add initial files

src/renderer/components/audio-player/AudioPlayer.tsx

@@ -0,0 +1,184 @@
+import {
+  useImperativeHandle,
+  forwardRef,
+  useRef,
+  useState,
+  useCallback,
+} from 'react';
+import ReactPlayer, { ReactPlayerProps } from 'react-player';
+import {
+  CrossfadeStyle,
+  PlaybackStyle,
+  PlayerStatus,
+  Song,
+} from '../../../types';
+import { crossfadeHandler, gaplessHandler } from './utils/listenHandlers';
+
+interface AudioPlayerProps extends ReactPlayerProps {
+  crossfadeDuration: number;
+  crossfadeStyle: CrossfadeStyle;
+  currentPlayer: 1 | 2;
+  player1: Song;
+  player2: Song;
+  status: PlayerStatus;
+  style: PlaybackStyle;
+  volume: number;
+}
+
+export type AudioPlayerProgress = {
+  loaded: number;
+  loadedSeconds: number;
+  played: number;
+  playedSeconds: number;
+};
+
+const getDuration = (ref: any) => {
+  return ref.current?.player?.player?.player?.duration;
+};
+
+export const AudioPlayer = forwardRef(
+  (
+    {
+      status,
+      style,
+      crossfadeStyle,
+      crossfadeDuration,
+      currentPlayer,
+      autoNext,
+      player1,
+      player2,
+      muted,
+      volume,
+    }: AudioPlayerProps,
+    ref: any
+  ) => {
+    const player1Ref = useRef<any>(null);
+    const player2Ref = useRef<any>(null);
+    const [isTransitioning, setIsTransitioning] = useState(false);
+
+    useImperativeHandle(ref, () => ({
+      get player1() {
+        return player1Ref?.current;
+      },
+      get player2() {
+        return player2Ref?.current;
+      },
+    }));
+
+    const handleOnEnded = () => {
+      autoNext();
+      setIsTransitioning(false);
+    };
+
+    const handleCrossfade1 = useCallback(
+      (e: AudioPlayerProgress) => {
+        return crossfadeHandler({
+          currentPlayer,
+          currentPlayerRef: player1Ref,
+          currentTime: e.playedSeconds,
+          duration: getDuration(player1Ref),
+          fadeDuration: crossfadeDuration,
+          fadeType: crossfadeStyle,
+          isTransitioning,
+          nextPlayerRef: player2Ref,
+          player: 1,
+          setIsTransitioning,
+          volume,
+        });
+      },
+      [
+        crossfadeDuration,
+        crossfadeStyle,
+        currentPlayer,
+        isTransitioning,
+        volume,
+      ]
+    );
+
+    const handleCrossfade2 = useCallback(
+      (e: AudioPlayerProgress) => {
+        return crossfadeHandler({
+          currentPlayer,
+          currentPlayerRef: player2Ref,
+          currentTime: e.playedSeconds,
+          duration: getDuration(player2Ref),
+          fadeDuration: crossfadeDuration,
+          fadeType: crossfadeStyle,
+          isTransitioning,
+          nextPlayerRef: player1Ref,
+          player: 2,
+          setIsTransitioning,
+          volume,
+        });
+      },
+      [
+        crossfadeDuration,
+        crossfadeStyle,
+        currentPlayer,
+        isTransitioning,
+        volume,
+      ]
+    );
+
+    const handleGapless1 = useCallback(
+      (e: AudioPlayerProgress) => {
+        return gaplessHandler({
+          currentTime: e.playedSeconds,
+          duration: getDuration(player1Ref),
+          isFlac: player1?.suffix === 'flac',
+          isTransitioning,
+          nextPlayerRef: player2Ref,
+          setIsTransitioning,
+        });
+      },
+      [isTransitioning, player1?.suffix]
+    );
+
+    const handleGapless2 = useCallback(
+      (e: AudioPlayerProgress) => {
+        return gaplessHandler({
+          currentTime: e.playedSeconds,
+          duration: getDuration(player2Ref),
+          isFlac: player2?.suffix === 'flac',
+          isTransitioning,
+          nextPlayerRef: player1Ref,
+          setIsTransitioning,
+        });
+      },
+      [isTransitioning, player2?.suffix]
+    );
+
+    return (
+      <>
+        <ReactPlayer
+          ref={player1Ref}
+          height={0}
+          muted={muted}
+          playing={currentPlayer === 1 && status === PlayerStatus.Playing}
+          progressInterval={isTransitioning ? 10 : 250}
+          url={player1?.streamUrl}
+          volume={volume}
+          width={0}
+          onEnded={handleOnEnded}
+          onProgress={
+            style === PlaybackStyle.Gapless ? handleGapless1 : handleCrossfade1
+          }
+        />
+        <ReactPlayer
+          ref={player2Ref}
+          height={0}
+          muted={muted}
+          playing={currentPlayer === 2 && status === PlayerStatus.Playing}
+          progressInterval={isTransitioning ? 10 : 250}
+          url={player2?.streamUrl}
+          volume={volume}
+          width={0}
+          onEnded={handleOnEnded}
+          onProgress={
+            style === PlaybackStyle.Gapless ? handleGapless2 : handleCrossfade2
+          }
+        />
+      </>
+    );
+  }
+);

