录制直播音频 [英] record live streaming audio

问题描述

我实际上正在制作一个必须在ipad上播放和录制来自互联网的流媒体音频的应用。音频的流媒体已经完成，我将很快到录音部分，我不知道如何继续。

I'm actually making an app which has to play and record streaming audio from internet on ipad. The streaming of the audio is done, I will have to come to the recording part very soon and I don't have any idea on how to proceed.

你能不能给我暗示一下???理念？它必须在录制到AAC或MP3的同时播放。

Could you give me a hint??? Idea? It will have to play while simultaneously recording into AAC or MP3.

谢谢。

推荐答案

您需要使用较低级别的AudioQueue API，并使用AudioSession API设置音频会话。

You'll need to use the lower-level AudioQueue API, and use the AudioSession API to set up the audio session.

然后您需要填写 AudioStreamBasicDescription 结构并使用 AudioQueueNewInput（）创建一个新的输入队列，并包含用于处理输入的回调函数缓冲区。

Then you'll need to fill out an AudioStreamBasicDescription struct and create a new input queue with AudioQueueNewInput() and include your callback function for handling input buffers.

然后你需要使用 AudioQueueAllocateBuffer（）和 AudioQueueEnqueueBuffer（）。只有这样你才能准备好打电话给 AudioQueueStart（）。您还应该处理音频会话中断，并处理停止音频队列。

And then you'll need to create 3 buffers using AudioQueueAllocateBuffer() and AudioQueueEnqueueBuffer(). And only then will you be ready to call AudioQueueStart(). You should also handle audio session interruptions, and handle stopping the audio queue.

这将为您提供包含未压缩的16位整数PCM音频数据的缓冲区流。你仍然需要压缩数据，这是另一种涉及使用 AudioConverter API的蠕虫，我还没有在iPhone OS上做过，所以我不知道什么会在那里工作。

That will just get you a stream of buffers containing uncompressed 16-bit integer PCM audio data. You still need to compress the data, which is another can of worms that involves using the AudioConverter API, which I haven't done on the iPhone OS so I don't know what will work there.

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