1 | // Sample Media Player using HTML5's Media API
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2 | //
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3 | // Ian Devlin (c) 2012
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4 | // http://iandevlin.com
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5 | // http://twitter.com/iandevlin
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6 | //
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7 | // This was written as part of an article for the February 2013 edition of .net magazine (http://netmagazine.com/)
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8 |
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9 | // Wait for the DOM to be loaded before initialising the media player
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10 | document.addEventListener("DOMContentLoaded", function() { initialiseMediaPlayer(); }, false);
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11 |
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12 | // Variables to store handles to various required elements
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13 | var mediaPlayer;
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14 | var playPauseBtn;
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15 | var muteBtn;
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16 | var progressBar;
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17 |
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18 | var mediaStartPlayTime;
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19 | var mediaStartPauseTime;
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20 | var mediaPlayedNotes;
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21 |
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22 | function initialiseMediaPlayer() {
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23 |
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24 | mediaStartPlayTime = null;
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25 | mediaStartPauseTime = null;
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26 | mediaPlayedNotes = {};
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27 |
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28 | // Get a handle to the player
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29 | mediaPlayer = document.getElementById('video');
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30 |
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31 | // Get handles to each of the buttons and required elements
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32 | playPauseBtn = document.getElementById('play-pause-button');
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33 | muteBtn = document.getElementById('mute-button');
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34 | progressBar = document.getElementById('progress-bar');
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35 |
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36 | // Hide the browser's default controls
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37 | mediaPlayer.controls = false;
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38 |
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39 | // Add a listener for the timeupdate event so we can update the progress bar
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40 | mediaPlayer.addEventListener('timeupdate', updateProgressBar, false);
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41 |
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42 | // Add a listener so the video can be advanced if the progress bar is clicked on
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43 | progressBar.addEventListener("change", progressBarChanged);
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44 |
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45 |
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46 | // Pause the video when the slider handle is being dragged
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47 | progressBar.addEventListener("mousedown", function() {
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48 | mediaPlayer.pause();
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49 | });
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50 |
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51 | // Play the video when the slider handle is dropped
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52 | progressBar.addEventListener("mouseup", function() {
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53 | mediaPlayer.play();
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54 | });
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55 |
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56 | // Add a listener for the play and pause events so the buttons state can be updated
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57 | mediaPlayer.addEventListener('play', function() {
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58 | // Change the button to be a pause button
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59 | changeButtonType(playPauseBtn, 'buttonx2 pause');
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60 | }, false);
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61 | mediaPlayer.addEventListener('pause', function() {
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62 | // Change the button to be a play button
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63 | changeButtonType(playPauseBtn, 'buttonx2 play');
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64 | }, false);
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65 |
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66 | // need to work on this one more...how to know it's muted?
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67 | mediaPlayer.addEventListener('volumechange', function(e) {
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68 | // Update the button to be mute/unmute
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69 | if (mediaPlayer.muted) changeButtonType(muteBtn, 'button unmute');
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70 | else changeButtonType(muteBtn, 'button mute');
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71 | }, false);
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72 | mediaPlayer.addEventListener('ended', function() { this.pause(); }, false);
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73 | }
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74 |
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75 | function togglePlayPause() {
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76 | // If the mediaPlayer is currently paused or has ended
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77 | if (mediaPlayer.paused || mediaPlayer.ended) {
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78 | if (mediaStartPlayTime == null) {
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79 | mediaStartPlayTime = Date.now();
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80 | //console.log("*** mediaStartPlayTime=" + mediaStartPlayTime);
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81 | mediaPlayedNotes[String(mediaStartPlayTime)] = [];
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82 |
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83 | }
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84 | else {
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85 | var mediaPauseBuildup = mediaStartPauseTime - Date.now();
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86 |
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87 | // adjust the start play time to the pause is effectively ignored
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88 | mediaStartPlayTime += mediaPauseBuildup;
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89 | mediaStartPauseTime = null;
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90 |
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91 | }
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92 |
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93 | // Change the button to be a pause button
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94 | changeButtonType(playPauseBtn, 'buttonx2 pause');
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95 | // Play the media
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96 | mediaPlayer.play();
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97 | }
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98 | // Otherwise it must currently be playing
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99 | else {
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100 | mediaPauseTime = Date.now();
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101 |
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102 | // Change the button to be a play button
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103 | changeButtonType(playPauseBtn, 'buttonx2 play');
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104 | // Pause the media
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105 | mediaPlayer.pause();
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106 |
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107 | console.log("*** mediaPlayedNotes = " + JSON.stringify(mediaPlayedNotes));
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108 | }
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109 | }
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110 |
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111 | function pad(n, width, z) {
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112 | z = z || '0';
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113 | n = n + '';
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114 | return n.length >= width ? n : new Array(width - n.length + 1).join(z) + n;
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115 | }
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116 |
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117 | function convertSecsToTimeStr(time)
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118 | {
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119 | var int_mins = Math.floor(time / 60);
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120 |
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121 | var float_secs = time % 60;
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122 | //var int_secs = Math.floor(float_secs);
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123 |
