113 lines
2.6 KiB
JavaScript
113 lines
2.6 KiB
JavaScript
/**
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* @file bin-utils.js
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*/
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/**
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* convert a TimeRange to text
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*
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* @param {TimeRange} range the timerange to use for conversion
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* @param {Number} i the iterator on the range to convert
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*/
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const textRange = function(range, i) {
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return range.start(i) + '-' + range.end(i);
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};
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/**
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* format a number as hex string
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*
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* @param {Number} e The number
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* @param {Number} i the iterator
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*/
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const formatHexString = function(e, i) {
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let value = e.toString(16);
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return '00'.substring(0, 2 - value.length) + value + (i % 2 ? ' ' : '');
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};
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const formatAsciiString = function(e) {
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if (e >= 0x20 && e < 0x7e) {
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return String.fromCharCode(e);
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}
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return '.';
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};
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/**
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* Creates an object for sending to a web worker modifying properties that are TypedArrays
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* into a new object with seperated properties for the buffer, byteOffset, and byteLength.
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*
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* @param {Object} message
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* Object of properties and values to send to the web worker
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* @return {Object}
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* Modified message with TypedArray values expanded
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* @function createTransferableMessage
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*/
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const createTransferableMessage = function(message) {
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const transferable = {};
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Object.keys(message).forEach((key) => {
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const value = message[key];
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if (ArrayBuffer.isView(value)) {
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transferable[key] = {
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bytes: value.buffer,
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byteOffset: value.byteOffset,
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byteLength: value.byteLength
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};
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} else {
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transferable[key] = value;
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}
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});
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return transferable;
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};
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/**
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* Returns a unique string identifier for a media initialization
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* segment.
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*/
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const initSegmentId = function(initSegment) {
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let byterange = initSegment.byterange || {
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length: Infinity,
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offset: 0
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};
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return [
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byterange.length, byterange.offset, initSegment.resolvedUri
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].join(',');
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};
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/**
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* utils to help dump binary data to the console
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*/
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const utils = {
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hexDump(data) {
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let bytes = Array.prototype.slice.call(data);
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let step = 16;
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let result = '';
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let hex;
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let ascii;
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for (let j = 0; j < bytes.length / step; j++) {
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hex = bytes.slice(j * step, j * step + step).map(formatHexString).join('');
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ascii = bytes.slice(j * step, j * step + step).map(formatAsciiString).join('');
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result += hex + ' ' + ascii + '\n';
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}
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return result;
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},
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tagDump(tag) {
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return utils.hexDump(tag.bytes);
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},
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textRanges(ranges) {
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let result = '';
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let i;
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for (i = 0; i < ranges.length; i++) {
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result += textRange(ranges, i) + ' ';
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}
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return result;
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},
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createTransferableMessage,
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initSegmentId
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};
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export default utils;
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