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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.     uint8_t *dest;

  73.     int block_count = CONFIG_GRAY && (s->avctx->flags & AV_CODEC_FLAG_GRAY) ? 4 : 6;

  74.     int fieldtx = 0;

  75.     int i;

  76. 

  77.     /* The put pixels loop is one MB row and one MB column behind the decoding

  78.      * loop because we can only put pixels when overlap filtering is done. For

  79.      * interlaced frame pictures, however, the put pixels loop is only one

  80.      * column behind the decoding loop as interlaced frame pictures only need

  81.      * horizontal overlap filtering. */

  82.     if (!s->first_slice_line && v->fcm != ILACE_FRAME) {

  83.         if (s->mb_x) {

  84.             for (i = 0; i < block_count; i++) {

  85.                 if (i > 3 ? v->mb_type[0][s->block_index[i] - s->block_wrap[i] - 1] :

  86.                             v->mb_type[0][s->block_index[i] - 2 * s->block_wrap[i] - 2]) {

  87.                     dest = s->dest[0] + ((i & 2) - 4) * 4 * s->linesize + ((i & 1) - 2) * 8;

  88.                     s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][i],

  89.                                                       i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize - 8 : dest,

  90.                                                       i > 3 ? s->uvlinesize : s->linesize);

  91.                 }

  92.             }

  93.         }

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

  95.             for (i = 0; i < block_count; i++) {

  96.                 if (i > 3 ? v->mb_type[0][s->block_index[i] - s->block_wrap[i]] :

  97.                             v->mb_type[0][s->block_index[i] - 2 * s->block_wrap[i]]) {

  98.                     dest = s->dest[0] + ((i & 2) - 4) * 4 * s->linesize + (i & 1) * 8;

  99.                     s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][i],

  100.                                                       i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize : dest,

  101.                                                       i > 3 ? s->uvlinesize : s->linesize);

  102.                 }

  103.             }

  104.         }

  105.     }

  106.     if (s->mb_y == s->end_mb_y - 1 || v->fcm == ILACE_FRAME) {

  107.         if (s->mb_x) {

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

  109.                 fieldtx = v->fieldtx_plane[s->mb_y * s->mb_stride + s->mb_x - 1];

  110.             for (i = 0; i < block_count; i++) {

  111.                 if (i > 3 ? v->mb_type[0][s->block_index[i] - 1] :

  112.                             v->mb_type[0][s->block_index[i] - 2]) {

  113.                     if (fieldtx)

  114.                         dest = s->dest[0] + ((i & 2) >> 1) * s->linesize + ((i & 1) - 2) * 8;

  115.                     else

  116.                         dest = s->dest[0] + (i & 2) * 4 * s->linesize + ((i & 1) - 2) * 8;

  117.                     s->idsp.put_signed_pixels_clamped(v->block[v->left_blk_idx][i],

  118.                                                       i > 3 ? s->dest[i - 3] - 8 : dest,

  119.                                                       i > 3 ? s->uvlinesize : s->linesize << fieldtx);

  120.                 }

  121.             }

  122.         }

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

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

  125.                 fieldtx = v->fieldtx_plane[s->mb_y * s->mb_stride + s->mb_x];

  126.             for (i = 0; i < block_count; i++) {

  127.                 if (v->mb_type[0][s->block_index[i]]) {

  128.                     if (fieldtx)

  129.                         dest = s->dest[0] + ((i & 2) >> 1) * s->linesize + (i & 1) * 8;

  130.                     else

  131.                         dest = s->dest[0] + (i & 2) * 4 * s->linesize + (i & 1) * 8;

  132.                     s->idsp.put_signed_pixels_clamped(v->block[v->cur_blk_idx][i],

  133.                                                       i > 3 ? s->dest[i - 3] : dest,

  134.                                                       i > 3 ? s->uvlinesize : s->linesize << fieldtx);

  135.                 }

  136.             }

  137.         }

  138.     }

  139. }

  140. 

  141. #define inc_blk_idx(idx) do { \

  142.         idx++; \

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

  144.             idx = 0; \

  145.     } while (0)

  146. 

  147. /***********************************************************************/

  148. /**

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

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

  151.  * @{

  152.  */

  153. 

  154. /**

  155.  * @def GET_MQUANT

  156.  * @brief Get macroblock-level quantizer scale

  157.  */

  158. #define GET_MQUANT()                                           \

  159.     if (v->dquantfrm) {                                        \

  160.         int edges = 0;                                         \

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

  162.             if (v->dqbilevel) {                                \

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

  164.             } else {                                           \

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

  166.                 if (mqdiff != 7)                               \

  167.                     mquant = -v->pq - mqdiff;                  \

  168.                 else                                           \

  169.                     mquant = -get_bits(gb, 5);                 \

  170.             }                                                  \

  171.         }                                                      \

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

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

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

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

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

  177.             edges = 15;                                        \

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

  179.             mquant = -v->altpq;                                \

  180.         if ((edges&2) && !s->mb_y)                             \

  181.             mquant = -v->altpq;                                \

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

  183.             mquant = -v->altpq;                                \

  184.         if ((edges&8) &&                                       \

  185.             s->mb_y == ((s->mb_height >> v->field_mode) - 1))  \

  186.             mquant = -v->altpq;                                \

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

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

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

  190.             mquant = 1;                                        \

  191.         }                                                      \

  192.     }

  193. 

  194. /**

  195.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  196.  * @brief Get MV differentials

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

  198.  * @param _dmv_x Horizontal differential for decoded MV

  199.  * @param _dmv_y Vertical differential for decoded MV

  200.  */

  201. #define GET_MVDATA(_dmv_x, _dmv_y)                                      \

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

  203.                          VC1_MV_DIFF_VLC_BITS, 2);                      \

  204.     if (index > 36) {                                                   \

  205.         mb_has_coeffs = 1;                                              \

  206.         index -= 37;                                                    \

  207.     } else                                                              \

  208.         mb_has_coeffs = 0;                                              \

  209.     s->mb_intra = 0;                                                    \

  210.     if (!index) {                                                       \

  211.         _dmv_x = _dmv_y = 0;                                            \

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

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

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

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

  216.         _dmv_x = 0;                                                     \

  217.         _dmv_y = 0;                                                     \

  218.         s->mb_intra = 1;                                                \

  219.     } else {                                                            \

  220.         index1 = index % 6;                                             \

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

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

  223.         if (val > 0) {                                                  \

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

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

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

  227.         }                                                               \

  228.                                                                         \

  229.         index1 = index / 6;                                             \

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

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

  232.         if (val > 0) {                                                  \

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

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

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

  236.         }                                                               \

  237.     }

  238. 

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

  240.                                                    int *dmv_y, int *pred_flag)

  241. {

  242.     int index, index1;

  243.     int extend_x, extend_y;

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

  245.     int bits, esc;

  246.     int val, sign;

  247. 

  248.     if (v->numref) {

  249.         bits = VC1_2REF_MVDATA_VLC_BITS;

  250.         esc  = 125;

  251.     } else {

  252.         bits = VC1_1REF_MVDATA_VLC_BITS;

  253.         esc  = 71;

  254.     }

  255.     extend_x = v->dmvrange & 1;

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

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

  258.     if (index == esc) {

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

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

  261.         if (v->numref) {

  262.             if (pred_flag)

  263.                 *pred_flag = *dmv_y & 1;

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

  265.         }

  266.     }

  267.     else {

  268.         av_assert0(index < esc);

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

  270.         if (index1 != 0) {

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

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

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

  274.         } else

  275.             *dmv_x = 0;

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

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

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

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

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

  281.         } else

  282.             *dmv_y = 0;

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

  284.             *pred_flag = index1 & 1;

  285.     }

  286. }

  287. 

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

  289.  */

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

  291.                             int direct, int mode)

  292. {

  293.     if (direct) {

  294.         ff_vc1_mc_1mv(v, 0);

  295.         ff_vc1_interp_mc(v);

  296.         return;

  297.     }

  298.     if (mode == BMV_TYPE_INTERPOLATED) {

  299.         ff_vc1_mc_1mv(v, 0);

  300.         ff_vc1_interp_mc(v);

  301.         return;

  302.     }

  303. 

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

  305. }

  306. 

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

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

  309.  * @param s MpegEncContext

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

  311.  * @param pq integer part of picture quantizer

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

  313.  * @param dc_val_ptr Pointer to DC predictor

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

  315.  */

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

  317.                                 int16_t **dc_val_ptr, int *dir_ptr)

  318. {

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

  320.     int16_t *dc_val;

  321.     static const uint16_t dcpred[32] = {

  322.         -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  323.              114,  102,   93,   85,   79,   73,   68,   64,

  324.               60,   57,   54,   51,   49,   47,   45,   43,

  325.               41,   39,   38,   37,   35,   34,   33

  326.     };

  327. 

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

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

  330.     else       scale = s->c_dc_scale;

  331. 

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

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

  334. 

  335.     /* B A

  336.      * C X

  337.      */

  338.     c = dc_val[ - 1];

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

  340.     a = dc_val[ - wrap];

  341. 

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

  343.         /* Set outer values */

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

  345.             b = a = dcpred[scale];

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

  347.             b = c = dcpred[scale];

  348.     } else {

  349.         /* Set outer values */

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

  351.             b = a = 0;

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

  353.             b = c = 0;

  354.     }

  355. 

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

  357.         pred     = c;

  358.         *dir_ptr = 1; // left

  359.     } else {

  360.         pred     = a;

  361.         *dir_ptr = 0; // top

  362.     }

  363. 

  364.     /* update predictor */

  365.     *dc_val_ptr = &dc_val[0];

  366.     return pred;

  367. }

  368. 

  369. 

  370. /** Get predicted DC value

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

  372.  * @param s MpegEncContext

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

  374.  * @param pq integer part of picture quantizer

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

  376.  * @param a_avail flag indicating top block availability

  377.  * @param c_avail flag indicating left block availability

  378.  * @param dc_val_ptr Pointer to DC predictor

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

  380.  */

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

  382.                               int a_avail, int c_avail,

  383.                               int16_t **dc_val_ptr, int *dir_ptr)

  384. {

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

  386.     int16_t *dc_val;

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

  388.     int q1, q2 = 0;

  389.     int dqscale_index;

  390. 

  391.     /* scale predictors if needed */

  392.     q1 = FFABS(s->current_picture.qscale_table[mb_pos]);

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

  394.     if (dqscale_index < 0)

  395.         return 0;

  396. 

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

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

  399. 

  400.     /* B A

  401.      * C X

  402.      */

  403.     c = dc_val[ - 1];

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

  405.     a = dc_val[ - wrap];

  406. 

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

  408.         q2 = FFABS(s->current_picture.qscale_table[mb_pos - 1]);

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

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

  411.     }

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

  413.         q2 = FFABS(s->current_picture.qscale_table[mb_pos - s->mb_stride]);

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

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

  416.     }

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

  418.         int off = mb_pos;

  419.         if (n != 1)

  420.             off--;

  421.         if (n != 2)

  422.             off -= s->mb_stride;

  423.         q2 = FFABS(s->current_picture.qscale_table[off]);

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

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

  426.     }

  427. 

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

  429.         pred     = c;

  430.         *dir_ptr = 1; // left

  431.     } else if (a_avail) {

  432.         pred     = a;

  433.         *dir_ptr = 0; // top

  434.     } else {

  435.         pred     = 0;

  436.         *dir_ptr = 1; // left

  437.     }

  438. 

  439.     /* update predictor */

  440.     *dc_val_ptr = &dc_val[0];

  441.     return pred;

  442. }

  443. 

  444. /** @} */ // Block group

  445. 

  446. /**

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

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

  449.  * @{

  450.  */

  451. 

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

  453.                                        uint8_t **coded_block_ptr)

  454. {

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

  456. 

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

  458.     wrap = s->b8_stride;

  459. 

  460.     /* B C

  461.      * A X

  462.      */

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

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

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

  466. 

  467.     if (b == c) {

  468.         pred = a;

  469.     } else {

  470.         pred = c;

  471.     }

  472. 

  473.     /* store value */

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

  475. 

  476.     return pred;

  477. }

  478. 

  479. /**

  480.  * Decode one AC coefficient

  481.  * @param v The VC1 context

  482.  * @param last Last coefficient

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

  484.  * @param value Decoded AC coefficient value

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

  486.  * @see 8.1.3.4

  487.  */

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

  489.                                 int *value, int codingset)

  490. {

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

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

  493. 

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

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

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

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

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

  499.         sign  = get_bits1(gb);

  500.     } else {

  501.         int escape = decode210(gb);

  502.         if (escape != 2) {

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

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

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

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

  507.             if (escape == 0) {

  508.                 if (lst)

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

  510.                 else

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

  512.             } else {

  513.                 if (lst)

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

  515.                 else

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

  517.             }

  518.             sign = get_bits1(gb);

  519.         } else {

  520.             lst = get_bits1(gb);

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

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

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

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

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

  526.                 } else { // table 60

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

  528.                 }

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

  530.             }

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

  532.             sign  = get_bits1(gb);

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

  534.         }

  535.     }

  536. 

