refactor(viewer): modularize HLS playback tracking with per-panel state machine
CI / test (pull_request) Successful in 27s
CI / test (pull_request) Successful in 27s
Decompose monolithic wirePlaybackTracking() into single-responsibility modules: - PanelState: per-panel playback state (phase, segments, buffer, quality) - EventWiring: attaches hls.js + video element event listeners - BufferMonitor: periodic buffer health check with timer lifecycle - PanelRenderer: per-panel overlay rendering (phase, quality, segments) - AggregateRenderer: global status bar aggregating all panel states - PanelFactory: DOM panel creation + HLS/direct playback routing Each module handles one concern: state tracking, event registration, buffer monitoring, overlay rendering, aggregate rendering, or DOM creation. Also fix: walk() dead code bug in m3u8DeepProbeFn where the string check was unreachable behind the object-type guard.
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@@ -6,6 +6,7 @@ import './viewer_units.test.mjs';
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import './data_flow.test.mjs';
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import './viewer_integration.test.mjs';
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import './config_validation.test.mjs';
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import './hls_qa.test.mjs';
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import { run } from './runner.mjs';
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const result = await run();
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+2
-1
@@ -105,7 +105,7 @@ function m3u8DeepProbeFn() {
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const seen = new Set();
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function walk(obj, path, depth) {
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if (!obj || typeof obj !== 'object' || depth > 5) return;
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if (depth > 5) return;
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if (typeof obj === 'string') {
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const match = obj.match(/https?:\/\/[^"'\s`)]+\.m3u8[^"'\s`)]*/gi);
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if (match) {
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@@ -115,6 +115,7 @@ function m3u8DeepProbeFn() {
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}
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return;
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}
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if (!obj || typeof obj !== 'object') return;
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for (const k of Object.keys(obj)) {
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walk(obj[k], `${path}.${k}`, depth + 1);
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}
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+180
-143
@@ -3,7 +3,15 @@
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* Reads video URLs from chrome.storage and renders them in a dynamic NxN grid.
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* Supports HLS playback via hls.js (dynamic CDN load) and direct MP4/WebM.
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*
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* Fragmented playback tracking:
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* Modular architecture:
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*
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* PanelState — per-panel playback state (phase, segments, buffer, quality)
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* EventWiring — attaches hls.js + video element event listeners
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* BufferMonitor — periodic buffer health check + timer lifecycle
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* PanelRenderer — per-panel overlay rendering (phase, quality, segments)
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* AggregateRenderer — global status bar aggregating all panel states
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* PanelFactory — DOM panel creation + HLS/direct playback routing
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*
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* HLS delivery is inherently segmented (fragments load one at a time into
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* the MediaSource buffer). This module tracks the broken-up nature of
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* playback by wiring hls.js events for fragment loading, buffer updates,
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@@ -44,42 +52,41 @@ const panelsEl = document.getElementById('panels');
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/** Track all Hls instances so we can destroy them on unload. */
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const hlsInstances = new Map();
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/**
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* Per-panel playback state for fragmented HLS tracking.
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*
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* Each entry tracks the lifecycle of an HLS stream from manifest load
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* through fragment arrivals, buffer growth, and quality switches.
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/**
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* @typedef {object} PanelState
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* @property {'idle'|'loading'|'buffering'|'playing'|'error'} phase
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* Current playback phase of this panel.
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* @property {number} segmentsLoaded
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* Count of FRAG_LOADED events since panel creation.
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* @property {number} segmentsFailed
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* Count of non-fatal FRAG_LOAD_ERROR events.
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* @property {number} level
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* Current quality level index (-1 until MANIFEST_PARSED).
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* @property {string} levelLabel
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* Human-readable quality label (e.g. "1280x720").
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* @property {number} bufferedAhead
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* Seconds of content buffered ahead of current playback position.
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* @property {number} fpsDropCount
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* Count of FPS_DROP events (indicates GPU / decoding pressure).
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* @property {string} lastEvent
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* Most recent hls.js event name (for debug).
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* @property {number} lastActivity
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* Timestamp (Date.now) of the most recent event activity.
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* @property {string|null} errorMessage
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* Last error message, cleared on recovery.
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* @property {number} currentTime
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* Current playback position in seconds (from video.currentTime).
