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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 Libav.

  9.  *

  10.  * Libav 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.  * Libav 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 Libav; 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. #include "thread.h"

  31. 

  32. #if ARCH_ARM

  33. #   include "arm/vp8.h"

  34. #endif

  35. 

  36. static void vp8_decode_flush(AVCodecContext *avctx)

  37. {

  38.     VP8Context *s = avctx->priv_data;

  39.     int i;

  40. 

  41.     if (!avctx->is_copy) {

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

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

  44.                 ff_thread_release_buffer(avctx, &s->frames[i]);

  45.     }

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

  47. 

  48.     av_freep(&s->macroblocks_base);

  49.     av_freep(&s->filter_strength);

  50.     av_freep(&s->intra4x4_pred_mode_top);

  51.     av_freep(&s->top_nnz);

  52.     av_freep(&s->edge_emu_buffer);

  53.     av_freep(&s->top_border);

  54.     av_freep(&s->segmentation_map);

  55. 

  56.     s->macroblocks        = NULL;

  57. }

  58. 

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

  60. {

  61.     if (width  != s->avctx->width ||

  62.         height != s->avctx->height) {

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

  64.             return AVERROR_INVALIDDATA;

  65. 

  66.         vp8_decode_flush(s->avctx);

  67. 

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

  69.     }

  70. 

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

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

  73. 

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

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

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

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

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

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

  80. 

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

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

  83.         return AVERROR(ENOMEM);

  84. 

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

  86. 

  87.     return 0;

  88. }

  89. 

  90. static void parse_segment_info(VP8Context *s)

  91. {

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

  93.     int i;

  94. 

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

  96. 

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

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

  99. 

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

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

  102. 

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

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

  105.     }

  106.     if (s->segmentation.update_map)

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

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

  109. }

  110. 

  111. static void update_lf_deltas(VP8Context *s)

  112. {

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

  114.     int i;

  115. 

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

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

  118. 

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

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

  121. }

  122. 

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

  124. {

  125.     const uint8_t *sizes = buf;

  126.     int i;

  127. 

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

  129. 

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

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

  132.     if (buf_size < 0)

  133.         return -1;

  134. 

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

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

  137.         if (buf_size - size < 0)

  138.             return -1;

  139. 

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

  141.         buf      += size;

  142.         buf_size -= size;

  143.     }

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

  145. 

  146.     return 0;

  147. }

  148. 

  149. static void get_quants(VP8Context *s)

  150. {

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

  152.     int i, base_qi;

  153. 

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

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

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

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

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

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

  160. 

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

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

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

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

  165.                 base_qi += yac_qi;

  166.         } else

  167.             base_qi = yac_qi;

  168. 

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

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

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

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

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

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

  175. 

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

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

  178.     }

  179. }

  180. 

  181. /**

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

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

  184.  *

  185.  * Intra frames update all 3 references

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

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

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

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

  190.  *      0: no update

  191.  *      1: VP56_FRAME_PREVIOUS

  192.  *      2: update golden with altref, or update altref with golden

  193.  */

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

  195. {

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

  197. 

  198.     if (update)

  199.         return VP56_FRAME_CURRENT;

  200. 

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

  202.     case 1:

  203.         return VP56_FRAME_PREVIOUS;

  204.     case 2:

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

  206.     }

  207.     return VP56_FRAME_NONE;

  208. }

  209. 

  210. static void update_refs(VP8Context *s)

  211. {

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

  213. 

  214.     int update_golden = vp8_rac_get(c);

  215.     int update_altref = vp8_rac_get(c);

  216. 

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

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

  219. }

  220. 

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

  222. {

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

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

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

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

  227. 

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

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

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

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

  232.     buf      += 3;

  233.     buf_size -= 3;

  234. 

  235.     if (s->profile > 3)

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

  237. 

  238.     if (!s->profile)

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

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

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

  242. 

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

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

  245.         return AVERROR_INVALIDDATA;

  246.     }

  247. 

  248.     if (s->keyframe) {

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

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

  251.             return AVERROR_INVALIDDATA;

  252.         }

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

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

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

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

  257.         buf      += 7;

  258.         buf_size -= 7;

  259. 

  260.         if (hscale || vscale)

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

  262. 

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

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

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

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

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

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

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

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

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

  272.     }

  273. 

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

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

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

  277.             return ret;

  278.     }

  279. 

  280.     ff_vp56_init_range_decoder(c, buf, header_size);

  281.     buf      += header_size;

  282.     buf_size -= header_size;

  283. 

  284.     if (s->keyframe) {

  285.         if (vp8_rac_get(c))

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

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

  288.     }

  289. 

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

  291.         parse_segment_info(s);

  292.     else

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

  294. 

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

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

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

  298. 

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

  300.         if (vp8_rac_get(c))

  301.             update_lf_deltas(s);

  302. 

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

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

  305.         return AVERROR_INVALIDDATA;

  306.     }

  307. 

  308.     get_quants(s);

  309. 

  310.     if (!s->keyframe) {

  311.         update_refs(s);

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

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

  314.     }

  315. 

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

  317.     // make a copy of the current probabilities

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

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

  320. 

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

  322. 

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

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

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

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

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

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

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

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

  331.                     }

  332. 

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

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

  335. 

  336.     if (!s->keyframe) {

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

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

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

  340. 

  341.         if (vp8_rac_get(c))

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

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

  344.         if (vp8_rac_get(c))

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

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

  347. 

  348.         // 17.2 MV probability update

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

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

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

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

  353.     }

  354. 

  355.     return 0;

  356. }

  357. 

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

  359. {

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

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

  362. }

  363. 

  364. /**

  365.  * Motion vector coding, 17.1.

  366.  */

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

  368. {

  369.     int bit, x = 0;

  370. 

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

  372.         int i;

  373. 

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

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

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

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

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

  379.             x += 8;

  380.     } else {

  381.         // small_mvtree

  382.         const uint8_t *ps = p+2;

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

  384.         ps += 1 + 3*bit;

  385.         x  += 4*bit;

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

  387.         ps += 1 + bit;

  388.         x  += 2*bit;

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

  390.     }

  391. 

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

  393. }

  394. 

  395. static av_always_inline

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

  397. {

  398.     if (left == top)

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

  400.     if (!top)

  401.         return vp8_submv_prob[2];

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

  403. }

  404. 

  405. /**

  406.  * Split motion vector prediction, 16.4.

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

  408.  */

  409. static av_always_inline

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

  411. {

  412.     int part_idx;

  413.     int n, num;

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

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

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

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

  418.                   *mbsplits_cur, *firstidx;

  419.     VP56mv *top_mv  = top_mb->bmv;

  420.     VP56mv *left_mv = left_mb->bmv;

  421.     VP56mv *cur_mv  = mb->bmv;

  422. 

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

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

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

  426.         } else {

  427.             part_idx = VP8_SPLITMVMODE_8x8;

  428.         }

  429.     } else {

  430.         part_idx = VP8_SPLITMVMODE_4x4;

  431.     }

  432. 

  433.     num = vp8_mbsplit_count[part_idx];

  434.     mbsplits_cur = vp8_mbsplits[part_idx],

  435.     firstidx = vp8_mbfirstidx[part_idx];

  436.     mb->partitioning = part_idx;

  437. 

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

  439.         int k = firstidx[n];

  440.         uint32_t left, above;

  441.         const uint8_t *submv_prob;

  442. 

  443.         if (!(k & 3))

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

  445.         else

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

  447.         if (k <= 3)

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

  449.         else

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

  451. 

  452.         submv_prob = get_submv_prob(left, above);

  453. 

