aboutsummaryrefslogblamecommitdiffstats
path: root/libavcodec/vc1_mc.c
blob: e3a75d584556ffb84fc3e2ac05ab18a654a95aa3 (plain) (tree)
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
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
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
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798














































































































































































































































































































                                                                                                                 
                           











































































































































































































































































































































































































































































































                                                                                                                                                 

                                                                     
















































































































































                                                                                                                       
/*
 * VC-1 and WMV3 decoder
 * Copyright (c) 2011 Mashiat Sarker Shakkhar
 * Copyright (c) 2006-2007 Konstantin Shishkov
 * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * VC-1 and WMV3 block decoding routines
 */

#include "avcodec.h"
#include "h264chroma.h"
#include "mathops.h"
#include "mpegvideo.h"
#include "vc1.h"

/** Do motion compensation over 1 macroblock
 * Mostly adapted hpel_motion and qpel_motion from mpegvideo.c
 */
void ff_vc1_mc_1mv(VC1Context *v, int dir)
{
    MpegEncContext *s = &v->s;
    H264ChromaContext *h264chroma = &v->h264chroma;
    uint8_t *srcY, *srcU, *srcV;
    int dxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;
    int v_edge_pos = s->v_edge_pos >> v->field_mode;
    int i;
    uint8_t (*luty)[256], (*lutuv)[256];
    int use_ic;

    if ((!v->field_mode ||
         (v->ref_field_type[dir] == 1 && v->cur_field_type == 1)) &&
        !v->s.last_picture.f->data[0])
        return;

    mx = s->mv[dir][0][0];
    my = s->mv[dir][0][1];

    // store motion vectors for further use in B frames
    if (s->pict_type == AV_PICTURE_TYPE_P) {
        for (i = 0; i < 4; i++) {
            s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][0] = mx;
            s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][1] = my;
        }
    }

    uvmx = (mx + ((mx & 3) == 3)) >> 1;
    uvmy = (my + ((my & 3) == 3)) >> 1;
    v->luma_mv[s->mb_x][0] = uvmx;
    v->luma_mv[s->mb_x][1] = uvmy;

    if (v->field_mode &&
        v->cur_field_type != v->ref_field_type[dir]) {
        my   = my   - 2 + 4 * v->cur_field_type;
        uvmy = uvmy - 2 + 4 * v->cur_field_type;
    }

    // fastuvmc shall be ignored for interlaced frame picture
    if (v->fastuvmc && (v->fcm != ILACE_FRAME)) {
        uvmx = uvmx + ((uvmx < 0) ? (uvmx & 1) : -(uvmx & 1));
        uvmy = uvmy + ((uvmy < 0) ? (uvmy & 1) : -(uvmy & 1));
    }
    if (!dir) {
        if (v->field_mode && (v->cur_field_type != v->ref_field_type[dir]) && v->second_field) {
            srcY = s->current_picture.f->data[0];
            srcU = s->current_picture.f->data[1];
            srcV = s->current_picture.f->data[2];
            luty  = v->curr_luty;
            lutuv = v->curr_lutuv;
            use_ic = v->curr_use_ic;
        } else {
            srcY = s->last_picture.f->data[0];
            srcU = s->last_picture.f->data[1];
            srcV = s->last_picture.f->data[2];
            luty  = v->last_luty;
            lutuv = v->last_lutuv;
            use_ic = v->last_use_ic;
        }
    } else {
        srcY = s->next_picture.f->data[0];
        srcU = s->next_picture.f->data[1];
        srcV = s->next_picture.f->data[2];
        luty  = v->next_luty;
        lutuv = v->next_lutuv;
        use_ic = v->next_use_ic;
    }

    if (!srcY || !srcU) {
        av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");
        return;
    }

    src_x   = s->mb_x * 16 + (mx   >> 2);
    src_y   = s->mb_y * 16 + (my   >> 2);
    uvsrc_x = s->mb_x *  8 + (uvmx >> 2);
    uvsrc_y = s->mb_y *  8 + (uvmy >> 2);

    if (v->profile != PROFILE_ADVANCED) {
        src_x   = av_clip(  src_x, -16, s->mb_width  * 16);
        src_y   = av_clip(  src_y, -16, s->mb_height * 16);
        uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);
        uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);
    } else {
        src_x   = av_clip(  src_x, -17, s->avctx->coded_width);
        src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);
        uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);
        uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);
    }

    srcY += src_y   * s->linesize   + src_x;
    srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
    srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

    if (v->field_mode && v->ref_field_type[dir]) {
        srcY += s->current_picture_ptr->f->linesize[0];
        srcU += s->current_picture_ptr->f->linesize[1];
        srcV += s->current_picture_ptr->f->linesize[2];
    }

