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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 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. /**

  65.  * Generate VLC from codeword lengths.

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

  67.  * @param size   length of input data

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

  69.  */

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

  71. {

  72.     int i;

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

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

  75.     uint8_t bits2[size];

  76.     int maxbits = 0, realsize = 0;

  77. 

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

  79.         if(bits[i]){

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

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

  82.             realsize++;

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

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

  85.         }

  86.     }

  87. 

  88.     codes[0] = 0;

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

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

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

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

  93. 

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

  95.                     bits2, 1, 1,

  96.                     cw,    2, 2,

  97.                     syms,  2, 2, INIT_VLC_USE_STATIC);

  98. }

  99. 

  100. /**

  101.  * Initialize all tables.

  102.  */

  103. static av_cold void rv34_init_tables()

  104. {

  105.     int i, j, k;

  106. 

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

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

  109.             rv34_gen_vlc(rv34_table_intra_cbppat   [i][j], CBPPAT_VLC_SIZE,   &intra_vlcs[i].cbppattern[j],     NULL);

  110.             rv34_gen_vlc(rv34_table_intra_secondpat[i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].second_pattern[j], NULL);

  111.             rv34_gen_vlc(rv34_table_intra_thirdpat [i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].third_pattern[j],  NULL);

  112.             for(k = 0; k < 4; k++)

  113.                 rv34_gen_vlc(rv34_table_intra_cbp[i][j+k*2],  CBP_VLC_SIZE,   &intra_vlcs[i].cbp[j][k],         rv34_cbp_code);

  114.         }

  115.         for(j = 0; j < 4; j++)

  116.             rv34_gen_vlc(rv34_table_intra_firstpat[i][j], FIRSTBLK_VLC_SIZE, &intra_vlcs[i].first_pattern[j], NULL);

  117.         rv34_gen_vlc(rv34_intra_coeff[i], COEFF_VLC_SIZE, &intra_vlcs[i].coefficient, NULL);

  118.     }

  119. 

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

  121.         rv34_gen_vlc(rv34_inter_cbppat[i], CBPPAT_VLC_SIZE, &inter_vlcs[i].cbppattern[0], NULL);

  122.         for(j = 0; j < 4; j++)

  123.             rv34_gen_vlc(rv34_inter_cbp[i][j], CBP_VLC_SIZE, &inter_vlcs[i].cbp[0][j], rv34_cbp_code);

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

  125.             rv34_gen_vlc(rv34_table_inter_firstpat [i][j], FIRSTBLK_VLC_SIZE, &inter_vlcs[i].first_pattern[j],  NULL);

  126.             rv34_gen_vlc(rv34_table_inter_secondpat[i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].second_pattern[j], NULL);

  127.             rv34_gen_vlc(rv34_table_inter_thirdpat [i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].third_pattern[j],  NULL);

  128.         }

  129.         rv34_gen_vlc(rv34_inter_coeff[i], COEFF_VLC_SIZE, &inter_vlcs[i].coefficient, NULL);

  130.     }

  131. }

  132. 

  133. /** @} */ // vlc group

  134. 

  135. 

  136. /**

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

  138.  * @{

  139.  */

  140. 

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

  142. {

  143.     int i;

  144. 

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

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

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

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

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

  150. 

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

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

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

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

  155.     }

  156. }

  157. 

  158. /**

  159.  * Real Video 3.0/4.0 inverse transform

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

  161.  */

  162. static void rv34_inv_transform(DCTELEM *block){

  163.     int temp[16];

  164.     int i;

  165. 

  166.     rv34_row_transform(temp, block);

  167. 

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

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

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

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

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

  173. 

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

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

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

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

  178.     }

  179. 

  180. }

  181. 

  182. /**

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

  184.  *

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

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

  187.  */

  188. static void rv34_inv_transform_noround(DCTELEM *block){

  189.     int temp[16];

  190.     int i;

  191. 

  192.     rv34_row_transform(temp, block);

  193. 

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

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

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

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

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

  199. 

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

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

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

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

  204.     }

  205. 

  206. }

  207. 

  208. /** @} */ // transform

  209. 

  210. 

  211. /**

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

  213.  * @{

  214.  */

  215. 

  216. /**

  217.  * Decode coded block pattern.

  218.  */

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

  220. {

  221.     int pattern, code, cbp=0;

  222.     int ones;

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

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

  225.     int *curshift = shifts;

  226.     int i, t, mask;

  227. 

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

  229.     pattern = code & 0xF;

  230.     code >>= 4;

  231. 

  232.     ones = rv34_count_ones[pattern];

  233. 

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

  235.         if(pattern & mask)

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

  237.     }

  238. 

