mc.c 15.6 KB
Newer Older
Laurent Aimar's avatar
Laurent Aimar committed
1 2 3
/*****************************************************************************
 * mc.c: h264 encoder library (Motion Compensation)
 *****************************************************************************
4
 * Copyright (C) 2003-2008 x264 project
Laurent Aimar's avatar
Laurent Aimar committed
5 6
 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
7
 *          Loren Merritt <lorenm@u.washington.edu>
Laurent Aimar's avatar
Laurent Aimar committed
8 9 10 11 12 13 14 15 16 17 18 19 20
 *
 * 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
21
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
Laurent Aimar's avatar
Laurent Aimar committed
22 23
 *****************************************************************************/

Loren Merritt's avatar
Loren Merritt committed
24
#include "common.h"
Laurent Aimar's avatar
Laurent Aimar committed
25

26
#ifdef HAVE_MMX
27
#include "x86/mc.h"
Laurent Aimar's avatar
Laurent Aimar committed
28
#endif
29
#ifdef ARCH_PPC
30
#include "ppc/mc.h"
Laurent Aimar's avatar
Laurent Aimar committed
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
#endif


static inline void pixel_avg( uint8_t *dst,  int i_dst_stride,
                              uint8_t *src1, int i_src1_stride,
                              uint8_t *src2, int i_src2_stride,
                              int i_width, int i_height )
{
    int x, y;
    for( y = 0; y < i_height; y++ )
    {
        for( x = 0; x < i_width; x++ )
        {
            dst[x] = ( src1[x] + src2[x] + 1 ) >> 1;
        }
        dst  += i_dst_stride;
        src1 += i_src1_stride;
        src2 += i_src2_stride;
    }
}

52
static inline void pixel_avg_wxh( uint8_t *dst, int i_dst, uint8_t *src1, int i_src1, uint8_t *src2, int i_src2, int width, int height )
53 54 55 56 57 58
{
    int x, y;
    for( y = 0; y < height; y++ )
    {
        for( x = 0; x < width; x++ )
        {
59
            dst[x] = ( src1[x] + src2[x] + 1 ) >> 1;
60
        }
61 62
        src1 += i_src1;
        src2 += i_src2;
63 64 65 66 67 68
        dst += i_dst;
    }
}

/* Implicit weighted bipred only:
 * assumes log2_denom = 5, offset = 0, weight1 + weight2 = 64 */
69 70 71
#define op_scale2(x) dst[x] = x264_clip_uint8( (src1[x]*i_weight1 + src2[x]*i_weight2 + (1<<5)) >> 6 )
static inline void pixel_avg_weight_wxh( uint8_t *dst, int i_dst, uint8_t *src1, int i_src1, uint8_t *src2, int i_src2, int width, int height, int i_weight1 )
{
72 73
    int y;
    const int i_weight2 = 64 - i_weight1;
74 75
    for( y = 0; y<height; y++, dst += i_dst, src1 += i_src1, src2 += i_src2 )
    {
76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96
        op_scale2(0);
        op_scale2(1);
        if(width==2) continue;
        op_scale2(2);
        op_scale2(3);
        if(width==4) continue;
        op_scale2(4);
        op_scale2(5);
        op_scale2(6);
        op_scale2(7);
        if(width==8) continue;
        op_scale2(8);
        op_scale2(9);
        op_scale2(10);
        op_scale2(11);
        op_scale2(12);
        op_scale2(13);
        op_scale2(14);
        op_scale2(15);
    }
}
Fiona Glaser's avatar
Fiona Glaser committed
97
#undef op_scale2
98

