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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.data[0] + x + y*s->linesize;

  292.     src  = pic->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.data[i] + (x >> 1) + (y >> 1)*s->uvlinesize;

  313.             src  = pic->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.motion_val[0][b_xy][0]<<1;

  351.                 my = s->next_picture.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.motion_val[dir][b_xy], part_width>>2, part_height>>2, h->b_stride, pack16to32(mx,my), 4);

  429.         }

  430.     }

  431. 

  432.     return 0;

  433. }

  434. 

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

  436. {

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

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

  439.     int cbp = 0;

  440.     uint32_t vlc;

  441.     int8_t *top, *left;

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

  443.     const int mb_xy = h->mb_xy;

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

  445. 

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

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

  448.     h->topright_samples_available = 0xFFFF;

  449. 

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

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

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

  453. 

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

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

  456.             }

  457. 

  458.             mb_type = MB_TYPE_SKIP;

  459.         } else {

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

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

  462.                 return -1;

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

  464.                 return -1;

  465. 

  466.             mb_type = MB_TYPE_16x16;

  467.         }

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

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

  470.             mode = THIRDPEL_MODE;

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

  472.             mode = HALFPEL_MODE;

  473.         } else {

  474.             mode = FULLPEL_MODE;

  475.         }

  476. 

  477.         /* fill caches */

  478.         /* note ref_cache should contain here:

  479.             ????????

  480.             ???11111

  481.             N??11111

  482.             N??11111

  483.             N??11111

  484.         */

  485. 

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

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

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

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

  490.                 }

  491.             } else {

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

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

  494.                 }

  495.             }

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

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

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

  499. 

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

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

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

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

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

  505.                 }else

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

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

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

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

  510.                 }else

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

  512.             }else

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

  514. 

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

  516.                 break;

  517.         }

  518. 

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

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

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

  522.                 return -1;

  523.         } else {        /* AV_PICTURE_TYPE_B */

  524.             if (mb_type != 2) {

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

  526.                     return -1;

  527.             } else {

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

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

  530.                 }

  531.             }

  532.             if (mb_type != 1) {

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

  534.                     return -1;

  535.             } else {

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

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

  538.                 }

  539.             }

  540.         }

  541. 

  542.         mb_type = MB_TYPE_16x16;

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

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

  545. 

  546.         if (mb_type == 8) {

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

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

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

  550.                 }

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

  552.                     h->left_samples_available = 0x5F5F;

  553.                 }

  554.             }

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

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

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

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

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

  560. 

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

  562.                     h->top_samples_available = 0x33FF;

  563.                 }

  564.             }

  565. 

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

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

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

  569. 

  570.                 if (vlc >= 25){

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

  572.                     return -1;

  573.                 }

  574. 

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

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

  577. 

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

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

  580. 

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

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

  583.                     return -1;

  584.                 }

  585.             }

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

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

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

  589.             }

  590.         }

  591. 

  592.         write_back_intra_pred_mode(h);

  593. 

  594.         if (mb_type == 8) {

  595.             ff_h264_check_intra4x4_pred_mode(h);

  596. 

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

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

  599.         } else {

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

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

  602.             }

  603. 

  604.             h->top_samples_available  = 0x33FF;

  605.             h->left_samples_available = 0x5F5F;

  606.         }

  607. 

  608.         mb_type = MB_TYPE_INTRA4x4;

  609.     } else {                      /* INTRA16x16 */

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

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

  612. 

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

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

  615.             return -1;

  616.         }

  617. 

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

  619.         mb_type = MB_TYPE_INTRA16x16;

  620.     }

  621. 

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

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

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

  625.         }

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

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

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

  629.             }

  630.         }

  631.     }

  632.     if (!IS_INTRA4x4(mb_type)) {

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

  634.     }

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

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

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

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

  639.     }

  640. 

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

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

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

  644.             return -1;

  645.         }

  646. 

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

  648.     }

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

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

  651. 

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

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

  654.             return -1;

  655.         }

  656.     }

  657.     if (IS_INTRA16x16(mb_type)) {

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

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

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

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

  662.             return -1;

  663.         }

  664.     }

  665. 

  666.     if (cbp) {

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

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

  669. 

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

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

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

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

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

  675. 

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

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

  678.                         return -1;

  679.                     }

  680.                 }

  681.             }

  682.         }

  683. 

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

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

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

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

  688.                 return -1;

  689.               }

  690.             }

  691. 

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

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

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

  695.                         k = 16*i + j;

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

  697. 

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

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

  700.                             return -1;

  701.                         }

  702.                     }

  703.                 }

  704.             }

  705.         }

  706.     }

  707. 

  708.     h->cbp= cbp;

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

  710. 

  711.     if (IS_INTRA(mb_type)) {

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

  713.     }

  714. 

  715.     return 0;

  716. }

  717. 