    /* for grayscale we should not try to read from unknown area */
    if (s->flags & CODEC_FLAG_GRAY) {
        srcU = s->edge_emu_buffer + 18 * s->linesize;
        srcV = s->edge_emu_buffer + 18 * s->linesize;
    }

    if (v->rangeredfrm || use_ic
        || s->h_edge_pos < 22 || v_edge_pos < 22
        || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx&3) - 16 - s->mspel * 3
        || (unsigned)(src_y - 1)        > v_edge_pos    - (my&3) - 16 - 3) {
        uint8_t *uvbuf = s->edge_emu_buffer + 19 * s->linesize;

        srcY -= s->mspel * (1 + s->linesize);
        s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,
                                 s->linesize, s->linesize,
                                 17 + s->mspel * 2, 17 + s->mspel * 2,
                                 src_x - s->mspel, src_y - s->mspel,
                                 s->h_edge_pos, v_edge_pos);
        srcY = s->edge_emu_buffer;
        s->vdsp.emulated_edge_mc(uvbuf, srcU,
                                 s->uvlinesize, s->uvlinesize,
                                 8 + 1, 8 + 1,
                                 uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);
        s->vdsp.emulated_edge_mc(uvbuf + 16, srcV,
                                 s->uvlinesize, s->uvlinesize,
                                 8 + 1, 8 + 1,
                                 uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);
        srcU = uvbuf;
        srcV = uvbuf + 16;
        /* if we deal with range reduction we need to scale source blocks */
        if (v->rangeredfrm) {
            int i, j;
            uint8_t *src, *src2;

            src = srcY;
            for (j = 0; j < 17 + s->mspel * 2; j++) {
                for (i = 0; i < 17 + s->mspel * 2; i++)
                    src[i] = ((src[i] - 128) >> 1) + 128;
                src += s->linesize;
            }
            src  = srcU;
            src2 = srcV;
            for (j = 0; j < 9; j++) {
                for (i = 0; i < 9; i++) {
                    src[i]  = ((src[i]  - 128) >> 1) + 128;
                    src2[i] = ((src2[i] - 128) >> 1) + 128;
                }
                src  += s->uvlinesize;
                src2 += s->uvlinesize;
            }
        }
        /* if we deal with intensity compensation we need to scale source blocks */
        if (use_ic) {
            int i, j;
            uint8_t *src, *src2;

            src = srcY;
            for (j = 0; j < 17 + s->mspel * 2; j++) {
                int f = v->field_mode ? v->ref_field_type[dir] : ((j + src_y - s->mspel) & 1) ;
                for (i = 0; i < 17 + s->mspel * 2; i++)
                    src[i] = luty[f][src[i]];
                src += s->linesize;
            }
            src  = srcU;
            src2 = srcV;
            for (j = 0; j < 9; j++) {
                int f = v->field_mode ? v->ref_field_type[dir] : ((j + uvsrc_y) & 1);
                for (i = 0; i < 9; i++) {
                    src[i]  = lutuv[f][src[i]];
                    src2[i] = lutuv[f][src2[i]];
                }
                src  += s->uvlinesize;
                src2 += s->uvlinesize;
            }
        }
        srcY += s->mspel * (1 + s->linesize);
    }

    if (s->mspel) {
        dxy = ((my & 3) << 2) | (mx & 3);
        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0]    , srcY    , s->linesize, v->rnd);
        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8, srcY + 8, s->linesize, v->rnd);
        srcY += s->linesize * 8;
        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8 * s->linesize    , srcY    , s->linesize, v->rnd);
        v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);
    } else { // hpel mc - always used for luma
        dxy = (my & 2) | ((mx & 2) >> 1);
        if (!v->rnd)
            s->hdsp.put_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);
        else
            s->hdsp.put_no_rnd_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);
    }

    if (s->flags & CODEC_FLAG_GRAY) return;
    /* Chroma MC always uses qpel bilinear */
    uvmx = (uvmx & 3) << 1;
    uvmy = (uvmy & 3) << 1;
    if (!v->rnd) {
        h264chroma->put_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
        h264chroma->put_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);
    } else {
        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);
    }
}

static inline int median4(int a, int b, int c, int d)
{
    if (a < b) {
        if (c < d) return (FFMIN(b, d) + FFMAX(a, c)) / 2;
        else       return (FFMIN(b, c) + FFMAX(a, d)) / 2;
    } else {
        if (c < d) return (FFMIN(a, d) + FFMAX(b, c)) / 2;
        else       return (FFMIN(a, c) + FFMAX(b, d)) / 2;
    }
}