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* @property {number} duration
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* Total media duration in seconds (from video.duration).
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*/
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/* ======================================================================== */
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/* PanelState — per-panel playback state */
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/* ======================================================================== */
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/** Map<video, PanelState> — one state object per video panel. */
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const panelStates = new Map();
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/**
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* @typedef {object} PanelState
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* @property {'idle'|'loading'|'buffering'|'playing'|'error'} phase
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* Current playback phase of this panel.
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* @property {number} segmentsLoaded
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* Count of FRAG_LOADED events since panel creation.
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* @property {number} segmentsFailed
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* Count of non-fatal FRAG_LOAD_ERROR events.
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* @property {number} level
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* Current quality level index (-1 until MANIFEST_PARSED).
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* @property {string} levelLabel
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* Human-readable quality label (e.g. "1280x720").
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* @property {number} bufferedAhead
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* Seconds of content buffered ahead of current playback position.
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* @property {number} fpsDropCount
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* Count of FPS_DROP events (indicates GPU / decoding pressure).
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* @property {string} lastEvent
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* Most recent hls.js event name (for debug).
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* @property {number} lastActivity
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* Timestamp (Date.now) of the most recent event activity.
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* @property {string|null} errorMessage
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* Last error message, cleared on recovery.
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* @property {number} currentTime
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* Current playback position in seconds (from video.currentTime).
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* @property {number} duration
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* Total media duration in seconds (from video.duration).
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*/
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/**
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* Initialize a fresh PanelState for a video element.
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*/
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@@ -95,7 +102,6 @@ function createPanelState() {
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lastEvent: 'none',
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lastActivity: 0,
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errorMessage: null,
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// Playback position tracking — updated by timeupdate events.
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// HLS delivers fragments out-of-order, but the browser plays them back
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// sequentially. currentTime and duration give the user-facing progress.
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currentTime: 0,
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@@ -104,22 +110,26 @@ function createPanelState() {
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}
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/* ======================================================================== */
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/* HLS helpers */
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/* Buffer helpers */
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/* ======================================================================== */
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/** Destroy the Hls instance attached to a video element (if any). */
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function destroyHls(video) {
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const inst = hlsInstances.get(video);
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if (inst) {
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inst.destroy();
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hlsInstances.delete(video);
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/**
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* Compute buffered seconds ahead of current playback position.
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* Returns 0 if the video has no buffered ranges or is not playing.
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*/
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function getBufferedAhead(video) {
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if (!video.buffered || video.buffered.length === 0) return 0;
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const current = video.currentTime;
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for (let i = 0; i < video.buffered.length; i++) {
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if (video.buffered.end(i) > current) {
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return video.buffered.end(i) - current;
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}
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}
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panelStates.delete(video);
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removePanelOverlay(video);
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return 0;
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}
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/* ======================================================================== */
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/* Panel overlay helpers */
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/* PanelRenderer — per-panel overlay rendering */
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/* ======================================================================== */
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/**
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@@ -152,9 +162,23 @@ function removePanelOverlay(video) {
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}
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}
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/**
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* Phase emoji indicators for overlay display.
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*/
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const PHASE_ICONS = {
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idle: '\u23F8', // pause
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loading: '\u2B07', // down arrow
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buffering: '\u27F7', // spinning
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playing: '\u25B6', // play
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error: '\u2717', // X
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};
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/**
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* Render the current PanelState into the overlay.
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* Shows: phase indicator, quality, segments loaded/failed, buffer ahead.
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*
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* This function is intentionally rendering-only — it reads state, formats it,
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* and writes to the DOM. No side effects beyond setting aggregateStateDirty.
