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FFmpeg/libavcodec/svq3.c

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  1. /*

  2.  * Copyright (c) 2003 The FFmpeg Project.

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. /*

  22.  * How to use this decoder:

  23.  * SVQ3 data is transported within Apple Quicktime files. Quicktime files

  24.  * have stsd atoms to describe media trak properties. A stsd atom for a

  25.  * video trak contains 1 or more ImageDescription atoms. These atoms begin

  26.  * with the 4-byte length of the atom followed by the codec fourcc. Some

  27.  * decoders need information in this atom to operate correctly. Such

  28.  * is the case with SVQ3. In order to get the best use out of this decoder,

  29.  * the calling app must make the SVQ3 ImageDescription atom available

  30.  * via the AVCodecContext's extradata[_size] field:

  31.  *

  32.  * AVCodecContext.extradata = pointer to ImageDescription, first characters

  33.  * are expected to be 'S', 'V', 'Q', and '3', NOT the 4-byte atom length

  34.  * AVCodecContext.extradata_size = size of ImageDescription atom memory

  35.  * buffer (which will be the same as the ImageDescription atom size field

  36.  * from the QT file, minus 4 bytes since the length is missing)

  37.  *

  38.  * You will know you have these parameters passed correctly when the decoder

  39.  * correctly decodes this file:

  40.  *  ftp://ftp.mplayerhq.hu/MPlayer/samples/V-codecs/SVQ3/Vertical400kbit.sorenson3.mov

  41.  */

  42. 

  43. #ifdef CONFIG_ZLIB

  44. #include <zlib.h>

  45. #endif

  46. 

  47. #include "svq1.h"

  48. 

  49. /**

  50.  * @file svq3.c

  51.  * svq3 decoder.

  52.  */

  53. 

  54. #define FULLPEL_MODE  1

  55. #define HALFPEL_MODE  2

  56. #define THIRDPEL_MODE 3

  57. #define PREDICT_MODE  4

  58. 

  59. /* dual scan (from some older h264 draft)

  60.  o-->o-->o   o

  61.          |  /|

  62.  o   o   o / o

  63.  | / |   |/  |

  64.  o   o   o   o

  65.    /

  66.  o-->o-->o-->o

  67. */

  68. static const uint8_t svq3_scan[16] = {

  69.     0+0*4, 1+0*4, 2+0*4, 2+1*4,

  70.     2+2*4, 3+0*4, 3+1*4, 3+2*4,

  71.     0+1*4, 0+2*4, 1+1*4, 1+2*4,

  72.     0+3*4, 1+3*4, 2+3*4, 3+3*4,

  73. };

  74. 

  75. static const uint8_t svq3_pred_0[25][2] = {

  76.     { 0, 0 },

  77.     { 1, 0 }, { 0, 1 },

  78.     { 0, 2 }, { 1, 1 }, { 2, 0 },

  79.     { 3, 0 }, { 2, 1 }, { 1, 2 }, { 0, 3 },

  80.     { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

  81.     { 4, 1 }, { 3, 2 }, { 2, 3 }, { 1, 4 },

  82.     { 2, 4 }, { 3, 3 }, { 4, 2 },

  83.     { 4, 3 }, { 3, 4 },

  84.     { 4, 4 }

  85. };

  86. 

  87. static const int8_t svq3_pred_1[6][6][5] = {

  88.     { { 2,-1,-1,-1,-1 }, { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 },

  89.       { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 }, { 1, 2,-1,-1,-1 } },

  90.     { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 4, 3 }, { 0, 1, 2, 4, 3 },

  91.       { 0, 2, 1, 4, 3 }, { 2, 0, 1, 3, 4 }, { 0, 4, 2, 1, 3 } },

  92.     { { 2, 0,-1,-1,-1 }, { 2, 1, 0, 4, 3 }, { 1, 2, 4, 0, 3 },

  93.       { 2, 1, 0, 4, 3 }, { 2, 1, 4, 3, 0 }, { 1, 2, 4, 0, 3 } },

  94.     { { 2, 0,-1,-1,-1 }, { 2, 0, 1, 4, 3 }, { 1, 2, 0, 4, 3 },

  95.       { 2, 1, 0, 4, 3 }, { 2, 1, 3, 4, 0 }, { 2, 4, 1, 0, 3 } },

  96.     { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 3, 4 }, { 1, 2, 3, 0, 4 },

  97.       { 2, 0, 1, 3, 4 }, { 2, 1, 3, 0, 4 }, { 2, 0, 4, 3, 1 } },

  98.     { { 0, 2,-1,-1,-1 }, { 0, 2, 4, 1, 3 }, { 1, 4, 2, 0, 3 },

  99.       { 4, 2, 0, 1, 3 }, { 2, 0, 1, 4, 3 }, { 4, 2, 1, 0, 3 } },

  100. };

  101. 

  102. static const struct { uint8_t run; uint8_t level; } svq3_dct_tables[2][16] = {

  103.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  104.       { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  105.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  106.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  107. };

  108. 

  109. static const uint32_t svq3_dequant_coeff[32] = {

  110.      3881,  4351,  4890,  5481,  6154,  6914,  7761,  8718,

  111.      9781, 10987, 12339, 13828, 15523, 17435, 19561, 21873,

  112.     24552, 27656, 30847, 34870, 38807, 43747, 49103, 54683,

  113.     61694, 68745, 77615, 89113,100253,109366,126635,141533

  114. };

  115. 

  116. 

  117. static void svq3_luma_dc_dequant_idct_c(DCTELEM *block, int qp)

  118. {

  119.     const int qmul = svq3_dequant_coeff[qp];

  120. #define stride 16

  121.     int i;

  122.     int temp[16];

  123.     static const int x_offset[4] = {0, 1*stride, 4* stride,  5*stride};

  124.     static const int y_offset[4] = {0, 2*stride, 8* stride, 10*stride};

  125. 

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

  127.         const int offset = y_offset[i];

  128.         const int z0 = 13*(block[offset+stride*0] +    block[offset+stride*4]);

  129.         const int z1 = 13*(block[offset+stride*0] -    block[offset+stride*4]);

  130.         const int z2 =  7* block[offset+stride*1] - 17*block[offset+stride*5];

  131.         const int z3 = 17* block[offset+stride*1] +  7*block[offset+stride*5];

  132. 

