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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.     s->quantizer = quantizer;

  37.     s->dequant_dc = vp56_dc_dequant[quantizer] << 2;

  38.     s->dequant_ac = vp56_ac_dequant[quantizer] << 2;

  39.     memset(s->qscale_table, quantizer, s->mb_width);

  40. }

  41. 

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

  43.                                        VP56Frame ref_frame)

  44. {

  45.     int nb_pred = 0;

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

  47.     int pos, offset;

  48.     VP56mv mvp;

  49. 

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

  51.         mvp.x = col + vp56_candidate_predictor_pos[pos][0];

  52.         mvp.y = row + vp56_candidate_predictor_pos[pos][1];

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

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

  55.             continue;

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

  57. 

  58.         if (vp56_reference_frame[s->macroblocks[offset].type] != ref_frame)

  59.             continue;

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

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

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

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

  64.             continue;

  65. 

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

  67.         if (nb_pred > 1) {

  68.             nb_pred = -1;

  69.             break;

  70.         }

  71.         s->vector_candidate_pos = pos;

  72.     }

  73. 

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

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

  76. 

  77.     return nb_pred+1;

  78. }

  79. 

  80. static void vp56_parse_mb_type_models(VP56Context *s)

  81. {

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

  83.     VP56Model *model = s->modelp;

  84.     int i, ctx, type;

  85. 

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

  87.         if (vp56_rac_get_prob(c, 174)) {

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

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

  90.                    vp56_pre_def_mb_type_stats[idx][ctx],

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

  92.         }

  93.         if (vp56_rac_get_prob(c, 254)) {

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

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

  96.                     if (vp56_rac_get_prob(c, 205)) {

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

  98. 

  99.                         delta = vp56_rac_get_tree(c, vp56_pmbtm_tree,

  100.                                                   vp56_mb_type_model_model);

  101.                         if (!delta)

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

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

  104.                     }

  105.                 }

  106.             }

  107.         }

  108.     }

  109. 

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

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

  112.         int p[10];

  113. 

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

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

  116. 

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

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

  119. 

  120.             /* conservative MB type probability */

  121.             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]);

  122. 

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

  124. 

  125.             /* binary tree parsing probabilities */

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

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

  128.             p0234 = p02 + p34;

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

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

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

  132.             p5689 = p56 + p89;

  133.             p156789 = p17 + p5689;

  134. 

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

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

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

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

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

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

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

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

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

  144. 

  145.             /* restore initial value */

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

  147.         }

  148.     }

  149. }

  150. 

  151. static VP56mb vp56_parse_mb_type(VP56Context *s,

  152.                                  VP56mb prev_type, int ctx)

  153. {

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

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

  156. 

  157.     if (vp56_rac_get_prob(c, mb_type_model[0]))

  158.         return prev_type;

  159.     else

  160.         return vp56_rac_get_tree(c, vp56_pmbt_tree, mb_type_model);

  161. }

  162. 

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

  164. {

  165.     VP56mv mv = {0,0};

  166.     int type[4];

  167.     int b;

  168. 

  169.     /* parse each block type */

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

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

  172.         if (type[b])

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

  174.     }

  175. 

  176.     /* get vectors */

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

  178.         switch (type[b]) {

  179.             case VP56_MB_INTER_NOVEC_PF:

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

  181.                 break;

  182.             case VP56_MB_INTER_DELTA_PF:

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

  184.                 break;

  185.             case VP56_MB_INTER_V1_PF:

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

  187.                 break;

  188.             case VP56_MB_INTER_V2_PF:

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

  190.                 break;

  191.         }

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

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

  194.     }

  195. 

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

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

  198. 

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

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

  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.     } else {

  204.         s->mv[4] = s->mv[5] = (VP56mv) {mv.x/4, mv.y/4};

  205.     }

  206. }

  207. 

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

  209. {

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

  211.     int ctx, b;

  212. 

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

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

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

  216. 

  217.     switch (s->mb_type) {

  218.         case VP56_MB_INTER_V1_PF:

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

  220.             break;

  221. 

  222.         case VP56_MB_INTER_V2_PF:

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

  224.             break;

  225. 

  226.         case VP56_MB_INTER_V1_GF:

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

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

  229.             break;

  230. 

  231.         case VP56_MB_INTER_V2_GF:

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

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

  234.             break;

  235. 

  236.         case VP56_MB_INTER_DELTA_PF:

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

  238.             mv = &vect;

  239.             break;

  240. 

  241.         case VP56_MB_INTER_DELTA_GF:

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

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

  244.             mv = &vect;

  245.             break;

  246. 

  247.         case VP56_MB_INTER_4V:

  248.             vp56_decode_4mv(s, row, col);

  249.             return s->mb_type;

  250. 

