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FFmpeg/libavcodec/rv34.c

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  1. /*

  2.  * RV30/40 decoder common data

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * RV30/40 decoder common data

  25.  */

  26. 

  27. #include "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. static int rv34_decode_mv(RV34DecContext *r, int block_type);

  66. 

  67. /**

  68.  * @name RV30/40 VLC generating functions

  69.  * @{

  70.  */

  71. 

  72. static const int table_offs[] = {

  73.       0,   1818,   3622,   4144,   4698,   5234,   5804,   5868,   5900,   5932,

  74.    5996,   6252,   6316,   6348,   6380,   7674,   8944,  10274,  11668,  12250,

  75.   14060,  15846,  16372,  16962,  17512,  18148,  18180,  18212,  18244,  18308,

  76.   18564,  18628,  18660,  18692,  20036,  21314,  22648,  23968,  24614,  26384,

  77.   28190,  28736,  29366,  29938,  30608,  30640,  30672,  30704,  30768,  31024,

  78.   31088,  31120,  31184,  32570,  33898,  35236,  36644,  37286,  39020,  40802,

  79.   41368,  42052,  42692,  43348,  43380,  43412,  43444,  43476,  43604,  43668,

  80.   43700,  43732,  45100,  46430,  47778,  49160,  49802,  51550,  53340,  53972,

  81.   54648,  55348,  55994,  56122,  56154,  56186,  56218,  56346,  56410,  56442,

  82.   56474,  57878,  59290,  60636,  62036,  62682,  64460,  64524,  64588,  64716,

  83.   64844,  66076,  67466,  67978,  68542,  69064,  69648,  70296,  72010,  72074,

  84.   72138,  72202,  72330,  73572,  74936,  75454,  76030,  76566,  77176,  77822,

  85.   79582,  79646,  79678,  79742,  79870,  81180,  82536,  83064,  83672,  84242,

  86.   84934,  85576,  87384,  87448,  87480,  87544,  87672,  88982,  90340,  90902,

  87.   91598,  92182,  92846,  93488,  95246,  95278,  95310,  95374,  95502,  96878,

  88.   98266,  98848,  99542, 100234, 100884, 101524, 103320, 103352, 103384, 103416,

  89.  103480, 104874, 106222, 106910, 107584, 108258, 108902, 109544, 111366, 111398,

  90.  111430, 111462, 111494, 112878, 114320, 114988, 115660, 116310, 116950, 117592

  91. };

  92. 

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

  94. 

  95. /**

  96.  * Generate VLC from codeword lengths.

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

  98.  * @param size   length of input data

  99.  * @param vlc    output VLC

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

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

  102.  */

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

  104.                          const int num)

  105. {

  106.     int i;

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

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

  109.     uint8_t bits2[MAX_VLC_SIZE];

  110.     int maxbits = 0, realsize = 0;

  111. 

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

  113.         if(bits[i]){

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

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

  116.             realsize++;

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

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

  119.         }

  120.     }

  121. 

  122.     codes[0] = 0;

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

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

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

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

  127. 

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

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

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

  131.                     bits2, 1, 1,

  132.                     cw,    2, 2,

  133.                     syms,  2, 2, INIT_VLC_USE_NEW_STATIC);

  134. }

  135. 

  136. /**

  137.  * Initialize all tables.

  138.  */

  139. static av_cold void rv34_init_tables(void)

  140. {

  141.     int i, j, k;

  142. 

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

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

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

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

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

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

  149.                 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);

  150.             }

  151.         }

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

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

  154.         }

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

  156.     }

  157. 

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

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

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

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

  162.         }

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

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

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

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

  167.         }

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

  169.     }

  170. }

  171. 

  172. /** @} */ // vlc group

  173. 

  174. /**

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

  176.  * @{

  177.  */

  178. 

  179. /**

  180.  * Decode coded block pattern.

  181.  */

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

  183. {

  184.     int pattern, code, cbp=0;

  185.     int ones;

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

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

  188.     const int *curshift = shifts;

  189.     int i, t, mask;

  190. 

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

  192.     pattern = code & 0xF;

  193.     code >>= 4;

  194. 

  195.     ones = rv34_count_ones[pattern];

  196. 

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

  198.         if(pattern & mask)

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

  200.     }

  201. 

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

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

  204.         if(t == 1)

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

  206.         if(t == 2)

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

  208.     }

  209.     return cbp;

  210. }

  211. 

  212. /**

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

  214.  */

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

  216. {

  217.     if(coef){

  218.         if(coef == esc){

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

  220.             if(coef > 23){

  221.                 coef -= 23;

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

  223.             }

  224.             coef += esc;

  225.         }

  226.         if(get_bits1(gb))

  227.             coef = -coef;

  228.         *dst = coef;

  229.     }

  230. }

  231. 

  232. /**

  233.  * Decode 2x2 subblock of coefficients.

  234.  */

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

  236. {

  237.     int coeffs[4];

  238. 

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

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

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

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

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

  244.     if(is_block2){

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

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

  247.     }else{

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

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

  250.     }

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

  252. }

  253. 

  254. /**

  255.  * Decode coefficients for 4x4 block.

  256.  *

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

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

  259.  *  o--o

  260.  *    /

  261.  *   /

  262.  *  o--o

  263.  */

  264. 