/** Do motion compensation for 4-MV macroblock - luminance block
 */
void ff_vc1_mc_4mv_luma(VC1Context *v, int n, int dir, int avg)
{
    MpegEncContext *s = &v->s;
    uint8_t *srcY;
    int dxy, mx, my, src_x, src_y;
    int off;
    int fieldmv = (v->fcm == ILACE_FRAME) ? v->blk_mv_type[s->block_index[n]] : 0;
    int v_edge_pos = s->v_edge_pos >> v->field_mode;
    uint8_t (*luty)[256];
    int use_ic;

    if ((!v->field_mode ||
         (v->ref_field_type[dir] == 1 && v->cur_field_type == 1)) &&
        !v->s.last_picture.f->data[0])
        return;

    mx = s->mv[dir][n][0];
    my = s->mv[dir][n][1];

    if (!dir) {
        if (v->field_mode && (v->cur_field_type != v->ref_field_type[dir]) && v->second_field) {
            srcY = s->current_picture.f->data[0];
            luty = v->curr_luty;
            use_ic = v->curr_use_ic;
        } else {
            srcY = s->last_picture.f->data[0];
            luty = v->last_luty;
            use_ic = v->last_use_ic;
        }
    } else {
        srcY = s->next_picture.f->data[0];
        luty = v->next_luty;
        use_ic = v->next_use_ic;
    }

    if (!srcY) {
        av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");
        return;
    }

    if (v->field_mode) {
        if (v->cur_field_type != v->ref_field_type[dir])
            my = my - 2 + 4 * v->cur_field_type;
    }

    if (s->pict_type == AV_PICTURE_TYPE_P && n == 3 && v->field_mode) {
        int same_count = 0, opp_count = 0, k;
        int chosen_mv[2][4][2], f;
        int tx = 0, ty = 0;
        for (k = 0; k < 4; k++) {
            f = v->mv_f[0][s->block_index[k] + v->blocks_off];
            chosen_mv[f][f ? opp_count : same_count][0] = s->mv[0][k][0];
            chosen_mv[f][f ? opp_count : same_count][1] = s->mv[0][k][1];
            opp_count  += f;
            same_count += 1 - f;
        }
        f = opp_count > same_count;
        switch (f ? opp_count : same_count) {
        case 4:
            tx = median4(chosen_mv[f][0][0], chosen_mv[f][1][0],
                         chosen_mv[f][2][0], chosen_mv[f][3][0]);
            ty = median4(chosen_mv[f][0][1], chosen_mv[f][1][1],
                         chosen_mv[f][2][1], chosen_mv[f][3][1]);
            break;
        case 3:
            tx = mid_pred(chosen_mv[f][0][0], chosen_mv[f][1][0], chosen_mv[f][2][0]);
            ty = mid_pred(chosen_mv[f][0][1], chosen_mv[f][1][1], chosen_mv[f][2][1]);
            break;
        case 2:
            tx = (chosen_mv[f][0][0] + chosen_mv[f][1][0]) / 2;
            ty = (chosen_mv[f][0][1] + chosen_mv[f][1][1]) / 2;
            break;
        }
        s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = tx;
        s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = ty;
        for (k = 0; k < 4; k++)
            v->mv_f[1][s->block_index[k] + v->blocks_off] = f;
    }

    if (v->fcm == ILACE_FRAME) {  // not sure if needed for other types of picture
        int qx, qy;
        int width  = s->avctx->coded_width;
        int height = s->avctx->coded_height >> 1;
        if (s->pict_type == AV_PICTURE_TYPE_P) {
            s->current_picture.motion_val[1][s->block_index[n] + v->blocks_off][0] = mx;
            s->current_picture.motion_val[1][s->block_index[n] + v->blocks_off][1] = my;
        }
        qx = (s->mb_x * 16) + (mx >> 2);
        qy = (s->mb_y *  8) + (my >> 3);

        if (qx < -17)
            mx -= 4 * (qx + 17);
        else if (qx > width)
            mx -= 4 * (qx - width);
        if (qy < -18)
            my -= 8 * (qy + 18);
        else if (qy > height + 1)
            my -= 8 * (qy - height - 1);
    }

    if ((v->fcm == ILACE_FRAME) && fieldmv)
        off = ((n > 1) ? s->linesize : 0) + (n & 1) * 8;
    else
        off = s->linesize * 4 * (n & 2) + (n & 1) * 8;

    src_x = s->mb_x * 16 + (n & 1) * 8 + (mx >> 2);
    if (!fieldmv)
        src_y = s->mb_y * 16 + (n & 2) * 4 + (my >> 2);
    else
        src_y = s->mb_y * 16 + ((n > 1) ? 1 : 0) + (my >> 2);

