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FFmpeg/libavcodec/rv34.c

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  1. /*

  2.  * RV30/40 decoder common data

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file libavcodec/rv34.c

  24.  * RV30/40 decoder common data

  25.  */

  26. 

  27. #include "avcodec.h"

  28. #include "dsputil.h"

  29. #include "mpegvideo.h"

  30. #include "golomb.h"

  31. #include "mathops.h"

  32. #include "rectangle.h"

  33. 

  34. #include "rv34vlc.h"

  35. #include "rv34data.h"

  36. #include "rv34.h"

  37. 

  38. //#define DEBUG

  39. 

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

  41. {

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

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

  44. }

  45. 

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

  47. static const int rv34_mb_type_to_lavc[12] = {

  48.     MB_TYPE_INTRA,

  49.     MB_TYPE_INTRA16x16              | MB_TYPE_SEPARATE_DC,

  50.     MB_TYPE_16x16   | MB_TYPE_L0,

  51.     MB_TYPE_8x8     | MB_TYPE_L0,

  52.     MB_TYPE_16x16   | MB_TYPE_L0,

  53.     MB_TYPE_16x16   | MB_TYPE_L1,

  54.     MB_TYPE_SKIP,

  55.     MB_TYPE_DIRECT2 | MB_TYPE_16x16,

  56.     MB_TYPE_16x8    | MB_TYPE_L0,

  57.     MB_TYPE_8x16    | MB_TYPE_L0,

  58.     MB_TYPE_16x16   | MB_TYPE_L0L1,

  59.     MB_TYPE_16x16   | MB_TYPE_L0    | MB_TYPE_SEPARATE_DC

  60. };

  61. 

  62. 

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

  64. 

  65. /**

  66.  * @defgroup vlc RV30/40 VLC generating functions

  67.  * @{

  68.  */

  69. 

  70. static const int table_offs[] = {

  71.       0,   1818,   3622,   4144,   4698,   5234,   5804,   5868,   5900,   5932,

  72.    5996,   6252,   6316,   6348,   6380,   7674,   8944,  10274,  11668,  12250,

  73.   14060,  15846,  16372,  16962,  17512,  18148,  18180,  18212,  18244,  18308,

  74.   18564,  18628,  18660,  18692,  20036,  21314,  22648,  23968,  24614,  26384,

  75.   28190,  28736,  29366,  29938,  30608,  30640,  30672,  30704,  30768,  31024,

  76.   31088,  31120,  31184,  32570,  33898,  35236,  36644,  37286,  39020,  40802,

  77.   41368,  42052,  42692,  43348,  43380,  43412,  43444,  43476,  43604,  43668,

  78.   43700,  43732,  45100,  46430,  47778,  49160,  49802,  51550,  53340,  53972,

  79.   54648,  55348,  55994,  56122,  56154,  56186,  56218,  56346,  56410,  56442,

  80.   56474,  57878,  59290,  60636,  62036,  62682,  64460,  64524,  64588,  64716,

  81.   64844,  66076,  67466,  67978,  68542,  69064,  69648,  70296,  72010,  72074,

  82.   72138,  72202,  72330,  73572,  74936,  75454,  76030,  76566,  77176,  77822,

  83.   79582,  79646,  79678,  79742,  79870,  81180,  82536,  83064,  83672,  84242,

  84.   84934,  85576,  87384,  87448,  87480,  87544,  87672,  88982,  90340,  90902,

  85.   91598,  92182,  92846,  93488,  95246,  95278,  95310,  95374,  95502,  96878,

  86.   98266,  98848,  99542, 100234, 100884, 101524, 103320, 103352, 103384, 103416,

  87.  103480, 104874, 106222, 106910, 107584, 108258, 108902, 109544, 111366, 111398,

  88.  111430, 111462, 111494, 112878, 114320, 114988, 115660, 116310, 116950, 117592

  89. };

  90. 

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

  92. 

  93. /**

  94.  * Generate VLC from codeword lengths.

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

  96.  * @param size   length of input data

  97.  * @param vlc    output VLC

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

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

  100.  */

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

  102.                          const int num)

  103. {

  104.     int i;

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

  106.     uint16_t cw[size], syms[size];

  107.     uint8_t bits2[size];

  108.     int maxbits = 0, realsize = 0;

  109. 

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

  111.         if(bits[i]){

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

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

  114.             realsize++;

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

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

  117.         }

  118.     }

  119. 

  120.     codes[0] = 0;

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

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

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

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

  125. 

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

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

  128.     init_vlc_sparse(vlc, FFMIN(maxbits, 9), realsize,

  129.                     bits2, 1, 1,

  130.                     cw,    2, 2,

  131.                     syms,  2, 2, INIT_VLC_USE_NEW_STATIC);

  132. }

  133. 

  134. /**

  135.  * Initialize all tables.

  136.  */

  137. static av_cold void rv34_init_tables(void)

  138. {

  139.     int i, j, k;

  140. 

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

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

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

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

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

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

  147.                 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);

  148.             }

  149.         }

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

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

  152.         }

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

  154.     }

  155. 

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

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

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

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

  160.         }

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

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

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

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

  165.         }

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

  167.     }

  168. }

  169. 

  170. /** @} */ // vlc group

  171. 

  172. 

  173. /**

  174.  * @defgroup transform RV30/40 inverse transform functions

  175.  * @{

  176.  */

  177. 

  178. static av_always_inline void rv34_row_transform(int temp[16], DCTELEM *block)

  179. {

  180.     int i;

  181. 

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

  183.         const int z0= 13*(block[i+8*0] +    block[i+8*2]);

  184.         const int z1= 13*(block[i+8*0] -    block[i+8*2]);

  185.         const int z2=  7* block[i+8*1] - 17*block[i+8*3];

  186.         const int z3= 17* block[i+8*1] +  7*block[i+8*3];

  187. 

  188.         temp[4*i+0]= z0+z3;

  189.         temp[4*i+1]= z1+z2;

  190.         temp[4*i+2]= z1-z2;

  191.         temp[4*i+3]= z0-z3;

  192.     }

  193. }

  194. 

  195. /**

  196.  * Real Video 3.0/4.0 inverse transform

  197.  * Code is almost the same as in SVQ3, only scaling is different.

  198.  */

  199. static void rv34_inv_transform(DCTELEM *block){

  200.     int temp[16];

  201.     int i;

  202. 

  203.     rv34_row_transform(temp, block);

  204. 

