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

  41. static const int rv34_mb_type_to_lavc[12] = {

  42.     MB_TYPE_INTRA,

  43.     MB_TYPE_INTRA16x16              | MB_TYPE_SEPARATE_DC,

  44.     MB_TYPE_16x16   | MB_TYPE_L0,

  45.     MB_TYPE_8x8     | MB_TYPE_L0,

  46.     MB_TYPE_16x16   | MB_TYPE_L0,

  47.     MB_TYPE_16x16   | MB_TYPE_L1,

  48.     MB_TYPE_SKIP,

  49.     MB_TYPE_DIRECT2 | MB_TYPE_16x16,

  50.     MB_TYPE_16x8    | MB_TYPE_L0,

  51.     MB_TYPE_8x16    | MB_TYPE_L0,

  52.     MB_TYPE_16x16   | MB_TYPE_L0L1,

  53.     MB_TYPE_16x16   | MB_TYPE_L0    | MB_TYPE_SEPARATE_DC

  54. };

  55. 

  56. 

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

  58. 

  59. /**

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

  61.  * @{

  62.  */

  63. 

  64. static const int table_offs[] = {

  65.       0,   1818,   3622,   4144,   4698,   5234,   5804,   5868,   5900,   5932,

  66.    5996,   6252,   6316,   6348,   6380,   7674,   8944,  10274,  11668,  12250,

  67.   14060,  15846,  16372,  16962,  17512,  18148,  18180,  18212,  18244,  18308,

  68.   18564,  18628,  18660,  18692,  20036,  21314,  22648,  23968,  24614,  26384,

  69.   28190,  28736,  29366,  29938,  30608,  30640,  30672,  30704,  30768,  31024,

  70.   31088,  31120,  31184,  32570,  33898,  35236,  36644,  37286,  39020,  40802,

  71.   41368,  42052,  42692,  43348,  43380,  43412,  43444,  43476,  43604,  43668,

  72.   43700,  43732,  45100,  46430,  47778,  49160,  49802,  51550,  53340,  53972,

  73.   54648,  55348,  55994,  56122,  56154,  56186,  56218,  56346,  56410,  56442,

  74.   56474,  57878,  59290,  60636,  62036,  62682,  64460,  64524,  64588,  64716,

  75.   64844,  66076,  67466,  67978,  68542,  69064,  69648,  70296,  72010,  72074,

  76.   72138,  72202,  72330,  73572,  74936,  75454,  76030,  76566,  77176,  77822,

  77.   79582,  79646,  79678,  79742,  79870,  81180,  82536,  83064,  83672,  84242,

  78.   84934,  85576,  87384,  87448,  87480,  87544,  87672,  88982,  90340,  90902,

  79.   91598,  92182,  92846,  93488,  95246,  95278,  95310,  95374,  95502,  96878,

  80.   98266,  98848,  99542, 100234, 100884, 101524, 103320, 103352, 103384, 103416,

  81.  103480, 104874, 106222, 106910, 107584, 108258, 108902, 109544, 111366, 111398,

  82.  111430, 111462, 111494, 112878, 114320, 114988, 115660, 116310, 116950, 117592

  83. };

  84. 

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

  86. 

  87. /**

  88.  * Generate VLC from codeword lengths.

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

  90.  * @param size   length of input data

  91.  * @param vlc    output VLC

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

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

  94.  */

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

  96.                          const int num)

  97. {

  98.     int i;

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

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

  101.     uint8_t bits2[size];

  102.     int maxbits = 0, realsize = 0;

  103. 

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

  105.         if(bits[i]){

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

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

  108.             realsize++;

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

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

  111.         }

  112.     }

  113. 

  114.     codes[0] = 0;

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

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

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

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

  119. 

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

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

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

  123.                     bits2, 1, 1,

  124.                     cw,    2, 2,

  125.                     syms,  2, 2, INIT_VLC_USE_NEW_STATIC);

  126. }

  127. 

  128. /**

  129.  * Initialize all tables.

  130.  */

  131. static av_cold void rv34_init_tables(void)

  132. {

  133.     int i, j, k;

  134. 

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

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

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

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

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

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

  141.                 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);

  142.             }

  143.         }

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

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

  146.         }

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

  148.     }

  149. 

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

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

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

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

  154.         }

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

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

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

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

  159.         }

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

  161.     }

  162. }

  163. 

  164. /** @} */ // vlc group

  165. 

  166. 

  167. /**

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

  169.  * @{

  170.  */

  171. 

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

  173. {

  174.     int i;

  175. 

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

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

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

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

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

  181. 

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

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

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

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

  186.     }

  187. }

  188. 

  189. /**

  190.  * Real Video 3.0/4.0 inverse transform

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

  192.  */

  193. static void rv34_inv_transform(DCTELEM *block){

  194.     int temp[16];

  195.     int i;

  196. 

  197.     rv34_row_transform(temp, block);

  198. 

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

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

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

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

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

  204. 

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

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

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

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

  209.     }

  210. 

  211. }

  212. 

  213. /**

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

  215.  *

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

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

  218.  */

  219. static void rv34_inv_transform_noround(DCTELEM *block){

  220.     int temp[16];

  221.     int i;

  222. 

  223.     rv34_row_transform(temp, block);

  224. 

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

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

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

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

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

  230. 

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

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

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

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

  235.     }

  236. 

  237. }

  238. 

  239. /** @} */ // transform

  240. 

  241. 

