view src/app/visualisations/waveform/waveform.component.ts @ 456:7bb0bac6f8dc

Add export button for recordings and option to remove audio item (also removes all related analyses atm). Revokes associated object url for audio on removal. Will be problematic if the history is used for undo / redo.

import {
  Component,
  Input,
  ChangeDetectionStrategy
} from '@angular/core';
import wavesUI from 'waves-ui-piper';
import {WavesComponent} from '../waves-base.component';


@Component({
  selector: 'ugly-waveform',
  templateUrl: '../waves-template.html',
  styleUrls: ['../waves-template.css'],
  changeDetection: ChangeDetectionStrategy.OnPush,
  providers: [
    {provide: WavesComponent, useExisting: WaveformComponent}
  ]
})
export class WaveformComponent extends WavesComponent<AudioBuffer> {
  @Input() set audioBuffer(buffer: AudioBuffer) {
    this.duration = buffer.duration;
    this.timeline.pixelsPerSecond = this.timeline.visibleWidth / buffer.duration;
    this.feature = buffer;
  }

  protected get featureLayers(): Layer[] {
    const nChannels = this.feature.numberOfChannels;
    const totalWaveHeight = this.height * 0.9;
    const waveHeight = totalWaveHeight / nChannels;

    const channelLayers: Layer[] = [];
    for (let ch = 0; ch < nChannels; ++ch) {
      channelLayers.push(new wavesUI.helpers.WaveformLayer(this.feature, {
          top: (this.height - totalWaveHeight) / 2 + waveHeight * ch,
          height: waveHeight,
          color: this.colour,
          channel: ch
        })
      );
    }
    return channelLayers;
  }
}