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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 "rectangle.h"

  32. 

  33. #include "rv34vlc.h"

  34. #include "rv34data.h"

  35. #include "rv34.h"

  36. 

  37. //#define DEBUG

  38. 

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

  40. static const int rv34_mb_type_to_lavc[12] = {

  41.     MB_TYPE_INTRA,

  42.     MB_TYPE_INTRA16x16              | MB_TYPE_SEPARATE_DC,

  43.     MB_TYPE_16x16   | MB_TYPE_L0,

  44.     MB_TYPE_8x8     | MB_TYPE_L0,

  45.     MB_TYPE_16x16   | MB_TYPE_L0,

  46.     MB_TYPE_16x16   | MB_TYPE_L1,

  47.     MB_TYPE_SKIP,

  48.     MB_TYPE_DIRECT2 | MB_TYPE_16x16,

  49.     MB_TYPE_16x8    | MB_TYPE_L0,

  50.     MB_TYPE_8x16    | MB_TYPE_L0,

  51.     MB_TYPE_16x16   | MB_TYPE_L0L1,

  52.     MB_TYPE_16x16   | MB_TYPE_L0    | MB_TYPE_SEPARATE_DC

  53. };

  54. 

  55. 

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

  57. 

  58. /**

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

  60.  * @{

  61.  */

  62. 

  63. /**

  64.  * Generate VLC from codeword lengths.

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

  66.  * @param size   length of input data

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

  68.  */

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

  70. {

  71.     int i;

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

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

  74.     uint8_t bits2[size];

  75.     int maxbits = 0, realsize = 0;

  76. 

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

  78.         if(bits[i]){

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

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

  81.             realsize++;

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

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

  84.         }

  85.     }

  86. 

  87.     codes[0] = 0;

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

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

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

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

  92. 

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

  94.                     bits2, 1, 1,

  95.                     cw,    2, 2,

  96.                     syms,  2, 2, INIT_VLC_USE_STATIC);

  97. }

  98. 

  99. /**

  100.  * Initialize all tables.

  101.  */

  102. static av_cold void rv34_init_tables()

  103. {

  104.     int i, j, k;

  105. 

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

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

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

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

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

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

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

  113.         }

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

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

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

  117.     }

  118. 

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

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

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

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

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

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

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

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

  127.         }

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

  129.     }

  130. }

  131. 

  132. /** @} */ // vlc group

  133. 

  134. 

  135. /**

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

  137.  * @{

  138.  */

  139. 

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

  141. {

  142.     int i;

  143. 

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

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

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

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

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

  149. 

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

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

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

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

  154.     }

  155. }

  156. 

  157. /**

  158.  * Real Video 3.0/4.0 inverse transform

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

  160.  */

  161. static void rv34_inv_transform(DCTELEM *block){

  162.     int temp[16];

  163.     int i;

  164. 

  165.     rv34_row_transform(temp, block);

  166. 

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

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

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

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

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

  172. 

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

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

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

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

  177.     }

  178. 

  179. }

  180. 

  181. /**

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

  183.  *

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

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

  186.  */

  187. static void rv34_inv_transform_noround(DCTELEM *block){

  188.     int temp[16];

  189.     int i;

  190. 

  191.     rv34_row_transform(temp, block);

  192. 

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

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

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

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

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

  198. 

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

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

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

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

  203.     }

  204. 

  205. }

  206. 

  207. /** @} */ // transform

  208. 

  209. 

  210. /**

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

  212.  * @{

  213.  */

  214. 

  215. /**

  216.  * Decode coded block pattern.

  217.  */

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

  219. {

  220.     int pattern, code, cbp=0;

  221.     int ones;

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

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

  224.     int *curshift = shifts;

  225.     int i, t, mask;

  226. 

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

  228.     pattern = code & 0xF;

  229.     code >>= 4;

  230. 

  231.     ones = rv34_count_ones[pattern];

  232. 

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

  234.         if(pattern & mask)

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

  236.     }

  237. 

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

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

  240.         if(t == 1)

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

  242.         if(t == 2)

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

  244.     }

  245.     return cbp;

  246. }

  247. 

  248. /**

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

  250.  */

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

  252. {

  253.     if(coef){

  254.         if(coef == esc){

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

  256.             if(coef > 23){

  257.                 coef -= 23;

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

  259.             }

  260.             coef += esc;

  261.         }

  262.         if(get_bits1(gb))

  263.             coef = -coef;

  264.         *dst = coef;

  265.     }

  266. }

  267. 

  268. /**

  269.  * Decode 2x2 subblock of coefficients.

