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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. #define FULLPEL_MODE  1

  67. #define HALFPEL_MODE  2

  68. #define THIRDPEL_MODE 3

  69. #define PREDICT_MODE  4

  70. 

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

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

  73.          |  /|

  74.  o   o   o / o

  75.  | / |   |/  |

  76.  o   o   o   o

  77.    /

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

  79. */

  80. static const uint8_t svq3_scan[16] = {

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

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

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

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

  85. };

  86. 

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

  88.     { 0, 0 },

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

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

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

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

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

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

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

  96.     { 4, 4 }

  97. };

  98. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  112. };

  113. 

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

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

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

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

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

  119. };

  120. 

  121. static const uint32_t svq3_dequant_coeff[32] = {

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

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

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

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

  126. };

  127. 

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

  129.     const int qmul = svq3_dequant_coeff[qp];

  130. #define stride 16

  131.     int i;

  132.     int temp[16];

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

  134. 

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

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

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

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

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

  140. 

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

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

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

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

  145.     }

  146. 

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

  148.         const int offset= x_offset[i];

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

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

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

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

  153. 

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

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

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

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

  158.     }

  159. }

  160. #undef stride

  161. 

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

  163.                             int dc)

  164. {

  165.     const int qmul = svq3_dequant_coeff[qp];

  166.     int i;

  167.     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

  168. 

  169.     if (dc) {

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

  171.         block[0] = 0;

  172.     }

  173. 

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

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

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

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

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

  179. 

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

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

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

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

  184.     }

  185. 

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

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

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

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

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

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

  192. 

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

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

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

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

  197.     }

  198. }

  199. 

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

  201.                                     int index, const int type)

  202. {

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

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

  205. 

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

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

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

  209. 

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

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

  212. 

  213.           if (vlc == INVALID_VLC)

  214.               return -1;

  215. 

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

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

  218. 

  219.           if (type == 3) {

  220.               if (vlc < 3) {

  221.                   run   = 0;

  222.                   level = vlc;

  223.               } else if (vlc < 4) {

  224.                   run   = 1;

  225.                   level = 1;

  226.               } else {

  227.                   run   = (vlc & 0x3);

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

  229.               }

  230.           } else {

  231.               if (vlc < 16) {

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

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

  234.               } else if (intra) {

  235.                   run   = (vlc & 0x7);

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

  237.               } else {

  238.                   run   = (vlc & 0xF);

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

  240.               }

  241.           }

  242. 

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

  244.               return -1;

  245. 

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

  247.         }

  248. 

  249.         if (type != 2) {

  250.             break;

  251.         }

  252.     }

  253. 

  254.     return 0;

  255. }

  256. 

  257. static inline void svq3_mc_dir_part(MpegEncContext *s,

  258.                                     int x, int y, int width, int height,

  259.                                     int mx, int my, int dxy,

  260.                                     int thirdpel, int dir, int avg)

  261. {

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

  263.     uint8_t *src, *dest;

  264.     int i, emu = 0;

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

  266. 

  267.     mx += x;

  268.     my += y;

  269. 

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

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

  272. 

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

  274.             emu = 1;

  275.         }

  276. 

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

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

  279.     }

  280. 

  281.     /* form component predictions */

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

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

  284. 

  285.     if (emu) {

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

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

  288.         src = s->edge_emu_buffer;

  289.     }

  290.     if (thirdpel)

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

  292.     else

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

  294. 

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

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

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

  298.         width  = (width  >> 1);

  299.         height = (height >> 1);

  300.         blocksize++;

  301. 

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

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

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

  305. 

  306.             if (emu) {

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

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

  309.                 src = s->edge_emu_buffer;

  310.             }

  311.             if (thirdpel)

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

  313.             else

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

  315.         }

  316.     }

  317. }

  318. 

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

  320.                               int avg)

  321. {

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

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

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

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

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

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

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

  329. 

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

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

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

  333.             int dxy;

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

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

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

  337. 

  338.             if (mode != PREDICT_MODE) {

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

  340.             } else {

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

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

  343. 

  344.                 if (dir == 0) {

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

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

  347.                 } else {

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

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

  350.                 }

  351.             }

  352. 

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

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

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

  356. 

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

  358.             if (mode == PREDICT_MODE) {

  359.                 dx = dy = 0;

  360.             } else {

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

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

  363. 

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

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

  366.                     return -1;

  367.                 }

  368.             }

  369. 

  370.             /* compute motion vector */

  371.             if (mode == THIRDPEL_MODE) {

  372.                 int fx, fy;

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

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

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

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

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

  378. 

