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FFmpeg/libavcodec/svq3.c

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  1. /*

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

  3.  *

  4.  * This library is free software; you can redistribute it and/or

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

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

  7.  * version 2 of the License, or (at your option) any later version.

  8.  *

  9.  * This library is distributed in the hope that it will be useful,

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

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

  12.  * Lesser General Public License for more details.

  13.  *

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

  15.  * License along with this library; if not, write to the Free Software

  16.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  17.  *

  18.  *

  19.  * How to use this decoder:

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

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

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

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

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

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

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

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

  28.  *

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

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

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

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

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

  34.  *

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

  36.  * correctly decodes this file:

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

  38.  *

  39.  */

  40.  

  41. /**

  42.  * @file svq3.c

  43.  * svq3 decoder.

  44.  */

  45. 

  46. #define FULLPEL_MODE  1 

  47. #define HALFPEL_MODE  2 

  48. #define THIRDPEL_MODE 3

  49.  

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

  51.  o-->o-->o   o

  52.          |  /|

  53.  o   o   o / o

  54.  | / |   |/  |

  55.  o   o   o   o

  56.    / 

  57.  o-->o-->o-->o

  58. */

  59. static const uint8_t svq3_scan[16]={

  60.  0+0*4, 1+0*4, 2+0*4, 2+1*4,

  61.  2+2*4, 3+0*4, 3+1*4, 3+2*4,

  62.  0+1*4, 0+2*4, 1+1*4, 1+2*4,

  63.  0+3*4, 1+3*4, 2+3*4, 3+3*4,

  64. };

  65. 

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

  67.   { 0, 0 },

  68.   { 1, 0 }, { 0, 1 },

  69.   { 0, 2 }, { 1, 1 }, { 2, 0 },

  70.   { 3, 0 }, { 2, 1 }, { 1, 2 }, { 0, 3 },

  71.   { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

  72.   { 4, 1 }, { 3, 2 }, { 2, 3 }, { 1, 4 },

  73.   { 2, 4 }, { 3, 3 }, { 4, 2 },

  74.   { 4, 3 }, { 3, 4 },

  75.   { 4, 4 }

  76. };

  77. 

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

  79.   { { 2,-1,-1,-1,-1 }, { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 },

  80.     { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 }, { 1, 2,-1,-1,-1 } },

  81.   { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 4, 3 }, { 0, 1, 2, 4, 3 },

  82.     { 0, 2, 1, 4, 3 }, { 2, 0, 1, 3, 4 }, { 0, 4, 2, 1, 3 } },

  83.   { { 2, 0,-1,-1,-1 }, { 2, 1, 0, 4, 3 }, { 1, 2, 4, 0, 3 },

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

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

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

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

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

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

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

  91. };

  92. 

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

  94.   { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  95.     { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  96.   { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  97.     { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  98. };

  99. 

  100. static const uint32_t svq3_dequant_coeff[32] = {

  101.    3881,  4351,  4890,  5481,  6154,  6914,  7761,  8718,

  102.    9781, 10987, 12339, 13828, 15523, 17435, 19561, 21873,

  103.   24552, 27656, 30847, 34870, 38807, 43747, 49103, 54683,

  104.   61694, 68745, 77615, 89113,100253,109366,126635,141533

  105. };

  106. 

  107. 

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

  109.     const int qmul= svq3_dequant_coeff[qp];

  110. #define stride 16

  111.     int i;

  112.     int temp[16];

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

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

  115. 

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

  117.         const int offset= y_offset[i];

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

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

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

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

  122. 

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

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

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

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

  127.     }

  128. 

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

  130.         const int offset= x_offset[i];

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

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

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

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

  135. 

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

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

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

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

  140.     }

  141. }

  142. #undef stride

  143. 

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

  145.     const int qmul= svq3_dequant_coeff[qp];

  146.     int i;

  147.     uint8_t *cm = cropTbl + MAX_NEG_CROP;

  148. 

  149.     if (dc) {

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

  151.         block[0] = 0;

  152.     }

  153. 

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

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

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

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

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

  159. 

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

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

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

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

  164.     }

  165. 

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

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

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

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

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

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

  172. 

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

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

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

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

  177.     }

  178. }

  179. 