Fiona Glaser's avatar
Fiona Glaser committed
99 100 101 102
#define PIXEL_AVG_C( name, width, height ) \
static void name( uint8_t *pix1, int i_stride_pix1, \
                  uint8_t *pix2, int i_stride_pix2, \
                  uint8_t *pix3, int i_stride_pix3, int weight ) \
103
{ \
Fiona Glaser's avatar
Fiona Glaser committed
104 105 106 107
    if( weight == 32 )\
        pixel_avg_wxh( pix1, i_stride_pix1, pix2, i_stride_pix2, pix3, i_stride_pix3, width, height ); \
    else\
        pixel_avg_weight_wxh( pix1, i_stride_pix1, pix2, i_stride_pix2, pix3, i_stride_pix3, width, height, weight ); \
108
}
Fiona Glaser's avatar
Fiona Glaser committed
109 110 111 112 113 114 115 116 117 118
PIXEL_AVG_C( pixel_avg_16x16, 16, 16 )
PIXEL_AVG_C( pixel_avg_16x8,  16, 8 )
PIXEL_AVG_C( pixel_avg_8x16,  8, 16 )
PIXEL_AVG_C( pixel_avg_8x8,   8, 8 )
PIXEL_AVG_C( pixel_avg_8x4,   8, 4 )
PIXEL_AVG_C( pixel_avg_4x8,   4, 8 )
PIXEL_AVG_C( pixel_avg_4x4,   4, 4 )
PIXEL_AVG_C( pixel_avg_4x2,   4, 2 )
PIXEL_AVG_C( pixel_avg_2x4,   2, 4 )
PIXEL_AVG_C( pixel_avg_2x2,   2, 2 )
119

Laurent Aimar's avatar
Laurent Aimar committed
120 121 122 123 124 125 126 127 128 129 130 131 132
static void mc_copy( uint8_t *src, int i_src_stride, uint8_t *dst, int i_dst_stride, int i_width, int i_height )
{
    int y;

    for( y = 0; y < i_height; y++ )
    {
        memcpy( dst, src, i_width );

        src += i_src_stride;
        dst += i_dst_stride;
    }
}

Loren Merritt's avatar
Loren Merritt committed
133 134
#define TAPFILTER(pix, d) ((pix)[x-2*d] + (pix)[x+3*d] - 5*((pix)[x-d] + (pix)[x+2*d]) + 20*((pix)[x] + (pix)[x+d]))
static void hpel_filter( uint8_t *dsth, uint8_t *dstv, uint8_t *dstc, uint8_t *src,
135
                         int stride, int width, int height, int16_t *buf )
Laurent Aimar's avatar
Laurent Aimar committed
136 137
{
    int x, y;
Loren Merritt's avatar
Loren Merritt committed
138
    for( y=0; y<height; y++ )
Laurent Aimar's avatar
Laurent Aimar committed
139
    {
Loren Merritt's avatar
Loren Merritt committed
140
        for( x=-2; x<width+3; x++ )
Laurent Aimar's avatar
Laurent Aimar committed
141
        {
Loren Merritt's avatar
Loren Merritt committed
142 143 144
            int v = TAPFILTER(src,stride);
            dstv[x] = x264_clip_uint8((v + 16) >> 5);
            buf[x+2] = v;
Laurent Aimar's avatar
Laurent Aimar committed
145
        }
Loren Merritt's avatar
Loren Merritt committed
146 147 148 149 150 151 152 153
        for( x=0; x<width; x++ )
            dstc[x] = x264_clip_uint8((TAPFILTER(buf+2,1) + 512) >> 10);
        for( x=0; x<width; x++ )
            dsth[x] = x264_clip_uint8((TAPFILTER(src,1) + 16) >> 5);
        dsth += stride;
        dstv += stride;
        dstc += stride;
        src += stride;
Laurent Aimar's avatar
Laurent Aimar committed
154
    }
155 156
}

Loren Merritt's avatar
Loren Merritt committed
157 158 159
static const int hpel_ref0[16] = {0,1,1,1,0,1,1,1,2,3,3,3,0,1,1,1};
static const int hpel_ref1[16] = {0,0,0,0,2,2,3,2,2,2,3,2,2,2,3,2};

160 161
static void mc_luma( uint8_t *dst,    int i_dst_stride,
                     uint8_t *src[4], int i_src_stride,
Loren Merritt's avatar
Loren Merritt committed
162
                     int mvx, int mvy,
Loren Merritt's avatar
Loren Merritt committed
163
                     int i_width, int i_height )
164
{
Loren Merritt's avatar
Loren Merritt committed
165 166 167
    int qpel_idx = ((mvy&3)<<2) + (mvx&3);
    int offset = (mvy>>2)*i_src_stride + (mvx>>2);
    uint8_t *src1 = src[hpel_ref0[qpel_idx]] + offset + ((mvy&3) == 3) * i_src_stride;
168