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

  206.         const int z0= 13*(temp[4*0+i] +    temp[4*2+i]) + 0x200;

  207.         const int z1= 13*(temp[4*0+i] -    temp[4*2+i]) + 0x200;

  208.         const int z2=  7* temp[4*1+i] - 17*temp[4*3+i];

  209.         const int z3= 17* temp[4*1+i] +  7*temp[4*3+i];

  210. 

  211.         block[i*8+0]= (z0 + z3)>>10;

  212.         block[i*8+1]= (z1 + z2)>>10;

  213.         block[i*8+2]= (z1 - z2)>>10;

  214.         block[i*8+3]= (z0 - z3)>>10;

  215.     }

  216. 

  217. }

  218. 

  219. /**

  220.  * RealVideo 3.0/4.0 inverse transform for DC block

  221.  *

  222.  * Code is almost the same as rv34_inv_transform()

  223.  * but final coefficients are multiplied by 1.5 and have no rounding.

  224.  */

  225. static void rv34_inv_transform_noround(DCTELEM *block){

  226.     int temp[16];

  227.     int i;

  228. 

  229.     rv34_row_transform(temp, block);

  230. 

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

  232.         const int z0= 13*(temp[4*0+i] +    temp[4*2+i]);

  233.         const int z1= 13*(temp[4*0+i] -    temp[4*2+i]);

  234.         const int z2=  7* temp[4*1+i] - 17*temp[4*3+i];

  235.         const int z3= 17* temp[4*1+i] +  7*temp[4*3+i];

  236. 

  237.         block[i*8+0]= ((z0 + z3)*3)>>11;

  238.         block[i*8+1]= ((z1 + z2)*3)>>11;

  239.         block[i*8+2]= ((z1 - z2)*3)>>11;

  240.         block[i*8+3]= ((z0 - z3)*3)>>11;

  241.     }

  242. 

  243. }

  244. 

  245. /** @} */ // transform

  246. 

  247. 

  248. /**

  249.  * @defgroup block RV30/40 4x4 block decoding functions

  250.  * @{

  251.  */

  252. 

  253. /**

  254.  * Decode coded block pattern.

  255.  */

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

  257. {

  258.     int pattern, code, cbp=0;

  259.     int ones;

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

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

  262.     const int *curshift = shifts;

  263.     int i, t, mask;

  264. 

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

  266.     pattern = code & 0xF;

  267.     code >>= 4;

  268. 

  269.     ones = rv34_count_ones[pattern];

  270. 

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

  272.         if(pattern & mask)

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

  274.     }

  275. 

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

  277.         t = modulo_three_table[code][i];

  278.         if(t == 1)

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

  280.         if(t == 2)

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

  282.     }

  283.     return cbp;

  284. }

  285. 

  286. /**

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

  288.  */

  289. static inline void decode_coeff(DCTELEM *dst, int coef, int esc, GetBitContext *gb, VLC* vlc)

  290. {

  291.     if(coef){

  292.         if(coef == esc){

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

  294.             if(coef > 23){

  295.                 coef -= 23;

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

  297.             }

  298.             coef += esc;

  299.         }

  300.         if(get_bits1(gb))

  301.             coef = -coef;

  302.         *dst = coef;

  303.     }

  304. }

  305. 

  306. /**

  307.  * Decode 2x2 subblock of coefficients.

  308.  */

  309. static inline void decode_subblock(DCTELEM *dst, int code, const int is_block2, GetBitContext *gb, VLC *vlc)

  310. {

  311.     int coeffs[4];

  312. 

  313.     coeffs[0] = modulo_three_table[code][0];

  314.     coeffs[1] = modulo_three_table[code][1];

  315.     coeffs[2] = modulo_three_table[code][2];

  316.     coeffs[3] = modulo_three_table[code][3];

  317.     decode_coeff(dst  , coeffs[0], 3, gb, vlc);

  318.     if(is_block2){

  319.         decode_coeff(dst+8, coeffs[1], 2, gb, vlc);

  320.         decode_coeff(dst+1, coeffs[2], 2, gb, vlc);

  321.     }else{

  322.         decode_coeff(dst+1, coeffs[1], 2, gb, vlc);

  323.         decode_coeff(dst+8, coeffs[2], 2, gb, vlc);

  324.     }

  325.     decode_coeff(dst+9, coeffs[3], 2, gb, vlc);

  326. }

  327. 

  328. /**

  329.  * Decode coefficients for 4x4 block.

  330.  *

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

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

  333.  *  o--o

  334.  *    /

  335.  *   /

  336.  *  o--o

  337.  */

  338. 

  339. static inline void rv34_decode_block(DCTELEM *dst, GetBitContext *gb, RV34VLC *rvlc, int fc, int sc)

  340. {

  341.     int code, pattern;

  342. 

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

  344. 

  345.     pattern = code & 0x7;

  346. 

  347.     code >>= 3;

  348.     decode_subblock(dst, code, 0, gb, &rvlc->coefficient);

  349. 

  350.     if(pattern & 4){

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

  352.         decode_subblock(dst + 2, code, 0, gb, &rvlc->coefficient);

  353.     }

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

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

  356.         decode_subblock(dst + 8*2, code, 1, gb, &rvlc->coefficient);

  357.     }

  358.     if(pattern & 1){

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

  360.         decode_subblock(dst + 8*2+2, code, 0, gb, &rvlc->coefficient);

  361.     }

  362. 

  363. }

  364. 

  365. /**

  366.  * Dequantize ordinary 4x4 block.

  367.  * @todo optimize

  368.  */

  369. static inline void rv34_dequant4x4(DCTELEM *block, int Qdc, int Q)

  370. {

  371.     int i, j;

  372. 

  373.     block[0] = (block[0] * Qdc + 8) >> 4;

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

  375.         for(j = !i; j < 4; j++)

  376.             block[j + i*8] = (block[j + i*8] * Q + 8) >> 4;

  377. }

  378. 

  379. /**

  380.  * Dequantize 4x4 block of DC values for 16x16 macroblock.

  381.  * @todo optimize

  382.  */

  383. static inline void rv34_dequant4x4_16x16(DCTELEM *block, int Qdc, int Q)

  384. {

  385.     int i;

  386. 

  387.     for(i = 0; i < 3; i++)

  388.          block[rv34_dezigzag[i]] = (block[rv34_dezigzag[i]] * Qdc + 8) >> 4;

  389.     for(; i < 16; i++)

  390.          block[rv34_dezigzag[i]] = (block[rv34_dezigzag[i]] * Q + 8) >> 4;

  391. }

  392. /** @} */ //block functions

  393. 

