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FFmpeg/libavcodec/vp6.c

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  1. /**

  2.  * @file vp6.c

  3.  * VP6 compatible video decoder

  4.  *

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

  6.  *

  7.  * The VP6F decoder accepts an optional 1 byte extradata. It is composed of:

  8.  *  - upper 4bits: difference between encoded width and visible width

  9.  *  - lower 4bits: difference between encoded height and visible height

  10.  *

  11.  * This file is part of FFmpeg.

  12.  *

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

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

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

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

  17.  *

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

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

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

  21.  * Lesser General Public License for more details.

  22.  *

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

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

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

  26.  */

  27. 

  28. #include <stdlib.h>

  29. 

  30. #include "avcodec.h"

  31. #include "dsputil.h"

  32. #include "bitstream.h"

  33. #include "mpegvideo.h"

  34. 

  35. #include "vp56.h"

  36. #include "vp56data.h"

  37. #include "vp6data.h"

  38. 

  39. 

  40. static int vp6_parse_header(vp56_context_t *s, uint8_t *buf, int buf_size,

  41.                             int *golden_frame)

  42. {

  43.     vp56_range_coder_t *c = &s->c;

  44.     int parse_filter_info = 0;

  45.     int coeff_offset = 0;

  46.     int vrt_shift = 0;

  47.     int sub_version;

  48.     int rows, cols;

  49.     int res = 1;

  50.     int separated_coeff = buf[0] & 1;

  51. 

  52.     s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);

  53.     vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);

  54. 

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

  56.         sub_version = buf[1] >> 3;

  57.         if (sub_version > 8)

  58.             return 0;

  59.         s->filter_header = buf[1] & 0x06;

  60.         if (buf[1] & 1) {

  61.             av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");

  62.             return 0;

  63.         }

  64.         if (separated_coeff || !s->filter_header) {

  65.             coeff_offset = AV_RB16(buf+2) - 2;

  66.             buf += 2;

  67.             buf_size -= 2;

  68.         }

  69. 

  70.         rows = buf[2];  /* number of stored macroblock rows */

  71.         cols = buf[3];  /* number of stored macroblock cols */

  72.         /* buf[4] is number of displayed macroblock rows */

  73.         /* buf[5] is number of displayed macroblock cols */

  74. 

  75.         if (16*cols != s->avctx->coded_width ||

  76.             16*rows != s->avctx->coded_height) {

  77.             avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);

  78.             if (s->avctx->extradata_size == 1) {

  79.                 s->avctx->width  -= s->avctx->extradata[0] >> 4;

  80.                 s->avctx->height -= s->avctx->extradata[0] & 0x0F;

  81.             }

  82.             res = 2;

  83.         }

  84. 

  85.         vp56_init_range_decoder(c, buf+6, buf_size-6);

  86.         vp56_rac_gets(c, 2);

  87. 

  88.         parse_filter_info = s->filter_header;

  89.         if (sub_version < 8)

  90.             vrt_shift = 5;

  91.         s->sub_version = sub_version;

  92.     } else {

  93.         if (!s->sub_version)

  94.             return 0;

  95. 

  96.         if (separated_coeff || !s->filter_header) {

  97.             coeff_offset = AV_RB16(buf+1) - 2;

  98.             buf += 2;

  99.             buf_size -= 2;

  100.         }

  101.         vp56_init_range_decoder(c, buf+1, buf_size-1);

  102. 

  103.         *golden_frame = vp56_rac_get(c);

  104.         if (s->filter_header) {

  105.             s->deblock_filtering = vp56_rac_get(c);

  106.             if (s->deblock_filtering)

  107.                 vp56_rac_get(c);

  108.             if (s->sub_version > 7)

  109.                 parse_filter_info = vp56_rac_get(c);

  110.         }

  111.     }

  112. 

  113.     if (parse_filter_info) {

  114.         if (vp56_rac_get(c)) {

  115.             s->filter_mode = 2;

  116.             s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;

  117.             s->max_vector_length = 2 << vp56_rac_gets(c, 3);

  118.         } else if (vp56_rac_get(c)) {

  119.             s->filter_mode = 1;

  120.         } else {

  121.             s->filter_mode = 0;

  122.         }

  123.         if (s->sub_version > 7)

  124.             s->filter_selection = vp56_rac_gets(c, 4);

  125.         else

  126.             s->filter_selection = 16;

  127.     }

  128. 

