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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) 2025 metamuffin <metamuffin.org>
*/
import { OVar } from "../../jshelper/mod.ts";
import { test_media_capability, track_to_content_type } from "../mediacaps.ts";
import { BufferRange, Player } from "../player.ts";
import { PlayerTrack, AppendRange, TARGET_BUFFER_DURATION, MIN_BUFFER_DURATION } from "./mod.ts";
import { e } from "../../jshelper/src/element.ts";
import { FormatInfo, FragmentIndex, StreamContainer, TrackInfo } from "../types_stream.ts";
interface UsableFormat { format_index: number, usable_index: number, format: FormatInfo, container: StreamContainer }
export class MSEPlayerTrack extends PlayerTrack {
public source_buffer!: SourceBuffer;
private current_load?: AppendRange;
private loading = new Set<number>();
private append_queue: AppendRange[] = [];
public index?: FragmentIndex
public active_format = new OVar<UsableFormat | undefined>(undefined);
public usable_formats: UsableFormat[] = []
constructor(
private player: Player,
private base_url: string,
private segment_index: number,
track_index: number,
public trackinfo: TrackInfo,
) {
super(track_index);
this.init()
}
async init() {
this.buffered.value = [{ start: 0, end: this.player.duration.value, status: "loading" }]
try {
const res = await fetch(`${this.base_url}?fragmentindex&segment=${this.segment_index}&track=${this.track_index}`, { headers: { "Accept": "application/json" } });
if (!res.ok) return this.player.error.value = "Cannot download index.", undefined;
let index!: FragmentIndex & { error: string; };
try { index = await res.json(); }
catch (_) { this.player.set_pers("Error: Failed to fetch node"); }
if (index.error) return this.player.set_pers("server error: " + index.error), undefined;
this.index = index
} catch (e) {
if (e instanceof TypeError) {
this.player.set_pers("Cannot download index: Network Error");
} else throw e;
}
this.buffered.value = []
console.log(this.trackinfo);
for (let i = 0; i < this.trackinfo.formats.length; i++) {
const format = this.trackinfo.formats[i];
for (const container of format.containers) {
if (container != "webm" && container != "mpeg4") continue;
if (await test_media_capability(format, container))
this.usable_formats.push({ container, format, format_index: i, usable_index: this.usable_formats.length })
}
}
if (!this.usable_formats.length)
return this.player.logger?.log("No availble format is supported by this device. The track can't be played back.")
this.active_format.value = this.usable_formats[0]
const ct = track_to_content_type(this.active_format.value!.format, this.active_format.value!.container);
this.source_buffer = this.player.media_source.addSourceBuffer(ct);
this.abort.signal.addEventListener("abort", () => {
console.log(`destroy source buffer for track ${this.track_index}`);
this.player.media_source.removeSourceBuffer(this.source_buffer);
});
this.source_buffer.mode = "segments";
this.source_buffer.addEventListener("updateend", () => {
if (this.abort.signal.aborted) return;
if (this.current_load) {
this.loading.delete(this.current_load.index);
const cb = this.current_load.cb;
this.current_load = undefined;
cb()
} else {
console.warn("updateend but nothing is loading")
}
this.update_buf_ranges();
this.tick_append();
});
this.source_buffer.addEventListener("error", e => {
console.error("sourcebuffer error", e);
});
this.source_buffer.addEventListener("abort", e => {
console.error("sourcebuffer abort", e);
});
this.update(this.player.video.currentTime)
}
update_buf_ranges() {
if (!this.index) return;
const ranges: BufferRange[] = [];
for (let i = 0; i < this.source_buffer.buffered.length; i++) {
ranges.push({
start: this.source_buffer.buffered.start(i),
end: this.source_buffer.buffered.end(i),
status: "buffered"
});
}
for (const r of this.loading) {
ranges.push({ ...this.index[r], status: "loading" });
}
this.buffered.value = ranges;
}
override async update(target: number) {
if (!this.index) return;
this.update_buf_ranges(); // TODO required?
const blocking = [];
for (let i = 0; i < this.index.length; i++) {
const frag = this.index[i];
if (frag.end < target) continue;
if (frag.start >= target + TARGET_BUFFER_DURATION) break;
if (!this.check_buf_collision(frag.start, frag.end)) continue;
if (frag.start <= target + MIN_BUFFER_DURATION)
blocking.push(this.load(i));
else
this.load(i);
}
await Promise.all(blocking);
}
check_buf_collision(start: number, end: number) {
const EPSILON = 0.01;
for (const r of this.buffered.value)
if (r.end - EPSILON > start && r.start < end - EPSILON)
return false;
return true;
}
async load(index: number) {
this.loading.add(index);
// TODO update format selection
const url = `${this.base_url}?fragment&segment=${this.segment_index}&track=${this.track_index}&format=${this.active_format.value!.format_index}&index=${index}&container=${this.active_format.value!.container}`;
const buf = await this.player.downloader.download(url);
await new Promise<void>(cb => {
if (!this.index) return;
if (this.abort.signal.aborted) return;
this.append_queue.push({ buf, ...this.index[index], index, cb });
this.tick_append();
});
}
tick_append() {
if (this.source_buffer.updating || this.current_load) return;
if (this.append_queue.length) {
const frag = this.append_queue[0];
this.append_queue.splice(0, 1);
this.current_load = frag;
// TODO why is appending so unreliable?! sometimes it does not add it
this.source_buffer.changeType(track_to_content_type(this.active_format.value!.format, this.active_format.value!.container));
this.source_buffer.timestampOffset = this.active_format.value?.format.remux ? 0 : frag.start
console.log(`append track at ${this.source_buffer.timestampOffset} ${this.trackinfo.kind} ${this.track_index}`);
this.source_buffer.appendBuffer(frag.buf);
}
}
public debug(): OVar<HTMLElement> {
const rtype = (t: string, b: BufferRange[]) => {
const c = b.filter(r => r.status == t);
// ${c.length} range${c.length != 1 ? "s" : ""}
return `${c.reduce((a, v) => a + v.end - v.start, 0).toFixed(2)}s`
}
return this.active_format.liftA2(this.buffered, (p, b) =>
e("pre",
p ?
`mse track ${this.track_index}: format ${p.format_index} (${p.format.remux ? "remux" : "transcode"})`
+ `\n\ttype: ${track_to_content_type(p.format, p.container)} br=${p.format.bitrate}`
+ `\n\tbuffered: ${rtype("buffered", b)} / queued: ${rtype("queued", b)} / loading: ${rtype("loading", b)}`
: ""
) as HTMLElement
)
}
}
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