fdk_aac编码,每帧音频的采样率

A HE-AAC v1 or v2 audio frame contains 2048 PCM samples per channel (there is
also one mode with 1920 samples per channel but this is only for special purposes
such as DAB+ digital radio).
These bits/frame figures are average figures where each AAC frame generally has a different
size in bytes. To calculate the same for AAC-LC just use 1024 instead of 2048 PCM samples per
frame and channel.
For AAC-LD/ELD it is either 480 or 512 PCM samples per frame and channel.

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