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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
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href="MediaPlayerEvents.html#event:MANIFEST_LOADED">MANIFEST_LOADED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_LOADING_FINISHED">MANIFEST_LOADING_FINISHED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_LOADING_STARTED">MANIFEST_LOADING_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_VALIDITY_CHANGED">MANIFEST_VALIDITY_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRIC_ADDED">METRIC_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRIC_CHANGED">METRIC_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRIC_UPDATED">METRIC_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRICS_CHANGED">METRICS_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PERIOD_SWITCH_COMPLETED">PERIOD_SWITCH_COMPLETED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PERIOD_SWITCH_STARTED">PERIOD_SWITCH_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_ENDED">PLAYBACK_ENDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_ERROR">PLAYBACK_ERROR</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_LOADED_DATA">PLAYBACK_LOADED_DATA</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_METADATA_LOADED">PLAYBACK_METADATA_LOADED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_NOT_ALLOWED">PLAYBACK_NOT_ALLOWED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_PAUSED">PLAYBACK_PAUSED</a></div><div 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class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_VOLUME_CHANGED">PLAYBACK_VOLUME_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_WAITING">PLAYBACK_WAITING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:QUALITY_CHANGE_RENDERED">QUALITY_CHANGE_RENDERED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:QUALITY_CHANGE_REQUESTED">QUALITY_CHANGE_REQUESTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:REPRESENTATION_SWITCH">REPRESENTATION_SWITCH</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_ACTIVATED">STREAM_ACTIVATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_DEACTIVATED">STREAM_DEACTIVATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_INITIALIZED">STREAM_INITIALIZED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_INITIALIZING">STREAM_INITIALIZING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_TEARDOWN_COMPLETE">STREAM_TEARDOWN_COMPLETE</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_UPDATED">STREAM_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TEXT_TRACK_ADDED">TEXT_TRACK_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TEXT_TRACKS_ADDED">TEXT_TRACKS_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:THROUGHPUT_MEASUREMENT_STORED">THROUGHPUT_MEASUREMENT_STORED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TRACK_CHANGE_RENDERED">TRACK_CHANGE_RENDERED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TTML_PARSED">TTML_PARSED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TTML_TO_PARSE">TTML_TO_PARSE</a></div><div class="sidebar-section-children"><a href="MetricsReportingEvents.html#event:CMCD_DATA_GENERATED">CMCD_DATA_GENERATED</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_FINISHED">OFFLINE_RECORD_FINISHED</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_LOADEDMETADATA">OFFLINE_RECORD_LOADEDMETADATA</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_STARTED">OFFLINE_RECORD_STARTED</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_STOPPED">OFFLINE_RECORD_STOPPED</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_ADDED">KEY_ADDED</a></div><div 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class="has-anchor">streaming_utils_EBMLParser.js</h1></header><article><pre class="prettyprint source lang-js"><code>import FactoryMaker from '../../core/FactoryMaker';
/**
* Creates an instance of an EBMLParser class which implements a large subset
* of the functionality required to parse Matroska EBML
*
* @param {Object} config object with data member which is the buffer to parse
* @ignore
*/
function EBMLParser(config) {
config = config || {};
let instance;
let data = new DataView(config.data);
let pos = 0;
function getPos() {
return pos;
}
function setPos(value) {
pos = value;
}
/**
* Consumes an EBML tag from the data stream.
*
* @param {Object} tag to parse, A tag is an object with at least a {number} tag and
* {boolean} required flag.
* @param {boolean} test whether or not the function should throw if a required
* tag is not found
* @return {boolean} whether or not the tag was found
* @throws will throw an exception if a required tag is not found and test
* param is false or undefined, or if the stream is malformed.
* @memberof EBMLParser
*/
function consumeTag(tag, test) {
let found = true;
let bytesConsumed = 0;
let p1,
p2;
if (test === undefined) {
test = false;
}
if (tag.tag > 0xFFFFFF) {
if (data.getUint32(pos) !== tag.tag) {
found = false;
}
bytesConsumed = 4;
} else if (tag.tag > 0xFFFF) {
// 3 bytes
p1 = data.getUint16(pos);
p2 = data.getUint8(pos + 2);
// shift p1 over a byte and add p2
if (p1 * 256 + p2 !== tag.tag) {
found = false;
}
bytesConsumed = 3;
} else if (tag.tag > 0xFF) {
if (data.getUint16(pos) !== tag.tag) {
found = false;
}
bytesConsumed = 2;
} else {
if (data.getUint8(pos) !== tag.tag) {
found = false;
}
bytesConsumed = 1;
}
if (!found && tag.required && !test) {
throw new Error('required tag not found');
}
if (found) {
pos += bytesConsumed;
}
return found;
}
/**
* Consumes an EBML tag from the data stream. If the tag is found then this
* function will also remove the size field which follows the tag from the
* data stream.
*
* @param {Object} tag to parse, A tag is an object with at least a {number} tag and
* {boolean} required flag.
* @param {boolean} test whether or not the function should throw if a required
* tag is not found
* @return {boolean} whether or not the tag was found
* @throws will throw an exception if a required tag is not found and test
* param is false or undefined, or if the stream is malformedata.
