hi3518e回声消除问题

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遇到不能播放的问题：
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press sample command as follows!
1:  send audio frame to AENC channel form AI, save them
2:  read audio stream from file,decode and send AO
3:  start AI to AO loop
q:  quit whole audio sample

sample command:2
open stream file:"audio_chn0.adpcm" for adec ok
bind adec:0 to ao(0,0) ok

please press twice ENTER to exit this sample
[Func]:AdecSendStream [Line]:776 [Info]:adec chn: 0 has no free buffer to save decode frame data!
SAMPLE_COMM_AUDIO_AdecProc: HI_MPI_ADEC_SendStream(0) failed with 0xa018800f!