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FFmpeg/libavcodec/vp8.c

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  1. /**

  2.  * VP8 compatible video decoder

  3.  *

  4.  * Copyright (C) 2010 David Conrad

  5.  * Copyright (C) 2010 Ronald S. Bultje

  6.  * Copyright (C) 2010 Jason Garrett-Glaser

  7.  *

  8.  * This file is part of FFmpeg.

  9.  *

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

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

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

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

  14.  *

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

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

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

  18.  * Lesser General Public License for more details.

  19.  *

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

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

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

  23.  */

  24. 

  25. #include "libavutil/imgutils.h"

  26. #include "avcodec.h"

  27. #include "vp8.h"

  28. #include "vp8data.h"

  29. #include "rectangle.h"

  30. 

  31. #if ARCH_ARM

  32. #   include "arm/vp8.h"

  33. #endif

  34. 

  35. static void vp8_decode_flush(AVCodecContext *avctx)

  36. {

  37.     VP8Context *s = avctx->priv_data;

  38.     int i;

  39. 

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

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

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

  43.     memset(s->framep, 0, sizeof(s->framep));

  44. 

  45.     av_freep(&s->macroblocks_base);

  46.     av_freep(&s->filter_strength);

  47.     av_freep(&s->intra4x4_pred_mode_top);

  48.     av_freep(&s->top_nnz);

  49.     av_freep(&s->edge_emu_buffer);

  50.     av_freep(&s->top_border);

  51.     av_freep(&s->segmentation_map);

  52. 

  53.     s->macroblocks        = NULL;

  54. }

  55. 

  56. static int update_dimensions(VP8Context *s, int width, int height)

  57. {

  58.     if (av_image_check_size(width, height, 0, s->avctx))

  59.         return AVERROR_INVALIDDATA;

  60. 

  61.     vp8_decode_flush(s->avctx);

  62. 

  63.     avcodec_set_dimensions(s->avctx, width, height);

  64. 

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

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

  67. 

  68.     s->macroblocks_base        = av_mallocz((s->mb_width+s->mb_height*2+1)*sizeof(*s->macroblocks));

  69.     s->filter_strength         = av_mallocz(s->mb_width*sizeof(*s->filter_strength));

  70.     s->intra4x4_pred_mode_top  = av_mallocz(s->mb_width*4);

  71.     s->top_nnz                 = av_mallocz(s->mb_width*sizeof(*s->top_nnz));

  72.     s->top_border              = av_mallocz((s->mb_width+1)*sizeof(*s->top_border));

  73.     s->segmentation_map        = av_mallocz(s->mb_width*s->mb_height);

  74. 

  75.     if (!s->macroblocks_base || !s->filter_strength || !s->intra4x4_pred_mode_top ||

  76.         !s->top_nnz || !s->top_border || !s->segmentation_map)

  77.         return AVERROR(ENOMEM);

  78. 

  79.     s->macroblocks        = s->macroblocks_base + 1;

  80. 

  81.     return 0;

  82. }

  83. 

  84. static void parse_segment_info(VP8Context *s)

  85. {

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

  87.     int i;

  88. 

  89.     s->segmentation.update_map = vp8_rac_get(c);

  90. 

  91.     if (vp8_rac_get(c)) { // update segment feature data

  92.         s->segmentation.absolute_vals = vp8_rac_get(c);

  93. 

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

  95.             s->segmentation.base_quant[i]   = vp8_rac_get_sint(c, 7);

  96. 

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

  98.             s->segmentation.filter_level[i] = vp8_rac_get_sint(c, 6);

  99.     }

  100.     if (s->segmentation.update_map)

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

  102.             s->prob->segmentid[i] = vp8_rac_get(c) ? vp8_rac_get_uint(c, 8) : 255;

  103. }

  104. 

  105. static void update_lf_deltas(VP8Context *s)

  106. {

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

  108.     int i;

  109. 

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

  111.         s->lf_delta.ref[i]  = vp8_rac_get_sint(c, 6);

  112. 

  113.     for (i = MODE_I4x4; i <= VP8_MVMODE_SPLIT; i++)

  114.         s->lf_delta.mode[i] = vp8_rac_get_sint(c, 6);

  115. }

  116. 

  117. static int setup_partitions(VP8Context *s, const uint8_t *buf, int buf_size)

  118. {

  119.     const uint8_t *sizes = buf;

  120.     int i;

  121. 

  122.     s->num_coeff_partitions = 1 << vp8_rac_get_uint(&s->c, 2);

  123. 

  124.     buf      += 3*(s->num_coeff_partitions-1);

  125.     buf_size -= 3*(s->num_coeff_partitions-1);

  126.     if (buf_size < 0)

  127.         return -1;

  128. 

  129.     for (i = 0; i < s->num_coeff_partitions-1; i++) {

  130.         int size = AV_RL24(sizes + 3*i);

  131.         if (buf_size - size < 0)

  132.             return -1;

  133. 

  134.         ff_vp56_init_range_decoder(&s->coeff_partition[i], buf, size);

  135.         buf      += size;

  136.         buf_size -= size;

  137.     }

  138.     ff_vp56_init_range_decoder(&s->coeff_partition[i], buf, buf_size);

  139. 

  140.     return 0;

  141. }

  142. 

  143. static void get_quants(VP8Context *s)

  144. {

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

  146.     int i, base_qi;

  147. 

  148.     int yac_qi     = vp8_rac_get_uint(c, 7);

  149.     int ydc_delta  = vp8_rac_get_sint(c, 4);

  150.     int y2dc_delta = vp8_rac_get_sint(c, 4);

  151.     int y2ac_delta = vp8_rac_get_sint(c, 4);

  152.     int uvdc_delta = vp8_rac_get_sint(c, 4);

  153.     int uvac_delta = vp8_rac_get_sint(c, 4);

  154. 

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

  156.         if (s->segmentation.enabled) {

  157.             base_qi = s->segmentation.base_quant[i];

  158.             if (!s->segmentation.absolute_vals)

  159.                 base_qi += yac_qi;

  160.         } else

  161.             base_qi = yac_qi;

  162. 

  163.         s->qmat[i].luma_qmul[0]    =       vp8_dc_qlookup[av_clip(base_qi + ydc_delta , 0, 127)];

  164.         s->qmat[i].luma_qmul[1]    =       vp8_ac_qlookup[av_clip(base_qi             , 0, 127)];

  165.         s->qmat[i].luma_dc_qmul[0] =   2 * vp8_dc_qlookup[av_clip(base_qi + y2dc_delta, 0, 127)];

  166.         s->qmat[i].luma_dc_qmul[1] = 155 * vp8_ac_qlookup[av_clip(base_qi + y2ac_delta, 0, 127)] / 100;

  167.         s->qmat[i].chroma_qmul[0]  =       vp8_dc_qlookup[av_clip(base_qi + uvdc_delta, 0, 127)];

  168.         s->qmat[i].chroma_qmul[1]  =       vp8_ac_qlookup[av_clip(base_qi + uvac_delta, 0, 127)];

  169. 

  170.         s->qmat[i].luma_dc_qmul[1] = FFMAX(s->qmat[i].luma_dc_qmul[1], 8);

  171.         s->qmat[i].chroma_qmul[0]  = FFMIN(s->qmat[i].chroma_qmul[0], 132);

  172.     }

  173. }

  174. 

  175. /**

  176.  * Determine which buffers golden and altref should be updated with after this frame.

  177.  * The spec isn't clear here, so I'm going by my understanding of what libvpx does

  178.  *

  179.  * Intra frames update all 3 references

  180.  * Inter frames update VP56_FRAME_PREVIOUS if the update_last flag is set

  181.  * If the update (golden|altref) flag is set, it's updated with the current frame

  182.  *      if update_last is set, and VP56_FRAME_PREVIOUS otherwise.

  183.  * If the flag is not set, the number read means:

  184.  *      0: no update

  185.  *      1: VP56_FRAME_PREVIOUS

  186.  *      2: update golden with altref, or update altref with golden

  187.  */

  188. static VP56Frame ref_to_update(VP8Context *s, int update, VP56Frame ref)

  189. {

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

  191. 

  192.     if (update)

  193.         return VP56_FRAME_CURRENT;

  194. 

  195.     switch (vp8_rac_get_uint(c, 2)) {

  196.     case 1:

  197.         return VP56_FRAME_PREVIOUS;

  198.     case 2:

  199.         return (ref == VP56_FRAME_GOLDEN) ? VP56_FRAME_GOLDEN2 : VP56_FRAME_GOLDEN;

  200.     }

  201.     return VP56_FRAME_NONE;

  202. }

  203. 

  204. static void update_refs(VP8Context *s)

  205. {

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

  207. 

  208.     int update_golden = vp8_rac_get(c);

  209.     int update_altref = vp8_rac_get(c);

  210. 

  211.     s->update_golden = ref_to_update(s, update_golden, VP56_FRAME_GOLDEN);

  212.     s->update_altref = ref_to_update(s, update_altref, VP56_FRAME_GOLDEN2);

  213. }

  214. 

  215. static int decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_size)

  216. {

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

  218.     int header_size, hscale, vscale, i, j, k, l, m, ret;

  219.     int width  = s->avctx->width;

  220.     int height = s->avctx->height;

  221. 

  222.     s->keyframe  = !(buf[0] & 1);

  223.     s->profile   =  (buf[0]>>1) & 7;

  224.     s->invisible = !(buf[0] & 0x10);

  225.     header_size  = AV_RL24(buf) >> 5;

  226.     buf      += 3;

  227.     buf_size -= 3;

  228. 

  229.     if (s->profile > 3)

  230.         av_log(s->avctx, AV_LOG_WARNING, "Unknown profile %d\n", s->profile);

  231. 

  232.     if (!s->profile)

  233.         memcpy(s->put_pixels_tab, s->vp8dsp.put_vp8_epel_pixels_tab, sizeof(s->put_pixels_tab));

  234.     else    // profile 1-3 use bilinear, 4+ aren't defined so whatever

  235.         memcpy(s->put_pixels_tab, s->vp8dsp.put_vp8_bilinear_pixels_tab, sizeof(s->put_pixels_tab));

  236. 

  237.     if (header_size > buf_size - 7*s->keyframe) {

  238.         av_log(s->avctx, AV_LOG_ERROR, "Header size larger than data provided\n");

  239.         return AVERROR_INVALIDDATA;

  240.     }

  241. 

