 0, 8, 137 * 3, 133 * 3, 0, 143 * 3, 144 * 3, 0, 151 * 3, 138 * 3, 0, 142 * 3, 141 * 3, 0, 0, 0, 10, 0, 0, 9, 0, 0, 11, 0, 0, 5377, 0, 0, 1538, 0, 0, 771, 0, 0, 5121, 0, 0, 1794, 0, 0, 4353, 0, 0, 4609, 0, 0, 4865, 148 * 3, 152 * 3, 0, 0, 0, 1027, 153 * 3, 150 * 3, 0, 0, 0, 261, 131 * 3, 135 * 3, 0, 0, 0, 516, 149 * 3, 147 * 3, 0, 172 * 3, 173 * 3, 0, 162 * 3, 158 * 3, 0, 170 * 3, 161 * 3, 0, 168 * 3, 166 * 3, 0, 157 * 3, 179 * 3, 0, 169 * 3, 167 * 3, 0, 174 * 3, 171 * 3, 0, 178 * 3, 177 * 3, 0, 156 * 3, 159 * 3, 0, 164 * 3, 165 * 3, 0, 183 * 3, 182 * 3, 0, 175 * 3, 176 * 3, 0, 0, 0, 263, 0, 0, 2562, 0, 0, 2306, 0, 0, 5633, 0, 0, 5889, 0, 0, 6401, 0, 0, 6145, 0, 0, 1283, 0, 0, 772, 0, 0, 13, 0, 0, 12, 0, 0, 14, 0, 0, 15, 0, 0, 517, 0, 0, 6657, 0, 0, 262, 180 * 3, 181 * 3, 0, 160 * 3, 163 * 3, 0, 196 * 3, 199 * 3, 0, 0, 0, 27, 203 * 3, 185 * 3, 0, 202 * 3, 201 * 3, 0, 0, 0, 19, 0, 0, 22, 197 * 3, 207 * 3, 0, 0, 0, 18, 191 * 3, 192 * 3, 0, 188 * 3, 190 * 3, 0, 0, 0, 20, 184 * 3, 194 * 3, 0, 0, 0, 21, 186 * 3, 193 * 3, 0, 0, 0, 23, 204 * 3, 198 * 3, 0, 0, 0, 25, 0, 0, 24, 200 * 3, 205 * 3, 0, 0, 0, 31, 0, 0, 30, 0, 0, 28, 0, 0, 29, 0, 0, 26, 0, 0, 17, 0, 0, 16, 189 * 3, 206 * 3, 0, 187 * 3, 195 * 3, 0, 218 * 3, 211 * 3, 0, 0, 0, 37, 215 * 3, 216 * 3, 0, 0, 0, 36, 210 * 3, 212 * 3, 0, 0, 0, 34, 213 * 3, 209 * 3, 0, 221 * 3, 222 * 3, 0, 219 * 3, 208 * 3, 0, 217 * 3, 214 * 3, 0, 223 * 3, 220 * 3, 0, 0, 0, 35, 0, 0, 267, 0, 0, 40, 0, 0, 268, 0, 0, 266, 0, 0, 32, 0, 0, 264, 0, 0, 265, 0, 0, 38, 0, 0, 269, 0, 0, 270, 0, 0, 33, 0, 0, 39, 0, 0, 7937, 0, 0, 6913, 0, 0, 7681, 0, 0, 4098, 0, 0, 7425, 0, 0, 7169, 0, 0, 271, 0, 0, 274, 0, 0, 273, 0, 0, 272, 0, 0, 1539, 0, 0, 2818, 0, 0, 3586, 0, 0, 3330, 0, 0, 3074, 0, 0, 3842]);
MPEG1.PICTURE_TYPE = {
INTRA: 1,
PREDICTIVE: 2,
B: 3
};
MPEG1.START = {
SEQUENCE: 179,
SLICE_FIRST: 1,
SLICE_LAST: 175,
PICTURE: 0,
EXTENSION: 181,
USER_DATA: 178
};
return MPEG1
}();
JSMpeg.Decoder.MP2Audio = function() {
"use strict";
var MP2 = function(options) {
JSMpeg.Decoder.Base.call(this, options);
var bufferSize = options.audioBufferSize || 128 * 1024;
var bufferMode = options.streaming ? JSMpeg.BitBuffer.MODE.EVICT : JSMpeg.BitBuffer.MODE.EXPAND;
this.bits = new JSMpeg.BitBuffer(bufferSize,bufferMode);
this.left = new Float32Array(1152);
this.right = new Float32Array(1152);
this.sampleRate = 44100;
this.D = new Float32Array(1024);
this.D.set(MP2.SYNTHESIS_WINDOW, 0);
this.D.set(MP2.SYNTHESIS_WINDOW, 512);
this.V = new Float32Array(1024);
this.U = new Int32Array(32);
this.VPos = 0;
this.allocation = [new Array(32), new Array(32)];
this.scaleFactorInfo = [new Uint8Array(32), new Uint8Array(32)];
this.scaleFactor = [new Array(32), new Array(32)];
this.sample = [new Array(32), new Array(32)];
for (var j = 0; j < 2; j++) {
for (var i = 0; i < 32; i++) {
this.scaleFactor[j][i] = [0, 0, 0];
this.sample[j][i] = [0, 0, 0]
}
}
};
MP2.prototype = Object.create(JSMpeg.Decoder.Base.prototype);
MP2.prototype.constructor = MP2;
MP2.prototype.decode = function() {
var pos = this.bits.index >> 3;
if (pos >= this.bits.byteLength) {
return false
}
var decoded = this.decodeFrame(this.left, this.right);
this.bits.index = pos + decoded << 3;
if (!decoded) {
return false
}
if (this.destination) {
this.destination.play(this.sampleRate, this.left, this.right)
}
this.advanceDecodedTime(this.left.length / this.sampleRate);
return true
}
;
MP2.prototype.getCurrentTime = function() {
var enqueuedTime = this.destination ? this.destination.enqueuedTime : 0;
return this.decodedTime - enqueuedTime
}
;
MP2.prototype.decodeFrame = function(left, right) {
var sync = this.bits.read(11)
, version = this.bits.read(2)
, layer = this.bits.read(2)
, hasCRC = !this.bits.read(1);
if (sync !== MP2.FRAME_SYNC || version !== MP2.VERSION.MPEG_1 || layer !== MP2.LAYER.II) {
return 0
}
var bitrateIndex = this.bits.read(4) - 1;
if (bitrateIndex > 13) {
return 0
}
var sampleRateIndex = this.bits.read(2);
var sampleRate = MP2.SAMPLE_RATE[sampleRateIndex];
