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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1624 | giacomo | 1 | |
| 2 | #include "config.h" |
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| 3 | #include "global.h" |
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| 4 | |||
| 5 | /* private prototypes */ |
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| 6 | static void Read_Lower_Layer_Component_Framewise _ANSI_ARGS_((int comp, int lw, int lh)); |
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| 7 | static void Read_Lower_Layer_Component_Fieldwise _ANSI_ARGS_((int comp, int lw, int lh)); |
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| 8 | static void Make_Spatial_Prediction_Frame _ANSI_ARGS_((int progressive_frame, |
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| 9 | int llprogressive_frame, unsigned char *fld0, unsigned char *fld1, |
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| 10 | short *tmp, unsigned char *dst, int llx0, int lly0, int llw, int llh, |
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| 11 | int horizontal_size, int vertical_size, int vm, int vn, int hm, int hn, |
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| 12 | int aperture)); |
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| 13 | static void Deinterlace _ANSI_ARGS_((unsigned char *fld0, unsigned char *fld1, |
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| 14 | int j0, int lx, int ly, int aperture)); |
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| 15 | static void Subsample_Vertical _ANSI_ARGS_((unsigned char *s, short *d, |
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| 16 | int lx, int lys, int lyd, int m, int n, int j0, int dj)); |
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| 17 | static void Subsample_Horizontal _ANSI_ARGS_((short *s, unsigned char *d, |
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| 18 | int x0, int lx, int lxs, int lxd, int ly, int m, int n)); |
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| 19 | |||
| 20 | |||
| 21 | |||
| 22 | /* get reference frame */ |
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| 23 | void Spatial_Prediction() |
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| 24 | { |
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| 25 | |||
| 26 | if(Frame_Store_Flag) |
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| 27 | { |
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| 28 | Read_Lower_Layer_Component_Framewise(0,lower_layer_prediction_horizontal_size, |
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| 29 | lower_layer_prediction_vertical_size); /* Y */ |
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| 30 | Read_Lower_Layer_Component_Framewise(1,lower_layer_prediction_horizontal_size>>1, |
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| 31 | lower_layer_prediction_vertical_size>>1); /* Cb ("U") */ |
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| 32 | Read_Lower_Layer_Component_Framewise(2,lower_layer_prediction_horizontal_size>>1, |
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| 33 | lower_layer_prediction_vertical_size>>1); /* Cr ("V") */ |
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| 34 | } |
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| 35 | else |
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| 36 | { |
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| 37 | Read_Lower_Layer_Component_Fieldwise(0,lower_layer_prediction_horizontal_size, |
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| 38 | lower_layer_prediction_vertical_size); /* Y */ |
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| 39 | Read_Lower_Layer_Component_Fieldwise(1,lower_layer_prediction_horizontal_size>>1, |
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| 40 | lower_layer_prediction_vertical_size>>1); /* Cb ("U") */ |
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| 41 | Read_Lower_Layer_Component_Fieldwise(2,lower_layer_prediction_horizontal_size>>1, |
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| 42 | lower_layer_prediction_vertical_size>>1); /* Cr ("V") */ |
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| 43 | } |
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| 44 | |||
| 45 | |||
| 46 | Make_Spatial_Prediction_Frame /* Y */ |
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| 47 | (progressive_frame,lower_layer_progressive_frame,llframe0[0],llframe1[0], |
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| 48 | lltmp,current_frame[0],lower_layer_horizontal_offset, |
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| 49 | lower_layer_vertical_offset, |
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| 50 | lower_layer_prediction_horizontal_size, |
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| 51 | lower_layer_prediction_vertical_size, |
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| 52 | horizontal_size,vertical_size,vertical_subsampling_factor_m, |
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| 53 | vertical_subsampling_factor_n,horizontal_subsampling_factor_m, |
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| 54 | horizontal_subsampling_factor_n, |
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| 55 | picture_structure!=FRAME_PICTURE); /* this changed from CD to DIS */ |
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| 56 | |||
| 57 | Make_Spatial_Prediction_Frame /* Cb */ |
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| 58 | (progressive_frame,lower_layer_progressive_frame,llframe0[1],llframe1[1], |
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| 59 | lltmp,current_frame[1],lower_layer_horizontal_offset/2, |
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| 60 | lower_layer_vertical_offset/2, |
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| 61 | lower_layer_prediction_horizontal_size>>1, |
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| 62 | lower_layer_prediction_vertical_size>>1, |
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| 63 | horizontal_size>>1,vertical_size>>1,vertical_subsampling_factor_m, |
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| 64 | vertical_subsampling_factor_n,horizontal_subsampling_factor_m, |
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| 65 | horizontal_subsampling_factor_n,1); |
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| 66 | |||
| 67 | Make_Spatial_Prediction_Frame /* Cr */ |
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| 68 | (progressive_frame,lower_layer_progressive_frame,llframe0[2],llframe1[2], |
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| 69 | lltmp,current_frame[2],lower_layer_horizontal_offset/2, |
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| 70 | lower_layer_vertical_offset/2, |
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| 71 | lower_layer_prediction_horizontal_size>>1, |
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| 72 | lower_layer_prediction_vertical_size>>1, |
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| 73 | horizontal_size>>1,vertical_size>>1,vertical_subsampling_factor_m, |
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| 74 | vertical_subsampling_factor_n,horizontal_subsampling_factor_m, |
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| 75 | horizontal_subsampling_factor_n,1); |
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| 76 | |||
| 77 | } |
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| 78 | |||
| 79 | static void Read_Lower_Layer_Component_Framewise(comp,lw,lh) |
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| 80 | int comp; |