  242.     if (s->keyframe) {

  243.         if (AV_RL24(buf) != 0x2a019d) {

  244.             av_log(s->avctx, AV_LOG_ERROR, "Invalid start code 0x%x\n", AV_RL24(buf));

  245.             return AVERROR_INVALIDDATA;

  246.         }

  247.         width  = AV_RL16(buf+3) & 0x3fff;

  248.         height = AV_RL16(buf+5) & 0x3fff;

  249.         hscale = buf[4] >> 6;

  250.         vscale = buf[6] >> 6;

  251.         buf      += 7;

  252.         buf_size -= 7;

  253. 

  254.         if (hscale || vscale)

  255.             av_log_missing_feature(s->avctx, "Upscaling", 1);

  256. 

  257.         s->update_golden = s->update_altref = VP56_FRAME_CURRENT;

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

  259.             for (j = 0; j < 16; j++)

  260.                 memcpy(s->prob->token[i][j], vp8_token_default_probs[i][vp8_coeff_band[j]],

  261.                        sizeof(s->prob->token[i][j]));

  262.         memcpy(s->prob->pred16x16, vp8_pred16x16_prob_inter, sizeof(s->prob->pred16x16));

  263.         memcpy(s->prob->pred8x8c , vp8_pred8x8c_prob_inter , sizeof(s->prob->pred8x8c));

  264.         memcpy(s->prob->mvc      , vp8_mv_default_prob     , sizeof(s->prob->mvc));

  265.         memset(&s->segmentation, 0, sizeof(s->segmentation));

  266.     }

  267. 

  268.     if (!s->macroblocks_base || /* first frame */

  269.         width != s->avctx->width || height != s->avctx->height) {

  270.         if ((ret = update_dimensions(s, width, height) < 0))

  271.             return ret;

  272.     }

  273. 

  274.     ff_vp56_init_range_decoder(c, buf, header_size);

  275.     buf      += header_size;

  276.     buf_size -= header_size;

  277. 

  278.     if (s->keyframe) {

  279.         if (vp8_rac_get(c))

  280.             av_log(s->avctx, AV_LOG_WARNING, "Unspecified colorspace\n");

  281.         vp8_rac_get(c); // whether we can skip clamping in dsp functions

  282.     }

  283. 

  284.     if ((s->segmentation.enabled = vp8_rac_get(c)))

  285.         parse_segment_info(s);

  286.     else

  287.         s->segmentation.update_map = 0; // FIXME: move this to some init function?

  288. 

  289.     s->filter.simple    = vp8_rac_get(c);

  290.     s->filter.level     = vp8_rac_get_uint(c, 6);

  291.     s->filter.sharpness = vp8_rac_get_uint(c, 3);

  292. 

  293.     if ((s->lf_delta.enabled = vp8_rac_get(c)))

  294.         if (vp8_rac_get(c))

  295.             update_lf_deltas(s);

  296. 

  297.     if (setup_partitions(s, buf, buf_size)) {

  298.         av_log(s->avctx, AV_LOG_ERROR, "Invalid partitions\n");

  299.         return AVERROR_INVALIDDATA;

  300.     }

  301. 

  302.     get_quants(s);

  303. 

  304.     if (!s->keyframe) {

  305.         update_refs(s);

  306.         s->sign_bias[VP56_FRAME_GOLDEN]               = vp8_rac_get(c);

  307.         s->sign_bias[VP56_FRAME_GOLDEN2 /* altref */] = vp8_rac_get(c);

  308.     }

  309. 

  310.     // if we aren't saving this frame's probabilities for future frames,

  311.     // make a copy of the current probabilities

  312.     if (!(s->update_probabilities = vp8_rac_get(c)))

  313.         s->prob[1] = s->prob[0];

  314. 

  315.     s->update_last = s->keyframe || vp8_rac_get(c);

  316. 

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

  318.         for (j = 0; j < 8; j++)

  319.             for (k = 0; k < 3; k++)

  320.                 for (l = 0; l < NUM_DCT_TOKENS-1; l++)

  321.                     if (vp56_rac_get_prob_branchy(c, vp8_token_update_probs[i][j][k][l])) {

  322.                         int prob = vp8_rac_get_uint(c, 8);

  323.                         for (m = 0; vp8_coeff_band_indexes[j][m] >= 0; m++)

  324.                             s->prob->token[i][vp8_coeff_band_indexes[j][m]][k][l] = prob;

  325.                     }

  326. 

  327.     if ((s->mbskip_enabled = vp8_rac_get(c)))

  328.         s->prob->mbskip = vp8_rac_get_uint(c, 8);

  329. 

  330.     if (!s->keyframe) {

  331.         s->prob->intra  = vp8_rac_get_uint(c, 8);

  332.         s->prob->last   = vp8_rac_get_uint(c, 8);

  333.         s->prob->golden = vp8_rac_get_uint(c, 8);

  334. 

  335.         if (vp8_rac_get(c))

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

  337.                 s->prob->pred16x16[i] = vp8_rac_get_uint(c, 8);

  338.         if (vp8_rac_get(c))

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

  340.                 s->prob->pred8x8c[i]  = vp8_rac_get_uint(c, 8);

  341. 

  342.         // 17.2 MV probability update

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

  344.             for (j = 0; j < 19; j++)

  345.                 if (vp56_rac_get_prob_branchy(c, vp8_mv_update_prob[i][j]))

  346.                     s->prob->mvc[i][j] = vp8_rac_get_nn(c);

  347.     }

  348. 

  349.     return 0;

  350. }

  351. 

  352. static av_always_inline void clamp_mv(VP8Context *s, VP56mv *dst, const VP56mv *src)

  353. {

  354.     dst->x = av_clip(src->x, s->mv_min.x, s->mv_max.x);

  355.     dst->y = av_clip(src->y, s->mv_min.y, s->mv_max.y);

  356. }

  357. 

  358. /**

  359.  * Motion vector coding, 17.1.

  360.  */

  361. static int read_mv_component(VP56RangeCoder *c, const uint8_t *p)

  362. {

  363.     int bit, x = 0;

  364. 

  365.     if (vp56_rac_get_prob_branchy(c, p[0])) {

  366.         int i;

  367. 

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

  369.             x += vp56_rac_get_prob(c, p[9 + i]) << i;

  370.         for (i = 9; i > 3; i--)

  371.             x += vp56_rac_get_prob(c, p[9 + i]) << i;

  372.         if (!(x & 0xFFF0) || vp56_rac_get_prob(c, p[12]))

  373.             x += 8;

  374.     } else {

  375.         // small_mvtree

  376.         const uint8_t *ps = p+2;

  377.         bit = vp56_rac_get_prob(c, *ps);

  378.         ps += 1 + 3*bit;

  379.         x  += 4*bit;

  380.         bit = vp56_rac_get_prob(c, *ps);

  381.         ps += 1 + bit;

  382.         x  += 2*bit;

  383.         x  += vp56_rac_get_prob(c, *ps);

  384.     }

  385. 

  386.     return (x && vp56_rac_get_prob(c, p[1])) ? -x : x;

  387. }

  388. 

  389. static av_always_inline

  390. const uint8_t *get_submv_prob(uint32_t left, uint32_t top)

  391. {

  392.     if (left == top)

  393.         return vp8_submv_prob[4-!!left];

  394.     if (!top)

  395.         return vp8_submv_prob[2];

  396.     return vp8_submv_prob[1-!!left];

  397. }

  398. 

  399. /**

  400.  * Split motion vector prediction, 16.4.

  401.  * @returns the number of motion vectors parsed (2, 4 or 16)

  402.  */

  403. static av_always_inline

  404. int decode_splitmvs(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb)

  405. {

  406.     int part_idx;

  407.     int n, num;

  408.     VP8Macroblock *top_mb  = &mb[2];

  409.     VP8Macroblock *left_mb = &mb[-1];

  410.     const uint8_t *mbsplits_left = vp8_mbsplits[left_mb->partitioning],

  411.                   *mbsplits_top = vp8_mbsplits[top_mb->partitioning],

  412.                   *mbsplits_cur, *firstidx;

  413.     VP56mv *top_mv  = top_mb->bmv;

  414.     VP56mv *left_mv = left_mb->bmv;

  415.     VP56mv *cur_mv  = mb->bmv;

  416. 

  417.     if (vp56_rac_get_prob_branchy(c, vp8_mbsplit_prob[0])) {

  418.         if (vp56_rac_get_prob_branchy(c, vp8_mbsplit_prob[1])) {

  419.             part_idx = VP8_SPLITMVMODE_16x8 + vp56_rac_get_prob(c, vp8_mbsplit_prob[2]);

  420.         } else {

  421.             part_idx = VP8_SPLITMVMODE_8x8;

  422.         }

  423.     } else {

  424.         part_idx = VP8_SPLITMVMODE_4x4;

  425.     }

  426. 

  427.     num = vp8_mbsplit_count[part_idx];

  428.     mbsplits_cur = vp8_mbsplits[part_idx],

  429.     firstidx = vp8_mbfirstidx[part_idx];

  430.     mb->partitioning = part_idx;

  431. 

  432.     for (n = 0; n < num; n++) {

  433.         int k = firstidx[n];

  434.         uint32_t left, above;

  435.         const uint8_t *submv_prob;

  436. 

  437.         if (!(k & 3))

  438.             left = AV_RN32A(&left_mv[mbsplits_left[k + 3]]);

  439.         else

  440.             left  = AV_RN32A(&cur_mv[mbsplits_cur[k - 1]]);

  441.         if (k <= 3)

  442.             above = AV_RN32A(&top_mv[mbsplits_top[k + 12]]);

  443.         else

  444.             above = AV_RN32A(&cur_mv[mbsplits_cur[k - 4]]);

  445. 

  446.         submv_prob = get_submv_prob(left, above);

  447. 

  448.         if (vp56_rac_get_prob_branchy(c, submv_prob[0])) {

  449.             if (vp56_rac_get_prob_branchy(c, submv_prob[1])) {

  450.                 if (vp56_rac_get_prob_branchy(c, submv_prob[2])) {

  451.                     mb->bmv[n].y = mb->mv.y + read_mv_component(c, s->prob->mvc[0]);

  452.                     mb->bmv[n].x = mb->mv.x + read_mv_component(c, s->prob->mvc[1]);

  453.                 } else {

  454.                     AV_ZERO32(&mb->bmv[n]);

  455.                 }

  456.             } else {

  457.                 AV_WN32A(&mb->bmv[n], above);

  458.             }

  459.         } else {

  460.             AV_WN32A(&mb->bmv[n], left);

  461.         }

  462.     }

  463. 

  464.     return num;

  465. }

  466. 