  242. /**

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

  244.  * @{

  245.  */

  246. 

  247. /**

  248.  * Decode coded block pattern.

  249.  */

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

  251. {

  252.     int pattern, code, cbp=0;

  253.     int ones;

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

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

  256.     const int *curshift = shifts;

  257.     int i, t, mask;

  258. 

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

  260.     pattern = code & 0xF;

  261.     code >>= 4;

  262. 

  263.     ones = rv34_count_ones[pattern];

  264. 

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

  266.         if(pattern & mask)

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

  268.     }

  269. 

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

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

  272.         if(t == 1)

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

  274.         if(t == 2)

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

  276.     }

  277.     return cbp;

  278. }

  279. 

  280. /**

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

  282.  */

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

  284. {

  285.     if(coef){

  286.         if(coef == esc){

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

  288.             if(coef > 23){

  289.                 coef -= 23;

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

  291.             }

  292.             coef += esc;

  293.         }

  294.         if(get_bits1(gb))

  295.             coef = -coef;

  296.         *dst = coef;

  297.     }

  298. }

  299. 

  300. /**

  301.  * Decode 2x2 subblock of coefficients.

  302.  */

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

  304. {

  305.     int coeffs[4];

  306. 

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

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

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

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

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

  312.     if(is_block2){

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

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

  315.     }else{

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

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

  318.     }

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

  320. }

  321. 

  322. /**

  323.  * Decode coefficients for 4x4 block.

  324.  *

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

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

  327.  *  o--o

  328.  *    /

  329.  *   /

  330.  *  o--o

  331.  */

  332. 

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

  334. {

  335.     int code, pattern;

  336. 

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

  338. 

  339.     pattern = code & 0x7;

  340. 

  341.     code >>= 3;

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

  343. 

  344.     if(pattern & 4){

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

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

  347.     }

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

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

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

  351.     }

  352.     if(pattern & 1){

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

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

  355.     }

  356. 

  357. }

  358. 

  359. /**

  360.  * Dequantize ordinary 4x4 block.

  361.  * @todo optimize

  362.  */

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

  364. {

  365.     int i, j;

  366. 

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

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

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

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

  371. }

  372. 

  373. /**

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

  375.  * @todo optimize

  376.  */

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

  378. {

  379.     int i;

  380. 

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

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

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

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

  385. }

  386. /** @} */ //block functions

  387. 

  388. 

  389. /**

  390.  * @defgroup bitstream RV30/40 bitstream parsing

  391.  * @{

  392.  */

  393. 

  394. /**

  395.  * Decode starting slice position.

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

  397.  */

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

  399. {

  400.     int i;

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

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

  403.             break;

  404.     return rv34_mb_bits_sizes[i];

  405. }

  406. 

  407. /**

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

  409.  */

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

  411. {

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

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

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

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

  416. }

  417. 

  418. /**

  419.  * Decode quantizer difference and return modified quantizer.

  420.  */

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

  422. {

  423.     if(get_bits1(gb))

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

  425.     else

  426.         return get_bits(gb, 5);

  427. }

  428. 

  429. /** @} */ //bitstream functions

  430. 

  431. /**

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

  433.  * @{

  434.  */

  435. 

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

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

  438. 

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

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

  441. 

  442. /** availability index for subblocks */

  443. static const uint8_t avail_indexes[4] = { 5, 6, 9, 10 };

  444. 

  445. /**

  446.  * motion vector prediction

  447.  *

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

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

  450.  * some other vectors may be used instead.

  451.  */

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

  453. {

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

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

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

  457.     int i, j;

  458.     int mx, my;

  459.     int avail_index = avail_indexes[subblock_no];

  460.     int c_off = part_sizes_w[block_type];

  461. 

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

  463.     if(subblock_no == 3)

  464.         c_off = -1;

  465. 

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

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

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

  469.     }

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

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

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

  473.     }else{

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

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

  476.     }

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

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

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

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

  481.         }else{

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

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

  484.         }

  485.     }else{

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

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

  488.     }

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

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

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

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

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

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

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

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

  497.         }

  498.     }

  499. }

  500. 

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

  502. 

  503. /**

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

  505.  */

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

  507. {

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

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

  510.     int mul;

  511. 

  512.     if(!refdist) return 0;

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

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

  515. }

  516. 

  517. /**

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

  519.  */

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

  521.                                       int A_avail, int B_avail, int C_avail,

  522.                                       int *mx, int *my)

  523. {

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

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

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

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

  528.             *mx /= 2;

  529.             *my /= 2;

  530.         }

  531.     }else{

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

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

  534.     }

  535. }

  536. 

  537. /**

  538.  * motion vector prediction for B-frames

  539.  */

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

  541. {

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

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

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

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

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

  547.     int mx, my;

  548.     int i, j;

  549.     Picture *cur_pic = s->current_picture_ptr;

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

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

  552. 

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

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

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

  556.     if((r->avail_cache[5-1] & type) & mask){

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

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

  559.         has_A = 1;

  560.     }

  561.     if((r->avail_cache[5-4] & type) & mask){

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

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

  564.         has_B = 1;

  565.     }

  566.     if(r->avail_cache[5-4] && (r->avail_cache[5-2] & type) & mask){

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

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

  569.         has_C = 1;

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

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

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

  573.         has_C = 1;

  574.     }

  575. 

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

  577. 

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

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

  580. 

