falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
22190 Commits
32 Branches
959MB
Tree: bdd19e29df
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'bdd19e29df'
${ noResults }
FFmpeg/libavcodec/svq3.c

1089 lines
39KB
Raw Blame History 

  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 ARCH_X86

  56. #include "x86/h264_i386.h"

  57. #endif

  58. 

  59. #if CONFIG_ZLIB

  60. #include <zlib.h>

  61. #endif

  62. 

  63. #include "svq1.h"

  64. 

  65. /**

  66.  * @file libavcodec/svq3.c

  67.  * svq3 decoder.

  68.  */

  69. 

  70. #define FULLPEL_MODE  1

  71. #define HALFPEL_MODE  2

  72. #define THIRDPEL_MODE 3

  73. #define PREDICT_MODE  4

  74. 

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

  76.  o-->o-->o   o

  77.          |  /|

  78.  o   o   o / o

  79.  | / |   |/  |

  80.  o   o   o   o

  81.    /

  82.  o-->o-->o-->o

  83. */

  84. static const uint8_t svq3_scan[16] = {

  85.     0+0*4, 1+0*4, 2+0*4, 2+1*4,

  86.     2+2*4, 3+0*4, 3+1*4, 3+2*4,

  87.     0+1*4, 0+2*4, 1+1*4, 1+2*4,

  88.     0+3*4, 1+3*4, 2+3*4, 3+3*4,

  89. };

  90. 

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

  92.     { 0, 0 },

  93.     { 1, 0 }, { 0, 1 },

  94.     { 0, 2 }, { 1, 1 }, { 2, 0 },

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

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

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

  98.     { 2, 4 }, { 3, 3 }, { 4, 2 },

  99.     { 4, 3 }, { 3, 4 },

  100.     { 4, 4 }

  101. };

  102. 

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

  104.     { { 2,-1,-1,-1,-1 }, { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 },

  105.       { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 }, { 1, 2,-1,-1,-1 } },

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

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

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

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

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

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

  112.     { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 3, 4 }, { 1, 2, 3, 0, 4 },

  113.       { 2, 0, 1, 3, 4 }, { 2, 1, 3, 0, 4 }, { 2, 0, 4, 3, 1 } },

  114.     { { 0, 2,-1,-1,-1 }, { 0, 2, 4, 1, 3 }, { 1, 4, 2, 0, 3 },

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

  116. };

  117. 

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

  119.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  120.       { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  121.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  122.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  123. };

  124. 

  125. static const uint32_t svq3_dequant_coeff[32] = {

  126.      3881,  4351,  4890,  5481,  6154,  6914,  7761,  8718,

  127.      9781, 10987, 12339, 13828, 15523, 17435, 19561, 21873,

  128.     24552, 27656, 30847, 34870, 38807, 43747, 49103, 54683,

  129.     61694, 68745, 77615, 89113,100253,109366,126635,141533

  130. };

  131. 

  132. 

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

  134. {

  135.     const int qmul = svq3_dequant_coeff[qp];

  136. #define stride 16

  137.     int i;

  138.     int temp[16];

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

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

  141. 

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

  143.         const int offset = y_offset[i];

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

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

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

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

  148. 

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

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

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

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

  153.     }

  154. 

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

  156.         const int offset = x_offset[i];

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

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

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

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

  161. 

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

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

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

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

  166.     }

  167. }

  168. #undef stride

  169. 

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

  171.                             int dc)

  172. {

  173.     const int qmul = svq3_dequant_coeff[qp];

  174.     int i;

  175.     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

  176. 

  177.     if (dc) {

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

  179.         block[0] = 0;

  180.     }

  181. 

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

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

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

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

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

  187. 

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

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

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

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

  192.     }

  193. 

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

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

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

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

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

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

  200. 

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

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

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

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

  205.     }

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

  286.         my = av_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 inline int svq3_mc_dir(H264Context *h, int size, int mode, int dir,

  328.                               int avg)

  329. {

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

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

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

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

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

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

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

  337. 

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

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

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

  341.             int dxy;

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

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

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

  345. 

  346.             if (mode != PREDICT_MODE) {

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

  348.             } else {

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

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

  351. 

  352.                 if (dir == 0) {

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

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

  355.                 } else {

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

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

  358.                 }

  359.             }

  360. 

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

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

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

  364. 

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

  366.             if (mode == PREDICT_MODE) {

  367.                 dx = dy = 0;

  368.             } else {

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

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

  371. 

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

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

  374.                     return -1;

  375.                 }

  376.             }

  377. 

  378.             /* compute motion vector */

  379.             if (mode == THIRDPEL_MODE) {

  380.                 int fx, fy;

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

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

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

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

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

  386. 

