git.sesse.net Git - x264/blob - encoder/macroblock.c

   1 /*****************************************************************************
   2  * macroblock.c: h264 encoder library
   3  *****************************************************************************
   4  * Copyright (C) 2003-2008 x264 project
   5  *
   6  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   7  *          Loren Merritt <lorenm@u.washington.edu>
   8  *          Fiona Glaser <fiona@x264.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 #include "common/common.h"
  26 #include "macroblock.h"
  27
  28 #define ZIG(i,y,x) level[i] = dct[x][y];
  29 static inline void zigzag_scan_2x2_dc( int16_t level[4], int16_t dct[2][2] )
  30 {
  31     ZIG(0,0,0)
  32     ZIG(1,0,1)
  33     ZIG(2,1,0)
  34     ZIG(3,1,1)
  35 }
  36 #undef ZIG
  37
  38 /* (ref: JVT-B118)
  39  * x264_mb_decimate_score: given dct coeffs it returns a score to see if we could empty this dct coeffs
  40  * to 0 (low score means set it to null)
  41  * Used in inter macroblock (luma and chroma)
  42  *  luma: for a 8x8 block: if score < 4 -> null
  43  *        for the complete mb: if score < 6 -> null
  44  *  chroma: for the complete mb: if score < 7 -> null
  45  */
  46 static int x264_mb_decimate_score( int16_t *dct, int i_max )
  47 {
  48     static const int i_ds_table4[16] = {
  49         3,2,2,1,1,1,0,0,0,0,0,0,0,0,0,0 };
  50     static const int i_ds_table8[64] = {
  51         3,3,3,3,2,2,2,2,2,2,2,2,1,1,1,1,
  52         1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,
  53         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
  54         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
  55
  56     const int *ds_table = (i_max == 64) ? i_ds_table8 : i_ds_table4;
  57     int i_score = 0;
  58     int idx = i_max - 1;
  59
  60     while( idx >= 0 && dct[idx] == 0 )
  61         idx--;
  62
  63     while( idx >= 0 )
  64     {
  65         int i_run;
  66
  67         if( (unsigned)(dct[idx--] + 1) > 2 )
  68             return 9;
  69
  70         i_run = 0;
  71         while( idx >= 0 && dct[idx] == 0 )
  72         {
  73             idx--;
  74             i_run++;
  75         }
  76         i_score += ds_table[i_run];
  77     }
  78
  79     return i_score;
  80 }
  81
  82 static ALWAYS_INLINE void x264_quant_4x4( x264_t *h, int16_t dct[4][4], int i_qp, int i_ctxBlockCat, int b_intra )
  83 {
  84     int i_quant_cat = b_intra ? CQM_4IY : CQM_4PY;
  85     if( h->mb.b_trellis )
  86         x264_quant_4x4_trellis( h, dct, i_quant_cat, i_qp, i_ctxBlockCat, b_intra );
  87     else
  88         h->quantf.quant_4x4( dct, h->quant4_mf[i_quant_cat][i_qp], h->quant4_bias[i_quant_cat][i_qp] );
  89 }
  90
  91 static ALWAYS_INLINE void x264_quant_8x8( x264_t *h, int16_t dct[8][8], int i_qp, int b_intra )
  92 {
  93     int i_quant_cat = b_intra ? CQM_8IY : CQM_8PY;
  94     if( h->mb.b_trellis )
  95         x264_quant_8x8_trellis( h, dct, i_quant_cat, i_qp, b_intra );
  96     else
  97         h->quantf.quant_8x8( dct, h->quant8_mf[i_quant_cat][i_qp], h->quant8_bias[i_quant_cat][i_qp] );
  98 }
  99
 100 void x264_mb_encode_i4x4( x264_t *h, int idx, int i_qp )
 101 {
 102     uint8_t *p_src = &h->mb.pic.p_fenc[0][block_idx_xy_fenc[idx]];
 103     uint8_t *p_dst = &h->mb.pic.p_fdec[0][block_idx_xy_fdec[idx]];
 104     DECLARE_ALIGNED_16( int16_t dct4x4[4][4] );
 105
 106     if( h->mb.b_lossless )
 107     {
 108         h->zigzagf.sub_4x4( h->dct.luma4x4[idx], p_src, p_dst );
 109         return;
 110     }
 111
 112     h->dctf.sub4x4_dct( dct4x4, p_src, p_dst );
 113
 114     x264_quant_4x4( h, dct4x4, i_qp, DCT_LUMA_4x4, 1 );
 115
 116     if( array_non_zero( dct4x4 ) )
 117     {
 118         h->zigzagf.scan_4x4( h->dct.luma4x4[idx], dct4x4 );
 119         h->quantf.dequant_4x4( dct4x4, h->dequant4_mf[CQM_4IY], i_qp );
 120
 121         /* output samples to fdec */
 122         h->dctf.add4x4_idct( p_dst, dct4x4 );
 123     }
 124     else
 125         memset( h->dct.luma4x4[idx], 0, sizeof(h->dct.luma4x4[idx]));
 126 }
 127
 128 void x264_mb_encode_i8x8( x264_t *h, int idx, int i_qp )
 129 {
 130     int x = 8 * (idx&1);
 131     int y = 8 * (idx>>1);