  251.         default:

  252.             mv = &vect;

  253.             break;

  254.     }

  255. 

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

  257. 

  258.     /* same vector for all blocks */

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

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

  261. 

  262.     return s->mb_type;

  263. }

  264. 

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

  266. {

  267.     int idx = s->scantable.permutated[0];

  268.     int b;

  269. 

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

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

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

  273.         int count = 0;

  274.         int dc = 0;

  275.         int i;

  276. 

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

  278.             dc += lb->dc_coeff;

  279.             count++;

  280.         }

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

  282.             dc += ab->dc_coeff;

  283.             count++;

  284.         }

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

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

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

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

  289.                     count++;

  290.                 }

  291.         if (count == 0)

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

  293.         else if (count == 2)

  294.             dc /= 2;

  295. 

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

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

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

  299.         ab->ref_frame = ref_frame;

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

  301.         lb->ref_frame = ref_frame;

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

  303.     }

  304. }

  305. 

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

  307.                                 int stride, int dx, int dy)

  308. {

  309.     int t = vp56_filter_threshold[s->quantizer];

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

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

  312. }

  313. 

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

  315.                     int stride, int x, int y)

  316. {

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

  318.     uint8_t *src_block;

  319.     int src_offset;

  320.     int overlap_offset = 0;

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

  322.     int deblock_filtering = s->deblock_filtering;

  323.     int dx;

  324.     int dy;

  325. 

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

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

  328.          && !s->framep[VP56_FRAME_CURRENT]->key_frame))

  329.         deblock_filtering = 0;

  330. 

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

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

  333. 

  334.     if (b >= 4) {

  335.         x /= 2;

  336.         y /= 2;

  337.     }

  338.     x += dx - 2;

  339.     y += dy - 2;

  340. 

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

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

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

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

  345.                             stride, 12, 12, x, y,

  346.                             s->plane_width[plane],

  347.                             s->plane_height[plane]);

  348.         src_block = s->edge_emu_buffer;

  349.         src_offset = 2 + 2*stride;

  350.     } else if (deblock_filtering) {

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

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

  353.         s->dsp.put_pixels_tab[0][0](s->edge_emu_buffer,

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

  355.                                     stride, 12);

  356.         src_block = s->edge_emu_buffer;

  357.         src_offset = 2 + 2*stride;

  358.     } else {

  359.         src_block = src;

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

  361.     }

  362. 

  363.     if (deblock_filtering)

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

  365. 

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

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

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

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

  370. 

  371.     if (overlap_offset) {

  372.         if (s->filter)

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

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

  375.         else

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

  377.                                            src_block+src_offset+overlap_offset,

  378.                                            stride, 8);

  379.     } else {

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

  381.     }

  382. }

  383. 

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

  385. {

  386.     AVFrame *frame_current, *frame_ref;

  387.     VP56mb mb_type;

  388.     VP56Frame ref_frame;

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

  390. 

  391.     if (s->framep[VP56_FRAME_CURRENT]->key_frame)

  392.         mb_type = VP56_MB_INTRA;

  393.     else

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

  395.     ref_frame = vp56_reference_frame[mb_type];

  396. 

  397.     s->parse_coeff(s);

  398. 

  399.     vp56_add_predictors_dc(s, ref_frame);

  400. 

  401.     frame_current = s->framep[VP56_FRAME_CURRENT];

  402.     frame_ref = s->framep[ref_frame];

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

  404.         return;

  405. 

  406.     ab = 6*is_alpha;

  407.     b_max = 6 - 2*is_alpha;

  408. 

  409.     switch (mb_type) {

  410.         case VP56_MB_INTRA:

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

  412.                 plane = ff_vp56_b2p[b+ab];

  413.                 s->vp3dsp.idct_put(frame_current->data[plane] + s->block_offset[b],

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

  415.             }

  416.             break;

  417. 

  418.         case VP56_MB_INTER_NOVEC_PF:

  419.         case VP56_MB_INTER_NOVEC_GF:

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

  421.                 plane = ff_vp56_b2p[b+ab];

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

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

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

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

  426.                 s->vp3dsp.idct_add(frame_current->data[plane] + off,

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

  428.             }

  429.             break;

  430. 

  431.         case VP56_MB_INTER_DELTA_PF:

  432.         case VP56_MB_INTER_V1_PF:

  433.         case VP56_MB_INTER_V2_PF:

  434.         case VP56_MB_INTER_DELTA_GF:

  435.         case VP56_MB_INTER_4V:

  436.         case VP56_MB_INTER_V1_GF:

  437.         case VP56_MB_INTER_V2_GF:

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

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

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

  441.                 plane = ff_vp56_b2p[b+ab];

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

  443.                         16*col+x_off, 16*row+y_off);

  444.                 s->vp3dsp.idct_add(frame_current->data[plane] + s->block_offset[b],

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

  446.             }

  447.             break;

  448.     }

  449. 

