zoneminder/src/zm_stream.h

//
// ZoneMinder Stream Interfaces, $Date$, $Revision$
// 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_STREAM_H
#define ZM_STREAM_H

#include <sys/un.h>
#include <sys/socket.h>

#include "zm.h"
#include "zm_mpeg.h"

class Monitor;

#define TV_2_FLOAT( tv ) ( double((tv).tv_sec) + (double((tv).tv_usec) / 1000000.0) )

class StreamBase
{
public:
    typedef enum { STREAM_JPEG, STREAM_RAW, STREAM_ZIP, STREAM_SINGLE, STREAM_MPEG } StreamType;

protected:
    static const int MAX_STREAM_DELAY = 5; // Seconds

    static const StreamType DEFAULT_TYPE = STREAM_JPEG;
    enum { DEFAULT_RATE=ZM_RATE_BASE };
    enum { DEFAULT_SCALE=ZM_SCALE_BASE };
    enum { DEFAULT_ZOOM=ZM_SCALE_BASE };
    enum { DEFAULT_MAXFPS=10 };
    enum { DEFAULT_BITRATE=100000 };

protected:
    typedef struct {
        int msg_type;
        char msg_data[16];
    } CmdMsg;

    typedef struct {
        int msg_type;
        char msg_data[256];
    } DataMsg;

    typedef enum { MSG_CMD=1, MSG_DATA_WATCH, MSG_DATA_EVENT } MsgType;
    typedef enum { CMD_NONE=0, CMD_PAUSE, CMD_PLAY, CMD_STOP, CMD_FASTFWD, CMD_SLOWFWD, CMD_SLOWREV, CMD_FASTREV, CMD_ZOOMIN, CMD_ZOOMOUT, CMD_PAN, CMD_SCALE, CMD_PREV, CMD_NEXT, CMD_SEEK, CMD_VARPLAY, CMD_QUERY=99 } MsgCommand;

protected:
    Monitor *monitor;

    StreamType type;
    const char *format;
    int replay_rate;
    int scale;
    int zoom;
    double maxfps;
    int bitrate;
    unsigned short x, y;

protected:
    int connkey;
    int sd;
	char loc_sock_path[PATH_MAX];
    struct sockaddr_un loc_addr;
	char rem_sock_path[PATH_MAX];
    struct sockaddr_un rem_addr;

protected:
    bool paused;
    int step;

    struct timeval now;

    double base_fps;
    double effective_fps;
    int frame_mod;

    double last_frame_sent;
    struct timeval last_frame_timestamp;

#if HAVE_LIBAVCODEC     
    VideoStream *vid_stream;
#endif // HAVE_LIBAVCODEC     

    CmdMsg msg;

protected:
    bool loadMonitor( int monitor_id );
    bool checkInitialised();
    void updateFrameRate( double fps );
    Image *prepareImage( Image *image );
    bool sendTextFrame( const char *text );
    bool checkCommandQueue();
    virtual void processCommand( const CmdMsg *msg )=0;

public:
    StreamBase()
    {
        monitor = 0;

        type = DEFAULT_TYPE;
        format = "";
        replay_rate = DEFAULT_RATE;
        scale = DEFAULT_SCALE;
        zoom = DEFAULT_ZOOM;
        maxfps = DEFAULT_MAXFPS;
        bitrate = DEFAULT_BITRATE;

        paused = false;
        step = 0;
        x = 0;
        y = 0;

        connkey = 0;
        sd = -1;
        memset( &loc_sock_path, 0, sizeof(loc_sock_path) );
        memset( &loc_addr, 0, sizeof(loc_addr) );
        memset( &rem_sock_path, 0, sizeof(rem_sock_path) );
        memset( &rem_addr, 0, sizeof(rem_addr) );

        base_fps = 0.0;
        effective_fps = 0.0;
        frame_mod = 1;

#if HAVE_LIBAVCODEC     
        vid_stream = 0;
#endif // HAVE_LIBAVCODEC     
    }
    virtual ~StreamBase();

	void setStreamType( StreamType p_type )
    {
        type = p_type;
    }
	void setStreamFormat( const char *p_format )
    {
        format = p_format;
    }
	void setStreamScale( int p_scale )
    {
        scale = p_scale;
    }
	void setStreamReplayRate( int p_rate )
    {
        replay_rate = p_rate;
    }
	void setStreamMaxFPS( double p_maxfps )
    {
        maxfps = p_maxfps;
    }
	void setStreamBitrate( int p_bitrate )
    {
        bitrate = p_bitrate;
    }
	void setStreamQueue( int p_connkey )
    {
        connkey = p_connkey;
    }
    virtual void openComms();
    virtual void closeComms();
    virtual void runStream()=0;
};

#endif // ZM_STREAM_H