git.sesse.net Git - x264/blob - common/ppc/deblock.c

   1 /*****************************************************************************
   2 * deblock.c: Altivec-accelerated deblocking for h264 encoder
   3 *****************************************************************************
   4 * Copyright (C) 2007-2008 Guillaume Poirier <gpoirier@mplayerhq.hu>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
  19 *****************************************************************************/
  20
  21 #if defined SYS_LINUX
  22 #include <altivec.h>
  23 #endif
  24
  25 #include "common/common.h"
  26 #include "ppccommon.h"
  27
  28 #define transpose4x16(r0, r1, r2, r3) {      \
  29     register vec_u8_t r4;                    \
  30     register vec_u8_t r5;                    \
  31     register vec_u8_t r6;                    \
  32     register vec_u8_t r7;                    \
  33                                              \
  34     r4 = vec_mergeh(r0, r2);  /*0, 2 set 0*/ \
  35     r5 = vec_mergel(r0, r2);  /*0, 2 set 1*/ \
  36     r6 = vec_mergeh(r1, r3);  /*1, 3 set 0*/ \
  37     r7 = vec_mergel(r1, r3);  /*1, 3 set 1*/ \
  38                                              \
  39     r0 = vec_mergeh(r4, r6);  /*all set 0*/  \
  40     r1 = vec_mergel(r4, r6);  /*all set 1*/  \
  41     r2 = vec_mergeh(r5, r7);  /*all set 2*/  \
  42     r3 = vec_mergel(r5, r7);  /*all set 3*/  \
  43 }
  44
  45 static inline void write16x4(uint8_t *dst, int dst_stride,
  46                              register vec_u8_t r0, register vec_u8_t r1,
  47                              register vec_u8_t r2, register vec_u8_t r3) {
  48     DECLARE_ALIGNED_16(unsigned char result[64]);
  49     uint32_t *src_int = (uint32_t *)result, *dst_int = (uint32_t *)dst;
  50     int int_dst_stride = dst_stride/4;
  51
  52     vec_st(r0, 0, result);
  53     vec_st(r1, 16, result);
  54     vec_st(r2, 32, result);
  55     vec_st(r3, 48, result);
  56     /* FIXME: there has to be a better way!!!! */
  57     *dst_int = *src_int;
  58     *(dst_int+   int_dst_stride) = *(src_int + 1);
  59     *(dst_int+ 2*int_dst_stride) = *(src_int + 2);
  60     *(dst_int+ 3*int_dst_stride) = *(src_int + 3);
  61     *(dst_int+ 4*int_dst_stride) = *(src_int + 4);
  62     *(dst_int+ 5*int_dst_stride) = *(src_int + 5);
  63     *(dst_int+ 6*int_dst_stride) = *(src_int + 6);
  64     *(dst_int+ 7*int_dst_stride) = *(src_int + 7);
  65     *(dst_int+ 8*int_dst_stride) = *(src_int + 8);
  66     *(dst_int+ 9*int_dst_stride) = *(src_int + 9);
  67     *(dst_int+10*int_dst_stride) = *(src_int + 10);
  68     *(dst_int+11*int_dst_stride) = *(src_int + 11);
  69     *(dst_int+12*int_dst_stride) = *(src_int + 12);
  70     *(dst_int+13*int_dst_stride) = *(src_int + 13);
  71     *(dst_int+14*int_dst_stride) = *(src_int + 14);
  72     *(dst_int+15*int_dst_stride) = *(src_int + 15);
  73 }
  74
  75 /** \brief performs a 6x16 transpose of data in src, and stores it to dst
  76     \todo FIXME: see if we can't spare some vec_lvsl() by them factorizing
  77     out of unaligned_load() */
  78 #define readAndTranspose16x6(src, src_stride, r8, r9, r10, r11, r12, r13) {\
  79     register vec_u8_t r0, r1, r2, r3, r4, r5, r6, r7, r14, r15;\
  80     VEC_LOAD(src,                  r0, 16, vec_u8_t);          \
  81     VEC_LOAD(src +    src_stride,  r1, 16, vec_u8_t);          \
  82     VEC_LOAD(src +  2*src_stride,  r2, 16, vec_u8_t);          \
  83     VEC_LOAD(src +  3*src_stride,  r3, 16, vec_u8_t);          \
  84     VEC_LOAD(src +  4*src_stride,  r4, 16, vec_u8_t);          \
  85     VEC_LOAD(src +  5*src_stride,  r5, 16, vec_u8_t);          \
  86     VEC_LOAD(src +  6*src_stride,  r6, 16, vec_u8_t);          \
  87     VEC_LOAD(src +  7*src_stride,  r7, 16, vec_u8_t);          \
  88     VEC_LOAD(src + 14*src_stride, r14, 16, vec_u8_t);          \
  89     VEC_LOAD(src + 15*src_stride, r15, 16, vec_u8_t);          \
  90                                                                \
  91     VEC_LOAD(src + 8*src_stride,   r8, 16, vec_u8_t);          \
  92     VEC_LOAD(src + 9*src_stride,   r9, 16, vec_u8_t);          \
  93     VEC_LOAD(src + 10*src_stride, r10, 16, vec_u8_t);          \
  94     VEC_LOAD(src + 11*src_stride, r11, 16, vec_u8_t);          \
  95     VEC_LOAD(src + 12*src_stride, r12, 16, vec_u8_t);          \
  96     VEC_LOAD(src + 13*src_stride, r13, 16, vec_u8_t);          \
  97                                                                \
  98     /*Merge first pairs*/                                      \