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

  266. {

  267.     int code, pattern;

  268. 

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

  270. 

  271.     pattern = code & 0x7;

  272. 

  273.     code >>= 3;

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

  275. 

  276.     if(pattern & 4){

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

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

  279.     }

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

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

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

  283.     }

  284.     if(pattern & 1){

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

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

  287.     }

  288. 

  289. }

  290. 

  291. /**

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

  293.  * @todo optimize

  294.  */

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

  296. {

  297.     int i;

  298. 

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

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

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

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

  303. }

  304. /** @} */ //block functions

  305. 

  306. 

  307. /**

  308.  * @name RV30/40 bitstream parsing

  309.  * @{

  310.  */

  311. 

  312. /**

  313.  * Decode starting slice position.

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

  315.  */

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

  317. {

  318.     int i;

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

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

  321.             break;

  322.     return rv34_mb_bits_sizes[i];

  323. }

  324. 

  325. /**

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

  327.  */

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

  329. {

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

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

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

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

  334. }

  335. 

  336. /**

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

  338.  */

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

  340. {

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

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

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

  344.     int i, t;

  345. 

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

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

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

  349.             if(!get_bits1(gb))

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

  351.         }

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

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

  354.     }else{

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

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

  357.             return -1;

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

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

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

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

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

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

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

  365.         }

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

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

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

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

  370.             return 0;

  371.         }

  372.         r->chroma_vlc = 1;

  373.         r->luma_vlc   = 0;

  374.     }

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

  376.         if(r->is16){

  377.             t = get_bits(gb, 2);

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

  379.             r->luma_vlc   = 2;

  380.         }else{

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

  382.                 return -1;

  383.             r->luma_vlc   = 1;

  384.         }

  385.         r->chroma_vlc = 0;

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

  387.     }else{

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

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

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

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

  392.             r->is16 = 1;

  393.             r->chroma_vlc = 1;

  394.             r->luma_vlc   = 2;

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

  396.         }

  397.     }

  398. 

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

  400. }

  401. 

  402. /** @} */ //bitstream functions

  403. 

  404. /**

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

  406.  * @{

  407.  */

  408. 

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

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

  411. 

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

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

  414. 

  415. /** availability index for subblocks */

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

  417. 

  418. /**

  419.  * motion vector prediction

  420.  *

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

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

  423.  * some other vectors may be used instead.

  424.  */

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

  426. {

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

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

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

  430.     int i, j;

  431.     int mx, my;

  432.     int avail_index = avail_indexes[subblock_no];

  433.     int c_off = part_sizes_w[block_type];

  434. 

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

  436.     if(subblock_no == 3)

  437.         c_off = -1;

  438. 

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

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

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

  442.     }

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

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

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

  446.     }else{

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

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

  449.     }

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

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

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

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

  454.         }else{

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

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

  457.         }

  458.     }else{

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

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

  461.     }

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

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

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

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

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

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

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

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

  470.         }

  471.     }

  472. }

  473. 

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

  475. 

  476. /**

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

  478.  */

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

  480. {

  481.     int mul = dir ? -r->weight2 : r->weight1;

  482. 

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

  484. }

  485. 

  486. /**

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

  488.  */

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

  490.                                       int A_avail, int B_avail, int C_avail,

  491.                                       int *mx, int *my)

  492. {

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

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

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

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

  497.             *mx /= 2;

  498.             *my /= 2;

  499.         }

  500.     }else{

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

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

  503.     }

  504. }

  505. 

  506. /**

  507.  * motion vector prediction for B-frames

  508.  */

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

  510. {

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

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

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

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

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

  516.     int mx, my;

  517.     int i, j;

  518.     Picture *cur_pic = s->current_picture_ptr;

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

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

  521. 

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

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

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

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

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

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

  528.         has_A = 1;

  529.     }

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

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

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

  533.         has_B = 1;

  534.     }

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

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

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

  538.         has_C = 1;

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

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

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

  542.         has_C = 1;

  543.     }

  544. 

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

  546. 

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

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

  549. 

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

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

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

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

  554.         }

  555.     }

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

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

  558.     }

  559. }

  560. 

  561. /**

  562.  * motion vector prediction - RV3 version

  563.  */

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

  565. {

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

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

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

  569.     int i, j, k;

  570.     int mx, my;

  571.     int avail_index = avail_indexes[0];

  572. 

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

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

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

  576.     }

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

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

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

  580.     }else{

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

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

  583.     }

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

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

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

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

  588.         }else{

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

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

  591.         }

  592.     }else{

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

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

  595.     }

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

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

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

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

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

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

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

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

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

  605.             }

  606.         }

  607.     }

  608. }

  609. 

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

  611. 

  612. /**

  613.  * generic motion compensation function

  614.  *

  615.  * @param r decoder context

  616.  * @param block_type type of the current block

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

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

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

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

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

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

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

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

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

  626.  */

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

  628.                           const int xoff, const int yoff, int mv_off,

  629.                           const int width, const int height, int dir,

  630.                           const int thirdpel, int weighted,

  631.                           qpel_mc_func (*qpel_mc)[16],

  632.                           h264_chroma_mc_func (*chroma_mc))

  633. {

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

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

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

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

  638.     int is16x16 = 1;

  639. 

