playlist-loader_test.js
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(function(window) {
'use strict';
var
sinonXhr,
clock,
requests,
videojs = window.videojs,
// Attempts to produce an absolute URL to a given relative path
// based on window.location.href
urlTo = function(path) {
return window.location.href
.split('/')
.slice(0, -1)
.concat([path])
.join('/');
};
module('Playlist Loader', {
setup: function() {
// fake XHRs
sinonXhr = sinon.useFakeXMLHttpRequest();
requests = [];
sinonXhr.onCreate = function(xhr) {
requests.push(xhr);
};
// fake timers
clock = sinon.useFakeTimers();
},
teardown: function() {
sinonXhr.restore();
clock.restore();
}
});
test('throws if the playlist url is empty or undefined', function() {
throws(function() {
videojs.Hls.PlaylistLoader();
}, 'requires an argument');
throws(function() {
videojs.Hls.PlaylistLoader('');
}, 'does not accept the empty string');
});
test('starts without any metadata', function() {
var loader = new videojs.Hls.PlaylistLoader('master.m3u8');
strictEqual(loader.state, 'HAVE_NOTHING', 'no metadata has loaded yet');
});
test('requests the initial playlist immediately', function() {
new videojs.Hls.PlaylistLoader('master.m3u8');
strictEqual(requests.length, 1, 'made a request');
strictEqual(requests[0].url, 'master.m3u8', 'requested the initial playlist');
});
test('moves to HAVE_MASTER after loading a master playlist', function() {
var loader = new videojs.Hls.PlaylistLoader('master.m3u8');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-STREAM-INF:\n' +
'media.m3u8\n');
ok(loader.master, 'the master playlist is available');
strictEqual(loader.state, 'HAVE_MASTER', 'the state is correct');
});
test('jumps to HAVE_METADATA when initialized with a media playlist', function() {
var
loadedmetadatas = 0,
loader = new videojs.Hls.PlaylistLoader('media.m3u8');
loader.on('loadedmetadata', function() {
loadedmetadatas++;
});
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXTINF:10,\n' +
'0.ts\n' +
'#EXT-X-ENDLIST\n');
ok(loader.master, 'infers a master playlist');
ok(loader.media(), 'sets the media playlist');
ok(loader.media().uri, 'sets the media playlist URI');
strictEqual(loader.state, 'HAVE_METADATA', 'the state is correct');
strictEqual(requests.length, 0, 'no more requests are made');
strictEqual(loadedmetadatas, 1, 'fired one loadedmetadata');
});
test('jumps to HAVE_METADATA when initialized with a live media playlist', function() {
var loader = new videojs.Hls.PlaylistLoader('media.m3u8');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXTINF:10,\n' +
'0.ts\n');
ok(loader.master, 'infers a master playlist');
ok(loader.media(), 'sets the media playlist');
strictEqual(loader.state, 'HAVE_METADATA', 'the state is correct');
});
test('moves to HAVE_METADATA after loading a media playlist', function() {
var
loadedPlaylist = 0,
loadedMetadata = 0,
loader = new videojs.Hls.PlaylistLoader('master.m3u8');
loader.on('loadedplaylist', function() {
loadedPlaylist++;
});
loader.on('loadedmetadata', function() {
loadedMetadata++;
});
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-STREAM-INF:\n' +
'media.m3u8\n' +
'alt.m3u8\n');
strictEqual(loadedPlaylist, 1, 'fired loadedplaylist once');
strictEqual(loadedMetadata, 0, 'did not fire loadedmetadata');
strictEqual(requests.length, 1, 'requests the media playlist');
strictEqual(requests[0].method, 'GET', 'GETs the media playlist');
strictEqual(requests[0].url,
urlTo('media.m3u8'),
'requests the first playlist');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXTINF:10,\n' +
'0.ts\n');
ok(loader.master, 'sets the master playlist');
ok(loader.media(), 'sets the media playlist');
strictEqual(loadedPlaylist, 2, 'fired loadedplaylist twice');
strictEqual(loadedMetadata, 1, 'fired loadedmetadata once');