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

  181.     LOAD_TOP_EDGE    

  182.     LOAD_LEFT_EDGE    

  183.     const __attribute__((unused)) int unu0= t0;

  184.     const __attribute__((unused)) int unu1= l0;

  185. 

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

  187.     src[1+0*stride]=

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

  189.     src[2+0*stride]=

  190.     src[1+1*stride]=

  191.     src[0+2*stride]=

  192.     src[3+0*stride]=

  193.     src[2+1*stride]=

  194.     src[1+2*stride]=

  195.     src[0+3*stride]=

  196.     src[3+1*stride]=

  197.     src[2+2*stride]=

  198.     src[1+3*stride]=

  199.     src[3+2*stride]=

  200.     src[2+3*stride]=

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

  202. }

  203. 

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

  205.     pred16x16_plane_compat_c(src, stride, 1);

  206. }

  207. 

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

  209. 				     int index, const int type) {

  210. 

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

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

  213. 

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

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

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

  217. 

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

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

  220. 

  221.       if (vlc == INVALID_VLC)

  222. 	return -1;

  223. 

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

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

  226. 

  227.       if (type == 3) {

  228. 	if (vlc < 3) {

  229. 	  run   = 0;

  230. 	  level = vlc;

  231. 	} else if (vlc < 4) {

  232. 	  run   = 1;

  233. 	  level = 1;

  234. 	} else {

  235. 	  run   = (vlc & 0x3);

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

  237. 	}

  238.       } else {

  239. 	if (vlc < 16) {

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

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

  242. 	} else if (intra) {

  243. 	  run   = (vlc & 0x7);

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

  245. 	} else {

  246. 	  run   = (vlc & 0xF);

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

  248. 	}

  249.       }

  250. 

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

  252. 	return -1;

  253. 

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

  255.     }

  256. 

  257.     if (type != 2) {

  258.       break;

  259.     }

  260.   }

  261. 

  262.   return 0;

  263. }

  264. 

  265. static inline void svq3_mc_dir_part (MpegEncContext *s,

  266. 				     int x, int y, int width, int height,

  267. 				     int mx, int my, int dxy,

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

  269. 

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

  271.   uint8_t *src, *dest;

  272.   int i, emu = 0;

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

  274. 

  275.   mx += x;

  276.   my += y;

  277.   

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

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

  280. 

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

  282.       emu = 1;

  283.     }

  284. 

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

  286.     my = clip (my, -16, (s->v_edge_pos - height + 15));

  287.   }

  288. 

  289.   /* form component predictions */

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

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

  292. 

  293.   if (emu) {

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

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

  296.     src = s->edge_emu_buffer;

  297.   }

  298.   if(thirdpel)

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

  300.   else

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

  302. 

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

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

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

  306.     width  = (width  >> 1);

  307.     height = (height >> 1);

  308.     blocksize++;

  309. 

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

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

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

  313. 

  314.       if (emu) {

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

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

  317.         src = s->edge_emu_buffer;

  318.       }

  319.       if(thirdpel)

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

  321.       else

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

  323.     }

  324.   }

  325. }

  326. 

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

  328.   int cbp, dir, mode, mx, my, dx, dy, x, y, part_width, part_height;

  329.   int i, j, k, l, m;

  330.   uint32_t vlc;

  331.   int8_t *top, *left;

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

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

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

  335. 

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

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

  338.   h->topright_samples_available	= 0xFFFF;

  339. 

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

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

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

  343. 

  344.       cbp = 0;

  345.       mb_type = MB_TYPE_SKIP;

  346.     } else {

  347.       for (dir=0; dir < 2; dir++) {

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

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

  350. 	    int dxy;

  351. 	    x = 16*s->mb_x + 4*j;

  352. 	    y = 16*s->mb_y + 4*i;

  353. 

  354. 	    mx = 2*s->next_picture.motion_val[0][b_xy + j + i*h->b_stride][0];

  355. 	    my = 2*s->next_picture.motion_val[0][b_xy + j + i*h->b_stride][1];

  356. 

  357. 	    if (dir == 0) {

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

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

  360. 	    } else {

  361. 	      mx = (mx * (h->frame_num_offset - h->prev_frame_num_offset)) / h->prev_frame_num_offset;

  362. 	      my = (my * (h->frame_num_offset - h->prev_frame_num_offset)) / h->prev_frame_num_offset;

  363. 	    }

  364. 