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

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

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

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

  585.         }

  586.     }

  587.     if(block_type == RV34_MB_B_BACKWARD || block_type == RV34_MB_B_FORWARD)

  588.         fill_rectangle(cur_pic->motion_val[!dir][mv_pos], 2, 2, s->b8_stride, 0, 4);

  589. }

  590. 

  591. /**

  592.  * motion vector prediction - RV3 version

  593.  */

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

  595. {

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

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

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

  599.     int i, j, k;

  600.     int mx, my;

  601.     int avail_index = avail_indexes[0];

  602. 

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

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

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

  606.     }

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

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

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

  610.     }else{

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

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

  613.     }

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

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

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

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

  618.         }else{

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

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

  621.         }

  622.     }else{

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

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

  625.     }

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

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

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

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

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

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

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

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

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

  635.             }

  636.         }

  637.     }

  638. }

  639. 

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

  641. 

  642. /**

  643.  * generic motion compensation function

  644.  *

  645.  * @param r decoder context

  646.  * @param block_type type of the current block

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

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

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

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

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

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

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

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

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

  656.  */

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

  658.                           const int xoff, const int yoff, int mv_off,

  659.                           const int width, const int height, int dir,

  660.                           const int thirdpel,

  661.                           qpel_mc_func (*qpel_mc)[16],

  662.                           h264_chroma_mc_func (*chroma_mc))

  663. {

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

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

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

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

  668.     int is16x16 = 1;

  669. 

  670.     if(thirdpel){

  671.         int chroma_mx, chroma_my;

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

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

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

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

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

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

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

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

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

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

  682.     }else{

  683.         int cx, cy;

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

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

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

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

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

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

  690.         umx = cx >> 2;

  691.         umy = cy >> 2;

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

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

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

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

  696.             uvmx = uvmy = 4;

  697.     }

  698.     dxy = ly*4 + lx;

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

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

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

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

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

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

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

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

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

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

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

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

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

  712. 

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

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

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

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

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

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

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

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

  721.         srcU = uvbuf;

  722.         srcV = uvbuf + 16;

  723.     }

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

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

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

  727. 

  728.     if(block_type == RV34_MB_P_16x8){

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

  730.         Y    += 8;

  731.         srcY += 8;

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

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

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

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

  736.     }

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

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

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

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

  741. }

  742. 

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

  744.                         const int xoff, const int yoff, int mv_off,

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

  746. {

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

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

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

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

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

  752. }

  753. 

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

  755. {

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

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

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

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

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

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

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

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

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

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

  766. }

  767. 

  768. static void rv34_mc_2mv_skip(RV34DecContext *r)

  769. {

  770.     int i, j;

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

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

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

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

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

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

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

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

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

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

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

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

  783.         }

  784. }

  785. 

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

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

  788. 

  789. /**

  790.  * Decode motion vector differences

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

  792.  */

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

  794. {

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

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

  797.     int i, j, k, l;

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

  799.     int next_bt;

  800. 

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

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

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

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

  805.     }

  806.     switch(block_type){

  807.     case RV34_MB_TYPE_INTRA:

  808.     case RV34_MB_TYPE_INTRA16x16:

  809.         fill_rectangle(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], 2, 2, s->b8_stride, 0, 4);

  810.         return 0;

  811.     case RV34_MB_SKIP:

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

  813.             fill_rectangle(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], 2, 2, s->b8_stride, 0, 4);

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

  815.             break;

  816.         }

  817.     case RV34_MB_B_DIRECT:

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

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

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

  821.             fill_rectangle(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], 2, 2, s->b8_stride, 0, 4);

  822.             fill_rectangle(s->current_picture_ptr->motion_val[1][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], 2, 2, s->b8_stride, 0, 4);

  823.         }else

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

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

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

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

  828.                             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]);

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

  830.             rv34_mc_2mv(r, block_type);

  831.         else

  832.             rv34_mc_2mv_skip(r);

  833.         fill_rectangle(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], 2, 2, s->b8_stride, 0, 4);

  834.         break;

  835.     case RV34_MB_P_16x16:

  836.     case RV34_MB_P_MIX16x16:

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

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

  839.         break;

  840.     case RV34_MB_B_FORWARD:

  841.     case RV34_MB_B_BACKWARD:

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

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

  844.         if(r->rv30)

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

  846.         else

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

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

  849.         break;

  850.     case RV34_MB_P_16x8:

  851.     case RV34_MB_P_8x16:

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

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

  854.         if(block_type == RV34_MB_P_16x8){

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

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

  857.         }

  858.         if(block_type == RV34_MB_P_8x16){

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

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

  861.         }

  862.         break;

  863.     case RV34_MB_B_BIDIR:

  864.         rv34_pred_mv_b  (r, block_type, 0);

  865.         rv34_pred_mv_b  (r, block_type, 1);

  866.         rv34_mc_2mv     (r, block_type);

  867.         break;

  868.     case RV34_MB_P_8x8:

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

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

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

  872.         }

  873.         break;

  874.     }

  875. 

  876.     return 0;

  877. }

  878. /** @} */ // mv group

  879. 

  880. /**

  881.  * @defgroup recons Macroblock reconstruction functions

  882.  * @{

  883.  */

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

  885. static const int ittrans[9] = {

  886.  DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,

  887.  VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,

  888. };

  889. 

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

  891. static const int ittrans16[4] = {

  892.  DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,

  893. };

  894. 

  895. /**

  896.  * Perform 4x4 intra prediction.

  897.  */

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

  899. {

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

  901.     uint32_t topleft;

  902. 

