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FFmpeg/libavcodec/rv34.c

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  1. /*

  2.  * RV30/40 decoder common data

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

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file libavcodec/rv34.c

  24.  * RV30/40 decoder common data

  25.  */

  26. 

  27. #include "avcodec.h"

  28. #include "dsputil.h"

  29. #include "mpegvideo.h"

  30. #include "golomb.h"

  31. #include "mathops.h"

  32. #include "rectangle.h"

  33. 

  34. #include "rv34vlc.h"

  35. #include "rv34data.h"

  36. #include "rv34.h"

  37. 

  38. //#define DEBUG

  39. 

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

  41. static const int rv34_mb_type_to_lavc[12] = {

  42.     MB_TYPE_INTRA,

  43.     MB_TYPE_INTRA16x16              | MB_TYPE_SEPARATE_DC,

  44.     MB_TYPE_16x16   | MB_TYPE_L0,

  45.     MB_TYPE_8x8     | MB_TYPE_L0,

  46.     MB_TYPE_16x16   | MB_TYPE_L0,

  47.     MB_TYPE_16x16   | MB_TYPE_L1,

  48.     MB_TYPE_SKIP,

  49.     MB_TYPE_DIRECT2 | MB_TYPE_16x16,

  50.     MB_TYPE_16x8    | MB_TYPE_L0,

  51.     MB_TYPE_8x16    | MB_TYPE_L0,

  52.     MB_TYPE_16x16   | MB_TYPE_L0L1,

  53.     MB_TYPE_16x16   | MB_TYPE_L0    | MB_TYPE_SEPARATE_DC

  54. };

  55. 

  56. 

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

  58. 

  59. /**

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

  61.  * @{

  62.  */

  63. 

  64. /**

  65.  * Generate VLC from codeword lengths.

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

  67.  * @param size   length of input data

  68.  * @param vlc    output VLC

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

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

  71.  */

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

  73. {

  74.     int i;

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

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

  77.     uint8_t bits2[size];

  78.     int maxbits = 0, realsize = 0;

  79. 

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

  81.         if(bits[i]){

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

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

  84.             realsize++;

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

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

  87.         }

  88.     }

  89. 

  90.     codes[0] = 0;

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

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

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

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

  95. 

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

  97.                     bits2, 1, 1,

  98.                     cw,    2, 2,

  99.                     syms,  2, 2, 0);

  100. }

  101. 

  102. /**

  103.  * Initialize all tables.

  104.  */

  105. static av_cold void rv34_init_tables(void)

  106. {

  107.     int i, j, k;

  108. 

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

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

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

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

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

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

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

  116.             }

  117.         }

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

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

  120.         }

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

  122.     }

  123. 

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

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

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

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

  128.         }

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

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

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

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

  133.         }

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

  135.     }

  136. }

  137. 

  138. /**

  139.  * Initialize all tables.

  140.  */

  141. static av_cold void rv34_free_tables(void)

  142. {

  143.     int i, j, k;

  144. 

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

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

  147.             free_vlc(&intra_vlcs[i].cbppattern[j]);

  148.             free_vlc(&intra_vlcs[i].second_pattern[j]);

  149.             free_vlc(&intra_vlcs[i].third_pattern[j]);

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

  151.                 free_vlc(&intra_vlcs[i].cbp[j][k]);

  152.             }

  153.         }

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

  155.             free_vlc(&intra_vlcs[i].first_pattern[j]);

  156.         }

  157.         free_vlc(&intra_vlcs[i].coefficient);

  158.     }

  159. 

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

  161.         free_vlc(&inter_vlcs[i].cbppattern[0]);

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

  163.             free_vlc(&inter_vlcs[i].cbp[0][j]);

  164.         }

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

  166.             free_vlc(&inter_vlcs[i].first_pattern[j]);

  167.             free_vlc(&inter_vlcs[i].second_pattern[j]);

  168.             free_vlc(&inter_vlcs[i].third_pattern[j]);

  169.         }

  170.         free_vlc(&inter_vlcs[i].coefficient);

  171.     }

  172. }

  173. 

  174. /** @} */ // vlc group

  175. 

  176. 

  177. /**

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

  179.  * @{

  180.  */

  181. 

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

  183. {

  184.     int i;

  185. 

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

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

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

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

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

  191. 

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

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

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

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

  196.     }

  197. }

  198. 

  199. /**

  200.  * Real Video 3.0/4.0 inverse transform

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

  202.  */

  203. static void rv34_inv_transform(DCTELEM *block){

  204.     int temp[16];

  205.     int i;

  206. 

  207.     rv34_row_transform(temp, block);

  208. 

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

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

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

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

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

  214. 

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

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

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

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

  219.     }

  220. 

  221. }

  222. 

  223. /**

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

  225.  *

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

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

  228.  */

  229. static void rv34_inv_transform_noround(DCTELEM *block){

  230.     int temp[16];

  231.     int i;

  232. 

  233.     rv34_row_transform(temp, block);

  234. 

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

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

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

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

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

  240. 

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

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

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

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

  245.     }

  246. 

  247. }

  248. 

  249. /** @} */ // transform

  250. 

  251. 

