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FFmpeg/libavcodec/rv34.c

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  1. /*

  2.  * RV30/40 decoder common data

  3.  * Copyright (c) 2007 Mike Melanson, Konstantin Shishkov

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * RV30/40 decoder common data

  25.  */

  26. 

  27. #include "libavutil/imgutils.h"

  28. #include "libavutil/internal.h"

  29. 

  30. #include "avcodec.h"

  31. #include "error_resilience.h"

  32. #include "mpegvideo.h"

  33. #include "golomb.h"

  34. #include "internal.h"

  35. #include "mathops.h"

  36. #include "rectangle.h"

  37. #include "thread.h"

  38. 

  39. #include "rv34vlc.h"

  40. #include "rv34data.h"

  41. #include "rv34.h"

  42. 

  43. static inline void ZERO8x2(void* dst, int stride)

  44. {

  45.     fill_rectangle(dst,                 1, 2, stride, 0, 4);

  46.     fill_rectangle(((uint8_t*)(dst))+4, 1, 2, stride, 0, 4);

  47. }

  48. 

  49. /** translation of RV30/40 macroblock types to lavc ones */

  50. static const int rv34_mb_type_to_lavc[12] = {

  51.     MB_TYPE_INTRA,

  52.     MB_TYPE_INTRA16x16              | MB_TYPE_SEPARATE_DC,

  53.     MB_TYPE_16x16   | MB_TYPE_L0,

  54.     MB_TYPE_8x8     | MB_TYPE_L0,

  55.     MB_TYPE_16x16   | MB_TYPE_L0,

  56.     MB_TYPE_16x16   | MB_TYPE_L1,

  57.     MB_TYPE_SKIP,

  58.     MB_TYPE_DIRECT2 | MB_TYPE_16x16,

  59.     MB_TYPE_16x8    | MB_TYPE_L0,

  60.     MB_TYPE_8x16    | MB_TYPE_L0,

  61.     MB_TYPE_16x16   | MB_TYPE_L0L1,

  62.     MB_TYPE_16x16   | MB_TYPE_L0    | MB_TYPE_SEPARATE_DC

  63. };

  64. 

  65. 

  66. static RV34VLC intra_vlcs[NUM_INTRA_TABLES], inter_vlcs[NUM_INTER_TABLES];

  67. 

  68. static int rv34_decode_mv(RV34DecContext *r, int block_type);

  69. 

  70. /**

  71.  * @name RV30/40 VLC generating functions

  72.  * @{

  73.  */

  74. 

  75. static const int table_offs[] = {

  76.       0,   1818,   3622,   4144,   4698,   5234,   5804,   5868,   5900,   5932,

  77.    5996,   6252,   6316,   6348,   6380,   7674,   8944,  10274,  11668,  12250,

  78.   14060,  15846,  16372,  16962,  17512,  18148,  18180,  18212,  18244,  18308,

  79.   18564,  18628,  18660,  18692,  20036,  21314,  22648,  23968,  24614,  26384,

  80.   28190,  28736,  29366,  29938,  30608,  30640,  30672,  30704,  30768,  31024,

  81.   31088,  31120,  31184,  32570,  33898,  35236,  36644,  37286,  39020,  40802,

  82.   41368,  42052,  42692,  43348,  43380,  43412,  43444,  43476,  43604,  43668,

  83.   43700,  43732,  45100,  46430,  47778,  49160,  49802,  51550,  53340,  53972,

  84.   54648,  55348,  55994,  56122,  56154,  56186,  56218,  56346,  56410,  56442,

  85.   56474,  57878,  59290,  60636,  62036,  62682,  64460,  64524,  64588,  64716,

  86.   64844,  66076,  67466,  67978,  68542,  69064,  69648,  70296,  72010,  72074,

  87.   72138,  72202,  72330,  73572,  74936,  75454,  76030,  76566,  77176,  77822,

  88.   79582,  79646,  79678,  79742,  79870,  81180,  82536,  83064,  83672,  84242,

  89.   84934,  85576,  87384,  87448,  87480,  87544,  87672,  88982,  90340,  90902,

  90.   91598,  92182,  92846,  93488,  95246,  95278,  95310,  95374,  95502,  96878,

  91.   98266,  98848,  99542, 100234, 100884, 101524, 103320, 103352, 103384, 103416,

  92.  103480, 104874, 106222, 106910, 107584, 108258, 108902, 109544, 111366, 111398,

  93.  111430, 111462, 111494, 112878, 114320, 114988, 115660, 116310, 116950, 117592

  94. };

  95. 

  96. static VLC_TYPE table_data[117592][2];

  97. 

  98. /**

  99.  * Generate VLC from codeword lengths.

  100.  * @param bits   codeword lengths (zeroes are accepted)

  101.  * @param size   length of input data

  102.  * @param vlc    output VLC

  103.  * @param insyms symbols for input codes (NULL for default ones)

  104.  * @param num    VLC table number (for static initialization)

  105.  */

  106. static void rv34_gen_vlc(const uint8_t *bits, int size, VLC *vlc, const uint8_t *insyms,

  107.                          const int num)

  108. {

  109.     int i;

  110.     int counts[17] = {0}, codes[17];

  111.     uint16_t cw[MAX_VLC_SIZE], syms[MAX_VLC_SIZE];

  112.     uint8_t bits2[MAX_VLC_SIZE];

  113.     int maxbits = 0, realsize = 0;

  114. 

  115.     for(i = 0; i < size; i++){

  116.         if(bits[i]){

  117.             bits2[realsize] = bits[i];

  118.             syms[realsize] = insyms ? insyms[i] : i;

  119.             realsize++;

  120.             maxbits = FFMAX(maxbits, bits[i]);

  121.             counts[bits[i]]++;

  122.         }

  123.     }

  124. 

  125.     codes[0] = 0;

  126.     for(i = 0; i < 16; i++)

  127.         codes[i+1] = (codes[i] + counts[i]) << 1;

  128.     for(i = 0; i < realsize; i++)

  129.         cw[i] = codes[bits2[i]]++;

  130. 

  131.     vlc->table = &table_data[table_offs[num]];

  132.     vlc->table_allocated = table_offs[num + 1] - table_offs[num];

  133.     ff_init_vlc_sparse(vlc, FFMIN(maxbits, 9), realsize,

  134.                        bits2, 1, 1,

  135.                        cw,    2, 2,

  136.                        syms,  2, 2, INIT_VLC_USE_NEW_STATIC);

  137. }

  138. 

  139. /**

  140.  * Initialize all tables.

  141.  */

  142. static av_cold void rv34_init_tables(void)

  143. {

  144.     int i, j, k;

  145. 

  146.     for(i = 0; i < NUM_INTRA_TABLES; i++){

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

  148.             rv34_gen_vlc(rv34_table_intra_cbppat   [i][j], CBPPAT_VLC_SIZE,   &intra_vlcs[i].cbppattern[j],     NULL, 19*i + 0 + j);

  149.             rv34_gen_vlc(rv34_table_intra_secondpat[i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].second_pattern[j], NULL, 19*i + 2 + j);

  150.             rv34_gen_vlc(rv34_table_intra_thirdpat [i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].third_pattern[j],  NULL, 19*i + 4 + j);

  151.             for(k = 0; k < 4; k++){

  152.                 rv34_gen_vlc(rv34_table_intra_cbp[i][j+k*2],  CBP_VLC_SIZE,   &intra_vlcs[i].cbp[j][k],         rv34_cbp_code, 19*i + 6 + j*4 + k);

  153.             }

  154.         }

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

  156.             rv34_gen_vlc(rv34_table_intra_firstpat[i][j], FIRSTBLK_VLC_SIZE, &intra_vlcs[i].first_pattern[j], NULL, 19*i + 14 + j);

  157.         }

  158.         rv34_gen_vlc(rv34_intra_coeff[i], COEFF_VLC_SIZE, &intra_vlcs[i].coefficient, NULL, 19*i + 18);

  159.     }

  160. 

  161.     for(i = 0; i < NUM_INTER_TABLES; i++){

  162.         rv34_gen_vlc(rv34_inter_cbppat[i], CBPPAT_VLC_SIZE, &inter_vlcs[i].cbppattern[0], NULL, i*12 + 95);

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

  164.             rv34_gen_vlc(rv34_inter_cbp[i][j], CBP_VLC_SIZE, &inter_vlcs[i].cbp[0][j], rv34_cbp_code, i*12 + 96 + j);

  165.         }

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

  167.             rv34_gen_vlc(rv34_table_inter_firstpat [i][j], FIRSTBLK_VLC_SIZE, &inter_vlcs[i].first_pattern[j],  NULL, i*12 + 100 + j);

  168.             rv34_gen_vlc(rv34_table_inter_secondpat[i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].second_pattern[j], NULL, i*12 + 102 + j);

  169.             rv34_gen_vlc(rv34_table_inter_thirdpat [i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].third_pattern[j],  NULL, i*12 + 104 + j);

  170.         }

  171.         rv34_gen_vlc(rv34_inter_coeff[i], COEFF_VLC_SIZE, &inter_vlcs[i].coefficient, NULL, i*12 + 106);

  172.     }

  173. }

  174. 

  175. /** @} */ // vlc group

  176. 

  177. /**

  178.  * @name RV30/40 4x4 block decoding functions

  179.  * @{

  180.  */

  181. 

  182. /**

  183.  * Decode coded block pattern.

  184.  */

  185. static int rv34_decode_cbp(GetBitContext *gb, RV34VLC *vlc, int table)

  186. {

  187.     int pattern, code, cbp=0;

  188.     int ones;

  189.     static const int cbp_masks[3] = {0x100000, 0x010000, 0x110000};

  190.     static const int shifts[4] = { 0, 2, 8, 10 };

  191.     const int *curshift = shifts;

  192.     int i, t, mask;

  193. 

  194.     code = get_vlc2(gb, vlc->cbppattern[table].table, 9, 2);

  195.     pattern = code & 0xF;

  196.     code >>= 4;

  197. 

  198.     ones = rv34_count_ones[pattern];

  199. 

  200.     for(mask = 8; mask; mask >>= 1, curshift++){

  201.         if(pattern & mask)

  202.             cbp |= get_vlc2(gb, vlc->cbp[table][ones].table, vlc->cbp[table][ones].bits, 1) << curshift[0];

  203.     }

  204. 

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

  206.         t = (modulo_three_table[code] >> (6 - 2*i)) & 3;

  207.         if(t == 1)

  208.             cbp |= cbp_masks[get_bits1(gb)] << i;

  209.         if(t == 2)

  210.             cbp |= cbp_masks[2] << i;

  211.     }

  212.     return cbp;

  213. }

  214. 

  215. /**

  216.  * Get one coefficient value from the bitstream and store it.