  270.  */

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

  272. {

  273.     int coeffs[4];

  274. 

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

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

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

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

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

  280.     if(is_block2){

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

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

  283.     }else{

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

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

  286.     }

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

  288. }

  289. 

  290. /**

  291.  * Decode coefficients for 4x4 block.

  292.  *

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

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

  295.  *  o--o

  296.  *    /

  297.  *   /

  298.  *  o--o

  299.  */

  300. 

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

  302. {

  303.     int code, pattern;

  304. 

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

  306. 

  307.     pattern = code & 0x7;

  308. 

  309.     code >>= 3;

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

  311. 

  312.     if(pattern & 4){

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

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

  315.     }

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

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

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

  319.     }

  320.     if(pattern & 1){

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

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

  323.     }

  324. 

  325. }

  326. 

  327. /**

  328.  * Dequantize ordinary 4x4 block.

  329.  * @todo optimize

  330.  */

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

  332. {

  333.     int i, j;

  334. 

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

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

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

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

  339. }

  340. 

  341. /**

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

  343.  * @todo optimize

  344.  */

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

  346. {

  347.     int i;

  348. 

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

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

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

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

  353. }

  354. /** @} */ //block functions

  355. 

  356. 

  357. /**

  358.  * @defgroup bitstream RV30/40 bitstream parsing

  359.  * @{

  360.  */

  361. 

  362. /**

  363.  * Decode starting slice position.

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

  365.  */

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

  367. {

  368.     int i;

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

  370.         if(rv34_mb_max_sizes[i] > mb_size)

  371.             break;

  372.     return rv34_mb_bits_sizes[i];

  373. }

  374. 

  375. /**

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

  377.  */

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

  379. {

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

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

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

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

  384. }

  385. 

  386. /**

  387.  * Decode quantizer difference and return modified quantizer.

  388.  */

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

  390. {

  391.     if(get_bits1(gb))

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

  393.     else

  394.         return get_bits(gb, 5);

  395. }

  396. 

  397. /** @} */ //bitstream functions

  398. 

  399. /**

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

  401.  * @{

  402.  */

  403. 

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

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

  406. 

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

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

  409. 

  410. /** availability index for subblocks */

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

  412. 

  413. /**

  414.  * motion vector prediction

  415.  *

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

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

  418.  * some other vectors may be used instead.

  419.  */

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

  421. {

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

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

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

  425.     int i, j;

  426.     int mx, my;

  427.     int avail_index = avail_indexes[subblock_no];

  428.     int c_off = part_sizes_w[block_type];

  429. 

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

  431.     if(subblock_no == 3)

  432.         c_off = -1;

  433. 

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

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

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

  437.     }

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

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

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

  441.     }else{

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

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

  444.     }

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

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

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

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

  449.         }else{

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

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

  452.         }

  453.     }else{

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

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

  456.     }

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

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

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

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

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

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

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

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

  465.         }

  466.     }

  467. }

  468. 

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

  470. 

  471. /**

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

  473.  */

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

  475. {

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

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

  478.     int mul;

  479. 

  480.     if(!refdist) return 0;

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

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

  483. }

  484. 

  485. /**

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

  487.  */

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

  489.                                       int A_avail, int B_avail, int C_avail,

  490.                                       int *mx, int *my)

  491. {

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

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

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

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

  496.             *mx /= 2;

  497.             *my /= 2;

  498.         }

  499.     }else{

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

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

  502.     }

  503. }

  504. 

  505. /**

  506.  * motion vector prediction for B-frames

  507.  */

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

  509. {

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

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

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

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

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

  515.     int mx, my;

  516.     int i, j;

  517.     Picture *cur_pic = s->current_picture_ptr;

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

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

  520. 

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

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

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

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

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

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

  527.         has_A = 1;

  528.     }

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

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

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

  532.         has_B = 1;

  533.     }

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

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

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

  537.         has_C = 1;

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

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

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

  541.         has_C = 1;

  542.     }

  543. 

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

  545. 

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

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

  548. 

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

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

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

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

  553.         }

  554.     }

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

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

  557. }

  558. 

  559. /**

  560.  * motion vector prediction - RV3 version

  561.  */

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

  563. {

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

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

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

  567.     int i, j;

  568.     int mx, my;

  569.     int avail_index = avail_indexes[0];

  570. 

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

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

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

  574.     }

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

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

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

  578.     }else{

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

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

  581.     }

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

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

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

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

  586.         }else{

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

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

  589.         }

  590.     }else{

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

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

  593.     }

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

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

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

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

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

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

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

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

  602.         }

  603.     }

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

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

  606. }

  607. 