  394. 

  395. /**

  396.  * @defgroup bitstream RV30/40 bitstream parsing

  397.  * @{

  398.  */

  399. 

  400. /**

  401.  * Decode starting slice position.

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

  403.  */

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

  405. {

  406.     int i;

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

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

  409.             break;

  410.     return rv34_mb_bits_sizes[i];

  411. }

  412. 

  413. /**

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

  415.  */

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

  417. {

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

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

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

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

  422. }

  423. 

  424. /**

  425.  * Decode quantizer difference and return modified quantizer.

  426.  */

  427. static inline int rv34_decode_dquant(GetBitContext *gb, int quant)

  428. {

  429.     if(get_bits1(gb))

  430.         return rv34_dquant_tab[get_bits1(gb)][quant];

  431.     else

  432.         return get_bits(gb, 5);

  433. }

  434. 

  435. /** @} */ //bitstream functions

  436. 

  437. /**

  438.  * @defgroup mv motion vector related code (prediction, reconstruction, motion compensation)

  439.  * @{

  440.  */

  441. 

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

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

  444. 

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

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

  447. 

  448. /** availability index for subblocks */

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

  450. 

  451. /**

  452.  * motion vector prediction

  453.  *

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

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

  456.  * some other vectors may be used instead.

  457.  */

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

  459. {

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

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

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

  463.     int i, j;

  464.     int mx, my;

  465.     int avail_index = avail_indexes[subblock_no];

  466.     int c_off = part_sizes_w[block_type];

  467. 

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

  469.     if(subblock_no == 3)

  470.         c_off = -1;

  471. 

  472.     if(r->avail_cache[avail_index - 1]){

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

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

  475.     }

  476.     if(r->avail_cache[avail_index - 4]){

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

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

  479.     }else{

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

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

  482.     }

  483.     if(!r->avail_cache[avail_index - 4 + c_off]){

  484.         if(r->avail_cache[avail_index - 4] && (r->avail_cache[avail_index - 1] || r->rv30)){

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

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

  487.         }else{

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

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

  490.         }

  491.     }else{

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

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

  494.     }

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

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

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

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

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

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

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

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

  503.         }

  504.     }

  505. }

  506. 

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

  508. 

  509. /**

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

  511.  */

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

  513. {

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

  515.     int dist = dir ? -GET_PTS_DIFF(r->next_pts, r->cur_pts) : GET_PTS_DIFF(r->cur_pts, r->last_pts);

  516.     int mul;

  517. 

  518.     if(!refdist) return 0;

  519.     mul = (dist << 14) / refdist;

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

  521. }

  522. 

  523. /**

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

  525.  */

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

  527.                                       int A_avail, int B_avail, int C_avail,

  528.                                       int *mx, int *my)

  529. {

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

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

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

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

  534.             *mx /= 2;

  535.             *my /= 2;

  536.         }

  537.     }else{

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

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

  540.     }

  541. }

  542. 

  543. /**

  544.  * motion vector prediction for B-frames

  545.  */

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

  547. {

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

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

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

  551.     int A[2], B[2], C[2];

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

  553.     int mx, my;

  554.     int i, j;

  555.     Picture *cur_pic = s->current_picture_ptr;

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

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

  558. 

  559.     memset(A, 0, sizeof(A));

  560.     memset(B, 0, sizeof(B));

  561.     memset(C, 0, sizeof(C));

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

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

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

  565.         has_A = 1;

  566.     }

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

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

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

  570.         has_B = 1;

  571.     }

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

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

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

  575.         has_C = 1;

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

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

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

  579.         has_C = 1;

  580.     }

  581. 

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

  583. 

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

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

  586. 

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

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

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

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

  591.         }

  592.     }

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

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

  595.     }

  596. }

  597. 

  598. /**

  599.  * motion vector prediction - RV3 version

  600.  */

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

  602. {

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

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

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

  606.     int i, j, k;

  607.     int mx, my;

  608.     int avail_index = avail_indexes[0];

  609. 

  610.     if(r->avail_cache[avail_index - 1]){

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

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

  613.     }

  614.     if(r->avail_cache[avail_index - 4]){

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

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

  617.     }else{

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

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

  620.     }

  621.     if(!r->avail_cache[avail_index - 4 + 2]){

  622.         if(r->avail_cache[avail_index - 4] && (r->avail_cache[avail_index - 1])){

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

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

  625.         }else{

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

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

  628.         }

  629.     }else{

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

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

  632.     }

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

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

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

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

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

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

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

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

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

  642.             }

  643.         }

  644.     }

  645. }

  646. 

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

  648. 

  649. /**

  650.  * generic motion compensation function

  651.  *

  652.  * @param r decoder context

  653.  * @param block_type type of the current block

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

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

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

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

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

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

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

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

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

  663.  */

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

  665.                           const int xoff, const int yoff, int mv_off,

  666.                           const int width, const int height, int dir,

  667.                           const int thirdpel,

  668.                           qpel_mc_func (*qpel_mc)[16],

  669.                           h264_chroma_mc_func (*chroma_mc))

  670. {

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

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

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

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

  675.     int is16x16 = 1;

  676. 

  677.     if(thirdpel){

  678.         int chroma_mx, chroma_my;

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

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

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

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

  683.         chroma_mx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + 1) >> 1;

  684.         chroma_my = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + 1) >> 1;

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

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

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

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

  689.     }else{

  690.         int cx, cy;

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

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

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

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

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

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

  697.         umx = cx >> 2;

  698.         umy = cy >> 2;

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

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

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

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

  703.             uvmx = uvmy = 4;

  704.     }

  705.     dxy = ly*4 + lx;

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

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

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

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

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

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

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

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

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

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

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

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

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

  719. 

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

  721.         ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, (width<<3)+6, (height<<3)+6,

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

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

  724.         ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, (width<<2)+1, (height<<2)+1,

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

  726.         ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, (width<<2)+1, (height<<2)+1,

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

  728.         srcU = uvbuf;

  729.         srcV = uvbuf + 16;

  730.     }

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

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

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

  734. 

  735.     if(block_type == RV34_MB_P_16x8){

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

  737.         Y    += 8;

  738.         srcY += 8;

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

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

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

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

  743.     }

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

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

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

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

  748. }

  749. 