 132     uint8_t *p_src = &h->mb.pic.p_fenc[0][x+y*FENC_STRIDE];
 133     uint8_t *p_dst = &h->mb.pic.p_fdec[0][x+y*FDEC_STRIDE];
 134     DECLARE_ALIGNED_16( int16_t dct8x8[8][8] );
 135
 136     h->dctf.sub8x8_dct8( dct8x8, p_src, p_dst );
 137
 138     x264_quant_8x8( h, dct8x8, i_qp, 1 );
 139
 140     h->zigzagf.scan_8x8( h->dct.luma8x8[idx], dct8x8 );
 141     h->quantf.dequant_8x8( dct8x8, h->dequant8_mf[CQM_8IY], i_qp );
 142     h->dctf.add8x8_idct8( p_dst, dct8x8 );
 143 }
 144
 145 static void x264_mb_encode_i16x16( x264_t *h, int i_qp )
 146 {
 147     uint8_t  *p_src = h->mb.pic.p_fenc[0];
 148     uint8_t  *p_dst = h->mb.pic.p_fdec[0];
 149
 150     DECLARE_ALIGNED_16( int16_t dct4x4[16][4][4] );
 151     DECLARE_ALIGNED_16( int16_t dct_dc4x4[4][4] );
 152
 153     int i;
 154
 155     if( h->mb.b_lossless )
 156     {
 157         for( i = 0; i < 16; i++ )
 158         {
 159             int oe = block_idx_xy_fenc[i];
 160             int od = block_idx_xy_fdec[i];
 161             h->zigzagf.sub_4x4( h->dct.luma4x4[i], p_src+oe, p_dst+od );
 162             dct_dc4x4[0][block_idx_yx_1d[i]] = h->dct.luma4x4[i][0];
 163             h->dct.luma4x4[i][0] = 0;
 164         }
 165         h->zigzagf.scan_4x4( h->dct.luma16x16_dc, dct_dc4x4 );
 166         return;
 167     }
 168
 169     h->dctf.sub16x16_dct( dct4x4, p_src, p_dst );
 170     for( i = 0; i < 16; i++ )
 171     {
 172         /* copy dc coeff */
 173         dct_dc4x4[0][block_idx_xy_1d[i]] = dct4x4[i][0][0];
 174         dct4x4[i][0][0] = 0;
 175
 176         /* quant/scan/dequant */
 177         x264_quant_4x4( h, dct4x4[i], i_qp, DCT_LUMA_AC, 1 );
 178
 179         h->zigzagf.scan_4x4( h->dct.luma4x4[i], dct4x4[i] );
 180         h->quantf.dequant_4x4( dct4x4[i], h->dequant4_mf[CQM_4IY], i_qp );
 181     }
 182
 183     h->dctf.dct4x4dc( dct_dc4x4 );
 184     h->quantf.quant_4x4_dc( dct_dc4x4, h->quant4_mf[CQM_4IY][i_qp][0]>>1, h->quant4_bias[CQM_4IY][i_qp][0]<<1 );
 185     h->zigzagf.scan_4x4( h->dct.luma16x16_dc, dct_dc4x4 );
 186
 187     /* output samples to fdec */
 188     h->dctf.idct4x4dc( dct_dc4x4 );
 189     x264_mb_dequant_4x4_dc( dct_dc4x4, h->dequant4_mf[CQM_4IY], i_qp );  /* XXX not inversed */
 190
 191     /* calculate dct coeffs */
 192     for( i = 0; i < 16; i++ )
 193     {
 194         /* copy dc coeff */
 195         dct4x4[i][0][0] = dct_dc4x4[0][block_idx_xy_1d[i]];
 196     }
 197     /* put pixels to fdec */
 198     h->dctf.add16x16_idct( p_dst, dct4x4 );
 199 }
 200
 201 void x264_mb_encode_8x8_chroma( x264_t *h, int b_inter, int i_qp )
 202 {
 203     int i, ch;
 204     int b_decimate = b_inter && (h->sh.i_type == SLICE_TYPE_B || h->param.analyse.b_dct_decimate);
 205
 206     for( ch = 0; ch < 2; ch++ )
 207     {
 208         uint8_t  *p_src = h->mb.pic.p_fenc[1+ch];
 209         uint8_t  *p_dst = h->mb.pic.p_fdec[1+ch];
 210         int i_decimate_score = 0;
 211
 212         DECLARE_ALIGNED_16( int16_t dct2x2[2][2]  );
 213         DECLARE_ALIGNED_16( int16_t dct4x4[4][4][4] );
 214
 215         if( h->mb.b_lossless )
 216         {
 217             for( i = 0; i < 4; i++ )
 218             {
 219                 int oe = block_idx_x[i]*4 + block_idx_y[i]*4*FENC_STRIDE;
 220                 int od = block_idx_x[i]*4 + block_idx_y[i]*4*FDEC_STRIDE;
 221                 h->zigzagf.sub_4x4( h->dct.luma4x4[16+i+ch*4], p_src+oe, p_dst+od );
 222                 h->dct.chroma_dc[ch][i] = h->dct.luma4x4[16+i+ch*4][0];
 223                 h->dct.luma4x4[16+i+ch*4][0] = 0;
 224             }
 225             continue;
 226         }
 227
 228         h->dctf.sub8x8_dct( dct4x4, p_src, p_dst );
 229         /* calculate dct coeffs */
 230         for( i = 0; i < 4; i++ )
 231         {
 232             /* copy dc coeff */
 233             dct2x2[i>>1][i&1] = dct4x4[i][0][0];
 234             dct4x4[i][0][0] = 0;
 235
 236             /* no trellis; it doesn't seem to help chroma noticeably */
 237             h->quantf.quant_4x4( dct4x4[i], h->quant4_mf[CQM_4IC+b_inter][i_qp], h->quant4_bias[CQM_4IC+b_inter][i_qp] );
 238             h->zigzagf.scan_4x4( h->dct.luma4x4[16+i+ch*4], dct4x4[i] );
 239
 240             if( b_decimate )
 241                 i_decimate_score += x264_mb_decimate_score( h->dct.luma4x4[16+i+ch*4]+1, 15 );