  450.     if (is_alpha) {

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

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

  453.     }

  454. }

  455. 

  456. static int vp56_size_changed(VP56Context *s)

  457. {

  458.     AVCodecContext *avctx = s->avctx;

  459.     int stride = s->framep[VP56_FRAME_CURRENT]->linesize[0];

  460.     int i;

  461. 

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

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

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

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

  466. 

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

  468.         s->stride[i] = s->flip * s->framep[VP56_FRAME_CURRENT]->linesize[i];

  469. 

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

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

  472. 

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

  474.         avcodec_set_dimensions(avctx, 0, 0);

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

  476.         return -1;

  477.     }

  478. 

  479.     s->qscale_table = av_realloc(s->qscale_table, s->mb_width);

  480.     s->above_blocks = av_realloc(s->above_blocks,

  481.                                  (4*s->mb_width+6) * sizeof(*s->above_blocks));

  482.     s->macroblocks = av_realloc(s->macroblocks,

  483.                                 s->mb_width*s->mb_height*sizeof(*s->macroblocks));

  484.     av_free(s->edge_emu_buffer_alloc);

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

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

  487.     if (s->flip < 0)

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

  489. 

  490.     if (s->alpha_context)

  491.         return vp56_size_changed(s->alpha_context);

  492. 

  493.     return 0;

  494. }

  495. 

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

  497. 

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

  499.                          AVPacket *avpkt)

  500. {

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

  502.     VP56Context *s = avctx->priv_data;

  503.     AVFrame *p = 0;

  504.     int remaining_buf_size = avpkt->size;

  505.     int av_uninit(alpha_offset);

  506.     int i, res;

  507. 

  508.     /* select a current frame from the unused frames */

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

  510.         if (!s->frames[i].data[0]) {

  511.             p = &s->frames[i];

  512.             break;

  513.         }

  514.     }

  515.     av_assert0(p != 0);

  516.     s->framep[VP56_FRAME_CURRENT] = p;

  517.     if (s->alpha_context)

  518.         s->alpha_context->framep[VP56_FRAME_CURRENT] = p;

  519. 

  520.     if (s->has_alpha) {

  521.         if (remaining_buf_size < 3)

  522.             return -1;

  523.         alpha_offset = bytestream_get_be24(&buf);

  524.         remaining_buf_size -= 3;

  525.         if (remaining_buf_size < alpha_offset)

  526.             return -1;

  527.     }

  528. 

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

  530.     if (res < 0)

  531.         return res;

  532. 

  533.     if (res == VP56_SIZE_CHANGE) {

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

  535.             if (s->frames[i].data[0])

  536.                 avctx->release_buffer(avctx, &s->frames[i]);

  537.         }

  538.     }

  539. 

  540.     p->reference = 3;

  541.     if (ff_get_buffer(avctx, p) < 0) {

  542.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  543.         return -1;

  544.     }

  545. 

  546.     if (res == VP56_SIZE_CHANGE) {

  547.         if (vp56_size_changed(s)) {

  548.             avctx->release_buffer(avctx, p);

  549.             return -1;

  550.         }

  551.     }

  552. 

  553.     if (s->has_alpha) {

  554.         int bak_w = avctx->width;

  555.         int bak_h = avctx->height;

  556.         int bak_cw = avctx->coded_width;

  557.         int bak_ch = avctx->coded_height;

  558.         buf += alpha_offset;

  559.         remaining_buf_size -= alpha_offset;

  560. 

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

  562.         if (res != 0) {

  563.             if(res==VP56_SIZE_CHANGE) {

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

  565.                 avctx->width  = bak_w;

  566.                 avctx->height = bak_h;

  567.                 avctx->coded_width  = bak_cw;

  568.                 avctx->coded_height = bak_ch;

  569.             }

  570.             avctx->release_buffer(avctx, p);

  571.             return -1;

  572.         }

  573.     }

  574. 

  575.     avctx->execute2(avctx, ff_vp56_decode_mbs, 0, 0, s->has_alpha + 1);

  576. 

  577.     /* release frames that aren't in use */

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

  579.         AVFrame *victim = &s->frames[i];

  580.         if (!victim->data[0])

  581.             continue;

  582.         if (victim != s->framep[VP56_FRAME_PREVIOUS] &&

  583.             victim != s->framep[VP56_FRAME_GOLDEN] &&

  584.             (!s->has_alpha || victim != s->alpha_context->framep[VP56_FRAME_GOLDEN]))

  585.             avctx->release_buffer(avctx, victim);

  586.     }

  587. 

