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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.  *  http://samples.mplayerhq.hu/V-codecs/SVQ3/Vertical400kbit.sorenson3.mov

  41.  */

  42. #include "internal.h"

  43. #include "dsputil.h"

  44. #include "avcodec.h"

  45. #include "mpegvideo.h"

  46. #include "h264.h"

  47. 

  48. #include "h264data.h" //FIXME FIXME FIXME

  49. 

  50. #include "h264_mvpred.h"

  51. #include "golomb.h"

  52. #include "rectangle.h"

  53. #include "vdpau_internal.h"

  54. 

  55. #if CONFIG_ZLIB

  56. #include <zlib.h>

  57. #endif

  58. 

  59. #include "svq1.h"

  60. 

  61. /**

  62.  * @file libavcodec/svq3.c

  63.  * svq3 decoder.

  64.  */

  65. 

  66. #define FULLPEL_MODE  1

  67. #define HALFPEL_MODE  2

  68. #define THIRDPEL_MODE 3

  69. #define PREDICT_MODE  4

  70. 

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

  72.  o-->o-->o   o

  73.          |  /|

  74.  o   o   o / o

  75.  | / |   |/  |

  76.  o   o   o   o

  77.    /

  78.  o-->o-->o-->o

  79. */

  80. static const uint8_t svq3_scan[16] = {

  81.     0+0*4, 1+0*4, 2+0*4, 2+1*4,

  82.     2+2*4, 3+0*4, 3+1*4, 3+2*4,

  83.     0+1*4, 0+2*4, 1+1*4, 1+2*4,

  84.     0+3*4, 1+3*4, 2+3*4, 3+3*4,

  85. };

  86. 

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

  88.     { 0, 0 },

  89.     { 1, 0 }, { 0, 1 },

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

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

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

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

  94.     { 2, 4 }, { 3, 3 }, { 4, 2 },

  95.     { 4, 3 }, { 3, 4 },

  96.     { 4, 4 }

  97. };

  98. 

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

  100.     { { 2,-1,-1,-1,-1 }, { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 },

  101.       { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 }, { 1, 2,-1,-1,-1 } },

  102.     { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 4, 3 }, { 0, 1, 2, 4, 3 },

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

  104.     { { 2, 0,-1,-1,-1 }, { 2, 1, 0, 4, 3 }, { 1, 2, 4, 0, 3 },

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

  106.     { { 2, 0,-1,-1,-1 }, { 2, 0, 1, 4, 3 }, { 1, 2, 0, 4, 3 },

  107.       { 2, 1, 0, 4, 3 }, { 2, 1, 3, 4, 0 }, { 2, 4, 1, 0, 3 } },

  108.     { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 3, 4 }, { 1, 2, 3, 0, 4 },

  109.       { 2, 0, 1, 3, 4 }, { 2, 1, 3, 0, 4 }, { 2, 0, 4, 3, 1 } },

  110.     { { 0, 2,-1,-1,-1 }, { 0, 2, 4, 1, 3 }, { 1, 4, 2, 0, 3 },

  111.       { 4, 2, 0, 1, 3 }, { 2, 0, 1, 4, 3 }, { 4, 2, 1, 0, 3 } },

  112. };

  113. 

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

  115.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  116.       { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  117.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  118.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  119. };

  120. 

  121. static const uint32_t svq3_dequant_coeff[32] = {

  122.      3881,  4351,  4890,  5481,  6154,  6914,  7761,  8718,

  123.      9781, 10987, 12339, 13828, 15523, 17435, 19561, 21873,

  124.     24552, 27656, 30847, 34870, 38807, 43747, 49103, 54683,

  125.     61694, 68745, 77615, 89113,100253,109366,126635,141533

  126. };

  127. 

  128. 

  129. void svq3_luma_dc_dequant_idct_c(DCTELEM *block, int qp)

  130. {

  131.     const int qmul = svq3_dequant_coeff[qp];

  132. #define stride 16

  133.     int i;

  134.     int temp[16];

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

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

  137. 

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

  139.         const int offset = y_offset[i];

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

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

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

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

  144. 

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

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

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

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

  149.     }

  150. 

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

  152.         const int offset = x_offset[i];

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

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

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

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

  157. 

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

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

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

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

  162.     }

  163. }

  164. #undef stride

  165. 

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

  167.                             int dc)

  168. {

  169.     const int qmul = svq3_dequant_coeff[qp];

  170.     int i;

  171.     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

  172. 

  173.     if (dc) {

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

  175.         block[0] = 0;

  176.     }

  177. 