  467. static av_always_inline

  468. void decode_mvs(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y)

  469. {

  470.     VP8Macroblock *mb_edge[3] = { mb + 2 /* top */,

  471.                                   mb - 1 /* left */,

  472.                                   mb + 1 /* top-left */ };

  473.     enum { CNT_ZERO, CNT_NEAREST, CNT_NEAR, CNT_SPLITMV };

  474.     enum { EDGE_TOP, EDGE_LEFT, EDGE_TOPLEFT };

  475.     int idx = CNT_ZERO;

  476.     int cur_sign_bias = s->sign_bias[mb->ref_frame];

  477.     int *sign_bias = s->sign_bias;

  478.     VP56mv near_mv[4];

  479.     uint8_t cnt[4] = { 0 };

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

  481. 

  482.     AV_ZERO32(&near_mv[0]);

  483.     AV_ZERO32(&near_mv[1]);

  484. 

  485.     /* Process MB on top, left and top-left */

  486.     #define MV_EDGE_CHECK(n)\

  487.     {\

  488.         VP8Macroblock *edge = mb_edge[n];\

  489.         int edge_ref = edge->ref_frame;\

  490.         if (edge_ref != VP56_FRAME_CURRENT) {\

  491.             uint32_t mv = AV_RN32A(&edge->mv);\

  492.             if (mv) {\

  493.                 if (cur_sign_bias != sign_bias[edge_ref]) {\

  494.                     /* SWAR negate of the values in mv. */\

  495.                     mv = ~mv;\

  496.                     mv = ((mv&0x7fff7fff) + 0x00010001) ^ (mv&0x80008000);\

  497.                 }\

  498.                 if (!n || mv != AV_RN32A(&near_mv[idx]))\

  499.                     AV_WN32A(&near_mv[++idx], mv);\

  500.                 cnt[idx]      += 1 + (n != 2);\

  501.             } else\

  502.                 cnt[CNT_ZERO] += 1 + (n != 2);\

  503.         }\

  504.     }

  505. 

  506.     MV_EDGE_CHECK(0)

  507.     MV_EDGE_CHECK(1)

  508.     MV_EDGE_CHECK(2)

  509. 

  510.     mb->partitioning = VP8_SPLITMVMODE_NONE;

  511.     if (vp56_rac_get_prob_branchy(c, vp8_mode_contexts[cnt[CNT_ZERO]][0])) {

  512.         mb->mode = VP8_MVMODE_MV;

  513. 

  514.         /* If we have three distinct MVs, merge first and last if they're the same */

  515.         if (cnt[CNT_SPLITMV] && AV_RN32A(&near_mv[1+EDGE_TOP]) == AV_RN32A(&near_mv[1+EDGE_TOPLEFT]))

  516.             cnt[CNT_NEAREST] += 1;

  517. 

  518.         /* Swap near and nearest if necessary */

  519.         if (cnt[CNT_NEAR] > cnt[CNT_NEAREST]) {

  520.             FFSWAP(uint8_t,     cnt[CNT_NEAREST],     cnt[CNT_NEAR]);

  521.             FFSWAP( VP56mv, near_mv[CNT_NEAREST], near_mv[CNT_NEAR]);

  522.         }

  523. 

  524.         if (vp56_rac_get_prob_branchy(c, vp8_mode_contexts[cnt[CNT_NEAREST]][1])) {

  525.             if (vp56_rac_get_prob_branchy(c, vp8_mode_contexts[cnt[CNT_NEAR]][2])) {

  526. 

  527.                 /* Choose the best mv out of 0,0 and the nearest mv */

  528.                 clamp_mv(s, &mb->mv, &near_mv[CNT_ZERO + (cnt[CNT_NEAREST] >= cnt[CNT_ZERO])]);

  529.                 cnt[CNT_SPLITMV] = ((mb_edge[EDGE_LEFT]->mode    == VP8_MVMODE_SPLIT) +

  530.                                     (mb_edge[EDGE_TOP]->mode     == VP8_MVMODE_SPLIT)) * 2 +

  531.                                     (mb_edge[EDGE_TOPLEFT]->mode == VP8_MVMODE_SPLIT);

  532. 

  533.                 if (vp56_rac_get_prob_branchy(c, vp8_mode_contexts[cnt[CNT_SPLITMV]][3])) {

  534.                     mb->mode = VP8_MVMODE_SPLIT;

  535.                     mb->mv = mb->bmv[decode_splitmvs(s, c, mb) - 1];

  536.                 } else {

  537.                     mb->mv.y += read_mv_component(c, s->prob->mvc[0]);

  538.                     mb->mv.x += read_mv_component(c, s->prob->mvc[1]);

  539.                     mb->bmv[0] = mb->mv;

  540.                 }

  541.             } else {

  542.                 clamp_mv(s, &mb->mv, &near_mv[CNT_NEAR]);

  543.                 mb->bmv[0] = mb->mv;

  544.             }

  545.         } else {

  546.             clamp_mv(s, &mb->mv, &near_mv[CNT_NEAREST]);

  547.             mb->bmv[0] = mb->mv;

  548.         }

  549.     } else {

  550.         mb->mode = VP8_MVMODE_ZERO;

  551.         AV_ZERO32(&mb->mv);

  552.         mb->bmv[0] = mb->mv;

  553.     }

  554. }

  555. 

  556. static av_always_inline

  557. void decode_intra4x4_modes(VP8Context *s, VP56RangeCoder *c,

  558.                            int mb_x, int keyframe)

  559. {

  560.     uint8_t *intra4x4 = s->intra4x4_pred_mode_mb;

  561.     if (keyframe) {

  562.         int x, y;

  563.         uint8_t* const top = s->intra4x4_pred_mode_top + 4 * mb_x;

  564.         uint8_t* const left = s->intra4x4_pred_mode_left;

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

  566.             for (x = 0; x < 4; x++) {

  567.                 const uint8_t *ctx;

  568.                 ctx = vp8_pred4x4_prob_intra[top[x]][left[y]];

  569.                 *intra4x4 = vp8_rac_get_tree(c, vp8_pred4x4_tree, ctx);

  570.                 left[y] = top[x] = *intra4x4;

  571.                 intra4x4++;

  572.             }

  573.         }

  574.     } else {

  575.         int i;

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

  577.             intra4x4[i] = vp8_rac_get_tree(c, vp8_pred4x4_tree, vp8_pred4x4_prob_inter);

  578.     }

  579. }

  580. 

  581. static av_always_inline

  582. void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y, uint8_t *segment)

  583. {

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

  585. 

  586.     if (s->segmentation.update_map)

  587.         *segment = vp8_rac_get_tree(c, vp8_segmentid_tree, s->prob->segmentid);

  588.     s->segment = *segment;

  589. 

  590.     mb->skip = s->mbskip_enabled ? vp56_rac_get_prob(c, s->prob->mbskip) : 0;

  591. 

  592.     if (s->keyframe) {

  593.         mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_intra, vp8_pred16x16_prob_intra);

  594. 

  595.         if (mb->mode == MODE_I4x4) {

  596.             decode_intra4x4_modes(s, c, mb_x, 1);

  597.         } else {

  598.             const uint32_t modes = vp8_pred4x4_mode[mb->mode] * 0x01010101u;

  599.             AV_WN32A(s->intra4x4_pred_mode_top + 4 * mb_x, modes);

  600.             AV_WN32A(s->intra4x4_pred_mode_left, modes);

  601.         }

  602. 

  603.         s->chroma_pred_mode = vp8_rac_get_tree(c, vp8_pred8x8c_tree, vp8_pred8x8c_prob_intra);

  604.         mb->ref_frame = VP56_FRAME_CURRENT;

  605.     } else if (vp56_rac_get_prob_branchy(c, s->prob->intra)) {

  606.         // inter MB, 16.2

  607.         if (vp56_rac_get_prob_branchy(c, s->prob->last))

  608.             mb->ref_frame = vp56_rac_get_prob(c, s->prob->golden) ?

  609.                 VP56_FRAME_GOLDEN2 /* altref */ : VP56_FRAME_GOLDEN;

  610.         else

  611.             mb->ref_frame = VP56_FRAME_PREVIOUS;

  612.         s->ref_count[mb->ref_frame-1]++;

  613. 

  614.         // motion vectors, 16.3

  615.         decode_mvs(s, mb, mb_x, mb_y);

  616.     } else {

  617.         // intra MB, 16.1

  618.         mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_inter, s->prob->pred16x16);

  619. 

  620.         if (mb->mode == MODE_I4x4)

  621.             decode_intra4x4_modes(s, c, mb_x, 0);

  622. 

  623.         s->chroma_pred_mode = vp8_rac_get_tree(c, vp8_pred8x8c_tree, s->prob->pred8x8c);

  624.         mb->ref_frame = VP56_FRAME_CURRENT;

  625.         mb->partitioning = VP8_SPLITMVMODE_NONE;

  626.         AV_ZERO32(&mb->bmv[0]);

  627.     }

  628. }

  629. 

  630. #ifndef decode_block_coeffs_internal

  631. /**

  632.  * @param c arithmetic bitstream reader context

  633.  * @param block destination for block coefficients

  634.  * @param probs probabilities to use when reading trees from the bitstream

  635.  * @param i initial coeff index, 0 unless a separate DC block is coded

  636.  * @param zero_nhood the initial prediction context for number of surrounding

  637.  *                   all-zero blocks (only left/top, so 0-2)

  638.  * @param qmul array holding the dc/ac dequant factor at position 0/1

  639.  * @return 0 if no coeffs were decoded

  640.  *         otherwise, the index of the last coeff decoded plus one

  641.  */

  642. static int decode_block_coeffs_internal(VP56RangeCoder *c, DCTELEM block[16],

  643.                                         uint8_t probs[8][3][NUM_DCT_TOKENS-1],

  644.                                         int i, uint8_t *token_prob, int16_t qmul[2])

  645. {

  646.     goto skip_eob;

  647.     do {

  648.         int coeff;

  649.         if (!vp56_rac_get_prob_branchy(c, token_prob[0]))   // DCT_EOB

  650.             return i;

  651. 

  652. skip_eob:

  653.         if (!vp56_rac_get_prob_branchy(c, token_prob[1])) { // DCT_0

  654.             if (++i == 16)

  655.                 return i; // invalid input; blocks should end with EOB

  656.             token_prob = probs[i][0];

  657.             goto skip_eob;

  658.         }

  659. 