 242         }
 243
 244         h->dctf.dct2x2dc( dct2x2 );
 245         h->quantf.quant_2x2_dc( dct2x2, h->quant4_mf[CQM_4IC+b_inter][i_qp][0]>>1, h->quant4_bias[CQM_4IC+b_inter][i_qp][0]<<1 );
 246         zigzag_scan_2x2_dc( h->dct.chroma_dc[ch], dct2x2 );
 247
 248         /* output samples to fdec */
 249         h->dctf.idct2x2dc( dct2x2 );
 250         x264_mb_dequant_2x2_dc( dct2x2, h->dequant4_mf[CQM_4IC + b_inter], i_qp );  /* XXX not inversed */
 251
 252         if( b_decimate && i_decimate_score < 7 )
 253         {
 254             /* Near null chroma 8x8 block so make it null (bits saving) */
 255             memset( &h->dct.luma4x4[16+ch*4], 0, 4 * sizeof( *h->dct.luma4x4 ) );
 256             if( !array_non_zero( dct2x2 ) )
 257                 continue;
 258             memset( dct4x4, 0, sizeof( dct4x4 ) );
 259         }
 260         else
 261         {
 262             for( i = 0; i < 4; i++ )
 263                 h->quantf.dequant_4x4( dct4x4[i], h->dequant4_mf[CQM_4IC + b_inter], i_qp );
 264         }
 265         dct4x4[0][0][0] = dct2x2[0][0];
 266         dct4x4[1][0][0] = dct2x2[0][1];
 267         dct4x4[2][0][0] = dct2x2[1][0];
 268         dct4x4[3][0][0] = dct2x2[1][1];
 269         h->dctf.add8x8_idct( p_dst, dct4x4 );
 270     }
 271
 272     /* coded block pattern */
 273     h->mb.i_cbp_chroma = 0;
 274     for( i = 0; i < 8; i++ )
 275     {
 276         int nz = array_non_zero( h->dct.luma4x4[16+i] );
 277         h->mb.cache.non_zero_count[x264_scan8[16+i]] = nz;
 278         h->mb.i_cbp_chroma |= nz;
 279     }
 280     if( h->mb.i_cbp_chroma )
 281         h->mb.i_cbp_chroma = 2;    /* dc+ac (we can't do only ac) */
 282     else if( array_non_zero( h->dct.chroma_dc ) )
 283         h->mb.i_cbp_chroma = 1;    /* dc only */
 284 }
 285
 286 static void x264_macroblock_encode_skip( x264_t *h )
 287 {
 288     h->mb.i_cbp_luma = 0x00;
 289     h->mb.i_cbp_chroma = 0x00;
 290     memset( h->mb.cache.non_zero_count, 0, X264_SCAN8_SIZE );
 291     /* store cbp */
 292     h->mb.cbp[h->mb.i_mb_xy] = 0;
 293 }
 294
 295 /*****************************************************************************
 296  * x264_macroblock_encode_pskip:
 297  *  Encode an already marked skip block
 298  *****************************************************************************/
 299 static void x264_macroblock_encode_pskip( x264_t *h )
 300 {
 301     const int mvx = x264_clip3( h->mb.cache.mv[0][x264_scan8[0]][0],
 302                                 h->mb.mv_min[0], h->mb.mv_max[0] );
 303     const int mvy = x264_clip3( h->mb.cache.mv[0][x264_scan8[0]][1],
 304                                 h->mb.mv_min[1], h->mb.mv_max[1] );
 305
 306     /* don't do pskip motion compensation if it was already done in macroblock_analyse */
 307     if( !h->mb.b_skip_mc )
 308     {
 309         h->mc.mc_luma( h->mb.pic.p_fdec[0],    FDEC_STRIDE,
 310                        h->mb.pic.p_fref[0][0], h->mb.pic.i_stride[0],
 311                        mvx, mvy, 16, 16 );
 312
 313         h->mc.mc_chroma( h->mb.pic.p_fdec[1],       FDEC_STRIDE,
 314                          h->mb.pic.p_fref[0][0][4], h->mb.pic.i_stride[1],
 315                          mvx, mvy, 8, 8 );
 316
 317         h->mc.mc_chroma( h->mb.pic.p_fdec[2],       FDEC_STRIDE,
 318                          h->mb.pic.p_fref[0][0][5], h->mb.pic.i_stride[2],
 319                          mvx, mvy, 8, 8 );
 320     }
 321
 322     x264_macroblock_encode_skip( h );
 323 }
 324
 325 /*****************************************************************************
 326  * x264_macroblock_encode:
 327  *****************************************************************************/
 328 void x264_macroblock_encode( x264_t *h )
 329 {
 330     int i_cbp_dc = 0;
 331     int i_qp = h->mb.i_qp;
 332     int b_decimate = h->sh.i_type == SLICE_TYPE_B || h->param.analyse.b_dct_decimate;
 333     int b_force_no_skip = 0;
 334     int i,j,idx;
 335     uint8_t nnz8x8[4] = {1,1,1,1};
 336
 337     if( h->sh.b_mbaff
 338         && h->mb.i_mb_xy == h->sh.i_first_mb + h->mb.i_mb_stride
 339         && IS_SKIP(h->mb.type[h->sh.i_first_mb]) )
 340     {
 341         /* The first skip is predicted to be a frame mb pair.