  640.     if(thirdpel){

  641.         int chroma_mx, chroma_my;

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

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

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

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

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

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

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

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

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

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

  652.     }else{

  653.         int cx, cy;

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

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

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

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

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

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

  660.         umx = cx >> 2;

  661.         umy = cy >> 2;

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

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

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

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

  666.             uvmx = uvmy = 4;

  667.     }

  668.     dxy = ly*4 + lx;

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

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

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

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

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

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

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

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

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

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

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

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

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

  682. 

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

  684.         s->dsp.emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, (width<<3)+6, (height<<3)+6,

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

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

  687.         s->dsp.emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, (width<<2)+1, (height<<2)+1,

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

  689.         s->dsp.emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, (width<<2)+1, (height<<2)+1,

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

  691.         srcU = uvbuf;

  692.         srcV = uvbuf + 16;

  693.     }

  694.     if(!weighted){

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

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

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

  698.     }else{

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

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

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

  702.     }

  703. 

  704.     if(block_type == RV34_MB_P_16x8){

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

  706.         Y    += 8;

  707.         srcY += 8;

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

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

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

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

  712.     }

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

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

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

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

  717. }

  718. 

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

  720.                         const int xoff, const int yoff, int mv_off,

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

  722. {

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

  724.             r->rdsp.put_pixels_tab,

  725.             r->rdsp.put_chroma_pixels_tab);

  726. }

  727. 

  728. static void rv4_weight(RV34DecContext *r)

  729. {

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

  731.                                       r->tmp_b_block_y[0],

  732.                                       r->tmp_b_block_y[1],

  733.                                       r->weight1,

  734.                                       r->weight2,

  735.                                       r->s.linesize);

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

  737.                                       r->tmp_b_block_uv[0],

  738.                                       r->tmp_b_block_uv[2],

  739.                                       r->weight1,

  740.                                       r->weight2,

  741.                                       r->s.uvlinesize);

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

  743.                                       r->tmp_b_block_uv[1],

  744.                                       r->tmp_b_block_uv[3],

  745.                                       r->weight1,

  746.                                       r->weight2,

  747.                                       r->s.uvlinesize);

  748. }

  749. 

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

  751. {

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

  753. 

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

  755.             r->rdsp.put_pixels_tab,

  756.             r->rdsp.put_chroma_pixels_tab);

  757.     if(!weighted){

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

  759.                 r->rdsp.avg_pixels_tab,

  760.                 r->rdsp.avg_chroma_pixels_tab);

  761.     }else{

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

  763.                 r->rdsp.put_pixels_tab,

  764.                 r->rdsp.put_chroma_pixels_tab);

  765.         rv4_weight(r);

  766.     }

  767. }

  768. 

  769. static void rv34_mc_2mv_skip(RV34DecContext *r)

  770. {

  771.     int i, j;

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

  773. 

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

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

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

  777.                      weighted,

  778.                      r->rdsp.put_pixels_tab,

  779.                      r->rdsp.put_chroma_pixels_tab);

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

  781.                      weighted,

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

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

  784.         }

  785.     if(weighted)

  786.         rv4_weight(r);

  787. }

  788. 

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

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

  791. 

  792. /**

  793.  * Decode motion vector differences

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

  795.  */

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

  797. {

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

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

  800.     int i, j, k, l;

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

  802.     int next_bt;

  803. 

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

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

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

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

  808.     }

  809.     switch(block_type){

  810.     case RV34_MB_TYPE_INTRA:

  811.     case RV34_MB_TYPE_INTRA16x16:

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

  813.         return 0;

  814.     case RV34_MB_SKIP:

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

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

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

  818.             break;

  819.         }

  820.     case RV34_MB_B_DIRECT:

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

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

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

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

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

  826.         }else

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

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

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

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

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

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

  833.             rv34_mc_2mv(r, block_type);

  834.         else

  835.             rv34_mc_2mv_skip(r);

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

  837.         break;

  838.     case RV34_MB_P_16x16:

  839.     case RV34_MB_P_MIX16x16:

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

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

  842.         break;

  843.     case RV34_MB_B_FORWARD:

  844.     case RV34_MB_B_BACKWARD:

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

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

  847.         if(r->rv30)

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

  849.         else

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

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

  852.         break;

  853.     case RV34_MB_P_16x8:

  854.     case RV34_MB_P_8x16:

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

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

  857.         if(block_type == RV34_MB_P_16x8){

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

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

  860.         }

  861.         if(block_type == RV34_MB_P_8x16){

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

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

  864.         }

  865.         break;

  866.     case RV34_MB_B_BIDIR:

  867.         rv34_pred_mv_b  (r, block_type, 0);

  868.         rv34_pred_mv_b  (r, block_type, 1);

  869.         rv34_mc_2mv     (r, block_type);

  870.         break;

  871.     case RV34_MB_P_8x8:

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

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

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

  875.         }

  876.         break;

  877.     }

  878. 

  879.     return 0;

  880. }

  881. /** @} */ // mv group

  882. 

  883. /**

  884.  * @name Macroblock reconstruction functions

  885.  * @{

  886.  */

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

  888. static const int ittrans[9] = {

  889.  DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,

  890.  VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,

  891. };

  892. 