  99     r0 = vec_mergeh(r0, r8);    /*0, 8*/                       \
 100     r1 = vec_mergeh(r1, r9);    /*1, 9*/                       \
 101     r2 = vec_mergeh(r2, r10);   /*2,10*/                       \
 102     r3 = vec_mergeh(r3, r11);   /*3,11*/                       \
 103     r4 = vec_mergeh(r4, r12);   /*4,12*/                       \
 104     r5 = vec_mergeh(r5, r13);   /*5,13*/                       \
 105     r6 = vec_mergeh(r6, r14);   /*6,14*/                       \
 106     r7 = vec_mergeh(r7, r15);   /*7,15*/                       \
 107                                                                \
 108     /*Merge second pairs*/                                     \
 109     r8  = vec_mergeh(r0, r4);   /*0,4, 8,12 set 0*/            \
 110     r9  = vec_mergel(r0, r4);   /*0,4, 8,12 set 1*/            \
 111     r10 = vec_mergeh(r1, r5);   /*1,5, 9,13 set 0*/            \
 112     r11 = vec_mergel(r1, r5);   /*1,5, 9,13 set 1*/            \
 113     r12 = vec_mergeh(r2, r6);   /*2,6,10,14 set 0*/            \
 114     r13 = vec_mergel(r2, r6);   /*2,6,10,14 set 1*/            \
 115     r14 = vec_mergeh(r3, r7);   /*3,7,11,15 set 0*/            \
 116     r15 = vec_mergel(r3, r7);   /*3,7,11,15 set 1*/            \
 117                                                                \
 118     /*Third merge*/                                            \
 119     r0 = vec_mergeh(r8, r12);   /*0,2,4,6,8,10,12,14 set 0*/   \
 120     r1 = vec_mergel(r8, r12);   /*0,2,4,6,8,10,12,14 set 1*/   \
 121     r2 = vec_mergeh(r9, r13);   /*0,2,4,6,8,10,12,14 set 2*/   \
 122     r4 = vec_mergeh(r10, r14);  /*1,3,5,7,9,11,13,15 set 0*/   \
 123     r5 = vec_mergel(r10, r14);  /*1,3,5,7,9,11,13,15 set 1*/   \
 124     r6 = vec_mergeh(r11, r15);  /*1,3,5,7,9,11,13,15 set 2*/   \
 125     /* Don't need to compute 3 and 7*/                         \
 126                                                                \
 127     /*Final merge*/                                            \
 128     r8  = vec_mergeh(r0, r4);   /*all set 0*/                  \
 129     r9  = vec_mergel(r0, r4);   /*all set 1*/                  \
 130     r10 = vec_mergeh(r1, r5);   /*all set 2*/                  \
 131     r11 = vec_mergel(r1, r5);   /*all set 3*/                  \
 132     r12 = vec_mergeh(r2, r6);   /*all set 4*/                  \
 133     r13 = vec_mergel(r2, r6);   /*all set 5*/                  \
 134     /* Don't need to compute 14 and 15*/                       \
 135                                                                \
 136 }
 137
 138 // out: o = |x-y| < a
 139 static inline vec_u8_t diff_lt_altivec ( register vec_u8_t x,
 140                                          register vec_u8_t y,
 141                                          register vec_u8_t a) {
 142
 143     register vec_u8_t diff = vec_subs(x, y);
 144     register vec_u8_t diffneg = vec_subs(y, x);
 145     register vec_u8_t o = vec_or(diff, diffneg); /* |x-y| */
 146     o = (vec_u8_t)vec_cmplt(o, a);
 147     return o;
 148 }
 149
 150 static inline vec_u8_t h264_deblock_mask ( register vec_u8_t p0,
 151                                            register vec_u8_t p1,
 152                                            register vec_u8_t q0,
 153                                            register vec_u8_t q1,
 154                                            register vec_u8_t alpha,
 155                                            register vec_u8_t beta) {
 156
 157     register vec_u8_t mask;
 158     register vec_u8_t tempmask;
 159
 160     mask = diff_lt_altivec(p0, q0, alpha);
 161     tempmask = diff_lt_altivec(p1, p0, beta);
 162     mask = vec_and(mask, tempmask);
 163     tempmask = diff_lt_altivec(q1, q0, beta);
 164     mask = vec_and(mask, tempmask);
 165
 166     return mask;
 167 }
 168
 169 // out: newp1 = clip((p2 + ((p0 + q0 + 1) >> 1)) >> 1, p1-tc0, p1+tc0)
 170 static inline vec_u8_t h264_deblock_q1(register vec_u8_t p0,
 171                                        register vec_u8_t p1,
 172                                        register vec_u8_t p2,
 173                                        register vec_u8_t q0,
 174                                        register vec_u8_t tc0) {
 175
 176     register vec_u8_t average = vec_avg(p0, q0);
 177     register vec_u8_t temp;
 178     register vec_u8_t uncliped;
 179     register vec_u8_t ones;
 180     register vec_u8_t max;
 181     register vec_u8_t min;
 182     register vec_u8_t newp1;
 183
 184     temp = vec_xor(average, p2);
 185     average = vec_avg(average, p2);     /*avg(p2, avg(p0, q0)) */
