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FFmpeg/libavcodec/svq3.c

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  1. /*

  2.  * Copyright (c) 2003 The FFmpeg Project

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg is free software; you can redistribute it and/or

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

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

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * FFmpeg is distributed in the hope that it will be useful,

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

  17.  * License along with FFmpeg; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. /*

  22.  * How to use this decoder:

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

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

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

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

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

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

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

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

  31.  *

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

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

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

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

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

  37.  *

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

  39.  * correctly decodes this file:

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

  41.  */

  42. #include "internal.h"

  43. #include "dsputil.h"

  44. #include "avcodec.h"

  45. #include "mpegvideo.h"

  46. #include "h264.h"

  47. 

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

  49. 

  50. #include "h264_mvpred.h"

  51. #include "golomb.h"

  52. #include "rectangle.h"

  53. #include "vdpau_internal.h"

  54. 

  55. #if CONFIG_ZLIB

  56. #include <zlib.h>

  57. #endif

  58. 

  59. #include "svq1.h"

  60. 

  61. /**

  62.  * @file

  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.     uint8_t *buf;

  74.     int buf_size;

  75. } SVQ3Context;

  76. 

  77. #define FULLPEL_MODE  1

  78. #define HALFPEL_MODE  2

  79. #define THIRDPEL_MODE 3

  80. #define PREDICT_MODE  4

  81. 

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

  83.  o-->o-->o   o

  84.          |  /|

  85.  o   o   o / o

  86.  | / |   |/  |

  87.  o   o   o   o

  88.    /

  89.  o-->o-->o-->o

  90. */

  91. static const uint8_t svq3_scan[16] = {

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

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

  94.     0+1*4, 0+2*4, 1+1*4, 1+2*4,

  95.     0+3*4, 1+3*4, 2+3*4, 3+3*4,

  96. };

  97. 

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

  99.     { 0, 0 },

  100.     { 1, 0 }, { 0, 1 },

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

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

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

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

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

  106.     { 4, 3 }, { 3, 4 },

  107.     { 4, 4 }

  108. };

  109. 

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

  111.     { { 2,-1,-1,-1,-1 }, { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 },

  112.       { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 }, { 1, 2,-1,-1,-1 } },

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

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

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

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

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

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

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

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

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

  122.       { 4, 2, 0, 1, 3 }, { 2, 0, 1, 4, 3 }, { 4, 2, 1, 0, 3 } },

  123. };

  124. 

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

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

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

  128.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  129.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  130. };

  131. 

  132. static const uint32_t svq3_dequant_coeff[32] = {

  133.      3881,  4351,  4890,  5481,  6154,  6914,  7761,  8718,

  134.      9781, 10987, 12339, 13828, 15523, 17435, 19561, 21873,

  135.     24552, 27656, 30847, 34870, 38807, 43747, 49103, 54683,

  136.     61694, 68745, 77615, 89113,100253,109366,126635,141533

  137. };

  138. 

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

  140.     const int qmul = svq3_dequant_coeff[qp];

  141. #define stride 16

  142.     int i;

  143.     int temp[16];

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

  145. 

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

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

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

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

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

  151. 

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

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

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

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

  156.     }

  157. 

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

  159.         const int offset= x_offset[i];

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

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

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

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

  164. 

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

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

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

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

  169.     }

  170. }

  171. #undef stride

  172. 

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

  174.                             int dc)

  175. {

  176.     const int qmul = svq3_dequant_coeff[qp];

  177.     int i;

  178.     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

  179. 

  180.     if (dc) {

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

  182.         block[0] = 0;

  183.     }

  184. 

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

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

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

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

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

  190. 

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

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

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

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

  195.     }

  196. 

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

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

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

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

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

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

  203. 

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

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

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

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

  208.     }

  209. }

  210. 

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

  212.                                     int index, const int type)

  213. {

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

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

  216. 

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

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

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

  220. 

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

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

  223. 

