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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 Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; 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/internal.h"

  28. 

  29. #include "avcodec.h"

  30. #include "error_resilience.h"

  31. #include "golomb_legacy.h"

  32. #include "mpegutils.h"

  33. #include "mpegvideo.h"

  34. #include "internal.h"

  35. #include "mathops.h"

  36. #include "mpeg_er.h"

  37. #include "qpeldsp.h"

  38. #include "rectangle.h"

  39. #include "thread.h"

  40. 

  41. #include "rv34vlc.h"

  42. #include "rv34data.h"

  43. #include "rv34.h"

  44. 

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

  46. {

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

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

  49. }

  50. 

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

  52. static const int rv34_mb_type_to_lavc[12] = {

  53.     MB_TYPE_INTRA,

  54.     MB_TYPE_INTRA16x16              | MB_TYPE_SEPARATE_DC,

  55.     MB_TYPE_16x16   | MB_TYPE_L0,

  56.     MB_TYPE_8x8     | MB_TYPE_L0,

  57.     MB_TYPE_16x16   | MB_TYPE_L0,

  58.     MB_TYPE_16x16   | MB_TYPE_L1,

  59.     MB_TYPE_SKIP,

  60.     MB_TYPE_DIRECT2 | MB_TYPE_16x16,

  61.     MB_TYPE_16x8    | MB_TYPE_L0,

  62.     MB_TYPE_8x16    | MB_TYPE_L0,

  63.     MB_TYPE_16x16   | MB_TYPE_L0L1,

  64.     MB_TYPE_16x16   | MB_TYPE_L0    | MB_TYPE_SEPARATE_DC

  65. };

  66. 

  67. 

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

  69. 

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

  71. 

  72. /**

  73.  * @name RV30/40 VLC generating functions

  74.  * @{

  75.  */

  76. 

  77. static const int table_offs[] = {

  78.       0,   1818,   3622,   4144,   4698,   5234,   5804,   5868,   5900,   5932,

  79.    5996,   6252,   6316,   6348,   6380,   7674,   8944,  10274,  11668,  12250,

  80.   14060,  15846,  16372,  16962,  17512,  18148,  18180,  18212,  18244,  18308,

  81.   18564,  18628,  18660,  18692,  20036,  21314,  22648,  23968,  24614,  26384,

  82.   28190,  28736,  29366,  29938,  30608,  30640,  30672,  30704,  30768,  31024,

  83.   31088,  31120,  31184,  32570,  33898,  35236,  36644,  37286,  39020,  40802,

  84.   41368,  42052,  42692,  43348,  43380,  43412,  43444,  43476,  43604,  43668,

  85.   43700,  43732,  45100,  46430,  47778,  49160,  49802,  51550,  53340,  53972,

  86.   54648,  55348,  55994,  56122,  56154,  56186,  56218,  56346,  56410,  56442,

  87.   56474,  57878,  59290,  60636,  62036,  62682,  64460,  64524,  64588,  64716,

  88.   64844,  66076,  67466,  67978,  68542,  69064,  69648,  70296,  72010,  72074,

  89.   72138,  72202,  72330,  73572,  74936,  75454,  76030,  76566,  77176,  77822,

  90.   79582,  79646,  79678,  79742,  79870,  81180,  82536,  83064,  83672,  84242,

  91.   84934,  85576,  87384,  87448,  87480,  87544,  87672,  88982,  90340,  90902,

  92.   91598,  92182,  92846,  93488,  95246,  95278,  95310,  95374,  95502,  96878,

  93.   98266,  98848,  99542, 100234, 100884, 101524, 103320, 103352, 103384, 103416,

  94.  103480, 104874, 106222, 106910, 107584, 108258, 108902, 109544, 111366, 111398,

  95.  111430, 111462, 111494, 112878, 114320, 114988, 115660, 116310, 116950, 117592

  96. };

  97. 

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

  99. 

  100. /**

  101.  * Generate VLC from codeword lengths.

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

  103.  * @param size   length of input data

  104.  * @param vlc    output VLC

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

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

  107.  */

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

  109.                          const int num)

  110. {

  111.     int i;

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

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

  114.     uint8_t bits2[MAX_VLC_SIZE];

  115.     int maxbits = 0, realsize = 0;

  116. 

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

  118.         if(bits[i]){

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

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

  121.             realsize++;

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

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

  124.         }

  125.     }

  126. 

  127.     codes[0] = 0;

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

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

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

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

  132. 

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

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

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

  136.                        bits2, 1, 1,

  137.                        cw,    2, 2,

  138.                        syms,  2, 2, INIT_VLC_USE_NEW_STATIC);

  139. }

  140. 

  141. /**

  142.  * Initialize all tables.

  143.  */

  144. static av_cold void rv34_init_tables(void)

  145. {

  146.     int i, j, k;

  147. 

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

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

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

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

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

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

  154.                 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);

  155.             }

  156.         }

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

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

  159.         }

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

  161.     }

  162. 

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

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

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

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

  167.         }

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

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

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

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

  172.         }

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

  174.     }

  175. }

  176. 

  177. /** @} */ // vlc group

  178. 

  179. /**

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

  181.  * @{

  182.  */

  183. 

  184. /**

  185.  * Decode coded block pattern.

  186.  */

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

  188. {

  189.     int pattern, code, cbp=0;

  190.     int ones;

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

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

  193.     const int *curshift = shifts;

  194.     int i, t, mask;

  195. 

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

  197.     pattern = code & 0xF;

  198.     code >>= 4;

  199. 

  200.     ones = rv34_count_ones[pattern];

  201. 

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

  203.         if(pattern & mask)

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

  205.     }

  206. 

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

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

  209.         if(t == 1)

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

  211.         if(t == 2)

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

  213.     }

  214.     return cbp;

  215. }

  216. 

  217. /**

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

  219.  */

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

  221. {

  222.     if(coef){

  223.         if(coef == esc){

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

  225.             if(coef > 23){

  226.                 coef -= 23;

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

  228.             }

  229.             coef += esc;

  230.         }

  231.         if(get_bits1(gb))

  232.             coef = -coef;

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

  234.     }

  235. }

  236. 

  237. /**

  238.  * Decode 2x2 subblock of coefficients.

  239.  */

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

  241. {

  242.     int flags = modulo_three_table[code];

  243. 

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

  245.     if(is_block2){

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

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

  248.     }else{

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

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

  251.     }

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

  253. }

  254. 

  255. /**

  256.  * Decode a single coefficient.

  257.  */

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

  259. {

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

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

  262. }

  263. 

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

  265.                                     int q_dc, int q_ac1, int q_ac2)

  266. {

  267.     int flags = modulo_three_table[code];

  268. 

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

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

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

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

  273. }

  274. 

  275. /**

  276.  * Decode coefficients for 4x4 block.

  277.  *

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

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

  280.  *  o--o

  281.  *    /

  282.  *   /

  283.  *  o--o

  284.  */

  285. 

  286. 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)

  287. {

  288.     int code, pattern, has_ac = 1;

  289. 

