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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 "mpegutils.h"

  32. #include "mpegvideo.h"

  33. #include "golomb.h"

  34. #include "internal.h"

  35. #include "mathops.h"

  36. #include "qpeldsp.h"

  37. #include "rectangle.h"

  38. #include "thread.h"

  39. 

  40. #include "rv34vlc.h"

  41. #include "rv34data.h"

  42. #include "rv34.h"

  43. 

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

  45. {

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

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

  48. }

  49. 

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

  51. static const int rv34_mb_type_to_lavc[12] = {

  52.     MB_TYPE_INTRA,

  53.     MB_TYPE_INTRA16x16              | MB_TYPE_SEPARATE_DC,

  54.     MB_TYPE_16x16   | MB_TYPE_L0,

  55.     MB_TYPE_8x8     | MB_TYPE_L0,

  56.     MB_TYPE_16x16   | MB_TYPE_L0,

  57.     MB_TYPE_16x16   | MB_TYPE_L1,

  58.     MB_TYPE_SKIP,

  59.     MB_TYPE_DIRECT2 | MB_TYPE_16x16,

  60.     MB_TYPE_16x8    | MB_TYPE_L0,

  61.     MB_TYPE_8x16    | MB_TYPE_L0,

  62.     MB_TYPE_16x16   | MB_TYPE_L0L1,

  63.     MB_TYPE_16x16   | MB_TYPE_L0    | MB_TYPE_SEPARATE_DC

  64. };

  65. 

  66. 

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

  68. 

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

  70. 

  71. /**

  72.  * @name RV30/40 VLC generating functions

  73.  * @{

  74.  */

  75. 

  76. static const int table_offs[] = {

  77.       0,   1818,   3622,   4144,   4698,   5234,   5804,   5868,   5900,   5932,

  78.    5996,   6252,   6316,   6348,   6380,   7674,   8944,  10274,  11668,  12250,

  79.   14060,  15846,  16372,  16962,  17512,  18148,  18180,  18212,  18244,  18308,

  80.   18564,  18628,  18660,  18692,  20036,  21314,  22648,  23968,  24614,  26384,

  81.   28190,  28736,  29366,  29938,  30608,  30640,  30672,  30704,  30768,  31024,

  82.   31088,  31120,  31184,  32570,  33898,  35236,  36644,  37286,  39020,  40802,

  83.   41368,  42052,  42692,  43348,  43380,  43412,  43444,  43476,  43604,  43668,

  84.   43700,  43732,  45100,  46430,  47778,  49160,  49802,  51550,  53340,  53972,

  85.   54648,  55348,  55994,  56122,  56154,  56186,  56218,  56346,  56410,  56442,

  86.   56474,  57878,  59290,  60636,  62036,  62682,  64460,  64524,  64588,  64716,

  87.   64844,  66076,  67466,  67978,  68542,  69064,  69648,  70296,  72010,  72074,

  88.   72138,  72202,  72330,  73572,  74936,  75454,  76030,  76566,  77176,  77822,

  89.   79582,  79646,  79678,  79742,  79870,  81180,  82536,  83064,  83672,  84242,

  90.   84934,  85576,  87384,  87448,  87480,  87544,  87672,  88982,  90340,  90902,

  91.   91598,  92182,  92846,  93488,  95246,  95278,  95310,  95374,  95502,  96878,

  92.   98266,  98848,  99542, 100234, 100884, 101524, 103320, 103352, 103384, 103416,

  93.  103480, 104874, 106222, 106910, 107584, 108258, 108902, 109544, 111366, 111398,

  94.  111430, 111462, 111494, 112878, 114320, 114988, 115660, 116310, 116950, 117592

  95. };

  96. 

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

  98. 

  99. /**

  100.  * Generate VLC from codeword lengths.

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

  102.  * @param size   length of input data

  103.  * @param vlc    output VLC

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

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

  106.  */

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

  108.                          const int num)

  109. {

  110.     int i;

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

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

  113.     uint8_t bits2[MAX_VLC_SIZE];

  114.     int maxbits = 0, realsize = 0;

  115. 

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

  117.         if(bits[i]){

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

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

  120.             realsize++;

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

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

  123.         }

  124.     }

  125. 

  126.     codes[0] = 0;

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

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

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

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

  131. 

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

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

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

  135.                        bits2, 1, 1,

  136.                        cw,    2, 2,

  137.                        syms,  2, 2, INIT_VLC_USE_NEW_STATIC);

  138. }

  139. 

  140. /**

  141.  * Initialize all tables.

  142.  */

  143. static av_cold void rv34_init_tables(void)

  144. {

  145.     int i, j, k;

  146. 

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

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

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

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

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

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

  153.                 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);

  154.             }

  155.         }

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

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

  158.         }

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

  160.     }

  161. 

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

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

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

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

  166.         }

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

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

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

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

  171.         }

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

  173.     }

  174. }

  175. 

  176. /** @} */ // vlc group

  177. 

  178. /**

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

  180.  * @{

  181.  */

  182. 

  183. /**

  184.  * Decode coded block pattern.

  185.  */

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

  187. {

  188.     int pattern, code, cbp=0;

  189.     int ones;

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

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

  192.     const int *curshift = shifts;

  193.     int i, t, mask;

  194. 

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

  196.     pattern = code & 0xF;

  197.     code >>= 4;

  198. 

  199.     ones = rv34_count_ones[pattern];

  200. 

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

  202.         if(pattern & mask)

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

  204.     }

  205. 

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

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

  208.         if(t == 1)

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

  210.         if(t == 2)

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

  212.     }

  213.     return cbp;

  214. }

  215. 

  216. /**

  217.  * Get one coefficient value from the bistream and store it.

  218.  */

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

  220. {

  221.     if(coef){

  222.         if(coef == esc){

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

  224.             if(coef > 23){

  225.                 coef -= 23;

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

  227.             }

  228.             coef += esc;

  229.         }

  230.         if(get_bits1(gb))

  231.             coef = -coef;

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

  233.     }

  234. }

  235. 

  236. /**

  237.  * Decode 2x2 subblock of coefficients.

  238.  */

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

  240. {

  241.     int flags = modulo_three_table[code];

  242. 

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

  244.     if(is_block2){

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

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

  247.     }else{

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

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

  250.     }

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

  252. }

  253. 

  254. /**

  255.  * Decode a single coefficient.

  256.  */

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

  258. {

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

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

  261. }

  262. 

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

  264.                                     int q_dc, int q_ac1, int q_ac2)

  265. {

  266.     int flags = modulo_three_table[code];

  267. 

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

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

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

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

  272. }

  273. 

  274. /**

  275.  * Decode coefficients for 4x4 block.

  276.  *

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

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

  279.  *  o--o

  280.  *    /

  281.  *   /

  282.  *  o--o

  283.  */

  284. 