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

  609. 

  610. /**

  611.  * generic motion compensation function

  612.  *

  613.  * @param r decoder context

  614.  * @param block_type type of the current block

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

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

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

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

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

  620.  */

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

  622.                           const int xoff, const int yoff, int mv_off,

  623.                           const int width, const int height, int dir,

  624.                           const int thirdpel,

  625.                           qpel_mc_func (*qpel_mc)[16],

  626.                           h264_chroma_mc_func (*chroma_mc))

  627. {

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

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

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

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

  632.     int is16x16 = 1;

  633. 

  634.     if(thirdpel){

  635.         int chroma_mx, chroma_my;

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

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

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

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

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

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

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

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

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

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

  646.     }else{

  647.         int cx, cy;

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

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

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

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

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

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

  654.         umx = cx >> 2;

  655.         umy = cy >> 2;

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

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

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

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

  660.             uvmx = uvmy = 4;

  661.     }

  662.     dxy = ly*4 + lx;

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

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

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

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

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

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

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

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

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

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

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

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

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

  676. 

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

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

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

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

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

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

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

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

  685.         srcU = uvbuf;

  686.         srcV = uvbuf + 16;

  687.     }

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

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

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

  691. 

  692.     if(block_type == RV34_MB_P_16x8){

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

  694.         Y    += 8;

  695.         srcY += 8;

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

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

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

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

  700.     }

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

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

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

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

  705. }

  706. 

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

  708.                         const int xoff, const int yoff, int mv_off,

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

  710. {

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

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

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

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

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

  716. }

  717. 

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

  719. {

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

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

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

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

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

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

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

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

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

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

  730. }

  731. 

  732. static void rv34_mc_2mv_skip(RV34DecContext *r)

  733. {

  734.     int i, j;

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

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

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

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

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

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

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

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

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

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

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

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

  747.         }

  748. }

  749. 

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

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

  752. 

  753. /**

  754.  * Decode motion vector differences

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

  756.  */

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

  758. {

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

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

  761.     int i, j, k, l;

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

  763.     int next_bt;

  764. 

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

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

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

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

  769.     }

  770.     switch(block_type){

  771.     case RV34_MB_TYPE_INTRA:

  772.     case RV34_MB_TYPE_INTRA16x16:

  773.         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);

  774.         return 0;

  775.     case RV34_MB_SKIP:

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

  777.             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);

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

  779.             break;

  780.         }

  781.     case RV34_MB_B_DIRECT:

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

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

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

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

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

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

  788.                         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]);

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

  790.             rv34_mc_2mv(r, block_type);

  791.         else

  792.             rv34_mc_2mv_skip(r);

  793.         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);

  794.         break;

  795.     case RV34_MB_P_16x16:

  796.     case RV34_MB_P_MIX16x16:

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

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

  799.         break;

  800.     case RV34_MB_B_FORWARD:

  801.     case RV34_MB_B_BACKWARD:

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

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

  804.         if(r->rv30)

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

  806.         else

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

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

  809.         break;

  810.     case RV34_MB_P_16x8:

  811.     case RV34_MB_P_8x16:

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

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

  814.         if(block_type == RV34_MB_P_16x8){

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

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

  817.         }

  818.         if(block_type == RV34_MB_P_8x16){

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

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

  821.         }

  822.         break;

  823.     case RV34_MB_B_BIDIR:

  824.         rv34_pred_mv_b  (r, block_type, 0);

  825.         rv34_pred_mv_b  (r, block_type, 1);

  826.         rv34_mc_2mv     (r, block_type);

  827.         break;

  828.     case RV34_MB_P_8x8:

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

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

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

  832.         }

  833.         break;

  834.     }

  835. 

  836.     return 0;

  837. }

  838. /** @} */ // mv group

  839. 

  840. /**

  841.  * @defgroup recons Macroblock reconstruction functions

  842.  * @{

  843.  */

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

  845. static const int ittrans[9] = {

  846.  DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,

  847.  VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,

  848. };

  849. 

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

  851. static const int ittrans16[4] = {

  852.  DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,

  853. };

  854. 

  855. /**

  856.  * Perform 4x4 intra prediction.

  857.  */

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

  859. {

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

  861.     uint32_t topleft;

  862. 

  863.     if(!up && !left)

  864.         itype = DC_128_PRED;

  865.     else if(!up){

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

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

  868.     }else if(!left){

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

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

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

  872.     }

  873.     if(!down){

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

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

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

  877.     }

  878.     if(!right && up){

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

  880.         prev = &topleft;

  881.     }

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

  883. }

  884. 