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

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

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

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

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

  459.                 } else {

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

  461.                 }

  462.             } else {

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

  464.             }

  465.         } else {

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

  467.         }

  468.     }

  469. 

  470.     return num;

  471. }

  472. 

  473. static av_always_inline

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

  475. {

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

  477.                                   mb - 1 /* left */,

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

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

  480.     enum { VP8_EDGE_TOP, VP8_EDGE_LEFT, VP8_EDGE_TOPLEFT };

  481.     int idx = CNT_ZERO;

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

  483.     int8_t *sign_bias = s->sign_bias;

  484.     VP56mv near_mv[4];

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

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

  487. 

  488.     AV_ZERO32(&near_mv[0]);

  489.     AV_ZERO32(&near_mv[1]);

  490. 

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

  492.     #define MV_EDGE_CHECK(n)\

  493.     {\

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

  495.         int edge_ref = edge->ref_frame;\

  496.         if (edge_ref != VP56_FRAME_CURRENT) {\

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

  498.             if (mv) {\

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

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

  501.                     mv = ~mv;\

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

  503.                 }\

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

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

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

  507.             } else\

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

  509.         }\

  510.     }

  511. 

  512.     MV_EDGE_CHECK(0)

  513.     MV_EDGE_CHECK(1)

  514.     MV_EDGE_CHECK(2)

  515. 

  516.     mb->partitioning = VP8_SPLITMVMODE_NONE;

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

  518.         mb->mode = VP8_MVMODE_MV;

  519. 

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

  521.         if (cnt[CNT_SPLITMV] && AV_RN32A(&near_mv[1 + VP8_EDGE_TOP]) == AV_RN32A(&near_mv[1 + VP8_EDGE_TOPLEFT]))

  522.             cnt[CNT_NEAREST] += 1;

  523. 

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

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

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

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

  528.         }

  529. 

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

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

  532. 

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

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

  535.                 cnt[CNT_SPLITMV] = ((mb_edge[VP8_EDGE_LEFT]->mode    == VP8_MVMODE_SPLIT) +

  536.                                     (mb_edge[VP8_EDGE_TOP]->mode     == VP8_MVMODE_SPLIT)) * 2 +

  537.                                     (mb_edge[VP8_EDGE_TOPLEFT]->mode == VP8_MVMODE_SPLIT);

  538. 

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

  540.                     mb->mode = VP8_MVMODE_SPLIT;

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

  542.                 } else {

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

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

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

  546.                 }

  547.             } else {

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

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

  550.             }

  551.         } else {

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

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

  554.         }

  555.     } else {

  556.         mb->mode = VP8_MVMODE_ZERO;

  557.         AV_ZERO32(&mb->mv);

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

  559.     }

  560. }

  561. 

  562. static av_always_inline

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

  564.                            int mb_x, int keyframe)

  565. {

  566.     uint8_t *intra4x4 = s->intra4x4_pred_mode_mb;

  567.     if (keyframe) {

  568.         int x, y;

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

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

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

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

  573.                 const uint8_t *ctx;

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

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

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

  577.                 intra4x4++;

  578.             }

  579.         }

  580.     } else {

  581.         int i;

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

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

  584.     }

  585. }

  586. 

  587. static av_always_inline

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

  589. {

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

  591. 

  592.     if (s->segmentation.update_map)

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

  594.     else

  595.         *segment = ref ? *ref : *segment;

  596.     s->segment = *segment;

  597. 

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

  599. 

  600.     if (s->keyframe) {

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

  602. 

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

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

  605.         } else {

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

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

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

  609.         }

  610. 

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

  612.         mb->ref_frame = VP56_FRAME_CURRENT;

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

  614.         // inter MB, 16.2

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

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

  617.                 VP56_FRAME_GOLDEN2 /* altref */ : VP56_FRAME_GOLDEN;

  618.         else

  619.             mb->ref_frame = VP56_FRAME_PREVIOUS;

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

  621. 

  622.         // motion vectors, 16.3

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

  624.     } else {

  625.         // intra MB, 16.1

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

  627. 

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

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

  630. 

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

  632.         mb->ref_frame = VP56_FRAME_CURRENT;

  633.         mb->partitioning = VP8_SPLITMVMODE_NONE;

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

  635.     }

  636. }

  637. 

  638. #ifndef decode_block_coeffs_internal

  639. /**

  640.  * @param c arithmetic bitstream reader context

  641.  * @param block destination for block coefficients

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

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

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

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

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

  647.  * @return 0 if no coeffs were decoded

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

  649.  */

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

  651.                                         uint8_t probs[16][3][NUM_DCT_TOKENS-1],

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

  653. {

  654.     goto skip_eob;

  655.     do {

  656.         int coeff;

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

  658.             return i;

  659. 

  660. skip_eob:

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

  662.             if (++i == 16)

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

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

  665.             goto skip_eob;

  666.         }

  667. 

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

  669.             coeff = 1;

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

  671.         } else {

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

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

  674.                 if (coeff)

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

  676.                 coeff += 2;

  677.             } else {

  678.                 // DCT_CAT*

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

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

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

  682.                     } else {                                    // DCT_CAT2

  683.                         coeff  = 7;

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

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

  686.                     }

  687.                 } else {    // DCT_CAT3 and up

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

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

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

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

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

  693.                 }

  694.             }

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

  696.         }

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

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

  699. 

  700.     return i;

  701. }

  702. #endif

  703. 

  704. static av_always_inline

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

  706.                         uint8_t probs[16][3][NUM_DCT_TOKENS-1],

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

  708. {

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

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

  711.         return 0;

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

  713. }

  714. 

  715. static av_always_inline

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

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

  718. {

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

  720.     int nnz_pred, nnz, nnz_total = 0;

  721.     int segment = s->segment;

  722.     int block_dc = 0;

  723. 

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

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

  726. 

  727.         // decode DC values and do hadamard

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

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

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

  731.         if (nnz) {

  732.             nnz_total += nnz;

  733.             block_dc = 1;

  734.             if (nnz == 1)

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

  736.             else

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

  738.         }

  739.         luma_start = 1;

  740.         luma_ctx = 0;

  741.     }

  742. 

  743.     // luma blocks

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

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

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

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

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

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

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

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

  752.             nnz_total += nnz;

  753.         }

  754. 

  755.     // chroma blocks

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

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

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

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

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

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

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

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

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

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

  766.                 nnz_total += nnz;

  767.             }

  768. 

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

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

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

  772.     if (!nnz_total)

  773.         mb->skip = 1;

  774. }

  775. 

  776. static av_always_inline

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

  778.                       int linesize, int uvlinesize, int simple)

  779. {

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

  781.     if (!simple) {

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

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

  784.     }

  785. }

  786. 

  787. static av_always_inline

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

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

  790.                     int simple, int xchg)

  791. {

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

  793.     src_y  -=   linesize;

  794.     src_cb -= uvlinesize;

  795.     src_cr -= uvlinesize;

  796. 

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

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

  799.         else      AV_COPY64(b,a);               \

  800.     } while (0)

  801. 

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

  803.     XCHG(top_border,      src_y,   xchg);

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

  805.     if (mb_x < mb_width-1)

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

  807. 

  808.     // only copy chroma for normal loop filter

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

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

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

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

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

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

  815.     }

  816. }

  817. 

  818. static av_always_inline

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

  820. {

  821.     if (!mb_x) {

  822.         return mb_y ? TOP_DC_PRED8x8 : DC_128_PRED8x8;

  823.     } else {

  824.         return mb_y ? mode : LEFT_DC_PRED8x8;

  825.     }

  826. }

  827. 