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

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

  241.         if(t == 1)

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

  243.         if(t == 2)

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

  245.     }

  246.     return cbp;

  247. }

  248. 

  249. /**

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

  251.  */

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

  253. {

  254.     if(coef){

  255.         if(coef == esc){

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

  257.             if(coef > 23){

  258.                 coef -= 23;

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

  260.             }

  261.             coef += esc;

  262.         }

  263.         if(get_bits1(gb))

  264.             coef = -coef;

  265.         *dst = coef;

  266.     }

  267. }

  268. 

  269. /**

  270.  * Decode 2x2 subblock of coefficients.

  271.  */

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

  273. {

  274.     int coeffs[4];

  275. 

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

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

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

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

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

  281.     if(is_block2){

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

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

  284.     }else{

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

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

  287.     }

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

  289. }

  290. 

  291. /**

  292.  * Decode coefficients for 4x4 block.

  293.  *

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

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

  296.  *  o--o

  297.  *    /

  298.  *   /

  299.  *  o--o

  300.  */

  301. 

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

  303. {

  304.     int code, pattern;

  305. 

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

  307. 

  308.     pattern = code & 0x7;

  309. 

  310.     code >>= 3;

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

  312. 

  313.     if(pattern & 4){

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

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

  316.     }

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

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

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

  320.     }

  321.     if(pattern & 1){

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

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

  324.     }

  325. 

  326. }

  327. 

  328. /**

  329.  * Dequantize ordinary 4x4 block.

  330.  * @todo optimize

  331.  */

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

  333. {

  334.     int i, j;

  335. 

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

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

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

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

  340. }

  341. 

  342. /**

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

  344.  * @todo optimize

  345.  */

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

  347. {

  348.     int i;

  349. 

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

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

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

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

  354. }

  355. /** @} */ //block functions

  356. 

  357. 

  358. /**

  359.  * @defgroup bitstream RV30/40 bitstream parsing

  360.  * @{

  361.  */

  362. 

  363. /**

  364.  * Decode starting slice position.

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

  366.  */

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

  368. {

  369.     int i;

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

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

  372.             break;

  373.     return rv34_mb_bits_sizes[i];

  374. }

  375. 

  376. /**

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

  378.  */

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

  380. {

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

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

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

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

  385. }

  386. 

  387. /**

  388.  * Decode quantizer difference and return modified quantizer.

  389.  */

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

  391. {

  392.     if(get_bits1(gb))

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

  394.     else

  395.         return get_bits(gb, 5);

  396. }

  397. 

  398. /** @} */ //bitstream functions

  399. 

  400. /**

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

  402.  * @{

  403.  */

  404. 

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

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

  407. 

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

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

  410. 

  411. /** availability index for subblocks */

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

  413. 

  414. /**

  415.  * motion vector prediction

  416.  *

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

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

  419.  * some other vectors may be used instead.

  420.  */

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

  422. {

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

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

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

  426.     int i, j;

  427.     int mx, my;

  428.     int avail_index = avail_indexes[subblock_no];

  429.     int c_off = part_sizes_w[block_type];

  430. 

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

  432.     if(subblock_no == 3)

  433.         c_off = -1;

  434. 

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

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

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

  438.     }

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

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

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

  442.     }else{

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

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

  445.     }

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

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

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

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

  450.         }else{

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

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

  453.         }

  454.     }else{

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

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

  457.     }

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

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

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

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

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

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

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

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

  466.         }

  467.     }

  468. }

  469. 

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

  471. 

  472. /**

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

  474.  */

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

  476. {

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

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

  479.     int mul;

  480. 

  481.     if(!refdist) return 0;

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

  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->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[5-1] & type) & mask){

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

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

  528.         has_A = 1;

  529.     }

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

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

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

  533.         has_B = 1;

  534.     }

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

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

  537.         C[1] = cur_pic->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[5-5] & type) & mask){

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

  541.         C[1] = cur_pic->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->motion_val[dir][mv_pos + i + j*s->b8_stride][0] = mx;

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

  558. }

  559. 

  560. /**

  561.  * motion vector prediction - RV3 version

  562.  */

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

  564. {

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

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

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

  568.     int i, j, k;

  569.     int mx, my;

  570.     int avail_index = avail_indexes[0];

  571. 

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

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

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

  575.     }

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

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

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

  579.     }else{

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

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

  582.     }

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

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

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

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

  587.         }else{

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

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

  590.         }

  591.     }else{

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

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

  594.     }

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

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

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

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

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

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

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

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

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

  604.             }

  605.         }

  606.     }

  607. }

  608. 

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

  610. 