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

  751.                         const int xoff, const int yoff, int mv_off,

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

  753. {

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

  755.             r->rv30 ? r->s.dsp.put_rv30_tpel_pixels_tab

  756.                     : r->s.dsp.put_rv40_qpel_pixels_tab,

  757.             r->rv30 ? r->s.dsp.put_h264_chroma_pixels_tab

  758.                     : r->s.dsp.put_rv40_chroma_pixels_tab);

  759. }

  760. 

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

  762. {

  763.     rv34_mc(r, block_type, 0, 0, 0, 2, 2, 0, r->rv30,

  764.             r->rv30 ? r->s.dsp.put_rv30_tpel_pixels_tab

  765.                     : r->s.dsp.put_rv40_qpel_pixels_tab,

  766.             r->rv30 ? r->s.dsp.put_h264_chroma_pixels_tab

  767.                     : r->s.dsp.put_rv40_chroma_pixels_tab);

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

  769.             r->rv30 ? r->s.dsp.avg_rv30_tpel_pixels_tab

  770.                     : r->s.dsp.avg_rv40_qpel_pixels_tab,

  771.             r->rv30 ? r->s.dsp.avg_h264_chroma_pixels_tab

  772.                     : r->s.dsp.avg_rv40_chroma_pixels_tab);

  773. }

  774. 

  775. static void rv34_mc_2mv_skip(RV34DecContext *r)

  776. {

  777.     int i, j;

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

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

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

  781.                     r->rv30 ? r->s.dsp.put_rv30_tpel_pixels_tab

  782.                             : r->s.dsp.put_rv40_qpel_pixels_tab,

  783.                     r->rv30 ? r->s.dsp.put_h264_chroma_pixels_tab

  784.                             : r->s.dsp.put_rv40_chroma_pixels_tab);

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

  786.                     r->rv30 ? r->s.dsp.avg_rv30_tpel_pixels_tab

  787.                             : r->s.dsp.avg_rv40_qpel_pixels_tab,

  788.                     r->rv30 ? r->s.dsp.avg_h264_chroma_pixels_tab

  789.                             : r->s.dsp.avg_rv40_chroma_pixels_tab);

  790.         }

  791. }

  792. 

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

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

  795. 

  796. /**

  797.  * Decode motion vector differences

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

  799.  */

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

  801. {

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

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

  804.     int i, j, k, l;

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

  806.     int next_bt;

  807. 

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

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

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

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

  812.     }

  813.     switch(block_type){

  814.     case RV34_MB_TYPE_INTRA:

  815.     case RV34_MB_TYPE_INTRA16x16:

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

  817.         return 0;

  818.     case RV34_MB_SKIP:

  819.         if(s->pict_type == FF_P_TYPE){

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

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

  822.             break;

  823.         }

  824.     case RV34_MB_B_DIRECT:

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

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

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

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

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

  830.         }else

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

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

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

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

  835.                             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]);

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

  837.             rv34_mc_2mv(r, block_type);

  838.         else

  839.             rv34_mc_2mv_skip(r);

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

  841.         break;

  842.     case RV34_MB_P_16x16:

  843.     case RV34_MB_P_MIX16x16:

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

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

  846.         break;

  847.     case RV34_MB_B_FORWARD:

  848.     case RV34_MB_B_BACKWARD:

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

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

  851.         if(r->rv30)

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

  853.         else

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

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

  856.         break;

  857.     case RV34_MB_P_16x8:

  858.     case RV34_MB_P_8x16:

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

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

  861.         if(block_type == RV34_MB_P_16x8){

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

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

  864.         }

  865.         if(block_type == RV34_MB_P_8x16){

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

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

  868.         }

  869.         break;

  870.     case RV34_MB_B_BIDIR:

  871.         rv34_pred_mv_b  (r, block_type, 0);

  872.         rv34_pred_mv_b  (r, block_type, 1);

  873.         rv34_mc_2mv     (r, block_type);

  874.         break;

  875.     case RV34_MB_P_8x8:

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

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

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

  879.         }

  880.         break;

  881.     }

  882. 

  883.     return 0;

  884. }

  885. /** @} */ // mv group

  886. 

  887. /**

  888.  * @defgroup recons Macroblock reconstruction functions

  889.  * @{

  890.  */

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

  892. static const int ittrans[9] = {

  893.  DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,

  894.  VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,

  895. };

  896. 

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

  898. static const int ittrans16[4] = {

  899.  DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,

  900. };

  901. 

  902. /**

  903.  * Perform 4x4 intra prediction.

  904.  */

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

  906. {

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

  908.     uint32_t topleft;

  909. 

  910.     if(!up && !left)

  911.         itype = DC_128_PRED;

  912.     else if(!up){

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

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

  915.     }else if(!left){

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

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

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

  919.     }

  920.     if(!down){

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

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

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

  924.     }

  925.     if(!right && up){

  926.         topleft = dst[-stride + 3] * 0x01010101;

  927.         prev = (uint8_t*)&topleft;

  928.     }

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

  930. }

  931. 

  932. /** add_pixels_clamped for 4x4 block */

  933. static void rv34_add_4x4_block(uint8_t *dst, int stride, DCTELEM block[64], int off)

  934. {

  935.     int x, y;

  936.     for(y = 0; y < 4; y++)

  937.         for(x = 0; x < 4; x++)

  938.             dst[x + y*stride] = av_clip_uint8(dst[x + y*stride] + block[off + x+y*8]);

  939. }

  940. 

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

  942. {

  943.     if(!up && !left)

  944.         itype = DC_128_PRED8x8;

  945.     else if(!up){

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

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

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

  949.     }else if(!left){

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

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

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

  953.     }

  954.     return itype;

  955. }

  956. 

  957. static void rv34_output_macroblock(RV34DecContext *r, int8_t *intra_types, int cbp, int is16)

  958. {

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

  960.     DSPContext *dsp = &s->dsp;

  961.     int i, j;

  962.     uint8_t *Y, *U, *V;

  963.     int itype;

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

  965.     int idx;

  966. 

  967.     // Set neighbour information.

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

  969.         avail[0] = 1;

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

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

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

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

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

  975.         avail[5] = 1;

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

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

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

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

  980. 

