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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. /**

  44.  * @file svq3.c

  45.  * svq3 decoder.

  46.  */

  47. 

  48. #define FULLPEL_MODE  1

  49. #define HALFPEL_MODE  2

  50. #define THIRDPEL_MODE 3

  51. #define PREDICT_MODE  4

  52. 

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

  54.  o-->o-->o   o

  55.          |  /|

  56.  o   o   o / o

  57.  | / |   |/  |

  58.  o   o   o   o

  59.    /

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

  61. */

  62. static const uint8_t svq3_scan[16]={

  63.  0+0*4, 1+0*4, 2+0*4, 2+1*4,

  64.  2+2*4, 3+0*4, 3+1*4, 3+2*4,

  65.  0+1*4, 0+2*4, 1+1*4, 1+2*4,

  66.  0+3*4, 1+3*4, 2+3*4, 3+3*4,

  67. };

  68. 

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

  70.   { 0, 0 },

  71.   { 1, 0 }, { 0, 1 },

  72.   { 0, 2 }, { 1, 1 }, { 2, 0 },

  73.   { 3, 0 }, { 2, 1 }, { 1, 2 }, { 0, 3 },

  74.   { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

  75.   { 4, 1 }, { 3, 2 }, { 2, 3 }, { 1, 4 },

  76.   { 2, 4 }, { 3, 3 }, { 4, 2 },

  77.   { 4, 3 }, { 3, 4 },

  78.   { 4, 4 }

  79. };

  80. 

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

  82.   { { 2,-1,-1,-1,-1 }, { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 },

  83.     { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 }, { 1, 2,-1,-1,-1 } },

  84.   { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 4, 3 }, { 0, 1, 2, 4, 3 },

  85.     { 0, 2, 1, 4, 3 }, { 2, 0, 1, 3, 4 }, { 0, 4, 2, 1, 3 } },

  86.   { { 2, 0,-1,-1,-1 }, { 2, 1, 0, 4, 3 }, { 1, 2, 4, 0, 3 },

  87.     { 2, 1, 0, 4, 3 }, { 2, 1, 4, 3, 0 }, { 1, 2, 4, 0, 3 } },

  88.   { { 2, 0,-1,-1,-1 }, { 2, 0, 1, 4, 3 }, { 1, 2, 0, 4, 3 },

  89.     { 2, 1, 0, 4, 3 }, { 2, 1, 3, 4, 0 }, { 2, 4, 1, 0, 3 } },

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

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

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

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

  94. };

  95. 

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

  97.   { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  98.     { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  99.   { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  100.     { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  101. };

  102. 

  103. static const uint32_t svq3_dequant_coeff[32] = {

  104.    3881,  4351,  4890,  5481,  6154,  6914,  7761,  8718,

  105.    9781, 10987, 12339, 13828, 15523, 17435, 19561, 21873,

  106.   24552, 27656, 30847, 34870, 38807, 43747, 49103, 54683,

  107.   61694, 68745, 77615, 89113,100253,109366,126635,141533

  108. };

  109. 

  110. 

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

  112.     const int qmul= svq3_dequant_coeff[qp];

  113. #define stride 16

  114.     int i;

  115.     int temp[16];

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

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

  118. 

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

  120.         const int offset= y_offset[i];

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

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

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

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

  125. 

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

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

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

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

  130.     }

  131. 

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

  133.         const int offset= x_offset[i];

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

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

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

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

  138. 

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

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

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

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

  143.     }

  144. }

  145. #undef stride

  146. 

  147. static void svq3_add_idct_c (uint8_t *dst, DCTELEM *block, int stride, int qp, int dc){

  148.     const int qmul= svq3_dequant_coeff[qp];

  149.     int i;

  150.     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

  151. 

  152.     if (dc) {

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

  154.         block[0] = 0;

  155.     }

  156. 

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

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

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

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

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

  162. 

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

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

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

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

  167.     }

  168. 

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

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

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

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

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

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

  175. 