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

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

  887. {

  888.     int x, y;

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

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

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

  892. }

  893. 

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

  895. {

  896.     if(!up && !left)

  897.         itype = DC_128_PRED8x8;

  898.     else if(!up){

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

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

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

  902.     }else if(!left){

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

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

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

  906.     }

  907.     return itype;

  908. }

  909. 

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

  911. {

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

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

  914.     int i, j;

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

  916.     int itype;

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

  918.     int idx;

  919. 

  920.     // Set neighbour information.

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

  922.         avail[0] = 1;

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

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

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

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

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

  928.         avail[5] = 1;

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

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

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

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

  933. 

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

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

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

  937.     if(!is16){

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

  939.             idx = 9 + j*8;

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

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

  942.                 avail[idx] = 1;

  943.                 if(cbp & 1)

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

  945.             }

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

  947.             intra_types += s->b4_stride;

  948.         }

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

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

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

  952.             idx = 5 + j*4;

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

  954.                 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]);

  955.                 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]);

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

  957.                 if(cbp & 0x01)

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

  959.                 if(cbp & 0x10)

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

  961.             }

  962.         }

  963.     }else{

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

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

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

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

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

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

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

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

  972. 

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

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

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

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

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

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

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

  980.     }

  981. }

  982. 

  983. /** @} */ // recons group

  984. 

  985. /**

  986.  * @addtogroup bitstream

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

  988.  */

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

  990. {

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

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

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

  994.     int i, t;

  995. 

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

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

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

  999.             if(!get_bits1(gb))

  1000.                 av_log(s->avctx, AV_LOG_ERROR, "Need DQUANT\n");

  1001.         }

  1002.         s->current_picture_ptr->mb_type[mb_pos] = r->is16 ? MB_TYPE_INTRA16x16 : MB_TYPE_INTRA;

  1003.         r->block_type = r->is16 ? RV34_MB_TYPE_INTRA16x16 : RV34_MB_TYPE_INTRA;

  1004.     }else{

  1005.         r->block_type = r->decode_mb_info(r);

  1006.         if(r->block_type == -1)

  1007.             return -1;

  1008.         s->current_picture_ptr->mb_type[mb_pos] = rv34_mb_type_to_lavc[r->block_type];

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

  1010.         if(r->block_type == RV34_MB_SKIP){

  1011.             if(s->pict_type == FF_P_TYPE)

  1012.                 r->mb_type[mb_pos] = RV34_MB_P_16x16;

  1013.             if(s->pict_type == FF_B_TYPE)

  1014.                 r->mb_type[mb_pos] = RV34_MB_B_DIRECT;

  1015.         }

  1016.         r->is16 = !!IS_INTRA16x16(s->current_picture_ptr->mb_type[mb_pos]);

  1017.         rv34_decode_mv(r, r->block_type);

  1018.         if(r->block_type == RV34_MB_SKIP){

  1019.             fill_rectangle(intra_types, 4, 4, s->b4_stride, 0, sizeof(intra_types[0]));

  1020.             return 0;

  1021.         }

  1022.         r->chroma_vlc = 1;

  1023.         r->luma_vlc   = 0;

  1024.     }

  1025.     if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){

  1026.         if(r->is16){

  1027.             t = get_bits(gb, 2);

  1028.             fill_rectangle(intra_types, 4, 4, s->b4_stride, t, sizeof(intra_types[0]));

  1029.             r->luma_vlc   = 2;

  1030.         }else{

  1031.             if(r->decode_intra_types(r, gb, intra_types) < 0)

  1032.                 return -1;

  1033.             r->luma_vlc   = 1;

  1034.         }

  1035.         r->chroma_vlc = 0;

  1036.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);

  1037.     }else{

  1038.         for(i = 0; i < 16; i++)

  1039.             intra_types[(i & 3) + (i>>2) * s->b4_stride] = 0;

  1040.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1041.         if(r->mb_type[mb_pos] == RV34_MB_P_MIX16x16){

  1042.             r->is16 = 1;

  1043.             r->chroma_vlc = 1;

  1044.             r->luma_vlc   = 2;

  1045.             r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);

  1046.         }

  1047.     }

  1048. 

  1049.     return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);

  1050. }

  1051. 

  1052. /**

  1053.  * @addtogroup recons

  1054.  * @{

  1055.  */

  1056. /**

  1057.  * mask for retrieving all bits in coded block pattern

  1058.  * corresponding to one 8x8 block

  1059.  */

  1060. #define LUMA_CBP_BLOCK_MASK 0x33

  1061. 