  611. /**

  612.  * generic motion compensation function

  613.  *

  614.  * @param r decoder context

  615.  * @param block_type type of the current block

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

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

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

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

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

  621.  */

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

  623.                           const int xoff, const int yoff, int mv_off,

  624.                           const int width, const int height, int dir,

  625.                           const int thirdpel,

  626.                           qpel_mc_func (*qpel_mc)[16],

  627.                           h264_chroma_mc_func (*chroma_mc))

  628. {

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

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

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

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

  633.     int is16x16 = 1;

  634. 

  635.     if(thirdpel){

  636.         int chroma_mx, chroma_my;

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

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

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

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

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

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

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

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

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

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

  647.     }else{

  648.         int cx, cy;

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

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

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

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

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

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

  655.         umx = cx >> 2;

  656.         umy = cy >> 2;

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

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

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

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

  661.             uvmx = uvmy = 4;

  662.     }

  663.     dxy = ly*4 + lx;

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

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

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

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

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

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

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

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

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

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

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

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

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

  677. 

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

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

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

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

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

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

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

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

  686.         srcU = uvbuf;

  687.         srcV = uvbuf + 16;

  688.     }

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

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

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

  692. 

  693.     if(block_type == RV34_MB_P_16x8){

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

  695.         Y    += 8;

  696.         srcY += 8;

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

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

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

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

  701.     }

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

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

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

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

  706. }

  707. 

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

  709.                         const int xoff, const int yoff, int mv_off,

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

  711. {

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

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

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

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

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

  717. }

  718. 

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

  720. {

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

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

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

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

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

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

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

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

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

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

  731. }

  732. 

  733. static void rv34_mc_2mv_skip(RV34DecContext *r)

  734. {

  735.     int i, j;

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

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

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

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

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

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

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

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

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

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

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

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

  748.         }

  749. }

  750. 

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

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

  753. 

  754. /**

  755.  * Decode motion vector differences

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

  757.  */

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

  759. {

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

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

  762.     int i, j, k, l;

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

  764.     int next_bt;

  765. 

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

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

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

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

  770.     }

  771.     switch(block_type){

  772.     case RV34_MB_TYPE_INTRA:

  773.     case RV34_MB_TYPE_INTRA16x16:

  774.         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);

  775.         return 0;

  776.     case RV34_MB_SKIP:

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

  778.             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);

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

  780.             break;

  781.         }

  782.     case RV34_MB_B_DIRECT:

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

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

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

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

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

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

  789.                         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]);

  790.         if(IS_16X16(next_bt)) //we can use whole macroblock MC

  791.             rv34_mc_2mv(r, block_type);

  792.         else

  793.             rv34_mc_2mv_skip(r);

  794.         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);

  795.         break;

  796.     case RV34_MB_P_16x16:

  797.     case RV34_MB_P_MIX16x16:

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

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

  800.         break;

  801.     case RV34_MB_B_FORWARD:

  802.     case RV34_MB_B_BACKWARD:

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

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

  805.         if(r->rv30)

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

  807.         else

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

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

  810.         break;

  811.     case RV34_MB_P_16x8:

  812.     case RV34_MB_P_8x16:

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

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

  815.         if(block_type == RV34_MB_P_16x8){

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

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

  818.         }

  819.         if(block_type == RV34_MB_P_8x16){

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

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

  822.         }

  823.         break;

  824.     case RV34_MB_B_BIDIR:

  825.         rv34_pred_mv_b  (r, block_type, 0);

  826.         rv34_pred_mv_b  (r, block_type, 1);

  827.         rv34_mc_2mv     (r, block_type);

  828.         break;

  829.     case RV34_MB_P_8x8:

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

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

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

  833.         }

  834.         break;

  835.     }

  836. 

  837.     return 0;

  838. }

  839. /** @} */ // mv group

  840. 

  841. /**

  842.  * @defgroup recons Macroblock reconstruction functions

  843.  * @{

  844.  */

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

  846. static const int ittrans[9] = {

  847.  DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,

  848.  VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,

  849. };

  850. 

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

  852. static const int ittrans16[4] = {

  853.  DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,

  854. };

  855. 

  856. /**

  857.  * Perform 4x4 intra prediction.

  858.  */

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

  860. {

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

  862.     uint32_t topleft;

  863. 

  864.     if(!up && !left)

  865.         itype = DC_128_PRED;

  866.     else if(!up){

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

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

  869.     }else if(!left){

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

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

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

  873.     }

  874.     if(!down){

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

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

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

  878.     }

  879.     if(!right && up){

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

  881.         prev = &topleft;

  882.     }

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

  884. }

  885. 