if (sampleRateIndex === 3) {
return 0
}
if (version === MP2.VERSION.MPEG_2) {
sampleRateIndex += 4;
bitrateIndex += 14
}
var padding = this.bits.read(1)
, privat = this.bits.read(1)
, mode = this.bits.read(2);
var bound = 0;
if (mode === MP2.MODE.JOINT_STEREO) {
bound = this.bits.read(2) + 1 << 2
} else {
this.bits.skip(2);
bound = mode === MP2.MODE.MONO ? 0 : 32
}
this.bits.skip(4);
if (hasCRC) {
this.bits.skip(16)
}
var bitrate = MP2.BIT_RATE[bitrateIndex]
, sampleRate = MP2.SAMPLE_RATE[sampleRateIndex]
, frameSize = 144e3 * bitrate / sampleRate + padding | 0;
var tab3 = 0;
var sblimit = 0;
if (version === MP2.VERSION.MPEG_2) {
tab3 = 2;
sblimit = 30
} else {
var tab1 = mode === MP2.MODE.MONO ? 0 : 1;
var tab2 = MP2.QUANT_LUT_STEP_1[tab1][bitrateIndex];
tab3 = MP2.QUANT_LUT_STEP_2[tab2][sampleRateIndex];
sblimit = tab3 & 63;
tab3 >>= 6
}
if (bound > sblimit) {
bound = sblimit
}
for (var sb = 0; sb < bound; sb++) {
this.allocation[0][sb] = this.readAllocation(sb, tab3);
this.allocation[1][sb] = this.readAllocation(sb, tab3)
}
for (var sb = bound; sb < sblimit; sb++) {
this.allocation[0][sb] = this.allocation[1][sb] = this.readAllocation(sb, tab3)
}
var channels = mode === MP2.MODE.MONO ? 1 : 2;
for (var sb = 0; sb < sblimit; sb++) {
for (ch = 0; ch < channels; ch++) {
if (this.allocation[ch][sb]) {
this.scaleFactorInfo[ch][sb] = this.bits.read(2)
}
}
if (mode === MP2.MODE.MONO) {
this.scaleFactorInfo[1][sb] = this.scaleFactorInfo[0][sb]
}
}
for (var sb = 0; sb < sblimit; sb++) {
for (var ch = 0; ch < channels; ch++) {
if (this.allocation[ch][sb]) {
var sf = this.scaleFactor[ch][sb];
switch (this.scaleFactorInfo[ch][sb]) {
case 0:
sf[0] = this.bits.read(6);
sf[1] = this.bits.read(6);
sf[2] = this.bits.read(6);
break;
case 1:
sf[0] = sf[1] = this.bits.read(6);
sf[2] = this.bits.read(6);
break;
case 2:
sf[0] = sf[1] = sf[2] = this.bits.read(6);
break;
case 3:
sf[0] = this.bits.read(6);
sf[1] = sf[2] = this.bits.read(6);
break
}
}
}
if (mode === MP2.MODE.MONO) {
this.scaleFactor[1][sb][0] = this.scaleFactor[0][sb][0];
this.scaleFactor[1][sb][1] = this.scaleFactor[0][sb][1];
this.scaleFactor[1][sb][2] = this.scaleFactor[0][sb][2]
}
}
var outPos = 0;
for (var part = 0; part < 3; part++) {
for (var granule = 0; granule < 4; granule++) {
for (var sb = 0; sb < bound; sb++) {
this.readSamples(0, sb, part);
this.readSamples(1, sb, part)
}
for (var sb = bound; sb < sblimit; sb++) {
this.readSamples(0, sb, part);
this.sample[1][sb][0] = this.sample[0][sb][0];
this.sample[1][sb][1] = this.sample[0][sb][1];
this.sample[1][sb][2] = this.sample[0][sb][2]
}
for (var sb = sblimit; sb < 32; sb++) {
this.sample[0][sb][0] = 0;
this.sample[0][sb][1] = 0;
this.sample[0][sb][2] = 0;
this.sample[1][sb][0] = 0;
this.sample[1][sb][1] = 0;
this.sample[1][sb][2] = 0
}
for (var p = 0; p < 3; p++) {
this.VPos = this.VPos - 64 & 1023;
for (var ch = 0; ch < 2; ch++) {
MP2.MatrixTransform(this.sample[ch], p, this.V, this.VPos);
JSMpeg.Fill(this.U, 0);
var dIndex = 512 - (this.VPos >> 1);
var vIndex = this.VPos % 128 >> 1;
while (vIndex < 1024) {
for (var i = 0; i < 32; ++i) {
this.U[i] += this.D[dIndex++] * this.V[vIndex++]
}
vIndex += 128 - 32;
dIndex += 64 - 32
}
vIndex = 128 - 32 + 1024 - vIndex;
dIndex -= 512 - 32;
while (vIndex < 1024) {
for (var i = 0; i < 32; ++i) {
this.U[i] += this.D[dIndex++] * this.V[vIndex++]
}
vIndex += 128 - 32;
dIndex += 64 - 32
}
var outChannel = ch === 0 ? left : right;
for (var j = 0; j < 32; j++) {
outChannel[outPos + j] = this.U[j] / 2147418112
}
}
outPos += 32
}
}
}
this.sampleRate = sampleRate;
return frameSize
}
;
MP2.prototype.readAllocation = function(sb, tab3) {
var tab4 = MP2.QUANT_LUT_STEP_3[tab3][sb];
var qtab = MP2.QUANT_LUT_STEP4[tab4 & 15][this.bits.read(tab4 >> 4)];
return qtab ? MP2.QUANT_TAB[qtab - 1] : 0
}
;
MP2.prototype.readSamples = function(ch, sb, part) {
var q = this.allocation[ch][sb]
, sf = this.scaleFactor[ch][sb][part]
, sample = this.sample[ch][sb]
, val = 0;
if (!q) {