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

  291. 

  292.     pattern = code & 0x7;

  293. 

  294.     code >>= 3;

  295. 

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

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

  298.     } else {

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

  300.         if (!pattern)

  301.             return 0;

  302.         has_ac = 0;

  303.     }

  304. 

  305.     if(pattern & 4){

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

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

  308.     }

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

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

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

  312.     }

  313.     if(pattern & 1){

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

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

  316.     }

  317.     return has_ac | pattern;

  318. }

  319. 

  320. /**

  321.  * @name RV30/40 bitstream parsing

  322.  * @{

  323.  */

  324. 

  325. /**

  326.  * Decode starting slice position.

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

  328.  */

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

  330. {

  331.     int i;

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

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

  334.             break;

  335.     return rv34_mb_bits_sizes[i];

  336. }

  337. 

  338. /**

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

  340.  */

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

  342. {

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

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

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

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

  347. }

  348. 

  349. /**

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

  351.  */

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

  353. {

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

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

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

  357.     int t;

  358. 

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

  360.     if(r->is16){

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

  362.         r->block_type = RV34_MB_TYPE_INTRA16x16;

  363.         t = get_bits(gb, 2);

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

  365.         r->luma_vlc   = 2;

  366.     }else{

  367.         if(!r->rv30){

  368.             if(!get_bits1(gb))

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

  370.         }

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

  372.         r->block_type = RV34_MB_TYPE_INTRA;

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

  374.             return -1;

  375.         r->luma_vlc   = 1;

  376.     }

  377. 

  378.     r->chroma_vlc = 0;

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

  380. 

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

  382. }

  383. 

  384. /**

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

  386.  */

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

  388. {

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

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

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

  392.     int i, t;

  393. 

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

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

  396.         return -1;

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

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

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

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

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

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

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

  404.     }

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

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

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

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

  409.         return 0;

  410.     }

  411.     r->chroma_vlc = 1;

  412.     r->luma_vlc   = 0;

  413. 

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

  415.         if(r->is16){

  416.             t = get_bits(gb, 2);

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

  418.             r->luma_vlc   = 2;

  419.         }else{

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

  421.                 return -1;

  422.             r->luma_vlc   = 1;

  423.         }

  424.         r->chroma_vlc = 0;

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

  426.     }else{

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

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

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

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

  431.             r->is16 = 1;

  432.             r->chroma_vlc = 1;

  433.             r->luma_vlc   = 2;

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

  435.         }

  436.     }

  437. 

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

  439. }

  440. 

  441. /** @} */ //bitstream functions

  442. 

  443. /**

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

  445.  * @{

  446.  */

  447. 

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

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

  450. 

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

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

  453. 

  454. /** availability index for subblocks */

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

  456. 

  457. /**

  458.  * motion vector prediction

  459.  *

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

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

  462.  * some other vectors may be used instead.

  463.  */

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

  465. {

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

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

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

  469.     int i, j;

  470.     int mx, my;

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

  472.     int c_off = part_sizes_w[block_type];

  473. 

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

  475.     if(subblock_no == 3)

  476.         c_off = -1;

  477. 

  478.     if(avail[-1]){

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

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

  481.     }

  482.     if(avail[-4]){

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

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

  485.     }else{

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

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

  488.     }

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

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

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

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

  493.         }else{

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

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

  496.         }

  497.     }else{

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

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

  500.     }

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

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

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

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

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

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

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

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

  509.         }

  510.     }

  511. }

  512. 

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

  514. 

  515. /**

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

  517.  */

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

  519. {

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

  521. 

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

  523. }

  524. 

  525. /**

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

  527.  */

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

  529.                                       int A_avail, int B_avail, int C_avail,

  530.                                       int *mx, int *my)

  531. {

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

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

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

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

  536.             *mx /= 2;

  537.             *my /= 2;

  538.         }

  539.     }else{

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

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

  542.     }

  543. }

  544. 

  545. /**

  546.  * motion vector prediction for B-frames

  547.  */

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

  549. {

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

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

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

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

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

  555.     int mx, my;

  556.     int i, j;

  557.     Picture *cur_pic = s->current_picture_ptr;

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

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

  560. 

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

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

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

  564.         has_A = 1;

  565.     }

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

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

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

  569.         has_B = 1;

  570.     }

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

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

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

  574.         has_C = 1;

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

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

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

  578.         has_C = 1;

  579.     }

  580. 

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

  582. 

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

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

  585. 

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

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

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

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

  590.         }

  591.     }

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

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

  594.     }

  595. }

  596. 

  597. /**

  598.  * motion vector prediction - RV3 version

  599.  */

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

  601. {

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

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

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

  605.     int i, j, k;

  606.     int mx, my;

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

  608. 

  609.     if(avail[-1]){

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

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

  612.     }

  613.     if(avail[-4]){

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

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

  616.     }else{

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

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

  619.     }

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

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

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

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

  624.         }else{

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

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

  627.         }

  628.     }else{

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

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

  631.     }

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

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

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

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

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

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

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

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

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

  641.             }

  642.         }

  643.     }

  644. }

  645. 

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

  647. 

  648. /**

  649.  * generic motion compensation function

  650.  *

  651.  * @param r decoder context

  652.  * @param block_type type of the current block

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

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

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

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

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

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

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

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

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

  662.  */

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

  664.                           const int xoff, const int yoff, int mv_off,

  665.                           const int width, const int height, int dir,

  666.                           const int thirdpel, int weighted,

  667.                           qpel_mc_func (*qpel_mc)[16],

  668.                           h264_chroma_mc_func (*chroma_mc))

  669. {

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

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

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

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

  674.     int is16x16 = 1;

  675. 

  676.     if(thirdpel){

  677.         int chroma_mx, chroma_my;

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

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

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

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

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

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

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

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

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

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

  688.     }else{

  689.         int cx, cy;

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

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

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

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

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

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

  696.         umx = cx >> 2;

  697.         umy = cy >> 2;

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

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

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

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

  702.             uvmx = uvmy = 4;

  703.     }

  704. 

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

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

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

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

  709.         ff_thread_await_progress(f, mb_row, 0);

  710.     }

  711. 

  712.     dxy = ly*4 + lx;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  727. 

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

  729.         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, srcY,

  730.                                  s->linesize, s->linesize,

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

  732.                             src_x - 2, src_y - 2, s->h_edge_pos, s->v_edge_pos);

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

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

  735.                                  s->uvlinesize,s->uvlinesize,

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

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

  742.         srcU = uvbuf;

  743.         srcV = uvbuf + 16;

  744.     }

  745.     if(!weighted){

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

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

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

  749.     }else{

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

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

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

  753.     }

  754. 

  755.     if(block_type == RV34_MB_P_16x8){

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

  757.         Y    += 8;

  758.         srcY += 8;

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

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

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

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

  763.     }

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

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

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

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

  768. }

  769. 