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

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

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

  368. 

  369. 	    /* update mv_cache */

  370. 	    s->current_picture.motion_val[dir][b_xy + j + i*h->b_stride][0] = 3*mx;

  371. 	    s->current_picture.motion_val[dir][b_xy + j + i*h->b_stride][1] = 3*my;

  372. 

  373. 	    svq3_mc_dir_part (s, x, y, 4, 4, mx>>1, my>>1, dxy, 0, dir, (dir == 1));

  374. 	  }

  375. 	}

  376.       }

  377. 

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

  379. 	return -1;

  380. 

  381.       cbp = golomb_to_inter_cbp[vlc];

  382.       mb_type = MB_TYPE_16x16;

  383.     }

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

  385.     int dir0, dir1;

  386. 

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

  388.       mode = THIRDPEL_MODE;

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

  390.       mode = HALFPEL_MODE;

  391.     } else {

  392.       mode = FULLPEL_MODE;

  393.     }

  394. 

  395.     /* fill caches */

  396.     /* note ref_cache should contain here:

  397.         ????????

  398.         ???11111

  399.         N??11111

  400.         N??11111

  401.         N??11111

  402.         N

  403.     */

  404.     

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

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

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

  408. 	  *(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];

  409. 	}

  410.       } else {

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

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

  413. 	}

  414.       }

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

  416. 	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));

  417. 	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);

  418. 

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

  420. 	  *(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];

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

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

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

  424. 	}else

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

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

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

  428. 	  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;

  429. 	}else

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

  431.       }else

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

  433. 

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

  435. 	break;

  436.     }

  437. 

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

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

  440.       part_width  = ((mb_type & 5) == 5) ? 4 : 8 << (mb_type & 1);

  441.       part_height = 16 >> ((unsigned) mb_type / 3);

  442.       dir0 = 0;

  443.       dir1 = 0;

  444.     } else {	/* B_TYPE */

  445.       part_width  = 16;

  446.       part_height = 16;

  447.       dir0 = (mb_type == 2) ? 1 : 0;

  448.       dir1 = (mb_type == 1) ? 0 : 1;

  449.     }

  450. 

  451.   for (dir=dir0; dir <= dir1; dir++) {

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

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

  454. 	int avg=(dir == 1 && dir0 != dir1);

  455. 	int dxy;

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

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

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

  459. 

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

  461. 

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

  463. 	mx = clip (mx, -6*x, 6*(s->h_edge_pos - part_width  - x));

  464. 	my = clip (my, -6*y, 6*(s->v_edge_pos - part_height - y));

  465. 

  466. 	/* get motion vector differential */

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

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

  469. 

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

  471. 	  return -1;

  472. 	}

  473. 	/* compute motion vector */

  474. 	if (mode == THIRDPEL_MODE) {

  475.           int fx, fy;

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

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

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

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

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

  481. 

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

  483.           mx += mx;

  484.           my += my;

  485. 	} else if (mode == HALFPEL_MODE) {

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

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

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

  489. 

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

  491.           mx *= 3;

  492.           my *= 3;

  493. 	} else {

  494.           assert(mode == FULLPEL_MODE);

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

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

  497. 

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

  499.           mx *= 6;

  500.           my *= 6;

  501. 	}

  502. 

  503.         /* update mv_cache */

  504.         fill_rectangle(h->mv_cache[dir][scan8[k]], part_width>>2, part_height>>2, 8, pack16to32(mx,my), 4);

  505.       }

  506.     }

  507.   }

  508. 

  509.     /* write back or clear motion vectors */

  510.     if (s->pict_type == P_TYPE || mb_type != 2) {

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

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

  513.       }

  514.     } else {

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

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

  517.       }

  518.     }

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

  520.       if (mb_type != 1) {

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

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

  523.         }

  524.       } else {

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

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

  527. 	}

  528.       }

  529.     }

  530. 

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

  532.       return -1;

  533. 

  534.     cbp = golomb_to_inter_cbp[vlc];

  535.     mb_type = MB_TYPE_16x16;

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

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

  538. 