* @memberof EBMLParser
*/
function consumeTagAndSize(tag, test) {
let found = consumeTag(tag, test);
if (found) {
getMatroskaCodedNum();
}
return found;
}
/**
* Consumes an EBML tag from the data stream. If the tag is found then this
* function will also remove the size field which follows the tag from the
* data stream. It will use the value of the size field to parse a binary
* field, using a parser defined in the tag itself
*
* @param {Object} tag to parse, A tag is an object with at least a {number} tag,
* {boolean} required flag, and a parse function which takes a size parameter
* @return {boolean} whether or not the tag was found
* @throws will throw an exception if a required tag is not found,
* or if the stream is malformed
* @memberof EBMLParser
*/
function parseTag(tag) {
let size;
consumeTag(tag);
size = getMatroskaCodedNum();
return instance[tag.parse](size);
}
/**
* Consumes an EBML tag from the data stream. If the tag is found then this
* function will also remove the size field which follows the tag from the
* data stream. It will use the value of the size field to skip over the
* entire section of EBML encapsulated by the tag.
*
* @param {Object} tag to parse, A tag is an object with at least a {number} tag, and
* {boolean} required flag
* @param {boolean} test a flag to indicate if an exception should be thrown
* if a required tag is not found
* @return {boolean} whether or not the tag was found
* @throws will throw an exception if a required tag is not found and test is
* false or undefined or if the stream is malformed
* @memberof EBMLParser
*/
function skipOverElement(tag, test) {
let found = consumeTag(tag, test);
let headerSize;
if (found) {
headerSize = getMatroskaCodedNum();
pos += headerSize;
}
return found;
}
/**
* Returns and consumes a number encoded according to the Matroska EBML
* specification from the bitstream.
*
* @param {boolean} retainMSB whether or not to retain the Most Significant Bit (the
* first 1). this is usually true when reading Tag IDs.
* @return {number} the decoded number
* @throws will throw an exception if the bit stream is malformed or there is
* not enough data
* @memberof EBMLParser
*/
function getMatroskaCodedNum(retainMSB) {
let bytesUsed = 1;
let mask = 0x80;
let maxBytes = 8;
let extraBytes = -1;
let num = 0;
let ch = data.getUint8(pos);
let i = 0;
for (i = 0; i < maxBytes; i += 1) {
if ((ch & mask) === mask) {
num = (retainMSB === undefined) ? ch & ~mask : ch;
extraBytes = i;
break;
}
mask >>= 1;
}
for (i = 0; i < extraBytes; i += 1, bytesUsed += 1) {
num = (num << 8) | (0xff & data.getUint8(pos + bytesUsed));
}
pos += bytesUsed;
return num;
}
/**
* Returns and consumes a float from the bitstream.
*
* @param {number} size 4 or 8 byte floats are supported
* @return {number} the decoded number
* @throws will throw an exception if the bit stream is malformed or there is
* not enough data
* @memberof EBMLParser
*/
function getMatroskaFloat(size) {
let outFloat;
switch (size) {
case 4:
outFloat = data.getFloat32(pos);
pos += 4;
break;
case 8:
outFloat = data.getFloat64(pos);
pos += 8;
break;
}
return outFloat;
}
/**
* Consumes and returns an unsigned int from the bitstream.
*
* @param {number} size 1 to 8 bytes
* @return {number} the decoded number
* @throws will throw an exception if the bit stream is malformed, there is
* not enough data, or if the value exceeds the maximum safe integer value
* @memberof EBMLParser
*/
function getMatroskaUint(size) {
if (size > 4) {
return getMatroskaUintLarge(size);
}
let val = 0;
for (let i = 0; i < size; i += 1) {
val <<= 8;
val |= data.getUint8(pos + i) & 0xff;
}
pos += size;
return val >>> 0;
}
/**
* Consumes and returns an unsigned int from the bitstream.
*
* @param {number} size 1 to 8 bytes
* @return {number} the decoded number
* @throws will throw an exception if the bit stream is malformed, there is
* not enough data, or if the value exceeds the maximum safe integer value
*/
function getMatroskaUintLarge(size) {
const limit = Math.floor(Number.MAX_SAFE_INTEGER / 256);
let val = 0;
for (let i = 0; i < size; i += 1) {
if (val > limit) {
throw new Error('Value exceeds safe integer limit');
}
val *= 256;
const n = data.getUint8(pos + i);
if (val > Number.MAX_SAFE_INTEGER - n) {
throw new Error('Value exceeds safe integer limit');
}
val += n;
}
pos += size;
return val;
}
/**
* Tests whether there is more data in the bitstream for parsing
*
* @return {boolean} whether there is more data to parse
* @memberof EBMLParser
*/
function moreData() {
return pos < data.byteLength;
}
instance = {
getPos: getPos,
setPos: setPos,
consumeTag: consumeTag,
consumeTagAndSize: consumeTagAndSize,
parseTag: parseTag,
skipOverElement: skipOverElement,
getMatroskaCodedNum: getMatroskaCodedNum,
getMatroskaFloat: getMatroskaFloat,
getMatroskaUint: getMatroskaUint,
moreData: moreData
};
return instance;
}
EBMLParser.__dashjs_factory_name = 'EBMLParser';
export default FactoryMaker.getClassFactory(EBMLParser);
</code></pre></article></section></div></div></div><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use xlink:href="#search-icon"></use></svg> <input type="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><div class="search-result-c" id="fWwVHRuDuN"><span class="search-result-c-text">Type anything to view search result</span></div></div></div><div class="mobile-menu-icon-container"><button class="icon-button" id="mobile-menu" data-isopen="false" aria-label="menu"><svg><use xlink:href="#menu-icon"></use></svg></button></div><div id="mobile-sidebar" class="mobile-sidebar-container"><div class="mobile-sidebar-wrapper"><a href="/" class="sidebar-title sidebar-title-anchor">Home</a><div class="mobile-nav-links"></div><div 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