  285. 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)

  286. {

  287.     int code, pattern, has_ac = 1;

  288. 

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

  290. 

  291.     pattern = code & 0x7;

  292. 

  293.     code >>= 3;

  294. 

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

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

  297.     } else {

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

  299.         if (!pattern)

  300.             return 0;

  301.         has_ac = 0;

  302.     }

  303. 

  304.     if(pattern & 4){

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

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

  307.     }

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

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

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

  311.     }

  312.     if(pattern & 1){

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

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

  315.     }

  316.     return has_ac | pattern;

  317. }

  318. 

  319. /**

  320.  * @name RV30/40 bitstream parsing

  321.  * @{

  322.  */

  323. 

  324. /**

  325.  * Decode starting slice position.

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

  327.  */

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

  329. {

  330.     int i;

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

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

  333.             break;

  334.     return rv34_mb_bits_sizes[i];

  335. }

  336. 

  337. /**

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

  339.  */

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

  341. {

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

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

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

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

  346. }

  347. 

  348. /**

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

  350.  */

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

  352. {

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

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

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

  356.     int t;

  357. 

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

  359.     if(r->is16){

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

  361.         r->block_type = RV34_MB_TYPE_INTRA16x16;

  362.         t = get_bits(gb, 2);

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

  364.         r->luma_vlc   = 2;

  365.     }else{

  366.         if(!r->rv30){

  367.             if(!get_bits1(gb))

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

  369.         }

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

  371.         r->block_type = RV34_MB_TYPE_INTRA;

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

  373.             return -1;

  374.         r->luma_vlc   = 1;

  375.     }

  376. 

  377.     r->chroma_vlc = 0;

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

  379. 

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

  381. }

  382. 

  383. /**

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

  385.  */

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

  387. {

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

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

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

  391.     int i, t;

  392. 

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

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

  395.         return -1;

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

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

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

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

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

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

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

  403.     }

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

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

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

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

  408.         return 0;

  409.     }

  410.     r->chroma_vlc = 1;

  411.     r->luma_vlc   = 0;

  412. 

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

  414.         if(r->is16){

  415.             t = get_bits(gb, 2);

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

  417.             r->luma_vlc   = 2;

  418.         }else{

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

  420.                 return -1;

  421.             r->luma_vlc   = 1;

  422.         }

  423.         r->chroma_vlc = 0;

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

  425.     }else{

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

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

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

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

  430.             r->is16 = 1;

  431.             r->chroma_vlc = 1;

  432.             r->luma_vlc   = 2;

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

  434.         }

  435.     }

  436. 

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

  438. }

  439. 

  440. /** @} */ //bitstream functions

  441. 

  442. /**

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

  444.  * @{

  445.  */

  446. 

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

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

  449. 

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

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

  452. 

  453. /** availability index for subblocks */

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

  455. 

  456. /**

  457.  * motion vector prediction

  458.  *

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

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

  461.  * some other vectors may be used instead.

  462.  */

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

  464. {

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

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

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

  468.     int i, j;

  469.     int mx, my;

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

  471.     int c_off = part_sizes_w[block_type];

  472. 

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

  474.     if(subblock_no == 3)

  475.         c_off = -1;

  476. 

  477.     if(avail[-1]){

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

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

  480.     }

  481.     if(avail[-4]){

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

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

  484.     }else{

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

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

  487.     }

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

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

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

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

  492.         }else{

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

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

  495.         }

  496.     }else{

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

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

  499.     }

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

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

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

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

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

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

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

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

  508.         }

  509.     }

  510. }

  511. 

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

  513. 

  514. /**

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

  516.  */

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

  518. {

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

  520. 

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

  522. }

  523. 

  524. /**

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

  526.  */

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

  528.                                       int A_avail, int B_avail, int C_avail,

  529.                                       int *mx, int *my)

  530. {

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

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

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

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

  535.             *mx /= 2;

  536.             *my /= 2;

  537.         }

  538.     }else{

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

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

  541.     }

  542. }

  543. 

  544. /**

  545.  * motion vector prediction for B-frames

  546.  */

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

  548. {

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

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

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

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

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

  554.     int mx, my;

  555.     int i, j;

  556.     Picture *cur_pic = s->current_picture_ptr;

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

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

  559. 

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

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

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

  563.         has_A = 1;

  564.     }

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

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

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

  568.         has_B = 1;

  569.     }

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

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

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

  573.         has_C = 1;

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

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

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

  577.         has_C = 1;

  578.     }

  579. 

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

  581. 

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

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

  584. 

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

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

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

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

  589.         }

  590.     }

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

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

  593.     }

  594. }

  595. 

  596. /**

  597.  * motion vector prediction - RV3 version

  598.  */

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

  600. {

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

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

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

  604.     int i, j, k;

  605.     int mx, my;

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

  607. 

  608.     if(avail[-1]){

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

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

  611.     }

  612.     if(avail[-4]){

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

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

  615.     }else{

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

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

  618.     }

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

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

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

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

  623.         }else{

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

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

  626.         }

  627.     }else{

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

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

  630.     }

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

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

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

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

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

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

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

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

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

  640.             }

  641.         }

  642.     }

  643. }

  644. 

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

  646. 

  647. /**

  648.  * generic motion compensation function

  649.  *

  650.  * @param r decoder context

  651.  * @param block_type type of the current block

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

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

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

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

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

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

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

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

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

  661.  */

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

  663.                           const int xoff, const int yoff, int mv_off,

  664.                           const int width, const int height, int dir,

  665.                           const int thirdpel, int weighted,

  666.                           qpel_mc_func (*qpel_mc)[16],

  667.                           h264_chroma_mc_func (*chroma_mc))

  668. {

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

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

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

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

  673.     int is16x16 = 1;

  674. 

  675.     if(thirdpel){

  676.         int chroma_mx, chroma_my;

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

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

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

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

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

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

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

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

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

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

  687.     }else{

  688.         int cx, cy;

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

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

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

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

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

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

  695.         umx = cx >> 2;

  696.         umy = cy >> 2;

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

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

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

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

  701.             uvmx = uvmy = 4;

  702.     }

  703. 

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

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

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

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

  708.         ff_thread_await_progress(f, mb_row, 0);

  709.     }

  710. 

  711.     dxy = ly*4 + lx;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  726. 

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

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

  729.                                  s->linesize, s->linesize,

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

  731.                             src_x - 2, src_y - 2, 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, s->h_edge_pos >> 1, s->v_edge_pos >> 1);

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

  738.                                  s->uvlinesize, s->uvlinesize,

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

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

  741.         srcU = uvbuf;

  742.         srcV = uvbuf + 16;

  743.     }

  744.     if(!weighted){

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

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

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

  748.     }else{

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

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

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

  752.     }

  753. 

  754.     if(block_type == RV34_MB_P_16x8){

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

  756.         Y    += 8;

  757.         srcY += 8;

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

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

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

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

  762.     }

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

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

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

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

  767. }

  768. 