  660.         if (!vp56_rac_get_prob_branchy(c, token_prob[2])) { // DCT_1

  661.             coeff = 1;

  662.             token_prob = probs[i+1][1];

  663.         } else {

  664.             if (!vp56_rac_get_prob_branchy(c, token_prob[3])) { // DCT 2,3,4

  665.                 coeff = vp56_rac_get_prob_branchy(c, token_prob[4]);

  666.                 if (coeff)

  667.                     coeff += vp56_rac_get_prob(c, token_prob[5]);

  668.                 coeff += 2;

  669.             } else {

  670.                 // DCT_CAT*

  671.                 if (!vp56_rac_get_prob_branchy(c, token_prob[6])) {

  672.                     if (!vp56_rac_get_prob_branchy(c, token_prob[7])) { // DCT_CAT1

  673.                         coeff  = 5 + vp56_rac_get_prob(c, vp8_dct_cat1_prob[0]);

  674.                     } else {                                    // DCT_CAT2

  675.                         coeff  = 7;

  676.                         coeff += vp56_rac_get_prob(c, vp8_dct_cat2_prob[0]) << 1;

  677.                         coeff += vp56_rac_get_prob(c, vp8_dct_cat2_prob[1]);

  678.                     }

  679.                 } else {    // DCT_CAT3 and up

  680.                     int a = vp56_rac_get_prob(c, token_prob[8]);

  681.                     int b = vp56_rac_get_prob(c, token_prob[9+a]);

  682.                     int cat = (a<<1) + b;

  683.                     coeff  = 3 + (8<<cat);

  684.                     coeff += vp8_rac_get_coeff(c, ff_vp8_dct_cat_prob[cat]);

  685.                 }

  686.             }

  687.             token_prob = probs[i+1][2];

  688.         }

  689.         block[zigzag_scan[i]] = (vp8_rac_get(c) ? -coeff : coeff) * qmul[!!i];

  690.     } while (++i < 16);

  691. 

  692.     return i;

  693. }

  694. #endif

  695. 

  696. static av_always_inline

  697. int decode_block_coeffs(VP56RangeCoder *c, DCTELEM block[16],

  698.                         uint8_t probs[8][3][NUM_DCT_TOKENS-1],

  699.                         int i, int zero_nhood, int16_t qmul[2])

  700. {

  701.     uint8_t *token_prob = probs[i][zero_nhood];

  702.     if (!vp56_rac_get_prob_branchy(c, token_prob[0]))   // DCT_EOB

  703.         return 0;

  704.     return decode_block_coeffs_internal(c, block, probs, i, token_prob, qmul);

  705. }

  706. 

  707. static av_always_inline

  708. void decode_mb_coeffs(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb,

  709.                       uint8_t t_nnz[9], uint8_t l_nnz[9])

  710. {

  711.     int i, x, y, luma_start = 0, luma_ctx = 3;

  712.     int nnz_pred, nnz, nnz_total = 0;

  713.     int segment = s->segment;

  714.     int block_dc = 0;

  715. 

  716.     if (mb->mode != MODE_I4x4 && mb->mode != VP8_MVMODE_SPLIT) {

  717.         nnz_pred = t_nnz[8] + l_nnz[8];

  718. 

  719.         // decode DC values and do hadamard

  720.         nnz = decode_block_coeffs(c, s->block_dc, s->prob->token[1], 0, nnz_pred,

  721.                                   s->qmat[segment].luma_dc_qmul);

  722.         l_nnz[8] = t_nnz[8] = !!nnz;

  723.         if (nnz) {

  724.             nnz_total += nnz;

  725.             block_dc = 1;

  726.             if (nnz == 1)

  727.                 s->vp8dsp.vp8_luma_dc_wht_dc(s->block, s->block_dc);

  728.             else

  729.                 s->vp8dsp.vp8_luma_dc_wht(s->block, s->block_dc);

  730.         }

  731.         luma_start = 1;

  732.         luma_ctx = 0;

  733.     }

  734. 

  735.     // luma blocks

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

  737.         for (x = 0; x < 4; x++) {

  738.             nnz_pred = l_nnz[y] + t_nnz[x];

  739.             nnz = decode_block_coeffs(c, s->block[y][x], s->prob->token[luma_ctx], luma_start,

  740.                                       nnz_pred, s->qmat[segment].luma_qmul);

  741.             // nnz+block_dc may be one more than the actual last index, but we don't care

  742.             s->non_zero_count_cache[y][x] = nnz + block_dc;

  743.             t_nnz[x] = l_nnz[y] = !!nnz;

  744.             nnz_total += nnz;

  745.         }

  746. 

  747.     // chroma blocks

  748.     // TODO: what to do about dimensions? 2nd dim for luma is x,

  749.     // but for chroma it's (y<<1)|x

  750.     for (i = 4; i < 6; i++)

  751.         for (y = 0; y < 2; y++)

  752.             for (x = 0; x < 2; x++) {

  753.                 nnz_pred = l_nnz[i+2*y] + t_nnz[i+2*x];

  754.                 nnz = decode_block_coeffs(c, s->block[i][(y<<1)+x], s->prob->token[2], 0,

  755.                                           nnz_pred, s->qmat[segment].chroma_qmul);

  756.                 s->non_zero_count_cache[i][(y<<1)+x] = nnz;

  757.                 t_nnz[i+2*x] = l_nnz[i+2*y] = !!nnz;

  758.                 nnz_total += nnz;

  759.             }

  760. 

  761.     // if there were no coded coeffs despite the macroblock not being marked skip,

  762.     // we MUST not do the inner loop filter and should not do IDCT

  763.     // Since skip isn't used for bitstream prediction, just manually set it.

  764.     if (!nnz_total)

  765.         mb->skip = 1;

  766. }

  767. 

  768. static av_always_inline

  769. void backup_mb_border(uint8_t *top_border, uint8_t *src_y, uint8_t *src_cb, uint8_t *src_cr,

  770.                       int linesize, int uvlinesize, int simple)

  771. {

  772.     AV_COPY128(top_border, src_y + 15*linesize);

  773.     if (!simple) {

  774.         AV_COPY64(top_border+16, src_cb + 7*uvlinesize);

  775.         AV_COPY64(top_border+24, src_cr + 7*uvlinesize);

  776.     }

  777. }

  778. 

  779. static av_always_inline

  780. void xchg_mb_border(uint8_t *top_border, uint8_t *src_y, uint8_t *src_cb, uint8_t *src_cr,

  781.                     int linesize, int uvlinesize, int mb_x, int mb_y, int mb_width,

  782.                     int simple, int xchg)

  783. {

  784.     uint8_t *top_border_m1 = top_border-32;     // for TL prediction

  785.     src_y  -=   linesize;

  786.     src_cb -= uvlinesize;

  787.     src_cr -= uvlinesize;

  788. 

  789. #define XCHG(a,b,xchg) do {                     \

  790.         if (xchg) AV_SWAP64(b,a);               \

  791.         else      AV_COPY64(b,a);               \

  792.     } while (0)

  793. 

  794.     XCHG(top_border_m1+8, src_y-8, xchg);

  795.     XCHG(top_border,      src_y,   xchg);

  796.     XCHG(top_border+8,    src_y+8, 1);

  797.     if (mb_x < mb_width-1)

  798.         XCHG(top_border+32, src_y+16, 1);

  799. 

  800.     // only copy chroma for normal loop filter

  801.     // or to initialize the top row to 127

  802.     if (!simple || !mb_y) {

  803.         XCHG(top_border_m1+16, src_cb-8, xchg);

  804.         XCHG(top_border_m1+24, src_cr-8, xchg);

  805.         XCHG(top_border+16,    src_cb, 1);

  806.         XCHG(top_border+24,    src_cr, 1);

  807.     }

  808. }

  809. 

  810. static av_always_inline

  811. int check_dc_pred8x8_mode(int mode, int mb_x, int mb_y)

  812. {

  813.     if (!mb_x) {

  814.         return mb_y ? TOP_DC_PRED8x8 : DC_128_PRED8x8;

  815.     } else {

  816.         return mb_y ? mode : LEFT_DC_PRED8x8;

  817.     }

  818. }

  819. 

  820. static av_always_inline

  821. int check_tm_pred8x8_mode(int mode, int mb_x, int mb_y)

  822. {

  823.     if (!mb_x) {

  824.         return mb_y ? VERT_PRED8x8 : DC_129_PRED8x8;

  825.     } else {

  826.         return mb_y ? mode : HOR_PRED8x8;

  827.     }

  828. }

  829. 

  830. static av_always_inline

  831. int check_intra_pred8x8_mode(int mode, int mb_x, int mb_y)

  832. {

  833.     if (mode == DC_PRED8x8) {

  834.         return check_dc_pred8x8_mode(mode, mb_x, mb_y);

  835.     } else {

  836.         return mode;

  837.     }

  838. }

  839. 

  840. static av_always_inline

  841. int check_intra_pred8x8_mode_emuedge(int mode, int mb_x, int mb_y)

  842. {

  843.     switch (mode) {

  844.     case DC_PRED8x8:

  845.         return check_dc_pred8x8_mode(mode, mb_x, mb_y);

  846.     case VERT_PRED8x8:

  847.         return !mb_y ? DC_127_PRED8x8 : mode;

  848.     case HOR_PRED8x8:

  849.         return !mb_x ? DC_129_PRED8x8 : mode;

  850.     case PLANE_PRED8x8 /*TM*/:

  851.         return check_tm_pred8x8_mode(mode, mb_x, mb_y);

  852.     }

  853.     return mode;

  854. }

  855. 

  856. static av_always_inline

  857. int check_tm_pred4x4_mode(int mode, int mb_x, int mb_y)

  858. {

  859.     if (!mb_x) {

  860.         return mb_y ? VERT_VP8_PRED : DC_129_PRED;

  861.     } else {

  862.         return mb_y ? mode : HOR_VP8_PRED;

  863.     }

  864. }

  865. 

  866. static av_always_inline

  867. int check_intra_pred4x4_mode_emuedge(int mode, int mb_x, int mb_y, int *copy_buf)

  868. {

  869.     switch (mode) {

  870.     case VERT_PRED:

  871.         if (!mb_x && mb_y) {

  872.             *copy_buf = 1;

  873.             return mode;

  874.         }

  875.         /* fall-through */

  876.     case DIAG_DOWN_LEFT_PRED:

  877.     case VERT_LEFT_PRED:

  878.         return !mb_y ? DC_127_PRED : mode;

  879.     case HOR_PRED:

  880.         if (!mb_y) {

  881.             *copy_buf = 1;

  882.             return mode;

  883.         }

  884.         /* fall-through */

  885.     case HOR_UP_PRED:

  886.         return !mb_x ? DC_129_PRED : mode;

  887.     case TM_VP8_PRED:

  888.         return check_tm_pred4x4_mode(mode, mb_x, mb_y);

  889.     case DC_PRED: // 4x4 DC doesn't use the same "H.264-style" exceptions as 16x16/8x8 DC

  890.     case DIAG_DOWN_RIGHT_PRED:

  891.     case VERT_RIGHT_PRED:

  892.     case HOR_DOWN_PRED:

  893.         if (!mb_y || !mb_x)

  894.             *copy_buf = 1;

  895.         return mode;

  896.     }

  897.     return mode;

  898. }

  899. 