    if (v->profile != PROFILE_ADVANCED) {
        src_x = av_clip(src_x, -16, s->mb_width  * 16);
        src_y = av_clip(src_y, -16, s->mb_height * 16);
    } else {
        src_x = av_clip(src_x, -17, s->avctx->coded_width);
        if (v->fcm == ILACE_FRAME) {
            if (src_y & 1)
                src_y = av_clip(src_y, -17, s->avctx->coded_height + 1);
            else
                src_y = av_clip(src_y, -18, s->avctx->coded_height);
        } else {
            src_y = av_clip(src_y, -18, s->avctx->coded_height + 1);
        }
    }

    srcY += src_y * s->linesize + src_x;
    if (v->field_mode && v->ref_field_type[dir])
        srcY += s->current_picture_ptr->f->linesize[0];

    if (fieldmv && !(src_y & 1))
        v_edge_pos--;
    if (fieldmv && (src_y & 1) && src_y < 4)
        src_y--;
    if (v->rangeredfrm || use_ic
        || s->h_edge_pos < 13 || v_edge_pos < 23
        || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx & 3) - 8 - s->mspel * 2
        || (unsigned)(src_y - (s->mspel << fieldmv)) > v_edge_pos - (my & 3) - ((8 + s->mspel * 2) << fieldmv)) {
        srcY -= s->mspel * (1 + (s->linesize << fieldmv));
        /* check emulate edge stride and offset */
        s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,
                                 s->linesize, s->linesize,
                                 9 + s->mspel * 2, (9 + s->mspel * 2) << fieldmv,
                                 src_x - s->mspel, src_y - (s->mspel << fieldmv),
                                 s->h_edge_pos, v_edge_pos);
        srcY = s->edge_emu_buffer;
        /* if we deal with range reduction we need to scale source blocks */
        if (v->rangeredfrm) {
            int i, j;
            uint8_t *src;

            src = srcY;
            for (j = 0; j < 9 + s->mspel * 2; j++) {
                for (i = 0; i < 9 + s->mspel * 2; i++)
                    src[i] = ((src[i] - 128) >> 1) + 128;
                src += s->linesize << fieldmv;
            }
        }
        /* if we deal with intensity compensation we need to scale source blocks */
        if (use_ic) {
            int i, j;
            uint8_t *src;

            src = srcY;
            for (j = 0; j < 9 + s->mspel * 2; j++) {
                int f = v->field_mode ? v->ref_field_type[dir] : (((j<<fieldmv)+src_y - (s->mspel << fieldmv)) & 1);
                for (i = 0; i < 9 + s->mspel * 2; i++)
                    src[i] = luty[f][src[i]];
                src += s->linesize << fieldmv;
            }
        }
        srcY += s->mspel * (1 + (s->linesize << fieldmv));
    }

    if (s->mspel) {
        dxy = ((my & 3) << 2) | (mx & 3);
        if (avg)
            v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize << fieldmv, v->rnd);
        else
            v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize << fieldmv, v->rnd);
    } else { // hpel mc - always used for luma
        dxy = (my & 2) | ((mx & 2) >> 1);
        if (!v->rnd)
            s->hdsp.put_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);
        else
            s->hdsp.put_no_rnd_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);
    }
}

static av_always_inline int get_chroma_mv(int *mvx, int *mvy, int *a, int flag, int *tx, int *ty)
{
    int idx, i;
    static const int count[16] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};

    idx =  ((a[3] != flag) << 3)
         | ((a[2] != flag) << 2)
         | ((a[1] != flag) << 1)
         |  (a[0] != flag);
    if (!idx) {
        *tx = median4(mvx[0], mvx[1], mvx[2], mvx[3]);
        *ty = median4(mvy[0], mvy[1], mvy[2], mvy[3]);
        return 4;
    } else if (count[idx] == 1) {
        switch (idx) {
        case 0x1:
            *tx = mid_pred(mvx[1], mvx[2], mvx[3]);
            *ty = mid_pred(mvy[1], mvy[2], mvy[3]);
            return 3;
        case 0x2:
            *tx = mid_pred(mvx[0], mvx[2], mvx[3]);
            *ty = mid_pred(mvy[0], mvy[2], mvy[3]);
            return 3;
        case 0x4:
            *tx = mid_pred(mvx[0], mvx[1], mvx[3]);
            *ty = mid_pred(mvy[0], mvy[1], mvy[3]);
            return 3;
        case 0x8:
            *tx = mid_pred(mvx[0], mvx[1], mvx[2]);
            *ty = mid_pred(mvy[0], mvy[1], mvy[2]);
            return 3;
        }
    } else if (count[idx] == 2) {
        int t1 = 0, t2 = 0;
        for (i = 0; i < 3; i++)
            if (!a[i]) {
                t1 = i;
                break;
            }
        for (i = t1 + 1; i < 4; i++)
            if (!a[i]) {
                t2 = i;
                break;
            }
        *tx = (mvx[t1] + mvx[t2]) / 2;
        *ty = (mvy[t1] + mvy[t2]) / 2;
        return 2;
    } else {
        return 0;
    }
    return -1;
}