  981.     Y = s->dest[0];

  982.     U = s->dest[1];

  983.     V = s->dest[2];

  984.     if(!is16){

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

  986.             idx = 9 + j*8;

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

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

  989.                 avail[idx] = 1;

  990.                 if(cbp & 1)

  991.                     rv34_add_4x4_block(Y, s->linesize, s->block[(i>>1)+(j&2)], (i&1)*4+(j&1)*32);

  992.             }

  993.             Y += s->linesize * 4 - 4*4;

  994.             intra_types += r->intra_types_stride;

  995.         }

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

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

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

  999.             idx = 6 + j*4;

  1000.             for(i = 0; i < 2; i++, cbp >>= 1, idx++){

  1001.                 rv34_pred_4x4_block(r, U + i*4 + j*4*s->uvlinesize, s->uvlinesize, ittrans[intra_types[i*2+j*2*r->intra_types_stride]], r->avail_cache[idx-4], r->avail_cache[idx-1], !i && !j, r->avail_cache[idx-3]);

  1002.                 rv34_pred_4x4_block(r, V + i*4 + j*4*s->uvlinesize, s->uvlinesize, ittrans[intra_types[i*2+j*2*r->intra_types_stride]], r->avail_cache[idx-4], r->avail_cache[idx-1], !i && !j, r->avail_cache[idx-3]);

  1003.                 r->avail_cache[idx] = 1;

  1004.                 if(cbp & 0x01)

  1005.                     rv34_add_4x4_block(U + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[4], i*4+j*32);

  1006.                 if(cbp & 0x10)

  1007.                     rv34_add_4x4_block(V + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[5], i*4+j*32);

  1008.             }

  1009.         }

  1010.     }else{

  1011.         itype = ittrans16[intra_types[0]];

  1012.         itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);

  1013.         r->h.pred16x16[itype](Y, s->linesize);

  1014.         dsp->add_pixels_clamped(s->block[0], Y,     s->linesize);

  1015.         dsp->add_pixels_clamped(s->block[1], Y + 8, s->linesize);

  1016.         Y += s->linesize * 8;

  1017.         dsp->add_pixels_clamped(s->block[2], Y,     s->linesize);

  1018.         dsp->add_pixels_clamped(s->block[3], Y + 8, s->linesize);

  1019. 

  1020.         itype = ittrans16[intra_types[0]];

  1021.         if(itype == PLANE_PRED8x8) itype = DC_PRED8x8;

  1022.         itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);

  1023.         r->h.pred8x8[itype](U, s->uvlinesize);

  1024.         dsp->add_pixels_clamped(s->block[4], U, s->uvlinesize);

  1025.         r->h.pred8x8[itype](V, s->uvlinesize);

  1026.         dsp->add_pixels_clamped(s->block[5], V, s->uvlinesize);

  1027.     }

  1028. }

  1029. 

  1030. /** @} */ // recons group

  1031. 

  1032. /**

  1033.  * @addtogroup bitstream

  1034.  * Decode macroblock header and return CBP in case of success, -1 otherwise.

  1035.  */

  1036. static int rv34_decode_mb_header(RV34DecContext *r, int8_t *intra_types)

  1037. {

  1038.     MpegEncContext *s = &r->s;

  1039.     GetBitContext *gb = &s->gb;

  1040.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1041.     int i, t;

  1042. 

  1043.     if(!r->si.type){

  1044.         r->is16 = get_bits1(gb);

  1045.         if(!r->is16 && !r->rv30){

  1046.             if(!get_bits1(gb))

  1047.                 av_log(s->avctx, AV_LOG_ERROR, "Need DQUANT\n");

  1048.         }

  1049.         s->current_picture_ptr->mb_type[mb_pos] = r->is16 ? MB_TYPE_INTRA16x16 : MB_TYPE_INTRA;

  1050.         r->block_type = r->is16 ? RV34_MB_TYPE_INTRA16x16 : RV34_MB_TYPE_INTRA;

  1051.     }else{

  1052.         r->block_type = r->decode_mb_info(r);

  1053.         if(r->block_type == -1)

  1054.             return -1;

  1055.         s->current_picture_ptr->mb_type[mb_pos] = rv34_mb_type_to_lavc[r->block_type];

  1056.         r->mb_type[mb_pos] = r->block_type;

  1057.         if(r->block_type == RV34_MB_SKIP){

  1058.             if(s->pict_type == FF_P_TYPE)

  1059.                 r->mb_type[mb_pos] = RV34_MB_P_16x16;

  1060.             if(s->pict_type == FF_B_TYPE)

  1061.                 r->mb_type[mb_pos] = RV34_MB_B_DIRECT;

  1062.         }

  1063.         r->is16 = !!IS_INTRA16x16(s->current_picture_ptr->mb_type[mb_pos]);

  1064.         rv34_decode_mv(r, r->block_type);

  1065.         if(r->block_type == RV34_MB_SKIP){

  1066.             fill_rectangle(intra_types, 4, 4, r->intra_types_stride, 0, sizeof(intra_types[0]));

  1067.             return 0;

  1068.         }

  1069.         r->chroma_vlc = 1;

  1070.         r->luma_vlc   = 0;

  1071.     }

  1072.     if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){

  1073.         if(r->is16){

  1074.             t = get_bits(gb, 2);

  1075.             fill_rectangle(intra_types, 4, 4, r->intra_types_stride, t, sizeof(intra_types[0]));

  1076.             r->luma_vlc   = 2;

  1077.         }else{

  1078.             if(r->decode_intra_types(r, gb, intra_types) < 0)

  1079.                 return -1;

  1080.             r->luma_vlc   = 1;

  1081.         }

  1082.         r->chroma_vlc = 0;

  1083.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);

  1084.     }else{

  1085.         for(i = 0; i < 16; i++)

  1086.             intra_types[(i & 3) + (i>>2) * r->intra_types_stride] = 0;

  1087.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1088.         if(r->mb_type[mb_pos] == RV34_MB_P_MIX16x16){

  1089.             r->is16 = 1;

  1090.             r->chroma_vlc = 1;

  1091.             r->luma_vlc   = 2;

  1092.             r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);

  1093.         }

  1094.     }

  1095. 

  1096.     return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);

  1097. }

  1098. 

  1099. /**

  1100.  * @addtogroup recons

  1101.  * @{

  1102.  */

  1103. /**

  1104.  * mask for retrieving all bits in coded block pattern

  1105.  * corresponding to one 8x8 block

  1106.  */

  1107. #define LUMA_CBP_BLOCK_MASK 0x33

  1108. 

  1109. #define U_CBP_MASK 0x0F0000

  1110. #define V_CBP_MASK 0xF00000

  1111. 

  1112. 

  1113. static void rv34_apply_differences(RV34DecContext *r, int cbp)

  1114. {

  1115.     static const int shifts[4] = { 0, 2, 8, 10 };

  1116.     MpegEncContext *s = &r->s;

  1117.     int i;

  1118. 