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

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

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

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

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

  183. 

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

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

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

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

  188.     }

  189. 

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

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

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

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

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

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

  196. 

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

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

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

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

  201.     }

  202. }

  203. 

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

  205.                                     int index, const int type)

  206. {

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

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

  209. 

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

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

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

  213. 

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

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

  216. 

  217.           if (vlc == INVALID_VLC)

  218.               return -1;

  219. 

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

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

  222. 

  223.           if (type == 3) {

  224.               if (vlc < 3) {

  225.                   run   = 0;

  226.                   level = vlc;

  227.               } else if (vlc < 4) {

  228.                   run   = 1;

  229.                   level = 1;

  230.               } else {

  231.                   run   = (vlc & 0x3);

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

  233.               }

  234.           } else {

  235.               if (vlc < 16) {

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

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

  238.               } else if (intra) {

  239.                   run   = (vlc & 0x7);

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

  241.               } else {

  242.                   run   = (vlc & 0xF);

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

  244.               }

  245.           }

  246. 

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

  248.               return -1;

  249. 

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

  251.         }

  252. 

  253.         if (type != 2) {

  254.             break;

  255.         }

  256.     }

  257. 

  258.     return 0;

  259. }

  260. 

  261. static inline void svq3_mc_dir_part(MpegEncContext *s,

  262.                                     int x, int y, int width, int height,

  263.                                     int mx, int my, int dxy,

  264.                                     int thirdpel, int dir, int avg)

  265. {

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

  267.     uint8_t *src, *dest;

  268.     int i, emu = 0;

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

  270. 

  271.     mx += x;

  272.     my += y;

  273. 

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

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

  276. 

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

  278.             emu = 1;

  279.         }

  280. 

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

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

  283.     }

  284. 

  285.     /* form component predictions */

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

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

  288. 

  289.     if (emu) {

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

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

  292.         src = s->edge_emu_buffer;

  293.     }

  294.     if (thirdpel)

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

  296.     else

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

  298. 

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

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

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

  302.         width  = (width  >> 1);

  303.         height = (height >> 1);

  304.         blocksize++;

  305. 

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

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

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

  309. 

  310.             if (emu) {

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

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

  313.                 src = s->edge_emu_buffer;

  314.             }

  315.             if (thirdpel)

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

  317.             else

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

  319.         }

  320.     }

  321. }

  322. 

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

  324.                               int avg)

  325. {

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

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

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

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

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

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

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

  333. 

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

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

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

  337.             int dxy;

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

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

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

  341. 

  342.             if (mode != PREDICT_MODE) {

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

  344.             } else {

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

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

  347. 

  348.                 if (dir == 0) {

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

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

  351.                 } else {

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

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

  354.                 }

  355.             }

  356. 

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

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

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

  360. 

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

  362.             if (mode == PREDICT_MODE) {

  363.                 dx = dy = 0;

  364.             } else {

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

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

  367. 

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

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

  370.                     return -1;

  371.                 }

  372.             }

  373. 

  374.             /* compute motion vector */

  375.             if (mode == THIRDPEL_MODE) {

  376.                 int fx, fy;

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

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

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

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

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

  382. 

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

  384.                 mx += mx;

  385.                 my += my;

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

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

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

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

  390. 

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

  392.                 mx *= 3;

  393.                 my *= 3;

  394.             } else {

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

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

  397. 

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

  399.                 mx *= 6;

  400.                 my *= 6;

  401.             }

  402. 

  403.             /* update mv_cache */

  404.             if (mode != PREDICT_MODE) {

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

  406. 

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

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

  409. 

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

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

  412.                     }

  413.                 }

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

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

  416.                 }

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

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

  419.                 }

  420.             }

  421. 

  422.             /* write back motion vectors */

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

  424.         }

  425.     }

  426. 

  427.     return 0;

  428. }

  429. 

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

  431. {

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

  433.     int cbp = 0;

  434.     uint32_t vlc;

  435.     int8_t *top, *left;

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

  437.     const int mb_xy = h->mb_xy;

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

  439. 

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

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

  442.     h->topright_samples_available = 0xFFFF;

  443. 

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

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

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

  447. 

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

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

  450.             }

  451. 

  452.             mb_type = MB_TYPE_SKIP;

  453.         } else {

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

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

  456.                 return -1;

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

  458.                 return -1;

  459. 

  460.             mb_type = MB_TYPE_16x16;

  461.         }

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

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

  464.             mode = THIRDPEL_MODE;

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

  466.             mode = HALFPEL_MODE;

  467.         } else {

  468.             mode = FULLPEL_MODE;

  469.         }

  470. 

