spatscal.c
资源名称:mpeg2编解码.zip [点击查看]
上传用户:hkgotone
上传日期:2013-02-17
资源大小:293k
文件大小:9k
源码类别:
Windows Mobile
开发平台:
C/C++
- #include <stdio.h>
- #include "config.h"
- #include "global.h"
- /* private prototypes */
- static void Read_Lower_Layer_Component_Framewise _ANSI_ARGS_((int comp, int lw, int lh));
- static void Read_Lower_Layer_Component_Fieldwise _ANSI_ARGS_((int comp, int lw, int lh));
- static void Make_Spatial_Prediction_Frame _ANSI_ARGS_((int progressive_frame,
- int llprogressive_frame, unsigned char *fld0, unsigned char *fld1,
- short *tmp, unsigned char *dst, int llx0, int lly0, int llw, int llh,
- int horizontal_size, int vertical_size, int vm, int vn, int hm, int hn,
- int aperture));
- static void Deinterlace _ANSI_ARGS_((unsigned char *fld0, unsigned char *fld1,
- int j0, int lx, int ly, int aperture));
- static void Subsample_Vertical _ANSI_ARGS_((unsigned char *s, short *d,
- int lx, int lys, int lyd, int m, int n, int j0, int dj));
- static void Subsample_Horizontal _ANSI_ARGS_((short *s, unsigned char *d,
- int x0, int lx, int lxs, int lxd, int ly, int m, int n));
- /* get reference frame */
- void Spatial_Prediction()
- {
- if(Frame_Store_Flag)
- {
- Read_Lower_Layer_Component_Framewise(0,lower_layer_prediction_horizontal_size,
- lower_layer_prediction_vertical_size); /* Y */
- Read_Lower_Layer_Component_Framewise(1,lower_layer_prediction_horizontal_size>>1,
- lower_layer_prediction_vertical_size>>1); /* Cb ("U") */
- Read_Lower_Layer_Component_Framewise(2,lower_layer_prediction_horizontal_size>>1,
- lower_layer_prediction_vertical_size>>1); /* Cr ("V") */
- }
- else
- {
- Read_Lower_Layer_Component_Fieldwise(0,lower_layer_prediction_horizontal_size,
- lower_layer_prediction_vertical_size); /* Y */
- Read_Lower_Layer_Component_Fieldwise(1,lower_layer_prediction_horizontal_size>>1,
- lower_layer_prediction_vertical_size>>1); /* Cb ("U") */
- Read_Lower_Layer_Component_Fieldwise(2,lower_layer_prediction_horizontal_size>>1,
- lower_layer_prediction_vertical_size>>1); /* Cr ("V") */
- }
- Make_Spatial_Prediction_Frame /* Y */
- (progressive_frame,lower_layer_progressive_frame,llframe0[0],llframe1[0],
- lltmp,current_frame[0],lower_layer_horizontal_offset,
- lower_layer_vertical_offset,
- lower_layer_prediction_horizontal_size,
- lower_layer_prediction_vertical_size,
- horizontal_size,vertical_size,vertical_subsampling_factor_m,
- vertical_subsampling_factor_n,horizontal_subsampling_factor_m,
- horizontal_subsampling_factor_n,
- picture_structure!=FRAME_PICTURE); /* this changed from CD to DIS */
- Make_Spatial_Prediction_Frame /* Cb */
- (progressive_frame,lower_layer_progressive_frame,llframe0[1],llframe1[1],
- lltmp,current_frame[1],lower_layer_horizontal_offset/2,
- lower_layer_vertical_offset/2,
- lower_layer_prediction_horizontal_size>>1,
- lower_layer_prediction_vertical_size>>1,
- horizontal_size>>1,vertical_size>>1,vertical_subsampling_factor_m,
- vertical_subsampling_factor_n,horizontal_subsampling_factor_m,
- horizontal_subsampling_factor_n,1);
- Make_Spatial_Prediction_Frame /* Cr */