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

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

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

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

  180.     }

  181. }

  182. 

  183. static void pred4x4_down_left_svq3_c(uint8_t *src, uint8_t *topright, int stride){

  184.     LOAD_TOP_EDGE

  185.     LOAD_LEFT_EDGE

  186.     const av_unused int unu0= t0;

  187.     const av_unused int unu1= l0;

  188. 

  189.     src[0+0*stride]=(l1 + t1)>>1;

  190.     src[1+0*stride]=

  191.     src[0+1*stride]=(l2 + t2)>>1;

  192.     src[2+0*stride]=

  193.     src[1+1*stride]=

  194.     src[0+2*stride]=

  195.     src[3+0*stride]=

  196.     src[2+1*stride]=

  197.     src[1+2*stride]=

  198.     src[0+3*stride]=

  199.     src[3+1*stride]=

  200.     src[2+2*stride]=

  201.     src[1+3*stride]=

  202.     src[3+2*stride]=

  203.     src[2+3*stride]=

  204.     src[3+3*stride]=(l3 + t3)>>1;

  205. }

  206. 

  207. static void pred16x16_plane_svq3_c(uint8_t *src, int stride){

  208.     pred16x16_plane_compat_c(src, stride, 1);

  209. }

  210. 

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

  212.                                      int index, const int type) {

  213. 

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

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

  216. 

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

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

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

  220. 

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

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

  223. 

  224.       if (vlc == INVALID_VLC)

  225.         return -1;

  226. 

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

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

  229. 

  230.       if (type == 3) {

  231.         if (vlc < 3) {

  232.           run   = 0;

  233.           level = vlc;

  234.         } else if (vlc < 4) {

  235.           run   = 1;

  236.           level = 1;

  237.         } else {

  238.           run   = (vlc & 0x3);

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

  240.         }

  241.       } else {

  242.         if (vlc < 16) {

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

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

  245.         } else if (intra) {

  246.           run   = (vlc & 0x7);

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

  248.         } else {

  249.           run   = (vlc & 0xF);

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

  251.         }

  252.       }

  253. 

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

  255.         return -1;

  256. 

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

  258.     }

  259. 

  260.     if (type != 2) {

  261.       break;

  262.     }

  263.   }

  264. 

  265.   return 0;

  266. }

  267. 

  268. static inline void svq3_mc_dir_part (MpegEncContext *s,

  269.                                      int x, int y, int width, int height,

  270.                                      int mx, int my, int dxy,

  271.                                      int thirdpel, int dir, int avg) {

  272. 

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

  274.   uint8_t *src, *dest;

  275.   int i, emu = 0;

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

  277. 

  278.   mx += x;

  279.   my += y;

  280. 

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

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

  283. 

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

  285.       emu = 1;

  286.     }

  287. 

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

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

  290.   }

  291. 

  292.   /* form component predictions */

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

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

  295. 

  296.   if (emu) {

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

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

  299.     src = s->edge_emu_buffer;

  300.   }

  301.   if(thirdpel)

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

  303.   else

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

  305. 

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

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

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

  309.     width  = (width  >> 1);

  310.     height = (height >> 1);

  311.     blocksize++;

  312. 

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

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

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

  316. 

  317.       if (emu) {

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

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

  320.         src = s->edge_emu_buffer;

  321.       }

  322.       if(thirdpel)

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

  324.       else

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

  326.     }

  327.   }

  328. }

  329. 

  330. static inline int svq3_mc_dir (H264Context *h, int size, int mode, int dir, int avg) {

  331. 

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

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

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

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

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

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

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

  339. 

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

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

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

  343.       int dxy;

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

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

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

  347. 

  348.       if (mode != PREDICT_MODE) {

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

  350.       } else {

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

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

  353. 

  354.         if (dir == 0) {

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

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

  357.         } else {

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

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

  360.         }

  361.       }

  362. 

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

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

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

  366. 

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

  368.       if (mode == PREDICT_MODE) {

  369.         dx = dy = 0;

  370.       } else {

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

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

  373. 