sample[0] = sample[1] = sample[2] = 0;
return
}
if (sf === 63) {
sf = 0
} else {
var shift = sf / 3 | 0;
sf = MP2.SCALEFACTOR_BASE[sf % 3] + (1 << shift >> 1) >> shift
}
var adj = q.levels;
if (q.group) {
val = this.bits.read(q.bits);
sample[0] = val % adj;
val = val / adj | 0;
sample[1] = val % adj;
sample[2] = val / adj | 0
} else {
sample[0] = this.bits.read(q.bits);
sample[1] = this.bits.read(q.bits);
sample[2] = this.bits.read(q.bits)
}
var scale = 65536 / (adj + 1) | 0;
adj = (adj + 1 >> 1) - 1;
val = (adj - sample[0]) * scale;
sample[0] = val * (sf >> 12) + (val * (sf & 4095) + 2048 >> 12) >> 12;
val = (adj - sample[1]) * scale;
sample[1] = val * (sf >> 12) + (val * (sf & 4095) + 2048 >> 12) >> 12;
val = (adj - sample[2]) * scale;
sample[2] = val * (sf >> 12) + (val * (sf & 4095) + 2048 >> 12) >> 12
}
;
MP2.MatrixTransform = function(s, ss, d, dp) {
var t01, t02, t03, t04, t05, t06, t07, t08, t09, t10, t11, t12, t13, t14, t15, t16, t17, t18, t19, t20, t21, t22, t23, t24, t25, t26, t27, t28, t29, t30, t31, t32, t33;
t01 = s[0][ss] + s[31][ss];
t02 = (s[0][ss] - s[31][ss]) * .500602998235;
t03 = s[1][ss] + s[30][ss];
t04 = (s[1][ss] - s[30][ss]) * .505470959898;
t05 = s[2][ss] + s[29][ss];
t06 = (s[2][ss] - s[29][ss]) * .515447309923;
t07 = s[3][ss] + s[28][ss];
t08 = (s[3][ss] - s[28][ss]) * .53104259109;
t09 = s[4][ss] + s[27][ss];
t10 = (s[4][ss] - s[27][ss]) * .553103896034;
t11 = s[5][ss] + s[26][ss];
t12 = (s[5][ss] - s[26][ss]) * .582934968206;
t13 = s[6][ss] + s[25][ss];
t14 = (s[6][ss] - s[25][ss]) * .622504123036;
t15 = s[7][ss] + s[24][ss];
t16 = (s[7][ss] - s[24][ss]) * .674808341455;
t17 = s[8][ss] + s[23][ss];
t18 = (s[8][ss] - s[23][ss]) * .744536271002;
t19 = s[9][ss] + s[22][ss];
t20 = (s[9][ss] - s[22][ss]) * .839349645416;
t21 = s[10][ss] + s[21][ss];
t22 = (s[10][ss] - s[21][ss]) * .972568237862;
t23 = s[11][ss] + s[20][ss];
t24 = (s[11][ss] - s[20][ss]) * 1.16943993343;
t25 = s[12][ss] + s[19][ss];
t26 = (s[12][ss] - s[19][ss]) * 1.48416461631;
t27 = s[13][ss] + s[18][ss];
t28 = (s[13][ss] - s[18][ss]) * 2.05778100995;
t29 = s[14][ss] + s[17][ss];
t30 = (s[14][ss] - s[17][ss]) * 3.40760841847;
t31 = s[15][ss] + s[16][ss];
t32 = (s[15][ss] - s[16][ss]) * 10.1900081235;
t33 = t01 + t31;
t31 = (t01 - t31) * .502419286188;
t01 = t03 + t29;
t29 = (t03 - t29) * .52249861494;
t03 = t05 + t27;
t27 = (t05 - t27) * .566944034816;
t05 = t07 + t25;
t25 = (t07 - t25) * .64682178336;
t07 = t09 + t23;
t23 = (t09 - t23) * .788154623451;
t09 = t11 + t21;
t21 = (t11 - t21) * 1.06067768599;
t11 = t13 + t19;
t19 = (t13 - t19) * 1.72244709824;
t13 = t15 + t17;
t17 = (t15 - t17) * 5.10114861869;
t15 = t33 + t13;
t13 = (t33 - t13) * .509795579104;
t33 = t01 + t11;
t01 = (t01 - t11) * .601344886935;
t11 = t03 + t09;
t09 = (t03 - t09) * .899976223136;
t03 = t05 + t07;
t07 = (t05 - t07) * 2.56291544774;
t05 = t15 + t03;
t15 = (t15 - t03) * .541196100146;
t03 = t33 + t11;
t11 = (t33 - t11) * 1.30656296488;
t33 = t05 + t03;
t05 = (t05 - t03) * .707106781187;
t03 = t15 + t11;
t15 = (t15 - t11) * .707106781187;
t03 += t15;
t11 = t13 + t07;
t13 = (t13 - t07) * .541196100146;
t07 = t01 + t09;
t09 = (t01 - t09) * 1.30656296488;
t01 = t11 + t07;
t07 = (t11 - t07) * .707106781187;
t11 = t13 + t09;
t13 = (t13 - t09) * .707106781187;
t11 += t13;
t01 += t11;
t11 += t07;
t07 += t13;
t09 = t31 + t17;
t31 = (t31 - t17) * .509795579104;
t17 = t29 + t19;
t29 = (t29 - t19) * .601344886935;
t19 = t27 + t21;
t21 = (t27 - t21) * .899976223136;
t27 = t25 + t23;
t23 = (t25 - t23) * 2.56291544774;
t25 = t09 + t27;
t09 = (t09 - t27) * .541196100146;
t27 = t17 + t19;
t19 = (t17 - t19) * 1.30656296488;
t17 = t25 + t27;
t27 = (t25 - t27) * .707106781187;
t25 = t09 + t19;
t19 = (t09 - t19) * .707106781187;
t25 += t19;
t09 = t31 + t23;
t31 = (t31 - t23) * .541196100146;
t23 = t29 + t21;
t21 = (t29 - t21) * 1.30656296488;
t29 = t09 + t23;
t23 = (t09 - t23) * .707106781187;
t09 = t31 + t21;
t31 = (t31 - t21) * .707106781187;
t09 += t31;
t29 += t09;
t09 += t23;