  252. /**

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

  254.  * @{

  255.  */

  256. 

  257. /**

  258.  * Decode coded block pattern.

  259.  */

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

  261. {

  262.     int pattern, code, cbp=0;

  263.     int ones;

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

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

  266.     const int *curshift = shifts;

  267.     int i, t, mask;

  268. 

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

  270.     pattern = code & 0xF;

  271.     code >>= 4;

  272. 

  273.     ones = rv34_count_ones[pattern];

  274. 

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

  276.         if(pattern & mask)

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

  278.     }

  279. 

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

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

  282.         if(t == 1)

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

  284.         if(t == 2)

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

  286.     }

  287.     return cbp;

  288. }

  289. 

  290. /**

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

  292.  */

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

  294. {

  295.     if(coef){

  296.         if(coef == esc){

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

  298.             if(coef > 23){

  299.                 coef -= 23;

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

  301.             }

  302.             coef += esc;

  303.         }

  304.         if(get_bits1(gb))

  305.             coef = -coef;

  306.         *dst = coef;

  307.     }

  308. }

  309. 

  310. /**

  311.  * Decode 2x2 subblock of coefficients.

  312.  */

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

  314. {

  315.     int coeffs[4];

  316. 

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

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

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

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

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

  322.     if(is_block2){

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

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

  325.     }else{

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

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

  328.     }

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

  330. }

  331. 

  332. /**

  333.  * Decode coefficients for 4x4 block.

  334.  *

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

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

  337.  *  o--o

  338.  *    /

  339.  *   /

  340.  *  o--o

  341.  */

  342. 

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

  344. {

  345.     int code, pattern;

  346. 

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

  348. 

  349.     pattern = code & 0x7;

  350. 

  351.     code >>= 3;

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

  353. 

  354.     if(pattern & 4){

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

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

  357.     }

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

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

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

  361.     }

  362.     if(pattern & 1){

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

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

  365.     }

  366. 

  367. }

  368. 

  369. /**

  370.  * Dequantize ordinary 4x4 block.

  371.  * @todo optimize

  372.  */

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

  374. {

  375.     int i, j;

  376. 

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

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

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

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

  381. }

  382. 

  383. /**

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

  385.  * @todo optimize

  386.  */

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

  388. {

  389.     int i;

  390. 

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

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

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

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

  395. }

  396. /** @} */ //block functions

  397. 

  398. 

  399. /**

  400.  * @defgroup bitstream RV30/40 bitstream parsing

  401.  * @{

  402.  */

  403. 

  404. /**

  405.  * Decode starting slice position.

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

  407.  */

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

  409. {

  410.     int i;

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

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

  413.             break;

  414.     return rv34_mb_bits_sizes[i];

  415. }

  416. 

  417. /**

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

  419.  */

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

  421. {

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

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

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

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

  426. }

  427. 

  428. /**

  429.  * Decode quantizer difference and return modified quantizer.

  430.  */

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

  432. {

  433.     if(get_bits1(gb))

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

  435.     else

  436.         return get_bits(gb, 5);

  437. }

  438. 

  439. /** @} */ //bitstream functions

  440. 

  441. /**

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

  443.  * @{

  444.  */

  445. 

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

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

  448. 

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

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

  451. 

  452. /** availability index for subblocks */

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

  454. 

  455. /**

  456.  * motion vector prediction

  457.  *

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

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

  460.  * some other vectors may be used instead.

  461.  */

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

  463. {

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

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

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

  467.     int i, j;

  468.     int mx, my;

  469.     int avail_index = avail_indexes[subblock_no];

  470.     int c_off = part_sizes_w[block_type];

  471. 

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

  473.     if(subblock_no == 3)

  474.         c_off = -1;

  475. 

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

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

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

  479.     }

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

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

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

  483.     }else{

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

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

  486.     }

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

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

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

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

  491.         }else{

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

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

  494.         }

  495.     }else{

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

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

  498.     }

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

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

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

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

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

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

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

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

  507.         }

  508.     }

  509. }

  510. 

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

  512. 

  513. /**

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

  515.  */

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

  517. {

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

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

  520.     int mul;

  521. 

  522.     if(!refdist) return 0;

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

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

  525. }

  526. 

  527. /**

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

  529.  */

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

  531.                                       int A_avail, int B_avail, int C_avail,

  532.                                       int *mx, int *my)

  533. {

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

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

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

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

  538.             *mx /= 2;

  539.             *my /= 2;

  540.         }

  541.     }else{

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

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

  544.     }

  545. }

  546. 

  547. /**

  548.  * motion vector prediction for B-frames

  549.  */

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

  551. {

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

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

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

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

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

  557.     int mx, my;

  558.     int i, j;

  559.     Picture *cur_pic = s->current_picture_ptr;

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

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

  562. 

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

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

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

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

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

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

  569.         has_A = 1;

  570.     }

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

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

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

  574.         has_B = 1;

  575.     }

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

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

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

  579.         has_C = 1;

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

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

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

  583.         has_C = 1;

  584.     }

  585. 

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

  587. 

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

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

  590. 

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

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

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

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

  595.         }

  596.     }

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

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

  599. }

  600. 