  224.           if (vlc < 0)

  225.               return -1;

  226. 

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

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

  229. 

  230.           if (type == 3) {

  231.               if (vlc < 3) {

  232.                   run   = 0;

  233.                   level = vlc;

  234.               } else if (vlc < 4) {

  235.                   run   = 1;

  236.                   level = 1;

  237.               } else {

  238.                   run   = (vlc & 0x3);

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

  240.               }

  241.           } else {

  242.               if (vlc < 16U) {

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

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

  245.               } else if (intra) {

  246.                   run   = (vlc & 0x7);

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

  248.               } else {

  249.                   run   = (vlc & 0xF);

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

  251.               }

  252.           }

  253. 

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

  255.               return -1;

  256. 

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

  258.         }

  259. 

  260.         if (type != 2) {

  261.             break;

  262.         }

  263.     }

  264. 

  265.     return 0;

  266. }

  267. 

  268. static inline void svq3_mc_dir_part(MpegEncContext *s,

  269.                                     int x, int y, int width, int height,

  270.                                     int mx, int my, int dxy,

  271.                                     int thirdpel, int dir, int avg)

  272. {

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

  274.     uint8_t *src, *dest;

  275.     int i, emu = 0;

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

  277. 

  278.     mx += x;

  279.     my += y;

  280. 

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

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

  283. 

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

  285.             emu = 1;

  286.         }

  287. 

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

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

  290.     }

  291. 

  292.     /* form component predictions */

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

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

  295. 

  296.     if (emu) {

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

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

  299.         src = s->edge_emu_buffer;

  300.     }

  301.     if (thirdpel)

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

  303.     else

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

  305. 

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

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

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

  309.         width  = (width  >> 1);

  310.         height = (height >> 1);

  311.         blocksize++;

  312. 

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

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

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

  316. 

  317.             if (emu) {

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

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

  320.                 src = s->edge_emu_buffer;

  321.             }

  322.             if (thirdpel)

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

  324.             else

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

  326.         }

  327.     }

  328. }

  329. 

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

  331.                               int avg)

  332. {

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

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

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

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

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

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

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

  340. 

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

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

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

  344.             int dxy;

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

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

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

  348. 

  349.             if (mode != PREDICT_MODE) {

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

  351.             } else {

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

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

  354. 

  355.                 if (dir == 0) {

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

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

  358.                 } else {

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

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

  361.                 }

  362.             }

  363. 

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

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

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

  367. 

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

  369.             if (mode == PREDICT_MODE) {

  370.                 dx = dy = 0;

  371.             } else {

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

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

  374. 

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

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

  377.                     return -1;

  378.                 }

  379.             }

  380. 

  381.             /* compute motion vector */

  382.             if (mode == THIRDPEL_MODE) {

  383.                 int fx, fy;

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

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

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

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

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

  389. 

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

  391.                 mx += mx;

  392.                 my += my;

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

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

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

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

  397. 

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

  399.                 mx *= 3;

  400.                 my *= 3;

  401.             } else {

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

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

  404. 

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

  406.                 mx *= 6;

  407.                 my *= 6;

  408.             }

  409. 

  410.             /* update mv_cache */

  411.             if (mode != PREDICT_MODE) {

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

  413. 

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

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

  416. 

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

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

  419.                     }

  420.                 }

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

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

  423.                 }

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

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

  426.                 }

  427.             }

  428. 

  429.             /* write back motion vectors */

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

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

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

  433.         }

  434.     }

  435. 

  436.     return 0;

  437. }

  438. 

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

  440. {

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

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

  443.     int cbp = 0;

  444.     uint32_t vlc;

  445.     int8_t *top, *left;

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

  447.     const int mb_xy = h->mb_xy;

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

  449. 

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

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

  452.     h->topright_samples_available = 0xFFFF;

  453. 

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

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

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

  457. 

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

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

  460.             }

  461. 