t23 += t31;
t17 += t29;
t29 += t25;
t25 += t09;
t09 += t27;
t27 += t23;
t23 += t19;
t19 += t31;
t21 = t02 + t32;
t02 = (t02 - t32) * .502419286188;
t32 = t04 + t30;
t04 = (t04 - t30) * .52249861494;
t30 = t06 + t28;
t28 = (t06 - t28) * .566944034816;
t06 = t08 + t26;
t08 = (t08 - t26) * .64682178336;
t26 = t10 + t24;
t10 = (t10 - t24) * .788154623451;
t24 = t12 + t22;
t22 = (t12 - t22) * 1.06067768599;
t12 = t14 + t20;
t20 = (t14 - t20) * 1.72244709824;
t14 = t16 + t18;
t16 = (t16 - t18) * 5.10114861869;
t18 = t21 + t14;
t14 = (t21 - t14) * .509795579104;
t21 = t32 + t12;
t32 = (t32 - t12) * .601344886935;
t12 = t30 + t24;
t24 = (t30 - t24) * .899976223136;
t30 = t06 + t26;
t26 = (t06 - t26) * 2.56291544774;
t06 = t18 + t30;
t18 = (t18 - t30) * .541196100146;
t30 = t21 + t12;
t12 = (t21 - t12) * 1.30656296488;
t21 = t06 + t30;
t30 = (t06 - t30) * .707106781187;
t06 = t18 + t12;
t12 = (t18 - t12) * .707106781187;
t06 += t12;
t18 = t14 + t26;
t26 = (t14 - t26) * .541196100146;
t14 = t32 + t24;
t24 = (t32 - t24) * 1.30656296488;
t32 = t18 + t14;
t14 = (t18 - t14) * .707106781187;
t18 = t26 + t24;
t24 = (t26 - t24) * .707106781187;
t18 += t24;
t32 += t18;
t18 += t14;
t26 = t14 + t24;
t14 = t02 + t16;
t02 = (t02 - t16) * .509795579104;
t16 = t04 + t20;
t04 = (t04 - t20) * .601344886935;
t20 = t28 + t22;
t22 = (t28 - t22) * .899976223136;
t28 = t08 + t10;
t10 = (t08 - t10) * 2.56291544774;
t08 = t14 + t28;
t14 = (t14 - t28) * .541196100146;
t28 = t16 + t20;
t20 = (t16 - t20) * 1.30656296488;
t16 = t08 + t28;
t28 = (t08 - t28) * .707106781187;
t08 = t14 + t20;
t20 = (t14 - t20) * .707106781187;
t08 += t20;
t14 = t02 + t10;
t02 = (t02 - t10) * .541196100146;
t10 = t04 + t22;
t22 = (t04 - t22) * 1.30656296488;
t04 = t14 + t10;
t10 = (t14 - t10) * .707106781187;
t14 = t02 + t22;
t02 = (t02 - t22) * .707106781187;
t14 += t02;
t04 += t14;
t14 += t10;
t10 += t02;
t16 += t04;
t04 += t08;
t08 += t14;
t14 += t28;
t28 += t10;
t10 += t20;
t20 += t02;
t21 += t16;
t16 += t32;
t32 += t04;
t04 += t06;
t06 += t08;
t08 += t18;
t18 += t14;
t14 += t30;
t30 += t28;
t28 += t26;
t26 += t10;
t10 += t12;
t12 += t20;
t20 += t24;
t24 += t02;
d[dp + 48] = -t33;
d[dp + 49] = d[dp + 47] = -t21;
d[dp + 50] = d[dp + 46] = -t17;
d[dp + 51] = d[dp + 45] = -t16;
d[dp + 52] = d[dp + 44] = -t01;
d[dp + 53] = d[dp + 43] = -t32;
d[dp + 54] = d[dp + 42] = -t29;
d[dp + 55] = d[dp + 41] = -t04;
d[dp + 56] = d[dp + 40] = -t03;
d[dp + 57] = d[dp + 39] = -t06;
d[dp + 58] = d[dp + 38] = -t25;
d[dp + 59] = d[dp + 37] = -t08;
d[dp + 60] = d[dp + 36] = -t11;
d[dp + 61] = d[dp + 35] = -t18;
d[dp + 62] = d[dp + 34] = -t09;
d[dp + 63] = d[dp + 33] = -t14;
d[dp + 32] = -t05;
d[dp + 0] = t05;
d[dp + 31] = -t30;
d[dp + 1] = t30;
d[dp + 30] = -t27;
d[dp + 2] = t27;
d[dp + 29] = -t28;
d[dp + 3] = t28;
d[dp + 28] = -t07;
d[dp + 4] = t07;
d[dp + 27] = -t26;
d[dp + 5] = t26;
d[dp + 26] = -t23;
d[dp + 6] = t23;
d[dp + 25] = -t10;
d[dp + 7] = t10;
d[dp + 24] = -t15;
d[dp + 8] = t15;
d[dp + 23] = -t12;
d[dp + 9] = t12;
d[dp + 22] = -t19;
d[dp + 10] = t19;
d[dp + 21] = -t20;
d[dp + 11] = t20;
d[dp + 20] = -t13;
d[dp + 12] = t13;
d[dp + 19] = -t24;
d[dp + 13] = t24;
d[dp + 18] = -t31;
d[dp + 14] = t31;
d[dp + 17] = -t02;
d[dp + 15] = t02;
d[dp + 16] = 0
}
;
MP2.FRAME_SYNC = 2047;
MP2.VERSION = {
MPEG_2_5: 0,
MPEG_2: 2,
MPEG_1: 3
};
MP2.LAYER = {
III: 1,
II: 2,
I: 3
};
MP2.MODE = {
STEREO: 0,
JOINT_STEREO: 1,
DUAL_CHANNEL: 2,
MONO: 3
};
MP2.SAMPLE_RATE = new Uint16Array([44100, 48e3, 32e3, 0, 22050, 24e3, 16e3, 0]);
MP2.BIT_RATE = new Uint16Array([32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160]);
MP2.SCALEFACTOR_BASE = new Uint32Array([33554432, 26632170, 21137968]);