  217.  */

  218. static inline void decode_coeff(int16_t *dst, int coef, int esc, GetBitContext *gb, VLC* vlc, int q)

  219. {

  220.     if(coef){

  221.         if(coef == esc){

  222.             coef = get_vlc2(gb, vlc->table, 9, 2);

  223.             if(coef > 23){

  224.                 coef -= 23;

  225.                 coef = 22 + ((1 << coef) | get_bits(gb, coef));

  226.             }

  227.             coef += esc;

  228.         }

  229.         if(get_bits1(gb))

  230.             coef = -coef;

  231.         *dst = (coef*q + 8) >> 4;

  232.     }

  233. }

  234. 

  235. /**

  236.  * Decode 2x2 subblock of coefficients.

  237.  */

  238. static inline void decode_subblock(int16_t *dst, int code, const int is_block2, GetBitContext *gb, VLC *vlc, int q)

  239. {

  240.     int flags = modulo_three_table[code];

  241. 

  242.     decode_coeff(    dst+0*4+0, (flags >> 6)    , 3, gb, vlc, q);

  243.     if(is_block2){

  244.         decode_coeff(dst+1*4+0, (flags >> 4) & 3, 2, gb, vlc, q);

  245.         decode_coeff(dst+0*4+1, (flags >> 2) & 3, 2, gb, vlc, q);

  246.     }else{

  247.         decode_coeff(dst+0*4+1, (flags >> 4) & 3, 2, gb, vlc, q);

  248.         decode_coeff(dst+1*4+0, (flags >> 2) & 3, 2, gb, vlc, q);

  249.     }

  250.     decode_coeff(    dst+1*4+1, (flags >> 0) & 3, 2, gb, vlc, q);

  251. }

  252. 

  253. /**

  254.  * Decode a single coefficient.

  255.  */

  256. static inline void decode_subblock1(int16_t *dst, int code, GetBitContext *gb, VLC *vlc, int q)

  257. {

  258.     int coeff = modulo_three_table[code] >> 6;

  259.     decode_coeff(dst, coeff, 3, gb, vlc, q);

  260. }

  261. 

  262. static inline void decode_subblock3(int16_t *dst, int code, GetBitContext *gb, VLC *vlc,

  263.                                     int q_dc, int q_ac1, int q_ac2)

  264. {

  265.     int flags = modulo_three_table[code];

  266. 

  267.     decode_coeff(dst+0*4+0, (flags >> 6)    , 3, gb, vlc, q_dc);

  268.     decode_coeff(dst+0*4+1, (flags >> 4) & 3, 2, gb, vlc, q_ac1);

  269.     decode_coeff(dst+1*4+0, (flags >> 2) & 3, 2, gb, vlc, q_ac1);

  270.     decode_coeff(dst+1*4+1, (flags >> 0) & 3, 2, gb, vlc, q_ac2);

  271. }

  272. 

  273. /**

  274.  * Decode coefficients for 4x4 block.

  275.  *

  276.  * This is done by filling 2x2 subblocks with decoded coefficients

  277.  * in this order (the same for subblocks and subblock coefficients):

  278.  *  o--o

  279.  *    /

  280.  *   /

  281.  *  o--o

  282.  */

  283. 

  284. static int rv34_decode_block(int16_t *dst, GetBitContext *gb, RV34VLC *rvlc, int fc, int sc, int q_dc, int q_ac1, int q_ac2)

  285. {

  286.     int code, pattern, has_ac = 1;

  287. 

  288.     code = get_vlc2(gb, rvlc->first_pattern[fc].table, 9, 2);

  289. 

  290.     pattern = code & 0x7;

  291. 

  292.     code >>= 3;

  293. 

  294.     if (modulo_three_table[code] & 0x3F) {

  295.         decode_subblock3(dst, code, gb, &rvlc->coefficient, q_dc, q_ac1, q_ac2);

  296.     } else {

  297.         decode_subblock1(dst, code, gb, &rvlc->coefficient, q_dc);

  298.         if (!pattern)

  299.             return 0;

  300.         has_ac = 0;

  301.     }

  302. 

  303.     if(pattern & 4){

  304.         code = get_vlc2(gb, rvlc->second_pattern[sc].table, 9, 2);

  305.         decode_subblock(dst + 4*0+2, code, 0, gb, &rvlc->coefficient, q_ac2);

  306.     }

  307.     if(pattern & 2){ // Looks like coefficients 1 and 2 are swapped for this block

  308.         code = get_vlc2(gb, rvlc->second_pattern[sc].table, 9, 2);

  309.         decode_subblock(dst + 4*2+0, code, 1, gb, &rvlc->coefficient, q_ac2);

  310.     }

  311.     if(pattern & 1){

  312.         code = get_vlc2(gb, rvlc->third_pattern[sc].table, 9, 2);

  313.         decode_subblock(dst + 4*2+2, code, 0, gb, &rvlc->coefficient, q_ac2);

  314.     }

  315.     return has_ac | pattern;

  316. }

  317. 

  318. /**

  319.  * @name RV30/40 bitstream parsing

  320.  * @{

  321.  */

  322. 

  323. /**

  324.  * Decode starting slice position.

  325.  * @todo Maybe replace with ff_h263_decode_mba() ?

  326.  */

  327. int ff_rv34_get_start_offset(GetBitContext *gb, int mb_size)

  328. {

  329.     int i;

  330.     for(i = 0; i < 5; i++)

  331.         if(rv34_mb_max_sizes[i] >= mb_size - 1)

  332.             break;

  333.     return rv34_mb_bits_sizes[i];

  334. }

  335. 

  336. /**

  337.  * Select VLC set for decoding from current quantizer, modifier and frame type.

  338.  */

  339. static inline RV34VLC* choose_vlc_set(int quant, int mod, int type)

  340. {

  341.     if(mod == 2 && quant < 19) quant += 10;

  342.     else if(mod && quant < 26) quant += 5;

  343.     return type ? &inter_vlcs[rv34_quant_to_vlc_set[1][av_clip(quant, 0, 30)]]

  344.                 : &intra_vlcs[rv34_quant_to_vlc_set[0][av_clip(quant, 0, 30)]];

  345. }

  346. 

  347. /**

  348.  * Decode intra macroblock header and return CBP in case of success, -1 otherwise.

  349.  */

  350. static int rv34_decode_intra_mb_header(RV34DecContext *r, int8_t *intra_types)

  351. {

  352.     MpegEncContext *s = &r->s;

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

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

  355.     int t;

  356. 

  357.     r->is16 = get_bits1(gb);

  358.     if(r->is16){

  359.         s->current_picture_ptr->mb_type[mb_pos] = MB_TYPE_INTRA16x16;

  360.         r->block_type = RV34_MB_TYPE_INTRA16x16;

  361.         t = get_bits(gb, 2);

  362.         fill_rectangle(intra_types, 4, 4, r->intra_types_stride, t, sizeof(intra_types[0]));

  363.         r->luma_vlc   = 2;

  364.     }else{

  365.         if(!r->rv30){

  366.             if(!get_bits1(gb))

  367.                 av_log(s->avctx, AV_LOG_ERROR, "Need DQUANT\n");

  368.         }

  369.         s->current_picture_ptr->mb_type[mb_pos] = MB_TYPE_INTRA;

  370.         r->block_type = RV34_MB_TYPE_INTRA;

  371.         if(r->decode_intra_types(r, gb, intra_types) < 0)

  372.             return -1;

  373.         r->luma_vlc   = 1;

  374.     }

  375. 

  376.     r->chroma_vlc = 0;

  377.     r->cur_vlcs   = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);

  378. 

  379.     return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);

  380. }

  381. 

  382. /**

  383.  * Decode inter macroblock header and return CBP in case of success, -1 otherwise.

  384.  */

  385. static int rv34_decode_inter_mb_header(RV34DecContext *r, int8_t *intra_types)

  386. {

  387.     MpegEncContext *s = &r->s;

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

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

  390.     int i, t;

  391. 

  392.     r->block_type = r->decode_mb_info(r);

  393.     if(r->block_type == -1)

  394.         return -1;

  395.     s->current_picture_ptr->mb_type[mb_pos] = rv34_mb_type_to_lavc[r->block_type];

  396.     r->mb_type[mb_pos] = r->block_type;

  397.     if(r->block_type == RV34_MB_SKIP){

  398.         if(s->pict_type == AV_PICTURE_TYPE_P)

  399.             r->mb_type[mb_pos] = RV34_MB_P_16x16;

  400.         if(s->pict_type == AV_PICTURE_TYPE_B)

  401.             r->mb_type[mb_pos] = RV34_MB_B_DIRECT;

  402.     }

  403.     r->is16 = !!IS_INTRA16x16(s->current_picture_ptr->mb_type[mb_pos]);

  404.     rv34_decode_mv(r, r->block_type);

  405.     if(r->block_type == RV34_MB_SKIP){

  406.         fill_rectangle(intra_types, 4, 4, r->intra_types_stride, 0, sizeof(intra_types[0]));

  407.         return 0;

  408.     }

  409.     r->chroma_vlc = 1;

  410.     r->luma_vlc   = 0;

  411. 

  412.     if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){

  413.         if(r->is16){

  414.             t = get_bits(gb, 2);

  415.             fill_rectangle(intra_types, 4, 4, r->intra_types_stride, t, sizeof(intra_types[0]));

  416.             r->luma_vlc   = 2;

  417.         }else{

  418.             if(r->decode_intra_types(r, gb, intra_types) < 0)

  419.                 return -1;

  420.             r->luma_vlc   = 1;

  421.         }

  422.         r->chroma_vlc = 0;

  423.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);

  424.     }else{

  425.         for(i = 0; i < 16; i++)

  426.             intra_types[(i & 3) + (i>>2) * r->intra_types_stride] = 0;

  427.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  428.         if(r->mb_type[mb_pos] == RV34_MB_P_MIX16x16){

  429.             r->is16 = 1;

  430.             r->chroma_vlc = 1;

  431.             r->luma_vlc   = 2;

  432.             r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);

  433.         }

  434.     }

  435. 

  436.     return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);

  437. }

  438. 

  439. /** @} */ //bitstream functions

  440. 

  441. /**

  442.  * @name motion vector related code (prediction, reconstruction, motion compensation)

  443.  * @{

  444.  */

  445. 

  446. /** macroblock partition width in 8x8 blocks */

  447. static const uint8_t part_sizes_w[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 2 };

  448. 

  449. /** macroblock partition height in 8x8 blocks */

  450. static const uint8_t part_sizes_h[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2 };

  451. 

  452. /** availability index for subblocks */

  453. static const uint8_t avail_indexes[4] = { 6, 7, 10, 11 };

  454. 