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

  771.                         const int xoff, const int yoff, int mv_off,

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

  773. {

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

  775.             r->rdsp.put_pixels_tab,

  776.             r->rdsp.put_chroma_pixels_tab);

  777. }

  778. 

  779. static void rv4_weight(RV34DecContext *r)

  780. {

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

  782.                                                         r->tmp_b_block_y[0],

  783.                                                         r->tmp_b_block_y[1],

  784.                                                         r->weight1,

  785.                                                         r->weight2,

  786.                                                         r->s.linesize);

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

  788.                                                         r->tmp_b_block_uv[0],

  789.                                                         r->tmp_b_block_uv[2],

  790.                                                         r->weight1,

  791.                                                         r->weight2,

  792.                                                         r->s.uvlinesize);

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

  794.                                                         r->tmp_b_block_uv[1],

  795.                                                         r->tmp_b_block_uv[3],

  796.                                                         r->weight1,

  797.                                                         r->weight2,

  798.                                                         r->s.uvlinesize);

  799. }

  800. 

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

  802. {

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

  804. 

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

  806.             r->rdsp.put_pixels_tab,

  807.             r->rdsp.put_chroma_pixels_tab);

  808.     if(!weighted){

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

  810.                 r->rdsp.avg_pixels_tab,

  811.                 r->rdsp.avg_chroma_pixels_tab);

  812.     }else{

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

  814.                 r->rdsp.put_pixels_tab,

  815.                 r->rdsp.put_chroma_pixels_tab);

  816.         rv4_weight(r);

  817.     }

  818. }

  819. 

  820. static void rv34_mc_2mv_skip(RV34DecContext *r)

  821. {

  822.     int i, j;

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

  824. 

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

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

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

  828.                      weighted,

  829.                      r->rdsp.put_pixels_tab,

  830.                      r->rdsp.put_chroma_pixels_tab);

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

  832.                      weighted,

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

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

  835.         }

  836.     if(weighted)

  837.         rv4_weight(r);

  838. }

  839. 

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

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

  842. 

  843. /**

  844.  * Decode motion vector differences

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

  846.  */

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

  848. {

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

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

  851.     int i, j, k, l;

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

  853.     int next_bt;

  854. 

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

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

  857.         r->dmv[i][0] = get_interleaved_se_golomb(gb);

  858.         r->dmv[i][1] = get_interleaved_se_golomb(gb);

  859.     }

  860.     switch(block_type){

  861.     case RV34_MB_TYPE_INTRA:

  862.     case RV34_MB_TYPE_INTRA16x16:

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

  864.         return 0;

  865.     case RV34_MB_SKIP:

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

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

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

  869.             break;

  870.         }

  871.     case RV34_MB_B_DIRECT:

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

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

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

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

  876. 

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

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

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

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

  881.         }else

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

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

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

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

  886.                             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]);

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

  888.             rv34_mc_2mv(r, block_type);

  889.         else

  890.             rv34_mc_2mv_skip(r);

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

  892.         break;

  893.     case RV34_MB_P_16x16:

  894.     case RV34_MB_P_MIX16x16:

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

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

  897.         break;

  898.     case RV34_MB_B_FORWARD:

  899.     case RV34_MB_B_BACKWARD:

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

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

  902.         if(r->rv30)

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

  904.         else

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

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

  907.         break;

  908.     case RV34_MB_P_16x8:

  909.     case RV34_MB_P_8x16:

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

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

  912.         if(block_type == RV34_MB_P_16x8){

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

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

  915.         }

  916.         if(block_type == RV34_MB_P_8x16){

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

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

  919.         }

  920.         break;

  921.     case RV34_MB_B_BIDIR:

  922.         rv34_pred_mv_b  (r, block_type, 0);

  923.         rv34_pred_mv_b  (r, block_type, 1);

  924.         rv34_mc_2mv     (r, block_type);

  925.         break;

  926.     case RV34_MB_P_8x8:

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

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

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

  930.         }

  931.         break;

  932.     }

  933. 

  934.     return 0;

  935. }

  936. /** @} */ // mv group

  937. 

  938. /**

  939.  * @name Macroblock reconstruction functions

  940.  * @{

  941.  */

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

  943. static const int ittrans[9] = {

  944.  DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,

  945.  VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,

  946. };

  947. 

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

  949. static const int ittrans16[4] = {

  950.  DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,

  951. };

  952. 

  953. /**

  954.  * Perform 4x4 intra prediction.

  955.  */

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

  957. {

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

  959.     uint32_t topleft;

  960. 

  961.     if(!up && !left)

  962.         itype = DC_128_PRED;

  963.     else if(!up){

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

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

  966.     }else if(!left){

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

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

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

  970.     }

  971.     if(!down){

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

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

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

  975.     }

  976.     if(!right && up){

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

  978.         prev = (uint8_t*)&topleft;

  979.     }

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

  981. }

  982. 

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

  984. {

  985.     if(!up && !left)

  986.         itype = DC_128_PRED8x8;

  987.     else if(!up){

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

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

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

  991.     }else if(!left){

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

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

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

  995.     }

  996.     return itype;

  997. }

  998. 

  999. static inline void rv34_process_block(RV34DecContext *r,

  1000.                                       uint8_t *pdst, int stride,

  1001.                                       int fc, int sc, int q_dc, int q_ac)

  1002. {

  1003.     MpegEncContext *s = &r->s;

  1004.     int16_t *ptr = s->block[0];

  1005.     int has_ac = rv34_decode_block(ptr, &s->gb, r->cur_vlcs,

  1006.                                    fc, sc, q_dc, q_ac, q_ac);

  1007.     if(has_ac){

  1008.         r->rdsp.rv34_idct_add(pdst, stride, ptr);

  1009.     }else{

  1010.         r->rdsp.rv34_idct_dc_add(pdst, stride, ptr[0]);

  1011.         ptr[0] = 0;

  1012.     }

  1013. }

  1014. 

  1015. static void rv34_output_i16x16(RV34DecContext *r, int8_t *intra_types, int cbp)

  1016. {

  1017.     LOCAL_ALIGNED_16(int16_t, block16, [16]);

  1018.     MpegEncContext *s    = &r->s;

  1019.     GetBitContext  *gb   = &s->gb;

  1020.     int             q_dc = rv34_qscale_tab[ r->luma_dc_quant_i[s->qscale] ],

  1021.                     q_ac = rv34_qscale_tab[s->qscale];

  1022.     uint8_t        *dst  = s->dest[0];

  1023.     int16_t        *ptr  = s->block[0];

  1024.     int i, j, itype, has_ac;

  1025. 

  1026.     memset(block16, 0, 16 * sizeof(*block16));

  1027. 

  1028.     has_ac = rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0, q_dc, q_dc, q_ac);

  1029.     if(has_ac)

  1030.         r->rdsp.rv34_inv_transform(block16);

  1031.     else

  1032.         r->rdsp.rv34_inv_transform_dc(block16);

  1033. 

  1034.     itype = ittrans16[intra_types[0]];

  1035.     itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);

  1036.     r->h.pred16x16[itype](dst, s->linesize);

  1037. 