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

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

  376.           return -1;

  377.         }

  378.       }

  379. 

  380.       /* compute motion vector */

  381.       if (mode == THIRDPEL_MODE) {

  382.         int fx, fy;

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

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

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

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

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

  388. 

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

  390.         mx += mx;

  391.         my += my;

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

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

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

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

  396. 

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

  398.         mx *= 3;

  399.         my *= 3;

  400.       } else {

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

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

  403. 

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

  405.         mx *= 6;

  406.         my *= 6;

  407.       }

  408. 

  409.       /* update mv_cache */

  410.       if (mode != PREDICT_MODE) {

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

  412. 

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

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

  415. 

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

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

  418.           }

  419.         }

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

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

  422.         }

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

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

  425.         }

  426.       }

  427. 

  428.       /* write back motion vectors */

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

  430.     }

  431.   }

  432. 

  433.   return 0;

  434. }

  435. 

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

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

  438.   int cbp = 0;

  439.   uint32_t vlc;

  440.   int8_t *top, *left;

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

  442.   const int mb_xy = s->mb_x + s->mb_y*s->mb_stride;

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

  444. 

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

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

  447.   h->topright_samples_available        = 0xFFFF;

  448. 

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

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

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

  452. 

  453.       if (s->pict_type == B_TYPE) {

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

  455.       }

  456. 

  457.       mb_type = MB_TYPE_SKIP;

  458.     } else {

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

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

  461.         return -1;

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

  463.         return -1;

  464. 

  465.       mb_type = MB_TYPE_16x16;

  466.     }

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

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

  469.       mode = THIRDPEL_MODE;

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

  471.       mode = HALFPEL_MODE;

  472.     } else {

  473.       mode = FULLPEL_MODE;

  474.     }

  475. 

  476.     /* fill caches */

  477.     /* note ref_cache should contain here:

  478.         ????????

  479.         ???11111

  480.         N??11111

  481.         N??11111

  482.         N??11111

  483.     */

  484. 

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

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

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

  488.           *(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];

  489.         }

  490.       } else {

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

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

  493.         }

  494.       }

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

  496.         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));

  497.         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);

  498. 

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

  500.           *(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];

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

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

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

  504.         }else

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

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

  507.           *(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];

  508.           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;

  509.         }else

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

  511.       }else

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

  513. 

  514.       if (s->pict_type != B_TYPE)

  515.         break;

  516.     }

  517. 

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

  519.     if (s->pict_type == P_TYPE) {

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

  521.         return -1;

  522.     } else {        /* B_TYPE */

  523.       if (mb_type != 2) {

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

  525.           return -1;

  526.       } else {

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

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

  529.         }

  530.       }

  531.       if (mb_type != 1) {

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

  533.           return -1;

  534.       } else {

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

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

  537.         }

  538.       }

  539.     }

  540. 

  541.     mb_type = MB_TYPE_16x16;

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

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

  544. 

  545.     if (mb_type == 8) {

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

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

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

  549.         }

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

  551.           h->left_samples_available = 0x5F5F;

  552.         }

  553.       }

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

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

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

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

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

  559. 

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

  561.           h->top_samples_available = 0x33FF;

  562.         }

  563.       }

  564. 

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

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

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

  568. 

  569.         if (vlc >= 25){

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

  571.           return -1;

  572.         }

  573. 

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

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

  576. 

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

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

  579. 

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

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

  582.           return -1;

  583.         }

  584.       }

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

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

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

  588.       }

  589.     }

  590. 

  591.     write_back_intra_pred_mode (h);

  592. 

  593.     if (mb_type == 8) {

  594.       check_intra4x4_pred_mode (h);

  595. 

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

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

  598.     } else {

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

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

  601.       }

  602. 

  603.       h->top_samples_available  = 0x33FF;

  604.       h->left_samples_available = 0x5F5F;

  605.     }

  606. 