  455. /**

  456.  * motion vector prediction

  457.  *

  458.  * Motion prediction performed for the block by using median prediction of

  459.  * motion vectors from the left, top and right top blocks but in corner cases

  460.  * some other vectors may be used instead.

  461.  */

  462. static void rv34_pred_mv(RV34DecContext *r, int block_type, int subblock_no, int dmv_no)

  463. {

  464.     MpegEncContext *s = &r->s;

  465.     int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;

  466.     int A[2] = {0}, B[2], C[2];

  467.     int i, j;

  468.     int mx, my;

  469.     int* avail = r->avail_cache + avail_indexes[subblock_no];

  470.     int c_off = part_sizes_w[block_type];

  471. 

  472.     mv_pos += (subblock_no & 1) + (subblock_no >> 1)*s->b8_stride;

  473.     if(subblock_no == 3)

  474.         c_off = -1;

  475. 

  476.     if(avail[-1]){

  477.         A[0] = s->current_picture_ptr->motion_val[0][mv_pos-1][0];

  478.         A[1] = s->current_picture_ptr->motion_val[0][mv_pos-1][1];

  479.     }

  480.     if(avail[-4]){

  481.         B[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][0];

  482.         B[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][1];

  483.     }else{

  484.         B[0] = A[0];

  485.         B[1] = A[1];

  486.     }

  487.     if(!avail[c_off-4]){

  488.         if(avail[-4] && (avail[-1] || r->rv30)){

  489.             C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][0];

  490.             C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][1];

  491.         }else{

  492.             C[0] = A[0];

  493.             C[1] = A[1];

  494.         }

  495.     }else{

  496.         C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+c_off][0];

  497.         C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+c_off][1];

  498.     }

  499.     mx = mid_pred(A[0], B[0], C[0]);

  500.     my = mid_pred(A[1], B[1], C[1]);

  501.     mx += r->dmv[dmv_no][0];

  502.     my += r->dmv[dmv_no][1];

  503.     for(j = 0; j < part_sizes_h[block_type]; j++){

  504.         for(i = 0; i < part_sizes_w[block_type]; i++){

  505.             s->current_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][0] = mx;

  506.             s->current_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][1] = my;

  507.         }

  508.     }

  509. }

  510. 

  511. #define GET_PTS_DIFF(a, b) ((a - b + 8192) & 0x1FFF)

  512. 

  513. /**

  514.  * Calculate motion vector component that should be added for direct blocks.

  515.  */

  516. static int calc_add_mv(RV34DecContext *r, int dir, int val)

  517. {

  518.     int mul = dir ? -r->mv_weight2 : r->mv_weight1;

  519. 

  520.     return (val * mul + 0x2000) >> 14;

  521. }

  522. 

  523. /**

  524.  * Predict motion vector for B-frame macroblock.

  525.  */

  526. static inline void rv34_pred_b_vector(int A[2], int B[2], int C[2],

  527.                                       int A_avail, int B_avail, int C_avail,

  528.                                       int *mx, int *my)

  529. {

  530.     if(A_avail + B_avail + C_avail != 3){

  531.         *mx = A[0] + B[0] + C[0];

  532.         *my = A[1] + B[1] + C[1];

  533.         if(A_avail + B_avail + C_avail == 2){

  534.             *mx /= 2;

  535.             *my /= 2;

  536.         }

  537.     }else{

  538.         *mx = mid_pred(A[0], B[0], C[0]);

  539.         *my = mid_pred(A[1], B[1], C[1]);

  540.     }

  541. }

  542. 

  543. /**

  544.  * motion vector prediction for B-frames

  545.  */

  546. static void rv34_pred_mv_b(RV34DecContext *r, int block_type, int dir)

  547. {

  548.     MpegEncContext *s = &r->s;

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

  550.     int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;

  551.     int A[2] = { 0 }, B[2] = { 0 }, C[2] = { 0 };

  552.     int has_A = 0, has_B = 0, has_C = 0;

  553.     int mx, my;

  554.     int i, j;

  555.     Picture *cur_pic = s->current_picture_ptr;

  556.     const int mask = dir ? MB_TYPE_L1 : MB_TYPE_L0;

  557.     int type = cur_pic->mb_type[mb_pos];

  558. 

  559.     if((r->avail_cache[6-1] & type) & mask){

  560.         A[0] = cur_pic->motion_val[dir][mv_pos - 1][0];

  561.         A[1] = cur_pic->motion_val[dir][mv_pos - 1][1];

  562.         has_A = 1;

  563.     }

  564.     if((r->avail_cache[6-4] & type) & mask){

  565.         B[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride][0];

  566.         B[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride][1];

  567.         has_B = 1;

  568.     }

  569.     if(r->avail_cache[6-4] && (r->avail_cache[6-2] & type) & mask){

  570.         C[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][0];

  571.         C[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][1];

  572.         has_C = 1;

  573.     }else if((s->mb_x+1) == s->mb_width && (r->avail_cache[6-5] & type) & mask){

  574.         C[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride - 1][0];

  575.         C[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride - 1][1];

  576.         has_C = 1;

  577.     }

  578. 

  579.     rv34_pred_b_vector(A, B, C, has_A, has_B, has_C, &mx, &my);

  580. 

  581.     mx += r->dmv[dir][0];

  582.     my += r->dmv[dir][1];

  583. 

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

  585.         for(i = 0; i < 2; i++){

  586.             cur_pic->motion_val[dir][mv_pos + i + j*s->b8_stride][0] = mx;

  587.             cur_pic->motion_val[dir][mv_pos + i + j*s->b8_stride][1] = my;

  588.         }

  589.     }

  590.     if(block_type == RV34_MB_B_BACKWARD || block_type == RV34_MB_B_FORWARD){

  591.         ZERO8x2(cur_pic->motion_val[!dir][mv_pos], s->b8_stride);

  592.     }

  593. }

  594. 

  595. /**

  596.  * motion vector prediction - RV3 version

  597.  */

  598. static void rv34_pred_mv_rv3(RV34DecContext *r, int block_type, int dir)

  599. {

  600.     MpegEncContext *s = &r->s;

  601.     int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;

  602.     int A[2] = {0}, B[2], C[2];

  603.     int i, j, k;

  604.     int mx, my;

  605.     int* avail = r->avail_cache + avail_indexes[0];

  606. 

  607.     if(avail[-1]){

  608.         A[0] = s->current_picture_ptr->motion_val[0][mv_pos - 1][0];

  609.         A[1] = s->current_picture_ptr->motion_val[0][mv_pos - 1][1];

  610.     }

  611.     if(avail[-4]){

  612.         B[0] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride][0];

  613.         B[1] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride][1];

  614.     }else{

  615.         B[0] = A[0];

  616.         B[1] = A[1];

  617.     }

  618.     if(!avail[-4 + 2]){

  619.         if(avail[-4] && (avail[-1])){

  620.             C[0] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride - 1][0];

  621.             C[1] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride - 1][1];

  622.         }else{

  623.             C[0] = A[0];

  624.             C[1] = A[1];

  625.         }

  626.     }else{

  627.         C[0] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride + 2][0];

  628.         C[1] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride + 2][1];

  629.     }

  630.     mx = mid_pred(A[0], B[0], C[0]);

  631.     my = mid_pred(A[1], B[1], C[1]);

  632.     mx += r->dmv[0][0];

  633.     my += r->dmv[0][1];

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

  635.         for(i = 0; i < 2; i++){

  636.             for(k = 0; k < 2; k++){

  637.                 s->current_picture_ptr->motion_val[k][mv_pos + i + j*s->b8_stride][0] = mx;

  638.                 s->current_picture_ptr->motion_val[k][mv_pos + i + j*s->b8_stride][1] = my;

  639.             }

  640.         }

  641.     }

  642. }

  643. 

  644. static const int chroma_coeffs[3] = { 0, 3, 5 };

  645. 

  646. /**

  647.  * generic motion compensation function

  648.  *

  649.  * @param r decoder context

  650.  * @param block_type type of the current block

  651.  * @param xoff horizontal offset from the start of the current block

  652.  * @param yoff vertical offset from the start of the current block

  653.  * @param mv_off offset to the motion vector information

  654.  * @param width width of the current partition in 8x8 blocks

  655.  * @param height height of the current partition in 8x8 blocks

  656.  * @param dir motion compensation direction (i.e. from the last or the next reference frame)

  657.  * @param thirdpel motion vectors are specified in 1/3 of pixel

  658.  * @param qpel_mc a set of functions used to perform luma motion compensation

  659.  * @param chroma_mc a set of functions used to perform chroma motion compensation

  660.  */

  661. static inline void rv34_mc(RV34DecContext *r, const int block_type,

  662.                           const int xoff, const int yoff, int mv_off,

  663.                           const int width, const int height, int dir,

  664.                           const int thirdpel, int weighted,

  665.                           qpel_mc_func (*qpel_mc)[16],

  666.                           h264_chroma_mc_func (*chroma_mc))

  667. {

  668.     MpegEncContext *s = &r->s;

  669.     uint8_t *Y, *U, *V, *srcY, *srcU, *srcV;

  670.     int dxy, mx, my, umx, umy, lx, ly, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  671.     int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride + mv_off;

  672.     int is16x16 = 1;

  673. 

  674.     if(thirdpel){

  675.         int chroma_mx, chroma_my;

  676.         mx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + (3 << 24)) / 3 - (1 << 24);

  677.         my = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + (3 << 24)) / 3 - (1 << 24);

  678.         lx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + (3 << 24)) % 3;

  679.         ly = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + (3 << 24)) % 3;

  680.         chroma_mx = s->current_picture_ptr->motion_val[dir][mv_pos][0] / 2;

  681.         chroma_my = s->current_picture_ptr->motion_val[dir][mv_pos][1] / 2;

  682.         umx = (chroma_mx + (3 << 24)) / 3 - (1 << 24);

  683.         umy = (chroma_my + (3 << 24)) / 3 - (1 << 24);

  684.         uvmx = chroma_coeffs[(chroma_mx + (3 << 24)) % 3];

  685.         uvmy = chroma_coeffs[(chroma_my + (3 << 24)) % 3];

  686.     }else{

  687.         int cx, cy;

  688.         mx = s->current_picture_ptr->motion_val[dir][mv_pos][0] >> 2;

  689.         my = s->current_picture_ptr->motion_val[dir][mv_pos][1] >> 2;

  690.         lx = s->current_picture_ptr->motion_val[dir][mv_pos][0] & 3;

  691.         ly = s->current_picture_ptr->motion_val[dir][mv_pos][1] & 3;

  692.         cx = s->current_picture_ptr->motion_val[dir][mv_pos][0] / 2;

  693.         cy = s->current_picture_ptr->motion_val[dir][mv_pos][1] / 2;

  694.         umx = cx >> 2;

  695.         umy = cy >> 2;

  696.         uvmx = (cx & 3) << 1;

  697.         uvmy = (cy & 3) << 1;

  698.         //due to some flaw RV40 uses the same MC compensation routine for H2V2 and H3V3

  699.         if(uvmx == 6 && uvmy == 6)

  700.             uvmx = uvmy = 4;

  701.     }

  702. 