Loren Merritt's avatar
Loren Merritt committed
169
    if( qpel_idx & 5 ) /* qpel interpolation needed */
170
    {
Loren Merritt's avatar
Loren Merritt committed
171
        uint8_t *src2 = src[hpel_ref1[qpel_idx]] + offset + ((mvx&3) == 3);
172 173 174 175 176 177 178 179 180
        pixel_avg( dst, i_dst_stride, src1, i_src_stride,
                   src2, i_src_stride, i_width, i_height );
    }
    else
    {
        mc_copy( src1, i_src_stride, dst, i_dst_stride, i_width, i_height );
    }
}

181 182
static uint8_t *get_ref( uint8_t *dst,   int *i_dst_stride,
                         uint8_t *src[4], int i_src_stride,
Loren Merritt's avatar
Loren Merritt committed
183
                         int mvx, int mvy,
Loren Merritt's avatar
Loren Merritt committed
184
                         int i_width, int i_height )
185
{
Loren Merritt's avatar
Loren Merritt committed
186 187 188
    int qpel_idx = ((mvy&3)<<2) + (mvx&3);
    int offset = (mvy>>2)*i_src_stride + (mvx>>2);
    uint8_t *src1 = src[hpel_ref0[qpel_idx]] + offset + ((mvy&3) == 3) * i_src_stride;
189

Loren Merritt's avatar
Loren Merritt committed
190
    if( qpel_idx & 5 ) /* qpel interpolation needed */
191
    {
Loren Merritt's avatar
Loren Merritt committed
192
        uint8_t *src2 = src[hpel_ref1[qpel_idx]] + offset + ((mvx&3) == 3);
193 194 195 196 197 198 199 200 201 202 203
        pixel_avg( dst, *i_dst_stride, src1, i_src_stride,
                   src2, i_src_stride, i_width, i_height );
        return dst;
    }
    else
    {
        *i_dst_stride = i_src_stride;
        return src1;
    }
}

Laurent Aimar's avatar
Laurent Aimar committed
204
/* full chroma mc (ie until 1/8 pixel)*/
205 206 207 208
static void mc_chroma( uint8_t *dst, int i_dst_stride,
                       uint8_t *src, int i_src_stride,
                       int mvx, int mvy,
                       int i_width, int i_height )
Laurent Aimar's avatar
Laurent Aimar committed
209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237
{
    uint8_t *srcp;
    int x, y;

    const int d8x = mvx&0x07;
    const int d8y = mvy&0x07;

    const int cA = (8-d8x)*(8-d8y);
    const int cB = d8x    *(8-d8y);
    const int cC = (8-d8x)*d8y;
    const int cD = d8x    *d8y;

    src  += (mvy >> 3) * i_src_stride + (mvx >> 3);
    srcp = &src[i_src_stride];

    for( y = 0; y < i_height; y++ )
    {
        for( x = 0; x < i_width; x++ )
        {
            dst[x] = ( cA*src[x]  + cB*src[x+1] +
                       cC*srcp[x] + cD*srcp[x+1] + 32 ) >> 6;
        }
        dst  += i_dst_stride;

        src   = srcp;
        srcp += i_src_stride;
    }
}

Loren Merritt's avatar
Loren Merritt committed
238 239 240 241 242 243 244 245 246
#define MC_COPY(W) \
static void mc_copy_w##W( uint8_t *dst, int i_dst, uint8_t *src, int i_src, int i_height ) \
{ \
    mc_copy( src, i_src, dst, i_dst, W, i_height ); \
}
MC_COPY( 16 )
MC_COPY( 8 )
MC_COPY( 4 )

247 248 249 250 251 252 253 254 255 256 257
static void plane_copy( uint8_t *dst, int i_dst,
                        uint8_t *src, int i_src, int w, int h)
{
    while( h-- )
    {
        memcpy( dst, src, w );
        dst += i_dst;
        src += i_src;
    }
}