  601. /**

  602.  * motion vector prediction - RV3 version

  603.  */

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

  605. {

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

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

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

  609.     int i, j, k;

  610.     int mx, my;

  611.     int avail_index = avail_indexes[0];

  612. 

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

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

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

  616.     }

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

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

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

  620.     }else{

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

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

  623.     }

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

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

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

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

  628.         }else{

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

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

  631.         }

  632.     }else{

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

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

  635.     }

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

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

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

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

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

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

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

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

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

  645.             }

  646.         }

  647.     }

  648. }

  649. 

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

  651. 

  652. /**

  653.  * generic motion compensation function

  654.  *

  655.  * @param r decoder context

  656.  * @param block_type type of the current block

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

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

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

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

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

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

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

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

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

  666.  */

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

  668.                           const int xoff, const int yoff, int mv_off,

  669.                           const int width, const int height, int dir,

  670.                           const int thirdpel,

  671.                           qpel_mc_func (*qpel_mc)[16],

  672.                           h264_chroma_mc_func (*chroma_mc))

  673. {

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

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

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

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

  678.     int is16x16 = 1;

  679. 

  680.     if(thirdpel){

  681.         int chroma_mx, chroma_my;

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

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

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

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

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

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

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

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

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

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

  692.     }else{

  693.         int cx, cy;

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

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

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

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

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

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

  700.         umx = cx >> 2;

  701.         umy = cy >> 2;

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

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

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

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

  706.             uvmx = uvmy = 4;

  707.     }

  708.     dxy = ly*4 + lx;

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

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

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

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

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

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

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

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

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

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

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

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

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

  722. 

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

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

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

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

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

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

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

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

  731.         srcU = uvbuf;

  732.         srcV = uvbuf + 16;

  733.     }

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

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

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

  737. 

  738.     if(block_type == RV34_MB_P_16x8){

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

  740.         Y    += 8;

  741.         srcY += 8;

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

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

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

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

  746.     }

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

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

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

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

  751. }

  752. 

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

  754.                         const int xoff, const int yoff, int mv_off,

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

  756. {

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

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

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

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

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

  762. }

  763. 

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

  765. {

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

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

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

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

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

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

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

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

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

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

  776. }

  777. 

  778. static void rv34_mc_2mv_skip(RV34DecContext *r)

  779. {

  780.     int i, j;

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

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

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

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

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

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

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

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

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

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

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

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

  793.         }

  794. }

  795. 

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

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

  798. 

  799. /**

  800.  * Decode motion vector differences

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

  802.  */

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

  804. {

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

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

  807.     int i, j, k, l;

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

  809.     int next_bt;

  810. 

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

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

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

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

  815.     }

  816.     switch(block_type){

  817.     case RV34_MB_TYPE_INTRA:

  818.     case RV34_MB_TYPE_INTRA16x16:

  819.         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);

  820.         return 0;

  821.     case RV34_MB_SKIP:

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

  823.             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);

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

  825.             break;

  826.         }

  827.     case RV34_MB_B_DIRECT:

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

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

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

  831.             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);

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

  833.         }else

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

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

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

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

  838.                             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]);

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

  840.             rv34_mc_2mv(r, block_type);

  841.         else

  842.             rv34_mc_2mv_skip(r);

  843.         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);

  844.         break;

  845.     case RV34_MB_P_16x16:

  846.     case RV34_MB_P_MIX16x16:

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

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

  849.         break;

  850.     case RV34_MB_B_FORWARD:

  851.     case RV34_MB_B_BACKWARD:

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

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

  854.         if(r->rv30)

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

  856.         else

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

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

  859.         break;

  860.     case RV34_MB_P_16x8:

  861.     case RV34_MB_P_8x16:

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

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

  864.         if(block_type == RV34_MB_P_16x8){

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

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

  867.         }

  868.         if(block_type == RV34_MB_P_8x16){

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

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

  871.         }

  872.         break;

  873.     case RV34_MB_B_BIDIR:

  874.         rv34_pred_mv_b  (r, block_type, 0);

  875.         rv34_pred_mv_b  (r, block_type, 1);

  876.         rv34_mc_2mv     (r, block_type);

  877.         break;

  878.     case RV34_MB_P_8x8:

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

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

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

  882.         }

  883.         break;

  884.     }

  885. 

  886.     return 0;

  887. }

  888. /** @} */ // mv group

  889. 

  890. /**

  891.  * @defgroup recons Macroblock reconstruction functions

  892.  * @{

  893.  */

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

  895. static const int ittrans[9] = {

  896.  DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,

  897.  VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,

  898. };

  899. 

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

  901. static const int ittrans16[4] = {

  902.  DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,

  903. };

  904. 

  905. /**

  906.  * Perform 4x4 intra prediction.

  907.  */

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

  909. {

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

  911.     uint32_t topleft;

  912. 

  913.     if(!up && !left)

  914.         itype = DC_128_PRED;

  915.     else if(!up){

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

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

  918.     }else if(!left){

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

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

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

  922.     }

  923.     if(!down){

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

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

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

  927.     }

  928.     if(!right && up){

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

  930.         prev = (uint8_t*)&topleft;

  931.     }

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

  933. }

  934. 