- (progressive_frame,lower_layer_progressive_frame,llframe0[2],llframe1[2],
- lltmp,current_frame[2],lower_layer_horizontal_offset/2,
- lower_layer_vertical_offset/2,
- lower_layer_prediction_horizontal_size>>1,
- lower_layer_prediction_vertical_size>>1,
- horizontal_size>>1,vertical_size>>1,vertical_subsampling_factor_m,
- vertical_subsampling_factor_n,horizontal_subsampling_factor_m,
- horizontal_subsampling_factor_n,1);
- }
- static void Read_Lower_Layer_Component_Framewise(comp,lw,lh)
- int comp;
- int lw, lh;
- {
- FILE *fd;
- char fname[256];
- char ext[3][3] = {".Y",".U",".V"};
- /* char *ext = {".Y",".U",".V"}; */
- int i,j;
- sprintf(fname,Lower_Layer_Picture_Filename,True_Framenum);
- strcat(fname,ext[comp]);
- #ifdef VERBOSE
- if (Verbose_Flag>1)
- printf("reading %sn",fname);
- #endif VERBOSE
- fd=fopen(fname,"rb");
- if (fd==NULL) exit(-1);
- for (j=0; j<lh; j++) {
- for (i=0; i<lw; i++)
- llframe0[comp][lw*j+i]=getc(fd);
- if (! lower_layer_progressive_frame) {
- j++;
- for (i=0; i<lw; i++)
- llframe1[comp][lw*j+i]=getc(fd);
- }
- }
- fclose(fd);
- }
- static void Read_Lower_Layer_Component_Fieldwise(comp,lw,lh)
- int comp;
- int lw, lh;
- {
- FILE *fd;
- char fname[256];
- char ext[3][3] = {".Y",".U",".V"};
- /* char *ext = {".Y",".U",".V"}; */
- int i,j;
- sprintf(fname,Lower_Layer_Picture_Filename,True_Framenum,lower_layer_progressive_frame ? 'f':'a');
- strcat(fname,ext[comp]);
- #ifdef VERBOSE
- if (Verbose_Flag>1)
- printf("reading %sn",fname);
- #endif VERBOSE
- fd=fopen(fname,"rb");
- if (fd==NULL) exit(-1);
- for (j=0; j<lh; j+=lower_layer_progressive_frame?1:2)
- for (i=0; i<lw; i++)
- llframe0[comp][lw*j+i]=getc(fd);
- fclose(fd);
- if (! lower_layer_progressive_frame) {
- sprintf(fname,Lower_Layer_Picture_Filename,True_Framenum,'b');
- strcat(fname,ext[comp]);
- #ifdef VERBOSE
- if (Verbose_Flag>1)
- printf("reading %sn",fname);
- #endif VERBOSE
- fd=fopen(fname,"rb");
- if (fd==NULL) exit(-1);
- for (j=1; j<lh; j+=2)
- for (i=0; i<lw; i++)
- llframe1[comp][lw*j+i]=getc(fd);
- fclose(fd);
- }
- }
- /* form spatial prediction */
- static void Make_Spatial_Prediction_Frame(progressive_frame,
- llprogressive_frame,fld0,fld1,tmp,dst,llx0,lly0,llw,llh,horizontal_size,
- vertical_size,vm,vn,hm,hn,aperture)
- int progressive_frame,llprogressive_frame;
- unsigned char *fld0,*fld1;
- short *tmp;
- unsigned char *dst;
- int llx0,lly0,llw,llh,horizontal_size,vertical_size,vm,vn,hm,hn,aperture;
- {
- int w, h, x0, llw2, llh2;
- llw2 = (llw*hn)/hm;
- llh2 = (llh*vn)/vm;
- if (llprogressive_frame)
- {
- /* progressive -> progressive / interlaced */
- Subsample_Vertical(fld0,tmp,llw,llh,llh2,vm,vn,0,1);
- }
- else if (progressive_frame)
- {
- /* interlaced -> progressive */
- if (lower_layer_deinterlaced_field_select)
- {
- Deinterlace(fld1,fld0,0,llw,llh,aperture);
- Subsample_Vertical(fld1,tmp,llw,llh,llh2,vm,vn,0,1);
- }
- else
- {
- Deinterlace(fld0,fld1,1,llw,llh,aperture);
- Subsample_Vertical(fld0,tmp,llw,llh,llh2,vm,vn,0,1);
- }
- }
- else
- {
- /* interlaced -> interlaced */
- Deinterlace(fld0,fld1,1,llw,llh,aperture);