  1038.     for(j = 0; j < 4; j++){

  1039.         for(i = 0; i < 4; i++, cbp >>= 1){

  1040.             int dc = block16[i + j*4];

  1041. 

  1042.             if(cbp & 1){

  1043.                 has_ac = rv34_decode_block(ptr, gb, r->cur_vlcs, r->luma_vlc, 0, q_ac, q_ac, q_ac);

  1044.             }else

  1045.                 has_ac = 0;

  1046. 

  1047.             if(has_ac){

  1048.                 ptr[0] = dc;

  1049.                 r->rdsp.rv34_idct_add(dst+4*i, s->linesize, ptr);

  1050.             }else

  1051.                 r->rdsp.rv34_idct_dc_add(dst+4*i, s->linesize, dc);

  1052.         }

  1053. 

  1054.         dst += 4*s->linesize;

  1055.     }

  1056. 

  1057.     itype = ittrans16[intra_types[0]];

  1058.     if(itype == PLANE_PRED8x8) itype = DC_PRED8x8;

  1059.     itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);

  1060. 

  1061.     q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];

  1062.     q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];

  1063. 

  1064.     for(j = 1; j < 3; j++){

  1065.         dst = s->dest[j];

  1066.         r->h.pred8x8[itype](dst, s->uvlinesize);

  1067.         for(i = 0; i < 4; i++, cbp >>= 1){

  1068.             uint8_t *pdst;

  1069.             if(!(cbp & 1)) continue;

  1070.             pdst   = dst + (i&1)*4 + (i&2)*2*s->uvlinesize;

  1071. 

  1072.             rv34_process_block(r, pdst, s->uvlinesize,

  1073.                                r->chroma_vlc, 1, q_dc, q_ac);

  1074.         }

  1075.     }

  1076. }

  1077. 

  1078. static void rv34_output_intra(RV34DecContext *r, int8_t *intra_types, int cbp)

  1079. {

  1080.     MpegEncContext *s   = &r->s;

  1081.     uint8_t        *dst = s->dest[0];

  1082.     int      avail[6*8] = {0};

  1083.     int i, j, k;

  1084.     int idx, q_ac, q_dc;

  1085. 

  1086.     // Set neighbour information.

  1087.     if(r->avail_cache[1])

  1088.         avail[0] = 1;

  1089.     if(r->avail_cache[2])

  1090.         avail[1] = avail[2] = 1;

  1091.     if(r->avail_cache[3])

  1092.         avail[3] = avail[4] = 1;

  1093.     if(r->avail_cache[4])

  1094.         avail[5] = 1;

  1095.     if(r->avail_cache[5])

  1096.         avail[8] = avail[16] = 1;

  1097.     if(r->avail_cache[9])

  1098.         avail[24] = avail[32] = 1;

  1099. 

  1100.     q_ac = rv34_qscale_tab[s->qscale];

  1101.     for(j = 0; j < 4; j++){

  1102.         idx = 9 + j*8;

  1103.         for(i = 0; i < 4; i++, cbp >>= 1, dst += 4, idx++){

  1104.             rv34_pred_4x4_block(r, dst, s->linesize, ittrans[intra_types[i]], avail[idx-8], avail[idx-1], avail[idx+7], avail[idx-7]);

  1105.             avail[idx] = 1;

  1106.             if(!(cbp & 1)) continue;

  1107. 

  1108.             rv34_process_block(r, dst, s->linesize,

  1109.                                r->luma_vlc, 0, q_ac, q_ac);

  1110.         }

  1111.         dst += s->linesize * 4 - 4*4;

  1112.         intra_types += r->intra_types_stride;

  1113.     }

  1114. 

  1115.     intra_types -= r->intra_types_stride * 4;

  1116. 

  1117.     q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];

  1118.     q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];

  1119. 

  1120.     for(k = 0; k < 2; k++){

  1121.         dst = s->dest[1+k];

  1122.         fill_rectangle(r->avail_cache + 6, 2, 2, 4, 0, 4);

  1123. 

  1124.         for(j = 0; j < 2; j++){

  1125.             int* acache = r->avail_cache + 6 + j*4;

  1126.             for(i = 0; i < 2; i++, cbp >>= 1, acache++){

  1127.                 int itype = ittrans[intra_types[i*2+j*2*r->intra_types_stride]];

  1128.                 rv34_pred_4x4_block(r, dst+4*i, s->uvlinesize, itype, acache[-4], acache[-1], !i && !j, acache[-3]);

  1129.                 acache[0] = 1;

  1130. 

  1131.                 if(!(cbp&1)) continue;

  1132. 

  1133.                 rv34_process_block(r, dst + 4*i, s->uvlinesize,

  1134.                                    r->chroma_vlc, 1, q_dc, q_ac);

  1135.             }

  1136. 

  1137.             dst += 4*s->uvlinesize;

  1138.         }

  1139.     }

  1140. }

  1141. 

  1142. static int is_mv_diff_gt_3(int16_t (*motion_val)[2], int step)

  1143. {

  1144.     int d;

  1145.     d = motion_val[0][0] - motion_val[-step][0];

  1146.     if(d < -3 || d > 3)

  1147.         return 1;

  1148.     d = motion_val[0][1] - motion_val[-step][1];

  1149.     if(d < -3 || d > 3)

  1150.         return 1;

  1151.     return 0;

  1152. }

  1153. 

  1154. static int rv34_set_deblock_coef(RV34DecContext *r)

  1155. {

  1156.     MpegEncContext *s = &r->s;

  1157.     int hmvmask = 0, vmvmask = 0, i, j;

  1158.     int midx = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;

  1159.     int16_t (*motion_val)[2] = &s->current_picture_ptr->motion_val[0][midx];

  1160.     for(j = 0; j < 16; j += 8){

  1161.         for(i = 0; i < 2; i++){

  1162.             if(is_mv_diff_gt_3(motion_val + i, 1))

  1163.                 vmvmask |= 0x11 << (j + i*2);

  1164.             if((j || s->mb_y) && is_mv_diff_gt_3(motion_val + i, s->b8_stride))

  1165.                 hmvmask |= 0x03 << (j + i*2);

  1166.         }

  1167.         motion_val += s->b8_stride;

  1168.     }

  1169.     if(s->first_slice_line)

  1170.         hmvmask &= ~0x000F;

  1171.     if(!s->mb_x)

  1172.         vmvmask &= ~0x1111;

  1173.     if(r->rv30){ //RV30 marks both subblocks on the edge for filtering

  1174.         vmvmask |= (vmvmask & 0x4444) >> 1;

  1175.         hmvmask |= (hmvmask & 0x0F00) >> 4;

  1176.         if(s->mb_x)

  1177.             r->deblock_coefs[s->mb_x - 1 + s->mb_y*s->mb_stride] |= (vmvmask & 0x1111) << 3;

  1178.         if(!s->first_slice_line)

  1179.             r->deblock_coefs[s->mb_x + (s->mb_y - 1)*s->mb_stride] |= (hmvmask & 0xF) << 12;

  1180.     }

  1181.     return hmvmask | vmvmask;

  1182. }

  1183. 