  828. static av_always_inline

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

  830. {

  831.     if (!mb_x) {

  832.         return mb_y ? VERT_PRED8x8 : DC_129_PRED8x8;

  833.     } else {

  834.         return mb_y ? mode : HOR_PRED8x8;

  835.     }

  836. }

  837. 

  838. static av_always_inline

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

  840. {

  841.     if (mode == DC_PRED8x8) {

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

  843.     } else {

  844.         return mode;

  845.     }

  846. }

  847. 

  848. static av_always_inline

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

  850. {

  851.     switch (mode) {

  852.     case DC_PRED8x8:

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

  854.     case VERT_PRED8x8:

  855.         return !mb_y ? DC_127_PRED8x8 : mode;

  856.     case HOR_PRED8x8:

  857.         return !mb_x ? DC_129_PRED8x8 : mode;

  858.     case PLANE_PRED8x8 /*TM*/:

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

  860.     }

  861.     return mode;

  862. }

  863. 

  864. static av_always_inline

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

  866. {

  867.     if (!mb_x) {

  868.         return mb_y ? VERT_VP8_PRED : DC_129_PRED;

  869.     } else {

  870.         return mb_y ? mode : HOR_VP8_PRED;

  871.     }

  872. }

  873. 

  874. static av_always_inline

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

  876. {

  877.     switch (mode) {

  878.     case VERT_PRED:

  879.         if (!mb_x && mb_y) {

  880.             *copy_buf = 1;

  881.             return mode;

  882.         }

  883.         /* fall-through */

  884.     case DIAG_DOWN_LEFT_PRED:

  885.     case VERT_LEFT_PRED:

  886.         return !mb_y ? DC_127_PRED : mode;

  887.     case HOR_PRED:

  888.         if (!mb_y) {

  889.             *copy_buf = 1;

  890.             return mode;

  891.         }

  892.         /* fall-through */

  893.     case HOR_UP_PRED:

  894.         return !mb_x ? DC_129_PRED : mode;

  895.     case TM_VP8_PRED:

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

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

  898.     case DIAG_DOWN_RIGHT_PRED:

  899.     case VERT_RIGHT_PRED:

  900.     case HOR_DOWN_PRED:

  901.         if (!mb_y || !mb_x)

  902.             *copy_buf = 1;

  903.         return mode;

  904.     }

  905.     return mode;

  906. }

  907. 

  908. static av_always_inline

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

  910.                    int mb_x, int mb_y)

  911. {

  912.     AVCodecContext *avctx = s->avctx;

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

  914. 

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

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

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

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

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

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

  921. 

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

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

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

  925.         } else {

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

  927.         }

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

  929.     } else {

  930.         uint8_t *ptr = dst[0];

  931.         uint8_t *intra4x4 = s->intra4x4_pred_mode_mb;

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

  933. 

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

  935.         // the top macroblock for their topright edge

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

  937. 

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

  939.         // from the top macroblock

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

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

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

  943.             tr_right = (uint8_t *)&tr;

  944.         }

  945. 

  946.         if (mb->skip)

  947.             AV_ZERO128(s->non_zero_count_cache);

  948. 

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

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

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

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

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

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

  955. 

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

  957.                     topright = tr_top;

  958.                 } else if (x == 3)

  959.                     topright = tr_right;

  960. 

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

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

  963.                     if (copy) {

  964.                         dst = copy_dst + 12;

  965.                         linesize = 8;

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

  967.                             copy_dst[3] = 127U;

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

  969.                         } else {

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

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

  972.                                 copy_dst[3] = 129U;

  973.                             } else {

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

  975.                             }

  976.                         }

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

  978.                             copy_dst[11] =

  979.                             copy_dst[19] =

  980.                             copy_dst[27] =

  981.                             copy_dst[35] = 129U;

  982.                         } else {

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

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

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

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

  987.                         }

  988.                     }

  989.                 } else {

  990.                     mode = intra4x4[x];

  991.                 }

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

  993.                 if (copy) {

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

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

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

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

  998.                 }

  999. 

  1000.                 nnz = s->non_zero_count_cache[y][x];

  1001.                 if (nnz) {

  1002.                     if (nnz == 1)

  1003.                         s->vp8dsp.vp8_idct_dc_add(ptr+4*x, s->block[y][x], s->linesize);

  1004.                     else

  1005.                         s->vp8dsp.vp8_idct_add(ptr+4*x, s->block[y][x], s->linesize);

  1006.                 }

  1007.                 topright += 4;

  1008.             }

  1009. 

  1010.             ptr   += 4*s->linesize;

  1011.             intra4x4 += 4;

  1012.         }

  1013.     }

  1014. 

  1015.     if (avctx->flags & CODEC_FLAG_EMU_EDGE) {

  1016.         mode = check_intra_pred8x8_mode_emuedge(s->chroma_pred_mode, mb_x, mb_y);

  1017.     } else {

  1018.         mode = check_intra_pred8x8_mode(s->chroma_pred_mode, mb_x, mb_y);

  1019.     }

  1020.     s->hpc.pred8x8[mode](dst[1], s->uvlinesize);

  1021.     s->hpc.pred8x8[mode](dst[2], s->uvlinesize);

  1022. 

  1023.     if (!(avctx->flags & CODEC_FLAG_EMU_EDGE && !mb_y) && (s->deblock_filter || !mb_y))

  1024.         xchg_mb_border(s->top_border[mb_x+1], dst[0], dst[1], dst[2],

  1025.                        s->linesize, s->uvlinesize, mb_x, mb_y, s->mb_width,

  1026.                        s->filter.simple, 0);

  1027. }

  1028. 

  1029. static const uint8_t subpel_idx[3][8] = {

  1030.     { 0, 1, 2, 1, 2, 1, 2, 1 }, // nr. of left extra pixels,

  1031.                                 // also function pointer index

  1032.     { 0, 3, 5, 3, 5, 3, 5, 3 }, // nr. of extra pixels required

  1033.     { 0, 2, 3, 2, 3, 2, 3, 2 }, // nr. of right extra pixels

  1034. };

  1035. 

  1036. /**

  1037.  * Generic MC function.

  1038.  *

  1039.  * @param s VP8 decoding context

  1040.  * @param luma 1 for luma (Y) planes, 0 for chroma (Cb/Cr) planes

  1041.  * @param dst target buffer for block data at block position

  1042.  * @param src reference picture buffer at origin (0, 0)

  1043.  * @param mv motion vector (relative to block position) to get pixel data from

  1044.  * @param x_off horizontal position of block from origin (0, 0)

  1045.  * @param y_off vertical position of block from origin (0, 0)

  1046.  * @param block_w width of block (16, 8 or 4)

  1047.  * @param block_h height of block (always same as block_w)

  1048.  * @param width width of src/dst plane data

  1049.  * @param height height of src/dst plane data

  1050.  * @param linesize size of a single line of plane data, including padding

  1051.  * @param mc_func motion compensation function pointers (bilinear or sixtap MC)

  1052.  */

  1053. static av_always_inline

  1054. void vp8_mc_luma(VP8Context *s, uint8_t *dst, AVFrame *ref, const VP56mv *mv,

  1055.                  int x_off, int y_off, int block_w, int block_h,

  1056.                  int width, int height, int linesize,

  1057.                  vp8_mc_func mc_func[3][3])

  1058. {

  1059.     uint8_t *src = ref->data[0];

  1060. 

  1061.     if (AV_RN32A(mv)) {

  1062. 

  1063.         int mx = (mv->x << 1)&7, mx_idx = subpel_idx[0][mx];

  1064.         int my = (mv->y << 1)&7, my_idx = subpel_idx[0][my];

  1065. 