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| 81 | int lw, lh; |
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| 82 | { |
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| 83 | cprintf("Read_Lower_Layer_Component_Framewise\n"); |
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| 84 | } |
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| 85 | |||
| 86 | |||
| 87 | static void Read_Lower_Layer_Component_Fieldwise(comp,lw,lh) |
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| 88 | int comp; |
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| 89 | int lw, lh; |
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| 90 | { |
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| 91 | cprintf("Read_Lower_Layer_Component_Fieldwise\n"); |
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| 92 | } |
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| 93 | |||
| 94 | |||
| 95 | /* form spatial prediction */ |
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| 96 | static void Make_Spatial_Prediction_Frame(progressive_frame, |
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| 97 | llprogressive_frame,fld0,fld1,tmp,dst,llx0,lly0,llw,llh,horizontal_size, |
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| 98 | vertical_size,vm,vn,hm,hn,aperture) |
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| 99 | int progressive_frame,llprogressive_frame; |
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| 100 | unsigned char *fld0,*fld1; |
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| 101 | short *tmp; |
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| 102 | unsigned char *dst; |
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| 103 | int llx0,lly0,llw,llh,horizontal_size,vertical_size,vm,vn,hm,hn,aperture; |
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| 104 | { |
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| 105 | int w, h, x0, llw2, llh2; |
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| 106 | |||
| 107 | llw2 = (llw*hn)/hm; |
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| 108 | llh2 = (llh*vn)/vm; |
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| 109 | |||
| 110 | if (llprogressive_frame) |
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| 111 | { |
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| 112 | /* progressive -> progressive / interlaced */ |
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| 113 | Subsample_Vertical(fld0,tmp,llw,llh,llh2,vm,vn,0,1); |
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| 114 | } |
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| 115 | else if (progressive_frame) |
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| 116 | { |
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| 117 | /* interlaced -> progressive */ |
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| 118 | if (lower_layer_deinterlaced_field_select) |
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| 119 | { |
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| 120 | Deinterlace(fld1,fld0,0,llw,llh,aperture); |
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| 121 | Subsample_Vertical(fld1,tmp,llw,llh,llh2,vm,vn,0,1); |
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| 122 | } |
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| 123 | else |
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| 124 | { |
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| 125 | Deinterlace(fld0,fld1,1,llw,llh,aperture); |
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| 126 | Subsample_Vertical(fld0,tmp,llw,llh,llh2,vm,vn,0,1); |
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| 127 | } |
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| 128 | } |
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| 129 | else |
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| 130 | { |
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| 131 | /* interlaced -> interlaced */ |
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| 132 | Deinterlace(fld0,fld1,1,llw,llh,aperture); |
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| 133 | Deinterlace(fld1,fld0,0,llw,llh,aperture); |
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| 134 | Subsample_Vertical(fld0,tmp,llw,llh,llh2,vm,vn,0,2); |
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| 135 | Subsample_Vertical(fld1,tmp,llw,llh,llh2,vm,vn,1,2); |
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| 136 | } |
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| 137 | |||
| 138 | /* vertical limits */ |
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| 139 | if (lly0<0) |
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| 140 | { |
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| 141 | tmp-= llw*lly0; |
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| 142 | llh2+= lly0; |
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| 143 | if (llh2<0) |
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| 144 | llh2 = 0; |
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| 145 | h = (vertical_size<llh2) ? vertical_size : llh2; |
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| 146 | } |
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| 147 | else |
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| 148 | { |
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| 149 | dst+= horizontal_size*lly0; |
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| 150 | h= vertical_size - lly0; |
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| 151 | if (h>llh2) |
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| 152 | h = llh2; |
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| 153 | } |
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| 154 | |||
| 155 | /* horizontal limits */ |
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| 156 | if (llx0<0) |
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| 157 | { |
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| 158 | x0 = -llx0; |
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| 159 | llw2+= llx0; |
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| 160 | if (llw2<0) |
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| 161 | llw2 = 0; |
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| 162 | w = (horizontal_size<llw2) ? horizontal_size : llw2; |
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| 163 | } |
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| 164 | else |
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| 165 | { |
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| 166 | dst+= llx0; |
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| 167 | x0 = 0; |
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| 168 | w = horizontal_size - llx0; |
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| 169 | if (w>llw2) |
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| 170 | w = llw2; |
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| 171 | } |
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| 172 | |||
| 173 | Subsample_Horizontal(tmp,dst,x0,w,llw,horizontal_size,h,hm,hn); |
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| 174 | } |
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| 175 | |||
| 176 | /* deinterlace one field (interpolate opposite parity samples) |
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| 177 | * |
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| 178 | * deinterlacing is done in-place: if j0=1, fld0 contains the input field in |