- Deinterlace(fld1,fld0,0,llw,llh,aperture);
- Subsample_Vertical(fld0,tmp,llw,llh,llh2,vm,vn,0,2);
- Subsample_Vertical(fld1,tmp,llw,llh,llh2,vm,vn,1,2);
- }
- /* vertical limits */
- if (lly0<0)
- {
- tmp-= llw*lly0;
- llh2+= lly0;
- if (llh2<0)
- llh2 = 0;
- h = (vertical_size<llh2) ? vertical_size : llh2;
- }
- else
- {
- dst+= horizontal_size*lly0;
- h= vertical_size - lly0;
- if (h>llh2)
- h = llh2;
- }
- /* horizontal limits */
- if (llx0<0)
- {
- x0 = -llx0;
- llw2+= llx0;
- if (llw2<0)
- llw2 = 0;
- w = (horizontal_size<llw2) ? horizontal_size : llw2;
- }
- else
- {
- dst+= llx0;
- x0 = 0;
- w = horizontal_size - llx0;
- if (w>llw2)
- w = llw2;
- }
- Subsample_Horizontal(tmp,dst,x0,w,llw,horizontal_size,h,hm,hn);
- }
- /* deinterlace one field (interpolate opposite parity samples)
- *
- * deinterlacing is done in-place: if j0=1, fld0 contains the input field in
- * its even lines and the odd lines are interpolated by this routine
- * if j0=0, the input field is in the odd lines and the even lines are
- * interpolated
- *
- * fld0: field to be deinterlaced
- * fld1: other field (referenced by the two field aperture filter)
- * j0: 0: interpolate even (top) lines, 1: interpolate odd (bottom) lines
- * lx: width of fld0 and fld1
- * ly: height of the deinterlaced field (has to be even)
- * aperture: 1: use one field aperture filter (two field otherwise)
- */
- static void Deinterlace(fld0,fld1,j0,lx,ly,aperture)
- unsigned char *fld0,*fld1;
- int j0,lx,ly; /* ly has to be even */
- int aperture;
- {
- int i,j,v;
- unsigned char *p0, *p0m1, *p0p1, *p1, *p1m2, *p1p2;
- /* deinterlace one field */
- for (j=j0; j<ly; j+=2)
- {
- p0 = fld0+lx*j;
- p0m1 = (j==0) ? p0+lx : p0-lx;
- p0p1 = (j==ly-1) ? p0-lx : p0+lx;
- if (aperture)
- for (i=0; i<lx; i++)
- p0[i] = (unsigned int)(p0m1[i] + p0p1[i] + 1)>>1;
- else
- {
- p1 = fld1 + lx*j;
- p1m2 = (j<2) ? p1 : p1-2*lx;
- p1p2 = (j>=ly-2) ? p1 : p1+2*lx;
- for (i=0; i<lx; i++)
- {
- v = 8*(p0m1[i]+p0p1[i]) + 2*p1[i] - p1m2[i] - p1p2[i];
- p0[i] = Clip[(v + ((v>=0) ? 8 : 7))>>4];
- }
- }
- }
- }
- /* vertical resampling */
- static void Subsample_Vertical(s,d,lx,lys,lyd,m,n,j0,dj)
- unsigned char *s;
- short *d;
- int lx, lys, lyd, m, n, j0, dj;
- {
- int i, j, c1, c2, jd;
- unsigned char *s1, *s2;
- short *d1;
- for (j=j0; j<lyd; j+=dj)
- {
- d1 = d + lx*j;
- jd = (j*m)/n;
- s1 = s + lx*jd;
- s2 = (jd<lys-1)? s1+lx : s1;
- c2 = (16*((j*m)%n) + (n>>1))/n;
- c1 = 16 - c2;
- for (i=0; i<lx; i++)
- d1[i] = c1*s1[i] + c2*s2[i];
- }
- }
- /* horizontal resampling */
- static void Subsample_Horizontal(s,d,x0,lx,lxs,lxd,ly,m,n)
- short *s;
- unsigned char *d;
- int x0, lx, lxs, lxd, ly, m, n;
- {
- int i, i1, j, id, c1, c2, v;
- short *s1, *s2;
- unsigned char *d1;
- for (i1=0; i1<lx; i1++)
- {
- d1 = d + i1;
- i = x0 + i1;
- id = (i*m)/n;
- s1 = s+id;
- s2 = (id<lxs-1) ? s1+1 : s1;
- c2 = (16*((i*m)%n) + (n>>1))/n;
- c1 = 16 - c2;
- for (j=0; j<ly; j++)
- {
- v = c1*(*s1) + c2*(*s2);
- *d1 = (v + ((v>=0) ? 128 : 127))>>8;
- d1+= lxd;
- s1+= lxs;
- s2+= lxs;
- }
- }
- }