  588.     p->qstride = 0;

  589.     p->qscale_table = s->qscale_table;

  590.     p->qscale_type = FF_QSCALE_TYPE_VP56;

  591.     *(AVFrame*)data = *p;

  592.     *got_frame = 1;

  593. 

  594.     return avpkt->size;

  595. }

  596. 

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

  598.                               int jobnr, int threadnr)

  599. {

  600.     VP56Context *s0 = avctx->priv_data;

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

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

  603.     AVFrame *const p = s->framep[VP56_FRAME_CURRENT];

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

  605.     int block, y, uv, stride_y, stride_uv;

  606. 

  607.     if (p->key_frame) {

  608.         p->pict_type = AV_PICTURE_TYPE_I;

  609.         s->default_models_init(s);

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

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

  612.     } else {

  613.         p->pict_type = AV_PICTURE_TYPE_P;

  614.         vp56_parse_mb_type_models(s);

  615.         s->parse_vector_models(s);

  616.         s->mb_type = VP56_MB_INTER_NOVEC_PF;

  617.     }

  618. 

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

  620.         goto next;

  621. 

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

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

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

  625. 

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

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

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

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

  630.     }

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

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

  633. 

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

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

  636. 

  637.     if (s->flip < 0)

  638.         mb_offset = 7;

  639. 

  640.     /* main macroblocks loop */

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

  642.         if (s->flip < 0)

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

  644.         else

  645.             mb_row_flip = mb_row;

  646. 

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

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

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

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

  651.         }

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

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

  654. 

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

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

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

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

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

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

  661. 

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

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

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

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

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

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

  668. 

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

  670.             vp56_decode_mb(s, mb_row, mb_col, is_alpha);

  671. 

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

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

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

  675.             }

  676. 

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

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

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

  680.             }

  681.         }

  682.     }

  683. 

  684. next:

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

  686.         s->framep[VP56_FRAME_GOLDEN] = p;

  687.     }

  688. 

  689.     FFSWAP(AVFrame *, s->framep[VP56_FRAME_CURRENT],

  690.                       s->framep[VP56_FRAME_PREVIOUS]);

  691.     return 0;

  692. }

  693. 

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

  695. {

  696.     VP56Context *s = avctx->priv_data;

  697.     ff_vp56_init_context(avctx, s, flip, has_alpha);

  698. }

  699. 

  700. av_cold void ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,

  701.                                   int flip, int has_alpha)

  702. {

  703.     int i;

  704. 

  705.     s->avctx = avctx;

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

  707. 

  708.     ff_dsputil_init(&s->dsp, avctx);

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

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

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

  712.     ff_vp56dsp_init(&s->vp56dsp, avctx->codec->id);

  713.     ff_init_scantable_permutation(s->dsp.idct_permutation, s->vp3dsp.idct_perm);

  714.     ff_init_scantable(s->dsp.idct_permutation, &s->scantable,ff_zigzag_direct);

  715. 

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

  717.         s->framep[i] = &s->frames[i];

  718.         avcodec_get_frame_defaults(&s->frames[i]);

  719.     }

  720.     s->framep[VP56_FRAME_UNUSED] = s->framep[VP56_FRAME_GOLDEN];

  721.     s->framep[VP56_FRAME_UNUSED2] = s->framep[VP56_FRAME_GOLDEN2];

  722.     s->edge_emu_buffer_alloc = NULL;

  723. 

  724.     s->above_blocks = NULL;

  725.     s->macroblocks = NULL;

  726.     s->quantizer = -1;

  727.     s->deblock_filtering = 1;

  728.     s->golden_frame = 0;

  729. 

  730.     s->filter = NULL;

  731. 

  732.     s->has_alpha = has_alpha;

  733. 

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

  735. 

  736.     if (flip) {

  737.         s->flip = -1;

  738.         s->frbi = 2;

  739.         s->srbi = 0;

  740.     } else {

  741.         s->flip = 1;

  742.         s->frbi = 0;

  743.         s->srbi = 2;

  744.     }

  745. }

  746. 

  747. av_cold int ff_vp56_free(AVCodecContext *avctx)

  748. {

  749.     VP56Context *s = avctx->priv_data;

  750.     return ff_vp56_free_context(s);

  751. }

  752. 

  753. av_cold int ff_vp56_free_context(VP56Context *s)

  754. {

  755.     AVCodecContext *avctx = s->avctx;

  756.     int i;

  757. 

  758.     av_freep(&s->qscale_table);

  759.     av_freep(&s->above_blocks);

  760.     av_freep(&s->macroblocks);

  761.     av_freep(&s->edge_emu_buffer_alloc);

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

  763.         if (s->frames[i].data[0])

  764.             avctx->release_buffer(avctx, &s->frames[i]);

  765.     }

  766.     return 0;

  767. }