  607.     mb_type = MB_TYPE_INTRA4x4;

  608.   } else {                      /* INTRA16x16 */

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

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

  611. 

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

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

  614.       return -1;

  615.     }

  616. 

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

  618.     mb_type = MB_TYPE_INTRA16x16;

  619.   }

  620. 

  621.   if (!IS_INTER(mb_type) && s->pict_type != I_TYPE) {

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

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

  624.     }

  625.     if (s->pict_type == B_TYPE) {

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

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

  628.       }

  629.     }

  630.   }

  631.   if (!IS_INTRA4x4(mb_type)) {

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

  633.   }

  634.   if (!IS_SKIP(mb_type) || s->pict_type == B_TYPE) {

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

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

  637.   }

  638. 

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

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

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

  642.       return -1;

  643.     }

  644. 

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

  646.   }

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

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

  649. 

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

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

  652.       return -1;

  653.     }

  654.   }

  655.   if (IS_INTRA16x16(mb_type)) {

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

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

  658.       return -1;

  659.     }

  660.   }

  661. 

  662.   if (cbp) {

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

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

  665. 

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

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

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

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

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

  671. 

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

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

  674.             return -1;

  675.           }

  676.         }

  677.       }

  678.     }

  679. 

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

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

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

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

  684.           return -1;

  685.         }

  686.       }

  687. 

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

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

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

  691. 

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

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

  694.             return -1;

  695.           }

  696.         }

  697.       }

  698.     }

  699.   }

  700. 

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

  702. 

  703.   if (IS_INTRA(mb_type)) {

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

  705.   }

  706. 

  707.   return 0;

  708. }

  709. 

  710. static int svq3_decode_slice_header (H264Context *h) {

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

  712.   const int mb_xy = s->mb_x + s->mb_y*s->mb_stride;

  713.   int i, header;

  714. 

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

  716. 

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

  718.     /* TODO: what? */

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

  720.     return -1;

  721.   } else {

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

  723. 

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

  725. 

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

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

  728.       return -1;

  729.     }

  730. 

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

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

  733. 

  734.     if (length > 0) {

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

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

  737.     }

  738.   }

  739. 

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

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

  742.     return -1;

  743.   }

  744. 

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

  746. 

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

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

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

  750.   } else {

  751.     skip_bits1 (&s->gb);

  752.     s->mb_skip_run = 0;

  753.   }

  754. 

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

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

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

  758. 

  759.   /* unknown fields */

  760.   skip_bits1 (&s->gb);

  761. 

  762.   if (h->unknown_svq3_flag) {

  763.     skip_bits1 (&s->gb);

  764.   }

  765. 

  766.   skip_bits1 (&s->gb);

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

  768. 

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

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

  771.   }

  772. 

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

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

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

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

  777.   }

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

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

  780. 

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

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

  783.     }

  784.   }

  785. 

  786.   return 0;

  787. }

  788. 

  789. static int svq3_decode_frame (AVCodecContext *avctx,

  790.                               void *data, int *data_size,

  791.                               uint8_t *buf, int buf_size) {

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

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

  794.   int m, mb_type;

  795.   unsigned char *extradata;

  796.   unsigned int size;

  797. 

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

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

  800.   s->unrestricted_mv = 1;

  801. 

  802.   if (!s->context_initialized) {

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

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

  805.     h->pred4x4[DIAG_DOWN_LEFT_PRED] = pred4x4_down_left_svq3_c;

  806.     h->pred16x16[PLANE_PRED8x8] = pred16x16_plane_svq3_c;

  807.     h->halfpel_flag = 1;

  808.     h->thirdpel_flag = 1;

  809.     h->unknown_svq3_flag = 0;

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

  811. 

  812.     if (MPV_common_init (s) < 0)

  813.       return -1;

  814. 

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

  816. 

  817.     alloc_tables (h);

  818. 

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

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

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

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

  823.         break;

  824.       extradata++;

  825.     }

  826. 

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

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

  829. 

  830.       GetBitContext gb;

  831. 

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

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

  834. 