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

  770.                         const int xoff, const int yoff, int mv_off,

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

  772. {

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

  774.             r->rdsp.put_pixels_tab,

  775.             r->rdsp.put_chroma_pixels_tab);

  776. }

  777. 

  778. static void rv4_weight(RV34DecContext *r)

  779. {

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

  781.                                                         r->tmp_b_block_y[0],

  782.                                                         r->tmp_b_block_y[1],

  783.                                                         r->weight1,

  784.                                                         r->weight2,

  785.                                                         r->s.linesize);

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

  787.                                                         r->tmp_b_block_uv[0],

  788.                                                         r->tmp_b_block_uv[2],

  789.                                                         r->weight1,

  790.                                                         r->weight2,

  791.                                                         r->s.uvlinesize);

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

  793.                                                         r->tmp_b_block_uv[1],

  794.                                                         r->tmp_b_block_uv[3],

  795.                                                         r->weight1,

  796.                                                         r->weight2,

  797.                                                         r->s.uvlinesize);

  798. }

  799. 

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

  801. {

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

  803. 

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

  805.             r->rdsp.put_pixels_tab,

  806.             r->rdsp.put_chroma_pixels_tab);

  807.     if(!weighted){

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

  809.                 r->rdsp.avg_pixels_tab,

  810.                 r->rdsp.avg_chroma_pixels_tab);

  811.     }else{

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

  813.                 r->rdsp.put_pixels_tab,

  814.                 r->rdsp.put_chroma_pixels_tab);

  815.         rv4_weight(r);

  816.     }

  817. }

  818. 

  819. static void rv34_mc_2mv_skip(RV34DecContext *r)

  820. {

  821.     int i, j;

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

  823. 

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

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

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

  827.                      weighted,

  828.                      r->rdsp.put_pixels_tab,

  829.                      r->rdsp.put_chroma_pixels_tab);

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

  831.                      weighted,

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

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

  834.         }

  835.     if(weighted)

  836.         rv4_weight(r);

  837. }

  838. 

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

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

  841. 

  842. /**

  843.  * Decode motion vector differences

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

  845.  */

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

  847. {

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

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

  850.     int i, j, k, l;

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

  852.     int next_bt;

  853. 

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

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

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

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

  858.     }

  859.     switch(block_type){

  860.     case RV34_MB_TYPE_INTRA:

  861.     case RV34_MB_TYPE_INTRA16x16:

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

  863.         return 0;

  864.     case RV34_MB_SKIP:

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

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

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

  868.             break;

  869.         }

  870.     case RV34_MB_B_DIRECT:

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

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

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

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

  875. 

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

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

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

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

  880.         }else

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

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

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

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

  885.                             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]);

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

  887.             rv34_mc_2mv(r, block_type);

  888.         else

  889.             rv34_mc_2mv_skip(r);

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

  891.         break;

  892.     case RV34_MB_P_16x16:

  893.     case RV34_MB_P_MIX16x16:

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

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

  896.         break;

  897.     case RV34_MB_B_FORWARD:

  898.     case RV34_MB_B_BACKWARD:

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

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

  901.         if(r->rv30)

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

  903.         else

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

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

  906.         break;

  907.     case RV34_MB_P_16x8:

  908.     case RV34_MB_P_8x16:

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

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

  911.         if(block_type == RV34_MB_P_16x8){

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

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

  914.         }

  915.         if(block_type == RV34_MB_P_8x16){

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

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

  918.         }

  919.         break;

  920.     case RV34_MB_B_BIDIR:

  921.         rv34_pred_mv_b  (r, block_type, 0);

  922.         rv34_pred_mv_b  (r, block_type, 1);

  923.         rv34_mc_2mv     (r, block_type);

  924.         break;

  925.     case RV34_MB_P_8x8:

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

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

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

  929.         }

  930.         break;

  931.     }

  932. 

  933.     return 0;

  934. }

  935. /** @} */ // mv group

  936. 

  937. /**

  938.  * @name Macroblock reconstruction functions

  939.  * @{

  940.  */

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

  942. static const int ittrans[9] = {

  943.  DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,

  944.  VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,

  945. };

  946. 

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

  948. static const int ittrans16[4] = {

  949.  DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,

  950. };

  951. 

  952. /**

  953.  * Perform 4x4 intra prediction.

  954.  */

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

  956. {

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

  958.     uint32_t topleft;

  959. 

  960.     if(!up && !left)

  961.         itype = DC_128_PRED;

  962.     else if(!up){

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

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

  965.     }else if(!left){

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

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

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

  969.     }

  970.     if(!down){

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

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

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

  974.     }

  975.     if(!right && up){

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

  977.         prev = (uint8_t*)&topleft;

  978.     }

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

  980. }

  981. 

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

  983. {

  984.     if(!up && !left)

  985.         itype = DC_128_PRED8x8;

  986.     else if(!up){

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

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

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

  990.     }else if(!left){

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

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

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

  994.     }

  995.     return itype;

  996. }

  997. 

  998. static inline void rv34_process_block(RV34DecContext *r,

  999.                                       uint8_t *pdst, int stride,

  1000.                                       int fc, int sc, int q_dc, int q_ac)

  1001. {

  1002.     MpegEncContext *s = &r->s;

  1003.     int16_t *ptr = s->block[0];

  1004.     int has_ac = rv34_decode_block(ptr, &s->gb, r->cur_vlcs,

  1005.                                    fc, sc, q_dc, q_ac, q_ac);

  1006.     if(has_ac){

  1007.         r->rdsp.rv34_idct_add(pdst, stride, ptr);

  1008.     }else{

  1009.         r->rdsp.rv34_idct_dc_add(pdst, stride, ptr[0]);

  1010.         ptr[0] = 0;

  1011.     }

  1012. }

  1013. 

  1014. static void rv34_output_i16x16(RV34DecContext *r, int8_t *intra_types, int cbp)

  1015. {

  1016.     LOCAL_ALIGNED_16(int16_t, block16, [16]);

  1017.     MpegEncContext *s    = &r->s;

  1018.     GetBitContext  *gb   = &s->gb;

  1019.     int             q_dc = rv34_qscale_tab[ r->luma_dc_quant_i[s->qscale] ],

  1020.                     q_ac = rv34_qscale_tab[s->qscale];

  1021.     uint8_t        *dst  = s->dest[0];

  1022.     int16_t        *ptr  = s->block[0];

  1023.     int i, j, itype, has_ac;

  1024. 

  1025.     memset(block16, 0, 16 * sizeof(*block16));

  1026. 

  1027.     has_ac = rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0, q_dc, q_dc, q_ac);

  1028.     if(has_ac)

  1029.         r->rdsp.rv34_inv_transform(block16);

  1030.     else

  1031.         r->rdsp.rv34_inv_transform_dc(block16);

  1032. 

