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7 |
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8 | 'use strict';
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9 |
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10 | Object.defineProperty(exports, '__esModule', {
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11 | value: true
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12 | });
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13 |
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14 | var _slicedToArray = (function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i['return']) _i['return'](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError('Invalid attempt to destructure non-iterable instance'); } }; })();
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15 |
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16 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }
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17 |
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18 | var _videoJs = require('video.js');
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19 |
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20 | var _videoJs2 = _interopRequireDefault(_videoJs);
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21 |
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22 |
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23 | var TIME_FUDGE_FACTOR = 1 / 30;
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24 |
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25 |
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26 |
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27 |
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28 |
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29 |
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30 |
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31 |
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32 | var clamp = function clamp(num, _ref) {
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33 | var _ref2 = _slicedToArray(_ref, 2);
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34 |
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35 | var start = _ref2[0];
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36 | var end = _ref2[1];
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37 |
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38 | return Math.min(Math.max(start, num), end);
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39 | };
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40 | var filterRanges = function filterRanges(timeRanges, predicate) {
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41 | var results = [];
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42 | var i = undefined;
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43 |
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44 | if (timeRanges && timeRanges.length) {
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45 |
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46 | for (i = 0; i < timeRanges.length; i++) {
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47 | if (predicate(timeRanges.start(i), timeRanges.end(i))) {
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48 | results.push([timeRanges.start(i), timeRanges.end(i)]);
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49 | }
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50 | }
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51 | }
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52 |
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53 | return _videoJs2['default'].createTimeRanges(results);
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54 | };
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55 |
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56 |
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57 |
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58 |
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59 |
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60 |
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61 |
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62 |
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63 | var findRange = function findRange(buffered, time) {
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64 | return filterRanges(buffered, function (start, end) {
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65 | return start - TIME_FUDGE_FACTOR <= time && end + TIME_FUDGE_FACTOR >= time;
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66 | });
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67 | };
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68 |
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69 |
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70 |
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71 |
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72 |
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73 |
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74 |
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75 | var findNextRange = function findNextRange(timeRanges, time) {
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76 | return filterRanges(timeRanges, function (start) {
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77 | return start - TIME_FUDGE_FACTOR >= time;
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78 | });
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79 | };
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80 |
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81 |
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82 |
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83 |
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84 |
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85 |
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86 | var findGaps = function findGaps(buffered) {
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87 | if (buffered.length < 2) {
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88 | return _videoJs2['default'].createTimeRanges();
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89 | }
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90 |
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91 | var ranges = [];
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92 |
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93 | for (var i = 1; i < buffered.length; i++) {
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94 | var start = buffered.end(i - 1);
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95 | var end = buffered.start(i);
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96 |
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97 | ranges.push([start, end]);
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98 | }
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99 |
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100 | return _videoJs2['default'].createTimeRanges(ranges);
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101 | };
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102 |
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103 |
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104 |
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105 |
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106 |
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107 |
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108 |
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109 |
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110 |
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111 |
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112 | var findSoleUncommonTimeRangesEnd = function findSoleUncommonTimeRangesEnd(original, update) {
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113 | var i = undefined;
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114 | var start = undefined;
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115 | var end = undefined;
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116 | var result = [];
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117 | var edges = [];
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118 |
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119 |
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120 |
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121 |
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122 |
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123 |
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124 | var overlapsCurrentEnd = function overlapsCurrentEnd(span) {
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125 | return span[0] <= end && span[1] >= end;
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126 | };
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127 |
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128 | if (original) {
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129 |
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130 | for (i = 0; i < original.length; i++) {
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131 | start = original.start(i);
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132 | end = original.end(i);
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133 |
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134 | edges.push([start, end]);
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135 | }
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136 | }
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137 |
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138 | if (update) {
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139 |
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140 |
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141 | for (i = 0; i < update.length; i++) {
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142 | start = update.start(i);
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143 | end = update.end(i);
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144 |
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145 | if (edges.some(overlapsCurrentEnd)) {
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146 | continue;
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147 | }
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148 |
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149 |
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150 | result.push(end);
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151 | }
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152 | }
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153 |
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154 |
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155 |
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156 | if (result.length !== 1) {
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157 | return null;
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158 | }
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159 |
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160 | return result[0];
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161 | };
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162 |
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163 |
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164 |
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165 |
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166 |
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167 |
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168 |
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169 | var bufferIntersection = function bufferIntersection(bufferA, bufferB) {
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170 | var start = null;
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171 | var end = null;
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172 | var arity = 0;
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173 | var extents = [];
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174 | var ranges = [];
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175 |
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176 | if (!bufferA || !bufferA.length || !bufferB || !bufferB.length) {
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177 | return _videoJs2['default'].createTimeRange();
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178 | }
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179 |
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180 |
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181 |
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182 | var count = bufferA.length;
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183 |
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184 |
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185 | while (count--) {
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186 | extents.push({ time: bufferA.start(count), type: 'start' });
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187 | extents.push({ time: bufferA.end(count), type: 'end' });
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188 | }
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189 | count = bufferB.length;
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190 | while (count--) {
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191 | extents.push({ time: bufferB.start(count), type: 'start' });
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192 | extents.push({ time: bufferB.end(count), type: 'end' });
