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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->first_slice_line)                  \

  181.             mquant = v->altpq;                                 \

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

  183.             mquant = v->altpq;                                 \

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

  185.             mquant = v->altpq;                                 \

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

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

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

  189.             mquant = 1;                                        \

  190.         }                                                      \

  191.     }

  192. 

  193. /**

  194.  * @def GET_MVDATA(_dmv_x, _dmv_y)

  195.  * @brief Get MV differentials

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

  197.  * @param _dmv_x Horizontal differential for decoded MV

  198.  * @param _dmv_y Vertical differential for decoded MV

  199.  */

  200. #define GET_MVDATA(_dmv_x, _dmv_y)                                      \

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

  202.                          VC1_MV_DIFF_VLC_BITS, 2);                      \

  203.     if (index > 36) {                                                   \

  204.         mb_has_coeffs = 1;                                              \

  205.         index -= 37;                                                    \

  206.     } else                                                              \

  207.         mb_has_coeffs = 0;                                              \

  208.     s->mb_intra = 0;                                                    \

  209.     if (!index) {                                                       \

  210.         _dmv_x = _dmv_y = 0;                                            \

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

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

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

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

  215.         _dmv_x = 0;                                                     \

  216.         _dmv_y = 0;                                                     \

  217.         s->mb_intra = 1;                                                \

  218.     } else {                                                            \

  219.         index1 = index % 6;                                             \

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

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

  222.         if (val > 0) {                                                  \

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

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

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

  226.         }                                                               \

  227.                                                                         \

  228.         index1 = index / 6;                                             \

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

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

  231.         if (val > 0) {                                                  \

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

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

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

  235.         }                                                               \

  236.     }

  237. 

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

  239.                                                    int *dmv_y, int *pred_flag)

  240. {

  241.     int index, index1;

  242.     int extend_x, extend_y;

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

  244.     int bits, esc;

  245.     int val, sign;

  246. 

  247.     if (v->numref) {

  248.         bits = VC1_2REF_MVDATA_VLC_BITS;

  249.         esc  = 125;

  250.     } else {

  251.         bits = VC1_1REF_MVDATA_VLC_BITS;

  252.         esc  = 71;

  253.     }

  254.     extend_x = v->dmvrange & 1;

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

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

  257.     if (index == esc) {

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

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

  260.         if (v->numref) {

  261.             if (pred_flag)

  262.                 *pred_flag = *dmv_y & 1;

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

  264.         }

  265.     }

  266.     else {

  267.         av_assert0(index < esc);

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

  269.         if (index1 != 0) {

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

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

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

  273.         } else

  274.             *dmv_x = 0;

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

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

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

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

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

  280.         } else

  281.             *dmv_y = 0;

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

  283.             *pred_flag = index1 & 1;

  284.     }

  285. }

  286. 

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

  288.  */

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

  290.                             int direct, int mode)

  291. {

  292.     if (direct) {

  293.         ff_vc1_mc_1mv(v, 0);

  294.         ff_vc1_interp_mc(v);

  295.         return;

  296.     }

  297.     if (mode == BMV_TYPE_INTERPOLATED) {

  298.         ff_vc1_mc_1mv(v, 0);

  299.         ff_vc1_interp_mc(v);

  300.         return;

  301.     }

  302. 

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

  304. }

  305. 

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

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

  308.  * @param s MpegEncContext

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

  310.  * @param pq integer part of picture quantizer

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

  312.  * @param dc_val_ptr Pointer to DC predictor

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

  314.  */

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

  316.                                 int16_t **dc_val_ptr, int *dir_ptr)

  317. {

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

  319.     int16_t *dc_val;

  320.     static const uint16_t dcpred[32] = {

  321.         -1, 1024,  512,  341,  256,  205,  171,  146,  128,

  322.              114,  102,   93,   85,   79,   73,   68,   64,

  323.               60,   57,   54,   51,   49,   47,   45,   43,

  324.               41,   39,   38,   37,   35,   34,   33

  325.     };

  326. 

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

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

  329.     else       scale = s->c_dc_scale;

  330. 

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

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

  333. 

  334.     /* B A

  335.      * C X

  336.      */

  337.     c = dc_val[ - 1];

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

  339.     a = dc_val[ - wrap];

  340. 

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

  342.         /* Set outer values */

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

  344.             b = a = dcpred[scale];

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

  346.             b = c = dcpred[scale];

  347.     } else {

  348.         /* Set outer values */

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

  350.             b = a = 0;

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

  352.             b = c = 0;

  353.     }

  354. 

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

  356.         pred     = c;

  357.         *dir_ptr = 1; // left

  358.     } else {

  359.         pred     = a;

  360.         *dir_ptr = 0; // top

  361.     }

  362. 

  363.     /* update predictor */

  364.     *dc_val_ptr = &dc_val[0];

  365.     return pred;

  366. }

  367. 

  368. 

  369. /** Get predicted DC value

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

  371.  * @param s MpegEncContext

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

  373.  * @param pq integer part of picture quantizer

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

  375.  * @param a_avail flag indicating top block availability

  376.  * @param c_avail flag indicating left block availability

  377.  * @param dc_val_ptr Pointer to DC predictor

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

  379.  */

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

  381.                               int a_avail, int c_avail,

  382.                               int16_t **dc_val_ptr, int *dir_ptr)

  383. {

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

  385.     int16_t *dc_val;

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

  387.     int q1, q2 = 0;

  388.     int dqscale_index;

  389. 

  390.     /* scale predictors if needed */

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

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

  393.     if (dqscale_index < 0)

  394.         return 0;

  395. 

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

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

  398. 

  399.     /* B A

  400.      * C X

  401.      */

  402.     c = dc_val[ - 1];

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

  404.     a = dc_val[ - wrap];

  405. 

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

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

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

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

  410.     }

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

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

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

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

  415.     }

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

  417.         int off = mb_pos;

  418.         if (n != 1)

  419.             off--;

  420.         if (n != 2)

  421.             off -= s->mb_stride;

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

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

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

  425.     }

  426. 

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

  428.         pred     = c;

  429.         *dir_ptr = 1; // left

  430.     } else if (a_avail) {

  431.         pred     = a;

  432.         *dir_ptr = 0; // top

  433.     } else {

  434.         pred     = 0;

  435.         *dir_ptr = 1; // left

  436.     }

  437. 

  438.     /* update predictor */

  439.     *dc_val_ptr = &dc_val[0];

  440.     return pred;

  441. }

  442. 

  443. /** @} */ // Block group

  444. 

  445. /**

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

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

  448.  * @{

  449.  */

  450. 

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

  452.                                        uint8_t **coded_block_ptr)

  453. {

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

  455. 

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

  457.     wrap = s->b8_stride;

  458. 

  459.     /* B C

  460.      * A X

  461.      */

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

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

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

  465. 

  466.     if (b == c) {

  467.         pred = a;

  468.     } else {

  469.         pred = c;

  470.     }

  471. 

  472.     /* store value */

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

  474. 

  475.     return pred;

  476. }

  477. 

  478. /**

  479.  * Decode one AC coefficient

  480.  * @param v The VC1 context

  481.  * @param last Last coefficient

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

  483.  * @param value Decoded AC coefficient value

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

  485.  * @see 8.1.3.4

  486.  */

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

  488.                                 int *value, int codingset)

  489. {

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

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

  492. 

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

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

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

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

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

  498.         sign  = get_bits1(gb);

  499.     } else {

  500.         int escape = decode210(gb);

  501.         if (escape != 2) {

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

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

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

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

  506.             if (escape == 0) {

  507.                 if (lst)

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

  509.                 else

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

  511.             } else {

  512.                 if (lst)

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

  514.                 else

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

  516.             }

  517.             sign = get_bits1(gb);

  518.         } else {

  519.             lst = get_bits1(gb);

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

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

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

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

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

  525.                 } else { // table 60

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

  527.                 }

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

  529.             }

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

  531.             sign  = get_bits1(gb);

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

  533.         }

  534.     }

  535. 

  536.     *last  = lst;

  537.     *skip  = run;

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

  539. }

  540. 

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

  542.  * @param v VC1Context

  543.  * @param block block to decode

  544.  * @param[in] n subblock index

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

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

  547.  */

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

  549.                               int coded, int codingset)

  550. {

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

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

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

  554.     int i;

  555.     int16_t *dc_val;

  556.     int16_t *ac_val, *ac_val2;

  557.     int dcdiff, scale;

  558. 

  559.     /* Get DC differential */

  560.     if (n < 4) {

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

  562.     } else {

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

  564.     }

  565.     if (dcdiff < 0) {

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

  567.         return -1;

  568.     }

  569.     if (dcdiff) {

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

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

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

  573.         } else {

  574.             if (m)

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

  576.         }

  577.         if (get_bits1(gb))

  578.             dcdiff = -dcdiff;

  579.     }

  580. 

  581.     /* Prediction */

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

  583.     *dc_val = dcdiff;

  584. 

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

  586.     if (n < 4)

  587.         scale = s->y_dc_scale;

  588.     else

  589.         scale = s->c_dc_scale;

  590.     block[0] = dcdiff * scale;

  591. 

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

  593.     ac_val2 = ac_val;

  594.     if (dc_pred_dir) // left

  595.         ac_val -= 16;

  596.     else // top

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

  598. 

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

  600. 

  601.     //AC Decoding

  602.     i = !!coded;

  603. 

  604.     if (coded) {

  605.         int last = 0, skip, value;

  606.         const uint8_t *zz_table;

  607.         int k;

  608. 

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

  610.             if (!dc_pred_dir)

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

  612.             else

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

  614.         } else

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

  616. 

  617.         while (!last) {

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

  619.             i += skip;

  620.             if (i > 63)

  621.                 break;

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

  623.         }

  624. 

  625.         /* apply AC prediction if needed */

  626.         if (s->ac_pred) {

  627.             int sh;

  628.             if (dc_pred_dir) { // left

  629.                 sh = v->left_blk_sh;

  630.             } else { // top

  631.                 sh = v->top_blk_sh;

  632.                 ac_val += 8;

  633.             }

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

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

  636.         }

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

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

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

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

  641.         }

  642. 

  643.         /* scale AC coeffs */

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

  645.             if (block[k]) {

  646.                 block[k] *= scale;

  647.                 if (!v->pquantizer)

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

  649.             }

  650. 

  651.     } else {

  652.         int k;

  653. 

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

  655. 

  656.         /* apply AC prediction if needed */

  657.         if (s->ac_pred) {

  658.             int sh;

  659.             if (dc_pred_dir) { //left

  660.                 sh = v->left_blk_sh;

  661.             } else { // top

  662.                 sh = v->top_blk_sh;

  663.                 ac_val  += 8;

  664.                 ac_val2 += 8;

  665.             }

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

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

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

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

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

  671.             }

  672.         }

  673.     }

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

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

  676. 

  677.     return 0;

  678. }

  679. 

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

  681.  * @param v VC1Context

  682.  * @param block block to decode

  683.  * @param[in] n subblock number

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

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

  686.  * @param mquant quantizer value for this macroblock

  687.  */

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

  689.                                   int coded, int codingset, int mquant)

  690. {

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

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

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

  694.     int i;

  695.     int16_t *dc_val = NULL;

  696.     int16_t *ac_val, *ac_val2;

  697.     int dcdiff;

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

  699.     int use_pred = s->ac_pred;

  700.     int scale;

  701.     int q1, q2 = 0;

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

  703. 

  704.     /* Get DC differential */

  705.     if (n < 4) {

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

  707.     } else {

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

  709.     }

  710.     if (dcdiff < 0) {

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

  712.         return -1;

  713.     }

  714.     if (dcdiff) {

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

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

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

  718.         } else {

  719.             if (m)

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

  721.         }

  722.         if (get_bits1(gb))

  723.             dcdiff = -dcdiff;

  724.     }

  725. 

  726.     /* Prediction */

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

  728.     *dc_val = dcdiff;

  729. 

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

  731.     if (n < 4)

  732.         scale = s->y_dc_scale;

  733.     else

  734.         scale = s->c_dc_scale;

  735.     block[0] = dcdiff * scale;

  736. 

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

  738.     if (!a_avail && !c_avail)

  739.         use_pred = 0;

  740. 

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

  742. 

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

  744.     ac_val2 = ac_val;

  745.     if (dc_pred_dir) // left

  746.         ac_val -= 16;

  747.     else // top

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

  749. 

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

  751.     if (n == 3)

  752.         q2 = q1;

  753.     else if (dc_pred_dir) {

  754.         if (n == 1)

  755.             q2 = q1;

  756.         else if (c_avail && mb_pos)

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

  758.     } else {

  759.         if (n == 2)

  760.             q2 = q1;

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

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

  763.     }

  764. 

  765.     //AC Decoding

  766.     i = 1;

  767. 

  768.     if (coded) {

  769.         int last = 0, skip, value;

  770.         const uint8_t *zz_table;

  771.         int k;

  772. 

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

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

  775.                 zz_table = v->zzi_8x8;

  776.             } else {

  777.                 if (!dc_pred_dir) // top

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

  779.                 else // left

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

  781.             }

  782.         } else {

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

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

  785.             else

  786.                 zz_table = v->zzi_8x8;

  787.         }

  788. 

  789.         while (!last) {

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

  791.             i += skip;

  792.             if (i > 63)

  793.                 break;

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

  795.         }

  796. 

