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annotate react_games/src/API_works/music_player.tsx @ 71:75de5903355c

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Giagantic changes that update Dowa library to be more align with stb style array and hashmap. Updated Seobeo to be caching on server side instead of file level caching. Deleted bunch of things I don't really use.
author June Park <parkjune1995@gmail.com>
date Sun, 28 Dec 2025 20:34:22 -0800
parents fb9bcd3145cb
children
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1 import { useCallback, useEffect, useRef, useState } from "react";
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2
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3 const CHAPTERS: string[] = [
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4 "https://www.soundhelix.com/examples/mp3/SoundHelix-Song-1.mp3",
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5 "https://www.learningcontainer.com/wp-content/uploads/2020/02/Kalimba.mp3",
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6 "https://download.samplelib.com/mp3/sample-3s.mp3",
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7 ];
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8
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9 type AudioComponentProp = {
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10 srcUrl: string;
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11 onNext?: () => void;
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12 onPrev?: () => void;
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13 };
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14
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15 function fmt(t: number) {
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16 if (!isFinite(t)) return "0:00";
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17 const m = Math.floor(t / 60);
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18 const s = Math.floor(t % 60);
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19 return `${m}:${s.toString().padStart(2, "0")}`;
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20 }
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21
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22 const AudioComponent = ({ srcUrl, onNext, onPrev }: AudioComponentProp) => {
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23 const audioRef = useRef<HTMLAudioElement>(null);
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24
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25 const [isPlaying, setIsPlaying] = useState(false);
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26 const [current, setCurrent] = useState(0);
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27 const [duration, setDuration] = useState(0);
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28
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29 // If true, auto-play after src changes and can play.
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30 const autoplayNextRef = useRef(false);
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31
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32 // Wire up element events once.
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33 useEffect(() => {
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34 const el = audioRef.current;
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35 if (!el) return;
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36
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37 const onPlay = () => setIsPlaying(true);
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38 const onPause = () => setIsPlaying(false);
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39 const onTime = () => setCurrent(el.currentTime || 0);
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40 const onMeta = () => setDuration(isFinite(el.duration) ? el.duration : 0);
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41 const onEnded = () => {
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42 if (!onNext) return;
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43 autoplayNextRef.current = true; // keep playing the next track
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44 onNext();
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45 };
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46
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47 el.addEventListener("play", onPlay);
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48 el.addEventListener("pause", onPause);
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49 el.addEventListener("timeupdate", onTime);
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50 el.addEventListener("loadedmetadata", onMeta);
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51 el.addEventListener("ended", onEnded);
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52
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53 // Prime initial state
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54 onMeta();
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55 onTime();
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56 setIsPlaying(!el.paused && !el.ended);
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57
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58 return () => {
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59 el.removeEventListener("play", onPlay);
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60 el.removeEventListener("pause", onPause);
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61 el.removeEventListener("timeupdate", onTime);
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62 el.removeEventListener("loadedmetadata", onMeta);
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63 el.removeEventListener("ended", onEnded);
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64 };
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65 }, [onNext]);
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66
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67 // When src changes, load and maybe auto-play when ready.
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68 useEffect(() => {
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69 const el = audioRef.current;
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70 if (!el) return;
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71
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72 el.load(); // pick up new src
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73
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74 const tryPlay = () => {
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75 if (autoplayNextRef.current) {
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76 autoplayNextRef.current = false;
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77 el.play().catch(() => {
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78 // Autoplay might be blocked; leave paused state as-is.
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79 });
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80 }
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81 };
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82
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83 // Play once ready (covers both cached and freshly loaded cases)
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84 el.addEventListener("canplay", tryPlay, { once: true });
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85 // In case it's already buffered:
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86 tryPlay();
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87
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88 // Reset progress immediately on new track
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89 setCurrent(0);
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90 }, [srcUrl]);
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91
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92 const toggle = useCallback(() => {
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93 const el = audioRef.current;
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94 if (!el) return;
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95 if (el.paused) el.play().catch(() => {});
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96 else el.pause();
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97 }, []);
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98
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99 const seek = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {
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100 const el = audioRef.current;
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101 if (!el) return;
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102 el.currentTime = Number(e.target.value);
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103 }, []);
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104
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105 // Button handlers: set the autoplay flag so next track starts immediately.
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106 const handleNext = useCallback(() => {
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107 if (!onNext) return;
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108 autoplayNextRef.current = true; // user gesture → autoplay allowed
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109 onNext();
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110 }, [onNext]);
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111
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112 const handlePrev = useCallback(() => {
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113 if (!onPrev) return;
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114 autoplayNextRef.current = true;
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115 onPrev();
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116 }, [onPrev]);
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117
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118 const pct = duration > 0 ? (current / duration) * 100 : 0;
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119
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120 return (
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121 <>
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122 {/* remove "controls" if you want only custom UI */}
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123 <audio ref={audioRef} src={srcUrl} preload="metadata" />
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124 <div style={{ display: "flex", gap: 8, alignItems: "center", margin: "8px 0" }}>
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125 <button onClick={toggle}>{isPlaying ? "Pause" : "Play"}</button>
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126 <button onClick={handlePrev} disabled={!onPrev}>Prev</button>
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127 <button onClick={handleNext} disabled={!onNext}>Next</button>
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128 " <span style={{ marginLeft: 8, width: 56, textAlign: "right" }}>{fmt(current)}</span>",
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129 <input
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130 type="range"
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131 min={0}
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132 max={duration || 0}
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133 step={0.01}
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134 value={current}
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135 onChange={seek}
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136 style={{ flex: 1 }}
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137 />
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138 <span style={{ width: 56 }}>{fmt(duration)}</span>
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139 </div>
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140 {/* Optional thin progress bar */}
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141 <div style={{ height: 4, width: "100%", background: "#eee", borderRadius: 2 }}>
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142 <div style={{ height: "100%", width: `${pct}%`, background: "#999", borderRadius: 2 }} />
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143 </div>
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144 </>
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145 );
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146 };
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147
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148 const MusicPlayer = () => {
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149 const [musicIndex, setMusicIndex] = useState<number>(0);
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150
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151 const onNext = useCallback(
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152 () => setMusicIndex((i) => Math.min(i + 1, CHAPTERS.length - 1)),
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153 []
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154 );
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155 const onPrev = useCallback(() => setMusicIndex((i) => Math.max(i - 1, 0)), []);
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156
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157 return (
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158 <AudioComponent
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159 srcUrl={CHAPTERS[musicIndex]}
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160 onNext={musicIndex === CHAPTERS.length - 1 ? undefined : onNext}
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161 onPrev={musicIndex === 0 ? undefined : onPrev}
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162 />
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163 );
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164 };
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165
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166 export {
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167 MusicPlayer,
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168 }