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

  894. static const int ittrans16[4] = {

  895.  DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,

  896. };

  897. 

  898. /**

  899.  * Perform 4x4 intra prediction.

  900.  */

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

  902. {

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

  904.     uint32_t topleft;

  905. 

  906.     if(!up && !left)

  907.         itype = DC_128_PRED;

  908.     else if(!up){

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

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

  911.     }else if(!left){

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

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

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

  915.     }

  916.     if(!down){

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

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

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

  920.     }

  921.     if(!right && up){

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

  923.         prev = (uint8_t*)&topleft;

  924.     }

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

  926. }

  927. 

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

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

  930. {

  931.     int x, y;

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

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

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

  935. }

  936. 

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

  938. {

  939.     if(!up && !left)

  940.         itype = DC_128_PRED8x8;

  941.     else if(!up){

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

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

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

  945.     }else if(!left){

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

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

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

  949.     }

  950.     return itype;

  951. }

  952. 

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

  954. {

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

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

  957.     int i, j;

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

  959.     int itype;

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

  961.     int idx;

  962. 

  963.     // Set neighbour information.

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

  965.         avail[0] = 1;

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

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

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

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

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

  971.         avail[5] = 1;

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

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

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

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

  976. 

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

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

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

  980.     if(!is16){

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

  982.             idx = 9 + j*8;

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

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

  985.                 avail[idx] = 1;

  986.                 if(cbp & 1)

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

  988.             }

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

  990.             intra_types += r->intra_types_stride;

  991.         }

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

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

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

  995.             idx = 6 + j*4;

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

  997.                 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]);

  998.                 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]);

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

  1000.                 if(cbp & 0x01)

  1001.                     rv34_add_4x4_block(U + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[4], i*4+j*32);

  1002.                 if(cbp & 0x10)

  1003.                     rv34_add_4x4_block(V + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[5], i*4+j*32);

  1004.             }

  1005.         }

  1006.     }else{

  1007.         itype = ittrans16[intra_types[0]];

  1008.         itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);

  1009.         r->h.pred16x16[itype](Y, s->linesize);

  1010.         dsp->add_pixels_clamped(s->block[0], Y,     s->linesize);

  1011.         dsp->add_pixels_clamped(s->block[1], Y + 8, s->linesize);

  1012.         Y += s->linesize * 8;

  1013.         dsp->add_pixels_clamped(s->block[2], Y,     s->linesize);

  1014.         dsp->add_pixels_clamped(s->block[3], Y + 8, s->linesize);

  1015. 

  1016.         itype = ittrans16[intra_types[0]];

  1017.         if(itype == PLANE_PRED8x8) itype = DC_PRED8x8;

  1018.         itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);

  1019.         r->h.pred8x8[itype](U, s->uvlinesize);

  1020.         dsp->add_pixels_clamped(s->block[4], U, s->uvlinesize);

  1021.         r->h.pred8x8[itype](V, s->uvlinesize);

  1022.         dsp->add_pixels_clamped(s->block[5], V, s->uvlinesize);

  1023.     }

  1024. }

  1025. 

  1026. /**

  1027.  * mask for retrieving all bits in coded block pattern

  1028.  * corresponding to one 8x8 block

  1029.  */

  1030. #define LUMA_CBP_BLOCK_MASK 0x33

  1031. 

  1032. #define U_CBP_MASK 0x0F0000

  1033. #define V_CBP_MASK 0xF00000

  1034. 

  1035. /** @} */ // recons group

  1036. 

  1037. 

  1038. static void rv34_apply_differences(RV34DecContext *r, int cbp)

  1039. {

  1040.     static const int shifts[4] = { 0, 2, 8, 10 };

  1041.     MpegEncContext *s = &r->s;

  1042.     int i;

  1043. 

  1044.     for(i = 0; i < 4; i++)

  1045.         if((cbp & (LUMA_CBP_BLOCK_MASK << shifts[i])) || r->block_type == RV34_MB_P_MIX16x16)

  1046.             s->dsp.add_pixels_clamped(s->block[i], s->dest[0] + (i & 1)*8 + (i&2)*4*s->linesize, s->linesize);

  1047.     if(cbp & U_CBP_MASK)

  1048.         s->dsp.add_pixels_clamped(s->block[4], s->dest[1], s->uvlinesize);

  1049.     if(cbp & V_CBP_MASK)

  1050.         s->dsp.add_pixels_clamped(s->block[5], s->dest[2], s->uvlinesize);

  1051. }

  1052. 

  1053. static int is_mv_diff_gt_3(int16_t (*motion_val)[2], int step)

  1054. {

  1055.     int d;

  1056.     d = motion_val[0][0] - motion_val[-step][0];

  1057.     if(d < -3 || d > 3)

  1058.         return 1;

  1059.     d = motion_val[0][1] - motion_val[-step][1];

  1060.     if(d < -3 || d > 3)

  1061.         return 1;

  1062.     return 0;

  1063. }

  1064. 