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*/
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function renderPanelState(video, panel) {
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const state = panelStates.get(video);
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@@ -166,40 +190,31 @@ function renderPanelState(video, panel) {
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panelOverlays.set(video, overlay);
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}
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// Phase emoji/indicator
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const phaseIcons = {
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idle: '⏸',
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loading: '⬇',
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buffering: '◷',
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playing: '▶',
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error: '✗',
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};
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// Build status lines
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const lines = [];
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lines.push(`${phaseIcons[state.phase] || '?'} ${state.phase}`);
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lines.push(`${PHASE_ICONS[state.phase] || '?'} ${state.phase}`);
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if (state.level >= 0) {
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lines.push(`📺 ${state.levelLabel}`);
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lines.push(`\uD83D\uDD7A\uFE0F ${state.levelLabel}`);
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}
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if (state.segmentsLoaded > 0) {
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const segText = state.segmentsFailed > 0
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? `📦 ${state.segmentsLoaded} seg (+${state.segmentsFailed} fail)`
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: `📦 ${state.segmentsLoaded} seg`;
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? `\uD83D\uDCE6 ${state.segmentsLoaded} seg (+${state.segmentsFailed} fail)`
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: `\uD83D\uDCE6 ${state.segmentsLoaded} seg`;
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lines.push(segText);
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}
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lines.push(`💾 ${state.bufferedAhead.toFixed(1)}s buf`);
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lines.push(`\uD83D\uDCBE ${state.bufferedAhead.toFixed(1)}s buf`);
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// Playback progress: currentTime / duration (only when known)
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if (state.duration > 0) {
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const pct = ((state.currentTime / state.duration) * 100).toFixed(0);
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lines.push(`⏱ ${state.currentTime.toFixed(1)}s / ${state.duration.toFixed(0)}s (${pct}%)`);
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lines.push(`\u23F1 ${state.currentTime.toFixed(1)}s / ${state.duration.toFixed(0)}s (${pct}%)`);
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} else if (state.currentTime > 0) {
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lines.push(`⏱ ${state.currentTime.toFixed(1)}s (live/loop)`);
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lines.push(`\u23F1 ${state.currentTime.toFixed(1)}s (live/loop)`);
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}
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if (state.fpsDropCount > 0) {
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lines.push(`⚠ ${state.fpsDropCount} fps-drop`);
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lines.push(`\u26A0 ${state.fpsDropCount} fps-drop`);
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}
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if (state.errorMessage) {
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lines.push(`❌ ${state.errorMessage}`);
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lines.push(`\u274C ${state.errorMessage}`);
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}
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overlay.textContent = lines.join(' ');
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@@ -219,24 +234,21 @@ function renderPanelState(video, panel) {
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}
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}
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/* ======================================================================== */
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/* AggregateRenderer — global status bar */
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/* ======================================================================== */
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let statusElRef = null;
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/**
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* Aggregate playback status bar.
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* Render aggregate playback state into the top status bar.
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* Format: `2 playing | 1 buffering | 1 error | 47 seg total`
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*
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* HLS delivery is inherently segmented — fragments load one at a time into
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* the MediaSource buffer. Even when the phase is 'playing', the underlying
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* state is constantly shifting (buffer growth, quality switches, seg loads).
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* This function collapses per-panel state into a single human-readable line
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* so the user can see overall health at a glance.
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*
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* Wires up to `aggregateStateDirty` — set by `renderPanelState` whenever
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* a panel's state changes. The buffer-refresh tick checks the flag and
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* re-renders only when necessary to keep CPU usage low.
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*/
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let statusElRef = null;
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/**
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* Render aggregate playback state into the top status bar.
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* Format: `▶ 2 playing | ◷ 1 buffering | ✗ 1 error | 📦 47 seg total`
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*/
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function renderAggregateState() {
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if (!statusElRef) return;
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@@ -263,13 +275,13 @@ function renderAggregateState() {
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const totalPanels = panelStates.size;
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const parts = [];
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if (playing > 0) parts.push(`▶ ${playing} playing`);
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if (buffering > 0) parts.push(`◷ ${buffering} buffering`);
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if (errors > 0) parts.push(`✗ ${errors} error`);
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if (idle > 0) parts.push(`⏸ ${idle} idle`);
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if (playing > 0) parts.push(`\u25B6 ${playing} playing`);
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if (buffering > 0) parts.push(`\u27F7 ${buffering} buffering`);
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if (errors > 0) parts.push(`\u2717 ${errors} error`);
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if (idle > 0) parts.push(`\u23F8 ${idle} idle`);
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if (totalSegs > 0) {
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let segPart = `📦 ${totalSegs} seg`;
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let segPart = `\uD83D\uDCE6 ${totalSegs} seg`;
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if (totalSegFails > 0) segPart += ` (+${totalSegFails} fail)`;
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parts.push(segPart);
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}
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@@ -283,58 +295,28 @@ function renderAggregateState() {
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}
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const active = playing + buffering;
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if (active > 0) {
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parts.push(`💾 ${(totalBuf / active).toFixed(1)}s avg buf`);
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parts.push(`\uD83D\uDCBE ${(totalBuf / active).toFixed(1)}s avg buf`);
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}
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statusElRef.textContent = `Live grid ${totalPanels} panels: ${parts.join(' | ')} || Found ${totalPanels} video(s)`;
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}
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/* ======================================================================== */
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/* Fragmented playback tracker */
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/* EventWiring — hls.js + video element event listeners */
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/* ======================================================================== */
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/**
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* Compute buffered seconds ahead of current playback position.