/** Do motion compensation for 4-MV macroblock - both chroma blocks
 */
void ff_vc1_mc_4mv_chroma(VC1Context *v, int dir)
{
    MpegEncContext *s = &v->s;
    H264ChromaContext *h264chroma = &v->h264chroma;
    uint8_t *srcU, *srcV;
    int uvmx, uvmy, uvsrc_x, uvsrc_y;
    int k, tx = 0, ty = 0;
    int mvx[4], mvy[4], intra[4], mv_f[4];
    int valid_count;
    int chroma_ref_type = v->cur_field_type;
    int v_edge_pos = s->v_edge_pos >> v->field_mode;
    uint8_t (*lutuv)[256];
    int use_ic;

    if (!v->field_mode && !v->s.last_picture.f->data[0])
        return;
    if (s->flags & CODEC_FLAG_GRAY)
        return;

    for (k = 0; k < 4; k++) {
        mvx[k] = s->mv[dir][k][0];
        mvy[k] = s->mv[dir][k][1];
        intra[k] = v->mb_type[0][s->block_index[k]];
        if (v->field_mode)
            mv_f[k] = v->mv_f[dir][s->block_index[k] + v->blocks_off];
    }

    /* calculate chroma MV vector from four luma MVs */
    if (!v->field_mode || (v->field_mode && !v->numref)) {
        valid_count = get_chroma_mv(mvx, mvy, intra, 0, &tx, &ty);
        chroma_ref_type = v->reffield;
        if (!valid_count) {
            s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;
            s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;
            v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;
            return; //no need to do MC for intra blocks
        }
    } else {
        int dominant = 0;
        if (mv_f[0] + mv_f[1] + mv_f[2] + mv_f[3] > 2)
            dominant = 1;
        valid_count = get_chroma_mv(mvx, mvy, mv_f, dominant, &tx, &ty);
        if (dominant)
            chroma_ref_type = !v->cur_field_type;
    }
    if (v->field_mode && chroma_ref_type == 1 && v->cur_field_type == 1 && !v->s.last_picture.f->data[0])
        return;
    s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = tx;
    s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = ty;
    uvmx = (tx + ((tx & 3) == 3)) >> 1;
    uvmy = (ty + ((ty & 3) == 3)) >> 1;

    v->luma_mv[s->mb_x][0] = uvmx;
    v->luma_mv[s->mb_x][1] = uvmy;

    if (v->fastuvmc) {
        uvmx = uvmx + ((uvmx < 0) ? (uvmx & 1) : -(uvmx & 1));
        uvmy = uvmy + ((uvmy < 0) ? (uvmy & 1) : -(uvmy & 1));
    }
    // Field conversion bias
    if (v->cur_field_type != chroma_ref_type)
        uvmy += 2 - 4 * chroma_ref_type;

    uvsrc_x = s->mb_x * 8 + (uvmx >> 2);
    uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

    if (v->profile != PROFILE_ADVANCED) {
        uvsrc_x = av_clip(uvsrc_x, -8, s->mb_width  * 8);
        uvsrc_y = av_clip(uvsrc_y, -8, s->mb_height * 8);
    } else {
        uvsrc_x = av_clip(uvsrc_x, -8, s->avctx->coded_width  >> 1);
        uvsrc_y = av_clip(uvsrc_y, -8, s->avctx->coded_height >> 1);
    }

    if (!dir) {
        if (v->field_mode && (v->cur_field_type != chroma_ref_type) && v->second_field) {
            srcU = s->current_picture.f->data[1];
            srcV = s->current_picture.f->data[2];
            lutuv = v->curr_lutuv;
            use_ic = v->curr_use_ic;
        } else {
            srcU = s->last_picture.f->data[1];
            srcV = s->last_picture.f->data[2];
            lutuv = v->last_lutuv;
            use_ic = v->last_use_ic;
        }
    } else {
        srcU = s->next_picture.f->data[1];
        srcV = s->next_picture.f->data[2];
        lutuv = v->next_lutuv;
        use_ic = v->next_use_ic;
    }

    if (!srcU) {
        av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");
        return;
    }

    srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
    srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

