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FFmpeg/libavcodec/vc1_block.c

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  1. /*

  2.  * VC-1 and WMV3 decoder

  3.  * Copyright (c) 2011 Mashiat Sarker Shakkhar

  4.  * Copyright (c) 2006-2007 Konstantin Shishkov

  5.  * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer

  6.  *

  7.  * This file is part of FFmpeg.

  8.  *

  9.  * FFmpeg is free software; you can redistribute it and/or

  10.  * modify it under the terms of the GNU Lesser General Public

  11.  * License as published by the Free Software Foundation; either

  12.  * version 2.1 of the License, or (at your option) any later version.

  13.  *

  14.  * FFmpeg is distributed in the hope that it will be useful,

  15.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  16.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  17.  * Lesser General Public License for more details.

  18.  *

  19.  * You should have received a copy of the GNU Lesser General Public

  20.  * License along with FFmpeg; if not, write to the Free Software

  21.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  22.  */

  23. 

  24. /**

  25.  * @file

  26.  * VC-1 and WMV3 block decoding routines

  27.  */

  28. 

  29. #include "avcodec.h"

  30. #include "mpegutils.h"

  31. #include "mpegvideo.h"

  32. #include "msmpeg4data.h"

  33. #include "unary.h"

  34. #include "vc1.h"

  35. #include "vc1_pred.h"

  36. #include "vc1acdata.h"

  37. #include "vc1data.h"

  38. 

  39. #define MB_INTRA_VLC_BITS 9

  40. #define DC_VLC_BITS 9

  41. 

  42. // offset tables for interlaced picture MVDATA decoding

  43. static const uint8_t offset_table[2][9] = {

  44.     {  0,  1,  2,  4,  8, 16, 32,  64, 128 },

  45.     {  0,  1,  3,  7, 15, 31, 63, 127, 255 },

  46. };

  47. 

  48. /***********************************************************************/

  49. /**

  50.  * @name VC-1 Bitplane decoding

  51.  * @see 8.7, p56

  52.  * @{

  53.  */

  54. 

  55. 

  56. static inline void init_block_index(VC1Context *v)

  57. {

  58.     MpegEncContext *s = &v->s;

  59.     ff_init_block_index(s);

  60.     if (v->field_mode && !(v->second_field ^ v->tff)) {

  61.         s->dest[0] += s->current_picture_ptr->f->linesize[0];

  62.         s->dest[1] += s->current_picture_ptr->f->linesize[1];

  63.         s->dest[2] += s->current_picture_ptr->f->linesize[2];

  64.     }

  65. }

  66. 

  67. /** @} */ //Bitplane group

  68. 

  69. static void vc1_put_signed_blocks_clamped(VC1Context *v)

  70. {

  71.     MpegEncContext *s = &v->s;

  72.     int topleft_mb_pos, top_mb_pos;

  73.     int stride_y, fieldtx = 0;

  74.     int v_dist;

  75. 

  76.     /* The put pixels loop is always one MB row behind the decoding loop,

  77.      * because we can only put pixels when overlap filtering is done, and

  78.      * for filtering of the bottom edge of a MB, we need the next MB row

  79.      * present as well.

  80.      * Within the row, the put pixels loop is also one MB col behind the

  81.      * decoding loop. The reason for this is again, because for filtering

  82.      * of the right MB edge, we need the next MB present. */

  83.     if (!s->first_slice_line) {

  84.         if (s->mb_x) {

  85.             topleft_mb_pos = (s->mb_y - 1) * s->mb_stride + s->mb_x - 1;

  86.             if (v->fcm == ILACE_FRAME)

  87.                 fieldtx = v->fieldtx_plane[topleft_mb_pos];

  88.             stride_y       = s->linesize << fieldtx;

  89.             v_dist         = (16 - fieldtx) >> (fieldtx == 0);

  90.             s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][0],

  91.                                               s->dest[0] - 16 * s->linesize - 16,

  92.                                               stride_y);

  93.             s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][1],

  94.                                               s->dest[0] - 16 * s->linesize - 8,

  95.                                               stride_y);

  96.             s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][2],

  97.                                               s->dest[0] - v_dist * s->linesize - 16,

  98.                                               stride_y);

  99.             s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][3],

  100.                                               s->dest[0] - v_dist * s->linesize - 8,

  101.                                               stride_y);

  102.             if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY)) {

  103.             s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][4],

  104.                                               s->dest[1] - 8 * s->uvlinesize - 8,

  105.                                               s->uvlinesize);

  106.             s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][5],

  107.                                               s->dest[2] - 8 * s->uvlinesize - 8,

  108.                                               s->uvlinesize);

  109.             }

  110.         }

  111.         if (s->mb_x == s->mb_width - 1) {

  112.             top_mb_pos = (s->mb_y - 1) * s->mb_stride + s->mb_x;

  113.             if (v->fcm == ILACE_FRAME)

  114.                 fieldtx = v->fieldtx_plane[top_mb_pos];

  115.             stride_y   = s->linesize << fieldtx;

  116.             v_dist     = fieldtx ? 15 : 8;

  117.             s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][0],

  118.                                               s->dest[0] - 16 * s->linesize,

  119.                                               stride_y);

  120.             s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][1],

  121.                                               s->dest[0] - 16 * s->linesize + 8,

  122.                                               stride_y);

  123.             s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][2],

  124.                                               s->dest[0] - v_dist * s->linesize,

  125.                                               stride_y);

  126.             s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][3],

  127.                                               s->dest[0] - v_dist * s->linesize + 8,

  128.                                               stride_y);

  129.             if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY)) {

  130.             s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][4],

  131.                                               s->dest[1] - 8 * s->uvlinesize,

  132.                                               s->uvlinesize);

  133.             s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][5],

  134.                                               s->dest[2] - 8 * s->uvlinesize,

  135.                                               s->uvlinesize);

  136.             }

  137.         }

  138.     }

  139. 

  140. #define inc_blk_idx(idx) do { \

  141.         idx++; \

  142.         if (idx >= v->n_allocated_blks) \

  143.             idx = 0; \

  144.     } while (0)

  145. 

  146.     inc_blk_idx(v->topleft_blk_idx);

  147.     inc_blk_idx(v->top_blk_idx);

  148.     inc_blk_idx(v->left_blk_idx);

  149.     inc_blk_idx(v->cur_blk_idx);

  150. }

  151. 

  152. /***********************************************************************/

  153. /**

  154.  * @name VC-1 Block-level functions

  155.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  156.  * @{

  157.  */

  158. 

  159. /**

  160.  * @def GET_MQUANT

  161.  * @brief Get macroblock-level quantizer scale

  162.  */

  163. #define GET_MQUANT()                                           \

  164.     if (v->dquantfrm) {                                        \

  165.         int edges = 0;                                         \

  166.         if (v->dqprofile == DQPROFILE_ALL_MBS) {               \

  167.             if (v->dqbilevel) {                                \

  168.                 mquant = (get_bits1(gb)) ? v->altpq : v->pq;   \

  169.             } else {                                           \

  170.                 mqdiff = get_bits(gb, 3);                      \

  171.                 if (mqdiff != 7)                               \

  172.                     mquant = v->pq + mqdiff;                   \

  173.                 else                                           \

  174.                     mquant = get_bits(gb, 5);                  \

  175.             }                                                  \

  176.         }                                                      \

  177.         if (v->dqprofile == DQPROFILE_SINGLE_EDGE)             \

  178.             edges = 1 << v->dqsbedge;                          \

  179.         else if (v->dqprofile == DQPROFILE_DOUBLE_EDGES)       \

  180.             edges = (3 << v->dqsbedge) % 15;                   \

  181.         else if (v->dqprofile == DQPROFILE_FOUR_EDGES)         \

  182.             edges = 15;                                        \

  183.         if ((edges&1) && !s->mb_x)                             \

  184.             mquant = v->altpq;                                 \

  185.         if ((edges&2) && s->first_slice_line)                  \

  186.             mquant = v->altpq;                                 \

  187.         if ((edges&4) && s->mb_x == (s->mb_width - 1))         \

  188.             mquant = v->altpq;                                 \

  189.         if ((edges&8) && s->mb_y == (s->mb_height - 1))        \

  190.             mquant = v->altpq;                                 \

  191.         if (!mquant || mquant > 31) {                          \

  192.             av_log(v->s.avctx, AV_LOG_ERROR,                   \

  193.                    "Overriding invalid mquant %d\n", mquant);  \

  194.             mquant = 1;                                        \

  195.         }                                                      \

  196.     }

  197. 

  198. /**

  199.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  200.  * @brief Get MV differentials

  201.  * @see MVDATA decoding from 8.3.5.2, p(1)20

  202.  * @param _dmv_x Horizontal differential for decoded MV

  203.  * @param _dmv_y Vertical differential for decoded MV

  204.  */

  205. #define GET_MVDATA(_dmv_x, _dmv_y)                                      \

  206.     index = 1 + get_vlc2(gb, ff_vc1_mv_diff_vlc[s->mv_table_index].table, \

  207.                          VC1_MV_DIFF_VLC_BITS, 2);                      \

  208.     if (index > 36) {                                                   \

  209.         mb_has_coeffs = 1;                                              \

  210.         index -= 37;                                                    \

  211.     } else                                                              \

  212.         mb_has_coeffs = 0;                                              \

  213.     s->mb_intra = 0;                                                    \

  214.     if (!index) {                                                       \

  215.         _dmv_x = _dmv_y = 0;                                            \

  216.     } else if (index == 35) {                                           \

  217.         _dmv_x = get_bits(gb, v->k_x - 1 + s->quarter_sample);          \

  218.         _dmv_y = get_bits(gb, v->k_y - 1 + s->quarter_sample);          \

  219.     } else if (index == 36) {                                           \

  220.         _dmv_x = 0;                                                     \

  221.         _dmv_y = 0;                                                     \

  222.         s->mb_intra = 1;                                                \

  223.     } else {                                                            \

  224.         index1 = index % 6;                                             \

  225.         _dmv_x = offset_table[1][index1];                               \

  226.         val = size_table[index1] - (!s->quarter_sample && index1 == 5); \

  227.         if (val > 0) {                                                  \

  228.             val = get_bits(gb, val);                                    \

  229.             sign = 0 - (val & 1);                                       \

  230.             _dmv_x = (sign ^ ((val >> 1) + _dmv_x)) - sign;             \

  231.         }                                                               \

  232.                                                                         \

  233.         index1 = index / 6;                                             \

  234.         _dmv_y = offset_table[1][index1];                               \

  235.         val = size_table[index1] - (!s->quarter_sample && index1 == 5); \

  236.         if (val > 0) {                                                  \

  237.             val = get_bits(gb, val);                                    \

  238.             sign = 0 - (val & 1);                                       \

  239.             _dmv_y = (sign ^ ((val >> 1) + _dmv_y)) - sign;             \

  240.         }                                                               \

  241.     }

  242. 

  243. static av_always_inline void get_mvdata_interlaced(VC1Context *v, int *dmv_x,

  244.                                                    int *dmv_y, int *pred_flag)

  245. {

  246.     int index, index1;

  247.     int extend_x, extend_y;

  248.     GetBitContext *gb = &v->s.gb;

  249.     int bits, esc;

  250.     int val, sign;

  251. 

  252.     if (v->numref) {

  253.         bits = VC1_2REF_MVDATA_VLC_BITS;

  254.         esc  = 125;

  255.     } else {

  256.         bits = VC1_1REF_MVDATA_VLC_BITS;

  257.         esc  = 71;

  258.     }

  259.     extend_x = v->dmvrange & 1;

  260.     extend_y = (v->dmvrange >> 1) & 1;

  261.     index = get_vlc2(gb, v->imv_vlc->table, bits, 3);

  262.     if (index == esc) {

  263.         *dmv_x = get_bits(gb, v->k_x);

  264.         *dmv_y = get_bits(gb, v->k_y);

  265.         if (v->numref) {

  266.             if (pred_flag)

  267.                 *pred_flag = *dmv_y & 1;

  268.             *dmv_y = (*dmv_y + (*dmv_y & 1)) >> 1;

  269.         }

  270.     }

  271.     else {

  272.         av_assert0(index < esc);

  273.         index1 = (index + 1) % 9;

  274.         if (index1 != 0) {

  275.             val    = get_bits(gb, index1 + extend_x);

  276.             sign   = 0 - (val & 1);

  277.             *dmv_x = (sign ^ ((val >> 1) + offset_table[extend_x][index1])) - sign;

  278.         } else

  279.             *dmv_x = 0;

  280.         index1 = (index + 1) / 9;

  281.         if (index1 > v->numref) {

  282.             val    = get_bits(gb, (index1 >> v->numref) + extend_y);

  283.             sign   = 0 - (val & 1);

  284.             *dmv_y = (sign ^ ((val >> 1) + offset_table[extend_y][index1 >> v->numref])) - sign;

  285.         } else

  286.             *dmv_y = 0;

  287.         if (v->numref && pred_flag)

  288.             *pred_flag = index1 & 1;

  289.     }

  290. }

  291. 

  292. /** Reconstruct motion vector for B-frame and do motion compensation

  293.  */

  294. static inline void vc1_b_mc(VC1Context *v, int dmv_x[2], int dmv_y[2],

  295.                             int direct, int mode)

  296. {

  297.     if (direct) {

  298.         ff_vc1_mc_1mv(v, 0);

  299.         ff_vc1_interp_mc(v);

  300.         return;

  301.     }

  302.     if (mode == BMV_TYPE_INTERPOLATED) {

  303.         ff_vc1_mc_1mv(v, 0);

  304.         ff_vc1_interp_mc(v);

  305.         return;

  306.     }

  307. 

  308.     ff_vc1_mc_1mv(v, (mode == BMV_TYPE_BACKWARD));

  309. }

  310. 

  311. /** Get predicted DC value for I-frames only

  312.  * prediction dir: left=0, top=1

  313.  * @param s MpegEncContext

  314.  * @param overlap flag indicating that overlap filtering is used

  315.  * @param pq integer part of picture quantizer

  316.  * @param[in] n block index in the current MB

  317.  * @param dc_val_ptr Pointer to DC predictor

  318.  * @param dir_ptr Prediction direction for use in AC prediction

  319.  */

  320. static inline int vc1_i_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  321.                                 int16_t **dc_val_ptr, int *dir_ptr)

  322. {

  323.     int a, b, c, wrap, pred, scale;

  324.     int16_t *dc_val;

  325.     static const uint16_t dcpred[32] = {

  326.         -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  327.              114,  102,   93,   85,   79,   73,   68,   64,

  328.               60,   57,   54,   51,   49,   47,   45,   43,

  329.               41,   39,   38,   37,   35,   34,   33

  330.     };

  331. 

  332.     /* find prediction - wmv3_dc_scale always used here in fact */

  333.     if (n < 4) scale = s->y_dc_scale;

  334.     else       scale = s->c_dc_scale;

  335. 

  336.     wrap   = s->block_wrap[n];

  337.     dc_val = s->dc_val[0] + s->block_index[n];

  338. 

  339.     /* B A

  340.      * C X

  341.      */

  342.     c = dc_val[ - 1];

  343.     b = dc_val[ - 1 - wrap];

  344.     a = dc_val[ - wrap];

  345. 

