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21 *@brief IntraX8 frame subdecoder image manipulation routines
24 #include "intrax8dsp.h"
25 #include "libavutil/common.h"
28 area positions, #3 is 1 pixel only, other are 8 pixels
31 - -+--------+--------+
47 #define area5 (8+8+1+8)
48 #define area6 (8+8+1+16)
51 Collect statistics and prepare the edge pixels required by the other spatial compensation functions.
53 * @param src pointer to the beginning of the processed block
54 * @param dst pointer to emu_edge, edge pixels are stored the way other compensation routines do.
55 * @param linesize byte offset between 2 vertical pixels in the source image
56 * @param range pointer to the variable where the edge pixel range is to be stored (max-min values)
57 * @param psum pointer to the variable where the edge pixel sum is to be stored
58 * @param edges Informs this routine that the block is on an image border, so it has to interpolate the missing edge pixels.
59 and some of the edge pixels should be interpolated, the flag has the following meaning:
60 1 - mb_x==0 - first block in the row, interpolate area #1,#2,#3;
61 2 - mb_y==0 - first row, interpolate area #3,#4,#5,#6;
62 note: 1|2 - mb_x==mb_y==0 - first block, use 0x80 value for all areas;
63 4 - mb_x>= (mb_width-1) last block in the row, interpolate area #5;
65 static void x8_setup_spatial_compensation(uint8_t *src, uint8_t *dst, int linesize,
66 int * range, int * psum, int edges){
76 memset(dst,0x80,16+1+16+8);
77 //this triggers flat_dc for sure.
78 //flat_dc avoids all (other) prediction modes, but requires dc_level decoding.
87 if(!(edges&1)){//(mb_x!=0)//there is previous block on this row
88 ptr=src-1;//left column, area 2
90 c=*(ptr-1);//area1, same mb as area2, no need to check
95 min_pix=FFMIN(min_pix,c);
96 max_pix=FFMAX(max_pix,c);
103 if(!(edges&2)){ //(mb_y!=0)//there is row above
104 ptr=src-linesize;//top line
108 min_pix=FFMIN(min_pix, c);
109 max_pix=FFMAX(max_pix, c);
111 if(edges&4){//last block on the row?
112 memset(dst+area5,c,8);//set with last pixel fr
113 memcpy(dst+area4, ptr, 8);
115 memcpy(dst+area4, ptr, 16);//both area4 and 5
117 memcpy(dst+area6, ptr-linesize, 8);//area6 always present in the above block
119 //now calculate the stuff we need
120 if(edges&3){//mb_x==0 || mb_y==0){
122 if(edges&1){ //(mb_x==0) {//implies mb_y!=0
123 memset(dst+area1,avg,8+8+1);//areas 1,2 and 3 are averaged
124 }else{//implies y==0 x!=0
125 memset(dst+area3,avg, 1+16+8);//areas 3, 4,5,6
129 uint8_t c=*(src-1-linesize);//the edge pixel, in the top line and left column
132 //edge pixel is not part of min/max
134 (*range) = max_pix - min_pix;
135 sum += *(dst+area5) + *(dst+area5+1);
140 static const uint16_t zero_prediction_weights[64*2] = {
141 640, 640, 669, 480, 708, 354, 748, 257, 792, 198, 760, 143, 808, 101, 772, 72,
142 480, 669, 537, 537, 598, 416, 661, 316, 719, 250, 707, 185, 768, 134, 745, 97,
143 354, 708, 416, 598, 488, 488, 564, 388, 634, 317, 642, 241, 716, 179, 706, 132,
144 257, 748, 316, 661, 388, 564, 469, 469, 543, 395, 571, 311, 655, 238, 660, 180,
145 198, 792, 250, 719, 317, 634, 395, 543, 469, 469, 507, 380, 597, 299, 616, 231,
146 161, 855, 206, 788, 266, 710, 340, 623, 411, 548, 455, 455, 548, 366, 576, 288,
147 122, 972, 159, 914, 211, 842, 276, 758, 341, 682, 389, 584, 483, 483, 520, 390,
148 110, 1172, 144, 1107, 193, 1028, 254, 932, 317, 846, 366, 731, 458, 611, 499, 499
151 static void spatial_compensation_0(uint8_t *src , uint8_t *dst, int linesize){
154 unsigned int p;//power divided by 2
156 uint16_t left_sum[2][8] = { { 0 } };
157 uint16_t top_sum[2][8] = { { 0 } };
163 left_sum[p&1][j]+= a>>(p>>1);
171 top_sum[p&1][j]+= a>>(p>>1);
178 top_sum[p&1][j]+= a>>(p>>1);
185 top_sum[p&1][j]+= a>>(p>>1);
190 top_sum [0][i]+=(top_sum [1][i]*181 + 128 )>>8;//181 is sqrt(2)/2
191 left_sum[0][i]+=(left_sum[1][i]*181 + 128 )>>8;
196 (uint32_t)top_sum [0][x]*zero_prediction_weights[y*16+x*2+0] +
