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FFmpeg/libavcodec/vp56.c

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  1. /*

  2.  * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. /**

  22.  * @file

  23.  * VP5 and VP6 compatible video decoder (common features)

  24.  */

  25. 

  26. #include "avcodec.h"

  27. #include "bytestream.h"

  28. #include "internal.h"

  29. #include "h264chroma.h"

  30. #include "vp56.h"

  31. #include "vp56data.h"

  32. 

  33. 

  34. void ff_vp56_init_dequant(VP56Context *s, int quantizer)

  35. {

  36.     if (s->quantizer != quantizer)

  37.         ff_vp3dsp_set_bounding_values(s->bounding_values_array, ff_vp56_filter_threshold[quantizer]);

  38.     s->quantizer = quantizer;

  39.     s->dequant_dc = ff_vp56_dc_dequant[quantizer] << 2;

  40.     s->dequant_ac = ff_vp56_ac_dequant[quantizer] << 2;

  41. }

  42. 

  43. static int vp56_get_vectors_predictors(VP56Context *s, int row, int col,

  44.                                        VP56Frame ref_frame)

  45. {

  46.     int nb_pred = 0;

  47.     VP56mv vect[2] = {{0,0}, {0,0}};

  48.     int pos, offset;

  49.     VP56mv mvp;

  50. 

  51.     for (pos=0; pos<12; pos++) {

  52.         mvp.x = col + ff_vp56_candidate_predictor_pos[pos][0];

  53.         mvp.y = row + ff_vp56_candidate_predictor_pos[pos][1];

  54.         if (mvp.x < 0 || mvp.x >= s->mb_width ||

  55.             mvp.y < 0 || mvp.y >= s->mb_height)

  56.             continue;

  57.         offset = mvp.x + s->mb_width*mvp.y;

  58. 

  59.         if (ff_vp56_reference_frame[s->macroblocks[offset].type] != ref_frame)

  60.             continue;

  61.         if ((s->macroblocks[offset].mv.x == vect[0].x &&

  62.              s->macroblocks[offset].mv.y == vect[0].y) ||

  63.             (s->macroblocks[offset].mv.x == 0 &&

  64.              s->macroblocks[offset].mv.y == 0))

  65.             continue;

  66. 

  67.         vect[nb_pred++] = s->macroblocks[offset].mv;

  68.         if (nb_pred > 1) {

  69.             nb_pred = -1;

  70.             break;

  71.         }

  72.         s->vector_candidate_pos = pos;

  73.     }

  74. 

  75.     s->vector_candidate[0] = vect[0];

  76.     s->vector_candidate[1] = vect[1];

  77. 

  78.     return nb_pred+1;

  79. }

  80. 

  81. static void vp56_parse_mb_type_models(VP56Context *s)

  82. {

  83.     VP56RangeCoder *c = &s->c;

  84.     VP56Model *model = s->modelp;

  85.     int i, ctx, type;

  86. 

  87.     for (ctx=0; ctx<3; ctx++) {

  88.         if (vp56_rac_get_prob_branchy(c, 174)) {

  89.             int idx = vp56_rac_gets(c, 4);

  90.             memcpy(model->mb_types_stats[ctx],

  91.                    ff_vp56_pre_def_mb_type_stats[idx][ctx],

  92.                    sizeof(model->mb_types_stats[ctx]));

  93.         }

  94.         if (vp56_rac_get_prob_branchy(c, 254)) {

  95.             for (type=0; type<10; type++) {

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

  97.                     if (vp56_rac_get_prob_branchy(c, 205)) {

  98.                         int delta, sign = vp56_rac_get(c);

  99. 

  100.                         delta = vp56_rac_get_tree(c, ff_vp56_pmbtm_tree,

  101.                                                   ff_vp56_mb_type_model_model);

  102.                         if (!delta)

  103.                             delta = 4 * vp56_rac_gets(c, 7);

  104.                         model->mb_types_stats[ctx][type][i] += (delta ^ -sign) + sign;

  105.                     }

  106.                 }

  107.             }

  108.         }

  109.     }

  110. 

  111.     /* compute MB type probability tables based on previous MB type */

  112.     for (ctx=0; ctx<3; ctx++) {

  113.         int p[10];

  114. 

  115.         for (type=0; type<10; type++)

  116.             p[type] = 100 * model->mb_types_stats[ctx][type][1];

  117. 

  118.         for (type=0; type<10; type++) {

  119.             int p02, p34, p0234, p17, p56, p89, p5689, p156789;

  120. 