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

  388.                 mx += mx;

  389.                 my += my;

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

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

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

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

  394. 

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

  396.                 mx *= 3;

  397.                 my *= 3;

  398.             } else {

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

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

  401. 

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

  403.                 mx *= 6;

  404.                 my *= 6;

  405.             }

  406. 

  407.             /* update mv_cache */

  408.             if (mode != PREDICT_MODE) {

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

  410. 

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

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

  413. 

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

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

  416.                     }

  417.                 }

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

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

  420.                 }

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

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

  423.                 }

  424.             }

  425. 

  426.             /* write back motion vectors */

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

  428.         }

  429.     }

  430. 

  431.     return 0;

  432. }

  433. 

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

  435. {

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

  437.     int cbp = 0;

  438.     uint32_t vlc;

  439.     int8_t *top, *left;

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

  441.     const int mb_xy = h->mb_xy;

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

  443. 

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

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

  446.     h->topright_samples_available = 0xFFFF;

  447. 

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

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

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

  451. 

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

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

  454.             }

  455. 

  456.             mb_type = MB_TYPE_SKIP;

  457.         } else {

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

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

  460.                 return -1;

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

  462.                 return -1;

  463. 

  464.             mb_type = MB_TYPE_16x16;

  465.         }

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

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

  468.             mode = THIRDPEL_MODE;

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

  470.             mode = HALFPEL_MODE;

  471.         } else {

  472.             mode = FULLPEL_MODE;

  473.         }

  474. 

  475.         /* fill caches */

  476.         /* note ref_cache should contain here:

  477.             ????????

  478.             ???11111

  479.             N??11111

  480.             N??11111

  481.             N??11111

  482.         */

  483. 

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

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

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

  487.                     *(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];

  488.                 }

  489.             } else {

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

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

  492.                 }

  493.             }

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

  495.                 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));

  496.                 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);

  497. 

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

  499.                     *(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];

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

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

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

  503.                 }else

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

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

  506.                     *(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];

  507.                     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;

  508.                 }else

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

  510.             }else

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

  512. 

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

  514.                 break;

  515.         }

  516. 

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

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

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

  520.                 return -1;

  521.         } else {        /* FF_B_TYPE */

  522.             if (mb_type != 2) {

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

  524.                     return -1;

  525.             } else {

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

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

  528.                 }

  529.             }

  530.             if (mb_type != 1) {

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

  532.                     return -1;

  533.             } else {

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

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

  536.                 }

  537.             }

  538.         }

  539. 

  540.         mb_type = MB_TYPE_16x16;

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

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

  543. 

  544.         if (mb_type == 8) {

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

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

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

  548.                 }

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

  550.                     h->left_samples_available = 0x5F5F;

  551.                 }

  552.             }

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

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

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

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

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

  558. 

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

  560.                     h->top_samples_available = 0x33FF;

  561.                 }

  562.             }

  563. 

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

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

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

  567. 

  568.                 if (vlc >= 25){

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

  570.                     return -1;

  571.                 }

  572. 

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

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

  575. 

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

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

  578. 

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

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

  581.                     return -1;

  582.                 }

  583.             }

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

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

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

  587.             }

  588.         }

  589. 

  590.         ff_h264_write_back_intra_pred_mode(h);

  591. 

  592.         if (mb_type == 8) {

  593.             ff_h264_check_intra4x4_pred_mode(h);

  594. 

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

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

  597.         } else {

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

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

  600.             }

  601. 

  602.             h->top_samples_available  = 0x33FF;

  603.             h->left_samples_available = 0x5F5F;

  604.         }

  605. 

  606.         mb_type = MB_TYPE_INTRA4x4;

  607.     } else {                      /* INTRA16x16 */

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

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

  610. 

  611.         if ((h->intra16x16_pred_mode = ff_h264_check_intra_pred_mode(h, dir)) == -1){

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

  613.             return -1;

  614.         }

  615. 

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

  617.         mb_type = MB_TYPE_INTRA16x16;

  618.     }

  619. 

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

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

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

  623.         }

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

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

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

  627.             }

  628.         }

  629.     }

  630.     if (!IS_INTRA4x4(mb_type)) {

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

  632.     }

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

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

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

  636.     }

  637. 

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

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

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

  641.             return -1;

  642.         }

  643. 

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

  645.     }

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

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

  648. 

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

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

  651.             return -1;

  652.         }

  653.     }

  654.     if (IS_INTRA16x16(mb_type)) {

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

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

  657.             return -1;

  658.         }

  659.     }

  660. 

  661.     if (cbp) {

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

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

  664. 