Fiona Glaser's avatar
Fiona Glaser committed
258 259
static void prefetch_fenc_null( uint8_t *pix_y, int stride_y,
                                uint8_t *pix_uv, int stride_uv, int mb_x )
260 261
{}

Fiona Glaser's avatar
Fiona Glaser committed
262
static void prefetch_ref_null( uint8_t *pix, int stride, int parity )
263 264
{}

Fiona Glaser's avatar
Fiona Glaser committed
265 266 267 268 269
static void memzero_aligned( void * dst, int n )
{
    memset( dst, 0, n );
}

Loren Merritt's avatar
Loren Merritt committed
270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305
static void integral_init4h( uint16_t *sum, uint8_t *pix, int stride )
{
    int x, v = pix[0]+pix[1]+pix[2]+pix[3];
    for( x=0; x<stride-4; x++ )
    {
        sum[x] = v + sum[x-stride];
        v += pix[x+4] - pix[x];
    }
}

static void integral_init8h( uint16_t *sum, uint8_t *pix, int stride )
{
    int x, v = pix[0]+pix[1]+pix[2]+pix[3]+pix[4]+pix[5]+pix[6]+pix[7];
    for( x=0; x<stride-8; x++ )
    {
        sum[x] = v + sum[x-stride];
        v += pix[x+8] - pix[x];
    }
}

static void integral_init4v( uint16_t *sum8, uint16_t *sum4, int stride )
{
    int x;
    for( x=0; x<stride-8; x++ )
        sum4[x] = sum8[x+4*stride] - sum8[x];
    for( x=0; x<stride-8; x++ )
        sum8[x] = sum8[x+8*stride] + sum8[x+8*stride+4] - sum8[x] - sum8[x+4];
}

static void integral_init8v( uint16_t *sum8, int stride )
{
    int x;
    for( x=0; x<stride-8; x++ )
        sum8[x] = sum8[x+8*stride] - sum8[x];
}

Loren Merritt's avatar
Loren Merritt committed
306 307 308 309 310 311 312 313 314 315 316
void x264_frame_init_lowres( x264_t *h, x264_frame_t *frame )
{
    uint8_t *src = frame->plane[0];
    int i_stride = frame->i_stride[0];
    int i_height = frame->i_lines[0];
    int i_width  = frame->i_width[0];
    int x, y;

    // duplicate last row and column so that their interpolation doesn't have to be special-cased
    for( y=0; y<i_height; y++ )
        src[i_width+y*i_stride] = src[i_width-1+y*i_stride];
317
    memcpy( src+i_stride*i_height, src+i_stride*(i_height-1), i_width );
Loren Merritt's avatar
Loren Merritt committed
318 319 320 321
    h->mc.frame_init_lowres_core( src, frame->lowres[0], frame->lowres[1], frame->lowres[2], frame->lowres[3],
                                  i_stride, frame->i_stride_lowres, frame->i_width_lowres, frame->i_lines_lowres );
    x264_frame_expand_border_lowres( frame );

322 323 324 325 326
    memset( frame->i_cost_est, -1, sizeof(frame->i_cost_est) );

    for( x = 0; x < h->param.i_bframe + 2; x++ )
        for( y = 0; y < h->param.i_bframe + 2; y++ )
            frame->i_row_satds[y][x][0] = -1;
327 328 329 330

    for( y = 0; y <= !!h->param.i_bframe; y++ )
        for( x = 0; x <= h->param.i_bframe; x++ )
            frame->lowres_mvs[y][x][0][0] = 0x7FFF;
Loren Merritt's avatar
Loren Merritt committed
331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358
}

