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Fix: streamed tracks play with no sound (suspended Web Audio context)

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The visualizer calls createMediaElementSource(audioPlayer), which permanently
reroutes the shared <audio> element's output through npAudioContext. That
context is created from an async play().then() callback (outside the user
gesture), so browsers start it 'suspended' under the autoplay policy — and the
only resume() lived in the visualizer loop, which runs when the Now Playing
modal opens, NOT on play. Result: the element advances (looks like it's
playing) but its audio drains into a suspended context = no sound, everywhere.

Add npEnsureAudioContextRunning() and call it on every play start
(setPlayingState(true)) plus right after the context is created in
npInitVisualizer. Resuming an already-running/absent context is a safe no-op.
This commit is contained in:
BoulderBadgeDad 2026-06-04 14:29:13 -07:00
parent ceb9ee15fc
commit 5cb65ab00e
1 changed files with 21 additions and 0 deletions
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21
webui/static/media-player.js
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@ -304,6 +304,10 @@ function setPlayingState(playing) {
// Sidebar audio visualizer
if (playing) {
npInitVisualizer();
// npInitVisualizer only runs its setup once; the element stays routed
// through npAudioContext, so resume it on EVERY play start or playback
// is silent when the context has been suspended (autoplay / tab blur).
npEnsureAudioContextRunning();
startSidebarVisualizer();
} else {
stopSidebarVisualizer();
@ -2661,6 +2665,20 @@ function getNpAlbumArtUrl() {
// WEB AUDIO VISUALIZER
// ===============================
// Once createMediaElementSource() captures the <audio> element, ALL of its
// output is routed through this AudioContext — so if the context is suspended
// (browsers create it suspended under the autoplay policy, and we init it from
// an async play().then callback that's outside the gesture), the track plays
// but no sound reaches the speakers. Resuming must happen on every play start,
// not only when the visualizer loop runs. Safe to call anytime.
function npEnsureAudioContextRunning() {
try {
if (npAudioContext && npAudioContext.state === 'suspended') {
npAudioContext.resume().catch(() => {});
}
} catch (_) { /* no-op */ }
}
function npInitVisualizer() {
if (npVizInitialized || !audioPlayer) return;
try {
@ -2676,6 +2694,9 @@ function npInitVisualizer() {
npAnalyser.connect(npAudioContext.destination);
}
npVizInitialized = true;
// Freshly created contexts start suspended — resume so the rerouted
// element is actually audible (this is the no-sound-on-play bug).
npEnsureAudioContextRunning();
} catch (e) {
console.warn('Web Audio visualizer init failed, using CSS fallback:', e.message);
// Mark as CSS fallback