decoder.h

一个用于智能手机的多媒体库适合S60 WinCE的跨平台开发库

/*****************************************************************************
 *
 *  XVID MPEG-4 VIDEO CODEC
 *  - Decoder related header -
 *
 *  Copyright(C) 2002-2003 Peter Ross <[e-mail]>
 *
 *  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
 *
 * $Id: decoder.h,v 1.1.1.1 2005/07/13 14:36:13 jeanlf Exp $
 *
 ****************************************************************************/

#ifndef _DECODER_H_
#define _DECODER_H_

#include "xvid.h"
#include "portab.h"
#include "global.h"
#include "image.h"
#include "vlc_codes.h"
#include "Interpolate8x8.h"

/*****************************************************************************
 * Structures
 ****************************************************************************/

/* complexity estimation toggles */
struct ESTIMATION{
   int method;

   int opaque;
   int transparent;
   int intra_cae;
   int inter_cae;
   int no_update;
   int upsampling;

   int intra_blocks;
   int inter_blocks;
   int inter4v_blocks;
   int gmc_blocks;
   int not_coded_blocks;

   int dct_coefs;
   int dct_lines;
   int vlc_symbols;
   int vlc_bits;

   int apm;
   int npm;
   int interpolate_mc_q;
   int forw_back_mc_q;
   int halfpel2;
   int halfpel4;

   int sadct;
   int quarterpel;

   ESTIMATION(){
      MemSet(this, 0, sizeof(ESTIMATION));
   }
};

//----------------------------

struct S_decoder{
private:
#ifdef PROFILE
   mutable C_profiler &prof;
#endif

   int Resize();

//----------------------------
   void SetEdges(IMAGE &img) const;

//----------------------------
   void I_Frame(Bitstream * bs, bool reduced_resolution, int quant, int intra_dc_threshold);
   void P_Frame(Bitstream * bs, int rounding, bool reduced_resolution, int quant, int fcode, int intra_dc_threshold, const WARPPOINTS *const gmc_warp);
   void MBIntra(MACROBLOCK *pMB, dword x_pos, dword y_pos, dword acpred_flag, dword cbp,
      Bitstream *bs, dword quant, dword intra_dc_threshold, dword bound, bool reduced_resolution);

   void mb_decode(const dword cbp, Bitstream * bs, byte * pY_Cur, byte * pU_Cur, byte * pV_Cur, bool reduced_resolution, const MACROBLOCK * pMB);

   void DecodeInterMacroBlock(const MACROBLOCK *pMB, dword x_pos, dword y_pos, dword cbp, Bitstream *bs,
      bool rounding, bool reduced_resolution, int ref);

   void mbgmc(MACROBLOCK *pMB, dword x_pos, dword y_pos, dword fcode, dword cbp, Bitstream *bs, bool rounding);

   void BFrameInterpolateMBInter(const IMAGE &forward, const IMAGE &backward, const MACROBLOCK *pMB, dword x_pos, dword y_pos, Bitstream *bs, int direct);

   void B_Frame(Bitstream * bs, int quant, int fcode_forward, int fcode_backward);
   void GetMotionVector(Bitstream *bs, int x, int y, int k, VECTOR *ret_mv, int fcode, int bound);
   //void Output(IMAGE *img, xvid_dec_frame_t *frame, xvid_dec_stats_t *stats, int coding_type);

   int read_video_packet_header(Bitstream *bs, const int addbits, int *quant, int *fcode_forward, int *fcode_backward, int *intra_dc_threshold);
   void read_vol_complexity_estimation_header(Bitstream * bs);
   int BitstreamReadHeaders(Bitstream * bs, bool &rounding, bool *reduced_resolution, dword *quant, dword *fcode_forward,
      dword *fcode_backward, dword *intra_dc_threshold, WARPPOINTS *gmc_warp);
   void read_vop_complexity_estimation_header(Bitstream * bs, int coding_type);

   int get_coeff(Bitstream *bs, int *run, int *last, int intra, int short_video_header);
   void get_intra_block(Bitstream * bs, int *block, int direction, int coeff);
   void get_inter_block(Bitstream * bs, int *block, int direction);

   void idct_int32_init();
   void InverseDiscreteCosineTransform(int *block) const;

   friend int decoder_create(xvid_dec_create_t *create);

   int Init(xvid_dec_create_t *create);