MP2.SYNTHESIS_WINDOW = new Float32Array([0, -.5, -.5, -.5, -.5, -.5, -.5, -1, -1, -1, -1, -1.5, -1.5, -2, -2, -2.5, -2.5, -3, -3.5, -3.5, -4, -4.5, -5, -5.5, -6.5, -7, -8, -8.5, -9.5, -10.5, -12, -13, -14.5, -15.5, -17.5, -19, -20.5, -22.5, -24.5, -26.5, -29, -31.5, -34, -36.5, -39.5, -42.5, -45.5, -48.5, -52, -55.5, -58.5, -62.5, -66, -69.5, -73.5, -77, -80.5, -84.5, -88, -91.5, -95, -98, -101, -104, 106.5, 109, 111, 112.5, 113.5, 114, 114, 113.5, 112, 110.5, 107.5, 104, 100, 94.5, 88.5, 81.5, 73, 63.5, 53, 41.5, 28.5, 14.5, -1, -18, -36, -55.5, -76.5, -98.5, -122, -147, -173.5, -200.5, -229.5, -259.5, -290.5, -322.5, -355.5, -389.5, -424, -459.5, -495.5, -532, -568.5, -605, -641.5, -678, -714, -749, -783.5, -817, -849, -879.5, -908.5, -935, -959.5, -981, -1000.5, -1016, -1028.5, -1037.5, -1042.5, -1043.5, -1040, -1031.5, 1018.5, 1e3, 976, 946.5, 911, 869.5, 822, 767.5, 707, 640, 565.5, 485, 397, 302.5, 201, 92.5, -22.5, -144, -272.5, -407, -547.5, -694, -846, -1003, -1165, -1331.5, -1502, -1675.5, -1852.5, -2031.5, -2212.5, -2394, -2576.5, -2758.5, -2939.5, -3118.5, -3294.5, -3467.5, -3635.5, -3798.5, -3955, -4104.5, -4245.5, -4377.5, -4499, -4609.5, -4708, -4792.5, -4863.5, -4919, -4958, -4979.5, -4983, -4967.5, -4931.5, -4875, -4796, -4694.5, -4569.5, -4420, -4246, -4046, -3820, -3567, 3287, 2979.5, 2644, 2280.5, 1888, 1467.5, 1018.5, 541, 35, -499, -1061, -1650, -2266.5, -2909, -3577, -4270, -4987.5, -5727.5, -6490, -7274, -8077.5, -8899.5, -9739, -10594.5, -11464.5, -12347, -13241, -14144.5, -15056, -15973.5, -16895.5, -17820, -18744.5, -19668, -20588, -21503, -22410.5, -23308.5, -24195, -25068.5, -25926.5, -26767, -27589, -28389, -29166.5, -29919, -30644.5, -31342, -32009.5, -32645, -33247, -33814.5, -34346, -34839.5, -35295, -35710, -36084.5, -36417.5, -36707.5, -36954, -37156.5, -37315, -37428, -37496, 37519, 37496, 37428, 37315, 37156.5, 36954, 36707.5, 36417.5, 36084.5, 35710, 35295, 34839.5, 34346, 33814.5, 33247, 32645, 32009.5, 31342, 30644.5, 29919, 29166.5, 28389, 27589, 26767, 25926.5, 25068.5, 24195, 23308.5, 22410.5, 21503, 20588, 19668, 18744.5, 17820, 16895.5, 15973.5, 15056, 14144.5, 13241, 12347, 11464.5, 10594.5, 9739, 8899.5, 8077.5, 7274, 6490, 5727.5, 4987.5, 4270, 3577, 2909, 2266.5, 1650, 1061, 499, -35, -541, -1018.5, -1467.5, -1888, -2280.5, -2644, -2979.5, 3287, 3567, 3820, 4046, 4246, 4420, 4569.5, 4694.5, 4796, 4875, 4931.5, 4967.5, 4983, 4979.5, 4958, 4919, 4863.5, 4792.5, 4708, 4609.5, 4499, 4377.5, 4245.5, 4104.5, 3955, 3798.5, 3635.5, 3467.5, 3294.5, 3118.5, 2939.5, 2758.5, 2576.5, 2394, 2212.5, 2031.5, 1852.5, 1675.5, 1502, 1331.5, 1165, 1003, 846, 694, 547.5, 407, 272.5, 144, 22.5, -92.5, -201, -302.5, -397, -485, -565.5, -640, -707, -767.5, -822, -869.5, -911, -946.5, -976, -1e3, 1018.5, 1031.5, 1040, 1043.5, 1042.5, 1037.5, 1028.5, 1016, 1000.5, 981, 959.5, 935, 908.5, 879.5, 849, 817, 783.5, 749, 714, 678, 641.5, 605, 568.5, 532, 495.5, 459.5, 424, 389.5, 355.5, 322.5, 290.5, 259.5, 229.5, 200.5, 173.5, 147, 122, 98.5, 76.5, 55.5, 36, 18, 1, -14.5, -28.5, -41.5, -53, -63.5, -73, -81.5, -88.5, -94.5, -100, -104, -107.5, -110.5, -112, -113.5, -114, -114, -113.5, -112.5, -111, -109, 106.5, 104, 101, 98, 95, 91.5, 88, 84.5, 80.5, 77, 73.5, 69.5, 66, 62.5, 58.5, 55.5, 52, 48.5, 45.5, 42.5, 39.5, 36.5, 34, 31.5, 29, 26.5, 24.5, 22.5, 20.5, 19, 17.5, 15.5, 14.5, 13, 12, 10.5, 9.5, 8.5, 8, 7, 6.5, 5.5, 5, 4.5, 4, 3.5, 3.5, 3, 2.5, 2.5, 2, 2, 1.5, 1.5, 1, 1, 1, 1, .5, .5, .5, .5, .5, .5]);
MP2.QUANT_LUT_STEP_1 = [[0, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2], [0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 2]];
MP2.QUANT_TAB = {
A: 27 | 64,
B: 30 | 64,
C: 8,
D: 12
};
MP2.QUANT_LUT_STEP_2 = [[MP2.QUANT_TAB.C, MP2.QUANT_TAB.C, MP2.QUANT_TAB.D], [MP2.QUANT_TAB.A, MP2.QUANT_TAB.A, MP2.QUANT_TAB.A], [MP2.QUANT_TAB.B, MP2.QUANT_TAB.A, MP2.QUANT_TAB.B]];
MP2.QUANT_LUT_STEP_3 = [[68, 68, 52, 52, 52, 52, 52, 52, 52, 52, 52, 52], [67, 67, 67, 66, 66, 66, 66, 66, 66, 66, 66, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 32, 32, 32, 32, 32, 32, 32], [69, 69, 69, 69, 52, 52, 52, 52, 52, 52, 52, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36, 36]];
