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/*
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) 2024 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";
import { JvttCue } from "./jhls.d.ts";
import { get_track_kind } from "./mediacaps.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 abstract class PlayerTrack {
public static async new(player: Player, node_id: string, track_index: number, metadata: SourceTrack): Promise<PlayerTrack | undefined> {
const kind = get_track_kind(metadata.kind)
if (kind == "subtitles") return await VttPlayerTrack.new(player, node_id, track_index, metadata)
else return await MSEPlayerTrack.new(player, node_id, track_index, metadata)
}
constructor(
public track_index: number,
) { }
public buffered = new OVar<BufferRange[]>([]);
public abort = new AbortController()
async update(_target: number) { }
}
export class VttPlayerTrack extends PlayerTrack {
private track: TextTrack
public static async new(player: Player, node_id: string, track_index: number, metadata: SourceTrack): Promise<VttPlayerTrack | undefined> {
try {
const res = await fetch(`/n/${encodeURIComponent(player.node_id)}/stream?format=jvtt&tracks=${track_index}`, { headers: { "Accept": "application/json" } })
if (!res.ok) return player.error.value = "Cannot download index.", undefined
let index!: JvttCue[] & { 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 VttPlayerTrack(player, node_id, track_index, metadata, index)
return t
} catch (e) {
if (e instanceof TypeError) {
player.set_pers("Cannot download subtitles: Network Error")
} else throw e
}
}
constructor(
private player: Player,
private node_id: string,
track_index: number,
private metadata: SourceTrack,
public cues: JvttCue[],
) {
super(track_index)
this.track = this.player.video.addTextTrack("subtitles", metadata.name, metadata.language)
for (const cue of cues) {
const c = new VTTCue(cue.start, cue.end, cue.content);
c.line = -2;
this.track.addCue(c)
}
this.track.mode = "showing"
this.abort.signal.addEventListener("abort", () => {
// TODO disable subtitles properly
this.track.mode = "hidden"
})
}
}
export class MSEPlayerTrack extends PlayerTrack {
public source_buffer!: SourceBuffer;
private current_load?: AppendRange;
private loading = new Set<number>();
private append_queue: AppendRange[] = [];
public profile_selector: ProfileSelector
public profile = new OVar<EncodingProfileExt | undefined>(undefined);
public static async new(player: Player, node_id: string, track_index: number, metadata: SourceTrack): Promise<MSEPlayerTrack | 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 MSEPlayerTrack(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,
track_index: number,
private metadata: SourceTrack,
public index: JhlsTrackIndex,
) {
super(track_index)
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);
}
}
}
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