#ifdef PROFILE
   void interpolate8x8_quarterpel(byte *cur, byte *refn, byte *refh, byte *refv, byte *refhv, dword x, dword y, int dx, int dy, dword stride, bool rounding){
      ::interpolate8x8_quarterpel(cur, refn, refh, refv, refhv, x, y, dx, dy, stride, rounding);
   }
   void interpolate16x16_switch(byte *cur, const byte *refn, dword x, dword y, int dx, int dy, dword stride, bool rounding){
	   interpolate8x8_switch(cur, refn, x,   y,   dx, dy, stride, rounding);
	   interpolate8x8_switch(cur, refn, x+8, y,   dx, dy, stride, rounding);
	   interpolate8x8_switch(cur, refn, x,   y+8, dx, dy, stride, rounding);
	   interpolate8x8_switch(cur, refn, x+8, y+8, dx, dy, stride, rounding);
   }
   void interpolate8x8_switch(byte *cur, const byte *refn, dword x, dword y, int dx, int dy, dword stride, bool rounding){
      const byte *src = refn + ((y + (dy>>1)) * stride + x + (dx>>1));
      byte *dst = cur + (y * stride + x);

      int code = ((dx & 1) << 1) + (dy & 1);
      //PROF_S(PROF_4+MIN(3, code));
      switch(code){
      case 0:
         transfer8x8_copy(dst, src, stride);
         break;
      case 1:
         interpolate8x8_halfpel_v(dst, src, stride, rounding);
         break;
      case 2:
         interpolate8x8_halfpel_h(dst, src, stride, rounding);
         break;
      default:
         interpolate8x8_halfpel_hv(dst, src, stride, rounding);
         break;
      }
      //PROF_E(PROF_4+MIN(3, code));
   }
#endif
public:
   S_decoder(xvid_dec_create_t *create);
   ~S_decoder();
                                //vol bitstream
   int time_inc_resolution;
   int fixed_time_inc;
   dword time_inc_bits;

   dword shape;
   dword quant_bits;
   dword quant_type;
   dword *mpeg_quant_matrices;
   int quarterpel;
   int complexity_estimation_disable;
   ESTIMATION estimation;

   dword top_field_first;
   dword alternate_vertical_scan;

   int aspect_ratio;
   int par_width;
   int par_height;

   int sprite_enable;
   int sprite_warping_points;
   int sprite_warping_accuracy;
   int sprite_brightness_change;

   bool interlacing;
   bool newpred_enable;
   bool reduced_resolution_enable;

   /* The bitstream version if it's a XviD stream */
   int bs_version;

   /* image */

   dword width;
   dword height;
   dword edged_width;
   dword edged_height;

   IMAGE cur;
   IMAGE refn[2];          /* 0   -- last I or P VOP */

                        /* 1   -- first I or P */
   IMAGE tmp;     /* bframe interpolation, and post processing tmp buffer */
   IMAGE qtmp;    /* quarter pel tmp buffer */

   /* macroblock */

   dword mb_width;
   dword mb_height;
   MACROBLOCK *mbs;

                                //for B-frame & low_delay==0
                                 // XXX: should move frame based stuff into a DECODER_FRAMEINFO struct
   MACROBLOCK *last_mbs;         /* last MB */
   int last_coding_type;           /* last coding type value */
   int frames;            /* total frame number */
   VECTOR p_fmv, p_bmv;    /* pred forward & backward motion vector */
   int64_t time;           /* for record time */
   int64_t time_base;
   int64_t last_time_base;
   int64_t last_non_b_time;
   dword time_pp;
   dword time_bp;
   bool fixed_dimensions;
   bool scalability;
   bool low_delay;            //low_delay flage (1 means no B_VOP)
   bool low_delay_default;    //default value for low_delay flag
   bool last_reduced_resolution; //last reduced_resolution value
   bool packed_mode;          //bframes packed bitstream? (1 = yes)

                              //for GMC: central place for all parameters

   IMAGE gmc;     /* gmc tmp buffer, remove for blockbased compensation */
   GMC_DATA gmc_data;
   NEW_GMC_DATA new_gmc_data;

   /*
#ifdef XVID_CSP_SLICE
   xvid_image_t* out_frm;                //This is used for slice rendering
#endif
   */

   struct REVERSE_EVENT{
      byte len;
      EVENT event;
   };
                              //decoding tables
   REVERSE_EVENT DCT3D[2][4096];
   VLC coeff_VLC[2][2][64][64];

   typedef int t_clip_val;
   t_clip_val iclip[1024];            //clipping table

   void init_vlc_tables();
   int Decode(xvid_dec_frame_t * frame, xvid_dec_stats_t * stats);
};

/*****************************************************************************
 * Decoder prototypes
 ****************************************************************************/

void init_decoder(dword cpu_flags);

int decoder_create(xvid_dec_create_t * param);


#endif