Create IpcBitsLink OK , 但是无法申请空间！

status = IpcBitsOutLink_getEmptyVideoBitStreamBufs(SYSTEM_HOST_LINK_ID_IPC_BITS_OUT_0,
&emptyBufList,
&reqInfo);

OSA_assert(0 == status);

if(0 == emptyBufList.numBufs) //此条件一直为真
{
printf("unOK flag is : %d $$$$$$$$$$$$$$$$$$$$$$$$$",status);
return 0;
}

IpcBitsOutLink_putFullVideoBitStreamBufs(SYSTEM_HOST_LINK_ID_IPC_BITS_OUT_0,
&fullBufList);

求助是什么原因呢？