  1062. #define U_CBP_MASK 0x0F0000

  1063. #define V_CBP_MASK 0xF00000

  1064. 

  1065. 

  1066. static void rv34_apply_differences(RV34DecContext *r, int cbp)

  1067. {

  1068.     static const int shifts[4] = { 0, 2, 8, 10 };

  1069.     MpegEncContext *s = &r->s;

  1070.     int i;

  1071. 

  1072.     for(i = 0; i < 4; i++)

  1073.         if((cbp & (LUMA_CBP_BLOCK_MASK << shifts[i])) || r->block_type == RV34_MB_P_MIX16x16)

  1074.             s->dsp.add_pixels_clamped(s->block[i], s->dest[0] + (i & 1)*8 + (i&2)*4*s->linesize, s->linesize);

  1075.     if(cbp & U_CBP_MASK)

  1076.         s->dsp.add_pixels_clamped(s->block[4], s->dest[1], s->uvlinesize);

  1077.     if(cbp & V_CBP_MASK)

  1078.         s->dsp.add_pixels_clamped(s->block[5], s->dest[2], s->uvlinesize);

  1079. }

  1080. 

  1081. static int is_mv_diff_gt_3(int16_t (*motion_val)[2], int step)

  1082. {

  1083.     int d;

  1084.     d = motion_val[0][0] - motion_val[-step][0];

  1085.     if(d < -3 || d > 3)

  1086.         return 1;

  1087.     d = motion_val[0][1] - motion_val[-step][1];

  1088.     if(d < -3 || d > 3)

  1089.         return 1;

  1090.     return 0;

  1091. }

  1092. 

  1093. static int rv34_set_deblock_coef(RV34DecContext *r)

  1094. {

  1095.     MpegEncContext *s = &r->s;

  1096.     int hmvmask = 0, vmvmask = 0, i, j;

  1097.     int midx = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;

  1098.     int16_t (*motion_val)[2] = s->current_picture_ptr->motion_val[0][midx];

  1099.     for(j = 0; j < 16; j += 8){

  1100.         for(i = 0; i < 2; i++){

  1101.             if(is_mv_diff_gt_3(motion_val + i, 1))

  1102.                 vmvmask |= 0x11 << (j + i*2);

  1103.             if((j || s->mb_y) && is_mv_diff_gt_3(motion_val + i, s->b8_stride))

  1104.                 hmvmask |= 0x03 << (j + i*2);

  1105.         }

  1106.         motion_val += s->b8_stride;

  1107.     }

  1108.     if(s->first_slice_line)

  1109.         hmvmask &= ~0x000F;

  1110.     if(!s->mb_x)

  1111.         vmvmask &= ~0x1111;

  1112.     return hmvmask | vmvmask; //XXX: should be stored separately for RV3

  1113. }

  1114. 

  1115. static int rv34_decode_macroblock(RV34DecContext *r, int8_t *intra_types)

  1116. {

  1117.     MpegEncContext *s = &r->s;

  1118.     GetBitContext *gb = &s->gb;

  1119.     int cbp, cbp2;

  1120.     int i, blknum, blkoff;

  1121.     DCTELEM block16[64];

  1122.     int luma_dc_quant;

  1123.     int dist;

  1124.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1125. 

  1126.     // Calculate which neighbours are available. Maybe it's worth optimizing too.

  1127.     memset(r->avail_cache, 0, sizeof(r->avail_cache));

  1128.     fill_rectangle(r->avail_cache + 5, 2, 2, 4, 1, 4);

  1129.     dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;

  1130.     if(s->mb_x && dist)

  1131.         r->avail_cache[4] =

  1132.         r->avail_cache[8] = s->current_picture_ptr->mb_type[mb_pos - 1];

  1133.     if(dist >= s->mb_width)

  1134.         r->avail_cache[1] =

  1135.         r->avail_cache[2] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];

  1136.     if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)

  1137.         r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];

  1138.     if(s->mb_x && dist > s->mb_width)

  1139.         r->avail_cache[0] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];

  1140. 

  1141.     s->qscale = r->si.quant;

  1142.     cbp = cbp2 = rv34_decode_mb_header(r, intra_types);

  1143.     r->cbp_luma  [s->mb_x + s->mb_y * s->mb_stride] = cbp;

  1144.     r->cbp_chroma[s->mb_x + s->mb_y * s->mb_stride] = cbp >> 16;

  1145.     if(s->pict_type == FF_I_TYPE)

  1146.         r->deblock_coefs[mb_pos] = 0;

  1147.     else

  1148.         r->deblock_coefs[mb_pos] = rv34_set_deblock_coef(r);

  1149.     s->current_picture_ptr->qscale_table[s->mb_x + s->mb_y * s->mb_stride] = s->qscale;

  1150. 