    if (v->field_mode) {
        if (chroma_ref_type) {
            srcU += s->current_picture_ptr->f->linesize[1];
            srcV += s->current_picture_ptr->f->linesize[2];
        }
    }

    if (v->rangeredfrm || use_ic
        || s->h_edge_pos < 18 || v_edge_pos < 18
        || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 9
        || (unsigned)uvsrc_y > (v_edge_pos    >> 1) - 9) {
        s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcU,
                                 s->uvlinesize, s->uvlinesize,
                                 8 + 1, 8 + 1, uvsrc_x, uvsrc_y,
                                 s->h_edge_pos >> 1, v_edge_pos >> 1);
        s->vdsp.emulated_edge_mc(s->edge_emu_buffer + 16, srcV,
                                 s->uvlinesize, s->uvlinesize,
                                 8 + 1, 8 + 1, uvsrc_x, uvsrc_y,
                                 s->h_edge_pos >> 1, v_edge_pos >> 1);
        srcU = s->edge_emu_buffer;
        srcV = s->edge_emu_buffer + 16;

        /* if we deal with range reduction we need to scale source blocks */
        if (v->rangeredfrm) {
            int i, j;
            uint8_t *src, *src2;

            src  = srcU;
            src2 = srcV;
            for (j = 0; j < 9; j++) {
                for (i = 0; i < 9; i++) {
                    src[i]  = ((src[i]  - 128) >> 1) + 128;
                    src2[i] = ((src2[i] - 128) >> 1) + 128;
                }
                src  += s->uvlinesize;
                src2 += s->uvlinesize;
            }
        }
        /* if we deal with intensity compensation we need to scale source blocks */
        if (use_ic) {
            int i, j;
            uint8_t *src, *src2;

            src  = srcU;
            src2 = srcV;
            for (j = 0; j < 9; j++) {
                int f = v->field_mode ? chroma_ref_type : ((j + uvsrc_y) & 1);
                for (i = 0; i < 9; i++) {
                    src[i]  = lutuv[f][src[i]];
                    src2[i] = lutuv[f][src2[i]];
                }
                src  += s->uvlinesize;
                src2 += s->uvlinesize;
            }
        }
    }

    /* Chroma MC always uses qpel bilinear */
    uvmx = (uvmx & 3) << 1;
    uvmy = (uvmy & 3) << 1;
    if (!v->rnd) {
        h264chroma->put_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
        h264chroma->put_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);
    } else {
        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);
        v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);
    }
}

/** Do motion compensation for 4-MV interlaced frame chroma macroblock (both U and V)
 */
void ff_vc1_mc_4mv_chroma4(VC1Context *v, int dir, int dir2, int avg)
{
    MpegEncContext *s = &v->s;
    H264ChromaContext *h264chroma = &v->h264chroma;
    uint8_t *srcU, *srcV;
    int uvsrc_x, uvsrc_y;
    int uvmx_field[4], uvmy_field[4];
    int i, off, tx, ty;
    int fieldmv = v->blk_mv_type[s->block_index[0]];
    static const int s_rndtblfield[16] = { 0, 0, 1, 2, 4, 4, 5, 6, 2, 2, 3, 8, 6, 6, 7, 12 };
    int v_dist = fieldmv ? 1 : 4; // vertical offset for lower sub-blocks
    int v_edge_pos = s->v_edge_pos >> 1;
    int use_ic;
    uint8_t (*lutuv)[256];

    if (s->flags & CODEC_FLAG_GRAY)
        return;

    for (i = 0; i < 4; i++) {
        int d = i < 2 ? dir: dir2;
        tx = s->mv[d][i][0];
        uvmx_field[i] = (tx + ((tx & 3) == 3)) >> 1;
        ty = s->mv[d][i][1];
        if (fieldmv)
            uvmy_field[i] = (ty >> 4) * 8 + s_rndtblfield[ty & 0xF];
        else
            uvmy_field[i] = (ty + ((ty & 3) == 3)) >> 1;
    }

    for (i = 0; i < 4; i++) {
        off = (i & 1) * 4 + ((i & 2) ? v_dist * s->uvlinesize : 0);
        uvsrc_x = s->mb_x * 8 +  (i & 1) * 4           + (uvmx_field[i] >> 2);
        uvsrc_y = s->mb_y * 8 + ((i & 2) ? v_dist : 0) + (uvmy_field[i] >> 2);
        // FIXME: implement proper pull-back (see vc1cropmv.c, vc1CROPMV_ChromaPullBack())
        uvsrc_x = av_clip(uvsrc_x, -8, s->avctx->coded_width  >> 1);
        uvsrc_y = av_clip(uvsrc_y, -8, s->avctx->coded_height >> 1);
        if (i < 2 ? dir : dir2) {
            srcU = s->next_picture.f->data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;
            srcV = s->next_picture.f->data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;
            lutuv  = v->next_lutuv;
            use_ic = v->next_use_ic;
        } else {
            srcU = s->last_picture.f->data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;
            srcV = s->last_picture.f->data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;
            lutuv  = v->last_lutuv;
            use_ic = v->last_use_ic;
        }
        uvmx_field[i] = (uvmx_field[i] & 3) << 1;
        uvmy_field[i] = (uvmy_field[i] & 3) << 1;