  462.             mb_type = MB_TYPE_SKIP;

  463.         } else {

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

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

  466.                 return -1;

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

  468.                 return -1;

  469. 

  470.             mb_type = MB_TYPE_16x16;

  471.         }

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

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

  474.             mode = THIRDPEL_MODE;

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

  476.             mode = HALFPEL_MODE;

  477.         } else {

  478.             mode = FULLPEL_MODE;

  479.         }

  480. 

  481.         /* fill caches */

  482.         /* note ref_cache should contain here:

  483.             ????????

  484.             ???11111

  485.             N??11111

  486.             N??11111

  487.             N??11111

  488.         */

  489. 

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

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

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

  493.                     *(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];

  494.                 }

  495.             } else {

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

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

  498.                 }

  499.             }

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

  501.                 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));

  502.                 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);

  503. 

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

  505.                     *(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];

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

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

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

  509.                 }else

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

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

  512.                     *(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];

  513.                     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;

  514.                 }else

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

  516.             }else

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

  518. 

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

  520.                 break;

  521.         }

  522. 

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

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

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

  526.                 return -1;

  527.         } else {        /* AV_PICTURE_TYPE_B */

  528.             if (mb_type != 2) {

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

  530.                     return -1;

  531.             } else {

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

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

  534.                 }

  535.             }

  536.             if (mb_type != 1) {

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

  538.                     return -1;

  539.             } else {

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

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

  542.                 }

  543.             }

  544.         }

  545. 

  546.         mb_type = MB_TYPE_16x16;

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

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

  549. 

  550.         if (mb_type == 8) {

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

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

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

  554.                 }

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

  556.                     h->left_samples_available = 0x5F5F;

  557.                 }

  558.             }

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

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

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

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

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

  564. 

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

  566.                     h->top_samples_available = 0x33FF;

  567.                 }

  568.             }

  569. 

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

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

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

  573. 

  574.                 if (vlc >= 25U){

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

  576.                     return -1;

  577.                 }

  578. 

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

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

  581. 

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

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

  584. 

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

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

  587.                     return -1;

  588.                 }

  589.             }

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

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

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

  593.             }

  594.         }

  595. 

  596.         write_back_intra_pred_mode(h);

  597. 

  598.         if (mb_type == 8) {

  599.             ff_h264_check_intra4x4_pred_mode(h);

  600. 

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

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

  603.         } else {

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

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

  606.             }

  607. 

  608.             h->top_samples_available  = 0x33FF;

  609.             h->left_samples_available = 0x5F5F;

  610.         }

  611. 

  612.         mb_type = MB_TYPE_INTRA4x4;

  613.     } else {                      /* INTRA16x16 */

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

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

  616. 

  617.         if ((h->intra16x16_pred_mode = ff_h264_check_intra16x16_pred_mode(h, dir)) == -1){

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

  619.             return -1;

  620.         }

  621. 

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

  623.         mb_type = MB_TYPE_INTRA16x16;

  624.     }

  625. 

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

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

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

  629.         }

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

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

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

  633.             }

  634.         }

  635.     }

  636.     if (!IS_INTRA4x4(mb_type)) {

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

  638.     }

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

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

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

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

  643.     }

  644. 

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

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

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

  648.             return -1;

  649.         }

  650. 

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

  652.     }

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

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

  655. 

  656.         if (s->qscale > 31U){

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

  658.             return -1;

  659.         }

  660.     }

  661.     if (IS_INTRA16x16(mb_type)) {

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

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

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

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

  666.             return -1;

  667.         }

  668.     }

  669. 

  670.     if (cbp) {

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

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

  673. 

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

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

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

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

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

  679. 

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

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

  682.                         return -1;

  683.                     }

  684.                 }

  685.             }

  686.         }

  687. 

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

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

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

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

  692.                 return -1;

  693.               }

  694.             }

  695. 

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

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

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

  699.                         k = 16*i + j;

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

  701. 

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

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

  704.                             return -1;

  705.                         }

  706.                     }

  707.                 }

  708.             }

  709.         }

  710.     }

  711. 

