当AudioClip是由Microphone.Start在统一中创建时，如何使用PCMReaderCallback从Microphone.Start读取数据？

Question

如何更改下面的代码以使用PCMReaderCallback从Microphone.Start创建的音频剪辑中读取数据

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class NewBehaviourScript : MonoBehaviour
{
    private string m_deviceName = null;
    private AudioClip m_audioClip;

    void Start()
    {
        bool loop = true;
        int lengthSec = 10;
        int frequency = 44100;

        m_audioClip = Microphone.Start(m_deviceName, loop, lengthSec, frequency);
    }

    void Stop()
    {
        Microphone.End(m_deviceName);
        m_audioClip = null;
    }
}

Answer 1

不能将麦克风API与PCMReaderCallback一起使用。这是因为PCMReaderCallback是通过将PCMReaderCallback函数传递给返回新AudioClip的AudioClip.Create函数来注册的。Unity的Microphone.Start函数返回AudioClip，但它不以PCMReaderCallback作为参数。

如果这不是一个麦克风，而是一个简单的音频剪辑，那么您可以使用下面的示例：

public int lengthSamples = 400;
public int channels = 2;
public int frequency = 16000;

AudioSource adSource;

void Start()
{
    adSource = GetComponent<AudioSource>();
    AudioClip clip = AudioClip.Create("clip", lengthSamples, channels, frequency, true, OnAudioRead);
    adSource.clip = clip;
    adSource.Play();
}

//PCMReaderCallback callback
void OnAudioRead(float[] data)
{

}

如果您只想从Mic读取音频数据，仍然可以使用OnAudioFilterRead或AudioSource.clip.GetData函数。下面是OnAudioFilterRead的一个示例。

string m_deviceName = null;
AudioSource adSource;

void Start()
{
    adSource = GetComponent<AudioSource>();
    bool loop = true;
    int lengthSec = 10;
    int frequency = 44100;

    AudioClip clip = Microphone.Start(m_deviceName, loop, lengthSec, frequency);
    adSource.clip = clip;
    while (!(Microphone.GetPosition(null) > 0)) { }

    adSource.Play();
}

void OnAudioFilterRead(float[] data, int channels)
{

}