kopia lustrzana https://github.com/F5OEO/rpidatv
72 wiersze
1.5 KiB
C++
72 wiersze
1.5 KiB
C++
/** Small C++ wrapper around V4L example code to access the webcam
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**/
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#include <string>
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#include <memory> // unique_ptr
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#include <linux/videodev2.h>
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struct buffer {
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void *data;
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size_t size;
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};
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struct YUV420Image {
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unsigned char *data; // YUV420
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size_t width;
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size_t height;
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size_t size; // width * height * 3/2
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};
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class Webcam {
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public:
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Webcam(const std::string& device = "/dev/video0");
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~Webcam();
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void GetCameraSize(int& Width,int& Height);
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int ConvertColor(unsigned char *out,unsigned char *in);
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void SetOmxBuffer(unsigned char* Buffer);
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/** Captures and returns a frame from the webcam.
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*
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* The returned object contains a field 'data' with the image data in YUV420
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* format
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* This call blocks until a frame is available or until the provided
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* timeout (in seconds).
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*
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* Throws a runtime_error if the timeout is reached.
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*/
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const YUV420Image& frame(int timeout = 1);
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private:
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void init_mmap();
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void open_device();
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void close_device();
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void init_device();
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void uninit_device();
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void start_capturing();
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void stop_capturing();
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bool read_frame();
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std::string device;
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int fd;
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YUV420Image yuv420frame;
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struct buffer *buffers;
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unsigned int n_buffers;
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size_t xres, yres;
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size_t stride;
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struct v4l2_format fmt;
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bool force_format = false;
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bool StatusCapturing=false;
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};
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