  471.         /* fill caches */

  472.         /* note ref_cache should contain here:

  473.             ????????

  474.             ???11111

  475.             N??11111

  476.             N??11111

  477.             N??11111

  478.         */

  479. 

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

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

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

  483.                     *(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];

  484.                 }

  485.             } else {

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

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

  488.                 }

  489.             }

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

  491.                 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));

  492.                 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);

  493. 

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

  495.                     *(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];

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

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

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

  499.                 }else

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

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

  502.                     *(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];

  503.                     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;

  504.                 }else

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

  506.             }else

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

  508. 

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

  510.                 break;

  511.         }

  512. 

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

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

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

  516.                 return -1;

  517.         } else {        /* FF_B_TYPE */

  518.             if (mb_type != 2) {

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

  520.                     return -1;

  521.             } else {

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

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

  524.                 }

  525.             }

  526.             if (mb_type != 1) {

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

  528.                     return -1;

  529.             } else {

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

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

  532.                 }

  533.             }

  534.         }

  535. 

  536.         mb_type = MB_TYPE_16x16;

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

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

  539. 

  540.         if (mb_type == 8) {

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

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

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

  544.                 }

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

  546.                     h->left_samples_available = 0x5F5F;

  547.                 }

  548.             }

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

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

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

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

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

  554. 

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

  556.                     h->top_samples_available = 0x33FF;

  557.                 }

  558.             }

  559. 

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

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

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

  563. 

  564.                 if (vlc >= 25){

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

  566.                     return -1;

  567.                 }

  568. 

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

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

  571. 

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

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

  574. 

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

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

  577.                     return -1;

  578.                 }

  579.             }

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

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

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

  583.             }

  584.         }

  585. 

  586.         ff_h264_write_back_intra_pred_mode(h);

  587. 

  588.         if (mb_type == 8) {

  589.             ff_h264_check_intra4x4_pred_mode(h);

  590. 

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

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

  593.         } else {

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

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

  596.             }

  597. 

  598.             h->top_samples_available  = 0x33FF;

  599.             h->left_samples_available = 0x5F5F;

  600.         }

  601. 

  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 = ff_h264_check_intra_pred_mode(h, dir)) == -1){

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

  609.             return -1;

  610.         }

  611. 

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

  613.         mb_type = MB_TYPE_INTRA16x16;

  614.     }

  615. 

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

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

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

  619.         }

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

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

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

  623.             }

  624.         }

  625.     }

  626.     if (!IS_INTRA4x4(mb_type)) {

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

  628.     }

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

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

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

  632.     }

  633. 

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

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

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

  637.             return -1;

  638.         }

  639. 

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

  641.     }

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

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

  644. 

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

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

  647.             return -1;

  648.         }

  649.     }

  650.     if (IS_INTRA16x16(mb_type)) {

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

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

  653.             return -1;

  654.         }

  655.     }

  656. 

  657.     if (cbp) {

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

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

  660. 

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

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

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

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

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

  666. 

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

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

  669.                         return -1;

  670.                     }

  671.                 }

  672.             }

  673.         }

  674. 

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

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

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

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

  679.                 return -1;

  680.               }

  681.             }

  682. 

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

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

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

  686. 

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

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

  689.                         return -1;

  690.                     }

  691.                 }

  692.             }

  693.         }

  694.     }

  695. 

  696.     h->cbp= cbp;

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

  698. 

  699.     if (IS_INTRA(mb_type)) {

  700.         h->chroma_pred_mode = ff_h264_check_intra_pred_mode(h, DC_PRED8x8);

  701.     }

  702. 

  703.     return 0;

  704. }

  705. 

  706. static int svq3_decode_slice_header(H264Context *h)

  707. {

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

  709.     const int mb_xy = h->mb_xy;

  710.     int i, header;

  711. 

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

  713. 

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

  715.         /* TODO: what? */

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

  717.         return -1;

  718.     } else {

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

  720. 

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

  722. 

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

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

  725.             return -1;

  726.     }

  727. 

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

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

  730. 

  731.         if (h->svq3_watermark_key) {

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

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

  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.         skip_bits_long(&s->gb, 0);

  740.     }

  741. 

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

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

  744.         return -1;

  745.     }

  746. 

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

  748. 

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

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

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

  752.     } else {

  753.         skip_bits1(&s->gb);

  754.         s->mb_skip_run = 0;

  755.     }

  756. 