  346.     if (pq < 9 || !overlap) {

  347.         /* Set outer values */

  348.         if (s->first_slice_line && (n != 2 && n != 3))

  349.             b = a = dcpred[scale];

  350.         if (s->mb_x == 0 && (n != 1 && n != 3))

  351.             b = c = dcpred[scale];

  352.     } else {

  353.         /* Set outer values */

  354.         if (s->first_slice_line && (n != 2 && n != 3))

  355.             b = a = 0;

  356.         if (s->mb_x == 0 && (n != 1 && n != 3))

  357.             b = c = 0;

  358.     }

  359. 

  360.     if (abs(a - b) <= abs(b - c)) {

  361.         pred     = c;

  362.         *dir_ptr = 1; // left

  363.     } else {

  364.         pred     = a;

  365.         *dir_ptr = 0; // top

  366.     }

  367. 

  368.     /* update predictor */

  369.     *dc_val_ptr = &dc_val[0];

  370.     return pred;

  371. }

  372. 

  373. 

  374. /** Get predicted DC value

  375.  * prediction dir: left=0, top=1

  376.  * @param s MpegEncContext

  377.  * @param overlap flag indicating that overlap filtering is used

  378.  * @param pq integer part of picture quantizer

  379.  * @param[in] n block index in the current MB

  380.  * @param a_avail flag indicating top block availability

  381.  * @param c_avail flag indicating left block availability

  382.  * @param dc_val_ptr Pointer to DC predictor

  383.  * @param dir_ptr Prediction direction for use in AC prediction

  384.  */

  385. static inline int ff_vc1_pred_dc(MpegEncContext *s, int overlap, int pq, int n,

  386.                               int a_avail, int c_avail,

  387.                               int16_t **dc_val_ptr, int *dir_ptr)

  388. {

  389.     int a, b, c, wrap, pred;

  390.     int16_t *dc_val;

  391.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  392.     int q1, q2 = 0;

  393.     int dqscale_index;

  394. 

  395.     /* scale predictors if needed */

  396.     q1 = s->current_picture.qscale_table[mb_pos];

  397.     dqscale_index = s->y_dc_scale_table[q1] - 1;

  398.     if (dqscale_index < 0)

  399.         return 0;

  400. 

  401.     wrap = s->block_wrap[n];

  402.     dc_val = s->dc_val[0] + s->block_index[n];

  403. 

  404.     /* B A

  405.      * C X

  406.      */

  407.     c = dc_val[ - 1];

  408.     b = dc_val[ - 1 - wrap];

  409.     a = dc_val[ - wrap];

  410. 

  411.     if (c_avail && (n != 1 && n != 3)) {

  412.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  413.         if (q2 && q2 != q1)

  414.             c = (c * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  415.     }

  416.     if (a_avail && (n != 2 && n != 3)) {

  417.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  418.         if (q2 && q2 != q1)

  419.             a = (a * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  420.     }

  421.     if (a_avail && c_avail && (n != 3)) {

  422.         int off = mb_pos;

  423.         if (n != 1)

  424.             off--;

  425.         if (n != 2)

  426.             off -= s->mb_stride;

  427.         q2 = s->current_picture.qscale_table[off];

  428.         if (q2 && q2 != q1)

  429.             b = (b * s->y_dc_scale_table[q2] * ff_vc1_dqscale[dqscale_index] + 0x20000) >> 18;

  430.     }

  431. 

  432.     if (c_avail && (!a_avail || abs(a - b) <= abs(b - c))) {

  433.         pred     = c;

  434.         *dir_ptr = 1; // left

  435.     } else if (a_avail) {

  436.         pred     = a;

  437.         *dir_ptr = 0; // top

  438.     } else {

  439.         pred     = 0;

  440.         *dir_ptr = 1; // left

  441.     }

  442. 

  443.     /* update predictor */

  444.     *dc_val_ptr = &dc_val[0];

  445.     return pred;

  446. }

  447. 

  448. /** @} */ // Block group

  449. 

  450. /**

  451.  * @name VC1 Macroblock-level functions in Simple/Main Profiles

  452.  * @see 7.1.4, p91 and 8.1.1.7, p(1)04

  453.  * @{

  454.  */

  455. 

  456. static inline int vc1_coded_block_pred(MpegEncContext * s, int n,

  457.                                        uint8_t **coded_block_ptr)

  458. {

  459.     int xy, wrap, pred, a, b, c;

  460. 

  461.     xy   = s->block_index[n];

  462.     wrap = s->b8_stride;

  463. 

  464.     /* B C

  465.      * A X

  466.      */

  467.     a = s->coded_block[xy - 1       ];

  468.     b = s->coded_block[xy - 1 - wrap];

  469.     c = s->coded_block[xy     - wrap];

  470. 

  471.     if (b == c) {

  472.         pred = a;

  473.     } else {

  474.         pred = c;

  475.     }

  476. 

  477.     /* store value */

  478.     *coded_block_ptr = &s->coded_block[xy];

  479. 

  480.     return pred;

  481. }

  482. 

  483. /**

  484.  * Decode one AC coefficient

  485.  * @param v The VC1 context

  486.  * @param last Last coefficient

  487.  * @param skip How much zero coefficients to skip

  488.  * @param value Decoded AC coefficient value

  489.  * @param codingset set of VLC to decode data

  490.  * @see 8.1.3.4

  491.  */

  492. static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip,

  493.                                 int *value, int codingset)

  494. {

  495.     GetBitContext *gb = &v->s.gb;

  496.     int index, run, level, lst, sign;

  497. 

  498.     index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  499.     if (index != ff_vc1_ac_sizes[codingset] - 1) {

  500.         run   = vc1_index_decode_table[codingset][index][0];

  501.         level = vc1_index_decode_table[codingset][index][1];

  502.         lst   = index >= vc1_last_decode_table[codingset] || get_bits_left(gb) < 0;

  503.         sign  = get_bits1(gb);

  504.     } else {

  505.         int escape = decode210(gb);

  506.         if (escape != 2) {

  507.             index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3);

  508.             run   = vc1_index_decode_table[codingset][index][0];

  509.             level = vc1_index_decode_table[codingset][index][1];

  510.             lst   = index >= vc1_last_decode_table[codingset];

  511.             if (escape == 0) {

  512.                 if (lst)

  513.                     level += vc1_last_delta_level_table[codingset][run];

  514.                 else

  515.                     level += vc1_delta_level_table[codingset][run];

  516.             } else {

  517.                 if (lst)

  518.                     run += vc1_last_delta_run_table[codingset][level] + 1;

  519.                 else

  520.                     run += vc1_delta_run_table[codingset][level] + 1;

  521.             }

  522.             sign = get_bits1(gb);

  523.         } else {

  524.             lst = get_bits1(gb);

  525.             if (v->s.esc3_level_length == 0) {

  526.                 if (v->pq < 8 || v->dquantfrm) { // table 59

  527.                     v->s.esc3_level_length = get_bits(gb, 3);

  528.                     if (!v->s.esc3_level_length)

  529.                         v->s.esc3_level_length = get_bits(gb, 2) + 8;

  530.                 } else { // table 60

  531.                     v->s.esc3_level_length = get_unary(gb, 1, 6) + 2;

  532.                 }

  533.                 v->s.esc3_run_length = 3 + get_bits(gb, 2);

  534.             }

  535.             run   = get_bits(gb, v->s.esc3_run_length);

  536.             sign  = get_bits1(gb);

  537.             level = get_bits(gb, v->s.esc3_level_length);

  538.         }

  539.     }

  540. 

  541.     *last  = lst;

  542.     *skip  = run;

  543.     *value = (level ^ -sign) + sign;

  544. }

  545. 

  546. /** Decode intra block in intra frames - should be faster than decode_intra_block

  547.  * @param v VC1Context

  548.  * @param block block to decode

  549.  * @param[in] n subblock index

  550.  * @param coded are AC coeffs present or not

  551.  * @param codingset set of VLC to decode data

  552.  */

  553. static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,

  554.                               int coded, int codingset)

  555. {

  556.     GetBitContext *gb = &v->s.gb;

  557.     MpegEncContext *s = &v->s;

  558.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  559.     int i;

  560.     int16_t *dc_val;

  561.     int16_t *ac_val, *ac_val2;

  562.     int dcdiff, scale;

  563. 

  564.     /* Get DC differential */

  565.     if (n < 4) {

  566.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  567.     } else {

  568.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  569.     }

  570.     if (dcdiff < 0) {

  571.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  572.         return -1;

  573.     }

  574.     if (dcdiff) {

  575.         const int m = (v->pq == 1 || v->pq == 2) ? 3 - v->pq : 0;

  576.         if (dcdiff == 119 /* ESC index value */) {

  577.             dcdiff = get_bits(gb, 8 + m);

  578.         } else {

  579.             if (m)

  580.                 dcdiff = (dcdiff << m) + get_bits(gb, m) - ((1 << m) - 1);

  581.         }

  582.         if (get_bits1(gb))

  583.             dcdiff = -dcdiff;

  584.     }

  585. 

  586.     /* Prediction */

  587.     dcdiff += vc1_i_pred_dc(&v->s, v->overlap, v->pq, n, &dc_val, &dc_pred_dir);

  588.     *dc_val = dcdiff;

  589. 

  590.     /* Store the quantized DC coeff, used for prediction */

  591.     if (n < 4)

  592.         scale = s->y_dc_scale;

  593.     else

  594.         scale = s->c_dc_scale;

  595.     block[0] = dcdiff * scale;

  596. 

  597.     ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  598.     ac_val2 = ac_val;

  599.     if (dc_pred_dir) // left

  600.         ac_val -= 16;

  601.     else // top

  602.         ac_val -= 16 * s->block_wrap[n];

  603. 

  604.     scale = v->pq * 2 + v->halfpq;

  605. 

  606.     //AC Decoding

  607.     i = !!coded;

  608. 

  609.     if (coded) {

  610.         int last = 0, skip, value;

  611.         const uint8_t *zz_table;

  612.         int k;

  613. 

  614.         if (v->s.ac_pred) {

  615.             if (!dc_pred_dir)

  616.                 zz_table = v->zz_8x8[2];

  617.             else

  618.                 zz_table = v->zz_8x8[3];

  619.         } else

  620.             zz_table = v->zz_8x8[1];

  621. 

  622.         while (!last) {

  623.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  624.             i += skip;

  625.             if (i > 63)

  626.                 break;

  627.             block[zz_table[i++]] = value;

  628.         }

  629. 

  630.         /* apply AC prediction if needed */

  631.         if (s->ac_pred) {

  632.             int sh;

  633.             if (dc_pred_dir) { // left

  634.                 sh = v->left_blk_sh;

  635.             } else { // top

  636.                 sh = v->top_blk_sh;

  637.                 ac_val += 8;

  638.             }

  639.             for (k = 1; k < 8; k++)

  640.                 block[k << sh] += ac_val[k];

  641.         }

  642.         /* save AC coeffs for further prediction */

  643.         for (k = 1; k < 8; k++) {

  644.             ac_val2[k]     = block[k << v->left_blk_sh];

  645.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  646.         }

  647. 

  648.         /* scale AC coeffs */

  649.         for (k = 1; k < 64; k++)

  650.             if (block[k]) {

  651.                 block[k] *= scale;

  652.                 if (!v->pquantizer)

  653.                     block[k] += (block[k] < 0) ? -v->pq : v->pq;

  654.             }

  655. 

  656.     } else {

  657.         int k;

  658. 

  659.         memset(ac_val2, 0, 16 * 2);

  660. 

  661.         /* apply AC prediction if needed */

  662.         if (s->ac_pred) {

  663.             int sh;

  664.             if (dc_pred_dir) { //left

  665.                 sh = v->left_blk_sh;

  666.             } else { // top

  667.                 sh = v->top_blk_sh;

  668.                 ac_val  += 8;

  669.                 ac_val2 += 8;

  670.             }

  671.             memcpy(ac_val2, ac_val, 8 * 2);

  672.             for (k = 1; k < 8; k++) {

  673.                 block[k << sh] = ac_val[k] * scale;

  674.                 if (!v->pquantizer && block[k << sh])

  675.                     block[k << sh] += (block[k << sh] < 0) ? -v->pq : v->pq;

  676.             }

  677.         }

  678.     }

  679.     if (s->ac_pred) i = 63;

  680.     s->block_last_index[n] = i;

  681. 

  682.     return 0;

  683. }

  684. 

  685. /** Decode intra block in intra frames - should be faster than decode_intra_block

  686.  * @param v VC1Context

  687.  * @param block block to decode

  688.  * @param[in] n subblock number

  689.  * @param coded are AC coeffs present or not

  690.  * @param codingset set of VLC to decode data

  691.  * @param mquant quantizer value for this macroblock

  692.  */

  693. static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,

  694.                                   int coded, int codingset, int mquant)

  695. {

  696.     GetBitContext *gb = &v->s.gb;

  697.     MpegEncContext *s = &v->s;

  698.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  699.     int i;

  700.     int16_t *dc_val = NULL;

  701.     int16_t *ac_val, *ac_val2;

  702.     int dcdiff;

  703.     int a_avail = v->a_avail, c_avail = v->c_avail;

  704.     int use_pred = s->ac_pred;

  705.     int scale;

  706.     int q1, q2 = 0;

  707.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  708. 

  709.     /* Get DC differential */

  710.     if (n < 4) {

  711.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  712.     } else {

  713.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  714.     }

  715.     if (dcdiff < 0) {

  716.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  717.         return -1;

  718.     }

  719.     if (dcdiff) {

  720.         const int m = (mquant == 1 || mquant == 2) ? 3 - mquant : 0;

  721.         if (dcdiff == 119 /* ESC index value */) {

  722.             dcdiff = get_bits(gb, 8 + m);

  723.         } else {

  724.             if (m)

  725.                 dcdiff = (dcdiff << m) + get_bits(gb, m) - ((1 << m) - 1);

  726.         }

  727.         if (get_bits1(gb))

  728.             dcdiff = -dcdiff;

  729.     }

  730. 

  731.     /* Prediction */

  732.     dcdiff += ff_vc1_pred_dc(&v->s, v->overlap, mquant, n, v->a_avail, v->c_avail, &dc_val, &dc_pred_dir);

  733.     *dc_val = dcdiff;

  734. 

  735.     /* Store the quantized DC coeff, used for prediction */

  736.     if (n < 4)

  737.         scale = s->y_dc_scale;

  738.     else

  739.         scale = s->c_dc_scale;

  740.     block[0] = dcdiff * scale;

  741. 

  742.     /* check if AC is needed at all */

  743.     if (!a_avail && !c_avail)

  744.         use_pred = 0;

  745. 

  746.     scale = mquant * 2 + ((mquant == v->pq) ? v->halfpq : 0);

  747. 

  748.     ac_val  = s->ac_val[0][0] + s->block_index[n] * 16;

  749.     ac_val2 = ac_val;

  750.     if (dc_pred_dir) // left

  751.         ac_val -= 16;

  752.     else // top

  753.         ac_val -= 16 * s->block_wrap[n];

  754. 

  755.     q1 = s->current_picture.qscale_table[mb_pos];

  756.     if (n == 3)

  757.         q2 = q1;

  758.     else if (dc_pred_dir) {

  759.         if (n == 1)

  760.             q2 = q1;

  761.         else if (c_avail && mb_pos)

  762.             q2 = s->current_picture.qscale_table[mb_pos - 1];

  763.     } else {

  764.         if (n == 2)

  765.             q2 = q1;

  766.         else if (a_avail && mb_pos >= s->mb_stride)

  767.             q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  768.     }

  769. 

