如何在Unity中转换base64mpeg到AudioClip ?

Question

经过一番研究，我得到了以下内容

private float[] Normalize(float[] data)  {
float max = float.MinValue;
for (int i = 0; i < data.Length; i++){
if (System.Math.Abs(data[i]) > max) max = System.Math.Abs(data[i]);
}
for (int i = 0; i < data.Length; i++) data[i] = data[i] / max;
return data;
}
private float[] ConvertByteToFloat(byte[] array){
float[] floatArr = new float[array.Length / 4];
for (int i = 0; i < floatArr.Length; i++){
if (System.BitConverter.IsLittleEndian)  System.Array.Reverse(array, i * 4, 4);
floatArr[i] = System.BitConverter.ToSingle(array, i * 4) ;
}
return Normalize(floatArr);
}
byte[] bytes = System.Convert.FromBase64String(data);
float[] f = ConvertByteToFloat(bytes);
qa[i] = AudioClip.Create("qjAudio", f.Length, 2, 44100, false);
qa[i].SetData(f,0);

然而，我听到的只是一些随机的噪音。

我怎样才能正确地转换一个base64 mp3字符串到AudioClip?

Answer 1

我做了一些研究，并提出UnityWebRequestMultimedia。GetAudioClip是很好的方法。

1. 将base64字符串转换为字节数组var audioBytes = Convert.FromBase64String(base64EncodedMp3String);
2. 创建临时路径来存储它作为参考var tempPath = Application.persistentDataPath + "tmpMP3Base64.mp3";
3. 将所有字节写入该路径File.WriteAllBytes(tempPath, audioBytes);
4. UnityWebRequestMultimedia使用。GetAudioClip从那个路径读取UnityWebRequest request = UnityWebRequestMultimedia.GetAudioClip(tempPath, AudioType.MPEG);

下面是一个完整的例子:

[SerializeField] private AudioSource _audioSource;
private void Start()
{
StartCoroutine(ConvertBase64ToAudioClip(EXAMPLE_BASE64_MP3_STRING, _audioSource));
}

IEnumerator ConvertBase64ToAudioClip(string base64EncodedMp3String, AudioSource audioSource)
{
var audioBytes = Convert.FromBase64String(base64EncodedMp3String);
var tempPath = Application.persistentDataPath + "tmpMP3Base64.mp3";
File.WriteAllBytes(tempPath, audioBytes);
UnityWebRequest request = UnityWebRequestMultimedia.GetAudioClip(tempPath, AudioType.MPEG);
yield return request.SendWebRequest();
if (request.result.Equals(UnityWebRequest.Result.ConnectionError))
Debug.LogError(request.error);
else
{
audioSource.clip = DownloadHandlerAudioClip.GetContent(request);
audioSource.Play();
}
File.Delete(tempPath);
}