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

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

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

  760. 

  761.     /* unknown fields */

  762.     skip_bits1(&s->gb);

  763. 

  764.     if (h->unknown_svq3_flag) {

  765.         skip_bits1(&s->gb);

  766.     }

  767. 

  768.     skip_bits1(&s->gb);

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

  770. 

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

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

  773.     }

  774. 

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

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

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

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

  779.     }

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

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

  782. 

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

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

  785.         }

  786.     }

  787. 

  788.     return 0;

  789. }

  790. 

  791. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  792. {

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

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

  795.     int m;

  796.     unsigned char *extradata;

  797.     unsigned int size;

  798. 

  799.     if(avctx->thread_count > 1){

  800.         av_log(avctx, AV_LOG_ERROR, "SVQ3 does not support multithreaded decoding, patch welcome! (check latest SVN too)\n");

  801.         return -1;

  802.     }

  803. 

  804.     if (ff_h264_decode_init(avctx) < 0)

  805.         return -1;

  806. 

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

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

  809.     s->unrestricted_mv = 1;

  810.     h->is_complex=1;

  811.     avctx->pix_fmt = avctx->codec->pix_fmts[0];

  812. 

  813.     if (!s->context_initialized) {

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

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

  816.         h->halfpel_flag      = 1;

  817.         h->thirdpel_flag     = 1;

  818.         h->unknown_svq3_flag = 0;

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

  820. 

  821.         if (MPV_common_init(s) < 0)

  822.             return -1;

  823. 

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

  825. 

  826.         ff_h264_alloc_tables(h);

  827. 

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

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

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

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

  832.                 break;

  833.             extradata++;

  834.         }

  835. 

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

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

  838. 

  839.             GetBitContext gb;

  840.             int frame_size_code;

  841. 

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

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

  844. 

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

  846.             frame_size_code = get_bits(&gb, 3);

  847.             switch (frame_size_code) {

  848.                 case 0: avctx->width = 160; avctx->height = 120; break;

  849.                 case 1: avctx->width = 128; avctx->height =  96; break;

  850.                 case 2: avctx->width = 176; avctx->height = 144; break;

  851.                 case 3: avctx->width = 352; avctx->height = 288; break;

  852.                 case 4: avctx->width = 704; avctx->height = 576; break;

  853.                 case 5: avctx->width = 240; avctx->height = 180; break;

  854.                 case 6: avctx->width = 320; avctx->height = 240; break;

  855.                 case 7:

  856.                     avctx->width  = get_bits(&gb, 12);

  857.                     avctx->height = get_bits(&gb, 12);

  858.                     break;

  859.             }

  860. 

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

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

  863. 

  864.             /* unknown fields */

  865.             skip_bits1(&gb);

  866.             skip_bits1(&gb);

  867.             skip_bits1(&gb);

  868.             skip_bits1(&gb);

  869. 

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

  871. 

  872.             /* unknown field */

  873.             skip_bits1(&gb);

  874. 

  875.             while (get_bits1(&gb)) {

  876.                 skip_bits(&gb, 8);

  877.             }

  878. 

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

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

  881.             if (h->unknown_svq3_flag) {

  882. #if CONFIG_ZLIB

  883.                 unsigned watermark_width  = svq3_get_ue_golomb(&gb);

  884.                 unsigned watermark_height = svq3_get_ue_golomb(&gb);

  885.                 int u1 = svq3_get_ue_golomb(&gb);

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

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

  888.                 int u4 = svq3_get_ue_golomb(&gb);

  889.                 unsigned buf_len = watermark_width*watermark_height*4;

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

  891.                 uint8_t *buf;

  892. 

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

  894.                     return -1;

  895. 

  896.                 buf = av_malloc(buf_len);

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

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

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

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

  901.                     av_free(buf);

  902.                     return -1;

  903.                 }

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

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

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

  907.                 av_free(buf);

  908. #else

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

  910.                 return -1;

  911. #endif

  912.             }

  913.         }

  914.     }

  915. 

  916.     return 0;

  917. }

  918. 

  919. static int svq3_decode_frame(AVCodecContext *avctx,

  920.                              void *data, int *data_size,

  921.                              AVPacket *avpkt)

  922. {

  923.     const uint8_t *buf = avpkt->data;

  924.     int buf_size = avpkt->size;

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

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

  927.     int m, mb_type;

  928. 

  929.     /* special case for last picture */

  930.     if (buf_size == 0) {

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

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

  933.             s->next_picture_ptr = NULL;

  934.             *data_size = sizeof(AVFrame);

  935.         }

  936.         return 0;

  937.     }

  938. 

