libusb打开uvc相机c++代码
时间: 2024-03-15 14:40:50 浏览: 274
当使用libusb库打开UVC相机时,需要进行以下骤:
1. 初始化libusb库:
```cpp
#include <libusb-1.0/libusb.h>
int main() {
libusb_context *ctx NULL;
int r = libusb_init(&ctx);
if (r < 0) {
// 初始化失败
return r;
}
// 其他操作
libusb_exit(ctx);
return 0;
}
```
2. 找到并打开UVC相机:
```cpp
libusb_device **devs;
libusb_device_handle *dev_handle;
ssize_t cnt = libusb_get_device_list(ctx, &devs);
if (cnt < 0) {
// 获取设备列表失败
return cnt;
}
for (size_t i = 0; i < cnt; i++) {
libusb_device *dev = devs[i];
struct libusb_device_descriptor desc;
int r = libusb_get_device_descriptor(dev, &desc);
if (r < 0) {
// 获取设备描述符失败
continue;
}
// 判断是否为UVC相机设备
if (desc.idVendor == UVC_VENDOR_ID && desc.idProduct == UVC_PRODUCT_ID) {
// 打开设备
r = libusb_open(dev, &dev_handle);
if (r < 0) {
// 打开设备失败
continue;
}
// 其他操作
break;
}
}
libusb_free_device_list(devs, 1);
```
3. 设置UVC相机参数:
```cpp
// 设置配置
int r = libusb_set_configuration(dev_handle, UVC_CONFIGURATION);
if (r < 0) {
// 设置配置失败
return r;
}
// 分配并设置接口
r = libusb_claim_interface(dev_handle, UVC_INTERFACE);
if (r < 0) {
// 设置接口失败
return r;
}
// 设置端点
libusb_endpoint_descriptor *ep_desc;
r = libusb_get_endpoint_descriptor(dev_handle, UVC_ENDPOINT_IN, &ep_desc);
if (r < 0) {
// 获取端点描述符失败
return r;
}
// 其他操作
```
4. 控制UVC相机:
```cpp
// 发送控制命令
unsigned char control_data[CONTROL_DATA_SIZE] = {0x00, 0x01, 0x02, ...};
int r = libusb_control_transfer(dev_handle, UVC_REQUEST_TYPE, UVC_REQUEST, UVC_VALUE, UVC_INDEX, control_data, CONTROL_DATA_SIZE, TIMEOUT);
if (r < 0) {
// 发送控制命令失败
return r;
}
// 其他操作
```
5. 关闭UVC相机和释放资源:
```cpp
libusb_release_interface(dev_handle, UVC_INTERFACE);
libusb_close(dev_handle);
```
希望以上代码能够帮助到你!
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