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

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

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

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

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

  670. 

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

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

  673.                         return -1;

  674.                     }

  675.                 }

  676.             }

  677.         }

  678. 

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

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

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

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

  683.                 return -1;

  684.               }

  685.             }

  686. 

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

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

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

  690. 

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

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

  693.                         return -1;

  694.                     }

  695.                 }

  696.             }

  697.         }

  698.     }

  699. 

  700.     h->cbp= cbp;

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

  702. 

  703.     if (IS_INTRA(mb_type)) {

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

  705.     }

  706. 

  707.     return 0;

  708. }

  709. 

  710. static int svq3_decode_slice_header(H264Context *h)

  711. {

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

  713.     const int mb_xy = h->mb_xy;

  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 (h->svq3_watermark_key) {

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

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

  738.         }

  739.         if (length > 0) {

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

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

  742.         }

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

  744.     }

  745. 

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

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

  748.         return -1;

  749.     }

  750. 

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

  752. 

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

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

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

  756.     } else {

  757.         skip_bits1(&s->gb);

  758.         s->mb_skip_run = 0;

  759.     }

  760. 

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

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

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

  764. 

  765.     /* unknown fields */

  766.     skip_bits1(&s->gb);

  767. 

  768.     if (h->unknown_svq3_flag) {

  769.         skip_bits1(&s->gb);

  770.     }

  771. 

  772.     skip_bits1(&s->gb);

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

  774. 

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

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

  777.     }

  778. 

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

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

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

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

  783.     }

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

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

  786. 

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

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

  789.         }

  790.     }

  791. 

  792.     return 0;

  793. }

  794. 

  795. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  796. {

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

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

  799.     int m;

  800.     unsigned char *extradata;

  801.     unsigned int size;

  802. 

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

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

  805.         return -1;

  806.     }

  807. 

  808.     if (ff_h264_decode_init(avctx) < 0)

  809.         return -1;

  810. 

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

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

  813.     s->unrestricted_mv = 1;

  814.     h->is_complex=1;

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

  816. 

  817.     if (!s->context_initialized) {

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

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

  820.         h->halfpel_flag      = 1;

  821.         h->thirdpel_flag     = 1;

  822.         h->unknown_svq3_flag = 0;

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

  824. 

  825.         if (MPV_common_init(s) < 0)

  826.             return -1;

  827. 

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

  829. 

  830.         ff_h264_alloc_tables(h);

  831. 

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

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

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

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

  836.                 break;

  837.             extradata++;

  838.         }

  839. 

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

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

  842. 

  843.             GetBitContext gb;

  844.             int frame_size_code;

  845. 

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

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

  848. 

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

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

  851.             switch (frame_size_code) {

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

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

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

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

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

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

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

  859.                 case 7:

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

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

  862.                     break;

  863.             }

  864. 

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

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

  867. 

  868.             /* unknown fields */

  869.             skip_bits1(&gb);

  870.             skip_bits1(&gb);

  871.             skip_bits1(&gb);

  872.             skip_bits1(&gb);

  873. 

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

  875. 

  876.             /* unknown field */

  877.             skip_bits1(&gb);

  878. 

  879.             while (get_bits1(&gb)) {

  880.                 skip_bits(&gb, 8);

  881.             }

  882. 

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

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

  885.             if (h->unknown_svq3_flag) {

  886. #if CONFIG_ZLIB

  887.                 unsigned watermark_width  = svq3_get_ue_golomb(&gb);

  888.                 unsigned watermark_height = svq3_get_ue_golomb(&gb);

  889.                 int u1 = svq3_get_ue_golomb(&gb);

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

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

  892.                 int u4 = svq3_get_ue_golomb(&gb);

  893.                 unsigned buf_len = watermark_width*watermark_height*4;

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

  895.                 uint8_t *buf;

  896. 

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

  898.                     return -1;

  899. 

  900.                 buf = av_malloc(buf_len);

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

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

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

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

  905.                     av_free(buf);

  906.                     return -1;

  907.                 }

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

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

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

  911.                 av_free(buf);

  912. #else

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

  914.                 return -1;

  915. #endif

  916.             }

  917.         }

  918.     }

  919. 

  920.     return 0;

  921. }

  922. 

  923. static int svq3_decode_frame(AVCodecContext *avctx,

  924.                              void *data, int *data_size,

  925.                              AVPacket *avpkt)

  926. {

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

  928.     int buf_size = avpkt->size;

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

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

  931.     int m, mb_type;

  932. 

  933.     /* special case for last picture */

  934.     if (buf_size == 0) {

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

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

  937.             s->next_picture_ptr = NULL;

  938.             *data_size = sizeof(AVFrame);

  939.         }

  940.         return 0;

  941.     }

  942. 