  797.         /* apply AC prediction if needed */

  798.         if (use_pred) {

  799.             int sh;

  800.             if (dc_pred_dir) { // left

  801.                 sh = v->left_blk_sh;

  802.             } else { // top

  803.                 sh = v->top_blk_sh;

  804.                 ac_val += 8;

  805.             }

  806.             /* scale predictors if needed*/

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

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

  809.                 if (q1 < 1)

  810.                     return AVERROR_INVALIDDATA;

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

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

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

  814.             } else {

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

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

  817.             }

  818.         }

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

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

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

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

  823.         }

  824. 

  825.         /* scale AC coeffs */

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

  827.             if (block[k]) {

  828.                 block[k] *= scale;

  829.                 if (!v->pquantizer)

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

  831.             }

  832. 

  833.     } else { // no AC coeffs

  834.         int k;

  835. 

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

  837. 

  838.         /* apply AC prediction if needed */

  839.         if (use_pred) {

  840.             int sh;

  841.             if (dc_pred_dir) { // left

  842.                 sh = v->left_blk_sh;

  843.             } else { // top

  844.                 sh = v->top_blk_sh;

  845.                 ac_val  += 8;

  846.                 ac_val2 += 8;

  847.             }

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

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

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

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

  852.                 if (q1 < 1)

  853.                     return AVERROR_INVALIDDATA;

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

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

  856.             }

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

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

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

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

  861.             }

  862.         }

  863.     }

  864.     if (use_pred) i = 63;

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

  866. 

  867.     return 0;

  868. }

  869. 

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

  871.  * @param v VC1Context

  872.  * @param block block to decode

  873.  * @param[in] n subblock index

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

  875.  * @param mquant block quantizer

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

  877.  */

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

  879.                                   int coded, int mquant, int codingset)

  880. {

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

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

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

  884.     int i;

  885.     int16_t *dc_val = NULL;

  886.     int16_t *ac_val, *ac_val2;

  887.     int dcdiff;

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

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

  890.     int use_pred = s->ac_pred;

  891.     int scale;

  892.     int q1, q2 = 0;

  893. 

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

  895. 

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

  897.     mquant = av_clip_uintp2(mquant, 5);

  898. 

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

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

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

  902. 

  903.     /* Get DC differential */

  904.     if (n < 4) {

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

  906.     } else {

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

  908.     }

  909.     if (dcdiff < 0) {

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

  911.         return -1;

  912.     }

  913.     if (dcdiff) {

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

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

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

  917.         } else {

  918.             if (m)

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

  920.         }

  921.         if (get_bits1(gb))

  922.             dcdiff = -dcdiff;

  923.     }

  924. 

  925.     /* Prediction */

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

  927.     *dc_val = dcdiff;

  928. 

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

  930. 

  931.     if (n < 4) {

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

  933.     } else {

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

  935.     }

  936. 

  937.     //AC Decoding

  938.     i = 1;

  939. 

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

  941.     if (!a_avail) dc_pred_dir = 1;

  942.     if (!c_avail) dc_pred_dir = 0;

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

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

  945.     ac_val2 = ac_val;

  946. 

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

  948. 

  949.     if (dc_pred_dir) //left

  950.         ac_val -= 16;

  951.     else //top

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

  953. 

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

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

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

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

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

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

  960.         q2 = q1;

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

  962.         q2 = q1;

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

  964. 

  965.     if (coded) {

  966.         int last = 0, skip, value;

  967.         int k;

  968. 

  969.         while (!last) {

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

  971.             i += skip;

  972.             if (i > 63)

  973.                 break;

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

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

  976.             else {

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

  978.                     if (!dc_pred_dir) // top

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

  980.                     else // left

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

  982.                 } else {

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

  984.                 }

  985.             }

  986.         }

  987. 

  988.         /* apply AC prediction if needed */

  989.         if (use_pred) {

  990.             /* scale predictors if needed*/

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

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

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

  994. 

  995.                 if (q1 < 1)

  996.                     return AVERROR_INVALIDDATA;

  997.                 if (dc_pred_dir) { // left

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

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

  1000.                 } else { //top

  1001.                     for (k = 1; k < 8; k++)

  1002.                         block[k << v->top_blk_sh] += (ac_val[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1003.                 }

  1004.             } else {

  1005.                 if (dc_pred_dir) { // left

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

  1007.                         block[k << v->left_blk_sh] += ac_val[k];

  1008.                 } else { // top

  1009.                     for (k = 1; k < 8; k++)

  1010.                         block[k << v->top_blk_sh] += ac_val[k + 8];

  1011.                 }

  1012.             }

  1013.         }

  1014.         /* save AC coeffs for further prediction */

  1015.         for (k = 1; k < 8; k++) {

  1016.             ac_val2[k    ] = block[k << v->left_blk_sh];

  1017.             ac_val2[k + 8] = block[k << v->top_blk_sh];

  1018.         }

  1019. 

  1020.         /* scale AC coeffs */

  1021.         for (k = 1; k < 64; k++)

  1022.             if (block[k]) {

  1023.                 block[k] *= scale;

  1024.                 if (!v->pquantizer)

  1025.                     block[k] += (block[k] < 0) ? -mquant : mquant;

  1026.             }

  1027. 

  1028.         if (use_pred) i = 63;

  1029.     } else { // no AC coeffs

  1030.         int k;

  1031. 

  1032.         memset(ac_val2, 0, 16 * 2);

  1033.         if (dc_pred_dir) { // left

  1034.             if (use_pred) {

  1035.                 memcpy(ac_val2, ac_val, 8 * 2);

  1036.                 if (q2 && q1 != q2) {

  1037.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  1038.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  1039.                     if (q1 < 1)

  1040.                         return AVERROR_INVALIDDATA;

  1041.                     for (k = 1; k < 8; k++)

  1042.                         ac_val2[k] = (ac_val2[k] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1043.                 }

  1044.             }

  1045.         } else { // top

  1046.             if (use_pred) {

  1047.                 memcpy(ac_val2 + 8, ac_val + 8, 8 * 2);

  1048.                 if (q2 && q1 != q2) {

  1049.                     q1 = q1 * 2 + ((q1 == v->pq) ? v->halfpq : 0) - 1;

  1050.                     q2 = q2 * 2 + ((q2 == v->pq) ? v->halfpq : 0) - 1;

  1051.                     if (q1 < 1)

  1052.                         return AVERROR_INVALIDDATA;

  1053.                     for (k = 1; k < 8; k++)

  1054.                         ac_val2[k + 8] = (ac_val2[k + 8] * q2 * ff_vc1_dqscale[q1 - 1] + 0x20000) >> 18;

  1055.                 }

  1056.             }

  1057.         }

  1058. 

  1059.         /* apply AC prediction if needed */

  1060.         if (use_pred) {

  1061.             if (dc_pred_dir) { // left

  1062.                 for (k = 1; k < 8; k++) {

  1063.                     block[k << v->left_blk_sh] = ac_val2[k] * scale;

  1064.                     if (!v->pquantizer && block[k << v->left_blk_sh])

  1065.                         block[k << v->left_blk_sh] += (block[k << v->left_blk_sh] < 0) ? -mquant : mquant;

  1066.                 }

  1067.             } else { // top

  1068.                 for (k = 1; k < 8; k++) {

  1069.                     block[k << v->top_blk_sh] = ac_val2[k + 8] * scale;

  1070.                     if (!v->pquantizer && block[k << v->top_blk_sh])

  1071.                         block[k << v->top_blk_sh] += (block[k << v->top_blk_sh] < 0) ? -mquant : mquant;

  1072.                 }

  1073.             }

  1074.             i = 63;

  1075.         }

  1076.     }

  1077.     s->block_last_index[n] = i;

  1078. 

  1079.     return 0;

  1080. }

  1081. 

  1082. /** Decode P block

  1083.  */

  1084. static int vc1_decode_p_block(VC1Context *v, int16_t block[64], int n,

  1085.                               int mquant, int ttmb, int first_block,

  1086.                               uint8_t *dst, int linesize, int skip_block,

  1087.                               int *ttmb_out)

  1088. {

  1089.     MpegEncContext *s = &v->s;

  1090.     GetBitContext *gb = &s->gb;

  1091.     int i, j;

  1092.     int subblkpat = 0;

  1093.     int scale, off, idx, last, skip, value;

  1094.     int ttblk = ttmb & 7;

  1095.     int pat = 0;

  1096. 

  1097.     s->bdsp.clear_block(block);

  1098. 

  1099.     if (ttmb == -1) {

  1100.         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)];

  1101.     }

  1102.     if (ttblk == TT_4X4) {

  1103.         subblkpat = ~(get_vlc2(gb, ff_vc1_subblkpat_vlc[v->tt_index].table, VC1_SUBBLKPAT_VLC_BITS, 1) + 1);

  1104.     }

  1105.     if ((ttblk != TT_8X8 && ttblk != TT_4X4)

  1106.         && ((v->ttmbf || (ttmb != -1 && (ttmb & 8) && !first_block))

  1107.             || (!v->res_rtm_flag && !first_block))) {

  1108.         subblkpat = decode012(gb);

  1109.         if (subblkpat)

  1110.             subblkpat ^= 3; // swap decoded pattern bits

  1111.         if (ttblk == TT_8X4_TOP || ttblk == TT_8X4_BOTTOM)

  1112.             ttblk = TT_8X4;

  1113.         if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT)

  1114.             ttblk = TT_4X8;

  1115.     }

  1116.     scale = 2 * mquant + ((v->pq == mquant) ? v->halfpq : 0);

  1117. 

  1118.     // convert transforms like 8X4_TOP to generic TT and SUBBLKPAT

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

  1120.         subblkpat = 2 - (ttblk == TT_8X4_TOP);

  1121.         ttblk     = TT_8X4;

  1122.     }

  1123.     if (ttblk == TT_4X8_RIGHT || ttblk == TT_4X8_LEFT) {

  1124.         subblkpat = 2 - (ttblk == TT_4X8_LEFT);

  1125.         ttblk     = TT_4X8;

  1126.     }

  1127.     switch (ttblk) {

  1128.     case TT_8X8:

  1129.         pat  = 0xF;

  1130.         i    = 0;

  1131.         last = 0;

  1132.         while (!last) {

  1133.             vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  1134.             i += skip;

  1135.             if (i > 63)

  1136.                 break;

  1137.             if (!v->fcm)

  1138.                 idx = v->zz_8x8[0][i++];

  1139.             else

  1140.                 idx = v->zzi_8x8[i++];

  1141.             block[idx] = value * scale;

  1142.             if (!v->pquantizer)

  1143.                 block[idx] += (block[idx] < 0) ? -mquant : mquant;

  1144.         }

  1145.         if (!skip_block) {

  1146.             if (i == 1)

  1147.                 v->vc1dsp.vc1_inv_trans_8x8_dc(dst, linesize, block);

  1148.             else {

  1149.                 v->vc1dsp.vc1_inv_trans_8x8(block);

  1150.                 s->idsp.add_pixels_clamped(block, dst, linesize);

  1151.             }

  1152.         }

  1153.         break;

  1154.     case TT_4X4:

  1155.         pat = ~subblkpat & 0xF;

  1156.         for (j = 0; j < 4; j++) {

  1157.             last = subblkpat & (1 << (3 - j));

  1158.             i    = 0;

  1159.             off  = (j & 1) * 4 + (j & 2) * 16;

  1160.             while (!last) {

  1161.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  1162.                 i += skip;

  1163.                 if (i > 15)

  1164.                     break;

  1165.                 if (!v->fcm)

  1166.                     idx = ff_vc1_simple_progressive_4x4_zz[i++];

  1167.                 else

  1168.                     idx = ff_vc1_adv_interlaced_4x4_zz[i++];

  1169.                 block[idx + off] = value * scale;

  1170.                 if (!v->pquantizer)

  1171.                     block[idx + off] += (block[idx + off] < 0) ? -mquant : mquant;

  1172.             }

  1173.             if (!(subblkpat & (1 << (3 - j))) && !skip_block) {

  1174.                 if (i == 1)

  1175.                     v->vc1dsp.vc1_inv_trans_4x4_dc(dst + (j & 1) * 4 + (j & 2) * 2 * linesize, linesize, block + off);

  1176.                 else

  1177.                     v->vc1dsp.vc1_inv_trans_4x4(dst + (j & 1) * 4 + (j & 2) *  2 * linesize, linesize, block + off);

  1178.             }

  1179.         }

  1180.         break;

  1181.     case TT_8X4:

  1182.         pat = ~((subblkpat & 2) * 6 + (subblkpat & 1) * 3) & 0xF;

  1183.         for (j = 0; j < 2; j++) {

  1184.             last = subblkpat & (1 << (1 - j));

  1185.             i    = 0;

  1186.             off  = j * 32;

  1187.             while (!last) {

  1188.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  1189.                 i += skip;

  1190.                 if (i > 31)

  1191.                     break;

  1192.                 if (!v->fcm)

  1193.                     idx = v->zz_8x4[i++] + off;

  1194.                 else

  1195.                     idx = ff_vc1_adv_interlaced_8x4_zz[i++] + off;

  1196.                 block[idx] = value * scale;

  1197.                 if (!v->pquantizer)

  1198.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  1199.             }

  1200.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  1201.                 if (i == 1)

  1202.                     v->vc1dsp.vc1_inv_trans_8x4_dc(dst + j * 4 * linesize, linesize, block + off);

  1203.                 else

  1204.                     v->vc1dsp.vc1_inv_trans_8x4(dst + j * 4 * linesize, linesize, block + off);

  1205.             }

  1206.         }

  1207.         break;

  1208.     case TT_4X8:

  1209.         pat = ~(subblkpat * 5) & 0xF;

  1210.         for (j = 0; j < 2; j++) {

  1211.             last = subblkpat & (1 << (1 - j));

  1212.             i    = 0;

  1213.             off  = j * 4;

  1214.             while (!last) {

  1215.                 vc1_decode_ac_coeff(v, &last, &skip, &value, v->codingset2);

  1216.                 i += skip;

  1217.                 if (i > 31)

  1218.                     break;

  1219.                 if (!v->fcm)

  1220.                     idx = v->zz_4x8[i++] + off;

  1221.                 else

  1222.                     idx = ff_vc1_adv_interlaced_4x8_zz[i++] + off;

  1223.                 block[idx] = value * scale;

  1224.                 if (!v->pquantizer)

  1225.                     block[idx] += (block[idx] < 0) ? -mquant : mquant;

  1226.             }

  1227.             if (!(subblkpat & (1 << (1 - j))) && !skip_block) {

  1228.                 if (i == 1)

  1229.                     v->vc1dsp.vc1_inv_trans_4x8_dc(dst + j * 4, linesize, block + off);

  1230.                 else

  1231.                     v->vc1dsp.vc1_inv_trans_4x8(dst + j*4, linesize, block + off);

  1232.             }

  1233.         }

  1234.         break;

  1235.     }

  1236.     if (ttmb_out)

  1237.         *ttmb_out |= ttblk << (n * 4);

  1238.     return pat;

  1239. }

  1240. 