  1184. static int rv34_decode_inter_macroblock(RV34DecContext *r, int8_t *intra_types)

  1185. {

  1186.     MpegEncContext *s   = &r->s;

  1187.     GetBitContext  *gb  = &s->gb;

  1188.     uint8_t        *dst = s->dest[0];

  1189.     int16_t        *ptr = s->block[0];

  1190.     int          mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1191.     int cbp, cbp2;

  1192.     int q_dc, q_ac, has_ac;

  1193.     int i, j;

  1194.     int dist;

  1195. 

  1196.     // Calculate which neighbours are available. Maybe it's worth optimizing too.

  1197.     memset(r->avail_cache, 0, sizeof(r->avail_cache));

  1198.     fill_rectangle(r->avail_cache + 6, 2, 2, 4, 1, 4);

  1199.     dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;

  1200.     if(s->mb_x && dist)

  1201.         r->avail_cache[5] =

  1202.         r->avail_cache[9] = s->current_picture_ptr->mb_type[mb_pos - 1];

  1203.     if(dist >= s->mb_width)

  1204.         r->avail_cache[2] =

  1205.         r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];

  1206.     if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)

  1207.         r->avail_cache[4] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];

  1208.     if(s->mb_x && dist > s->mb_width)

  1209.         r->avail_cache[1] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];

  1210. 

  1211.     s->qscale = r->si.quant;

  1212.     cbp = cbp2 = rv34_decode_inter_mb_header(r, intra_types);

  1213.     r->cbp_luma  [mb_pos] = cbp;

  1214.     r->cbp_chroma[mb_pos] = cbp >> 16;

  1215.     r->deblock_coefs[mb_pos] = rv34_set_deblock_coef(r) | r->cbp_luma[mb_pos];

  1216.     s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;

  1217. 

  1218.     if(cbp == -1)

  1219.         return -1;

  1220. 

  1221.     if (IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){

  1222.         if(r->is16) rv34_output_i16x16(r, intra_types, cbp);

  1223.         else        rv34_output_intra(r, intra_types, cbp);

  1224.         return 0;

  1225.     }

  1226. 

  1227.     if(r->is16){

  1228.         // Only for RV34_MB_P_MIX16x16

  1229.         LOCAL_ALIGNED_16(int16_t, block16, [16]);

  1230.         memset(block16, 0, 16 * sizeof(*block16));

  1231.         q_dc = rv34_qscale_tab[ r->luma_dc_quant_p[s->qscale] ];

  1232.         q_ac = rv34_qscale_tab[s->qscale];

  1233.         if (rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0, q_dc, q_dc, q_ac))

  1234.             r->rdsp.rv34_inv_transform(block16);

  1235.         else

  1236.             r->rdsp.rv34_inv_transform_dc(block16);

  1237. 

  1238.         q_ac = rv34_qscale_tab[s->qscale];

  1239. 

  1240.         for(j = 0; j < 4; j++){

  1241.             for(i = 0; i < 4; i++, cbp >>= 1){

  1242.                 int      dc   = block16[i + j*4];

  1243. 

  1244.                 if(cbp & 1){

  1245.                     has_ac = rv34_decode_block(ptr, gb, r->cur_vlcs, r->luma_vlc, 0, q_ac, q_ac, q_ac);

  1246.                 }else

  1247.                     has_ac = 0;

  1248. 

  1249.                 if(has_ac){

  1250.                     ptr[0] = dc;

  1251.                     r->rdsp.rv34_idct_add(dst+4*i, s->linesize, ptr);

  1252.                 }else

  1253.                     r->rdsp.rv34_idct_dc_add(dst+4*i, s->linesize, dc);

  1254.             }

  1255. 

  1256.             dst += 4*s->linesize;

  1257.         }

  1258. 

  1259.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1260.     }else{

  1261.         q_ac = rv34_qscale_tab[s->qscale];

  1262. 

  1263.         for(j = 0; j < 4; j++){

  1264.             for(i = 0; i < 4; i++, cbp >>= 1){

  1265.                 if(!(cbp & 1)) continue;

  1266. 

  1267.                 rv34_process_block(r, dst + 4*i, s->linesize,

  1268.                                    r->luma_vlc, 0, q_ac, q_ac);

  1269.             }

  1270.             dst += 4*s->linesize;

  1271.         }

  1272.     }

  1273. 

  1274.     q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];

  1275.     q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];

  1276. 

  1277.     for(j = 1; j < 3; j++){

  1278.         dst = s->dest[j];

  1279.         for(i = 0; i < 4; i++, cbp >>= 1){

  1280.             uint8_t *pdst;

  1281.             if(!(cbp & 1)) continue;

  1282.             pdst = dst + (i&1)*4 + (i&2)*2*s->uvlinesize;

  1283. 

  1284.             rv34_process_block(r, pdst, s->uvlinesize,

  1285.                                r->chroma_vlc, 1, q_dc, q_ac);

  1286.         }

  1287.     }

  1288. 

  1289.     return 0;

  1290. }

  1291. 

  1292. static int rv34_decode_intra_macroblock(RV34DecContext *r, int8_t *intra_types)

  1293. {

  1294.     MpegEncContext *s = &r->s;

  1295.     int cbp, dist;

  1296.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1297. 

  1298.     // Calculate which neighbours are available. Maybe it's worth optimizing too.

  1299.     memset(r->avail_cache, 0, sizeof(r->avail_cache));

  1300.     fill_rectangle(r->avail_cache + 6, 2, 2, 4, 1, 4);

  1301.     dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;

  1302.     if(s->mb_x && dist)

  1303.         r->avail_cache[5] =

  1304.         r->avail_cache[9] = s->current_picture_ptr->mb_type[mb_pos - 1];

  1305.     if(dist >= s->mb_width)

  1306.         r->avail_cache[2] =

  1307.         r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];

  1308.     if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)

  1309.         r->avail_cache[4] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];

  1310.     if(s->mb_x && dist > s->mb_width)

  1311.         r->avail_cache[1] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];

  1312. 

  1313.     s->qscale = r->si.quant;

  1314.     cbp = rv34_decode_intra_mb_header(r, intra_types);

  1315.     r->cbp_luma  [mb_pos] = cbp;

  1316.     r->cbp_chroma[mb_pos] = cbp >> 16;

  1317.     r->deblock_coefs[mb_pos] = 0xFFFF;

  1318.     s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;

  1319. 

  1320.     if(cbp == -1)

  1321.         return -1;

  1322. 

  1323.     if(r->is16){

  1324.         rv34_output_i16x16(r, intra_types, cbp);

  1325.         return 0;

  1326.     }

  1327. 

  1328.     rv34_output_intra(r, intra_types, cbp);

  1329.     return 0;

  1330. }

  1331. 