  1065. static int rv34_set_deblock_coef(RV34DecContext *r)

  1066. {

  1067.     MpegEncContext *s = &r->s;

  1068.     int hmvmask = 0, vmvmask = 0, i, j;

  1069.     int midx = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;

  1070.     int16_t (*motion_val)[2] = &s->current_picture_ptr->f.motion_val[0][midx];

  1071.     for(j = 0; j < 16; j += 8){

  1072.         for(i = 0; i < 2; i++){

  1073.             if(is_mv_diff_gt_3(motion_val + i, 1))

  1074.                 vmvmask |= 0x11 << (j + i*2);

  1075.             if((j || s->mb_y) && is_mv_diff_gt_3(motion_val + i, s->b8_stride))

  1076.                 hmvmask |= 0x03 << (j + i*2);

  1077.         }

  1078.         motion_val += s->b8_stride;

  1079.     }

  1080.     if(s->first_slice_line)

  1081.         hmvmask &= ~0x000F;

  1082.     if(!s->mb_x)

  1083.         vmvmask &= ~0x1111;

  1084.     if(r->rv30){ //RV30 marks both subblocks on the edge for filtering

  1085.         vmvmask |= (vmvmask & 0x4444) >> 1;

  1086.         hmvmask |= (hmvmask & 0x0F00) >> 4;

  1087.         if(s->mb_x)

  1088.             r->deblock_coefs[s->mb_x - 1 + s->mb_y*s->mb_stride] |= (vmvmask & 0x1111) << 3;

  1089.         if(!s->first_slice_line)

  1090.             r->deblock_coefs[s->mb_x + (s->mb_y - 1)*s->mb_stride] |= (hmvmask & 0xF) << 12;

  1091.     }

  1092.     return hmvmask | vmvmask;

  1093. }

  1094. 

  1095. static int rv34_decode_macroblock(RV34DecContext *r, int8_t *intra_types)

  1096. {

  1097.     MpegEncContext *s = &r->s;

  1098.     GetBitContext *gb = &s->gb;

  1099.     int cbp, cbp2;

  1100.     int i, blknum, blkoff;

  1101.     LOCAL_ALIGNED_16(DCTELEM, block16, [64]);

  1102.     int luma_dc_quant;

  1103.     int dist;

  1104.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1105. 

  1106.     // Calculate which neighbours are available. Maybe it's worth optimizing too.

  1107.     memset(r->avail_cache, 0, sizeof(r->avail_cache));

  1108.     fill_rectangle(r->avail_cache + 6, 2, 2, 4, 1, 4);

  1109.     dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;

  1110.     if(s->mb_x && dist)

  1111.         r->avail_cache[5] =

  1112.         r->avail_cache[9] = s->current_picture_ptr->f.mb_type[mb_pos - 1];

  1113.     if(dist >= s->mb_width)

  1114.         r->avail_cache[2] =

  1115.         r->avail_cache[3] = s->current_picture_ptr->f.mb_type[mb_pos - s->mb_stride];

  1116.     if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)

  1117.         r->avail_cache[4] = s->current_picture_ptr->f.mb_type[mb_pos - s->mb_stride + 1];

  1118.     if(s->mb_x && dist > s->mb_width)

  1119.         r->avail_cache[1] = s->current_picture_ptr->f.mb_type[mb_pos - s->mb_stride - 1];

  1120. 

  1121.     s->qscale = r->si.quant;

  1122.     cbp = cbp2 = rv34_decode_mb_header(r, intra_types);

  1123.     r->cbp_luma  [mb_pos] = cbp;

  1124.     r->cbp_chroma[mb_pos] = cbp >> 16;

  1125.     if(s->pict_type == AV_PICTURE_TYPE_I)

  1126.         r->deblock_coefs[mb_pos] = 0xFFFF;

  1127.     else

  1128.         r->deblock_coefs[mb_pos] = rv34_set_deblock_coef(r) | r->cbp_luma[mb_pos];

  1129.     s->current_picture_ptr->f.qscale_table[mb_pos] = s->qscale;

  1130. 

  1131.     if(cbp == -1)

  1132.         return -1;

  1133. 

  1134.     luma_dc_quant = r->block_type == RV34_MB_P_MIX16x16 ? r->luma_dc_quant_p[s->qscale] : r->luma_dc_quant_i[s->qscale];

  1135.     if(r->is16){

  1136.         memset(block16, 0, 64 * sizeof(*block16));

  1137.         rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0);

  1138.         rv34_dequant4x4_16x16(block16, rv34_qscale_tab[luma_dc_quant],rv34_qscale_tab[s->qscale]);

  1139.         r->rdsp.rv34_inv_transform_tab[1](block16);

  1140.     }

  1141. 

  1142.     for(i = 0; i < 16; i++, cbp >>= 1){

  1143.         if(!r->is16 && !(cbp & 1)) continue;

  1144.         blknum = ((i & 2) >> 1) + ((i & 8) >> 2);

  1145.         blkoff = ((i & 1) << 2) + ((i & 4) << 3);

  1146.         if(cbp & 1)

  1147.             rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->luma_vlc, 0);

  1148.         r->rdsp.rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[s->qscale],rv34_qscale_tab[s->qscale]);

  1149.         if(r->is16) //FIXME: optimize

  1150.             s->block[blknum][blkoff] = block16[(i & 3) | ((i & 0xC) << 1)];

  1151.         r->rdsp.rv34_inv_transform_tab[0](s->block[blknum] + blkoff);

  1152.     }

  1153.     if(r->block_type == RV34_MB_P_MIX16x16)