  1119.     for(i = 0; i < 4; i++)

  1120.         if((cbp & (LUMA_CBP_BLOCK_MASK << shifts[i])) || r->block_type == RV34_MB_P_MIX16x16)

  1121.             s->dsp.add_pixels_clamped(s->block[i], s->dest[0] + (i & 1)*8 + (i&2)*4*s->linesize, s->linesize);

  1122.     if(cbp & U_CBP_MASK)

  1123.         s->dsp.add_pixels_clamped(s->block[4], s->dest[1], s->uvlinesize);

  1124.     if(cbp & V_CBP_MASK)

  1125.         s->dsp.add_pixels_clamped(s->block[5], s->dest[2], s->uvlinesize);

  1126. }

  1127. 

  1128. static int is_mv_diff_gt_3(int16_t (*motion_val)[2], int step)

  1129. {

  1130.     int d;

  1131.     d = motion_val[0][0] - motion_val[-step][0];

  1132.     if(d < -3 || d > 3)

  1133.         return 1;

  1134.     d = motion_val[0][1] - motion_val[-step][1];

  1135.     if(d < -3 || d > 3)

  1136.         return 1;

  1137.     return 0;

  1138. }

  1139. 

  1140. static int rv34_set_deblock_coef(RV34DecContext *r)

  1141. {

  1142.     MpegEncContext *s = &r->s;

  1143.     int hmvmask = 0, vmvmask = 0, i, j;

  1144.     int midx = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;

  1145.     int16_t (*motion_val)[2] = s->current_picture_ptr->motion_val[0][midx];

  1146.     for(j = 0; j < 16; j += 8){

  1147.         for(i = 0; i < 2; i++){

  1148.             if(is_mv_diff_gt_3(motion_val + i, 1))

  1149.                 vmvmask |= 0x11 << (j + i*2);

  1150.             if((j || s->mb_y) && is_mv_diff_gt_3(motion_val + i, s->b8_stride))

  1151.                 hmvmask |= 0x03 << (j + i*2);

  1152.         }

  1153.         motion_val += s->b8_stride;

  1154.     }

  1155.     if(s->first_slice_line)

  1156.         hmvmask &= ~0x000F;

  1157.     if(!s->mb_x)

  1158.         vmvmask &= ~0x1111;

  1159.     if(r->rv30){ //RV30 marks both subblocks on the edge for filtering

  1160.         vmvmask |= (vmvmask & 0x4444) >> 1;

  1161.         hmvmask |= (hmvmask & 0x0F00) >> 4;

  1162.         if(s->mb_x)

  1163.             r->deblock_coefs[s->mb_x - 1 + s->mb_y*s->mb_stride] |= (vmvmask & 0x1111) << 3;

  1164.         if(!s->first_slice_line)

  1165.             r->deblock_coefs[s->mb_x + (s->mb_y - 1)*s->mb_stride] |= (hmvmask & 0xF) << 12;

  1166.     }

  1167.     return hmvmask | vmvmask;

  1168. }

  1169. 

  1170. static int rv34_decode_macroblock(RV34DecContext *r, int8_t *intra_types)

  1171. {

  1172.     MpegEncContext *s = &r->s;

  1173.     GetBitContext *gb = &s->gb;

  1174.     int cbp, cbp2;

  1175.     int i, blknum, blkoff;

  1176.     DCTELEM block16[64];

  1177.     int luma_dc_quant;

  1178.     int dist;

  1179.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1180. 

  1181.     // Calculate which neighbours are available. Maybe it's worth optimizing too.

  1182.     memset(r->avail_cache, 0, sizeof(r->avail_cache));

  1183.     fill_rectangle(r->avail_cache + 6, 2, 2, 4, 1, 4);

  1184.     dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;

  1185.     if(s->mb_x && dist)

  1186.         r->avail_cache[5] =

  1187.         r->avail_cache[9] = s->current_picture_ptr->mb_type[mb_pos - 1];

  1188.     if(dist >= s->mb_width)

  1189.         r->avail_cache[2] =

  1190.         r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];

  1191.     if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)

  1192.         r->avail_cache[4] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];

  1193.     if(s->mb_x && dist > s->mb_width)

  1194.         r->avail_cache[1] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];

  1195. 

  1196.     s->qscale = r->si.quant;

  1197.     cbp = cbp2 = rv34_decode_mb_header(r, intra_types);

  1198.     r->cbp_luma  [mb_pos] = cbp;

  1199.     r->cbp_chroma[mb_pos] = cbp >> 16;

  1200.     if(s->pict_type == FF_I_TYPE)

  1201.         r->deblock_coefs[mb_pos] = 0xFFFF;

  1202.     else

  1203.         r->deblock_coefs[mb_pos] = rv34_set_deblock_coef(r) | r->cbp_luma[mb_pos];

  1204.     s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;

  1205. 

  1206.     if(cbp == -1)

  1207.         return -1;

  1208. 

  1209.     luma_dc_quant = r->block_type == RV34_MB_P_MIX16x16 ? r->luma_dc_quant_p[s->qscale] : r->luma_dc_quant_i[s->qscale];

  1210.     if(r->is16){

  1211.         memset(block16, 0, sizeof(block16));

  1212.         rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0);

  1213.         rv34_dequant4x4_16x16(block16, rv34_qscale_tab[luma_dc_quant],rv34_qscale_tab[s->qscale]);

  1214.         rv34_inv_transform_noround(block16);

  1215.     }

  1216. 

  1217.     for(i = 0; i < 16; i++, cbp >>= 1){

  1218.         if(!r->is16 && !(cbp & 1)) continue;

  1219.         blknum = ((i & 2) >> 1) + ((i & 8) >> 2);

  1220.         blkoff = ((i & 1) << 2) + ((i & 4) << 3);

  1221.         if(cbp & 1)

  1222.             rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->luma_vlc, 0);

  1223.         rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[s->qscale],rv34_qscale_tab[s->qscale]);

  1224.         if(r->is16) //FIXME: optimize

  1225.             s->block[blknum][blkoff] = block16[(i & 3) | ((i & 0xC) << 1)];

  1226.         rv34_inv_transform(s->block[blknum] + blkoff);

  1227.     }

  1228.     if(r->block_type == RV34_MB_P_MIX16x16)

  1229.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1230.     for(; i < 24; i++, cbp >>= 1){

  1231.         if(!(cbp & 1)) continue;

  1232.         blknum = ((i & 4) >> 2) + 4;

  1233.         blkoff = ((i & 1) << 2) + ((i & 2) << 4);

  1234.         rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->chroma_vlc, 1);

  1235.         rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]],rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]]);

  1236.         rv34_inv_transform(s->block[blknum] + blkoff);

  1237.     }

  1238.     if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos]))

  1239.         rv34_output_macroblock(r, intra_types, cbp2, r->is16);

  1240.     else

  1241.         rv34_apply_differences(r, cbp2);

  1242. 

