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FFmpeg/libavcodec/svq3.c

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  1. /*

  2.  * Copyright (c) 2003 The Libav Project

  3.  *

  4.  * This file is part of Libav.

  5.  *

  6.  * Libav 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.  * Libav 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 Libav; 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.libav.org/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

  63.  * svq3 decoder.

  64.  */

  65. 

  66. typedef struct {

  67.     H264Context h;

  68.     int halfpel_flag;

  69.     int thirdpel_flag;

  70.     int unknown_flag;

  71.     int next_slice_index;

  72.     uint32_t watermark_key;

  73. } SVQ3Context;

  74. 

  75. #define FULLPEL_MODE  1

  76. #define HALFPEL_MODE  2

  77. #define THIRDPEL_MODE 3

  78. #define PREDICT_MODE  4

  79. 

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

  81.  o-->o-->o   o

  82.          |  /|

  83.  o   o   o / o

  84.  | / |   |/  |

  85.  o   o   o   o

  86.    /

  87.  o-->o-->o-->o

  88. */

  89. static const uint8_t svq3_scan[16] = {

  90.     0+0*4, 1+0*4, 2+0*4, 2+1*4,

  91.     2+2*4, 3+0*4, 3+1*4, 3+2*4,

  92.     0+1*4, 0+2*4, 1+1*4, 1+2*4,

  93.     0+3*4, 1+3*4, 2+3*4, 3+3*4,

  94. };

  95. 

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

  97.     { 0, 0 },

  98.     { 1, 0 }, { 0, 1 },

  99.     { 0, 2 }, { 1, 1 }, { 2, 0 },

  100.     { 3, 0 }, { 2, 1 }, { 1, 2 }, { 0, 3 },

  101.     { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

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

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

  104.     { 4, 3 }, { 3, 4 },

  105.     { 4, 4 }

  106. };

  107. 

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

  109.     { { 2,-1,-1,-1,-1 }, { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 },

  110.       { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 }, { 1, 2,-1,-1,-1 } },

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

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

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

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

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

  116.       { 2, 1, 0, 4, 3 }, { 2, 1, 3, 4, 0 }, { 2, 4, 1, 0, 3 } },

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

  118.       { 2, 0, 1, 3, 4 }, { 2, 1, 3, 0, 4 }, { 2, 0, 4, 3, 1 } },

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

  120.       { 4, 2, 0, 1, 3 }, { 2, 0, 1, 4, 3 }, { 4, 2, 1, 0, 3 } },

  121. };

  122. 

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

  124.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  125.       { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  126.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  127.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  128. };

  129. 

  130. static const uint32_t svq3_dequant_coeff[32] = {

  131.      3881,  4351,  4890,  5481,  6154,  6914,  7761,  8718,

  132.      9781, 10987, 12339, 13828, 15523, 17435, 19561, 21873,

  133.     24552, 27656, 30847, 34870, 38807, 43747, 49103, 54683,

  134.     61694, 68745, 77615, 89113,100253,109366,126635,141533

  135. };

  136. 

  137. void ff_svq3_luma_dc_dequant_idct_c(DCTELEM *output, DCTELEM *input, int qp){

  138.     const int qmul = svq3_dequant_coeff[qp];

  139. #define stride 16

  140.     int i;

  141.     int temp[16];

  142.     static const uint8_t x_offset[4]={0, 1*stride, 4*stride, 5*stride};

  143. 

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

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

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

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

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

  149. 

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

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

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

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

  154.     }

  155. 

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

  157.         const int offset= x_offset[i];

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

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

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

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

  162. 

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

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

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

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

  167.     }

  168. }

  169. #undef stride

  170. 

  171. void ff_svq3_add_idct_c(uint8_t *dst, DCTELEM *block, int stride, int qp,

  172.                             int dc)

  173. {

  174.     const int qmul = svq3_dequant_coeff[qp];

  175.     int i;

  176.     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

  177. 

  178.     if (dc) {

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

  180.         block[0] = 0;

  181.     }

  182. 

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

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

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

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

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

  188. 

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

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

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

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

  193.     }

  194. 

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

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

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

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

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

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

  201. 

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

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

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

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

  206.     }

  207. }

  208. 

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

  210.                                     int index, const int type)

  211. {

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

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

  214. 

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

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

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

  218. 

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

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

  221. 

  222.           if (vlc == INVALID_VLC)

  223.               return -1;

  224. 