  121.             /* conservative MB type probability */

  122.             model->mb_type[ctx][type][0] = 255 - (255 * model->mb_types_stats[ctx][type][0]) / (1 + model->mb_types_stats[ctx][type][0] + model->mb_types_stats[ctx][type][1]);

  123. 

  124.             p[type] = 0;    /* same MB type => weight is null */

  125. 

  126.             /* binary tree parsing probabilities */

  127.             p02 = p[0] + p[2];

  128.             p34 = p[3] + p[4];

  129.             p0234 = p02 + p34;

  130.             p17 = p[1] + p[7];

  131.             p56 = p[5] + p[6];

  132.             p89 = p[8] + p[9];

  133.             p5689 = p56 + p89;

  134.             p156789 = p17 + p5689;

  135. 

  136.             model->mb_type[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);

  137.             model->mb_type[ctx][type][2] = 1 + 255 * p02  / (1+p0234);

  138.             model->mb_type[ctx][type][3] = 1 + 255 * p17  / (1+p156789);

  139.             model->mb_type[ctx][type][4] = 1 + 255 * p[0] / (1+p02);

  140.             model->mb_type[ctx][type][5] = 1 + 255 * p[3] / (1+p34);

  141.             model->mb_type[ctx][type][6] = 1 + 255 * p[1] / (1+p17);

  142.             model->mb_type[ctx][type][7] = 1 + 255 * p56  / (1+p5689);

  143.             model->mb_type[ctx][type][8] = 1 + 255 * p[5] / (1+p56);

  144.             model->mb_type[ctx][type][9] = 1 + 255 * p[8] / (1+p89);

  145. 

  146.             /* restore initial value */

  147.             p[type] = 100 * model->mb_types_stats[ctx][type][1];

  148.         }

  149.     }

  150. }

  151. 

  152. static VP56mb vp56_parse_mb_type(VP56Context *s,

  153.                                  VP56mb prev_type, int ctx)

  154. {

  155.     uint8_t *mb_type_model = s->modelp->mb_type[ctx][prev_type];

  156.     VP56RangeCoder *c = &s->c;

  157. 

  158.     if (vp56_rac_get_prob_branchy(c, mb_type_model[0]))

  159.         return prev_type;

  160.     else

  161.         return vp56_rac_get_tree(c, ff_vp56_pmbt_tree, mb_type_model);

  162. }

  163. 

  164. static void vp56_decode_4mv(VP56Context *s, int row, int col)

  165. {

  166.     VP56mv mv = {0,0};

  167.     int type[4];

  168.     int b;

  169. 

  170.     /* parse each block type */

  171.     for (b=0; b<4; b++) {

  172.         type[b] = vp56_rac_gets(&s->c, 2);

  173.         if (type[b])

  174.             type[b]++;  /* only returns 0, 2, 3 or 4 (all INTER_PF) */

  175.     }

  176. 

  177.     /* get vectors */

  178.     for (b=0; b<4; b++) {

  179.         switch (type[b]) {

  180.             case VP56_MB_INTER_NOVEC_PF:

  181.                 s->mv[b] = (VP56mv) {0,0};

  182.                 break;

  183.             case VP56_MB_INTER_DELTA_PF:

  184.                 s->parse_vector_adjustment(s, &s->mv[b]);

  185.                 break;

  186.             case VP56_MB_INTER_V1_PF:

  187.                 s->mv[b] = s->vector_candidate[0];

  188.                 break;

  189.             case VP56_MB_INTER_V2_PF:

  190.                 s->mv[b] = s->vector_candidate[1];

  191.                 break;

  192.         }

  193.         mv.x += s->mv[b].x;

  194.         mv.y += s->mv[b].y;

  195.     }

  196. 

  197.     /* this is the one selected for the whole MB for prediction */

  198.     s->macroblocks[row * s->mb_width + col].mv = s->mv[3];

  199. 

  200.     /* chroma vectors are average luma vectors */

  201.     s->mv[4].x = s->mv[5].x = RSHIFT(mv.x,2);

  202.     s->mv[4].y = s->mv[5].y = RSHIFT(mv.y,2);

  203. }

  204. 

  205. static VP56mb vp56_decode_mv(VP56Context *s, int row, int col)

  206. {

  207.     VP56mv *mv, vect = {0,0};

  208.     int ctx, b;

  209. 

  210.     ctx = vp56_get_vectors_predictors(s, row, col, VP56_FRAME_PREVIOUS);

  211.     s->mb_type = vp56_parse_mb_type(s, s->mb_type, ctx);

  212.     s->macroblocks[row * s->mb_width + col].type = s->mb_type;

  213. 

  214.     switch (s->mb_type) {

  215.         case VP56_MB_INTER_V1_PF:

  216.             mv = &s->vector_candidate[0];

  217.             break;

  218. 

