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8148 audio decoder and encoder

In DVRRDK for 8148, we have aac encoder and decoder in DSP. Sometimes, I call Adec_process(), this Function return failed: AUDIO: DEC -> AUDIO: Rpe process call failed, status: 1, and  it can not get right, but if i call Aenc_process() to encode aac, it can get right.

what is the relationship between encoder and decoder:

Thanks in advance!