  537.     *last  = lst;

  538.     *skip  = run;

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

  540. }

  541. 

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

  543.  * @param v VC1Context

  544.  * @param block block to decode

  545.  * @param[in] n subblock index

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

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

  548.  */

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

  550.                               int coded, int codingset)

  551. {

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

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

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

  555.     int i;

  556.     int16_t *dc_val;

  557.     int16_t *ac_val, *ac_val2;

  558.     int dcdiff, scale;

  559. 

  560.     /* Get DC differential */

  561.     if (n < 4) {

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

  563.     } else {

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

  565.     }

  566.     if (dcdiff < 0) {

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

  568.         return -1;

  569.     }

  570.     if (dcdiff) {

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

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

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

  574.         } else {

  575.             if (m)

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

  577.         }

  578.         if (get_bits1(gb))

  579.             dcdiff = -dcdiff;

  580.     }

  581. 

  582.     /* Prediction */

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

  584.     *dc_val = dcdiff;

  585. 

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

  587.     if (n < 4)

  588.         scale = s->y_dc_scale;

  589.     else

  590.         scale = s->c_dc_scale;

  591.     block[0] = dcdiff * scale;

  592. 

  593.     ac_val  = s->ac_val[0][s->block_index[n]];

  594.     ac_val2 = ac_val;

  595.     if (dc_pred_dir) // left

  596.         ac_val -= 16;

  597.     else // top

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

  599. 

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

  601. 

  602.     //AC Decoding

  603.     i = !!coded;

  604. 

  605.     if (coded) {

  606.         int last = 0, skip, value;

  607.         const uint8_t *zz_table;

  608.         int k;

  609. 

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

  611.             if (!dc_pred_dir)

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

  613.             else

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

  615.         } else

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

  617. 

  618.         while (!last) {

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

  620.             i += skip;

  621.             if (i > 63)

  622.                 break;

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

  624.         }

  625. 

  626.         /* apply AC prediction if needed */

  627.         if (s->ac_pred) {

  628.             int sh;

  629.             if (dc_pred_dir) { // left

  630.                 sh = v->left_blk_sh;

  631.             } else { // top

  632.                 sh = v->top_blk_sh;

  633.                 ac_val += 8;

  634.             }

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

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

  637.         }

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

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

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

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

  642.         }

  643. 

  644.         /* scale AC coeffs */

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

  646.             if (block[k]) {

  647.                 block[k] *= scale;

  648.                 if (!v->pquantizer)

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

  650.             }

  651. 

  652.     } else {

  653.         int k;

  654. 

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

  656. 

  657.         /* apply AC prediction if needed */

  658.         if (s->ac_pred) {

  659.             int sh;

  660.             if (dc_pred_dir) { //left

  661.                 sh = v->left_blk_sh;

  662.             } else { // top

  663.                 sh = v->top_blk_sh;

  664.                 ac_val  += 8;

  665.                 ac_val2 += 8;

  666.             }

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

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

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

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

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

  672.             }

  673.         }

  674.     }

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

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

  677. 

  678.     return 0;

  679. }

  680. 

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

  682.  * @param v VC1Context

  683.  * @param block block to decode

  684.  * @param[in] n subblock number

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

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

  687.  * @param mquant quantizer value for this macroblock

  688.  */

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

  690.                                   int coded, int codingset, int mquant)

  691. {

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

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

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

  695.     int i;

  696.     int16_t *dc_val = NULL;

  697.     int16_t *ac_val, *ac_val2;

  698.     int dcdiff;

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

  700.     int use_pred = s->ac_pred;

  701.     int scale;

  702.     int q1, q2 = 0;

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

  704.     int quant = FFABS(mquant);

  705. 

  706.     /* Get DC differential */

  707.     if (n < 4) {

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

  709.     } else {

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

  711.     }

  712.     if (dcdiff < 0) {

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

  714.         return -1;

  715.     }

  716.     if (dcdiff) {

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

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

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

  720.         } else {

  721.             if (m)

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

  723.         }

  724.         if (get_bits1(gb))

  725.             dcdiff = -dcdiff;

  726.     }

  727. 

  728.     /* Prediction */

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

  730.     *dc_val = dcdiff;

  731. 

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

  733.     if (n < 4)

  734.         scale = s->y_dc_scale;

  735.     else

  736.         scale = s->c_dc_scale;

  737.     block[0] = dcdiff * scale;

  738. 

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

  740.     if (!a_avail && !c_avail)

  741.         use_pred = 0;

  742. 

  743.     scale = quant * 2 + ((mquant < 0) ? 0 : v->halfpq);

  744. 

  745.     ac_val  = s->ac_val[0][s->block_index[n]];

  746.     ac_val2 = ac_val;

  747.     if (dc_pred_dir) // left

  748.         ac_val -= 16;

  749.     else // top

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

  751. 

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

  753.     if (n == 3)

  754.         q2 = q1;

  755.     else if (dc_pred_dir) {

  756.         if (n == 1)

  757.             q2 = q1;

  758.         else if (c_avail && mb_pos)

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

  760.     } else {

  761.         if (n == 2)

  762.             q2 = q1;

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

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

  765.     }

  766. 

  767.     //AC Decoding

  768.     i = 1;

  769. 

  770.     if (coded) {

  771.         int last = 0, skip, value;

  772.         const uint8_t *zz_table;

  773.         int k;

  774. 

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

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

  777.                 zz_table = v->zzi_8x8;

  778.             } else {

  779.                 if (!dc_pred_dir) // top

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

  781.                 else // left

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

  783.             }

  784.         } else {

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

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

  787.             else

  788.                 zz_table = v->zzi_8x8;

  789.         }

  790. 

  791.         while (!last) {

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

  793.             i += skip;

  794.             if (i > 63)

  795.                 break;

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

  797.         }

  798. 

  799.         /* apply AC prediction if needed */

  800.         if (use_pred) {

  801.             int sh;

  802.             if (dc_pred_dir) { // left

  803.                 sh = v->left_blk_sh;

  804.             } else { // top

  805.                 sh = v->top_blk_sh;

  806.                 ac_val += 8;

  807.             }

  808.             /* scale predictors if needed*/

  809.             q1 = FFABS(q1) * 2 + ((q1 < 0) ? 0 : v->halfpq) - 1;

  810.             if (q1 < 1)

  811.                 return AVERROR_INVALIDDATA;

  812.             if (q2)

  813.                 q2 = FFABS(q2) * 2 + ((q2 < 0) ? 0 : v->halfpq) - 1;

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

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

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

  817.             } else {

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

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

  820.             }

  821.         }

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

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

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

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

  826.         }

  827. 

  828.         /* scale AC coeffs */

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

  830.             if (block[k]) {

  831.                 block[k] *= scale;

  832.                 if (!v->pquantizer)

  833.                     block[k] += (block[k] < 0) ? -quant : quant;

  834.             }

  835. 

  836.     } else { // no AC coeffs

  837.         int k;

  838. 

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

  840. 

  841.         /* apply AC prediction if needed */

  842.         if (use_pred) {

  843.             int sh;

  844.             if (dc_pred_dir) { // left

  845.                 sh = v->left_blk_sh;

  846.             } else { // top

  847.                 sh = v->top_blk_sh;

  848.                 ac_val  += 8;

  849.                 ac_val2 += 8;

  850.             }

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

  852.             q1 = FFABS(q1) * 2 + ((q1 < 0) ? 0 : v->halfpq) - 1;

  853.             if (q1 < 1)

  854.                 return AVERROR_INVALIDDATA;

  855.             if (q2)

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

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

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

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

  860.             }

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

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

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

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

  865.             }

  866.         }

  867.     }

  868.     if (use_pred) i = 63;

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

  870. 

  871.     return 0;

  872. }

  873. 

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

  875.  * @param v VC1Context

  876.  * @param block block to decode

  877.  * @param[in] n subblock index

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

  879.  * @param mquant block quantizer

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

  881.  */

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

  883.                                   int coded, int mquant, int codingset)

  884. {

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

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

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

  888.     int i;

  889.     int16_t *dc_val = NULL;

  890.     int16_t *ac_val, *ac_val2;

  891.     int dcdiff;

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

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

  894.     int use_pred = s->ac_pred;

  895.     int scale;

  896.     int q1, q2 = 0;

  897.     int quant = FFABS(mquant);

  898. 

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

  900. 

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

  902.     quant = av_clip_uintp2(quant, 5);

  903. 

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

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

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

  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 = (quant == 1 || quant == 2) ? 3 - quant : 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, quant, 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][s->block_index[n]];

  950.     ac_val2 = ac_val;

  951. 

  952.     scale = quant * 2 + ((mquant < 0) ? 0 : 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.             q1 = FFABS(q1) * 2 + ((q1 < 0) ? 0 : v->halfpq) - 1;

  997.             if (q1 < 1)

  998.                 return AVERROR_INVALIDDATA;

  999.             if (q2)

  1000.                 q2 = FFABS(q2) * 2 + ((q2 < 0) ? 0 : v->halfpq) - 1;

  1001.             if (q2 && q1 != q2) {

  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) ? -quant : quant;

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

  1042.                 if (q1 < 1)

  1043.                     return AVERROR_INVALIDDATA;

  1044.                 if (q2)

  1045.                     q2 = FFABS(q2) * 2 + ((q2 < 0) ? 0 : v->halfpq) - 1;

  1046.                 if (q2 && q1 != q2) {

  1047.                     for (k = 1; k < 8; k++)

  1048.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1049.                 }

  1050.             }

  1051.         } else { // top

  1052.             if (use_pred) {

  1053.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

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

  1055.                 if (q1 < 1)

  1056.                     return AVERROR_INVALIDDATA;

  1057.                 if (q2)

  1058.                     q2 = FFABS(q2) * 2 + ((q2 < 0) ? 0 : v->halfpq) - 1;

  1059.                 if (q2 && q1 != q2) {

  1060.                     for (k = 1; k < 8; k++)

  1061.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1062.                 }

  1063.             }

  1064.         }

  1065. 

  1066.         /* apply AC prediction if needed */

  1067.         if (use_pred) {

  1068.             if (dc_pred_dir) { // left

  1069.                 for (k = 1; k < 8; k++) {

  1070.                     block[k << v->left_blk_sh] = ac_val2[k] * scale;

  1071.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  1072.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -quant : quant;

  1073.                 }

  1074.             } else { // top

  1075.                 for (k = 1; k < 8; k++) {

  1076.                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;

  1077.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  1078.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -quant : quant;

  1079.                 }

  1080.             }

  1081.             i = 63;

  1082.         }

  1083.     }

  1084.     s->block_last_index[n] = i;

  1085. 

  1086.     return 0;

  1087. }

  1088. 

  1089. /** Decode P block

  1090.  */

  1091. static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,

  1092.                               int mquant, int ttmb, int first_block,

  1093.                               uint8_t *dst, int linesize, int skip_block,

  1094.                               int *ttmb_out)

  1095. {

  1096.     MpegEncContext *s = &v->s;

  1097.     GetBitContext *gb = &s->gb;

  1098.     int i, j;

  1099.     int subblkpat = 0;

  1100.     int scale, off, idx, last, skip, value;

  1101.     int ttblk = ttmb & 7;

  1102.     int pat = 0;

  1103.     int quant = FFABS(mquant);

  1104. 

  1105.     s->bdsp.clear_block(block);

  1106. 

  1107.     if (ttmb == -1) {

  1108.         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)];

  1109.     }

  1110.     if (ttblk == TT_4X4) {

  1111.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  1112.     }

  1113.     if ((ttblk != TT_8X8 && ttblk != TT_4X4)

  1114.         && ((v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))

  1115.             || (!v->res_rtm_flag && !first_block))) {

  1116.         subblkpat = decode012(gb);

  1117.         if (subblkpat)

  1118.             subblkpat ^= 3; // swap decoded pattern bits

  1119.         if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM)

  1120.             ttblk = TT_8X4;

  1121.         if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT)

  1122.             ttblk = TT_4X8;

  1123.     }

  1124.     scale = quant * 2 + ((mquant < 0) ? 0 : v->halfpq);

  1125. 