static void frame_init_lowres_core( uint8_t *src0, uint8_t *dst0, uint8_t *dsth, uint8_t *dstv, uint8_t *dstc,
                                    int src_stride, int dst_stride, int width, int height )
{
    int x,y;
    for( y=0; y<height; y++ )
    {
        uint8_t *src1 = src0+src_stride;
        uint8_t *src2 = src1+src_stride;
        for( x=0; x<width; x++ )
        {
            // slower than naive bilinear, but matches asm
#define FILTER(a,b,c,d) ((((a+b+1)>>1)+((c+d+1)>>1)+1)>>1)
            dst0[x] = FILTER(src0[2*x  ], src1[2*x  ], src0[2*x+1], src1[2*x+1]);
            dsth[x] = FILTER(src0[2*x+1], src1[2*x+1], src0[2*x+2], src1[2*x+2]);
            dstv[x] = FILTER(src1[2*x  ], src2[2*x  ], src1[2*x+1], src2[2*x+1]);
            dstc[x] = FILTER(src1[2*x+1], src2[2*x+1], src1[2*x+2], src2[2*x+2]);
#undef FILTER
        }
        src0 += src_stride*2;
        dst0 += dst_stride;
        dsth += dst_stride;
        dstv += dst_stride;
        dstc += dst_stride;
    }
}

359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385
#if defined(__GNUC__) && (defined(ARCH_X86) || defined(ARCH_X86_64))
// gcc isn't smart enough to use the "idiv" instruction
static ALWAYS_INLINE int32_t div_64_32(int64_t x, int32_t y) {
    int32_t quotient, remainder;
    asm("idiv %4"
        :"=a"(quotient), "=d"(remainder)
        :"a"((uint32_t)x), "d"((int32_t)(x>>32)), "r"(y)
    );
    return quotient;
}
#else
#define div_64_32(x,y) ((x)/(y))
#endif

/* Estimate the total amount of influence on future quality that could be had if we
 * were to improve the reference samples used to inter predict any given macroblock. */
static void mbtree_propagate_cost( int *dst, uint16_t *propagate_in, uint16_t *intra_costs,
                                   uint16_t *inter_costs, uint16_t *inv_qscales, int len )
{
    int i;
    for( i=0; i<len; i++ )
    {
        int propagate_amount = propagate_in[i] + ((intra_costs[i] * inv_qscales[i] + 128)>>8);
        dst[i] = div_64_32((int64_t)propagate_amount * (intra_costs[i] - inter_costs[i]), intra_costs[i]);
    }
}

386
void x264_mc_init( int cpu, x264_mc_functions_t *pf )
Laurent Aimar's avatar
Laurent Aimar committed
387
{
388 389
    pf->mc_luma   = mc_luma;
    pf->get_ref   = get_ref;
390
    pf->mc_chroma = mc_chroma;
Laurent Aimar's avatar
Laurent Aimar committed
391

392 393 394 395 396 397 398 399 400 401
    pf->avg[PIXEL_16x16]= pixel_avg_16x16;
    pf->avg[PIXEL_16x8] = pixel_avg_16x8;
    pf->avg[PIXEL_8x16] = pixel_avg_8x16;
    pf->avg[PIXEL_8x8]  = pixel_avg_8x8;
    pf->avg[PIXEL_8x4]  = pixel_avg_8x4;
    pf->avg[PIXEL_4x8]  = pixel_avg_4x8;
    pf->avg[PIXEL_4x4]  = pixel_avg_4x4;
    pf->avg[PIXEL_4x2]  = pixel_avg_4x2;
    pf->avg[PIXEL_2x4]  = pixel_avg_2x4;
    pf->avg[PIXEL_2x2]  = pixel_avg_2x2;
Loren Merritt's avatar
Loren Merritt committed
402

403
    pf->copy_16x16_unaligned = mc_copy_w16;
Loren Merritt's avatar
Loren Merritt committed
404 405 406 407
    pf->copy[PIXEL_16x16] = mc_copy_w16;
    pf->copy[PIXEL_8x8]   = mc_copy_w8;
    pf->copy[PIXEL_4x4]   = mc_copy_w4;

408
    pf->plane_copy = plane_copy;
409
    pf->hpel_filter = hpel_filter;
410

411 412
    pf->prefetch_fenc = prefetch_fenc_null;
    pf->prefetch_ref  = prefetch_ref_null;
Fiona Glaser's avatar
Fiona Glaser committed
413
    pf->memcpy_aligned = memcpy;
Fiona Glaser's avatar
Fiona Glaser committed
414
    pf->memzero_aligned = memzero_aligned;
Loren Merritt's avatar
Loren Merritt committed
415
    pf->frame_init_lowres_core = frame_init_lowres_core;
416