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193 | }
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194 |
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195 | extents.sort(function (a, b) {
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196 | return a.time - b.time;
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197 | });
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198 |
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199 |
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200 |
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201 | for (count = 0; count < extents.length; count++) {
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202 | if (extents[count].type === 'start') {
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203 | arity++;
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204 |
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205 |
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206 |
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207 | if (arity === 2) {
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208 | start = extents[count].time;
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209 | }
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210 | } else if (extents[count].type === 'end') {
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211 | arity--;
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212 |
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213 |
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214 |
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215 | if (arity === 1) {
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216 | end = extents[count].time;
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217 | }
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218 | }
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219 |
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220 |
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221 | if (start !== null && end !== null) {
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222 | ranges.push([start, end]);
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223 | start = null;
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224 | end = null;
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225 | }
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226 | }
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227 |
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228 | return _videoJs2['default'].createTimeRanges(ranges);
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229 | };
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230 |
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231 |
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232 |
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233 |
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234 |
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235 |
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236 |
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237 |
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238 |
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239 |
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240 |
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241 |
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242 |
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243 | var calculateBufferedPercent = function calculateBufferedPercent(adjustedRange, referenceRange, currentTime, buffered) {
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244 | var referenceDuration = referenceRange.end(0) - referenceRange.start(0);
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245 | var adjustedDuration = adjustedRange.end(0) - adjustedRange.start(0);
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246 | var bufferMissingFromAdjusted = referenceDuration - adjustedDuration;
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247 | var adjustedIntersection = bufferIntersection(adjustedRange, buffered);
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248 | var referenceIntersection = bufferIntersection(referenceRange, buffered);
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249 | var adjustedOverlap = 0;
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250 | var referenceOverlap = 0;
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251 |
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252 | var count = adjustedIntersection.length;
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253 |
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254 | while (count--) {
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255 | adjustedOverlap += adjustedIntersection.end(count) - adjustedIntersection.start(count);
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256 |
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257 |
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258 |
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259 |
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260 |
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261 | if (adjustedIntersection.start(count) === currentTime) {
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262 | adjustedOverlap += bufferMissingFromAdjusted;
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263 | }
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264 | }
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265 |
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266 | count = referenceIntersection.length;
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267 |
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268 | while (count--) {
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269 | referenceOverlap += referenceIntersection.end(count) - referenceIntersection.start(count);
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270 | }
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271 |
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272 |
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273 |
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274 | return Math.max(adjustedOverlap, referenceOverlap) / referenceDuration * 100;
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275 | };
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276 |
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277 |
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278 |
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279 |
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280 |
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281 |
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282 |
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283 |
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284 |
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285 |
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286 |
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287 |
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288 |
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289 | var getSegmentBufferedPercent = function getSegmentBufferedPercent(startOfSegment, segmentDuration, currentTime, buffered) {
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290 | var endOfSegment = startOfSegment + segmentDuration;
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291 |
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292 |
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293 | var originalSegmentRange = _videoJs2['default'].createTimeRanges([[startOfSegment, endOfSegment]]);
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294 |
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295 |
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296 |
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297 |
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298 |
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299 |
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300 |
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301 | var adjustedSegmentRange = _videoJs2['default'].createTimeRanges([[clamp(startOfSegment, [currentTime, endOfSegment]), endOfSegment]]);
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302 |
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303 |
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304 |
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305 | if (adjustedSegmentRange.start(0) === adjustedSegmentRange.end(0)) {
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306 | return 0;
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307 | }
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308 |
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309 | var percent = calculateBufferedPercent(adjustedSegmentRange, originalSegmentRange, currentTime, buffered);
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310 |
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311 |
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312 |
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313 | if (isNaN(percent) || percent === Infinity || percent === -Infinity) {
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314 | return 0;
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315 | }
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316 |
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317 | return percent;
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318 | };
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319 |
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320 |
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321 |
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322 |
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323 |
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324 |
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325 |
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326 | var printableRange = function printableRange(range) {
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327 | var strArr = [];
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328 |
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329 | if (!range || !range.length) {
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330 | return '';
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331 | }
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332 |
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333 | for (var i = 0; i < range.length; i++) {
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334 | strArr.push(range.start(i) + ' => ' + range.end(i));
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335 | }
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336 |
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337 | return strArr.join(', ');
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338 | };
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339 |
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340 |
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341 |
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342 |
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343 |
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344 |
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345 |
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346 |
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347 |
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348 |
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349 |
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350 |
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351 |
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352 |
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353 |
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354 | var timeUntilRebuffer = function timeUntilRebuffer(buffered, currentTime) {
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355 | var playbackRate = arguments.length <= 2 || arguments[2] === undefined ? 1 : arguments[2];
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356 |
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357 | var bufferedEnd = buffered.length ? buffered.end(buffered.length - 1) : 0;
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358 |
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359 | return (bufferedEnd - currentTime) / playbackRate;
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360 | };
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361 |
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362 | exports['default'] = {
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363 | findRange: findRange,
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364 | findNextRange: findNextRange,
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365 | findGaps: findGaps,
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366 | findSoleUncommonTimeRangesEnd: findSoleUncommonTimeRangesEnd,
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367 | getSegmentBufferedPercent: getSegmentBufferedPercent,
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368 | TIME_FUDGE_FACTOR: TIME_FUDGE_FACTOR,
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369 | printableRange: printableRange,
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370 | timeUntilRebuffer: timeUntilRebuffer
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371 | };
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372 | module.exports = exports['default']; |
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