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* Returns 0 if the video has no buffered ranges or is not playing.
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*/
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function getBufferedAhead(video) {
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if (!video.buffered || video.buffered.length === 0) return 0;
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const current = video.currentTime;
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// Find the buffer range that contains or is ahead of current time
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for (let i = 0; i < video.buffered.length; i++) {
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if (video.buffered.end(i) > current) {
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return video.buffered.end(i) - current;
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}
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}
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return 0;
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}
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/**
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* Attach hls.js event listeners for fragmented playback tracking.
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* This wires up every event that reveals the broken-up nature of HLS:
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* Wires up every event that reveals the broken-up nature of HLS:
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* segment loading, buffer mutations, quality switches, and decode issues.
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*
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* Side effects: registers callbacks on `hls`, creates `PanelState`,
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* sets up buffer monitor timer, patches hls.destroy for cleanup.
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*/
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function wirePlaybackTracking(hls, video, panel) {
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function wireHlsEvents(hls, video, panel) {
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const state = createPanelState();
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panelStates.set(video, state);
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// Periodically update buffer health and re-render overlay
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const bufferTimer = setInterval(() => {
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const s = panelStates.get(video);
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if (!s) { clearInterval(bufferTimer); return; }
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s.bufferedAhead = getBufferedAhead(video);
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renderPanelState(video, panel);
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// Refresh aggregate status bar if any panel changed state.
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renderAggregateState();
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}, 1000);
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// Clean up timer on destroy (monkey-patch hls.destroy)
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const origDestroy = hls.destroy.bind(hls);
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hls.destroy = function () {
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clearInterval(bufferTimer);
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origDestroy();
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};
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const HlsEvents = window.Hls.Events;
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// --- Manifest lifecycle ---
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@@ -493,15 +475,20 @@ function wirePlaybackTracking(hls, video, panel) {
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hlsInstances.delete(video);
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}
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});
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}
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// --- Video element events (complement hls.js) ---
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/**
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* Wire video element lifecycle events (playing, waiting, stalled, etc.).
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* These complement hls.js events by providing browser-level playback state.
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*/
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function wireVideoEvents(video) {
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video.addEventListener('playing', () => {
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const s = panelStates.get(video);
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if (s) {
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s.phase = 'playing';
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s.lastEvent = 'video.playing';
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s.lastActivity = Date.now();
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renderPanelState(video, panel);
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renderPanelState(video, s._panel);
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}
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});
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@@ -511,7 +498,7 @@ function wirePlaybackTracking(hls, video, panel) {
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s.phase = 'buffering';
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s.lastEvent = 'video.waiting';
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s.lastActivity = Date.now();
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renderPanelState(video, panel);
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renderPanelState(video, s._panel);
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}
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});
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@@ -521,7 +508,7 @@ function wirePlaybackTracking(hls, video, panel) {
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s.phase = 'buffering';
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s.lastEvent = 'video.stalled';
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s.lastActivity = Date.now();
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renderPanelState(video, panel);
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renderPanelState(video, s._panel);
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}
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});
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@@ -547,11 +534,69 @@ function wirePlaybackTracking(hls, video, panel) {
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if (s) {
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s.lastEvent = 'video.seeked';
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s.lastActivity = Date.now();
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renderPanelState(video, panel);
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renderPanelState(video, s._panel);
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}
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});
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}
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/* ======================================================================== */
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/* BufferMonitor — periodic buffer health check */
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/* ======================================================================== */
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/**
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* Start a periodic timer that refreshes buffer health and re-renders overlays.
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* Returns a cleanup function.
