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11452ec | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | import { Component, EventEmitter, Input, OnInit, Output } from '@angular/core';
import { PostsService } from 'app/posts.services';
@Component({
selector: 'app-concurrent-stream',
templateUrl: './concurrent-stream.component.html',
styleUrls: ['./concurrent-stream.component.scss']
})
export class ConcurrentStreamComponent implements OnInit {
@Input() server_mode = false;
@Input() playback_timestamp;
@Input() playing;
@Input() uid;
@Output() setPlaybackTimestamp = new EventEmitter<any>();
@Output() togglePlayback = new EventEmitter<boolean>();
@Output() setPlaybackRate = new EventEmitter<number>();
started = false;
server_started = false;
watch_together_clicked = false;
server_already_exists = null;
check_timeout: any;
update_timeout: any;
PLAYBACK_TIMESTAMP_DIFFERENCE_THRESHOLD_PLAYBACK_MODIFICATION = 0.5;
PLAYBACK_TIMESTAMP_DIFFERENCE_THRESHOLD_SKIP = 2;
PLAYBACK_MODIFIER = 0.1;
playback_rate_modified = false;
constructor(private postsService: PostsService) { }
// flow: click start watching -> check for available stream to enable join button and if user, display "start stream"
// users who join a stream will send continuous requests for info on playback
ngOnInit(): void {
}
ngOnDestroy(): void {
if (this.check_timeout) { clearInterval(this.check_timeout); }
if (this.update_timeout) { clearInterval(this.update_timeout); }
}
startServer() {
this.started = true;
this.server_started = true;
this.update_timeout = setInterval(() => {
this.updateStream();
}, 1000);
}
updateStream() {
this.postsService.updateConcurrentStream(this.uid, this.playback_timestamp, Date.now()/1000, this.playing).subscribe(res => {
});
}
startClient() {
this.started = true;
}
checkStream() {
if (this.server_started) { return; }
const current_playback_timestamp = this.playback_timestamp;
const current_unix_timestamp = Date.now()/1000;
this.postsService.checkConcurrentStream(this.uid).subscribe(res => {
const stream = res['stream'];
if (!stream) {
this.server_already_exists = false;
return;
}
this.server_already_exists = true;
// check whether client has joined the stream
if (!this.started) { return; }
if (!stream['playing'] && this.playing) {
// tell client to pause and set the timestamp to sync
this.togglePlayback.emit(false);
this.setPlaybackTimestamp.emit(stream['playback_timestamp']);
} else if (stream['playing']) {
// sync unpause state
if (!this.playing) { this.togglePlayback.emit(true); }
// sync time
const zeroed_local_unix_timestamp = current_unix_timestamp - current_playback_timestamp;
const zeroed_server_unix_timestamp = stream['unix_timestamp'] - stream['playback_timestamp'];
const seconds_behind_locally = zeroed_local_unix_timestamp - zeroed_server_unix_timestamp;
if (Math.abs(seconds_behind_locally) > this.PLAYBACK_TIMESTAMP_DIFFERENCE_THRESHOLD_SKIP) {
// skip to playback timestamp because the difference is too high
this.setPlaybackTimestamp.emit(this.playback_timestamp + seconds_behind_locally + 0.3);
this.playback_rate_modified = false;
} else if (!this.playback_rate_modified && Math.abs(seconds_behind_locally) > this.PLAYBACK_TIMESTAMP_DIFFERENCE_THRESHOLD_PLAYBACK_MODIFICATION) {
// increase playback speed to avoid skipping
let seconds_to_wait = (Math.abs(seconds_behind_locally)/this.PLAYBACK_MODIFIER);
seconds_to_wait += 0.3/this.PLAYBACK_MODIFIER;
this.playback_rate_modified = true;
if (seconds_behind_locally > 0) {
// increase speed
this.setPlaybackRate.emit(1 + this.PLAYBACK_MODIFIER);
setTimeout(() => {
this.setPlaybackRate.emit(1);
this.playback_rate_modified = false;
}, seconds_to_wait * 1000);
} else {
// decrease speed
this.setPlaybackRate.emit(1 - this.PLAYBACK_MODIFIER);
setTimeout(() => {
this.setPlaybackRate.emit(1);
this.playback_rate_modified = false;
}, seconds_to_wait * 1000);
}
}
}
});
}
startWatching() {
this.watch_together_clicked = true;
this.check_timeout = setInterval(() => {
this.checkStream();
}, 1000);
}
stop() {
if (this.check_timeout) { clearInterval(this.check_timeout); }
if (this.update_timeout) { clearInterval(this.update_timeout); }
this.started = false;
this.server_started = false;
this.watch_together_clicked = false;
}
}
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