        if (fieldmv && !(uvsrc_y & 1))
            v_edge_pos--;
        if (fieldmv && (uvsrc_y & 1) && uvsrc_y < 2)
            uvsrc_y--;
        if (use_ic
            || s->h_edge_pos < 10 || v_edge_pos < (5 << fieldmv)
            || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 5
            || (unsigned)uvsrc_y > v_edge_pos - (5 << fieldmv)) {
            s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcU,
                                     s->uvlinesize, s->uvlinesize,
                                     5, (5 << fieldmv), uvsrc_x, uvsrc_y,
                                     s->h_edge_pos >> 1, v_edge_pos);
            s->vdsp.emulated_edge_mc(s->edge_emu_buffer + 16, srcV,
                                     s->uvlinesize, s->uvlinesize,
                                     5, (5 << fieldmv), uvsrc_x, uvsrc_y,
                                     s->h_edge_pos >> 1, v_edge_pos);
            srcU = s->edge_emu_buffer;
            srcV = s->edge_emu_buffer + 16;

            /* if we deal with intensity compensation we need to scale source blocks */
            if (use_ic) {
                int i, j;
                uint8_t *src, *src2;

                src  = srcU;
                src2 = srcV;
                for (j = 0; j < 5; j++) {
                    int f = (uvsrc_y + (j << fieldmv)) & 1;
                    for (i = 0; i < 5; i++) {
                        src[i]  = lutuv[f][src[i]];
                        src2[i] = lutuv[f][src2[i]];
                    }
                    src  += s->uvlinesize << fieldmv;
                    src2 += s->uvlinesize << fieldmv;
                }
            }
        }
        if (avg) {
            if (!v->rnd) {
                h264chroma->avg_h264_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
                h264chroma->avg_h264_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
            } else {
                v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
                v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
            }
        } else {
            if (!v->rnd) {
                h264chroma->put_h264_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
                h264chroma->put_h264_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
            } else {
                v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
                v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);
            }
        }
    }
}

/** Motion compensation for direct or interpolated blocks in B-frames
 */
void ff_vc1_interp_mc(VC1Context *v)
{
    MpegEncContext *s = &v->s;
    H264ChromaContext *h264chroma = &v->h264chroma;
    uint8_t *srcY, *srcU, *srcV;
    int dxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;
    int off, off_uv;
    int v_edge_pos = s->v_edge_pos >> v->field_mode;
    int use_ic = v->next_use_ic;

    if (!v->field_mode && !v->s.next_picture.f->data[0])
        return;

    mx   = s->mv[1][0][0];
    my   = s->mv[1][0][1];
    uvmx = (mx + ((mx & 3) == 3)) >> 1;
    uvmy = (my + ((my & 3) == 3)) >> 1;
    if (v->field_mode && v->cur_field_type != v->ref_field_type[1]) {
        my   = my   - 2 + 4 * v->cur_field_type;
        uvmy = uvmy - 2 + 4 * v->cur_field_type;
    }
    if (v->fastuvmc) {
        uvmx = uvmx + ((uvmx < 0) ? -(uvmx & 1) : (uvmx & 1));
        uvmy = uvmy + ((uvmy < 0) ? -(uvmy & 1) : (uvmy & 1));
    }
    srcY = s->next_picture.f->data[0];
    srcU = s->next_picture.f->data[1];
    srcV = s->next_picture.f->data[2];

    src_x   = s->mb_x * 16 + (mx   >> 2);
    src_y   = s->mb_y * 16 + (my   >> 2);
    uvsrc_x = s->mb_x *  8 + (uvmx >> 2);
    uvsrc_y = s->mb_y *  8 + (uvmy >> 2);

    if (v->profile != PROFILE_ADVANCED) {
        src_x   = av_clip(  src_x, -16, s->mb_width  * 16);
        src_y   = av_clip(  src_y, -16, s->mb_height * 16);
        uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);
        uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);
    } else {
        src_x   = av_clip(  src_x, -17, s->avctx->coded_width);
        src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);
        uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);
        uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);
    }

    srcY += src_y   * s->linesize   + src_x;
    srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
    srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

    if (v->field_mode && v->ref_field_type[1]) {
        srcY += s->current_picture_ptr->f->linesize[0];
        srcU += s->current_picture_ptr->f->linesize[1];
        srcV += s->current_picture_ptr->f->linesize[2];
    }