  1151.     if(cbp == -1)

  1152.         return -1;

  1153. 

  1154.     luma_dc_quant = r->block_type == RV34_MB_P_MIX16x16 ? r->luma_dc_quant_p[s->qscale] : r->luma_dc_quant_i[s->qscale];

  1155.     if(r->is16){

  1156.         memset(block16, 0, sizeof(block16));

  1157.         rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0);

  1158.         rv34_dequant4x4_16x16(block16, rv34_qscale_tab[luma_dc_quant],rv34_qscale_tab[s->qscale]);

  1159.         rv34_inv_transform_noround(block16);

  1160.     }

  1161. 

  1162.     for(i = 0; i < 16; i++, cbp >>= 1){

  1163.         if(!r->is16 && !(cbp & 1)) continue;

  1164.         blknum = ((i & 2) >> 1) + ((i & 8) >> 2);

  1165.         blkoff = ((i & 1) << 2) + ((i & 4) << 3);

  1166.         if(cbp & 1)

  1167.             rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->luma_vlc, 0);

  1168.         rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[s->qscale],rv34_qscale_tab[s->qscale]);

  1169.         if(r->is16) //FIXME: optimize

  1170.             s->block[blknum][blkoff] = block16[(i & 3) | ((i & 0xC) << 1)];

  1171.         rv34_inv_transform(s->block[blknum] + blkoff);

  1172.     }

  1173.     if(r->block_type == RV34_MB_P_MIX16x16)

  1174.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1175.     for(; i < 24; i++, cbp >>= 1){

  1176.         if(!(cbp & 1)) continue;

  1177.         blknum = ((i & 4) >> 2) + 4;

  1178.         blkoff = ((i & 1) << 2) + ((i & 2) << 4);

  1179.         rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->chroma_vlc, 1);

  1180.         rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]],rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]]);

  1181.         rv34_inv_transform(s->block[blknum] + blkoff);

  1182.     }

  1183.     if(IS_INTRA(s->current_picture_ptr->mb_type[s->mb_x + s->mb_y*s->mb_stride]))

  1184.         rv34_output_macroblock(r, intra_types, cbp2, r->is16);

  1185.     else

  1186.         rv34_apply_differences(r, cbp2);

  1187. 

  1188.     return 0;

  1189. }

  1190. 

  1191. static int check_slice_end(RV34DecContext *r, MpegEncContext *s)

  1192. {

  1193.     int bits;

  1194.     if(s->mb_y >= s->mb_height)

  1195.         return 1;

  1196.     if(!s->mb_num_left)

  1197.         return 1;

  1198.     if(r->s.mb_skip_run > 1)

  1199.         return 0;

  1200.     bits = r->bits - get_bits_count(&s->gb);

  1201.     if(bits < 0 || (bits < 8 && !show_bits(&s->gb, bits)))

  1202.         return 1;

  1203.     return 0;

  1204. }

  1205. 

  1206. static inline int slice_compare(SliceInfo *si1, SliceInfo *si2)

  1207. {

  1208.     return si1->type   != si2->type  ||

  1209.            si1->start  >= si2->start ||

  1210.            si1->width  != si2->width ||

  1211.            si1->height != si2->height||

  1212.            si1->pts    != si2->pts;

  1213. }

  1214. 

  1215. static int rv34_decode_slice(RV34DecContext *r, int end, uint8_t* buf, int buf_size)

  1216. {

  1217.     MpegEncContext *s = &r->s;

  1218.     GetBitContext *gb = &s->gb;

  1219.     int mb_pos;

  1220.     int res;

  1221. 

  1222.     init_get_bits(&r->s.gb, buf, buf_size*8);

  1223.     res = r->parse_slice_header(r, gb, &r->si);

  1224.     if(res < 0){

  1225.         av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");

  1226.         return -1;

  1227.     }

  1228. 