  1332. static int check_slice_end(RV34DecContext *r, MpegEncContext *s)

  1333. {

  1334.     int bits;

  1335.     if(s->mb_y >= s->mb_height)

  1336.         return 1;

  1337.     if(!s->mb_num_left)

  1338.         return 1;

  1339.     if(r->s.mb_skip_run > 1)

  1340.         return 0;

  1341.     bits = get_bits_left(&s->gb);

  1342.     if(bits < 0 || (bits < 8 && !show_bits(&s->gb, bits)))

  1343.         return 1;

  1344.     return 0;

  1345. }

  1346. 

  1347. 

  1348. static void rv34_decoder_free(RV34DecContext *r)

  1349. {

  1350.     av_freep(&r->intra_types_hist);

  1351.     r->intra_types = NULL;

  1352.     av_freep(&r->tmp_b_block_base);

  1353.     av_freep(&r->mb_type);

  1354.     av_freep(&r->cbp_luma);

  1355.     av_freep(&r->cbp_chroma);

  1356.     av_freep(&r->deblock_coefs);

  1357. }

  1358. 

  1359. 

  1360. static int rv34_decoder_alloc(RV34DecContext *r)

  1361. {

  1362.     r->intra_types_stride = r->s.mb_width * 4 + 4;

  1363. 

  1364.     r->cbp_chroma       = av_malloc(r->s.mb_stride * r->s.mb_height *

  1365.                                     sizeof(*r->cbp_chroma));

  1366.     r->cbp_luma         = av_malloc(r->s.mb_stride * r->s.mb_height *

  1367.                                     sizeof(*r->cbp_luma));

  1368.     r->deblock_coefs    = av_malloc(r->s.mb_stride * r->s.mb_height *

  1369.                                     sizeof(*r->deblock_coefs));

  1370.     r->intra_types_hist = av_malloc(r->intra_types_stride * 4 * 2 *

  1371.                                     sizeof(*r->intra_types_hist));

  1372.     r->mb_type          = av_mallocz(r->s.mb_stride * r->s.mb_height *

  1373.                                      sizeof(*r->mb_type));

  1374. 

  1375.     if (!(r->cbp_chroma       && r->cbp_luma && r->deblock_coefs &&

  1376.           r->intra_types_hist && r->mb_type)) {

  1377.         rv34_decoder_free(r);

  1378.         return AVERROR(ENOMEM);

  1379.     }

  1380. 

  1381.     r->intra_types = r->intra_types_hist + r->intra_types_stride * 4;

  1382. 

  1383.     return 0;

  1384. }

  1385. 

  1386. 

  1387. static int rv34_decoder_realloc(RV34DecContext *r)

  1388. {

  1389.     rv34_decoder_free(r);

  1390.     return rv34_decoder_alloc(r);

  1391. }

  1392. 

  1393. 

  1394. static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int buf_size)

  1395. {

  1396.     MpegEncContext *s = &r->s;

  1397.     GetBitContext *gb = &s->gb;

  1398.     int mb_pos, slice_type;

  1399.     int res;

  1400. 

  1401.     init_get_bits(&r->s.gb, buf, buf_size*8);

  1402.     res = r->parse_slice_header(r, gb, &r->si);

  1403.     if(res < 0){

  1404.         av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");

  1405.         return -1;

  1406.     }

  1407. 

  1408.     slice_type = r->si.type ? r->si.type : AV_PICTURE_TYPE_I;

  1409.     if (slice_type != s->pict_type) {

  1410.         av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");

  1411.         return AVERROR_INVALIDDATA;

  1412.     }

  1413. 

  1414.     r->si.end = end;

  1415.     s->qscale = r->si.quant;

  1416.     s->mb_num_left = r->si.end - r->si.start;

  1417.     r->s.mb_skip_run = 0;

  1418. 

  1419.     mb_pos = s->mb_x + s->mb_y * s->mb_width;

  1420.     if(r->si.start != mb_pos){

  1421.         av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);

  1422.         s->mb_x = r->si.start % s->mb_width;

  1423.         s->mb_y = r->si.start / s->mb_width;

  1424.     }

  1425.     memset(r->intra_types_hist, -1, r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1426.     s->first_slice_line = 1;

  1427.     s->resync_mb_x = s->mb_x;

  1428.     s->resync_mb_y = s->mb_y;

  1429. 

  1430.     ff_init_block_index(s);

  1431.     while(!check_slice_end(r, s)) {

  1432.         ff_update_block_index(s);

  1433. 

  1434.         if(r->si.type)

  1435.             res = rv34_decode_inter_macroblock(r, r->intra_types + s->mb_x * 4 + 4);

  1436.         else

  1437.             res = rv34_decode_intra_macroblock(r, r->intra_types + s->mb_x * 4 + 4);

  1438.         if(res < 0){

  1439.             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_ERROR);

  1440.             return -1;

  1441.         }

  1442.         if (++s->mb_x == s->mb_width) {

  1443.             s->mb_x = 0;

  1444.             s->mb_y++;

  1445.             ff_init_block_index(s);

  1446. 

  1447.             memmove(r->intra_types_hist, r->intra_types, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));

  1448.             memset(r->intra_types, -1, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));

  1449. 

  1450.             if(r->loop_filter && s->mb_y >= 2)

  1451.                 r->loop_filter(r, s->mb_y - 2);

  1452. 

  1453.             if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))

  1454.                 ff_thread_report_progress(&s->current_picture_ptr->tf,

  1455.                                           s->mb_y - 2, 0);

  1456. 

  1457.         }

  1458.         if(s->mb_x == s->resync_mb_x)

  1459.             s->first_slice_line=0;

  1460.         s->mb_num_left--;

  1461.     }

  1462.     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);

  1463. 

  1464.     return s->mb_y == s->mb_height;

  1465. }

  1466. 

  1467. /** @} */ // reconstruction group end

  1468. 

  1469. /**

  1470.  * Initialize decoder.

  1471.  */

  1472. av_cold int ff_rv34_decode_init(AVCodecContext *avctx)

  1473. {

  1474.     RV34DecContext *r = avctx->priv_data;

  1475.     MpegEncContext *s = &r->s;

  1476.     int ret;

  1477. 

  1478.     ff_mpv_decode_defaults(s);

  1479.     s->avctx      = avctx;

  1480.     s->out_format = FMT_H263;

  1481.     s->codec_id   = avctx->codec_id;

  1482. 

  1483.     s->width  = avctx->width;

  1484.     s->height = avctx->height;

  1485. 

  1486.     r->s.avctx = avctx;

  1487.     avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  1488.     avctx->has_b_frames = 1;

  1489.     s->low_delay = 0;

  1490. 

  1491.     ff_mpv_idct_init(s);

  1492.     if ((ret = ff_mpv_common_init(s)) < 0)

  1493.         return ret;

  1494. 

  1495.     ff_h264_pred_init(&r->h, AV_CODEC_ID_RV40, 8, 1);

  1496. 