  1066.         x_off += mv->x >> 2;

  1067.         y_off += mv->y >> 2;

  1068. 

  1069.         // edge emulation

  1070.         ff_thread_await_progress(ref, (3 + y_off + block_h + subpel_idx[2][my]) >> 4, 0);

  1071.         src += y_off * linesize + x_off;

  1072.         if (x_off < mx_idx || x_off >= width  - block_w - subpel_idx[2][mx] ||

  1073.             y_off < my_idx || y_off >= height - block_h - subpel_idx[2][my]) {

  1074.             s->dsp.emulated_edge_mc(s->edge_emu_buffer, src - my_idx * linesize - mx_idx, linesize,

  1075.                                     block_w + subpel_idx[1][mx], block_h + subpel_idx[1][my],

  1076.                                     x_off - mx_idx, y_off - my_idx, width, height);

  1077.             src = s->edge_emu_buffer + mx_idx + linesize * my_idx;

  1078.         }

  1079.         mc_func[my_idx][mx_idx](dst, linesize, src, linesize, block_h, mx, my);

  1080.     } else {

  1081.         ff_thread_await_progress(ref, (3 + y_off + block_h) >> 4, 0);

  1082.         mc_func[0][0](dst, linesize, src + y_off * linesize + x_off, linesize, block_h, 0, 0);

  1083.     }

  1084. }

  1085. 

  1086. static av_always_inline

  1087. void vp8_mc_chroma(VP8Context *s, uint8_t *dst1, uint8_t *dst2, AVFrame *ref,

  1088.                    const VP56mv *mv, int x_off, int y_off,

  1089.                    int block_w, int block_h, int width, int height, int linesize,

  1090.                    vp8_mc_func mc_func[3][3])

  1091. {

  1092.     uint8_t *src1 = ref->data[1], *src2 = ref->data[2];

  1093. 

  1094.     if (AV_RN32A(mv)) {

  1095.         int mx = mv->x&7, mx_idx = subpel_idx[0][mx];

  1096.         int my = mv->y&7, my_idx = subpel_idx[0][my];

  1097. 

  1098.         x_off += mv->x >> 3;

  1099.         y_off += mv->y >> 3;

  1100. 

  1101.         // edge emulation

  1102.         src1 += y_off * linesize + x_off;

  1103.         src2 += y_off * linesize + x_off;

  1104.         ff_thread_await_progress(ref, (3 + y_off + block_h + subpel_idx[2][my]) >> 3, 0);

  1105.         if (x_off < mx_idx || x_off >= width  - block_w - subpel_idx[2][mx] ||

  1106.             y_off < my_idx || y_off >= height - block_h - subpel_idx[2][my]) {

  1107.             s->dsp.emulated_edge_mc(s->edge_emu_buffer, src1 - my_idx * linesize - mx_idx, linesize,

  1108.                                     block_w + subpel_idx[1][mx], block_h + subpel_idx[1][my],

  1109.                                     x_off - mx_idx, y_off - my_idx, width, height);

  1110.             src1 = s->edge_emu_buffer + mx_idx + linesize * my_idx;

  1111.             mc_func[my_idx][mx_idx](dst1, linesize, src1, linesize, block_h, mx, my);

  1112. 

  1113.             s->dsp.emulated_edge_mc(s->edge_emu_buffer, src2 - my_idx * linesize - mx_idx, linesize,

  1114.                                     block_w + subpel_idx[1][mx], block_h + subpel_idx[1][my],

  1115.                                     x_off - mx_idx, y_off - my_idx, width, height);

  1116.             src2 = s->edge_emu_buffer + mx_idx + linesize * my_idx;

  1117.             mc_func[my_idx][mx_idx](dst2, linesize, src2, linesize, block_h, mx, my);

  1118.         } else {

  1119.             mc_func[my_idx][mx_idx](dst1, linesize, src1, linesize, block_h, mx, my);

  1120.             mc_func[my_idx][mx_idx](dst2, linesize, src2, linesize, block_h, mx, my);

  1121.         }

  1122.     } else {

  1123.         ff_thread_await_progress(ref, (3 + y_off + block_h) >> 3, 0);

  1124.         mc_func[0][0](dst1, linesize, src1 + y_off * linesize + x_off, linesize, block_h, 0, 0);

  1125.         mc_func[0][0](dst2, linesize, src2 + y_off * linesize + x_off, linesize, block_h, 0, 0);

  1126.     }

  1127. }

  1128. 

  1129. static av_always_inline

  1130. void vp8_mc_part(VP8Context *s, uint8_t *dst[3],

  1131.                  AVFrame *ref_frame, int x_off, int y_off,

  1132.                  int bx_off, int by_off,

  1133.                  int block_w, int block_h,

  1134.                  int width, int height, VP56mv *mv)

  1135. {

  1136.     VP56mv uvmv = *mv;

  1137. 

  1138.     /* Y */

  1139.     vp8_mc_luma(s, dst[0] + by_off * s->linesize + bx_off,

  1140.                 ref_frame, mv, x_off + bx_off, y_off + by_off,

  1141.                 block_w, block_h, width, height, s->linesize,

  1142.                 s->put_pixels_tab[block_w == 8]);

  1143. 

  1144.     /* U/V */

  1145.     if (s->profile == 3) {

  1146.         uvmv.x &= ~7;

  1147.         uvmv.y &= ~7;

  1148.     }

  1149.     x_off   >>= 1; y_off   >>= 1;

  1150.     bx_off  >>= 1; by_off  >>= 1;

  1151.     width   >>= 1; height  >>= 1;

  1152.     block_w >>= 1; block_h >>= 1;

  1153.     vp8_mc_chroma(s, dst[1] + by_off * s->uvlinesize + bx_off,

  1154.                   dst[2] + by_off * s->uvlinesize + bx_off, ref_frame,

  1155.                   &uvmv, x_off + bx_off, y_off + by_off,

  1156.                   block_w, block_h, width, height, s->uvlinesize,

  1157.                   s->put_pixels_tab[1 + (block_w == 4)]);

  1158. }

  1159. 

  1160. /* Fetch pixels for estimated mv 4 macroblocks ahead.

  1161.  * Optimized for 64-byte cache lines.  Inspired by ffh264 prefetch_motion. */

  1162. static av_always_inline void prefetch_motion(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y, int mb_xy, int ref)

  1163. {

  1164.     /* Don't prefetch refs that haven't been used very often this frame. */

  1165.     if (s->ref_count[ref-1] > (mb_xy >> 5)) {

  1166.         int x_off = mb_x << 4, y_off = mb_y << 4;

  1167.         int mx = (mb->mv.x>>2) + x_off + 8;

  1168.         int my = (mb->mv.y>>2) + y_off;

  1169.         uint8_t **src= s->framep[ref]->data;

  1170.         int off= mx + (my + (mb_x&3)*4)*s->linesize + 64;

  1171.         /* For threading, a ff_thread_await_progress here might be useful, but

  1172.          * it actually slows down the decoder. Since a bad prefetch doesn't

  1173.          * generate bad decoder output, we don't run it here. */

  1174.         s->dsp.prefetch(src[0]+off, s->linesize, 4);

  1175.         off= (mx>>1) + ((my>>1) + (mb_x&7))*s->uvlinesize + 64;

  1176.         s->dsp.prefetch(src[1]+off, src[2]-src[1], 2);

  1177.     }

  1178. }

  1179. 

  1180. /**

  1181.  * Apply motion vectors to prediction buffer, chapter 18.