  129.     vp56_rac_get(c);

  130. 

  131.     if (coeff_offset) {

  132.         vp56_init_range_decoder(&s->cc, buf+coeff_offset,

  133.                                 buf_size-coeff_offset);

  134.         s->ccp = &s->cc;

  135.     } else {

  136.         s->ccp = &s->c;

  137.     }

  138. 

  139.     return res;

  140. }

  141. 

  142. static void vp6_coeff_order_table_init(vp56_context_t *s)

  143. {

  144.     int i, pos, idx = 1;

  145. 

  146.     s->coeff_index_to_pos[0] = 0;

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

  148.         for (pos=1; pos<64; pos++)

  149.             if (s->coeff_reorder[pos] == i)

  150.                 s->coeff_index_to_pos[idx++] = pos;

  151. }

  152. 

  153. static void vp6_default_models_init(vp56_context_t *s)

  154. {

  155.     s->vector_model_dct[0] = 0xA2;

  156.     s->vector_model_dct[1] = 0xA4;

  157.     s->vector_model_sig[0] = 0x80;

  158.     s->vector_model_sig[1] = 0x80;

  159. 

  160.     memcpy(s->mb_types_stats, vp56_def_mb_types_stats, sizeof(s->mb_types_stats));

  161.     memcpy(s->vector_model_fdv, vp6_def_fdv_vector_model, sizeof(s->vector_model_fdv));

  162.     memcpy(s->vector_model_pdv, vp6_def_pdv_vector_model, sizeof(s->vector_model_pdv));

  163.     memcpy(s->coeff_model_runv, vp6_def_runv_coeff_model, sizeof(s->coeff_model_runv));

  164.     memcpy(s->coeff_reorder, vp6_def_coeff_reorder, sizeof(s->coeff_reorder));

  165. 

  166.     vp6_coeff_order_table_init(s);

  167. }

  168. 

  169. static void vp6_parse_vector_models(vp56_context_t *s)

  170. {

  171.     vp56_range_coder_t *c = &s->c;

  172.     int comp, node;

  173. 

  174.     for (comp=0; comp<2; comp++) {

  175.         if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0]))

  176.             s->vector_model_dct[comp] = vp56_rac_gets_nn(c, 7);

  177.         if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))

  178.             s->vector_model_sig[comp] = vp56_rac_gets_nn(c, 7);

  179.     }

  180. 

  181.     for (comp=0; comp<2; comp++)

  182.         for (node=0; node<7; node++)

  183.             if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))

  184.                 s->vector_model_pdv[comp][node] = vp56_rac_gets_nn(c, 7);

  185. 

  186.     for (comp=0; comp<2; comp++)

  187.         for (node=0; node<8; node++)

  188.             if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))

  189.                 s->vector_model_fdv[comp][node] = vp56_rac_gets_nn(c, 7);

  190. }

  191. 

  192. static void vp6_parse_coeff_models(vp56_context_t *s)

  193. {

  194.     vp56_range_coder_t *c = &s->c;

  195.     int def_prob[11];

  196.     int node, cg, ctx, pos;

  197.     int ct;    /* code type */

  198.     int pt;    /* plane type (0 for Y, 1 for U or V) */

  199. 

  200.     memset(def_prob, 0x80, sizeof(def_prob));

  201. 

  202.     for (pt=0; pt<2; pt++)

  203.         for (node=0; node<11; node++)

  204.             if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) {

  205.                 def_prob[node] = vp56_rac_gets_nn(c, 7);

  206.                 s->coeff_model_dccv[pt][node] = def_prob[node];

  207.             } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {

  208.                 s->coeff_model_dccv[pt][node] = def_prob[node];

  209.             }

  210. 

  211.     if (vp56_rac_get(c)) {

  212.         for (pos=1; pos<64; pos++)

  213.             if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))

  214.                 s->coeff_reorder[pos] = vp56_rac_gets(c, 4);

  215.         vp6_coeff_order_table_init(s);

  216.     }

  217. 

