whisper-transcript.js

/**
 * @license
 * Copyright 2019 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
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/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
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/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
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/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
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/**
 * @license
 * Copyright 2017 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
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/**
 * @license
 * Copyright 2018 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */const n="important",i=" !"+n,o=e(class extends i$1{constructor(t$1){if(super(t$1),t$1.type!==t.ATTRIBUTE||"style"!==t$1.name||t$1.strings?.length>2)throw Error("The `styleMap` directive must be used in the `style` attribute and must be the only part in the attribute.")}render(t){return Object.keys(t).reduce(((e,r)=>{const s=t[r];return null==s?e:e+`${r=r.includes("-")?r:r.replace(/(?:^(webkit|moz|ms|o)|)(?=[A-Z])/g,"-$&").toLowerCase()}:${s};`}),"")}update(e,[r]){const{style:s}=e.element;if(void 0===this.ft)return this.ft=new Set(Object.keys(r)),this.render(r);for(const t of this.ft)null==r[t]&&(this.ft.delete(t),t.includes("-")?s.removeProperty(t):s[t]=null);for(const t in r){const e=r[t];if(null!=e){this.ft.add(t);const r="string"==typeof e&&e.endsWith(i);t.includes("-")||r?s.setProperty(t,r?e.slice(0,-11):e,r?n:""):s[t]=e;}}return T}});

class WhisperTranscript extends r {
  static styles = i$5`
    :host {
      display: block;
      padding: 25px;
      color: var(--whisper-transcript-text-color, #000);
    }

    ul {
      list-style: none;
      padding-left: 0;
      overflow-y: auto;
    }

    .media {
      text-align: center;
      position: sticky;
      top: 0;
    }

    .whisper-transcript {
      background: black;
      color: white;
    }
  `;

  static properties = {
    url: {type: String},
    audio: {type: String},
    video: {type: String},
    transcript: {type: Object, attribute: false},
    time: {type: Number},
    maxHeight: {type: String}
  };

  constructor() {
    super();
    this.time = 0;
  }

  connectedCallback() {
    super.connectedCallback();
    this.getTranscript();

    window.addEventListener('update-time', (e) => this.updateTime(e.detail.time));
  }

  async getTranscript() {
    const resp = await fetch(this.url);
    this.transcript = await resp.json();
  }

  updateTime(currentTime) {
    this.time = currentTime;
    this.requestUpdate();
    this.scrollToActiveSegment();
  }

  scrollToActiveSegment() {
    const activeSegment = this.shadowRoot.querySelector('.active');
    if (activeSegment) {
      activeSegment.scrollIntoView({ behavior: 'smooth', block: 'center' });
    }
  }

  render() {
    const styles = {
      maxHeight: this.maxHeight
    };

    if (! this.transcript) {
      return x`Loading...`;
    }

    const media = this.audio
      ? x`<whisper-media audio="${this.audio}"></whisper-media>`
      : x`<whisper-media video="${this.video}"></whisper-media>`;

    return x`
      <div class="whisper-transcript">
        <div class="media">${media}</div>
        <ul style="${o(styles)}">
          ${this.transcript.segments.map(
            (s) => x`
              <whisper-segment class="${this.time >= s.start && this.time <= s.end ? 'active' : ''}" .words="${s.words}"
                 start="${s.start}" end="${s.end}" text="${s.text}" />
            `
          )}
        </ul>
      </div>
    `;
  }
}

class WhisperSegment extends r {
  static properties = {
    text: { type: String },
    start: { type: Number },
    end: { type: Number },
    words: { type: Array },
    selected: { type: Boolean }
  };

  static styles = i$5`
    .segment {
      border: 2px solid #333;
      padding: 5px;
      margin: 2px;
      border-radius: 5px;
      display: flex;
      flex-direction: row;
    }

    .selected {
      background-color: #555;
      border-color: black;
    }

    .times {
      width: 325px;
      float: left;
      color: lightgray;
      margin-right: 10px;
    }