  1182.  */

  1183. static av_always_inline

  1184. void inter_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,

  1185.                    int mb_x, int mb_y)

  1186. {

  1187.     int x_off = mb_x << 4, y_off = mb_y << 4;

  1188.     int width = 16*s->mb_width, height = 16*s->mb_height;

  1189.     AVFrame *ref = s->framep[mb->ref_frame];

  1190.     VP56mv *bmv = mb->bmv;

  1191. 

  1192.     switch (mb->partitioning) {

  1193.     case VP8_SPLITMVMODE_NONE:

  1194.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1195.                     0, 0, 16, 16, width, height, &mb->mv);

  1196.         break;

  1197.     case VP8_SPLITMVMODE_4x4: {

  1198.         int x, y;

  1199.         VP56mv uvmv;

  1200. 

  1201.         /* Y */

  1202.         for (y = 0; y < 4; y++) {

  1203.             for (x = 0; x < 4; x++) {

  1204.                 vp8_mc_luma(s, dst[0] + 4*y*s->linesize + x*4,

  1205.                             ref, &bmv[4*y + x],

  1206.                             4*x + x_off, 4*y + y_off, 4, 4,

  1207.                             width, height, s->linesize,

  1208.                             s->put_pixels_tab[2]);

  1209.             }

  1210.         }

  1211. 

  1212.         /* U/V */

  1213.         x_off >>= 1; y_off >>= 1; width >>= 1; height >>= 1;

  1214.         for (y = 0; y < 2; y++) {

  1215.             for (x = 0; x < 2; x++) {

  1216.                 uvmv.x = mb->bmv[ 2*y    * 4 + 2*x  ].x +

  1217.                          mb->bmv[ 2*y    * 4 + 2*x+1].x +

  1218.                          mb->bmv[(2*y+1) * 4 + 2*x  ].x +

  1219.                          mb->bmv[(2*y+1) * 4 + 2*x+1].x;

  1220.                 uvmv.y = mb->bmv[ 2*y    * 4 + 2*x  ].y +

  1221.                          mb->bmv[ 2*y    * 4 + 2*x+1].y +

  1222.                          mb->bmv[(2*y+1) * 4 + 2*x  ].y +

  1223.                          mb->bmv[(2*y+1) * 4 + 2*x+1].y;

  1224.                 uvmv.x = (uvmv.x + 2 + (uvmv.x >> (INT_BIT-1))) >> 2;

  1225.                 uvmv.y = (uvmv.y + 2 + (uvmv.y >> (INT_BIT-1))) >> 2;

  1226.                 if (s->profile == 3) {

  1227.                     uvmv.x &= ~7;

  1228.                     uvmv.y &= ~7;

  1229.                 }

  1230.                 vp8_mc_chroma(s, dst[1] + 4*y*s->uvlinesize + x*4,

  1231.                               dst[2] + 4*y*s->uvlinesize + x*4, ref, &uvmv,

  1232.                               4*x + x_off, 4*y + y_off, 4, 4,

  1233.                               width, height, s->uvlinesize,

  1234.                               s->put_pixels_tab[2]);

  1235.             }

  1236.         }

  1237.         break;

  1238.     }

  1239.     case VP8_SPLITMVMODE_16x8:

  1240.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1241.                     0, 0, 16, 8, width, height, &bmv[0]);

  1242.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1243.                     0, 8, 16, 8, width, height, &bmv[1]);

  1244.         break;

  1245.     case VP8_SPLITMVMODE_8x16:

  1246.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1247.                     0, 0, 8, 16, width, height, &bmv[0]);

  1248.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1249.                     8, 0, 8, 16, width, height, &bmv[1]);

  1250.         break;

  1251.     case VP8_SPLITMVMODE_8x8:

  1252.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1253.                     0, 0, 8, 8, width, height, &bmv[0]);

  1254.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1255.                     8, 0, 8, 8, width, height, &bmv[1]);

  1256.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1257.                     0, 8, 8, 8, width, height, &bmv[2]);

  1258.         vp8_mc_part(s, dst, ref, x_off, y_off,

  1259.                     8, 8, 8, 8, width, height, &bmv[3]);

  1260.         break;

  1261.     }

  1262. }

  1263. 

  1264. static av_always_inline void idct_mb(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb)

  1265. {

  1266.     int x, y, ch;

  1267. 

  1268.     if (mb->mode != MODE_I4x4) {

  1269.         uint8_t *y_dst = dst[0];

  1270.         for (y = 0; y < 4; y++) {

  1271.             uint32_t nnz4 = AV_RL32(s->non_zero_count_cache[y]);

  1272.             if (nnz4) {

  1273.                 if (nnz4&~0x01010101) {

  1274.                     for (x = 0; x < 4; x++) {

  1275.                         if ((uint8_t)nnz4 == 1)

  1276.                             s->vp8dsp.vp8_idct_dc_add(y_dst+4*x, s->block[y][x], s->linesize);

  1277.                         else if((uint8_t)nnz4 > 1)

  1278.                             s->vp8dsp.vp8_idct_add(y_dst+4*x, s->block[y][x], s->linesize);

  1279.                         nnz4 >>= 8;

  1280.                         if (!nnz4)

  1281.                             break;

  1282.                     }

  1283.                 } else {

  1284.                     s->vp8dsp.vp8_idct_dc_add4y(y_dst, s->block[y], s->linesize);

  1285.                 }

  1286.             }

  1287.             y_dst += 4*s->linesize;

  1288.         }

  1289.     }

  1290. 

  1291.     for (ch = 0; ch < 2; ch++) {

  1292.         uint32_t nnz4 = AV_RL32(s->non_zero_count_cache[4+ch]);

  1293.         if (nnz4) {

  1294.             uint8_t *ch_dst = dst[1+ch];

  1295.             if (nnz4&~0x01010101) {

  1296.                 for (y = 0; y < 2; y++) {

  1297.                     for (x = 0; x < 2; x++) {

  1298.                         if ((uint8_t)nnz4 == 1)

  1299.                             s->vp8dsp.vp8_idct_dc_add(ch_dst+4*x, s->block[4+ch][(y<<1)+x], s->uvlinesize);

  1300.                         else if((uint8_t)nnz4 > 1)

  1301.                             s->vp8dsp.vp8_idct_add(ch_dst+4*x, s->block[4+ch][(y<<1)+x], s->uvlinesize);

  1302.                         nnz4 >>= 8;

  1303.                         if (!nnz4)

  1304.                             goto chroma_idct_end;

  1305.                     }

  1306.                     ch_dst += 4*s->uvlinesize;

  1307.                 }

  1308.             } else {

  1309.                 s->vp8dsp.vp8_idct_dc_add4uv(ch_dst, s->block[4+ch], s->uvlinesize);

  1310.             }

  1311.         }

  1312. chroma_idct_end: ;

  1313.     }

  1314. }

  1315. 

  1316. static av_always_inline void filter_level_for_mb(VP8Context *s, VP8Macroblock *mb, VP8FilterStrength *f )

  1317. {

  1318.     int interior_limit, filter_level;

  1319. 

  1320.     if (s->segmentation.enabled) {

  1321.         filter_level = s->segmentation.filter_level[s->segment];

  1322.         if (!s->segmentation.absolute_vals)

  1323.             filter_level += s->filter.level;

  1324.     } else

  1325.         filter_level = s->filter.level;

  1326. 

  1327.     if (s->lf_delta.enabled) {

  1328.         filter_level += s->lf_delta.ref[mb->ref_frame];

  1329.         filter_level += s->lf_delta.mode[mb->mode];

  1330.     }

  1331. 