  1033.     itype = ittrans16[intra_types[0]];

  1034.     itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);

  1035.     r->h.pred16x16[itype](dst, s->linesize);

  1036. 

  1037.     for(j = 0; j < 4; j++){

  1038.         for(i = 0; i < 4; i++, cbp >>= 1){

  1039.             int dc = block16[i + j*4];

  1040. 

  1041.             if(cbp & 1){

  1042.                 has_ac = rv34_decode_block(ptr, gb, r->cur_vlcs, r->luma_vlc, 0, q_ac, q_ac, q_ac);

  1043.             }else

  1044.                 has_ac = 0;

  1045. 

  1046.             if(has_ac){

  1047.                 ptr[0] = dc;

  1048.                 r->rdsp.rv34_idct_add(dst+4*i, s->linesize, ptr);

  1049.             }else

  1050.                 r->rdsp.rv34_idct_dc_add(dst+4*i, s->linesize, dc);

  1051.         }

  1052. 

  1053.         dst += 4*s->linesize;

  1054.     }

  1055. 

  1056.     itype = ittrans16[intra_types[0]];

  1057.     if(itype == PLANE_PRED8x8) itype = DC_PRED8x8;

  1058.     itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);

  1059. 

  1060.     q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];

  1061.     q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];

  1062. 

  1063.     for(j = 1; j < 3; j++){

  1064.         dst = s->dest[j];

  1065.         r->h.pred8x8[itype](dst, s->uvlinesize);

  1066.         for(i = 0; i < 4; i++, cbp >>= 1){

  1067.             uint8_t *pdst;

  1068.             if(!(cbp & 1)) continue;

  1069.             pdst   = dst + (i&1)*4 + (i&2)*2*s->uvlinesize;

  1070. 

  1071.             rv34_process_block(r, pdst, s->uvlinesize,

  1072.                                r->chroma_vlc, 1, q_dc, q_ac);

  1073.         }

  1074.     }

  1075. }

  1076. 

  1077. static void rv34_output_intra(RV34DecContext *r, int8_t *intra_types, int cbp)

  1078. {

  1079.     MpegEncContext *s   = &r->s;

  1080.     uint8_t        *dst = s->dest[0];

  1081.     int      avail[6*8] = {0};

  1082.     int i, j, k;

  1083.     int idx, q_ac, q_dc;

  1084. 

  1085.     // Set neighbour information.

  1086.     if(r->avail_cache[1])

  1087.         avail[0] = 1;

  1088.     if(r->avail_cache[2])

  1089.         avail[1] = avail[2] = 1;

  1090.     if(r->avail_cache[3])

  1091.         avail[3] = avail[4] = 1;

  1092.     if(r->avail_cache[4])

  1093.         avail[5] = 1;

  1094.     if(r->avail_cache[5])

  1095.         avail[8] = avail[16] = 1;

  1096.     if(r->avail_cache[9])

  1097.         avail[24] = avail[32] = 1;

  1098. 

  1099.     q_ac = rv34_qscale_tab[s->qscale];

  1100.     for(j = 0; j < 4; j++){

  1101.         idx = 9 + j*8;

  1102.         for(i = 0; i < 4; i++, cbp >>= 1, dst += 4, idx++){

  1103.             rv34_pred_4x4_block(r, dst, s->linesize, ittrans[intra_types[i]], avail[idx-8], avail[idx-1], avail[idx+7], avail[idx-7]);

  1104.             avail[idx] = 1;

  1105.             if(!(cbp & 1)) continue;

  1106. 

  1107.             rv34_process_block(r, dst, s->linesize,

  1108.                                r->luma_vlc, 0, q_ac, q_ac);

  1109.         }

  1110.         dst += s->linesize * 4 - 4*4;

  1111.         intra_types += r->intra_types_stride;

  1112.     }

  1113. 

  1114.     intra_types -= r->intra_types_stride * 4;

  1115. 

  1116.     q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];

  1117.     q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];

  1118. 

  1119.     for(k = 0; k < 2; k++){

  1120.         dst = s->dest[1+k];

  1121.         fill_rectangle(r->avail_cache + 6, 2, 2, 4, 0, 4);

  1122. 

  1123.         for(j = 0; j < 2; j++){

  1124.             int* acache = r->avail_cache + 6 + j*4;

  1125.             for(i = 0; i < 2; i++, cbp >>= 1, acache++){

  1126.                 int itype = ittrans[intra_types[i*2+j*2*r->intra_types_stride]];

  1127.                 rv34_pred_4x4_block(r, dst+4*i, s->uvlinesize, itype, acache[-4], acache[-1], !i && !j, acache[-3]);

  1128.                 acache[0] = 1;

  1129. 

  1130.                 if(!(cbp&1)) continue;

  1131. 

  1132.                 rv34_process_block(r, dst + 4*i, s->uvlinesize,

  1133.                                    r->chroma_vlc, 1, q_dc, q_ac);

  1134.             }

  1135. 

  1136.             dst += 4*s->uvlinesize;

  1137.         }

  1138.     }

  1139. }

  1140. 

  1141. static int is_mv_diff_gt_3(int16_t (*motion_val)[2], int step)

  1142. {

  1143.     int d;

  1144.     d = motion_val[0][0] - motion_val[-step][0];

  1145.     if(d < -3 || d > 3)

  1146.         return 1;

  1147.     d = motion_val[0][1] - motion_val[-step][1];

  1148.     if(d < -3 || d > 3)

  1149.         return 1;

  1150.     return 0;

  1151. }

  1152. 

  1153. static int rv34_set_deblock_coef(RV34DecContext *r)

  1154. {

  1155.     MpegEncContext *s = &r->s;

  1156.     int hmvmask = 0, vmvmask = 0, i, j;

  1157.     int midx = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;

  1158.     int16_t (*motion_val)[2] = &s->current_picture_ptr->motion_val[0][midx];

  1159.     for(j = 0; j < 16; j += 8){

  1160.         for(i = 0; i < 2; i++){

  1161.             if(is_mv_diff_gt_3(motion_val + i, 1))

  1162.                 vmvmask |= 0x11 << (j + i*2);

  1163.             if((j || s->mb_y) && is_mv_diff_gt_3(motion_val + i, s->b8_stride))

  1164.                 hmvmask |= 0x03 << (j + i*2);

  1165.         }

  1166.         motion_val += s->b8_stride;

  1167.     }

  1168.     if(s->first_slice_line)

  1169.         hmvmask &= ~0x000F;

  1170.     if(!s->mb_x)

  1171.         vmvmask &= ~0x1111;

  1172.     if(r->rv30){ //RV30 marks both subblocks on the edge for filtering

  1173.         vmvmask |= (vmvmask & 0x4444) >> 1;

  1174.         hmvmask |= (hmvmask & 0x0F00) >> 4;

  1175.         if(s->mb_x)

  1176.             r->deblock_coefs[s->mb_x - 1 + s->mb_y*s->mb_stride] |= (vmvmask & 0x1111) << 3;

  1177.         if(!s->first_slice_line)

  1178.             r->deblock_coefs[s->mb_x + (s->mb_y - 1)*s->mb_stride] |= (hmvmask & 0xF) << 12;

  1179.     }

  1180.     return hmvmask | vmvmask;

  1181. }

  1182. 