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

  380.                 mx += mx;

  381.                 my += my;

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

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

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

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

  386. 

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

  388.                 mx *= 3;

  389.                 my *= 3;

  390.             } else {

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

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

  393. 

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

  395.                 mx *= 6;

  396.                 my *= 6;

  397.             }

  398. 

  399.             /* update mv_cache */

  400.             if (mode != PREDICT_MODE) {

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

  402. 

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

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

  405. 

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

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

  408.                     }

  409.                 }

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

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

  412.                 }

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

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

  415.                 }

  416.             }

  417. 

  418.             /* write back motion vectors */

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

  420.         }

  421.     }

  422. 

  423.     return 0;

  424. }

  425. 

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

  427. {

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

  429.     int cbp = 0;

  430.     uint32_t vlc;

  431.     int8_t *top, *left;

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

  433.     const int mb_xy = h->mb_xy;

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

  435. 

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

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

  438.     h->topright_samples_available = 0xFFFF;

  439. 

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

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

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

  443. 

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

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

  446.             }

  447. 

  448.             mb_type = MB_TYPE_SKIP;

  449.         } else {

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

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

  452.                 return -1;

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

  454.                 return -1;

  455. 

  456.             mb_type = MB_TYPE_16x16;

  457.         }

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

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

  460.             mode = THIRDPEL_MODE;

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

  462.             mode = HALFPEL_MODE;

  463.         } else {

  464.             mode = FULLPEL_MODE;

  465.         }

  466. 

  467.         /* fill caches */

  468.         /* note ref_cache should contain here:

  469.             ????????

  470.             ???11111

  471.             N??11111

  472.             N??11111

  473.             N??11111

  474.         */

  475. 

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

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

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

  479.                     *(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];

  480.                 }

  481.             } else {

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

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

  484.                 }

  485.             }

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

  487.                 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));

  488.                 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);

  489. 

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

  491.                     *(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];

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

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

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

  495.                 }else

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

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

  498.                     *(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];

  499.                     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;

  500.                 }else

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

  502.             }else

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

  504. 

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

  506.                 break;

  507.         }

  508. 

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

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

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

  512.                 return -1;

  513.         } else {        /* AV_PICTURE_TYPE_B */

  514.             if (mb_type != 2) {

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

  516.                     return -1;

  517.             } else {

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

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

  520.                 }

  521.             }

  522.             if (mb_type != 1) {

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

  524.                     return -1;

  525.             } else {

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

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

  528.                 }

  529.             }

  530.         }

  531. 

  532.         mb_type = MB_TYPE_16x16;

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

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

  535. 

  536.         if (mb_type == 8) {

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

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

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

  540.                 }

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

  542.                     h->left_samples_available = 0x5F5F;

  543.                 }

  544.             }

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

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

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

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

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

  550. 

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

  552.                     h->top_samples_available = 0x33FF;

  553.                 }

  554.             }

  555. 

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

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

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

  559. 

  560.                 if (vlc >= 25){

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

  562.                     return -1;

  563.                 }

  564. 

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

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

  567. 

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

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

  570. 

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

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

  573.                     return -1;

  574.                 }

  575.             }

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

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

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

  579.             }

  580.         }

  581. 

  582.         ff_h264_write_back_intra_pred_mode(h);

  583. 

  584.         if (mb_type == 8) {

  585.             ff_h264_check_intra4x4_pred_mode(h);

  586. 

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

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

  589.         } else {

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

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

  592.             }

  593. 

  594.             h->top_samples_available  = 0x33FF;

  595.             h->left_samples_available = 0x5F5F;

  596.         }

  597. 

  598.         mb_type = MB_TYPE_INTRA4x4;

  599.     } else {                      /* INTRA16x16 */

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

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

  602. 

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

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

  605.             return -1;

  606.         }

  607. 

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

  609.         mb_type = MB_TYPE_INTRA16x16;

  610.     }

  611. 

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

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

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

  615.         }

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

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

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

  619.             }

  620.         }

  621.     }

  622.     if (!IS_INTRA4x4(mb_type)) {

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

  624.     }

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

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

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

  628.     }

  629. 

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

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

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

  633.             return -1;

  634.         }

  635. 

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

  637.     }

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

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

  640. 

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

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

  643.             return -1;

  644.         }

  645.     }

  646.     if (IS_INTRA16x16(mb_type)) {

  647.         AV_ZERO128(h->mb_luma_dc+0);

  648.         AV_ZERO128(h->mb_luma_dc+8);

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

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

  651.             return -1;

  652.         }

  653.     }

  654. 