  133.         temp[4*i+0] = z0+z3;

  134.         temp[4*i+1] = z1+z2;

  135.         temp[4*i+2] = z1-z2;

  136.         temp[4*i+3] = z0-z3;

  137.     }

  138. 

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

  140.         const int offset = x_offset[i];

  141.         const int z0 = 13*(temp[4*0+i] +    temp[4*2+i]);

  142.         const int z1 = 13*(temp[4*0+i] -    temp[4*2+i]);

  143.         const int z2 =  7* temp[4*1+i] - 17*temp[4*3+i];

  144.         const int z3 = 17* temp[4*1+i] +  7*temp[4*3+i];

  145. 

  146.         block[stride*0 +offset] = ((z0 + z3)*qmul + 0x80000) >> 20;

  147.         block[stride*2 +offset] = ((z1 + z2)*qmul + 0x80000) >> 20;

  148.         block[stride*8 +offset] = ((z1 - z2)*qmul + 0x80000) >> 20;

  149.         block[stride*10+offset] = ((z0 - z3)*qmul + 0x80000) >> 20;

  150.     }

  151. }

  152. #undef stride

  153. 

  154. static void svq3_add_idct_c(uint8_t *dst, DCTELEM *block, int stride, int qp,

  155.                             int dc)

  156. {

  157.     const int qmul = svq3_dequant_coeff[qp];

  158.     int i;

  159.     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

  160. 

  161.     if (dc) {

  162.         dc = 13*13*((dc == 1) ? 1538*block[0] : ((qmul*(block[0] >> 3)) / 2));

  163.         block[0] = 0;

  164.     }

  165. 

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

  167.         const int z0 = 13*(block[0 + 4*i] +    block[2 + 4*i]);

  168.         const int z1 = 13*(block[0 + 4*i] -    block[2 + 4*i]);

  169.         const int z2 =  7* block[1 + 4*i] - 17*block[3 + 4*i];

  170.         const int z3 = 17* block[1 + 4*i] +  7*block[3 + 4*i];

  171. 

  172.         block[0 + 4*i] = z0 + z3;

  173.         block[1 + 4*i] = z1 + z2;

  174.         block[2 + 4*i] = z1 - z2;

  175.         block[3 + 4*i] = z0 - z3;

  176.     }

  177. 

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

  179.         const int z0 = 13*(block[i + 4*0] +    block[i + 4*2]);

  180.         const int z1 = 13*(block[i + 4*0] -    block[i + 4*2]);

  181.         const int z2 =  7* block[i + 4*1] - 17*block[i + 4*3];

  182.         const int z3 = 17* block[i + 4*1] +  7*block[i + 4*3];

  183.         const int rr = (dc + 0x80000);

  184. 

  185.         dst[i + stride*0] = cm[ dst[i + stride*0] + (((z0 + z3)*qmul + rr) >> 20) ];

  186.         dst[i + stride*1] = cm[ dst[i + stride*1] + (((z1 + z2)*qmul + rr) >> 20) ];

  187.         dst[i + stride*2] = cm[ dst[i + stride*2] + (((z1 - z2)*qmul + rr) >> 20) ];

  188.         dst[i + stride*3] = cm[ dst[i + stride*3] + (((z0 - z3)*qmul + rr) >> 20) ];

  189.     }

  190. }

  191. 

  192. static inline int svq3_decode_block(GetBitContext *gb, DCTELEM *block,

  193.                                     int index, const int type)

  194. {

  195.     static const uint8_t *const scan_patterns[4] =

  196.     { luma_dc_zigzag_scan, zigzag_scan, svq3_scan, chroma_dc_scan };

  197. 

  198.     int run, level, sign, vlc, limit;

  199.     const int intra = (3 * type) >> 2;

  200.     const uint8_t *const scan = scan_patterns[type];

  201. 

  202.     for (limit = (16 >> intra); index < 16; index = limit, limit += 8) {

  203.         for (; (vlc = svq3_get_ue_golomb(gb)) != 0; index++) {

  204. 

  205.           if (vlc == INVALID_VLC)

  206.               return -1;

  207. 

  208.           sign = (vlc & 0x1) - 1;

  209.           vlc  = (vlc + 1) >> 1;

  210. 

  211.           if (type == 3) {

  212.               if (vlc < 3) {

  213.                   run   = 0;

  214.                   level = vlc;

  215.               } else if (vlc < 4) {

  216.                   run   = 1;

  217.                   level = 1;

  218.               } else {

  219.                   run   = (vlc & 0x3);

  220.                   level = ((vlc + 9) >> 2) - run;

  221.               }

  222.           } else {

  223.               if (vlc < 16) {

  224.                   run   = svq3_dct_tables[intra][vlc].run;

  225.                   level = svq3_dct_tables[intra][vlc].level;

  226.               } else if (intra) {

  227.                   run   = (vlc & 0x7);

  228.                   level = (vlc >> 3) + ((run == 0) ? 8 : ((run < 2) ? 2 : ((run < 5) ? 0 : -1)));

  229.               } else {

  230.                   run   = (vlc & 0xF);

  231.                   level = (vlc >> 4) + ((run == 0) ? 4 : ((run < 3) ? 2 : ((run < 10) ? 1 : 0)));

  232.               }

  233.           }

  234. 

  235.           if ((index += run) >= limit)

  236.               return -1;

  237. 

  238.           block[scan[index]] = (level ^ sign) - sign;

  239.         }

  240. 

  241.         if (type != 2) {

  242.             break;

  243.         }

  244.     }

  245. 

  246.     return 0;

  247. }

  248. 

  249. static inline void svq3_mc_dir_part(MpegEncContext *s,

  250.                                     int x, int y, int width, int height,

  251.                                     int mx, int my, int dxy,

  252.                                     int thirdpel, int dir, int avg)

  253. {

  254.     const Picture *pic = (dir == 0) ? &s->last_picture : &s->next_picture;

  255.     uint8_t *src, *dest;

  256.     int i, emu = 0;

  257.     int blocksize = 2 - (width>>3); //16->0, 8->1, 4->2

  258. 

  259.     mx += x;

  260.     my += y;

  261. 

  262.     if (mx < 0 || mx >= (s->h_edge_pos - width  - 1) ||

  263.         my < 0 || my >= (s->v_edge_pos - height - 1)) {

  264. 

  265.         if ((s->flags & CODEC_FLAG_EMU_EDGE)) {

  266.             emu = 1;

  267.         }

  268. 