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

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

  888. {

  889.     int x, y;

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

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

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

  893. }

  894. 

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

  896. {

  897.     if(!up && !left)

  898.         itype = DC_128_PRED8x8;

  899.     else if(!up){

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

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

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

  903.     }else if(!left){

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

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

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

  907.     }

  908.     return itype;

  909. }

  910. 

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

  912. {

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

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

  915.     int i, j;

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

  917.     int itype;

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

  919.     int idx;

  920. 

  921.     // Set neighbour information.

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

  923.         avail[0] = 1;

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

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

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

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

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

  929.         avail[5] = 1;

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

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

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

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

  934. 

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

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

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

  938.     if(!is16){

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

  940.             idx = 9 + j*8;

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

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

  943.                 avail[idx] = 1;

  944.                 if(cbp & 1)

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

  946.             }

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

  948.             intra_types += s->b4_stride;

  949.         }

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

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

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

  953.             idx = 5 + j*4;

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

  955.                 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]);

  956.                 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]);

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

  958.                 if(cbp & 0x01)

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

  960.                 if(cbp & 0x10)

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

  962.             }

  963.         }

  964.     }else{

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

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

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

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

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

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

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

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

  973. 

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

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

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

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

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

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

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

  981.     }

  982. }

  983. 

  984. /** @} */ // recons group

  985. 

  986. /**

  987.  * @addtogroup bitstream

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

  989.  */

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

  991. {

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

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

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

  995.     int i, t;

  996. 

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

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

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

  1000.             if(!get_bits1(gb))

  1001.                 av_log(s->avctx, AV_LOG_ERROR, "Need DQUANT\n");

  1002.         }

  1003.         s->current_picture_ptr->mb_type[mb_pos] = r->is16 ? MB_TYPE_INTRA16x16 : MB_TYPE_INTRA;

  1004.         r->block_type = r->is16 ? RV34_MB_TYPE_INTRA16x16 : RV34_MB_TYPE_INTRA;

  1005.     }else{

  1006.         r->block_type = r->decode_mb_info(r);

  1007.         if(r->block_type == -1)

  1008.             return -1;

  1009.         s->current_picture_ptr->mb_type[mb_pos] = rv34_mb_type_to_lavc[r->block_type];

  1010.         r->mb_type[mb_pos] = r->block_type;

  1011.         if(r->block_type == RV34_MB_SKIP){

  1012.             if(s->pict_type == FF_P_TYPE)

  1013.                 r->mb_type[mb_pos] = RV34_MB_P_16x16;

  1014.             if(s->pict_type == FF_B_TYPE)

  1015.                 r->mb_type[mb_pos] = RV34_MB_B_DIRECT;

  1016.         }

  1017.         r->is16 = !!IS_INTRA16x16(s->current_picture_ptr->mb_type[mb_pos]);

  1018.         rv34_decode_mv(r, r->block_type);

  1019.         if(r->block_type == RV34_MB_SKIP){

  1020.             fill_rectangle(intra_types, 4, 4, s->b4_stride, 0, sizeof(intra_types[0]));

  1021.             return 0;

  1022.         }

  1023.         r->chroma_vlc = 1;

  1024.         r->luma_vlc   = 0;

  1025.     }

  1026.     if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){

  1027.         if(r->is16){

  1028.             t = get_bits(gb, 2);

  1029.             fill_rectangle(intra_types, 4, 4, s->b4_stride, t, sizeof(intra_types[0]));

  1030.             r->luma_vlc   = 2;

  1031.         }else{

  1032.             if(r->decode_intra_types(r, gb, intra_types) < 0)

  1033.                 return -1;

  1034.             r->luma_vlc   = 1;

  1035.         }

  1036.         r->chroma_vlc = 0;

  1037.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);

  1038.     }else{

  1039.         for(i = 0; i < 16; i++)

  1040.             intra_types[(i & 3) + (i>>2) * s->b4_stride] = 0;

  1041.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1042.         if(r->mb_type[mb_pos] == RV34_MB_P_MIX16x16){

  1043.             r->is16 = 1;

  1044.             r->chroma_vlc = 1;

  1045.             r->luma_vlc   = 2;

  1046.             r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);

  1047.         }

  1048.     }

  1049. 

  1050.     return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);

  1051. }

  1052. 

  1053. /**

  1054.  * @addtogroup recons

  1055.  * @{

  1056.  */

  1057. /**

  1058.  * mask for retrieving all bits in coded block pattern

  1059.  * corresponding to one 8x8 block

  1060.  */

  1061. #define LUMA_CBP_BLOCK_MASK 0x33

  1062. 