  1243.     return 0;

  1244. }

  1245. 

  1246. static int check_slice_end(RV34DecContext *r, MpegEncContext *s)

  1247. {

  1248.     int bits;

  1249.     if(s->mb_y >= s->mb_height)

  1250.         return 1;

  1251.     if(!s->mb_num_left)

  1252.         return 1;

  1253.     if(r->s.mb_skip_run > 1)

  1254.         return 0;

  1255.     bits = r->bits - get_bits_count(&s->gb);

  1256.     if(bits < 0 || (bits < 8 && !show_bits(&s->gb, bits)))

  1257.         return 1;

  1258.     return 0;

  1259. }

  1260. 

  1261. static inline int slice_compare(SliceInfo *si1, SliceInfo *si2)

  1262. {

  1263.     return si1->type   != si2->type  ||

  1264.            si1->start  >= si2->start ||

  1265.            si1->width  != si2->width ||

  1266.            si1->height != si2->height||

  1267.            si1->pts    != si2->pts;

  1268. }

  1269. 

  1270. static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int buf_size)

  1271. {

  1272.     MpegEncContext *s = &r->s;

  1273.     GetBitContext *gb = &s->gb;

  1274.     int mb_pos;

  1275.     int res;

  1276. 

  1277.     init_get_bits(&r->s.gb, buf, buf_size*8);

  1278.     res = r->parse_slice_header(r, gb, &r->si);

  1279.     if(res < 0){

  1280.         av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");

  1281.         return -1;

  1282.     }

  1283. 

  1284.     if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr==NULL) {

  1285.         if(s->width != r->si.width || s->height != r->si.height){

  1286.             av_log(s->avctx, AV_LOG_DEBUG, "Changing dimensions to %dx%d\n", r->si.width,r->si.height);

  1287.             MPV_common_end(s);

  1288.             s->width  = r->si.width;

  1289.             s->height = r->si.height;

  1290.             avcodec_set_dimensions(s->avctx, s->width, s->height);

  1291.             if(MPV_common_init(s) < 0)

  1292.                 return -1;

  1293.             r->intra_types_stride = s->mb_width*4 + 4;

  1294.             r->intra_types_hist = av_realloc(r->intra_types_hist, r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1295.             r->intra_types = r->intra_types_hist + r->intra_types_stride * 4;

  1296.             r->mb_type = av_realloc(r->mb_type, r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));

  1297.             r->cbp_luma   = av_realloc(r->cbp_luma,   r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));

  1298.             r->cbp_chroma = av_realloc(r->cbp_chroma, r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));

  1299.             r->deblock_coefs = av_realloc(r->deblock_coefs, r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));

  1300.         }

  1301.         s->pict_type = r->si.type ? r->si.type : FF_I_TYPE;

  1302.         if(MPV_frame_start(s, s->avctx) < 0)

  1303.             return -1;

  1304.         ff_er_frame_start(s);

  1305.         r->cur_pts = r->si.pts;

  1306.         if(s->pict_type != FF_B_TYPE){

  1307.             r->last_pts = r->next_pts;

  1308.             r->next_pts = r->cur_pts;

  1309.         }

  1310.         s->mb_x = s->mb_y = 0;

  1311.     }

  1312. 

  1313.     r->si.end = end;

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

  1315.     r->bits = buf_size*8;

  1316.     s->mb_num_left = r->si.end - r->si.start;

  1317.     r->s.mb_skip_run = 0;

  1318. 

  1319.     mb_pos = s->mb_x + s->mb_y * s->mb_width;

  1320.     if(r->si.start != mb_pos){

  1321.         av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);

  1322.         s->mb_x = r->si.start % s->mb_width;

  1323.         s->mb_y = r->si.start / s->mb_width;

  1324.     }

  1325.     memset(r->intra_types_hist, -1, r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1326.     s->first_slice_line = 1;

  1327.     s->resync_mb_x= s->mb_x;

  1328.     s->resync_mb_y= s->mb_y;

  1329. 

  1330.     ff_init_block_index(s);

  1331.     while(!check_slice_end(r, s)) {

  1332.         ff_update_block_index(s);

  1333.         s->dsp.clear_blocks(s->block[0]);

  1334. 

  1335.         if(rv34_decode_macroblock(r, r->intra_types + s->mb_x * 4 + 4) < 0){

  1336.             ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);

  1337.             return -1;

  1338.         }

  1339.         if (++s->mb_x == s->mb_width) {

  1340.             s->mb_x = 0;

  1341.             s->mb_y++;

  1342.             ff_init_block_index(s);

  1343. 

  1344.             memmove(r->intra_types_hist, r->intra_types, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));

  1345.             memset(r->intra_types, -1, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));

  1346. 

  1347.             if(r->loop_filter && s->mb_y >= 2)

  1348.                 r->loop_filter(r, s->mb_y - 2);

  1349.         }

  1350.         if(s->mb_x == s->resync_mb_x)

  1351.             s->first_slice_line=0;

  1352.         s->mb_num_left--;

  1353.     }

  1354.     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);

  1355. 

  1356.     return s->mb_y == s->mb_height;

  1357. }

  1358. 

  1359. /** @} */ // recons group end

  1360. 

  1361. /**

  1362.  * Initialize decoder.

  1363.  */

  1364. av_cold int ff_rv34_decode_init(AVCodecContext *avctx)

  1365. {

  1366.     RV34DecContext *r = avctx->priv_data;

  1367.     MpegEncContext *s = &r->s;

  1368. 

  1369.     MPV_decode_defaults(s);

  1370.     s->avctx= avctx;

  1371.     s->out_format = FMT_H263;

  1372.     s->codec_id= avctx->codec_id;

  1373. 

  1374.     s->width = avctx->width;

  1375.     s->height = avctx->height;

  1376. 

  1377.     r->s.avctx = avctx;

  1378.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  1379.     r->s.flags |= CODEC_FLAG_EMU_EDGE;

  1380.     avctx->pix_fmt = PIX_FMT_YUV420P;

  1381.     avctx->has_b_frames = 1;

  1382.     s->low_delay = 0;

  1383. 