  218.     for (cg=0; cg<2; cg++)

  219.         for (node=0; node<14; node++)

  220.             if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))

  221.                 s->coeff_model_runv[cg][node] = vp56_rac_gets_nn(c, 7);

  222. 

  223.     for (ct=0; ct<3; ct++)

  224.         for (pt=0; pt<2; pt++)

  225.             for (cg=0; cg<6; cg++)

  226.                 for (node=0; node<11; node++)

  227.                     if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) {

  228.                         def_prob[node] = vp56_rac_gets_nn(c, 7);

  229.                         s->coeff_model_ract[pt][ct][cg][node] = def_prob[node];

  230.                     } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {

  231.                         s->coeff_model_ract[pt][ct][cg][node] = def_prob[node];

  232.                     }

  233. 

  234.     /* coeff_model_dcct is a linear combination of coeff_model_dccv */

  235.     for (pt=0; pt<2; pt++)

  236.         for (ctx=0; ctx<3; ctx++)

  237.             for (node=0; node<5; node++)

  238.                 s->coeff_model_dcct[pt][ctx][node] = av_clip(((s->coeff_model_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);

  239. }

  240. 

  241. static void vp6_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)

  242. {

  243.     vp56_range_coder_t *c = &s->c;

  244.     int comp;

  245. 

  246.     *vect = (vp56_mv_t) {0,0};

  247.     if (s->vector_candidate_pos < 2)

  248.         *vect = s->vector_candidate[0];

  249. 

  250.     for (comp=0; comp<2; comp++) {

  251.         int i, delta = 0;

  252. 

  253.         if (vp56_rac_get_prob(c, s->vector_model_dct[comp])) {

  254.             static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};

  255.             for (i=0; i<sizeof(prob_order); i++) {

  256.                 int j = prob_order[i];

  257.                 delta |= vp56_rac_get_prob(c, s->vector_model_fdv[comp][j])<<j;

  258.             }

  259.             if (delta & 0xF0)

  260.                 delta |= vp56_rac_get_prob(c, s->vector_model_fdv[comp][3])<<3;

  261.             else

  262.                 delta |= 8;

  263.         } else {

  264.             delta = vp56_rac_get_tree(c, vp56_pva_tree,

  265.                                       s->vector_model_pdv[comp]);

  266.         }

  267. 

  268.         if (delta && vp56_rac_get_prob(c, s->vector_model_sig[comp]))

  269.             delta = -delta;

  270. 

  271.         if (!comp)

  272.             vect->x += delta;

  273.         else

  274.             vect->y += delta;

  275.     }

  276. }

  277. 

  278. static void vp6_parse_coeff(vp56_context_t *s)

  279. {

  280.     vp56_range_coder_t *c = s->ccp;

  281.     uint8_t *permute = s->scantable.permutated;

  282.     uint8_t *model, *model2, *model3;

  283.     int coeff, sign, coeff_idx;

  284.     int b, i, cg, idx, ctx;

  285.     int pt = 0;    /* plane type (0 for Y, 1 for U or V) */

  286. 

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

  288.         int ct = 1;    /* code type */

  289.         int run = 1;

  290. 

  291.         if (b > 3) pt = 1;

  292. 

  293.         ctx = s->left_block[vp56_b6to4[b]].not_null_dc

  294.               + s->above_blocks[s->above_block_idx[b]].not_null_dc;

  295.         model = s->coeff_model_dccv[pt];

  296.         model2 = s->coeff_model_dcct[pt][ctx];

  297. 

  298.         for (coeff_idx=0; coeff_idx<64; ) {

  299.             if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {

  300.                 /* parse a coeff */

  301.                 if (vp56_rac_get_prob(c, model2[2])) {

  302.                     if (vp56_rac_get_prob(c, model2[3])) {

  303.                         idx = vp56_rac_get_tree(c, vp56_pc_tree, model);

  304.                         coeff = vp56_coeff_bias[idx];

  305.                         for (i=vp56_coeff_bit_length[idx]; i>=0; i--)

  306.                             coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;

  307.                     } else {

  308.                         if (vp56_rac_get_prob(c, model2[4]))

