Como construir un reproductor de audio con Claude Code

Construir un reproductor de audio con Claude Code

Hay muchas situaciones donde se necesita un reproductor de audio personalizado: servicios de streaming de musica, podcasts, contenido educativo, etc. Con Claude Code puedes construir un reproductor completo con visualizacion de forma de onda y funcionalidad de lista de reproduccion.

Implementacion del reproductor basico

> Crea un reproductor de audio personalizado.
> Compatible con reproduccion/pausa, barra de avance, volumen y cambio de velocidad de reproduccion.
> Implementa tambien la funcionalidad de lista de reproduccion y visualizacion de forma de onda.

// src/components/AudioPlayer.tsx
'use client';
import { useRef, useState, useEffect } from 'react';

interface Track {
  id: string;
  title: string;
  artist: string;
  src: string;
  duration: number;
  coverArt?: string;
}

interface AudioPlayerProps {
  tracks: Track[];
  initialTrackIndex?: number;
}

export function AudioPlayer({ tracks, initialTrackIndex = 0 }: AudioPlayerProps) {
  const audioRef = useRef<HTMLAudioElement>(null);
  const [currentTrackIndex, setCurrentTrackIndex] = useState(initialTrackIndex);
  const [isPlaying, setIsPlaying] = useState(false);
  const [currentTime, setCurrentTime] = useState(0);
  const [duration, setDuration] = useState(0);
  const [volume, setVolume] = useState(0.8);

  const currentTrack = tracks[currentTrackIndex];

  useEffect(() => {
    const audio = audioRef.current;
    if (!audio) return;

    const onTimeUpdate = () => setCurrentTime(audio.currentTime);
    const onLoadedMetadata = () => setDuration(audio.duration);
    const onEnded = () => playNext();

    audio.addEventListener('timeupdate', onTimeUpdate);
    audio.addEventListener('loadedmetadata', onLoadedMetadata);
    audio.addEventListener('ended', onEnded);

    return () => {
      audio.removeEventListener('timeupdate', onTimeUpdate);
      audio.removeEventListener('loadedmetadata', onLoadedMetadata);
      audio.removeEventListener('ended', onEnded);
    };
  }, [currentTrackIndex]);

  const togglePlay = () => {
    const audio = audioRef.current;
    if (!audio) return;
    if (audio.paused) {
      audio.play();
      setIsPlaying(true);
    } else {
      audio.pause();
      setIsPlaying(false);
    }
  };

  const playNext = () => {
    const nextIndex = (currentTrackIndex + 1) % tracks.length;
    setCurrentTrackIndex(nextIndex);
    setTimeout(() => {
      audioRef.current?.play();
      setIsPlaying(true);
    }, 100);
  };

  const playPrevious = () => {
    if (currentTime > 3) {
      // Si han pasado mas de 3 segundos, volver al inicio
      audioRef.current!.currentTime = 0;
    } else {
      const prevIndex = (currentTrackIndex - 1 + tracks.length) % tracks.length;
      setCurrentTrackIndex(prevIndex);
      setTimeout(() => {
        audioRef.current?.play();
        setIsPlaying(true);
      }, 100);
    }
  };

  const formatTime = (sec: number) => {
    const m = Math.floor(sec / 60);
    const s = Math.floor(sec % 60);
    return `${m}:${s.toString().padStart(2, '0')}`;
  };

  return (
    <div className="bg-white dark:bg-gray-800 rounded-2xl shadow-lg overflow-hidden max-w-md mx-auto">
      <audio ref={audioRef} src={currentTrack.src} preload="metadata" />

      {/* Caratula */}
      <div className="aspect-square bg-gray-200 dark:bg-gray-700 relative">
        {currentTrack.coverArt ? (
          <img src={currentTrack.coverArt} alt={currentTrack.title} className="w-full h-full object-cover" />
        ) : (
          <div className="w-full h-full flex items-center justify-center text-6xl text-gray-400">&#9835;</div>
        )}
      </div>

      {/* Informacion de la pista */}
      <div className="p-6">
        <h3 className="text-lg font-bold dark:text-white truncate">{currentTrack.title}</h3>
        <p className="text-gray-500 dark:text-gray-400 text-sm">{currentTrack.artist}</p>

        {/* Barra de avance */}
        <div className="mt-4">
          <input
            type="range"
            min={0}
            max={duration || 0}
            value={currentTime}
            onChange={(e) => {
              const time = Number(e.target.value);
              audioRef.current!.currentTime = time;
              setCurrentTime(time);
            }}
            className="w-full h-1 accent-blue-600"
          />
          <div className="flex justify-between text-xs text-gray-400 mt-1">
            <span>{formatTime(currentTime)}</span>
            <span>{formatTime(duration)}</span>
          </div>
        </div>

        {/* Controles */}
        <div className="flex items-center justify-center gap-6 mt-4">
          <button onClick={playPrevious} className="text-2xl dark:text-white hover:text-blue-600">&#9198;</button>
          <button
            onClick={togglePlay}
            className="w-14 h-14 rounded-full bg-blue-600 text-white text-2xl flex items-center justify-center hover:bg-blue-700"
          >
            {isPlaying ? '&#9208;' : '&#9654;'}
          </button>
          <button onClick={playNext} className="text-2xl dark:text-white hover:text-blue-600">&#9197;</button>
        </div>

        {/* Volumen */}
        <div className="flex items-center gap-2 mt-4">
          <span className="text-sm dark:text-gray-400">&#128266;</span>
          <input
            type="range"
            min={0}
            max={1}
            step={0.05}
            value={volume}
            onChange={(e) => {
              const vol = Number(e.target.value);
              audioRef.current!.volume = vol;
              setVolume(vol);
            }}
            className="flex-1 h-1 accent-blue-600"
          />
        </div>
      </div>

      {/* Lista de reproduccion */}
      <div className="border-t dark:border-gray-700 max-h-60 overflow-y-auto">
        {tracks.map((track, index) => (
          <button
            key={track.id}
            onClick={() => {
              setCurrentTrackIndex(index);
              setTimeout(() => { audioRef.current?.play(); setIsPlaying(true); }, 100);
            }}
            className={`w-full flex items-center gap-3 p-3 text-left hover:bg-gray-50 dark:hover:bg-gray-700 ${
              index === currentTrackIndex ? 'bg-blue-50 dark:bg-blue-900/30' : ''
            }`}
          >
            <span className="text-xs text-gray-400 w-6 text-right">
              {index === currentTrackIndex && isPlaying ? '&#9835;' : index + 1}
            </span>
            <div className="flex-1 min-w-0">
              <p className="text-sm font-medium dark:text-white truncate">{track.title}</p>
              <p className="text-xs text-gray-500 truncate">{track.artist}</p>
            </div>
            <span className="text-xs text-gray-400">{formatTime(track.duration)}</span>
          </button>
        ))}
      </div>
    </div>
  );
}

Visualizacion de forma de onda con Web Audio API

Como funcionalidad avanzada, tambien puedes solicitar a Claude Code la visualizacion en tiempo real de la forma de onda usando Web Audio API. Combinando AudioContext y AnalyserNode, puedes dibujar la forma de onda del audio en reproduccion sobre un Canvas.

Articulos relacionados

Para la implementacion de un reproductor de video, consulta la guia de construccion de reproductor de video; para diseno responsive, consulta diseno responsive.

Para mas detalles sobre Web Audio API, consulta MDN (developer.mozilla.org/Web/API/Web_Audio_API).