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

  944. 

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

  946. 

  947.     if (svq3_decode_slice_header(h))

  948.         return -1;

  949. 

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

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

  952. 

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

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

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

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

  957.     }

  958. 

  959.     /* for hurry_up == 5 */

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

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

  962. 

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

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

  965.         return 0;

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

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

  968.         return 0;

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

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

  971.         return 0;

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

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

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

  975.         return 0;

  976. 

  977.     if (s->next_p_frame_damaged) {

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

  979.             return 0;

  980.         else

  981.             s->next_p_frame_damaged = 0;

  982.     }

  983. 

  984.     if (ff_h264_frame_start(h) < 0)

  985.         return -1;

  986. 

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

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

  989. 

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

  991.             h->frame_num_offset += 256;

  992.         }

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

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

  995.             return -1;

  996.         }

  997.     } else {

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

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

  1000.         h->prev_frame_num_offset = (h->frame_num - h->prev_frame_num);

  1001. 

  1002.         if (h->prev_frame_num_offset < 0) {

  1003.             h->prev_frame_num_offset += 256;

  1004.         }

  1005.     }

  1006. 

  1007.     for (m = 0; m < 2; m++){

  1008.         int i;

  1009.         for (i = 0; i < 4; i++){

  1010.             int j;

  1011.             for (j = -1; j < 4; j++)

  1012.                 h->ref_cache[m][scan8[0] + 8*i + j]= 1;

  1013.             if (i < 3)

  1014.                 h->ref_cache[m][scan8[0] + 8*i + j]= PART_NOT_AVAILABLE;

  1015.         }

  1016.     }

  1017. 

  1018.     for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  1019.         for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  1020.             h->mb_xy = s->mb_x + s->mb_y*s->mb_stride;

  1021. 

  1022.             if ( (get_bits_count(&s->gb) + 7) >= s->gb.size_in_bits &&

  1023.                 ((get_bits_count(&s->gb) & 7) == 0 || show_bits(&s->gb, (-get_bits_count(&s->gb) & 7)) == 0)) {

  1024. 

  1025.                 skip_bits(&s->gb, h->next_slice_index - get_bits_count(&s->gb));

  1026.                 s->gb.size_in_bits = 8*buf_size;

  1027. 

  1028.                 if (svq3_decode_slice_header(h))

  1029.                     return -1;

  1030. 

  1031.                 /* TODO: support s->mb_skip_run */

  1032.             }

  1033. 

  1034.             mb_type = svq3_get_ue_golomb(&s->gb);

  1035. 

  1036.             if (s->pict_type == FF_I_TYPE) {

  1037.                 mb_type += 8;

  1038.             } else if (s->pict_type == FF_B_TYPE && mb_type >= 4) {

  1039.                 mb_type += 4;

  1040.             }

  1041.             if (mb_type > 33 || svq3_decode_mb(h, mb_type)) {

  1042.                 av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1043.                 return -1;

  1044.             }

  1045. 

  1046.             if (mb_type != 0) {

  1047.                 ff_h264_hl_decode_mb (h);

  1048.             }

  1049. 

  1050.             if (s->pict_type != FF_B_TYPE && !s->low_delay) {

  1051.                 s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =

  1052.                     (s->pict_type == FF_P_TYPE && mb_type < 8) ? (mb_type - 1) : -1;

  1053.             }

  1054.         }

  1055. 

  1056.         ff_draw_horiz_band(s, 16*s->mb_y, 16);

  1057.     }

  1058. 

  1059.     MPV_frame_end(s);

  1060. 

  1061.     if (s->pict_type == FF_B_TYPE || s->low_delay) {

  1062.         *(AVFrame *) data = *(AVFrame *) &s->current_picture;

  1063.     } else {

  1064.         *(AVFrame *) data = *(AVFrame *) &s->last_picture;

  1065.     }

  1066. 

  1067.     /* Do not output the last pic after seeking. */

  1068.     if (s->last_picture_ptr || s->low_delay) {

  1069.         *data_size = sizeof(AVFrame);

  1070.     }

  1071. 

  1072.     return buf_size;

  1073. }

  1074. 

  1075. 

  1076. AVCodec svq3_decoder = {

  1077.     "svq3",

  1078.     CODEC_TYPE_VIDEO,

  1079.     CODEC_ID_SVQ3,

  1080.     sizeof(H264Context),

  1081.     svq3_decode_init,

  1082.     NULL,

  1083.     ff_h264_decode_end,

  1084.     svq3_decode_frame,

  1085.     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1086.     .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1087.     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_NONE},

  1088. };