  770.     //AC Decoding

  771.     i = 1;

  772. 

  773.     if (coded) {

  774.         int last = 0, skip, value;

  775.         const uint8_t *zz_table;

  776.         int k;

  777. 

  778.         if (v->s.ac_pred) {

  779.             if (!use_pred && v->fcm == ILACE_FRAME) {

  780.                 zz_table = v->zzi_8x8;

  781.             } else {

  782.                 if (!dc_pred_dir) // top

  783.                     zz_table = v->zz_8x8[2];

  784.                 else // left

  785.                     zz_table = v->zz_8x8[3];

  786.             }

  787.         } else {

  788.             if (v->fcm != ILACE_FRAME)

  789.                 zz_table = v->zz_8x8[1];

  790.             else

  791.                 zz_table = v->zzi_8x8;

  792.         }

  793. 

  794.         while (!last) {

  795.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  796.             i += skip;

  797.             if (i > 63)

  798.                 break;

  799.             block[zz_table[i++]] = value;

  800.         }

  801. 

  802.         /* apply AC prediction if needed */

  803.         if (use_pred) {

  804.             int sh;

  805.             if (dc_pred_dir) { // left

  806.                 sh = v->left_blk_sh;

  807.             } else { // top

  808.                 sh = v->top_blk_sh;

  809.                 ac_val += 8;

  810.             }

  811.             /* scale predictors if needed*/

  812.             if (q2 && q1 != q2) {

  813.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  814.                 if (q1 < 1)

  815.                     return AVERROR_INVALIDDATA;

  816.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  817.                 for (k = 1; k < 8; k++)

  818.                     block[k << sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  819.             } else {

  820.                 for (k = 1; k < 8; k++)

  821.                     block[k << sh] += ac_val[k];

  822.             }

  823.         }

  824.         /* save AC coeffs for further prediction */

  825.         for (k = 1; k < 8; k++) {

  826.             ac_val2[k    ] = block[k << v->left_blk_sh];

  827.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  828.         }

  829. 

  830.         /* scale AC coeffs */

  831.         for (k = 1; k < 64; k++)

  832.             if (block[k]) {

  833.                 block[k] *= scale;

  834.                 if (!v->pquantizer)

  835.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  836.             }

  837. 

  838.     } else { // no AC coeffs

  839.         int k;

  840. 

  841.         memset(ac_val2, 0, 16 * 2);

  842. 

  843.         /* apply AC prediction if needed */

  844.         if (use_pred) {

  845.             int sh;

  846.             if (dc_pred_dir) { // left

  847.                 sh = v->left_blk_sh;

  848.             } else { // top

  849.                 sh = v->top_blk_sh;

  850.                 ac_val  += 8;

  851.                 ac_val2 += 8;

  852.             }

  853.             memcpy(ac_val2, ac_val, 8 * 2);

  854.             if (q2 && q1 != q2) {

  855.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  856.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  857.                 if (q1 < 1)

  858.                     return AVERROR_INVALIDDATA;

  859.                 for (k = 1; k < 8; k++)

  860.                     ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  861.             }

  862.             for (k = 1; k < 8; k++) {

  863.                 block[k << sh] = ac_val2[k] * scale;

  864.                 if (!v->pquantizer && block[k << sh])

  865.                     block[k << sh] += (block[k << sh] < 0) ? -mquant : mquant;

  866.             }

  867.         }

  868.     }

  869.     if (use_pred) i = 63;

  870.     s->block_last_index[n] = i;

  871. 

  872.     return 0;

  873. }

  874. 

  875. /** Decode intra block in inter frames - more generic version than vc1_decode_i_block

  876.  * @param v VC1Context

  877.  * @param block block to decode

  878.  * @param[in] n subblock index

  879.  * @param coded are AC coeffs present or not

  880.  * @param mquant block quantizer

  881.  * @param codingset set of VLC to decode data

  882.  */

  883. static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,

  884.                                   int coded, int mquant, int codingset)

  885. {

  886.     GetBitContext *gb = &v->s.gb;

  887.     MpegEncContext *s = &v->s;

  888.     int dc_pred_dir = 0; /* Direction of the DC prediction used */

  889.     int i;

  890.     int16_t *dc_val = NULL;

  891.     int16_t *ac_val, *ac_val2;

  892.     int dcdiff;

  893.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  894.     int a_avail = v->a_avail, c_avail = v->c_avail;

  895.     int use_pred = s->ac_pred;

  896.     int scale;

  897.     int q1, q2 = 0;

  898. 

  899.     s->bdsp.clear_block(block);

  900. 

  901.     /* XXX: Guard against dumb values of mquant */

  902.     mquant = av_clip_uintp2(mquant, 5);

  903. 

  904.     /* Set DC scale - y and c use the same */

  905.     s->y_dc_scale = s->y_dc_scale_table[mquant];

  906.     s->c_dc_scale = s->c_dc_scale_table[mquant];

  907. 

  908.     /* Get DC differential */

  909.     if (n < 4) {

  910.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_luma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  911.     } else {

  912.         dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);

  913.     }

  914.     if (dcdiff < 0) {

  915.         av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");

  916.         return -1;

  917.     }

  918.     if (dcdiff) {

  919.         const int m = (mquant == 1 || mquant == 2) ? 3 - mquant : 0;

  920.         if (dcdiff == 119 /* ESC index value */) {

  921.             dcdiff = get_bits(gb, 8 + m);

  922.         } else {

  923.             if (m)

  924.                 dcdiff = (dcdiff << m) + get_bits(gb, m) - ((1 << m) - 1);

  925.         }

  926.         if (get_bits1(gb))

  927.             dcdiff = -dcdiff;

  928.     }

  929. 

  930.     /* Prediction */

  931.     dcdiff += ff_vc1_pred_dc(&v->s, v->overlap, mquant, n, a_avail, c_avail, &dc_val, &dc_pred_dir);

  932.     *dc_val = dcdiff;

  933. 

  934.     /* Store the quantized DC coeff, used for prediction */

  935. 

  936.     if (n < 4) {

  937.         block[0] = dcdiff * s->y_dc_scale;

  938.     } else {

  939.         block[0] = dcdiff * s->c_dc_scale;

  940.     }

  941. 

  942.     //AC Decoding

  943.     i = 1;

  944. 

  945.     /* check if AC is needed at all and adjust direction if needed */

  946.     if (!a_avail) dc_pred_dir = 1;

  947.     if (!c_avail) dc_pred_dir = 0;

  948.     if (!a_avail && !c_avail) use_pred = 0;

  949.     ac_val = s->ac_val[0][0] + s->block_index[n] * 16;

  950.     ac_val2 = ac_val;

  951. 

  952.     scale = mquant * 2 + v->halfpq;

  953. 

  954.     if (dc_pred_dir) //left

  955.         ac_val -= 16;

  956.     else //top

  957.         ac_val -= 16 * s->block_wrap[n];

  958. 

  959.     q1 = s->current_picture.qscale_table[mb_pos];

  960.     if (dc_pred_dir && c_avail && mb_pos)

  961.         q2 = s->current_picture.qscale_table[mb_pos - 1];

  962.     if (!dc_pred_dir && a_avail && mb_pos >= s->mb_stride)

  963.         q2 = s->current_picture.qscale_table[mb_pos - s->mb_stride];

  964.     if ( dc_pred_dir && n == 1)

  965.         q2 = q1;

  966.     if (!dc_pred_dir && n == 2)

  967.         q2 = q1;

  968.     if (n == 3) q2 = q1;

  969. 

  970.     if (coded) {

  971.         int last = 0, skip, value;

  972.         int k;

  973. 

  974.         while (!last) {

  975.             vc1_decode_ac_coeff(v, &last, &skip, &value, codingset);

  976.             i += skip;

  977.             if (i > 63)

  978.                 break;

  979.             if (v->fcm == PROGRESSIVE)

  980.                 block[v->zz_8x8[0][i++]] = value;

  981.             else {

  982.                 if (use_pred && (v->fcm == ILACE_FRAME)) {

  983.                     if (!dc_pred_dir) // top

  984.                         block[v->zz_8x8[2][i++]] = value;

  985.                     else // left

  986.                         block[v->zz_8x8[3][i++]] = value;

  987.                 } else {

  988.                     block[v->zzi_8x8[i++]] = value;

  989.                 }

  990.             }

  991.         }

  992. 

  993.         /* apply AC prediction if needed */

  994.         if (use_pred) {

  995.             /* scale predictors if needed*/

  996.             if (q2 && q1 != q2) {

  997.                 q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  998.                 q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  999. 

  1000.                 if (q1 < 1)

  1001.                     return AVERROR_INVALIDDATA;

  1002.                 if (dc_pred_dir) { // left

  1003.                     for (k = 1; k < 8; k++)

  1004.                         block[k << v->left_blk_sh] += (ac_val[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1005.                 } else { //top

  1006.                     for (k = 1; k < 8; k++)

  1007.                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1008.                 }

  1009.             } else {

  1010.                 if (dc_pred_dir) { // left

  1011.                     for (k = 1; k < 8; k++)

  1012.                         block[k << v->left_blk_sh] += ac_val[k];

  1013.                 } else { // top

  1014.                     for (k = 1; k < 8; k++)

  1015.                         block[k << v->top_blk_sh] += ac_val[k + 8];

  1016.                 }

  1017.             }

  1018.         }

  1019.         /* save AC coeffs for further prediction */

  1020.         for (k = 1; k < 8; k++) {

  1021.             ac_val2[k    ] = block[k << v->left_blk_sh];

  1022.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  1023.         }

  1024. 

  1025.         /* scale AC coeffs */

  1026.         for (k = 1; k < 64; k++)

  1027.             if (block[k]) {

  1028.                 block[k] *= scale;

  1029.                 if (!v->pquantizer)

  1030.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  1031.             }

  1032. 

  1033.         if (use_pred) i = 63;

  1034.     } else { // no AC coeffs

  1035.         int k;

  1036. 

  1037.         memset(ac_val2, 0, 16 * 2);

  1038.         if (dc_pred_dir) { // left

  1039.             if (use_pred) {

  1040.                 memcpy(ac_val2, ac_val, 8 * 2);

  1041.                 if (q2 && q1 != q2) {

  1042.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  1043.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  1044.                     if (q1 < 1)

  1045.                         return AVERROR_INVALIDDATA;

  1046.                     for (k = 1; k < 8; k++)

  1047.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1048.                 }

  1049.             }

  1050.         } else { // top

  1051.             if (use_pred) {

  1052.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  1053.                 if (q2 && q1 != q2) {

  1054.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  1055.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  1056.                     if (q1 < 1)

  1057.                         return AVERROR_INVALIDDATA;

  1058.                     for (k = 1; k < 8; k++)

  1059.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1060.                 }

  1061.             }

  1062.         }

  1063. 

  1064.         /* apply AC prediction if needed */

  1065.         if (use_pred) {

  1066.             if (dc_pred_dir) { // left

  1067.                 for (k = 1; k < 8; k++) {

  1068.                     block[k << v->left_blk_sh] = ac_val2[k] * scale;

  1069.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  1070.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;

  1071.                 }

  1072.             } else { // top

  1073.                 for (k = 1; k < 8; k++) {

  1074.                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;

  1075.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  1076.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;

  1077.                 }

  1078.             }

  1079.             i = 63;

  1080.         }

  1081.     }

  1082.     s->block_last_index[n] = i;

  1083. 

  1084.     return 0;

  1085. }

  1086. 

  1087. /** Decode P block

  1088.  */

  1089. static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,

  1090.                               int mquant, int ttmb, int first_block,

  1091.                               uint8_t *dst, int linesize, int skip_block,

  1092.                               int *ttmb_out)

  1093. {

  1094.     MpegEncContext *s = &v->s;

  1095.     GetBitContext *gb = &s->gb;

  1096.     int i, j;

  1097.     int subblkpat = 0;

  1098.     int scale, off, idx, last, skip, value;

  1099.     int ttblk = ttmb & 7;

  1100.     int pat = 0;

  1101. 

  1102.     s->bdsp.clear_block(block);

  1103. 

  1104.     if (ttmb == -1) {

  1105.         ttblk = ff_vc1_ttblk_to_tt[v->tt_index][get_vlc2(gb, ff_vc1_ttblk_vlc[v->tt_index].table, VC1_TTBLK_VLC_BITS, 1)];

  1106.     }

  1107.     if (ttblk == TT_4X4) {

  1108.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  1109.     }

  1110.     if ((ttblk != TT_8X8 && ttblk != TT_4X4)

  1111.         && ((v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))

  1112.             || (!v->res_rtm_flag && !first_block))) {

  1113.         subblkpat = decode012(gb);

  1114.         if (subblkpat)

  1115.             subblkpat ^= 3; // swap decoded pattern bits

  1116.         if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM)

  1117.             ttblk = TT_8X4;

  1118.         if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT)

  1119.             ttblk = TT_4X8;

  1120.     }

  1121.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  1122. 

  1123.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  1124.     if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  1125.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  1126.         ttblk     = TT_8X4;

  1127.     }

  1128.     if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  1129.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  1130.         ttblk     = TT_4X8;

  1131.     }

  1132.     switch (ttblk) {

  1133.     case TT_8X8:

  1134.         pat  = 0xF;

  1135.         i    = 0;

  1136.         last = 0;

  1137.         while (!last) {

  1138.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  1139.             i += skip;

  1140.             if (i > 63)

  1141.                 break;

  1142.             if (!v->fcm)

  1143.                 idx = v->zz_8x8[0][i++];

  1144.             else

  1145.                 idx = v->zzi_8x8[i++];

  1146.             block[idx] = value * scale;

  1147.             if (!v->pquantizer)

  1148.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  1149.         }

  1150.         if (!skip_block) {

  1151.             if (i == 1)

  1152.                 v->vc1dsp.vc1_inv_trans_8x8_dc(dst, linesize, block);

  1153.             else {

  1154.                 v->vc1dsp.vc1_inv_trans_8x8(block);

  1155.                 s->idsp.add_pixels_clamped(block, dst, linesize);

  1156.             }

  1157.         }

  1158.         break;

  1159.     case TT_4X4:

  1160.         pat = ~subblkpat & 0xF;

  1161.         for (j = 0; j < 4; j++) {

  1162.             last = subblkpat & (1 << (3 - j));

  1163.             i    = 0;

  1164.             off  = (j & 1) * 4 + (j & 2) * 16;

  1165.             while (!last) {

  1166.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  1167.                 i += skip;

  1168.                 if (i > 15)

  1169.                     break;

  1170.                 if (!v->fcm)

  1171.                     idx = ff_vc1_simple_progressive_4x4_zz[i++];

  1172.                 else

  1173.                     idx = ff_vc1_adv_interlaced_4x4_zz[i++];

  1174.                 block[idx + off] = value * scale;

  1175.                 if (!v->pquantizer)

  1176.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  1177.             }

  1178.             if (!(subblkpat & (1 << (3 - j))) && !skip_block) {

  1179.                 if (i == 1)

  1180.                     v->vc1dsp.vc1_inv_trans_4x4_dc(dst + (j & 1) * 4 + (j & 2) * 2 * linesize, linesize, block + off);

  1181.                 else

  1182.                     v->vc1dsp.vc1_inv_trans_4x4(dst + (j & 1) * 4 + (j & 2) *  2 * linesize, linesize, block + off);

  1183.             }

  1184.         }

  1185.         break;

  1186.     case TT_8X4:

  1187.         pat = ~((subblkpat & 2) * 6 + (subblkpat & 1) * 3) & 0xF;

  1188.         for (j = 0; j < 2; j++) {

  1189.             last = subblkpat & (1 << (1 - j));

  1190.             i    = 0;

  1191.             off  = j * 32;

  1192.             while (!last) {

  1193.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  1194.                 i += skip;

  1195.                 if (i > 31)

  1196.                     break;

  1197.                 if (!v->fcm)

  1198.                     idx = v->zz_8x4[i++] + off;

  1199.                 else

  1200.                     idx = ff_vc1_adv_interlaced_8x4_zz[i++] + off;

  1201.                 block[idx] = value * scale;

  1202.                 if (!v->pquantizer)

  1203.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  1204.             }

  1205.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  1206.                 if (i == 1)

  1207.                     v->vc1dsp.vc1_inv_trans_8x4_dc(dst + j * 4 * linesize, linesize, block + off);

  1208.                 else

  1209.                     v->vc1dsp.vc1_inv_trans_8x4(dst + j * 4 * linesize, linesize, block + off);

  1210.             }

  1211.         }

  1212.         break;

  1213.     case TT_4X8:

  1214.         pat = ~(subblkpat * 5) & 0xF;

  1215.         for (j = 0; j < 2; j++) {

  1216.             last = subblkpat & (1 << (1 - j));

  1217.             i    = 0;

  1218.             off  = j * 4;

  1219.             while (!last) {

  1220.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  1221.                 i += skip;

  1222.                 if (i > 31)

  1223.                     break;

  1224.                 if (!v->fcm)

  1225.                     idx = v->zz_4x8[i++] + off;

  1226.                 else

  1227.                     idx = ff_vc1_adv_interlaced_4x8_zz[i++] + off;

  1228.                 block[idx] = value * scale;

  1229.                 if (!v->pquantizer)

  1230.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  1231.             }

  1232.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  1233.                 if (i == 1)

  1234.                     v->vc1dsp.vc1_inv_trans_4x8_dc(dst + j * 4, linesize, block + off);

  1235.                 else

  1236.                     v->vc1dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);

  1237.             }

  1238.         }

  1239.         break;

  1240.     }

  1241.     if (ttmb_out)

  1242.         *ttmb_out |= ttblk << (n * 4);

  1243.     return pat;

  1244. }

  1245. 

