使用AVAudioSession进行AAC录音的最佳设置是什么？

问题描述

我希望在iPhone上录制语音，并生成一个针对小尺寸和录音质量而优化的文件。使用下面的AAC设置，文件较小，但是我不确定质量是否达到最佳。除了反复试验之外，我还有什么可以找的，或者有什么建议吗？

I'm looking to record voice on the iPhone and produce a file that is optimized for small size and recording quality for voice. With the settings below for AAC I'm getting a small file size, but I'm not sure I'm getting optimal quality. Other than trial and error, is there anything I can turn to, or any recommendations?

[recordSetting setValue:[NSNumber numberWithFloat:8000.0] forKey:AVSampleRateKey];
[recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey]; 
[recordSetting setValue:[NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey];
[recordSetting setObject:[NSNumber numberWithInt:AVAudioQualityLow] forKey: AVEncoderAudioQualityKey]; 
[recordSetting setValue:[NSNumber numberWithInt: 8000] forKey:AVEncoderBitRateKey];

推荐答案

有几种针对语音优化的编解码器，包括。以8kHz的采样率使用iLBC将导致每小时记录大约7MB的文件。

There are several codecs which are optimized for voice, including iLBC. Using iLBC at the 8kHz sample rate that you have will result in a file that is approximately 7MB per hour of recording.

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