70 lines
1.3 KiB
C++
70 lines
1.3 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 <cstdint>
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#include "image.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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class Webcam {
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public:
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Webcam(const std::string& device = "/dev/video0",
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int width = 640,
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int height = 480, bool mjpeg = false, bool passthrough = false);
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~Webcam();
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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 RGB888
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* format (ie, RGB24), as well as 'width', 'height' and 'size' (equal to
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* width * height * 3)
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*
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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 Image& frame(int timeout = 2);
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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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Image rgb_frame;
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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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bool force_format = true;
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bool passthrough_format;
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uint32_t format;
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};
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