  1246. /** @} */ // Macroblock group

  1247. 

  1248. static const uint8_t size_table[6] = { 0, 2, 3, 4,  5,  8 };

  1249. 

  1250. /** Decode one P-frame MB

  1251.  */

  1252. static int vc1_decode_p_mb(VC1Context *v)

  1253. {

  1254.     MpegEncContext *s = &v->s;

  1255.     GetBitContext *gb = &s->gb;

  1256.     int i, j;

  1257.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1258.     int cbp; /* cbp decoding stuff */

  1259.     int mqdiff, mquant; /* MB quantization */

  1260.     int ttmb = v->ttfrm; /* MB Transform type */

  1261. 

  1262.     int mb_has_coeffs = 1; /* last_flag */

  1263.     int dmv_x, dmv_y; /* Differential MV components */

  1264.     int index, index1; /* LUT indexes */

  1265.     int val, sign; /* temp values */

  1266.     int first_block = 1;

  1267.     int dst_idx, off;

  1268.     int skipped, fourmv;

  1269.     int block_cbp = 0, pat, block_tt = 0, block_intra = 0;

  1270. 

  1271.     mquant = v->pq; /* lossy initialization */

  1272. 

  1273.     if (v->mv_type_is_raw)

  1274.         fourmv = get_bits1(gb);

  1275.     else

  1276.         fourmv = v->mv_type_mb_plane[mb_pos];

  1277.     if (v->skip_is_raw)

  1278.         skipped = get_bits1(gb);

  1279.     else

  1280.         skipped = v->s.mbskip_table[mb_pos];

  1281. 

  1282.     if (!fourmv) { /* 1MV mode */

  1283.         if (!skipped) {

  1284.             GET_MVDATA(dmv_x, dmv_y);

  1285. 

  1286.             if (s->mb_intra) {

  1287.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  1288.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  1289.             }

  1290.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  1291.             ff_vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  1292. 

  1293.             /* FIXME Set DC val for inter block ? */

  1294.             if (s->mb_intra && !mb_has_coeffs) {

  1295.                 GET_MQUANT();

  1296.                 s->ac_pred = get_bits1(gb);

  1297.                 cbp        = 0;

  1298.             } else if (mb_has_coeffs) {

  1299.                 if (s->mb_intra)

  1300.                     s->ac_pred = get_bits1(gb);

  1301.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1302.                 GET_MQUANT();

  1303.             } else {

  1304.                 mquant = v->pq;

  1305.                 cbp    = 0;

  1306.             }

  1307.             s->current_picture.qscale_table[mb_pos] = mquant;

  1308. 

  1309.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  1310.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  1311.                                 VC1_TTMB_VLC_BITS, 2);

  1312.             if (!s->mb_intra) ff_vc1_mc_1mv(v, 0);

  1313.             dst_idx = 0;

  1314.             for (i = 0; i < 6; i++) {

  1315.                 s->dc_val[0][s->block_index[i]] = 0;

  1316.                 dst_idx += i >> 2;

  1317.                 val = ((cbp >> (5 - i)) & 1);

  1318.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1319.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  1320.                 if (s->mb_intra) {

  1321.                     /* check if prediction blocks A and C are available */

  1322.                     v->a_avail = v->c_avail = 0;

  1323.                     if (i == 2 || i == 3 || !s->first_slice_line)

  1324.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1325.                     if (i == 1 || i == 3 || s->mb_x)

  1326.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1327. 

  1328.                     vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  1329.                                            (i & 4) ? v->codingset2 : v->codingset);

  1330.                     if (CONFIG_GRAY && (i>3) && (s->flags & CODEC_FLAG_GRAY))

  1331.                         continue;

  1332.                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  1333.                     if (v->rangeredfrm)

  1334.                         for (j = 0; j < 64; j++)

  1335.                             s->block[i][j] <<= 1;

  1336.                     s->idsp.put_signed_pixels_clamped(s->block[i],

  1337.                                                       s->dest[dst_idx] + off,

  1338.                                                       i & 4 ? s->uvlinesize

  1339.                                                             : s->linesize);

  1340.                     if (v->pq >= 9 && v->overlap) {

  1341.                         if (v->c_avail)

  1342.                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  1343.                         if (v->a_avail)

  1344.                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  1345.                     }

  1346.                     block_cbp   |= 0xF << (i << 2);

  1347.                     block_intra |= 1 << i;

  1348.                 } else if (val) {

  1349.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb, first_block,

  1350.                                              s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize,

  1351.                                              CONFIG_GRAY && (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  1352.                     block_cbp |= pat << (i << 2);

  1353.                     if (!v->ttmbf && ttmb < 8)

  1354.                         ttmb = -1;

  1355.                     first_block = 0;

  1356.                 }

  1357.             }

  1358.         } else { // skipped

  1359.             s->mb_intra = 0;

  1360.             for (i = 0; i < 6; i++) {

  1361.                 v->mb_type[0][s->block_index[i]] = 0;

  1362.                 s->dc_val[0][s->block_index[i]]  = 0;

  1363.             }

  1364.             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  1365.             s->current_picture.qscale_table[mb_pos] = 0;

  1366.             ff_vc1_pred_mv(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  1367.             ff_vc1_mc_1mv(v, 0);

  1368.         }

  1369.     } else { // 4MV mode

  1370.         if (!skipped /* unskipped MB */) {

  1371.             int intra_count = 0, coded_inter = 0;

  1372.             int is_intra[6], is_coded[6];

  1373.             /* Get CBPCY */

  1374.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1375.             for (i = 0; i < 6; i++) {

  1376.                 val = ((cbp >> (5 - i)) & 1);

  1377.                 s->dc_val[0][s->block_index[i]] = 0;

  1378.                 s->mb_intra                     = 0;

  1379.                 if (i < 4) {

  1380.                     dmv_x = dmv_y = 0;

  1381.                     s->mb_intra   = 0;

  1382.                     mb_has_coeffs = 0;

  1383.                     if (val) {

  1384.                         GET_MVDATA(dmv_x, dmv_y);

  1385.                     }

  1386.                     ff_vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  1387.                     if (!s->mb_intra)

  1388.                         ff_vc1_mc_4mv_luma(v, i, 0, 0);

  1389.                     intra_count += s->mb_intra;

  1390.                     is_intra[i]  = s->mb_intra;

  1391.                     is_coded[i]  = mb_has_coeffs;

  1392.                 }

  1393.                 if (i & 4) {

  1394.                     is_intra[i] = (intra_count >= 3);

  1395.                     is_coded[i] = val;

  1396.                 }

  1397.                 if (i == 4)

  1398.                     ff_vc1_mc_4mv_chroma(v, 0);

  1399.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  1400.                 if (!coded_inter)

  1401.                     coded_inter = !is_intra[i] & is_coded[i];

  1402.             }

  1403.             // if there are no coded blocks then don't do anything more

  1404.             dst_idx = 0;

  1405.             if (!intra_count && !coded_inter)

  1406.                 goto end;

  1407.             GET_MQUANT();

  1408.             s->current_picture.qscale_table[mb_pos] = mquant;

  1409.             /* test if block is intra and has pred */

  1410.             {

  1411.                 int intrapred = 0;

  1412.                 for (i = 0; i < 6; i++)

  1413.                     if (is_intra[i]) {

  1414.                         if (((!s->first_slice_line || (i == 2 || i == 3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  1415.                             || ((s->mb_x || (i == 1 || i == 3)) && v->mb_type[0][s->block_index[i] - 1])) {

  1416.                             intrapred = 1;

  1417.                             break;

  1418.                         }

  1419.                     }

  1420.                 if (intrapred)

  1421.                     s->ac_pred = get_bits1(gb);

  1422.                 else

  1423.                     s->ac_pred = 0;

  1424.             }

  1425.             if (!v->ttmbf && coded_inter)

  1426.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1427.             for (i = 0; i < 6; i++) {

  1428.                 dst_idx    += i >> 2;

  1429.                 off         = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1430.                 s->mb_intra = is_intra[i];

  1431.                 if (is_intra[i]) {

  1432.                     /* check if prediction blocks A and C are available */

  1433.                     v->a_avail = v->c_avail = 0;

  1434.                     if (i == 2 || i == 3 || !s->first_slice_line)

  1435.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1436.                     if (i == 1 || i == 3 || s->mb_x)

  1437.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1438. 

  1439.                     vc1_decode_intra_block(v, s->block[i], i, is_coded[i], mquant,

  1440.                                            (i & 4) ? v->codingset2 : v->codingset);

  1441.                     if (CONFIG_GRAY && (i>3) && (s->flags & CODEC_FLAG_GRAY))

  1442.                         continue;

  1443.                     v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  1444.                     if (v->rangeredfrm)

  1445.                         for (j = 0; j < 64; j++)

  1446.                             s->block[i][j] <<= 1;

  1447.                     s->idsp.put_signed_pixels_clamped(s->block[i],

  1448.                                                       s->dest[dst_idx] + off,

  1449.                                                       (i & 4) ? s->uvlinesize

  1450.                                                               : s->linesize);

  1451.                     if (v->pq >= 9 && v->overlap) {

  1452.                         if (v->c_avail)

  1453.                             v->vc1dsp.vc1_h_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  1454.                         if (v->a_avail)

  1455.                             v->vc1dsp.vc1_v_overlap(s->dest[dst_idx] + off, i & 4 ? s->uvlinesize : s->linesize);

  1456.                     }

  1457.                     block_cbp   |= 0xF << (i << 2);

  1458.                     block_intra |= 1 << i;

  1459.                 } else if (is_coded[i]) {

  1460.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  1461.                                              first_block, s->dest[dst_idx] + off,

  1462.                                              (i & 4) ? s->uvlinesize : s->linesize,

  1463.                                              CONFIG_GRAY && (i & 4) && (s->flags & CODEC_FLAG_GRAY),

  1464.                                              &block_tt);

  1465.                     block_cbp |= pat << (i << 2);

  1466.                     if (!v->ttmbf && ttmb < 8)

  1467.                         ttmb = -1;

  1468.                     first_block = 0;

  1469.                 }

  1470.             }

  1471.         } else { // skipped MB

  1472.             s->mb_intra                               = 0;

  1473.             s->current_picture.qscale_table[mb_pos] = 0;

  1474.             for (i = 0; i < 6; i++) {

  1475.                 v->mb_type[0][s->block_index[i]] = 0;

  1476.                 s->dc_val[0][s->block_index[i]]  = 0;

  1477.             }

  1478.             for (i = 0; i < 4; i++) {

  1479.                 ff_vc1_pred_mv(v, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  1480.                 ff_vc1_mc_4mv_luma(v, i, 0, 0);

  1481.             }

  1482.             ff_vc1_mc_4mv_chroma(v, 0);

  1483.             s->current_picture.qscale_table[mb_pos] = 0;

  1484.         }

  1485.     }

  1486. end:

  1487.     v->cbp[s->mb_x]      = block_cbp;

  1488.     v->ttblk[s->mb_x]    = block_tt;

  1489.     v->is_intra[s->mb_x] = block_intra;

  1490. 

  1491.     return 0;

  1492. }

  1493. 

  1494. /* Decode one macroblock in an interlaced frame p picture */

  1495. 

  1496. static int vc1_decode_p_mb_intfr(VC1Context *v)

  1497. {

  1498.     MpegEncContext *s = &v->s;

  1499.     GetBitContext *gb = &s->gb;

  1500.     int i;

  1501.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1502.     int cbp = 0; /* cbp decoding stuff */

  1503.     int mqdiff, mquant; /* MB quantization */

  1504.     int ttmb = v->ttfrm; /* MB Transform type */

  1505. 

  1506.     int mb_has_coeffs = 1; /* last_flag */

  1507.     int dmv_x, dmv_y; /* Differential MV components */

  1508.     int val; /* temp value */

  1509.     int first_block = 1;

  1510.     int dst_idx, off;

  1511.     int skipped, fourmv = 0, twomv = 0;

  1512.     int block_cbp = 0, pat, block_tt = 0;

  1513.     int idx_mbmode = 0, mvbp;

  1514.     int stride_y, fieldtx;

  1515. 

  1516.     mquant = v->pq; /* Lossy initialization */

  1517. 