  1126.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

  1127.     if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM) {

  1128.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  1129.         ttblk     = TT_8X4;

  1130.     }

  1131.     if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  1132.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  1133.         ttblk     = TT_4X8;

  1134.     }

  1135.     switch (ttblk) {

  1136.     case TT_8X8:

  1137.         pat  = 0xF;

  1138.         i    = 0;

  1139.         last = 0;

  1140.         while (!last) {

  1141.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  1142.             i += skip;

  1143.             if (i > 63)

  1144.                 break;

  1145.             if (!v->fcm)

  1146.                 idx = v->zz_8x8[0][i++];

  1147.             else

  1148.                 idx = v->zzi_8x8[i++];

  1149.             block[idx] = value * scale;

  1150.             if (!v->pquantizer)

  1151.                 block[idx] += (block[idx] < 0) ? -quant : quant;

  1152.         }

  1153.         if (!skip_block) {

  1154.             if (i == 1)

  1155.                 v->vc1dsp.vc1_inv_trans_8x8_dc(dst, linesize, block);

  1156.             else {

  1157.                 v->vc1dsp.vc1_inv_trans_8x8(block);

  1158.                 s->idsp.add_pixels_clamped(block, dst, linesize);

  1159.             }

  1160.         }

  1161.         break;

  1162.     case TT_4X4:

  1163.         pat = ~subblkpat & 0xF;

  1164.         for (j = 0; j < 4; j++) {

  1165.             last = subblkpat & (1 << (3 - j));

  1166.             i    = 0;

  1167.             off  = (j & 1) * 4 + (j & 2) * 16;

  1168.             while (!last) {

  1169.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  1170.                 i += skip;

  1171.                 if (i > 15)

  1172.                     break;

  1173.                 if (!v->fcm)

  1174.                     idx = ff_vc1_simple_progressive_4x4_zz[i++];

  1175.                 else

  1176.                     idx = ff_vc1_adv_interlaced_4x4_zz[i++];

  1177.                 block[idx + off] = value * scale;

  1178.                 if (!v->pquantizer)

  1179.                     block[idx + off] += (block[idx + off] < 0) ? -quant : quant;

  1180.             }

  1181.             if (!(subblkpat & (1 << (3 - j))) && !skip_block) {

  1182.                 if (i == 1)

  1183.                     v->vc1dsp.vc1_inv_trans_4x4_dc(dst + (j & 1) * 4 + (j & 2) * 2 * linesize, linesize, block + off);

  1184.                 else

  1185.                     v->vc1dsp.vc1_inv_trans_4x4(dst + (j & 1) * 4 + (j & 2) *  2 * linesize, linesize, block + off);

  1186.             }

  1187.         }

  1188.         break;

  1189.     case TT_8X4:

  1190.         pat = ~((subblkpat & 2) * 6 + (subblkpat & 1) * 3) & 0xF;

  1191.         for (j = 0; j < 2; j++) {

  1192.             last = subblkpat & (1 << (1 - j));

  1193.             i    = 0;

  1194.             off  = j * 32;

  1195.             while (!last) {

  1196.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  1197.                 i += skip;

  1198.                 if (i > 31)

  1199.                     break;

  1200.                 if (!v->fcm)

  1201.                     idx = v->zz_8x4[i++] + off;

  1202.                 else

  1203.                     idx = ff_vc1_adv_interlaced_8x4_zz[i++] + off;

  1204.                 block[idx] = value * scale;

  1205.                 if (!v->pquantizer)

  1206.                     block[idx] += (block[idx] < 0) ? -quant : quant;

  1207.             }

  1208.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  1209.                 if (i == 1)

  1210.                     v->vc1dsp.vc1_inv_trans_8x4_dc(dst + j * 4 * linesize, linesize, block + off);

  1211.                 else

  1212.                     v->vc1dsp.vc1_inv_trans_8x4(dst + j * 4 * linesize, linesize, block + off);

  1213.             }

  1214.         }

  1215.         break;

  1216.     case TT_4X8:

  1217.         pat = ~(subblkpat * 5) & 0xF;

  1218.         for (j = 0; j < 2; j++) {

  1219.             last = subblkpat & (1 << (1 - j));

  1220.             i    = 0;

  1221.             off  = j * 4;

  1222.             while (!last) {

  1223.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  1224.                 i += skip;

  1225.                 if (i > 31)

  1226.                     break;

  1227.                 if (!v->fcm)

  1228.                     idx = v->zz_4x8[i++] + off;

  1229.                 else

  1230.                     idx = ff_vc1_adv_interlaced_4x8_zz[i++] + off;

  1231.                 block[idx] = value * scale;

  1232.                 if (!v->pquantizer)

  1233.                     block[idx] += (block[idx] < 0) ? -quant : quant;

  1234.             }

  1235.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  1236.                 if (i == 1)

  1237.                     v->vc1dsp.vc1_inv_trans_4x8_dc(dst + j * 4, linesize, block + off);

  1238.                 else

  1239.                     v->vc1dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);

  1240.             }

  1241.         }

  1242.         break;

  1243.     }

  1244.     if (ttmb_out)

  1245.         *ttmb_out |= ttblk << (n * 4);

  1246.     return pat;

  1247. }

  1248. 

  1249. /** @} */ // Macroblock group

  1250. 

  1251. static const uint8_t size_table[6] = { 0, 2, 3, 4,  5,  8 };

  1252. 

  1253. /** Decode one P-frame MB

  1254.  */

  1255. static int vc1_decode_p_mb(VC1Context *v)

  1256. {

  1257.     MpegEncContext *s = &v->s;

  1258.     GetBitContext *gb = &s->gb;

  1259.     int i, j;

  1260.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1261.     int cbp; /* cbp decoding stuff */

  1262.     int mqdiff, mquant; /* MB quantization */

  1263.     int ttmb = v->ttfrm; /* MB Transform type */

  1264. 

  1265.     int mb_has_coeffs = 1; /* last_flag */

  1266.     int dmv_x, dmv_y; /* Differential MV components */

  1267.     int index, index1; /* LUT indexes */

  1268.     int val, sign; /* temp values */

  1269.     int first_block = 1;

  1270.     int dst_idx, off;

  1271.     int skipped, fourmv;

  1272.     int block_cbp = 0, pat, block_tt = 0, block_intra = 0;

  1273. 

  1274.     mquant = v->pq; /* lossy initialization */

  1275. 

  1276.     if (v->mv_type_is_raw)

  1277.         fourmv = get_bits1(gb);

  1278.     else

  1279.         fourmv = v->mv_type_mb_plane[mb_pos];

  1280.     if (v->skip_is_raw)

  1281.         skipped = get_bits1(gb);

  1282.     else

  1283.         skipped = v->s.mbskip_table[mb_pos];

  1284. 

  1285.     if (!fourmv) { /* 1MV mode */

  1286.         if (!skipped) {

  1287.             GET_MVDATA(dmv_x, dmv_y);

  1288. 

  1289.             if (s->mb_intra) {

  1290.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  1291.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  1292.             }

  1293.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  1294.             ff_vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  1295. 

  1296.             /* FIXME Set DC val for inter block ? */

  1297.             if (s->mb_intra && !mb_has_coeffs) {

  1298.                 GET_MQUANT();

  1299.                 s->ac_pred = get_bits1(gb);

  1300.                 cbp        = 0;

  1301.             } else if (mb_has_coeffs) {

  1302.                 if (s->mb_intra)

  1303.                     s->ac_pred = get_bits1(gb);

  1304.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1305.                 GET_MQUANT();

  1306.             } else {

  1307.                 mquant = v->pq;

  1308.                 cbp    = 0;

  1309.             }

  1310.             s->current_picture.qscale_table[mb_pos] = mquant;

  1311. 

  1312.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  1313.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  1314.                                 VC1_TTMB_VLC_BITS, 2);

  1315.             if (!s->mb_intra) ff_vc1_mc_1mv(v, 0);

  1316.             dst_idx = 0;

  1317.             for (i = 0; i < 6; i++) {

  1318.                 s->dc_val[0][s->block_index[i]] = 0;

  1319.                 dst_idx += i >> 2;

  1320.                 val = ((cbp >> (5 - i)) & 1);

  1321.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1322.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  1323.                 if (s->mb_intra) {

  1324.                     /* check if prediction blocks A and C are available */

  1325.                     v->a_avail = v->c_avail = 0;

  1326.                     if (i == 2 || i == 3 || !s->first_slice_line)

  1327.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1328.                     if (i == 1 || i == 3 || s->mb_x)

  1329.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1330. 

  1331.                     vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,

  1332.                                            (i & 4) ? v->codingset2 : v->codingset);

  1333.                     if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  1334.                         continue;

  1335.                     v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);

  1336.                     if (v->rangeredfrm)

  1337.                         for (j = 0; j < 64; j++)

  1338.                             v->block[v->cur_blk_idx][i][j] <<= 1;

  1339.                     block_cbp   |= 0xF << (i << 2);

  1340.                     block_intra |= 1 << i;

  1341.                 } else if (val) {

  1342.                     pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb, first_block,

  1343.                                              s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize,

  1344.                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);

  1345.                     block_cbp |= pat << (i << 2);

  1346.                     if (!v->ttmbf && ttmb < 8)

  1347.                         ttmb = -1;

  1348.                     first_block = 0;

  1349.                 }

  1350.             }

  1351.         } else { // skipped

  1352.             s->mb_intra = 0;

  1353.             for (i = 0; i < 6; i++) {

  1354.                 v->mb_type[0][s->block_index[i]] = 0;

  1355.                 s->dc_val[0][s->block_index[i]]  = 0;

  1356.             }

  1357.             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  1358.             s->current_picture.qscale_table[mb_pos] = 0;

  1359.             ff_vc1_pred_mv(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  1360.             ff_vc1_mc_1mv(v, 0);

  1361.         }

  1362.     } else { // 4MV mode

  1363.         if (!skipped /* unskipped MB */) {

  1364.             int intra_count = 0, coded_inter = 0;

  1365.             int is_intra[6], is_coded[6];

  1366.             /* Get CBPCY */

  1367.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1368.             for (i = 0; i < 6; i++) {

  1369.                 val = ((cbp >> (5 - i)) & 1);

  1370.                 s->dc_val[0][s->block_index[i]] = 0;

  1371.                 s->mb_intra                     = 0;

  1372.                 if (i < 4) {

  1373.                     dmv_x = dmv_y = 0;

  1374.                     s->mb_intra   = 0;

  1375.                     mb_has_coeffs = 0;

  1376.                     if (val) {

  1377.                         GET_MVDATA(dmv_x, dmv_y);

  1378.                     }

  1379.                     ff_vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  1380.                     if (!s->mb_intra)

  1381.                         ff_vc1_mc_4mv_luma(v, i, 0, 0);

  1382.                     intra_count += s->mb_intra;

  1383.                     is_intra[i]  = s->mb_intra;

  1384.                     is_coded[i]  = mb_has_coeffs;

  1385.                 }

  1386.                 if (i & 4) {

  1387.                     is_intra[i] = (intra_count >= 3);

  1388.                     is_coded[i] = val;

  1389.                 }

  1390.                 if (i == 4)

  1391.                     ff_vc1_mc_4mv_chroma(v, 0);

  1392.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  1393.                 if (!coded_inter)

  1394.                     coded_inter = !is_intra[i] & is_coded[i];

  1395.             }

  1396.             // if there are no coded blocks then don't do anything more

  1397.             dst_idx = 0;

  1398.             if (!intra_count && !coded_inter)

  1399.                 goto end;

  1400.             GET_MQUANT();

  1401.             s->current_picture.qscale_table[mb_pos] = mquant;

  1402.             /* test if block is intra and has pred */

  1403.             {

  1404.                 int intrapred = 0;

  1405.                 for (i = 0; i < 6; i++)

  1406.                     if (is_intra[i]) {

  1407.                         if (((!s->first_slice_line || (i == 2 || i == 3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  1408.                             || ((s->mb_x || (i == 1 || i == 3)) && v->mb_type[0][s->block_index[i] - 1])) {

  1409.                             intrapred = 1;

  1410.                             break;

  1411.                         }

  1412.                     }

  1413.                 if (intrapred)

  1414.                     s->ac_pred = get_bits1(gb);

  1415.                 else

  1416.                     s->ac_pred = 0;

  1417.             }

  1418.             if (!v->ttmbf && coded_inter)

  1419.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1420.             for (i = 0; i < 6; i++) {

  1421.                 dst_idx    += i >> 2;

  1422.                 off         = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1423.                 s->mb_intra = is_intra[i];

  1424.                 if (is_intra[i]) {

  1425.                     /* check if prediction blocks A and C are available */

  1426.                     v->a_avail = v->c_avail = 0;

  1427.                     if (i == 2 || i == 3 || !s->first_slice_line)

  1428.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1429.                     if (i == 1 || i == 3 || s->mb_x)

  1430.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1431. 

