ios - 组合/连接多个音频文件 [英] ios - combine/concatenate multiple audio files

问题描述

我有一堆音频文件（mp3，aac，等等），我想将它们连接成1个音频文件。有没有人以前做过这个？

I have a bunch of audio files (mp3, aac, whatever) and I want to concatenate them into 1 audio file. Has anyone done this before?

推荐答案

我做到了这一点。要进行连接，首先需要将音频文件加载到 AVAssets 的。具体来说，您将要使用名为 AVURLAssets ，可以加载您的网址：加载AVAsset 。然后，您可以将每个 AVAsset 添加到 AVMutableComposition ，旨在包含多个 AVAssets 。一旦你将它加载到 AVMutableComposition ，你可以使用 AVAssetExportSession 将合成写入文件。

I have done this. To do the concatenation you first need to load the audio files into AVAssets. Specifically, you'll want to use a subclass of AVAsset called AVURLAssets, which can load up your URL: Loading AVAsset. You can then add each AVAsset into a AVMutableComposition, which is designed to contain multiple AVAssets. Once you've gotten it loaded into AVMutableComposition, you can use AVAssetExportSession to write the composition to a file.

注意 AVAssetExportSession 不会让您对文件输出有太多控制权（它会将音频导出到m4a文件中）。如果您需要更多地控制输出类型，则需要使用 AVAssetReader 和 AVAssetWriter 类执行导出而不是 AVAssetExportSession 。使用这些类比 AVAssetExportSession 要复杂得多，这里需要了解直接C。

Note that AVAssetExportSession doesn't give you much control over the file output (it'll export audio into a m4a file). If you need more control over the type of output, you'll need to use the AVAssetReader and AVAssetWriter classes to perform the export rather than the AVAssetExportSession. These classes are much more complex to use than AVAssetExportSession and it pays here to understand straight C.

我也会指出没有Apple提供的选项来写出MP3文件。你可以阅读它们，但你不能写它们。通常最好坚持使用m4a / aac格式。

I will also point out that there are no Apple-provided options to write out MP3 files. You can read them, but you can't write them. It's generally best to stick with a m4a/aac format.

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