  269.         mx = av_clip (mx, -16, (s->h_edge_pos - width  + 15));

  270.         my = av_clip (my, -16, (s->v_edge_pos - height + 15));

  271.     }

  272. 

  273.     /* form component predictions */

  274.     dest = s->current_picture.data[0] + x + y*s->linesize;

  275.     src  = pic->data[0] + mx + my*s->linesize;

  276. 

  277.     if (emu) {

  278.         ff_emulated_edge_mc(s->edge_emu_buffer, src, s->linesize, (width + 1), (height + 1),

  279.                             mx, my, s->h_edge_pos, s->v_edge_pos);

  280.         src = s->edge_emu_buffer;

  281.     }

  282.     if (thirdpel)

  283.         (avg ? s->dsp.avg_tpel_pixels_tab : s->dsp.put_tpel_pixels_tab)[dxy](dest, src, s->linesize, width, height);

  284.     else

  285.         (avg ? s->dsp.avg_pixels_tab : s->dsp.put_pixels_tab)[blocksize][dxy](dest, src, s->linesize, height);

  286. 

  287.     if (!(s->flags & CODEC_FLAG_GRAY)) {

  288.         mx     = (mx + (mx < (int) x)) >> 1;

  289.         my     = (my + (my < (int) y)) >> 1;

  290.         width  = (width  >> 1);

  291.         height = (height >> 1);

  292.         blocksize++;

  293. 

  294.         for (i = 1; i < 3; i++) {

  295.             dest = s->current_picture.data[i] + (x >> 1) + (y >> 1)*s->uvlinesize;

  296.             src  = pic->data[i] + mx + my*s->uvlinesize;

  297. 

  298.             if (emu) {

  299.                 ff_emulated_edge_mc(s->edge_emu_buffer, src, s->uvlinesize, (width + 1), (height + 1),

  300.                                     mx, my, (s->h_edge_pos >> 1), (s->v_edge_pos >> 1));

  301.                 src = s->edge_emu_buffer;

  302.             }

  303.             if (thirdpel)

  304.                 (avg ? s->dsp.avg_tpel_pixels_tab : s->dsp.put_tpel_pixels_tab)[dxy](dest, src, s->uvlinesize, width, height);

  305.             else

  306.                 (avg ? s->dsp.avg_pixels_tab : s->dsp.put_pixels_tab)[blocksize][dxy](dest, src, s->uvlinesize, height);

  307.         }

  308.     }

  309. }

  310. 

  311. static inline int svq3_mc_dir(H264Context *h, int size, int mode, int dir,

  312.                               int avg)

  313. {

  314.     int i, j, k, mx, my, dx, dy, x, y;

  315.     MpegEncContext *const s = (MpegEncContext *) h;

  316.     const int part_width  = ((size & 5) == 4) ? 4 : 16 >> (size & 1);

  317.     const int part_height = 16 >> ((unsigned) (size + 1) / 3);

  318.     const int extra_width = (mode == PREDICT_MODE) ? -16*6 : 0;

  319.     const int h_edge_pos  = 6*(s->h_edge_pos - part_width ) - extra_width;

  320.     const int v_edge_pos  = 6*(s->v_edge_pos - part_height) - extra_width;

  321. 

  322.     for (i = 0; i < 16; i += part_height) {

  323.         for (j = 0; j < 16; j += part_width) {

  324.             const int b_xy = (4*s->mb_x + (j >> 2)) + (4*s->mb_y + (i >> 2))*h->b_stride;

  325.             int dxy;

  326.             x = 16*s->mb_x + j;

  327.             y = 16*s->mb_y + i;

  328.             k = ((j >> 2) & 1) + ((i >> 1) & 2) + ((j >> 1) & 4) + (i & 8);

  329. 

  330.             if (mode != PREDICT_MODE) {

  331.                 pred_motion(h, k, (part_width >> 2), dir, 1, &mx, &my);

  332.             } else {

  333.                 mx = s->next_picture.motion_val[0][b_xy][0]<<1;

  334.                 my = s->next_picture.motion_val[0][b_xy][1]<<1;

  335. 

  336.                 if (dir == 0) {

  337.                     mx = ((mx * h->frame_num_offset) / h->prev_frame_num_offset + 1) >> 1;

  338.                     my = ((my * h->frame_num_offset) / h->prev_frame_num_offset + 1) >> 1;

  339.                 } else {

  340.                     mx = ((mx * (h->frame_num_offset - h->prev_frame_num_offset)) / h->prev_frame_num_offset + 1) >> 1;

  341.                     my = ((my * (h->frame_num_offset - h->prev_frame_num_offset)) / h->prev_frame_num_offset + 1) >> 1;

  342.                 }

  343.             }

  344. 

  345.             /* clip motion vector prediction to frame border */

  346.             mx = av_clip(mx, extra_width - 6*x, h_edge_pos - 6*x);

  347.             my = av_clip(my, extra_width - 6*y, v_edge_pos - 6*y);

  348. 

  349.             /* get (optional) motion vector differential */

  350.             if (mode == PREDICT_MODE) {

  351.                 dx = dy = 0;

  352.             } else {

  353.                 dy = svq3_get_se_golomb(&s->gb);

  354.                 dx = svq3_get_se_golomb(&s->gb);

  355. 

  356.                 if (dx == INVALID_VLC || dy == INVALID_VLC) {

  357.                     av_log(h->s.avctx, AV_LOG_ERROR, "invalid MV vlc\n");

  358.                     return -1;

  359.                 }

  360.             }

  361. 

  362.             /* compute motion vector */

  363.             if (mode == THIRDPEL_MODE) {

  364.                 int fx, fy;

  365.                 mx  = ((mx + 1)>>1) + dx;

  366.                 my  = ((my + 1)>>1) + dy;

  367.                 fx  = ((unsigned)(mx + 0x3000))/3 - 0x1000;

  368.                 fy  = ((unsigned)(my + 0x3000))/3 - 0x1000;

  369.                 dxy = (mx - 3*fx) + 4*(my - 3*fy);

  370. 

  371.                 svq3_mc_dir_part(s, x, y, part_width, part_height, fx, fy, dxy, 1, dir, avg);

  372.                 mx += mx;

  373.                 my += my;

  374.             } else if (mode == HALFPEL_MODE || mode == PREDICT_MODE) {

  375.                 mx  = ((unsigned)(mx + 1 + 0x3000))/3 + dx - 0x1000;

  376.                 my  = ((unsigned)(my + 1 + 0x3000))/3 + dy - 0x1000;

  377.                 dxy = (mx&1) + 2*(my&1);

  378. 