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

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

  227. 

  228.           if (type == 3) {

  229.               if (vlc < 3) {

  230.                   run   = 0;

  231.                   level = vlc;

  232.               } else if (vlc < 4) {

  233.                   run   = 1;

  234.                   level = 1;

  235.               } else {

  236.                   run   = (vlc & 0x3);

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

  238.               }

  239.           } else {

  240.               if (vlc < 16) {

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

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

  243.               } else if (intra) {

  244.                   run   = (vlc & 0x7);

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

  246.               } else {

  247.                   run   = (vlc & 0xF);

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

  249.               }

  250.           }

  251. 

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

  253.               return -1;

  254. 

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

  256.         }

  257. 

  258.         if (type != 2) {

  259.             break;

  260.         }

  261.     }

  262. 

  263.     return 0;

  264. }

  265. 

  266. static inline void svq3_mc_dir_part(MpegEncContext *s,

  267.                                     int x, int y, int width, int height,

  268.                                     int mx, int my, int dxy,

  269.                                     int thirdpel, int dir, int avg)

  270. {

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

  272.     uint8_t *src, *dest;

  273.     int i, emu = 0;

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

  275. 

  276.     mx += x;

  277.     my += y;

  278. 

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

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

  281. 

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

  283.             emu = 1;

  284.         }

  285. 

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

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

  288.     }

  289. 

  290.     /* form component predictions */

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

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

  293. 

  294.     if (emu) {

  295.         s->dsp.emulated_edge_mc(s->edge_emu_buffer, src, s->linesize, (width + 1), (height + 1),

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

  297.         src = s->edge_emu_buffer;

  298.     }

  299.     if (thirdpel)

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

  301.     else

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

  303. 

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

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

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

  307.         width  = (width  >> 1);

  308.         height = (height >> 1);

  309.         blocksize++;

  310. 

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

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

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

  314. 

  315.             if (emu) {

  316.                 s->dsp.emulated_edge_mc(s->edge_emu_buffer, src, s->uvlinesize, (width + 1), (height + 1),

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

  318.                 src = s->edge_emu_buffer;

  319.             }

  320.             if (thirdpel)

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

  322.             else

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

  324.         }

  325.     }

  326. }

  327. 

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

  329.                               int avg)

  330. {

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

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

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

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

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

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

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

  338. 

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

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

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

  342.             int dxy;

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

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

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

  346. 

  347.             if (mode != PREDICT_MODE) {

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

  349.             } else {

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

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

  352. 

  353.                 if (dir == 0) {

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

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

  356.                 } else {

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

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

  359.                 }

  360.             }

  361. 

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

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

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

  365. 

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

  367.             if (mode == PREDICT_MODE) {

  368.                 dx = dy = 0;

  369.             } else {

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

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

  372. 

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

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

  375.                     return -1;

  376.                 }

  377.             }

  378. 

  379.             /* compute motion vector */

  380.             if (mode == THIRDPEL_MODE) {

  381.                 int fx, fy;

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

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

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

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

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

  387. 

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

  389.                 mx += mx;

  390.                 my += my;

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

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

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

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

  395. 

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

  397.                 mx *= 3;

  398.                 my *= 3;

  399.             } else {

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

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

  402. 

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

  404.                 mx *= 6;

  405.                 my *= 6;

  406.             }

  407. 

  408.             /* update mv_cache */

  409.             if (mode != PREDICT_MODE) {

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

  411. 

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

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

  414. 

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

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

  417.                     }

  418.                 }

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

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

  421.                 }

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

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

  424.                 }

  425.             }

  426. 

  427.             /* write back motion vectors */

  428.             fill_rectangle(s->current_picture.f.motion_val[dir][b_xy],

  429.                            part_width >> 2, part_height >> 2, h->b_stride,

  430.                            pack16to32(mx, my), 4);

  431.         }

  432.     }

  433. 

  434.     return 0;

  435. }

  436. 

  437. static int svq3_decode_mb(SVQ3Context *svq3, unsigned int mb_type)

  438. {

  439.     H264Context *h = &svq3->h;

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

  441.     int cbp = 0;

  442.     uint32_t vlc;

  443.     int8_t *top, *left;

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

  445.     const int mb_xy = h->mb_xy;

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

  447. 

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

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

  450.     h->topright_samples_available = 0xFFFF;

  451. 