 342          * We don't yet support the aff part of mbaff, so force it to non-skip
 343          * so that we can pick the aff flag. */
 344         b_force_no_skip = 1;
 345         if( IS_SKIP(h->mb.i_type) )
 346         {
 347             if( h->mb.i_type == P_SKIP )
 348                 h->mb.i_type = P_L0;
 349             else if( h->mb.i_type == B_SKIP )
 350                 h->mb.i_type = B_DIRECT;
 351         }
 352     }
 353
 354     if( h->mb.i_type == P_SKIP )
 355     {
 356         /* A bit special */
 357         x264_macroblock_encode_pskip( h );
 358         return;
 359     }
 360     if( h->mb.i_type == B_SKIP )
 361     {
 362         /* don't do bskip motion compensation if it was already done in macroblock_analyse */
 363         if( !h->mb.b_skip_mc )
 364             x264_mb_mc( h );
 365         x264_macroblock_encode_skip( h );
 366         return;
 367     }
 368
 369     if( h->mb.i_type == I_16x16 )
 370     {
 371         const int i_mode = h->mb.i_intra16x16_pred_mode;
 372         h->mb.b_transform_8x8 = 0;
 373         /* do the right prediction */
 374         h->predict_16x16[i_mode]( h->mb.pic.p_fdec[0] );
 375
 376         /* encode the 16x16 macroblock */
 377         x264_mb_encode_i16x16( h, i_qp );
 378     }
 379     else if( h->mb.i_type == I_8x8 )
 380     {
 381         DECLARE_ALIGNED_16( uint8_t edge[33] );
 382         h->mb.b_transform_8x8 = 1;
 383         /* If we already encoded 3 of the 4 i8x8 blocks, we don't have to do them again. */
 384         if( h->mb.i_skip_intra )
 385         {
 386             h->mc.copy[PIXEL_16x16]( h->mb.pic.p_fdec[0], FDEC_STRIDE, h->mb.pic.i8x8_fdec_buf, 16, 16 );
 387             /* In RD mode, restore the now-overwritten DCT data. */
 388             if( h->mb.i_skip_intra == 2 )
 389                 h->mc.memcpy_aligned( h->dct.luma8x8, h->mb.pic.i8x8_dct_buf, sizeof(h->mb.pic.i8x8_dct_buf) );
 390         }
 391         for( i = h->mb.i_skip_intra ? 3 : 0 ; i < 4; i++ )
 392         {
 393             uint8_t  *p_dst = &h->mb.pic.p_fdec[0][8 * (i&1) + 8 * (i>>1) * FDEC_STRIDE];
 394             int      i_mode = h->mb.cache.intra4x4_pred_mode[x264_scan8[4*i]];
 395
 396             x264_predict_8x8_filter( p_dst, edge, h->mb.i_neighbour8[i], x264_pred_i4x4_neighbors[i_mode] );
 397             h->predict_8x8[i_mode]( p_dst, edge );
 398             x264_mb_encode_i8x8( h, i, i_qp );
 399         }
 400         for( i = 0; i < 4; i++ )
 401             nnz8x8[i] = array_non_zero( h->dct.luma8x8[i] );
 402     }
 403     else if( h->mb.i_type == I_4x4 )
 404     {
 405         h->mb.b_transform_8x8 = 0;
 406         /* If we already encoded 15 of the 16 i4x4 blocks, we don't have to do them again. */
 407         if( h->mb.i_skip_intra )
 408         {
 409             h->mc.copy[PIXEL_16x16]( h->mb.pic.p_fdec[0], FDEC_STRIDE, h->mb.pic.i4x4_fdec_buf, 16, 16 );
 410             /* In RD mode, restore the now-overwritten DCT data. */
 411             if( h->mb.i_skip_intra == 2 )
 412                 h->mc.memcpy_aligned( h->dct.luma4x4, h->mb.pic.i4x4_dct_buf, sizeof(h->mb.pic.i4x4_dct_buf) );
 413         }
 414         for( i = h->mb.i_skip_intra ? 15 : 0 ; i < 16; i++ )
 415         {
 416             uint8_t  *p_dst = &h->mb.pic.p_fdec[0][block_idx_xy_fdec[i]];
 417             int      i_mode = h->mb.cache.intra4x4_pred_mode[x264_scan8[i]];
 418
 419             if( (h->mb.i_neighbour4[i] & (MB_TOPRIGHT|MB_TOP)) == MB_TOP )
 420                 /* emulate missing topright samples */
 421                 *(uint32_t*) &p_dst[4-FDEC_STRIDE] = p_dst[3-FDEC_STRIDE] * 0x01010101U;
 422
 423             h->predict_4x4[i_mode]( p_dst );
 424             x264_mb_encode_i4x4( h, i, i_qp );
 425         }
 426     }
 427     else    /* Inter MB */
 428     {
 429         int i8x8, i4x4;
 430         int i_decimate_mb = 0;
 431
 432         /* Don't repeat motion compensation if it was already done in non-RD transform analysis */
 433         if( !h->mb.b_skip_mc )
 434             x264_mb_mc( h );
 435
 436         if( h->mb.b_lossless )
 437         {
 438             for( i4x4 = 0; i4x4 < 16; i4x4++ )
 439             {