  1229.     if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr==NULL) {

  1230.         if(s->width != r->si.width || s->height != r->si.height){

  1231.             av_log(s->avctx, AV_LOG_DEBUG, "Changing dimensions to %dx%d\n", r->si.width,r->si.height);

  1232.             MPV_common_end(s);

  1233.             s->width  = r->si.width;

  1234.             s->height = r->si.height;

  1235.             if(MPV_common_init(s) < 0)

  1236.                 return -1;

  1237.             r->intra_types_hist = av_realloc(r->intra_types_hist, s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1238.             r->intra_types = r->intra_types_hist + s->b4_stride * 4;

  1239.             r->mb_type = av_realloc(r->mb_type, r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));

  1240.             r->cbp_luma   = av_realloc(r->cbp_luma,   r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));

  1241.             r->cbp_chroma = av_realloc(r->cbp_chroma, r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));

  1242.             r->deblock_coefs = av_realloc(r->deblock_coefs, r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));

  1243.         }

  1244.         s->pict_type = r->si.type ? r->si.type : FF_I_TYPE;

  1245.         if(MPV_frame_start(s, s->avctx) < 0)

  1246.             return -1;

  1247.         ff_er_frame_start(s);

  1248.         r->cur_pts = r->si.pts;

  1249.         if(s->pict_type != FF_B_TYPE){

  1250.             r->last_pts = r->next_pts;

  1251.             r->next_pts = r->cur_pts;

  1252.         }

  1253.         s->mb_x = s->mb_y = 0;

  1254.     }

  1255. 

  1256.     r->si.end = end;

  1257.     s->qscale = r->si.quant;

  1258.     r->bits = buf_size*8;

  1259.     s->mb_num_left = r->si.end - r->si.start;

  1260.     r->s.mb_skip_run = 0;

  1261. 

  1262.     mb_pos = s->mb_x + s->mb_y * s->mb_width;

  1263.     if(r->si.start != mb_pos){

  1264.         av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);

  1265.         s->mb_x = r->si.start % s->mb_width;

  1266.         s->mb_y = r->si.start / s->mb_width;

  1267.     }

  1268.     memset(r->intra_types_hist, -1, s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1269.     s->first_slice_line = 1;

  1270.     s->resync_mb_x= s->mb_x;

  1271.     s->resync_mb_y= s->mb_y;

  1272. 

  1273.     ff_init_block_index(s);

  1274.     while(!check_slice_end(r, s)) {

  1275.         ff_update_block_index(s);

  1276.         s->dsp.clear_blocks(s->block[0]);

  1277. 

  1278.         if(rv34_decode_macroblock(r, r->intra_types + s->mb_x * 4 + 1) < 0){

  1279.             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);

  1280.             return -1;

  1281.         }

  1282.         if (++s->mb_x == s->mb_width) {

  1283.             s->mb_x = 0;

  1284.             s->mb_y++;

  1285.             ff_init_block_index(s);

  1286. 

  1287.             memmove(r->intra_types_hist, r->intra_types, s->b4_stride * 4 * sizeof(*r->intra_types_hist));

  1288.             memset(r->intra_types, -1, s->b4_stride * 4 * sizeof(*r->intra_types_hist));

  1289. 

  1290.             if(r->loop_filter && s->mb_y >= 2)

  1291.                 r->loop_filter(r, s->mb_y - 2);

  1292.         }

  1293.         if(s->mb_x == s->resync_mb_x)

  1294.             s->first_slice_line=0;

  1295.         s->mb_num_left--;

  1296.     }

  1297.     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);

  1298. 

  1299.     return s->mb_y == s->mb_height;

  1300. }

  1301. 

  1302. /** @} */ // recons group end

  1303. 

  1304. /**

  1305.  * Initialize decoder.

  1306.  */

  1307. av_cold int ff_rv34_decode_init(AVCodecContext *avctx)

  1308. {

  1309.     RV34DecContext *r = avctx->priv_data;

  1310.     MpegEncContext *s = &r->s;

  1311. 

  1312.     MPV_decode_defaults(s);

  1313.     s->avctx= avctx;

  1314.     s->out_format = FMT_H263;

  1315.     s->codec_id= avctx->codec_id;

  1316. 

  1317.     s->width = avctx->width;

  1318.     s->height = avctx->height;

  1319. 

  1320.     r->s.avctx = avctx;

  1321.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  1322.     r->s.flags |= CODEC_FLAG_EMU_EDGE;

  1323.     avctx->pix_fmt = PIX_FMT_YUV420P;

  1324.     avctx->has_b_frames = 1;

  1325.     s->low_delay = 0;

  1326. 

  1327.     if (MPV_common_init(s) < 0)

  1328.         return -1;

  1329. 

  1330.     ff_h264_pred_init(&r->h, CODEC_ID_RV40);

  1331. 

  1332.     r->intra_types_hist = av_malloc(s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1333.     r->intra_types = r->intra_types_hist + s->b4_stride * 4;

  1334. 

  1335.     r->mb_type = av_mallocz(r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));

  1336. 

  1337.     r->cbp_luma   = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));

  1338.     r->cbp_chroma = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));

  1339.     r->deblock_coefs = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));

  1340. 

