iOS 支持的音频播放格式：

*AAC

*HE-AAC

*AMR (Adaptive Multi-Rate, a format for speech)

*ALAC (Apple Lossless)

*iLBC (internet Low Bitrate Codec, another format for speech)

*IMA4 (IMA/ADPCM)

*linear PCM (uncompressed)

*μ-law and a-law

*MP3 (MPEG-1 audio layer 3）


iOS 支持的音频录制的 格式：

*AAC (on supported devices only)

*ALAC (Apple Lossless)

*iLBC (internet Low Bitrate Codec, for speech)

*IMA4 (IMA/ADPCM)

*linear PCM

*μ-law and a-law