 440                 h->zigzagf.sub_4x4( h->dct.luma4x4[i4x4],
 441                                     h->mb.pic.p_fenc[0]+block_idx_xy_fenc[i4x4],
 442                                     h->mb.pic.p_fdec[0]+block_idx_xy_fdec[i4x4] );
 443             }
 444         }
 445         else if( h->mb.b_transform_8x8 )
 446         {
 447             DECLARE_ALIGNED_16( int16_t dct8x8[4][8][8] );
 448             b_decimate &= !h->mb.b_trellis; // 8x8 trellis is inherently optimal decimation
 449             h->dctf.sub16x16_dct8( dct8x8, h->mb.pic.p_fenc[0], h->mb.pic.p_fdec[0] );
 450             h->nr_count[1] += h->mb.b_noise_reduction * 4;
 451
 452             for( idx = 0; idx < 4; idx++ )
 453             {
 454                 if( h->mb.b_noise_reduction )
 455                     h->quantf.denoise_dct( *dct8x8[idx], h->nr_residual_sum[1], h->nr_offset[1], 64 );
 456                 x264_quant_8x8( h, dct8x8[idx], i_qp, 0 );
 457
 458                 h->zigzagf.scan_8x8( h->dct.luma8x8[idx], dct8x8[idx] );
 459
 460                 if( b_decimate )
 461                 {
 462                     int i_decimate_8x8 = x264_mb_decimate_score( h->dct.luma8x8[idx], 64 );
 463                     i_decimate_mb += i_decimate_8x8;
 464                     if( i_decimate_8x8 < 4 )
 465                         nnz8x8[idx] = 0;
 466                 }
 467                 else
 468                     nnz8x8[idx] = array_non_zero( dct8x8[idx] );
 469             }
 470
 471             if( i_decimate_mb < 6 && b_decimate )
 472                 *(uint32_t*)nnz8x8 = 0;
 473             else
 474             {
 475                 for( idx = 0; idx < 4; idx++ )
 476                     if( nnz8x8[idx] )
 477                     {
 478                         h->quantf.dequant_8x8( dct8x8[idx], h->dequant8_mf[CQM_8PY], i_qp );
 479                         h->dctf.add8x8_idct8( &h->mb.pic.p_fdec[0][(idx&1)*8 + (idx>>1)*8*FDEC_STRIDE], dct8x8[idx] );
 480                     }
 481             }
 482         }
 483         else
 484         {
 485             DECLARE_ALIGNED_16( int16_t dct4x4[16][4][4] );
 486             h->dctf.sub16x16_dct( dct4x4, h->mb.pic.p_fenc[0], h->mb.pic.p_fdec[0] );
 487             h->nr_count[0] += h->mb.b_noise_reduction * 16;
 488
 489             for( i8x8 = 0; i8x8 < 4; i8x8++ )
 490             {
 491                 int i_decimate_8x8;
 492
 493                 /* encode one 4x4 block */
 494                 i_decimate_8x8 = 0;
 495                 for( i4x4 = 0; i4x4 < 4; i4x4++ )
 496                 {
 497                     idx = i8x8 * 4 + i4x4;
 498
 499                     if( h->mb.b_noise_reduction )
 500                         h->quantf.denoise_dct( *dct4x4[idx], h->nr_residual_sum[0], h->nr_offset[0], 16 );
 501                     x264_quant_4x4( h, dct4x4[idx], i_qp, DCT_LUMA_4x4, 0 );
 502
 503                     h->zigzagf.scan_4x4( h->dct.luma4x4[idx], dct4x4[idx] );
 504
 505                     if( b_decimate && i_decimate_8x8 <= 6 )
 506                         i_decimate_8x8 += x264_mb_decimate_score( h->dct.luma4x4[idx], 16 );
 507                 }
 508
 509                 /* decimate this 8x8 block */
 510                 i_decimate_mb += i_decimate_8x8;
 511                 if( i_decimate_8x8 < 4 && b_decimate )
 512                     nnz8x8[i8x8] = 0;
 513             }
 514
 515             if( i_decimate_mb < 6 && b_decimate )
 516                 *(uint32_t*)nnz8x8 = 0;
 517             else
 518             {
 519                 for( i8x8 = 0; i8x8 < 4; i8x8++ )
 520                     if( nnz8x8[i8x8] )
 521                     {
 522                         for( i = 0; i < 4; i++ )
 523                             h->quantf.dequant_4x4( dct4x4[i8x8*4+i], h->dequant4_mf[CQM_4PY], i_qp );
 524                         h->dctf.add8x8_idct( &h->mb.pic.p_fdec[0][(i8x8&1)*8 + (i8x8>>1)*8*FDEC_STRIDE], &dct4x4[i8x8*4] );
 525                     }
 526             }
 527         }
 528     }
 529
 530     /* encode chroma */
 531     if( IS_INTRA( h->mb.i_type ) )
 532     {
 533         const int i_mode = h->mb.i_chroma_pred_mode;
 534         h->predict_8x8c[i_mode]( h->mb.pic.p_fdec[1] );
