TM-SIGNAL-Android / app / src / main / java / org / tm / archive / audio / AudioFileInfo.java

package org.tm.archive.audio;

import androidx.annotation.NonNull;

import org.tm.archive.database.model.databaseprotos.AudioWaveFormData;

import java.util.concurrent.TimeUnit;

import okio.ByteString;

public class AudioFileInfo {
  private final long    durationUs;
  private final byte[]  waveFormBytes;
  private final float[] waveForm;

  public static @NonNull AudioFileInfo fromDatabaseProtobuf(@NonNull AudioWaveFormData audioWaveForm) {
    return new AudioFileInfo(audioWaveForm.durationUs, audioWaveForm.waveForm.toByteArray());
  }

  AudioFileInfo(long durationUs, byte[] waveFormBytes) {
    this.durationUs    = durationUs;
    this.waveFormBytes = waveFormBytes;
    this.waveForm      = new float[waveFormBytes.length];

    for (int i = 0; i < waveFormBytes.length; i++) {
      int unsigned = waveFormBytes[i] & 0xff;
      this.waveForm[i] = unsigned / 255f;
    }
  }

  public long getDuration(@NonNull TimeUnit timeUnit) {
    return timeUnit.convert(durationUs, TimeUnit.MICROSECONDS);
  }

  public float[] getWaveForm() {
    return waveForm;
  }

  public @NonNull AudioWaveFormData toDatabaseProtobuf() {
    return new AudioWaveFormData.Builder()
                                .durationUs(durationUs)
                                .waveForm(ByteString.of(waveFormBytes))
                                .build();
  }
}