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Podcast player: calmer line-following scroll, and a voice you can pick

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"The scrolling works kinda weirdly" + "maybe a less robotic voice, preferably
male".

Scroll: the transcript now follows by LINE, not by word - words on the same
line never move the page (that was the jitter), a line only scrolls once it
leaves a comfortable band, small corrections are instant rather than animated,
and a wheel/touch/drag on the transcript pauses the following for four seconds
instead of fighting the reader. Chapter jumps and word taps re-centre at once.

Voice: lib/podcast-voices ranks what the platform installed (natural / neural
/ online names up, espeak / SAM / compact down, a male name preferred) and the
player picks the best one automatically; a new picker in the chrome lists
everything in the episode's language, applies it live and remembers the choice
per language. A note points at the system settings when only robotic voices
exist. The engine takes the chosen voice instead of guessing.

podcast-test: 34 checks now (voice ranking, filtered picker, persisted pick,
same-line silence, line following, manual-scroll suspension). Version 0.7.4,
SW v96.
This commit is contained in:
Martin Dvořák 2026-10-16 13:05:57 +00:00
commit 4ec986da12
8 changed files with 684 additions and 46 deletions
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7
lib/podcast-speech.ts
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@ -16,7 +16,7 @@
* "jump to a chapter" and "resume where you left off" the same operation.
*/
import { pickVoice, speechAvailable } from "./speech";
import { speechAvailable } from "./speech";
import type { PodcastSection } from "./schemas";
export type PodcastVoice = { section: number; word: number };
@ -25,6 +25,8 @@ export type PodcastSpeechEvents = {
sections: PodcastSection[];
locale: string;
rate: number;
/** The chosen voice (lib/podcast-voices); null lets the platform decide. */
voice?: SpeechSynthesisVoice | null;
/** Global word position changed (word = index inside its section). */
onWord: (position: PodcastVoice) => void;
/** Playback actually began (after the engine accepted it). */
@ -134,8 +136,7 @@ export function createPodcastSpeech(events: PodcastSpeechEvents): PodcastSpeech
const utterance = new SpeechSynthesisUtterance(text);
utterance.lang = events.locale;
utterance.rate = events.rate;
const voice = pickVoice(events.locale);
if (voice) utterance.voice = voice;
if (events.voice) utterance.voice = events.voice;
const offsetFor = (charIndex: number) => {
/* First token whose span ends after the reported character. */