  219.         case VP56_MB_INTER_V2_PF:

  220.             mv = &s->vector_candidate[1];

  221.             break;

  222. 

  223.         case VP56_MB_INTER_V1_GF:

  224.             vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);

  225.             mv = &s->vector_candidate[0];

  226.             break;

  227. 

  228.         case VP56_MB_INTER_V2_GF:

  229.             vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);

  230.             mv = &s->vector_candidate[1];

  231.             break;

  232. 

  233.         case VP56_MB_INTER_DELTA_PF:

  234.             s->parse_vector_adjustment(s, &vect);

  235.             mv = &vect;

  236.             break;

  237. 

  238.         case VP56_MB_INTER_DELTA_GF:

  239.             vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);

  240.             s->parse_vector_adjustment(s, &vect);

  241.             mv = &vect;

  242.             break;

  243. 

  244.         case VP56_MB_INTER_4V:

  245.             vp56_decode_4mv(s, row, col);

  246.             return s->mb_type;

  247. 

  248.         default:

  249.             mv = &vect;

  250.             break;

  251.     }

  252. 

  253.     s->macroblocks[row*s->mb_width + col].mv = *mv;

  254. 

  255.     /* same vector for all blocks */

  256.     for (b=0; b<6; b++)

  257.         s->mv[b] = *mv;

  258. 

  259.     return s->mb_type;

  260. }

  261. 

  262. static VP56mb vp56_conceal_mv(VP56Context *s, int row, int col)

  263. {

  264.     VP56mv *mv, vect = {0,0};

  265.     int b;

  266. 

  267.     s->mb_type = VP56_MB_INTER_NOVEC_PF;

  268.     s->macroblocks[row * s->mb_width + col].type = s->mb_type;

  269. 

  270.     mv = &vect;

  271. 

  272.     s->macroblocks[row*s->mb_width + col].mv = *mv;

  273. 

  274.     /* same vector for all blocks */

  275.     for (b=0; b<6; b++)

  276.         s->mv[b] = *mv;

  277. 

  278.     return s->mb_type;

  279. }

  280. 

  281. static void vp56_add_predictors_dc(VP56Context *s, VP56Frame ref_frame)

  282. {

  283.     int idx = s->idct_scantable[0];

  284.     int b;

  285. 

  286.     for (b=0; b<6; b++) {

  287.         VP56RefDc *ab = &s->above_blocks[s->above_block_idx[b]];

  288.         VP56RefDc *lb = &s->left_block[ff_vp56_b6to4[b]];

  289.         int count = 0;

  290.         int dc = 0;

  291.         int i;

  292. 

  293.         if (ref_frame == lb->ref_frame) {

  294.             dc += lb->dc_coeff;

  295.             count++;

  296.         }

  297.         if (ref_frame == ab->ref_frame) {

  298.             dc += ab->dc_coeff;

  299.             count++;

  300.         }

  301.         if (s->avctx->codec->id == AV_CODEC_ID_VP5)

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

  303.                 if (count < 2 && ref_frame == ab[-1+2*i].ref_frame) {

  304.                     dc += ab[-1+2*i].dc_coeff;

  305.                     count++;

  306.                 }

  307.         if (count == 0)

  308.             dc = s->prev_dc[ff_vp56_b2p[b]][ref_frame];

  309.         else if (count == 2)

  310.             dc /= 2;

  311. 

  312.         s->block_coeff[b][idx] += dc;

  313.         s->prev_dc[ff_vp56_b2p[b]][ref_frame] = s->block_coeff[b][idx];

  314.         ab->dc_coeff = s->block_coeff[b][idx];

  315.         ab->ref_frame = ref_frame;

  316.         lb->dc_coeff = s->block_coeff[b][idx];

  317.         lb->ref_frame = ref_frame;

  318.         s->block_coeff[b][idx] *= s->dequant_dc;

  319.     }

  320. }

  321. 

  322. static void vp56_deblock_filter(VP56Context *s, uint8_t *yuv,

  323.                                 ptrdiff_t stride, int dx, int dy)

  324. {

  325.     if (s->avctx->codec->id == AV_CODEC_ID_VP5) {

  326.     int t = ff_vp56_filter_threshold[s->quantizer];

  327.     if (dx)  s->vp56dsp.edge_filter_hor(yuv +         10-dx , stride, t);

  328.     if (dy)  s->vp56dsp.edge_filter_ver(yuv + stride*(10-dy), stride, t);

  329.     } else {

  330.         int * bounding_values = s->bounding_values_array + 127;

  331.         if (dx)

  332.             ff_vp3dsp_h_loop_filter_12(yuv +         10-dx, stride, bounding_values);

  333.         if (dy)

  334.             ff_vp3dsp_v_loop_filter_12(yuv + stride*(10-dy), stride, bounding_values);

  335.     }

  336. }

  337. 