  718. static int svq3_decode_slice_header(AVCodecContext *avctx)

  719. {

  720.     SVQ3Context *svq3 = avctx->priv_data;

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

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

  723.     const int mb_xy = h->mb_xy;

  724.     int i, header;

  725. 

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

  727. 

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

  729.         /* TODO: what? */

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

  731.         return -1;

  732.     } else {

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

  734. 

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

  736. 

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

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

  739.             return -1;

  740.     }

  741. 

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

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

  744. 

  745.         if (svq3->watermark_key) {

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

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

  748.         }

  749.         if (length > 0) {

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

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

  752.         }

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

  754.     }

  755. 

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

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

  758.         return -1;

  759.     }

  760. 

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

  762. 

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

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

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

  766.     } else {

  767.         skip_bits1(&s->gb);

  768.         s->mb_skip_run = 0;

  769.     }

  770. 

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

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

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

  774. 

  775.     /* unknown fields */

  776.     skip_bits1(&s->gb);

  777. 

  778.     if (svq3->unknown_flag) {

  779.         skip_bits1(&s->gb);

  780.     }

  781. 

  782.     skip_bits1(&s->gb);

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

  784. 

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

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

  787.     }

  788. 

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

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

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

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

  793.     }

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

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

  796. 

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

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

  799.         }

  800.     }

  801. 

  802.     return 0;

  803. }

  804. 

  805. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  806. {

  807.     SVQ3Context *svq3 = avctx->priv_data;

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

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

  810.     int m;

  811.     unsigned char *extradata;

  812.     unsigned int size;

  813. 

  814.     if (ff_h264_decode_init(avctx) < 0)

  815.         return -1;

  816. 

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

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

  819.     s->unrestricted_mv = 1;

  820.     h->is_complex=1;

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

  822. 

  823.     if (!s->context_initialized) {

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

  825. 

  826.         svq3->halfpel_flag  = 1;

  827.         svq3->thirdpel_flag = 1;

  828.         svq3->unknown_flag  = 0;

  829. 

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

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

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

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

  834.                 break;

  835.             extradata++;

  836.         }

  837. 

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

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

  840. 

  841.             GetBitContext gb;

  842.             int frame_size_code;

  843. 

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

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

  846. 

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

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

  849.             switch (frame_size_code) {

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

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

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

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

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

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

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

  857.                 case 7:

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

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

  860.                     break;

  861.             }

  862. 

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

  864.             svq3->thirdpel_flag = get_bits1(&gb);

  865. 

  866.             /* unknown fields */

  867.             skip_bits1(&gb);

  868.             skip_bits1(&gb);

  869.             skip_bits1(&gb);

  870.             skip_bits1(&gb);

  871. 

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

  873. 

  874.             /* unknown field */

  875.             skip_bits1(&gb);

  876. 

  877.             while (get_bits1(&gb)) {

  878.                 skip_bits(&gb, 8);

  879.             }

  880. 

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

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

  883.             if (svq3->unknown_flag) {

  884. #if CONFIG_ZLIB

  885.                 unsigned watermark_width  = svq3_get_ue_golomb(&gb);

  886.                 unsigned watermark_height = svq3_get_ue_golomb(&gb);

  887.                 int u1 = svq3_get_ue_golomb(&gb);

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

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

  890.                 int u4 = svq3_get_ue_golomb(&gb);

  891.                 unsigned long buf_len = watermark_width*watermark_height*4;

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

  893.                 uint8_t *buf;

  894. 

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

  896.                     return -1;

  897. 

  898.                 buf = av_malloc(buf_len);

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

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

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

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

  903.                     av_free(buf);

  904.                     return -1;

  905.                 }

  906.                 svq3->watermark_key = ff_svq1_packet_checksum(buf, buf_len, 0);

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

  908.                 av_log(avctx, AV_LOG_DEBUG, "watermark key %#x\n", svq3->watermark_key);

  909.                 av_free(buf);

  910. #else

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

  912.                 return -1;

  913. #endif

  914.             }

  915.         }

  916. 

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

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

  919. 

  920.         if (MPV_common_init(s) < 0)

  921.             return -1;

  922. 

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

  924. 

  925.         ff_h264_alloc_tables(h);

  926.     }

  927. 

  928.     return 0;

  929. }

  930. 

  931. static int svq3_decode_frame(AVCodecContext *avctx,

  932.                              void *data, int *data_size,

  933.                              AVPacket *avpkt)

  934. {

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

  936.     SVQ3Context *svq3 = avctx->priv_data;

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

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

  939.     int buf_size = avpkt->size;

  940.     int m, mb_type;

  941. 

  942.     /* special case for last picture */

  943.     if (buf_size == 0) {

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

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

  946.             s->next_picture_ptr = NULL;

  947.             *data_size = sizeof(AVFrame);

  948.         }

  949.         return 0;

  950.     }

  951. 

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

  953. 