  1241. /** @} */ // Macroblock group

  1242. 

  1243. static const uint8_t size_table[6] = { 0, 2, 3, 4,  5,  8 };

  1244. 

  1245. /** Decode one P-frame MB

  1246.  */

  1247. static int vc1_decode_p_mb(VC1Context *v)

  1248. {

  1249.     MpegEncContext *s = &v->s;

  1250.     GetBitContext *gb = &s->gb;

  1251.     int i, j;

  1252.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1253.     int cbp; /* cbp decoding stuff */

  1254.     int mqdiff, mquant; /* MB quantization */

  1255.     int ttmb = v->ttfrm; /* MB Transform type */

  1256. 

  1257.     int mb_has_coeffs = 1; /* last_flag */

  1258.     int dmv_x, dmv_y; /* Differential MV components */

  1259.     int index, index1; /* LUT indexes */

  1260.     int val, sign; /* temp values */

  1261.     int first_block = 1;

  1262.     int dst_idx, off;

  1263.     int skipped, fourmv;

  1264.     int block_cbp = 0, pat, block_tt = 0, block_intra = 0;

  1265. 

  1266.     mquant = v->pq; /* lossy initialization */

  1267. 

  1268.     if (v->mv_type_is_raw)

  1269.         fourmv = get_bits1(gb);

  1270.     else

  1271.         fourmv = v->mv_type_mb_plane[mb_pos];

  1272.     if (v->skip_is_raw)

  1273.         skipped = get_bits1(gb);

  1274.     else

  1275.         skipped = v->s.mbskip_table[mb_pos];

  1276. 

  1277.     if (!fourmv) { /* 1MV mode */

  1278.         if (!skipped) {

  1279.             GET_MVDATA(dmv_x, dmv_y);

  1280. 

  1281.             if (s->mb_intra) {

  1282.                 s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  1283.                 s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  1284.             }

  1285.             s->current_picture.mb_type[mb_pos] = s->mb_intra ? MB_TYPE_INTRA : MB_TYPE_16x16;

  1286.             ff_vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  1287. 

  1288.             /* FIXME Set DC val for inter block ? */

  1289.             if (s->mb_intra && !mb_has_coeffs) {

  1290.                 GET_MQUANT();

  1291.                 s->ac_pred = get_bits1(gb);

  1292.                 cbp        = 0;

  1293.             } else if (mb_has_coeffs) {

  1294.                 if (s->mb_intra)

  1295.                     s->ac_pred = get_bits1(gb);

  1296.                 cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1297.                 GET_MQUANT();

  1298.             } else {

  1299.                 mquant = v->pq;

  1300.                 cbp    = 0;

  1301.             }

  1302.             s->current_picture.qscale_table[mb_pos] = mquant;

  1303. 

  1304.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  1305.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table,

  1306.                                 VC1_TTMB_VLC_BITS, 2);

  1307.             if (!s->mb_intra) ff_vc1_mc_1mv(v, 0);

  1308.             dst_idx = 0;

  1309.             for (i = 0; i < 6; i++) {

  1310.                 s->dc_val[0][s->block_index[i]] = 0;

  1311.                 dst_idx += i >> 2;

  1312.                 val = ((cbp >> (5 - i)) & 1);

  1313.                 off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1314.                 v->mb_type[0][s->block_index[i]] = s->mb_intra;

  1315.                 if (s->mb_intra) {

  1316.                     /* check if prediction blocks A and C are available */

  1317.                     v->a_avail = v->c_avail = 0;

  1318.                     if (i == 2 || i == 3 || !s->first_slice_line)

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

  1320.                     if (i == 1 || i == 3 || s->mb_x)

  1321.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1322. 

  1323.                     vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,

  1324.                                            (i & 4) ? v->codingset2 : v->codingset);

  1325.                     if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  1326.                         continue;

  1327.                     v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);

  1328.                     if (v->rangeredfrm)

  1329.                         for (j = 0; j < 64; j++)

  1330.                             v->block[v->cur_blk_idx][i][j] <<= 1;

  1331.                     block_cbp   |= 0xF << (i << 2);

  1332.                     block_intra |= 1 << i;

  1333.                 } else if (val) {

  1334.                     pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb, first_block,

  1335.                                              s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize,

  1336.                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);

  1337.                     block_cbp |= pat << (i << 2);

  1338.                     if (!v->ttmbf && ttmb < 8)

  1339.                         ttmb = -1;

  1340.                     first_block = 0;

  1341.                 }

  1342.             }

  1343.         } else { // skipped

  1344.             s->mb_intra = 0;

  1345.             for (i = 0; i < 6; i++) {

  1346.                 v->mb_type[0][s->block_index[i]] = 0;

  1347.                 s->dc_val[0][s->block_index[i]]  = 0;

  1348.             }

  1349.             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  1350.             s->current_picture.qscale_table[mb_pos] = 0;

  1351.             ff_vc1_pred_mv(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  1352.             ff_vc1_mc_1mv(v, 0);

  1353.         }

  1354.     } else { // 4MV mode

  1355.         if (!skipped /* unskipped MB */) {

  1356.             int intra_count = 0, coded_inter = 0;

  1357.             int is_intra[6], is_coded[6];

  1358.             /* Get CBPCY */

  1359.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

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

  1361.                 val = ((cbp >> (5 - i)) & 1);

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

  1363.                 s->mb_intra                     = 0;

  1364.                 if (i < 4) {

  1365.                     dmv_x = dmv_y = 0;

  1366.                     s->mb_intra   = 0;

  1367.                     mb_has_coeffs = 0;

  1368.                     if (val) {

  1369.                         GET_MVDATA(dmv_x, dmv_y);

  1370.                     }

  1371.                     ff_vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  1372.                     if (!s->mb_intra)

  1373.                         ff_vc1_mc_4mv_luma(v, i, 0, 0);

  1374.                     intra_count += s->mb_intra;

  1375.                     is_intra[i]  = s->mb_intra;

  1376.                     is_coded[i]  = mb_has_coeffs;

  1377.                 }

  1378.                 if (i & 4) {

  1379.                     is_intra[i] = (intra_count >= 3);

  1380.                     is_coded[i] = val;

  1381.                 }

  1382.                 if (i == 4)

  1383.                     ff_vc1_mc_4mv_chroma(v, 0);

  1384.                 v->mb_type[0][s->block_index[i]] = is_intra[i];

  1385.                 if (!coded_inter)

  1386.                     coded_inter = !is_intra[i] & is_coded[i];

  1387.             }

  1388.             // if there are no coded blocks then don't do anything more

  1389.             dst_idx = 0;

  1390.             if (!intra_count && !coded_inter)

  1391.                 goto end;

  1392.             GET_MQUANT();

  1393.             s->current_picture.qscale_table[mb_pos] = mquant;

  1394.             /* test if block is intra and has pred */

  1395.             {

  1396.                 int intrapred = 0;

  1397.                 for (i = 0; i < 6; i++)

  1398.                     if (is_intra[i]) {

  1399.                         if (((!s->first_slice_line || (i == 2 || i == 3)) && v->mb_type[0][s->block_index[i] - s->block_wrap[i]])

  1400.                             || ((s->mb_x || (i == 1 || i == 3)) && v->mb_type[0][s->block_index[i] - 1])) {

  1401.                             intrapred = 1;

  1402.                             break;

  1403.                         }

  1404.                     }

  1405.                 if (intrapred)

  1406.                     s->ac_pred = get_bits1(gb);

  1407.                 else

  1408.                     s->ac_pred = 0;

  1409.             }

  1410.             if (!v->ttmbf && coded_inter)

  1411.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

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

  1413.                 dst_idx    += i >> 2;

  1414.                 off         = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1415.                 s->mb_intra = is_intra[i];

  1416.                 if (is_intra[i]) {

  1417.                     /* check if prediction blocks A and C are available */

  1418.                     v->a_avail = v->c_avail = 0;

  1419.                     if (i == 2 || i == 3 || !s->first_slice_line)

  1420.                         v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1421.                     if (i == 1 || i == 3 || s->mb_x)

  1422.                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1423. 

  1424.                     vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, is_coded[i], mquant,

  1425.                                            (i & 4) ? v->codingset2 : v->codingset);

  1426.                     if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  1427.                         continue;

  1428.                     v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);

  1429.                     if (v->rangeredfrm)

  1430.                         for (j = 0; j < 64; j++)

  1431.                             v->block[v->cur_blk_idx][i][j] <<= 1;

  1432.                     block_cbp   |= 0xF << (i << 2);

  1433.                     block_intra |= 1 << i;

  1434.                 } else if (is_coded[i]) {

  1435.                     pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,

  1436.                                              first_block, s->dest[dst_idx] + off,

  1437.                                              (i & 4) ? s->uvlinesize : s->linesize,

  1438.                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY),

  1439.                                              &block_tt);

  1440.                     block_cbp |= pat << (i << 2);

  1441.                     if (!v->ttmbf && ttmb < 8)

  1442.                         ttmb = -1;

  1443.                     first_block = 0;

  1444.                 }

  1445.             }

  1446.         } else { // skipped MB

  1447.             s->mb_intra                               = 0;

  1448.             s->current_picture.qscale_table[mb_pos] = 0;

  1449.             for (i = 0; i < 6; i++) {

  1450.                 v->mb_type[0][s->block_index[i]] = 0;

  1451.                 s->dc_val[0][s->block_index[i]]  = 0;

  1452.             }

  1453.             for (i = 0; i < 4; i++) {

  1454.                 ff_vc1_pred_mv(v, i, 0, 0, 0, v->range_x, v->range_y, v->mb_type[0], 0, 0);

  1455.                 ff_vc1_mc_4mv_luma(v, i, 0, 0);

  1456.             }

  1457.             ff_vc1_mc_4mv_chroma(v, 0);

  1458.             s->current_picture.qscale_table[mb_pos] = 0;

  1459.         }

  1460.     }

  1461. end:

  1462.     if (v->overlap && v->pq >= 9)

  1463.         ff_vc1_p_overlap_filter(v);

  1464.     vc1_put_signed_blocks_clamped(v);

  1465. 

  1466.     v->cbp[s->mb_x]      = block_cbp;

  1467.     v->ttblk[s->mb_x]    = block_tt;

  1468.     v->is_intra[s->mb_x] = block_intra;

  1469. 

  1470.     return 0;

  1471. }

  1472. 

  1473. /* Decode one macroblock in an interlaced frame p picture */

  1474. 

  1475. static int vc1_decode_p_mb_intfr(VC1Context *v)

  1476. {

  1477.     MpegEncContext *s = &v->s;

  1478.     GetBitContext *gb = &s->gb;

  1479.     int i;

  1480.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1481.     int cbp = 0; /* cbp decoding stuff */

  1482.     int mqdiff, mquant; /* MB quantization */

  1483.     int ttmb = v->ttfrm; /* MB Transform type */

  1484. 

  1485.     int mb_has_coeffs = 1; /* last_flag */

  1486.     int dmv_x, dmv_y; /* Differential MV components */

  1487.     int val; /* temp value */

  1488.     int first_block = 1;

  1489.     int dst_idx, off;

  1490.     int skipped, fourmv = 0, twomv = 0;

  1491.     int block_cbp = 0, pat, block_tt = 0;

  1492.     int idx_mbmode = 0, mvbp;

  1493.     int fieldtx;

  1494. 

  1495.     mquant = v->pq; /* Lossy initialization */

  1496. 