  1518.     if (v->skip_is_raw)

  1519.         skipped = get_bits1(gb);

  1520.     else

  1521.         skipped = v->s.mbskip_table[mb_pos];

  1522.     if (!skipped) {

  1523.         if (v->fourmvswitch)

  1524.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_4MV_MBMODE_VLC_BITS, 2); // try getting this done

  1525.         else

  1526.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2); // in a single line

  1527.         switch (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0]) {

  1528.         /* store the motion vector type in a flag (useful later) */

  1529.         case MV_PMODE_INTFR_4MV:

  1530.             fourmv = 1;

  1531.             v->blk_mv_type[s->block_index[0]] = 0;

  1532.             v->blk_mv_type[s->block_index[1]] = 0;

  1533.             v->blk_mv_type[s->block_index[2]] = 0;

  1534.             v->blk_mv_type[s->block_index[3]] = 0;

  1535.             break;

  1536.         case MV_PMODE_INTFR_4MV_FIELD:

  1537.             fourmv = 1;

  1538.             v->blk_mv_type[s->block_index[0]] = 1;

  1539.             v->blk_mv_type[s->block_index[1]] = 1;

  1540.             v->blk_mv_type[s->block_index[2]] = 1;

  1541.             v->blk_mv_type[s->block_index[3]] = 1;

  1542.             break;

  1543.         case MV_PMODE_INTFR_2MV_FIELD:

  1544.             twomv = 1;

  1545.             v->blk_mv_type[s->block_index[0]] = 1;

  1546.             v->blk_mv_type[s->block_index[1]] = 1;

  1547.             v->blk_mv_type[s->block_index[2]] = 1;

  1548.             v->blk_mv_type[s->block_index[3]] = 1;

  1549.             break;

  1550.         case MV_PMODE_INTFR_1MV:

  1551.             v->blk_mv_type[s->block_index[0]] = 0;

  1552.             v->blk_mv_type[s->block_index[1]] = 0;

  1553.             v->blk_mv_type[s->block_index[2]] = 0;

  1554.             v->blk_mv_type[s->block_index[3]] = 0;

  1555.             break;

  1556.         }

  1557.         if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB

  1558.             for (i = 0; i < 4; i++) {

  1559.                 s->current_picture.motion_val[1][s->block_index[i]][0] = 0;

  1560.                 s->current_picture.motion_val[1][s->block_index[i]][1] = 0;

  1561.             }

  1562.             v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.

  1563.             s->mb_intra          = 1;

  1564.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  1565.             fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);

  1566.             mb_has_coeffs = get_bits1(gb);

  1567.             if (mb_has_coeffs)

  1568.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1569.             v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);

  1570.             GET_MQUANT();

  1571.             s->current_picture.qscale_table[mb_pos] = mquant;

  1572.             /* Set DC scale - y and c use the same (not sure if necessary here) */

  1573.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  1574.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  1575.             dst_idx = 0;

  1576.             for (i = 0; i < 6; i++) {

  1577.                 v->a_avail = v->c_avail          = 0;

  1578.                 v->mb_type[0][s->block_index[i]] = 1;

  1579.                 s->dc_val[0][s->block_index[i]]  = 0;

  1580.                 dst_idx += i >> 2;

  1581.                 val = ((cbp >> (5 - i)) & 1);

  1582.                 if (i == 2 || i == 3 || !s->first_slice_line)

  1583.                     v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1584.                 if (i == 1 || i == 3 || s->mb_x)

  1585.                     v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1586. 

  1587.                 vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  1588.                                        (i & 4) ? v->codingset2 : v->codingset);

  1589.                 if (CONFIG_GRAY && (i>3) && (s->flags & CODEC_FLAG_GRAY)) continue;

  1590.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  1591.                 if (i < 4) {

  1592.                     stride_y = s->linesize << fieldtx;

  1593.                     off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;

  1594.                 } else {

  1595.                     stride_y = s->uvlinesize;

  1596.                     off = 0;

  1597.                 }

  1598.                 s->idsp.put_signed_pixels_clamped(s->block[i],

  1599.                                                   s->dest[dst_idx] + off,

  1600.                                                   stride_y);

  1601.                 //TODO: loop filter

  1602.             }

  1603. 

  1604.         } else { // inter MB

  1605.             mb_has_coeffs = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][3];

  1606.             if (mb_has_coeffs)

  1607.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1608.             if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {

  1609.                 v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);

  1610.             } else {

  1611.                 if ((ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV)

  1612.                     || (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV_FIELD)) {

  1613.                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  1614.                 }

  1615.             }

  1616.             s->mb_intra = v->is_intra[s->mb_x] = 0;

  1617.             for (i = 0; i < 6; i++)

  1618.                 v->mb_type[0][s->block_index[i]] = 0;

  1619.             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][1];

  1620.             /* for all motion vector read MVDATA and motion compensate each block */

  1621.             dst_idx = 0;

  1622.             if (fourmv) {

  1623.                 mvbp = v->fourmvbp;

  1624.                 for (i = 0; i < 4; i++) {

  1625.                     dmv_x = dmv_y = 0;

  1626.                     if (mvbp & (8 >> i))

  1627.                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  1628.                     ff_vc1_pred_mv_intfr(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0);

  1629.                     ff_vc1_mc_4mv_luma(v, i, 0, 0);

  1630.                 }

  1631.                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);

  1632.             } else if (twomv) {

  1633.                 mvbp  = v->twomvbp;

  1634.                 dmv_x = dmv_y = 0;

  1635.                 if (mvbp & 2) {

  1636.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  1637.                 }

  1638.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);

  1639.                 ff_vc1_mc_4mv_luma(v, 0, 0, 0);

  1640.                 ff_vc1_mc_4mv_luma(v, 1, 0, 0);

  1641.                 dmv_x = dmv_y = 0;

  1642.                 if (mvbp & 1) {

  1643.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  1644.                 }

  1645.                 ff_vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);

  1646.                 ff_vc1_mc_4mv_luma(v, 2, 0, 0);

  1647.                 ff_vc1_mc_4mv_luma(v, 3, 0, 0);

  1648.                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);

  1649.             } else {

  1650.                 mvbp = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][2];

  1651.                 dmv_x = dmv_y = 0;

  1652.                 if (mvbp) {

  1653.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  1654.                 }

  1655.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  1656.                 ff_vc1_mc_1mv(v, 0);

  1657.             }

  1658.             if (cbp)

  1659.                 GET_MQUANT();  // p. 227

  1660.             s->current_picture.qscale_table[mb_pos] = mquant;

  1661.             if (!v->ttmbf && cbp)

  1662.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1663.             for (i = 0; i < 6; i++) {

  1664.                 s->dc_val[0][s->block_index[i]] = 0;

  1665.                 dst_idx += i >> 2;

  1666.                 val = ((cbp >> (5 - i)) & 1);

  1667.                 if (!fieldtx)

  1668.                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1669.                 else

  1670.                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));

  1671.                 if (val) {

  1672.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  1673.                                              first_block, s->dest[dst_idx] + off,

  1674.                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),

  1675.                                              CONFIG_GRAY && (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  1676.                     block_cbp |= pat << (i << 2);

  1677.                     if (!v->ttmbf && ttmb < 8)

  1678.                         ttmb = -1;

  1679.                     first_block = 0;

  1680.                 }

  1681.             }

  1682.         }

  1683.     } else { // skipped

  1684.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  1685.         for (i = 0; i < 6; i++) {

  1686.             v->mb_type[0][s->block_index[i]] = 0;

  1687.             s->dc_val[0][s->block_index[i]] = 0;

  1688.         }

  1689.         s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  1690.         s->current_picture.qscale_table[mb_pos] = 0;

  1691.         v->blk_mv_type[s->block_index[0]] = 0;

  1692.         v->blk_mv_type[s->block_index[1]] = 0;

  1693.         v->blk_mv_type[s->block_index[2]] = 0;

  1694.         v->blk_mv_type[s->block_index[3]] = 0;

  1695.         ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  1696.         ff_vc1_mc_1mv(v, 0);

  1697.     }

  1698.     if (s->mb_x == s->mb_width - 1)

  1699.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0])*s->mb_stride);

  1700.     return 0;

  1701. }

  1702. 

  1703. static int vc1_decode_p_mb_intfi(VC1Context *v)

  1704. {

  1705.     MpegEncContext *s = &v->s;

  1706.     GetBitContext *gb = &s->gb;

  1707.     int i;

  1708.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1709.     int cbp = 0; /* cbp decoding stuff */

  1710.     int mqdiff, mquant; /* MB quantization */

  1711.     int ttmb = v->ttfrm; /* MB Transform type */

  1712. 

  1713.     int mb_has_coeffs = 1; /* last_flag */

  1714.     int dmv_x, dmv_y; /* Differential MV components */

  1715.     int val; /* temp values */

  1716.     int first_block = 1;

  1717.     int dst_idx, off;

  1718.     int pred_flag = 0;

  1719.     int block_cbp = 0, pat, block_tt = 0;

  1720.     int idx_mbmode = 0;

  1721. 

  1722.     mquant = v->pq; /* Lossy initialization */

  1723. 

  1724.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  1725.     if (idx_mbmode <= 1) { // intra MB

  1726.         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.

  1727.         s->mb_intra          = 1;

  1728.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  1729.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  1730.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_INTRA;

  1731.         GET_MQUANT();

  1732.         s->current_picture.qscale_table[mb_pos] = mquant;

  1733.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  1734.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  1735.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  1736.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  1737.         mb_has_coeffs = idx_mbmode & 1;

  1738.         if (mb_has_coeffs)

  1739.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  1740.         dst_idx = 0;

  1741.         for (i = 0; i < 6; i++) {

  1742.             v->a_avail = v->c_avail          = 0;

  1743.             v->mb_type[0][s->block_index[i]] = 1;

  1744.             s->dc_val[0][s->block_index[i]]  = 0;

  1745.             dst_idx += i >> 2;

  1746.             val = ((cbp >> (5 - i)) & 1);

  1747.             if (i == 2 || i == 3 || !s->first_slice_line)

  1748.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1749.             if (i == 1 || i == 3 || s->mb_x)

  1750.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1751. 

  1752.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  1753.                                    (i & 4) ? v->codingset2 : v->codingset);

  1754.             if (CONFIG_GRAY && (i>3) && (s->flags & CODEC_FLAG_GRAY))

  1755.                 continue;

  1756.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  1757.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1758.             s->idsp.put_signed_pixels_clamped(s->block[i],

  1759.                                               s->dest[dst_idx] + off,

  1760.                                               (i & 4) ? s->uvlinesize

  1761.                                                       : s->linesize);

  1762.             // TODO: loop filter

  1763.         }

  1764.     } else {

  1765.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  1766.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  1767.         for (i = 0; i < 6; i++)

  1768.             v->mb_type[0][s->block_index[i]] = 0;

  1769.         if (idx_mbmode <= 5) { // 1-MV

  1770.             dmv_x = dmv_y = pred_flag = 0;

  1771.             if (idx_mbmode & 1) {

  1772.                 get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  1773.             }

  1774.             ff_vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  1775.             ff_vc1_mc_1mv(v, 0);

  1776.             mb_has_coeffs = !(idx_mbmode & 2);

  1777.         } else { // 4-MV

  1778.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  1779.             for (i = 0; i < 4; i++) {

  1780.                 dmv_x = dmv_y = pred_flag = 0;

  1781.                 if (v->fourmvbp & (8 >> i))

  1782.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  1783.                 ff_vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  1784.                 ff_vc1_mc_4mv_luma(v, i, 0, 0);

  1785.             }

  1786.             ff_vc1_mc_4mv_chroma(v, 0);

  1787.             mb_has_coeffs = idx_mbmode & 1;

  1788.         }

  1789.         if (mb_has_coeffs)

  1790.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1791.         if (cbp) {

  1792.             GET_MQUANT();

  1793.         }

  1794.         s->current_picture.qscale_table[mb_pos] = mquant;

  1795.         if (!v->ttmbf && cbp) {

  1796.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1797.         }

  1798.         dst_idx = 0;

  1799.         for (i = 0; i < 6; i++) {

  1800.             s->dc_val[0][s->block_index[i]] = 0;

  1801.             dst_idx += i >> 2;

  1802.             val = ((cbp >> (5 - i)) & 1);

  1803.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  1804.             if (val) {

  1805.                 pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  1806.                                          first_block, s->dest[dst_idx] + off,

  1807.                                          (i & 4) ? s->uvlinesize : s->linesize,

  1808.                                          CONFIG_GRAY && (i & 4) && (s->flags & CODEC_FLAG_GRAY),

  1809.                                          &block_tt);

  1810.                 block_cbp |= pat << (i << 2);

  1811.                 if (!v->ttmbf && ttmb < 8)

  1812.                     ttmb = -1;

  1813.                 first_block = 0;

  1814.             }

  1815.         }

  1816.     }

  1817.     if (s->mb_x == s->mb_width - 1)

  1818.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  1819.     return 0;

  1820. }

  1821. 

  1822. /** Decode one B-frame MB (in Main profile)

  1823.  */

  1824. static void vc1_decode_b_mb(VC1Context *v)

  1825. {

  1826.     MpegEncContext *s = &v->s;

  1827.     GetBitContext *gb = &s->gb;

  1828.     int i, j;

  1829.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1830.     int cbp = 0; /* cbp decoding stuff */

  1831.     int mqdiff, mquant; /* MB quantization */

  1832.     int ttmb = v->ttfrm; /* MB Transform type */

  1833.     int mb_has_coeffs = 0; /* last_flag */

  1834.     int index, index1; /* LUT indexes */

  1835.     int val, sign; /* temp values */

  1836.     int first_block = 1;

  1837.     int dst_idx, off;

  1838.     int skipped, direct;

  1839.     int dmv_x[2], dmv_y[2];

  1840.     int bmvtype = BMV_TYPE_BACKWARD;

  1841. 

  1842.     mquant      = v->pq; /* lossy initialization */

  1843.     s->mb_intra = 0;

  1844. 

  1845.     if (v->dmb_is_raw)

  1846.         direct = get_bits1(gb);

  1847.     else

  1848.         direct = v->direct_mb_plane[mb_pos];

  1849.     if (v->skip_is_raw)

  1850.         skipped = get_bits1(gb);

  1851.     else

  1852.         skipped = v->s.mbskip_table[mb_pos];

  1853. 

  1854.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  1855.     for (i = 0; i < 6; i++) {

  1856.         v->mb_type[0][s->block_index[i]] = 0;

  1857.         s->dc_val[0][s->block_index[i]]  = 0;

  1858.     }

  1859.     s->current_picture.qscale_table[mb_pos] = 0;

  1860. 

  1861.     if (!direct) {

  1862.         if (!skipped) {

  1863.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  1864.             dmv_x[1] = dmv_x[0];

  1865.             dmv_y[1] = dmv_y[0];

  1866.         }

  1867.         if (skipped || !s->mb_intra) {

  1868.             bmvtype = decode012(gb);

  1869.             switch (bmvtype) {

  1870.             case 0:

  1871.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  1872.                 break;

  1873.             case 1:

  1874.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  1875.                 break;

  1876.             case 2:

  1877.                 bmvtype  = BMV_TYPE_INTERPOLATED;

  1878.                 dmv_x[0] = dmv_y[0] = 0;

  1879.             }

  1880.         }

  1881.     }

  1882.     for (i = 0; i < 6; i++)

  1883.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  1884. 