  338. static void vp56_mc(VP56Context *s, int b, int plane, uint8_t *src,

  339.                     ptrdiff_t stride, int x, int y)

  340. {

  341.     uint8_t *dst = s->frames[VP56_FRAME_CURRENT]->data[plane] + s->block_offset[b];

  342.     uint8_t *src_block;

  343.     int src_offset;

  344.     int overlap_offset = 0;

  345.     int mask = s->vp56_coord_div[b] - 1;

  346.     int deblock_filtering = s->deblock_filtering;

  347.     int dx;

  348.     int dy;

  349. 

  350.     if (s->avctx->skip_loop_filter >= AVDISCARD_ALL ||

  351.         (s->avctx->skip_loop_filter >= AVDISCARD_NONKEY

  352.          && !s->frames[VP56_FRAME_CURRENT]->key_frame))

  353.         deblock_filtering = 0;

  354. 

  355.     dx = s->mv[b].x / s->vp56_coord_div[b];

  356.     dy = s->mv[b].y / s->vp56_coord_div[b];

  357. 

  358.     if (b >= 4) {

  359.         x /= 2;

  360.         y /= 2;

  361.     }

  362.     x += dx - 2;

  363.     y += dy - 2;

  364. 

  365.     if (x<0 || x+12>=s->plane_width[plane] ||

  366.         y<0 || y+12>=s->plane_height[plane]) {

  367.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer,

  368.                                  src + s->block_offset[b] + (dy-2)*stride + (dx-2),

  369.                                  stride, stride,

  370.                                  12, 12, x, y,

  371.                                  s->plane_width[plane],

  372.                                  s->plane_height[plane]);

  373.         src_block = s->edge_emu_buffer;

  374.         src_offset = 2 + 2*stride;

  375.     } else if (deblock_filtering) {

  376.         /* only need a 12x12 block, but there is no such dsp function, */

  377.         /* so copy a 16x12 block */

  378.         s->hdsp.put_pixels_tab[0][0](s->edge_emu_buffer,

  379.                                      src + s->block_offset[b] + (dy-2)*stride + (dx-2),

  380.                                      stride, 12);

  381.         src_block = s->edge_emu_buffer;

  382.         src_offset = 2 + 2*stride;

  383.     } else {

  384.         src_block = src;

  385.         src_offset = s->block_offset[b] + dy*stride + dx;

  386.     }

  387. 

  388.     if (deblock_filtering)

  389.         vp56_deblock_filter(s, src_block, stride, dx&7, dy&7);

  390. 

  391.     if (s->mv[b].x & mask)

  392.         overlap_offset += (s->mv[b].x > 0) ? 1 : -1;

  393.     if (s->mv[b].y & mask)

  394.         overlap_offset += (s->mv[b].y > 0) ? stride : -stride;

  395. 

  396.     if (overlap_offset) {

  397.         if (s->filter)

  398.             s->filter(s, dst, src_block, src_offset, src_offset+overlap_offset,

  399.                       stride, s->mv[b], mask, s->filter_selection, b<4);

  400.         else

  401.             s->vp3dsp.put_no_rnd_pixels_l2(dst, src_block+src_offset,

  402.                                            src_block+src_offset+overlap_offset,

  403.                                            stride, 8);

  404.     } else {

  405.         s->hdsp.put_pixels_tab[1][0](dst, src_block+src_offset, stride, 8);

  406.     }

  407. }

  408. 

  409. static void vp56_idct_put(VP56Context *s, uint8_t * dest, ptrdiff_t stride, int16_t *block, int selector)

  410. {

  411.     if (selector > 10 || selector == 1)

  412.         s->vp3dsp.idct_put(dest, stride, block);

  413.     else

  414.         ff_vp3dsp_idct10_put(dest, stride, block);

  415. }

  416. 

  417. static void vp56_idct_add(VP56Context *s, uint8_t * dest, ptrdiff_t stride, int16_t *block, int selector)

  418. {

  419.     if (selector > 10)

  420.         s->vp3dsp.idct_add(dest, stride, block);

  421.     else if (selector > 1)

  422.         ff_vp3dsp_idct10_add(dest, stride, block);

  423.     else

  424.         s->vp3dsp.idct_dc_add(dest, stride, block);

  425. }

  426. 