  1497.     if (v->skip_is_raw)

  1498.         skipped = get_bits1(gb);

  1499.     else

  1500.         skipped = v->s.mbskip_table[mb_pos];

  1501.     if (!skipped) {

  1502.         if (v->fourmvswitch)

  1503.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_4MV_MBMODE_VLC_BITS, 2); // try getting this done

  1504.         else

  1505.             idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2); // in a single line

  1506.         switch (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0]) {

  1507.         /* store the motion vector type in a flag (useful later) */

  1508.         case MV_PMODE_INTFR_4MV:

  1509.             fourmv = 1;

  1510.             v->blk_mv_type[s->block_index[0]] = 0;

  1511.             v->blk_mv_type[s->block_index[1]] = 0;

  1512.             v->blk_mv_type[s->block_index[2]] = 0;

  1513.             v->blk_mv_type[s->block_index[3]] = 0;

  1514.             break;

  1515.         case MV_PMODE_INTFR_4MV_FIELD:

  1516.             fourmv = 1;

  1517.             v->blk_mv_type[s->block_index[0]] = 1;

  1518.             v->blk_mv_type[s->block_index[1]] = 1;

  1519.             v->blk_mv_type[s->block_index[2]] = 1;

  1520.             v->blk_mv_type[s->block_index[3]] = 1;

  1521.             break;

  1522.         case MV_PMODE_INTFR_2MV_FIELD:

  1523.             twomv = 1;

  1524.             v->blk_mv_type[s->block_index[0]] = 1;

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

  1526.             v->blk_mv_type[s->block_index[2]] = 1;

  1527.             v->blk_mv_type[s->block_index[3]] = 1;

  1528.             break;

  1529.         case MV_PMODE_INTFR_1MV:

  1530.             v->blk_mv_type[s->block_index[0]] = 0;

  1531.             v->blk_mv_type[s->block_index[1]] = 0;

  1532.             v->blk_mv_type[s->block_index[2]] = 0;

  1533.             v->blk_mv_type[s->block_index[3]] = 0;

  1534.             break;

  1535.         }

  1536.         if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB

  1537.             for (i = 0; i < 4; i++) {

  1538.                 s->current_picture.motion_val[1][s->block_index[i]][0] = 0;

  1539.                 s->current_picture.motion_val[1][s->block_index[i]][1] = 0;

  1540.             }

  1541.             v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.

  1542.             s->mb_intra          = 1;

  1543.             s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  1544.             fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);

  1545.             mb_has_coeffs = get_bits1(gb);

  1546.             if (mb_has_coeffs)

  1547.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1548.             v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);

  1549.             GET_MQUANT();

  1550.             s->current_picture.qscale_table[mb_pos] = mquant;

  1551.             /* Set DC scale - y and c use the same (not sure if necessary here) */

  1552.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  1553.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  1554.             dst_idx = 0;

  1555.             for (i = 0; i < 6; i++) {

  1556.                 v->a_avail = v->c_avail          = 0;

  1557.                 v->mb_type[0][s->block_index[i]] = 1;

  1558.                 s->dc_val[0][s->block_index[i]]  = 0;

  1559.                 dst_idx += i >> 2;

  1560.                 val = ((cbp >> (5 - i)) & 1);

  1561.                 if (i == 2 || i == 3 || !s->first_slice_line)

  1562.                     v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1563.                 if (i == 1 || i == 3 || s->mb_x)

  1564.                     v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1565. 

  1566.                 vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,

  1567.                                        (i & 4) ? v->codingset2 : v->codingset);

  1568.                 if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  1569.                     continue;

  1570.                 v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);

  1571.                 if (i < 4)

  1572.                     off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;

  1573.                 else

  1574.                     off = 0;

  1575.                 block_cbp |= 0xf << (i << 2);

  1576.             }

  1577. 

  1578.         } else { // inter MB

  1579.             mb_has_coeffs = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][3];

  1580.             if (mb_has_coeffs)

  1581.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1582.             if (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {

  1583.                 v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);

  1584.             } else {

  1585.                 if ((ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV)

  1586.                     || (ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][0] == MV_PMODE_INTFR_4MV_FIELD)) {

  1587.                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  1588.                 }

  1589.             }

  1590.             s->mb_intra = v->is_intra[s->mb_x] = 0;

  1591.             for (i = 0; i < 6; i++)

  1592.                 v->mb_type[0][s->block_index[i]] = 0;

  1593.             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][1];

  1594.             /* for all motion vector read MVDATA and motion compensate each block */

  1595.             dst_idx = 0;

  1596.             if (fourmv) {

  1597.                 mvbp = v->fourmvbp;

  1598.                 for (i = 0; i < 4; i++) {

  1599.                     dmv_x = dmv_y = 0;

  1600.                     if (mvbp & (8 >> i))

  1601.                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  1602.                     ff_vc1_pred_mv_intfr(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], 0);

  1603.                     ff_vc1_mc_4mv_luma(v, i, 0, 0);

  1604.                 }

  1605.                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);

  1606.             } else if (twomv) {

  1607.                 mvbp  = v->twomvbp;

  1608.                 dmv_x = dmv_y = 0;

  1609.                 if (mvbp & 2) {

  1610.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  1611.                 }

  1612.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);

  1613.                 ff_vc1_mc_4mv_luma(v, 0, 0, 0);

  1614.                 ff_vc1_mc_4mv_luma(v, 1, 0, 0);

  1615.                 dmv_x = dmv_y = 0;

  1616.                 if (mvbp & 1) {

  1617.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  1618.                 }

  1619.                 ff_vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], 0);

  1620.                 ff_vc1_mc_4mv_luma(v, 2, 0, 0);

  1621.                 ff_vc1_mc_4mv_luma(v, 3, 0, 0);

  1622.                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);

  1623.             } else {

  1624.                 mvbp = ff_vc1_mbmode_intfrp[v->fourmvswitch][idx_mbmode][2];

  1625.                 dmv_x = dmv_y = 0;

  1626.                 if (mvbp) {

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

  1628.                 }

  1629.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  1630.                 ff_vc1_mc_1mv(v, 0);

  1631.             }

  1632.             if (cbp)

  1633.                 GET_MQUANT();  // p. 227

  1634.             s->current_picture.qscale_table[mb_pos] = mquant;

  1635.             if (!v->ttmbf && cbp)

  1636.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1637.             for (i = 0; i < 6; i++) {

  1638.                 s->dc_val[0][s->block_index[i]] = 0;

  1639.                 dst_idx += i >> 2;

  1640.                 val = ((cbp >> (5 - i)) & 1);

  1641.                 if (!fieldtx)

  1642.                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1643.                 else

  1644.                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));

  1645.                 if (val) {

  1646.                     pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,

  1647.                                              first_block, s->dest[dst_idx] + off,

  1648.                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),

  1649.                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);

  1650.                     block_cbp |= pat << (i << 2);

  1651.                     if (!v->ttmbf && ttmb < 8)

  1652.                         ttmb = -1;

  1653.                     first_block = 0;

  1654.                 }

  1655.             }

  1656.         }

  1657.     } else { // skipped

  1658.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  1659.         for (i = 0; i < 6; i++) {

  1660.             v->mb_type[0][s->block_index[i]] = 0;

  1661.             s->dc_val[0][s->block_index[i]] = 0;

  1662.         }

  1663.         s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  1664.         s->current_picture.qscale_table[mb_pos] = 0;

  1665.         v->blk_mv_type[s->block_index[0]] = 0;

  1666.         v->blk_mv_type[s->block_index[1]] = 0;

  1667.         v->blk_mv_type[s->block_index[2]] = 0;

  1668.         v->blk_mv_type[s->block_index[3]] = 0;

  1669.         ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  1670.         ff_vc1_mc_1mv(v, 0);

  1671.         v->fieldtx_plane[mb_pos] = 0;

  1672.     }

  1673.     if (v->overlap && v->pq >= 9)

  1674.         ff_vc1_p_overlap_filter(v);

  1675.     vc1_put_signed_blocks_clamped(v);

  1676. 

  1677.     v->cbp[s->mb_x]      = block_cbp;

  1678.     v->ttblk[s->mb_x]    = block_tt;

  1679. 

  1680.     return 0;

  1681. }

  1682. 

  1683. static int vc1_decode_p_mb_intfi(VC1Context *v)

  1684. {

  1685.     MpegEncContext *s = &v->s;

  1686.     GetBitContext *gb = &s->gb;

  1687.     int i;

  1688.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1689.     int cbp = 0; /* cbp decoding stuff */

  1690.     int mqdiff, mquant; /* MB quantization */

  1691.     int ttmb = v->ttfrm; /* MB Transform type */

  1692. 

  1693.     int mb_has_coeffs = 1; /* last_flag */

  1694.     int dmv_x, dmv_y; /* Differential MV components */

  1695.     int val; /* temp values */

  1696.     int first_block = 1;

  1697.     int dst_idx, off;

  1698.     int pred_flag = 0;

  1699.     int block_cbp = 0, pat, block_tt = 0;

  1700.     int idx_mbmode = 0;

  1701. 

  1702.     mquant = v->pq; /* Lossy initialization */

  1703. 

  1704.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  1705.     if (idx_mbmode <= 1) { // intra MB

  1706.         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.

  1707.         s->mb_intra          = 1;

  1708.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  1709.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  1710.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_INTRA;

  1711.         GET_MQUANT();

  1712.         s->current_picture.qscale_table[mb_pos] = mquant;

  1713.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  1714.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  1715.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  1716.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  1717.         mb_has_coeffs = idx_mbmode & 1;

  1718.         if (mb_has_coeffs)

  1719.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  1720.         dst_idx = 0;

  1721.         for (i = 0; i < 6; i++) {

  1722.             v->a_avail = v->c_avail          = 0;

  1723.             v->mb_type[0][s->block_index[i]] = 1;

  1724.             s->dc_val[0][s->block_index[i]]  = 0;

  1725.             dst_idx += i >> 2;

  1726.             val = ((cbp >> (5 - i)) & 1);

  1727.             if (i == 2 || i == 3 || !s->first_slice_line)

  1728.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1729.             if (i == 1 || i == 3 || s->mb_x)

  1730.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1731. 

  1732.             vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,

  1733.                                    (i & 4) ? v->codingset2 : v->codingset);

  1734.             if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  1735.                 continue;

  1736.             v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);

  1737.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1738.             block_cbp |= 0xf << (i << 2);

  1739.         }

  1740.     } else {

  1741.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  1742.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  1743.         for (i = 0; i < 6; i++)

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

  1745.         if (idx_mbmode <= 5) { // 1-MV

  1746.             dmv_x = dmv_y = pred_flag = 0;

  1747.             if (idx_mbmode & 1) {

  1748.                 get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  1749.             }

  1750.             ff_vc1_pred_mv(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  1751.             ff_vc1_mc_1mv(v, 0);

  1752.             mb_has_coeffs = !(idx_mbmode & 2);

  1753.         } else { // 4-MV

  1754.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  1755.             for (i = 0; i < 4; i++) {

  1756.                 dmv_x = dmv_y = pred_flag = 0;

  1757.                 if (v->fourmvbp & (8 >> i))

  1758.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, &pred_flag);

  1759.                 ff_vc1_pred_mv(v, i, dmv_x, dmv_y, 0, v->range_x, v->range_y, v->mb_type[0], pred_flag, 0);

  1760.                 ff_vc1_mc_4mv_luma(v, i, 0, 0);

  1761.             }

  1762.             ff_vc1_mc_4mv_chroma(v, 0);

  1763.             mb_has_coeffs = idx_mbmode & 1;

  1764.         }

  1765.         if (mb_has_coeffs)

  1766.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1767.         if (cbp) {

  1768.             GET_MQUANT();

  1769.         }

  1770.         s->current_picture.qscale_table[mb_pos] = mquant;

  1771.         if (!v->ttmbf && cbp) {

  1772.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1773.         }

  1774.         dst_idx = 0;

  1775.         for (i = 0; i < 6; i++) {

  1776.             s->dc_val[0][s->block_index[i]] = 0;

  1777.             dst_idx += i >> 2;

  1778.             val = ((cbp >> (5 - i)) & 1);

  1779.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  1780.             if (val) {

  1781.                 pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,

  1782.                                          first_block, s->dest[dst_idx] + off,

  1783.                                          (i & 4) ? s->uvlinesize : s->linesize,

  1784.                                          CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY),

  1785.                                          &block_tt);

  1786.                 block_cbp |= pat << (i << 2);

  1787.                 if (!v->ttmbf && ttmb < 8)

  1788.                     ttmb = -1;

  1789.                 first_block = 0;

  1790.             }

  1791.         }

  1792.     }

  1793.     if (v->overlap && v->pq >= 9)

  1794.         ff_vc1_p_overlap_filter(v);

  1795.     vc1_put_signed_blocks_clamped(v);

  1796. 

  1797.     v->cbp[s->mb_x]      = block_cbp;

  1798.     v->ttblk[s->mb_x]    = block_tt;

  1799. 

  1800.     return 0;

  1801. }

  1802. 

  1803. /** Decode one B-frame MB (in Main profile)

  1804.  */

  1805. static void vc1_decode_b_mb(VC1Context *v)

  1806. {

  1807.     MpegEncContext *s = &v->s;

  1808.     GetBitContext *gb = &s->gb;

  1809.     int i, j;

  1810.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1811.     int cbp = 0; /* cbp decoding stuff */

  1812.     int mqdiff, mquant; /* MB quantization */

  1813.     int ttmb = v->ttfrm; /* MB Transform type */

  1814.     int mb_has_coeffs = 0; /* last_flag */

  1815.     int index, index1; /* LUT indexes */

  1816.     int val, sign; /* temp values */

  1817.     int first_block = 1;

  1818.     int dst_idx, off;

  1819.     int skipped, direct;

  1820.     int dmv_x[2], dmv_y[2];

  1821.     int bmvtype = BMV_TYPE_BACKWARD;

  1822. 