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124 | //var float_sub_sec = float_secs - int_secs;
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125 | //var int_sub_sec = float_sub_sec.toFixed(2)
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126 |
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127 | var padded_secs = pad(float_secs.toFixed(1),4); // (2), 5 for 2 dec place
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128 | return int_mins + ":" + padded_secs
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129 | }
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130 |
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131 |
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132 | function displayCurrentTime()
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133 | {
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134 | var currentTime = mediaPlayer.currentTime;
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135 | var formattedTime = convertSecsToTimeStr(currentTime);
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136 | $('#mediaPlayerCurrentTime').html(formattedTime);
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137 | }
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138 |
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139 | function displayDuration(duration)
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140 | {
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141 | var formattedTime = convertSecsToTimeStr(duration);
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142 | $('#mediaPlayerTotalTime').html(formattedTime);
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143 | }
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144 |
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145 |
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146 | // Stop the current media from playing, and return it to the start position
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147 | function stopPlayer()
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148 | {
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149 | mediaPlayer.pause();
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150 | mediaPlayer.currentTime = 0;
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151 | displayCurrentTime();
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152 | }
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153 |
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154 | // Changes the volume on the media player
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155 | function changeVolume(direction) {
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156 | if (direction === '+') mediaPlayer.volume += mediaPlayer.volume == 1 ? 0 : 0.1;
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157 | else mediaPlayer.volume -= (mediaPlayer.volume == 0 ? 0 : 0.1);
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158 | mediaPlayer.volume = parseFloat(mediaPlayer.volume).toFixed(1);
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159 | }
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160 |
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161 | // Toggles the media player's mute and unmute status
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162 | function toggleMute() {
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163 | if (mediaPlayer.muted) {
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164 | // Change the cutton to be a mute button
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165 | changeButtonType(muteBtn, 'button mute');
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166 | // Unmute the media player
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167 | mediaPlayer.muted = false;
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168 | }
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169 | else {
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170 | // Change the button to be an unmute button
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171 | changeButtonType(muteBtn, 'button unmute');
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172 | // Mute the media player
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173 | mediaPlayer.muted = true;
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174 | }
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175 | }
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176 |
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177 | // Replays the media currently loaded in the player
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178 | function replayMedia() {
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179 | resetPlayer();
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180 | mediaPlayer.play();
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181 | }
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182 |
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183 | // Update the progress bar
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184 | function updateProgressBar() {
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185 | // Work out how much of the media has played via the duration and currentTime parameters
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186 | var percentage = (100 / mediaPlayer.duration) * mediaPlayer.currentTime;
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187 |
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188 | // Update the progress bar's value
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189 | progressBar.value = percentage;
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190 |
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191 | // Update the progress bar's text (for browsers that don't support the progress element)
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192 | progressBar.innerHTML = Math.floor(percentage) + '% played';
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193 |
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194 | displayCurrentTime();
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195 | }
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196 |
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197 | function progressBarChanged() {
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198 | //console.log("**** progress bar changed!")
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199 | // Calculate the new time
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200 | var time = mediaPlayer.duration * (progressBar.value / 100);
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201 |
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202 | // Update the video time
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203 | mediaPlayer.currentTime = time;
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204 | displayCurrentTime();
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205 | }
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206 |
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207 | // Updates a button's title, innerHTML and CSS class to a certain value
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208 | function changeButtonType(btn, value) {
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209 | btn.title = value;
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210 | btn.innerHTML = value;
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211 | btn.className = value;
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212 | }
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213 |
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214 | // Loads a video item into the media player
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215 | function loadVideo() {
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216 | for (var i = 0; i < arguments.length; i++) {
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217 | var file = arguments[i].split('.');
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218 | var ext = file[file.length - 1];
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219 | // Check if this media can be played
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220 | if (canPlayVideo(ext)) {
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221 | // Reset the player, change the source file and load it
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222 | resetPlayer();
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223 | mediaPlayer.src = arguments[i];
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224 | mediaPlayer.load();
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225 | break;
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226 | }
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227 | }
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228 | }
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229 |
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230 | // Checks if the browser can play this particular type of file or not
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231 | function canPlayVideo(ext) {
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232 | var ableToPlay = mediaPlayer.canPlayType('video/' + ext);
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233 | if (ableToPlay == '') return false;
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234 | else return true;
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235 | }
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236 |
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237 | // Resets the media player
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238 | function resetPlayer() {
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239 | mediaStartPlayTime = null;
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240 | mediaStartPauseTime = null;
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241 |
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242 | // Reset the progress bar to 0
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243 | progressBar.value = 0;
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244 | // Move the media back to the start
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245 | mediaPlayer.currentTime = 0;
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246 | displayCurrentTime();
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247 | // Ensure that the play pause button is set as 'play'
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248 | changeButtonType(playPauseBtn, 'play');
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249 | } |
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