  903.     if(!up && !left)

  904.         itype = DC_128_PRED;

  905.     else if(!up){

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

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

  908.     }else if(!left){

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

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

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

  912.     }

  913.     if(!down){

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

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

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

  917.     }

  918.     if(!right && up){

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

  920.         prev = (uint8_t*)&topleft;

  921.     }

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

  923. }

  924. 

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

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

  927. {

  928.     int x, y;

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

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

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

  932. }

  933. 

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

  935. {

  936.     if(!up && !left)

  937.         itype = DC_128_PRED8x8;

  938.     else if(!up){

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

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

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

  942.     }else if(!left){

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

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

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

  946.     }

  947.     return itype;

  948. }

  949. 

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

  951. {

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

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

  954.     int i, j;

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

  956.     int itype;

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

  958.     int idx;

  959. 

  960.     // Set neighbour information.

  961.     if(r->avail_cache[0])

  962.         avail[0] = 1;

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

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

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

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

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

  968.         avail[5] = 1;

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

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

  971.     if(r->avail_cache[8])

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

  973. 

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

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

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

  977.     if(!is16){

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

  979.             idx = 9 + j*8;

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

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

  982.                 avail[idx] = 1;

  983.                 if(cbp & 1)

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

  985.             }

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

  987.             intra_types += s->b4_stride;

  988.         }

  989.         intra_types -= s->b4_stride * 4;

  990.         fill_rectangle(r->avail_cache + 5, 2, 2, 4, 0, 4);

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

  992.             idx = 5 + j*4;

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

  994.                 rv34_pred_4x4_block(r, U + i*4 + j*4*s->uvlinesize, s->uvlinesize, ittrans[intra_types[i*2+j*2*s->b4_stride]], r->avail_cache[idx-4], r->avail_cache[idx-1], !i && !j, r->avail_cache[idx-3]);

  995.                 rv34_pred_4x4_block(r, V + i*4 + j*4*s->uvlinesize, s->uvlinesize, ittrans[intra_types[i*2+j*2*s->b4_stride]], r->avail_cache[idx-4], r->avail_cache[idx-1], !i && !j, r->avail_cache[idx-3]);

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

  997.                 if(cbp & 0x01)

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

  999.                 if(cbp & 0x10)

  1000.                     rv34_add_4x4_block(V + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[5], i*4+j*32);

  1001.             }

  1002.         }

  1003.     }else{

  1004.         itype = ittrans16[intra_types[0]];

  1005.         itype = adjust_pred16(itype, r->avail_cache[5-4], r->avail_cache[5-1]);

  1006.         r->h.pred16x16[itype](Y, s->linesize);

  1007.         dsp->add_pixels_clamped(s->block[0], Y,     s->linesize);

  1008.         dsp->add_pixels_clamped(s->block[1], Y + 8, s->linesize);

  1009.         Y += s->linesize * 8;

  1010.         dsp->add_pixels_clamped(s->block[2], Y,     s->linesize);

  1011.         dsp->add_pixels_clamped(s->block[3], Y + 8, s->linesize);

  1012. 

  1013.         itype = ittrans16[intra_types[0]];

  1014.         if(itype == PLANE_PRED8x8) itype = DC_PRED8x8;

  1015.         itype = adjust_pred16(itype, r->avail_cache[5-4], r->avail_cache[5-1]);

  1016.         r->h.pred8x8[itype](U, s->uvlinesize);

  1017.         dsp->add_pixels_clamped(s->block[4], U, s->uvlinesize);

  1018.         r->h.pred8x8[itype](V, s->uvlinesize);

  1019.         dsp->add_pixels_clamped(s->block[5], V, s->uvlinesize);

  1020.     }

  1021. }

  1022. 

  1023. /** @} */ // recons group

  1024. 

  1025. /**

  1026.  * @addtogroup bitstream

  1027.  * Decode macroblock header and return CBP in case of success, -1 otherwise.

  1028.  */

  1029. static int rv34_decode_mb_header(RV34DecContext *r, int8_t *intra_types)

  1030. {

  1031.     MpegEncContext *s = &r->s;

  1032.     GetBitContext *gb = &s->gb;

  1033.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1034.     int i, t;

  1035. 

  1036.     if(!r->si.type){

  1037.         r->is16 = get_bits1(gb);

  1038.         if(!r->is16 && !r->rv30){

  1039.             if(!get_bits1(gb))

  1040.                 av_log(s->avctx, AV_LOG_ERROR, "Need DQUANT\n");

  1041.         }

  1042.         s->current_picture_ptr->mb_type[mb_pos] = r->is16 ? MB_TYPE_INTRA16x16 : MB_TYPE_INTRA;

  1043.         r->block_type = r->is16 ? RV34_MB_TYPE_INTRA16x16 : RV34_MB_TYPE_INTRA;

  1044.     }else{

  1045.         r->block_type = r->decode_mb_info(r);

  1046.         if(r->block_type == -1)

  1047.             return -1;

  1048.         s->current_picture_ptr->mb_type[mb_pos] = rv34_mb_type_to_lavc[r->block_type];

  1049.         r->mb_type[mb_pos] = r->block_type;

  1050.         if(r->block_type == RV34_MB_SKIP){

  1051.             if(s->pict_type == FF_P_TYPE)

  1052.                 r->mb_type[mb_pos] = RV34_MB_P_16x16;

  1053.             if(s->pict_type == FF_B_TYPE)