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

  955. 

  956.     if (svq3_decode_slice_header(avctx))

  957.         return -1;

  958. 

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

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

  961. 

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

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

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

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

  966.     }

  967. 

  968.     /* for skipping the frame */

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

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

  971. 

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

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

  974.         return 0;

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

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

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

  978.         return 0;

  979. 

  980.     if (s->next_p_frame_damaged) {

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

  982.             return 0;

  983.         else

  984.             s->next_p_frame_damaged = 0;

  985.     }

  986. 

  987.     if (ff_h264_frame_start(h) < 0)

  988.         return -1;

  989. 

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

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

  992. 

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

  994.             h->frame_num_offset += 256;

  995.         }

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

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

  998.             return -1;

  999.         }

  1000.     } else {

  1001.         h->prev_frame_num = h->frame_num;

  1002.         h->frame_num = h->slice_num;

  1003.         h->prev_frame_num_offset = (h->frame_num - h->prev_frame_num);

  1004. 

  1005.         if (h->prev_frame_num_offset < 0) {

  1006.             h->prev_frame_num_offset += 256;

  1007.         }

  1008.     }

  1009. 

  1010.     for (m = 0; m < 2; m++){

  1011.         int i;

  1012.         for (i = 0; i < 4; i++){

  1013.             int j;

  1014.             for (j = -1; j < 4; j++)

  1015.                 h->ref_cache[m][scan8[0] + 8*i + j]= 1;

  1016.             if (i < 3)

  1017.                 h->ref_cache[m][scan8[0] + 8*i + j]= PART_NOT_AVAILABLE;

  1018.         }

  1019.     }

  1020. 

  1021.     for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  1022.         for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  1023.             h->mb_xy = s->mb_x + s->mb_y*s->mb_stride;

  1024. 

  1025.             if ( (get_bits_count(&s->gb) + 7) >= s->gb.size_in_bits &&

  1026.                 ((get_bits_count(&s->gb) & 7) == 0 || show_bits(&s->gb, (-get_bits_count(&s->gb) & 7)) == 0)) {

  1027. 

  1028.                 skip_bits(&s->gb, svq3->next_slice_index - get_bits_count(&s->gb));

  1029.                 s->gb.size_in_bits = 8*buf_size;

  1030. 

  1031.                 if (svq3_decode_slice_header(avctx))

  1032.                     return -1;

  1033. 

  1034.                 /* TODO: support s->mb_skip_run */

  1035.             }

  1036. 

  1037.             mb_type = svq3_get_ue_golomb(&s->gb);

  1038. 

  1039.             if (s->pict_type == AV_PICTURE_TYPE_I) {

  1040.                 mb_type += 8;

  1041.             } else if (s->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4) {

  1042.                 mb_type += 4;

  1043.             }

  1044.             if ((unsigned)mb_type > 33 || svq3_decode_mb(svq3, mb_type)) {

  1045.                 av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1046.                 return -1;

  1047.             }

  1048. 

  1049.             if (mb_type != 0) {

  1050.                 ff_h264_hl_decode_mb (h);

  1051.             }

  1052. 

  1053.             if (s->pict_type != AV_PICTURE_TYPE_B && !s->low_delay) {

  1054.                 s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =

  1055.                     (s->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1056.             }

  1057.         }

  1058. 

  1059.         ff_draw_horiz_band(s, 16*s->mb_y, 16);

  1060.     }

  1061. 

  1062.     MPV_frame_end(s);

  1063. 

  1064.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  1065.         *(AVFrame *) data = *(AVFrame *) &s->current_picture;

  1066.     } else {

  1067.         *(AVFrame *) data = *(AVFrame *) &s->last_picture;

  1068.     }

  1069. 

  1070.     /* Do not output the last pic after seeking. */

  1071.     if (s->last_picture_ptr || s->low_delay) {

  1072.         *data_size = sizeof(AVFrame);

  1073.     }

  1074. 

  1075.     return buf_size;

  1076. }

  1077. 

  1078. static int svq3_decode_end(AVCodecContext *avctx)

  1079. {

  1080.     SVQ3Context *svq3 = avctx->priv_data;

  1081.     H264Context *h = &svq3->h;

  1082.     MpegEncContext *s = &h->s;

  1083. 

  1084.     ff_h264_free_context(h);

  1085. 

  1086.     MPV_common_end(s);

  1087. 

  1088.     return 0;

  1089. }

  1090. 

  1091. AVCodec ff_svq3_decoder = {

  1092.     "svq3",

  1093.     AVMEDIA_TYPE_VIDEO,

  1094.     CODEC_ID_SVQ3,

  1095.     sizeof(SVQ3Context),

  1096.     svq3_decode_init,

  1097.     NULL,

  1098.     svq3_decode_end,

  1099.     svq3_decode_frame,

  1100.     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1101.     .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1102.     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_NONE},

  1103. };