  900. static av_always_inline

  901. void intra_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,

  902.                    int mb_x, int mb_y)

  903. {

  904.     AVCodecContext *avctx = s->avctx;

  905.     int x, y, mode, nnz, tr;

  906. 

  907.     // for the first row, we need to run xchg_mb_border to init the top edge to 127

  908.     // otherwise, skip it if we aren't going to deblock

  909.     if (!(avctx->flags & CODEC_FLAG_EMU_EDGE && !mb_y) && (s->deblock_filter || !mb_y))

  910.         xchg_mb_border(s->top_border[mb_x+1], dst[0], dst[1], dst[2],

  911.                        s->linesize, s->uvlinesize, mb_x, mb_y, s->mb_width,

  912.                        s->filter.simple, 1);

  913. 

  914.     if (mb->mode < MODE_I4x4) {

  915.         if (avctx->flags & CODEC_FLAG_EMU_EDGE) { // tested

  916.             mode = check_intra_pred8x8_mode_emuedge(mb->mode, mb_x, mb_y);

  917.         } else {

  918.             mode = check_intra_pred8x8_mode(mb->mode, mb_x, mb_y);

  919.         }

  920.         s->hpc.pred16x16[mode](dst[0], s->linesize);

  921.     } else {

  922.         uint8_t *ptr = dst[0];

  923.         uint8_t *intra4x4 = s->intra4x4_pred_mode_mb;

  924.         uint8_t tr_top[4] = { 127, 127, 127, 127 };

  925. 

  926.         // all blocks on the right edge of the macroblock use bottom edge

  927.         // the top macroblock for their topright edge

  928.         uint8_t *tr_right = ptr - s->linesize + 16;

  929. 

  930.         // if we're on the right edge of the frame, said edge is extended

  931.         // from the top macroblock

  932.         if (!(!mb_y && avctx->flags & CODEC_FLAG_EMU_EDGE) &&

  933.             mb_x == s->mb_width-1) {

  934.             tr = tr_right[-1]*0x01010101;

  935.             tr_right = (uint8_t *)&tr;

  936.         }

  937. 

  938.         if (mb->skip)

  939.             AV_ZERO128(s->non_zero_count_cache);

  940. 

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

  942.             uint8_t *topright = ptr + 4 - s->linesize;

  943.             for (x = 0; x < 4; x++) {

  944.                 int copy = 0, linesize = s->linesize;

  945.                 uint8_t *dst = ptr+4*x;

  946.                 DECLARE_ALIGNED(4, uint8_t, copy_dst)[5*8];

  947. 

  948.                 if ((y == 0 || x == 3) && mb_y == 0 && avctx->flags & CODEC_FLAG_EMU_EDGE) {

  949.                     topright = tr_top;

  950.                 } else if (x == 3)

  951.                     topright = tr_right;

  952. 

  953.                 if (avctx->flags & CODEC_FLAG_EMU_EDGE) { // mb_x+x or mb_y+y is a hack but works

  954.                     mode = check_intra_pred4x4_mode_emuedge(intra4x4[x], mb_x + x, mb_y + y, &copy);

  955.                     if (copy) {

  956.                         dst = copy_dst + 12;

  957.                         linesize = 8;

  958.                         if (!(mb_y + y)) {

  959.                             copy_dst[3] = 127U;

  960.                             AV_WN32A(copy_dst+4, 127U * 0x01010101U);

  961.                         } else {

  962.                             AV_COPY32(copy_dst+4, ptr+4*x-s->linesize);

  963.                             if (!(mb_x + x)) {

  964.                                 copy_dst[3] = 129U;

  965.                             } else {

  966.                                 copy_dst[3] = ptr[4*x-s->linesize-1];

  967.                             }

  968.                         }

  969.                         if (!(mb_x + x)) {

  970.                             copy_dst[11] =

  971.                             copy_dst[19] =

  972.                             copy_dst[27] =

  973.                             copy_dst[35] = 129U;

  974.                         } else {

  975.                             copy_dst[11] = ptr[4*x              -1];

  976.                             copy_dst[19] = ptr[4*x+s->linesize  -1];

  977.                             copy_dst[27] = ptr[4*x+s->linesize*2-1];

  978.                             copy_dst[35] = ptr[4*x+s->linesize*3-1];

  979.                         }

  980.                     }

  981.                 } else {

  982.                     mode = intra4x4[x];

  983.                 }

  984.                 s->hpc.pred4x4[mode](dst, topright, linesize);

  985.                 if (copy) {

  986.                     AV_COPY32(ptr+4*x              , copy_dst+12);

  987.                     AV_COPY32(ptr+4*x+s->linesize  , copy_dst+20);

  988.                     AV_COPY32(ptr+4*x+s->linesize*2, copy_dst+28);

  989.                     AV_COPY32(ptr+4*x+s->linesize*3, copy_dst+36);

  990.                 }

  991. 

  992.                 nnz = s->non_zero_count_cache[y][x];

  993.                 if (nnz) {

  994.                     if (nnz == 1)

  995.                         s->vp8dsp.vp8_idct_dc_add(ptr+4*x, s->block[y][x], s->linesize);

  996.                     else

  997.                         s->vp8dsp.vp8_idct_add(ptr+4*x, s->block[y][x], s->linesize);

  998.                 }

  999.                 topright += 4;

  1000.             }

  1001. 

  1002.             ptr   += 4*s->linesize;

  1003.             intra4x4 += 4;

  1004.         }

  1005.     }

  1006. 

  1007.     if (avctx->flags & CODEC_FLAG_EMU_EDGE) {

  1008.         mode = check_intra_pred8x8_mode_emuedge(s->chroma_pred_mode, mb_x, mb_y);

  1009.     } else {

  1010.         mode = check_intra_pred8x8_mode(s->chroma_pred_mode, mb_x, mb_y);

  1011.     }

  1012.     s->hpc.pred8x8[mode](dst[1], s->uvlinesize);

  1013.     s->hpc.pred8x8[mode](dst[2], s->uvlinesize);

  1014. 

  1015.     if (!(avctx->flags & CODEC_FLAG_EMU_EDGE && !mb_y) && (s->deblock_filter || !mb_y))

  1016.         xchg_mb_border(s->top_border[mb_x+1], dst[0], dst[1], dst[2],

  1017.                        s->linesize, s->uvlinesize, mb_x, mb_y, s->mb_width,

  1018.                        s->filter.simple, 0);

  1019. }

  1020. 

  1021. static const uint8_t subpel_idx[3][8] = {

  1022.     { 0, 1, 2, 1, 2, 1, 2, 1 }, // nr. of left extra pixels,

  1023.                                 // also function pointer index

  1024.     { 0, 3, 5, 3, 5, 3, 5, 3 }, // nr. of extra pixels required

  1025.     { 0, 2, 3, 2, 3, 2, 3, 2 }, // nr. of right extra pixels

  1026. };

  1027. 

  1028. /**

  1029.  * Generic MC function.

  1030.  *

  1031.  * @param s VP8 decoding context

  1032.  * @param luma 1 for luma (Y) planes, 0 for chroma (Cb/Cr) planes

  1033.  * @param dst target buffer for block data at block position

  1034.  * @param src reference picture buffer at origin (0, 0)

  1035.  * @param mv motion vector (relative to block position) to get pixel data from

  1036.  * @param x_off horizontal position of block from origin (0, 0)

  1037.  * @param y_off vertical position of block from origin (0, 0)

  1038.  * @param block_w width of block (16, 8 or 4)

  1039.  * @param block_h height of block (always same as block_w)

  1040.  * @param width width of src/dst plane data

  1041.  * @param height height of src/dst plane data

  1042.  * @param linesize size of a single line of plane data, including padding

  1043.  * @param mc_func motion compensation function pointers (bilinear or sixtap MC)

  1044.  */

  1045. static av_always_inline

  1046. void vp8_mc_luma(VP8Context *s, uint8_t *dst, uint8_t *src, const VP56mv *mv,

  1047.                  int x_off, int y_off, int block_w, int block_h,

  1048.                  int width, int height, int linesize,

  1049.                  vp8_mc_func mc_func[3][3])

  1050. {

  1051.     if (AV_RN32A(mv)) {

  1052. 

  1053.         int mx = (mv->x << 1)&7, mx_idx = subpel_idx[0][mx];

  1054.         int my = (mv->y << 1)&7, my_idx = subpel_idx[0][my];

  1055. 

  1056.         x_off += mv->x >> 2;

  1057.         y_off += mv->y >> 2;

  1058. 

  1059.         // edge emulation

  1060.         src += y_off * linesize + x_off;

  1061.         if (x_off < mx_idx || x_off >= width  - block_w - subpel_idx[2][mx] ||

  1062.             y_off < my_idx || y_off >= height - block_h - subpel_idx[2][my]) {

  1063.             s->dsp.emulated_edge_mc(s->edge_emu_buffer, src - my_idx * linesize - mx_idx, linesize,

  1064.                                     block_w + subpel_idx[1][mx], block_h + subpel_idx[1][my],

  1065.                                     x_off - mx_idx, y_off - my_idx, width, height);

  1066.             src = s->edge_emu_buffer + mx_idx + linesize * my_idx;

  1067.         }

  1068.         mc_func[my_idx][mx_idx](dst, linesize, src, linesize, block_h, mx, my);

  1069.     } else

  1070.         mc_func[0][0](dst, linesize, src + y_off * linesize + x_off, linesize, block_h, 0, 0);

  1071. }

  1072. 

  1073. static av_always_inline

  1074. void vp8_mc_chroma(VP8Context *s, uint8_t *dst1, uint8_t *dst2, uint8_t *src1,

  1075.                    uint8_t *src2, const VP56mv *mv, int x_off, int y_off,

  1076.                    int block_w, int block_h, int width, int height, int linesize,

  1077.                    vp8_mc_func mc_func[3][3])

  1078. {

  1079.     if (AV_RN32A(mv)) {

  1080.         int mx = mv->x&7, mx_idx = subpel_idx[0][mx];

  1081.         int my = mv->y&7, my_idx = subpel_idx[0][my];

  1082. 

  1083.         x_off += mv->x >> 3;

  1084.         y_off += mv->y >> 3;

  1085. 

