usb_cam.h

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 *
 * Software License Agreement (BSD License)
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#pragma once
 
#include <asm/types.h> /* for videodev2.h */
#include <malloc.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
 
#ifndef __aarch64__
#include <immintrin.h>
#include <x86intrin.h>
#endif
 
extern "C" {
#include <libavcodec/avcodec.h>
#include <libavutil/mem.h>
#include <libswscale/swscale.h>
#include <linux/videodev2.h>
}
 
#include <libavcodec/version.h>
#if LIBAVCODEC_VERSION_MAJOR < 55
#define AV_CODEC_ID_MJPEG CODEC_ID_MJPEG
#endif
 
#include <memory>
#include <sstream>
#include <string>
 
#include "cyber/cyber.h"
 
#include "modules/drivers/camera/proto/config.pb.h"
 
namespace apollo {
namespace drivers {
namespace camera {
 
using apollo::drivers::camera::config::Config;
using apollo::drivers::camera::config::IO_METHOD_MMAP;
using apollo::drivers::camera::config::IO_METHOD_READ;
using apollo::drivers::camera::config::IO_METHOD_UNKNOWN;
using apollo::drivers::camera::config::IO_METHOD_USERPTR;
using apollo::drivers::camera::config::RGB;
using apollo::drivers::camera::config::YUYV;
 
// camera raw image struct
struct CameraImage {
  int width;
  int height;
  int bytes_per_pixel;
  int image_size;
  int is_new;
  int tv_sec;
  int tv_usec;
  char* image;
 
  ~CameraImage() {
    if (image != nullptr) {
      free(reinterpret_cast<void*>(image));
      image = nullptr;
    }
  }
};
 
typedef std::shared_ptr<CameraImage> CameraImagePtr;
 
struct buffer {
  void* start;
  size_t length;
};
 
class UsbCam {
 public:
  UsbCam();
  virtual ~UsbCam();
 
  virtual bool init(const std::shared_ptr<Config>& camera_config);
  // user use this function to get camera frame data
  virtual bool poll(const CameraImagePtr& raw_image, 
                    const CameraImagePtr& sensor_raw_image);
 
  bool is_capturing();
  bool wait_for_device(void);
 
 private:
  int xioctl(int fd, int request, void* arg);
  bool init_device(void);
  bool uninit_device(void);
 
  void set_device_config();
  // enables/disable auto focus
  void set_auto_focus(int value);
  // set video device parameters
  void set_v4l_parameter(const std::string& param, int value);
  void set_v4l_parameter(const std::string& param, const std::string& value);
 
  int init_mjpeg_decoder(int image_width, int image_height);
  void mjpeg2rgb(char* mjepg_buffer, int len, char* rgb_buffer, int pixels);
#ifdef __aarch64__
  int convert_yuv_to_rgb_pixel(int y, int u, int v);
  int convert_yuv_to_rgb_buffer(unsigned char* yuv, unsigned char* rgb,
                                unsigned int width, unsigned int height);
#endif
 
  bool init_read(unsigned int buffer_size);
  bool init_mmap(void);
  bool init_userp(unsigned int buffer_size);
  bool set_adv_trigger(void);
  bool close_device(void);
  bool open_device(void);
  bool read_frame(CameraImagePtr raw_image, CameraImagePtr sensor_raw_image);
  bool process_image(void* src, int len, CameraImagePtr dest);
  bool start_capturing(void);
  bool stop_capturing(void);
  void reconnect();
  void reset_device();
 
  std::shared_ptr<Config> config_;
  int pixel_format_;
  int fd_;
  buffer* buffers_;
  unsigned int n_buffers_;
  bool is_capturing_;
  uint64_t image_seq_;
 
  AVFrame* avframe_camera_;
  AVFrame* avframe_rgb_;
  AVCodec* avcodec_;
  AVDictionary* avoptions_;
  AVCodecContext* avcodec_context_;
  int avframe_camera_size_;
  int avframe_rgb_size_;
  struct SwsContext* video_sws_;
 
  float frame_warning_interval_ = 0.0;
  float device_wait_sec_ = 0.0;
  uint64_t last_nsec_ = 0;
  float frame_drop_interval_ = 0.0;
};
}  // namespace camera
}  // namespace drivers
}  // namespace apollo