  703.     if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME)) {

  704.         /* wait for the referenced mb row to be finished */

  705.         int mb_row = s->mb_y + ((yoff + my + 5 + 8 * height) >> 4);

  706.         ThreadFrame *f = dir ? &s->next_picture_ptr->tf : &s->last_picture_ptr->tf;

  707.         ff_thread_await_progress(f, mb_row, 0);

  708.     }

  709. 

  710.     dxy = ly*4 + lx;

  711.     srcY = dir ? s->next_picture_ptr->f.data[0] : s->last_picture_ptr->f.data[0];

  712.     srcU = dir ? s->next_picture_ptr->f.data[1] : s->last_picture_ptr->f.data[1];

  713.     srcV = dir ? s->next_picture_ptr->f.data[2] : s->last_picture_ptr->f.data[2];

  714.     src_x = s->mb_x * 16 + xoff + mx;

  715.     src_y = s->mb_y * 16 + yoff + my;

  716.     uvsrc_x = s->mb_x * 8 + (xoff >> 1) + umx;

  717.     uvsrc_y = s->mb_y * 8 + (yoff >> 1) + umy;

  718.     srcY += src_y * s->linesize + src_x;

  719.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  720.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  721.     if(s->h_edge_pos - (width << 3) < 6 || s->v_edge_pos - (height << 3) < 6 ||

  722.        (unsigned)(src_x - !!lx*2) > s->h_edge_pos - !!lx*2 - (width <<3) - 4 ||

  723.        (unsigned)(src_y - !!ly*2) > s->v_edge_pos - !!ly*2 - (height<<3) - 4) {

  724.         uint8_t *uvbuf = s->edge_emu_buffer + 22 * s->linesize;

  725. 

  726.         srcY -= 2 + 2*s->linesize;

  727.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,

  728.                                  s->linesize, s->linesize,

  729.                                  (width << 3) + 6, (height << 3) + 6,

  730.                                  src_x - 2, src_y - 2,

  731.                                  s->h_edge_pos, s->v_edge_pos);

  732.         srcY = s->edge_emu_buffer + 2 + 2*s->linesize;

  733.         s->vdsp.emulated_edge_mc(uvbuf, srcU,

  734.                                  s->uvlinesize, s->uvlinesize,

  735.                                  (width << 2) + 1, (height << 2) + 1,

  736.                                  uvsrc_x, uvsrc_y,

  737.                                  s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  738.         s->vdsp.emulated_edge_mc(uvbuf + 16, srcV,

  739.                                  s->uvlinesize, s->uvlinesize,

  740.                                  (width << 2) + 1, (height << 2) + 1,

  741.                                  uvsrc_x, uvsrc_y,

  742.                                  s->h_edge_pos >> 1, s->v_edge_pos >> 1);

  743.         srcU = uvbuf;

  744.         srcV = uvbuf + 16;

  745.     }

  746.     if(!weighted){

  747.         Y = s->dest[0] + xoff      + yoff     *s->linesize;

  748.         U = s->dest[1] + (xoff>>1) + (yoff>>1)*s->uvlinesize;

  749.         V = s->dest[2] + (xoff>>1) + (yoff>>1)*s->uvlinesize;

  750.     }else{

  751.         Y = r->tmp_b_block_y [dir]     +  xoff     +  yoff    *s->linesize;

  752.         U = r->tmp_b_block_uv[dir*2]   + (xoff>>1) + (yoff>>1)*s->uvlinesize;

  753.         V = r->tmp_b_block_uv[dir*2+1] + (xoff>>1) + (yoff>>1)*s->uvlinesize;

  754.     }

  755. 

  756.     if(block_type == RV34_MB_P_16x8){

  757.         qpel_mc[1][dxy](Y, srcY, s->linesize);

  758.         Y    += 8;

  759.         srcY += 8;

  760.     }else if(block_type == RV34_MB_P_8x16){

  761.         qpel_mc[1][dxy](Y, srcY, s->linesize);

  762.         Y    += 8 * s->linesize;

  763.         srcY += 8 * s->linesize;

  764.     }

  765.     is16x16 = (block_type != RV34_MB_P_8x8) && (block_type != RV34_MB_P_16x8) && (block_type != RV34_MB_P_8x16);

  766.     qpel_mc[!is16x16][dxy](Y, srcY, s->linesize);

  767.     chroma_mc[2-width]   (U, srcU, s->uvlinesize, height*4, uvmx, uvmy);

  768.     chroma_mc[2-width]   (V, srcV, s->uvlinesize, height*4, uvmx, uvmy);

  769. }

  770. 

  771. static void rv34_mc_1mv(RV34DecContext *r, const int block_type,

  772.                         const int xoff, const int yoff, int mv_off,

  773.                         const int width, const int height, int dir)

  774. {

  775.     rv34_mc(r, block_type, xoff, yoff, mv_off, width, height, dir, r->rv30, 0,

  776.             r->rdsp.put_pixels_tab,

  777.             r->rdsp.put_chroma_pixels_tab);

  778. }

  779. 

  780. static void rv4_weight(RV34DecContext *r)

  781. {

  782.     r->rdsp.rv40_weight_pixels_tab[r->scaled_weight][0](r->s.dest[0],

  783.                                                         r->tmp_b_block_y[0],

  784.                                                         r->tmp_b_block_y[1],

  785.                                                         r->weight1,

  786.                                                         r->weight2,

  787.                                                         r->s.linesize);

  788.     r->rdsp.rv40_weight_pixels_tab[r->scaled_weight][1](r->s.dest[1],

  789.                                                         r->tmp_b_block_uv[0],

  790.                                                         r->tmp_b_block_uv[2],

  791.                                                         r->weight1,

  792.                                                         r->weight2,

  793.                                                         r->s.uvlinesize);

  794.     r->rdsp.rv40_weight_pixels_tab[r->scaled_weight][1](r->s.dest[2],

  795.                                                         r->tmp_b_block_uv[1],

  796.                                                         r->tmp_b_block_uv[3],

  797.                                                         r->weight1,

  798.                                                         r->weight2,

  799.                                                         r->s.uvlinesize);

  800. }

  801. 

  802. static void rv34_mc_2mv(RV34DecContext *r, const int block_type)

  803. {

  804.     int weighted = !r->rv30 && block_type != RV34_MB_B_BIDIR && r->weight1 != 8192;

  805. 

  806.     rv34_mc(r, block_type, 0, 0, 0, 2, 2, 0, r->rv30, weighted,

  807.             r->rdsp.put_pixels_tab,

  808.             r->rdsp.put_chroma_pixels_tab);

  809.     if(!weighted){

  810.         rv34_mc(r, block_type, 0, 0, 0, 2, 2, 1, r->rv30, 0,

  811.                 r->rdsp.avg_pixels_tab,

  812.                 r->rdsp.avg_chroma_pixels_tab);

  813.     }else{

  814.         rv34_mc(r, block_type, 0, 0, 0, 2, 2, 1, r->rv30, 1,

  815.                 r->rdsp.put_pixels_tab,

  816.                 r->rdsp.put_chroma_pixels_tab);

  817.         rv4_weight(r);

  818.     }

  819. }

  820. 

  821. static void rv34_mc_2mv_skip(RV34DecContext *r)

  822. {

  823.     int i, j;

  824.     int weighted = !r->rv30 && r->weight1 != 8192;

  825. 

  826.     for(j = 0; j < 2; j++)

  827.         for(i = 0; i < 2; i++){

  828.              rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 0, r->rv30,

  829.                      weighted,

  830.                      r->rdsp.put_pixels_tab,

  831.                      r->rdsp.put_chroma_pixels_tab);

  832.              rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 1, r->rv30,

  833.                      weighted,

  834.                      weighted ? r->rdsp.put_pixels_tab : r->rdsp.avg_pixels_tab,

  835.                      weighted ? r->rdsp.put_chroma_pixels_tab : r->rdsp.avg_chroma_pixels_tab);

  836.         }

  837.     if(weighted)

  838.         rv4_weight(r);

  839. }

  840. 

  841. /** number of motion vectors in each macroblock type */

  842. static const int num_mvs[RV34_MB_TYPES] = { 0, 0, 1, 4, 1, 1, 0, 0, 2, 2, 2, 1 };

  843. 

  844. /**

  845.  * Decode motion vector differences

  846.  * and perform motion vector reconstruction and motion compensation.

  847.  */

  848. static int rv34_decode_mv(RV34DecContext *r, int block_type)

  849. {

  850.     MpegEncContext *s = &r->s;

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

  852.     int i, j, k, l;

  853.     int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;

  854.     int next_bt;

  855. 

  856.     memset(r->dmv, 0, sizeof(r->dmv));

  857.     for(i = 0; i < num_mvs[block_type]; i++){

  858.         r->dmv[i][0] = svq3_get_se_golomb(gb);

  859.         r->dmv[i][1] = svq3_get_se_golomb(gb);

  860.     }

  861.     switch(block_type){

  862.     case RV34_MB_TYPE_INTRA:

  863.     case RV34_MB_TYPE_INTRA16x16:

  864.         ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);

  865.         return 0;

  866.     case RV34_MB_SKIP:

  867.         if(s->pict_type == AV_PICTURE_TYPE_P){

  868.             ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);

  869.             rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);

  870.             break;

  871.         }

  872.     case RV34_MB_B_DIRECT:

  873.         //surprisingly, it uses motion scheme from next reference frame

  874.         /* wait for the current mb row to be finished */

  875.         if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))

  876.             ff_thread_await_progress(&s->next_picture_ptr->tf, FFMAX(0, s->mb_y-1), 0);

  877. 