 186     ones = vec_splat_u8(1);
 187     temp = vec_and(temp, ones);         /*(p2^avg(p0, q0)) & 1 */
 188     uncliped = vec_subs(average, temp); /*(p2+((p0+q0+1)>>1))>>1 */
 189     max = vec_adds(p1, tc0);
 190     min = vec_subs(p1, tc0);
 191     newp1 = vec_max(min, uncliped);
 192     newp1 = vec_min(max, newp1);
 193     return newp1;
 194 }
 195
 196 #define h264_deblock_p0_q0(p0, p1, q0, q1, tc0masked) {                                         \
 197                                                                                                 \
 198     const vec_u8_t A0v = vec_sl(vec_splat_u8(10), vec_splat_u8(4));                             \
 199                                                                                                 \
 200     register vec_u8_t pq0bit = vec_xor(p0,q0);                                                  \
 201     register vec_u8_t q1minus;                                                                  \
 202     register vec_u8_t p0minus;                                                                  \
 203     register vec_u8_t stage1;                                                                   \
 204     register vec_u8_t stage2;                                                                   \
 205     register vec_u8_t vec160;                                                                   \
 206     register vec_u8_t delta;                                                                    \
 207     register vec_u8_t deltaneg;                                                                 \
 208                                                                                                 \
 209     q1minus = vec_nor(q1, q1);                /* 255 - q1 */                                    \
 210     stage1 = vec_avg(p1, q1minus);            /* (p1 - q1 + 256)>>1 */                          \
 211     stage2 = vec_sr(stage1, vec_splat_u8(1)); /* (p1 - q1 + 256)>>2 = 64 + (p1 - q1) >> 2 */    \
 212     p0minus = vec_nor(p0, p0);                /* 255 - p0 */                                    \
 213     stage1 = vec_avg(q0, p0minus);            /* (q0 - p0 + 256)>>1 */                          \
 214     pq0bit = vec_and(pq0bit, vec_splat_u8(1));                                                  \
 215     stage2 = vec_avg(stage2, pq0bit);         /* 32 + ((q0 - p0)&1 + (p1 - q1) >> 2 + 1) >> 1 */\
 216     stage2 = vec_adds(stage2, stage1);        /* 160 + ((p0 - q0) + (p1 - q1) >> 2 + 1) >> 1 */ \
 217     vec160 = vec_ld(0, &A0v);                                                                   \
 218     deltaneg = vec_subs(vec160, stage2);      /* -d */                                          \
 219     delta = vec_subs(stage2, vec160);         /*  d */                                          \
 220     deltaneg = vec_min(tc0masked, deltaneg);                                                    \
 221     delta = vec_min(tc0masked, delta);                                                          \
 222     p0 = vec_subs(p0, deltaneg);                                                                \
 223     q0 = vec_subs(q0, delta);                                                                   \
 224     p0 = vec_adds(p0, delta);                                                                   \
 225     q0 = vec_adds(q0, deltaneg);                                                                \
 226 }
 227
 228 #define h264_loop_filter_luma_altivec(p2, p1, p0, q0, q1, q2, alpha, beta, tc0) {            \
 229     DECLARE_ALIGNED_16(unsigned char temp[16]);                                              \
 230     register vec_u8_t alphavec;                                                              \
 231     register vec_u8_t betavec;                                                               \
 232     register vec_u8_t mask;                                                                  \
 233     register vec_u8_t p1mask;                                                                \
 234     register vec_u8_t q1mask;                                                                \
 235     register vec_s8_t tc0vec;                                                                \
 236     register vec_u8_t finaltc0;                                                              \
 237     register vec_u8_t tc0masked;                                                             \
 238     register vec_u8_t newp1;                                                                 \