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

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

  937. {

  938.     int x, y;

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

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

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

  942. }

  943. 

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

  945. {

  946.     if(!up && !left)

  947.         itype = DC_128_PRED8x8;

  948.     else if(!up){

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

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

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

  952.     }else if(!left){

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

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

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

  956.     }

  957.     return itype;

  958. }

  959. 

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

  961. {

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

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

  964.     int i, j;

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

  966.     int itype;

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

  968.     int idx;

  969. 

  970.     // Set neighbour information.

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

  972.         avail[0] = 1;

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

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

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

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

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

  978.         avail[5] = 1;

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

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

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

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

  983. 

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

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

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

  987.     if(!is16){

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

  989.             idx = 9 + j*8;

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

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

  992.                 avail[idx] = 1;

  993.                 if(cbp & 1)

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

  995.             }

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

  997.             intra_types += s->b4_stride;

  998.         }

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

  1000.         fill_rectangle(r->avail_cache + 5, 2, 2, 4, 0, 4);

  1001.         for(j = 0; j < 2; j++){

  1002.             idx = 5 + j*4;

  1003.             for(i = 0; i < 2; i++, cbp >>= 1, idx++){

  1004.                 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]);

  1005.                 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]);

  1006.                 r->avail_cache[idx] = 1;

  1007.                 if(cbp & 0x01)

  1008.                     rv34_add_4x4_block(U + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[4], i*4+j*32);

  1009.                 if(cbp & 0x10)

  1010.                     rv34_add_4x4_block(V + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[5], i*4+j*32);

  1011.             }

  1012.         }

  1013.     }else{

  1014.         itype = ittrans16[intra_types[0]];

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

  1016.         r->h.pred16x16[itype](Y, s->linesize);

  1017.         dsp->add_pixels_clamped(s->block[0], Y,     s->linesize);

  1018.         dsp->add_pixels_clamped(s->block[1], Y + 8, s->linesize);

  1019.         Y += s->linesize * 8;

  1020.         dsp->add_pixels_clamped(s->block[2], Y,     s->linesize);

  1021.         dsp->add_pixels_clamped(s->block[3], Y + 8, s->linesize);

  1022. 

  1023.         itype = ittrans16[intra_types[0]];

  1024.         if(itype == PLANE_PRED8x8) itype = DC_PRED8x8;

  1025.         itype = adjust_pred16(itype, r->avail_cache[5-4], r->avail_cache[5-1]);

  1026.         r->h.pred8x8[itype](U, s->uvlinesize);

  1027.         dsp->add_pixels_clamped(s->block[4], U, s->uvlinesize);

  1028.         r->h.pred8x8[itype](V, s->uvlinesize);

  1029.         dsp->add_pixels_clamped(s->block[5], V, s->uvlinesize);

  1030.     }

  1031. }

  1032. 

  1033. /** @} */ // recons group

  1034. 

  1035. /**

  1036.  * @addtogroup bitstream

  1037.  * Decode macroblock header and return CBP in case of success, -1 otherwise.

  1038.  */

  1039. static int rv34_decode_mb_header(RV34DecContext *r, int8_t *intra_types)

  1040. {

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

  1042.     GetBitContext *gb = &s->gb;

  1043.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1044.     int i, t;

  1045. 

  1046.     if(!r->si.type){

  1047.         r->is16 = get_bits1(gb);

  1048.         if(!r->is16 && !r->rv30){

  1049.             if(!get_bits1(gb))

  1050.                 av_log(s->avctx, AV_LOG_ERROR, "Need DQUANT\n");

  1051.         }

  1052.         s->current_picture_ptr->mb_type[mb_pos] = r->is16 ? MB_TYPE_INTRA16x16 : MB_TYPE_INTRA;

  1053.         r->block_type = r->is16 ? RV34_MB_TYPE_INTRA16x16 : RV34_MB_TYPE_INTRA;

  1054.     }else{

  1055.         r->block_type = r->decode_mb_info(r);

  1056.         if(r->block_type == -1)

  1057.             return -1;

  1058.         s->current_picture_ptr->mb_type[mb_pos] = rv34_mb_type_to_lavc[r->block_type];

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

  1060.         if(r->block_type == RV34_MB_SKIP){

  1061.             if(s->pict_type == FF_P_TYPE)

  1062.                 r->mb_type[mb_pos] = RV34_MB_P_16x16;

  1063.             if(s->pict_type == FF_B_TYPE)

  1064.                 r->mb_type[mb_pos] = RV34_MB_B_DIRECT;

  1065.         }

  1066.         r->is16 = !!IS_INTRA16x16(s->current_picture_ptr->mb_type[mb_pos]);

  1067.         rv34_decode_mv(r, r->block_type);

  1068.         if(r->block_type == RV34_MB_SKIP){

  1069.             fill_rectangle(intra_types, 4, 4, s->b4_stride, 0, sizeof(intra_types[0]));

  1070.             return 0;

  1071.         }

  1072.         r->chroma_vlc = 1;

  1073.         r->luma_vlc   = 0;

  1074.     }

  1075.     if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){

  1076.         if(r->is16){

  1077.             t = get_bits(gb, 2);