  712.     h->cbp= cbp;

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

  714. 

  715.     if (IS_INTRA(mb_type)) {

  716.         h->chroma_pred_mode = ff_h264_check_intra_chroma_pred_mode(h, DC_PRED8x8);

  717.     }

  718. 

  719.     return 0;

  720. }

  721. 

  722. static int svq3_decode_slice_header(AVCodecContext *avctx)

  723. {

  724.     SVQ3Context *svq3 = avctx->priv_data;

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

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

  727.     const int mb_xy = h->mb_xy;

  728.     int i, header;

  729. 

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

  731. 

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

  733.         /* TODO: what? */

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

  735.         return -1;

  736.     } else {

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

  738. 

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

  740. 

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

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

  743.             return -1;

  744.     }

  745. 

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

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

  748. 

  749.         if (svq3->watermark_key) {

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

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

  752.         }

  753.         if (length > 0) {

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

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

  756.         }

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

  758.     }

  759. 

  760.     if ((i = svq3_get_ue_golomb(&s->gb)) >= 3U){

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

  762.         return -1;

  763.     }

  764. 

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

  766. 

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

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

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

  770.     } else {

  771.         skip_bits1(&s->gb);

  772.         s->mb_skip_run = 0;

  773.     }

  774. 

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

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

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

  778. 

  779.     /* unknown fields */

  780.     skip_bits1(&s->gb);

  781. 

  782.     if (svq3->unknown_flag) {

  783.         skip_bits1(&s->gb);

  784.     }

  785. 

  786.     skip_bits1(&s->gb);

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

  788. 

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

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

  791.     }

  792. 

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

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

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

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

  797.     }

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

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

  800. 

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

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

  803.         }

  804.     }

  805. 

  806.     return 0;

  807. }

  808. 

  809. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  810. {

  811.     SVQ3Context *svq3 = avctx->priv_data;

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

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

  814.     int m;

  815.     unsigned char *extradata;

  816.     unsigned int size;

  817. 

  818.     if (ff_h264_decode_init(avctx) < 0)

  819.         return -1;

  820. 

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

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

  823.     s->unrestricted_mv = 1;

  824.     h->is_complex=1;

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

  826. 

  827.     if (!s->context_initialized) {

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

  829. 

  830.         svq3->halfpel_flag  = 1;

  831.         svq3->thirdpel_flag = 1;

  832.         svq3->unknown_flag  = 0;

  833. 

  834. 

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

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

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

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

  839.                 break;

  840.             extradata++;

  841.         }

  842. 

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

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

  845. 

  846.             GetBitContext gb;

  847.             int frame_size_code;

  848. 

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

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

  851. 

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

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

  854.             switch (frame_size_code) {

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

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

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

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

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

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

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

  862.                 case 7:

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

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

  865.                     break;

  866.             }

  867. 

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

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

  870. 

  871.             /* unknown fields */

  872.             skip_bits1(&gb);

  873.             skip_bits1(&gb);

  874.             skip_bits1(&gb);

  875.             skip_bits1(&gb);

  876. 

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

  878. 

  879.             /* unknown field */

  880.             skip_bits1(&gb);

  881. 

  882.             while (get_bits1(&gb)) {

  883.                 skip_bits(&gb, 8);

  884.             }

  885. 

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

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

  888.             if (svq3->unknown_flag) {

  889. #if CONFIG_ZLIB

  890.                 unsigned watermark_width  = svq3_get_ue_golomb(&gb);

  891.                 unsigned watermark_height = svq3_get_ue_golomb(&gb);

  892.                 int u1 = svq3_get_ue_golomb(&gb);

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

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

  895.                 int u4 = svq3_get_ue_golomb(&gb);

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

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

  898.                 uint8_t *buf;

  899. 

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

  901.                     return -1;

  902. 

