DCMI_MAIN_CMD_DVPP命令说明

函数原型

int dcmi_get_device_info(int card_id, int device_id, enum dcmi_main_cmd main_cmd, unsigned int sub_cmd, void *buf, unsigned int *size)

功能说明

获取dvpp相关状态，配置信息。

参数说明

参数名称	输入/输出	类型	描述
card_id	输入	int	指定NPU管理单元的ID，当前实际支持的ID通过dcmi_get_card_list接口获取。
device_id	输入	int	指定设备编号，通过dcmi_get_device_id_in_card接口获取。取值范围如下： NPU芯片：[0, device_id_max-1]。
main_cmd	输入	enum dcmi_main_cmd	DCMI_MAIN_CMD_DVPP
sub_cmd	输入	unsigned int	sub_cmd 获取对应模块下子属性信息。 /* DCMI sub command for DVPP module */ #define DCMI_SUB_CMD_DVPP_STATUS 0 // dvpp状态，buf为0表示状态正常，非0表示状态异常 #define DCMI_SUB_CMD_DVPP_VDEC_RATE 1 // vdec利用率，正常值范围0-100 #define DCMI_SUB_CMD_DVPP_VPC_RATE 2 // vpc利用率，正常值范围0-100 #define DCMI_SUB_CMD_DVPP_VENC_RATE 3 // venc利用率，正常值范围0-100 #define DCMI_SUB_CMD_DVPP_JPEGE_RATE 4 // jpege利用率，正常值范围0-100 #define DCMI_SUB_CMD_DVPP_JPEGD_RATE 5 // jpegd利用率，正常值范围0-100 目前不支持DCMI_SUB_CMD_DVPP_VENC_RATE命令的查询。
buf	输出	void *	用于接收设备信息的返回值。
size	输入/输出	unsigned int *	buf数组的输入/输出长度。

返回值

类型	描述
int	处理结果：成功：返回0。失败：返回码请参见返回码。

异常处理

无。

约束说明

获取dvpp设备时sub_cmd，buf和size之间必须要满足以下关系，如果不满足会导致接口调用失败。

表1 sub_cmd对应的buf格式
sub_cmd	buf对应的数据类型	size
DCMI_SUB_CMD_DVPP_STATUS	unsigned int	长度为：sizeof(unsigned int)
DCMI_SUB_CMD_DVPP_VDEC_RATE DCMI_SUB_CMD_DVPP_VPC_RATE DCMI_SUB_CMD_DVPP_VENC_RATE DCMI_SUB_CMD_DVPP_JPEGE_RATE DCMI_SUB_CMD_DVPP_JPEGD_RATE	unsigned int	长度为：sizeof(unsigned int)

表2 部署场景
Linux物理机		Linux物理机容器
root用户	运行用户组（非root用户）	root用户
Y	Y	Y

调用示例

int ret;
int ratio = 0;
int ratio_size = sizeof(int);
int dev_cnt = 0;
int dev_id[64] = {0};
ret = dcmi_get_device_count(&dev_cnt);
if (ret != 0) {
printf("[%s] get dev_cnt test_fail value = %d \n", __func__, ret);
return -1;
}
if (dev_cnt <= 0) {
printf("[%s] get dev_cnt test_fail value = -1 , dev_cnt:%d \n", __func__, dev_cnt);
return -1;
}
printf("[%s] dev_cnt:%d \n", __func__, dev_cnt);
ret = dcmi_list_device(dev_id, dev_cnt);
if (ret != 0) {
printf("[%s] list device test_fail value = %d \n", __func__, ret);
return -1;
}
for (int i = 0; i < dev_cnt; i++) {
printf("---------devid:%d dvpp ratio:---------\n", dev_id[i]);
ret = dcmi_get_device_info(dev_id[i], DCMI_MAIN_CMD_DVPP, DCMI_SUB_CMD_DVPP_VDEC_RATE, (void*)&ratio, &ratio_size);
if (ret != 0) {
printf("[%s %d] dev_id:%d sub_cmd:0x%x, ratio:(0x%x,%d)  test_fail value = %d\n", __func__, __LINE__, dev_id[i], DCMI_SUB_CMD_DVPP_VDEC_RATE, ratio, ratio, ret);
return -1;
}
printf("----vdec:%d \n",  ratio);
ratio = 0;
ret = dcmi_get_device_info(dev_id[i], DCMI_MAIN_CMD_DVPP, DCMI_SUB_CMD_DVPP_VENC_RATE, (void*)&ratio, &ratio_size);
if (ret != 0) {
printf("[%s %d] dev_id:%d sub_cmd:0x%x, ratio:(0x%x,%d)  test_fail value = %d\n", __func__, __LINE__, dev_id[i], DCMI_SUB_CMD_DVPP_VENC_RATE, ratio, ratio, ret);
return -1;
}
ratio = 0;
ret = dcmi_get_device_info(dev_id[i], DCMI_MAIN_CMD_DVPP, DCMI_SUB_CMD_DVPP_VPC_RATE, (void*)&ratio, &ratio_size);
if (ret != 0) {
printf("[%s %d] dev_id:%d sub_cmd:0x%x, ratio:(0x%x,%d)   test_fail value = %d\n", __func__, __LINE__, dev_id[i], DCMI_SUB_CMD_DVPP_VPC_RATE, ratio, ratio, ret);
return -1;
}
ratio = 0;
ret = dcmi_get_device_info(dev_id[i], DCMI_MAIN_CMD_DVPP, DCMI_SUB_CMD_DVPP_JPEGE_RATE, (void*)&ratio, &ratio_size);
if (ret != 0) {
printf("[%s %d] dev_id:%d sub_cmd:0x%x, ratio:(0x%x,%d)   test_fail value = %d\n", __func__, __LINE__, dev_id[i], DCMI_SUB_CMD_DVPP_JPEGE_RATE, ratio, ratio, ret);
return -1;
}
ratio = 0;
ret = dcmi_get_device_info(dev_id[i], DCMI_MAIN_CMD_DVPP, DCMI_SUB_CMD_DVPP_JPEGD_RATE, (void*)&ratio, &ratio_size);
if (ret != 0) {
printf("[%s %d] dev_id:%d sub_cmd:0x%x, ratio:(0x%x,%d)  test_fail value = %d\n", __func__, __LINE__, dev_id[i], DCMI_SUB_CMD_DVPP_JPEGD_RATE, ratio, ratio, ret);
return -1;
}
}

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