systems.hpp

Motion JPEG编解码器源代码

/*
 *  interact.h:  Program/System stream packet generator
 *
 *  Copyright (C) 2003 Andrew Stevens <[e-mail]>
 *
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of version 2 of the GNU General Public License
 *  as published by the Free Software Foundation.
 *
 *  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 __SYSTEMS_HH__
#define __SYSTEMS_HH__

#include "inputstrm.hpp"
#include "outputstrm.hpp"
#include <vector>

using std::vector;

/* Buffer size parameters */

#define MAX_SECTOR_SIZE         16384
#define MAX_PACK_HEADER_SIZE	255
#define MAX_SYS_HEADER_SIZE     255


typedef struct sector_struc	/* Ein Sektor, kann Pack, Sys Header	*/
/* und Packet enthalten.		*/
{   unsigned char  buf [MAX_SECTOR_SIZE] ;
  unsigned int   length_of_packet_data ;
  //clockticks TS                ;
} Sector_struc;

struct Pack_struc	/* Pack Info				*/
{ 
    uint8_t buf[MAX_PACK_HEADER_SIZE];
    int length;
    clockticks SCR;
};

struct Sys_header_struc	/* System Header Info			*/
{   
    uint8_t buf[MAX_SYS_HEADER_SIZE];
    int length;
};


class PS_Stream
{
public:
    PS_Stream( unsigned _mpeg,
               unsigned int _sector_size,
               OutputStream &_output_strm, 
               off_t max_segment_size // 0 = No Limit
        );
    virtual ~PS_Stream();

    unsigned int PacketPayload( MuxStream &strm,
                                Sys_header_struc *sys_header, 
                                Pack_struc *pack_header, 
                                int buffers, int PTSstamp, int DTSstamp );

    unsigned int CreateSector (Pack_struc	 	 *pack,
                               Sys_header_struc *sys_header,
                               unsigned int     max_packet_data_size,
                               MuxStream        &strm,
                               bool 	 buffers,
                               bool      end_marker,
                               clockticks   	 PTS,
                               clockticks   	 DTS,
                               uint8_t 	 timestamps
        );
    static void BufferSectorHeader( uint8_t *buf,
                             Pack_struc	 	 *pack,
                             Sys_header_struc *sys_header,
                             uint8_t *&header_end );
    static void BufferPacketHeader( uint8_t *buf,
                                    uint8_t type,
                                    unsigned int mpeg_version,
                                    bool buffers,
                                    unsigned int buffer_size,
                                    uint8_t buffer_scale,
                                    clockticks   	 PTS,
                                    clockticks   	 DTS,
                                    uint8_t 	 timestamps,
                                    unsigned int min_pes_hdr_len,
                                    uint8_t     *&size_field,
                                    uint8_t     *&header_end );
    
    static inline void 
    BufferPacketSize( uint8_t *size_field, uint8_t *packet_end )
        {
            unsigned int packet_size = packet_end-size_field-2;
            size_field[0] = static_cast<uint8_t>(packet_size>>8);
            size_field[1] = static_cast<uint8_t>(packet_size&0xff);

        }

    virtual void CreatePack ( Pack_struc	 *pack,
                      clockticks   SCR,
                      unsigned int 	 mux_rate
        );
    virtual void CreateSysHeader ( Sys_header_struc *sys_header,
                           unsigned int	 rate_bound,
                           bool	 fixed,
                           int	     CSPS,
                           bool	 audio_lock,
                           bool	 video_lock,
                           vector<MuxStream *> &streams
        );

    inline int Open() { return output_strm.Open(); }
    inline void Close() { output_strm.Close(); }
    inline void RawWrite(uint8_t *data, unsigned int len)
        {
            return output_strm.Write( data, len );
        }
    inline void NextSegment() { output_strm.NextSegment(); }
    bool SegmentLimReached();


private:
    static void 
    BufferDtsPtsMpeg1ScrTimecode (clockticks    timecode,
                                  uint8_t  marker,
                                  uint8_t *&buffer);
    static void BufferMpeg2ScrTimecode( clockticks    timecode,
                                        uint8_t *&buffer);
    void BufferPaddingPacket( int padding,
                              uint8_t *&buffer );
private:
    OutputStream &output_strm; 
    unsigned int mpeg_version;
    unsigned int sector_size;
    off_t max_segment_size;
    uint8_t *sector_buf;
};
#endif // __SYSTEMS_HH__


/* 
 * Local variables:
 *  c-file-style: "stroustrup"
 *  tab-width: 4
 *  indent-tabs-mode: nil
 * End:
 */