  1078.             fill_rectangle(intra_types, 4, 4, s->b4_stride, t, sizeof(intra_types[0]));

  1079.             r->luma_vlc   = 2;

  1080.         }else{

  1081.             if(r->decode_intra_types(r, gb, intra_types) < 0)

  1082.                 return -1;

  1083.             r->luma_vlc   = 1;

  1084.         }

  1085.         r->chroma_vlc = 0;

  1086.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);

  1087.     }else{

  1088.         for(i = 0; i < 16; i++)

  1089.             intra_types[(i & 3) + (i>>2) * s->b4_stride] = 0;

  1090.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1091.         if(r->mb_type[mb_pos] == RV34_MB_P_MIX16x16){

  1092.             r->is16 = 1;

  1093.             r->chroma_vlc = 1;

  1094.             r->luma_vlc   = 2;

  1095.             r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);

  1096.         }

  1097.     }

  1098. 

  1099.     return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);

  1100. }

  1101. 

  1102. /**

  1103.  * @addtogroup recons

  1104.  * @{

  1105.  */

  1106. /**

  1107.  * mask for retrieving all bits in coded block pattern

  1108.  * corresponding to one 8x8 block

  1109.  */

  1110. #define LUMA_CBP_BLOCK_MASK 0x33

  1111. 

  1112. #define U_CBP_MASK 0x0F0000

  1113. #define V_CBP_MASK 0xF00000

  1114. 

  1115. 

  1116. static void rv34_apply_differences(RV34DecContext *r, int cbp)

  1117. {

  1118.     static const int shifts[4] = { 0, 2, 8, 10 };

  1119.     MpegEncContext *s = &r->s;

  1120.     int i;

  1121. 

  1122.     for(i = 0; i < 4; i++)

  1123.         if((cbp & (LUMA_CBP_BLOCK_MASK << shifts[i])) || r->block_type == RV34_MB_P_MIX16x16)

  1124.             s->dsp.add_pixels_clamped(s->block[i], s->dest[0] + (i & 1)*8 + (i&2)*4*s->linesize, s->linesize);

  1125.     if(cbp & U_CBP_MASK)

  1126.         s->dsp.add_pixels_clamped(s->block[4], s->dest[1], s->uvlinesize);

  1127.     if(cbp & V_CBP_MASK)

  1128.         s->dsp.add_pixels_clamped(s->block[5], s->dest[2], s->uvlinesize);

  1129. }

  1130. 

  1131. static int is_mv_diff_gt_3(int16_t (*motion_val)[2], int step)

  1132. {

  1133.     int d;

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

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

  1136.         return 1;

  1137.     d = motion_val[0][1] - motion_val[-step][1];

  1138.     if(d < -3 || d > 3)

  1139.         return 1;

  1140.     return 0;

  1141. }

  1142. 

  1143. static int rv34_set_deblock_coef(RV34DecContext *r)

  1144. {

  1145.     MpegEncContext *s = &r->s;

  1146.     int hmvmask = 0, vmvmask = 0, i, j;

  1147.     int midx = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;

  1148.     int16_t (*motion_val)[2] = s->current_picture_ptr->motion_val[0][midx];

  1149.     for(j = 0; j < 16; j += 8){

  1150.         for(i = 0; i < 2; i++){

  1151.             if(is_mv_diff_gt_3(motion_val + i, 1))

  1152.                 vmvmask |= 0x11 << (j + i*2);

  1153.             if((j || s->mb_y) && is_mv_diff_gt_3(motion_val + i, s->b8_stride))

  1154.                 hmvmask |= 0x03 << (j + i*2);

  1155.         }

  1156.         motion_val += s->b8_stride;

  1157.     }

  1158.     if(s->first_slice_line)

  1159.         hmvmask &= ~0x000F;

  1160.     if(!s->mb_x)

  1161.         vmvmask &= ~0x1111;

  1162.     if(r->rv30){ //RV30 marks both subblocks on the edge for filtering

  1163.         vmvmask |= (vmvmask & 0x4444) >> 1;

  1164.         hmvmask |= (hmvmask & 0x0F00) >> 4;

  1165.         if(s->mb_x)

  1166.             r->deblock_coefs[s->mb_x - 1 + s->mb_y*s->mb_stride] |= (vmvmask & 0x1111) << 3;

  1167.         if(!s->first_slice_line)

  1168.             r->deblock_coefs[s->mb_x + (s->mb_y - 1)*s->mb_stride] |= (hmvmask & 0xF) << 12;

  1169.     }

  1170.     return hmvmask | vmvmask;

  1171. }

  1172. 

  1173. static int rv34_decode_macroblock(RV34DecContext *r, int8_t *intra_types)

  1174. {

  1175.     MpegEncContext *s = &r->s;

  1176.     GetBitContext *gb = &s->gb;

  1177.     int cbp, cbp2;

  1178.     int i, blknum, blkoff;

  1179.     DCTELEM block16[64];

  1180.     int luma_dc_quant;

  1181.     int dist;

  1182.     int mb_pos = s->mb_x + s->mb_y * s->mb_stride;

  1183. 

  1184.     // Calculate which neighbours are available. Maybe it's worth optimizing too.