  539.     if (mb_type == 8) {

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

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

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

  543. 	}

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

  545. 	  h->left_samples_available = 0x5F5F;

  546. 	}

  547.       }

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

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

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

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

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

  553. 

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

  555. 	  h->top_samples_available = 0x33FF;

  556. 	}

  557.       }

  558. 

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

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

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

  562. 

  563. 	if (vlc >= 25)

  564. 	  return -1;

  565. 

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

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

  568. 

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

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

  571. 

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

  573. 	  return -1;

  574.       }

  575.     } else {

  576.       /* DC_128_PRED block type */

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

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

  579.       }

  580.     }

  581. 

  582.     write_back_intra_pred_mode (h);

  583. 

  584.     if (mb_type == 8) {

  585.       check_intra4x4_pred_mode (h);

  586. 

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

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

  589.     } else {

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

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

  592.       }

  593. 

  594.       h->top_samples_available  = 0x33FF;

  595.       h->left_samples_available = 0x5F5F;

  596.     }

  597. 

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

  599.       return -1;

  600. 

  601.     cbp = golomb_to_intra4x4_cbp[vlc];

  602.     mb_type = MB_TYPE_INTRA4x4;

  603.   } else {			/* INTRA16x16 */

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

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

  606. 

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

  608.       return -1;

  609. 

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

  611.     mb_type = MB_TYPE_INTRA16x16;

  612.   }

  613. 

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

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

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

  617.     }

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

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

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

  621.       }

  622.     }

  623.   }

  624.   if (!IS_INTRA4x4(mb_type)) {

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

  626.   }

  627.   if (!IS_SKIP(mb_type)) {

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

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

  630.   }

  631. 

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

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

  634. 

  635.     if (s->qscale > 31)

  636.       return -1;

  637.   }

  638.   if (IS_INTRA16x16(mb_type)) {

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

  640.       return -1;

  641.   }

  642. 

  643.   if (!IS_SKIP(mb_type) && cbp) {

  644.     l = IS_INTRA16x16(mb_type) ? 1 : 0;

  645.     m = ((s->qscale < 24 && IS_INTRA4x4(mb_type)) ? 2 : 1);

  646. 

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

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

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

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

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

  652. 

  653. 	  if (svq3_decode_block (&s->gb, &h->mb[16*k], l, m))

  654. 	    return -1;

  655. 	}

  656.       }

  657.     }

  658. 

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

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

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

  662. 	  return -1;

  663.       }

  664. 

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

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

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

  668. 

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

  670. 	    return -1;

  671. 	}

  672.       }

  673.     }

  674.   }

  675. 

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

  677. 

  678.   if (IS_INTRA(mb_type)) {

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

  680.   }

  681. 

  682.   return 0;

  683. }

  684. 

  685. static int svq3_decode_slice_header (H264Context *h) {

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

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

  688.   int i, header;

  689. 

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

  691. 

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

  693.     /* TODO: what? */

  694.     fprintf (stderr, "unsupported slice header (%02X)\n", header);

  695.     return -1;

  696.   } else {

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

  698. 

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

  700. 

  701.     if (h->next_slice_index > s->gb.size_in_bits)

  702.       return -1;

  703. 

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

  705.     s->gb.index += 8;

  706. 

  707.     if (length > 0) {

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

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

  710.     }

  711.   }

  712. 

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

  714.     return -1;

  715. 

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

  717. 

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

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

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

  721.   } else {

  722.     get_bits1 (&s->gb);

  723.     s->mb_skip_run = 0;

  724.   }

  725. 

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

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

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

  729. 

  730.   /* unknown fields */

  731.   get_bits1 (&s->gb);

  732. 

  733.   if (h->unknown_svq3_flag) {

  734.     get_bits1 (&s->gb);

  735.   }

  736. 

  737.   get_bits1 (&s->gb);

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

  739. 

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

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

  742.   }

  743. 

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

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

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

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

  748.   }

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

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

  751. 

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

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

  754.     }

  755.   }

  756. 

  757.   return 0;

  758. }

  759. 

  760. static int svq3_decode_frame (AVCodecContext *avctx,

  761. 			      void *data, int *data_size,

  762. 			      uint8_t *buf, int buf_size) {

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

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

  765.   int m, mb_type;

  766. 

  767.   *data_size = 0;

  768. 

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

  770.   