  1497. #if CONFIG_RV30_DECODER

  1498.     if (avctx->codec_id == AV_CODEC_ID_RV30)

  1499.         ff_rv30dsp_init(&r->rdsp);

  1500. #endif

  1501. #if CONFIG_RV40_DECODER

  1502.     if (avctx->codec_id == AV_CODEC_ID_RV40)

  1503.         ff_rv40dsp_init(&r->rdsp);

  1504. #endif

  1505. 

  1506.     if ((ret = rv34_decoder_alloc(r)) < 0) {

  1507.         ff_mpv_common_end(&r->s);

  1508.         return ret;

  1509.     }

  1510. 

  1511.     if(!intra_vlcs[0].cbppattern[0].bits)

  1512.         rv34_init_tables();

  1513. 

  1514.     avctx->internal->allocate_progress = 1;

  1515. 

  1516.     return 0;

  1517. }

  1518. 

  1519. int ff_rv34_decode_init_thread_copy(AVCodecContext *avctx)

  1520. {

  1521.     int err;

  1522.     RV34DecContext *r = avctx->priv_data;

  1523. 

  1524.     r->s.avctx = avctx;

  1525. 

  1526.     if (avctx->internal->is_copy) {

  1527.         r->tmp_b_block_base = NULL;

  1528.         ff_mpv_idct_init(&r->s);

  1529.         if ((err = ff_mpv_common_init(&r->s)) < 0)

  1530.             return err;

  1531.         if ((err = rv34_decoder_alloc(r)) < 0) {

  1532.             ff_mpv_common_end(&r->s);

  1533.             return err;

  1534.         }

  1535.     }

  1536. 

  1537.     return 0;

  1538. }

  1539. 

  1540. int ff_rv34_decode_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)

  1541. {

  1542.     RV34DecContext *r = dst->priv_data, *r1 = src->priv_data;

  1543.     MpegEncContext * const s = &r->s, * const s1 = &r1->s;

  1544.     int err;

  1545. 

  1546.     if (dst == src || !s1->context_initialized)

  1547.         return 0;

  1548. 

  1549.     if (s->height != s1->height || s->width != s1->width) {

  1550.         s->height = s1->height;

  1551.         s->width  = s1->width;

  1552.         if ((err = ff_mpv_common_frame_size_change(s)) < 0)

  1553.             return err;

  1554.         if ((err = rv34_decoder_realloc(r)) < 0)

  1555.             return err;

  1556.     }

  1557. 

  1558.     r->cur_pts  = r1->cur_pts;

  1559.     r->last_pts = r1->last_pts;

  1560.     r->next_pts = r1->next_pts;

  1561. 

  1562.     memset(&r->si, 0, sizeof(r->si));

  1563. 

  1564.     // Do no call ff_mpeg_update_thread_context on a partially initialized

  1565.     // decoder context.

  1566.     if (!s1->linesize)

  1567.         return 0;

  1568. 

  1569.     return ff_mpeg_update_thread_context(dst, src);

  1570. }

  1571. 

  1572. static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)

  1573. {

  1574.     if(avctx->slice_count) return avctx->slice_offset[n];

  1575.     else                   return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) :  AV_RB32(buf + n*8);

  1576. }

  1577. 

  1578. static int finish_frame(AVCodecContext *avctx, AVFrame *pict)

  1579. {

  1580.     RV34DecContext *r = avctx->priv_data;

  1581.     MpegEncContext *s = &r->s;

  1582.     int got_picture = 0, ret;

  1583. 

  1584.     ff_er_frame_end(&s->er);

  1585.     ff_mpv_frame_end(s);

  1586.     s->mb_num_left = 0;

  1587. 

  1588.     if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))

  1589.         ff_thread_report_progress(&s->current_picture_ptr->tf, INT_MAX, 0);

  1590. 

  1591.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  1592.         if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)

  1593.             return ret;

  1594.         ff_print_debug_info(s, s->current_picture_ptr);

  1595.         got_picture = 1;

  1596.     } else if (s->last_picture_ptr) {

  1597.         if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)

  1598.             return ret;

  1599.         ff_print_debug_info(s, s->last_picture_ptr);

  1600.         got_picture = 1;

  1601.     }

  1602. 

  1603.     return got_picture;

  1604. }

  1605. 

  1606. int ff_rv34_decode_frame(AVCodecContext *avctx,

  1607.                             void *data, int *got_picture_ptr,

  1608.                             AVPacket *avpkt)

  1609. {

  1610.     const uint8_t *buf = avpkt->data;

  1611.     int buf_size = avpkt->size;

  1612.     RV34DecContext *r = avctx->priv_data;

  1613.     MpegEncContext *s = &r->s;

  1614.     AVFrame *pict = data;

  1615.     SliceInfo si;

  1616.     int i, ret;

  1617.     int slice_count;

  1618.     const uint8_t *slices_hdr = NULL;

  1619.     int last = 0;

  1620. 

  1621.     /* no supplementary picture */

  1622.     if (buf_size == 0) {

  1623.         /* special case for last picture */

  1624.         if (s->low_delay==0 && s->next_picture_ptr) {

  1625.             if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)

  1626.                 return ret;

  1627.             s->next_picture_ptr = NULL;

  1628. 

  1629.             *got_picture_ptr = 1;

  1630.         }

  1631.         return 0;

  1632.     }

  1633. 

  1634.     if(!avctx->slice_count){

  1635.         slice_count = (*buf++) + 1;

  1636.         slices_hdr = buf + 4;

  1637.         buf += 8 * slice_count;

  1638.         buf_size -= 1 + 8 * slice_count;

  1639.     }else

  1640.         slice_count = avctx->slice_count;

  1641. 

  1642.     //parse first slice header to check whether this frame can be decoded

  1643.     if(get_slice_offset(avctx, slices_hdr, 0) < 0 ||

  1644.        get_slice_offset(avctx, slices_hdr, 0) > buf_size){

  1645.         av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");

  1646.         return AVERROR_INVALIDDATA;

  1647.     }

  1648.     init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), (buf_size-get_slice_offset(avctx, slices_hdr, 0))*8);

  1649.     if(r->parse_slice_header(r, &r->s.gb, &si) < 0 || si.start){

  1650.         av_log(avctx, AV_LOG_ERROR, "First slice header is incorrect\n");

  1651.         return AVERROR_INVALIDDATA;

  1652.     }

  1653.     if ((!s->last_picture_ptr || !s->last_picture_ptr->f->data[0]) &&

  1654.         si.type == AV_PICTURE_TYPE_B) {

  1655.         av_log(avctx, AV_LOG_ERROR, "Invalid decoder state: B-frame without "

  1656.                "reference data.\n");

  1657.         return AVERROR_INVALIDDATA;

  1658.     }

  1659.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && si.type==AV_PICTURE_TYPE_B)

  1660.        || (avctx->skip_frame >= AVDISCARD_NONKEY && si.type!=AV_PICTURE_TYPE_I)

  1661.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  1662.         return avpkt->size;

  1663. 