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

  453.         if (s->pict_type == AV_PICTURE_TYPE_P || s->next_picture.f.mb_type[mb_xy] == -1) {

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

  455. 

  456.             if (s->pict_type == AV_PICTURE_TYPE_B) {

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

  458.             }

  459. 

  460.             mb_type = MB_TYPE_SKIP;

  461.         } else {

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

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

  464.                 return -1;

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

  466.                 return -1;

  467. 

  468.             mb_type = MB_TYPE_16x16;

  469.         }

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

  471.         if (svq3->thirdpel_flag && svq3->halfpel_flag == !get_bits1 (&s->gb)) {

  472.             mode = THIRDPEL_MODE;

  473.         } else if (svq3->halfpel_flag && svq3->thirdpel_flag == !get_bits1 (&s->gb)) {

  474.             mode = HALFPEL_MODE;

  475.         } else {

  476.             mode = FULLPEL_MODE;

  477.         }

  478. 

  479.         /* fill caches */

  480.         /* note ref_cache should contain here:

  481.             ????????

  482.             ???11111

  483.             N??11111

  484.             N??11111

  485.             N??11111

  486.         */

  487. 

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

  489.             if (s->mb_x > 0 && h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - 1]+6] != -1) {

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

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

  492.                 }

  493.             } else {

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

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

  496.                 }

  497.             }

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

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

  500.                 memset(&h->ref_cache[m][scan8[0] - 1*8], (h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride]] == -1) ? PART_NOT_AVAILABLE : 1, 4);

  501. 

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

  503.                     *(uint32_t *) h->mv_cache[m][scan8[0] + 4 - 1*8] = *(uint32_t *) s->current_picture.f.motion_val[m][b_xy - h->b_stride + 4];

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

  505.                         (h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride + 1]+6] == -1 ||

  506.                          h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride    ]  ] == -1) ? PART_NOT_AVAILABLE : 1;

  507.                 }else

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

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

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

  511.                     h->ref_cache[m][scan8[0] - 1 - 1*8] = (h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride - 1]+3] == -1) ? PART_NOT_AVAILABLE : 1;

  512.                 }else

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

  514.             }else

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

  516. 

  517.             if (s->pict_type != AV_PICTURE_TYPE_B)

  518.                 break;

  519.         }

  520. 

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

  522.         if (s->pict_type == AV_PICTURE_TYPE_P) {

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

  524.                 return -1;

  525.         } else {        /* AV_PICTURE_TYPE_B */

  526.             if (mb_type != 2) {

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

  528.                     return -1;

  529.             } else {

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

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

  532.                 }

  533.             }

  534.             if (mb_type != 1) {

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

  536.                     return -1;

  537.             } else {

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

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

  540.                 }

  541.             }

  542.         }

  543. 

  544.         mb_type = MB_TYPE_16x16;

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

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

  547. 

  548.         if (mb_type == 8) {

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

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

  551.                     h->intra4x4_pred_mode_cache[scan8[0] - 1 + i*8] = h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - 1]+6-i];

  552.                 }

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

  554.                     h->left_samples_available = 0x5F5F;

  555.                 }

  556.             }

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

  558.                 h->intra4x4_pred_mode_cache[4+8*0] = h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride]+0];

  559.                 h->intra4x4_pred_mode_cache[5+8*0] = h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride]+1];

  560.                 h->intra4x4_pred_mode_cache[6+8*0] = h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride]+2];

  561.                 h->intra4x4_pred_mode_cache[7+8*0] = h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride]+3];

  562. 

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

  564.                     h->top_samples_available = 0x33FF;

  565.                 }

  566.             }

  567. 

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

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

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

  571. 

  572.                 if (vlc >= 25){

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

  574.                     return -1;

  575.                 }

  576. 

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

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

  579. 

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

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

  582. 

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

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

  585.                     return -1;

  586.                 }

  587.             }

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

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

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

  591.             }

  592.         }

  593. 

  594.         write_back_intra_pred_mode(h);

  595. 

  596.         if (mb_type == 8) {

  597.             ff_h264_check_intra4x4_pred_mode(h);

  598. 

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

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

  601.         } else {

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

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

  604.             }

  605. 

  606.             h->top_samples_available  = 0x33FF;

  607.             h->left_samples_available = 0x5F5F;

  608.         }

  609. 

  610.         mb_type = MB_TYPE_INTRA4x4;

  611.     } else {                      /* INTRA16x16 */

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

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

  614. 