MP2.QUANT_LUT_STEP4 = [[0, 1, 2, 17], [0, 1, 2, 3, 4, 5, 6, 17], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17], [0, 1, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17], [0, 1, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]];
MP2.QUANT_TAB = [{
levels: 3,
group: 1,
bits: 5
}, {
levels: 5,
group: 1,
bits: 7
}, {
levels: 7,
group: 0,
bits: 3
}, {
levels: 9,
group: 1,
bits: 10
}, {
levels: 15,
group: 0,
bits: 4
}, {
levels: 31,
group: 0,
bits: 5
}, {
levels: 63,
group: 0,
bits: 6
}, {
levels: 127,
group: 0,
bits: 7
}, {
levels: 255,
group: 0,
bits: 8
}, {
levels: 511,
group: 0,
bits: 9
}, {
levels: 1023,
group: 0,
bits: 10
}, {
levels: 2047,
group: 0,
bits: 11
}, {
levels: 4095,
group: 0,
bits: 12
}, {
levels: 8191,
group: 0,
bits: 13
}, {
levels: 16383,
group: 0,
bits: 14
}, {
levels: 32767,
group: 0,
bits: 15
}, {
levels: 65535,
group: 0,
bits: 16
}];
return MP2
}();
JSMpeg.Renderer.WebGL = function() {
"use strict";
var WebGLRenderer = function(options) {
this.canvas = options.canvas || document.createElement("canvas");
this.width = this.canvas.width;
this.height = this.canvas.height;
this.enabled = true;
var contextCreateOptions = {
preserveDrawingBuffer: !!options.preserveDrawingBuffer,
alpha: false,
depth: false,
stencil: false,
antialias: false
};
this.gl = this.canvas.getContext("webgl", contextCreateOptions) || this.canvas.getContext("experimental-webgl", contextCreateOptions);
if (!this.gl) {
throw new Error("Failed to get WebGL Context")
}
var gl = this.gl;
var vertexAttr = null;
this.vertexBuffer = gl.createBuffer();
var vertexCoords = new Float32Array([0, 0, 0, 1, 1, 0, 1, 1]);
gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, vertexCoords, gl.STATIC_DRAW);
this.program = this.createProgram(WebGLRenderer.SHADER.VERTEX_IDENTITY, WebGLRenderer.SHADER.FRAGMENT_YCRCB_TO_RGBA);
vertexAttr = gl.getAttribLocation(this.program, "vertex");
gl.enableVertexAttribArray(vertexAttr);
gl.vertexAttribPointer(vertexAttr, 2, gl.FLOAT, false, 0, 0);
this.textureY = this.createTexture(0, "textureY");
this.textureCb = this.createTexture(1, "textureCb");
this.textureCr = this.createTexture(2, "textureCr");
this.loadingProgram = this.createProgram(WebGLRenderer.SHADER.VERTEX_IDENTITY, WebGLRenderer.SHADER.FRAGMENT_LOADING);
vertexAttr = gl.getAttribLocation(this.loadingProgram, "vertex");
gl.enableVertexAttribArray(vertexAttr);
gl.vertexAttribPointer(vertexAttr, 2, gl.FLOAT, false, 0, 0);
this.shouldCreateUnclampedViews = !this.allowsClampedTextureData()
};
WebGLRenderer.prototype.destroy = function() {
var gl = this.gl;
gl.deleteTexture(this.textureY);
gl.deleteTexture(this.textureCb);
gl.deleteTexture(this.textureCr);
gl.deleteProgram(this.program);
gl.deleteProgram(this.loadingProgram);
gl.deleteBuffer(this.vertexBuffer)
}
;
WebGLRenderer.prototype.resize = function(width, height) {
this.width = width | 0;
this.height = height | 0;
this.canvas.width = this.width;
this.canvas.height = this.height;
this.gl.useProgram(this.program);
this.gl.viewport(0, 0, this.width, this.height)
}
;
WebGLRenderer.prototype.createTexture = function(index, name) {
var gl = this.gl;
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.uniform1i(gl.getUniformLocation(this.program, name), index);
return texture
}
;
WebGLRenderer.prototype.createProgram = function(vsh, fsh) {
var gl = this.gl;
var program = gl.createProgram();
gl.attachShader(program, this.compileShader(gl.VERTEX_SHADER, vsh));
gl.attachShader(program, this.compileShader(gl.FRAGMENT_SHADER, fsh));
gl.linkProgram(program);
gl.useProgram(program);
return program
}
;
WebGLRenderer.prototype.compileShader = function(type, source) {
var gl = this.gl;
var shader = gl.createShader(type);
gl.shaderSource(shader, source);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
throw new Error(gl.getShaderInfoLog(shader))
}
return shader
}
;
WebGLRenderer.prototype.allowsClampedTextureData = function() {
var gl = this.gl;
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.LUMINANCE, 1, 1, 0, gl.LUMINANCE, gl.UNSIGNED_BYTE, new Uint8ClampedArray([0]));
return gl.getError() === 0