  1086.         // edge emulation

  1087.         src1 += y_off * linesize + x_off;

  1088.         src2 += y_off * linesize + x_off;

  1089.         if (x_off < mx_idx || x_off >= width  - block_w - subpel_idx[2][mx] ||

  1090.             y_off < my_idx || y_off >= height - block_h - subpel_idx[2][my]) {

  1091.             s->dsp.emulated_edge_mc(s->edge_emu_buffer, src1 - my_idx * linesize - mx_idx, linesize,

  1092.                                     block_w + subpel_idx[1][mx], block_h + subpel_idx[1][my],

  1093.                                     x_off - mx_idx, y_off - my_idx, width, height);

  1094.             src1 = s->edge_emu_buffer + mx_idx + linesize * my_idx;

  1095.             mc_func[my_idx][mx_idx](dst1, linesize, src1, linesize, block_h, mx, my);

  1096. 

  1097.             s->dsp.emulated_edge_mc(s->edge_emu_buffer, src2 - my_idx * linesize - mx_idx, linesize,

  1098.                                     block_w + subpel_idx[1][mx], block_h + subpel_idx[1][my],

  1099.                                     x_off - mx_idx, y_off - my_idx, width, height);

  1100.             src2 = s->edge_emu_buffer + mx_idx + linesize * my_idx;

  1101.             mc_func[my_idx][mx_idx](dst2, linesize, src2, linesize, block_h, mx, my);

  1102.         } else {

  1103.             mc_func[my_idx][mx_idx](dst1, linesize, src1, linesize, block_h, mx, my);

  1104.             mc_func[my_idx][mx_idx](dst2, linesize, src2, linesize, block_h, mx, my);

  1105.         }

  1106.     } else {

  1107.         mc_func[0][0](dst1, linesize, src1 + y_off * linesize + x_off, linesize, block_h, 0, 0);

  1108.         mc_func[0][0](dst2, linesize, src2 + y_off * linesize + x_off, linesize, block_h, 0, 0);

  1109.     }

  1110. }

  1111. 

  1112. static av_always_inline

  1113. void vp8_mc_part(VP8Context *s, uint8_t *dst[3],

  1114.                  AVFrame *ref_frame, int x_off, int y_off,

  1115.                  int bx_off, int by_off,

  1116.                  int block_w, int block_h,

  1117.                  int width, int height, VP56mv *mv)

  1118. {

  1119.     VP56mv uvmv = *mv;

  1120. 

  1121.     /* Y */

  1122.     vp8_mc_luma(s, dst[0] + by_off * s->linesize + bx_off,

  1123.                 ref_frame->data[0], mv, x_off + bx_off, y_off + by_off,

  1124.                 block_w, block_h, width, height, s->linesize,

  1125.                 s->put_pixels_tab[block_w == 8]);

  1126. 

  1127.     /* U/V */

  1128.     if (s->profile == 3) {

  1129.         uvmv.x &= ~7;

  1130.         uvmv.y &= ~7;

  1131.     }

  1132.     x_off   >>= 1; y_off   >>= 1;

  1133.     bx_off  >>= 1; by_off  >>= 1;

  1134.     width   >>= 1; height  >>= 1;

  1135.     block_w >>= 1; block_h >>= 1;

  1136.     vp8_mc_chroma(s, dst[1] + by_off * s->uvlinesize + bx_off,

  1137.                   dst[2] + by_off * s->uvlinesize + bx_off, ref_frame->data[1],

  1138.                   ref_frame->data[2], &uvmv, x_off + bx_off, y_off + by_off,

  1139.                   block_w, block_h, width, height, s->uvlinesize,

  1140.                   s->put_pixels_tab[1 + (block_w == 4)]);

  1141. }

  1142. 

  1143. /* Fetch pixels for estimated mv 4 macroblocks ahead.

  1144.  * Optimized for 64-byte cache lines.  Inspired by ffh264 prefetch_motion. */

  1145. static av_always_inline void prefetch_motion(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y, int mb_xy, int ref)

  1146. {

  1147.     /* Don't prefetch refs that haven't been used very often this frame. */

  1148.     if (s->ref_count[ref-1] > (mb_xy >> 5)) {

  1149.         int x_off = mb_x << 4, y_off = mb_y << 4;

  1150.         int mx = (mb->mv.x>>2) + x_off + 8;

  1151.         int my = (mb->mv.y>>2) + y_off;

  1152.         uint8_t **src= s->framep[ref]->data;

  1153.         int off= mx + (my + (mb_x&3)*4)*s->linesize + 64;

  1154.         s->dsp.prefetch(src[0]+off, s->linesize, 4);

  1155.         off= (mx>>1) + ((my>>1) + (mb_x&7))*s->uvlinesize + 64;

  1156.         s->dsp.prefetch(src[1]+off, src[2]-src[1], 2);

  1157.     }

  1158. }

  1159. 

  1160. /**

  1161.  * Apply motion vectors to prediction buffer, chapter 18.

  1162.  */

  1163. static av_always_inline

  1164. void inter_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,

  1165.                    int mb_x, int mb_y)

  1166. {

  1167.     int x_off = mb_x << 4, y_off = mb_y << 4;

  1168.     int width = 16*s->mb_width, height = 16*s->mb_height;

  1169.     AVFrame *ref = s->framep[mb->ref_frame];

  1170.     VP56mv *bmv = mb->bmv;

  1171. 

  1172.     switch (mb->partitioning) {

  1173.     case VP8_SPLITMVMODE_NONE:

  1174.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1175.                     0, 0, 16, 16, width, height, &mb->mv);

  1176.         break;

  1177.     case VP8_SPLITMVMODE_4x4: {

  1178.         int x, y;

  1179.         VP56mv uvmv;

  1180. 

  1181.         /* Y */

  1182.         for (y = 0; y < 4; y++) {

  1183.             for (x = 0; x < 4; x++) {

  1184.                 vp8_mc_luma(s, dst[0] + 4*y*s->linesize + x*4,

  1185.                             ref->data[0], &bmv[4*y + x],

  1186.                             4*x + x_off, 4*y + y_off, 4, 4,

  1187.                             width, height, s->linesize,

  1188.                             s->put_pixels_tab[2]);

  1189.             }

  1190.         }

  1191. 

  1192.         /* U/V */

  1193.         x_off >>= 1; y_off >>= 1; width >>= 1; height >>= 1;

  1194.         for (y = 0; y < 2; y++) {

  1195.             for (x = 0; x < 2; x++) {

  1196.                 uvmv.x = mb->bmv[ 2*y    * 4 + 2*x  ].x +

  1197.                          mb->bmv[ 2*y    * 4 + 2*x+1].x +

  1198.                          mb->bmv[(2*y+1) * 4 + 2*x  ].x +

  1199.                          mb->bmv[(2*y+1) * 4 + 2*x+1].x;

  1200.                 uvmv.y = mb->bmv[ 2*y    * 4 + 2*x  ].y +

  1201.                          mb->bmv[ 2*y    * 4 + 2*x+1].y +

  1202.                          mb->bmv[(2*y+1) * 4 + 2*x  ].y +

  1203.                          mb->bmv[(2*y+1) * 4 + 2*x+1].y;

  1204.                 uvmv.x = (uvmv.x + 2 + (uvmv.x >> (INT_BIT-1))) >> 2;

  1205.                 uvmv.y = (uvmv.y + 2 + (uvmv.y >> (INT_BIT-1))) >> 2;

  1206.                 if (s->profile == 3) {

  1207.                     uvmv.x &= ~7;

  1208.                     uvmv.y &= ~7;

  1209.                 }

  1210.                 vp8_mc_chroma(s, dst[1] + 4*y*s->uvlinesize + x*4,

  1211.                               dst[2] + 4*y*s->uvlinesize + x*4,

  1212.                               ref->data[1], ref->data[2], &uvmv,

  1213.                               4*x + x_off, 4*y + y_off, 4, 4,

  1214.                               width, height, s->uvlinesize,

  1215.                               s->put_pixels_tab[2]);

  1216.             }

  1217.         }

  1218.         break;

  1219.     }

  1220.     case VP8_SPLITMVMODE_16x8:

  1221.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1222.                     0, 0, 16, 8, width, height, &bmv[0]);

  1223.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1224.                     0, 8, 16, 8, width, height, &bmv[1]);

  1225.         break;

  1226.     case VP8_SPLITMVMODE_8x16:

  1227.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1228.                     0, 0, 8, 16, width, height, &bmv[0]);

  1229.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1230.                     8, 0, 8, 16, width, height, &bmv[1]);

  1231.         break;

  1232.     case VP8_SPLITMVMODE_8x8:

  1233.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1234.                     0, 0, 8, 8, width, height, &bmv[0]);

  1235.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1236.                     8, 0, 8, 8, width, height, &bmv[1]);

  1237.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1238.                     0, 8, 8, 8, width, height, &bmv[2]);

  1239.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1240.                     8, 8, 8, 8, width, height, &bmv[3]);

  1241.         break;

  1242.     }

  1243. }

  1244. 

  1245. static av_always_inline void idct_mb(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb)

  1246. {

  1247.     int x, y, ch;

  1248. 

  1249.     if (mb->mode != MODE_I4x4) {

  1250.         uint8_t *y_dst = dst[0];

  1251.         for (y = 0; y < 4; y++) {

  1252.             uint32_t nnz4 = AV_RL32(s->non_zero_count_cache[y]);

  1253.             if (nnz4) {

  1254.                 if (nnz4&~0x01010101) {

  1255.                     for (x = 0; x < 4; x++) {

  1256.                         if ((uint8_t)nnz4 == 1)

  1257.                             s->vp8dsp.vp8_idct_dc_add(y_dst+4*x, s->block[y][x], s->linesize);

  1258.                         else if((uint8_t)nnz4 > 1)

  1259.                             s->vp8dsp.vp8_idct_add(y_dst+4*x, s->block[y][x], s->linesize);

  1260.                         nnz4 >>= 8;

  1261.                         if (!nnz4)

  1262.                             break;

  1263.                     }

  1264.                 } else {

  1265.                     s->vp8dsp.vp8_idct_dc_add4y(y_dst, s->block[y], s->linesize);

  1266.                 }

  1267.             }

  1268.             y_dst += 4*s->linesize;

  1269.         }

  1270.     }

  1271. 