  1063. #define U_CBP_MASK 0x0F0000

  1064. #define V_CBP_MASK 0xF00000

  1065. 

  1066. 

  1067. static void rv34_apply_differences(RV34DecContext *r, int cbp)

  1068. {

  1069.     static const int shifts[4] = { 0, 2, 8, 10 };

  1070.     MpegEncContext *s = &r->s;

  1071.     int i;

  1072. 

  1073.     for(i = 0; i < 4; i++)

  1074.         if((cbp & (LUMA_CBP_BLOCK_MASK << shifts[i])) || r->block_type == RV34_MB_P_MIX16x16)

  1075.             s->dsp.add_pixels_clamped(s->block[i], s->dest[0] + (i & 1)*8 + (i&2)*4*s->linesize, s->linesize);

  1076.     if(cbp & U_CBP_MASK)

  1077.         s->dsp.add_pixels_clamped(s->block[4], s->dest[1], s->uvlinesize);

  1078.     if(cbp & V_CBP_MASK)

  1079.         s->dsp.add_pixels_clamped(s->block[5], s->dest[2], s->uvlinesize);

  1080. }

  1081. 

  1082. static int is_mv_diff_gt_3(int16_t (*motion_val)[2], int step)

  1083. {

  1084.     int d;

  1085.     d = motion_val[0][0] - motion_val[-step][0];

  1086.     if(d < -3 || d > 3)

  1087.         return 1;

  1088.     d = motion_val[0][1] - motion_val[-step][1];

  1089.     if(d < -3 || d > 3)

  1090.         return 1;

  1091.     return 0;

  1092. }

  1093. 

  1094. static int rv34_set_deblock_coef(RV34DecContext *r)

  1095. {

  1096.     MpegEncContext *s = &r->s;

  1097.     int hmvmask = 0, vmvmask = 0, i, j;

  1098.     int midx = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;

  1099.     int16_t (*motion_val)[2] = s->current_picture_ptr->motion_val[0][midx];

  1100.     for(j = 0; j < 16; j += 8){

  1101.         for(i = 0; i < 2; i++){

  1102.             if(is_mv_diff_gt_3(motion_val + i, 1))

  1103.                 vmvmask |= 0x11 << (j + i*2);

  1104.             if((j || s->mb_y) && is_mv_diff_gt_3(motion_val + i, s->b8_stride))

  1105.                 hmvmask |= 0x03 << (j + i*2);

  1106.         }

  1107.         motion_val += s->b8_stride;

  1108.     }

  1109.     if(s->first_slice_line)

  1110.         hmvmask &= ~0x000F;

  1111.     if(!s->mb_x)

  1112.         vmvmask &= ~0x1111;

  1113.     if(r->rv30){ //RV30 marks both subblocks on the edge for filtering

  1114.         vmvmask |= (vmvmask & 0x4444) >> 1;

  1115.         hmvmask |= (hmvmask & 0x0F00) >> 4;

  1116.         if(s->mb_x)

  1117.             r->deblock_coefs[s->mb_x - 1 + s->mb_y*s->mb_stride] |= (vmvmask & 0x1111) << 3;

  1118.         if(!s->first_slice_line)

  1119.             r->deblock_coefs[s->mb_x + (s->mb_y - 1)*s->mb_stride] |= (hmvmask & 0xF) << 12;

  1120.     }

  1121.     return hmvmask | vmvmask;

  1122. }

  1123. 

  1124. static int rv34_decode_macroblock(RV34DecContext *r, int8_t *intra_types)

  1125. {

  1126.     MpegEncContext *s = &r->s;

  1127.     GetBitContext *gb = &s->gb;

  1128.     int cbp, cbp2;

  1129.     int i, blknum, blkoff;

  1130.     DCTELEM block16[64];

  1131.     int luma_dc_quant;

  1132.     int dist;

  1133.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1134. 

  1135.     // Calculate which neighbours are available. Maybe it's worth optimizing too.

  1136.     memset(r->avail_cache, 0, sizeof(r->avail_cache));

  1137.     fill_rectangle(r->avail_cache + 5, 2, 2, 4, 1, 4);

  1138.     dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;

  1139.     if(s->mb_x && dist)

  1140.         r->avail_cache[4] =

  1141.         r->avail_cache[8] = s->current_picture_ptr->mb_type[mb_pos - 1];

  1142.     if(dist >= s->mb_width)

  1143.         r->avail_cache[1] =

  1144.         r->avail_cache[2] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];

  1145.     if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)

  1146.         r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];

  1147.     if(s->mb_x && dist > s->mb_width)

  1148.         r->avail_cache[0] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];

  1149. 