 239     register vec_u8_t newq1;                                                                 \
 240                                                                                              \
 241     temp[0] = alpha;                                                                         \
 242     temp[1] = beta;                                                                          \
 243     alphavec = vec_ld(0, temp);                                                              \
 244     betavec = vec_splat(alphavec, 0x1);                                                      \
 245     alphavec = vec_splat(alphavec, 0x0);                                                     \
 246     mask = h264_deblock_mask(p0, p1, q0, q1, alphavec, betavec); /*if in block */            \
 247                                                                                              \
 248     *((int *)temp) = *((int *)tc0);                                                          \
 249     tc0vec = vec_ld(0, (signed char*)temp);                                                  \
 250     tc0vec = vec_mergeh(tc0vec, tc0vec);                                                     \
 251     tc0vec = vec_mergeh(tc0vec, tc0vec);                                                     \
 252     mask = vec_and(mask, vec_cmpgt(tc0vec, vec_splat_s8(-1)));  /* if tc0[i] >= 0 */         \
 253     finaltc0 = vec_and((vec_u8_t)tc0vec, mask);                 /* tc = tc0 */               \
 254                                                                                              \
 255     p1mask = diff_lt_altivec(p2, p0, betavec);                                               \
 256     p1mask = vec_and(p1mask, mask);                             /* if( |p2 - p0| < beta) */  \
 257     tc0masked = vec_and(p1mask, (vec_u8_t)tc0vec);                                           \
 258     finaltc0 = vec_sub(finaltc0, p1mask);                       /* tc++ */                   \
 259     newp1 = h264_deblock_q1(p0, p1, p2, q0, tc0masked);                                      \
 260     /*end if*/                                                                               \
 261                                                                                              \
 262     q1mask = diff_lt_altivec(q2, q0, betavec);                                               \
 263     q1mask = vec_and(q1mask, mask);                             /* if ( |q2 - q0| < beta ) */\
 264     tc0masked = vec_and(q1mask, (vec_u8_t)tc0vec);                                           \
 265     finaltc0 = vec_sub(finaltc0, q1mask);                       /* tc++ */                   \
 266     newq1 = h264_deblock_q1(p0, q1, q2, q0, tc0masked);                                      \
 267     /*end if*/                                                                               \
 268                                                                                              \
 269     h264_deblock_p0_q0(p0, p1, q0, q1, finaltc0);                                            \
 270     p1 = newp1;                                                                              \
 271     q1 = newq1;                                                                              \
 272 }
 273
 274 void x264_deblock_v_luma_altivec(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0) {
 275
 276     if((tc0[0] & tc0[1] & tc0[2] & tc0[3]) >= 0) {
 277         register vec_u8_t p2 = vec_ld(-3*stride, pix);
 278         register vec_u8_t p1 = vec_ld(-2*stride, pix);
 279         register vec_u8_t p0 = vec_ld(-1*stride, pix);
 280         register vec_u8_t q0 = vec_ld(0, pix);
 281         register vec_u8_t q1 = vec_ld(stride, pix);
 282         register vec_u8_t q2 = vec_ld(2*stride, pix);
 283         h264_loop_filter_luma_altivec(p2, p1, p0, q0, q1, q2, alpha, beta, tc0);
 284         vec_st(p1, -2*stride, pix);
 285         vec_st(p0, -1*stride, pix);
 286         vec_st(q0, 0, pix);
 287         vec_st(q1, stride, pix);
 288     }
 289 }
 290
 291 void x264_deblock_h_luma_altivec(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0) {
 292
 293     register vec_u8_t line0, line1, line2, line3, line4, line5;
 294     if((tc0[0] & tc0[1] & tc0[2] & tc0[3]) < 0)
 295         return;
 296     PREP_LOAD;
 297     readAndTranspose16x6(pix-3, stride, line0, line1, line2, line3, line4, line5);
 298     h264_loop_filter_luma_altivec(line0, line1, line2, line3, line4, line5, alpha, beta, tc0);
 299     transpose4x16(line1, line2, line3, line4);
 300     write16x4(pix-2, stride, line1, line2, line3, line4);
 301 }