  427. static av_always_inline void vp56_render_mb(VP56Context *s, int row, int col, int is_alpha, VP56mb mb_type)

  428. {

  429.     int b, ab, b_max, plane, off;

  430.     AVFrame *frame_current, *frame_ref;

  431.     VP56Frame ref_frame = ff_vp56_reference_frame[mb_type];

  432. 

  433.     vp56_add_predictors_dc(s, ref_frame);

  434. 

  435.     frame_current = s->frames[VP56_FRAME_CURRENT];

  436.     frame_ref = s->frames[ref_frame];

  437.     if (mb_type != VP56_MB_INTRA && !frame_ref->data[0])

  438.         return;

  439. 

  440.     ab = 6*is_alpha;

  441.     b_max = 6 - 2*is_alpha;

  442. 

  443.     switch (mb_type) {

  444.         case VP56_MB_INTRA:

  445.             for (b=0; b<b_max; b++) {

  446.                 plane = ff_vp56_b2p[b+ab];

  447.                 vp56_idct_put(s, frame_current->data[plane] + s->block_offset[b],

  448.                                 s->stride[plane], s->block_coeff[b], s->idct_selector[b]);

  449.             }

  450.             break;

  451. 

  452.         case VP56_MB_INTER_NOVEC_PF:

  453.         case VP56_MB_INTER_NOVEC_GF:

  454.             for (b=0; b<b_max; b++) {

  455.                 plane = ff_vp56_b2p[b+ab];

  456.                 off = s->block_offset[b];

  457.                 s->hdsp.put_pixels_tab[1][0](frame_current->data[plane] + off,

  458.                                              frame_ref->data[plane] + off,

  459.                                              s->stride[plane], 8);

  460.                 vp56_idct_add(s, frame_current->data[plane] + off,

  461.                               s->stride[plane], s->block_coeff[b], s->idct_selector[b]);

  462.             }

  463.             break;

  464. 

  465.         case VP56_MB_INTER_DELTA_PF:

  466.         case VP56_MB_INTER_V1_PF:

  467.         case VP56_MB_INTER_V2_PF:

  468.         case VP56_MB_INTER_DELTA_GF:

  469.         case VP56_MB_INTER_4V:

  470.         case VP56_MB_INTER_V1_GF:

  471.         case VP56_MB_INTER_V2_GF:

  472.             for (b=0; b<b_max; b++) {

  473.                 int x_off = b==1 || b==3 ? 8 : 0;

  474.                 int y_off = b==2 || b==3 ? 8 : 0;

  475.                 plane = ff_vp56_b2p[b+ab];

  476.                 vp56_mc(s, b, plane, frame_ref->data[plane], s->stride[plane],

  477.                         16*col+x_off, 16*row+y_off);

  478.                 vp56_idct_add(s, frame_current->data[plane] + s->block_offset[b],

  479.                               s->stride[plane], s->block_coeff[b], s->idct_selector[b]);

  480.             }

  481.             break;

  482.     }

  483. 

  484.     if (is_alpha) {

  485.         s->block_coeff[4][0] = 0;

  486.         s->block_coeff[5][0] = 0;

  487.     }

  488. }

  489. 

  490. static int vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)

  491. {

  492.     VP56mb mb_type;

  493.     int ret;

  494. 

  495.     if (s->frames[VP56_FRAME_CURRENT]->key_frame)

  496.         mb_type = VP56_MB_INTRA;

  497.     else

  498.         mb_type = vp56_decode_mv(s, row, col);

  499. 

  500.     ret = s->parse_coeff(s);

  501.     if (ret < 0)

  502.         return ret;

  503. 

  504.     vp56_render_mb(s, row, col, is_alpha, mb_type);

  505. 

  506.     return 0;

  507. }

  508. 

  509. static int vp56_conceal_mb(VP56Context *s, int row, int col, int is_alpha)

  510. {

  511.     VP56mb mb_type;

  512. 

  513.     if (s->frames[VP56_FRAME_CURRENT]->key_frame)

  514.         mb_type = VP56_MB_INTRA;

  515.     else

  516.         mb_type = vp56_conceal_mv(s, row, col);

  517. 

  518.     vp56_render_mb(s, row, col, is_alpha, mb_type);

  519. 

  520.     return 0;

  521. }

  522. 

  523. static int vp56_size_changed(VP56Context *s)

  524. {

  525.     AVCodecContext *avctx = s->avctx;

  526.     int stride = s->frames[VP56_FRAME_CURRENT]->linesize[0];

  527.     int i;

  528. 

  529.     s->plane_width[0]  = s->plane_width[3]  = avctx->coded_width;

  530.     s->plane_width[1]  = s->plane_width[2]  = avctx->coded_width/2;

  531.     s->plane_height[0] = s->plane_height[3] = avctx->coded_height;

  532.     s->plane_height[1] = s->plane_height[2] = avctx->coded_height/2;

  533. 