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

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

  617.             return -1;

  618.         }

  619. 

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

  621.         mb_type = MB_TYPE_INTRA16x16;

  622.     }

  623. 

  624.     if (!IS_INTER(mb_type) && s->pict_type != AV_PICTURE_TYPE_I) {

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

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

  627.         }

  628.         if (s->pict_type == AV_PICTURE_TYPE_B) {

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

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

  631.             }

  632.         }

  633.     }

  634.     if (!IS_INTRA4x4(mb_type)) {

  635.         memset(h->intra4x4_pred_mode+h->mb2br_xy[mb_xy], DC_PRED, 8);

  636.     }

  637.     if (!IS_SKIP(mb_type) || s->pict_type == AV_PICTURE_TYPE_B) {

  638.         memset(h->non_zero_count_cache + 8, 0, 14*8*sizeof(uint8_t));

  639.         s->dsp.clear_blocks(h->mb+  0);

  640.         s->dsp.clear_blocks(h->mb+384);

  641.     }

  642. 

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

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

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

  646.             return -1;

  647.         }

  648. 

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

  650.     }

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

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

  653. 

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

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

  656.             return -1;

  657.         }

  658.     }

  659.     if (IS_INTRA16x16(mb_type)) {

  660.         AV_ZERO128(h->mb_luma_dc[0]+0);

  661.         AV_ZERO128(h->mb_luma_dc[0]+8);

  662.         if (svq3_decode_block(&s->gb, h->mb_luma_dc, 0, 1)){

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

  664.             return -1;

  665.         }

  666.     }

  667. 

  668.     if (cbp) {

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

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

  671. 

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

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

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

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

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

  677. 

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

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

  680.                         return -1;

  681.                     }

  682.                 }

  683.             }

  684.         }

  685. 

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

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

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

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

  690.                 return -1;

  691.               }

  692.             }

  693. 

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

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

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

  697.                         k = 16*i + j;

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

  699. 

  700.                         if (svq3_decode_block(&s->gb, &h->mb[16*k], 1, 1)){

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

  702.                             return -1;

  703.                         }

  704.                     }

  705.                 }

  706.             }

  707.         }

  708.     }

  709. 

  710.     h->cbp= cbp;

  711.     s->current_picture.f.mb_type[mb_xy] = mb_type;

  712. 

  713.     if (IS_INTRA(mb_type)) {

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

  715.     }

  716. 

  717.     return 0;

  718. }

  719. 

  720. static int svq3_decode_slice_header(AVCodecContext *avctx)

  721. {

  722.     SVQ3Context *svq3 = avctx->priv_data;

  723.     H264Context *h = &svq3->h;

  724.     MpegEncContext *s = &h->s;

  725.     const int mb_xy = h->mb_xy;

  726.     int i, header;

  727. 

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

  729. 

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

  731.         /* TODO: what? */

  732.         av_log(avctx, AV_LOG_ERROR, "unsupported slice header (%02X)\n", header);

  733.         return -1;

  734.     } else {

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

  736. 

  737.         svq3->next_slice_index = get_bits_count(&s->gb) + 8*show_bits(&s->gb, 8*length) + 8*length;

  738. 

  739.         if (svq3->next_slice_index > s->gb.size_in_bits) {

  740.             av_log(avctx, AV_LOG_ERROR, "slice after bitstream end\n");

  741.             return -1;

  742.     }

  743. 

  744.         s->gb.size_in_bits = svq3->next_slice_index - 8*(length - 1);

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

  746. 

  747.         if (svq3->watermark_key) {

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

  749.             AV_WL32(&s->gb.buffer[(get_bits_count(&s->gb)>>3)+1], header ^ svq3->watermark_key);

  750.         }

  751.         if (length > 0) {

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

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

  754.         }

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

  756.     }

  757. 

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

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

  760.         return -1;

  761.     }

  762. 

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

  764. 

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

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

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

  768.     } else {

  769.         skip_bits1(&s->gb);

  770.         s->mb_skip_run = 0;

  771.     }

  772. 

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

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

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

  776. 

  777.     /* unknown fields */

  778.     skip_bits1(&s->gb);

  779. 

  780.     if (svq3->unknown_flag) {

  781.         skip_bits1(&s->gb);

  782.     }

  783. 

  784.     skip_bits1(&s->gb);

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

  786. 

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

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

  789.     }

  790. 