  379.                 svq3_mc_dir_part(s, x, y, part_width, part_height, mx>>1, my>>1, dxy, 0, dir, avg);

  380.                 mx *= 3;

  381.                 my *= 3;

  382.             } else {

  383.                 mx = ((unsigned)(mx + 3 + 0x6000))/6 + dx - 0x1000;

  384.                 my = ((unsigned)(my + 3 + 0x6000))/6 + dy - 0x1000;

  385. 

  386.                 svq3_mc_dir_part(s, x, y, part_width, part_height, mx, my, 0, 0, dir, avg);

  387.                 mx *= 6;

  388.                 my *= 6;

  389.             }

  390. 

  391.             /* update mv_cache */

  392.             if (mode != PREDICT_MODE) {

  393.                 int32_t mv = pack16to32(mx,my);

  394. 

  395.                 if (part_height == 8 && i < 8) {

  396.                     *(int32_t *) h->mv_cache[dir][scan8[k] + 1*8] = mv;

  397. 

  398.                     if (part_width == 8 && j < 8) {

  399.                         *(int32_t *) h->mv_cache[dir][scan8[k] + 1 + 1*8] = mv;

  400.                     }

  401.                 }

  402.                 if (part_width == 8 && j < 8) {

  403.                     *(int32_t *) h->mv_cache[dir][scan8[k] + 1] = mv;

  404.                 }

  405.                 if (part_width == 4 || part_height == 4) {

  406.                     *(int32_t *) h->mv_cache[dir][scan8[k]] = mv;

  407.                 }

  408.             }

  409. 

  410.             /* write back motion vectors */

  411.             fill_rectangle(s->current_picture.motion_val[dir][b_xy], part_width>>2, part_height>>2, h->b_stride, pack16to32(mx,my), 4);

  412.         }

  413.     }

  414. 

  415.     return 0;

  416. }

  417. 

  418. static int svq3_decode_mb(H264Context *h, unsigned int mb_type)

  419. {

  420.     int i, j, k, m, dir, mode;

  421.     int cbp = 0;

  422.     uint32_t vlc;

  423.     int8_t *top, *left;

  424.     MpegEncContext *const s = (MpegEncContext *) h;

  425.     const int mb_xy = h->mb_xy;

  426.     const int b_xy  = 4*s->mb_x + 4*s->mb_y*h->b_stride;

  427. 

  428.     h->top_samples_available      = (s->mb_y == 0) ? 0x33FF : 0xFFFF;

  429.     h->left_samples_available     = (s->mb_x == 0) ? 0x5F5F : 0xFFFF;

  430.     h->topright_samples_available = 0xFFFF;

  431. 

  432.     if (mb_type == 0) {           /* SKIP */

  433.         if (s->pict_type == FF_P_TYPE || s->next_picture.mb_type[mb_xy] == -1) {

  434.             svq3_mc_dir_part(s, 16*s->mb_x, 16*s->mb_y, 16, 16, 0, 0, 0, 0, 0, 0);

  435. 

  436.             if (s->pict_type == FF_B_TYPE) {

  437.                 svq3_mc_dir_part(s, 16*s->mb_x, 16*s->mb_y, 16, 16, 0, 0, 0, 0, 1, 1);

  438.             }

  439. 

  440.             mb_type = MB_TYPE_SKIP;

  441.         } else {

  442.             mb_type = FFMIN(s->next_picture.mb_type[mb_xy], 6);

  443.             if (svq3_mc_dir(h, mb_type, PREDICT_MODE, 0, 0) < 0)

  444.                 return -1;

  445.             if (svq3_mc_dir(h, mb_type, PREDICT_MODE, 1, 1) < 0)

  446.                 return -1;

  447. 

  448.             mb_type = MB_TYPE_16x16;

  449.         }

  450.     } else if (mb_type < 8) {     /* INTER */

  451.         if (h->thirdpel_flag && h->halfpel_flag == !get_bits1 (&s->gb)) {

  452.             mode = THIRDPEL_MODE;

  453.         } else if (h->halfpel_flag && h->thirdpel_flag == !get_bits1 (&s->gb)) {

  454.             mode = HALFPEL_MODE;

  455.         } else {

  456.             mode = FULLPEL_MODE;

  457.         }

  458. 

  459.         /* fill caches */

  460.         /* note ref_cache should contain here:

  461.             ????????

  462.             ???11111

  463.             N??11111

  464.             N??11111

  465.             N??11111

  466.         */

  467. 

  468.         for (m = 0; m < 2; m++) {

  469.             if (s->mb_x > 0 && h->intra4x4_pred_mode[mb_xy - 1][0] != -1) {

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

  471.                     *(uint32_t *) h->mv_cache[m][scan8[0] - 1 + i*8] = *(uint32_t *) s->current_picture.motion_val[m][b_xy - 1 + i*h->b_stride];

  472.                 }

  473.             } else {

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

  475.                     *(uint32_t *) h->mv_cache[m][scan8[0] - 1 + i*8] = 0;

  476.                 }

  477.             }

  478.             if (s->mb_y > 0) {

  479.                 memcpy(h->mv_cache[m][scan8[0] - 1*8], s->current_picture.motion_val[m][b_xy - h->b_stride], 4*2*sizeof(int16_t));

  480.                 memset(&h->ref_cache[m][scan8[0] - 1*8], (h->intra4x4_pred_mode[mb_xy - s->mb_stride][4] == -1) ? PART_NOT_AVAILABLE : 1, 4);

  481. 

  482.                 if (s->mb_x < (s->mb_width - 1)) {

  483.                     *(uint32_t *) h->mv_cache[m][scan8[0] + 4 - 1*8] = *(uint32_t *) s->current_picture.motion_val[m][b_xy - h->b_stride + 4];

  484.                     h->ref_cache[m][scan8[0] + 4 - 1*8] =

  485.                         (h->intra4x4_pred_mode[mb_xy - s->mb_stride + 1][0] == -1 ||

  486.                          h->intra4x4_pred_mode[mb_xy - s->mb_stride    ][4] == -1) ? PART_NOT_AVAILABLE : 1;

  487.                 }else

  488.                     h->ref_cache[m][scan8[0] + 4 - 1*8] = PART_NOT_AVAILABLE;

  489.                 if (s->mb_x > 0) {

  490.                     *(uint32_t *) h->mv_cache[m][scan8[0] - 1 - 1*8] = *(uint32_t *) s->current_picture.motion_val[m][b_xy - h->b_stride - 1];

  491.                     h->ref_cache[m][scan8[0] - 1 - 1*8] = (h->intra4x4_pred_mode[mb_xy - s->mb_stride - 1][3] == -1) ? PART_NOT_AVAILABLE : 1;

  492.                 }else

  493.                     h->ref_cache[m][scan8[0] - 1 - 1*8] = PART_NOT_AVAILABLE;

  494.             }else

  495.                 memset(&h->ref_cache[m][scan8[0] - 1*8 - 1], PART_NOT_AVAILABLE, 8);

  496. 