  534.     s->have_undamaged_frame = 0;

  535. 

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

  537.         s->stride[i] = s->flip * s->frames[VP56_FRAME_CURRENT]->linesize[i];

  538. 

  539.     s->mb_width  = (avctx->coded_width +15) / 16;

  540.     s->mb_height = (avctx->coded_height+15) / 16;

  541. 

  542.     if (s->mb_width > 1000 || s->mb_height > 1000) {

  543.         ff_set_dimensions(avctx, 0, 0);

  544.         av_log(avctx, AV_LOG_ERROR, "picture too big\n");

  545.         return AVERROR_INVALIDDATA;

  546.     }

  547. 

  548.     av_reallocp_array(&s->above_blocks, 4*s->mb_width+6,

  549.                       sizeof(*s->above_blocks));

  550.     av_reallocp_array(&s->macroblocks, s->mb_width*s->mb_height,

  551.                       sizeof(*s->macroblocks));

  552.     av_free(s->edge_emu_buffer_alloc);

  553.     s->edge_emu_buffer_alloc = av_malloc(16*stride);

  554.     s->edge_emu_buffer = s->edge_emu_buffer_alloc;

  555.     if (!s->above_blocks || !s->macroblocks || !s->edge_emu_buffer_alloc)

  556.         return AVERROR(ENOMEM);

  557.     if (s->flip < 0)

  558.         s->edge_emu_buffer += 15 * stride;

  559. 

  560.     if (s->alpha_context)

  561.         return vp56_size_changed(s->alpha_context);

  562. 

  563.     return 0;

  564. }

  565. 

  566. static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *, int, int);

  567. 

  568. int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

  569.                          AVPacket *avpkt)

  570. {

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

  572.     VP56Context *s = avctx->priv_data;

  573.     AVFrame *const p = s->frames[VP56_FRAME_CURRENT];

  574.     int remaining_buf_size = avpkt->size;

  575.     int av_uninit(alpha_offset);

  576.     int i, res;

  577.     int ret;

  578. 

  579.     if (s->has_alpha) {

  580.         if (remaining_buf_size < 3)

  581.             return AVERROR_INVALIDDATA;

  582.         alpha_offset = bytestream_get_be24(&buf);

  583.         remaining_buf_size -= 3;

  584.         if (remaining_buf_size < alpha_offset)

  585.             return AVERROR_INVALIDDATA;

  586.     }

  587. 

  588.     res = s->parse_header(s, buf, remaining_buf_size);

  589.     if (res < 0)

  590.         return res;

  591. 

  592.     if (res == VP56_SIZE_CHANGE) {

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

  594.             av_frame_unref(s->frames[i]);

  595.             if (s->alpha_context)

  596.                 av_frame_unref(s->alpha_context->frames[i]);

  597.         }

  598.     }

  599. 

  600.     ret = ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF);

  601.     if (ret < 0) {

  602.         if (res == VP56_SIZE_CHANGE)

  603.             ff_set_dimensions(avctx, 0, 0);

  604.         return ret;

  605.     }

  606. 

  607.     if (avctx->pix_fmt == AV_PIX_FMT_YUVA420P) {

  608.         av_frame_unref(s->alpha_context->frames[VP56_FRAME_CURRENT]);

  609.         if ((ret = av_frame_ref(s->alpha_context->frames[VP56_FRAME_CURRENT], p)) < 0) {

  610.             av_frame_unref(p);

  611.             if (res == VP56_SIZE_CHANGE)

  612.                 ff_set_dimensions(avctx, 0, 0);

  613.             return ret;

  614.         }

  615.     }

  616. 

  617.     if (res == VP56_SIZE_CHANGE) {

  618.         if (vp56_size_changed(s)) {

  619.             av_frame_unref(p);

  620.             return AVERROR_INVALIDDATA;

  621.         }

  622.     }

  623. 

  624.     if (avctx->pix_fmt == AV_PIX_FMT_YUVA420P) {

  625.         int bak_w = avctx->width;

  626.         int bak_h = avctx->height;

  627.         int bak_cw = avctx->coded_width;

  628.         int bak_ch = avctx->coded_height;

  629.         buf += alpha_offset;

  630.         remaining_buf_size -= alpha_offset;

  631. 