  1432.                     vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, is_coded[i], mquant,

  1433.                                            (i & 4) ? v->codingset2 : v->codingset);

  1434.                     if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  1435.                         continue;

  1436.                     v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);

  1437.                     if (v->rangeredfrm)

  1438.                         for (j = 0; j < 64; j++)

  1439.                             v->block[v->cur_blk_idx][i][j] <<= 1;

  1440.                     block_cbp   |= 0xF << (i << 2);

  1441.                     block_intra |= 1 << i;

  1442.                 } else if (is_coded[i]) {

  1443.                     pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,

  1444.                                              first_block, s->dest[dst_idx] + off,

  1445.                                              (i & 4) ? s->uvlinesize : s->linesize,

  1446.                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY),

  1447.                                              &block_tt);

  1448.                     block_cbp |= pat << (i << 2);

  1449.                     if (!v->ttmbf && ttmb < 8)

  1450.                         ttmb = -1;

  1451.                     first_block = 0;

  1452.                 }

  1453.             }

  1454.         } else { // skipped MB

  1455.             s->mb_intra                               = 0;

  1456.             s->current_picture.qscale_table[mb_pos] = 0;

  1457.             for (i = 0; i < 6; i++) {

  1458.                 v->mb_type[0][s->block_index[i]] = 0;

  1459.                 s->dc_val[0][s->block_index[i]]  = 0;

  1460.             }

  1461.             for (i = 0; i < 4; i++) {

  1462.                 ff_vc1_pred_mv(v, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  1463.                 ff_vc1_mc_4mv_luma(v, i, 0, 0);

  1464.             }

  1465.             ff_vc1_mc_4mv_chroma(v, 0);

  1466.             s->current_picture.qscale_table[mb_pos] = 0;

  1467.         }

  1468.     }

  1469. end:

  1470.     if (v->overlap && v->pq >= 9)

  1471.         ff_vc1_p_overlap_filter(v);

  1472.     vc1_put_signed_blocks_clamped(v);

  1473. 

  1474.     v->cbp[s->mb_x]      = block_cbp;

  1475.     v->ttblk[s->mb_x]    = block_tt;

  1476.     v->is_intra[s->mb_x] = block_intra;

  1477. 

  1478.     return 0;

  1479. }

  1480. 

  1481. /* Decode one macroblock in an interlaced frame p picture */

  1482. 

  1483. static int vc1_decode_p_mb_intfr(VC1Context *v)

  1484. {

  1485.     MpegEncContext *s = &v->s;

  1486.     GetBitContext *gb = &s->gb;

  1487.     int i;

  1488.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1489.     int cbp = 0; /* cbp decoding stuff */

  1490.     int mqdiff, mquant; /* MB quantization */

  1491.     int ttmb = v->ttfrm; /* MB Transform type */

  1492. 

  1493.     int mb_has_coeffs = 1; /* last_flag */

  1494.     int dmv_x, dmv_y; /* Differential MV components */

  1495.     int val; /* temp value */

  1496.     int first_block = 1;

  1497.     int dst_idx, off;

  1498.     int skipped, fourmv = 0, twomv = 0;

  1499.     int block_cbp = 0, pat, block_tt = 0;

  1500.     int idx_mbmode = 0, mvbp;

  1501.     int fieldtx;

  1502. 

  1503.     mquant = v->pq; /* Lossy initialization */

  1504. 

  1505.     if (v->skip_is_raw)

  1506.         skipped = get_bits1(gb);

  1507.     else

  1508.         skipped = v->s.mbskip_table[mb_pos];

  1509.     if (!skipped) {

  1510.         if (v->fourmvswitch)

  1511.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_4MV_MBMODE_VLC_BITS, 2); // try getting this done

  1512.         else

  1513.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2); // in a single line

  1514.         switch (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0]) {

  1515.         /* store the motion vector type in a flag (useful later) */

  1516.         case MV_PMODE_INTFR_4MV:

  1517.             fourmv = 1;

  1518.             v->blk_mv_type[s->block_index[0]] = 0;

  1519.             v->blk_mv_type[s->block_index[1]] = 0;

  1520.             v->blk_mv_type[s->block_index[2]] = 0;

  1521.             v->blk_mv_type[s->block_index[3]] = 0;

  1522.             break;

  1523.         case MV_PMODE_INTFR_4MV_FIELD:

  1524.             fourmv = 1;

  1525.             v->blk_mv_type[s->block_index[0]] = 1;

  1526.             v->blk_mv_type[s->block_index[1]] = 1;

  1527.             v->blk_mv_type[s->block_index[2]] = 1;

  1528.             v->blk_mv_type[s->block_index[3]] = 1;

  1529.             break;

  1530.         case MV_PMODE_INTFR_2MV_FIELD:

  1531.             twomv = 1;

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

  1533.             v->blk_mv_type[s->block_index[1]] = 1;

  1534.             v->blk_mv_type[s->block_index[2]] = 1;

  1535.             v->blk_mv_type[s->block_index[3]] = 1;

  1536.             break;

  1537.         case MV_PMODE_INTFR_1MV:

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

  1539.             v->blk_mv_type[s->block_index[1]] = 0;

  1540.             v->blk_mv_type[s->block_index[2]] = 0;

  1541.             v->blk_mv_type[s->block_index[3]] = 0;

  1542.             break;

  1543.         }

  1544.         if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB

  1545.             for (i = 0; i < 4; i++) {

  1546.                 s->current_picture.motion_val[1][s->block_index[i]][0] = 0;

  1547.                 s->current_picture.motion_val[1][s->block_index[i]][1] = 0;

  1548.             }

  1549.             v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.

  1550.             s->mb_intra          = 1;

  1551.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  1552.             fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);

  1553.             mb_has_coeffs = get_bits1(gb);

  1554.             if (mb_has_coeffs)

  1555.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1556.             v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);

  1557.             GET_MQUANT();

  1558.             s->current_picture.qscale_table[mb_pos] = mquant;

  1559.             /* Set DC scale - y and c use the same (not sure if necessary here) */

  1560.             s->y_dc_scale = s->y_dc_scale_table[FFABS(mquant)];

  1561.             s->c_dc_scale = s->c_dc_scale_table[FFABS(mquant)];

  1562.             dst_idx = 0;

  1563.             for (i = 0; i < 6; i++) {

  1564.                 v->a_avail = v->c_avail          = 0;

  1565.                 v->mb_type[0][s->block_index[i]] = 1;

  1566.                 s->dc_val[0][s->block_index[i]]  = 0;

  1567.                 dst_idx += i >> 2;

  1568.                 val = ((cbp >> (5 - i)) & 1);

  1569.                 if (i == 2 || i == 3 || !s->first_slice_line)

  1570.                     v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1571.                 if (i == 1 || i == 3 || s->mb_x)

  1572.                     v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1573. 

  1574.                 vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,

  1575.                                        (i & 4) ? v->codingset2 : v->codingset);

  1576.                 if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  1577.                     continue;

  1578.                 v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);

  1579.                 if (i < 4)

  1580.                     off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;

  1581.                 else

  1582.                     off = 0;

  1583.                 block_cbp |= 0xf << (i << 2);

  1584.             }

  1585. 

  1586.         } else { // inter MB

  1587.             mb_has_coeffs = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][3];

  1588.             if (mb_has_coeffs)

  1589.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1590.             if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {

  1591.                 v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);

  1592.             } else {

  1593.                 if ((ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV)

  1594.                     || (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV_FIELD)) {

  1595.                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  1596.                 }

  1597.             }

  1598.             s->mb_intra = v->is_intra[s->mb_x] = 0;

  1599.             for (i = 0; i < 6; i++)

  1600.                 v->mb_type[0][s->block_index[i]] = 0;

  1601.             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][1];

  1602.             /* for all motion vector read MVDATA and motion compensate each block */

  1603.             dst_idx = 0;

  1604.             if (fourmv) {

  1605.                 mvbp = v->fourmvbp;

  1606.                 for (i = 0; i < 4; i++) {

  1607.                     dmv_x = dmv_y = 0;

  1608.                     if (mvbp & (8 >> i))

  1609.                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  1610.                     ff_vc1_pred_mv_intfr(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0);

  1611.                     ff_vc1_mc_4mv_luma(v, i, 0, 0);

  1612.                 }

  1613.                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);

  1614.             } else if (twomv) {

  1615.                 mvbp  = v->twomvbp;

  1616.                 dmv_x = dmv_y = 0;

  1617.                 if (mvbp & 2) {

  1618.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  1619.                 }

  1620.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);

  1621.                 ff_vc1_mc_4mv_luma(v, 0, 0, 0);

  1622.                 ff_vc1_mc_4mv_luma(v, 1, 0, 0);

  1623.                 dmv_x = dmv_y = 0;

  1624.                 if (mvbp & 1) {

  1625.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  1626.                 }

  1627.                 ff_vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);

  1628.                 ff_vc1_mc_4mv_luma(v, 2, 0, 0);

  1629.                 ff_vc1_mc_4mv_luma(v, 3, 0, 0);

  1630.                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);

  1631.             } else {

  1632.                 mvbp = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][2];

  1633.                 dmv_x = dmv_y = 0;

  1634.                 if (mvbp) {

  1635.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  1636.                 }

  1637.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  1638.                 ff_vc1_mc_1mv(v, 0);

  1639.             }

  1640.             if (cbp)

  1641.                 GET_MQUANT();  // p. 227

  1642.             s->current_picture.qscale_table[mb_pos] = mquant;

  1643.             if (!v->ttmbf && cbp)

  1644.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1645.             for (i = 0; i < 6; i++) {

  1646.                 s->dc_val[0][s->block_index[i]] = 0;

  1647.                 dst_idx += i >> 2;

  1648.                 val = ((cbp >> (5 - i)) & 1);

  1649.                 if (!fieldtx)

  1650.                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1651.                 else

  1652.                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));

  1653.                 if (val) {

  1654.                     pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,

  1655.                                              first_block, s->dest[dst_idx] + off,

  1656.                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),

  1657.                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);

  1658.                     block_cbp |= pat << (i << 2);

  1659.                     if (!v->ttmbf && ttmb < 8)

  1660.                         ttmb = -1;

  1661.                     first_block = 0;

  1662.                 }

  1663.             }

  1664.         }

  1665.     } else { // skipped

  1666.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  1667.         for (i = 0; i < 6; i++) {

  1668.             v->mb_type[0][s->block_index[i]] = 0;

  1669.             s->dc_val[0][s->block_index[i]] = 0;

  1670.         }

  1671.         s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  1672.         s->current_picture.qscale_table[mb_pos] = 0;

  1673.         v->blk_mv_type[s->block_index[0]] = 0;

  1674.         v->blk_mv_type[s->block_index[1]] = 0;

  1675.         v->blk_mv_type[s->block_index[2]] = 0;

  1676.         v->blk_mv_type[s->block_index[3]] = 0;

  1677.         ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  1678.         ff_vc1_mc_1mv(v, 0);

  1679.         v->fieldtx_plane[mb_pos] = 0;

  1680.     }

  1681.     if (v->overlap && v->pq >= 9)

  1682.         ff_vc1_p_overlap_filter(v);

  1683.     vc1_put_signed_blocks_clamped(v);

  1684. 

  1685.     v->cbp[s->mb_x]      = block_cbp;

  1686.     v->ttblk[s->mb_x]    = block_tt;

  1687. 

  1688.     return 0;

  1689. }

  1690. 

  1691. static int vc1_decode_p_mb_intfi(VC1Context *v)

  1692. {

  1693.     MpegEncContext *s = &v->s;

  1694.     GetBitContext *gb = &s->gb;

  1695.     int i;

  1696.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1697.     int cbp = 0; /* cbp decoding stuff */

  1698.     int mqdiff, mquant; /* MB quantization */

  1699.     int ttmb = v->ttfrm; /* MB Transform type */

  1700. 

  1701.     int mb_has_coeffs = 1; /* last_flag */

  1702.     int dmv_x, dmv_y; /* Differential MV components */

  1703.     int val; /* temp values */

  1704.     int first_block = 1;

  1705.     int dst_idx, off;

  1706.     int pred_flag = 0;

  1707.     int block_cbp = 0, pat, block_tt = 0;

  1708.     int idx_mbmode = 0;

  1709. 

  1710.     mquant = v->pq; /* Lossy initialization */

  1711. 

  1712.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  1713.     if (idx_mbmode <= 1) { // intra MB

  1714.         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.

  1715.         s->mb_intra          = 1;

  1716.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  1717.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  1718.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_INTRA;

  1719.         GET_MQUANT();

  1720.         s->current_picture.qscale_table[mb_pos] = mquant;

  1721.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  1722.         s->y_dc_scale = s->y_dc_scale_table[FFABS(mquant)];

  1723.         s->c_dc_scale = s->c_dc_scale_table[FFABS(mquant)];

  1724.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  1725.         mb_has_coeffs = idx_mbmode & 1;

  1726.         if (mb_has_coeffs)

  1727.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  1728.         dst_idx = 0;

  1729.         for (i = 0; i < 6; i++) {

  1730.             v->a_avail = v->c_avail          = 0;

  1731.             v->mb_type[0][s->block_index[i]] = 1;

  1732.             s->dc_val[0][s->block_index[i]]  = 0;

  1733.             dst_idx += i >> 2;

  1734.             val = ((cbp >> (5 - i)) & 1);

  1735.             if (i == 2 || i == 3 || !s->first_slice_line)

  1736.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1737.             if (i == 1 || i == 3 || s->mb_x)

  1738.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1739. 