  1185.     memset(r->avail_cache, 0, sizeof(r->avail_cache));

  1186.     fill_rectangle(r->avail_cache + 5, 2, 2, 4, 1, 4);

  1187.     dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;

  1188.     if(s->mb_x && dist)

  1189.         r->avail_cache[4] =

  1190.         r->avail_cache[8] = s->current_picture_ptr->mb_type[mb_pos - 1];

  1191.     if(dist >= s->mb_width)

  1192.         r->avail_cache[1] =

  1193.         r->avail_cache[2] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];

  1194.     if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)

  1195.         r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];

  1196.     if(s->mb_x && dist > s->mb_width)

  1197.         r->avail_cache[0] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];

  1198. 

  1199.     s->qscale = r->si.quant;

  1200.     cbp = cbp2 = rv34_decode_mb_header(r, intra_types);

  1201.     r->cbp_luma  [mb_pos] = cbp;

  1202.     r->cbp_chroma[mb_pos] = cbp >> 16;

  1203.     if(s->pict_type == FF_I_TYPE)

  1204.         r->deblock_coefs[mb_pos] = 0xFFFF;

  1205.     else

  1206.         r->deblock_coefs[mb_pos] = rv34_set_deblock_coef(r) | r->cbp_luma[mb_pos];

  1207.     s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;

  1208. 

  1209.     if(cbp == -1)

  1210.         return -1;

  1211. 

  1212.     luma_dc_quant = r->block_type == RV34_MB_P_MIX16x16 ? r->luma_dc_quant_p[s->qscale] : r->luma_dc_quant_i[s->qscale];

  1213.     if(r->is16){

  1214.         memset(block16, 0, sizeof(block16));

  1215.         rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0);

  1216.         rv34_dequant4x4_16x16(block16, rv34_qscale_tab[luma_dc_quant],rv34_qscale_tab[s->qscale]);

  1217.         rv34_inv_transform_noround(block16);

  1218.     }

  1219. 

  1220.     for(i = 0; i < 16; i++, cbp >>= 1){

  1221.         if(!r->is16 && !(cbp & 1)) continue;

  1222.         blknum = ((i & 2) >> 1) + ((i & 8) >> 2);

  1223.         blkoff = ((i & 1) << 2) + ((i & 4) << 3);

  1224.         if(cbp & 1)

  1225.             rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->luma_vlc, 0);

  1226.         rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[s->qscale],rv34_qscale_tab[s->qscale]);

  1227.         if(r->is16) //FIXME: optimize

  1228.             s->block[blknum][blkoff] = block16[(i & 3) | ((i & 0xC) << 1)];

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

  1230.     }

  1231.     if(r->block_type == RV34_MB_P_MIX16x16)

  1232.         r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);

  1233.     for(; i < 24; i++, cbp >>= 1){

  1234.         if(!(cbp & 1)) continue;

  1235.         blknum = ((i & 4) >> 2) + 4;

  1236.         blkoff = ((i & 1) << 2) + ((i & 2) << 4);

  1237.         rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->chroma_vlc, 1);

  1238.         rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]],rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]]);

  1239.         rv34_inv_transform(s->block[blknum] + blkoff);

  1240.     }

  1241.     if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos]))

  1242.         rv34_output_macroblock(r, intra_types, cbp2, r->is16);

  1243.     else

  1244.         rv34_apply_differences(r, cbp2);

  1245. 

  1246.     return 0;

  1247. }

  1248. 

  1249. static int check_slice_end(RV34DecContext *r, MpegEncContext *s)

  1250. {

  1251.     int bits;

  1252.     if(s->mb_y >= s->mb_height)

  1253.         return 1;

  1254.     if(!s->mb_num_left)

  1255.         return 1;

  1256.     if(r->s.mb_skip_run > 1)

  1257.         return 0;

  1258.     bits = r->bits - get_bits_count(&s->gb);

  1259.     if(bits < 0 || (bits < 8 && !show_bits(&s->gb, bits)))

  1260.         return 1;

  1261.     return 0;

  1262. }

  1263. 

  1264. static inline int slice_compare(SliceInfo *si1, SliceInfo *si2)

  1265. {

  1266.     return si1->type   != si2->type  ||

  1267.            si1->start  >= si2->start ||

  1268.            si1->width  != si2->width ||

  1269.            si1->height != si2->height||

  1270.            si1->pts    != si2->pts;

  1271. }

  1272. 

  1273. static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int buf_size)

  1274. {

  1275.     MpegEncContext *s = &r->s;

  1276.     GetBitContext *gb = &s->gb;

  1277.     int mb_pos;

  1278.     int res;

  1279. 

  1280.     init_get_bits(&r->s.gb, buf, buf_size*8);

  1281.     res = r->parse_slice_header(r, gb, &r->si);

  1282.     if(res < 0){

  1283.         av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");

  1284.         return -1;

  1285.     }

  1286. 