  1341.     if(!intra_vlcs[0].cbppattern[0].bits)

  1342.         rv34_init_tables();

  1343. 

  1344.     return 0;

  1345. }

  1346. 

  1347. static int get_slice_offset(AVCodecContext *avctx, uint8_t *buf, int n)

  1348. {

  1349.     if(avctx->slice_count) return avctx->slice_offset[n];

  1350.     else                   return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) :  AV_RB32(buf + n*8);

  1351. }

  1352. 

  1353. int ff_rv34_decode_frame(AVCodecContext *avctx,

  1354.                             void *data, int *data_size,

  1355.                             const uint8_t *buf, int buf_size)

  1356. {

  1357.     RV34DecContext *r = avctx->priv_data;

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

  1359.     AVFrame *pict = data;

  1360.     SliceInfo si;

  1361.     int i;

  1362.     int slice_count;

  1363.     uint8_t *slices_hdr = NULL;

  1364.     int last = 0;

  1365. 

  1366.     /* no supplementary picture */

  1367.     if (buf_size == 0) {

  1368.         /* special case for last picture */

  1369.         if (s->low_delay==0 && s->next_picture_ptr) {

  1370.             *pict= *(AVFrame*)s->next_picture_ptr;

  1371.             s->next_picture_ptr= NULL;

  1372. 

  1373.             *data_size = sizeof(AVFrame);

  1374.         }

  1375.         return 0;

  1376.     }

  1377. 

  1378.     if(!avctx->slice_count){

  1379.         slice_count = (*buf++) + 1;

  1380.         slices_hdr = buf + 4;

  1381.         buf += 8 * slice_count;

  1382.     }else

  1383.         slice_count = avctx->slice_count;

  1384. 

  1385.     for(i=0; i<slice_count; i++){

  1386.         int offset= get_slice_offset(avctx, slices_hdr, i);

  1387.         int size;

  1388.         if(i+1 == slice_count)

  1389.             size= buf_size - offset;

  1390.         else

  1391.             size= get_slice_offset(avctx, slices_hdr, i+1) - offset;

  1392. 

  1393.         if(offset > buf_size){

  1394.             av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");

  1395.             break;

  1396.         }

  1397. 

  1398.         r->si.end = s->mb_width * s->mb_height;

  1399.         if(i+1 < slice_count){

  1400.             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);

  1401.             if(r->parse_slice_header(r, &r->s.gb, &si) < 0){

  1402.                 if(i+2 < slice_count)

  1403.                     size = get_slice_offset(avctx, slices_hdr, i+2) - offset;

  1404.                 else

  1405.                     size = buf_size - offset;

  1406.             }else

  1407.                 r->si.end = si.start;

  1408.         }

  1409.         if(!i && si.type == FF_B_TYPE && (!s->last_picture_ptr || !s->last_picture_ptr->data[0]))

  1410.             return -1;

  1411.         last = rv34_decode_slice(r, r->si.end, buf + offset, size);

  1412.         s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;

  1413.         if(last)

  1414.             break;

  1415.     }

  1416. 

  1417.     if(last){

  1418.         if(r->loop_filter)

  1419.             r->loop_filter(r, s->mb_height - 1);

  1420.         ff_er_frame_end(s);

  1421.         MPV_frame_end(s);

  1422.         if (s->pict_type == FF_B_TYPE || s->low_delay) {

  1423.             *pict= *(AVFrame*)s->current_picture_ptr;

  1424.         } else if (s->last_picture_ptr != NULL) {

  1425.             *pict= *(AVFrame*)s->last_picture_ptr;

  1426.         }

  1427. 

  1428.         if(s->last_picture_ptr || s->low_delay){

  1429.             *data_size = sizeof(AVFrame);

  1430.             ff_print_debug_info(s, pict);

  1431.         }

  1432.         s->current_picture_ptr= NULL; //so we can detect if frame_end wasnt called (find some nicer solution...)

  1433.     }

  1434.     return buf_size;

  1435. }

  1436. 

  1437. av_cold int ff_rv34_decode_end(AVCodecContext *avctx)

  1438. {

  1439.     RV34DecContext *r = avctx->priv_data;

  1440. 

  1441.     MPV_common_end(&r->s);

  1442. 

  1443.     av_freep(&r->intra_types_hist);

  1444.     r->intra_types = NULL;

  1445.     av_freep(&r->mb_type);

  1446.     av_freep(&r->cbp_luma);

  1447.     av_freep(&r->cbp_chroma);

  1448.     av_freep(&r->deblock_coefs);

  1449. 

  1450.     return 0;

  1451. }