  497.             if (s->pict_type != FF_B_TYPE)

  498.                 break;

  499.         }

  500. 

  501.         /* decode motion vector(s) and form prediction(s) */

  502.         if (s->pict_type == FF_P_TYPE) {

  503.             if (svq3_mc_dir(h, (mb_type - 1), mode, 0, 0) < 0)

  504.                 return -1;

  505.         } else {        /* FF_B_TYPE */

  506.             if (mb_type != 2) {

  507.                 if (svq3_mc_dir(h, 0, mode, 0, 0) < 0)

  508.                     return -1;

  509.             } else {

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

  511.                     memset(s->current_picture.motion_val[0][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));

  512.                 }

  513.             }

  514.             if (mb_type != 1) {

  515.                 if (svq3_mc_dir(h, 0, mode, 1, (mb_type == 3)) < 0)

  516.                     return -1;

  517.             } else {

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

  519.                     memset(s->current_picture.motion_val[1][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));

  520.                 }

  521.             }

  522.         }

  523. 

  524.         mb_type = MB_TYPE_16x16;

  525.     } else if (mb_type == 8 || mb_type == 33) {   /* INTRA4x4 */

  526.         memset(h->intra4x4_pred_mode_cache, -1, 8*5*sizeof(int8_t));

  527. 

  528.         if (mb_type == 8) {

  529.             if (s->mb_x > 0) {

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

  531.                     h->intra4x4_pred_mode_cache[scan8[0] - 1 + i*8] = h->intra4x4_pred_mode[mb_xy - 1][i];

  532.                 }

  533.                 if (h->intra4x4_pred_mode_cache[scan8[0] - 1] == -1) {

  534.                     h->left_samples_available = 0x5F5F;

  535.                 }

  536.             }

  537.             if (s->mb_y > 0) {

  538.                 h->intra4x4_pred_mode_cache[4+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][4];

  539.                 h->intra4x4_pred_mode_cache[5+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][5];

  540.                 h->intra4x4_pred_mode_cache[6+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][6];

  541.                 h->intra4x4_pred_mode_cache[7+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][3];

  542. 

  543.                 if (h->intra4x4_pred_mode_cache[4+8*0] == -1) {

  544.                     h->top_samples_available = 0x33FF;

  545.                 }

  546.             }

  547. 

  548.             /* decode prediction codes for luma blocks */

  549.             for (i = 0; i < 16; i+=2) {

  550.                 vlc = svq3_get_ue_golomb(&s->gb);

  551. 

  552.                 if (vlc >= 25){

  553.                     av_log(h->s.avctx, AV_LOG_ERROR, "luma prediction:%d\n", vlc);

  554.                     return -1;

  555.                 }

  556. 

  557.                 left    = &h->intra4x4_pred_mode_cache[scan8[i] - 1];

  558.                 top     = &h->intra4x4_pred_mode_cache[scan8[i] - 8];

  559. 

  560.                 left[1] = svq3_pred_1[top[0] + 1][left[0] + 1][svq3_pred_0[vlc][0]];

  561.                 left[2] = svq3_pred_1[top[1] + 1][left[1] + 1][svq3_pred_0[vlc][1]];

  562. 

  563.                 if (left[1] == -1 || left[2] == -1){

  564.                     av_log(h->s.avctx, AV_LOG_ERROR, "weird prediction\n");

  565.                     return -1;

  566.                 }

  567.             }

  568.         } else {    /* mb_type == 33, DC_128_PRED block type */

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

  570.                 memset(&h->intra4x4_pred_mode_cache[scan8[0] + 8*i], DC_PRED, 4);

  571.             }

  572.         }

  573. 

  574.         write_back_intra_pred_mode(h);

  575. 

  576.         if (mb_type == 8) {

  577.             check_intra4x4_pred_mode(h);

  578. 

  579.             h->top_samples_available  = (s->mb_y == 0) ? 0x33FF : 0xFFFF;

  580.             h->left_samples_available = (s->mb_x == 0) ? 0x5F5F : 0xFFFF;

  581.         } else {

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

  583.                 memset(&h->intra4x4_pred_mode_cache[scan8[0] + 8*i], DC_128_PRED, 4);

  584.             }

  585. 

  586.             h->top_samples_available  = 0x33FF;

  587.             h->left_samples_available = 0x5F5F;

  588.         }

  589. 

  590.         mb_type = MB_TYPE_INTRA4x4;

  591.     } else {                      /* INTRA16x16 */

  592.         dir = i_mb_type_info[mb_type - 8].pred_mode;

  593.         dir = (dir >> 1) ^ 3*(dir & 1) ^ 1;

  594. 

  595.         if ((h->intra16x16_pred_mode = check_intra_pred_mode(h, dir)) == -1){

  596.             av_log(h->s.avctx, AV_LOG_ERROR, "check_intra_pred_mode = -1\n");

  597.             return -1;

  598.         }

  599. 

  600.         cbp = i_mb_type_info[mb_type - 8].cbp;

  601.         mb_type = MB_TYPE_INTRA16x16;

  602.     }

  603. 

  604.     if (!IS_INTER(mb_type) && s->pict_type != FF_I_TYPE) {

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

  606.             memset(s->current_picture.motion_val[0][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));

  607.         }

  608.         if (s->pict_type == FF_B_TYPE) {

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

  610.                 memset(s->current_picture.motion_val[1][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));

  611.             }

  612.         }

  613.     }

  614.     if (!IS_INTRA4x4(mb_type)) {

  615.         memset(h->intra4x4_pred_mode[mb_xy], DC_PRED, 8);

  616.     }

  617.     if (!IS_SKIP(mb_type) || s->pict_type == FF_B_TYPE) {

  618.         memset(h->non_zero_count_cache + 8, 0, 4*9*sizeof(uint8_t));

  619.         s->dsp.clear_blocks(h->mb);

  620.     }

  621. 