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

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

  837.         skip_bits (&gb, 12);

  838.         skip_bits (&gb, 12);

  839.       }

  840. 

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

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

  843. 

  844.       /* unknown fields */

  845.       skip_bits1 (&gb);

  846.       skip_bits1 (&gb);

  847.       skip_bits1 (&gb);

  848.       skip_bits1 (&gb);

  849. 

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

  851. 

  852.       /* unknown field */

  853.       skip_bits1 (&gb);

  854. 

  855.       while (get_bits1 (&gb)) {

  856.         skip_bits (&gb, 8);

  857.       }

  858. 

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

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

  861.     }

  862.   }

  863. 

  864.   /* special case for last picture */

  865.   if (buf_size == 0) {

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

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

  868.       *data_size = sizeof(AVFrame);

  869.     }

  870.     return 0;

  871.   }

  872. 

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

  874. 

  875.   s->mb_x = s->mb_y = 0;

  876. 

  877.   if (svq3_decode_slice_header (h))

  878.     return -1;

  879. 

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

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

  882. 

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

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

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

  886.       s->adaptive_quant, s->qscale

  887.       );

  888.   }

  889. 

  890.   /* for hurry_up==5 */

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

  892.   s->current_picture.key_frame = (s->pict_type == I_TYPE);

  893. 

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

  895.   if (s->last_picture_ptr == NULL && s->pict_type == B_TYPE) return 0;

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

  897.   if (avctx->hurry_up && s->pict_type == B_TYPE) return 0;

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

  899.   if (avctx->hurry_up >= 5) return 0;

  900.   if(  (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==B_TYPE)

  901.      ||(avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=I_TYPE)

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

  903.       return 0;

  904. 

  905.   if (s->next_p_frame_damaged) {

  906.     if (s->pict_type == B_TYPE)

  907.       return 0;

  908.     else

  909.       s->next_p_frame_damaged = 0;

  910.   }

  911. 

  912.   if (frame_start (h) < 0)

  913.     return -1;

  914. 

  915.   if (s->pict_type == B_TYPE) {

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

  917. 

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

  919.       h->frame_num_offset += 256;

  920.     }

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

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

  923.       return -1;

  924.     }

  925.   } else {

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

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

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

  929. 

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

  931.       h->prev_frame_num_offset += 256;

  932.     }

  933.   }

  934. 

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

  936.     int i;

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

  938.       int j;

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

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

  941.       if(i<3)

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

  943.     }

  944.   }

  945. 

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

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

  948. 

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

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

  951. 

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

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

  954. 

  955.         if (svq3_decode_slice_header (h))

  956.           return -1;

  957. 

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

  959.       }

  960. 

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

  962. 

  963.       if (s->pict_type == I_TYPE) {

  964.         mb_type += 8;

  965.       } else if (s->pict_type == B_TYPE && mb_type >= 4) {

  966.         mb_type += 4;

  967.       }

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

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

  970.         return -1;

  971.       }

  972. 

  973.       if (mb_type != 0) {

  974.         hl_decode_mb (h);

  975.       }

  976. 

  977.       if (s->pict_type != B_TYPE && !s->low_delay) {

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

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

  980.       }

  981.     }

  982. 

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

  984.   }

  985. 

  986.   MPV_frame_end(s);

  987. 

  988.   if (s->pict_type == B_TYPE || s->low_delay) {

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

  990.   } else {

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

  992.   }

  993. 

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

  995. 

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

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

  998.     *data_size = sizeof(AVFrame);

  999.   }

  1000. 

  1001.   return buf_size;

  1002. }

  1003. 

  1004. 

  1005. AVCodec svq3_decoder = {

  1006.     "svq3",

  1007.     CODEC_TYPE_VIDEO,

  1008.     CODEC_ID_SVQ3,

  1009.     sizeof(H264Context),

  1010.     decode_init,

  1011.     NULL,

  1012.     decode_end,

  1013.     svq3_decode_frame,

  1014.     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1015. };