  1823.     mquant      = v->pq; /* lossy initialization */

  1824.     s->mb_intra = 0;

  1825. 

  1826.     if (v->dmb_is_raw)

  1827.         direct = get_bits1(gb);

  1828.     else

  1829.         direct = v->direct_mb_plane[mb_pos];

  1830.     if (v->skip_is_raw)

  1831.         skipped = get_bits1(gb);

  1832.     else

  1833.         skipped = v->s.mbskip_table[mb_pos];

  1834. 

  1835.     dmv_x[0] = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  1836.     for (i = 0; i < 6; i++) {

  1837.         v->mb_type[0][s->block_index[i]] = 0;

  1838.         s->dc_val[0][s->block_index[i]]  = 0;

  1839.     }

  1840.     s->current_picture.qscale_table[mb_pos] = 0;

  1841. 

  1842.     if (!direct) {

  1843.         if (!skipped) {

  1844.             GET_MVDATA(dmv_x[0], dmv_y[0]);

  1845.             dmv_x[1] = dmv_x[0];

  1846.             dmv_y[1] = dmv_y[0];

  1847.         }

  1848.         if (skipped || !s->mb_intra) {

  1849.             bmvtype = decode012(gb);

  1850.             switch (bmvtype) {

  1851.             case 0:

  1852.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  1853.                 break;

  1854.             case 1:

  1855.                 bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  1856.                 break;

  1857.             case 2:

  1858.                 bmvtype  = BMV_TYPE_INTERPOLATED;

  1859.                 dmv_x[0] = dmv_y[0] = 0;

  1860.             }

  1861.         }

  1862.     }

  1863.     for (i = 0; i < 6; i++)

  1864.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  1865. 

  1866.     if (skipped) {

  1867.         if (direct)

  1868.             bmvtype = BMV_TYPE_INTERPOLATED;

  1869.         ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1870.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1871.         return;

  1872.     }

  1873.     if (direct) {

  1874.         cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1875.         GET_MQUANT();

  1876.         s->mb_intra = 0;

  1877.         s->current_picture.qscale_table[mb_pos] = mquant;

  1878.         if (!v->ttmbf)

  1879.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1880.         dmv_x[0] = dmv_y[0] = dmv_x[1] = dmv_y[1] = 0;

  1881.         ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1882.         vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1883.     } else {

  1884.         if (!mb_has_coeffs && !s->mb_intra) {

  1885.             /* no coded blocks - effectively skipped */

  1886.             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1887.             vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1888.             return;

  1889.         }

  1890.         if (s->mb_intra && !mb_has_coeffs) {

  1891.             GET_MQUANT();

  1892.             s->current_picture.qscale_table[mb_pos] = mquant;

  1893.             s->ac_pred = get_bits1(gb);

  1894.             cbp = 0;

  1895.             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1896.         } else {

  1897.             if (bmvtype == BMV_TYPE_INTERPOLATED) {

  1898.                 GET_MVDATA(dmv_x[0], dmv_y[0]);

  1899.                 if (!mb_has_coeffs) {

  1900.                     /* interpolated skipped block */

  1901.                     ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1902.                     vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1903.                     return;

  1904.                 }

  1905.             }

  1906.             ff_vc1_pred_b_mv(v, dmv_x, dmv_y, direct, bmvtype);

  1907.             if (!s->mb_intra) {

  1908.                 vc1_b_mc(v, dmv_x, dmv_y, direct, bmvtype);

  1909.             }

  1910.             if (s->mb_intra)

  1911.                 s->ac_pred = get_bits1(gb);

  1912.             cbp = get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  1913.             GET_MQUANT();

  1914.             s->current_picture.qscale_table[mb_pos] = mquant;

  1915.             if (!v->ttmbf && !s->mb_intra && mb_has_coeffs)

  1916.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  1917.         }

  1918.     }

  1919.     dst_idx = 0;

  1920.     for (i = 0; i < 6; i++) {

  1921.         s->dc_val[0][s->block_index[i]] = 0;

  1922.         dst_idx += i >> 2;

  1923.         val = ((cbp >> (5 - i)) & 1);

  1924.         off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  1925.         v->mb_type[0][s->block_index[i]] = s->mb_intra;

  1926.         if (s->mb_intra) {

  1927.             /* check if prediction blocks A and C are available */

  1928.             v->a_avail = v->c_avail = 0;

  1929.             if (i == 2 || i == 3 || !s->first_slice_line)

  1930.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  1931.             if (i == 1 || i == 3 || s->mb_x)

  1932.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  1933. 

  1934.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  1935.                                    (i & 4) ? v->codingset2 : v->codingset);

  1936.             if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  1937.                 continue;

  1938.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  1939.             if (v->rangeredfrm)

  1940.                 for (j = 0; j < 64; j++)

  1941.                     s->block[i][j] <<= 1;

  1942.             s->idsp.put_signed_pixels_clamped(s->block[i],

  1943.                                               s->dest[dst_idx] + off,

  1944.                                               i & 4 ? s->uvlinesize

  1945.                                                     : s->linesize);

  1946.         } else if (val) {

  1947.             vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  1948.                                first_block, s->dest[dst_idx] + off,

  1949.                                (i & 4) ? s->uvlinesize : s->linesize,

  1950.                                CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), NULL);

  1951.             if (!v->ttmbf && ttmb < 8)

  1952.                 ttmb = -1;

  1953.             first_block = 0;

  1954.         }

  1955.     }

  1956. }

  1957. 

  1958. /** Decode one B-frame MB (in interlaced field B picture)

  1959.  */

  1960. static void vc1_decode_b_mb_intfi(VC1Context *v)

  1961. {

  1962.     MpegEncContext *s = &v->s;

  1963.     GetBitContext *gb = &s->gb;

  1964.     int i, j;

  1965.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1966.     int cbp = 0; /* cbp decoding stuff */

  1967.     int mqdiff, mquant; /* MB quantization */

  1968.     int ttmb = v->ttfrm; /* MB Transform type */

  1969.     int mb_has_coeffs = 0; /* last_flag */

  1970.     int val; /* temp value */

  1971.     int first_block = 1;

  1972.     int dst_idx, off;

  1973.     int fwd;

  1974.     int dmv_x[2], dmv_y[2], pred_flag[2];

  1975.     int bmvtype = BMV_TYPE_BACKWARD;

  1976.     int block_cbp = 0, pat, block_tt = 0;

  1977.     int idx_mbmode;

  1978. 

  1979.     mquant      = v->pq; /* Lossy initialization */

  1980.     s->mb_intra = 0;

  1981. 

  1982.     idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_IF_MBMODE_VLC_BITS, 2);

  1983.     if (idx_mbmode <= 1) { // intra MB

  1984.         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.

  1985.         s->mb_intra          = 1;

  1986.         s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  1987.         s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  1988.         s->current_picture.mb_type[mb_pos + v->mb_off]         = MB_TYPE_INTRA;

  1989.         GET_MQUANT();

  1990.         s->current_picture.qscale_table[mb_pos] = mquant;

  1991.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  1992.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  1993.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  1994.         v->s.ac_pred  = v->acpred_plane[mb_pos] = get_bits1(gb);

  1995.         mb_has_coeffs = idx_mbmode & 1;

  1996.         if (mb_has_coeffs)

  1997.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_ICBPCY_VLC_BITS, 2);

  1998.         dst_idx = 0;

  1999.         for (i = 0; i < 6; i++) {

  2000.             v->a_avail = v->c_avail          = 0;

  2001.             v->mb_type[0][s->block_index[i]] = 1;

  2002.             s->dc_val[0][s->block_index[i]]  = 0;

  2003.             dst_idx += i >> 2;

  2004.             val = ((cbp >> (5 - i)) & 1);

  2005.             if (i == 2 || i == 3 || !s->first_slice_line)

  2006.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2007.             if (i == 1 || i == 3 || s->mb_x)

  2008.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2009. 

  2010.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  2011.                                    (i & 4) ? v->codingset2 : v->codingset);

  2012.             if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  2013.                 continue;

  2014.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  2015.             if (v->rangeredfrm)

  2016.                 for (j = 0; j < 64; j++)

  2017.                     s->block[i][j] <<= 1;

  2018.             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2019.             s->idsp.put_signed_pixels_clamped(s->block[i],

  2020.                                               s->dest[dst_idx] + off,

  2021.                                               (i & 4) ? s->uvlinesize

  2022.                                                       : s->linesize);

  2023.         }

  2024.     } else {

  2025.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  2026.         s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_16x16;

  2027.         for (i = 0; i < 6; i++)

  2028.             v->mb_type[0][s->block_index[i]] = 0;

  2029.         if (v->fmb_is_raw)

  2030.             fwd = v->forward_mb_plane[mb_pos] = get_bits1(gb);

  2031.         else

  2032.             fwd = v->forward_mb_plane[mb_pos];

  2033.         if (idx_mbmode <= 5) { // 1-MV

  2034.             int interpmvp = 0;

  2035.             dmv_x[0]     = dmv_x[1] = dmv_y[0] = dmv_y[1] = 0;

  2036.             pred_flag[0] = pred_flag[1] = 0;

  2037.             if (fwd)

  2038.                 bmvtype = BMV_TYPE_FORWARD;

  2039.             else {

  2040.                 bmvtype = decode012(gb);

  2041.                 switch (bmvtype) {

  2042.                 case 0:

  2043.                     bmvtype = BMV_TYPE_BACKWARD;

  2044.                     break;

  2045.                 case 1:

  2046.                     bmvtype = BMV_TYPE_DIRECT;

  2047.                     break;

  2048.                 case 2:

  2049.                     bmvtype   = BMV_TYPE_INTERPOLATED;

  2050.                     interpmvp = get_bits1(gb);

  2051.                 }

  2052.             }

  2053.             v->bmvtype = bmvtype;

  2054.             if (bmvtype != BMV_TYPE_DIRECT && idx_mbmode & 1) {

  2055.                 get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD], &dmv_y[bmvtype == BMV_TYPE_BACKWARD], &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  2056.             }

  2057.             if (interpmvp) {

  2058.                 get_mvdata_interlaced(v, &dmv_x[1], &dmv_y[1], &pred_flag[1]);

  2059.             }

  2060.             if (bmvtype == BMV_TYPE_DIRECT) {

  2061.                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  2062.                 dmv_x[1] = dmv_y[1] = pred_flag[0] = 0;

  2063.                 if (!s->next_picture_ptr->field_picture) {

  2064.                     av_log(s->avctx, AV_LOG_ERROR, "Mixed field/frame direct mode not supported\n");

  2065.                     return;

  2066.                 }

  2067.             }

  2068.             ff_vc1_pred_b_mv_intfi(v, 0, dmv_x, dmv_y, 1, pred_flag);

  2069.             vc1_b_mc(v, dmv_x, dmv_y, (bmvtype == BMV_TYPE_DIRECT), bmvtype);

  2070.             mb_has_coeffs = !(idx_mbmode & 2);

  2071.         } else { // 4-MV

  2072.             if (fwd)

  2073.                 bmvtype = BMV_TYPE_FORWARD;

  2074.             v->bmvtype  = bmvtype;

  2075.             v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  2076.             for (i = 0; i < 4; i++) {

  2077.                 dmv_x[0] = dmv_y[0] = pred_flag[0] = 0;

  2078.                 dmv_x[1] = dmv_y[1] = pred_flag[1] = 0;

  2079.                 if (v->fourmvbp & (8 >> i)) {

  2080.                     get_mvdata_interlaced(v, &dmv_x[bmvtype == BMV_TYPE_BACKWARD],

  2081.                                              &dmv_y[bmvtype == BMV_TYPE_BACKWARD],

  2082.                                          &pred_flag[bmvtype == BMV_TYPE_BACKWARD]);

  2083.                 }

  2084.                 ff_vc1_pred_b_mv_intfi(v, i, dmv_x, dmv_y, 0, pred_flag);

  2085.                 ff_vc1_mc_4mv_luma(v, i, bmvtype == BMV_TYPE_BACKWARD, 0);

  2086.             }

  2087.             ff_vc1_mc_4mv_chroma(v, bmvtype == BMV_TYPE_BACKWARD);

  2088.             mb_has_coeffs = idx_mbmode & 1;

  2089.         }

  2090.         if (mb_has_coeffs)

  2091.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2092.         if (cbp) {

  2093.             GET_MQUANT();

  2094.         }

  2095.         s->current_picture.qscale_table[mb_pos] = mquant;

  2096.         if (!v->ttmbf && cbp) {

  2097.             ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  2098.         }

  2099.         dst_idx = 0;

  2100.         for (i = 0; i < 6; i++) {

  2101.             s->dc_val[0][s->block_index[i]] = 0;

  2102.             dst_idx += i >> 2;

  2103.             val = ((cbp >> (5 - i)) & 1);

  2104.             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;

  2105.             if (val) {

  2106.                 pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  2107.                                          first_block, s->dest[dst_idx] + off,

  2108.                                          (i & 4) ? s->uvlinesize : s->linesize,

  2109.                                          CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);

  2110.                 block_cbp |= pat << (i << 2);

  2111.                 if (!v->ttmbf && ttmb < 8)

  2112.                     ttmb = -1;

  2113.                 first_block = 0;

  2114.             }

  2115.         }

  2116.     }

  2117.     v->cbp[s->mb_x]      = block_cbp;

  2118.     v->ttblk[s->mb_x]    = block_tt;

  2119. }

  2120. 

