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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.  * How to use this decoder:

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

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

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

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

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

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

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

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

  30.  *

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

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

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

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

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

  36.  *

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

  38.  * correctly decodes this file:

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

  40.  *

  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 __attribute__((unused)) int unu0= t0;

  187.     const __attribute__((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 = clip (mx, -16, (s->h_edge_pos - width  + 15));

  289.     my = 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 = clip (mx, extra_width - 6*x, h_edge_pos - 6*x);

  365.       my = 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_bits (&s->gb, 1)) {

  469.       mode = THIRDPEL_MODE;

  470.     } else if (h->halfpel_flag && h->thirdpel_flag == !get_bits (&s->gb, 1)) {

  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.         N

  484.     */

  485. 

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

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

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

  489.           *(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];

  490.         }

  491.       } else {

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

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

  494.         }

  495.       }

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

  497.         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));

  498.         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);

  499. 

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

  501.           *(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];

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

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

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

  505.         }else

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

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

  508.           *(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];

  509.           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;

  510.         }else

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

  512.       }else

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

  514. 

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

  516.         break;

  517.     }

  518. 

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

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

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

  522.         return -1;

  523.     } else {        /* B_TYPE */

  524.       if (mb_type != 2) {

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

  526.           return -1;

  527.       } else {

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

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

  530.         }

  531.       }

  532.       if (mb_type != 1) {

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

  534.           return -1;

  535.       } else {

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

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

  538.         }

  539.       }

  540.     }

  541. 

  542.     mb_type = MB_TYPE_16x16;

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

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

  545. 

  546.     if (mb_type == 8) {

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

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

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

  550.         }

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

  552.           h->left_samples_available = 0x5F5F;

  553.         }

  554.       }

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

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

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

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

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

  560. 

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

  562.           h->top_samples_available = 0x33FF;

  563.         }

  564.       }

  565. 

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

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

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

  569. 

  570.         if (vlc >= 25){

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

  572.           return -1;

  573.         }

  574. 

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

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

  577. 

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

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

  580. 

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

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

  583.           return -1;

  584.         }

  585.       }

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

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

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

  589.       }

  590.     }

  591. 

  592.     write_back_intra_pred_mode (h);

  593. 

  594.     if (mb_type == 8) {

  595.       check_intra4x4_pred_mode (h);

  596. 

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

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

  599.     } else {

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

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

  602.       }

  603. 

  604.       h->top_samples_available  = 0x33FF;

  605.       h->left_samples_available = 0x5F5F;

  606.     }

  607. 

  608.     mb_type = MB_TYPE_INTRA4x4;

  609.   } else {                      /* INTRA16x16 */

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

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

  612. 

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

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

  615.       return -1;

  616.     }

  617. 

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

  619.     mb_type = MB_TYPE_INTRA16x16;

  620.   }

  621. 

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

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

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

  625.     }

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

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

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

  629.       }

  630.     }

  631.   }

  632.   if (!IS_INTRA4x4(mb_type)) {

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

  634.   }

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

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

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

  638.   }

  639. 

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

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

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

  643.       return -1;

  644.     }

  645. 

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

  647.   }

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

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

  650. 

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

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

  653.       return -1;

  654.     }

  655.   }

  656.   if (IS_INTRA16x16(mb_type)) {

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

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

  659.       return -1;

  660.     }

  661.   }

  662. 

  663.   if (cbp) {

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

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

  666. 

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

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

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

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

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

  672. 

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

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

  675.             return -1;

  676.           }

  677.         }

  678.       }

  679.     }

  680. 

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

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

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

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

  685.           return -1;

  686.         }

  687.       }

  688. 

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

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

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

  692. 

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

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

  695.             return -1;

  696.           }

  697.         }

  698.       }

  699.     }

  700.   }

  701. 

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

  703. 

  704.   if (IS_INTRA(mb_type)) {

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

  706.   }

  707. 

  708.   return 0;

  709. }

  710. 

  711. static int svq3_decode_slice_header (H264Context *h) {

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

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

  714.   int i, header;

  715. 

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

  717. 