  1183. static int rv34_decode_inter_macroblock(RV34DecContext *r, int8_t *intra_types)

  1184. {

  1185.     MpegEncContext *s   = &r->s;

  1186.     GetBitContext  *gb  = &s->gb;

  1187.     uint8_t        *dst = s->dest[0];

  1188.     int16_t        *ptr = s->block[0];

  1189.     int          mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1190.     int cbp, cbp2;

  1191.     int q_dc, q_ac, has_ac;

  1192.     int i, j;

  1193.     int dist;

  1194. 

  1195.     // Calculate which neighbours are available. Maybe it's worth optimizing too.

  1196.     memset(r->avail_cache, 0, sizeof(r->avail_cache));

  1197.     fill_rectangle(r->avail_cache + 6, 2, 2, 4, 1, 4);

  1198.     dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;

  1199.     if(s->mb_x && dist)

  1200.         r->avail_cache[5] =

  1201.         r->avail_cache[9] = s->current_picture_ptr->mb_type[mb_pos - 1];

  1202.     if(dist >= s->mb_width)

  1203.         r->avail_cache[2] =

  1204.         r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];

  1205.     if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)

  1206.         r->avail_cache[4] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];

  1207.     if(s->mb_x && dist > s->mb_width)

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

  1209. 

  1210.     s->qscale = r->si.quant;

  1211.     cbp = cbp2 = rv34_decode_inter_mb_header(r, intra_types);

  1212.     r->cbp_luma  [mb_pos] = cbp;

  1213.     r->cbp_chroma[mb_pos] = cbp >> 16;

  1214.     r->deblock_coefs[mb_pos] = rv34_set_deblock_coef(r) | r->cbp_luma[mb_pos];

  1215.     s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;

  1216. 

  1217.     if(cbp == -1)

  1218.         return -1;

  1219. 

  1220.     if (IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){

  1221.         if(r->is16) rv34_output_i16x16(r, intra_types, cbp);

  1222.         else        rv34_output_intra(r, intra_types, cbp);

  1223.         return 0;

  1224.     }

  1225. 

  1226.     if(r->is16){

  1227.         // Only for RV34_MB_P_MIX16x16

  1228.         LOCAL_ALIGNED_16(int16_t, block16, [16]);

  1229.         memset(block16, 0, 16 * sizeof(*block16));

  1230.         q_dc = rv34_qscale_tab[ r->luma_dc_quant_p[s->qscale] ];

  1231.         q_ac = rv34_qscale_tab[s->qscale];

  1232.         if (rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0, q_dc, q_dc, q_ac))

  1233.             r->rdsp.rv34_inv_transform(block16);

  1234.         else

  1235.             r->rdsp.rv34_inv_transform_dc(block16);

  1236. 

  1237.         q_ac = rv34_qscale_tab[s->qscale];

  1238. 

  1239.         for(j = 0; j < 4; j++){

  1240.             for(i = 0; i < 4; i++, cbp >>= 1){

  1241.                 int      dc   = block16[i + j*4];

  1242. 

  1243.                 if(cbp & 1){

  1244.                     has_ac = rv34_decode_block(ptr, gb, r->cur_vlcs, r->luma_vlc, 0, q_ac, q_ac, q_ac);

  1245.                 }else

  1246.                     has_ac = 0;

  1247. 

  1248.                 if(has_ac){

  1249.                     ptr[0] = dc;

  1250.                     r->rdsp.rv34_idct_add(dst+4*i, s->linesize, ptr);

  1251.                 }else

  1252.                     r->rdsp.rv34_idct_dc_add(dst+4*i, s->linesize, dc);

  1253.             }

  1254. 

  1255.             dst += 4*s->linesize;

  1256.         }

  1257. 

  1258.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1259.     }else{

  1260.         q_ac = rv34_qscale_tab[s->qscale];

  1261. 

  1262.         for(j = 0; j < 4; j++){

  1263.             for(i = 0; i < 4; i++, cbp >>= 1){

  1264.                 if(!(cbp & 1)) continue;

  1265. 

  1266.                 rv34_process_block(r, dst + 4*i, s->linesize,

  1267.                                    r->luma_vlc, 0, q_ac, q_ac);

  1268.             }

  1269.             dst += 4*s->linesize;

  1270.         }

  1271.     }

  1272. 

  1273.     q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];

  1274.     q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];

  1275. 

  1276.     for(j = 1; j < 3; j++){

  1277.         dst = s->dest[j];

  1278.         for(i = 0; i < 4; i++, cbp >>= 1){

  1279.             uint8_t *pdst;

  1280.             if(!(cbp & 1)) continue;

  1281.             pdst = dst + (i&1)*4 + (i&2)*2*s->uvlinesize;

  1282. 

  1283.             rv34_process_block(r, pdst, s->uvlinesize,

  1284.                                r->chroma_vlc, 1, q_dc, q_ac);

  1285.         }

  1286.     }

  1287. 

  1288.     return 0;

  1289. }

  1290. 

  1291. static int rv34_decode_intra_macroblock(RV34DecContext *r, int8_t *intra_types)

  1292. {

  1293.     MpegEncContext *s = &r->s;

  1294.     int cbp, dist;

  1295.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1296. 

  1297.     // Calculate which neighbours are available. Maybe it's worth optimizing too.

  1298.     memset(r->avail_cache, 0, sizeof(r->avail_cache));

  1299.     fill_rectangle(r->avail_cache + 6, 2, 2, 4, 1, 4);

  1300.     dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;

  1301.     if(s->mb_x && dist)

  1302.         r->avail_cache[5] =

  1303.         r->avail_cache[9] = s->current_picture_ptr->mb_type[mb_pos - 1];

  1304.     if(dist >= s->mb_width)

  1305.         r->avail_cache[2] =

  1306.         r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];

  1307.     if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)

  1308.         r->avail_cache[4] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];

  1309.     if(s->mb_x && dist > s->mb_width)

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

  1311. 

  1312.     s->qscale = r->si.quant;

  1313.     cbp = rv34_decode_intra_mb_header(r, intra_types);

  1314.     r->cbp_luma  [mb_pos] = cbp;

  1315.     r->cbp_chroma[mb_pos] = cbp >> 16;

  1316.     r->deblock_coefs[mb_pos] = 0xFFFF;

  1317.     s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;

  1318. 

  1319.     if(cbp == -1)

  1320.         return -1;

  1321. 