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

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

  793.         memset(h->intra4x4_pred_mode+h->mb2br_xy[mb_xy - 1      ]+3, -1, 4*sizeof(int8_t));

  794.         memset(h->intra4x4_pred_mode+h->mb2br_xy[mb_xy - s->mb_x]  , -1, 8*sizeof(int8_t)*s->mb_x);

  795.     }

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

  797.         memset(h->intra4x4_pred_mode+h->mb2br_xy[mb_xy - s->mb_stride], -1, 8*sizeof(int8_t)*(s->mb_width - s->mb_x));

  798. 

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

  800.             h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride - 1]+3] = -1;

  801.         }

  802.     }

  803. 

  804.     return 0;

  805. }

  806. 

  807. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  808. {

  809.     SVQ3Context *svq3 = avctx->priv_data;

  810.     H264Context *h = &svq3->h;

  811.     MpegEncContext *s = &h->s;

  812.     int m;

  813.     unsigned char *extradata;

  814.     unsigned int size;

  815. 

  816.     if (ff_h264_decode_init(avctx) < 0)

  817.         return -1;

  818. 

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

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

  821.     s->unrestricted_mv = 1;

  822.     h->is_complex=1;

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

  824. 

  825.     if (!s->context_initialized) {

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

  827. 

  828.         svq3->halfpel_flag  = 1;

  829.         svq3->thirdpel_flag = 1;

  830.         svq3->unknown_flag  = 0;

  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.             svq3->halfpel_flag  = get_bits1(&gb);

  866.             svq3->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.             svq3->unknown_flag = get_bits1(&gb);

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

  885.             if (svq3->unknown_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 long 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, &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.                 svq3->watermark_key = ff_svq1_packet_checksum(buf, buf_len, 0);

  909.                 svq3->watermark_key = svq3->watermark_key << 16 | svq3->watermark_key;

  910.                 av_log(avctx, AV_LOG_DEBUG, "watermark key %#x\n", 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.         s->width  = avctx->width;

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

  921. 

  922.         if (MPV_common_init(s) < 0)

  923.             return -1;

  924. 

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

  926. 

  927.         if (ff_h264_alloc_tables(h) < 0) {

  928.             av_log(avctx, AV_LOG_ERROR, "svq3 memory allocation failed\n");

  929.             return AVERROR(ENOMEM);

  930.         }

  931.     }

  932. 

  933.     return 0;

  934. }

  935. 

  936. static int svq3_decode_frame(AVCodecContext *avctx,

  937.                              void *data, int *data_size,

  938.                              AVPacket *avpkt)

  939. {

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

  941.     SVQ3Context *svq3 = avctx->priv_data;

  942.     H264Context *h = &svq3->h;

  943.     MpegEncContext *s = &h->s;

  944.     int buf_size = avpkt->size;

  945.     int m, mb_type;

  946. 

  947.     /* special case for last picture */

  948.     if (buf_size == 0) {

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

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

  951.             s->next_picture_ptr = NULL;

  952.             *data_size = sizeof(AVFrame);

  953.         }

  954.         return 0;

  955.     }

  956. 

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

  958. 

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

  960. 

  961.     if (svq3_decode_slice_header(avctx))

  962.         return -1;

  963. 

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

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

  966. 

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

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

  969.                av_get_picture_type_char(s->pict_type), svq3->halfpel_flag, svq3->thirdpel_flag,

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

  971.     }

  972. 

  973.     /* for skipping the frame */

  974.     s->current_picture.f.pict_type = s->pict_type;

  975.     s->current_picture.f.key_frame = (s->pict_type == AV_PICTURE_TYPE_I);

  976. 

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

  978.     if (s->last_picture_ptr == NULL && s->pict_type == AV_PICTURE_TYPE_B)

  979.         return 0;

  980.     if (  (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B)

  981.         ||(avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I)

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

  983.         return 0;

  984. 

  985.     if (s->next_p_frame_damaged) {

  986.         if (s->pict_type == AV_PICTURE_TYPE_B)

  987.             return 0;

  988.         else

  989.             s->next_p_frame_damaged = 0;

  990.     }

  991. 

  992.     if (ff_h264_frame_start(h) < 0)

  993.         return -1;

  994. 

  995.     if (s->pict_type == AV_PICTURE_TYPE_B) {

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

  997. 

