zoneminder/src/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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// 

#ifndef ZM_LOCAL_CAMERA_H
#define ZM_LOCAL_CAMERA_H

#include "zm.h"
#include "zm_camera.h"
#include "zm_image.h"

#if ZM_HAS_V4L

#ifdef HAVE_LINUX_VIDEODEV_H
#include <linux/videodev.h>
#endif // HAVE_LINUX_VIDEODEV_H
#ifdef HAVE_LINUX_VIDEODEV2_H
#include <linux/videodev2.h>
#endif // HAVE_LINUX_VIDEODEV2_H

#include "zm_ffmpeg.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:
#if ZM_HAS_V4L2
    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;
    };
#endif // ZM_HAS_V4L2

#if ZM_HAS_V4L1
    struct V4L1Data
    {
        int active_frame;
        video_mbuf frames;
        video_mmap *buffers;
        unsigned char *bufptr;
    };
#endif // ZM_HAS_V4L1

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;

#if ZM_HAS_V4L2
	static V4L2Data         v4l2_data;
#endif // ZM_HAS_V4L2
#if ZM_HAS_V4L1
	static V4L1Data         v4l1_data;
#endif // ZM_HAS_V4L1

#if HAVE_LIBSWSCALE
	static AVFrame    	**capturePictures;
	PixelFormat       	imagePixFormat;
	PixelFormat       	capturePixFormat;
	struct SwsContext 	*imgConversionContext;
	AVFrame           	*tmpPicture;    
#endif // HAVE_LIBSWSCALE

	static LocalCamera      *last_camera;

public:
	LocalCamera( int p_id, 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, 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 Brightness( int p_brightness=-1 );
	int Hue( int p_hue=-1 );
	int Colour( int p_colour=-1 );
	int Contrast( int p_contrast=-1 );

	int PrimeCapture();
	int PreCapture();
	int Capture( Image &image );
	int PostCapture();

	static bool GetCurrentSettings( const char *device, char *output, int version, bool verbose );
};

#endif // ZM_HAS_V4L

#endif // ZM_LOCAL_CAMERA_H