 535         h->predict_8x8c[i_mode]( h->mb.pic.p_fdec[2] );
 536     }
 537
 538     /* encode the 8x8 blocks */
 539     x264_mb_encode_8x8_chroma( h, !IS_INTRA( h->mb.i_type ), h->mb.i_chroma_qp );
 540
 541     /* coded block pattern and non_zero_count */
 542     h->mb.i_cbp_luma = 0x00;
 543     if( h->mb.i_type == I_16x16 )
 544     {
 545         for( i = 0; i < 16; i++ )
 546         {
 547             int nz = array_non_zero( h->dct.luma4x4[i] );
 548             h->mb.cache.non_zero_count[x264_scan8[i]] = nz;
 549             h->mb.i_cbp_luma |= nz;
 550         }
 551         h->mb.i_cbp_luma *= 0xf;
 552     }
 553     else
 554     {
 555         for( i = 0; i < 4; i++)
 556         {
 557             if(!nnz8x8[i])
 558             {
 559                 *(uint16_t*)&h->mb.cache.non_zero_count[x264_scan8[0+i*4]] = 0;
 560                 *(uint16_t*)&h->mb.cache.non_zero_count[x264_scan8[2+i*4]] = 0;
 561             }
 562             else if( h->mb.b_transform_8x8 )
 563             {
 564                 *(uint16_t*)&h->mb.cache.non_zero_count[x264_scan8[0+4*i]] = nnz8x8[i] * 0x0101;
 565                 *(uint16_t*)&h->mb.cache.non_zero_count[x264_scan8[2+4*i]] = nnz8x8[i] * 0x0101;
 566                 h->mb.i_cbp_luma |= nnz8x8[i] << i;
 567             }
 568             else
 569             {
 570                 int nz, cbp = 0;
 571                 for( j = 0; j < 4; j++ )
 572                 {
 573                     nz = array_non_zero( h->dct.luma4x4[j+4*i] );
 574                     h->mb.cache.non_zero_count[x264_scan8[j+4*i]] = nz;
 575                     cbp |= nz;
 576                 }
 577                 h->mb.i_cbp_luma |= cbp << i;
 578             }
 579         }
 580     }
 581
 582     if( h->param.b_cabac )
 583     {
 584         i_cbp_dc = ( h->mb.i_type == I_16x16 && array_non_zero( h->dct.luma16x16_dc ) )
 585                  | array_non_zero( h->dct.chroma_dc[0] ) << 1
 586                  | array_non_zero( h->dct.chroma_dc[1] ) << 2;
 587     }
 588
 589     /* store cbp */
 590     h->mb.cbp[h->mb.i_mb_xy] = (i_cbp_dc << 8) | (h->mb.i_cbp_chroma << 4) | h->mb.i_cbp_luma;
 591
 592     /* Check for P_SKIP
 593      * XXX: in the me perhaps we should take x264_mb_predict_mv_pskip into account
 594      *      (if multiple mv give same result)*/
 595     if( !b_force_no_skip )
 596     {
 597         if( h->mb.i_type == P_L0 && h->mb.i_partition == D_16x16 &&
 598             !(h->mb.i_cbp_luma | h->mb.i_cbp_chroma) &&
 599             *(uint32_t*)h->mb.cache.mv[0][x264_scan8[0]] == *(uint32_t*)h->mb.cache.pskip_mv
 600             && h->mb.cache.ref[0][x264_scan8[0]] == 0 )
 601         {
 602             h->mb.i_type = P_SKIP;
 603         }
 604
 605         /* Check for B_SKIP */
 606         if( h->mb.i_type == B_DIRECT && !(h->mb.i_cbp_luma | h->mb.i_cbp_chroma) )
 607         {
 608             h->mb.i_type = B_SKIP;
 609         }
 610     }
 611 }
 612
 613 /*****************************************************************************
 614  * x264_macroblock_probe_skip:
 615  *  Check if the current MB could be encoded as a [PB]_SKIP (it supposes you use
 616  *  the previous QP
 617  *****************************************************************************/
 618 int x264_macroblock_probe_skip( x264_t *h, const int b_bidir )
 619 {
 620     DECLARE_ALIGNED_16( int16_t dct4x4[4][4][4] );
 621     DECLARE_ALIGNED_16( int16_t dct2x2[2][2] );
 622     DECLARE_ALIGNED_16( int16_t dctscan[16] );
 623
 624     int i_qp = h->mb.i_qp;
 625     int mvp[2];
 626     int ch, thresh;
 627
 628     int i8x8, i4x4;
 629     int i_decimate_mb;
 630
 631     if( !b_bidir )
 632     {
 633         /* Get the MV */
 634         mvp[0] = x264_clip3( h->mb.cache.pskip_mv[0], h->mb.mv_min[0], h->mb.mv_max[0] );
 635         mvp[1] = x264_clip3( h->mb.cache.pskip_mv[1], h->mb.mv_min[1], h->mb.mv_max[1] );
 636
 637         /* Motion compensation */
 638         h->mc.mc_luma( h->mb.pic.p_fdec[0],    FDEC_STRIDE,
 639                        h->mb.pic.p_fref[0][0], h->mb.pic.i_stride[0],
 640                        mvp[0], mvp[1], 16, 16 );
 641     }
 642
 643     for( i8x8 = 0, i_decimate_mb = 0; i8x8 < 4; i8x8++ )