}
;
WebGLRenderer.prototype.renderProgress = function(progress) {
var gl = this.gl;
gl.useProgram(this.loadingProgram);
var loc = gl.getUniformLocation(this.loadingProgram, "progress");
gl.uniform1f(loc, progress);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4)
}
;
WebGLRenderer.prototype.render = function(y, cb, cr) {
if (!this.enabled) {
return
}
var gl = this.gl;
var w = this.width + 15 >> 4 << 4
, h = this.height
, w2 = w >> 1
, h2 = h >> 1;
if (this.shouldCreateUnclampedViews) {
y = new Uint8Array(y.buffer),
cb = new Uint8Array(cb.buffer),
cr = new Uint8Array(cr.buffer)
}
gl.useProgram(this.program);
this.updateTexture(gl.TEXTURE0, this.textureY, w, h, y);
this.updateTexture(gl.TEXTURE1, this.textureCb, w2, h2, cb);
this.updateTexture(gl.TEXTURE2, this.textureCr, w2, h2, cr);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4)
}
;
WebGLRenderer.prototype.updateTexture = function(unit, texture, w, h, data) {
var gl = this.gl;
gl.activeTexture(unit);
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.LUMINANCE, w, h, 0, gl.LUMINANCE, gl.UNSIGNED_BYTE, data)
}
;
WebGLRenderer.IsSupported = function() {
try {
if (!window.WebGLRenderingContext) {
return false
}
var canvas = document.createElement("canvas");
return !!(canvas.getContext("webgl") || canvas.getContext("experimental-webgl"))
} catch (err) {
return false
}
}
;
WebGLRenderer.SHADER = {
FRAGMENT_YCRCB_TO_RGBA: ["precision mediump float;", "uniform sampler2D textureY;", "uniform sampler2D textureCb;", "uniform sampler2D textureCr;", "varying vec2 texCoord;", "mat4 rec601 = mat4(", "1.16438, 0.00000, 1.59603, -0.87079,", "1.16438, -0.39176, -0.81297, 0.52959,", "1.16438, 2.01723, 0.00000, -1.08139,", "0, 0, 0, 1", ");", "void main() {", "float y = texture2D(textureY, texCoord).r;", "float cb = texture2D(textureCb, texCoord).r;", "float cr = texture2D(textureCr, texCoord).r;", "gl_FragColor = vec4(y, cr, cb, 1.0) * rec601;", "}"].join("\n"),
FRAGMENT_LOADING: ["precision mediump float;", "uniform float progress;", "varying vec2 texCoord;", "void main() {", "float c = ceil(progress-(1.0-texCoord.y));", "gl_FragColor = vec4(c,c,c,1);", "}"].join("\n"),
VERTEX_IDENTITY: ["attribute vec2 vertex;", "varying vec2 texCoord;", "void main() {", "texCoord = vertex;", "gl_Position = vec4((vertex * 2.0 - 1.0) * vec2(1, -1), 0.0, 1.0);", "}"].join("\n")
};
return WebGLRenderer
}();
JSMpeg.Renderer.Canvas2D = function() {
"use strict";
var CanvasRenderer = function(options) {
this.canvas = options.canvas || document.createElement("canvas");
this.width = this.canvas.width;
this.height = this.canvas.height;
this.enabled = true;
this.context = this.canvas.getContext("2d")
};
CanvasRenderer.prototype.destroy = function() {}
;
CanvasRenderer.prototype.resize = function(width, height) {
this.width = width | 0;
this.height = height | 0;
this.canvas.width = this.width;
this.canvas.height = this.height;
this.imageData = this.context.getImageData(0, 0, this.width, this.height);
JSMpeg.Fill(this.imageData.data, 255)
}
;
CanvasRenderer.prototype.renderProgress = function(progress) {
var w = this.canvas.width
, h = this.canvas.height
, ctx = this.context;
ctx.fillStyle = "#222";
ctx.fillRect(0, 0, w, h);
ctx.fillStyle = "#fff";
ctx.fillRect(0, h - h * progress, w, h * progress)
}
;
CanvasRenderer.prototype.render = function(y, cb, cr) {
this.YCbCrToRGBA(y, cb, cr, this.imageData.data);
this.context.putImageData(this.imageData, 0, 0)
}
;
CanvasRenderer.prototype.YCbCrToRGBA = function(y, cb, cr, rgba) {
if (!this.enabled) {
return
}
var w = this.width + 15 >> 4 << 4
, w2 = w >> 1;
var yIndex1 = 0
, yIndex2 = w
, yNext2Lines = w + (w - this.width);
var cIndex = 0
, cNextLine = w2 - (this.width >> 1);
var rgbaIndex1 = 0
, rgbaIndex2 = this.width * 4
, rgbaNext2Lines = this.width * 4;
var cols = this.width >> 1
, rows = this.height >> 1;
var ccb, ccr, r, g, b;
for (var row = 0; row < rows; row++) {
for (var col = 0; col < cols; col++) {
ccb = cb[cIndex];
ccr = cr[cIndex];