  655.     if (cbp) {

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

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

  658. 

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

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

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

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

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

  664. 

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

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

  667.                         return -1;

  668.                     }

  669.                 }

  670.             }

  671.         }

  672. 

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

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

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

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

  677.                 return -1;

  678.               }

  679.             }

  680. 

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

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

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

  684. 

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

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

  687.                         return -1;

  688.                     }

  689.                 }

  690.             }

  691.         }

  692.     }

  693. 

  694.     h->cbp= cbp;

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

  696. 

  697.     if (IS_INTRA(mb_type)) {

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

  699.     }

  700. 

  701.     return 0;

  702. }

  703. 

  704. static int svq3_decode_slice_header(H264Context *h)

  705. {

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

  707.     const int mb_xy = h->mb_xy;

  708.     int i, header;

  709. 

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

  711. 

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

  713.         /* TODO: what? */

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

  715.         return -1;

  716.     } else {

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

  718. 

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

  720. 

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

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

  723.             return -1;

  724.     }

  725. 

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

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

  728. 

  729.         if (h->svq3_watermark_key) {

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

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

  732.         }

  733.         if (length > 0) {

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

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

  736.         }

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

  738.     }

  739. 

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

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

  742.         return -1;

  743.     }

  744. 

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

  746. 

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

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

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

  750.     } else {

  751.         skip_bits1(&s->gb);

  752.         s->mb_skip_run = 0;

  753.     }

  754. 

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

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

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

  758. 

  759.     /* unknown fields */

  760.     skip_bits1(&s->gb);

  761. 

  762.     if (h->unknown_svq3_flag) {

  763.         skip_bits1(&s->gb);

  764.     }

  765. 

  766.     skip_bits1(&s->gb);

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

  768. 

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

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

  771.     }

  772. 

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

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

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

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

  777.     }

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

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

  780. 

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

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

  783.         }

  784.     }

  785. 

  786.     return 0;

  787. }

  788. 

  789. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  790. {

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

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

  793.     int m;

  794.     unsigned char *extradata;

  795.     unsigned int size;

  796. 

  797.     if (ff_h264_decode_init(avctx) < 0)

  798.         return -1;

  799. 

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

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

  802.     s->unrestricted_mv = 1;

  803.     h->is_complex=1;

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

  805. 

  806.     if (!s->context_initialized) {

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

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

  809.         h->halfpel_flag      = 1;

  810.         h->thirdpel_flag     = 1;

  811.         h->unknown_svq3_flag = 0;

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

  813. 

  814.         if (MPV_common_init(s) < 0)

  815.             return -1;

  816. 

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

  818. 

  819.         ff_h264_alloc_tables(h);

  820. 

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

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

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

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

  825.                 break;

  826.             extradata++;

  827.         }

  828. 

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

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

  831. 

  832.             GetBitContext gb;

  833.             int frame_size_code;

  834. 

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

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

  837. 

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

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

  840.             switch (frame_size_code) {

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

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

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

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

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

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

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

  848.                 case 7:

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

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

  851.                     break;

  852.             }

  853. 

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

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

  856. 

  857.             /* unknown fields */

  858.             skip_bits1(&gb);

  859.             skip_bits1(&gb);

  860.             skip_bits1(&gb);

  861.             skip_bits1(&gb);

  862. 

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

  864. 

  865.             /* unknown field */

  866.             skip_bits1(&gb);

  867. 

  868.             while (get_bits1(&gb)) {

  869.                 skip_bits(&gb, 8);

  870.             }

  871. 

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

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

  874.             if (h->unknown_svq3_flag) {

  875. #if CONFIG_ZLIB

  876.                 unsigned watermark_width  = svq3_get_ue_golomb(&gb);

  877.                 unsigned watermark_height = svq3_get_ue_golomb(&gb);

  878.                 int u1 = svq3_get_ue_golomb(&gb);

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

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

  881.                 int u4 = svq3_get_ue_golomb(&gb);

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

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

  884.                 uint8_t *buf;

  885. 

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

  887.                     return -1;

  888. 

  889.                 buf = av_malloc(buf_len);

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

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

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

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

  894.                     av_free(buf);

  895.                     return -1;

  896.                 }

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

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

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

  900.                 av_free(buf);

  901. #else

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

  903.                 return -1;

  904. #endif

  905.             }

  906.         }

  907.     }

  908. 