  1740.             vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,

  1741.                                    (i & 4) ? v->codingset2 : v->codingset);

  1742.             if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  1743.                 continue;

  1744.             v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);

  1745.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1746.             block_cbp |= 0xf << (i << 2);

  1747.         }

  1748.     } else {

  1749.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  1750.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  1751.         for (i = 0; i < 6; i++)

  1752.             v->mb_type[0][s->block_index[i]] = 0;

  1753.         if (idx_mbmode <= 5) { // 1-MV

  1754.             dmv_x = dmv_y = pred_flag = 0;

  1755.             if (idx_mbmode & 1) {

  1756.                 get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  1757.             }

  1758.             ff_vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  1759.             ff_vc1_mc_1mv(v, 0);

  1760.             mb_has_coeffs = !(idx_mbmode & 2);

  1761.         } else { // 4-MV

  1762.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  1763.             for (i = 0; i < 4; i++) {

  1764.                 dmv_x = dmv_y = pred_flag = 0;

  1765.                 if (v->fourmvbp & (8 >> i))

  1766.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  1767.                 ff_vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  1768.                 ff_vc1_mc_4mv_luma(v, i, 0, 0);

  1769.             }

  1770.             ff_vc1_mc_4mv_chroma(v, 0);

  1771.             mb_has_coeffs = idx_mbmode & 1;

  1772.         }

  1773.         if (mb_has_coeffs)

  1774.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1775.         if (cbp) {

  1776.             GET_MQUANT();

  1777.         }

  1778.         s->current_picture.qscale_table[mb_pos] = mquant;

  1779.         if (!v->ttmbf && cbp) {

  1780.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1781.         }

  1782.         dst_idx = 0;

  1783.         for (i = 0; i < 6; i++) {

  1784.             s->dc_val[0][s->block_index[i]] = 0;

  1785.             dst_idx += i >> 2;

  1786.             val = ((cbp >> (5 - i)) & 1);

  1787.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  1788.             if (val) {

  1789.                 pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,

  1790.                                          first_block, s->dest[dst_idx] + off,

  1791.                                          (i & 4) ? s->uvlinesize : s->linesize,

  1792.                                          CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY),

  1793.                                          &block_tt);

  1794.                 block_cbp |= pat << (i << 2);

  1795.                 if (!v->ttmbf && ttmb < 8)

  1796.                     ttmb = -1;

  1797.                 first_block = 0;

  1798.             }

  1799.         }

  1800.     }

  1801.     if (v->overlap && v->pq >= 9)

  1802.         ff_vc1_p_overlap_filter(v);

  1803.     vc1_put_signed_blocks_clamped(v);

  1804. 

  1805.     v->cbp[s->mb_x]      = block_cbp;

  1806.     v->ttblk[s->mb_x]    = block_tt;

  1807. 

  1808.     return 0;

  1809. }

  1810. 

  1811. /** Decode one B-frame MB (in Main profile)

  1812.  */

  1813. static void vc1_decode_b_mb(VC1Context *v)

  1814. {

  1815.     MpegEncContext *s = &v->s;

  1816.     GetBitContext *gb = &s->gb;

  1817.     int i, j;

  1818.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1819.     int cbp = 0; /* cbp decoding stuff */

  1820.     int mqdiff, mquant; /* MB quantization */

  1821.     int ttmb = v->ttfrm; /* MB Transform type */

  1822.     int mb_has_coeffs = 0; /* last_flag */

  1823.     int index, index1; /* LUT indexes */

  1824.     int val, sign; /* temp values */

  1825.     int first_block = 1;

  1826.     int dst_idx, off;

  1827.     int skipped, direct;

  1828.     int dmv_x[2], dmv_y[2];

  1829.     int bmvtype = BMV_TYPE_BACKWARD;

  1830. 

  1831.     mquant      = v->pq; /* lossy initialization */

  1832.     s->mb_intra = 0;

  1833. 

  1834.     if (v->dmb_is_raw)

  1835.         direct = get_bits1(gb);

  1836.     else

  1837.         direct = v->direct_mb_plane[mb_pos];

  1838.     if (v->skip_is_raw)

  1839.         skipped = get_bits1(gb);

  1840.     else

  1841.         skipped = v->s.mbskip_table[mb_pos];

  1842. 

  1843.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  1844.     for (i = 0; i < 6; i++) {

  1845.         v->mb_type[0][s->block_index[i]] = 0;

  1846.         s->dc_val[0][s->block_index[i]]  = 0;

  1847.     }

  1848.     s->current_picture.qscale_table[mb_pos] = 0;

  1849. 

  1850.     if (!direct) {

  1851.         if (!skipped) {

  1852.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  1853.             dmv_x[1] = dmv_x[0];

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

  1855.         }

  1856.         if (skipped || !s->mb_intra) {

  1857.             bmvtype = decode012(gb);

  1858.             switch (bmvtype) {

  1859.             case 0:

  1860.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  1861.                 break;

  1862.             case 1:

  1863.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  1864.                 break;

  1865.             case 2:

  1866.                 bmvtype  = BMV_TYPE_INTERPOLATED;

  1867.                 dmv_x[0] = dmv_y[0] = 0;

  1868.             }

  1869.         }

  1870.     }

  1871.     for (i = 0; i < 6; i++)

  1872.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  1873. 

  1874.     if (skipped) {

  1875.         if (direct)

  1876.             bmvtype = BMV_TYPE_INTERPOLATED;

  1877.         ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1878.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1879.         return;

  1880.     }

  1881.     if (direct) {

  1882.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1883.         GET_MQUANT();

  1884.         s->mb_intra = 0;

  1885.         s->current_picture.qscale_table[mb_pos] = mquant;

  1886.         if (!v->ttmbf)

  1887.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1888.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  1889.         ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1890.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1891.     } else {

  1892.         if (!mb_has_coeffs && !s->mb_intra) {

  1893.             /* no coded blocks - effectively skipped */

  1894.             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1895.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1896.             return;

  1897.         }

  1898.         if (s->mb_intra && !mb_has_coeffs) {

  1899.             GET_MQUANT();

  1900.             s->current_picture.qscale_table[mb_pos] = mquant;

  1901.             s->ac_pred = get_bits1(gb);

  1902.             cbp = 0;

  1903.             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1904.         } else {

  1905.             if (bmvtype == BMV_TYPE_INTERPOLATED) {

  1906.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  1907.                 if (!mb_has_coeffs) {

  1908.                     /* interpolated skipped block */

  1909.                     ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1910.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1911.                     return;

  1912.                 }

  1913.             }

  1914.             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1915.             if (!s->mb_intra) {

  1916.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1917.             }

  1918.             if (s->mb_intra)

  1919.                 s->ac_pred = get_bits1(gb);

  1920.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1921.             GET_MQUANT();

  1922.             s->current_picture.qscale_table[mb_pos] = mquant;

  1923.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  1924.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1925.         }

  1926.     }

  1927.     dst_idx = 0;

  1928.     for (i = 0; i < 6; i++) {

  1929.         s->dc_val[0][s->block_index[i]] = 0;

  1930.         dst_idx += i >> 2;

  1931.         val = ((cbp >> (5 - i)) & 1);

  1932.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1933.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  1934.         if (s->mb_intra) {

  1935.             /* check if prediction blocks A and C are available */

  1936.             v->a_avail = v->c_avail = 0;

  1937.             if (i == 2 || i == 3 || !s->first_slice_line)

  1938.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1939.             if (i == 1 || i == 3 || s->mb_x)

  1940.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1941. 

  1942.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  1943.                                    (i & 4) ? v->codingset2 : v->codingset);

  1944.             if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  1945.                 continue;

  1946.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  1947.             if (v->rangeredfrm)

  1948.                 for (j = 0; j < 64; j++)

  1949.                     s->block[i][j] <<= 1;

  1950.             s->idsp.put_signed_pixels_clamped(s->block[i],

  1951.                                               s->dest[dst_idx] + off,

  1952.                                               i & 4 ? s->uvlinesize

  1953.                                                     : s->linesize);

  1954.         } else if (val) {

  1955.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  1956.                                first_block, s->dest[dst_idx] + off,

  1957.                                (i & 4) ? s->uvlinesize : s->linesize,

  1958.                                CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), NULL);

  1959.             if (!v->ttmbf && ttmb < 8)

  1960.                 ttmb = -1;

  1961.             first_block = 0;

  1962.         }

  1963.     }

  1964. }

  1965. 

  1966. /** Decode one B-frame MB (in interlaced field B picture)

  1967.  */

  1968. static void vc1_decode_b_mb_intfi(VC1Context *v)

  1969. {

  1970.     MpegEncContext *s = &v->s;

  1971.     GetBitContext *gb = &s->gb;

  1972.     int i, j;

  1973.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1974.     int cbp = 0; /* cbp decoding stuff */

  1975.     int mqdiff, mquant; /* MB quantization */

  1976.     int ttmb = v->ttfrm; /* MB Transform type */

  1977.     int mb_has_coeffs = 0; /* last_flag */

  1978.     int val; /* temp value */

  1979.     int first_block = 1;

  1980.     int dst_idx, off;

  1981.     int fwd;

  1982.     int dmv_x[2], dmv_y[2], pred_flag[2];

  1983.     int bmvtype = BMV_TYPE_BACKWARD;

  1984.     int block_cbp = 0, pat, block_tt = 0;

  1985.     int idx_mbmode;

  1986. 

  1987.     mquant      = v->pq; /* Lossy initialization */

  1988.     s->mb_intra = 0;

  1989. 

  1990.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  1991.     if (idx_mbmode <= 1) { // intra MB

  1992.         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.

  1993.         s->mb_intra          = 1;

  1994.         s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  1995.         s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  1996.         s->current_picture.mb_type[mb_pos + v->mb_off]         = MB_TYPE_INTRA;

  1997.         GET_MQUANT();

  1998.         s->current_picture.qscale_table[mb_pos] = mquant;

  1999.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  2000.         s->y_dc_scale = s->y_dc_scale_table[FFABS(mquant)];

  2001.         s->c_dc_scale = s->c_dc_scale_table[FFABS(mquant)];

  2002.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  2003.         mb_has_coeffs = idx_mbmode & 1;

  2004.         if (mb_has_coeffs)

  2005.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  2006.         dst_idx = 0;

  2007.         for (i = 0; i < 6; i++) {

  2008.             v->a_avail = v->c_avail          = 0;

  2009.             v->mb_type[0][s->block_index[i]] = 1;

  2010.             s->dc_val[0][s->block_index[i]]  = 0;

  2011.             dst_idx += i >> 2;

  2012.             val = ((cbp >> (5 - i)) & 1);

  2013.             if (i == 2 || i == 3 || !s->first_slice_line)

  2014.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2015.             if (i == 1 || i == 3 || s->mb_x)

  2016.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2017. 