  1332. /* Like av_clip for inputs 0 and max, where max is equal to (2^n-1) */

  1333. #define POW2CLIP(x,max) (((x) & ~max) ? (-(x))>>31 & max : (x));

  1334.     filter_level = POW2CLIP(filter_level, 63);

  1335. 

  1336.     interior_limit = filter_level;

  1337.     if (s->filter.sharpness) {

  1338.         interior_limit >>= (s->filter.sharpness + 3) >> 2;

  1339.         interior_limit = FFMIN(interior_limit, 9 - s->filter.sharpness);

  1340.     }

  1341.     interior_limit = FFMAX(interior_limit, 1);

  1342. 

  1343.     f->filter_level = filter_level;

  1344.     f->inner_limit = interior_limit;

  1345.     f->inner_filter = !mb->skip || mb->mode == MODE_I4x4 || mb->mode == VP8_MVMODE_SPLIT;

  1346. }

  1347. 

  1348. static av_always_inline void filter_mb(VP8Context *s, uint8_t *dst[3], VP8FilterStrength *f, int mb_x, int mb_y)

  1349. {

  1350.     int mbedge_lim, bedge_lim, hev_thresh;

  1351.     int filter_level = f->filter_level;

  1352.     int inner_limit = f->inner_limit;

  1353.     int inner_filter = f->inner_filter;

  1354.     int linesize = s->linesize;

  1355.     int uvlinesize = s->uvlinesize;

  1356.     static const uint8_t hev_thresh_lut[2][64] = {

  1357.         { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,

  1358.           2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  1359.           3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  1360.           3, 3, 3, 3 },

  1361.         { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,

  1362.           1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  1363.           2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  1364.           2, 2, 2, 2 }

  1365.     };

  1366. 

  1367.     if (!filter_level)

  1368.         return;

  1369. 

  1370.      bedge_lim = 2*filter_level + inner_limit;

  1371.     mbedge_lim = bedge_lim + 4;

  1372. 

  1373.     hev_thresh = hev_thresh_lut[s->keyframe][filter_level];

  1374. 

  1375.     if (mb_x) {

  1376.         s->vp8dsp.vp8_h_loop_filter16y(dst[0],     linesize,

  1377.                                        mbedge_lim, inner_limit, hev_thresh);

  1378.         s->vp8dsp.vp8_h_loop_filter8uv(dst[1],     dst[2],      uvlinesize,

  1379.                                        mbedge_lim, inner_limit, hev_thresh);

  1380.     }

  1381. 

  1382.     if (inner_filter) {

  1383.         s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+ 4, linesize, bedge_lim,

  1384.                                              inner_limit, hev_thresh);

  1385.         s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+ 8, linesize, bedge_lim,

  1386.                                              inner_limit, hev_thresh);

  1387.         s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+12, linesize, bedge_lim,

  1388.                                              inner_limit, hev_thresh);

  1389.         s->vp8dsp.vp8_h_loop_filter8uv_inner(dst[1] + 4, dst[2] + 4,

  1390.                                              uvlinesize,  bedge_lim,

  1391.                                              inner_limit, hev_thresh);

  1392.     }

  1393. 

  1394.     if (mb_y) {

  1395.         s->vp8dsp.vp8_v_loop_filter16y(dst[0],     linesize,

  1396.                                        mbedge_lim, inner_limit, hev_thresh);

  1397.         s->vp8dsp.vp8_v_loop_filter8uv(dst[1],     dst[2],      uvlinesize,

  1398.                                        mbedge_lim, inner_limit, hev_thresh);

  1399.     }

  1400. 

  1401.     if (inner_filter) {

  1402.         s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+ 4*linesize,

  1403.                                              linesize,    bedge_lim,

  1404.                                              inner_limit, hev_thresh);

  1405.         s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+ 8*linesize,

  1406.                                              linesize,    bedge_lim,

  1407.                                              inner_limit, hev_thresh);

  1408.         s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+12*linesize,

  1409.                                              linesize,    bedge_lim,

  1410.                                              inner_limit, hev_thresh);

  1411.         s->vp8dsp.vp8_v_loop_filter8uv_inner(dst[1] + 4 * uvlinesize,

  1412.                                              dst[2] + 4 * uvlinesize,

  1413.                                              uvlinesize,  bedge_lim,

  1414.                                              inner_limit, hev_thresh);

  1415.     }

  1416. }

  1417. 

  1418. static av_always_inline void filter_mb_simple(VP8Context *s, uint8_t *dst, VP8FilterStrength *f, int mb_x, int mb_y)

  1419. {

  1420.     int mbedge_lim, bedge_lim;

  1421.     int filter_level = f->filter_level;

  1422.     int inner_limit = f->inner_limit;

  1423.     int inner_filter = f->inner_filter;

  1424.     int linesize = s->linesize;

  1425. 

  1426.     if (!filter_level)

  1427.         return;

  1428. 

  1429.      bedge_lim = 2*filter_level + inner_limit;

  1430.     mbedge_lim = bedge_lim + 4;

  1431. 

  1432.     if (mb_x)

  1433.         s->vp8dsp.vp8_h_loop_filter_simple(dst, linesize, mbedge_lim);

  1434.     if (inner_filter) {

  1435.         s->vp8dsp.vp8_h_loop_filter_simple(dst+ 4, linesize, bedge_lim);

  1436.         s->vp8dsp.vp8_h_loop_filter_simple(dst+ 8, linesize, bedge_lim);

  1437.         s->vp8dsp.vp8_h_loop_filter_simple(dst+12, linesize, bedge_lim);

  1438.     }

  1439. 

  1440.     if (mb_y)

  1441.         s->vp8dsp.vp8_v_loop_filter_simple(dst, linesize, mbedge_lim);

  1442.     if (inner_filter) {

  1443.         s->vp8dsp.vp8_v_loop_filter_simple(dst+ 4*linesize, linesize, bedge_lim);

  1444.         s->vp8dsp.vp8_v_loop_filter_simple(dst+ 8*linesize, linesize, bedge_lim);

  1445.         s->vp8dsp.vp8_v_loop_filter_simple(dst+12*linesize, linesize, bedge_lim);

  1446.     }

  1447. }

  1448. 

  1449. static void filter_mb_row(VP8Context *s, AVFrame *curframe, int mb_y)

  1450. {

  1451.     VP8FilterStrength *f = s->filter_strength;

  1452.     uint8_t *dst[3] = {

  1453.         curframe->data[0] + 16*mb_y*s->linesize,

  1454.         curframe->data[1] +  8*mb_y*s->uvlinesize,

  1455.         curframe->data[2] +  8*mb_y*s->uvlinesize

  1456.     };

  1457.     int mb_x;

  1458. 

  1459.     for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1460.         backup_mb_border(s->top_border[mb_x+1], dst[0], dst[1], dst[2], s->linesize, s->uvlinesize, 0);

  1461.         filter_mb(s, dst, f++, mb_x, mb_y);

  1462.         dst[0] += 16;

  1463.         dst[1] += 8;

  1464.         dst[2] += 8;

  1465.     }

  1466. }

  1467. 

  1468. static void filter_mb_row_simple(VP8Context *s, AVFrame *curframe, int mb_y)

  1469. {

  1470.     VP8FilterStrength *f = s->filter_strength;

  1471.     uint8_t *dst = curframe->data[0] + 16*mb_y*s->linesize;

  1472.     int mb_x;

  1473. 

  1474.     for (mb_x = 0; mb_x < s->mb_width; mb_x++) {

  1475.         backup_mb_border(s->top_border[mb_x+1], dst, NULL, NULL, s->linesize, 0, 1);

  1476.         filter_mb_simple(s, dst, f++, mb_x, mb_y);

  1477.         dst += 16;

  1478.     }

  1479. }

  1480. 