  1154.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1155.     for(; i < 24; i++, cbp >>= 1){

  1156.         if(!(cbp & 1)) continue;

  1157.         blknum = ((i & 4) >> 2) + 4;

  1158.         blkoff = ((i & 1) << 2) + ((i & 2) << 4);

  1159.         rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->chroma_vlc, 1);

  1160.         r->rdsp.rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]],rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]]);

  1161.         r->rdsp.rv34_inv_transform_tab[0](s->block[blknum] + blkoff);

  1162.     }

  1163.     if (IS_INTRA(s->current_picture_ptr->f.mb_type[mb_pos]))

  1164.         rv34_output_macroblock(r, intra_types, cbp2, r->is16);

  1165.     else

  1166.         rv34_apply_differences(r, cbp2);

  1167. 

  1168.     return 0;

  1169. }

  1170. 

  1171. static int check_slice_end(RV34DecContext *r, MpegEncContext *s)

  1172. {

  1173.     int bits;

  1174.     if(s->mb_y >= s->mb_height)

  1175.         return 1;

  1176.     if(!s->mb_num_left)

  1177.         return 1;

  1178.     if(r->s.mb_skip_run > 1)

  1179.         return 0;

  1180.     bits = r->bits - get_bits_count(&s->gb);

  1181.     if(bits < 0 || (bits < 8 && !show_bits(&s->gb, bits)))

  1182.         return 1;

  1183.     return 0;

  1184. }

  1185. 

  1186. static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int buf_size)

  1187. {

  1188.     MpegEncContext *s = &r->s;

  1189.     GetBitContext *gb = &s->gb;

  1190.     int mb_pos;

  1191.     int res;

  1192. 

  1193.     init_get_bits(&r->s.gb, buf, buf_size*8);

  1194.     res = r->parse_slice_header(r, gb, &r->si);

  1195.     if(res < 0){

  1196.         av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");

  1197.         return -1;

  1198.     }

  1199. 

  1200.     if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr==NULL) {

  1201.         if(s->width != r->si.width || s->height != r->si.height){

  1202.             av_log(s->avctx, AV_LOG_DEBUG, "Changing dimensions to %dx%d\n", r->si.width,r->si.height);

  1203.             MPV_common_end(s);

  1204.             s->width  = r->si.width;

  1205.             s->height = r->si.height;

  1206.             avcodec_set_dimensions(s->avctx, s->width, s->height);

  1207.             if(MPV_common_init(s) < 0)

  1208.                 return -1;

  1209.             r->intra_types_stride = s->mb_width*4 + 4;

  1210.             r->intra_types_hist = av_realloc(r->intra_types_hist, r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1211.             r->intra_types = r->intra_types_hist + r->intra_types_stride * 4;

  1212.             r->mb_type = av_realloc(r->mb_type, r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));

  1213.             r->cbp_luma   = av_realloc(r->cbp_luma,   r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));

  1214.             r->cbp_chroma = av_realloc(r->cbp_chroma, r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));

  1215.             r->deblock_coefs = av_realloc(r->deblock_coefs, r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));

  1216.             av_freep(&r->tmp_b_block_base);

  1217.         }

  1218.         s->pict_type = r->si.type ? r->si.type : AV_PICTURE_TYPE_I;

  1219.         if(MPV_frame_start(s, s->avctx) < 0)

  1220.             return -1;

  1221.         ff_er_frame_start(s);

  1222.         if (!r->tmp_b_block_base) {

  1223.             int i;

  1224. 

  1225.             r->tmp_b_block_base = av_malloc(s->linesize * 48);

  1226.             for (i = 0; i < 2; i++)

  1227.                 r->tmp_b_block_y[i] = r->tmp_b_block_base + i * 16 * s->linesize;

  1228.             for (i = 0; i < 4; i++)

  1229.                 r->tmp_b_block_uv[i] = r->tmp_b_block_base + 32 * s->linesize

  1230.                                        + (i >> 1) * 8 * s->uvlinesize + (i & 1) * 16;

  1231.         }

  1232.         r->cur_pts = r->si.pts;

  1233.         if(s->pict_type != AV_PICTURE_TYPE_B){

  1234.             r->last_pts = r->next_pts;

  1235.             r->next_pts = r->cur_pts;

  1236.         }else{

  1237.             int refdist = GET_PTS_DIFF(r->next_pts, r->last_pts);

  1238.             int dist0   = GET_PTS_DIFF(r->cur_pts,  r->last_pts);

  1239.             int dist1   = GET_PTS_DIFF(r->next_pts, r->cur_pts);

  1240. 

  1241.             if(!refdist){

  1242.                 r->weight1 = r->weight2 = 8192;

  1243.             }else{

  1244.                 r->weight1 = (dist0 << 14) / refdist;

  1245.                 r->weight2 = (dist1 << 14) / refdist;

  1246.             }

  1247.         }

  1248.         s->mb_x = s->mb_y = 0;

  1249.     } else {

  1250.         int slice_type = r->si.type ? r->si.type : AV_PICTURE_TYPE_I;

  1251. 

