hi3520音频采集保存到本地

大家好，运行mdk给的例程有错误，
# ./sample_audio 23

/************************************/
press sample command as follows!
1:  start AI to AO loop
2:  send audio frame to AENC channel from AI, save them
3:  read audio stream from file,decode and send AO
4:  start AI to AO(Hdmi) loop
q:  quit whole audio sample

sample command:2
hello world ************* 1
AEC_Init error framelen(320)
[Func]:MPI_AI_AecInit [Line]:369 [Info]:aec open fail.
hello world ************* 2
hello world ************* 1
AEC_Init error framelen(320)
[Func]:MPI_AI_AecInit [Line]:369 [Info]:aec open fail.
hello world ************* 2
Ai(0,0) bind to AencChn:0 ok!
open stream file:"audio_chn0.pcm" for aenc ok
bind adec:0 to ao(0,0) ok

please press twice ENTER to exit this sample


就这样卡住了