  903.                 buf = av_malloc(buf_len);

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

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

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

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

  908.                     av_free(buf);

  909.                     return -1;

  910.                 }

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

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

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

  914.                 av_free(buf);

  915. #else

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

  917.                 return -1;

  918. #endif

  919.             }

  920.         }

  921. 

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

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

  924. 

  925.         if (MPV_common_init(s) < 0)

  926.             return -1;

  927. 

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

  929. 

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

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

  932.             return AVERROR(ENOMEM);

  933.         }

  934.     }

  935. 

  936.     return 0;

  937. }

  938. 

  939. static int svq3_decode_frame(AVCodecContext *avctx,

  940.                              void *data, int *data_size,

  941.                              AVPacket *avpkt)

  942. {

  943.     SVQ3Context *svq3 = avctx->priv_data;

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

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

  946.     int buf_size = avpkt->size;

  947.     int m, mb_type, left;

  948.     uint8_t *buf;

  949. 

  950.     /* special case for last picture */

  951.     if (buf_size == 0) {

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

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

  954.             s->next_picture_ptr = NULL;

  955.             *data_size = sizeof(AVFrame);

  956.         }

  957.         return 0;

  958.     }

  959. 

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

  961. 

  962.     if (svq3->watermark_key) {

  963.         av_fast_malloc(&svq3->buf, &svq3->buf_size,

  964.                        buf_size+FF_INPUT_BUFFER_PADDING_SIZE);

  965.         if (!svq3->buf)

  966.             return AVERROR(ENOMEM);

  967.         memcpy(svq3->buf, avpkt->data, buf_size);

  968.         buf = svq3->buf;

  969.     } else {

  970.         buf = avpkt->data;

  971.     }

  972. 

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

  974. 

  975.     if (svq3_decode_slice_header(avctx))

  976.         return -1;

  977. 

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

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

  980. 

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

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

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

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

  985.     }

  986. 

  987.     /* for skipping the frame */

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

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

  990. 

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

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

  993.         return 0;

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

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

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

  997.         return 0;

  998. 

  999.     if (s->next_p_frame_damaged) {

  1000.         if (s->pict_type == AV_PICTURE_TYPE_B)

  1001.             return 0;

  1002.         else

  1003.             s->next_p_frame_damaged = 0;

  1004.     }

  1005. 

  1006.     if (ff_h264_frame_start(h) < 0)

  1007.         return -1;

  1008. 

  1009.     if (s->pict_type == AV_PICTURE_TYPE_B) {

  1010.         h->frame_num_offset = (h->slice_num - h->prev_frame_num);

  1011. 

  1012.         if (h->frame_num_offset < 0) {

  1013.             h->frame_num_offset += 256;

  1014.         }

  1015.         if (h->frame_num_offset == 0 || h->frame_num_offset >= h->prev_frame_num_offset) {

  1016.             av_log(h->s.avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  1017.             return -1;

  1018.         }

  1019.     } else {

  1020.         h->prev_frame_num = h->frame_num;

  1021.         h->frame_num = h->slice_num;

  1022.         h->prev_frame_num_offset = (h->frame_num - h->prev_frame_num);

  1023. 

  1024.         if (h->prev_frame_num_offset < 0) {

  1025.             h->prev_frame_num_offset += 256;

  1026.         }

  1027.     }

  1028. 

  1029.     for (m = 0; m < 2; m++){

  1030.         int i;

  1031.         for (i = 0; i < 4; i++){

  1032.             int j;

  1033.             for (j = -1; j < 4; j++)

  1034.                 h->ref_cache[m][scan8[0] + 8*i + j]= 1;

  1035.             if (i < 3)

  1036.                 h->ref_cache[m][scan8[0] + 8*i + j]= PART_NOT_AVAILABLE;

  1037.         }

  1038.     }

  1039. 

  1040.     for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  1041.         for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  1042.             h->mb_xy = s->mb_x + s->mb_y*s->mb_stride;

  1043. 