  1481. static int vp8_decode_frame(AVCodecContext *avctx, void *data, int *data_size,

  1482.                             AVPacket *avpkt)

  1483. {

  1484.     VP8Context *s = avctx->priv_data;

  1485.     int ret, mb_x, mb_y, i, y, referenced;

  1486.     enum AVDiscard skip_thresh;

  1487.     AVFrame *av_uninit(curframe), *prev_frame = s->framep[VP56_FRAME_CURRENT];

  1488. 

  1489.     if ((ret = decode_frame_header(s, avpkt->data, avpkt->size)) < 0)

  1490.         return ret;

  1491. 

  1492.     referenced = s->update_last || s->update_golden == VP56_FRAME_CURRENT

  1493.                                 || s->update_altref == VP56_FRAME_CURRENT;

  1494. 

  1495.     skip_thresh = !referenced ? AVDISCARD_NONREF :

  1496.                     !s->keyframe ? AVDISCARD_NONKEY : AVDISCARD_ALL;

  1497. 

  1498.     if (avctx->skip_frame >= skip_thresh) {

  1499.         s->invisible = 1;

  1500.         goto skip_decode;

  1501.     }

  1502.     s->deblock_filter = s->filter.level && avctx->skip_loop_filter < skip_thresh;

  1503. 

  1504.     // release no longer referenced frames

  1505.     for (i = 0; i < 5; i++)

  1506.         if (s->frames[i].data[0] &&

  1507.             &s->frames[i] != prev_frame &&

  1508.             &s->frames[i] != s->framep[VP56_FRAME_PREVIOUS] &&

  1509.             &s->frames[i] != s->framep[VP56_FRAME_GOLDEN] &&

  1510.             &s->frames[i] != s->framep[VP56_FRAME_GOLDEN2])

  1511.             ff_thread_release_buffer(avctx, &s->frames[i]);

  1512. 

  1513.     // find a free buffer

  1514.     for (i = 0; i < 5; i++)

  1515.         if (&s->frames[i] != prev_frame &&

  1516.             &s->frames[i] != s->framep[VP56_FRAME_PREVIOUS] &&

  1517.             &s->frames[i] != s->framep[VP56_FRAME_GOLDEN] &&

  1518.             &s->frames[i] != s->framep[VP56_FRAME_GOLDEN2]) {

  1519.             curframe = s->framep[VP56_FRAME_CURRENT] = &s->frames[i];

  1520.             break;

  1521.         }

  1522.     if (i == 5) {

  1523.         av_log(avctx, AV_LOG_FATAL, "Ran out of free frames!\n");

  1524.         abort();

  1525.     }

  1526.     if (curframe->data[0])

  1527.         ff_thread_release_buffer(avctx, curframe);

  1528. 

  1529.     curframe->key_frame = s->keyframe;

  1530.     curframe->pict_type = s->keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;

  1531.     curframe->reference = referenced ? 3 : 0;

  1532.     curframe->ref_index[0] = s->segmentation_map;

  1533.     if ((ret = ff_thread_get_buffer(avctx, curframe))) {

  1534.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed!\n");

  1535.         return ret;

  1536.     }

  1537. 

  1538.     // check if golden and altref are swapped

  1539.     if (s->update_altref != VP56_FRAME_NONE) {

  1540.         s->next_framep[VP56_FRAME_GOLDEN2]  = s->framep[s->update_altref];

  1541.     } else {

  1542.         s->next_framep[VP56_FRAME_GOLDEN2]  = s->framep[VP56_FRAME_GOLDEN2];

  1543.     }

  1544.     if (s->update_golden != VP56_FRAME_NONE) {

  1545.         s->next_framep[VP56_FRAME_GOLDEN]   = s->framep[s->update_golden];

  1546.     } else {

  1547.         s->next_framep[VP56_FRAME_GOLDEN]   = s->framep[VP56_FRAME_GOLDEN];

  1548.     }

  1549.     if (s->update_last) {

  1550.         s->next_framep[VP56_FRAME_PREVIOUS] = curframe;

  1551.     } else {

  1552.         s->next_framep[VP56_FRAME_PREVIOUS] = s->framep[VP56_FRAME_PREVIOUS];

  1553.     }

  1554.     s->next_framep[VP56_FRAME_CURRENT]      = curframe;

  1555. 

  1556.     ff_thread_finish_setup(avctx);

  1557. 

  1558.     // Given that arithmetic probabilities are updated every frame, it's quite likely

  1559.     // that the values we have on a random interframe are complete junk if we didn't

  1560.     // start decode on a keyframe. So just don't display anything rather than junk.

  1561.     if (!s->keyframe && (!s->framep[VP56_FRAME_PREVIOUS] ||

  1562.                          !s->framep[VP56_FRAME_GOLDEN] ||

  1563.                          !s->framep[VP56_FRAME_GOLDEN2])) {

  1564.         av_log(avctx, AV_LOG_WARNING, "Discarding interframe without a prior keyframe!\n");

  1565.         return AVERROR_INVALIDDATA;

  1566.     }

  1567. 

  1568.     s->linesize   = curframe->linesize[0];

  1569.     s->uvlinesize = curframe->linesize[1];

  1570. 

  1571.     if (!s->edge_emu_buffer)

  1572.         s->edge_emu_buffer = av_malloc(21*s->linesize);

  1573. 

  1574.     memset(s->top_nnz, 0, s->mb_width*sizeof(*s->top_nnz));

  1575. 

  1576.     /* Zero macroblock structures for top/top-left prediction from outside the frame. */

  1577.     memset(s->macroblocks + s->mb_height*2 - 1, 0, (s->mb_width+1)*sizeof(*s->macroblocks));

  1578. 

  1579.     // top edge of 127 for intra prediction

  1580.     if (!(avctx->flags & CODEC_FLAG_EMU_EDGE)) {

  1581.         s->top_border[0][15] = s->top_border[0][23] = 127;

  1582.         memset(s->top_border[1]-1, 127, s->mb_width*sizeof(*s->top_border)+1);

  1583.     }

  1584.     memset(s->ref_count, 0, sizeof(s->ref_count));

  1585.     if (s->keyframe)

  1586.         memset(s->intra4x4_pred_mode_top, DC_PRED, s->mb_width*4);

  1587. 

  1588. #define MARGIN (16 << 2)

  1589.     s->mv_min.y = -MARGIN;

  1590.     s->mv_max.y = ((s->mb_height - 1) << 6) + MARGIN;

  1591. 

  1592.     for (mb_y = 0; mb_y < s->mb_height; mb_y++) {

  1593.         VP56RangeCoder *c = &s->coeff_partition[mb_y & (s->num_coeff_partitions-1)];

  1594.         VP8Macroblock *mb = s->macroblocks + (s->mb_height - mb_y - 1)*2;

  1595.         int mb_xy = mb_y*s->mb_width;

  1596.         uint8_t *dst[3] = {

  1597.             curframe->data[0] + 16*mb_y*s->linesize,

  1598.             curframe->data[1] +  8*mb_y*s->uvlinesize,

  1599.             curframe->data[2] +  8*mb_y*s->uvlinesize

  1600.         };

  1601. 

  1602.         memset(mb - 1, 0, sizeof(*mb));   // zero left macroblock

  1603.         memset(s->left_nnz, 0, sizeof(s->left_nnz));

  1604.         AV_WN32A(s->intra4x4_pred_mode_left, DC_PRED*0x01010101);

  1605. 