  1150.     s->qscale = r->si.quant;

  1151.     cbp = cbp2 = rv34_decode_mb_header(r, intra_types);

  1152.     r->cbp_luma  [mb_pos] = cbp;

  1153.     r->cbp_chroma[mb_pos] = cbp >> 16;

  1154.     if(s->pict_type == FF_I_TYPE)

  1155.         r->deblock_coefs[mb_pos] = 0xFFFF;

  1156.     else

  1157.         r->deblock_coefs[mb_pos] = rv34_set_deblock_coef(r) | r->cbp_luma[mb_pos];

  1158.     s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;

  1159. 

  1160.     if(cbp == -1)

  1161.         return -1;

  1162. 

  1163.     luma_dc_quant = r->block_type == RV34_MB_P_MIX16x16 ? r->luma_dc_quant_p[s->qscale] : r->luma_dc_quant_i[s->qscale];

  1164.     if(r->is16){

  1165.         memset(block16, 0, sizeof(block16));

  1166.         rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0);

  1167.         rv34_dequant4x4_16x16(block16, rv34_qscale_tab[luma_dc_quant],rv34_qscale_tab[s->qscale]);

  1168.         rv34_inv_transform_noround(block16);

  1169.     }

  1170. 

  1171.     for(i = 0; i < 16; i++, cbp >>= 1){

  1172.         if(!r->is16 && !(cbp & 1)) continue;

  1173.         blknum = ((i & 2) >> 1) + ((i & 8) >> 2);

  1174.         blkoff = ((i & 1) << 2) + ((i & 4) << 3);

  1175.         if(cbp & 1)

  1176.             rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->luma_vlc, 0);

  1177.         rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[s->qscale],rv34_qscale_tab[s->qscale]);

  1178.         if(r->is16) //FIXME: optimize

  1179.             s->block[blknum][blkoff] = block16[(i & 3) | ((i & 0xC) << 1)];

  1180.         rv34_inv_transform(s->block[blknum] + blkoff);

  1181.     }

  1182.     if(r->block_type == RV34_MB_P_MIX16x16)

  1183.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1184.     for(; i < 24; i++, cbp >>= 1){

  1185.         if(!(cbp & 1)) continue;

  1186.         blknum = ((i & 4) >> 2) + 4;

  1187.         blkoff = ((i & 1) << 2) + ((i & 2) << 4);

  1188.         rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->chroma_vlc, 1);

  1189.         rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]],rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]]);

  1190.         rv34_inv_transform(s->block[blknum] + blkoff);

  1191.     }

  1192.     if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos]))

  1193.         rv34_output_macroblock(r, intra_types, cbp2, r->is16);

  1194.     else

  1195.         rv34_apply_differences(r, cbp2);

  1196. 

  1197.     return 0;

  1198. }

  1199. 

  1200. static int check_slice_end(RV34DecContext *r, MpegEncContext *s)

  1201. {

  1202.     int bits;

  1203.     if(s->mb_y >= s->mb_height)

  1204.         return 1;

  1205.     if(!s->mb_num_left)

  1206.         return 1;

  1207.     if(r->s.mb_skip_run > 1)

  1208.         return 0;

  1209.     bits = r->bits - get_bits_count(&s->gb);

  1210.     if(bits < 0 || (bits < 8 && !show_bits(&s->gb, bits)))

  1211.         return 1;

  1212.     return 0;

  1213. }

  1214. 

  1215. static inline int slice_compare(SliceInfo *si1, SliceInfo *si2)

  1216. {

  1217.     return si1->type   != si2->type  ||

  1218.            si1->start  >= si2->start ||

  1219.            si1->width  != si2->width ||

  1220.            si1->height != si2->height||

  1221.            si1->pts    != si2->pts;

  1222. }

  1223. 

  1224. static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int buf_size)

  1225. {

  1226.     MpegEncContext *s = &r->s;

  1227.     GetBitContext *gb = &s->gb;

  1228.     int mb_pos;

  1229.     int res;

  1230. 

  1231.     init_get_bits(&r->s.gb, buf, buf_size*8);

  1232.     res = r->parse_slice_header(r, gb, &r->si);

  1233.     if(res < 0){

  1234.         av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");

  1235.         return -1;

  1236.     }

  1237. 