  632.         res = s->alpha_context->parse_header(s->alpha_context, buf, remaining_buf_size);

  633.         if (res != 0) {

  634.             if(res==VP56_SIZE_CHANGE) {

  635.                 av_log(avctx, AV_LOG_ERROR, "Alpha reconfiguration\n");

  636.                 avctx->width  = bak_w;

  637.                 avctx->height = bak_h;

  638.                 avctx->coded_width  = bak_cw;

  639.                 avctx->coded_height = bak_ch;

  640.             }

  641.             av_frame_unref(p);

  642.             return AVERROR_INVALIDDATA;

  643.         }

  644.     }

  645. 

  646.     s->discard_frame = 0;

  647.     avctx->execute2(avctx, ff_vp56_decode_mbs, 0, 0, (avctx->pix_fmt == AV_PIX_FMT_YUVA420P) + 1);

  648. 

  649.     if (s->discard_frame)

  650.         return AVERROR_INVALIDDATA;

  651. 

  652.     if ((res = av_frame_ref(data, p)) < 0)

  653.         return res;

  654.     *got_frame = 1;

  655. 

  656.     return avpkt->size;

  657. }

  658. 

  659. static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *data,

  660.                               int jobnr, int threadnr)

  661. {

  662.     VP56Context *s0 = avctx->priv_data;

  663.     int is_alpha = (jobnr == 1);

  664.     VP56Context *s = is_alpha ? s0->alpha_context : s0;

  665.     AVFrame *const p = s->frames[VP56_FRAME_CURRENT];

  666.     int mb_row, mb_col, mb_row_flip, mb_offset = 0;

  667.     int block, y, uv;

  668.     ptrdiff_t stride_y, stride_uv;

  669.     int res;

  670.     int damaged = 0;

  671. 

  672.     if (p->key_frame) {

  673.         p->pict_type = AV_PICTURE_TYPE_I;

  674.         s->default_models_init(s);

  675.         for (block=0; block<s->mb_height*s->mb_width; block++)

  676.             s->macroblocks[block].type = VP56_MB_INTRA;

  677.     } else {

  678.         p->pict_type = AV_PICTURE_TYPE_P;

  679.         vp56_parse_mb_type_models(s);

  680.         s->parse_vector_models(s);

  681.         s->mb_type = VP56_MB_INTER_NOVEC_PF;

  682.     }

  683. 

  684.     if (s->parse_coeff_models(s))

  685.         goto next;

  686. 

  687.     memset(s->prev_dc, 0, sizeof(s->prev_dc));

  688.     s->prev_dc[1][VP56_FRAME_CURRENT] = 128;

  689.     s->prev_dc[2][VP56_FRAME_CURRENT] = 128;

  690. 

  691.     for (block=0; block < 4*s->mb_width+6; block++) {

  692.         s->above_blocks[block].ref_frame = VP56_FRAME_NONE;

  693.         s->above_blocks[block].dc_coeff = 0;

  694.         s->above_blocks[block].not_null_dc = 0;

  695.     }

  696.     s->above_blocks[2*s->mb_width + 2].ref_frame = VP56_FRAME_CURRENT;

  697.     s->above_blocks[3*s->mb_width + 4].ref_frame = VP56_FRAME_CURRENT;

  698. 

  699.     stride_y  = p->linesize[0];

  700.     stride_uv = p->linesize[1];

  701. 

  702.     if (s->flip < 0)

  703.         mb_offset = 7;

  704. 

  705.     /* main macroblocks loop */

  706.     for (mb_row=0; mb_row<s->mb_height; mb_row++) {

  707.         if (s->flip < 0)

  708.             mb_row_flip = s->mb_height - mb_row - 1;

  709.         else

  710.             mb_row_flip = mb_row;

  711. 

  712.         for (block=0; block<4; block++) {

  713.             s->left_block[block].ref_frame = VP56_FRAME_NONE;

  714.             s->left_block[block].dc_coeff = 0;

  715.             s->left_block[block].not_null_dc = 0;

  716.         }

  717.         memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));

  718.         memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));

  719. 

  720.         s->above_block_idx[0] = 1;

  721.         s->above_block_idx[1] = 2;

  722.         s->above_block_idx[2] = 1;

  723.         s->above_block_idx[3] = 2;

  724.         s->above_block_idx[4] = 2*s->mb_width + 2 + 1;

  725.         s->above_block_idx[5] = 3*s->mb_width + 4 + 1;

  726. 

  727.         s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;

  728.         s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;

  729.         s->block_offset[1] = s->block_offset[0] + 8;

  730.         s->block_offset[3] = s->block_offset[2] + 8;

  731.         s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;

  732.         s->block_offset[5] = s->block_offset[4];

  733. 