  1322.     if(r->is16){

  1323.         rv34_output_i16x16(r, intra_types, cbp);

  1324.         return 0;

  1325.     }

  1326. 

  1327.     rv34_output_intra(r, intra_types, cbp);

  1328.     return 0;

  1329. }

  1330. 

  1331. static int check_slice_end(RV34DecContext *r, MpegEncContext *s)

  1332. {

  1333.     int bits;

  1334.     if(s->mb_y >= s->mb_height)

  1335.         return 1;

  1336.     if(!s->mb_num_left)

  1337.         return 1;

  1338.     if(r->s.mb_skip_run > 1)

  1339.         return 0;

  1340.     bits = get_bits_left(&s->gb);

  1341.     if(bits < 0 || (bits < 8 && !show_bits(&s->gb, bits)))

  1342.         return 1;

  1343.     return 0;

  1344. }

  1345. 

  1346. 

  1347. static void rv34_decoder_free(RV34DecContext *r)

  1348. {

  1349.     av_freep(&r->intra_types_hist);

  1350.     r->intra_types = NULL;

  1351.     av_freep(&r->tmp_b_block_base);

  1352.     av_freep(&r->mb_type);

  1353.     av_freep(&r->cbp_luma);

  1354.     av_freep(&r->cbp_chroma);

  1355.     av_freep(&r->deblock_coefs);

  1356. }

  1357. 

  1358. 

  1359. static int rv34_decoder_alloc(RV34DecContext *r)

  1360. {

  1361.     r->intra_types_stride = r->s.mb_width * 4 + 4;

  1362. 

  1363.     r->cbp_chroma       = av_malloc(r->s.mb_stride * r->s.mb_height *

  1364.                                     sizeof(*r->cbp_chroma));

  1365.     r->cbp_luma         = av_malloc(r->s.mb_stride * r->s.mb_height *

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

  1367.     r->deblock_coefs    = av_malloc(r->s.mb_stride * r->s.mb_height *

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

  1369.     r->intra_types_hist = av_malloc(r->intra_types_stride * 4 * 2 *

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

  1371.     r->mb_type          = av_mallocz(r->s.mb_stride * r->s.mb_height *

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

  1373. 

  1374.     if (!(r->cbp_chroma       && r->cbp_luma && r->deblock_coefs &&

  1375.           r->intra_types_hist && r->mb_type)) {

  1376.         rv34_decoder_free(r);

  1377.         return AVERROR(ENOMEM);

  1378.     }

  1379. 

  1380.     r->intra_types = r->intra_types_hist + r->intra_types_stride * 4;

  1381. 

  1382.     return 0;

  1383. }

  1384. 

  1385. 

  1386. static int rv34_decoder_realloc(RV34DecContext *r)

  1387. {

  1388.     rv34_decoder_free(r);

  1389.     return rv34_decoder_alloc(r);

  1390. }

  1391. 

  1392. 

  1393. static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int buf_size)

  1394. {

  1395.     MpegEncContext *s = &r->s;

  1396.     GetBitContext *gb = &s->gb;

  1397.     int mb_pos, slice_type;

  1398.     int res;

  1399. 

  1400.     init_get_bits(&r->s.gb, buf, buf_size*8);

  1401.     res = r->parse_slice_header(r, gb, &r->si);

  1402.     if(res < 0){

  1403.         av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");

  1404.         return -1;

  1405.     }

  1406. 

  1407.     slice_type = r->si.type ? r->si.type : AV_PICTURE_TYPE_I;

  1408.     if (slice_type != s->pict_type) {

  1409.         av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");

  1410.         return AVERROR_INVALIDDATA;

  1411.     }

  1412. 

  1413.     r->si.end = end;

  1414.     s->qscale = r->si.quant;

  1415.     s->mb_num_left = r->si.end - r->si.start;

  1416.     r->s.mb_skip_run = 0;

  1417. 

  1418.     mb_pos = s->mb_x + s->mb_y * s->mb_width;

  1419.     if(r->si.start != mb_pos){

  1420.         av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);

  1421.         s->mb_x = r->si.start % s->mb_width;

  1422.         s->mb_y = r->si.start / s->mb_width;

  1423.     }

  1424.     memset(r->intra_types_hist, -1, r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1425.     s->first_slice_line = 1;

  1426.     s->resync_mb_x = s->mb_x;

  1427.     s->resync_mb_y = s->mb_y;

  1428. 

  1429.     ff_init_block_index(s);

  1430.     while(!check_slice_end(r, s)) {

  1431.         ff_update_block_index(s);

  1432. 

  1433.         if(r->si.type)

  1434.             res = rv34_decode_inter_macroblock(r, r->intra_types + s->mb_x * 4 + 4);

  1435.         else

  1436.             res = rv34_decode_intra_macroblock(r, r->intra_types + s->mb_x * 4 + 4);

  1437.         if(res < 0){

  1438.             ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_ERROR);

  1439.             return -1;

  1440.         }

  1441.         if (++s->mb_x == s->mb_width) {

  1442.             s->mb_x = 0;

  1443.             s->mb_y++;

  1444.             ff_init_block_index(s);

  1445. 

  1446.             memmove(r->intra_types_hist, r->intra_types, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));

  1447.             memset(r->intra_types, -1, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));

  1448. 

  1449.             if(r->loop_filter && s->mb_y >= 2)

  1450.                 r->loop_filter(r, s->mb_y - 2);

  1451. 

  1452.             if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))

  1453.                 ff_thread_report_progress(&s->current_picture_ptr->tf,

  1454.                                           s->mb_y - 2, 0);

  1455. 

  1456.         }

  1457.         if(s->mb_x == s->resync_mb_x)

  1458.             s->first_slice_line=0;

  1459.         s->mb_num_left--;

  1460.     }

  1461.     ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);

  1462. 

  1463.     return s->mb_y == s->mb_height;

  1464. }

  1465. 

  1466. /** @} */ // recons group end

  1467. 

  1468. /**

  1469.  * Initialize decoder.

  1470.  */

  1471. av_cold int ff_rv34_decode_init(AVCodecContext *avctx)

  1472. {

  1473.     RV34DecContext *r = avctx->priv_data;

  1474.     MpegEncContext *s = &r->s;

  1475.     int ret;

  1476. 

  1477.     ff_MPV_decode_defaults(s);

  1478.     s->avctx      = avctx;

  1479.     s->out_format = FMT_H263;

  1480.     s->codec_id   = avctx->codec_id;

  1481. 

  1482.     s->width  = avctx->width;

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

  1484. 

  1485.     r->s.avctx = avctx;

  1486.     avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  1487.     avctx->has_b_frames = 1;

  1488.     s->low_delay = 0;

  1489. 

  1490.     if ((ret = ff_MPV_common_init(s)) < 0)

  1491.         return ret;

  1492. 