  1384.     if (MPV_common_init(s) < 0)

  1385.         return -1;

  1386. 

  1387.     ff_h264_pred_init(&r->h, CODEC_ID_RV40);

  1388. 

  1389.     r->intra_types_stride = 4*s->mb_stride + 4;

  1390.     r->intra_types_hist = av_malloc(r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1391.     r->intra_types = r->intra_types_hist + r->intra_types_stride * 4;

  1392. 

  1393.     r->mb_type = av_mallocz(r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));

  1394. 

  1395.     r->cbp_luma   = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));

  1396.     r->cbp_chroma = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));

  1397.     r->deblock_coefs = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));

  1398. 

  1399.     if(!intra_vlcs[0].cbppattern[0].bits)

  1400.         rv34_init_tables();

  1401. 

  1402.     return 0;

  1403. }

  1404. 

  1405. static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)

  1406. {

  1407.     if(avctx->slice_count) return avctx->slice_offset[n];

  1408.     else                   return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) :  AV_RB32(buf + n*8);

  1409. }

  1410. 

  1411. int ff_rv34_decode_frame(AVCodecContext *avctx,

  1412.                             void *data, int *data_size,

  1413.                             AVPacket *avpkt)

  1414. {

  1415.     const uint8_t *buf = avpkt->data;

  1416.     int buf_size = avpkt->size;

  1417.     RV34DecContext *r = avctx->priv_data;

  1418.     MpegEncContext *s = &r->s;

  1419.     AVFrame *pict = data;

  1420.     SliceInfo si;

  1421.     int i;

  1422.     int slice_count;

  1423.     const uint8_t *slices_hdr = NULL;

  1424.     int last = 0;

  1425. 

  1426.     /* no supplementary picture */

  1427.     if (buf_size == 0) {

  1428.         /* special case for last picture */

  1429.         if (s->low_delay==0 && s->next_picture_ptr) {

  1430.             *pict= *(AVFrame*)s->next_picture_ptr;

  1431.             s->next_picture_ptr= NULL;

  1432. 

  1433.             *data_size = sizeof(AVFrame);

  1434.         }

  1435.         return 0;

  1436.     }

  1437. 

  1438.     if(!avctx->slice_count){

  1439.         slice_count = (*buf++) + 1;

  1440.         slices_hdr = buf + 4;

  1441.         buf += 8 * slice_count;

  1442.     }else

  1443.         slice_count = avctx->slice_count;

  1444. 

  1445.     //parse first slice header to check whether this frame can be decoded

  1446.     if(get_slice_offset(avctx, slices_hdr, 0) > buf_size){

  1447.         av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");

  1448.         return -1;

  1449.     }

  1450.     init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), buf_size-get_slice_offset(avctx, slices_hdr, 0));

  1451.     if(r->parse_slice_header(r, &r->s.gb, &si) < 0 || si.start){

  1452.         av_log(avctx, AV_LOG_ERROR, "First slice header is incorrect\n");

  1453.         return -1;

  1454.     }

  1455.     if((!s->last_picture_ptr || !s->last_picture_ptr->data[0]) && si.type == FF_B_TYPE)

  1456.         return -1;

  1457.     /* skip b frames if we are in a hurry */

  1458.     if(avctx->hurry_up && si.type==FF_B_TYPE) return buf_size;

  1459.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && si.type==FF_B_TYPE)

  1460.        || (avctx->skip_frame >= AVDISCARD_NONKEY && si.type!=FF_I_TYPE)

  1461.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  1462.         return buf_size;

  1463.     /* skip everything if we are in a hurry>=5 */

  1464.     if(avctx->hurry_up>=5)

  1465.         return buf_size;

  1466. 

  1467.     for(i=0; i<slice_count; i++){

  1468.         int offset= get_slice_offset(avctx, slices_hdr, i);

  1469.         int size;

  1470.         if(i+1 == slice_count)

  1471.             size= buf_size - offset;

  1472.         else

  1473.             size= get_slice_offset(avctx, slices_hdr, i+1) - offset;

  1474. 

  1475.         if(offset > buf_size){

  1476.             av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");

  1477.             break;

  1478.         }

  1479. 

  1480.         r->si.end = s->mb_width * s->mb_height;

  1481.         if(i+1 < slice_count){

  1482.             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);

  1483.             if(r->parse_slice_header(r, &r->s.gb, &si) < 0){

  1484.                 if(i+2 < slice_count)

  1485.                     size = get_slice_offset(avctx, slices_hdr, i+2) - offset;

  1486.                 else

  1487.                     size = buf_size - offset;

  1488.             }else

  1489.                 r->si.end = si.start;

  1490.         }

  1491.         last = rv34_decode_slice(r, r->si.end, buf + offset, size);

  1492.         s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;

  1493.         if(last)

  1494.             break;

  1495.     }

  1496. 

  1497.     if(last){

  1498.         if(r->loop_filter)

  1499.             r->loop_filter(r, s->mb_height - 1);

  1500.         ff_er_frame_end(s);

  1501.         MPV_frame_end(s);

  1502.         if (s->pict_type == FF_B_TYPE || s->low_delay) {

  1503.             *pict= *(AVFrame*)s->current_picture_ptr;

  1504.         } else if (s->last_picture_ptr != NULL) {

  1505.             *pict= *(AVFrame*)s->last_picture_ptr;

  1506.         }

  1507. 

  1508.         if(s->last_picture_ptr || s->low_delay){

  1509.             *data_size = sizeof(AVFrame);

  1510.             ff_print_debug_info(s, pict);

  1511.         }

  1512.         s->current_picture_ptr= NULL; //so we can detect if frame_end wasnt called (find some nicer solution...)

  1513.     }

  1514.     return buf_size;

  1515. }

  1516. 

  1517. av_cold int ff_rv34_decode_end(AVCodecContext *avctx)

  1518. {

  1519.     RV34DecContext *r = avctx->priv_data;

  1520. 

  1521.     MPV_common_end(&r->s);

  1522. 

  1523.     av_freep(&r->intra_types_hist);

  1524.     r->intra_types = NULL;

  1525.     av_freep(&r->mb_type);

  1526.     av_freep(&r->cbp_luma);

  1527.     av_freep(&r->cbp_chroma);

  1528.     av_freep(&r->deblock_coefs);

  1529. 

  1530.     return 0;

  1531. }