videostrm.hpp

来自「Motion JPEG编解码器源代码」· HPP 代码 · 共 154 行

/*
 *  videostrm.hpp:  Video stream elementary input stream
 *
 *  Copyright (C) 2001 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 __VIDEOSTRM_H__
#define __VIDEOSTRM_H__

#include "inputstrm.hpp"
#include "interact.hpp"
#include "stream_params.hpp"

class VideoStream : public ElementaryStream
{
public:
	VideoStream(IBitStream &ibs, VideoParams *parms, 
                Multiplexor &into);
	void Init( const int stream_num );

    static bool Probe(IBitStream &bs );

	void Close();

    inline int DecoderOrder() { return au->dorder; }
	inline int AUType()	{ return au->type; }

    bool SeqEndRunOut();

    const AUnit *NextIFrame();


	inline int NextAUType()
		{
			AUnit *p_au = Lookahead();
			if( p_au != 0 )
				return p_au->type;
			else
				return NOFRAME;
		}


	virtual unsigned int NominalBitRate() 
		{ 
			return bit_rate * 400;
		}

    virtual void OutputGOPControlSector();
	bool RunOutComplete();
	virtual bool MuxPossible(clockticks currentSCR);
    virtual void AUMuxed( bool first_in_sector ) ;

    void SetMaxStdBufferDelay( unsigned int demux_rate );
	void OutputSector();


protected:
    static const unsigned int MAX_GOP_LENGTH = 128;
	void OutputSeqhdrInfo();
	virtual void FillAUbuffer(unsigned int frames_to_buffer);
	virtual void NextDTSPTS(  );
	void ScanFirstSeqHeader();
    uint8_t NewAUTimestamps( int AUtype );
    bool NewAUBuffers( int AUtype );

    unsigned int ExcludeNextIFramePayload();

public:	
    unsigned int num_sequence 	;
    unsigned int num_seq_end	;
    unsigned int num_pictures 	;
    unsigned int num_groups 	;
    unsigned int num_frames[4] 	;
         int64_t avg_frames[4]  ;
    
    unsigned int horizontal_size;
    unsigned int vertical_size 	;
     unsigned int aspect_ratio	;
    unsigned int picture_rate	;
    unsigned int bit_rate 	;
    unsigned int vbv_buffer_size;
    unsigned int CSPF 		;
    double secs_per_frame;

	
	bool dtspts_for_all_au;     // Ensure every AU has a timestamp 
                                // (no two AU can start in one sector)
    bool gop_control_packet;

protected:


	/* State variables for scanning source bit-stream */
    AUnit access_unit;
	int fields_presented;
    int group_start_pic;
	int group_start_field;
    int group_start_SCR;
    int temporal_reference;
    unsigned int pict_struct;
	int pulldown_32;
	int repeat_first_field;
	int prev_temp_ref;
    int ref_present;
    int prev_ref_present;
    double frame_rate;
	double max_bits_persec;
	int AU_pict_data;
	int AU_hdr;
    clockticks max_STD_buffer_delay;
    VideoParams *parms;
}; 	

//
// DVD's generate control sectors for each GOP...
//

class DVDVideoStream : public VideoStream
{
public:
	DVDVideoStream(IBitStream &ibs,VideoParams *parms,Multiplexor &into) : 
        VideoStream( ibs, parms, into )
        {
            gop_control_packet = true;
        }
    void OutputGOPControlSector();  
};

#endif // __INPUTSTRM_H__

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