  878.         next_bt = s->next_picture_ptr->mb_type[s->mb_x + s->mb_y * s->mb_stride];

  879.         if(IS_INTRA(next_bt) || IS_SKIP(next_bt)){

  880.             ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);

  881.             ZERO8x2(s->current_picture_ptr->motion_val[1][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);

  882.         }else

  883.             for(j = 0; j < 2; j++)

  884.                 for(i = 0; i < 2; i++)

  885.                     for(k = 0; k < 2; k++)

  886.                         for(l = 0; l < 2; l++)

  887.                             s->current_picture_ptr->motion_val[l][mv_pos + i + j*s->b8_stride][k] = calc_add_mv(r, l, s->next_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][k]);

  888.         if(!(IS_16X8(next_bt) || IS_8X16(next_bt) || IS_8X8(next_bt))) //we can use whole macroblock MC

  889.             rv34_mc_2mv(r, block_type);

  890.         else

  891.             rv34_mc_2mv_skip(r);

  892.         ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);

  893.         break;

  894.     case RV34_MB_P_16x16:

  895.     case RV34_MB_P_MIX16x16:

  896.         rv34_pred_mv(r, block_type, 0, 0);

  897.         rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);

  898.         break;

  899.     case RV34_MB_B_FORWARD:

  900.     case RV34_MB_B_BACKWARD:

  901.         r->dmv[1][0] = r->dmv[0][0];

  902.         r->dmv[1][1] = r->dmv[0][1];

  903.         if(r->rv30)

  904.             rv34_pred_mv_rv3(r, block_type, block_type == RV34_MB_B_BACKWARD);

  905.         else

  906.             rv34_pred_mv_b  (r, block_type, block_type == RV34_MB_B_BACKWARD);

  907.         rv34_mc_1mv     (r, block_type, 0, 0, 0, 2, 2, block_type == RV34_MB_B_BACKWARD);

  908.         break;

  909.     case RV34_MB_P_16x8:

  910.     case RV34_MB_P_8x16:

  911.         rv34_pred_mv(r, block_type, 0, 0);

  912.         rv34_pred_mv(r, block_type, 1 + (block_type == RV34_MB_P_16x8), 1);

  913.         if(block_type == RV34_MB_P_16x8){

  914.             rv34_mc_1mv(r, block_type, 0, 0, 0,            2, 1, 0);

  915.             rv34_mc_1mv(r, block_type, 0, 8, s->b8_stride, 2, 1, 0);

  916.         }

  917.         if(block_type == RV34_MB_P_8x16){

  918.             rv34_mc_1mv(r, block_type, 0, 0, 0, 1, 2, 0);

  919.             rv34_mc_1mv(r, block_type, 8, 0, 1, 1, 2, 0);

  920.         }

  921.         break;

  922.     case RV34_MB_B_BIDIR:

  923.         rv34_pred_mv_b  (r, block_type, 0);

  924.         rv34_pred_mv_b  (r, block_type, 1);

  925.         rv34_mc_2mv     (r, block_type);

  926.         break;

  927.     case RV34_MB_P_8x8:

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

  929.             rv34_pred_mv(r, block_type, i, i);

  930.             rv34_mc_1mv (r, block_type, (i&1)<<3, (i&2)<<2, (i&1)+(i>>1)*s->b8_stride, 1, 1, 0);

  931.         }

  932.         break;

  933.     }

  934. 

  935.     return 0;

  936. }

  937. /** @} */ // mv group

  938. 

  939. /**

  940.  * @name Macroblock reconstruction functions

  941.  * @{

  942.  */

  943. /** mapping of RV30/40 intra prediction types to standard H.264 types */

  944. static const int ittrans[9] = {

  945.  DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,

  946.  VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,

  947. };

  948. 

  949. /** mapping of RV30/40 intra 16x16 prediction types to standard H.264 types */

  950. static const int ittrans16[4] = {

  951.  DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,

  952. };

  953. 

  954. /**

  955.  * Perform 4x4 intra prediction.

  956.  */

  957. static void rv34_pred_4x4_block(RV34DecContext *r, uint8_t *dst, int stride, int itype, int up, int left, int down, int right)

  958. {

  959.     uint8_t *prev = dst - stride + 4;

  960.     uint32_t topleft;

  961. 

  962.     if(!up && !left)

  963.         itype = DC_128_PRED;

  964.     else if(!up){

  965.         if(itype == VERT_PRED) itype = HOR_PRED;

  966.         if(itype == DC_PRED)   itype = LEFT_DC_PRED;

  967.     }else if(!left){

  968.         if(itype == HOR_PRED)  itype = VERT_PRED;

  969.         if(itype == DC_PRED)   itype = TOP_DC_PRED;

  970.         if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;

  971.     }

  972.     if(!down){

  973.         if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;

  974.         if(itype == HOR_UP_PRED) itype = HOR_UP_PRED_RV40_NODOWN;

  975.         if(itype == VERT_LEFT_PRED) itype = VERT_LEFT_PRED_RV40_NODOWN;

  976.     }

  977.     if(!right && up){

  978.         topleft = dst[-stride + 3] * 0x01010101u;

  979.         prev = (uint8_t*)&topleft;

  980.     }

  981.     r->h.pred4x4[itype](dst, prev, stride);

  982. }

  983. 

  984. static inline int adjust_pred16(int itype, int up, int left)

  985. {

  986.     if(!up && !left)

  987.         itype = DC_128_PRED8x8;

  988.     else if(!up){

  989.         if(itype == PLANE_PRED8x8)itype = HOR_PRED8x8;

  990.         if(itype == VERT_PRED8x8) itype = HOR_PRED8x8;

  991.         if(itype == DC_PRED8x8)   itype = LEFT_DC_PRED8x8;

  992.     }else if(!left){

  993.         if(itype == PLANE_PRED8x8)itype = VERT_PRED8x8;

  994.         if(itype == HOR_PRED8x8)  itype = VERT_PRED8x8;

  995.         if(itype == DC_PRED8x8)   itype = TOP_DC_PRED8x8;

  996.     }

  997.     return itype;

  998. }

  999. 

  1000. static inline void rv34_process_block(RV34DecContext *r,

  1001.                                       uint8_t *pdst, int stride,

  1002.                                       int fc, int sc, int q_dc, int q_ac)

  1003. {

  1004.     MpegEncContext *s = &r->s;

  1005.     int16_t *ptr = s->block[0];

  1006.     int has_ac = rv34_decode_block(ptr, &s->gb, r->cur_vlcs,

  1007.                                    fc, sc, q_dc, q_ac, q_ac);

  1008.     if(has_ac){

  1009.         r->rdsp.rv34_idct_add(pdst, stride, ptr);

  1010.     }else{

  1011.         r->rdsp.rv34_idct_dc_add(pdst, stride, ptr[0]);

  1012.         ptr[0] = 0;

  1013.     }

  1014. }

  1015. 

  1016. static void rv34_output_i16x16(RV34DecContext *r, int8_t *intra_types, int cbp)

  1017. {

  1018.     LOCAL_ALIGNED_16(int16_t, block16, [16]);

  1019.     MpegEncContext *s    = &r->s;

  1020.     GetBitContext  *gb   = &s->gb;

  1021.     int             q_dc = rv34_qscale_tab[ r->luma_dc_quant_i[s->qscale] ],

  1022.                     q_ac = rv34_qscale_tab[s->qscale];

  1023.     uint8_t        *dst  = s->dest[0];

  1024.     int16_t        *ptr  = s->block[0];

  1025.     int i, j, itype, has_ac;

  1026. 

  1027.     memset(block16, 0, 16 * sizeof(*block16));

  1028. 

  1029.     has_ac = rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0, q_dc, q_dc, q_ac);

  1030.     if(has_ac)

  1031.         r->rdsp.rv34_inv_transform(block16);

  1032.     else

  1033.         r->rdsp.rv34_inv_transform_dc(block16);

  1034. 

  1035.     itype = ittrans16[intra_types[0]];

  1036.     itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);

  1037.     r->h.pred16x16[itype](dst, s->linesize);

  1038. 

  1039.     for(j = 0; j < 4; j++){

  1040.         for(i = 0; i < 4; i++, cbp >>= 1){

  1041.             int dc = block16[i + j*4];

  1042. 

  1043.             if(cbp & 1){

  1044.                 has_ac = rv34_decode_block(ptr, gb, r->cur_vlcs, r->luma_vlc, 0, q_ac, q_ac, q_ac);

  1045.             }else

  1046.                 has_ac = 0;

  1047. 

  1048.             if(has_ac){

  1049.                 ptr[0] = dc;

  1050.                 r->rdsp.rv34_idct_add(dst+4*i, s->linesize, ptr);

  1051.             }else

  1052.                 r->rdsp.rv34_idct_dc_add(dst+4*i, s->linesize, dc);

  1053.         }

  1054. 

  1055.         dst += 4*s->linesize;

  1056.     }

  1057. 

  1058.     itype = ittrans16[intra_types[0]];

  1059.     if(itype == PLANE_PRED8x8) itype = DC_PRED8x8;

  1060.     itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);

  1061. 

  1062.     q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];

  1063.     q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];

  1064. 

  1065.     for(j = 1; j < 3; j++){

  1066.         dst = s->dest[j];

  1067.         r->h.pred8x8[itype](dst, s->uvlinesize);

  1068.         for(i = 0; i < 4; i++, cbp >>= 1){

  1069.             uint8_t *pdst;

  1070.             if(!(cbp & 1)) continue;

  1071.             pdst   = dst + (i&1)*4 + (i&2)*2*s->uvlinesize;

  1072. 

  1073.             rv34_process_block(r, pdst, s->uvlinesize,

  1074.                                r->chroma_vlc, 1, q_dc, q_ac);

  1075.         }

  1076.     }

  1077. }

  1078. 

  1079. static void rv34_output_intra(RV34DecContext *r, int8_t *intra_types, int cbp)

  1080. {

  1081.     MpegEncContext *s   = &r->s;

  1082.     uint8_t        *dst = s->dest[0];

  1083.     int      avail[6*8] = {0};

  1084.     int i, j, k;

  1085.     int idx, q_ac, q_dc;

  1086. 

  1087.     // Set neighbour information.

  1088.     if(r->avail_cache[1])

  1089.         avail[0] = 1;

  1090.     if(r->avail_cache[2])

  1091.         avail[1] = avail[2] = 1;

  1092.     if(r->avail_cache[3])

  1093.         avail[3] = avail[4] = 1;

  1094.     if(r->avail_cache[4])

  1095.         avail[5] = 1;

  1096.     if(r->avail_cache[5])

  1097.         avail[8] = avail[16] = 1;

  1098.     if(r->avail_cache[9])

  1099.         avail[24] = avail[32] = 1;

  1100. 

  1101.     q_ac = rv34_qscale_tab[s->qscale];

  1102.     for(j = 0; j < 4; j++){

  1103.         idx = 9 + j*8;

  1104.         for(i = 0; i < 4; i++, cbp >>= 1, dst += 4, idx++){

  1105.             rv34_pred_4x4_block(r, dst, s->linesize, ittrans[intra_types[i]], avail[idx-8], avail[idx-1], avail[idx+7], avail[idx-7]);

  1106.             avail[idx] = 1;

  1107.             if(!(cbp & 1)) continue;

  1108. 