  1044.             if ( (get_bits_count(&s->gb) + 7) >= s->gb.size_in_bits &&

  1045.                 ((get_bits_count(&s->gb) & 7) == 0 || show_bits(&s->gb, (-get_bits_count(&s->gb) & 7)) == 0)) {

  1046. 

  1047.                 skip_bits(&s->gb, svq3->next_slice_index - get_bits_count(&s->gb));

  1048.                 s->gb.size_in_bits = 8*buf_size;

  1049. 

  1050.                 if (svq3_decode_slice_header(avctx))

  1051.                     return -1;

  1052. 

  1053.                 /* TODO: support s->mb_skip_run */

  1054.             }

  1055. 

  1056.             mb_type = svq3_get_ue_golomb(&s->gb);

  1057. 

  1058.             if (s->pict_type == AV_PICTURE_TYPE_I) {

  1059.                 mb_type += 8;

  1060.             } else if (s->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4) {

  1061.                 mb_type += 4;

  1062.             }

  1063.             if ((unsigned)mb_type > 33 || svq3_decode_mb(svq3, mb_type)) {

  1064.                 av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1065.                 return -1;

  1066.             }

  1067. 

  1068.             if (mb_type != 0) {

  1069.                 ff_h264_hl_decode_mb (h);

  1070.             }

  1071. 

  1072.             if (s->pict_type != AV_PICTURE_TYPE_B && !s->low_delay) {

  1073.                 s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] =

  1074.                     (s->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1075.             }

  1076.         }

  1077. 

  1078.         ff_draw_horiz_band(s, 16*s->mb_y, 16);

  1079.     }

  1080. 

  1081.     left = buf_size*8 - get_bits_count(&s->gb);

  1082. 

  1083.     if (s->mb_y != s->mb_height || s->mb_x != s->mb_width) {

  1084.         av_log(avctx, AV_LOG_INFO, "frame num %d incomplete pic x %d y %d left %d\n", avctx->frame_number, s->mb_y, s->mb_x, left);

  1085.         //av_hex_dump(stderr, buf+buf_size-8, 8);

  1086.     }

  1087. 

  1088.     if (left < 0) {

  1089.         av_log(avctx, AV_LOG_ERROR, "frame num %d left %d\n", avctx->frame_number, left);

  1090.         return -1;

  1091.     }

  1092. 

  1093.     MPV_frame_end(s);

  1094. 

  1095.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  1096.         *(AVFrame *) data = *(AVFrame *) &s->current_picture;

  1097.     } else {

  1098.         *(AVFrame *) data = *(AVFrame *) &s->last_picture;

  1099.     }

  1100. 

  1101.     /* Do not output the last pic after seeking. */

  1102.     if (s->last_picture_ptr || s->low_delay) {

  1103.         *data_size = sizeof(AVFrame);

  1104.     }

  1105. 

  1106.     return buf_size;

  1107. }

  1108. 

  1109. static int svq3_decode_end(AVCodecContext *avctx)

  1110. {

  1111.     SVQ3Context *svq3 = avctx->priv_data;

  1112.     H264Context *h = &svq3->h;

  1113.     MpegEncContext *s = &h->s;

  1114. 

  1115.     ff_h264_free_context(h);

  1116. 

  1117.     MPV_common_end(s);

  1118. 

  1119.     av_freep(&svq3->buf);

  1120.     svq3->buf_size = 0;

  1121. 

  1122.     return 0;

  1123. }

  1124. 

  1125. AVCodec ff_svq3_decoder = {

  1126.     .name           = "svq3",

  1127.     .type           = AVMEDIA_TYPE_VIDEO,

  1128.     .id             = CODEC_ID_SVQ3,

  1129.     .priv_data_size = sizeof(SVQ3Context),

  1130.     .init           = svq3_decode_init,

  1131.     .close          = svq3_decode_end,

  1132.     .decode         = svq3_decode_frame,

  1133.     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1134.     .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1135.     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_NONE},

  1136. };