  909.     return 0;

  910. }

  911. 

  912. static int svq3_decode_frame(AVCodecContext *avctx,

  913.                              void *data, int *data_size,

  914.                              AVPacket *avpkt)

  915. {

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

  917.     int buf_size = avpkt->size;

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

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

  920.     int m, mb_type;

  921. 

  922.     /* special case for last picture */

  923.     if (buf_size == 0) {

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

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

  926.             s->next_picture_ptr = NULL;

  927.             *data_size = sizeof(AVFrame);

  928.         }

  929.         return 0;

  930.     }

  931. 

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

  933. 

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

  935. 

  936.     if (svq3_decode_slice_header(h))

  937.         return -1;

  938. 

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

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

  941. 

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

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

  944.                av_get_picture_type_char(s->pict_type), h->halfpel_flag, h->thirdpel_flag,

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

  946.     }

  947. 

  948.     /* for skipping the frame */

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

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

  951. 

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

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

  954.         return 0;

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

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

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

  958.         return 0;

  959. 

  960.     if (s->next_p_frame_damaged) {

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

  962.             return 0;

  963.         else

  964.             s->next_p_frame_damaged = 0;

  965.     }

  966. 

  967.     if (ff_h264_frame_start(h) < 0)

  968.         return -1;

  969. 

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

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

  972. 

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

  974.             h->frame_num_offset += 256;

  975.         }

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

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

  978.             return -1;

  979.         }

  980.     } else {

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

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

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

  984. 

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

  986.             h->prev_frame_num_offset += 256;

  987.         }

  988.     }

  989. 

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

  991.         int i;

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

  993.             int j;

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

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

  996.             if (i < 3)

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

  998.         }

  999.     }

  1000. 

  1001.     for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  1002.         for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  1003.             h->mb_xy = s->mb_x + s->mb_y*s->mb_stride;

  1004. 

  1005.             if ( (get_bits_count(&s->gb) + 7) >= s->gb.size_in_bits &&

  1006.                 ((get_bits_count(&s->gb) & 7) == 0 || show_bits(&s->gb, (-get_bits_count(&s->gb) & 7)) == 0)) {

  1007. 

  1008.                 skip_bits(&s->gb, h->next_slice_index - get_bits_count(&s->gb));

  1009.                 s->gb.size_in_bits = 8*buf_size;

  1010. 

  1011.                 if (svq3_decode_slice_header(h))

  1012.                     return -1;

  1013. 

  1014.                 /* TODO: support s->mb_skip_run */

  1015.             }

  1016. 

  1017.             mb_type = svq3_get_ue_golomb(&s->gb);

  1018. 

  1019.             if (s->pict_type == AV_PICTURE_TYPE_I) {

  1020.                 mb_type += 8;

  1021.             } else if (s->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4) {

  1022.                 mb_type += 4;

  1023.             }

  1024.             if (mb_type > 33 || svq3_decode_mb(h, mb_type)) {

  1025.                 av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1026.                 return -1;

  1027.             }

  1028. 

  1029.             if (mb_type != 0) {

  1030.                 ff_h264_hl_decode_mb (h);

  1031.             }

  1032. 

  1033.             if (s->pict_type != AV_PICTURE_TYPE_B && !s->low_delay) {

  1034.                 s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] =

  1035.                     (s->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1036.             }

  1037.         }

  1038. 

  1039.         ff_draw_horiz_band(s, 16*s->mb_y, 16);

  1040.     }

  1041. 

  1042.     MPV_frame_end(s);

  1043. 

  1044.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  1045.         *(AVFrame *) data = *(AVFrame *) &s->current_picture;

  1046.     } else {

  1047.         *(AVFrame *) data = *(AVFrame *) &s->last_picture;

  1048.     }

  1049. 

  1050.     /* Do not output the last pic after seeking. */

  1051.     if (s->last_picture_ptr || s->low_delay) {

  1052.         *data_size = sizeof(AVFrame);

  1053.     }

  1054. 

  1055.     return buf_size;

  1056. }

  1057. 

  1058. 

  1059. AVCodec ff_svq3_decoder = {

  1060.     "svq3",

  1061.     AVMEDIA_TYPE_VIDEO,

  1062.     CODEC_ID_SVQ3,

  1063.     sizeof(H264Context),

  1064.     svq3_decode_init,

  1065.     NULL,

  1066.     ff_h264_decode_end,

  1067.     svq3_decode_frame,

  1068.     CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1069.     .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1070.     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_NONE},

  1071. };