zoneminder/src/zm_event.h

//
// ZoneMinder Core Interfaces, $Date$, $Revision$
// Copyright (C) 2003, 2004, 2005, 2006  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_EVENT_H
#define ZM_EVENT_H

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#include <time.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <mysql/mysql.h>

#include "zm.h"
#include "zm_image.h"
#include "zm_stream.h"

class Monitor;

#define MAX_PRE_ALARM_FRAMES	16 // Maximum number of prealarm frames that can be stored

//
// Class describing events, i.e. captured periods of activity.
//
class Event
{
friend class EventStream;

protected:
	static bool		initialised;
	static char		capture_file_format[PATH_MAX];
	static char		analyse_file_format[PATH_MAX];
	static char		general_file_format[PATH_MAX];

protected:
	static int		sd;

protected:
    typedef enum { NORMAL, BULK, ALARM } FrameType;

	struct PreAlarmData
	{
		Image *image;
		struct timeval timestamp;
		unsigned int score;
		Image *alarm_frame;
	};

	static int pre_alarm_count;
	static PreAlarmData pre_alarm_data[MAX_PRE_ALARM_FRAMES];

protected:
	unsigned int	id;
	Monitor			*monitor;
	struct timeval	start_time;
	struct timeval	end_time;
	char			cause[32];
	char			text[256];
	int				frames;
	int				alarm_frames;
	unsigned int	tot_score;
	unsigned int	max_score;
	char			path[PATH_MAX];

protected:
	int				last_db_frame;

protected:
	static void Initialise()
	{
        if ( initialised )
            return;

		snprintf( capture_file_format, sizeof(capture_file_format), "%%s/%%0%dd-capture.jpg", config.event_image_digits );
		snprintf( analyse_file_format, sizeof(analyse_file_format), "%%s/%%0%dd-analyse.jpg", config.event_image_digits );
		snprintf( general_file_format, sizeof(general_file_format), "%%s/%%0%dd-%%s", config.event_image_digits );

		initialised = true;
	}

public:
	static bool OpenFrameSocket( int );
	static bool ValidateFrameSocket( int );

public:
	Event( Monitor *p_monitor, struct timeval p_start_time, const char *p_cause, const char *p_text="" );
	~Event();

	int Id() const { return( id ); }
	const char *Cause() { return( cause ); }
	const char *Text() { return( text ); }
	int Frames() const { return( frames ); }
	int AlarmFrames() const { return( alarm_frames ); }

	const struct timeval &StartTime() const { return( start_time ); }
	const struct timeval &EndTime() const { return( end_time ); }
	struct timeval &EndTime() { return( end_time ); }

	bool SendFrameImage( const Image *image, bool alarm_frame=false );
	bool WriteFrameImage( Image *image, struct timeval timestamp, const char *event_file, bool alarm_frame=false );

	void AddFrames( int n_frames, Image **images, struct timeval **timestamps );
	void AddFrame( Image *image, struct timeval timestamp, int score=0, Image *alarm_frame=NULL );

public:
    static const char *getSubPath( struct tm *time )
    {
        static char subpath[PATH_MAX] = "";
        snprintf( subpath, sizeof(subpath), "%02d/%02d/%02d/%02d/%02d/%02d", time->tm_year-100, time->tm_mon+1, time->tm_mday, time->tm_hour, time->tm_min, time->tm_sec );
        return( subpath );
    }
    static const char *getSubPath( time_t *time )
    {
        return( Event::getSubPath( localtime( time ) ) );
    }

public:
	static int PreAlarmCount()
	{
		return( pre_alarm_count );
	}
	static void EmptyPreAlarmFrames()
	{
		if ( pre_alarm_count > 0 )
		{
			for ( int i = 0; i < MAX_PRE_ALARM_FRAMES; i++ )
			{
				delete pre_alarm_data[i].image;
				delete pre_alarm_data[i].alarm_frame;
			}
			memset( pre_alarm_data, 0, sizeof(pre_alarm_data) );
		}
		pre_alarm_count = 0;
	}
	static void AddPreAlarmFrame( Image *image, struct timeval timestamp, int score=0, Image *alarm_frame=NULL )
	{
		pre_alarm_data[pre_alarm_count].image = new Image( *image );
		pre_alarm_data[pre_alarm_count].timestamp = timestamp;
		pre_alarm_data[pre_alarm_count].score = score;
		if ( alarm_frame )
		{
			pre_alarm_data[pre_alarm_count].alarm_frame = new Image( *alarm_frame );
		}
		pre_alarm_count++;
	}
	void SavePreAlarmFrames()
	{
		for ( int i = 0; i < pre_alarm_count; i++ )
		{
			AddFrame( pre_alarm_data[i].image, pre_alarm_data[i].timestamp, pre_alarm_data[i].score, pre_alarm_data[i].alarm_frame );
		}
		EmptyPreAlarmFrames();
	}
};

class EventStream : public StreamBase
{
public:
    typedef enum { MODE_SINGLE, MODE_ALL, MODE_ALL_GAPLESS } StreamMode;

protected:
    typedef struct FrameData {
        //unsigned long   id;
        time_t          timestamp;
        time_t          offset;
        double          delta;
        bool            in_db;
    };

    typedef struct EventData
    {
        unsigned long   event_id;
        unsigned long   monitor_id;
        unsigned long   frame_count;
        time_t          start_time;
        double          duration;
        char            path[PATH_MAX];
        int             n_frames;
        FrameData       *frames;
    };

protected:
    static const int STREAM_PAUSE_WAIT = 250000; // Microseconds

    static const StreamMode DEFAULT_MODE = MODE_SINGLE;

protected:
    StreamMode mode;

protected:
    int curr_frame_id;
    double curr_stream_time;

    EventData *event_data;

protected:
    bool loadEventData( int event_id );
    bool loadInitialEventData( int init_event_id, int init_frame_id );
    bool loadInitialEventData( int monitor_id, time_t event_time );

    void checkEventLoaded();
    void processCommand( const CmdMsg *msg );
    void sendFrame( int delta_us );

public:
    EventStream()
    {
        mode = DEFAULT_MODE;

        curr_frame_id = 0;
        curr_stream_time = 0.0;

        event_data = 0;
    }
	void setStreamStart( int init_event_id, int init_frame_id=0 )
    {
        loadInitialEventData( init_event_id, init_frame_id );
        loadMonitor( event_data->monitor_id );
    }
	void setStreamStart( int monitor_id, time_t event_time )
    {
        loadInitialEventData( monitor_id, event_time );
        loadMonitor( monitor_id );
    }
    void setStreamMode( StreamMode p_mode )
    {
        mode = p_mode;
    }
    void runStream();
};

#endif // ZM_EVENT_H