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| 179 | * its even lines and the odd lines are interpolated by this routine |
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| 180 | * if j0=0, the input field is in the odd lines and the even lines are |
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| 181 | * interpolated |
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| 182 | * |
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| 183 | * fld0: field to be deinterlaced |
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| 184 | * fld1: other field (referenced by the two field aperture filter) |
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| 185 | * j0: 0: interpolate even (top) lines, 1: interpolate odd (bottom) lines |
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| 186 | * lx: width of fld0 and fld1 |
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| 187 | * ly: height of the deinterlaced field (has to be even) |
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| 188 | * aperture: 1: use one field aperture filter (two field otherwise) |
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| 189 | */ |
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| 190 | static void Deinterlace(fld0,fld1,j0,lx,ly,aperture) |
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| 191 | unsigned char *fld0,*fld1; |
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| 192 | int j0,lx,ly; /* ly has to be even */ |
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| 193 | int aperture; |
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| 194 | { |
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| 195 | int i,j,v; |
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| 196 | unsigned char *p0, *p0m1, *p0p1, *p1, *p1m2, *p1p2; |
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| 197 | |||
| 198 | /* deinterlace one field */ |
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| 199 | for (j=j0; j<ly; j+=2) |
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| 200 | { |
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| 201 | p0 = fld0+lx*j; |
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| 202 | p0m1 = (j==0) ? p0+lx : p0-lx; |
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| 203 | p0p1 = (j==ly-1) ? p0-lx : p0+lx; |
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| 204 | |||
| 205 | if (aperture) |
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| 206 | for (i=0; i<lx; i++) |
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| 207 | p0[i] = (unsigned int)(p0m1[i] + p0p1[i] + 1)>>1; |
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| 208 | else |
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| 209 | { |
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| 210 | p1 = fld1 + lx*j; |
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| 211 | p1m2 = (j<2) ? p1 : p1-2*lx; |
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| 212 | p1p2 = (j>=ly-2) ? p1 : p1+2*lx; |
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| 213 | for (i=0; i<lx; i++) |
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| 214 | { |
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| 215 | v = 8*(p0m1[i]+p0p1[i]) + 2*p1[i] - p1m2[i] - p1p2[i]; |
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| 216 | p0[i] = Clip[(v + ((v>=0) ? 8 : 7))>>4]; |
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| 217 | } |
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| 218 | } |
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| 219 | } |
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| 220 | } |
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| 221 | |||
| 222 | /* vertical resampling */ |
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| 223 | static void Subsample_Vertical(s,d,lx,lys,lyd,m,n,j0,dj) |
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| 224 | unsigned char *s; |
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| 225 | short *d; |
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| 226 | int lx, lys, lyd, m, n, j0, dj; |
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| 227 | { |
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| 228 | int i, j, c1, c2, jd; |
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| 229 | unsigned char *s1, *s2; |
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| 230 | short *d1; |
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| 231 | |||
| 232 | for (j=j0; j<lyd; j+=dj) |
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| 233 | { |
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| 234 | d1 = d + lx*j; |
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| 235 | jd = (j*m)/n; |
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| 236 | s1 = s + lx*jd; |
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| 237 | s2 = (jd<lys-1)? s1+lx : s1; |
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| 238 | c2 = (16*((j*m)%n) + (n>>1))/n; |
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| 239 | c1 = 16 - c2; |
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| 240 | for (i=0; i<lx; i++) |
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| 241 | d1[i] = c1*s1[i] + c2*s2[i]; |
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| 242 | } |
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| 243 | } |
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| 244 | |||
| 245 | /* horizontal resampling */ |
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| 246 | static void Subsample_Horizontal(s,d,x0,lx,lxs,lxd,ly,m,n) |
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| 247 | short *s; |
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| 248 | unsigned char *d; |
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| 249 | int x0, lx, lxs, lxd, ly, m, n; |
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| 250 | { |
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| 251 | int i, i1, j, id, c1, c2, v; |
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| 252 | short *s1, *s2; |
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| 253 | unsigned char *d1; |
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| 254 | |||
| 255 | for (i1=0; i1<lx; i1++) |
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| 256 | { |
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| 257 | d1 = d + i1; |
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| 258 | i = x0 + i1; |
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| 259 | id = (i*m)/n; |
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| 260 | s1 = s+id; |
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| 261 | s2 = (id<lxs-1) ? s1+1 : s1; |
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| 262 | c2 = (16*((i*m)%n) + (n>>1))/n; |
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| 263 | c1 = 16 - c2; |
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| 264 | for (j=0; j<ly; j++) |
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| 265 | { |
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| 266 | v = c1*(*s1) + c2*(*s2); |
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| 267 | *d1 = (v + ((v>=0) ? 128 : 127))>>8; |
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| 268 | d1+= lxd; |
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| 269 | s1+= lxs; |
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| 270 | s2+= lxs; |
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| 271 | } |
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| 272 | } |
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| 273 | } |
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| 274 | |||
| 275 |