  2121. /** Decode one B-frame MB (in interlaced frame B picture)

  2122.  */

  2123. static int vc1_decode_b_mb_intfr(VC1Context *v)

  2124. {

  2125.     MpegEncContext *s = &v->s;

  2126.     GetBitContext *gb = &s->gb;

  2127.     int i, j;

  2128.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2129.     int cbp = 0; /* cbp decoding stuff */

  2130.     int mqdiff, mquant; /* MB quantization */

  2131.     int ttmb = v->ttfrm; /* MB Transform type */

  2132.     int mvsw = 0; /* motion vector switch */

  2133.     int mb_has_coeffs = 1; /* last_flag */

  2134.     int dmv_x, dmv_y; /* Differential MV components */

  2135.     int val; /* temp value */

  2136.     int first_block = 1;

  2137.     int dst_idx, off;

  2138.     int skipped, direct, twomv = 0;

  2139.     int block_cbp = 0, pat, block_tt = 0;

  2140.     int idx_mbmode = 0, mvbp;

  2141.     int stride_y, fieldtx;

  2142.     int bmvtype = BMV_TYPE_BACKWARD;

  2143.     int dir, dir2;

  2144. 

  2145.     mquant = v->pq; /* Lossy initialization */

  2146.     s->mb_intra = 0;

  2147.     if (v->skip_is_raw)

  2148.         skipped = get_bits1(gb);

  2149.     else

  2150.         skipped = v->s.mbskip_table[mb_pos];

  2151. 

  2152.     if (!skipped) {

  2153.         idx_mbmode = get_vlc2(gb, v->mbmode_vlc->table, VC1_INTFR_NON4MV_MBMODE_VLC_BITS, 2);

  2154.         if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_2MV_FIELD) {

  2155.             twomv = 1;

  2156.             v->blk_mv_type[s->block_index[0]] = 1;

  2157.             v->blk_mv_type[s->block_index[1]] = 1;

  2158.             v->blk_mv_type[s->block_index[2]] = 1;

  2159.             v->blk_mv_type[s->block_index[3]] = 1;

  2160.         } else {

  2161.             v->blk_mv_type[s->block_index[0]] = 0;

  2162.             v->blk_mv_type[s->block_index[1]] = 0;

  2163.             v->blk_mv_type[s->block_index[2]] = 0;

  2164.             v->blk_mv_type[s->block_index[3]] = 0;

  2165.         }

  2166.     }

  2167. 

  2168.     if (v->dmb_is_raw)

  2169.         direct = get_bits1(gb);

  2170.     else

  2171.         direct = v->direct_mb_plane[mb_pos];

  2172. 

  2173.     if (direct) {

  2174.         if (s->next_picture_ptr->field_picture)

  2175.             av_log(s->avctx, AV_LOG_WARNING, "Mixed frame/field direct mode not supported\n");

  2176.         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);

  2177.         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);

  2178.         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);

  2179.         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);

  2180. 

  2181.         if (twomv) {

  2182.             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);

  2183.             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);

  2184.             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);

  2185.             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);

  2186. 

  2187.             for (i = 1; i < 4; i += 2) {

  2188.                 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][i-1][0];

  2189.                 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][i-1][1];

  2190.                 s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][i-1][0];

  2191.                 s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][i-1][1];

  2192.             }

  2193.         } else {

  2194.             for (i = 1; i < 4; i++) {

  2195.                 s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = s->mv[0][0][0];

  2196.                 s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = s->mv[0][0][1];

  2197.                 s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = s->mv[1][0][0];

  2198.                 s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = s->mv[1][0][1];

  2199.             }

  2200.         }

  2201.     }

  2202. 

  2203.     if (ff_vc1_mbmode_intfrp[0][idx_mbmode][0] == MV_PMODE_INTFR_INTRA) { // intra MB

  2204.         for (i = 0; i < 4; i++) {

  2205.             s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0] = 0;

  2206.             s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1] = 0;

  2207.             s->mv[1][i][0] = s->current_picture.motion_val[1][s->block_index[i]][0] = 0;

  2208.             s->mv[1][i][1] = s->current_picture.motion_val[1][s->block_index[i]][1] = 0;

  2209.         }

  2210.         v->is_intra[s->mb_x] = 0x3f; // Set the bitfield to all 1.

  2211.         s->mb_intra          = 1;

  2212.         s->current_picture.mb_type[mb_pos] = MB_TYPE_INTRA;

  2213.         fieldtx = v->fieldtx_plane[mb_pos] = get_bits1(gb);

  2214.         mb_has_coeffs = get_bits1(gb);

  2215.         if (mb_has_coeffs)

  2216.             cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2217.         v->s.ac_pred = v->acpred_plane[mb_pos] = get_bits1(gb);

  2218.         GET_MQUANT();

  2219.         s->current_picture.qscale_table[mb_pos] = mquant;

  2220.         /* Set DC scale - y and c use the same (not sure if necessary here) */

  2221.         s->y_dc_scale = s->y_dc_scale_table[mquant];

  2222.         s->c_dc_scale = s->c_dc_scale_table[mquant];

  2223.         dst_idx = 0;

  2224.         for (i = 0; i < 6; i++) {

  2225.             v->a_avail = v->c_avail          = 0;

  2226.             v->mb_type[0][s->block_index[i]] = 1;

  2227.             s->dc_val[0][s->block_index[i]]  = 0;

  2228.             dst_idx += i >> 2;

  2229.             val = ((cbp >> (5 - i)) & 1);

  2230.             if (i == 2 || i == 3 || !s->first_slice_line)

  2231.                 v->a_avail = v->mb_type[0][s->block_index[i] - s->block_wrap[i]];

  2232.             if (i == 1 || i == 3 || s->mb_x)

  2233.                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];

  2234. 

  2235.             vc1_decode_intra_block(v, s->block[i], i, val, mquant,

  2236.                                    (i & 4) ? v->codingset2 : v->codingset);

  2237.             if (CONFIG_GRAY && i > 3 && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  2238.                 continue;

  2239.             v->vc1dsp.vc1_inv_trans_8x8(s->block[i]);

  2240.             if (i < 4) {

  2241.                 stride_y = s->linesize << fieldtx;

  2242.                 off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;

  2243.             } else {

  2244.                 stride_y = s->uvlinesize;

  2245.                 off = 0;

  2246.             }

  2247.             s->idsp.put_signed_pixels_clamped(s->block[i],

  2248.                                               s->dest[dst_idx] + off,

  2249.                                               stride_y);

  2250.         }

  2251.     } else {

  2252.         s->mb_intra = v->is_intra[s->mb_x] = 0;

  2253.         if (!direct) {

  2254.             if (skipped || !s->mb_intra) {

  2255.                 bmvtype = decode012(gb);

  2256.                 switch (bmvtype) {

  2257.                 case 0:

  2258.                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_BACKWARD : BMV_TYPE_FORWARD;

  2259.                     break;

  2260.                 case 1:

  2261.                     bmvtype = (v->bfraction >= (B_FRACTION_DEN/2)) ? BMV_TYPE_FORWARD : BMV_TYPE_BACKWARD;

  2262.                     break;

  2263.                 case 2:

  2264.                     bmvtype  = BMV_TYPE_INTERPOLATED;

  2265.                 }

  2266.             }

  2267. 

  2268.             if (twomv && bmvtype != BMV_TYPE_INTERPOLATED)

  2269.                 mvsw = get_bits1(gb);

  2270.         }

  2271. 

  2272.         if (!skipped) { // inter MB

  2273.             mb_has_coeffs = ff_vc1_mbmode_intfrp[0][idx_mbmode][3];

  2274.             if (mb_has_coeffs)

  2275.                 cbp = 1 + get_vlc2(&v->s.gb, v->cbpcy_vlc->table, VC1_CBPCY_P_VLC_BITS, 2);

  2276.             if (!direct) {

  2277.                 if (bmvtype == BMV_TYPE_INTERPOLATED && twomv) {

  2278.                     v->fourmvbp = get_vlc2(gb, v->fourmvbp_vlc->table, VC1_4MV_BLOCK_PATTERN_VLC_BITS, 1);

  2279.                 } else if (bmvtype == BMV_TYPE_INTERPOLATED || twomv) {

  2280.                     v->twomvbp = get_vlc2(gb, v->twomvbp_vlc->table, VC1_2MV_BLOCK_PATTERN_VLC_BITS, 1);

  2281.                 }

  2282.             }

  2283. 

  2284.             for (i = 0; i < 6; i++)

  2285.                 v->mb_type[0][s->block_index[i]] = 0;

  2286.             fieldtx = v->fieldtx_plane[mb_pos] = ff_vc1_mbmode_intfrp[0][idx_mbmode][1];

  2287.             /* for all motion vector read MVDATA and motion compensate each block */

  2288.             dst_idx = 0;

  2289.             if (direct) {

  2290.                 if (twomv) {

  2291.                     for (i = 0; i < 4; i++) {

  2292.                         ff_vc1_mc_4mv_luma(v, i, 0, 0);

  2293.                         ff_vc1_mc_4mv_luma(v, i, 1, 1);

  2294.                     }

  2295.                     ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);

  2296.                     ff_vc1_mc_4mv_chroma4(v, 1, 1, 1);

  2297.                 } else {

  2298.                     ff_vc1_mc_1mv(v, 0);

  2299.                     ff_vc1_interp_mc(v);

  2300.                 }

  2301.             } else if (twomv && bmvtype == BMV_TYPE_INTERPOLATED) {

  2302.                 mvbp = v->fourmvbp;

  2303.                 for (i = 0; i < 4; i++) {

  2304.                     dir = i==1 || i==3;

  2305.                     dmv_x = dmv_y = 0;

  2306.                     val = ((mvbp >> (3 - i)) & 1);

  2307.                     if (val)

  2308.                         get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2309.                     j = i > 1 ? 2 : 0;

  2310.                     ff_vc1_pred_mv_intfr(v, j, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);

  2311.                     ff_vc1_mc_4mv_luma(v, j, dir, dir);

  2312.                     ff_vc1_mc_4mv_luma(v, j+1, dir, dir);

  2313.                 }

  2314. 

  2315.                 ff_vc1_mc_4mv_chroma4(v, 0, 0, 0);

  2316.                 ff_vc1_mc_4mv_chroma4(v, 1, 1, 1);

  2317.             } else if (bmvtype == BMV_TYPE_INTERPOLATED) {

  2318.                 mvbp = v->twomvbp;

  2319.                 dmv_x = dmv_y = 0;

  2320.                 if (mvbp & 2)

  2321.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2322. 

  2323.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  2324.                 ff_vc1_mc_1mv(v, 0);

  2325. 

  2326.                 dmv_x = dmv_y = 0;

  2327.                 if (mvbp & 1)

  2328.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2329. 

  2330.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], 1);

  2331.                 ff_vc1_interp_mc(v);

  2332.             } else if (twomv) {

  2333.                 dir = bmvtype == BMV_TYPE_BACKWARD;

  2334.                 dir2 = dir;

  2335.                 if (mvsw)

  2336.                     dir2 = !dir;

  2337.                 mvbp = v->twomvbp;

  2338.                 dmv_x = dmv_y = 0;

  2339.                 if (mvbp & 2)

  2340.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2341.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir);

  2342. 

  2343.                 dmv_x = dmv_y = 0;

  2344.                 if (mvbp & 1)

  2345.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2346.                 ff_vc1_pred_mv_intfr(v, 2, dmv_x, dmv_y, 2, v->range_x, v->range_y, v->mb_type[0], dir2);

  2347. 

  2348.                 if (mvsw) {

  2349.                     for (i = 0; i < 2; i++) {

  2350.                         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];

  2351.                         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];

  2352.                         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];

  2353.                         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];

  2354.                     }

  2355.                 } else {

  2356.                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);

  2357.                     ff_vc1_pred_mv_intfr(v, 2, 0, 0, 2, v->range_x, v->range_y, v->mb_type[0], !dir);

  2358.                 }

  2359. 

  2360.                 ff_vc1_mc_4mv_luma(v, 0, dir, 0);

  2361.                 ff_vc1_mc_4mv_luma(v, 1, dir, 0);

  2362.                 ff_vc1_mc_4mv_luma(v, 2, dir2, 0);

  2363.                 ff_vc1_mc_4mv_luma(v, 3, dir2, 0);

  2364.                 ff_vc1_mc_4mv_chroma4(v, dir, dir2, 0);

  2365.             } else {

  2366.                 dir = bmvtype == BMV_TYPE_BACKWARD;

  2367. 

  2368.                 mvbp = ff_vc1_mbmode_intfrp[0][idx_mbmode][2];

  2369.                 dmv_x = dmv_y = 0;

  2370.                 if (mvbp)

  2371.                     get_mvdata_interlaced(v, &dmv_x, &dmv_y, 0);

  2372. 

  2373.                 ff_vc1_pred_mv_intfr(v, 0, dmv_x, dmv_y, 1, v->range_x, v->range_y, v->mb_type[0], dir);

  2374.                 v->blk_mv_type[s->block_index[0]] = 1;

  2375.                 v->blk_mv_type[s->block_index[1]] = 1;

  2376.                 v->blk_mv_type[s->block_index[2]] = 1;

  2377.                 v->blk_mv_type[s->block_index[3]] = 1;

  2378.                 ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);

  2379.                 for (i = 0; i < 2; i++) {

  2380.                     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];

  2381.                     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];

  2382.                 }

  2383.                 ff_vc1_mc_1mv(v, dir);

  2384.             }

  2385. 

