audio_file_list = para_malloc(num_audio_files * sizeof(char *));
audio_file_count = 0;
/* second run (hot dentry cache, hopefully), fill audio_file_list */
audio_file_list = para_malloc(num_audio_files * sizeof(char *));
audio_file_count = 0;
/* second run (hot dentry cache, hopefully), fill audio_file_list */