  1272.     for (ch = 0; ch < 2; ch++) {

  1273.         uint32_t nnz4 = AV_RL32(s->non_zero_count_cache[4+ch]);

  1274.         if (nnz4) {

  1275.             uint8_t *ch_dst = dst[1+ch];

  1276.             if (nnz4&~0x01010101) {

  1277.                 for (y = 0; y < 2; y++) {

  1278.                     for (x = 0; x < 2; x++) {

  1279.                         if ((uint8_t)nnz4 == 1)

  1280.                             s->vp8dsp.vp8_idct_dc_add(ch_dst+4*x, s->block[4+ch][(y<<1)+x], s->uvlinesize);

  1281.                         else if((uint8_t)nnz4 > 1)

  1282.                             s->vp8dsp.vp8_idct_add(ch_dst+4*x, s->block[4+ch][(y<<1)+x], s->uvlinesize);

  1283.                         nnz4 >>= 8;

  1284.                         if (!nnz4)

  1285.                             break;

  1286.                     }

  1287.                     ch_dst += 4*s->uvlinesize;

  1288.                 }

  1289.             } else {

  1290.                 s->vp8dsp.vp8_idct_dc_add4uv(ch_dst, s->block[4+ch], s->uvlinesize);

  1291.             }

  1292.         }

  1293.     }

  1294. }

  1295. 

  1296. static av_always_inline void filter_level_for_mb(VP8Context *s, VP8Macroblock *mb, VP8FilterStrength *f )

  1297. {

  1298.     int interior_limit, filter_level;

  1299. 

  1300.     if (s->segmentation.enabled) {

  1301.         filter_level = s->segmentation.filter_level[s->segment];

  1302.         if (!s->segmentation.absolute_vals)

  1303.             filter_level += s->filter.level;

  1304.     } else

  1305.         filter_level = s->filter.level;

  1306. 

  1307.     if (s->lf_delta.enabled) {

  1308.         filter_level += s->lf_delta.ref[mb->ref_frame];

  1309.         filter_level += s->lf_delta.mode[mb->mode];

  1310.     }

  1311. 

  1312. /* Like av_clip for inputs 0 and max, where max is equal to (2^n-1) */

  1313. #define POW2CLIP(x,max) (((x) & ~max) ? (-(x))>>31 & max : (x));

  1314.     filter_level = POW2CLIP(filter_level, 63);

  1315. 

  1316.     interior_limit = filter_level;

  1317.     if (s->filter.sharpness) {

  1318.         interior_limit >>= (s->filter.sharpness + 3) >> 2;

  1319.         interior_limit = FFMIN(interior_limit, 9 - s->filter.sharpness);

  1320.     }

  1321.     interior_limit = FFMAX(interior_limit, 1);

  1322. 

  1323.     f->filter_level = filter_level;

  1324.     f->inner_limit = interior_limit;

  1325.     f->inner_filter = !mb->skip || mb->mode == MODE_I4x4 || mb->mode == VP8_MVMODE_SPLIT;

  1326. }

  1327. 

  1328. static av_always_inline void filter_mb(VP8Context *s, uint8_t *dst[3], VP8FilterStrength *f, int mb_x, int mb_y)

  1329. {

  1330.     int mbedge_lim, bedge_lim, hev_thresh;

  1331.     int filter_level = f->filter_level;

  1332.     int inner_limit = f->inner_limit;

  1333.     int inner_filter = f->inner_filter;

  1334.     int linesize = s->linesize;

  1335.     int uvlinesize = s->uvlinesize;

  1336.     static const uint8_t hev_thresh_lut[2][64] = {

  1337.         { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,

  1338.           2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  1339.           3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  1340.           3, 3, 3, 3 },

  1341.         { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,

  1342.           1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1343.           2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  1344.           2, 2, 2, 2 }

  1345.     };

  1346. 

  1347.     if (!filter_level)

  1348.         return;

  1349. 

  1350.      bedge_lim = 2*filter_level + inner_limit;

  1351.     mbedge_lim = bedge_lim + 4;

  1352. 

  1353.     hev_thresh = hev_thresh_lut[s->keyframe][filter_level];

  1354. 

  1355.     if (mb_x) {

  1356.         s->vp8dsp.vp8_h_loop_filter16y(dst[0],     linesize,

  1357.                                        mbedge_lim, inner_limit, hev_thresh);

  1358.         s->vp8dsp.vp8_h_loop_filter8uv(dst[1],     dst[2],      uvlinesize,

  1359.                                        mbedge_lim, inner_limit, hev_thresh);

  1360.     }

  1361. 

  1362.     if (inner_filter) {

  1363.         s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+ 4, linesize, bedge_lim,

  1364.                                              inner_limit, hev_thresh);

  1365.         s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+ 8, linesize, bedge_lim,

  1366.                                              inner_limit, hev_thresh);

  1367.         s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+12, linesize, bedge_lim,

  1368.                                              inner_limit, hev_thresh);

  1369.         s->vp8dsp.vp8_h_loop_filter8uv_inner(dst[1] + 4, dst[2] + 4,

  1370.                                              uvlinesize,  bedge_lim,

  1371.                                              inner_limit, hev_thresh);

  1372.     }

  1373. 

  1374.     if (mb_y) {

  1375.         s->vp8dsp.vp8_v_loop_filter16y(dst[0],     linesize,

  1376.                                        mbedge_lim, inner_limit, hev_thresh);

  1377.         s->vp8dsp.vp8_v_loop_filter8uv(dst[1],     dst[2],      uvlinesize,

  1378.                                        mbedge_lim, inner_limit, hev_thresh);

  1379.     }

  1380. 

  1381.     if (inner_filter) {

  1382.         s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+ 4*linesize,

  1383.                                              linesize,    bedge_lim,

  1384.                                              inner_limit, hev_thresh);

  1385.         s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+ 8*linesize,

  1386.                                              linesize,    bedge_lim,

  1387.                                              inner_limit, hev_thresh);

  1388.         s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+12*linesize,

  1389.                                              linesize,    bedge_lim,

  1390.                                              inner_limit, hev_thresh);

  1391.         s->vp8dsp.vp8_v_loop_filter8uv_inner(dst[1] + 4 * uvlinesize,

  1392.                                              dst[2] + 4 * uvlinesize,

  1393.                                              uvlinesize,  bedge_lim,

  1394.                                              inner_limit, hev_thresh);

  1395.     }

  1396. }

  1397. 

  1398. static av_always_inline void filter_mb_simple(VP8Context *s, uint8_t *dst, VP8FilterStrength *f, int mb_x, int mb_y)

  1399. {

  1400.     int mbedge_lim, bedge_lim;

  1401.     int filter_level = f->filter_level;

  1402.     int inner_limit = f->inner_limit;

  1403.     int inner_filter = f->inner_filter;

  1404.     int linesize = s->linesize;

  1405. 

  1406.     if (!filter_level)

  1407.         return;

  1408. 

  1409.      bedge_lim = 2*filter_level + inner_limit;

  1410.     mbedge_lim = bedge_lim + 4;

  1411. 

  1412.     if (mb_x)

  1413.         s->vp8dsp.vp8_h_loop_filter_simple(dst, linesize, mbedge_lim);

  1414.     if (inner_filter) {

  1415.         s->vp8dsp.vp8_h_loop_filter_simple(dst+ 4, linesize, bedge_lim);

  1416.         s->vp8dsp.vp8_h_loop_filter_simple(dst+ 8, linesize, bedge_lim);

  1417.         s->vp8dsp.vp8_h_loop_filter_simple(dst+12, linesize, bedge_lim);

  1418.     }

  1419. 

  1420.     if (mb_y)

  1421.         s->vp8dsp.vp8_v_loop_filter_simple(dst, linesize, mbedge_lim);

  1422.     if (inner_filter) {

  1423.         s->vp8dsp.vp8_v_loop_filter_simple(dst+ 4*linesize, linesize, bedge_lim);

  1424.         s->vp8dsp.vp8_v_loop_filter_simple(dst+ 8*linesize, linesize, bedge_lim);

  1425.         s->vp8dsp.vp8_v_loop_filter_simple(dst+12*linesize, linesize, bedge_lim);

  1426.     }

  1427. }

  1428. 

  1429. static void filter_mb_row(VP8Context *s, int mb_y)

  1430. {

  1431.     VP8FilterStrength *f = s->filter_strength;

  1432.     uint8_t *dst[3] = {

  1433.         s->framep[VP56_FRAME_CURRENT]->data[0] + 16*mb_y*s->linesize,

  1434.         s->framep[VP56_FRAME_CURRENT]->data[1] +  8*mb_y*s->uvlinesize,

  1435.         s->framep[VP56_FRAME_CURRENT]->data[2] +  8*mb_y*s->uvlinesize

  1436.     };

  1437.     int mb_x;

  1438. 

  1439.     for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1440.         backup_mb_border(s->top_border[mb_x+1], dst[0], dst[1], dst[2], s->linesize, s->uvlinesize, 0);

  1441.         filter_mb(s, dst, f++, mb_x, mb_y);

  1442.         dst[0] += 16;

  1443.         dst[1] += 8;

  1444.         dst[2] += 8;

  1445.     }

  1446. }

  1447. 

  1448. static void filter_mb_row_simple(VP8Context *s, int mb_y)

  1449. {

  1450.     VP8FilterStrength *f = s->filter_strength;

  1451.     uint8_t *dst = s->framep[VP56_FRAME_CURRENT]->data[0] + 16*mb_y*s->linesize;

  1452.     int mb_x;

  1453. 

  1454.     for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1455.         backup_mb_border(s->top_border[mb_x+1], dst, NULL, NULL, s->linesize, 0, 1);

  1456.         filter_mb_simple(s, dst, f++, mb_x, mb_y);

  1457.         dst += 16;

  1458.     }

  1459. }

  1460. 

  1461. static int vp8_decode_frame(AVCodecContext *avctx, void *data, int *data_size,

  1462.                             AVPacket *avpkt)

  1463. {

  1464.     VP8Context *s = avctx->priv_data;

  1465.     int ret, mb_x, mb_y, i, y, referenced;

  1466.     enum AVDiscard skip_thresh;

  1467.     AVFrame *av_uninit(curframe);

  1468. 

  1469.     if ((ret = decode_frame_header(s, avpkt->data, avpkt->size)) < 0)

  1470.         return ret;

  1471. 

  1472.     referenced = s->update_last || s->update_golden == VP56_FRAME_CURRENT

  1473.                                 || s->update_altref == VP56_FRAME_CURRENT;

  1474. 

  1475.     skip_thresh = !referenced ? AVDISCARD_NONREF :

  1476.                     !s->keyframe ? AVDISCARD_NONKEY : AVDISCARD_ALL;

  1477. 

  1478.     if (avctx->skip_frame >= skip_thresh) {

  1479.         s->invisible = 1;

  1480.         goto skip_decode;

  1481.     }

  1482.     s->deblock_filter = s->filter.level && avctx->skip_loop_filter < skip_thresh;

  1483. 