  1054.                 r->mb_type[mb_pos] = RV34_MB_B_DIRECT;

  1055.         }

  1056.         r->is16 = !!IS_INTRA16x16(s->current_picture_ptr->mb_type[mb_pos]);

  1057.         rv34_decode_mv(r, r->block_type);

  1058.         if(r->block_type == RV34_MB_SKIP){

  1059.             fill_rectangle(intra_types, 4, 4, s->b4_stride, 0, sizeof(intra_types[0]));

  1060.             return 0;

  1061.         }

  1062.         r->chroma_vlc = 1;

  1063.         r->luma_vlc   = 0;

  1064.     }

  1065.     if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){

  1066.         if(r->is16){

  1067.             t = get_bits(gb, 2);

  1068.             fill_rectangle(intra_types, 4, 4, s->b4_stride, t, sizeof(intra_types[0]));

  1069.             r->luma_vlc   = 2;

  1070.         }else{

  1071.             if(r->decode_intra_types(r, gb, intra_types) < 0)

  1072.                 return -1;

  1073.             r->luma_vlc   = 1;

  1074.         }

  1075.         r->chroma_vlc = 0;

  1076.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);

  1077.     }else{

  1078.         for(i = 0; i < 16; i++)

  1079.             intra_types[(i & 3) + (i>>2) * s->b4_stride] = 0;

  1080.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1081.         if(r->mb_type[mb_pos] == RV34_MB_P_MIX16x16){

  1082.             r->is16 = 1;

  1083.             r->chroma_vlc = 1;

  1084.             r->luma_vlc   = 2;

  1085.             r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);

  1086.         }

  1087.     }

  1088. 

  1089.     return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);

  1090. }

  1091. 

  1092. /**

  1093.  * @addtogroup recons

  1094.  * @{

  1095.  */

  1096. /**

  1097.  * mask for retrieving all bits in coded block pattern

  1098.  * corresponding to one 8x8 block

  1099.  */

  1100. #define LUMA_CBP_BLOCK_MASK 0x33

  1101. 

  1102. #define U_CBP_MASK 0x0F0000

  1103. #define V_CBP_MASK 0xF00000

  1104. 

  1105. 

  1106. static void rv34_apply_differences(RV34DecContext *r, int cbp)

  1107. {

  1108.     static const int shifts[4] = { 0, 2, 8, 10 };

  1109.     MpegEncContext *s = &r->s;

  1110.     int i;

  1111. 

  1112.     for(i = 0; i < 4; i++)

  1113.         if((cbp & (LUMA_CBP_BLOCK_MASK << shifts[i])) || r->block_type == RV34_MB_P_MIX16x16)

  1114.             s->dsp.add_pixels_clamped(s->block[i], s->dest[0] + (i & 1)*8 + (i&2)*4*s->linesize, s->linesize);

  1115.     if(cbp & U_CBP_MASK)

  1116.         s->dsp.add_pixels_clamped(s->block[4], s->dest[1], s->uvlinesize);

  1117.     if(cbp & V_CBP_MASK)

  1118.         s->dsp.add_pixels_clamped(s->block[5], s->dest[2], s->uvlinesize);

  1119. }

  1120. 

  1121. static int is_mv_diff_gt_3(int16_t (*motion_val)[2], int step)

  1122. {

  1123.     int d;

  1124.     d = motion_val[0][0] - motion_val[-step][0];

  1125.     if(d < -3 || d > 3)

  1126.         return 1;

  1127.     d = motion_val[0][1] - motion_val[-step][1];

  1128.     if(d < -3 || d > 3)

  1129.         return 1;

  1130.     return 0;

  1131. }

  1132. 

  1133. static int rv34_set_deblock_coef(RV34DecContext *r)

  1134. {

  1135.     MpegEncContext *s = &r->s;

  1136.     int hmvmask = 0, vmvmask = 0, i, j;

  1137.     int midx = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;

  1138.     int16_t (*motion_val)[2] = s->current_picture_ptr->motion_val[0][midx];

  1139.     for(j = 0; j < 16; j += 8){

  1140.         for(i = 0; i < 2; i++){

  1141.             if(is_mv_diff_gt_3(motion_val + i, 1))

  1142.                 vmvmask |= 0x11 << (j + i*2);

  1143.             if((j || s->mb_y) && is_mv_diff_gt_3(motion_val + i, s->b8_stride))

  1144.                 hmvmask |= 0x03 << (j + i*2);

  1145.         }

  1146.         motion_val += s->b8_stride;

  1147.     }

  1148.     if(s->first_slice_line)

  1149.         hmvmask &= ~0x000F;

  1150.     if(!s->mb_x)

  1151.         vmvmask &= ~0x1111;

  1152.     if(r->rv30){ //RV30 marks both subblocks on the edge for filtering

  1153.         vmvmask |= (vmvmask & 0x4444) >> 1;

  1154.         hmvmask |= (hmvmask & 0x0F00) >> 4;

  1155.         if(s->mb_x)

  1156.             r->deblock_coefs[s->mb_x - 1 + s->mb_y*s->mb_stride] |= (vmvmask & 0x1111) << 3;

  1157.         if(!s->first_slice_line)

  1158.             r->deblock_coefs[s->mb_x + (s->mb_y - 1)*s->mb_stride] |= (hmvmask & 0xF) << 12;

  1159.     }

  1160.     return hmvmask | vmvmask;

  1161. }

  1162. 