  2386.             if (cbp)

  2387.                 GET_MQUANT();  // p. 227

  2388.             s->current_picture.qscale_table[mb_pos] = mquant;

  2389.             if (!v->ttmbf && cbp)

  2390.                 ttmb = get_vlc2(gb, ff_vc1_ttmb_vlc[v->tt_index].table, VC1_TTMB_VLC_BITS, 2);

  2391.             for (i = 0; i < 6; i++) {

  2392.                 s->dc_val[0][s->block_index[i]] = 0;

  2393.                 dst_idx += i >> 2;

  2394.                 val = ((cbp >> (5 - i)) & 1);

  2395.                 if (!fieldtx)

  2396.                     off = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);

  2397.                 else

  2398.                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));

  2399.                 if (val) {

  2400.                     pat = vc1_decode_p_block(v, s->block[i], i, mquant, ttmb,

  2401.                                              first_block, s->dest[dst_idx] + off,

  2402.                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),

  2403.                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);

  2404.                     block_cbp |= pat << (i << 2);

  2405.                     if (!v->ttmbf && ttmb < 8)

  2406.                         ttmb = -1;

  2407.                     first_block = 0;

  2408.                 }

  2409.             }

  2410. 

  2411.         } else { // skipped

  2412.             dir = 0;

  2413.             for (i = 0; i < 6; i++) {

  2414.                 v->mb_type[0][s->block_index[i]] = 0;

  2415.                 s->dc_val[0][s->block_index[i]] = 0;

  2416.             }

  2417.             s->current_picture.mb_type[mb_pos]      = MB_TYPE_SKIP;

  2418.             s->current_picture.qscale_table[mb_pos] = 0;

  2419.             v->blk_mv_type[s->block_index[0]] = 0;

  2420.             v->blk_mv_type[s->block_index[1]] = 0;

  2421.             v->blk_mv_type[s->block_index[2]] = 0;

  2422.             v->blk_mv_type[s->block_index[3]] = 0;

  2423. 

  2424.             if (!direct) {

  2425.                 if (bmvtype == BMV_TYPE_INTERPOLATED) {

  2426.                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 0);

  2427.                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], 1);

  2428.                 } else {

  2429.                     dir = bmvtype == BMV_TYPE_BACKWARD;

  2430.                     ff_vc1_pred_mv_intfr(v, 0, 0, 0, 1, v->range_x, v->range_y, v->mb_type[0], dir);

  2431.                     if (mvsw) {

  2432.                         int dir2 = dir;

  2433.                         if (mvsw)

  2434.                             dir2 = !dir;

  2435.                         for (i = 0; i < 2; i++) {

  2436.                             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];

  2437.                             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];

  2438.                             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];

  2439.                             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];

  2440.                         }

  2441.                     } else {

  2442.                         v->blk_mv_type[s->block_index[0]] = 1;

  2443.                         v->blk_mv_type[s->block_index[1]] = 1;

  2444.                         v->blk_mv_type[s->block_index[2]] = 1;

  2445.                         v->blk_mv_type[s->block_index[3]] = 1;

  2446.                         ff_vc1_pred_mv_intfr(v, 0, 0, 0, 2, v->range_x, v->range_y, 0, !dir);

  2447.                         for (i = 0; i < 2; i++) {

  2448.                             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];

  2449.                             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];

  2450.                         }

  2451.                     }

  2452.                 }

  2453.             }

  2454. 

  2455.             ff_vc1_mc_1mv(v, dir);

  2456.             if (direct || bmvtype == BMV_TYPE_INTERPOLATED) {

  2457.                 ff_vc1_interp_mc(v);

  2458.             }

  2459.             v->fieldtx_plane[mb_pos] = 0;

  2460.         }

  2461.     }

  2462.     v->cbp[s->mb_x]      = block_cbp;

  2463.     v->ttblk[s->mb_x]    = block_tt;

  2464. 

  2465.     return 0;

  2466. }

  2467. 

  2468. /** Decode blocks of I-frame

  2469.  */

  2470. static void vc1_decode_i_blocks(VC1Context *v)

  2471. {

  2472.     int k, j;

  2473.     MpegEncContext *s = &v->s;

  2474.     int cbp, val;

  2475.     uint8_t *coded_val;

  2476.     int mb_pos;

  2477. 

  2478.     /* select coding mode used for VLC tables selection */

  2479.     switch (v->y_ac_table_index) {

  2480.     case 0:

  2481.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2482.         break;

  2483.     case 1:

  2484.         v->codingset = CS_HIGH_MOT_INTRA;

  2485.         break;

  2486.     case 2:

  2487.         v->codingset = CS_MID_RATE_INTRA;

  2488.         break;

  2489.     }

  2490. 

  2491.     switch (v->c_ac_table_index) {

  2492.     case 0:

  2493.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2494.         break;

  2495.     case 1:

  2496.         v->codingset2 = CS_HIGH_MOT_INTER;

  2497.         break;

  2498.     case 2:

  2499.         v->codingset2 = CS_MID_RATE_INTER;

  2500.         break;

  2501.     }

  2502. 

  2503.     /* Set DC scale - y and c use the same */

  2504.     s->y_dc_scale = s->y_dc_scale_table[v->pq];

  2505.     s->c_dc_scale = s->c_dc_scale_table[v->pq];

  2506. 

  2507.     //do frame decode

  2508.     s->mb_x = s->mb_y = 0;

  2509.     s->mb_intra         = 1;

  2510.     s->first_slice_line = 1;

  2511.     for (s->mb_y = 0; s->mb_y < s->end_mb_y; s->mb_y++) {

  2512.         s->mb_x = 0;

  2513.         init_block_index(v);

  2514.         for (; s->mb_x < v->end_mb_x; s->mb_x++) {

  2515.             uint8_t *dst[6];

  2516.             ff_update_block_index(s);

  2517.             dst[0] = s->dest[0];

  2518.             dst[1] = dst[0] + 8;

  2519.             dst[2] = s->dest[0] + s->linesize * 8;

  2520.             dst[3] = dst[2] + 8;

  2521.             dst[4] = s->dest[1];

  2522.             dst[5] = s->dest[2];

  2523.             s->bdsp.clear_blocks(s->block[0]);

  2524.             mb_pos = s->mb_x + s->mb_y * s->mb_width;

  2525.             s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;

  2526.             s->current_picture.qscale_table[mb_pos]                = v->pq;

  2527.             s->current_picture.motion_val[1][s->block_index[0]][0] = 0;

  2528.             s->current_picture.motion_val[1][s->block_index[0]][1] = 0;

  2529. 

  2530.             // do actual MB decoding and displaying

  2531.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  2532.             v->s.ac_pred = get_bits1(&v->s.gb);

  2533. 

  2534.             for (k = 0; k < 6; k++) {

  2535.                 val = ((cbp >> (5 - k)) & 1);

  2536. 

  2537.                 if (k < 4) {

  2538.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  2539.                     val        = val ^ pred;

  2540.                     *coded_val = val;

  2541.                 }

  2542.                 cbp |= val << (5 - k);

  2543. 

  2544.                 vc1_decode_i_block(v, s->block[k], k, val, (k < 4) ? v->codingset : v->codingset2);

  2545. 

  2546.                 if (CONFIG_GRAY && k > 3 && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  2547.                     continue;

  2548.                 v->vc1dsp.vc1_inv_trans_8x8(s->block[k]);

  2549.                 if (v->pq >= 9 && v->overlap) {

  2550.                     if (v->rangeredfrm)

  2551.                         for (j = 0; j < 64; j++)

  2552.                             s->block[k][j] <<= 1;

  2553.                     s->idsp.put_signed_pixels_clamped(s->block[k], dst[k],

  2554.                                                       k & 4 ? s->uvlinesize

  2555.                                                             : s->linesize);

  2556.                 } else {

  2557.                     if (v->rangeredfrm)

  2558.                         for (j = 0; j < 64; j++)

  2559.                             s->block[k][j] = (s->block[k][j] - 64) << 1;

  2560.                     s->idsp.put_pixels_clamped(s->block[k], dst[k],

  2561.                                                k & 4 ? s->uvlinesize

  2562.                                                      : s->linesize);

  2563.                 }

  2564.             }

  2565. 

  2566.             if (v->pq >= 9 && v->overlap) {

  2567.                 if (s->mb_x) {

  2568.                     v->vc1dsp.vc1_h_overlap(s->dest[0], s->linesize);

  2569.                     v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  2570.                     if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {

  2571.                         v->vc1dsp.vc1_h_overlap(s->dest[1], s->uvlinesize);

  2572.                         v->vc1dsp.vc1_h_overlap(s->dest[2], s->uvlinesize);

  2573.                     }

  2574.                 }

  2575.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8, s->linesize);

  2576.                 v->vc1dsp.vc1_h_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  2577.                 if (!s->first_slice_line) {

  2578.                     v->vc1dsp.vc1_v_overlap(s->dest[0], s->linesize);

  2579.                     v->vc1dsp.vc1_v_overlap(s->dest[0] + 8, s->linesize);

  2580.                     if (!CONFIG_GRAY || !(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {

  2581.                         v->vc1dsp.vc1_v_overlap(s->dest[1], s->uvlinesize);

  2582.                         v->vc1dsp.vc1_v_overlap(s->dest[2], s->uvlinesize);

  2583.                     }

  2584.                 }

  2585.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize, s->linesize);

  2586.                 v->vc1dsp.vc1_v_overlap(s->dest[0] + 8 * s->linesize + 8, s->linesize);

  2587.             }

  2588.             if (v->s.loop_filter)

  2589.                 ff_vc1_loop_filter_iblk(v, v->pq);

  2590. 

  2591.             if (get_bits_count(&s->gb) > v->bits) {

  2592.                 ff_er_add_slice(&s->er, 0, 0, s->mb_x, s->mb_y, ER_MB_ERROR);

  2593.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  2594.                        get_bits_count(&s->gb), v->bits);

  2595.                 return;

  2596.             }

  2597.         }

  2598.         if (!v->s.loop_filter)

  2599.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  2600.         else if (s->mb_y)

  2601.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  2602. 

  2603.         s->first_slice_line = 0;

  2604.     }

  2605.     if (v->s.loop_filter)

  2606.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  2607. 

  2608.     /* This is intentionally mb_height and not end_mb_y - unlike in advanced

  2609.      * profile, these only differ are when decoding MSS2 rectangles. */

  2610.     ff_er_add_slice(&s->er, 0, 0, s->mb_width - 1, s->mb_height - 1, ER_MB_END);

  2611. }

  2612. 

  2613. /** Decode blocks of I-frame for advanced profile

  2614.  */

  2615. static void vc1_decode_i_blocks_adv(VC1Context *v)

  2616. {

  2617.     int k;

  2618.     MpegEncContext *s = &v->s;

  2619.     int cbp, val;

  2620.     uint8_t *coded_val;

  2621.     int mb_pos;

  2622.     int mquant = v->pq;

  2623.     int mqdiff;

  2624.     GetBitContext *gb = &s->gb;

  2625. 

  2626.     /* select coding mode used for VLC tables selection */

  2627.     switch (v->y_ac_table_index) {

  2628.     case 0:

  2629.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2630.         break;

  2631.     case 1:

  2632.         v->codingset = CS_HIGH_MOT_INTRA;

  2633.         break;

  2634.     case 2:

  2635.         v->codingset = CS_MID_RATE_INTRA;

  2636.         break;

  2637.     }

  2638. 

  2639.     switch (v->c_ac_table_index) {

  2640.     case 0:

  2641.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2642.         break;

  2643.     case 1:

  2644.         v->codingset2 = CS_HIGH_MOT_INTER;

  2645.         break;

  2646.     case 2:

  2647.         v->codingset2 = CS_MID_RATE_INTER;

  2648.         break;

  2649.     }

  2650. 

  2651.     // do frame decode

  2652.     s->mb_x             = s->mb_y = 0;

  2653.     s->mb_intra         = 1;

  2654.     s->first_slice_line = 1;

  2655.     s->mb_y             = s->start_mb_y;

  2656.     if (s->start_mb_y) {

  2657.         s->mb_x = 0;

  2658.         init_block_index(v);

  2659.         memset(&s->coded_block[s->block_index[0] - s->b8_stride], 0,

  2660.                (1 + s->b8_stride) * sizeof(*s->coded_block));

  2661.     }

  2662.     for (; s->mb_y < s->end_mb_y; s->mb_y++) {

  2663.         s->mb_x = 0;

  2664.         init_block_index(v);

  2665.         for (;s->mb_x < s->mb_width; s->mb_x++) {

  2666.             int16_t (*block)[64] = v->block[v->cur_blk_idx];

  2667.             ff_update_block_index(s);

  2668.             s->bdsp.clear_blocks(block[0]);

  2669.             mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  2670.             s->current_picture.mb_type[mb_pos + v->mb_off]                         = MB_TYPE_INTRA;

  2671.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  2672.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  2673. 

  2674.             // do actual MB decoding and displaying

  2675.             if (v->fieldtx_is_raw)

  2676.                 v->fieldtx_plane[mb_pos] = get_bits1(&v->s.gb);

  2677.             cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

  2678.             if (v->acpred_is_raw)

  2679.                 v->s.ac_pred = get_bits1(&v->s.gb);

  2680.             else

  2681.                 v->s.ac_pred = v->acpred_plane[mb_pos];

  2682. 

  2683.             if (v->condover == CONDOVER_SELECT && v->overflg_is_raw)

  2684.                 v->over_flags_plane[mb_pos] = get_bits1(&v->s.gb);

  2685. 