strictEqual(loader.state, 'HAVE_METADATA', 'the state is correct');
});
test('moves to HAVE_CURRENT_METADATA when refreshing the playlist', function() {
var loader = new videojs.Hls.PlaylistLoader('live.m3u8');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXTINF:10,\n' +
'0.ts\n');
clock.tick(10 * 1000); // 10s, one target duration
strictEqual(loader.state, 'HAVE_CURRENT_METADATA', 'the state is correct');
strictEqual(requests.length, 1, 'requested playlist');
strictEqual(requests[0].url,
urlTo('live.m3u8'),
'refreshes the media playlist');
});
test('returns to HAVE_METADATA after refreshing the playlist', function() {
var loader = new videojs.Hls.PlaylistLoader('live.m3u8');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXTINF:10,\n' +
'0.ts\n');
clock.tick(10 * 1000); // 10s, one target duration
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXTINF:10,\n' +
'1.ts\n');
strictEqual(loader.state, 'HAVE_METADATA', 'the state is correct');
});
test('emits an error when an initial playlist request fails', function() {
var
errors = [],
loader = new videojs.Hls.PlaylistLoader('master.m3u8');
loader.on('error', function() {
errors.push(loader.error);
});
requests.pop().respond(500);
strictEqual(errors.length, 1, 'emitted one error');
strictEqual(errors[0].status, 500, 'http status is captured');
});
test('errors when an initial media playlist request fails', function() {
var
errors = [],
loader = new videojs.Hls.PlaylistLoader('master.m3u8');
loader.on('error', function() {
errors.push(loader.error);
});
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-STREAM-INF:\n' +
'media.m3u8\n');
strictEqual(errors.length, 0, 'emitted no errors');
requests.pop().respond(500);
strictEqual(errors.length, 1, 'emitted one error');
strictEqual(errors[0].status, 500, 'http status is captured');
});
// http://tools.ietf.org/html/draft-pantos-http-live-streaming-12#section-6.3.4
test('halves the refresh timeout if a playlist is unchanged' +
'since the last reload', function() {
new videojs.Hls.PlaylistLoader('live.m3u8');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-MEDIA-SEQUENCE:0\n' +
'#EXTINF:10,\n' +
'0.ts\n');
clock.tick(10 * 1000); // trigger a refresh
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-MEDIA-SEQUENCE:0\n' +
'#EXTINF:10,\n' +
'0.ts\n');
clock.tick(5 * 1000); // half the default target-duration
strictEqual(requests.length, 1, 'sent a request');
strictEqual(requests[0].url,
urlTo('live.m3u8'),
'requested the media playlist');
});
test('media-sequence updates are considered a playlist change', function() {
new videojs.Hls.PlaylistLoader('live.m3u8');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-MEDIA-SEQUENCE:0\n' +
'#EXTINF:10,\n' +
'0.ts\n');
clock.tick(10 * 1000); // trigger a refresh
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-MEDIA-SEQUENCE:1\n' +
'#EXTINF:10,\n' +
'0.ts\n');
clock.tick(5 * 1000); // half the default target-duration
strictEqual(requests.length, 0, 'no request is sent');
});
test('emits an error if a media refresh fails', function() {
var
errors = 0,
loader = new videojs.Hls.PlaylistLoader('live.m3u8');
loader.on('error', function() {
errors++;
});
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-MEDIA-SEQUENCE:0\n' +
'#EXTINF:10,\n' +
'0.ts\n');
clock.tick(10 * 1000); // trigger a refresh
requests.pop().respond(500);
strictEqual(errors, 1, 'emitted an error');
strictEqual(loader.error.status, 500, 'captured the status code');
});
test('switches media playlists when requested', function() {
var loader = new videojs.Hls.PlaylistLoader('master.m3u8');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-STREAM-INF:BANDWIDTH=1\n' +
'low.m3u8\n' +
'#EXT-X-STREAM-INF:BANDWIDTH=2\n' +