  1493.     ff_h264_pred_init(&r->h, AV_CODEC_ID_RV40, 8, 1);

  1494. 

  1495. #if CONFIG_RV30_DECODER

  1496.     if (avctx->codec_id == AV_CODEC_ID_RV30)

  1497.         ff_rv30dsp_init(&r->rdsp);

  1498. #endif

  1499. #if CONFIG_RV40_DECODER

  1500.     if (avctx->codec_id == AV_CODEC_ID_RV40)

  1501.         ff_rv40dsp_init(&r->rdsp);

  1502. #endif

  1503. 

  1504.     if ((ret = rv34_decoder_alloc(r)) < 0) {

  1505.         ff_MPV_common_end(&r->s);

  1506.         return ret;

  1507.     }

  1508. 

  1509.     if(!intra_vlcs[0].cbppattern[0].bits)

  1510.         rv34_init_tables();

  1511. 

  1512.     avctx->internal->allocate_progress = 1;

  1513. 

  1514.     return 0;

  1515. }

  1516. 

  1517. int ff_rv34_decode_init_thread_copy(AVCodecContext *avctx)

  1518. {

  1519.     int err;

  1520.     RV34DecContext *r = avctx->priv_data;

  1521. 

  1522.     r->s.avctx = avctx;

  1523. 

  1524.     if (avctx->internal->is_copy) {

  1525.         r->tmp_b_block_base = NULL;

  1526.         if ((err = ff_MPV_common_init(&r->s)) < 0)

  1527.             return err;

  1528.         if ((err = rv34_decoder_alloc(r)) < 0) {

  1529.             ff_MPV_common_end(&r->s);

  1530.             return err;

  1531.         }

  1532.     }

  1533. 

  1534.     return 0;

  1535. }

  1536. 

  1537. int ff_rv34_decode_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)

  1538. {

  1539.     RV34DecContext *r = dst->priv_data, *r1 = src->priv_data;

  1540.     MpegEncContext * const s = &r->s, * const s1 = &r1->s;

  1541.     int err;

  1542. 

  1543.     if (dst == src || !s1->context_initialized)

  1544.         return 0;

  1545. 

  1546.     if (s->height != s1->height || s->width != s1->width) {

  1547.         s->height = s1->height;

  1548.         s->width  = s1->width;

  1549.         if ((err = ff_MPV_common_frame_size_change(s)) < 0)

  1550.             return err;

  1551.         if ((err = rv34_decoder_realloc(r)) < 0)

  1552.             return err;

  1553.     }

  1554. 

  1555.     if ((err = ff_mpeg_update_thread_context(dst, src)))

  1556.         return err;

  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.     return 0;

  1565. }

  1566. 

  1567. static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)

  1568. {

  1569.     if(avctx->slice_count) return avctx->slice_offset[n];

  1570.     else                   return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) :  AV_RB32(buf + n*8);

  1571. }

  1572. 

  1573. static int finish_frame(AVCodecContext *avctx, AVFrame *pict)

  1574. {

  1575.     RV34DecContext *r = avctx->priv_data;

  1576.     MpegEncContext *s = &r->s;

  1577.     int got_picture = 0, ret;

  1578. 

  1579.     ff_er_frame_end(&s->er);

  1580.     ff_MPV_frame_end(s);

  1581.     s->mb_num_left = 0;

  1582. 

  1583.     if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))

  1584.         ff_thread_report_progress(&s->current_picture_ptr->tf, INT_MAX, 0);

  1585. 

  1586.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  1587.         if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)

  1588.             return ret;

  1589.         ff_print_debug_info(s, s->current_picture_ptr);

  1590.         got_picture = 1;

  1591.     } else if (s->last_picture_ptr != NULL) {

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

  1593.             return ret;

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

  1595.         got_picture = 1;

  1596.     }

  1597. 

  1598.     return got_picture;

  1599. }

  1600. 

  1601. int ff_rv34_decode_frame(AVCodecContext *avctx,

  1602.                             void *data, int *got_picture_ptr,

  1603.                             AVPacket *avpkt)

  1604. {

  1605.     const uint8_t *buf = avpkt->data;

  1606.     int buf_size = avpkt->size;

  1607.     RV34DecContext *r = avctx->priv_data;

  1608.     MpegEncContext *s = &r->s;

  1609.     AVFrame *pict = data;

  1610.     SliceInfo si;

  1611.     int i, ret;

  1612.     int slice_count;

  1613.     const uint8_t *slices_hdr = NULL;

  1614.     int last = 0;

  1615. 

  1616.     /* no supplementary picture */

  1617.     if (buf_size == 0) {

  1618.         /* special case for last picture */

  1619.         if (s->low_delay==0 && s->next_picture_ptr) {

  1620.             if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)

  1621.                 return ret;

  1622.             s->next_picture_ptr = NULL;

  1623. 

  1624.             *got_picture_ptr = 1;

  1625.         }

  1626.         return 0;

  1627.     }

  1628. 

  1629.     if(!avctx->slice_count){

  1630.         slice_count = (*buf++) + 1;

  1631.         slices_hdr = buf + 4;

  1632.         buf += 8 * slice_count;

  1633.         buf_size -= 1 + 8 * slice_count;

  1634.     }else

  1635.         slice_count = avctx->slice_count;

  1636. 

  1637.     //parse first slice header to check whether this frame can be decoded

  1638.     if(get_slice_offset(avctx, slices_hdr, 0) < 0 ||

  1639.        get_slice_offset(avctx, slices_hdr, 0) > buf_size){

  1640.         av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");

  1641.         return AVERROR_INVALIDDATA;

  1642.     }

  1643.     init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), (buf_size-get_slice_offset(avctx, slices_hdr, 0))*8);

  1644.     if(r->parse_slice_header(r, &r->s.gb, &si) < 0 || si.start){

  1645.         av_log(avctx, AV_LOG_ERROR, "First slice header is incorrect\n");

  1646.         return AVERROR_INVALIDDATA;

  1647.     }

  1648.     if ((!s->last_picture_ptr || !s->last_picture_ptr->f->data[0]) &&

  1649.         si.type == AV_PICTURE_TYPE_B) {

  1650.         av_log(avctx, AV_LOG_ERROR, "Invalid decoder state: B-frame without "

  1651.                "reference data.\n");

  1652.         return AVERROR_INVALIDDATA;

  1653.     }

  1654.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && si.type==AV_PICTURE_TYPE_B)

  1655.        || (avctx->skip_frame >= AVDISCARD_NONKEY && si.type!=AV_PICTURE_TYPE_I)

  1656.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  1657.         return avpkt->size;

  1658. 

  1659.     /* first slice */

  1660.     if (si.start == 0) {

  1661.         if (s->mb_num_left > 0) {

  1662.             av_log(avctx, AV_LOG_ERROR, "New frame but still %d MB left.",

  1663.                    s->mb_num_left);

  1664.             ff_er_frame_end(&s->er);

  1665.             ff_MPV_frame_end(s);

  1666.         }

  1667. 