197 (uint32_t)left_sum[0][y]*zero_prediction_weights[y*16+x*2+1] +
204 static void spatial_compensation_1(uint8_t *src , uint8_t *dst, int linesize){
209 dst[x]=src[area4 + FFMIN(2*y+x+2, 15) ];
214 static void spatial_compensation_2(uint8_t *src , uint8_t *dst, int linesize){
219 dst[x]=src[area4 +1+y+x];
224 static void spatial_compensation_3(uint8_t *src , uint8_t *dst, int linesize){
229 dst[x]=src[area4 +((y+1)>>1)+x];
234 static void spatial_compensation_4(uint8_t *src , uint8_t *dst, int linesize){
239 dst[x]=( src[area4+x] + src[area6+x] + 1 )>>1;
244 static void spatial_compensation_5(uint8_t *src , uint8_t *dst, int linesize){
250 dst[x]=src[area2+9+2*x-y];
252 dst[x]=src[area4 +x-((y+1)>>1)];
258 static void spatial_compensation_6(uint8_t *src , uint8_t *dst, int linesize){
263 dst[x]=src[area3+x-y];
268 static void spatial_compensation_7(uint8_t *src , uint8_t *dst, int linesize){
274 dst[x]=( src[area3-1+x-2*y] + src[area3+x-2*y] + 1)>>1;
276 dst[x]=src[area2+8-y +(x>>1)];
282 static void spatial_compensation_8(uint8_t *src , uint8_t *dst, int linesize){
287 dst[x]=( src[area1+7-y] + src[area2+7-y] + 1 )>>1;
292 static void spatial_compensation_9(uint8_t *src , uint8_t *dst, int linesize){
297 dst[x]=src[area2+6-FFMIN(x+y,6)];
302 static void spatial_compensation_10(uint8_t *src , uint8_t *dst, int linesize){
307 dst[x]=(src[area2+7-y]*(8-x)+src[area4+x]*x+4)>>3;
312 static void spatial_compensation_11(uint8_t *src , uint8_t *dst, int linesize){
317 dst[x]=(src[area2+7-y]*y+src[area4+x]*(8-y)+4)>>3;
323 static void x8_loop_filter(uint8_t * ptr, const int a_stride, const int b_stride, int quant){
325 int p0,p1,p2,p3,p4,p5,p6,p7,p8,p9;
326 int ql=(quant+10)>>3;
328 for(i=0; i<8; i++,ptr+=b_stride){
341 (FFABS(p1-p2) <= ql) +
342 (FFABS(p2-p3) <= ql) +
343 (FFABS(p3-p4) <= ql) +
344 (FFABS(p4-p5) <= ql);
345 if(t>0){//You need at least 1 to be able to reach a total score of 6.
347 (FFABS(p5-p6) <= ql) +
348 (FFABS(p6-p7) <= ql) +
349 (FFABS(p7-p8) <= ql) +
350 (FFABS(p8-p9) <= ql) +
351 (FFABS(p0-p1) <= ql);
356 min=FFMIN(min,p3); max=FFMAX(max,p3);
357 min=FFMIN(min,p5); max=FFMAX(max,p5);
358 min=FFMIN(min,p8); max=FFMAX(max,p8);
359 if(max-min<2*quant){//early stop
360 min=FFMIN(min,p2); max=FFMAX(max,p2);
361 min=FFMIN(min,p4); max=FFMAX(max,p4);
362 min=FFMIN(min,p6); max=FFMAX(max,p6);
363 min=FFMIN(min,p7); max=FFMAX(max,p7);
365 ptr[-2*a_stride]=(4*p2 + 3*p3 + 1*p7 + 4)>>3;
366 ptr[-1*a_stride]=(3*p2 + 3*p4 + 2*p7 + 4)>>3;
367 ptr[ 0 ]=(2*p2 + 3*p5 + 3*p7 + 4)>>3;
368 ptr[ 1*a_stride]=(1*p2 + 3*p6 + 4*p7 + 4)>>3;
378 x0 = (2*p3 - 5*p4 + 5*p5 - 2*p6 + 4)>>3;
379 if(FFABS(x0) < quant){
380 x1=(2*p1 - 5*p2 + 5*p3 - 2*p4 + 4)>>3;
381 x2=(2*p5 - 5*p6 + 5*p7 - 2*p8 + 4)>>3;
383 x=FFABS(x0) - FFMIN( FFABS(x1), FFABS(x2) );
386 if( x > 0 && (m^x0) <0){
390 m=(m^sign)-sign;//abs(m)
399 ptr[-1*a_stride] -= x;
407 static void x8_h_loop_filter(uint8_t *src, int stride, int qscale){
408 x8_loop_filter(src, stride, 1, qscale);
411 static void x8_v_loop_filter(uint8_t *src, int stride, int qscale){
412 x8_loop_filter(src, 1, stride, qscale);
415 av_cold void ff_intrax8dsp_init(IntraX8DSPContext *dsp)
417 dsp->h_loop_filter=x8_h_loop_filter;
418 dsp->v_loop_filter=x8_v_loop_filter;
419 dsp->setup_spatial_compensation=x8_setup_spatial_compensation;
420 dsp->spatial_compensation[0]=spatial_compensation_0;
421 dsp->spatial_compensation[1]=spatial_compensation_1;
422 dsp->spatial_compensation[2]=spatial_compensation_2;
423 dsp->spatial_compensation[3]=spatial_compensation_3;
424 dsp->spatial_compensation[4]=spatial_compensation_4;
425 dsp->spatial_compensation[5]=spatial_compensation_5;
426 dsp->spatial_compensation[6]=spatial_compensation_6;
427 dsp->spatial_compensation[7]=spatial_compensation_7;
428 dsp->spatial_compensation[8]=spatial_compensation_8;
429 dsp->spatial_compensation[9]=spatial_compensation_9;
430 dsp->spatial_compensation[10]=spatial_compensation_10;
431 dsp->spatial_compensation[11]=spatial_compensation_11;