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

  719.     /* TODO: what? */

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

  721.     return -1;

  722.   } else {

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

  724. 

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

  726. 

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

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

  729.       return -1;

  730.     }

  731. 

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

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

  734. 

  735.     if (length > 0) {

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

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

  738.     }

  739.   }

  740. 

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

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

  743.     return -1;

  744.   }

  745. 

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

  747. 

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

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

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

  751.   } else {

  752.     get_bits1 (&s->gb);

  753.     s->mb_skip_run = 0;

  754.   }

  755. 

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

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

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

  759. 

  760.   /* unknown fields */

  761.   get_bits1 (&s->gb);

  762. 

  763.   if (h->unknown_svq3_flag) {

  764.     get_bits1 (&s->gb);

  765.   }

  766. 

  767.   get_bits1 (&s->gb);

  768.   get_bits (&s->gb, 2);

  769. 

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

  771.     get_bits (&s->gb, 8);

  772.   }

  773. 

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

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

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

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

  778.   }

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

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

  781. 

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

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

  784.     }

  785.   }

  786. 

  787.   return 0;

  788. }

  789. 

  790. static int svq3_decode_frame (AVCodecContext *avctx,

  791.                               void *data, int *data_size,

  792.                               uint8_t *buf, int buf_size) {

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

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

  795.   int m, mb_type;

  796.   unsigned char *extradata;

  797.   unsigned int size;

  798. 

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

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

  801.   s->unrestricted_mv = 1;

  802. 

  803.   if (!s->context_initialized) {

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

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

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

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

  808.     h->halfpel_flag = 1;

  809.     h->thirdpel_flag = 1;

  810.     h->unknown_svq3_flag = 0;

  811.     h->chroma_qp = 4;

  812. 

  813.     if (MPV_common_init (s) < 0)

  814.       return -1;

  815. 

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

  817. 

  818.     alloc_tables (h);

  819. 

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

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

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

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

  824.         break;

  825.       extradata++;

  826.     }

  827. 

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

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

  830. 

  831.       GetBitContext gb;

  832. 

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

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

  835. 

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

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

  838.         get_bits (&gb, 12);

  839.         get_bits (&gb, 12);

  840.       }

  841. 

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

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

  844. 

  845.       /* unknown fields */

  846.       get_bits1 (&gb);

  847.       get_bits1 (&gb);

  848.       get_bits1 (&gb);

  849.       get_bits1 (&gb);

  850. 

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

  852. 

  853.       /* unknown field */

  854.       get_bits1 (&gb);

  855. 

  856.       while (get_bits1 (&gb)) {

  857.         get_bits (&gb, 8);

  858.       }

  859. 

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

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

  862.     }

  863.   }

  864. 

  865.   /* special case for last picture */

  866.   if (buf_size == 0) {

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

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

  869.       *data_size = sizeof(AVFrame);

  870.     }

  871.     return 0;

  872.   }

  873. 

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

  875. 

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

  877. 

  878.   if (svq3_decode_slice_header (h))

  879.     return -1;

  880. 

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

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

  883. 

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

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

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

  887.       s->adaptive_quant, s->qscale

  888.       );

  889.   }

  890. 

  891.   /* for hurry_up==5 */

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

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

  894. 

  895.   /* skip b frames if we dont have reference frames */

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

  897.   /* skip b frames if we are in a hurry */

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

  899.   /* skip everything if we are in a hurry >= 5 */

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

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

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

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

  904.       return 0;

  905. 

  906.   if (s->next_p_frame_damaged) {

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

  908.       return 0;

  909.     else

  910.       s->next_p_frame_damaged = 0;

  911.   }

  912. 

  913.   if (frame_start (h) < 0)

  914.     return -1;

  915. 

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

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

  918. 

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

  920.       h->frame_num_offset += 256;

  921.     }

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

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

  924.       return -1;

  925.     }

  926.   } else {

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

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

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

  930. 

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

  932.       h->prev_frame_num_offset += 256;

  933.     }

  934.   }

  935. 

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

  937.     int i;

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

  939.       int j;

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

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

  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.   /* dont 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. };