  1163. static int rv34_decode_macroblock(RV34DecContext *r, int8_t *intra_types)

  1164. {

  1165.     MpegEncContext *s = &r->s;

  1166.     GetBitContext *gb = &s->gb;

  1167.     int cbp, cbp2;

  1168.     int i, blknum, blkoff;

  1169.     DCTELEM block16[64];

  1170.     int luma_dc_quant;

  1171.     int dist;

  1172.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1173. 

  1174.     // Calculate which neighbours are available. Maybe it's worth optimizing too.

  1175.     memset(r->avail_cache, 0, sizeof(r->avail_cache));

  1176.     fill_rectangle(r->avail_cache + 5, 2, 2, 4, 1, 4);

  1177.     dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;

  1178.     if(s->mb_x && dist)

  1179.         r->avail_cache[4] =

  1180.         r->avail_cache[8] = s->current_picture_ptr->mb_type[mb_pos - 1];

  1181.     if(dist >= s->mb_width)

  1182.         r->avail_cache[1] =

  1183.         r->avail_cache[2] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];

  1184.     if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)

  1185.         r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];

  1186.     if(s->mb_x && dist > s->mb_width)

  1187.         r->avail_cache[0] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];

  1188. 

  1189.     s->qscale = r->si.quant;

  1190.     cbp = cbp2 = rv34_decode_mb_header(r, intra_types);

  1191.     r->cbp_luma  [mb_pos] = cbp;

  1192.     r->cbp_chroma[mb_pos] = cbp >> 16;

  1193.     if(s->pict_type == FF_I_TYPE)

  1194.         r->deblock_coefs[mb_pos] = 0xFFFF;

  1195.     else

  1196.         r->deblock_coefs[mb_pos] = rv34_set_deblock_coef(r) | r->cbp_luma[mb_pos];

  1197.     s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;

  1198. 

  1199.     if(cbp == -1)

  1200.         return -1;

  1201. 

  1202.     luma_dc_quant = r->block_type == RV34_MB_P_MIX16x16 ? r->luma_dc_quant_p[s->qscale] : r->luma_dc_quant_i[s->qscale];

  1203.     if(r->is16){

  1204.         memset(block16, 0, sizeof(block16));

  1205.         rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0);

  1206.         rv34_dequant4x4_16x16(block16, rv34_qscale_tab[luma_dc_quant],rv34_qscale_tab[s->qscale]);

  1207.         rv34_inv_transform_noround(block16);

  1208.     }

  1209. 

  1210.     for(i = 0; i < 16; i++, cbp >>= 1){

  1211.         if(!r->is16 && !(cbp & 1)) continue;

  1212.         blknum = ((i & 2) >> 1) + ((i & 8) >> 2);

  1213.         blkoff = ((i & 1) << 2) + ((i & 4) << 3);

  1214.         if(cbp & 1)

  1215.             rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->luma_vlc, 0);

  1216.         rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[s->qscale],rv34_qscale_tab[s->qscale]);

  1217.         if(r->is16) //FIXME: optimize

  1218.             s->block[blknum][blkoff] = block16[(i & 3) | ((i & 0xC) << 1)];

  1219.         rv34_inv_transform(s->block[blknum] + blkoff);

  1220.     }

  1221.     if(r->block_type == RV34_MB_P_MIX16x16)

  1222.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1223.     for(; i < 24; i++, cbp >>= 1){

  1224.         if(!(cbp & 1)) continue;

  1225.         blknum = ((i & 4) >> 2) + 4;

  1226.         blkoff = ((i & 1) << 2) + ((i & 2) << 4);

  1227.         rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->chroma_vlc, 1);

  1228.         rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]],rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]]);

  1229.         rv34_inv_transform(s->block[blknum] + blkoff);

  1230.     }

  1231.     if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos]))

  1232.         rv34_output_macroblock(r, intra_types, cbp2, r->is16);

  1233.     else

  1234.         rv34_apply_differences(r, cbp2);

  1235. 

  1236.     return 0;

  1237. }

  1238. 

  1239. static int check_slice_end(RV34DecContext *r, MpegEncContext *s)

  1240. {

  1241.     int bits;

  1242.     if(s->mb_y >= s->mb_height)

  1243.         return 1;

  1244.     if(!s->mb_num_left)

  1245.         return 1;

  1246.     if(r->s.mb_skip_run > 1)

  1247.         return 0;

  1248.     bits = r->bits - get_bits_count(&s->gb);

  1249.     if(bits < 0 || (bits < 8 && !show_bits(&s->gb, bits)))

  1250.         return 1;

  1251.     return 0;

  1252. }

  1253. 

  1254. static inline int slice_compare(SliceInfo *si1, SliceInfo *si2)

  1255. {

  1256.     return si1->type   != si2->type  ||

  1257.            si1->start  >= si2->start ||

  1258.            si1->width  != si2->width ||

  1259.            si1->height != si2->height||

  1260.            si1->pts    != si2->pts;

  1261. }

  1262. 

  1263. static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int buf_size)

  1264. {

  1265.     MpegEncContext *s = &r->s;

  1266.     GetBitContext *gb = &s->gb;

  1267.     int mb_pos;

  1268.     int res;

  1269. 

  1270.     init_get_bits(&r->s.gb, buf, buf_size*8);

  1271.     res = r->parse_slice_header(r, gb, &r->si);

  1272.     if(res < 0){

  1273.         av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");

  1274.         return -1;

  1275.     }

  1276. 