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

  999.             h->frame_num_offset += 256;

  1000.         }

  1001.         if (h->frame_num_offset == 0 || h->frame_num_offset >= h->prev_frame_num_offset) {

  1002.             av_log(h->s.avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  1003.             return -1;

  1004.         }

  1005.     } else {

  1006.         h->prev_frame_num = h->frame_num;

  1007.         h->frame_num = h->slice_num;

  1008.         h->prev_frame_num_offset = (h->frame_num - h->prev_frame_num);

  1009. 

  1010.         if (h->prev_frame_num_offset < 0) {

  1011.             h->prev_frame_num_offset += 256;

  1012.         }

  1013.     }

  1014. 

  1015.     for (m = 0; m < 2; m++){

  1016.         int i;

  1017.         for (i = 0; i < 4; i++){

  1018.             int j;

  1019.             for (j = -1; j < 4; j++)

  1020.                 h->ref_cache[m][scan8[0] + 8*i + j]= 1;

  1021.             if (i < 3)

  1022.                 h->ref_cache[m][scan8[0] + 8*i + j]= PART_NOT_AVAILABLE;

  1023.         }

  1024.     }

  1025. 

  1026.     for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  1027.         for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  1028.             h->mb_xy = s->mb_x + s->mb_y*s->mb_stride;

  1029. 

  1030.             if ( (get_bits_count(&s->gb) + 7) >= s->gb.size_in_bits &&

  1031.                 ((get_bits_count(&s->gb) & 7) == 0 || show_bits(&s->gb, (-get_bits_count(&s->gb) & 7)) == 0)) {

  1032. 

  1033.                 skip_bits(&s->gb, svq3->next_slice_index - get_bits_count(&s->gb));

  1034.                 s->gb.size_in_bits = 8*buf_size;

  1035. 

  1036.                 if (svq3_decode_slice_header(avctx))

  1037.                     return -1;

  1038. 

  1039.                 /* TODO: support s->mb_skip_run */

  1040.             }

  1041. 

  1042.             mb_type = svq3_get_ue_golomb(&s->gb);

  1043. 

  1044.             if (s->pict_type == AV_PICTURE_TYPE_I) {

  1045.                 mb_type += 8;

  1046.             } else if (s->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4) {

  1047.                 mb_type += 4;

  1048.             }

  1049.             if ((unsigned)mb_type > 33 || svq3_decode_mb(svq3, mb_type)) {

  1050.                 av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1051.                 return -1;

  1052.             }

  1053. 

  1054.             if (mb_type != 0) {

  1055.                 ff_h264_hl_decode_mb (h);

  1056.             }

  1057. 

  1058.             if (s->pict_type != AV_PICTURE_TYPE_B && !s->low_delay) {

  1059.                 s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] =

  1060.                     (s->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1061.             }

  1062.         }

  1063. 

  1064.         ff_draw_horiz_band(s, 16*s->mb_y, 16);

  1065.     }

  1066. 

  1067.     MPV_frame_end(s);

  1068. 

  1069.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  1070.         *(AVFrame *) data = *(AVFrame *) &s->current_picture;

  1071.     } else {

  1072.         *(AVFrame *) data = *(AVFrame *) &s->last_picture;

  1073.     }

  1074. 

  1075.     /* Do not output the last pic after seeking. */

  1076.     if (s->last_picture_ptr || s->low_delay) {

  1077.         *data_size = sizeof(AVFrame);

  1078.     }

  1079. 

  1080.     return buf_size;

  1081. }

  1082. 

  1083. static int svq3_decode_end(AVCodecContext *avctx)

  1084. {

  1085.     SVQ3Context *svq3 = avctx->priv_data;

  1086.     H264Context *h = &svq3->h;

  1087.     MpegEncContext *s = &h->s;

  1088. 

  1089.     ff_h264_free_context(h);

  1090. 

  1091.     MPV_common_end(s);

  1092. 

  1093.     return 0;

  1094. }

  1095. 

  1096. AVCodec ff_svq3_decoder = {

  1097.     .name           = "svq3",

  1098.     .type           = AVMEDIA_TYPE_VIDEO,

  1099.     .id             = CODEC_ID_SVQ3,

  1100.     .priv_data_size = sizeof(SVQ3Context),

  1101.     .init           = svq3_decode_init,

  1102.     .close          = svq3_decode_end,

  1103.     .decode         = svq3_decode_frame,

  1104.     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1105.     .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1106.     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_NONE},

  1107. };