Traversal error while adding about hashmap

[DavidLeeds]

Hi @fancong5201314,

The hashmap does not allocate storage for keys by default. Since your key is stored on the stack char key_str[32] = {0};, it is invalidated as soon as you go out of scope of the while loop body. You have a couple choices to fix this:

1. since your key is a numeric frame ID, change your key type to uint64_t and pass in a pointer to the frame_id already stored in MCV_ALGORITHM_RESULT_ST. This will eliminate the need to do additional memory allocation for keys.
2. Alternatively, set a key allocator and allow the hashmap to manage memory for key strings. E.g. hashmap_set_key_alloc_funcs(map, strdup, free).

On a different topic, is there any reason FRAME_ALGORITHM_RESULT_ST has a pointer to NPU_IMAGE_ST and MCV_ALGORITHM_RESULT_ST, instead of just containing those structures? If possible, I would do that as it could improve performance by requiring fewer mallocs and reducing memory fragmentation.