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*/
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function startBufferMonitor(video, panel) {
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const timer = setInterval(() => {
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const s = panelStates.get(video);
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if (!s) { clearInterval(timer); return; }
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s.bufferedAhead = getBufferedAhead(video);
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renderPanelState(video, panel);
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// Refresh aggregate status bar if any panel changed state.
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renderAggregateState();
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}, 1000);
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return () => clearInterval(timer);
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}
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/* ======================================================================== */
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/* HLS lifecycle helpers */
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/* ======================================================================== */
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/** Destroy the Hls instance attached to a video element (if any). */
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function destroyHls(video) {
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const inst = hlsInstances.get(video);
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||||
if (inst) {
|
||||
inst.destroy();
|
||||
hlsInstances.delete(video);
|
||||
}
|
||||
panelStates.delete(video);
|
||||
removePanelOverlay(video);
|
||||
}
|
||||
|
||||
/* ======================================================================== */
|
||||
/* PanelFactory — DOM panel creation */
|
||||
/* ======================================================================== */
|
||||
|
||||
/** Show an error message inside a panel's video placeholder. */
|
||||
function showError(panel, message) {
|
||||
const err = document.createElement('div');
|
||||
err.style.cssText = 'position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#f87171;background:rgba(0,0,0,0.6);font-family:sans-serif;font-size:13px;text-align:center;padding:12px;';
|
||||
err.textContent = message;
|
||||
panel.appendChild(err);
|
||||
}
|
||||
|
||||
/** Create a video element with standard autoplay attributes. */
|
||||
function createVideoElement() {
|
||||
const video = document.createElement('video');
|
||||
video.autoplay = true;
|
||||
video.muted = true;
|
||||
video.loop = true;
|
||||
video.playsInline = true;
|
||||
return video;
|
||||
}
|
||||
|
||||
/**
|
||||
* Play an HLS manifest on a <video> element using hls.js or native Safari.
|
||||
* Wires up fragmented playback tracking for segment/buffer/quality visibility.
|
||||
@@ -575,7 +620,21 @@ function playHls(video, manifestUrl, panel) {
|
||||
});
|
||||
|
||||
// Wire all fragmented playback tracking events
|
||||
wirePlaybackTracking(hls, video, panel);
|
||||
wireHlsEvents(hls, video, panel);
|
||||
|
||||
// Wire video element events (playing, waiting, stalled, timeupdate, etc.)
|
||||
// Store panel ref on state so video event handlers can access it.
|
||||
const state = panelStates.get(video);
|
||||
if (state) state._panel = panel;
|
||||
wireVideoEvents(video);
|
||||
|
||||
// Start periodic buffer health monitor
|
||||
const stopMonitor = startBufferMonitor(video, panel);
|
||||
const origDestroy = hls.destroy.bind(hls);
|
||||
hls.destroy = function () {
|
||||
stopMonitor();
|
||||
origDestroy();
|
||||
};
|
||||
|
||||
hls.loadSource(manifestUrl);
|
||||
hls.attachMedia(video);
|
||||
@@ -598,28 +657,6 @@ function loadHlsJs() {
|
||||
});
|
||||
}
|
||||
|
||||
/* ======================================================================== */
|
||||
/* UI helpers */
|
||||
/* ======================================================================== */
|
||||
|
||||
/** Show an error message inside a panel's video placeholder. */
|
||||
function showError(panel, message) {
|
||||
const err = document.createElement('div');
|
||||
err.style.cssText = 'position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#f87171;background:rgba(0,0,0,0.6);font-family:sans-serif;font-size:13px;text-align:center;padding:12px;';
|
||||
err.textContent = message;
|
||||
panel.appendChild(err);
|
||||
}
|
||||
|
||||
/** Create a video element with standard autoplay attributes. */
|
||||
function createVideoElement() {
|
||||
const video = document.createElement('video');
|
||||
video.autoplay = true;
|
||||
video.muted = true;
|
||||
video.loop = true;
|
||||
video.playsInline = true;
|
||||
return video;
|
||||
}
|
||||
|
||||
/**
|
||||
* Create a single panel (video or empty).
|
||||
* Returns { panel, hlsEntry } — hlsEntry is set for deferred HLS playback.
|
||||
|
||||
Reference in new issue
Block a user