'high.m3u8\n');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-MEDIA-SEQUENCE:0\n' +
'#EXTINF:10,\n' +
'low-0.ts\n');
loader.media(loader.master.playlists[1]);
strictEqual(loader.state, 'SWITCHING_MEDIA', 'updated the state');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-MEDIA-SEQUENCE:0\n' +
'#EXTINF:10,\n' +
'high-0.ts\n');
strictEqual(loader.state, 'HAVE_METADATA', 'switched active media');
strictEqual(loader.media(),
loader.master.playlists[1],
'updated the active media');
});
test('can switch media playlists based on URI', function() {
var loader = new videojs.Hls.PlaylistLoader('master.m3u8');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-STREAM-INF:BANDWIDTH=1\n' +
'low.m3u8\n' +
'#EXT-X-STREAM-INF:BANDWIDTH=2\n' +
'high.m3u8\n');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-MEDIA-SEQUENCE:0\n' +
'#EXTINF:10,\n' +
'low-0.ts\n');
loader.media('high.m3u8');
strictEqual(loader.state, 'SWITCHING_MEDIA', 'updated the state');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-MEDIA-SEQUENCE:0\n' +
'#EXTINF:10,\n' +
'high-0.ts\n');
strictEqual(loader.state, 'HAVE_METADATA', 'switched active media');
strictEqual(loader.media(),
loader.master.playlists[1],
'updated the active media');
});
test('aborts in-flight playlist refreshes when switching', function() {
var loader = new videojs.Hls.PlaylistLoader('master.m3u8');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-STREAM-INF:BANDWIDTH=1\n' +
'low.m3u8\n' +
'#EXT-X-STREAM-INF:BANDWIDTH=2\n' +
'high.m3u8\n');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-MEDIA-SEQUENCE:0\n' +
'#EXTINF:10,\n' +
'low-0.ts\n');
clock.tick(10 * 1000);
loader.media('high.m3u8');
strictEqual(requests[0].aborted, true, 'aborted refresh request');
strictEqual(loader.state, 'SWITCHING_MEDIA', 'updated the state');
});
test('switching to the active playlist is a no-op', function() {
var loader = new videojs.Hls.PlaylistLoader('master.m3u8');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-STREAM-INF:BANDWIDTH=1\n' +
'low.m3u8\n' +
'#EXT-X-STREAM-INF:BANDWIDTH=2\n' +
'high.m3u8\n');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-MEDIA-SEQUENCE:0\n' +
'#EXTINF:10,\n' +
'low-0.ts\n' +
'#EXT-X-ENDLIST\n');
loader.media('low.m3u8');
strictEqual(requests.length, 0, 'no requests is sent');
});
test('throws an error if a media switch is initiated too early', function() {
var loader = new videojs.Hls.PlaylistLoader('master.m3u8');
throws(function() {
loader.media('high.m3u8');
}, 'threw an error from HAVE_NOTHING');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-STREAM-INF:BANDWIDTH=1\n' +
'low.m3u8\n' +
'#EXT-X-STREAM-INF:BANDWIDTH=2\n' +
'high.m3u8\n');
throws(function() {
loader.media('high.m3u8');
}, 'throws an error from HAVE_MASTER');
});
test('throws an error if a switch to an unrecognized playlist is requested', function() {
var loader = new videojs.Hls.PlaylistLoader('master.m3u8');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-STREAM-INF:BANDWIDTH=1\n' +
'media.m3u8\n');
throws(function() {
loader.media('unrecognized.m3u8');
}, 'throws an error');
});
test('dispose cancels the refresh timeout', function() {
var loader = new videojs.Hls.PlaylistLoader('live.m3u8');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-MEDIA-SEQUENCE:0\n' +
'#EXTINF:10,\n' +
'0.ts\n');
loader.dispose();
// a lot of time passes...
clock.tick(15 * 1000);
strictEqual(requests.length, 0, 'no refresh request was made');
});
test('dispose aborts pending refresh requests', function() {
var loader = new videojs.Hls.PlaylistLoader('live.m3u8');
requests.pop().respond(200, null,
'#EXTM3U\n' +
'#EXT-X-MEDIA-SEQUENCE:0\n' +
'#EXTINF:10,\n' +
'0.ts\n');
clock.tick(10 * 1000);
loader.dispose();
ok(requests[0].aborted, 'refresh request aborted');
});
})(window);