 644     {
 645         int fenc_offset = (i8x8&1) * 8 + (i8x8>>1) * FENC_STRIDE * 8;
 646         int fdec_offset = (i8x8&1) * 8 + (i8x8>>1) * FDEC_STRIDE * 8;
 647         /* get luma diff */
 648         h->dctf.sub8x8_dct( dct4x4, h->mb.pic.p_fenc[0] + fenc_offset,
 649                                     h->mb.pic.p_fdec[0] + fdec_offset );
 650         /* encode one 4x4 block */
 651         for( i4x4 = 0; i4x4 < 4; i4x4++ )
 652         {
 653             h->quantf.quant_4x4( dct4x4[i4x4], h->quant4_mf[CQM_4PY][i_qp], h->quant4_bias[CQM_4PY][i_qp] );
 654             if( !array_non_zero(dct4x4[i4x4]) )
 655                 continue;
 656             h->zigzagf.scan_4x4( dctscan, dct4x4[i4x4] );
 657             i_decimate_mb += x264_mb_decimate_score( dctscan, 16 );
 658             if( i_decimate_mb >= 6 )
 659                 return 0;
 660         }
 661     }
 662
 663     /* encode chroma */
 664     i_qp = h->mb.i_chroma_qp;
 665     thresh = (x264_lambda2_tab[i_qp] + 32) >> 6;
 666
 667     for( ch = 0; ch < 2; ch++ )
 668     {
 669         uint8_t  *p_src = h->mb.pic.p_fenc[1+ch];
 670         uint8_t  *p_dst = h->mb.pic.p_fdec[1+ch];
 671
 672         if( !b_bidir )
 673         {
 674             h->mc.mc_chroma( h->mb.pic.p_fdec[1+ch],       FDEC_STRIDE,
 675                              h->mb.pic.p_fref[0][0][4+ch], h->mb.pic.i_stride[1+ch],
 676                              mvp[0], mvp[1], 8, 8 );
 677         }
 678
 679         /* there is almost never a termination during chroma, but we can't avoid the check entirely */
 680         /* so instead we check SSD and skip the actual check if the score is low enough. */
 681         if( h->pixf.ssd[PIXEL_8x8]( p_dst, FDEC_STRIDE, p_src, FENC_STRIDE ) < thresh )
 682             continue;
 683
 684         h->dctf.sub8x8_dct( dct4x4, p_src, p_dst );
 685
 686         /* calculate dct DC */
 687         dct2x2[0][0] = dct4x4[0][0][0];
 688         dct2x2[0][1] = dct4x4[1][0][0];
 689         dct2x2[1][0] = dct4x4[2][0][0];
 690         dct2x2[1][1] = dct4x4[3][0][0];
 691         h->dctf.dct2x2dc( dct2x2 );
 692         h->quantf.quant_2x2_dc( dct2x2, h->quant4_mf[CQM_4PC][i_qp][0]>>1, h->quant4_bias[CQM_4PC][i_qp][0]<<1 );
 693         if( array_non_zero(dct2x2) )
 694             return 0;
 695
 696         /* calculate dct coeffs */
 697         for( i4x4 = 0, i_decimate_mb = 0; i4x4 < 4; i4x4++ )
 698         {
 699             h->quantf.quant_4x4( dct4x4[i4x4], h->quant4_mf[CQM_4PC][i_qp], h->quant4_bias[CQM_4PC][i_qp] );
 700             if( !array_non_zero(dct4x4[i4x4]) )
 701                 continue;
 702             h->zigzagf.scan_4x4( dctscan, dct4x4[i4x4] );
 703             i_decimate_mb += x264_mb_decimate_score( dctscan+1, 15 );
 704             if( i_decimate_mb >= 7 )
 705                 return 0;
 706         }
 707     }
 708
 709     h->mb.b_skip_mc = 1;
 710     return 1;
 711 }
 712
 713 /****************************************************************************
 714  * DCT-domain noise reduction / adaptive deadzone
 715  * from libavcodec
 716  ****************************************************************************/
 717
 718 void x264_noise_reduction_update( x264_t *h )
 719 {
 720     int cat, i;
 721     for( cat = 0; cat < 2; cat++ )
 722     {
 723         int size = cat ? 64 : 16;
 724         const uint16_t *weight = cat ? x264_dct8_weight2_tab : x264_dct4_weight2_tab;
 725
 726         if( h->nr_count[cat] > (cat ? (1<<16) : (1<<18)) )
 727         {
 728             for( i = 0; i < size; i++ )
 729                 h->nr_residual_sum[cat][i] >>= 1;
 730             h->nr_count[cat] >>= 1;
 731         }
 732
 733         for( i = 0; i < size; i++ )
 734             h->nr_offset[cat][i] =
 735                 ((uint64_t)h->param.analyse.i_noise_reduction * h->nr_count[cat]
 736                  + h->nr_residual_sum[cat][i]/2)
 737               / ((uint64_t)h->nr_residual_sum[cat][i] * weight[i]/256 + 1);
 738     }
 739 }
 740
 741 /*****************************************************************************
 742  * RD only; 4 calls to this do not make up for one macroblock_encode.
 743  * doesn't transform chroma dc.