  2018.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  2019.                                    (i & 4) ? v->codingset2 : v->codingset);

  2020.             if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  2021.                 continue;

  2022.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  2023.             if (v->rangeredfrm)

  2024.                 for (j = 0; j < 64; j++)

  2025.                     s->block[i][j] <<= 1;

  2026.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2027.             s->idsp.put_signed_pixels_clamped(s->block[i],

  2028.                                               s->dest[dst_idx] + off,

  2029.                                               (i & 4) ? s->uvlinesize

  2030.                                                       : s->linesize);

  2031.         }

  2032.     } else {

  2033.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  2034.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  2035.         for (i = 0; i < 6; i++)

  2036.             v->mb_type[0][s->block_index[i]] = 0;

  2037.         if (v->fmb_is_raw)

  2038.             fwd = v->forward_mb_plane[mb_pos] = get_bits1(gb);

  2039.         else

  2040.             fwd = v->forward_mb_plane[mb_pos];

  2041.         if (idx_mbmode <= 5) { // 1-MV

  2042.             int interpmvp = 0;

  2043.             dmv_x[0]     = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  2044.             pred_flag[0] = pred_flag[1] = 0;

  2045.             if (fwd)

  2046.                 bmvtype = BMV_TYPE_FORWARD;

  2047.             else {

  2048.                 bmvtype = decode012(gb);

  2049.                 switch (bmvtype) {

  2050.                 case 0:

  2051.                     bmvtype = BMV_TYPE_BACKWARD;

  2052.                     break;

  2053.                 case 1:

  2054.                     bmvtype = BMV_TYPE_DIRECT;

  2055.                     break;

  2056.                 case 2:

  2057.                     bmvtype   = BMV_TYPE_INTERPOLATED;

  2058.                     interpmvp = get_bits1(gb);

  2059.                 }

  2060.             }

  2061.             v->bmvtype = bmvtype;

  2062.             if (bmvtype != BMV_TYPE_DIRECT && idx_mbmode & 1) {

  2063.                 get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD], &dmv_y[bmvtype == BMV_TYPE_BACKWARD], &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  2064.             }

  2065.             if (interpmvp) {

  2066.                 get_mvdata_interlaced(v, &dmv_x[1], &dmv_y[1], &pred_flag[1]);

  2067.             }

  2068.             if (bmvtype == BMV_TYPE_DIRECT) {

  2069.                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  2070.                 dmv_x[1] = dmv_y[1] = pred_flag[0] = 0;

  2071.                 if (!s->next_picture_ptr->field_picture) {

  2072.                     av_log(s->avctx, AV_LOG_ERROR, "Mixed field/frame direct mode not supported\n");

  2073.                     return;

  2074.                 }

  2075.             }

  2076.             ff_vc1_pred_b_mv_intfi(v, 0, dmv_x, dmv_y, 1, pred_flag);

  2077.             vc1_b_mc(v, dmv_x, dmv_y, (bmvtype == BMV_TYPE_DIRECT), bmvtype);

  2078.             mb_has_coeffs = !(idx_mbmode & 2);

  2079.         } else { // 4-MV

  2080.             if (fwd)

  2081.                 bmvtype = BMV_TYPE_FORWARD;

  2082.             v->bmvtype  = bmvtype;

  2083.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  2084.             for (i = 0; i < 4; i++) {

  2085.                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  2086.                 dmv_x[1] = dmv_y[1] = pred_flag[1] = 0;

  2087.                 if (v->fourmvbp & (8 >> i)) {

  2088.                     get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD],

  2089.                                              &dmv_y[bmvtype == BMV_TYPE_BACKWARD],

  2090.                                          &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  2091.                 }

  2092.                 ff_vc1_pred_b_mv_intfi(v, i, dmv_x, dmv_y, 0, pred_flag);

  2093.                 ff_vc1_mc_4mv_luma(v, i, bmvtype == BMV_TYPE_BACKWARD, 0);

  2094.             }

  2095.             ff_vc1_mc_4mv_chroma(v, bmvtype == BMV_TYPE_BACKWARD);

  2096.             mb_has_coeffs = idx_mbmode & 1;

  2097.         }

  2098.         if (mb_has_coeffs)

  2099.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2100.         if (cbp) {

  2101.             GET_MQUANT();

  2102.         }

  2103.         s->current_picture.qscale_table[mb_pos] = mquant;

  2104.         if (!v->ttmbf && cbp) {

  2105.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  2106.         }

  2107.         dst_idx = 0;

  2108.         for (i = 0; i < 6; i++) {

  2109.             s->dc_val[0][s->block_index[i]] = 0;

  2110.             dst_idx += i >> 2;

  2111.             val = ((cbp >> (5 - i)) & 1);

  2112.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  2113.             if (val) {

  2114.                 pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  2115.                                          first_block, s->dest[dst_idx] + off,

  2116.                                          (i & 4) ? s->uvlinesize : s->linesize,

  2117.                                          CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);

  2118.                 block_cbp |= pat << (i << 2);

  2119.                 if (!v->ttmbf && ttmb < 8)

  2120.                     ttmb = -1;

  2121.                 first_block = 0;

  2122.             }

  2123.         }

  2124.     }

  2125.     v->cbp[s->mb_x]      = block_cbp;

  2126.     v->ttblk[s->mb_x]    = block_tt;

  2127. }

  2128. 

  2129. /** Decode one B-frame MB (in interlaced frame B picture)

  2130.  */

  2131. static int vc1_decode_b_mb_intfr(VC1Context *v)

  2132. {

  2133.     MpegEncContext *s = &v->s;

  2134.     GetBitContext *gb = &s->gb;

  2135.     int i, j;

  2136.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2137.     int cbp = 0; /* cbp decoding stuff */

  2138.     int mqdiff, mquant; /* MB quantization */

  2139.     int ttmb = v->ttfrm; /* MB Transform type */

  2140.     int mvsw = 0; /* motion vector switch */

  2141.     int mb_has_coeffs = 1; /* last_flag */

  2142.     int dmv_x, dmv_y; /* Differential MV components */

  2143.     int val; /* temp value */

  2144.     int first_block = 1;

  2145.     int dst_idx, off;

  2146.     int skipped, direct, twomv = 0;

  2147.     int block_cbp = 0, pat, block_tt = 0;

  2148.     int idx_mbmode = 0, mvbp;

  2149.     int stride_y, fieldtx;

  2150.     int bmvtype = BMV_TYPE_BACKWARD;

  2151.     int dir, dir2;

  2152. 

  2153.     mquant = v->pq; /* Lossy initialization */

  2154.     s->mb_intra = 0;

  2155.     if (v->skip_is_raw)

  2156.         skipped = get_bits1(gb);

  2157.     else

  2158.         skipped = v->s.mbskip_table[mb_pos];

  2159. 

  2160.     if (!skipped) {

  2161.         idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2);

  2162.         if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {

  2163.             twomv = 1;

  2164.             v->blk_mv_type[s->block_index[0]] = 1;

  2165.             v->blk_mv_type[s->block_index[1]] = 1;

  2166.             v->blk_mv_type[s->block_index[2]] = 1;

  2167.             v->blk_mv_type[s->block_index[3]] = 1;

  2168.         } else {

  2169.             v->blk_mv_type[s->block_index[0]] = 0;

  2170.             v->blk_mv_type[s->block_index[1]] = 0;

  2171.             v->blk_mv_type[s->block_index[2]] = 0;

  2172.             v->blk_mv_type[s->block_index[3]] = 0;

  2173.         }

  2174.     }

  2175. 

  2176.     if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB

  2177.         for (i = 0; i < 4; i++) {

  2178.             s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = 0;

  2179.             s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = 0;

  2180.             s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = 0;

  2181.             s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = 0;

  2182.         }

  2183.         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.

  2184.         s->mb_intra          = 1;

  2185.         s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  2186.         fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);

  2187.         mb_has_coeffs = get_bits1(gb);

  2188.         if (mb_has_coeffs)

  2189.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2190.         v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);

  2191.         GET_MQUANT();

  2192.         s->current_picture.qscale_table[mb_pos] = mquant;

  2193.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  2194.         s->y_dc_scale = s->y_dc_scale_table[FFABS(mquant)];

  2195.         s->c_dc_scale = s->c_dc_scale_table[FFABS(mquant)];

  2196.         dst_idx = 0;

  2197.         for (i = 0; i < 6; i++) {

  2198.             v->a_avail = v->c_avail          = 0;

  2199.             v->mb_type[0][s->block_index[i]] = 1;

  2200.             s->dc_val[0][s->block_index[i]]  = 0;

  2201.             dst_idx += i >> 2;

  2202.             val = ((cbp >> (5 - i)) & 1);

  2203.             if (i == 2 || i == 3 || !s->first_slice_line)

  2204.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2205.             if (i == 1 || i == 3 || s->mb_x)

  2206.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2207. 

  2208.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  2209.                                    (i & 4) ? v->codingset2 : v->codingset);

  2210.             if (CONFIG_GRAY && i > 3 && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  2211.                 continue;

  2212.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  2213.             if (i < 4) {

  2214.                 stride_y = s->linesize << fieldtx;

  2215.                 off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;

  2216.             } else {

  2217.                 stride_y = s->uvlinesize;

  2218.                 off = 0;

  2219.             }

  2220.             s->idsp.put_signed_pixels_clamped(s->block[i],

  2221.                                               s->dest[dst_idx] + off,

  2222.                                               stride_y);

  2223.         }

  2224.     } else {

  2225.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  2226. 

  2227.         if (v->dmb_is_raw)

  2228.             direct = get_bits1(gb);

  2229.         else

  2230.             direct = v->direct_mb_plane[mb_pos];

  2231. 

  2232.         if (direct) {

  2233.             if (s->next_picture_ptr->field_picture)

  2234.                 av_log(s->avctx, AV_LOG_WARNING, "Mixed frame/field direct mode not supported\n");

  2235.             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);

  2236.             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);

  2237.             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);

  2238.             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);

  2239. 

  2240.             if (twomv) {

  2241.                 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);

  2242.                 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);

  2243.                 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);

  2244.                 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);

  2245. 

  2246.                 for (i = 1; i < 4; i += 2) {

  2247.                     s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][i-1][0];

  2248.                     s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][i-1][1];

  2249.                     s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][i-1][0];

  2250.                     s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][i-1][1];

  2251.                 }

  2252.             } else {

  2253.                 for (i = 1; i < 4; i++) {

  2254.                     s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][0][0];

  2255.                     s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][0][1];

  2256.                     s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][0][0];

  2257.                     s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][0][1];

  2258.                 }

  2259.             }

  2260.         }

  2261. 

  2262.         if (!direct) {

  2263.             if (skipped || !s->mb_intra) {

  2264.                 bmvtype = decode012(gb);

  2265.                 switch (bmvtype) {

  2266.                 case 0:

  2267.                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  2268.                     break;

  2269.                 case 1:

  2270.                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  2271.                     break;

  2272.                 case 2:

  2273.                     bmvtype  = BMV_TYPE_INTERPOLATED;

  2274.                 }

  2275.             }

  2276. 

  2277.             if (twomv && bmvtype != BMV_TYPE_INTERPOLATED)

  2278.                 mvsw = get_bits1(gb);

  2279.         }

  2280. 

  2281.         if (!skipped) { // inter MB

  2282.             mb_has_coeffs = ff_vc1_mbmode_intfrp[0][idx_mbmode][3];

  2283.             if (mb_has_coeffs)

  2284.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2285.             if (!direct) {

  2286.                 if (bmvtype == BMV_TYPE_INTERPOLATED && twomv) {

  2287.                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  2288.                 } else if (bmvtype == BMV_TYPE_INTERPOLATED || twomv) {

  2289.                     v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);

  2290.                 }

  2291.             }

  2292. 

  2293.             for (i = 0; i < 6; i++)

  2294.                 v->mb_type[0][s->block_index[i]] = 0;

  2295.             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[0][idx_mbmode][1];

  2296.             /* for all motion vector read MVDATA and motion compensate each block */

  2297.             dst_idx = 0;

  2298.             if (direct) {

  2299.                 if (twomv) {

  2300.                     for (i = 0; i < 4; i++) {

  2301.                         ff_vc1_mc_4mv_luma(v, i, 0, 0);

  2302.                         ff_vc1_mc_4mv_luma(v, i, 1, 1);

  2303.                     }

  2304.                     ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);

  2305.                     ff_vc1_mc_4mv_chroma4(v, 1, 1, 1);

  2306.                 } else {

  2307.                     ff_vc1_mc_1mv(v, 0);

  2308.                     ff_vc1_interp_mc(v);

  2309.                 }

  2310.             } else if (twomv && bmvtype == BMV_TYPE_INTERPOLATED) {

  2311.                 mvbp = v->fourmvbp;

  2312.                 for (i = 0; i < 4; i++) {

  2313.                     dir = i==1 || i==3;

  2314.                     dmv_x = dmv_y = 0;

  2315.                     val = ((mvbp >> (3 - i)) & 1);

  2316.                     if (val)

  2317.                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2318.                     j = i > 1 ? 2 : 0;

  2319.                     ff_vc1_pred_mv_intfr(v, j, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);

  2320.                     ff_vc1_mc_4mv_luma(v, j, dir, dir);

  2321.                     ff_vc1_mc_4mv_luma(v, j+1, dir, dir);

  2322.                 }

  2323. 

  2324.                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);

  2325.                 ff_vc1_mc_4mv_chroma4(v, 1, 1, 1);

  2326.             } else if (bmvtype == BMV_TYPE_INTERPOLATED) {

  2327.                 mvbp = v->twomvbp;

  2328.                 dmv_x = dmv_y = 0;

  2329.                 if (mvbp & 2)

  2330.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2331. 

  2332.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  2333.                 ff_vc1_mc_1mv(v, 0);

  2334. 

  2335.                 dmv_x = dmv_y = 0;

  2336.                 if (mvbp & 1)

  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], 1);

  2340.                 ff_vc1_interp_mc(v);

  2341.             } else if (twomv) {

  2342.                 dir = bmvtype == BMV_TYPE_BACKWARD;

  2343.                 dir2 = dir;

  2344.                 if (mvsw)

  2345.                     dir2 = !dir;

  2346.                 mvbp = v->twomvbp;

  2347.                 dmv_x = dmv_y = 0;

  2348.                 if (mvbp & 2)

  2349.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2350.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);

  2351. 

  2352.                 dmv_x = dmv_y = 0;

  2353.                 if (mvbp & 1)

  2354.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2355.                 ff_vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir2);

  2356. 