  1287.     if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr==NULL) {

  1288.         if(s->width != r->si.width || s->height != r->si.height){

  1289.             av_log(s->avctx, AV_LOG_DEBUG, "Changing dimensions to %dx%d\n", r->si.width,r->si.height);

  1290.             MPV_common_end(s);

  1291.             s->width  = r->si.width;

  1292.             s->height = r->si.height;

  1293.             if(MPV_common_init(s) < 0)

  1294.                 return -1;

  1295.             r->intra_types_hist = av_realloc(r->intra_types_hist, s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1296.             r->intra_types = r->intra_types_hist + s->b4_stride * 4;

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

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

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

  1300.             r->deblock_coefs = av_realloc(r->deblock_coefs, r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));

  1301.         }

  1302.         s->pict_type = r->si.type ? r->si.type : FF_I_TYPE;

  1303.         if(MPV_frame_start(s, s->avctx) < 0)

  1304.             return -1;

  1305.         ff_er_frame_start(s);

  1306.         r->cur_pts = r->si.pts;

  1307.         if(s->pict_type != FF_B_TYPE){

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

  1309.             r->next_pts = r->cur_pts;

  1310.         }

  1311.         s->mb_x = s->mb_y = 0;

  1312.     }

  1313. 

  1314.     r->si.end = end;

  1315.     s->qscale = r->si.quant;

  1316.     r->bits = buf_size*8;

  1317.     s->mb_num_left = r->si.end - r->si.start;

  1318.     r->s.mb_skip_run = 0;

  1319. 

  1320.     mb_pos = s->mb_x + s->mb_y * s->mb_width;

  1321.     if(r->si.start != mb_pos){

  1322.         av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);

  1323.         s->mb_x = r->si.start % s->mb_width;

  1324.         s->mb_y = r->si.start / s->mb_width;

  1325.     }

  1326.     memset(r->intra_types_hist, -1, s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1327.     s->first_slice_line = 1;

  1328.     s->resync_mb_x= s->mb_x;

  1329.     s->resync_mb_y= s->mb_y;

  1330. 

  1331.     ff_init_block_index(s);

  1332.     while(!check_slice_end(r, s)) {

  1333.         ff_update_block_index(s);

  1334.         s->dsp.clear_blocks(s->block[0]);

  1335. 

  1336.         if(rv34_decode_macroblock(r, r->intra_types + s->mb_x * 4 + 1) < 0){

  1337.             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);

  1338.             return -1;

  1339.         }

  1340.         if (++s->mb_x == s->mb_width) {

  1341.             s->mb_x = 0;

  1342.             s->mb_y++;

  1343.             ff_init_block_index(s);

  1344. 

  1345.             memmove(r->intra_types_hist, r->intra_types, s->b4_stride * 4 * sizeof(*r->intra_types_hist));

  1346.             memset(r->intra_types, -1, s->b4_stride * 4 * sizeof(*r->intra_types_hist));

  1347. 

  1348.             if(r->loop_filter && s->mb_y >= 2)

  1349.                 r->loop_filter(r, s->mb_y - 2);

  1350.         }

  1351.         if(s->mb_x == s->resync_mb_x)

  1352.             s->first_slice_line=0;

  1353.         s->mb_num_left--;

  1354.     }

  1355.     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);

  1356. 

  1357.     return s->mb_y == s->mb_height;

  1358. }

  1359. 

  1360. /** @} */ // recons group end

  1361. 

  1362. /**

  1363.  * Initialize decoder.

  1364.  */

  1365. av_cold int ff_rv34_decode_init(AVCodecContext *avctx)

  1366. {

  1367.     RV34DecContext *r = avctx->priv_data;

  1368.     MpegEncContext *s = &r->s;

  1369. 

  1370.     MPV_decode_defaults(s);

  1371.     s->avctx= avctx;

  1372.     s->out_format = FMT_H263;

  1373.     s->codec_id= avctx->codec_id;

  1374. 

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

  1376.     s->height = avctx->height;

  1377. 

  1378.     r->s.avctx = avctx;

  1379.     avctx->flags |= CODEC_FLAG_EMU_EDGE;

  1380.     r->s.flags |= CODEC_FLAG_EMU_EDGE;

  1381.     avctx->pix_fmt = PIX_FMT_YUV420P;

  1382.     avctx->has_b_frames = 1;

  1383.     s->low_delay = 0;

  1384. 

  1385.     if (MPV_common_init(s) < 0)

  1386.         return -1;

  1387. 

  1388.     ff_h264_pred_init(&r->h, CODEC_ID_RV40);

  1389. 

  1390.     r->intra_types_hist = av_malloc(s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));

  1391.     r->intra_types = r->intra_types_hist + s->b4_stride * 4;

  1392. 

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

  1394. 

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

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

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

  1398. 

  1399.     rv34_init_tables();

  1400. 

  1401.     return 0;

  1402. }

  1403. 

  1404. static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)

  1405. {

  1406.     if(avctx->slice_count) return avctx->slice_offset[n];

  1407.     else                   return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) :  AV_RB32(buf + n*8);

  1408. }

  1409. 

  1410. int ff_rv34_decode_frame(AVCodecContext *avctx,

  1411.                             void *data, int *data_size,

  1412.                             AVPacket *avpkt)

  1413. {

  1414.     const uint8_t *buf = avpkt->data;

  1415.     int buf_size = avpkt->size;

  1416.     RV34DecContext *r = avctx->priv_data;

  1417.     MpegEncContext *s = &r->s;

  1418.     AVFrame *pict = data;

  1419.     SliceInfo si;

  1420.     int i;

  1421.     int slice_count;

  1422.     const uint8_t *slices_hdr = NULL;

  1423.     int last = 0;

  1424. 