  1109.             rv34_process_block(r, dst, s->linesize,

  1110.                                r->luma_vlc, 0, q_ac, q_ac);

  1111.         }

  1112.         dst += s->linesize * 4 - 4*4;

  1113.         intra_types += r->intra_types_stride;

  1114.     }

  1115. 

  1116.     intra_types -= r->intra_types_stride * 4;

  1117. 

  1118.     q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];

  1119.     q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];

  1120. 

  1121.     for(k = 0; k < 2; k++){

  1122.         dst = s->dest[1+k];

  1123.         fill_rectangle(r->avail_cache + 6, 2, 2, 4, 0, 4);

  1124. 

  1125.         for(j = 0; j < 2; j++){

  1126.             int* acache = r->avail_cache + 6 + j*4;

  1127.             for(i = 0; i < 2; i++, cbp >>= 1, acache++){

  1128.                 int itype = ittrans[intra_types[i*2+j*2*r->intra_types_stride]];

  1129.                 rv34_pred_4x4_block(r, dst+4*i, s->uvlinesize, itype, acache[-4], acache[-1], !i && !j, acache[-3]);

  1130.                 acache[0] = 1;

  1131. 

  1132.                 if(!(cbp&1)) continue;

  1133. 

  1134.                 rv34_process_block(r, dst + 4*i, s->uvlinesize,

  1135.                                    r->chroma_vlc, 1, q_dc, q_ac);

  1136.             }

  1137. 

  1138.             dst += 4*s->uvlinesize;

  1139.         }

  1140.     }

  1141. }

  1142. 

  1143. static int is_mv_diff_gt_3(int16_t (*motion_val)[2], int step)

  1144. {

  1145.     int d;

  1146.     d = motion_val[0][0] - motion_val[-step][0];

  1147.     if(d < -3 || d > 3)

  1148.         return 1;

  1149.     d = motion_val[0][1] - motion_val[-step][1];

  1150.     if(d < -3 || d > 3)

  1151.         return 1;

  1152.     return 0;

  1153. }

  1154. 

  1155. static int rv34_set_deblock_coef(RV34DecContext *r)

  1156. {

  1157.     MpegEncContext *s = &r->s;

  1158.     int hmvmask = 0, vmvmask = 0, i, j;

  1159.     int midx = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;

  1160.     int16_t (*motion_val)[2] = &s->current_picture_ptr->motion_val[0][midx];

  1161.     for(j = 0; j < 16; j += 8){

  1162.         for(i = 0; i < 2; i++){

  1163.             if(is_mv_diff_gt_3(motion_val + i, 1))

  1164.                 vmvmask |= 0x11 << (j + i*2);

  1165.             if((j || s->mb_y) && is_mv_diff_gt_3(motion_val + i, s->b8_stride))

  1166.                 hmvmask |= 0x03 << (j + i*2);

  1167.         }

  1168.         motion_val += s->b8_stride;

  1169.     }

  1170.     if(s->first_slice_line)

  1171.         hmvmask &= ~0x000F;

  1172.     if(!s->mb_x)

  1173.         vmvmask &= ~0x1111;

  1174.     if(r->rv30){ //RV30 marks both subblocks on the edge for filtering

  1175.         vmvmask |= (vmvmask & 0x4444) >> 1;

  1176.         hmvmask |= (hmvmask & 0x0F00) >> 4;

  1177.         if(s->mb_x)

  1178.             r->deblock_coefs[s->mb_x - 1 + s->mb_y*s->mb_stride] |= (vmvmask & 0x1111) << 3;

  1179.         if(!s->first_slice_line)

  1180.             r->deblock_coefs[s->mb_x + (s->mb_y - 1)*s->mb_stride] |= (hmvmask & 0xF) << 12;

  1181.     }

  1182.     return hmvmask | vmvmask;

  1183. }

  1184. 

  1185. static int rv34_decode_inter_macroblock(RV34DecContext *r, int8_t *intra_types)

  1186. {

  1187.     MpegEncContext *s   = &r->s;

  1188.     GetBitContext  *gb  = &s->gb;

  1189.     uint8_t        *dst = s->dest[0];

  1190.     int16_t        *ptr = s->block[0];

  1191.     int          mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1192.     int cbp, cbp2;

  1193.     int q_dc, q_ac, has_ac;

  1194.     int i, j;

  1195.     int dist;

  1196. 

  1197.     // Calculate which neighbours are available. Maybe it's worth optimizing too.

  1198.     memset(r->avail_cache, 0, sizeof(r->avail_cache));

  1199.     fill_rectangle(r->avail_cache + 6, 2, 2, 4, 1, 4);

  1200.     dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;

  1201.     if(s->mb_x && dist)

  1202.         r->avail_cache[5] =

  1203.         r->avail_cache[9] = s->current_picture_ptr->mb_type[mb_pos - 1];

  1204.     if(dist >= s->mb_width)

  1205.         r->avail_cache[2] =

  1206.         r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];

  1207.     if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)

  1208.         r->avail_cache[4] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];

  1209.     if(s->mb_x && dist > s->mb_width)

  1210.         r->avail_cache[1] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];

  1211. 

  1212.     s->qscale = r->si.quant;

  1213.     cbp = cbp2 = rv34_decode_inter_mb_header(r, intra_types);

  1214.     r->cbp_luma  [mb_pos] = cbp;

  1215.     r->cbp_chroma[mb_pos] = cbp >> 16;

  1216.     r->deblock_coefs[mb_pos] = rv34_set_deblock_coef(r) | r->cbp_luma[mb_pos];

  1217.     s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;

  1218. 

  1219.     if(cbp == -1)

  1220.         return -1;

  1221. 

  1222.     if (IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){

  1223.         if(r->is16) rv34_output_i16x16(r, intra_types, cbp);

  1224.         else        rv34_output_intra(r, intra_types, cbp);

  1225.         return 0;

  1226.     }

  1227. 

  1228.     if(r->is16){

  1229.         // Only for RV34_MB_P_MIX16x16

  1230.         LOCAL_ALIGNED_16(int16_t, block16, [16]);

  1231.         memset(block16, 0, 16 * sizeof(*block16));

  1232.         q_dc = rv34_qscale_tab[ r->luma_dc_quant_p[s->qscale] ];

  1233.         q_ac = rv34_qscale_tab[s->qscale];

  1234.         if (rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0, q_dc, q_dc, q_ac))

  1235.             r->rdsp.rv34_inv_transform(block16);

  1236.         else

  1237.             r->rdsp.rv34_inv_transform_dc(block16);

  1238. 

  1239.         q_ac = rv34_qscale_tab[s->qscale];

  1240. 

  1241.         for(j = 0; j < 4; j++){

  1242.             for(i = 0; i < 4; i++, cbp >>= 1){

  1243.                 int      dc   = block16[i + j*4];

  1244. 

  1245.                 if(cbp & 1){

  1246.                     has_ac = rv34_decode_block(ptr, gb, r->cur_vlcs, r->luma_vlc, 0, q_ac, q_ac, q_ac);

  1247.                 }else

  1248.                     has_ac = 0;

  1249. 

  1250.                 if(has_ac){

  1251.                     ptr[0] = dc;

  1252.                     r->rdsp.rv34_idct_add(dst+4*i, s->linesize, ptr);

  1253.                 }else

  1254.                     r->rdsp.rv34_idct_dc_add(dst+4*i, s->linesize, dc);

  1255.             }

  1256. 

  1257.             dst += 4*s->linesize;

  1258.         }

  1259. 

  1260.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1261.     }else{

  1262.         q_ac = rv34_qscale_tab[s->qscale];

  1263. 

  1264.         for(j = 0; j < 4; j++){

  1265.             for(i = 0; i < 4; i++, cbp >>= 1){

  1266.                 if(!(cbp & 1)) continue;

  1267. 

  1268.                 rv34_process_block(r, dst + 4*i, s->linesize,

  1269.                                    r->luma_vlc, 0, q_ac, q_ac);

  1270.             }

  1271.             dst += 4*s->linesize;

  1272.         }

  1273.     }

  1274. 

  1275.     q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];

  1276.     q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];

  1277. 

  1278.     for(j = 1; j < 3; j++){

  1279.         dst = s->dest[j];

  1280.         for(i = 0; i < 4; i++, cbp >>= 1){

  1281.             uint8_t *pdst;

  1282.             if(!(cbp & 1)) continue;

  1283.             pdst = dst + (i&1)*4 + (i&2)*2*s->uvlinesize;

  1284. 

  1285.             rv34_process_block(r, pdst, s->uvlinesize,

  1286.                                r->chroma_vlc, 1, q_dc, q_ac);

  1287.         }

  1288.     }

  1289. 

  1290.     return 0;

  1291. }

  1292. 

  1293. static int rv34_decode_intra_macroblock(RV34DecContext *r, int8_t *intra_types)

  1294. {

  1295.     MpegEncContext *s = &r->s;

  1296.     int cbp, dist;

  1297.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1298. 

  1299.     // Calculate which neighbours are available. Maybe it's worth optimizing too.

  1300.     memset(r->avail_cache, 0, sizeof(r->avail_cache));

  1301.     fill_rectangle(r->avail_cache + 6, 2, 2, 4, 1, 4);

  1302.     dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;

  1303.     if(s->mb_x && dist)

  1304.         r->avail_cache[5] =

  1305.         r->avail_cache[9] = s->current_picture_ptr->mb_type[mb_pos - 1];

  1306.     if(dist >= s->mb_width)

  1307.         r->avail_cache[2] =

  1308.         r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];

  1309.     if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)

  1310.         r->avail_cache[4] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];

  1311.     if(s->mb_x && dist > s->mb_width)

  1312.         r->avail_cache[1] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];

  1313. 

  1314.     s->qscale = r->si.quant;

  1315.     cbp = rv34_decode_intra_mb_header(r, intra_types);

  1316.     r->cbp_luma  [mb_pos] = cbp;

  1317.     r->cbp_chroma[mb_pos] = cbp >> 16;

  1318.     r->deblock_coefs[mb_pos] = 0xFFFF;

  1319.     s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;

  1320. 

  1321.     if(cbp == -1)

  1322.         return -1;

  1323. 

  1324.     if(r->is16){

  1325.         rv34_output_i16x16(r, intra_types, cbp);

  1326.         return 0;

  1327.     }

  1328. 

  1329.     rv34_output_intra(r, intra_types, cbp);

  1330.     return 0;

  1331. }

  1332. 

  1333. static int check_slice_end(RV34DecContext *r, MpegEncContext *s)

  1334. {

  1335.     int bits;

  1336.     if(s->mb_y >= s->mb_height)

  1337.         return 1;

  1338.     if(!s->mb_num_left)

  1339.         return 1;

  1340.     if(r->s.mb_skip_run > 1)

  1341.         return 0;

  1342.     bits = get_bits_left(&s->gb);

  1343.     if(bits <= 0 || (bits < 8 && !show_bits(&s->gb, bits)))

  1344.         return 1;

  1345.     return 0;

  1346. }

  1347. 