  1664.     /* first slice */

  1665.     if (si.start == 0) {

  1666.         if (s->mb_num_left > 0) {

  1667.             av_log(avctx, AV_LOG_ERROR, "New frame but still %d MB left.",

  1668.                    s->mb_num_left);

  1669.             ff_er_frame_end(&s->er);

  1670.             ff_mpv_frame_end(s);

  1671.         }

  1672. 

  1673.         if (s->width != si.width || s->height != si.height) {

  1674.             int err;

  1675. 

  1676.             av_log(s->avctx, AV_LOG_WARNING, "Changing dimensions to %dx%d\n",

  1677.                    si.width, si.height);

  1678. 

  1679.             s->width  = si.width;

  1680.             s->height = si.height;

  1681. 

  1682.             err = ff_set_dimensions(s->avctx, s->width, s->height);

  1683.             if (err < 0)

  1684.                 return err;

  1685. 

  1686.             if ((err = ff_mpv_common_frame_size_change(s)) < 0)

  1687.                 return err;

  1688.             if ((err = rv34_decoder_realloc(r)) < 0)

  1689.                 return err;

  1690.         }

  1691.         s->pict_type = si.type ? si.type : AV_PICTURE_TYPE_I;

  1692.         if (ff_mpv_frame_start(s, s->avctx) < 0)

  1693.             return -1;

  1694.         ff_mpeg_er_frame_start(s);

  1695.         if (!r->tmp_b_block_base) {

  1696.             int i;

  1697. 

  1698.             r->tmp_b_block_base = av_malloc(s->linesize * 48);

  1699.             for (i = 0; i < 2; i++)

  1700.                 r->tmp_b_block_y[i] = r->tmp_b_block_base

  1701.                                       + i * 16 * s->linesize;

  1702.             for (i = 0; i < 4; i++)

  1703.                 r->tmp_b_block_uv[i] = r->tmp_b_block_base + 32 * s->linesize

  1704.                                        + (i >> 1) * 8 * s->uvlinesize

  1705.                                        + (i &  1) * 16;

  1706.         }

  1707.         r->cur_pts = si.pts;

  1708.         if (s->pict_type != AV_PICTURE_TYPE_B) {

  1709.             r->last_pts = r->next_pts;

  1710.             r->next_pts = r->cur_pts;

  1711.         } else {

  1712.             int refdist = GET_PTS_DIFF(r->next_pts, r->last_pts);

  1713.             int dist0   = GET_PTS_DIFF(r->cur_pts,  r->last_pts);

  1714.             int dist1   = GET_PTS_DIFF(r->next_pts, r->cur_pts);

  1715. 

  1716.             if(!refdist){

  1717.                 r->mv_weight1 = r->mv_weight2 = r->weight1 = r->weight2 = 8192;

  1718.                 r->scaled_weight = 0;

  1719.             }else{

  1720.                 r->mv_weight1 = (dist0 << 14) / refdist;

  1721.                 r->mv_weight2 = (dist1 << 14) / refdist;

  1722.                 if((r->mv_weight1|r->mv_weight2) & 511){

  1723.                     r->weight1 = r->mv_weight1;

  1724.                     r->weight2 = r->mv_weight2;

  1725.                     r->scaled_weight = 0;

  1726.                 }else{

  1727.                     r->weight1 = r->mv_weight1 >> 9;

  1728.                     r->weight2 = r->mv_weight2 >> 9;

  1729.                     r->scaled_weight = 1;

  1730.                 }

  1731.             }

  1732.         }

  1733.         s->mb_x = s->mb_y = 0;

  1734.         ff_thread_finish_setup(s->avctx);

  1735.     } else if (HAVE_THREADS &&

  1736.                (s->avctx->active_thread_type & FF_THREAD_FRAME)) {

  1737.         av_log(s->avctx, AV_LOG_ERROR, "Decoder needs full frames in frame "

  1738.                "multithreading mode (start MB is %d).\n", si.start);

  1739.         return AVERROR_INVALIDDATA;

  1740.     }

  1741. 

  1742.     for(i = 0; i < slice_count; i++){

  1743.         int offset = get_slice_offset(avctx, slices_hdr, i);

  1744.         int size;

  1745.         if(i+1 == slice_count)

  1746.             size = buf_size - offset;

  1747.         else

  1748.             size = get_slice_offset(avctx, slices_hdr, i+1) - offset;

  1749. 

  1750.         if(offset < 0 || offset > buf_size){

  1751.             av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");

  1752.             break;

  1753.         }

  1754. 

  1755.         r->si.end = s->mb_width * s->mb_height;

  1756.         s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;

  1757. 

  1758.         if(i+1 < slice_count){

  1759.             if (get_slice_offset(avctx, slices_hdr, i+1) < 0 ||

  1760.                 get_slice_offset(avctx, slices_hdr, i+1) > buf_size) {

  1761.                 av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");

  1762.                 break;

  1763.             }

  1764.             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);

  1765.             if(r->parse_slice_header(r, &r->s.gb, &si) < 0){

  1766.                 if(i+2 < slice_count)

  1767.                     size = get_slice_offset(avctx, slices_hdr, i+2) - offset;

  1768.                 else

  1769.                     size = buf_size - offset;

  1770.             }else

  1771.                 r->si.end = si.start;

  1772.         }

  1773.         if (size < 0 || size > buf_size - offset) {

  1774.             av_log(avctx, AV_LOG_ERROR, "Slice size is invalid\n");

  1775.             break;

  1776.         }

  1777.         last = rv34_decode_slice(r, r->si.end, buf + offset, size);

  1778.         if(last)

  1779.             break;

  1780.     }

  1781. 

  1782.     if (s->current_picture_ptr) {

  1783.         if (last) {

  1784.             if(r->loop_filter)

  1785.                 r->loop_filter(r, s->mb_height - 1);

  1786. 

  1787.             ret = finish_frame(avctx, pict);

  1788.             if (ret < 0)

  1789.                 return ret;

  1790.             *got_picture_ptr = ret;

  1791.         } else if (HAVE_THREADS &&

  1792.                    (s->avctx->active_thread_type & FF_THREAD_FRAME)) {

  1793.             av_log(avctx, AV_LOG_INFO, "marking unfished frame as finished\n");

  1794.             /* always mark the current frame as finished, frame-mt supports

  1795.              * only complete frames */

  1796.             ff_er_frame_end(&s->er);

  1797.             ff_mpv_frame_end(s);

  1798.             s->mb_num_left = 0;

  1799.             ff_thread_report_progress(&s->current_picture_ptr->tf, INT_MAX, 0);

  1800.             return AVERROR_INVALIDDATA;

  1801.         }

  1802.     }

  1803. 

  1804.     return avpkt->size;

  1805. }

  1806. 

  1807. av_cold int ff_rv34_decode_end(AVCodecContext *avctx)

  1808. {

  1809.     RV34DecContext *r = avctx->priv_data;

  1810. 

  1811.     ff_mpv_common_end(&r->s);

  1812.     rv34_decoder_free(r);

  1813. 

  1814.     return 0;

  1815. }