  1252.         if (slice_type != s->pict_type) {

  1253.             av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");

  1254.             return AVERROR_INVALIDDATA;

  1255.         }

  1256.         if (s->width != r->si.width || s->height != r->si.height) {

  1257.             av_log(s->avctx, AV_LOG_ERROR, "Size mismatch\n");

  1258.             return AVERROR_INVALIDDATA;

  1259.         }

  1260.     }

  1261. 

  1262.     r->si.end = end;

  1263.     s->qscale = r->si.quant;

  1264.     r->bits = buf_size*8;

  1265.     s->mb_num_left = r->si.end - r->si.start;

  1266.     r->s.mb_skip_run = 0;

  1267. 

  1268.     mb_pos = s->mb_x + s->mb_y * s->mb_width;

  1269.     if(r->si.start != mb_pos){

  1270.         av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);

  1271.         s->mb_x = r->si.start % s->mb_width;

  1272.         s->mb_y = r->si.start / s->mb_width;

  1273.     }

  1274.     memset(r->intra_types_hist, -1, r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1275.     s->first_slice_line = 1;

  1276.     s->resync_mb_x = s->mb_x;

  1277.     s->resync_mb_y = s->mb_y;

  1278. 

  1279.     ff_init_block_index(s);

  1280.     while(!check_slice_end(r, s)) {

  1281.         ff_update_block_index(s);

  1282.         s->dsp.clear_blocks(s->block[0]);

  1283. 

  1284.         if(rv34_decode_macroblock(r, r->intra_types + s->mb_x * 4 + 4) < 0){

  1285.             ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_ERROR);

  1286.             return -1;

  1287.         }

  1288.         if (++s->mb_x == s->mb_width) {

  1289.             s->mb_x = 0;

  1290.             s->mb_y++;

  1291.             ff_init_block_index(s);

  1292. 

  1293.             memmove(r->intra_types_hist, r->intra_types, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));

  1294.             memset(r->intra_types, -1, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));

  1295. 

  1296.             if(r->loop_filter && s->mb_y >= 2)

  1297.                 r->loop_filter(r, s->mb_y - 2);

  1298.         }

  1299.         if(s->mb_x == s->resync_mb_x)

  1300.             s->first_slice_line=0;

  1301.         s->mb_num_left--;

  1302.     }

  1303.     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);

  1304. 

  1305.     return s->mb_y == s->mb_height;

  1306. }

  1307. 

  1308. /** @} */ // recons group end

  1309. 

  1310. /**

  1311.  * Initialize decoder.

  1312.  */

  1313. av_cold int ff_rv34_decode_init(AVCodecContext *avctx)

  1314. {

  1315.     RV34DecContext *r = avctx->priv_data;

  1316.     MpegEncContext *s = &r->s;

  1317. 

  1318.     MPV_decode_defaults(s);

  1319.     s->avctx      = avctx;

  1320.     s->out_format = FMT_H263;

  1321.     s->codec_id   = avctx->codec_id;

  1322. 

  1323.     s->width  = avctx->width;

  1324.     s->height = avctx->height;

  1325. 

  1326.     r->s.avctx = avctx;

  1327.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  1328.     r->s.flags |= CODEC_FLAG_EMU_EDGE;

  1329.     avctx->pix_fmt = PIX_FMT_YUV420P;

  1330.     avctx->has_b_frames = 1;

  1331.     s->low_delay = 0;

  1332. 

  1333.     if (MPV_common_init(s) < 0)

  1334.         return -1;

  1335. 

  1336.     ff_h264_pred_init(&r->h, CODEC_ID_RV40, 8, 1);

  1337. 

  1338. #if CONFIG_RV30_DECODER

  1339.     if (avctx->codec_id == CODEC_ID_RV30)

  1340.         ff_rv30dsp_init(&r->rdsp, &r->s.dsp);

  1341. #endif

  1342. #if CONFIG_RV40_DECODER

  1343.     if (avctx->codec_id == CODEC_ID_RV40)

  1344.         ff_rv40dsp_init(&r->rdsp, &r->s.dsp);

  1345. #endif

  1346. 

  1347.     r->intra_types_stride = 4*s->mb_stride + 4;

  1348.     r->intra_types_hist = av_malloc(r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1349.     r->intra_types = r->intra_types_hist + r->intra_types_stride * 4;

  1350. 

  1351.     r->mb_type = av_mallocz(r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));

  1352. 

  1353.     r->cbp_luma   = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));

  1354.     r->cbp_chroma = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));

  1355.     r->deblock_coefs = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));

  1356. 

  1357.     if(!intra_vlcs[0].cbppattern[0].bits)

  1358.         rv34_init_tables();

  1359. 

  1360.     return 0;

  1361. }

  1362. 

  1363. static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)

  1364. {

  1365.     if(avctx->slice_count) return avctx->slice_offset[n];

  1366.     else                   return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) :  AV_RB32(buf + n*8);

  1367. }

  1368. 

  1369. int ff_rv34_decode_frame(AVCodecContext *avctx,

  1370.                             void *data, int *data_size,

  1371.                             AVPacket *avpkt)

  1372. {

  1373.     const uint8_t *buf = avpkt->data;

  1374.     int buf_size = avpkt->size;

  1375.     RV34DecContext *r = avctx->priv_data;

  1376.     MpegEncContext *s = &r->s;

  1377.     AVFrame *pict = data;

  1378.     SliceInfo si;

  1379.     int i;

  1380.     int slice_count;

  1381.     const uint8_t *slices_hdr = NULL;

  1382.     int last = 0;

  1383. 