  2357.                 if (mvsw) {

  2358.                     for (i = 0; i < 2; i++) {

  2359.                         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];

  2360.                         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];

  2361.                         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];

  2362.                         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];

  2363.                     }

  2364.                 } else {

  2365.                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);

  2366.                     ff_vc1_pred_mv_intfr(v, 2, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);

  2367.                 }

  2368. 

  2369.                 ff_vc1_mc_4mv_luma(v, 0, dir, 0);

  2370.                 ff_vc1_mc_4mv_luma(v, 1, dir, 0);

  2371.                 ff_vc1_mc_4mv_luma(v, 2, dir2, 0);

  2372.                 ff_vc1_mc_4mv_luma(v, 3, dir2, 0);

  2373.                 ff_vc1_mc_4mv_chroma4(v, dir, dir2, 0);

  2374.             } else {

  2375.                 dir = bmvtype == BMV_TYPE_BACKWARD;

  2376. 

  2377.                 mvbp = ff_vc1_mbmode_intfrp[0][idx_mbmode][2];

  2378.                 dmv_x = dmv_y = 0;

  2379.                 if (mvbp)

  2380.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2381. 

  2382.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], dir);

  2383.                 v->blk_mv_type[s->block_index[0]] = 1;

  2384.                 v->blk_mv_type[s->block_index[1]] = 1;

  2385.                 v->blk_mv_type[s->block_index[2]] = 1;

  2386.                 v->blk_mv_type[s->block_index[3]] = 1;

  2387.                 ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);

  2388.                 for (i = 0; i < 2; i++) {

  2389.                     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];

  2390.                     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];

  2391.                 }

  2392.                 ff_vc1_mc_1mv(v, dir);

  2393.             }

  2394. 

  2395.             if (cbp)

  2396.                 GET_MQUANT();  // p. 227

  2397.             s->current_picture.qscale_table[mb_pos] = mquant;

  2398.             if (!v->ttmbf && cbp)

  2399.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  2400.             for (i = 0; i < 6; i++) {

  2401.                 s->dc_val[0][s->block_index[i]] = 0;

  2402.                 dst_idx += i >> 2;

  2403.                 val = ((cbp >> (5 - i)) & 1);

  2404.                 if (!fieldtx)

  2405.                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2406.                 else

  2407.                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));

  2408.                 if (val) {

  2409.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  2410.                                              first_block, s->dest[dst_idx] + off,

  2411.                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),

  2412.                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);

  2413.                     block_cbp |= pat << (i << 2);

  2414.                     if (!v->ttmbf && ttmb < 8)

  2415.                         ttmb = -1;

  2416.                     first_block = 0;

  2417.                 }

  2418.             }

  2419. 

  2420.         } else { // skipped

  2421.             dir = 0;

  2422.             for (i = 0; i < 6; i++) {

  2423.                 v->mb_type[0][s->block_index[i]] = 0;

  2424.                 s->dc_val[0][s->block_index[i]] = 0;

  2425.             }

  2426.             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  2427.             s->current_picture.qscale_table[mb_pos] = 0;

  2428.             v->blk_mv_type[s->block_index[0]] = 0;

  2429.             v->blk_mv_type[s->block_index[1]] = 0;

  2430.             v->blk_mv_type[s->block_index[2]] = 0;

  2431.             v->blk_mv_type[s->block_index[3]] = 0;

  2432. 

  2433.             if (!direct) {

  2434.                 if (bmvtype == BMV_TYPE_INTERPOLATED) {

  2435.                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  2436.                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 1);

  2437.                 } else {

  2438.                     dir = bmvtype == BMV_TYPE_BACKWARD;

  2439.                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], dir);

  2440.                     if (mvsw) {

  2441.                         int dir2 = dir;

  2442.                         if (mvsw)

  2443.                             dir2 = !dir;

  2444.                         for (i = 0; i < 2; i++) {

  2445.                             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];

  2446.                             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];

  2447.                             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];

  2448.                             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];

  2449.                         }

  2450.                     } else {

  2451.                         v->blk_mv_type[s->block_index[0]] = 1;

  2452.                         v->blk_mv_type[s->block_index[1]] = 1;

  2453.                         v->blk_mv_type[s->block_index[2]] = 1;

  2454.                         v->blk_mv_type[s->block_index[3]] = 1;

  2455.                         ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);

  2456.                         for (i = 0; i < 2; i++) {

  2457.                             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];

  2458.                             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];

  2459.                         }

  2460.                     }

  2461.                 }

  2462.             }

  2463. 

  2464.             ff_vc1_mc_1mv(v, dir);

  2465.             if (direct || bmvtype == BMV_TYPE_INTERPOLATED) {

  2466.                 ff_vc1_interp_mc(v);

  2467.             }

  2468.             v->fieldtx_plane[mb_pos] = 0;

  2469.         }

  2470.     }

  2471.     v->cbp[s->mb_x]      = block_cbp;

  2472.     v->ttblk[s->mb_x]    = block_tt;

  2473. 

  2474.     return 0;

  2475. }

  2476. 

  2477. /** Decode blocks of I-frame

  2478.  */

  2479. static void vc1_decode_i_blocks(VC1Context *v)

  2480. {

  2481.     int k, j;

  2482.     MpegEncContext *s = &v->s;

  2483.     int cbp, val;

  2484.     uint8_t *coded_val;

  2485.     int mb_pos;

  2486. 

  2487.     /* select coding mode used for VLC tables selection */

  2488.     switch (v->y_ac_table_index) {

  2489.     case 0:

  2490.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2491.         break;

  2492.     case 1:

  2493.         v->codingset = CS_HIGH_MOT_INTRA;

  2494.         break;

  2495.     case 2:

  2496.         v->codingset = CS_MID_RATE_INTRA;

  2497.         break;

  2498.     }

  2499. 

  2500.     switch (v->c_ac_table_index) {

  2501.     case 0:

  2502.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2503.         break;

  2504.     case 1:

  2505.         v->codingset2 = CS_HIGH_MOT_INTER;

  2506.         break;

  2507.     case 2:

  2508.         v->codingset2 = CS_MID_RATE_INTER;

  2509.         break;

  2510.     }

  2511. 

  2512.     /* Set DC scale - y and c use the same */

  2513.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  2514.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  2515. 

  2516.     //do frame decode

  2517.     s->mb_x = s->mb_y = 0;

  2518.     s->mb_intra         = 1;

  2519.     s->first_slice_line = 1;

  2520.     for (s->mb_y = 0; s->mb_y < s->end_mb_y; s->mb_y++) {

  2521.         s->mb_x = 0;

  2522.         init_block_index(v);

  2523.         for (; s->mb_x < v->end_mb_x; s->mb_x++) {

  2524.             uint8_t *dst[6];

  2525.             ff_update_block_index(s);

  2526.             dst[0] = s->dest[0];

  2527.             dst[1] = dst[0] + 8;

  2528.             dst[2] = s->dest[0] + s->linesize * 8;

  2529.             dst[3] = dst[2] + 8;

  2530.             dst[4] = s->dest[1];

  2531.             dst[5] = s->dest[2];

  2532.             s->bdsp.clear_blocks(s->block[0]);

  2533.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  2534.             s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  2535.             s->current_picture.qscale_table[mb_pos]                = v->pq;

  2536.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  2537.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  2538. 

  2539.             // do actual MB decoding and displaying

  2540.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  2541.             v->s.ac_pred = get_bits1(&v->s.gb);

  2542. 

  2543.             for (k = 0; k < 6; k++) {

  2544.                 val = ((cbp >> (5 - k)) & 1);

  2545. 

  2546.                 if (k < 4) {

  2547.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  2548.                     val        = val ^ pred;

  2549.                     *coded_val = val;

  2550.                 }

  2551.                 cbp |= val << (5 - k);

  2552. 

  2553.                 vc1_decode_i_block(v, s->block[k], k, val, (k < 4) ? v->codingset : v->codingset2);

  2554. 

  2555.                 if (CONFIG_GRAY && k > 3 && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  2556.                     continue;

  2557.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[k]);

  2558.                 if (v->pq >= 9 && v->overlap) {

  2559.                     if (v->rangeredfrm)

  2560.                         for (j = 0; j < 64; j++)

  2561.                             s->block[k][j] <<= 1;

  2562.                     s->idsp.put_signed_pixels_clamped(s->block[k], dst[k],

  2563.                                                       k & 4 ? s->uvlinesize

  2564.                                                             : s->linesize);

  2565.                 } else {

  2566.                     if (v->rangeredfrm)

  2567.                         for (j = 0; j < 64; j++)

  2568.                             s->block[k][j] = (s->block[k][j] - 64) << 1;

  2569.                     s->idsp.put_pixels_clamped(s->block[k], dst[k],

  2570.                                                k & 4 ? s->uvlinesize

  2571.                                                      : s->linesize);

  2572.                 }

  2573.             }

  2574. 

  2575.             if (v->pq >= 9 && v->overlap) {

  2576.                 if (s->mb_x) {

  2577.                     v->vc1dsp.vc1_h_overlap(s->dest[0], s->linesize);

  2578.                     v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  2579.                     if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {

  2580.                         v->vc1dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  2581.                         v->vc1dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  2582.                     }

  2583.                 }

  2584.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  2585.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  2586.                 if (!s->first_slice_line) {

  2587.                     v->vc1dsp.vc1_v_overlap(s->dest[0], s->linesize);

  2588.                     v->vc1dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  2589.                     if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {

  2590.                         v->vc1dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  2591.                         v->vc1dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  2592.                     }

  2593.                 }

  2594.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  2595.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  2596.             }

  2597.             if (v->s.loop_filter)

  2598.                 ff_vc1_loop_filter_iblk(v, v->pq);

  2599. 

  2600.             if (get_bits_count(&s->gb) > v->bits) {

  2601.                 ff_er_add_slice(&s->er, 0, 0, s->mb_x, s->mb_y, ER_MB_ERROR);

  2602.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  2603.                        get_bits_count(&s->gb), v->bits);

  2604.                 return;

  2605.             }

  2606.         }

  2607.         if (!v->s.loop_filter)

  2608.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  2609.         else if (s->mb_y)

  2610.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  2611. 

  2612.         s->first_slice_line = 0;

  2613.     }

  2614.     if (v->s.loop_filter)

  2615.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  2616. 

  2617.     /* This is intentionally mb_height and not end_mb_y - unlike in advanced

  2618.      * profile, these only differ are when decoding MSS2 rectangles. */

  2619.     ff_er_add_slice(&s->er, 0, 0, s->mb_width - 1, s->mb_height - 1, ER_MB_END);

  2620. }

  2621. 

  2622. /** Decode blocks of I-frame for advanced profile

  2623.  */

  2624. static void vc1_decode_i_blocks_adv(VC1Context *v)

  2625. {

  2626.     int k;

  2627.     MpegEncContext *s = &v->s;

  2628.     int cbp, val;

  2629.     uint8_t *coded_val;

  2630.     int mb_pos;

  2631.     int mquant;

  2632.     int mqdiff;

  2633.     GetBitContext *gb = &s->gb;

  2634. 

  2635.     /* select coding mode used for VLC tables selection */

  2636.     switch (v->y_ac_table_index) {

  2637.     case 0:

  2638.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2639.         break;

  2640.     case 1:

  2641.         v->codingset = CS_HIGH_MOT_INTRA;

  2642.         break;

  2643.     case 2:

  2644.         v->codingset = CS_MID_RATE_INTRA;

  2645.         break;

  2646.     }

  2647. 

  2648.     switch (v->c_ac_table_index) {

  2649.     case 0:

  2650.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2651.         break;

  2652.     case 1:

  2653.         v->codingset2 = CS_HIGH_MOT_INTER;

  2654.         break;

  2655.     case 2:

  2656.         v->codingset2 = CS_MID_RATE_INTER;

  2657.         break;

  2658.     }

  2659. 

  2660.     // do frame decode

  2661.     s->mb_x             = s->mb_y = 0;

  2662.     s->mb_intra         = 1;

  2663.     s->first_slice_line = 1;

  2664.     s->mb_y             = s->start_mb_y;

  2665.     if (s->start_mb_y) {

  2666.         s->mb_x = 0;

  2667.         init_block_index(v);

  2668.         memset(&s->coded_block[s->block_index[0] - s->b8_stride], 0,

  2669.                (1 + s->b8_stride) * sizeof(*s->coded_block));

  2670.     }

  2671.     for (; s->mb_y < s->end_mb_y; s->mb_y++) {

  2672.         s->mb_x = 0;

  2673.         init_block_index(v);

  2674.         for (;s->mb_x < s->mb_width; s->mb_x++) {

  2675.             int16_t (*block)[64] = v->block[v->cur_blk_idx];

  2676.             mquant = v->pq;

  2677.             ff_update_block_index(s);

  2678.             s->bdsp.clear_blocks(block[0]);

  2679.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2680.             s->current_picture.mb_type[mb_pos + v->mb_off]                         = MB_TYPE_INTRA;

  2681.             for (int i = 0; i < 4; i++) {

  2682.                 s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][0] = 0;

  2683.                 s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][1] = 0;

  2684.             }

  2685. 