  1348. 

  1349. static void rv34_decoder_free(RV34DecContext *r)

  1350. {

  1351.     av_freep(&r->intra_types_hist);

  1352.     r->intra_types = NULL;

  1353.     av_freep(&r->tmp_b_block_base);

  1354.     av_freep(&r->mb_type);

  1355.     av_freep(&r->cbp_luma);

  1356.     av_freep(&r->cbp_chroma);

  1357.     av_freep(&r->deblock_coefs);

  1358. }

  1359. 

  1360. 

  1361. static int rv34_decoder_alloc(RV34DecContext *r)

  1362. {

  1363.     r->intra_types_stride = r->s.mb_width * 4 + 4;

  1364. 

  1365.     r->cbp_chroma       = av_mallocz(r->s.mb_stride * r->s.mb_height *

  1366.                                     sizeof(*r->cbp_chroma));

  1367.     r->cbp_luma         = av_mallocz(r->s.mb_stride * r->s.mb_height *

  1368.                                     sizeof(*r->cbp_luma));

  1369.     r->deblock_coefs    = av_mallocz(r->s.mb_stride * r->s.mb_height *

  1370.                                     sizeof(*r->deblock_coefs));

  1371.     r->intra_types_hist = av_malloc(r->intra_types_stride * 4 * 2 *

  1372.                                     sizeof(*r->intra_types_hist));

  1373.     r->mb_type          = av_mallocz(r->s.mb_stride * r->s.mb_height *

  1374.                                      sizeof(*r->mb_type));

  1375. 

  1376.     if (!(r->cbp_chroma       && r->cbp_luma && r->deblock_coefs &&

  1377.           r->intra_types_hist && r->mb_type)) {

  1378.         rv34_decoder_free(r);

  1379.         return AVERROR(ENOMEM);

  1380.     }

  1381. 

  1382.     r->intra_types = r->intra_types_hist + r->intra_types_stride * 4;

  1383. 

  1384.     return 0;

  1385. }

  1386. 

  1387. 

  1388. static int rv34_decoder_realloc(RV34DecContext *r)

  1389. {

  1390.     rv34_decoder_free(r);

  1391.     return rv34_decoder_alloc(r);

  1392. }

  1393. 

  1394. 

  1395. static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int buf_size)

  1396. {

  1397.     MpegEncContext *s = &r->s;

  1398.     GetBitContext *gb = &s->gb;

  1399.     int mb_pos, slice_type;

  1400.     int res;

  1401. 

  1402.     init_get_bits(&r->s.gb, buf, buf_size*8);

  1403.     res = r->parse_slice_header(r, gb, &r->si);

  1404.     if(res < 0){

  1405.         av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");

  1406.         return -1;

  1407.     }

  1408. 

  1409.     slice_type = r->si.type ? r->si.type : AV_PICTURE_TYPE_I;

  1410.     if (slice_type != s->pict_type) {

  1411.         av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");

  1412.         return AVERROR_INVALIDDATA;

  1413.     }

  1414.     if (s->width != r->si.width || s->height != r->si.height) {

  1415.         av_log(s->avctx, AV_LOG_ERROR, "Size mismatch\n");

  1416.         return AVERROR_INVALIDDATA;

  1417.     }

  1418. 

  1419.     r->si.end = end;

  1420.     s->qscale = r->si.quant;

  1421.     s->mb_num_left = r->si.end - r->si.start;

  1422.     r->s.mb_skip_run = 0;

  1423. 

  1424.     mb_pos = s->mb_x + s->mb_y * s->mb_width;

  1425.     if(r->si.start != mb_pos){

  1426.         av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);

  1427.         s->mb_x = r->si.start % s->mb_width;

  1428.         s->mb_y = r->si.start / s->mb_width;

  1429.     }

  1430.     memset(r->intra_types_hist, -1, r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1431.     s->first_slice_line = 1;

  1432.     s->resync_mb_x = s->mb_x;

  1433.     s->resync_mb_y = s->mb_y;

  1434. 

  1435.     ff_init_block_index(s);

  1436.     while(!check_slice_end(r, s)) {

  1437.         ff_update_block_index(s);

  1438. 

  1439.         if(r->si.type)

  1440.             res = rv34_decode_inter_macroblock(r, r->intra_types + s->mb_x * 4 + 4);

  1441.         else

  1442.             res = rv34_decode_intra_macroblock(r, r->intra_types + s->mb_x * 4 + 4);

  1443.         if(res < 0){

  1444.             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_ERROR);

  1445.             return -1;

  1446.         }

  1447.         if (++s->mb_x == s->mb_width) {

  1448.             s->mb_x = 0;

  1449.             s->mb_y++;

  1450.             ff_init_block_index(s);

  1451. 

  1452.             memmove(r->intra_types_hist, r->intra_types, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));

  1453.             memset(r->intra_types, -1, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));

  1454. 

  1455.             if(r->loop_filter && s->mb_y >= 2)

  1456.                 r->loop_filter(r, s->mb_y - 2);

  1457. 

  1458.             if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))

  1459.                 ff_thread_report_progress(&s->current_picture_ptr->tf,

  1460.                                           s->mb_y - 2, 0);

  1461. 

  1462.         }

  1463.         if(s->mb_x == s->resync_mb_x)

  1464.             s->first_slice_line=0;

  1465.         s->mb_num_left--;

  1466.     }

  1467.     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);

  1468. 

  1469.     return s->mb_y == s->mb_height;

  1470. }

  1471. 

  1472. /** @} */ // recons group end

  1473. 

  1474. /**

  1475.  * Initialize decoder.

  1476.  */

  1477. av_cold int ff_rv34_decode_init(AVCodecContext *avctx)

  1478. {

  1479.     RV34DecContext *r = avctx->priv_data;

  1480.     MpegEncContext *s = &r->s;

  1481.     int ret;

  1482. 

  1483.     ff_MPV_decode_defaults(s);

  1484.     s->avctx      = avctx;

  1485.     s->out_format = FMT_H263;

  1486.     s->codec_id   = avctx->codec_id;

  1487. 

  1488.     s->width  = avctx->width;

  1489.     s->height = avctx->height;

  1490. 

  1491.     r->s.avctx = avctx;

  1492.     avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  1493.     avctx->has_b_frames = 1;

  1494.     s->low_delay = 0;

  1495. 

  1496.     if ((ret = ff_MPV_common_init(s)) < 0)

  1497.         return ret;

  1498. 

  1499.     ff_h264_pred_init(&r->h, AV_CODEC_ID_RV40, 8, 1);

  1500. 

  1501. #if CONFIG_RV30_DECODER

  1502.     if (avctx->codec_id == AV_CODEC_ID_RV30)

  1503.         ff_rv30dsp_init(&r->rdsp);

  1504. #endif

  1505. #if CONFIG_RV40_DECODER

  1506.     if (avctx->codec_id == AV_CODEC_ID_RV40)

  1507.         ff_rv40dsp_init(&r->rdsp);

  1508. #endif

  1509. 

  1510.     if ((ret = rv34_decoder_alloc(r)) < 0) {

  1511.         ff_MPV_common_end(&r->s);

  1512.         return ret;

  1513.     }

  1514. 

  1515.     if(!intra_vlcs[0].cbppattern[0].bits)

  1516.         rv34_init_tables();

  1517. 

  1518.     avctx->internal->allocate_progress = 1;

  1519. 

  1520.     return 0;

  1521. }

  1522. 

  1523. int ff_rv34_decode_init_thread_copy(AVCodecContext *avctx)

  1524. {

  1525.     int err;

  1526.     RV34DecContext *r = avctx->priv_data;

  1527. 

  1528.     r->s.avctx = avctx;

  1529. 

  1530.     if (avctx->internal->is_copy) {

  1531.         r->tmp_b_block_base = NULL;

  1532.         if ((err = ff_MPV_common_init(&r->s)) < 0)

  1533.             return err;

  1534.         if ((err = rv34_decoder_alloc(r)) < 0) {

  1535.             ff_MPV_common_end(&r->s);

  1536.             return err;

  1537.         }

  1538.     }

  1539. 

  1540.     return 0;

  1541. }

  1542. 

  1543. int ff_rv34_decode_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)

  1544. {

  1545.     RV34DecContext *r = dst->priv_data, *r1 = src->priv_data;

  1546.     MpegEncContext * const s = &r->s, * const s1 = &r1->s;

  1547.     int err;

  1548. 

  1549.     if (dst == src || !s1->context_initialized)

  1550.         return 0;

  1551. 

  1552.     if (s->height != s1->height || s->width != s1->width) {

  1553.         s->height = s1->height;

  1554.         s->width  = s1->width;

  1555.         if ((err = ff_MPV_common_frame_size_change(s)) < 0)

  1556.             return err;

  1557.         if ((err = rv34_decoder_realloc(r)) < 0)

  1558.             return err;

  1559.     }

  1560. 

  1561.     if ((err = ff_mpeg_update_thread_context(dst, src)))

  1562.         return err;

  1563. 

  1564.     r->cur_pts  = r1->cur_pts;

  1565.     r->last_pts = r1->last_pts;

  1566.     r->next_pts = r1->next_pts;

  1567. 

  1568.     memset(&r->si, 0, sizeof(r->si));

  1569. 

  1570.     return 0;

  1571. }

  1572. 

  1573. static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)

  1574. {

  1575.     if(avctx->slice_count) return avctx->slice_offset[n];

  1576.     else                   return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) :  AV_RB32(buf + n*8);

  1577. }

  1578. 

  1579. static int finish_frame(AVCodecContext *avctx, AVFrame *pict)

  1580. {

  1581.     RV34DecContext *r = avctx->priv_data;

  1582.     MpegEncContext *s = &r->s;

  1583.     int got_picture = 0, ret;

  1584. 

  1585.     ff_er_frame_end(&s->er);

  1586.     ff_MPV_frame_end(s);

  1587.     s->mb_num_left = 0;

  1588. 

  1589.     if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))

  1590.         ff_thread_report_progress(&s->current_picture_ptr->tf, INT_MAX, 0);

  1591. 

  1592.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  1593.         if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)

  1594.             return ret;

  1595.         ff_print_debug_info(s, s->current_picture_ptr, pict);

  1596.         ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);

  1597.         got_picture = 1;

  1598.     } else if (s->last_picture_ptr != NULL) {

  1599.         if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)

  1600.             return ret;

  1601.         ff_print_debug_info(s, s->last_picture_ptr, pict);

  1602.         ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);

  1603.         got_picture = 1;

  1604.     }

  1605. 