  1606.         // left edge of 129 for intra prediction

  1607.         if (!(avctx->flags & CODEC_FLAG_EMU_EDGE)) {

  1608.             for (i = 0; i < 3; i++)

  1609.                 for (y = 0; y < 16>>!!i; y++)

  1610.                     dst[i][y*curframe->linesize[i]-1] = 129;

  1611.             if (mb_y == 1) // top left edge is also 129

  1612.                 s->top_border[0][15] = s->top_border[0][23] = s->top_border[0][31] = 129;

  1613.         }

  1614. 

  1615.         s->mv_min.x = -MARGIN;

  1616.         s->mv_max.x = ((s->mb_width  - 1) << 6) + MARGIN;

  1617.         if (prev_frame && s->segmentation.enabled && s->segmentation.update_map)

  1618.             ff_thread_await_progress(prev_frame, mb_y, 0);

  1619. 

  1620.         for (mb_x = 0; mb_x < s->mb_width; mb_x++, mb_xy++, mb++) {

  1621.             /* Prefetch the current frame, 4 MBs ahead */

  1622.             s->dsp.prefetch(dst[0] + (mb_x&3)*4*s->linesize + 64, s->linesize, 4);

  1623.             s->dsp.prefetch(dst[1] + (mb_x&7)*s->uvlinesize + 64, dst[2] - dst[1], 2);

  1624. 

  1625.             decode_mb_mode(s, mb, mb_x, mb_y, s->segmentation_map + mb_xy,

  1626.                            prev_frame ? prev_frame->ref_index[0] + mb_xy : NULL);

  1627. 

  1628.             prefetch_motion(s, mb, mb_x, mb_y, mb_xy, VP56_FRAME_PREVIOUS);

  1629. 

  1630.             if (!mb->skip)

  1631.                 decode_mb_coeffs(s, c, mb, s->top_nnz[mb_x], s->left_nnz);

  1632. 

  1633.             if (mb->mode <= MODE_I4x4)

  1634.                 intra_predict(s, dst, mb, mb_x, mb_y);

  1635.             else

  1636.                 inter_predict(s, dst, mb, mb_x, mb_y);

  1637. 

  1638.             prefetch_motion(s, mb, mb_x, mb_y, mb_xy, VP56_FRAME_GOLDEN);

  1639. 

  1640.             if (!mb->skip) {

  1641.                 idct_mb(s, dst, mb);

  1642.             } else {

  1643.                 AV_ZERO64(s->left_nnz);

  1644.                 AV_WN64(s->top_nnz[mb_x], 0);   // array of 9, so unaligned

  1645. 

  1646.                 // Reset DC block predictors if they would exist if the mb had coefficients

  1647.                 if (mb->mode != MODE_I4x4 && mb->mode != VP8_MVMODE_SPLIT) {

  1648.                     s->left_nnz[8]      = 0;

  1649.                     s->top_nnz[mb_x][8] = 0;

  1650.                 }

  1651.             }

  1652. 

  1653.             if (s->deblock_filter)

  1654.                 filter_level_for_mb(s, mb, &s->filter_strength[mb_x]);

  1655. 

  1656.             prefetch_motion(s, mb, mb_x, mb_y, mb_xy, VP56_FRAME_GOLDEN2);

  1657. 

  1658.             dst[0] += 16;

  1659.             dst[1] += 8;

  1660.             dst[2] += 8;

  1661.             s->mv_min.x -= 64;

  1662.             s->mv_max.x -= 64;

  1663.         }

  1664.         if (s->deblock_filter) {

  1665.             if (s->filter.simple)

  1666.                 filter_mb_row_simple(s, curframe, mb_y);

  1667.             else

  1668.                 filter_mb_row(s, curframe, mb_y);

  1669.         }

  1670.         s->mv_min.y -= 64;

  1671.         s->mv_max.y -= 64;

  1672. 

  1673.         ff_thread_report_progress(curframe, mb_y, 0);

  1674.     }

  1675. 

  1676.     ff_thread_report_progress(curframe, INT_MAX, 0);

  1677. skip_decode:

  1678.     // if future frames don't use the updated probabilities,

  1679.     // reset them to the values we saved

  1680.     if (!s->update_probabilities)

  1681.         s->prob[0] = s->prob[1];

  1682. 

  1683.     memcpy(&s->framep[0], &s->next_framep[0], sizeof(s->framep[0]) * 4);

  1684. 

  1685.     if (!s->invisible) {

  1686.         *(AVFrame*)data = *curframe;

  1687.         *data_size = sizeof(AVFrame);

  1688.     }

  1689. 

  1690.     return avpkt->size;

  1691. }

  1692. 

  1693. static av_cold int vp8_decode_init(AVCodecContext *avctx)

  1694. {

  1695.     VP8Context *s = avctx->priv_data;

  1696. 

  1697.     s->avctx = avctx;

  1698.     avctx->pix_fmt = PIX_FMT_YUV420P;

  1699. 

  1700.     dsputil_init(&s->dsp, avctx);

  1701.     ff_h264_pred_init(&s->hpc, CODEC_ID_VP8);

  1702.     ff_vp8dsp_init(&s->vp8dsp);

  1703. 

  1704.     return 0;

  1705. }

  1706. 

  1707. static av_cold int vp8_decode_free(AVCodecContext *avctx)

  1708. {

  1709.     vp8_decode_flush(avctx);

  1710.     return 0;

  1711. }

  1712. 

  1713. static av_cold int vp8_decode_init_thread_copy(AVCodecContext *avctx)

  1714. {

  1715.     VP8Context *s = avctx->priv_data;

  1716. 

  1717.     s->avctx = avctx;

  1718. 

  1719.     return 0;

  1720. }

  1721. 

  1722. #define REBASE(pic) \

  1723.     pic ? pic - &s_src->frames[0] + &s->frames[0] : NULL

  1724. 

  1725. static int vp8_decode_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)

  1726. {

  1727.     VP8Context *s = dst->priv_data, *s_src = src->priv_data;

  1728. 

  1729.     s->prob[0] = s_src->prob[!s_src->update_probabilities];

  1730.     s->segmentation = s_src->segmentation;

  1731.     s->lf_delta = s_src->lf_delta;

  1732.     memcpy(s->sign_bias, s_src->sign_bias, sizeof(s->sign_bias));

  1733. 

  1734.     memcpy(&s->frames, &s_src->frames, sizeof(s->frames));

  1735.     s->framep[0] = REBASE(s_src->next_framep[0]);

  1736.     s->framep[1] = REBASE(s_src->next_framep[1]);

  1737.     s->framep[2] = REBASE(s_src->next_framep[2]);

  1738.     s->framep[3] = REBASE(s_src->next_framep[3]);

  1739. 

  1740.     return 0;

  1741. }

  1742. 

  1743. AVCodec ff_vp8_decoder = {

  1744.     "vp8",

  1745.     AVMEDIA_TYPE_VIDEO,

  1746.     CODEC_ID_VP8,

  1747.     sizeof(VP8Context),

  1748.     vp8_decode_init,

  1749.     NULL,

  1750.     vp8_decode_free,

  1751.     vp8_decode_frame,

  1752.     CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,

  1753.     .flush = vp8_decode_flush,

  1754.     .long_name = NULL_IF_CONFIG_SMALL("On2 VP8"),

  1755.     .init_thread_copy      = ONLY_IF_THREADS_ENABLED(vp8_decode_init_thread_copy),

  1756.     .update_thread_context = ONLY_IF_THREADS_ENABLED(vp8_decode_update_thread_context),

  1757. };