  771.   if (!s->context_initialized) {

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

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

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

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

  776.     h->halfpel_flag = 1;

  777.     h->thirdpel_flag = 1;

  778.     h->unknown_svq3_flag = 0;

  779.     h->chroma_qp = 4;

  780. 

  781.     if (MPV_common_init (s) < 0)

  782.       return -1;

  783. 

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

  785. 

  786.     alloc_tables (h);

  787. 

  788.     if (avctx->extradata && avctx->extradata_size >= 0x64

  789. 	&& !memcmp (avctx->extradata, "SVQ3", 4)) {

  790. 

  791.       GetBitContext gb;

  792. 

  793.       init_get_bits (&gb, (uint8_t *) avctx->extradata + 0x62,

  794. 		     8*(avctx->extradata_size - 0x62));

  795. 

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

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

  798. 	get_bits (&gb, 12);

  799. 	get_bits (&gb, 12);

  800.       }

  801. 

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

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

  804. 

  805.       /* unknown fields */

  806.       get_bits1 (&gb);

  807.       get_bits1 (&gb);

  808.       get_bits1 (&gb);

  809.       get_bits1 (&gb);

  810. 

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

  812. 

  813.       /* unknown field */

  814.       get_bits1 (&gb);

  815. 

  816.       while (get_bits1 (&gb)) {

  817. 	get_bits (&gb, 8);

  818.       }

  819. 

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

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

  822.     }

  823.   }

  824. 

  825.   /* special case for last picture */

  826.   if (buf_size == 0) {

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

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

  829.       *data_size = sizeof(AVFrame);

  830.     }

  831.     return 0;

  832.   }

  833. 

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

  835. 

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

  837. 

  838.   if (svq3_decode_slice_header (h))

  839.     return -1;

  840. 

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

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

  843. 

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

  845.       printf("%c hpel:%d, tpel:%d aqp:%d qp:%d\n", 

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

  847.       s->adaptive_quant, s->qscale

  848.       );

  849.   }

  850. 

  851.   /* for hurry_up==5 */

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

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

  854. 

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

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

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

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

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

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

  861. 

  862.   if (s->next_p_frame_damaged) {

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

  864.       return 0;

  865.     else

  866.       s->next_p_frame_damaged = 0;

  867.   }

  868. 

  869.   frame_start (h);

  870. 

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

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

  873. 

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

  875.       h->frame_num_offset += 256;

  876.     }

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

  878.       printf ("error in B-frame picture id\n");

  879.       return -1;

  880.     }

  881.   } else {

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

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

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

  885. 

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

  887.       h->prev_frame_num_offset += 256;

  888.     }

  889.   }

  890. 

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

  892.     int i;

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

  894.       int j;

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

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

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

  898.     }

  899.   }

  900.   

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

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

  903. 

  904.       if ( (s->gb.index + 7) >= s->gb.size_in_bits &&

  905. 	  ((s->gb.index & 7) == 0 || show_bits (&s->gb, (-s->gb.index & 7)) == 0)) {

  906. 

  907. 	s->gb.index = h->next_slice_index;

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

  909. 

  910. 	if (svq3_decode_slice_header (h))

  911. 	  return -1;

  912. 

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

  914.       }

  915. 

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

  917. 

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

  919. 	mb_type += 8;

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

  921. 	mb_type += 4;

  922.       }

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

  924. 	fprintf (stderr, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  925. 	return -1;

  926.       }

  927. 

  928.       if (mb_type != 0) {

  929. 	hl_decode_mb (h);

  930.       }

  931.     }

  932. 

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

  934.   }

  935. 

  936.   MPV_frame_end(s);

  937. 

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

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

  940.   } else {

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

  942.   }

  943. 

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

  945. 

  946.   /* dont output the last pic after seeking */

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

  948.     *data_size = sizeof(AVFrame);

  949.   }

  950. 

  951.   return buf_size;

  952. }

  953. 

  954. 

  955. AVCodec svq3_decoder = {

  956.     "svq3",

  957.     CODEC_TYPE_VIDEO,

  958.     CODEC_ID_SVQ3,

  959.     sizeof(H264Context),

  960.     decode_init,

  961.     NULL,

  962.     decode_end,

  963.     svq3_decode_frame,

  964.     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,

  965. };