    .words {
      width: 100%;
    }
  `

  constructor() {
    super();

    this.selected = false;

    const that = this;
    window.addEventListener('update-time', e => that.updateTime(e.detail.time));
  }

  updateTime(time) {
    if ((time >= this.start) && (time <= this.end)) {
      this.selected = true;
    } else {
      this.selected = false;
    }
  }

  render() {
    if (this.words) {
      return x`
        <li class="${this.selected ? 'selected' : ''} segment">
          <div class="times">${hms(this.start)} - ${hms(this.end)}</div>
          <div class="words">
          ${this.words.map(w =>
            x`<whisper-word title="${w.probability}" word="${w.word}" start="${w.start}" end="${w.end}" probability="${w.probability}" />`
          )}
          </div>
        </li>
      `;
    }
  }
}

function hms(secs) {
  const h = Math.trunc(secs / 60 / 60);
  const m = Math.trunc((secs - (h * 60)) / 60);
  const s = Math.trunc(secs) - (h * 60 + m * 60);

  return `${pad(h)}:${pad(m)}:${pad(s)}`;
}

function pad(i) {
  return String(i).padStart(2, '0');
}

class WhisperWord extends r {

  static properties = {
    word: {type: String},
    probability: {type: Number},
    start: {type: Number},
    end: {type: Number},
    selected: {type: Boolean}
  }

  static styles = i$5`
    span.word {
      cursor: pointer;
    }

    span.selected {
      text-decoration: underline;
    }

    span.mediocre {
      color: yellow;
    }

    span.poor {
      color: orange;
    }

    span.terrible {
      color: red;
    }
  `;

  constructor() {
    super();

    this.addEventListener('click', _ => this.updatePlayerTime());
  }

  connectedCallback() {
    super.connectedCallback();

    const that = this;
    window.addEventListener('update-time', e => that.updateTime(e.detail.time));
  }

  updatePlayerTime() {
    window.dispatchEvent(
      new CustomEvent("update-player-time", {
        detail: {
          time: this.start
        }
      })
    );
  }

  updateTime(time) {
    if ((time >= this.start) && (time <= this.end)) {
      this.selected = true;
    } else {
      this.selected = false;
    }
  }

  getCssClass() {
    let style = this.selected ? 'selected ' : '';
    if (this.probability > .9) {
      style += 'good';
    } else if (this.probability > .7) {
      style += 'mediocre';
    } else if (this.probability > .5) {
      style += 'poor';
    } else {
      style += 'terrible';
    }

    return style;
  }

  render() {
    return x`
      <span
        data-start="${this.start}"
        data-end="${this.end}"
        class="word ${this.getCssClass()}">
        ${this.word}
      </span>
    `
  }
}

class WhisperMedia extends r {
  static styles = i$5`
    audio {
      width: 100%;
    }

    video {
      max-height: 200px;
      margin-left: auto;
      margin-right: auto;
    }
  `;

  static properties = {
    audio: {type: String},
    video: {type: String}
  };

  updateTime(time) {
    window.dispatchEvent(
      new CustomEvent("update-time", {
        detail: {
          time
        }
      })
    );
  }

  render() {
    let media = null;
    if (this.audio) {
      media = document.createElement('audio', this.audio);
      media.src = this.audio;
    } else {
      media = document.createElement('video', this.video);
      media.src = this.video;
    }

    if (media) {
      media.controls = true;
      media.preload = "auto";
      media.ontimeupdate = (_) => this.updateTime(media.currentTime);
      window.addEventListener('update-player-time', e => media.currentTime = e.detail.time);

      return x`${media}`;
    }
  }
}

window.customElements.define('whisper-transcript', WhisperTranscript);
window.customElements.define('whisper-segment', WhisperSegment);
window.customElements.define('whisper-word', WhisperWord);
window.customElements.define('whisper-media', WhisperMedia);

export { WhisperMedia, WhisperSegment, WhisperTranscript, WhisperWord };
//# sourceMappingURL=index.js.map