Loren Merritt's avatar
Loren Merritt committed
417 418 419 420 421
    pf->integral_init4h = integral_init4h;
    pf->integral_init8h = integral_init8h;
    pf->integral_init4v = integral_init4v;
    pf->integral_init8v = integral_init8v;

422 423
    pf->mbtree_propagate_cost = mbtree_propagate_cost;

424
#ifdef HAVE_MMX
Loren Merritt's avatar
Loren Merritt committed
425
    x264_mc_init_mmx( cpu, pf );
426
#endif
427
#ifdef ARCH_PPC
Laurent Aimar's avatar
Laurent Aimar committed
428 429 430 431 432
    if( cpu&X264_CPU_ALTIVEC )
        x264_mc_altivec_init( pf );
#endif
}

433
void x264_frame_filter( x264_t *h, x264_frame_t *frame, int mb_y, int b_end )
434
{
435
    const int b_interlaced = h->sh.b_mbaff;
436
    const int stride = frame->i_stride[0] << b_interlaced;
437
    const int width = frame->i_width[0];
438
    int start = (mb_y*16 >> b_interlaced) - 8; // buffer = 4 for deblock + 3 for 6tap, rounded to 8
Loren Merritt's avatar
Loren Merritt committed
439
    int height = ((b_end ? frame->i_lines[0] : mb_y*16) >> b_interlaced) + 8;
440
    int offs = start*stride - 8; // buffer = 3 for 6tap, aligned to 8 for simd
Loren Merritt's avatar
Loren Merritt committed
441
    int y;
442

Loren Merritt's avatar
Loren Merritt committed
443 444
    if( mb_y & b_interlaced )
        return;
445

446
    for( y=0; y<=b_interlaced; y++, offs+=frame->i_stride[0] )
447
    {
448
        h->mc.hpel_filter(
449 450 451 452
            frame->filtered[1] + offs,
            frame->filtered[2] + offs,
            frame->filtered[3] + offs,
            frame->plane[0] + offs,
453 454
            stride, width + 16, height - start,
            h->scratch_buffer );
455
    }
456 457

    /* generate integral image:
Loren Merritt's avatar
Loren Merritt committed
458 459
     * frame->integral contains 2 planes. in the upper plane, each element is
     * the sum of an 8x8 pixel region with top-left corner on that point.
Loren Merritt's avatar
Loren Merritt committed
460
     * in the lower plane, 4x4 sums (needed only with --partitions p4x4). */
461

Loren Merritt's avatar
Loren Merritt committed
462
    if( frame->integral )
463
    {
Loren Merritt's avatar
Loren Merritt committed
464 465
        if( start < 0 )
        {
466 467
            memset( frame->integral - PADV * stride - PADH, 0, stride * sizeof(uint16_t) );
            start = -PADV;
Loren Merritt's avatar
Loren Merritt committed
468 469
        }
        if( b_end )
470
            height += PADV-9;
Loren Merritt's avatar
Loren Merritt committed
471
        for( y = start; y < height; y++ )
472
        {
Loren Merritt's avatar
Loren Merritt committed
473 474 475 476 477 478 479 480 481 482 483 484
            uint8_t  *pix  = frame->plane[0] + y * stride - PADH;
            uint16_t *sum8 = frame->integral + (y+1) * stride - PADH;
            uint16_t *sum4;
            if( h->frames.b_have_sub8x8_esa )
            {
                h->mc.integral_init4h( sum8, pix, stride );
                sum8 -= 8*stride;
                sum4 = sum8 + stride * (frame->i_lines[0] + PADV*2);
                if( y >= 8-PADV )
                    h->mc.integral_init4v( sum8, sum4, stride );
            }
            else
Loren Merritt's avatar
Loren Merritt committed
485
            {
Loren Merritt's avatar
Loren Merritt committed
486 487 488
                h->mc.integral_init8h( sum8, pix, stride );
                if( y >= 8-PADV )
                    h->mc.integral_init8v( sum8-8*stride, stride );
Loren Merritt's avatar
Loren Merritt committed
489 490
            }
        }
491
    }
492
}