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
147
148
149
|
/*
This file is part of jellything (https://codeberg.org/metamuffin/jellything)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2023 metamuffin <metamuffin.org>
*/
/// <reference lib="dom" />
import { JhlsTrackIndex, SourceTrack, TimeRange } from "./jhls.d.ts";
import { OVar } from "../jshelper/mod.ts";
import { profile_to_partial_track, track_to_content_type } from "./mediacaps.ts";
import { BufferRange, Player } from "./player.ts";
import { EncodingProfileExt, ProfileSelector } from "./profiles.ts";
export const TARGET_BUFFER_DURATION = 10
export const MIN_BUFFER_DURATION = 1
export interface AppendRange extends TimeRange { buf: ArrayBuffer, index: number, cb: () => void }
export class PlayerTrack {
private source_buffer!: SourceBuffer;
private current_load?: AppendRange;
private loading = new Set<number>();
public buffered = new OVar<BufferRange[]>([]);
private append_queue: AppendRange[] = [];
public profile = new OVar<EncodingProfileExt | undefined>(undefined);
public profile_selector: ProfileSelector
public abort = new AbortController()
public static async new(player: Player, node_id: string, track_index: number, metadata: SourceTrack): Promise<PlayerTrack | undefined> {
try {
const res = await fetch(`/n/${encodeURIComponent(player.node_id)}/stream?format=jhlsi&tracks=${track_index}`, { headers: { "Accept": "application/json" } })
if (!res.ok) return player.error.value = "Cannot download index.", undefined
let index!: JhlsTrackIndex & { error: string }
try { index = await res.json() }
catch (_) { player.set_pers("Error: Failed to fetch node") }
if (index.error) return player.set_pers("server error: " + index.error), undefined
const t = new PlayerTrack(player, node_id, track_index, metadata, index)
await t.init()
return t
} catch (e) {
if (e instanceof TypeError) {
player.set_pers("Cannot download index: Network Error")
} else throw e
}
}
constructor(
private player: Player,
private node_id: string,
public track_index: number,
private metadata: SourceTrack,
public index: JhlsTrackIndex,
) {
this.profile_selector = new ProfileSelector(player, this, player.downloader.bandwidth)
}
async init() {
await this.profile_selector.select_optimal_profile(this.track_index, this.profile);
const ct = track_to_content_type(this.track_from_profile())!
console.log(`track ${this.track_index} source buffer content-type: ${ct}`);
this.source_buffer = this.player.media_source.addSourceBuffer(ct);
this.abort.signal.addEventListener("abort", () => {
console.log(`destroy source buffer for track ${this.track_index}`);
this.player.media_source.removeSourceBuffer(this.source_buffer)
})
this.source_buffer.mode = "segments";
this.source_buffer.addEventListener("updateend", () => {
if (this.abort.signal.aborted) return
if (this.current_load) {
this.current_load.cb();
this.loading.delete(this.current_load.index);
this.current_load = undefined;
}
this.update_buf_ranges();
this.tick_append();
});
this.source_buffer.addEventListener("error", e => {
console.error("sourcebuffer error", e);
});
this.source_buffer.addEventListener("abort", e => {
console.error("sourcebuffer abort", e);
});
}
track_from_profile(): SourceTrack {
if (this.profile.value) return profile_to_partial_track(this.profile.value)
else return this.metadata
}
update_buf_ranges() {
const ranges: BufferRange[] = [];
for (let i = 0; i < this.source_buffer.buffered.length; i++) {
ranges.push({
start: this.source_buffer.buffered.start(i),
end: this.source_buffer.buffered.end(i),
status: "buffered"
});
}
for (const r of this.loading) {
ranges.push({ ...this.index.segments[r], status: "loading" });
}
this.buffered.value = ranges;
}
async update(target: number) {
this.update_buf_ranges(); // TODO required?
const blocking = [];
for (let i = 0; i < this.index.segments.length; i++) {
const seg = this.index.segments[i];
if (seg.end < target) continue;
if (seg.start >= target + TARGET_BUFFER_DURATION) break;
if (!this.check_buf_collision(seg.start, seg.end)) continue;
if (seg.start <= target + MIN_BUFFER_DURATION)
blocking.push(this.load(i));
else
this.load(i);
}
await Promise.all(blocking);
}
check_buf_collision(start: number, end: number) {
const EPSILON = 0.01;
for (const r of this.buffered.value)
if (r.end - EPSILON > start && r.start < end - EPSILON)
return false;
return true;
}
async load(index: number) {
this.loading.add(index);
await this.profile_selector.select_optimal_profile(this.track_index, this.profile);
const url = `/n/${encodeURIComponent(this.node_id)}/stream?format=snippet&webm=true&tracks=${this.track_index}&index=${index}${this.profile.value ? `&profile=${this.profile.value.id}` : ""}`;
const buf = await this.player.downloader.download(url);
await new Promise<void>(cb => {
if (this.abort.signal.aborted) return
this.append_queue.push({ buf, ...this.index.segments[index], index, cb });
this.tick_append();
});
}
tick_append() {
if (this.source_buffer.updating) return;
if (this.append_queue.length) {
const seg = this.append_queue[0];
this.append_queue.splice(0, 1);
this.current_load = seg;
// TODO why is appending so unreliable?! sometimes it does not add it
this.source_buffer.changeType(track_to_content_type(this.track_from_profile())!);
this.source_buffer.timestampOffset = seg.start;
this.source_buffer.appendBuffer(seg.buf);
}
}
}
|
