从ios设备的内置扬声器录制音频

Question

是否可以从ios设备的扬声器录制音频。

例如，如果我正在播放视频，我想从该视频中提取音频。

如果这个问题含糊不清，我很抱歉。

Answer 1

您应该查看AVAudioRecorder类，它是AVFoundation框架的一部分。

来自Apple Docs：

An instance of the AVAudioRecorder class, called an audio recorder,
provides audio recording capability in your application.
Using an audio recorder you can:

- Record until the user stops the recording
- Record for a specified duration
- Pause and resume a recording
- Obtain input audio-level data that you can use to provide level metering

In iOS, the audio being recorded comes from the device connected by the 
user—built-in microphone or headset microphone, for example. 
In OS X, the audio comes from the system’s default audio input device as
set by a user in System Preferences.

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