    /* for grayscale we should not try to read from unknown area */
    if (s->flags & CODEC_FLAG_GRAY) {
        srcU = s->edge_emu_buffer + 18 * s->linesize;
        srcV = s->edge_emu_buffer + 18 * s->linesize;
    }

    if (v->rangeredfrm || s->h_edge_pos < 22 || v_edge_pos < 22 || use_ic
        || (unsigned)(src_x - 1) > s->h_edge_pos - (mx & 3) - 16 - 3
        || (unsigned)(src_y - 1) > v_edge_pos    - (my & 3) - 16 - 3) {
        uint8_t *uvbuf = s->edge_emu_buffer + 19 * s->linesize;

        srcY -= s->mspel * (1 + s->linesize);
        s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,
                                 s->linesize, s->linesize,
                                 17 + s->mspel * 2, 17 + s->mspel * 2,
                                 src_x - s->mspel, src_y - s->mspel,
                                 s->h_edge_pos, v_edge_pos);
        srcY = s->edge_emu_buffer;
        s->vdsp.emulated_edge_mc(uvbuf, srcU,
                                 s->uvlinesize, s->uvlinesize,
                                 8 + 1, 8 + 1,
                                 uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);
        s->vdsp.emulated_edge_mc(uvbuf + 16, srcV,
                                 s->uvlinesize, s->uvlinesize,
                                 8 + 1, 8 + 1,
                                 uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);
        srcU = uvbuf;
        srcV = uvbuf + 16;
        /* if we deal with range reduction we need to scale source blocks */
        if (v->rangeredfrm) {
            int i, j;
            uint8_t *src, *src2;

            src = srcY;
            for (j = 0; j < 17 + s->mspel * 2; j++) {
                for (i = 0; i < 17 + s->mspel * 2; i++)
                    src[i] = ((src[i] - 128) >> 1) + 128;
                src += s->linesize;
            }
            src = srcU;
            src2 = srcV;
            for (j = 0; j < 9; j++) {
                for (i = 0; i < 9; i++) {
                    src[i]  = ((src[i]  - 128) >> 1) + 128;
                    src2[i] = ((src2[i] - 128) >> 1) + 128;
                }
                src  += s->uvlinesize;
                src2 += s->uvlinesize;
            }
        }

        if (use_ic) {
            uint8_t (*luty )[256] = v->next_luty;
            uint8_t (*lutuv)[256] = v->next_lutuv;
            int i, j;
            uint8_t *src, *src2;

            src = srcY;
            for (j = 0; j < 17 + s->mspel * 2; j++) {
                int f = v->field_mode ? v->ref_field_type[1] : ((j+src_y - s->mspel) & 1);
                for (i = 0; i < 17 + s->mspel * 2; i++)
                    src[i] = luty[f][src[i]];
                src += s->linesize;
            }
            src  = srcU;
            src2 = srcV;
            for (j = 0; j < 9; j++) {
                int f = v->field_mode ? v->ref_field_type[1] : ((j+uvsrc_y) & 1);
                for (i = 0; i < 9; i++) {
                    src[i]  = lutuv[f][src[i]];
                    src2[i] = lutuv[f][src2[i]];
                }
                src  += s->uvlinesize;
                src2 += s->uvlinesize;
            }
        }
        srcY += s->mspel * (1 + s->linesize);
    }

    off    = 0;
    off_uv = 0;

    if (s->mspel) {
        dxy = ((my & 3) << 2) | (mx & 3);
        v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off    , srcY    , s->linesize, v->rnd);
        v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8, srcY + 8, s->linesize, v->rnd);
        srcY += s->linesize * 8;
        v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize    , srcY    , s->linesize, v->rnd);
        v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);
    } else { // hpel mc
        dxy = (my & 2) | ((mx & 2) >> 1);

        if (!v->rnd)
            s->hdsp.avg_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);
        else
            s->hdsp.avg_no_rnd_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize, 16);
    }

    if (s->flags & CODEC_FLAG_GRAY) return;
    /* Chroma MC always uses qpel blilinear */
    uvmx = (uvmx & 3) << 1;
    uvmy = (uvmy & 3) << 1;
    if (!v->rnd) {
        h264chroma->avg_h264_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);
        h264chroma->avg_h264_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);
    } else {
        v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);
        v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);
    }
}