  1238.     if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr==NULL) {

  1239.         if(s->width != r->si.width || s->height != r->si.height){

  1240.             av_log(s->avctx, AV_LOG_DEBUG, "Changing dimensions to %dx%d\n", r->si.width,r->si.height);

  1241.             MPV_common_end(s);

  1242.             s->width  = r->si.width;

  1243.             s->height = r->si.height;

  1244.             if(MPV_common_init(s) < 0)

  1245.                 return -1;

  1246.             r->intra_types_hist = av_realloc(r->intra_types_hist, s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1247.             r->intra_types = r->intra_types_hist + s->b4_stride * 4;

  1248.             r->mb_type = av_realloc(r->mb_type, r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));

  1249.             r->cbp_luma   = av_realloc(r->cbp_luma,   r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));

  1250.             r->cbp_chroma = av_realloc(r->cbp_chroma, r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));

  1251.             r->deblock_coefs = av_realloc(r->deblock_coefs, r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));

  1252.         }

  1253.         s->pict_type = r->si.type ? r->si.type : FF_I_TYPE;

  1254.         if(MPV_frame_start(s, s->avctx) < 0)

  1255.             return -1;

  1256.         ff_er_frame_start(s);

  1257.         r->cur_pts = r->si.pts;

  1258.         if(s->pict_type != FF_B_TYPE){

  1259.             r->last_pts = r->next_pts;

  1260.             r->next_pts = r->cur_pts;

  1261.         }

  1262.         s->mb_x = s->mb_y = 0;

  1263.     }

  1264. 

  1265.     r->si.end = end;

  1266.     s->qscale = r->si.quant;

  1267.     r->bits = buf_size*8;

  1268.     s->mb_num_left = r->si.end - r->si.start;

  1269.     r->s.mb_skip_run = 0;

  1270. 

  1271.     mb_pos = s->mb_x + s->mb_y * s->mb_width;

  1272.     if(r->si.start != mb_pos){

  1273.         av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);

  1274.         s->mb_x = r->si.start % s->mb_width;

  1275.         s->mb_y = r->si.start / s->mb_width;

  1276.     }

  1277.     memset(r->intra_types_hist, -1, s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1278.     s->first_slice_line = 1;

  1279.     s->resync_mb_x= s->mb_x;

  1280.     s->resync_mb_y= s->mb_y;

  1281. 

  1282.     ff_init_block_index(s);

  1283.     while(!check_slice_end(r, s)) {

  1284.         ff_update_block_index(s);

  1285.         s->dsp.clear_blocks(s->block[0]);

  1286. 

  1287.         if(rv34_decode_macroblock(r, r->intra_types + s->mb_x * 4 + 1) < 0){

  1288.             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);

  1289.             return -1;

  1290.         }

  1291.         if (++s->mb_x == s->mb_width) {

  1292.             s->mb_x = 0;

  1293.             s->mb_y++;

  1294.             ff_init_block_index(s);

  1295. 

  1296.             memmove(r->intra_types_hist, r->intra_types, s->b4_stride * 4 * sizeof(*r->intra_types_hist));

  1297.             memset(r->intra_types, -1, s->b4_stride * 4 * sizeof(*r->intra_types_hist));

  1298. 

  1299.             if(r->loop_filter && s->mb_y >= 2)

  1300.                 r->loop_filter(r, s->mb_y - 2);

  1301.         }

  1302.         if(s->mb_x == s->resync_mb_x)

  1303.             s->first_slice_line=0;

  1304.         s->mb_num_left--;

  1305.     }

  1306.     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);

  1307. 

  1308.     return s->mb_y == s->mb_height;

  1309. }

  1310. 

  1311. /** @} */ // recons group end

  1312. 

  1313. /**

  1314.  * Initialize decoder.

  1315.  */

  1316. av_cold int ff_rv34_decode_init(AVCodecContext *avctx)

  1317. {

  1318.     RV34DecContext *r = avctx->priv_data;

  1319.     MpegEncContext *s = &r->s;

  1320. 

  1321.     MPV_decode_defaults(s);

  1322.     s->avctx= avctx;

  1323.     s->out_format = FMT_H263;

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

  1325. 

  1326.     s->width = avctx->width;

  1327.     s->height = avctx->height;

  1328. 

  1329.     r->s.avctx = avctx;

  1330.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  1331.     r->s.flags |= CODEC_FLAG_EMU_EDGE;

  1332.     avctx->pix_fmt = PIX_FMT_YUV420P;

  1333.     avctx->has_b_frames = 1;

  1334.     s->low_delay = 0;

  1335. 

  1336.     if (MPV_common_init(s) < 0)

  1337.         return -1;

  1338. 

  1339.     ff_h264_pred_init(&r->h, CODEC_ID_RV40);

  1340. 

  1341.     r->intra_types_hist = av_malloc(s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1342.     r->intra_types = r->intra_types_hist + s->b4_stride * 4;

  1343. 

  1344.     r->mb_type = av_mallocz(r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));

  1345. 