  622.     if (!IS_INTRA16x16(mb_type) && (!IS_SKIP(mb_type) || s->pict_type == FF_B_TYPE)) {

  623.         if ((vlc = svq3_get_ue_golomb(&s->gb)) >= 48){

  624.             av_log(h->s.avctx, AV_LOG_ERROR, "cbp_vlc=%d\n", vlc);

  625.             return -1;

  626.         }

  627. 

  628.         cbp = IS_INTRA(mb_type) ? golomb_to_intra4x4_cbp[vlc] : golomb_to_inter_cbp[vlc];

  629.     }

  630.     if (IS_INTRA16x16(mb_type) || (s->pict_type != FF_I_TYPE && s->adaptive_quant && cbp)) {

  631.         s->qscale += svq3_get_se_golomb(&s->gb);

  632. 

  633.         if (s->qscale > 31){

  634.             av_log(h->s.avctx, AV_LOG_ERROR, "qscale:%d\n", s->qscale);

  635.             return -1;

  636.         }

  637.     }

  638.     if (IS_INTRA16x16(mb_type)) {

  639.         if (svq3_decode_block(&s->gb, h->mb, 0, 0)){

  640.             av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding intra luma dc\n");

  641.             return -1;

  642.         }

  643.     }

  644. 

  645.     if (cbp) {

  646.         const int index = IS_INTRA16x16(mb_type) ? 1 : 0;

  647.         const int type = ((s->qscale < 24 && IS_INTRA4x4(mb_type)) ? 2 : 1);

  648. 

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

  650.             if ((cbp & (1 << i))) {

  651.                 for (j = 0; j < 4; j++) {

  652.                     k = index ? ((j&1) + 2*(i&1) + 2*(j&2) + 4*(i&2)) : (4*i + j);

  653.                     h->non_zero_count_cache[ scan8[k] ] = 1;

  654. 

  655.                     if (svq3_decode_block(&s->gb, &h->mb[16*k], index, type)){

  656.                         av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding block\n");

  657.                         return -1;

  658.                     }

  659.                 }

  660.             }

  661.         }

  662. 

  663.         if ((cbp & 0x30)) {

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

  665.               if (svq3_decode_block(&s->gb, &h->mb[16*(16 + 4*i)], 0, 3)){

  666.                 av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding chroma dc block\n");

  667.                 return -1;

  668.               }

  669.             }

  670. 

  671.             if ((cbp & 0x20)) {

  672.                 for (i = 0; i < 8; i++) {

  673.                     h->non_zero_count_cache[ scan8[16+i] ] = 1;

  674. 

  675.                     if (svq3_decode_block(&s->gb, &h->mb[16*(16 + i)], 1, 1)){

  676.                         av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding chroma ac block\n");

  677.                         return -1;

  678.                     }

  679.                 }

  680.             }

  681.         }

  682.     }

  683. 

  684.     h->cbp= cbp;

  685.     s->current_picture.mb_type[mb_xy] = mb_type;

  686. 

  687.     if (IS_INTRA(mb_type)) {

  688.         h->chroma_pred_mode = check_intra_pred_mode(h, DC_PRED8x8);

  689.     }

  690. 

  691.     return 0;

  692. }

  693. 

  694. static int svq3_decode_slice_header(H264Context *h)

  695. {

  696.     MpegEncContext *const s = (MpegEncContext *) h;

  697.     const int mb_xy = h->mb_xy;

  698.     int i, header;

  699. 

  700.     header = get_bits(&s->gb, 8);

  701. 

  702.     if (((header & 0x9F) != 1 && (header & 0x9F) != 2) || (header & 0x60) == 0) {

  703.         /* TODO: what? */

  704.         av_log(h->s.avctx, AV_LOG_ERROR, "unsupported slice header (%02X)\n", header);

  705.         return -1;

  706.     } else {

  707.         int length = (header >> 5) & 3;

  708. 

  709.         h->next_slice_index = get_bits_count(&s->gb) + 8*show_bits(&s->gb, 8*length) + 8*length;

  710. 

  711.         if (h->next_slice_index > s->gb.size_in_bits) {

  712.             av_log(h->s.avctx, AV_LOG_ERROR, "slice after bitstream end\n");

  713.             return -1;

  714.     }

  715. 

  716.         s->gb.size_in_bits = h->next_slice_index - 8*(length - 1);

  717.         skip_bits(&s->gb, 8);

  718. 

  719.         if (h->svq3_watermark_key) {

  720.             uint32_t header = AV_RL32(&s->gb.buffer[(get_bits_count(&s->gb)>>3)+1]);

  721.             AV_WL32(&s->gb.buffer[(get_bits_count(&s->gb)>>3)+1], header ^ h->svq3_watermark_key);

  722.         }

  723.         if (length > 0) {

  724.             memcpy((uint8_t *) &s->gb.buffer[get_bits_count(&s->gb) >> 3],

  725.                    &s->gb.buffer[s->gb.size_in_bits >> 3], (length - 1));

  726.         }

  727.     }

  728. 

  729.     if ((i = svq3_get_ue_golomb(&s->gb)) == INVALID_VLC || i >= 3){

  730.         av_log(h->s.avctx, AV_LOG_ERROR, "illegal slice type %d \n", i);

  731.         return -1;

  732.     }

  733. 

  734.     h->slice_type = golomb_to_pict_type[i];

  735. 

  736.     if ((header & 0x9F) == 2) {

  737.         i = (s->mb_num < 64) ? 6 : (1 + av_log2 (s->mb_num - 1));

  738.         s->mb_skip_run = get_bits(&s->gb, i) - (s->mb_x + (s->mb_y * s->mb_width));

  739.     } else {

  740.         skip_bits1(&s->gb);

  741.         s->mb_skip_run = 0;

  742.     }

  743. 

  744.     h->slice_num = get_bits(&s->gb, 8);

  745.     s->qscale = get_bits(&s->gb, 5);

  746.     s->adaptive_quant = get_bits1(&s->gb);

  747. 

  748.     /* unknown fields */

  749.     skip_bits1(&s->gb);

  750. 

  751.     if (h->unknown_svq3_flag) {

  752.         skip_bits1(&s->gb);

  753.     }

  754. 

  755.     skip_bits1(&s->gb);

  756.     skip_bits(&s->gb, 2);

  757. 