cIndex++;
r = ccb + (ccb * 103 >> 8) - 179;
g = (ccr * 88 >> 8) - 44 + (ccb * 183 >> 8) - 91;
b = ccr + (ccr * 198 >> 8) - 227;
var y1 = y[yIndex1++];
var y2 = y[yIndex1++];
rgba[rgbaIndex1] = y1 + r;
rgba[rgbaIndex1 + 1] = y1 - g;
rgba[rgbaIndex1 + 2] = y1 + b;
rgba[rgbaIndex1 + 4] = y2 + r;
rgba[rgbaIndex1 + 5] = y2 - g;
rgba[rgbaIndex1 + 6] = y2 + b;
rgbaIndex1 += 8;
var y3 = y[yIndex2++];
var y4 = y[yIndex2++];
rgba[rgbaIndex2] = y3 + r;
rgba[rgbaIndex2 + 1] = y3 - g;
rgba[rgbaIndex2 + 2] = y3 + b;
rgba[rgbaIndex2 + 4] = y4 + r;
rgba[rgbaIndex2 + 5] = y4 - g;
rgba[rgbaIndex2 + 6] = y4 + b;
rgbaIndex2 += 8
}
yIndex1 += yNext2Lines;
yIndex2 += yNext2Lines;
rgbaIndex1 += rgbaNext2Lines;
rgbaIndex2 += rgbaNext2Lines;
cIndex += cNextLine
}
}
;
return CanvasRenderer
}();
JSMpeg.AudioOutput.WebAudio = function() {
"use strict";
var WebAudioOut = function(options) {
this.context = WebAudioOut.CachedContext = WebAudioOut.CachedContext || new (window.AudioContext || window.webkitAudioContext);
this.gain = this.context.createGain();
this.destination = this.gain;
this.gain.connect(this.context.destination);
this.context._connections = (this.context._connections || 0) + 1;
this.startTime = 0;
this.buffer = null;
this.wallclockStartTime = 0;
this.volume = 1;
this.enabled = true;
this.unlocked = !WebAudioOut.NeedsUnlocking();
Object.defineProperty(this, "enqueuedTime", {
get: this.getEnqueuedTime
})
};
WebAudioOut.prototype.destroy = function() {
this.gain.disconnect();
this.context._connections--;
if (this.context._connections === 0) {
this.context.close();
WebAudioOut.CachedContext = null
}
}
;
WebAudioOut.prototype.play = function(sampleRate, left, right) {
if (!this.enabled) {
return
}
if (!this.unlocked) {
var ts = JSMpeg.Now();
if (this.wallclockStartTime < ts) {
this.wallclockStartTime = ts
}
this.wallclockStartTime += left.length / sampleRate;
return
}
this.gain.gain.value = this.volume;
var buffer = this.context.createBuffer(2, left.length, sampleRate);
buffer.getChannelData(0).set(left);
buffer.getChannelData(1).set(right);
var source = this.context.createBufferSource();
source.buffer = buffer;
source.connect(this.destination);
var now = this.context.currentTime;
var duration = buffer.duration;
if (this.startTime < now) {
this.startTime = now;
this.wallclockStartTime = JSMpeg.Now()
}
source.start(this.startTime);
this.startTime += duration;
this.wallclockStartTime += duration
}
;
WebAudioOut.prototype.stop = function() {
this.gain.gain.value = 0
}
;
WebAudioOut.prototype.getEnqueuedTime = function() {
return Math.max(this.wallclockStartTime - JSMpeg.Now(), 0)
}
;
WebAudioOut.prototype.resetEnqueuedTime = function() {
this.startTime = this.context.currentTime;
this.wallclockStartTime = JSMpeg.Now()
}
;
WebAudioOut.prototype.unlock = function(callback) {
if (this.unlocked) {
if (callback) {
callback()
}
return
}
this.unlockCallback = callback;
var buffer = this.context.createBuffer(1, 1, 22050);
var source = this.context.createBufferSource();
source.buffer = buffer;
source.connect(this.destination);
source.start(0);
setTimeout(this.checkIfUnlocked.bind(this, source, 0), 0)
}
;
WebAudioOut.prototype.checkIfUnlocked = function(source, attempt) {
if (source.playbackState === source.PLAYING_STATE || source.playbackState === source.FINISHED_STATE) {
this.unlocked = true;
if (this.unlockCallback) {
this.unlockCallback();
this.unlockCallback = null
}
} else if (attempt < 10) {
setTimeout(this.checkIfUnlocked.bind(this, source, attempt + 1), 100)
}
}
;
WebAudioOut.NeedsUnlocking = function() {
return /iPhone|iPad|iPod/i.test(navigator.userAgent)
}
;
WebAudioOut.IsSupported = function() {
return window.AudioContext || window.webkitAudioContext
}
;
WebAudioOut.CachedContext = null;
return WebAudioOut
}();
@JiangWeixian
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Author

https://www.cnblogs.com/luoeeyang/p/7524824.html 原理是这个。

  1. 安卓是canvas
  2. ios不需要这个ts直接使用video元素就可以了

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