  1346.     r->cbp_luma   = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));

  1347.     r->cbp_chroma = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));

  1348.     r->deblock_coefs = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));

  1349. 

  1350.     if(!intra_vlcs[0].cbppattern[0].bits)

  1351.         rv34_init_tables();

  1352. 

  1353.     return 0;

  1354. }

  1355. 

  1356. static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)

  1357. {

  1358.     if(avctx->slice_count) return avctx->slice_offset[n];

  1359.     else                   return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) :  AV_RB32(buf + n*8);

  1360. }

  1361. 

  1362. int ff_rv34_decode_frame(AVCodecContext *avctx,

  1363.                             void *data, int *data_size,

  1364.                             const uint8_t *buf, int buf_size)

  1365. {

  1366.     RV34DecContext *r = avctx->priv_data;

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

  1368.     AVFrame *pict = data;

  1369.     SliceInfo si;

  1370.     int i;

  1371.     int slice_count;

  1372.     const uint8_t *slices_hdr = NULL;

  1373.     int last = 0;

  1374. 

  1375.     /* no supplementary picture */

  1376.     if (buf_size == 0) {

  1377.         /* special case for last picture */

  1378.         if (s->low_delay==0 && s->next_picture_ptr) {

  1379.             *pict= *(AVFrame*)s->next_picture_ptr;

  1380.             s->next_picture_ptr= NULL;

  1381. 

  1382.             *data_size = sizeof(AVFrame);

  1383.         }

  1384.         return 0;

  1385.     }

  1386. 

  1387.     if(!avctx->slice_count){

  1388.         slice_count = (*buf++) + 1;

  1389.         slices_hdr = buf + 4;

  1390.         buf += 8 * slice_count;

  1391.     }else

  1392.         slice_count = avctx->slice_count;

  1393. 

  1394.     for(i=0; i<slice_count; i++){

  1395.         int offset= get_slice_offset(avctx, slices_hdr, i);

  1396.         int size;

  1397.         if(i+1 == slice_count)

  1398.             size= buf_size - offset;

  1399.         else

  1400.             size= get_slice_offset(avctx, slices_hdr, i+1) - offset;

  1401. 

  1402.         if(offset > buf_size){

  1403.             av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");

  1404.             break;

  1405.         }

  1406. 

  1407.         r->si.end = s->mb_width * s->mb_height;

  1408.         if(i+1 < slice_count){

  1409.             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);

  1410.             if(r->parse_slice_header(r, &r->s.gb, &si) < 0){

  1411.                 if(i+2 < slice_count)

  1412.                     size = get_slice_offset(avctx, slices_hdr, i+2) - offset;

  1413.                 else

  1414.                     size = buf_size - offset;

  1415.             }else

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

  1417.         }

  1418.         if(!i && si.type == FF_B_TYPE && (!s->last_picture_ptr || !s->last_picture_ptr->data[0]))

  1419.             return -1;

  1420.         last = rv34_decode_slice(r, r->si.end, buf + offset, size);

  1421.         s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;

  1422.         if(last)

  1423.             break;

  1424.     }

  1425. 

  1426.     if(last){

  1427.         if(r->loop_filter)

  1428.             r->loop_filter(r, s->mb_height - 1);

  1429.         ff_er_frame_end(s);

  1430.         MPV_frame_end(s);

  1431.         if (s->pict_type == FF_B_TYPE || s->low_delay) {

  1432.             *pict= *(AVFrame*)s->current_picture_ptr;

  1433.         } else if (s->last_picture_ptr != NULL) {

  1434.             *pict= *(AVFrame*)s->last_picture_ptr;

  1435.         }

  1436. 

  1437.         if(s->last_picture_ptr || s->low_delay){

  1438.             *data_size = sizeof(AVFrame);

  1439.             ff_print_debug_info(s, pict);

  1440.         }

  1441.         s->current_picture_ptr= NULL; //so we can detect if frame_end wasnt called (find some nicer solution...)

  1442.     }

  1443.     return buf_size;

  1444. }

  1445. 

  1446. av_cold int ff_rv34_decode_end(AVCodecContext *avctx)

  1447. {

  1448.     RV34DecContext *r = avctx->priv_data;

  1449. 

  1450.     MPV_common_end(&r->s);

  1451. 

  1452.     av_freep(&r->intra_types_hist);

  1453.     r->intra_types = NULL;

  1454.     av_freep(&r->mb_type);

  1455.     av_freep(&r->cbp_luma);

  1456.     av_freep(&r->cbp_chroma);

  1457.     av_freep(&r->deblock_coefs);

  1458. 

  1459.     return 0;

  1460. }