  1484.     for (i = 0; i < 4; i++)

  1485.         if (&s->frames[i] != s->framep[VP56_FRAME_PREVIOUS] &&

  1486.             &s->frames[i] != s->framep[VP56_FRAME_GOLDEN] &&

  1487.             &s->frames[i] != s->framep[VP56_FRAME_GOLDEN2]) {

  1488.             curframe = s->framep[VP56_FRAME_CURRENT] = &s->frames[i];

  1489.             break;

  1490.         }

  1491.     if (curframe->data[0])

  1492.         avctx->release_buffer(avctx, curframe);

  1493. 

  1494.     curframe->key_frame = s->keyframe;

  1495.     curframe->pict_type = s->keyframe ? FF_I_TYPE : FF_P_TYPE;

  1496.     curframe->reference = referenced ? 3 : 0;

  1497.     if ((ret = avctx->get_buffer(avctx, curframe))) {

  1498.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed!\n");

  1499.         return ret;

  1500.     }

  1501. 

  1502.     // Given that arithmetic probabilities are updated every frame, it's quite likely

  1503.     // that the values we have on a random interframe are complete junk if we didn't

  1504.     // start decode on a keyframe. So just don't display anything rather than junk.

  1505.     if (!s->keyframe && (!s->framep[VP56_FRAME_PREVIOUS] ||

  1506.                          !s->framep[VP56_FRAME_GOLDEN] ||

  1507.                          !s->framep[VP56_FRAME_GOLDEN2])) {

  1508.         av_log(avctx, AV_LOG_WARNING, "Discarding interframe without a prior keyframe!\n");

  1509.         return AVERROR_INVALIDDATA;

  1510.     }

  1511. 

  1512.     s->linesize   = curframe->linesize[0];

  1513.     s->uvlinesize = curframe->linesize[1];

  1514. 

  1515.     if (!s->edge_emu_buffer)

  1516.         s->edge_emu_buffer = av_malloc(21*s->linesize);

  1517. 

  1518.     memset(s->top_nnz, 0, s->mb_width*sizeof(*s->top_nnz));

  1519. 

  1520.     /* Zero macroblock structures for top/top-left prediction from outside the frame. */

  1521.     memset(s->macroblocks + s->mb_height*2 - 1, 0, (s->mb_width+1)*sizeof(*s->macroblocks));

  1522. 

  1523.     // top edge of 127 for intra prediction

  1524.     if (!(avctx->flags & CODEC_FLAG_EMU_EDGE)) {

  1525.         s->top_border[0][15] = s->top_border[0][23] = 127;

  1526.         memset(s->top_border[1]-1, 127, s->mb_width*sizeof(*s->top_border)+1);

  1527.     }

  1528.     memset(s->ref_count, 0, sizeof(s->ref_count));

  1529.     if (s->keyframe)

  1530.         memset(s->intra4x4_pred_mode_top, DC_PRED, s->mb_width*4);

  1531. 

  1532.     #define MARGIN (16 << 2)

  1533.     s->mv_min.y = -MARGIN;

  1534.     s->mv_max.y = ((s->mb_height - 1) << 6) + MARGIN;

  1535. 

  1536.     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1537.         VP56RangeCoder *c = &s->coeff_partition[mb_y & (s->num_coeff_partitions-1)];

  1538.         VP8Macroblock *mb = s->macroblocks + (s->mb_height - mb_y - 1)*2;

  1539.         int mb_xy = mb_y*s->mb_width;

  1540.         uint8_t *dst[3] = {

  1541.             curframe->data[0] + 16*mb_y*s->linesize,

  1542.             curframe->data[1] +  8*mb_y*s->uvlinesize,

  1543.             curframe->data[2] +  8*mb_y*s->uvlinesize

  1544.         };

  1545. 

  1546.         memset(mb - 1, 0, sizeof(*mb));   // zero left macroblock

  1547.         memset(s->left_nnz, 0, sizeof(s->left_nnz));

  1548.         AV_WN32A(s->intra4x4_pred_mode_left, DC_PRED*0x01010101);

  1549. 

  1550.         // left edge of 129 for intra prediction

  1551.         if (!(avctx->flags & CODEC_FLAG_EMU_EDGE)) {

  1552.             for (i = 0; i < 3; i++)

  1553.                 for (y = 0; y < 16>>!!i; y++)

  1554.                     dst[i][y*curframe->linesize[i]-1] = 129;

  1555.             if (mb_y == 1) // top left edge is also 129

  1556.                 s->top_border[0][15] = s->top_border[0][23] = s->top_border[0][31] = 129;

  1557.         }

  1558. 

  1559.         s->mv_min.x = -MARGIN;

  1560.         s->mv_max.x = ((s->mb_width  - 1) << 6) + MARGIN;

  1561. 

  1562.         for (mb_x = 0; mb_x < s->mb_width; mb_x++, mb_xy++, mb++) {

  1563.             /* Prefetch the current frame, 4 MBs ahead */

  1564.             s->dsp.prefetch(dst[0] + (mb_x&3)*4*s->linesize + 64, s->linesize, 4);

  1565.             s->dsp.prefetch(dst[1] + (mb_x&7)*s->uvlinesize + 64, dst[2] - dst[1], 2);

  1566. 

  1567.             decode_mb_mode(s, mb, mb_x, mb_y, s->segmentation_map + mb_xy);

  1568. 

  1569.             prefetch_motion(s, mb, mb_x, mb_y, mb_xy, VP56_FRAME_PREVIOUS);

  1570. 

  1571.             if (!mb->skip)

  1572.                 decode_mb_coeffs(s, c, mb, s->top_nnz[mb_x], s->left_nnz);

  1573. 

  1574.             if (mb->mode <= MODE_I4x4)

  1575.                 intra_predict(s, dst, mb, mb_x, mb_y);

  1576.             else

  1577.                 inter_predict(s, dst, mb, mb_x, mb_y);

  1578. 

  1579.             prefetch_motion(s, mb, mb_x, mb_y, mb_xy, VP56_FRAME_GOLDEN);

  1580. 

  1581.             if (!mb->skip) {

  1582.                 idct_mb(s, dst, mb);

  1583.             } else {

  1584.                 AV_ZERO64(s->left_nnz);

  1585.                 AV_WN64(s->top_nnz[mb_x], 0);   // array of 9, so unaligned

  1586. 

  1587.                 // Reset DC block predictors if they would exist if the mb had coefficients

  1588.                 if (mb->mode != MODE_I4x4 && mb->mode != VP8_MVMODE_SPLIT) {

  1589.                     s->left_nnz[8]      = 0;

  1590.                     s->top_nnz[mb_x][8] = 0;

  1591.                 }

  1592.             }

  1593. 

  1594.             if (s->deblock_filter)

  1595.                 filter_level_for_mb(s, mb, &s->filter_strength[mb_x]);

  1596. 

  1597.             prefetch_motion(s, mb, mb_x, mb_y, mb_xy, VP56_FRAME_GOLDEN2);

  1598. 

  1599.             dst[0] += 16;

  1600.             dst[1] += 8;

  1601.             dst[2] += 8;

  1602.             s->mv_min.x -= 64;

  1603.             s->mv_max.x -= 64;

  1604.         }

  1605.         if (s->deblock_filter) {

  1606.             if (s->filter.simple)

  1607.                 filter_mb_row_simple(s, mb_y);

  1608.             else

  1609.                 filter_mb_row(s, mb_y);

  1610.         }

  1611.         s->mv_min.y -= 64;

  1612.         s->mv_max.y -= 64;

  1613.     }

  1614. 

  1615. skip_decode:

  1616.     // if future frames don't use the updated probabilities,

  1617.     // reset them to the values we saved

  1618.     if (!s->update_probabilities)

  1619.         s->prob[0] = s->prob[1];

  1620. 

  1621.     // check if golden and altref are swapped

  1622.     if (s->update_altref == VP56_FRAME_GOLDEN &&

  1623.         s->update_golden == VP56_FRAME_GOLDEN2)

  1624.         FFSWAP(AVFrame *, s->framep[VP56_FRAME_GOLDEN], s->framep[VP56_FRAME_GOLDEN2]);

  1625.     else {

  1626.         if (s->update_altref != VP56_FRAME_NONE)

  1627.             s->framep[VP56_FRAME_GOLDEN2] = s->framep[s->update_altref];

  1628. 

  1629.         if (s->update_golden != VP56_FRAME_NONE)

  1630.             s->framep[VP56_FRAME_GOLDEN] = s->framep[s->update_golden];

  1631.     }

  1632. 

  1633.     if (s->update_last) // move cur->prev

  1634.         s->framep[VP56_FRAME_PREVIOUS] = s->framep[VP56_FRAME_CURRENT];

  1635. 

  1636.     // release no longer referenced frames

  1637.     for (i = 0; i < 4; i++)

  1638.         if (s->frames[i].data[0] &&

  1639.             &s->frames[i] != s->framep[VP56_FRAME_CURRENT] &&

  1640.             &s->frames[i] != s->framep[VP56_FRAME_PREVIOUS] &&

  1641.             &s->frames[i] != s->framep[VP56_FRAME_GOLDEN] &&

  1642.             &s->frames[i] != s->framep[VP56_FRAME_GOLDEN2])

  1643.             avctx->release_buffer(avctx, &s->frames[i]);

  1644. 

  1645.     if (!s->invisible) {

  1646.         *(AVFrame*)data = *s->framep[VP56_FRAME_CURRENT];

  1647.         *data_size = sizeof(AVFrame);

  1648.     }

  1649. 

  1650.     return avpkt->size;

  1651. }

  1652. 

  1653. static av_cold int vp8_decode_init(AVCodecContext *avctx)

  1654. {

  1655.     VP8Context *s = avctx->priv_data;

  1656. 

  1657.     s->avctx = avctx;

  1658.     avctx->pix_fmt = PIX_FMT_YUV420P;

  1659. 

  1660.     dsputil_init(&s->dsp, avctx);

  1661.     ff_h264_pred_init(&s->hpc, CODEC_ID_VP8);

  1662.     ff_vp8dsp_init(&s->vp8dsp);

  1663. 

  1664.     return 0;

  1665. }

  1666. 

  1667. static av_cold int vp8_decode_free(AVCodecContext *avctx)

  1668. {

  1669.     vp8_decode_flush(avctx);

  1670.     return 0;

  1671. }

  1672. 

  1673. AVCodec ff_vp8_decoder = {

  1674.     "vp8",

  1675.     AVMEDIA_TYPE_VIDEO,

  1676.     CODEC_ID_VP8,

  1677.     sizeof(VP8Context),

  1678.     vp8_decode_init,

  1679.     NULL,

  1680.     vp8_decode_free,

  1681.     vp8_decode_frame,

  1682.     CODEC_CAP_DR1,

  1683.     .flush = vp8_decode_flush,

  1684.     .long_name = NULL_IF_CONFIG_SMALL("On2 VP8"),

  1685. };