  1425.     /* no supplementary picture */

  1426.     if (buf_size == 0) {

  1427.         /* special case for last picture */

  1428.         if (s->low_delay==0 && s->next_picture_ptr) {

  1429.             *pict= *(AVFrame*)s->next_picture_ptr;

  1430.             s->next_picture_ptr= NULL;

  1431. 

  1432.             *data_size = sizeof(AVFrame);

  1433.         }

  1434.         return 0;

  1435.     }

  1436. 

  1437.     if(!avctx->slice_count){

  1438.         slice_count = (*buf++) + 1;

  1439.         slices_hdr = buf + 4;

  1440.         buf += 8 * slice_count;

  1441.     }else

  1442.         slice_count = avctx->slice_count;

  1443. 

  1444.     //parse first slice header to check whether this frame can be decoded

  1445.     if(get_slice_offset(avctx, slices_hdr, 0) > buf_size){

  1446.         av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");

  1447.         return -1;

  1448.     }

  1449.     init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), buf_size-get_slice_offset(avctx, slices_hdr, 0));

  1450.     if(r->parse_slice_header(r, &r->s.gb, &si) < 0 || si.start){

  1451.         av_log(avctx, AV_LOG_ERROR, "First slice header is incorrect\n");

  1452.         return -1;

  1453.     }

  1454.     if((!s->last_picture_ptr || !s->last_picture_ptr->data[0]) && si.type == FF_B_TYPE)

  1455.         return -1;

  1456.     /* skip b frames if we are in a hurry */

  1457.     if(avctx->hurry_up && si.type==FF_B_TYPE) return buf_size;

  1458.     if(   (avctx->skip_frame >= AVDISCARD_NONREF && si.type==FF_B_TYPE)

  1459.        || (avctx->skip_frame >= AVDISCARD_NONKEY && si.type!=FF_I_TYPE)

  1460.        ||  avctx->skip_frame >= AVDISCARD_ALL)

  1461.         return buf_size;

  1462.     /* skip everything if we are in a hurry>=5 */

  1463.     if(avctx->hurry_up>=5)

  1464.         return buf_size;

  1465. 

  1466.     for(i=0; i<slice_count; i++){

  1467.         int offset= get_slice_offset(avctx, slices_hdr, i);

  1468.         int size;

  1469.         if(i+1 == slice_count)

  1470.             size= buf_size - offset;

  1471.         else

  1472.             size= get_slice_offset(avctx, slices_hdr, i+1) - offset;

  1473. 

  1474.         if(offset > buf_size){

  1475.             av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");

  1476.             break;

  1477.         }

  1478. 

  1479.         r->si.end = s->mb_width * s->mb_height;

  1480.         if(i+1 < slice_count){

  1481.             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);

  1482.             if(r->parse_slice_header(r, &r->s.gb, &si) < 0){

  1483.                 if(i+2 < slice_count)

  1484.                     size = get_slice_offset(avctx, slices_hdr, i+2) - offset;

  1485.                 else

  1486.                     size = buf_size - offset;

  1487.             }else

  1488.                 r->si.end = si.start;

  1489.         }

  1490.         last = rv34_decode_slice(r, r->si.end, buf + offset, size);

  1491.         s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;

  1492.         if(last)

  1493.             break;

  1494.     }

  1495. 

  1496.     if(last){

  1497.         if(r->loop_filter)

  1498.             r->loop_filter(r, s->mb_height - 1);

  1499.         ff_er_frame_end(s);

  1500.         MPV_frame_end(s);

  1501.         if (s->pict_type == FF_B_TYPE || s->low_delay) {

  1502.             *pict= *(AVFrame*)s->current_picture_ptr;

  1503.         } else if (s->last_picture_ptr != NULL) {

  1504.             *pict= *(AVFrame*)s->last_picture_ptr;

  1505.         }

  1506. 

  1507.         if(s->last_picture_ptr || s->low_delay){

  1508.             *data_size = sizeof(AVFrame);

  1509.             ff_print_debug_info(s, pict);

  1510.         }

  1511.         s->current_picture_ptr= NULL; //so we can detect if frame_end wasnt called (find some nicer solution...)

  1512.     }

  1513.     return buf_size;

  1514. }

  1515. 

  1516. av_cold int ff_rv34_decode_end(AVCodecContext *avctx)

  1517. {

  1518.     RV34DecContext *r = avctx->priv_data;

  1519. 

  1520.     MPV_common_end(&r->s);

  1521.     rv34_free_tables();

  1522. 

  1523.     av_freep(&r->intra_types_hist);

  1524.     r->intra_types = NULL;

  1525.     av_freep(&r->mb_type);

  1526.     av_freep(&r->cbp_luma);

  1527.     av_freep(&r->cbp_chroma);

  1528.     av_freep(&r->deblock_coefs);

  1529. 

  1530.     return 0;

  1531. }