  1885.     if (skipped) {

  1886.         if (direct)

  1887.             bmvtype = BMV_TYPE_INTERPOLATED;

  1888.         ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1889.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1890.         return;

  1891.     }

  1892.     if (direct) {

  1893.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1894.         GET_MQUANT();

  1895.         s->mb_intra = 0;

  1896.         s->current_picture.qscale_table[mb_pos] = mquant;

  1897.         if (!v->ttmbf)

  1898.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1899.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  1900.         ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1901.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1902.     } else {

  1903.         if (!mb_has_coeffs && !s->mb_intra) {

  1904.             /* no coded blocks - effectively skipped */

  1905.             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1906.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1907.             return;

  1908.         }

  1909.         if (s->mb_intra && !mb_has_coeffs) {

  1910.             GET_MQUANT();

  1911.             s->current_picture.qscale_table[mb_pos] = mquant;

  1912.             s->ac_pred = get_bits1(gb);

  1913.             cbp = 0;

  1914.             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1915.         } else {

  1916.             if (bmvtype == BMV_TYPE_INTERPOLATED) {

  1917.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  1918.                 if (!mb_has_coeffs) {

  1919.                     /* interpolated skipped block */

  1920.                     ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1921.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1922.                     return;

  1923.                 }

  1924.             }

  1925.             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1926.             if (!s->mb_intra) {

  1927.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1928.             }

  1929.             if (s->mb_intra)

  1930.                 s->ac_pred = get_bits1(gb);

  1931.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1932.             GET_MQUANT();

  1933.             s->current_picture.qscale_table[mb_pos] = mquant;

  1934.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  1935.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1936.         }

  1937.     }

  1938.     dst_idx = 0;

  1939.     for (i = 0; i < 6; i++) {

  1940.         s->dc_val[0][s->block_index[i]] = 0;

  1941.         dst_idx += i >> 2;

  1942.         val = ((cbp >> (5 - i)) & 1);

  1943.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1944.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  1945.         if (s->mb_intra) {

  1946.             /* check if prediction blocks A and C are available */

  1947.             v->a_avail = v->c_avail = 0;

  1948.             if (i == 2 || i == 3 || !s->first_slice_line)

  1949.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1950.             if (i == 1 || i == 3 || s->mb_x)

  1951.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1952. 

  1953.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  1954.                                    (i & 4) ? v->codingset2 : v->codingset);

  1955.             if (CONFIG_GRAY && (i>3) && (s->flags & CODEC_FLAG_GRAY))

  1956.                 continue;

  1957.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  1958.             if (v->rangeredfrm)

  1959.                 for (j = 0; j < 64; j++)

  1960.                     s->block[i][j] <<= 1;

  1961.             s->idsp.put_signed_pixels_clamped(s->block[i],

  1962.                                               s->dest[dst_idx] + off,

  1963.                                               i & 4 ? s->uvlinesize

  1964.                                                     : s->linesize);

  1965.         } else if (val) {

  1966.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  1967.                                first_block, s->dest[dst_idx] + off,

  1968.                                (i & 4) ? s->uvlinesize : s->linesize,

  1969.                                CONFIG_GRAY && (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);

  1970.             if (!v->ttmbf && ttmb < 8)

  1971.                 ttmb = -1;

  1972.             first_block = 0;

  1973.         }

  1974.     }

  1975. }

  1976. 

  1977. /** Decode one B-frame MB (in interlaced field B picture)

  1978.  */

  1979. static void vc1_decode_b_mb_intfi(VC1Context *v)

  1980. {

  1981.     MpegEncContext *s = &v->s;

  1982.     GetBitContext *gb = &s->gb;

  1983.     int i, j;

  1984.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1985.     int cbp = 0; /* cbp decoding stuff */

  1986.     int mqdiff, mquant; /* MB quantization */

  1987.     int ttmb = v->ttfrm; /* MB Transform type */

  1988.     int mb_has_coeffs = 0; /* last_flag */

  1989.     int val; /* temp value */

  1990.     int first_block = 1;

  1991.     int dst_idx, off;

  1992.     int fwd;

  1993.     int dmv_x[2], dmv_y[2], pred_flag[2];

  1994.     int bmvtype = BMV_TYPE_BACKWARD;

  1995.     int idx_mbmode;

  1996. 

  1997.     mquant      = v->pq; /* Lossy initialization */

  1998.     s->mb_intra = 0;

  1999. 

  2000.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  2001.     if (idx_mbmode <= 1) { // intra MB

  2002.         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.

  2003.         s->mb_intra          = 1;

  2004.         s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  2005.         s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  2006.         s->current_picture.mb_type[mb_pos + v->mb_off]         = MB_TYPE_INTRA;

  2007.         GET_MQUANT();

  2008.         s->current_picture.qscale_table[mb_pos] = mquant;

  2009.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  2010.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  2011.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  2012.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  2013.         mb_has_coeffs = idx_mbmode & 1;

  2014.         if (mb_has_coeffs)

  2015.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  2016.         dst_idx = 0;

  2017.         for (i = 0; i < 6; i++) {

  2018.             v->a_avail = v->c_avail          = 0;

  2019.             v->mb_type[0][s->block_index[i]] = 1;

  2020.             s->dc_val[0][s->block_index[i]]  = 0;

  2021.             dst_idx += i >> 2;

  2022.             val = ((cbp >> (5 - i)) & 1);

  2023.             if (i == 2 || i == 3 || !s->first_slice_line)

  2024.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2025.             if (i == 1 || i == 3 || s->mb_x)

  2026.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2027. 

  2028.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  2029.                                    (i & 4) ? v->codingset2 : v->codingset);

  2030.             if (CONFIG_GRAY && (i>3) && (s->flags & CODEC_FLAG_GRAY))

  2031.                 continue;

  2032.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  2033.             if (v->rangeredfrm)

  2034.                 for (j = 0; j < 64; j++)

  2035.                     s->block[i][j] <<= 1;

  2036.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2037.             s->idsp.put_signed_pixels_clamped(s->block[i],

  2038.                                               s->dest[dst_idx] + off,

  2039.                                               (i & 4) ? s->uvlinesize

  2040.                                                       : s->linesize);

  2041.             // TODO: yet to perform loop filter

  2042.         }

  2043.     } else {

  2044.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  2045.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  2046.         for (i = 0; i < 6; i++)

  2047.             v->mb_type[0][s->block_index[i]] = 0;

  2048.         if (v->fmb_is_raw)

  2049.             fwd = v->forward_mb_plane[mb_pos] = get_bits1(gb);

  2050.         else

  2051.             fwd = v->forward_mb_plane[mb_pos];

  2052.         if (idx_mbmode <= 5) { // 1-MV

  2053.             int interpmvp = 0;

  2054.             dmv_x[0]     = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  2055.             pred_flag[0] = pred_flag[1] = 0;

  2056.             if (fwd)

  2057.                 bmvtype = BMV_TYPE_FORWARD;

  2058.             else {

  2059.                 bmvtype = decode012(gb);

  2060.                 switch (bmvtype) {

  2061.                 case 0:

  2062.                     bmvtype = BMV_TYPE_BACKWARD;

  2063.                     break;

  2064.                 case 1:

  2065.                     bmvtype = BMV_TYPE_DIRECT;

  2066.                     break;

  2067.                 case 2:

  2068.                     bmvtype   = BMV_TYPE_INTERPOLATED;

  2069.                     interpmvp = get_bits1(gb);

  2070.                 }

  2071.             }

  2072.             v->bmvtype = bmvtype;

  2073.             if (bmvtype != BMV_TYPE_DIRECT && idx_mbmode & 1) {

  2074.                 get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD], &dmv_y[bmvtype == BMV_TYPE_BACKWARD], &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  2075.             }

  2076.             if (interpmvp) {

  2077.                 get_mvdata_interlaced(v, &dmv_x[1], &dmv_y[1], &pred_flag[1]);

  2078.             }

  2079.             if (bmvtype == BMV_TYPE_DIRECT) {

  2080.                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  2081.                 dmv_x[1] = dmv_y[1] = pred_flag[0] = 0;

  2082.                 if (!s->next_picture_ptr->field_picture) {

  2083.                     av_log(s->avctx, AV_LOG_ERROR, "Mixed field/frame direct mode not supported\n");

  2084.                     return;

  2085.                 }

  2086.             }

  2087.             ff_vc1_pred_b_mv_intfi(v, 0, dmv_x, dmv_y, 1, pred_flag);

  2088.             vc1_b_mc(v, dmv_x, dmv_y, (bmvtype == BMV_TYPE_DIRECT), bmvtype);

  2089.             mb_has_coeffs = !(idx_mbmode & 2);

  2090.         } else { // 4-MV

  2091.             if (fwd)

  2092.                 bmvtype = BMV_TYPE_FORWARD;

  2093.             v->bmvtype  = bmvtype;

  2094.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  2095.             for (i = 0; i < 4; i++) {

  2096.                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  2097.                 dmv_x[1] = dmv_y[1] = pred_flag[1] = 0;

  2098.                 if (v->fourmvbp & (8 >> i)) {

  2099.                     get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD],

  2100.                                              &dmv_y[bmvtype == BMV_TYPE_BACKWARD],

  2101.                                          &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  2102.                 }

  2103.                 ff_vc1_pred_b_mv_intfi(v, i, dmv_x, dmv_y, 0, pred_flag);

  2104.                 ff_vc1_mc_4mv_luma(v, i, bmvtype == BMV_TYPE_BACKWARD, 0);

  2105.             }

  2106.             ff_vc1_mc_4mv_chroma(v, bmvtype == BMV_TYPE_BACKWARD);

  2107.             mb_has_coeffs = idx_mbmode & 1;

  2108.         }

  2109.         if (mb_has_coeffs)

  2110.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2111.         if (cbp) {

  2112.             GET_MQUANT();

  2113.         }

  2114.         s->current_picture.qscale_table[mb_pos] = mquant;

  2115.         if (!v->ttmbf && cbp) {

  2116.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  2117.         }

  2118.         dst_idx = 0;

  2119.         for (i = 0; i < 6; i++) {

  2120.             s->dc_val[0][s->block_index[i]] = 0;

  2121.             dst_idx += i >> 2;

  2122.             val = ((cbp >> (5 - i)) & 1);

  2123.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  2124.             if (val) {

  2125.                 vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  2126.                                    first_block, s->dest[dst_idx] + off,

  2127.                                    (i & 4) ? s->uvlinesize : s->linesize,

  2128.                                    CONFIG_GRAY && (i & 4) && (s->flags & CODEC_FLAG_GRAY), NULL);

  2129.                 if (!v->ttmbf && ttmb < 8)

  2130.                     ttmb = -1;

  2131.                 first_block = 0;

  2132.             }

  2133.         }

  2134.     }

  2135. }

  2136. 

  2137. /** Decode one B-frame MB (in interlaced frame B picture)

  2138.  */

  2139. static int vc1_decode_b_mb_intfr(VC1Context *v)

  2140. {

  2141.     MpegEncContext *s = &v->s;

  2142.     GetBitContext *gb = &s->gb;

  2143.     int i, j;

  2144.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2145.     int cbp = 0; /* cbp decoding stuff */

  2146.     int mqdiff, mquant; /* MB quantization */

  2147.     int ttmb = v->ttfrm; /* MB Transform type */

  2148.     int mvsw = 0; /* motion vector switch */

  2149.     int mb_has_coeffs = 1; /* last_flag */

  2150.     int dmv_x, dmv_y; /* Differential MV components */

  2151.     int val; /* temp value */

  2152.     int first_block = 1;

  2153.     int dst_idx, off;

  2154.     int skipped, direct, twomv = 0;

  2155.     int block_cbp = 0, pat, block_tt = 0;

  2156.     int idx_mbmode = 0, mvbp;

  2157.     int stride_y, fieldtx;

  2158.     int bmvtype = BMV_TYPE_BACKWARD;

  2159.     int dir, dir2;

  2160. 

  2161.     mquant = v->pq; /* Lossy initialization */

  2162.     s->mb_intra = 0;

  2163.     if (v->skip_is_raw)

  2164.         skipped = get_bits1(gb);

  2165.     else

  2166.         skipped = v->s.mbskip_table[mb_pos];

  2167. 

  2168.     if (!skipped) {

  2169.         idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2);

  2170.         if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {

  2171.             twomv = 1;

  2172.             v->blk_mv_type[s->block_index[0]] = 1;

  2173.             v->blk_mv_type[s->block_index[1]] = 1;

  2174.             v->blk_mv_type[s->block_index[2]] = 1;

  2175.             v->blk_mv_type[s->block_index[3]] = 1;

  2176.         } else {

  2177.             v->blk_mv_type[s->block_index[0]] = 0;

  2178.             v->blk_mv_type[s->block_index[1]] = 0;

  2179.             v->blk_mv_type[s->block_index[2]] = 0;

  2180.             v->blk_mv_type[s->block_index[3]] = 0;

  2181.         }

  2182.     }

  2183. 

  2184.     if (v->dmb_is_raw)

  2185.         direct = get_bits1(gb);

  2186.     else

  2187.         direct = v->direct_mb_plane[mb_pos];

  2188. 

  2189.     if (direct) {

  2190.         if (s->next_picture_ptr->field_picture)

  2191.             av_log(s->avctx, AV_LOG_WARNING, "Mixed frame/field direct mode not supported\n");

  2192.         s->mv[0][0][0] = s->current_picture.motion_val[0][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 0, s->quarter_sample);

  2193.         s->mv[0][0][1] = s->current_picture.motion_val[0][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 0, s->quarter_sample);

  2194.         s->mv[1][0][0] = s->current_picture.motion_val[1][s->block_index[0]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][0], v->bfraction, 1, s->quarter_sample);

  2195.         s->mv[1][0][1] = s->current_picture.motion_val[1][s->block_index[0]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[0]][1], v->bfraction, 1, s->quarter_sample);

  2196. 

  2197.         if (twomv) {

  2198.             s->mv[0][2][0] = s->current_picture.motion_val[0][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 0, s->quarter_sample);

  2199.             s->mv[0][2][1] = s->current_picture.motion_val[0][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 0, s->quarter_sample);

  2200.             s->mv[1][2][0] = s->current_picture.motion_val[1][s->block_index[2]][0] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][0], v->bfraction, 1, s->quarter_sample);

  2201.             s->mv[1][2][1] = s->current_picture.motion_val[1][s->block_index[2]][1] = scale_mv(s->next_picture.motion_val[1][s->block_index[2]][1], v->bfraction, 1, s->quarter_sample);

  2202. 

  2203.             for (i = 1; i < 4; i += 2) {

  2204.                 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][i-1][0];

  2205.                 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][i-1][1];

  2206.                 s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][i-1][0];

  2207.                 s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][i-1][1];

  2208.             }

  2209.         } else {

  2210.             for (i = 1; i < 4; i++) {

  2211.                 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][0][0];

  2212.                 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][0][1];

  2213.                 s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][0][0];

  2214.                 s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][0][1];

  2215.             }

  2216.         }

  2217.     }

  2218. 

  2219.     if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB

  2220.         for (i = 0; i < 4; i++) {

  2221.             s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = 0;

  2222.             s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = 0;

  2223.             s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = 0;

  2224.             s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = 0;

  2225.         }

  2226.         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.

  2227.         s->mb_intra          = 1;

  2228.         s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  2229.         fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);

  2230.         mb_has_coeffs = get_bits1(gb);

  2231.         if (mb_has_coeffs)

  2232.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2233.         v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);

  2234.         GET_MQUANT();

  2235.         s->current_picture.qscale_table[mb_pos] = mquant;

  2236.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  2237.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  2238.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  2239.         dst_idx = 0;

  2240.         for (i = 0; i < 6; i++) {

  2241.             v->a_avail = v->c_avail          = 0;

  2242.             v->mb_type[0][s->block_index[i]] = 1;

  2243.             s->dc_val[0][s->block_index[i]]  = 0;

  2244.             dst_idx += i >> 2;

  2245.             val = ((cbp >> (5 - i)) & 1);

  2246.             if (i == 2 || i == 3 || !s->first_slice_line)

  2247.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2248.             if (i == 1 || i == 3 || s->mb_x)

  2249.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2250. 

