b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
107 lines
3 KiB
JavaScript
Executable file
107 lines
3 KiB
JavaScript
Executable file
'use strict';
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/* global dump, MediaUtils */
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/* exported VideoStats */
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//
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// VideoStats records video playback statistics and
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// dumps them to the native console
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//
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var VideoStats = (function() {
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var startQuality;
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var startTime;
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var endQuality;
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var endTime;
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var video;
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// Start recording stats
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function start(v) {
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video = v;
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if (!video.getVideoPlaybackQuality) {
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// This API is needed to record stats.
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// It is enabled in gecko by setting
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// the media.mediasource.enabled pref to true.
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return;
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}
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startQuality = video.getVideoPlaybackQuality();
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startTime = video.currentTime;
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endQuality = null;
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endTime = null;
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}
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// Stop recording stats
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function stop() {
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if (!video) {
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dump('Warning: no stats have been recorded. ' +
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'Make sure start() has been called');
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return;
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}
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if (!video.getVideoPlaybackQuality) {
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// This API is needed to record stats.
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// It is enabled in gecko by setting
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// the media.mediasource.enabled pref to true.
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return;
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}
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endQuality = video.getVideoPlaybackQuality();
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endTime = video.currentTime;
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}
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// Dump stats to the native console
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function print() {
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if (!video) {
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dump('Warning: no stats have been recorded. ' +
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'Make sure start() has been called');
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return;
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}
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if (!video.getVideoPlaybackQuality) {
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// This API is needed to record stats.
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// It is enabled in gecko by setting
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// the media.mediasource.enabled pref to true.
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return;
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}
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if (!startQuality || !endQuality) {
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dump('Warning: no stats have been recorded. ' +
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'Make sure start() and stop() have been called');
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return;
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}
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// Playback segment duration in seconds
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var segmentDuration =
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(endQuality.creationTime - startQuality.creationTime) / 1000;
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var startRendered =
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startQuality.totalVideoFrames - startQuality.droppedVideoFrames;
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var endRendered =
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endQuality.totalVideoFrames - endQuality.droppedVideoFrames;
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var segmentRendered = endRendered - startRendered;
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var fps = segmentRendered / segmentDuration;
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dump('Video statistics start');
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dump('Dimensions: ' + video.videoWidth + 'x' + video.videoHeight);
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dump('Complete duration: ' + MediaUtils.formatDuration(video.duration));
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dump('Start time: ' + MediaUtils.formatDuration(startTime));
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dump('End time: ' + MediaUtils.formatDuration(endTime));
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dump('Total frames: ' + endQuality.totalVideoFrames);
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dump('Decoded frames: ' +
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(endQuality.totalVideoFrames - endQuality.corruptedVideoFrames));
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dump('Corrupted frames: ' + endQuality.corruptedVideoFrames);
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dump('Rendered frames: ' +
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(endQuality.totalVideoFrames - endQuality.droppedVideoFrames));
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dump('Dropped frames: ' + endQuality.droppedVideoFrames);
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dump('Average rendered FPS: ' + fps.toFixed(2));
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dump('Video statistics end');
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}
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return {
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start: start,
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stop: stop,
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dump: print
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};
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})();
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