使用音频文件将MP3转换为AAC使用回调初始化

For my iOS application, I need to convert an MP3 File Stored in a NSData object to AAC format which will also be stored in a NSData object to be later streamed. I'm also doing some DSP in between the conversion, so I'm taking advantage of AudioFileOpenWithCallbacks to open the existing, in-Memory, MP3 File and this works fine.For my iOS application, I need to convert an MP