  2251.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  2252.                                    (i & 4) ? v->codingset2 : v->codingset);

  2253.             if (CONFIG_GRAY && i > 3 && (s->flags & CODEC_FLAG_GRAY))

  2254.                 continue;

  2255.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  2256.             if (i < 4) {

  2257.                 stride_y = s->linesize << fieldtx;

  2258.                 off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;

  2259.             } else {

  2260.                 stride_y = s->uvlinesize;

  2261.                 off = 0;

  2262.             }

  2263.             s->idsp.put_signed_pixels_clamped(s->block[i],

  2264.                                               s->dest[dst_idx] + off,

  2265.                                               stride_y);

  2266.         }

  2267.     } else {

  2268.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  2269.         if (!direct) {

  2270.             if (skipped || !s->mb_intra) {

  2271.                 bmvtype = decode012(gb);

  2272.                 switch (bmvtype) {

  2273.                 case 0:

  2274.                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  2275.                     break;

  2276.                 case 1:

  2277.                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  2278.                     break;

  2279.                 case 2:

  2280.                     bmvtype  = BMV_TYPE_INTERPOLATED;

  2281.                 }

  2282.             }

  2283. 

  2284.             if (twomv && bmvtype != BMV_TYPE_INTERPOLATED)

  2285.                 mvsw = get_bits1(gb);

  2286.         }

  2287. 

  2288.         if (!skipped) { // inter MB

  2289.             mb_has_coeffs = ff_vc1_mbmode_intfrp[0][idx_mbmode][3];

  2290.             if (mb_has_coeffs)

  2291.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2292.             if (!direct) {

  2293.                 if (bmvtype == BMV_TYPE_INTERPOLATED && twomv) {

  2294.                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  2295.                 } else if (bmvtype == BMV_TYPE_INTERPOLATED || twomv) {

  2296.                     v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);

  2297.                 }

  2298.             }

  2299. 

  2300.             for (i = 0; i < 6; i++)

  2301.                 v->mb_type[0][s->block_index[i]] = 0;

  2302.             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[0][idx_mbmode][1];

  2303.             /* for all motion vector read MVDATA and motion compensate each block */

  2304.             dst_idx = 0;

  2305.             if (direct) {

  2306.                 if (twomv) {

  2307.                     for (i = 0; i < 4; i++) {

  2308.                         ff_vc1_mc_4mv_luma(v, i, 0, 0);

  2309.                         ff_vc1_mc_4mv_luma(v, i, 1, 1);

  2310.                     }

  2311.                     ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);

  2312.                     ff_vc1_mc_4mv_chroma4(v, 1, 1, 1);

  2313.                 } else {

  2314.                     ff_vc1_mc_1mv(v, 0);

  2315.                     ff_vc1_interp_mc(v);

  2316.                 }

  2317.             } else if (twomv && bmvtype == BMV_TYPE_INTERPOLATED) {

  2318.                 mvbp = v->fourmvbp;

  2319.                 for (i = 0; i < 4; i++) {

  2320.                     dir = i==1 || i==3;

  2321.                     dmv_x = dmv_y = 0;

  2322.                     val = ((mvbp >> (3 - i)) & 1);

  2323.                     if (val)

  2324.                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2325.                     j = i > 1 ? 2 : 0;

  2326.                     ff_vc1_pred_mv_intfr(v, j, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);

  2327.                     ff_vc1_mc_4mv_luma(v, j, dir, dir);

  2328.                     ff_vc1_mc_4mv_luma(v, j+1, dir, dir);

  2329.                 }

  2330. 

  2331.                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);

  2332.                 ff_vc1_mc_4mv_chroma4(v, 1, 1, 1);

  2333.             } else if (bmvtype == BMV_TYPE_INTERPOLATED) {

  2334.                 mvbp = v->twomvbp;

  2335.                 dmv_x = dmv_y = 0;

  2336.                 if (mvbp & 2)

  2337.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2338. 

  2339.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  2340.                 ff_vc1_mc_1mv(v, 0);

  2341. 

  2342.                 dmv_x = dmv_y = 0;

  2343.                 if (mvbp & 1)

  2344.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2345. 

  2346.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 1);

  2347.                 ff_vc1_interp_mc(v);

  2348.             } else if (twomv) {

  2349.                 dir = bmvtype == BMV_TYPE_BACKWARD;

  2350.                 dir2 = dir;

  2351.                 if (mvsw)

  2352.                     dir2 = !dir;

  2353.                 mvbp = v->twomvbp;

  2354.                 dmv_x = dmv_y = 0;

  2355.                 if (mvbp & 2)

  2356.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2357.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);

  2358. 

  2359.                 dmv_x = dmv_y = 0;

  2360.                 if (mvbp & 1)

  2361.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2362.                 ff_vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir2);

  2363. 

  2364.                 if (mvsw) {

  2365.                     for (i = 0; i < 2; i++) {

  2366.                         s->mv[dir][i+2][0] = s->mv[dir][i][0] = s->current_picture.motion_val[dir][s->block_index[i+2]][0] = s->current_picture.motion_val[dir][s->block_index[i]][0];

  2367.                         s->mv[dir][i+2][1] = s->mv[dir][i][1] = s->current_picture.motion_val[dir][s->block_index[i+2]][1] = s->current_picture.motion_val[dir][s->block_index[i]][1];

  2368.                         s->mv[dir2][i+2][0] = s->mv[dir2][i][0] = s->current_picture.motion_val[dir2][s->block_index[i]][0] = s->current_picture.motion_val[dir2][s->block_index[i+2]][0];

  2369.                         s->mv[dir2][i+2][1] = s->mv[dir2][i][1] = s->current_picture.motion_val[dir2][s->block_index[i]][1] = s->current_picture.motion_val[dir2][s->block_index[i+2]][1];

  2370.                     }

  2371.                 } else {

  2372.                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);

  2373.                     ff_vc1_pred_mv_intfr(v, 2, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);

  2374.                 }

  2375. 

  2376.                 ff_vc1_mc_4mv_luma(v, 0, dir, 0);

  2377.                 ff_vc1_mc_4mv_luma(v, 1, dir, 0);

  2378.                 ff_vc1_mc_4mv_luma(v, 2, dir2, 0);

  2379.                 ff_vc1_mc_4mv_luma(v, 3, dir2, 0);

  2380.                 ff_vc1_mc_4mv_chroma4(v, dir, dir2, 0);

  2381.             } else {

  2382.                 dir = bmvtype == BMV_TYPE_BACKWARD;

  2383. 

  2384.                 mvbp = ff_vc1_mbmode_intfrp[0][idx_mbmode][2];

  2385.                 dmv_x = dmv_y = 0;

  2386.                 if (mvbp)

  2387.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2388. 

  2389.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], dir);

  2390.                 v->blk_mv_type[s->block_index[0]] = 1;

  2391.                 v->blk_mv_type[s->block_index[1]] = 1;

  2392.                 v->blk_mv_type[s->block_index[2]] = 1;

  2393.                 v->blk_mv_type[s->block_index[3]] = 1;

  2394.                 ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);

  2395.                 for (i = 0; i < 2; i++) {

  2396.                     s->mv[!dir][i+2][0] = s->mv[!dir][i][0] = s->current_picture.motion_val[!dir][s->block_index[i+2]][0] = s->current_picture.motion_val[!dir][s->block_index[i]][0];

  2397.                     s->mv[!dir][i+2][1] = s->mv[!dir][i][1] = s->current_picture.motion_val[!dir][s->block_index[i+2]][1] = s->current_picture.motion_val[!dir][s->block_index[i]][1];

  2398.                 }

  2399.                 ff_vc1_mc_1mv(v, dir);

  2400.             }

  2401. 

  2402.             if (cbp)

  2403.                 GET_MQUANT();  // p. 227

  2404.             s->current_picture.qscale_table[mb_pos] = mquant;

  2405.             if (!v->ttmbf && cbp)

  2406.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  2407.             for (i = 0; i < 6; i++) {

  2408.                 s->dc_val[0][s->block_index[i]] = 0;

  2409.                 dst_idx += i >> 2;

  2410.                 val = ((cbp >> (5 - i)) & 1);

  2411.                 if (!fieldtx)

  2412.                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2413.                 else

  2414.                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));

  2415.                 if (val) {

  2416.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  2417.                                              first_block, s->dest[dst_idx] + off,

  2418.                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),

  2419.                                              CONFIG_GRAY && (i & 4) && (s->flags & CODEC_FLAG_GRAY), &block_tt);

  2420.                     block_cbp |= pat << (i << 2);

  2421.                     if (!v->ttmbf && ttmb < 8)

  2422.                         ttmb = -1;

  2423.                     first_block = 0;

  2424.                 }

  2425.             }

  2426. 

  2427.         } else { // skipped

  2428.             dir = 0;

  2429.             for (i = 0; i < 6; i++) {

  2430.                 v->mb_type[0][s->block_index[i]] = 0;

  2431.                 s->dc_val[0][s->block_index[i]] = 0;

  2432.             }

  2433.             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  2434.             s->current_picture.qscale_table[mb_pos] = 0;

  2435.             v->blk_mv_type[s->block_index[0]] = 0;

  2436.             v->blk_mv_type[s->block_index[1]] = 0;

  2437.             v->blk_mv_type[s->block_index[2]] = 0;

  2438.             v->blk_mv_type[s->block_index[3]] = 0;

  2439. 

  2440.             if (!direct) {

  2441.                 if (bmvtype == BMV_TYPE_INTERPOLATED) {

  2442.                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  2443.                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 1);

  2444.                 } else {

  2445.                     dir = bmvtype == BMV_TYPE_BACKWARD;

  2446.                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], dir);

  2447.                     if (mvsw) {

  2448.                         int dir2 = dir;

  2449.                         if (mvsw)

  2450.                             dir2 = !dir;

  2451.                         for (i = 0; i < 2; i++) {

  2452.                             s->mv[dir][i+2][0] = s->mv[dir][i][0] = s->current_picture.motion_val[dir][s->block_index[i+2]][0] = s->current_picture.motion_val[dir][s->block_index[i]][0];

  2453.                             s->mv[dir][i+2][1] = s->mv[dir][i][1] = s->current_picture.motion_val[dir][s->block_index[i+2]][1] = s->current_picture.motion_val[dir][s->block_index[i]][1];

  2454.                             s->mv[dir2][i+2][0] = s->mv[dir2][i][0] = s->current_picture.motion_val[dir2][s->block_index[i]][0] = s->current_picture.motion_val[dir2][s->block_index[i+2]][0];

  2455.                             s->mv[dir2][i+2][1] = s->mv[dir2][i][1] = s->current_picture.motion_val[dir2][s->block_index[i]][1] = s->current_picture.motion_val[dir2][s->block_index[i+2]][1];

  2456.                         }

  2457.                     } else {

  2458.                         v->blk_mv_type[s->block_index[0]] = 1;

  2459.                         v->blk_mv_type[s->block_index[1]] = 1;

  2460.                         v->blk_mv_type[s->block_index[2]] = 1;

  2461.                         v->blk_mv_type[s->block_index[3]] = 1;

  2462.                         ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);

  2463.                         for (i = 0; i < 2; i++) {

  2464.                             s->mv[!dir][i+2][0] = s->mv[!dir][i][0] = s->current_picture.motion_val[!dir][s->block_index[i+2]][0] = s->current_picture.motion_val[!dir][s->block_index[i]][0];

  2465.                             s->mv[!dir][i+2][1] = s->mv[!dir][i][1] = s->current_picture.motion_val[!dir][s->block_index[i+2]][1] = s->current_picture.motion_val[!dir][s->block_index[i]][1];

  2466.                         }

  2467.                     }

  2468.                 }

  2469.             }

  2470. 

  2471.             ff_vc1_mc_1mv(v, dir);

  2472.             if (direct || bmvtype == BMV_TYPE_INTERPOLATED) {

  2473.                 ff_vc1_interp_mc(v);

  2474.             }

  2475.         }

  2476.     }

  2477.     if (s->mb_x == s->mb_width - 1)

  2478.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  2479.     v->cbp[s->mb_x]      = block_cbp;

  2480.     v->ttblk[s->mb_x]    = block_tt;

  2481.     return 0;

  2482. }

  2483. 

  2484. /** Decode blocks of I-frame

  2485.  */

  2486. static void vc1_decode_i_blocks(VC1Context *v)

  2487. {

  2488.     int k, j;

  2489.     MpegEncContext *s = &v->s;

  2490.     int cbp, val;

  2491.     uint8_t *coded_val;

  2492.     int mb_pos;

  2493. 

  2494.     /* select codingmode used for VLC tables selection */

  2495.     switch (v->y_ac_table_index) {

  2496.     case 0:

  2497.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2498.         break;

  2499.     case 1:

  2500.         v->codingset = CS_HIGH_MOT_INTRA;

  2501.         break;

  2502.     case 2:

  2503.         v->codingset = CS_MID_RATE_INTRA;

  2504.         break;

  2505.     }

  2506. 

  2507.     switch (v->c_ac_table_index) {

  2508.     case 0:

  2509.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2510.         break;

  2511.     case 1:

  2512.         v->codingset2 = CS_HIGH_MOT_INTER;

  2513.         break;

  2514.     case 2:

  2515.         v->codingset2 = CS_MID_RATE_INTER;

  2516.         break;

  2517.     }

  2518. 

  2519.     /* Set DC scale - y and c use the same */

  2520.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  2521.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  2522. 

  2523.     //do frame decode

  2524.     s->mb_x = s->mb_y = 0;

  2525.     s->mb_intra         = 1;

  2526.     s->first_slice_line = 1;

  2527.     for (s->mb_y = 0; s->mb_y < s->end_mb_y; s->mb_y++) {

  2528.         s->mb_x = 0;

  2529.         init_block_index(v);

  2530.         for (; s->mb_x < v->end_mb_x; s->mb_x++) {

  2531.             uint8_t *dst[6];

  2532.             ff_update_block_index(s);

  2533.             dst[0] = s->dest[0];

  2534.             dst[1] = dst[0] + 8;

  2535.             dst[2] = s->dest[0] + s->linesize * 8;

  2536.             dst[3] = dst[2] + 8;

  2537.             dst[4] = s->dest[1];

  2538.             dst[5] = s->dest[2];

  2539.             s->bdsp.clear_blocks(s->block[0]);

  2540.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  2541.             s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  2542.             s->current_picture.qscale_table[mb_pos]                = v->pq;

  2543.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  2544.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  2545. 

  2546.             // do actual MB decoding and displaying

  2547.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  2548.             v->s.ac_pred = get_bits1(&v->s.gb);

  2549. 

  2550.             for (k = 0; k < 6; k++) {

  2551.                 val = ((cbp >> (5 - k)) & 1);

  2552. 

  2553.                 if (k < 4) {

  2554.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  2555.                     val        = val ^ pred;

  2556.                     *coded_val = val;

  2557.                 }

  2558.                 cbp |= val << (5 - k);

  2559. 

  2560.                 vc1_decode_i_block(v, s->block[k], k, val, (k < 4) ? v->codingset : v->codingset2);

  2561. 

  2562.                 if (CONFIG_GRAY && k > 3 && (s->flags & CODEC_FLAG_GRAY))

  2563.                     continue;

  2564.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[k]);

  2565.                 if (v->pq >= 9 && v->overlap) {

  2566.                     if (v->rangeredfrm)

  2567.                         for (j = 0; j < 64; j++)

  2568.                             s->block[k][j] <<= 1;

  2569.                     s->idsp.put_signed_pixels_clamped(s->block[k], dst[k],

  2570.                                                       k & 4 ? s->uvlinesize

  2571.                                                             : s->linesize);

  2572.                 } else {

  2573.                     if (v->rangeredfrm)

  2574.                         for (j = 0; j < 64; j++)

  2575.                             s->block[k][j] = (s->block[k][j] - 64) << 1;

  2576.                     s->idsp.put_pixels_clamped(s->block[k], dst[k],

  2577.                                                k & 4 ? s->uvlinesize

  2578.                                                      : s->linesize);

  2579.                 }

  2580.             }

  2581. 