  2686.             // do actual MB decoding and displaying

  2687.             if (v->fieldtx_is_raw)

  2688.                 v->fieldtx_plane[mb_pos] = get_bits1(&v->s.gb);

  2689.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  2690.             if (v->acpred_is_raw)

  2691.                 v->s.ac_pred = get_bits1(&v->s.gb);

  2692.             else

  2693.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  2694. 

  2695.             if (v->condover == CONDOVER_SELECT && v->overflg_is_raw)

  2696.                 v->over_flags_plane[mb_pos] = get_bits1(&v->s.gb);

  2697. 

  2698.             GET_MQUANT();

  2699. 

  2700.             s->current_picture.qscale_table[mb_pos] = mquant;

  2701.             /* Set DC scale - y and c use the same */

  2702.             s->y_dc_scale = s->y_dc_scale_table[FFABS(mquant)];

  2703.             s->c_dc_scale = s->c_dc_scale_table[FFABS(mquant)];

  2704. 

  2705.             for (k = 0; k < 6; k++) {

  2706.                 v->mb_type[0][s->block_index[k]] = 1;

  2707. 

  2708.                 val = ((cbp >> (5 - k)) & 1);

  2709. 

  2710.                 if (k < 4) {

  2711.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  2712.                     val        = val ^ pred;

  2713.                     *coded_val = val;

  2714.                 }

  2715.                 cbp |= val << (5 - k);

  2716. 

  2717.                 v->a_avail = !s->first_slice_line || (k == 2 || k == 3);

  2718.                 v->c_avail = !!s->mb_x || (k == 1 || k == 3);

  2719. 

  2720.                 vc1_decode_i_block_adv(v, block[k], k, val,

  2721.                                        (k < 4) ? v->codingset : v->codingset2, mquant);

  2722. 

  2723.                 if (CONFIG_GRAY && k > 3 && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  2724.                     continue;

  2725.                 v->vc1dsp.vc1_inv_trans_8x8(block[k]);

  2726.             }

  2727. 

  2728.             if (v->overlap && v->condover != CONDOVER_NONE)

  2729.                 ff_vc1_i_overlap_filter(v);

  2730.             vc1_put_signed_blocks_clamped(v);

  2731.             if (v->s.loop_filter)

  2732.                 ff_vc1_i_loop_filter(v);

  2733. 

  2734.             if (get_bits_count(&s->gb) > v->bits) {

  2735.                 // TODO: may need modification to handle slice coding

  2736.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  2737.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  2738.                        get_bits_count(&s->gb), v->bits);

  2739.                 return;

  2740.             }

  2741.             inc_blk_idx(v->topleft_blk_idx);

  2742.             inc_blk_idx(v->top_blk_idx);

  2743.             inc_blk_idx(v->left_blk_idx);

  2744.             inc_blk_idx(v->cur_blk_idx);

  2745.         }

  2746.         if (!v->s.loop_filter)

  2747.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  2748.         else if (s->mb_y)

  2749.             ff_mpeg_draw_horiz_band(s, (s->mb_y-1) * 16, 16);

  2750.         s->first_slice_line = 0;

  2751.     }

  2752. 

  2753.     if (v->s.loop_filter)

  2754.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  2755.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  2756.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  2757. }

  2758. 

  2759. static void vc1_decode_p_blocks(VC1Context *v)

  2760. {

  2761.     MpegEncContext *s = &v->s;

  2762.     int apply_loop_filter;

  2763. 

  2764.     /* select coding mode used for VLC tables selection */

  2765.     switch (v->c_ac_table_index) {

  2766.     case 0:

  2767.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2768.         break;

  2769.     case 1:

  2770.         v->codingset = CS_HIGH_MOT_INTRA;

  2771.         break;

  2772.     case 2:

  2773.         v->codingset = CS_MID_RATE_INTRA;

  2774.         break;

  2775.     }

  2776. 

  2777.     switch (v->c_ac_table_index) {

  2778.     case 0:

  2779.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2780.         break;

  2781.     case 1:

  2782.         v->codingset2 = CS_HIGH_MOT_INTER;

  2783.         break;

  2784.     case 2:

  2785.         v->codingset2 = CS_MID_RATE_INTER;

  2786.         break;

  2787.     }

  2788. 

  2789.     apply_loop_filter   = s->loop_filter && !(s->avctx->skip_loop_filter >= AVDISCARD_NONKEY);

  2790.     s->first_slice_line = 1;

  2791.     memset(v->cbp_base, 0, sizeof(v->cbp_base[0]) * 3 * s->mb_stride);

  2792.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  2793.         s->mb_x = 0;

  2794.         init_block_index(v);

  2795.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  2796.             ff_update_block_index(s);

  2797. 

  2798.             if (v->fcm == ILACE_FIELD) {

  2799.                 vc1_decode_p_mb_intfi(v);

  2800.                 if (apply_loop_filter)

  2801.                     ff_vc1_p_loop_filter(v);

  2802.             } else if (v->fcm == ILACE_FRAME) {

  2803.                 vc1_decode_p_mb_intfr(v);

  2804.                 if (apply_loop_filter)

  2805.                     ff_vc1_p_intfr_loop_filter(v);

  2806.             } else {

  2807.                 vc1_decode_p_mb(v);

  2808.                 if (apply_loop_filter)

  2809.                     ff_vc1_p_loop_filter(v);

  2810.             }

  2811.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  2812.                 // TODO: may need modification to handle slice coding

  2813.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  2814.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  2815.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  2816.                 return;

  2817.             }

  2818.             inc_blk_idx(v->topleft_blk_idx);

  2819.             inc_blk_idx(v->top_blk_idx);

  2820.             inc_blk_idx(v->left_blk_idx);

  2821.             inc_blk_idx(v->cur_blk_idx);

  2822.         }

  2823.         memmove(v->cbp_base,

  2824.                 v->cbp - s->mb_stride,

  2825.                 sizeof(v->cbp_base[0]) * 2 * s->mb_stride);

  2826.         memmove(v->ttblk_base,

  2827.                 v->ttblk - s->mb_stride,

  2828.                 sizeof(v->ttblk_base[0]) * 2 * s->mb_stride);

  2829.         memmove(v->is_intra_base,

  2830.                 v->is_intra - s->mb_stride,

  2831.                 sizeof(v->is_intra_base[0]) * 2 * s->mb_stride);

  2832.         memmove(v->luma_mv_base,

  2833.                 v->luma_mv - s->mb_stride,

  2834.                 sizeof(v->luma_mv_base[0]) * 2 * s->mb_stride);

  2835.         if (s->mb_y != s->start_mb_y)

  2836.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  2837.         s->first_slice_line = 0;

  2838.     }

  2839.     if (s->end_mb_y >= s->start_mb_y)

  2840.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  2841.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  2842.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  2843. }

  2844. 

  2845. static void vc1_decode_b_blocks(VC1Context *v)

  2846. {

  2847.     MpegEncContext *s = &v->s;

  2848. 

  2849.     /* select coding mode used for VLC tables selection */

  2850.     switch (v->c_ac_table_index) {

  2851.     case 0:

  2852.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2853.         break;

  2854.     case 1:

  2855.         v->codingset = CS_HIGH_MOT_INTRA;

  2856.         break;

  2857.     case 2:

  2858.         v->codingset = CS_MID_RATE_INTRA;

  2859.         break;

  2860.     }

  2861. 

  2862.     switch (v->c_ac_table_index) {

  2863.     case 0:

  2864.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2865.         break;

  2866.     case 1:

  2867.         v->codingset2 = CS_HIGH_MOT_INTER;

  2868.         break;

  2869.     case 2:

  2870.         v->codingset2 = CS_MID_RATE_INTER;

  2871.         break;

  2872.     }

  2873. 

  2874.     s->first_slice_line = 1;

  2875.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  2876.         s->mb_x = 0;

  2877.         init_block_index(v);

  2878.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  2879.             ff_update_block_index(s);

  2880. 

  2881.             if (v->fcm == ILACE_FIELD) {

  2882.                 vc1_decode_b_mb_intfi(v);

  2883.                 if (v->s.loop_filter)

  2884.                     ff_vc1_b_intfi_loop_filter(v);

  2885.             } else if (v->fcm == ILACE_FRAME) {

  2886.                 vc1_decode_b_mb_intfr(v);

  2887.                 if (v->s.loop_filter)

  2888.                     ff_vc1_p_intfr_loop_filter(v);

  2889.             } else {

  2890.                 vc1_decode_b_mb(v);

  2891.                 if (v->s.loop_filter)

  2892.                     ff_vc1_i_loop_filter(v);

  2893.             }

  2894.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  2895.                 // TODO: may need modification to handle slice coding

  2896.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  2897.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  2898.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  2899.                 return;

  2900.             }

  2901.         }

  2902.         memmove(v->cbp_base,

  2903.                 v->cbp - s->mb_stride,

  2904.                 sizeof(v->cbp_base[0]) * 2 * s->mb_stride);

  2905.         memmove(v->ttblk_base,

  2906.                 v->ttblk - s->mb_stride,

  2907.                 sizeof(v->ttblk_base[0]) * 2 * s->mb_stride);

  2908.         memmove(v->is_intra_base,

  2909.                 v->is_intra - s->mb_stride,

  2910.                 sizeof(v->is_intra_base[0]) * 2 * s->mb_stride);

  2911.         if (!v->s.loop_filter)

  2912.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  2913.         else if (s->mb_y)

  2914.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  2915.         s->first_slice_line = 0;

  2916.     }

  2917.     if (v->s.loop_filter)

  2918.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  2919.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  2920.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  2921. }

  2922. 

  2923. static void vc1_decode_skip_blocks(VC1Context *v)

  2924. {

  2925.     MpegEncContext *s = &v->s;

  2926. 

  2927.     if (!v->s.last_picture.f->data[0])

  2928.         return;

  2929. 

  2930.     ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_width - 1, s->end_mb_y - 1, ER_MB_END);

  2931.     s->first_slice_line = 1;

  2932.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  2933.         s->mb_x = 0;

  2934.         init_block_index(v);

  2935.         ff_update_block_index(s);

  2936.         memcpy(s->dest[0], s->last_picture.f->data[0] + s->mb_y * 16 * s->linesize,   s->linesize   * 16);

  2937.         memcpy(s->dest[1], s->last_picture.f->data[1] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  2938.         memcpy(s->dest[2], s->last_picture.f->data[2] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  2939.         ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  2940.         s->first_slice_line = 0;

  2941.     }

  2942.     s->pict_type = AV_PICTURE_TYPE_P;

  2943. }

  2944. 

  2945. void ff_vc1_decode_blocks(VC1Context *v)

  2946. {

  2947. 

  2948.     v->s.esc3_level_length = 0;

  2949.     if (v->x8_type) {

  2950.         ff_intrax8_decode_picture(&v->x8, &v->s.current_picture,

  2951.                                   &v->s.gb, &v->s.mb_x, &v->s.mb_y,

  2952.                                   2 * v->pq + v->halfpq, v->pq * !v->pquantizer,

  2953.                                   v->s.loop_filter, v->s.low_delay);

  2954. 

  2955.         ff_er_add_slice(&v->s.er, 0, 0,

  2956.                         (v->s.mb_x >> 1) - 1, (v->s.mb_y >> 1) - 1,

  2957.                         ER_MB_END);

  2958.     } else {

  2959.         v->cur_blk_idx     =  0;

  2960.         v->left_blk_idx    = -1;

  2961.         v->topleft_blk_idx =  1;

  2962.         v->top_blk_idx     =  2;

  2963.         switch (v->s.pict_type) {

  2964.         case AV_PICTURE_TYPE_I:

  2965.             if (v->profile == PROFILE_ADVANCED)

  2966.                 vc1_decode_i_blocks_adv(v);

  2967.             else

  2968.                 vc1_decode_i_blocks(v);

  2969.             break;

  2970.         case AV_PICTURE_TYPE_P:

  2971.             if (v->p_frame_skipped)

  2972.                 vc1_decode_skip_blocks(v);

  2973.             else

  2974.                 vc1_decode_p_blocks(v);

  2975.             break;

  2976.         case AV_PICTURE_TYPE_B:

  2977.             if (v->bi_type) {

  2978.                 if (v->profile == PROFILE_ADVANCED)

  2979.                     vc1_decode_i_blocks_adv(v);

  2980.                 else

  2981.                     vc1_decode_i_blocks(v);

  2982.             } else

  2983.                 vc1_decode_b_blocks(v);

  2984.             break;

  2985.         }

  2986.     }

  2987. }