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

  940. 

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

  942. 

  943.     if (svq3_decode_slice_header(h))

  944.         return -1;

  945. 

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

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

  948. 

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

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

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

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

  953.     }

  954. 

  955.     /* for hurry_up == 5 */

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

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

  958. 

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

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

  961.         return 0;

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

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

  964.         return 0;

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

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

  967.         return 0;

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

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

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

  971.         return 0;

  972. 

  973.     if (s->next_p_frame_damaged) {

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

  975.             return 0;

  976.         else

  977.             s->next_p_frame_damaged = 0;

  978.     }

  979. 

  980.     if (ff_h264_frame_start(h) < 0)

  981.         return -1;

  982. 

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

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

  985. 

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

  987.             h->frame_num_offset += 256;

  988.         }

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

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

  991.             return -1;

  992.         }

  993.     } else {

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

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

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

  997. 

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

  999.             h->prev_frame_num_offset += 256;

  1000.         }

  1001.     }

  1002. 

  1003.     for (m = 0; m < 2; m++){

  1004.         int i;

  1005.         for (i = 0; i < 4; i++){

  1006.             int j;

  1007.             for (j = -1; j < 4; j++)

  1008.                 h->ref_cache[m][scan8[0] + 8*i + j]= 1;

  1009.             if (i < 3)

  1010.                 h->ref_cache[m][scan8[0] + 8*i + j]= PART_NOT_AVAILABLE;

  1011.         }

  1012.     }

  1013. 

  1014.     for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  1015.         for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  1016.             h->mb_xy = s->mb_x + s->mb_y*s->mb_stride;

  1017. 

  1018.             if ( (get_bits_count(&s->gb) + 7) >= s->gb.size_in_bits &&

  1019.                 ((get_bits_count(&s->gb) & 7) == 0 || show_bits(&s->gb, (-get_bits_count(&s->gb) & 7)) == 0)) {

  1020. 

  1021.                 skip_bits(&s->gb, h->next_slice_index - get_bits_count(&s->gb));

  1022.                 s->gb.size_in_bits = 8*buf_size;

  1023. 

  1024.                 if (svq3_decode_slice_header(h))

  1025.                     return -1;

  1026. 

  1027.                 /* TODO: support s->mb_skip_run */

  1028.             }

  1029. 

  1030.             mb_type = svq3_get_ue_golomb(&s->gb);

  1031. 

  1032.             if (s->pict_type == FF_I_TYPE) {

  1033.                 mb_type += 8;

  1034.             } else if (s->pict_type == FF_B_TYPE && mb_type >= 4) {

  1035.                 mb_type += 4;

  1036.             }

  1037.             if (mb_type > 33 || svq3_decode_mb(h, mb_type)) {

  1038.                 av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1039.                 return -1;

  1040.             }

  1041. 

  1042.             if (mb_type != 0) {

  1043.                 ff_h264_hl_decode_mb (h);

  1044.             }

  1045. 

  1046.             if (s->pict_type != FF_B_TYPE && !s->low_delay) {

  1047.                 s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =

  1048.                     (s->pict_type == FF_P_TYPE && mb_type < 8) ? (mb_type - 1) : -1;

  1049.             }

  1050.         }

  1051. 

  1052.         ff_draw_horiz_band(s, 16*s->mb_y, 16);

  1053.     }

  1054. 

  1055.     MPV_frame_end(s);

  1056. 

  1057.     if (s->pict_type == FF_B_TYPE || s->low_delay) {

  1058.         *(AVFrame *) data = *(AVFrame *) &s->current_picture;

  1059.     } else {

  1060.         *(AVFrame *) data = *(AVFrame *) &s->last_picture;

  1061.     }

  1062. 

  1063.     /* Do not output the last pic after seeking. */

  1064.     if (s->last_picture_ptr || s->low_delay) {

  1065.         *data_size = sizeof(AVFrame);

  1066.     }

  1067. 

  1068.     return buf_size;

  1069. }

  1070. 

  1071. 

  1072. AVCodec svq3_decoder = {

  1073.     "svq3",

  1074.     CODEC_TYPE_VIDEO,

  1075.     CODEC_ID_SVQ3,

  1076.     sizeof(H264Context),

  1077.     svq3_decode_init,

  1078.     NULL,

  1079.     ff_h264_decode_end,

  1080.     svq3_decode_frame,

  1081.     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1082.     .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1083.     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_NONE},

  1084. };