  309.                             coeff = 3 + vp56_rac_get_prob(c, model[5]);

  310.                         else

  311.                             coeff = 2;

  312.                     }

  313.                     ct = 2;

  314.                 } else {

  315.                     ct = 1;

  316.                     coeff = 1;

  317.                 }

  318.                 sign = vp56_rac_get(c);

  319.                 coeff = (coeff ^ -sign) + sign;

  320.                 if (coeff_idx)

  321.                     coeff *= s->dequant_ac;

  322.                 idx = s->coeff_index_to_pos[coeff_idx];

  323.                 s->block_coeff[b][permute[idx]] = coeff;

  324.                 run = 1;

  325.             } else {

  326.                 /* parse a run */

  327.                 ct = 0;

  328.                 if (coeff_idx > 0) {

  329.                     if (!vp56_rac_get_prob(c, model2[1]))

  330.                         break;

  331. 

  332.                     model3 = s->coeff_model_runv[coeff_idx >= 6];

  333.                     run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);

  334.                     if (!run)

  335.                         for (run=9, i=0; i<6; i++)

  336.                             run += vp56_rac_get_prob(c, model3[i+8]) << i;

  337.                 }

  338.             }

  339. 

  340.             cg = vp6_coeff_groups[coeff_idx+=run];

  341.             model = model2 = s->coeff_model_ract[pt][ct][cg];

  342.         }

  343. 

  344.         s->left_block[vp56_b6to4[b]].not_null_dc =

  345.         s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];

  346.     }

  347. }

  348. 

  349. static int vp6_adjust(int v, int t)

  350. {

  351.     int V = v, s = v >> 31;

  352.     V ^= s;

  353.     V -= s;

  354.     if (V-t-1 >= (unsigned)(t-1))

  355.         return v;

  356.     V = 2*t - V;

  357.     V += s;

  358.     V ^= s;

  359.     return V;

  360. }

  361. 

  362. static int vp6_block_variance(uint8_t *src, int stride)

  363. {

  364.     int sum = 0, square_sum = 0;

  365.     int y, x;

  366. 

  367.     for (y=0; y<8; y+=2) {

  368.         for (x=0; x<8; x+=2) {

  369.             sum += src[x];

  370.             square_sum += src[x]*src[x];

  371.         }

  372.         src += 2*stride;

  373.     }

  374.     return (16*square_sum - sum*sum) >> 8;

  375. }

  376. 

  377. static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,

  378.                            int delta, const int16_t *weights)

  379. {

  380.     int x, y;

  381. 

  382.     for (y=0; y<8; y++) {

  383.         for (x=0; x<8; x++) {

  384.             dst[x] = av_clip_uint8((  src[x-delta  ] * weights[0]

  385.                                  + src[x        ] * weights[1]

  386.                                  + src[x+delta  ] * weights[2]

  387.                                  + src[x+2*delta] * weights[3] + 64) >> 7);

  388.         }

  389.         src += stride;

  390.         dst += stride;

  391.     }

  392. }

  393. 

  394. static void vp6_filter_diag2(vp56_context_t *s, uint8_t *dst, uint8_t *src,

  395.                              int stride, int h_weight, int v_weight)

  396. {

  397.     uint8_t *tmp = s->edge_emu_buffer+16;

  398.     s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);

  399.     s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);

  400. }

  401. 

  402. static void vp6_filter_diag4(uint8_t *dst, uint8_t *src, int stride,

  403.                              const int16_t *h_weights,const int16_t *v_weights)

  404. {

  405.     int x, y;

  406.     int tmp[8*11];

  407.     int *t = tmp;

  408. 

  409.     src -= stride;

  410. 

  411.     for (y=0; y<11; y++) {

  412.         for (x=0; x<8; x++) {

  413.             t[x] = av_clip_uint8((  src[x-1] * h_weights[0]

  414.                                + src[x  ] * h_weights[1]

  415.                                + src[x+1] * h_weights[2]

  416.                                + src[x+2] * h_weights[3] + 64) >> 7);

  417.         }

  418.         src += stride;

  419.         t += 8;

  420.     }

  421. 