  2582.             if (v->pq >= 9 && v->overlap) {

  2583.                 if (s->mb_x) {

  2584.                     v->vc1dsp.vc1_h_overlap(s->dest[0], s->linesize);

  2585.                     v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  2586.                     if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY)) {

  2587.                         v->vc1dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  2588.                         v->vc1dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  2589.                     }

  2590.                 }

  2591.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  2592.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  2593.                 if (!s->first_slice_line) {

  2594.                     v->vc1dsp.vc1_v_overlap(s->dest[0], s->linesize);

  2595.                     v->vc1dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  2596.                     if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY)) {

  2597.                         v->vc1dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  2598.                         v->vc1dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  2599.                     }

  2600.                 }

  2601.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  2602.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  2603.             }

  2604.             if (v->s.loop_filter)

  2605.                 ff_vc1_loop_filter_iblk(v, v->pq);

  2606. 

  2607.             if (get_bits_count(&s->gb) > v->bits) {

  2608.                 ff_er_add_slice(&s->er, 0, 0, s->mb_x, s->mb_y, ER_MB_ERROR);

  2609.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  2610.                        get_bits_count(&s->gb), v->bits);

  2611.                 return;

  2612.             }

  2613.         }

  2614.         if (!v->s.loop_filter)

  2615.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  2616.         else if (s->mb_y)

  2617.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  2618. 

  2619.         s->first_slice_line = 0;

  2620.     }

  2621.     if (v->s.loop_filter)

  2622.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  2623. 

  2624.     /* This is intentionally mb_height and not end_mb_y - unlike in advanced

  2625.      * profile, these only differ are when decoding MSS2 rectangles. */

  2626.     ff_er_add_slice(&s->er, 0, 0, s->mb_width - 1, s->mb_height - 1, ER_MB_END);

  2627. }

  2628. 

  2629. /** Decode blocks of I-frame for advanced profile

  2630.  */

  2631. static void vc1_decode_i_blocks_adv(VC1Context *v)

  2632. {

  2633.     int k;

  2634.     MpegEncContext *s = &v->s;

  2635.     int cbp, val;

  2636.     uint8_t *coded_val;

  2637.     int mb_pos;

  2638.     int mquant = v->pq;

  2639.     int mqdiff;

  2640.     GetBitContext *gb = &s->gb;

  2641. 

  2642.     /* select codingmode used for VLC tables selection */

  2643.     switch (v->y_ac_table_index) {

  2644.     case 0:

  2645.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2646.         break;

  2647.     case 1:

  2648.         v->codingset = CS_HIGH_MOT_INTRA;

  2649.         break;

  2650.     case 2:

  2651.         v->codingset = CS_MID_RATE_INTRA;

  2652.         break;

  2653.     }

  2654. 

  2655.     switch (v->c_ac_table_index) {

  2656.     case 0:

  2657.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2658.         break;

  2659.     case 1:

  2660.         v->codingset2 = CS_HIGH_MOT_INTER;

  2661.         break;

  2662.     case 2:

  2663.         v->codingset2 = CS_MID_RATE_INTER;

  2664.         break;

  2665.     }

  2666. 

  2667.     // do frame decode

  2668.     s->mb_x             = s->mb_y = 0;

  2669.     s->mb_intra         = 1;

  2670.     s->first_slice_line = 1;

  2671.     s->mb_y             = s->start_mb_y;

  2672.     if (s->start_mb_y) {

  2673.         s->mb_x = 0;

  2674.         init_block_index(v);

  2675.         memset(&s->coded_block[s->block_index[0] - s->b8_stride], 0,

  2676.                (1 + s->b8_stride) * sizeof(*s->coded_block));

  2677.     }

  2678.     for (; s->mb_y < s->end_mb_y; s->mb_y++) {

  2679.         s->mb_x = 0;

  2680.         init_block_index(v);

  2681.         for (;s->mb_x < s->mb_width; s->mb_x++) {

  2682.             int16_t (*block)[64] = v->block[v->cur_blk_idx];

  2683.             ff_update_block_index(s);

  2684.             s->bdsp.clear_blocks(block[0]);

  2685.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2686.             s->current_picture.mb_type[mb_pos + v->mb_off]                         = MB_TYPE_INTRA;

  2687.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  2688.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  2689. 

  2690.             // do actual MB decoding and displaying

  2691.             if (v->fieldtx_is_raw)

  2692.                 v->fieldtx_plane[mb_pos] = get_bits1(&v->s.gb);

  2693.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  2694.             if ( v->acpred_is_raw)

  2695.                 v->s.ac_pred = get_bits1(&v->s.gb);

  2696.             else

  2697.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  2698. 

  2699.             if (v->condover == CONDOVER_SELECT && v->overflg_is_raw)

  2700.                 v->over_flags_plane[mb_pos] = get_bits1(&v->s.gb);

  2701. 

  2702.             GET_MQUANT();

  2703. 

  2704.             s->current_picture.qscale_table[mb_pos] = mquant;

  2705.             /* Set DC scale - y and c use the same */

  2706.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  2707.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  2708. 

  2709.             for (k = 0; k < 6; k++) {

  2710.                 val = ((cbp >> (5 - k)) & 1);

  2711. 

  2712.                 if (k < 4) {

  2713.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  2714.                     val        = val ^ pred;

  2715.                     *coded_val = val;

  2716.                 }

  2717.                 cbp |= val << (5 - k);

  2718. 

  2719.                 v->a_avail = !s->first_slice_line || (k == 2 || k == 3);

  2720.                 v->c_avail = !!s->mb_x || (k == 1 || k == 3);

  2721. 

  2722.                 vc1_decode_i_block_adv(v, block[k], k, val,

  2723.                                        (k < 4) ? v->codingset : v->codingset2, mquant);

  2724. 

  2725.                 if (CONFIG_GRAY && k > 3 && (s->flags & CODEC_FLAG_GRAY))

  2726.                     continue;

  2727.                 v->vc1dsp.vc1_inv_trans_8x8(block[k]);

  2728.             }

  2729. 

  2730.             ff_vc1_smooth_overlap_filter_iblk(v);

  2731.             vc1_put_signed_blocks_clamped(v);

  2732.             if (v->s.loop_filter)

  2733.                 ff_vc1_loop_filter_iblk_delayed(v, v->pq);

  2734. 

  2735.             if (get_bits_count(&s->gb) > v->bits) {

  2736.                 // TODO: may need modification to handle slice coding

  2737.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  2738.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  2739.                        get_bits_count(&s->gb), v->bits);

  2740.                 return;

  2741.             }

  2742.         }

  2743.         if (!v->s.loop_filter)

  2744.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  2745.         else if (s->mb_y)

  2746.             ff_mpeg_draw_horiz_band(s, (s->mb_y-1) * 16, 16);

  2747.         s->first_slice_line = 0;

  2748.     }

  2749. 

  2750.     /* raw bottom MB row */

  2751.     s->mb_x = 0;

  2752.     init_block_index(v);

  2753.     for (; s->mb_x < s->mb_width; s->mb_x++) {

  2754.         ff_update_block_index(s);

  2755.         vc1_put_signed_blocks_clamped(v);

  2756.         if (v->s.loop_filter)

  2757.             ff_vc1_loop_filter_iblk_delayed(v, v->pq);

  2758.     }

  2759.     if (v->s.loop_filter)

  2760.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  2761.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  2762.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  2763. }

  2764. 

  2765. static void vc1_decode_p_blocks(VC1Context *v)

  2766. {

  2767.     MpegEncContext *s = &v->s;

  2768.     int apply_loop_filter;

  2769. 

  2770.     /* select codingmode used for VLC tables selection */

  2771.     switch (v->c_ac_table_index) {

  2772.     case 0:

  2773.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2774.         break;

  2775.     case 1:

  2776.         v->codingset = CS_HIGH_MOT_INTRA;

  2777.         break;

  2778.     case 2:

  2779.         v->codingset = CS_MID_RATE_INTRA;

  2780.         break;

  2781.     }

  2782. 

  2783.     switch (v->c_ac_table_index) {

  2784.     case 0:

  2785.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2786.         break;

  2787.     case 1:

  2788.         v->codingset2 = CS_HIGH_MOT_INTER;

  2789.         break;

  2790.     case 2:

  2791.         v->codingset2 = CS_MID_RATE_INTER;

  2792.         break;

  2793.     }

  2794. 

  2795.     apply_loop_filter   = s->loop_filter && !(s->avctx->skip_loop_filter >= AVDISCARD_NONKEY) &&

  2796.                           v->fcm == PROGRESSIVE;

  2797.     s->first_slice_line = 1;

  2798.     memset(v->cbp_base, 0, sizeof(v->cbp_base[0])*2*s->mb_stride);

  2799.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  2800.         s->mb_x = 0;

  2801.         init_block_index(v);

  2802.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  2803.             ff_update_block_index(s);

  2804. 

  2805.             if (v->fcm == ILACE_FIELD)

  2806.                 vc1_decode_p_mb_intfi(v);

  2807.             else if (v->fcm == ILACE_FRAME)

  2808.                 vc1_decode_p_mb_intfr(v);

  2809.             else vc1_decode_p_mb(v);

  2810.             if (s->mb_y != s->start_mb_y && apply_loop_filter)

  2811.                 ff_vc1_apply_p_loop_filter(v);

  2812.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  2813.                 // TODO: may need modification to handle slice coding

  2814.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  2815.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  2816.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  2817.                 return;

  2818.             }

  2819.         }

  2820.         memmove(v->cbp_base,      v->cbp,      sizeof(v->cbp_base[0])      * s->mb_stride);

  2821.         memmove(v->ttblk_base,    v->ttblk,    sizeof(v->ttblk_base[0])    * s->mb_stride);

  2822.         memmove(v->is_intra_base, v->is_intra, sizeof(v->is_intra_base[0]) * s->mb_stride);

  2823.         memmove(v->luma_mv_base,  v->luma_mv,  sizeof(v->luma_mv_base[0])  * s->mb_stride);

  2824.         if (s->mb_y != s->start_mb_y)

  2825.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  2826.         s->first_slice_line = 0;

  2827.     }

  2828.     if (apply_loop_filter) {

  2829.         s->mb_x = 0;

  2830.         init_block_index(v);

  2831.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  2832.             ff_update_block_index(s);

  2833.             ff_vc1_apply_p_loop_filter(v);

  2834.         }

  2835.     }

  2836.     if (s->end_mb_y >= s->start_mb_y)

  2837.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  2838.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  2839.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  2840. }

  2841. 

  2842. static void vc1_decode_b_blocks(VC1Context *v)

  2843. {

  2844.     MpegEncContext *s = &v->s;

  2845. 

  2846.     /* select codingmode used for VLC tables selection */

  2847.     switch (v->c_ac_table_index) {

  2848.     case 0:

  2849.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2850.         break;

  2851.     case 1:

  2852.         v->codingset = CS_HIGH_MOT_INTRA;

  2853.         break;

  2854.     case 2:

  2855.         v->codingset = CS_MID_RATE_INTRA;

  2856.         break;

  2857.     }

  2858. 

  2859.     switch (v->c_ac_table_index) {

  2860.     case 0:

  2861.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2862.         break;

  2863.     case 1:

  2864.         v->codingset2 = CS_HIGH_MOT_INTER;

  2865.         break;

  2866.     case 2:

  2867.         v->codingset2 = CS_MID_RATE_INTER;

  2868.         break;

  2869.     }

  2870. 

  2871.     s->first_slice_line = 1;

  2872.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  2873.         s->mb_x = 0;

  2874.         init_block_index(v);

  2875.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  2876.             ff_update_block_index(s);

  2877. 

  2878.             if (v->fcm == ILACE_FIELD)

  2879.                 vc1_decode_b_mb_intfi(v);

  2880.             else if (v->fcm == ILACE_FRAME)

  2881.                 vc1_decode_b_mb_intfr(v);

  2882.             else

  2883.                 vc1_decode_b_mb(v);

  2884.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  2885.                 // TODO: may need modification to handle slice coding

  2886.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  2887.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  2888.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  2889.                 return;

  2890.             }

  2891.             if (v->s.loop_filter)

  2892.                 ff_vc1_loop_filter_iblk(v, v->pq);

  2893.         }

  2894.         if (!v->s.loop_filter)

  2895.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  2896.         else if (s->mb_y)

  2897.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  2898.         s->first_slice_line = 0;

  2899.     }

  2900.     if (v->s.loop_filter)

  2901.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  2902.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  2903.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  2904. }

  2905. 

  2906. static void vc1_decode_skip_blocks(VC1Context *v)

  2907. {

  2908.     MpegEncContext *s = &v->s;

  2909. 

  2910.     if (!v->s.last_picture.f->data[0])

  2911.         return;

  2912. 

  2913.     ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_width - 1, s->end_mb_y - 1, ER_MB_END);

  2914.     s->first_slice_line = 1;

  2915.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  2916.         s->mb_x = 0;

  2917.         init_block_index(v);

  2918.         ff_update_block_index(s);

  2919.         memcpy(s->dest[0], s->last_picture.f->data[0] + s->mb_y * 16 * s->linesize,   s->linesize   * 16);

  2920.         memcpy(s->dest[1], s->last_picture.f->data[1] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  2921.         memcpy(s->dest[2], s->last_picture.f->data[2] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  2922.         ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  2923.         s->first_slice_line = 0;

  2924.     }

  2925.     s->pict_type = AV_PICTURE_TYPE_P;

  2926. }

  2927. 

  2928. void ff_vc1_decode_blocks(VC1Context *v)

  2929. {

  2930. 

  2931.     v->s.esc3_level_length = 0;

  2932.     if (v->x8_type) {

  2933.         ff_intrax8_decode_picture(&v->x8, 2*v->pq + v->halfpq, v->pq * !v->pquantizer);

  2934.     } else {

  2935.         v->cur_blk_idx     =  0;

  2936.         v->left_blk_idx    = -1;

  2937.         v->topleft_blk_idx =  1;

  2938.         v->top_blk_idx     =  2;

  2939.         switch (v->s.pict_type) {

  2940.         case AV_PICTURE_TYPE_I:

  2941.             if (v->profile == PROFILE_ADVANCED)

  2942.                 vc1_decode_i_blocks_adv(v);

  2943.             else

  2944.                 vc1_decode_i_blocks(v);

  2945.             break;

  2946.         case AV_PICTURE_TYPE_P:

  2947.             if (v->p_frame_skipped)

  2948.                 vc1_decode_skip_blocks(v);

  2949.             else

  2950.                 vc1_decode_p_blocks(v);

  2951.             break;

  2952.         case AV_PICTURE_TYPE_B:

  2953.             if (v->bi_type) {

  2954.                 if (v->profile == PROFILE_ADVANCED)

  2955.                     vc1_decode_i_blocks_adv(v);

  2956.                 else

  2957.                     vc1_decode_i_blocks(v);

  2958.             } else

  2959.                 vc1_decode_b_blocks(v);

  2960.             break;

  2961.         }

  2962.     }

  2963. }