  1277.     if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr==NULL) {

  1278.         if(s->width != r->si.width || s->height != r->si.height){

  1279.             av_log(s->avctx, AV_LOG_DEBUG, "Changing dimensions to %dx%d\n", r->si.width,r->si.height);

  1280.             MPV_common_end(s);

  1281.             s->width  = r->si.width;

  1282.             s->height = r->si.height;

  1283.             if(MPV_common_init(s) < 0)

  1284.                 return -1;

  1285.             r->intra_types_hist = av_realloc(r->intra_types_hist, s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1286.             r->intra_types = r->intra_types_hist + s->b4_stride * 4;

  1287.             r->mb_type = av_realloc(r->mb_type, r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));

  1288.             r->cbp_luma   = av_realloc(r->cbp_luma,   r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));

  1289.             r->cbp_chroma = av_realloc(r->cbp_chroma, r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));

  1290.             r->deblock_coefs = av_realloc(r->deblock_coefs, r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));

  1291.         }

  1292.         s->pict_type = r->si.type ? r->si.type : FF_I_TYPE;

  1293.         if(MPV_frame_start(s, s->avctx) < 0)

  1294.             return -1;

  1295.         ff_er_frame_start(s);

  1296.         r->cur_pts = r->si.pts;

  1297.         if(s->pict_type != FF_B_TYPE){

  1298.             r->last_pts = r->next_pts;

  1299.             r->next_pts = r->cur_pts;

  1300.         }

  1301.         s->mb_x = s->mb_y = 0;

  1302.     }

  1303. 

  1304.     r->si.end = end;

  1305.     s->qscale = r->si.quant;

  1306.     r->bits = buf_size*8;

  1307.     s->mb_num_left = r->si.end - r->si.start;

  1308.     r->s.mb_skip_run = 0;

  1309. 

  1310.     mb_pos = s->mb_x + s->mb_y * s->mb_width;

  1311.     if(r->si.start != mb_pos){

  1312.         av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);

  1313.         s->mb_x = r->si.start % s->mb_width;

  1314.         s->mb_y = r->si.start / s->mb_width;

  1315.     }

  1316.     memset(r->intra_types_hist, -1, s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1317.     s->first_slice_line = 1;

  1318.     s->resync_mb_x= s->mb_x;

  1319.     s->resync_mb_y= s->mb_y;

  1320. 

  1321.     ff_init_block_index(s);

  1322.     while(!check_slice_end(r, s)) {

  1323.         ff_update_block_index(s);

  1324.         s->dsp.clear_blocks(s->block[0]);

  1325. 

  1326.         if(rv34_decode_macroblock(r, r->intra_types + s->mb_x * 4 + 1) < 0){

  1327.             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);

  1328.             return -1;

  1329.         }

  1330.         if (++s->mb_x == s->mb_width) {

  1331.             s->mb_x = 0;

  1332.             s->mb_y++;

  1333.             ff_init_block_index(s);

  1334. 

  1335.             memmove(r->intra_types_hist, r->intra_types, s->b4_stride * 4 * sizeof(*r->intra_types_hist));

  1336.             memset(r->intra_types, -1, s->b4_stride * 4 * sizeof(*r->intra_types_hist));

  1337. 

  1338.             if(r->loop_filter && s->mb_y >= 2)

  1339.                 r->loop_filter(r, s->mb_y - 2);

  1340.         }

  1341.         if(s->mb_x == s->resync_mb_x)

  1342.             s->first_slice_line=0;

  1343.         s->mb_num_left--;

  1344.     }

  1345.     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);

  1346. 

  1347.     return s->mb_y == s->mb_height;

  1348. }

  1349. 

  1350. /** @} */ // recons group end

  1351. 

  1352. /**

  1353.  * Initialize decoder.

  1354.  */

  1355. av_cold int ff_rv34_decode_init(AVCodecContext *avctx)

  1356. {

  1357.     RV34DecContext *r = avctx->priv_data;

  1358.     MpegEncContext *s = &r->s;

  1359. 

  1360.     MPV_decode_defaults(s);

  1361.     s->avctx= avctx;

  1362.     s->out_format = FMT_H263;

  1363.     s->codec_id= avctx->codec_id;

  1364. 

  1365.     s->width = avctx->width;

  1366.     s->height = avctx->height;

  1367. 

  1368.     r->s.avctx = avctx;

  1369.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  1370.     r->s.flags |= CODEC_FLAG_EMU_EDGE;

  1371.     avctx->pix_fmt = PIX_FMT_YUV420P;

  1372.     avctx->has_b_frames = 1;

  1373.     s->low_delay = 0;

  1374. 

  1375.     if (MPV_common_init(s) < 0)

  1376.         return -1;

  1377. 

  1378.     ff_h264_pred_init(&r->h, CODEC_ID_RV40);

  1379. 

  1380.     r->intra_types_hist = av_malloc(s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1381.     r->intra_types = r->intra_types_hist + s->b4_stride * 4;

  1382. 

  1383.     r->mb_type = av_mallocz(r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));

  1384. 

  1385.     r->cbp_luma   = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));

  1386.     r->cbp_chroma = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));

  1387.     r->deblock_coefs = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));

  1388. 

  1389.     if(!intra_vlcs[0].cbppattern[0].bits)

  1390.         rv34_init_tables();

  1391. 

  1392.     return 0;

  1393. }

  1394. 