  1606.     return got_picture;

  1607. }

  1608. 

  1609. static AVRational update_sar(int old_w, int old_h, AVRational sar, int new_w, int new_h)

  1610. {

  1611.     // attempt to keep aspect during typical resolution switches

  1612.     if (!sar.num)

  1613.         sar = (AVRational){1, 1};

  1614. 

  1615.     sar = av_mul_q(sar, (AVRational){new_h * old_w, new_w * old_h});

  1616.     return sar;

  1617. }

  1618. 

  1619. int ff_rv34_decode_frame(AVCodecContext *avctx,

  1620.                             void *data, int *got_picture_ptr,

  1621.                             AVPacket *avpkt)

  1622. {

  1623.     const uint8_t *buf = avpkt->data;

  1624.     int buf_size = avpkt->size;

  1625.     RV34DecContext *r = avctx->priv_data;

  1626.     MpegEncContext *s = &r->s;

  1627.     AVFrame *pict = data;

  1628.     SliceInfo si;

  1629.     int i, ret;

  1630.     int slice_count;

  1631.     const uint8_t *slices_hdr = NULL;

  1632.     int last = 0;

  1633. 

  1634.     /* no supplementary picture */

  1635.     if (buf_size == 0) {

  1636.         /* special case for last picture */

  1637.         if (s->low_delay==0 && s->next_picture_ptr) {

  1638.             if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)

  1639.                 return ret;

  1640.             s->next_picture_ptr = NULL;

  1641. 

  1642.             *got_picture_ptr = 1;

  1643.         }

  1644.         return 0;

  1645.     }

  1646. 

  1647.     if(!avctx->slice_count){

  1648.         slice_count = (*buf++) + 1;

  1649.         slices_hdr = buf + 4;

  1650.         buf += 8 * slice_count;

  1651.         buf_size -= 1 + 8 * slice_count;

  1652.     }else

  1653.         slice_count = avctx->slice_count;

  1654. 

  1655.     //parse first slice header to check whether this frame can be decoded

  1656.     if(get_slice_offset(avctx, slices_hdr, 0) < 0 ||

  1657.        get_slice_offset(avctx, slices_hdr, 0) > buf_size){

  1658.         av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");

  1659.         return AVERROR_INVALIDDATA;

  1660.     }

  1661.     init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), (buf_size-get_slice_offset(avctx, slices_hdr, 0))*8);

  1662.     if(r->parse_slice_header(r, &r->s.gb, &si) < 0 || si.start){

  1663.         av_log(avctx, AV_LOG_ERROR, "First slice header is incorrect\n");

  1664.         return AVERROR_INVALIDDATA;

  1665.     }

  1666.     if ((!s->last_picture_ptr || !s->last_picture_ptr->f.data[0]) &&

  1667.         si.type == AV_PICTURE_TYPE_B) {

  1668.         av_log(avctx, AV_LOG_ERROR, "Invalid decoder state: B-frame without "

  1669.                "reference data.\n");

  1670.         return AVERROR_INVALIDDATA;

  1671.     }

  1672.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && si.type==AV_PICTURE_TYPE_B)

  1673.        || (avctx->skip_frame >= AVDISCARD_NONKEY && si.type!=AV_PICTURE_TYPE_I)

  1674.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  1675.         return avpkt->size;

  1676. 

  1677.     /* first slice */

  1678.     if (si.start == 0) {

  1679.         if (s->mb_num_left > 0) {

  1680.             av_log(avctx, AV_LOG_ERROR, "New frame but still %d MB left.\n",

  1681.                    s->mb_num_left);

  1682.             ff_er_frame_end(&s->er);

  1683.             ff_MPV_frame_end(s);

  1684.         }

  1685. 

  1686.         if (s->width != si.width || s->height != si.height) {

  1687.             int err;

  1688. 

  1689.             av_log(s->avctx, AV_LOG_WARNING, "Changing dimensions to %dx%d\n",

  1690.                    si.width, si.height);

  1691. 

  1692.             if (av_image_check_size(si.width, si.height, 0, s->avctx))

  1693.                 return AVERROR_INVALIDDATA;

  1694. 

  1695.             s->avctx->sample_aspect_ratio = update_sar(

  1696.                 s->width, s->height, s->avctx->sample_aspect_ratio,

  1697.                 si.width, si.height);

  1698.             s->width  = si.width;

  1699.             s->height = si.height;

  1700. 

  1701.             err = ff_set_dimensions(s->avctx, s->width, s->height);

  1702.             if (err < 0)

  1703.                 return err;

  1704. 

  1705.             if ((err = ff_MPV_common_frame_size_change(s)) < 0)

  1706.                 return err;

  1707.             if ((err = rv34_decoder_realloc(r)) < 0)

  1708.                 return err;

  1709.         }

  1710.         s->pict_type = si.type ? si.type : AV_PICTURE_TYPE_I;

  1711.         if (ff_MPV_frame_start(s, s->avctx) < 0)

  1712.             return -1;

  1713.         ff_mpeg_er_frame_start(s);

  1714.         if (!r->tmp_b_block_base) {

  1715.             int i;

  1716. 

  1717.             r->tmp_b_block_base = av_malloc(s->linesize * 48);

  1718.             for (i = 0; i < 2; i++)

  1719.                 r->tmp_b_block_y[i] = r->tmp_b_block_base

  1720.                                       + i * 16 * s->linesize;

  1721.             for (i = 0; i < 4; i++)

  1722.                 r->tmp_b_block_uv[i] = r->tmp_b_block_base + 32 * s->linesize

  1723.                                        + (i >> 1) * 8 * s->uvlinesize

  1724.                                        + (i &  1) * 16;

  1725.         }

  1726.         r->cur_pts = si.pts;

  1727.         if (s->pict_type != AV_PICTURE_TYPE_B) {

  1728.             r->last_pts = r->next_pts;

  1729.             r->next_pts = r->cur_pts;

  1730.         } else {

  1731.             int refdist = GET_PTS_DIFF(r->next_pts, r->last_pts);

  1732.             int dist0   = GET_PTS_DIFF(r->cur_pts,  r->last_pts);

  1733.             int dist1   = GET_PTS_DIFF(r->next_pts, r->cur_pts);

  1734. 

  1735.             if(!refdist){

  1736.                 r->mv_weight1 = r->mv_weight2 = r->weight1 = r->weight2 = 8192;

  1737.                 r->scaled_weight = 0;

  1738.             }else{

  1739.                 r->mv_weight1 = (dist0 << 14) / refdist;

  1740.                 r->mv_weight2 = (dist1 << 14) / refdist;

  1741.                 if((r->mv_weight1|r->mv_weight2) & 511){

  1742.                     r->weight1 = r->mv_weight1;

  1743.                     r->weight2 = r->mv_weight2;

  1744.                     r->scaled_weight = 0;

  1745.                 }else{

  1746.                     r->weight1 = r->mv_weight1 >> 9;

  1747.                     r->weight2 = r->mv_weight2 >> 9;

  1748.                     r->scaled_weight = 1;

  1749.                 }

  1750.             }

  1751.         }

  1752.         s->mb_x = s->mb_y = 0;

  1753.         ff_thread_finish_setup(s->avctx);

  1754.     } else if (HAVE_THREADS &&

  1755.                (s->avctx->active_thread_type & FF_THREAD_FRAME)) {

  1756.         av_log(s->avctx, AV_LOG_ERROR, "Decoder needs full frames in frame "

  1757.                "multithreading mode (start MB is %d).\n", si.start);

  1758.         return AVERROR_INVALIDDATA;

  1759.     }

  1760. 

  1761.     for(i = 0; i < slice_count; i++){

  1762.         int offset = get_slice_offset(avctx, slices_hdr, i);

  1763.         int size;

  1764.         if(i+1 == slice_count)

  1765.             size = buf_size - offset;

  1766.         else

  1767.             size = get_slice_offset(avctx, slices_hdr, i+1) - offset;

  1768. 

  1769.         if(offset < 0 || offset > buf_size){

  1770.             av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");

  1771.             break;

  1772.         }

  1773. 

  1774.         r->si.end = s->mb_width * s->mb_height;

  1775.         s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;

  1776. 

  1777.         if(i+1 < slice_count){

  1778.             if (get_slice_offset(avctx, slices_hdr, i+1) < 0 ||

  1779.                 get_slice_offset(avctx, slices_hdr, i+1) > buf_size) {

  1780.                 av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");

  1781.                 break;

  1782.             }

  1783.             init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, i+1), (buf_size-get_slice_offset(avctx, slices_hdr, i+1))*8);

  1784.             if(r->parse_slice_header(r, &r->s.gb, &si) < 0){

  1785.                 if(i+2 < slice_count)

  1786.                     size = get_slice_offset(avctx, slices_hdr, i+2) - offset;

  1787.                 else

  1788.                     size = buf_size - offset;

  1789.             }else

  1790.                 r->si.end = si.start;

  1791.         }

  1792.         if (size < 0 || size > buf_size - offset) {

  1793.             av_log(avctx, AV_LOG_ERROR, "Slice size is invalid\n");

  1794.             break;

  1795.         }

  1796.         last = rv34_decode_slice(r, r->si.end, buf + offset, size);

  1797.         if(last)

  1798.             break;

  1799.     }

  1800. 

  1801.     if (s->current_picture_ptr) {

  1802.         if (last) {

  1803.             if(r->loop_filter)

  1804.                 r->loop_filter(r, s->mb_height - 1);

  1805. 

  1806.             ret = finish_frame(avctx, pict);

  1807.             if (ret < 0)

  1808.                 return ret;

  1809.             *got_picture_ptr = ret;

  1810.         } else if (HAVE_THREADS &&

  1811.                    (s->avctx->active_thread_type & FF_THREAD_FRAME)) {

  1812.             av_log(avctx, AV_LOG_INFO, "marking unfished frame as finished\n");

  1813.             /* always mark the current frame as finished, frame-mt supports

  1814.              * only complete frames */

  1815.             ff_er_frame_end(&s->er);

  1816.             ff_MPV_frame_end(s);

  1817.             s->mb_num_left = 0;

  1818.             ff_thread_report_progress(&s->current_picture_ptr->tf, INT_MAX, 0);

  1819.             return AVERROR_INVALIDDATA;

  1820.         }

  1821.     }

  1822. 

  1823.     return avpkt->size;

  1824. }

  1825. 

  1826. av_cold int ff_rv34_decode_end(AVCodecContext *avctx)

  1827. {

  1828.     RV34DecContext *r = avctx->priv_data;

  1829. 

  1830.     ff_MPV_common_end(&r->s);

  1831.     rv34_decoder_free(r);

  1832. 

  1833.     return 0;

  1834. }