  734.         for (mb_col=0; mb_col<s->mb_width; mb_col++) {

  735.             if (!damaged) {

  736.                 int ret = vp56_decode_mb(s, mb_row, mb_col, is_alpha);

  737.                 if (ret < 0) {

  738.                     damaged = 1;

  739.                     if (!s->have_undamaged_frame || !avctx->error_concealment) {

  740.                         s->discard_frame = 1;

  741.                         return AVERROR_INVALIDDATA;

  742.                     }

  743.                 }

  744.             }

  745.             if (damaged)

  746.                 vp56_conceal_mb(s, mb_row, mb_col, is_alpha);

  747. 

  748.             for (y=0; y<4; y++) {

  749.                 s->above_block_idx[y] += 2;

  750.                 s->block_offset[y] += 16;

  751.             }

  752. 

  753.             for (uv=4; uv<6; uv++) {

  754.                 s->above_block_idx[uv] += 1;

  755.                 s->block_offset[uv] += 8;

  756.             }

  757.         }

  758.     }

  759. 

  760.     if (!damaged)

  761.         s->have_undamaged_frame = 1;

  762. 

  763. next:

  764.     if (p->key_frame || s->golden_frame) {

  765.         av_frame_unref(s->frames[VP56_FRAME_GOLDEN]);

  766.         if ((res = av_frame_ref(s->frames[VP56_FRAME_GOLDEN], p)) < 0)

  767.             return res;

  768.     }

  769. 

  770.     av_frame_unref(s->frames[VP56_FRAME_PREVIOUS]);

  771.     FFSWAP(AVFrame *, s->frames[VP56_FRAME_CURRENT],

  772.                       s->frames[VP56_FRAME_PREVIOUS]);

  773.     return 0;

  774. }

  775. 

  776. av_cold int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)

  777. {

  778.     VP56Context *s = avctx->priv_data;

  779.     return ff_vp56_init_context(avctx, s, flip, has_alpha);

  780. }

  781. 

  782. av_cold int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,

  783.                                   int flip, int has_alpha)

  784. {

  785.     int i;

  786. 

  787.     s->avctx = avctx;

  788.     avctx->pix_fmt = has_alpha ? AV_PIX_FMT_YUVA420P : AV_PIX_FMT_YUV420P;

  789.     if (avctx->skip_alpha) avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  790. 

  791.     ff_h264chroma_init(&s->h264chroma, 8);

  792.     ff_hpeldsp_init(&s->hdsp, avctx->flags);

  793.     ff_videodsp_init(&s->vdsp, 8);

  794.     ff_vp3dsp_init(&s->vp3dsp, avctx->flags);

  795.     for (i = 0; i < 64; i++) {

  796. #define TRANSPOSE(x) (((x) >> 3) | (((x) & 7) << 3))

  797.         s->idct_scantable[i] = TRANSPOSE(ff_zigzag_direct[i]);

  798. #undef TRANSPOSE

  799.     }

  800. 

  801.     for (i = 0; i < FF_ARRAY_ELEMS(s->frames); i++) {

  802.         s->frames[i] = av_frame_alloc();

  803.         if (!s->frames[i]) {

  804.             ff_vp56_free(avctx);

  805.             return AVERROR(ENOMEM);

  806.         }

  807.     }

  808.     s->edge_emu_buffer_alloc = NULL;

  809. 

  810.     s->above_blocks = NULL;

  811.     s->macroblocks = NULL;

  812.     s->quantizer = -1;

  813.     s->deblock_filtering = 1;

  814.     s->golden_frame = 0;

  815. 

  816.     s->filter = NULL;

  817. 

  818.     s->has_alpha = has_alpha;

  819. 

  820.     s->modelp = &s->model;

  821. 

  822.     if (flip) {

  823.         s->flip = -1;

  824.         s->frbi = 2;

  825.         s->srbi = 0;

  826.     } else {

  827.         s->flip = 1;

  828.         s->frbi = 0;

  829.         s->srbi = 2;

  830.     }

  831. 

  832.     return 0;

  833. }

  834. 

  835. av_cold int ff_vp56_free(AVCodecContext *avctx)

  836. {

  837.     VP56Context *s = avctx->priv_data;

  838.     return ff_vp56_free_context(s);

  839. }

  840. 

  841. av_cold int ff_vp56_free_context(VP56Context *s)

  842. {

  843.     int i;

  844. 

  845.     av_freep(&s->above_blocks);

  846.     av_freep(&s->macroblocks);

  847.     av_freep(&s->edge_emu_buffer_alloc);

  848. 

  849.     for (i = 0; i < FF_ARRAY_ELEMS(s->frames); i++)

  850.         av_frame_free(&s->frames[i]);

  851. 

  852.     return 0;

  853. }