在WebRTC for iOS中测量麦克风级别 [英] Measure microphone level in WebRTC for iOS

问题描述

我有一个WebRTC iOS应用程序。
我有 AVAudioSession 和 RTCAudioSource 。
我需要检测麦克风何时开始接收响亮的声音（比如一个人开始说话时），类似于 hark 使用 AudioContext 在浏览器中执行操作。
如何检测它或获得类似于可以测量的流的内容，如 AVCaptureAudioChannel 或 AVCaptureAudioDataOutput ？

I have a WebRTC iOS application. There I have AVAudioSession and RTCAudioSource. I need to detect when a microphone starts receiving loud sounds (like when a person starts speaking) similar to what hark does in the browser with AudioContext. How can I detect it or get something that resembles stream that can be measured like AVCaptureAudioChannel or AVCaptureAudioDataOutput?

推荐答案

使用 AVAudioSession 请求录制音频的权限后，我会建议使用 AVAudioRecorder。这是一个相当简单的类，并且非常简单：

After using AVAudioSession to request permission to record audio, I would recommending using AVAudioRecorder. It is a fairly straightforward class and is as simple as:

• 创建<的实例code> AVAudioRecorder


• 在实例上调用方法 prepareToRecord


• 使用方法启用声音测光功能 meteringEnabled

• Create an instance of AVAudioRecorder
• Call the method prepareToRecord on the instance
• Enable the sound metering function using the method meteringEnabled

启用录制后，您可以使用 averagePowerForChannel：方法访问录制音量 测量 。

After enabling the recording, you can access the recording volume measurement using the method averagePowerForChannel:.

您可能想要阅读Apple的文档

~~~~~~~~~~~~~~~~~~~~~ ~~~ 注意 ~~~~~~~~~~~~~~~~~~~~~~~

~~~~~~~~~~~~~~~~~~~~~~~ N O T E ~~~~~~~~~~~~~~~~~~~~~~~

我不熟悉WebRTC框架/功能，但 AVAudioRecorder 类将使您能够在录制过程中测量音频输入。

I am not familiar with the WebRTC framework/functionality, but the AVAudioRecorder class will provide you with the ability to measure the audio input during a recording.

~~~~~~~~~~~~~~~~~~~~~~ SAMPLE ~~~~~~~~~~~~~~~~~~~~~~

~~~~~~~~~~~~~~~~~~~~~~ S A M P L E ~~~~~~~~~~~~~~~~~~~~~~

我已经包含了一个GitHub 示例项目，我过去曾使用过。设置为使用我所描述的AVAudioRecorder类检测音频的灵敏度。

I've included a GitHub sample project that I've used in the past. It is setup to detect sensitivity of the audio using the AVAudioRecorder class that I've described.

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