zm_local_camera.h

//
// ZoneMinder Local Camera Class Interface, $Date$, $Revision$
// Copyright (C) 2001-2008 Philip Coombes
// 
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
// 

#ifndef ZM_LOCAL_CAMERA_H
#define ZM_LOCAL_CAMERA_H

#include "zm_camera.h"

#if ZM_HAS_V4L2

#include <linux/videodev2.h>

//
// Class representing 'local' cameras, i.e. those which are
// directly connect to the host machine and which are accessed
// via a video interface.
//
class LocalCamera : public Camera {
protected:
    struct V4L2MappedBuffer {
        void    *start;
        size_t  length;
    };

    struct V4L2Data {
        v4l2_cropcap        cropcap;
        v4l2_crop           crop;
        v4l2_format         fmt;
        v4l2_requestbuffers reqbufs;
        V4L2MappedBuffer    *buffers;
        v4l2_buffer         *bufptr;
    };

protected:
  std::string device;
  int channel;
  int standard;
  int palette;
  bool device_prime;
  bool channel_prime;
  int channel_index;
  unsigned int extras;
  
  unsigned int conversion_type; /* 0 = no conversion needed, 1 = use libswscale, 2 = zm internal conversion, 3 = jpeg decoding */
  convert_fptr_t conversion_fptr; /* Pointer to conversion function used */
  
  uint32_t AutoSelectFormat(int p_colours);

  static int camera_count;
  static int channel_count;
  static int channels[VIDEO_MAX_FRAME];
  static int standards[VIDEO_MAX_FRAME];
  static int vid_fd;
  static int v4l_version;
  bool  v4l_multi_buffer;
  unsigned int v4l_captures_per_frame;

  static V4L2Data         v4l2_data;

  static AVFrame      **capturePictures;
  _AVPIXELFORMAT         imagePixFormat;
  _AVPIXELFORMAT         capturePixFormat;
  struct SwsContext   *imgConversionContext;
  AVFrame             *tmpPicture;    

  static LocalCamera      *last_camera;

public:
  LocalCamera(
    const Monitor *monitor,
    const std::string &device,
    int p_channel,
    int p_format,
    bool v4lmultibuffer,
    unsigned int v4lcapturesperframe,
    const std::string &p_method,
    int p_width,
    int p_height,
    int p_colours,
    int p_palette,
    int p_brightness,
    int p_contrast,
    int p_hue,
    int p_colour,
    bool p_capture,
    bool p_record_audio,
    unsigned int p_extras = 0);
  ~LocalCamera();

  void Initialise();
  void Terminate();

  const std::string &Device() const { return device; }

  int Channel() const { return channel; }
  int Standard() const { return standard; }
  int Palette() const { return palette; }
  int Extras() const { return extras; }

  int Control(int vid_id, int newvalue=-1 );
  int Brightness( int p_brightness=-1 ) override;
  int Hue( int p_hue=-1 ) override;
  int Colour( int p_colour=-1 ) override;
  int Contrast( int p_contrast=-1 ) override;

  int PrimeCapture() override;
  int PreCapture() override;
  int Capture(std::shared_ptr<ZMPacket> &p) override;
  int PostCapture() override;
  int Close() override;
  static bool GetCurrentSettings(const std::string &device, char *output, int version, bool verbose);
};

#endif // ZM_HAS_V4L2

#endif // ZM_LOCAL_CAMERA_H