  758.     while (get_bits1(&s->gb)) {

  759.         skip_bits(&s->gb, 8);

  760.     }

  761. 

  762.     /* reset intra predictors and invalidate motion vector references */

  763.     if (s->mb_x > 0) {

  764.         memset(h->intra4x4_pred_mode[mb_xy - 1], -1, 4*sizeof(int8_t));

  765.         memset(h->intra4x4_pred_mode[mb_xy - s->mb_x], -1, 8*sizeof(int8_t)*s->mb_x);

  766.     }

  767.     if (s->mb_y > 0) {

  768.         memset(h->intra4x4_pred_mode[mb_xy - s->mb_stride], -1, 8*sizeof(int8_t)*(s->mb_width - s->mb_x));

  769. 

  770.         if (s->mb_x > 0) {

  771.             h->intra4x4_pred_mode[mb_xy - s->mb_stride - 1][3] = -1;

  772.         }

  773.     }

  774. 

  775.     return 0;

  776. }

  777. 

  778. static int svq3_decode_init(AVCodecContext *avctx)

  779. {

  780.     MpegEncContext *const s = avctx->priv_data;

  781.     H264Context *const h = avctx->priv_data;

  782.     int m;

  783.     unsigned char *extradata;

  784.     unsigned int size;

  785. 

  786.     if (decode_init(avctx) < 0)

  787.         return -1;

  788. 

  789.     s->flags  = avctx->flags;

  790.     s->flags2 = avctx->flags2;

  791.     s->unrestricted_mv = 1;

  792.     h->is_complex=1;

  793. 

  794.     if (!s->context_initialized) {

  795.         s->width  = avctx->width;

  796.         s->height = avctx->height;

  797.         h->halfpel_flag      = 1;

  798.         h->thirdpel_flag     = 1;

  799.         h->unknown_svq3_flag = 0;

  800.         h->chroma_qp[0]      = h->chroma_qp[1] = 4;

  801. 

  802.         if (MPV_common_init(s) < 0)

  803.             return -1;

  804. 

  805.         h->b_stride = 4*s->mb_width;

  806. 

  807.         alloc_tables(h);

  808. 

  809.         /* prowl for the "SEQH" marker in the extradata */

  810.         extradata = (unsigned char *)avctx->extradata;

  811.         for (m = 0; m < avctx->extradata_size; m++) {

  812.             if (!memcmp(extradata, "SEQH", 4))

  813.                 break;

  814.             extradata++;

  815.         }

  816. 

  817.         /* if a match was found, parse the extra data */

  818.         if (extradata && !memcmp(extradata, "SEQH", 4)) {

  819. 

  820.             GetBitContext gb;

  821. 

  822.             size = AV_RB32(&extradata[4]);

  823.             init_get_bits(&gb, extradata + 8, size*8);

  824. 

  825.             /* 'frame size code' and optional 'width, height' */

  826.             if (get_bits(&gb, 3) == 7) {

  827.                 skip_bits(&gb, 12);

  828.                 skip_bits(&gb, 12);

  829.             }

  830. 

  831.             h->halfpel_flag  = get_bits1(&gb);

  832.             h->thirdpel_flag = get_bits1(&gb);

  833. 

  834.             /* unknown fields */

  835.             skip_bits1(&gb);

  836.             skip_bits1(&gb);

  837.             skip_bits1(&gb);

  838.             skip_bits1(&gb);

  839. 

  840.             s->low_delay = get_bits1(&gb);

  841. 

  842.             /* unknown field */

  843.             skip_bits1(&gb);

  844. 

  845.             while (get_bits1(&gb)) {

  846.                 skip_bits(&gb, 8);

  847.             }

  848. 

  849.             h->unknown_svq3_flag = get_bits1(&gb);

  850.             avctx->has_b_frames = !s->low_delay;

  851.             if (h->unknown_svq3_flag) {

  852. #ifdef CONFIG_ZLIB

  853.                 unsigned watermark_width  = svq3_get_ue_golomb(&gb);

  854.                 unsigned watermark_height = svq3_get_ue_golomb(&gb);

  855.                 int u1 = svq3_get_ue_golomb(&gb);

  856.                 int u2 = get_bits(&gb, 8);

  857.                 int u3 = get_bits(&gb, 2);

  858.                 int u4 = svq3_get_ue_golomb(&gb);

  859.                 unsigned buf_len = watermark_width*watermark_height*4;

  860.                 int offset = (get_bits_count(&gb)+7)>>3;

  861.                 uint8_t *buf;

  862. 

  863.                 if ((uint64_t)watermark_width*4 > UINT_MAX/watermark_height)

  864.                     return -1;

  865. 

  866.                 buf = av_malloc(buf_len);

  867.                 av_log(avctx, AV_LOG_DEBUG, "watermark size: %dx%d\n", watermark_width, watermark_height);

  868.                 av_log(avctx, AV_LOG_DEBUG, "u1: %x u2: %x u3: %x compressed data size: %d offset: %d\n", u1, u2, u3, u4, offset);

  869.                 if (uncompress(buf, (uLong*)&buf_len, extradata + 8 + offset, size - offset) != Z_OK) {

  870.                     av_log(avctx, AV_LOG_ERROR, "could not uncompress watermark logo\n");

  871.                     av_free(buf);

  872.                     return -1;

  873.                 }

  874.                 h->svq3_watermark_key = ff_svq1_packet_checksum(buf, buf_len, 0);

  875.                 h->svq3_watermark_key = h->svq3_watermark_key << 16 | h->svq3_watermark_key;

  876.                 av_log(avctx, AV_LOG_DEBUG, "watermark key %#x\n", h->svq3_watermark_key);

  877.                 av_free(buf);

  878. #else

  879.                 av_log(avctx, AV_LOG_ERROR, "this svq3 file contains watermark which need zlib support compiled in\n");

  880.                 return -1;

  881. #endif

  882.             }

  883.         }

  884.     }

  885. 

  886.     return 0;

  887. }

  888. 

  889. static int svq3_decode_frame(AVCodecContext *avctx,

  890.                              void *data, int *data_size,

  891.                              const uint8_t *buf, int buf_size)

  892. {

  893.     MpegEncContext *const s = avctx->priv_data;

  894.     H264Context *const h = avctx->priv_data;

  895.     int m, mb_type;

  896. 