  2686.             GET_MQUANT();

  2687. 

  2688.             s->current_picture.qscale_table[mb_pos] = mquant;

  2689.             /* Set DC scale - y and c use the same */

  2690.             s->y_dc_scale = s->y_dc_scale_table[mquant];

  2691.             s->c_dc_scale = s->c_dc_scale_table[mquant];

  2692. 

  2693.             for (k = 0; k < 6; k++) {

  2694.                 v->mb_type[0][s->block_index[k]] = 1;

  2695. 

  2696.                 val = ((cbp >> (5 - k)) & 1);

  2697. 

  2698.                 if (k < 4) {

  2699.                     int pred   = vc1_coded_block_pred(&v->s, k, &coded_val);

  2700.                     val        = val ^ pred;

  2701.                     *coded_val = val;

  2702.                 }

  2703.                 cbp |= val << (5 - k);

  2704. 

  2705.                 v->a_avail = !s->first_slice_line || (k == 2 || k == 3);

  2706.                 v->c_avail = !!s->mb_x || (k == 1 || k == 3);

  2707. 

  2708.                 vc1_decode_i_block_adv(v, block[k], k, val,

  2709.                                        (k < 4) ? v->codingset : v->codingset2, mquant);

  2710. 

  2711.                 if (CONFIG_GRAY && k > 3 && (s->avctx->flags & AV_CODEC_FLAG_GRAY))

  2712.                     continue;

  2713.                 v->vc1dsp.vc1_inv_trans_8x8(block[k]);

  2714.             }

  2715. 

  2716.             if (v->overlap && v->condover != CONDOVER_NONE)

  2717.                 ff_vc1_i_overlap_filter(v);

  2718.             vc1_put_signed_blocks_clamped(v);

  2719.             if (v->s.loop_filter)

  2720.                 ff_vc1_i_loop_filter(v);

  2721. 

  2722.             if (get_bits_count(&s->gb) > v->bits) {

  2723.                 // TODO: may need modification to handle slice coding

  2724.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  2725.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i\n",

  2726.                        get_bits_count(&s->gb), v->bits);

  2727.                 return;

  2728.             }

  2729.             inc_blk_idx(v->topleft_blk_idx);

  2730.             inc_blk_idx(v->top_blk_idx);

  2731.             inc_blk_idx(v->left_blk_idx);

  2732.             inc_blk_idx(v->cur_blk_idx);

  2733.         }

  2734.         if (!v->s.loop_filter)

  2735.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  2736.         else if (s->mb_y)

  2737.             ff_mpeg_draw_horiz_band(s, (s->mb_y-1) * 16, 16);

  2738.         s->first_slice_line = 0;

  2739.     }

  2740. 

  2741.     if (v->s.loop_filter)

  2742.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  2743.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  2744.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  2745. }

  2746. 

  2747. static void vc1_decode_p_blocks(VC1Context *v)

  2748. {

  2749.     MpegEncContext *s = &v->s;

  2750.     int apply_loop_filter;

  2751. 

  2752.     /* select coding mode used for VLC tables selection */

  2753.     switch (v->c_ac_table_index) {

  2754.     case 0:

  2755.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2756.         break;

  2757.     case 1:

  2758.         v->codingset = CS_HIGH_MOT_INTRA;

  2759.         break;

  2760.     case 2:

  2761.         v->codingset = CS_MID_RATE_INTRA;

  2762.         break;

  2763.     }

  2764. 

  2765.     switch (v->c_ac_table_index) {

  2766.     case 0:

  2767.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2768.         break;

  2769.     case 1:

  2770.         v->codingset2 = CS_HIGH_MOT_INTER;

  2771.         break;

  2772.     case 2:

  2773.         v->codingset2 = CS_MID_RATE_INTER;

  2774.         break;

  2775.     }

  2776. 

  2777.     apply_loop_filter   = s->loop_filter && !(s->avctx->skip_loop_filter >= AVDISCARD_NONKEY);

  2778.     s->first_slice_line = 1;

  2779.     memset(v->cbp_base, 0, sizeof(v->cbp_base[0]) * 3 * s->mb_stride);

  2780.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  2781.         s->mb_x = 0;

  2782.         init_block_index(v);

  2783.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  2784.             ff_update_block_index(s);

  2785. 

  2786.             if (v->fcm == ILACE_FIELD) {

  2787.                 vc1_decode_p_mb_intfi(v);

  2788.                 if (apply_loop_filter)

  2789.                     ff_vc1_p_loop_filter(v);

  2790.             } else if (v->fcm == ILACE_FRAME) {

  2791.                 vc1_decode_p_mb_intfr(v);

  2792.                 if (apply_loop_filter)

  2793.                     ff_vc1_p_intfr_loop_filter(v);

  2794.             } else {

  2795.                 vc1_decode_p_mb(v);

  2796.                 if (apply_loop_filter)

  2797.                     ff_vc1_p_loop_filter(v);

  2798.             }

  2799.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  2800.                 // TODO: may need modification to handle slice coding

  2801.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  2802.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  2803.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  2804.                 return;

  2805.             }

  2806.             inc_blk_idx(v->topleft_blk_idx);

  2807.             inc_blk_idx(v->top_blk_idx);

  2808.             inc_blk_idx(v->left_blk_idx);

  2809.             inc_blk_idx(v->cur_blk_idx);

  2810.         }

  2811.         memmove(v->cbp_base,

  2812.                 v->cbp - s->mb_stride,

  2813.                 sizeof(v->cbp_base[0]) * 2 * s->mb_stride);

  2814.         memmove(v->ttblk_base,

  2815.                 v->ttblk - s->mb_stride,

  2816.                 sizeof(v->ttblk_base[0]) * 2 * s->mb_stride);

  2817.         memmove(v->is_intra_base,

  2818.                 v->is_intra - s->mb_stride,

  2819.                 sizeof(v->is_intra_base[0]) * 2 * s->mb_stride);

  2820.         memmove(v->luma_mv_base,

  2821.                 v->luma_mv - s->mb_stride,

  2822.                 sizeof(v->luma_mv_base[0]) * 2 * s->mb_stride);

  2823.         if (s->mb_y != s->start_mb_y)

  2824.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  2825.         s->first_slice_line = 0;

  2826.     }

  2827.     if (s->end_mb_y >= s->start_mb_y)

  2828.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  2829.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  2830.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  2831. }

  2832. 

  2833. static void vc1_decode_b_blocks(VC1Context *v)

  2834. {

  2835.     MpegEncContext *s = &v->s;

  2836. 

  2837.     /* select coding mode used for VLC tables selection */

  2838.     switch (v->c_ac_table_index) {

  2839.     case 0:

  2840.         v->codingset = (v->pqindex <= 8) ? CS_HIGH_RATE_INTRA : CS_LOW_MOT_INTRA;

  2841.         break;

  2842.     case 1:

  2843.         v->codingset = CS_HIGH_MOT_INTRA;

  2844.         break;

  2845.     case 2:

  2846.         v->codingset = CS_MID_RATE_INTRA;

  2847.         break;

  2848.     }

  2849. 

  2850.     switch (v->c_ac_table_index) {

  2851.     case 0:

  2852.         v->codingset2 = (v->pqindex <= 8) ? CS_HIGH_RATE_INTER : CS_LOW_MOT_INTER;

  2853.         break;

  2854.     case 1:

  2855.         v->codingset2 = CS_HIGH_MOT_INTER;

  2856.         break;

  2857.     case 2:

  2858.         v->codingset2 = CS_MID_RATE_INTER;

  2859.         break;

  2860.     }

  2861. 

  2862.     s->first_slice_line = 1;

  2863.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  2864.         s->mb_x = 0;

  2865.         init_block_index(v);

  2866.         for (; s->mb_x < s->mb_width; s->mb_x++) {

  2867.             ff_update_block_index(s);

  2868. 

  2869.             if (v->fcm == ILACE_FIELD) {

  2870.                 vc1_decode_b_mb_intfi(v);

  2871.                 if (v->s.loop_filter)

  2872.                     ff_vc1_b_intfi_loop_filter(v);

  2873.             } else if (v->fcm == ILACE_FRAME) {

  2874.                 vc1_decode_b_mb_intfr(v);

  2875.                 if (v->s.loop_filter)

  2876.                     ff_vc1_p_intfr_loop_filter(v);

  2877.             } else {

  2878.                 vc1_decode_b_mb(v);

  2879.                 if (v->s.loop_filter)

  2880.                     ff_vc1_i_loop_filter(v);

  2881.             }

  2882.             if (get_bits_count(&s->gb) > v->bits || get_bits_count(&s->gb) < 0) {

  2883.                 // TODO: may need modification to handle slice coding

  2884.                 ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR);

  2885.                 av_log(s->avctx, AV_LOG_ERROR, "Bits overconsumption: %i > %i at %ix%i\n",

  2886.                        get_bits_count(&s->gb), v->bits, s->mb_x, s->mb_y);

  2887.                 return;

  2888.             }

  2889.         }

  2890.         memmove(v->cbp_base,

  2891.                 v->cbp - s->mb_stride,

  2892.                 sizeof(v->cbp_base[0]) * 2 * s->mb_stride);

  2893.         memmove(v->ttblk_base,

  2894.                 v->ttblk - s->mb_stride,

  2895.                 sizeof(v->ttblk_base[0]) * 2 * s->mb_stride);

  2896.         memmove(v->is_intra_base,

  2897.                 v->is_intra - s->mb_stride,

  2898.                 sizeof(v->is_intra_base[0]) * 2 * s->mb_stride);

  2899.         if (!v->s.loop_filter)

  2900.             ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  2901.         else if (s->mb_y)

  2902.             ff_mpeg_draw_horiz_band(s, (s->mb_y - 1) * 16, 16);

  2903.         s->first_slice_line = 0;

  2904.     }

  2905.     if (v->s.loop_filter)

  2906.         ff_mpeg_draw_horiz_band(s, (s->end_mb_y - 1) * 16, 16);

  2907.     ff_er_add_slice(&s->er, 0, s->start_mb_y << v->field_mode, s->mb_width - 1,

  2908.                     (s->end_mb_y << v->field_mode) - 1, ER_MB_END);

  2909. }

  2910. 

  2911. static void vc1_decode_skip_blocks(VC1Context *v)

  2912. {

  2913.     MpegEncContext *s = &v->s;

  2914. 

  2915.     if (!v->s.last_picture.f->data[0])

  2916.         return;

  2917. 

  2918.     ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_width - 1, s->end_mb_y - 1, ER_MB_END);

  2919.     s->first_slice_line = 1;

  2920.     for (s->mb_y = s->start_mb_y; s->mb_y < s->end_mb_y; s->mb_y++) {

  2921.         s->mb_x = 0;

  2922.         init_block_index(v);

  2923.         ff_update_block_index(s);

  2924.         memcpy(s->dest[0], s->last_picture.f->data[0] + s->mb_y * 16 * s->linesize,   s->linesize   * 16);

  2925.         memcpy(s->dest[1], s->last_picture.f->data[1] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  2926.         memcpy(s->dest[2], s->last_picture.f->data[2] + s->mb_y *  8 * s->uvlinesize, s->uvlinesize *  8);

  2927.         ff_mpeg_draw_horiz_band(s, s->mb_y * 16, 16);

  2928.         s->first_slice_line = 0;

  2929.     }

  2930.     s->pict_type = AV_PICTURE_TYPE_P;

  2931. }

  2932. 

  2933. void ff_vc1_decode_blocks(VC1Context *v)

  2934. {

  2935. 

  2936.     v->s.esc3_level_length = 0;

  2937.     if (v->x8_type) {

  2938.         ff_intrax8_decode_picture(&v->x8, &v->s.current_picture,

  2939.                                   &v->s.gb, &v->s.mb_x, &v->s.mb_y,

  2940.                                   2 * v->pq + v->halfpq, v->pq * !v->pquantizer,

  2941.                                   v->s.loop_filter, v->s.low_delay);

  2942. 

  2943.         ff_er_add_slice(&v->s.er, 0, 0,

  2944.                         (v->s.mb_x >> 1) - 1, (v->s.mb_y >> 1) - 1,

  2945.                         ER_MB_END);

  2946.     } else {

  2947.         v->cur_blk_idx     =  0;

  2948.         v->left_blk_idx    = -1;

  2949.         v->topleft_blk_idx =  1;

  2950.         v->top_blk_idx     =  2;

  2951.         switch (v->s.pict_type) {

  2952.         case AV_PICTURE_TYPE_I:

  2953.             if (v->profile == PROFILE_ADVANCED)

  2954.                 vc1_decode_i_blocks_adv(v);

  2955.             else

  2956.                 vc1_decode_i_blocks(v);

  2957.             break;

  2958.         case AV_PICTURE_TYPE_P:

  2959.             if (v->p_frame_skipped)

  2960.                 vc1_decode_skip_blocks(v);

  2961.             else

  2962.                 vc1_decode_p_blocks(v);

  2963.             break;

  2964.         case AV_PICTURE_TYPE_B:

  2965.             if (v->bi_type) {

  2966.                 if (v->profile == PROFILE_ADVANCED)

  2967.                     vc1_decode_i_blocks_adv(v);

  2968.                 else

  2969.                     vc1_decode_i_blocks(v);

  2970.             } else

  2971.                 vc1_decode_b_blocks(v);

  2972.             break;

  2973.         }

  2974.     }

  2975. }