src/renderer/components/audio-player/utils/listenHandlers.ts

@@ -0,0 +1,147 @@
+/* eslint-disable no-nested-ternary */
+import { Dispatch } from 'react';
+import { CrossfadeStyle } from '../../../../types';
+
+export const gaplessHandler = (args: {
+  currentTime: number;
+  duration: number;
+  isFlac: boolean;
+  isTransitioning: boolean;
+  nextPlayerRef: any;
+  setIsTransitioning: Dispatch<boolean>;
+}) => {
+  const {
+    nextPlayerRef,
+    currentTime,
+    duration,
+    isTransitioning,
+    setIsTransitioning,
+    isFlac,
+  } = args;
+
+  if (!isTransitioning) {
+    if (currentTime > duration - 2) {
+      return setIsTransitioning(true);
+    }
+
+    return null;
+  }
+
+  const durationPadding = isFlac ? 0.065 : 0.116;
+  if (currentTime + durationPadding >= duration) {
+    return nextPlayerRef.current.getInternalPlayer().play();
+  }
+
+  return null;
+};
+
+export const crossfadeHandler = (args: {
+  currentPlayer: 1 | 2;
+  currentPlayerRef: any;
+  currentTime: number;
+  duration: number;
+  fadeDuration: number;
+  fadeType: CrossfadeStyle;
+  isTransitioning: boolean;
+  nextPlayerRef: any;
+  player: 1 | 2;
+  setIsTransitioning: Dispatch<boolean>;
+  volume: number;
+}) => {
+  const {
+    currentTime,
+    player,
+    currentPlayer,
+    currentPlayerRef,
+    nextPlayerRef,
+    fadeDuration,
+    fadeType,
+    duration,
+    volume,
+    isTransitioning,
+    setIsTransitioning,
+  } = args;
+
+  if (!isTransitioning || currentPlayer !== player) {
+    const shouldBeginTransition = currentTime >= duration - fadeDuration;
+
+    if (shouldBeginTransition) {
+      setIsTransitioning(true);
+      return nextPlayerRef.current.getInternalPlayer().play();
+    }
+    return null;
+  }
+
+  const timeLeft = duration - currentTime;
+  let currentPlayerVolumeCalculation;
+  let nextPlayerVolumeCalculation;
+  let percentageOfFadeLeft;
+  let n;
+  switch (fadeType) {
+    case 'equalPower':
+      // https://dsp.stackexchange.com/a/14755
+      percentageOfFadeLeft = (timeLeft / fadeDuration) * 2;
+      currentPlayerVolumeCalculation =
+        Math.sqrt(0.5 * percentageOfFadeLeft) * volume;
+      nextPlayerVolumeCalculation =
+        Math.sqrt(0.5 * (2 - percentageOfFadeLeft)) * volume;
+      break;
+    case 'linear':
+      currentPlayerVolumeCalculation = (timeLeft / fadeDuration) * volume;
+      nextPlayerVolumeCalculation =
+        ((fadeDuration - timeLeft) / fadeDuration) * volume;
+      break;
+    case 'dipped':
+      // https://math.stackexchange.com/a/4622
+      percentageOfFadeLeft = timeLeft / fadeDuration;
+      currentPlayerVolumeCalculation = percentageOfFadeLeft ** 2 * volume;
+      nextPlayerVolumeCalculation = (percentageOfFadeLeft - 1) ** 2 * volume;
+      break;
+    case fadeType.match(/constantPower.*/)?.input:
+      // https://math.stackexchange.com/a/26159
+      n =
+        fadeType === 'constantPower'
+          ? 0
+          : fadeType === 'constantPowerSlowFade'
+          ? 1
+          : fadeType === 'constantPowerSlowCut'
+          ? 3
+          : 10;
+
+      percentageOfFadeLeft = timeLeft / fadeDuration;
+      currentPlayerVolumeCalculation =
+        Math.cos(
+          (Math.PI / 4) * ((2 * percentageOfFadeLeft - 1) ** (2 * n + 1) - 1)
+        ) * volume;
+      nextPlayerVolumeCalculation =
+        Math.cos(
+          (Math.PI / 4) * ((2 * percentageOfFadeLeft - 1) ** (2 * n + 1) + 1)
+        ) * volume;
+      break;
+
+    default:
+      currentPlayerVolumeCalculation = (timeLeft / fadeDuration) * volume;
+      nextPlayerVolumeCalculation =
+        ((fadeDuration - timeLeft) / fadeDuration) * volume;
+      break;
+  }
+
+  const currentPlayerVolume =
+    currentPlayerVolumeCalculation >= 0 ? currentPlayerVolumeCalculation : 0;
+
+  const nextPlayerVolume =
+    nextPlayerVolumeCalculation <= volume
+      ? nextPlayerVolumeCalculation
+      : volume;
+
+  if (currentPlayer === 1) {
+    currentPlayerRef.current.getInternalPlayer().volume = currentPlayerVolume;
+    nextPlayerRef.current.getInternalPlayer().volume = nextPlayerVolume;
+  } else {
+    currentPlayerRef.current.getInternalPlayer().volume = currentPlayerVolume;
+    nextPlayerRef.current.getInternalPlayer().volume = nextPlayerVolume;
+  }
+  // }
+
+  return null;
+};