  897.     /* special case for last picture */

  898.     if (buf_size == 0) {

  899.         if (s->next_picture_ptr && !s->low_delay) {

  900.             *(AVFrame *) data = *(AVFrame *) &s->next_picture;

  901.             s->next_picture_ptr = NULL;

  902.             *data_size = sizeof(AVFrame);

  903.         }

  904.         return 0;

  905.     }

  906. 

  907.     init_get_bits (&s->gb, buf, 8*buf_size);

  908. 

  909.     s->mb_x = s->mb_y = h->mb_xy = 0;

  910. 

  911.     if (svq3_decode_slice_header(h))

  912.         return -1;

  913. 

  914.     s->pict_type = h->slice_type;

  915.     s->picture_number = h->slice_num;

  916. 

  917.     if (avctx->debug&FF_DEBUG_PICT_INFO){

  918.         av_log(h->s.avctx, AV_LOG_DEBUG, "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n",

  919.                av_get_pict_type_char(s->pict_type), h->halfpel_flag, h->thirdpel_flag,

  920.                s->adaptive_quant, s->qscale, h->slice_num);

  921.     }

  922. 

  923.     /* for hurry_up == 5 */

  924.     s->current_picture.pict_type = s->pict_type;

  925.     s->current_picture.key_frame = (s->pict_type == FF_I_TYPE);

  926. 

  927.     /* Skip B-frames if we do not have reference frames. */

  928.     if (s->last_picture_ptr == NULL && s->pict_type == FF_B_TYPE)

  929.         return 0;

  930.     /* Skip B-frames if we are in a hurry. */

  931.     if (avctx->hurry_up && s->pict_type == FF_B_TYPE)

  932.         return 0;

  933.     /* Skip everything if we are in a hurry >= 5. */

  934.     if (avctx->hurry_up >= 5)

  935.         return 0;

  936.     if (  (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == FF_B_TYPE)

  937.         ||(avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != FF_I_TYPE)

  938.         || avctx->skip_frame >= AVDISCARD_ALL)

  939.         return 0;

  940. 

  941.     if (s->next_p_frame_damaged) {

  942.         if (s->pict_type == FF_B_TYPE)

  943.             return 0;

  944.         else

  945.             s->next_p_frame_damaged = 0;

  946.     }

  947. 

  948.     if (frame_start(h) < 0)

  949.         return -1;

  950. 

  951.     if (s->pict_type == FF_B_TYPE) {

  952.         h->frame_num_offset = (h->slice_num - h->prev_frame_num);

  953. 

  954.         if (h->frame_num_offset < 0) {

  955.             h->frame_num_offset += 256;

  956.         }

  957.         if (h->frame_num_offset == 0 || h->frame_num_offset >= h->prev_frame_num_offset) {

  958.             av_log(h->s.avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  959.             return -1;

  960.         }

  961.     } else {

  962.         h->prev_frame_num = h->frame_num;

  963.         h->frame_num = h->slice_num;

  964.         h->prev_frame_num_offset = (h->frame_num - h->prev_frame_num);

  965. 

  966.         if (h->prev_frame_num_offset < 0) {

  967.             h->prev_frame_num_offset += 256;

  968.         }

  969.     }

  970. 

  971.     for (m = 0; m < 2; m++){

  972.         int i;

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

  974.             int j;

  975.             for (j = -1; j < 4; j++)

  976.                 h->ref_cache[m][scan8[0] + 8*i + j]= 1;

  977.             if (i < 3)

  978.                 h->ref_cache[m][scan8[0] + 8*i + j]= PART_NOT_AVAILABLE;

  979.         }

  980.     }

  981. 

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

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

  984.             h->mb_xy = s->mb_x + s->mb_y*s->mb_stride;

  985. 

  986.             if ( (get_bits_count(&s->gb) + 7) >= s->gb.size_in_bits &&

  987.                 ((get_bits_count(&s->gb) & 7) == 0 || show_bits(&s->gb, (-get_bits_count(&s->gb) & 7)) == 0)) {

  988. 

  989.                 skip_bits(&s->gb, h->next_slice_index - get_bits_count(&s->gb));

  990.                 s->gb.size_in_bits = 8*buf_size;

  991. 

  992.                 if (svq3_decode_slice_header(h))

  993.                     return -1;

  994. 

  995.                 /* TODO: support s->mb_skip_run */

  996.             }

  997. 

  998.             mb_type = svq3_get_ue_golomb(&s->gb);

  999. 

  1000.             if (s->pict_type == FF_I_TYPE) {

  1001.                 mb_type += 8;

  1002.             } else if (s->pict_type == FF_B_TYPE && mb_type >= 4) {

  1003.                 mb_type += 4;

  1004.             }

  1005.             if (mb_type > 33 || svq3_decode_mb(h, mb_type)) {

  1006.                 av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1007.                 return -1;

  1008.             }

  1009. 

  1010.             if (mb_type != 0) {

  1011.                 hl_decode_mb (h);

  1012.             }

  1013. 

  1014.             if (s->pict_type != FF_B_TYPE && !s->low_delay) {

  1015.                 s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =

  1016.                     (s->pict_type == FF_P_TYPE && mb_type < 8) ? (mb_type - 1) : -1;

  1017.             }

  1018.         }

  1019. 

  1020.         ff_draw_horiz_band(s, 16*s->mb_y, 16);

  1021.     }

  1022. 

  1023.     MPV_frame_end(s);

  1024. 

  1025.     if (s->pict_type == FF_B_TYPE || s->low_delay) {

  1026.         *(AVFrame *) data = *(AVFrame *) &s->current_picture;

  1027.     } else {

  1028.         *(AVFrame *) data = *(AVFrame *) &s->last_picture;

  1029.     }

  1030. 

  1031.     avctx->frame_number = s->picture_number - 1;

  1032. 

  1033.     /* Do not output the last pic after seeking. */

  1034.     if (s->last_picture_ptr || s->low_delay) {

  1035.         *data_size = sizeof(AVFrame);

  1036.     }

  1037. 

  1038.     return buf_size;

  1039. }

  1040. 

  1041. 

  1042. AVCodec svq3_decoder = {

  1043.     "svq3",

  1044.     CODEC_TYPE_VIDEO,

  1045.     CODEC_ID_SVQ3,

  1046.     sizeof(H264Context),

  1047.     svq3_decode_init,

  1048.     NULL,

  1049.     decode_end,

  1050.     svq3_decode_frame,

  1051.     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1052.     .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3"),

  1053. };