 744  *****************************************************************************/
 745 void x264_macroblock_encode_p8x8( x264_t *h, int i8 )
 746 {
 747     int i_qp = h->mb.i_qp;
 748     uint8_t *p_fenc = h->mb.pic.p_fenc[0] + (i8&1)*8 + (i8>>1)*8*FENC_STRIDE;
 749     uint8_t *p_fdec = h->mb.pic.p_fdec[0] + (i8&1)*8 + (i8>>1)*8*FDEC_STRIDE;
 750     int b_decimate = h->sh.i_type == SLICE_TYPE_B || h->param.analyse.b_dct_decimate;
 751     int nnz8x8 = 0;
 752     int ch;
 753
 754     x264_mb_mc_8x8( h, i8 );
 755
 756     if( h->mb.b_lossless )
 757     {
 758         int i4;
 759         for( i4 = i8*4; i4 < i8*4+4; i4++ )
 760         {
 761             h->zigzagf.sub_4x4( h->dct.luma4x4[i4],
 762                                 h->mb.pic.p_fenc[0]+block_idx_xy_fenc[i4],
 763                                 h->mb.pic.p_fdec[0]+block_idx_xy_fdec[i4] );
 764             nnz8x8 |= array_non_zero( h->dct.luma4x4[i4] );
 765         }
 766         for( ch = 0; ch < 2; ch++ )
 767         {
 768             p_fenc = h->mb.pic.p_fenc[1+ch] + (i8&1)*4 + (i8>>1)*4*FENC_STRIDE;
 769             p_fdec = h->mb.pic.p_fdec[1+ch] + (i8&1)*4 + (i8>>1)*4*FDEC_STRIDE;
 770             h->zigzagf.sub_4x4( h->dct.luma4x4[16+i8+ch*4], p_fenc, p_fdec );
 771             h->dct.luma4x4[16+i8+ch*4][0] = 0;
 772         }
 773     }
 774     else
 775     {
 776         if( h->mb.b_transform_8x8 )
 777         {
 778             DECLARE_ALIGNED_16( int16_t dct8x8[8][8] );
 779             h->dctf.sub8x8_dct8( dct8x8, p_fenc, p_fdec );
 780             x264_quant_8x8( h, dct8x8, i_qp, 0 );
 781             h->zigzagf.scan_8x8( h->dct.luma8x8[i8], dct8x8 );
 782
 783             if( b_decimate && !h->mb.b_trellis )
 784                 nnz8x8 = 4 <= x264_mb_decimate_score( h->dct.luma8x8[i8], 64 );
 785             else
 786                 nnz8x8 = array_non_zero( dct8x8 );
 787
 788             if( nnz8x8 )
 789             {
 790                 h->quantf.dequant_8x8( dct8x8, h->dequant8_mf[CQM_8PY], i_qp );
 791                 h->dctf.add8x8_idct8( p_fdec, dct8x8 );
 792             }
 793         }
 794         else
 795         {
 796             int i4;
 797             DECLARE_ALIGNED_16( int16_t dct4x4[4][4][4] );
 798             h->dctf.sub8x8_dct( dct4x4, p_fenc, p_fdec );
 799             for( i4 = 0; i4 < 4; i4++ )
 800                 x264_quant_4x4( h, dct4x4[i4], i_qp, DCT_LUMA_4x4, 0 );
 801
 802             for( i4 = 0; i4 < 4; i4++ )
 803                 h->zigzagf.scan_4x4( h->dct.luma4x4[i8*4+i4], dct4x4[i4] );
 804
 805             if( b_decimate )
 806             {
 807                 int i_decimate_8x8 = 0;
 808                 for( i4 = 0; i4 < 4 && i_decimate_8x8 < 4; i4++ )
 809                     i_decimate_8x8 += x264_mb_decimate_score( h->dct.luma4x4[i8*4+i4], 16 );
 810                 nnz8x8 = 4 <= i_decimate_8x8;
 811             }
 812             else
 813                 nnz8x8 = array_non_zero( dct4x4 );
 814
 815             if( nnz8x8 )
 816             {
 817                 for( i4 = 0; i4 < 4; i4++ )
 818                     h->quantf.dequant_4x4( dct4x4[i4], h->dequant4_mf[CQM_4PY], i_qp );
 819                 h->dctf.add8x8_idct( p_fdec, dct4x4 );
 820             }
 821         }
 822
 823         i_qp = h->mb.i_chroma_qp;
 824
 825         for( ch = 0; ch < 2; ch++ )
 826         {
 827             DECLARE_ALIGNED_16( int16_t dct4x4[4][4] );
 828             p_fenc = h->mb.pic.p_fenc[1+ch] + (i8&1)*4 + (i8>>1)*4*FENC_STRIDE;
 829             p_fdec = h->mb.pic.p_fdec[1+ch] + (i8&1)*4 + (i8>>1)*4*FDEC_STRIDE;
 830
 831             h->dctf.sub4x4_dct( dct4x4, p_fenc, p_fdec );
 832             h->quantf.quant_4x4( dct4x4, h->quant4_mf[CQM_4PC][i_qp], h->quant4_bias[CQM_4PC][i_qp] );
 833             h->zigzagf.scan_4x4( h->dct.luma4x4[16+i8+ch*4], dct4x4 );
 834             h->dct.luma4x4[16+i8+ch*4][0] = 0;
 835             if( array_non_zero( dct4x4 ) )
 836             {
 837                 h->quantf.dequant_4x4( dct4x4, h->dequant4_mf[CQM_4PC], i_qp );
 838                 h->dctf.add4x4_idct( p_fdec, dct4x4 );
 839             }
 840         }
 841     }
 842     h->mb.i_cbp_luma &= ~(1 << i8);
 843     h->mb.i_cbp_luma |= nnz8x8 << i8;
 844     h->mb.i_cbp_chroma = 0x02;
 845 }