  422.     t = tmp + 8;

  423.     for (y=0; y<8; y++) {

  424.         for (x=0; x<8; x++) {

  425.             dst[x] = av_clip_uint8((  t[x-8 ] * v_weights[0]

  426.                                  + t[x   ] * v_weights[1]

  427.                                  + t[x+8 ] * v_weights[2]

  428.                                  + t[x+16] * v_weights[3] + 64) >> 7);

  429.         }

  430.         dst += stride;

  431.         t += 8;

  432.     }

  433. }

  434. 

  435. static void vp6_filter(vp56_context_t *s, uint8_t *dst, uint8_t *src,

  436.                        int offset1, int offset2, int stride,

  437.                        vp56_mv_t mv, int mask, int select, int luma)

  438. {

  439.     int filter4 = 0;

  440.     int x8 = mv.x & mask;

  441.     int y8 = mv.y & mask;

  442. 

  443.     if (luma) {

  444.         x8 *= 2;

  445.         y8 *= 2;

  446.         filter4 = s->filter_mode;

  447.         if (filter4 == 2) {

  448.             if (s->max_vector_length &&

  449.                 (FFABS(mv.x) > s->max_vector_length ||

  450.                  FFABS(mv.y) > s->max_vector_length)) {

  451.                 filter4 = 0;

  452.             } else if (s->sample_variance_threshold

  453.                        && (vp6_block_variance(src+offset1, stride)

  454.                            < s->sample_variance_threshold)) {

  455.                 filter4 = 0;

  456.             }

  457.         }

  458.     }

  459. 

  460.     if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {

  461.         offset1 = offset2;

  462.     }

  463. 

  464.     if (filter4) {

  465.         if (!y8) {                      /* left or right combine */

  466.             vp6_filter_hv4(dst, src+offset1, stride, 1,

  467.                            vp6_block_copy_filter[select][x8]);

  468.         } else if (!x8) {               /* above or below combine */

  469.             vp6_filter_hv4(dst, src+offset1, stride, stride,

  470.                            vp6_block_copy_filter[select][y8]);

  471.         } else {

  472.             vp6_filter_diag4(dst, src+offset1 + ((mv.x^mv.y)>>31), stride,

  473.                              vp6_block_copy_filter[select][x8],

  474.                              vp6_block_copy_filter[select][y8]);

  475.         }

  476.     } else {

  477.         if (!x8 || !y8) {

  478.             s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8);

  479.         } else {

  480.             vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);

  481.         }

  482.     }

  483. }

  484. 

  485. static int vp6_decode_init(AVCodecContext *avctx)

  486. {

  487.     vp56_context_t *s = avctx->priv_data;

  488. 

  489.     vp56_init(s, avctx, avctx->codec->id == CODEC_ID_VP6);

  490.     s->vp56_coord_div = vp6_coord_div;

  491.     s->parse_vector_adjustment = vp6_parse_vector_adjustment;

  492.     s->adjust = vp6_adjust;

  493.     s->filter = vp6_filter;

  494.     s->parse_coeff = vp6_parse_coeff;

  495.     s->default_models_init = vp6_default_models_init;

  496.     s->parse_vector_models = vp6_parse_vector_models;

  497.     s->parse_coeff_models = vp6_parse_coeff_models;

  498.     s->parse_header = vp6_parse_header;

  499. 

  500.     return 0;

  501. }

  502. 

  503. AVCodec vp6_decoder = {

  504.     "vp6",

  505.     CODEC_TYPE_VIDEO,

  506.     CODEC_ID_VP6,

  507.     sizeof(vp56_context_t),

  508.     vp6_decode_init,

  509.     NULL,

  510.     vp56_free,

  511.     vp56_decode_frame,

  512.     CODEC_CAP_DR1,

  513. };

  514. 

  515. /* flash version, not flipped upside-down */

  516. AVCodec vp6f_decoder = {

  517.     "vp6f",

  518.     CODEC_TYPE_VIDEO,

  519.     CODEC_ID_VP6F,

  520.     sizeof(vp56_context_t),

  521.     vp6_decode_init,

  522.     NULL,

  523.     vp56_free,

  524.     vp56_decode_frame,

  525.     CODEC_CAP_DR1,

  526. };