  1395. static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)

  1396. {

  1397.     if(avctx->slice_count) return avctx->slice_offset[n];

  1398.     else                   return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) :  AV_RB32(buf + n*8);

  1399. }

  1400. 

  1401. int ff_rv34_decode_frame(AVCodecContext *avctx,

  1402.                             void *data, int *data_size,

  1403.                             AVPacket *avpkt)

  1404. {

  1405.     const uint8_t *buf = avpkt->data;

  1406.     int buf_size = avpkt->size;

  1407.     RV34DecContext *r = avctx->priv_data;

  1408.     MpegEncContext *s = &r->s;

  1409.     AVFrame *pict = data;

  1410.     SliceInfo si;

  1411.     int i;

  1412.     int slice_count;

  1413.     const uint8_t *slices_hdr = NULL;

  1414.     int last = 0;

  1415. 

  1416.     /* no supplementary picture */

  1417.     if (buf_size == 0) {

  1418.         /* special case for last picture */

  1419.         if (s->low_delay==0 && s->next_picture_ptr) {

  1420.             *pict= *(AVFrame*)s->next_picture_ptr;

  1421.             s->next_picture_ptr= NULL;

  1422. 

  1423.             *data_size = sizeof(AVFrame);

  1424.         }

  1425.         return 0;

  1426.     }

  1427. 

  1428.     if(!avctx->slice_count){

  1429.         slice_count = (*buf++) + 1;

  1430.         slices_hdr = buf + 4;

  1431.         buf += 8 * slice_count;

  1432.     }else

  1433.         slice_count = avctx->slice_count;

  1434. 

  1435.     //parse first slice header to check whether this frame can be decoded

  1436.     if(get_slice_offset(avctx, slices_hdr, 0) > buf_size){

  1437.         av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");

  1438.         return -1;

  1439.     }

  1440.     init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), buf_size-get_slice_offset(avctx, slices_hdr, 0));

  1441.     if(r->parse_slice_header(r, &r->s.gb, &si) < 0 || si.start){

  1442.         av_log(avctx, AV_LOG_ERROR, "First slice header is incorrect\n");

  1443.         return -1;

  1444.     }

  1445.     if((!s->last_picture_ptr || !s->last_picture_ptr->data[0]) && si.type == FF_B_TYPE)

  1446.         return -1;

  1447.     /* skip b frames if we are in a hurry */

  1448.     if(avctx->hurry_up && si.type==FF_B_TYPE) return buf_size;

  1449.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && si.type==FF_B_TYPE)

  1450.        || (avctx->skip_frame >= AVDISCARD_NONKEY && si.type!=FF_I_TYPE)

  1451.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  1452.         return buf_size;

  1453.     /* skip everything if we are in a hurry>=5 */

  1454.     if(avctx->hurry_up>=5)

  1455.         return buf_size;

  1456. 

  1457.     for(i=0; i<slice_count; i++){

  1458.         int offset= get_slice_offset(avctx, slices_hdr, i);

  1459.         int size;

  1460.         if(i+1 == slice_count)

  1461.             size= buf_size - offset;

  1462.         else

  1463.             size= get_slice_offset(avctx, slices_hdr, i+1) - offset;

  1464. 

  1465.         if(offset > buf_size){

  1466.             av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");

  1467.             break;

  1468.         }

  1469. 

  1470.         r->si.end = s->mb_width * s->mb_height;

  1471.         if(i+1 < slice_count){

  1472.             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);

  1473.             if(r->parse_slice_header(r, &r->s.gb, &si) < 0){

  1474.                 if(i+2 < slice_count)

  1475.                     size = get_slice_offset(avctx, slices_hdr, i+2) - offset;

  1476.                 else

  1477.                     size = buf_size - offset;

  1478.             }else

  1479.                 r->si.end = si.start;

  1480.         }

  1481.         last = rv34_decode_slice(r, r->si.end, buf + offset, size);

  1482.         s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;

  1483.         if(last)

  1484.             break;

  1485.     }

  1486. 

  1487.     if(last){

  1488.         if(r->loop_filter)

  1489.             r->loop_filter(r, s->mb_height - 1);

  1490.         ff_er_frame_end(s);

  1491.         MPV_frame_end(s);

  1492.         if (s->pict_type == FF_B_TYPE || s->low_delay) {

  1493.             *pict= *(AVFrame*)s->current_picture_ptr;

  1494.         } else if (s->last_picture_ptr != NULL) {

  1495.             *pict= *(AVFrame*)s->last_picture_ptr;

  1496.         }

  1497. 

  1498.         if(s->last_picture_ptr || s->low_delay){

  1499.             *data_size = sizeof(AVFrame);

  1500.             ff_print_debug_info(s, pict);

  1501.         }

  1502.         s->current_picture_ptr= NULL; //so we can detect if frame_end wasnt called (find some nicer solution...)

  1503.     }

  1504.     return buf_size;

  1505. }

  1506. 

  1507. av_cold int ff_rv34_decode_end(AVCodecContext *avctx)

  1508. {

  1509.     RV34DecContext *r = avctx->priv_data;

  1510. 

  1511.     MPV_common_end(&r->s);

  1512. 

  1513.     av_freep(&r->intra_types_hist);

  1514.     r->intra_types = NULL;

  1515.     av_freep(&r->mb_type);

  1516.     av_freep(&r->cbp_luma);

  1517.     av_freep(&r->cbp_chroma);

  1518.     av_freep(&r->deblock_coefs);

  1519. 

  1520.     return 0;

  1521. }