  1384.     /* no supplementary picture */

  1385.     if (buf_size == 0) {

  1386.         /* special case for last picture */

  1387.         if (s->low_delay==0 && s->next_picture_ptr) {

  1388.             *pict = *(AVFrame*)s->next_picture_ptr;

  1389.             s->next_picture_ptr = NULL;

  1390. 

  1391.             *data_size = sizeof(AVFrame);

  1392.         }

  1393.         return 0;

  1394.     }

  1395. 

  1396.     if(!avctx->slice_count){

  1397.         slice_count = (*buf++) + 1;

  1398.         slices_hdr = buf + 4;

  1399.         buf += 8 * slice_count;

  1400.         buf_size -= 1 + 8 * slice_count;

  1401.     }else

  1402.         slice_count = avctx->slice_count;

  1403. 

  1404.     //parse first slice header to check whether this frame can be decoded

  1405.     if(get_slice_offset(avctx, slices_hdr, 0) < 0 ||

  1406.        get_slice_offset(avctx, slices_hdr, 0) > buf_size){

  1407.         av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");

  1408.         return -1;

  1409.     }

  1410.     init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), (buf_size-get_slice_offset(avctx, slices_hdr, 0))*8);

  1411.     if(r->parse_slice_header(r, &r->s.gb, &si) < 0 || si.start){

  1412.         av_log(avctx, AV_LOG_ERROR, "First slice header is incorrect\n");

  1413.         return -1;

  1414.     }

  1415.     if ((!s->last_picture_ptr || !s->last_picture_ptr->f.data[0]) && si.type == AV_PICTURE_TYPE_B)

  1416.         return -1;

  1417.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && si.type==AV_PICTURE_TYPE_B)

  1418.        || (avctx->skip_frame >= AVDISCARD_NONKEY && si.type!=AV_PICTURE_TYPE_I)

  1419.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  1420.         return avpkt->size;

  1421. 

  1422.     for(i = 0; i < slice_count; i++){

  1423.         int offset = get_slice_offset(avctx, slices_hdr, i);

  1424.         int size;

  1425.         if(i+1 == slice_count)

  1426.             size = buf_size - offset;

  1427.         else

  1428.             size = get_slice_offset(avctx, slices_hdr, i+1) - offset;

  1429. 

  1430.         if(offset < 0 || offset > buf_size){

  1431.             av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");

  1432.             break;

  1433.         }

  1434. 

  1435.         r->si.end = s->mb_width * s->mb_height;

  1436.         if(i+1 < slice_count){

  1437.             if (get_slice_offset(avctx, slices_hdr, i+1) < 0 ||

  1438.                 get_slice_offset(avctx, slices_hdr, i+1) > buf_size) {

  1439.                 av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");

  1440.                 break;

  1441.             }

  1442.             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);

  1443.             if(r->parse_slice_header(r, &r->s.gb, &si) < 0){

  1444.                 if(i+2 < slice_count)

  1445.                     size = get_slice_offset(avctx, slices_hdr, i+2) - offset;

  1446.                 else

  1447.                     size = buf_size - offset;

  1448.             }else

  1449.                 r->si.end = si.start;

  1450.         }

  1451.         if (size < 0 || size > buf_size - offset) {

  1452.             av_log(avctx, AV_LOG_ERROR, "Slice size is invalid\n");

  1453.             break;

  1454.         }

  1455.         last = rv34_decode_slice(r, r->si.end, buf + offset, size);

  1456.         s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;

  1457.         if(last)

  1458.             break;

  1459.     }

  1460. 

  1461.     if(last && s->current_picture_ptr){

  1462.         if(r->loop_filter)

  1463.             r->loop_filter(r, s->mb_height - 1);

  1464.         ff_er_frame_end(s);

  1465.         MPV_frame_end(s);

  1466.         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  1467.             *pict = *(AVFrame*)s->current_picture_ptr;

  1468.         } else if (s->last_picture_ptr != NULL) {

  1469.             *pict = *(AVFrame*)s->last_picture_ptr;

  1470.         }

  1471. 

  1472.         if(s->last_picture_ptr || s->low_delay){

  1473.             *data_size = sizeof(AVFrame);

  1474.             ff_print_debug_info(s, pict);

  1475.         }

  1476.         s->current_picture_ptr = NULL; //so we can detect if frame_end wasnt called (find some nicer solution...)

  1477.     }

  1478.     return avpkt->size;

  1479. }

  1480. 

  1481. av_cold int ff_rv34_decode_end(AVCodecContext *avctx)

  1482. {

  1483.     RV34DecContext *r = avctx->priv_data;

  1484. 

  1485.     MPV_common_end(&r->s);

  1486. 

  1487.     av_freep(&r->intra_types_hist);

  1488.     r->intra_types = NULL;

  1489.     av_freep(&r->tmp_b_block_base);

  1490.     av_freep(&r->mb_type);

  1491.     av_freep(&r->cbp_luma);

  1492.     av_freep(&r->cbp_chroma);

  1493.     av_freep(&r->deblock_coefs);

  1494. 

  1495.     return 0;

  1496. }