后端传来是 base64-encoded 的 mp3 音频的字符串，码率、声道这些信息（ sampleRate 、numChannels 、bitsPerSample 、dataLength ）不知道，直接放在<audio>中播放是正常的：

<audio controls>  <source src="data:audio/mpeg;base64, base64-encoded-string"  type="audio/mpeg"></audio>  

重新解码作为 blob 播放，放出来就很多杂音，这中情况是哪里的问题？

<script type="text/javascript">    const audioContext = new (window.AudioContext || window.webkitAudioContext)();    const decoder = new TextDecoder("utf-8");    function base64ToArrayBuffer(base64) {        const binary = atob(base64);        const len = binary.length;        const bytes = new Uint8Array(len);        for (let i = 0; i < len; i++) {            bytes[i] = binary.charCodeAt(i);        }        return bytes.buffer;    }    function playAudioChunk(base64) {        const arrayBuffer = base64ToArrayBuffer(base64);        audioContext.decodeAudioData(arrayBuffer).then((audioBuffer) => {            const source = audioContext.createBufferSource();            source.buffer = audioBuffer;            source.connect(audioContext.destination);            source.start(0);        }).catch((err) => {            console.error("Error decoding audio data", err);        });    }    // ws-connection ...    playAudioChunk(base64-encoded-string);      </script>