  1668.         if (s->width != si.width || s->height != si.height) {

  1669.             int err;

  1670. 

  1671.             av_log(s->avctx, AV_LOG_WARNING, "Changing dimensions to %dx%d\n",

  1672.                    si.width, si.height);

  1673. 

  1674.             s->width  = si.width;

  1675.             s->height = si.height;

  1676. 

  1677.             err = ff_set_dimensions(s->avctx, s->width, s->height);

  1678.             if (err < 0)

  1679.                 return err;

  1680. 

  1681.             if ((err = ff_MPV_common_frame_size_change(s)) < 0)

  1682.                 return err;

  1683.             if ((err = rv34_decoder_realloc(r)) < 0)

  1684.                 return err;

  1685.         }

  1686.         s->pict_type = si.type ? si.type : AV_PICTURE_TYPE_I;

  1687.         if (ff_MPV_frame_start(s, s->avctx) < 0)

  1688.             return -1;

  1689.         ff_mpeg_er_frame_start(s);

  1690.         if (!r->tmp_b_block_base) {

  1691.             int i;

  1692. 

  1693.             r->tmp_b_block_base = av_malloc(s->linesize * 48);

  1694.             for (i = 0; i < 2; i++)

  1695.                 r->tmp_b_block_y[i] = r->tmp_b_block_base

  1696.                                       + i * 16 * s->linesize;

  1697.             for (i = 0; i < 4; i++)

  1698.                 r->tmp_b_block_uv[i] = r->tmp_b_block_base + 32 * s->linesize

  1699.                                        + (i >> 1) * 8 * s->uvlinesize

  1700.                                        + (i &  1) * 16;

  1701.         }

  1702.         r->cur_pts = si.pts;

  1703.         if (s->pict_type != AV_PICTURE_TYPE_B) {

  1704.             r->last_pts = r->next_pts;

  1705.             r->next_pts = r->cur_pts;

  1706.         } else {

  1707.             int refdist = GET_PTS_DIFF(r->next_pts, r->last_pts);

  1708.             int dist0   = GET_PTS_DIFF(r->cur_pts,  r->last_pts);

  1709.             int dist1   = GET_PTS_DIFF(r->next_pts, r->cur_pts);

  1710. 

  1711.             if(!refdist){

  1712.                 r->mv_weight1 = r->mv_weight2 = r->weight1 = r->weight2 = 8192;

  1713.                 r->scaled_weight = 0;

  1714.             }else{

  1715.                 r->mv_weight1 = (dist0 << 14) / refdist;

  1716.                 r->mv_weight2 = (dist1 << 14) / refdist;

  1717.                 if((r->mv_weight1|r->mv_weight2) & 511){

  1718.                     r->weight1 = r->mv_weight1;

  1719.                     r->weight2 = r->mv_weight2;

  1720.                     r->scaled_weight = 0;

  1721.                 }else{

  1722.                     r->weight1 = r->mv_weight1 >> 9;

  1723.                     r->weight2 = r->mv_weight2 >> 9;

  1724.                     r->scaled_weight = 1;

  1725.                 }

  1726.             }

  1727.         }

  1728.         s->mb_x = s->mb_y = 0;

  1729.         ff_thread_finish_setup(s->avctx);

  1730.     } else if (HAVE_THREADS &&

  1731.                (s->avctx->active_thread_type & FF_THREAD_FRAME)) {

  1732.         av_log(s->avctx, AV_LOG_ERROR, "Decoder needs full frames in frame "

  1733.                "multithreading mode (start MB is %d).\n", si.start);

  1734.         return AVERROR_INVALIDDATA;

  1735.     }

  1736. 

  1737.     for(i = 0; i < slice_count; i++){

  1738.         int offset = get_slice_offset(avctx, slices_hdr, i);

  1739.         int size;

  1740.         if(i+1 == slice_count)

  1741.             size = buf_size - offset;

  1742.         else

  1743.             size = get_slice_offset(avctx, slices_hdr, i+1) - offset;

  1744. 

  1745.         if(offset < 0 || offset > buf_size){

  1746.             av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");

  1747.             break;

  1748.         }

  1749. 

  1750.         r->si.end = s->mb_width * s->mb_height;

  1751.         s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;

  1752. 

  1753.         if(i+1 < slice_count){

  1754.             if (get_slice_offset(avctx, slices_hdr, i+1) < 0 ||

  1755.                 get_slice_offset(avctx, slices_hdr, i+1) > buf_size) {

  1756.                 av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");

  1757.                 break;

  1758.             }

  1759.             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);

  1760.             if(r->parse_slice_header(r, &r->s.gb, &si) < 0){

  1761.                 if(i+2 < slice_count)

  1762.                     size = get_slice_offset(avctx, slices_hdr, i+2) - offset;

  1763.                 else

  1764.                     size = buf_size - offset;

  1765.             }else

  1766.                 r->si.end = si.start;

  1767.         }

  1768.         if (size < 0 || size > buf_size - offset) {

  1769.             av_log(avctx, AV_LOG_ERROR, "Slice size is invalid\n");

  1770.             break;

  1771.         }

  1772.         last = rv34_decode_slice(r, r->si.end, buf + offset, size);

  1773.         if(last)

  1774.             break;

  1775.     }

  1776. 

  1777.     if (s->current_picture_ptr) {

  1778.         if (last) {

  1779.             if(r->loop_filter)

  1780.                 r->loop_filter(r, s->mb_height - 1);

  1781. 

  1782.             ret = finish_frame(avctx, pict);

  1783.             if (ret < 0)

  1784.                 return ret;

  1785.             *got_picture_ptr = ret;

  1786.         } else if (HAVE_THREADS &&

  1787.                    (s->avctx->active_thread_type & FF_THREAD_FRAME)) {

  1788.             av_log(avctx, AV_LOG_INFO, "marking unfished frame as finished\n");

  1789.             /* always mark the current frame as finished, frame-mt supports

  1790.              * only complete frames */

  1791.             ff_er_frame_end(&s->er);

  1792.             ff_MPV_frame_end(s);

  1793.             s->mb_num_left = 0;

  1794.             ff_thread_report_progress(&s->current_picture_ptr->tf, INT_MAX, 0);

  1795.             return AVERROR_INVALIDDATA;

  1796.         }

  1797.     }

  1798. 

  1799.     return avpkt->size;

  1800. }

  1801. 

  1802. av_cold int ff_rv34_decode_end(AVCodecContext *avctx)

  1803. {

  1804.     RV34DecContext *r = avctx->priv_data;

  1805. 

  1806.     ff_MPV_common_end(&r->s);

  1807.     rv34_decoder_free(r);

  1808. 

  1809.     return 0;

  1810. }