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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. 

  43. #include <inttypes.h>

  44. 

  45. #include "libavutil/attributes.h"

  46. #include "internal.h"

  47. #include "avcodec.h"

  48. #include "mpegutils.h"

  49. #include "h264.h"

  50. 

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

  52. 

  53. #include "h264_mvpred.h"

  54. #include "golomb.h"

  55. #include "hpeldsp.h"

  56. #include "rectangle.h"

  57. #include "tpeldsp.h"

  58. 

  59. #if CONFIG_ZLIB

  60. #include <zlib.h>

  61. #endif

  62. 

  63. #include "svq1.h"

  64. #include "svq3.h"

  65. 

  66. /**

  67.  * @file

  68.  * svq3 decoder.

  69.  */

  70. 

  71. typedef struct SVQ3Context {

  72.     H264Context h;

  73.     HpelDSPContext hdsp;

  74.     TpelDSPContext tdsp;

  75.     H264Picture *cur_pic;

  76.     H264Picture *next_pic;

  77.     H264Picture *last_pic;

  78.     int halfpel_flag;

  79.     int thirdpel_flag;

  80.     int unknown_flag;

  81.     int next_slice_index;

  82.     uint32_t watermark_key;

  83.     int adaptive_quant;

  84.     int next_p_frame_damaged;

  85.     int h_edge_pos;

  86.     int v_edge_pos;

  87.     int last_frame_output;

  88. } SVQ3Context;

  89. 

  90. #define FULLPEL_MODE  1

  91. #define HALFPEL_MODE  2

  92. #define THIRDPEL_MODE 3

  93. #define PREDICT_MODE  4

  94. 

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

  96.  * o-->o-->o   o

  97.  *         |  /|

  98.  * o   o   o / o

  99.  * | / |   |/  |

  100.  * o   o   o   o

  101.  *   /

  102.  * o-->o-->o-->o

  103.  */

  104. static const uint8_t svq3_scan[16] = {

  105.     0 + 0 * 4, 1 + 0 * 4, 2 + 0 * 4, 2 + 1 * 4,

  106.     2 + 2 * 4, 3 + 0 * 4, 3 + 1 * 4, 3 + 2 * 4,

  107.     0 + 1 * 4, 0 + 2 * 4, 1 + 1 * 4, 1 + 2 * 4,

  108.     0 + 3 * 4, 1 + 3 * 4, 2 + 3 * 4, 3 + 3 * 4,

  109. };

  110. 

  111. static const uint8_t luma_dc_zigzag_scan[16] = {

  112.     0 * 16 + 0 * 64, 1 * 16 + 0 * 64, 2 * 16 + 0 * 64, 0 * 16 + 2 * 64,

  113.     3 * 16 + 0 * 64, 0 * 16 + 1 * 64, 1 * 16 + 1 * 64, 2 * 16 + 1 * 64,

  114.     1 * 16 + 2 * 64, 2 * 16 + 2 * 64, 3 * 16 + 2 * 64, 0 * 16 + 3 * 64,

  115.     3 * 16 + 1 * 64, 1 * 16 + 3 * 64, 2 * 16 + 3 * 64, 3 * 16 + 3 * 64,

  116. };

  117. 

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

  119.     { 0, 0 },

  120.     { 1, 0 }, { 0, 1 },

  121.     { 0, 2 }, { 1, 1 }, { 2, 0 },

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

  123.     { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

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

  125.     { 2, 4 }, { 3, 3 }, { 4, 2 },

  126.     { 4, 3 }, { 3, 4 },

  127.     { 4, 4 }

  128. };

  129. 

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

  131.     { { 2, -1, -1, -1, -1 }, { 2, 1, -1, -1, -1 }, { 1, 2, -1, -1, -1 },

  132.       { 2,  1, -1, -1, -1 }, { 1, 2, -1, -1, -1 }, { 1, 2, -1, -1, -1 } },

  133.     { { 0,  2, -1, -1, -1 }, { 0, 2,  1,  4,  3 }, { 0, 1,  2,  4,  3 },

  134.       { 0,  2,  1,  4,  3 }, { 2, 0,  1,  3,  4 }, { 0, 4,  2,  1,  3 } },

  135.     { { 2,  0, -1, -1, -1 }, { 2, 1,  0,  4,  3 }, { 1, 2,  4,  0,  3 },

  136.       { 2,  1,  0,  4,  3 }, { 2, 1,  4,  3,  0 }, { 1, 2,  4,  0,  3 } },

  137.     { { 2,  0, -1, -1, -1 }, { 2, 0,  1,  4,  3 }, { 1, 2,  0,  4,  3 },

  138.       { 2,  1,  0,  4,  3 }, { 2, 1,  3,  4,  0 }, { 2, 4,  1,  0,  3 } },

  139.     { { 0,  2, -1, -1, -1 }, { 0, 2,  1,  3,  4 }, { 1, 2,  3,  0,  4 },

  140.       { 2,  0,  1,  3,  4 }, { 2, 1,  3,  0,  4 }, { 2, 0,  4,  3,  1 } },

  141.     { { 0,  2, -1, -1, -1 }, { 0, 2,  4,  1,  3 }, { 1, 4,  2,  0,  3 },

  142.       { 4,  2,  0,  1,  3 }, { 2, 0,  1,  4,  3 }, { 4, 2,  1,  0,  3 } },

  143. };

  144. 

  145. static const struct {

  146.     uint8_t run;

  147.     uint8_t level;

  148. } svq3_dct_tables[2][16] = {

  149.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  150.       { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  151.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  152.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  153. };

  154. 

  155. static const uint32_t svq3_dequant_coeff[32] = {

  156.      3881,  4351,  4890,  5481,   6154,   6914,   7761,   8718,

  157.      9781, 10987, 12339, 13828,  15523,  17435,  19561,  21873,

  158.     24552, 27656, 30847, 34870,  38807,  43747,  49103,  54683,

  159.     61694, 68745, 77615, 89113, 100253, 109366, 126635, 141533

  160. };

  161. 

  162. void ff_svq3_luma_dc_dequant_idct_c(int16_t *output, int16_t *input, int qp)

  163. {

  164.     const int qmul = svq3_dequant_coeff[qp];

  165. #define stride 16

  166.     int i;

  167.     int temp[16];

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

  169. 

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

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

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

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

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

  175. 

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

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

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

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

  180.     }

  181. 

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

  183.         const int offset = x_offset[i];

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

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

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

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

  188. 

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

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

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

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

  193.     }

  194. }

  195. #undef stride

  196. 

  197. void ff_svq3_add_idct_c(uint8_t *dst, int16_t *block,

  198.                         int stride, int qp, int dc)

  199. {

  200.     const int qmul = svq3_dequant_coeff[qp];

  201.     int i;

  202. 

  203.     if (dc) {

  204.         dc       = 13 * 13 * (dc == 1 ? 1538 * block[0]

  205.                                       : qmul * (block[0] >> 3) / 2);

  206.         block[0] = 0;

  207.     }

  208. 

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

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

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

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

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

  214. 

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

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

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

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

  219.     }

  220. 

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

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

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

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

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

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

  227. 

  228.         dst[i + stride * 0] = av_clip_uint8(dst[i + stride * 0] + ((z0 + z3) * qmul + rr >> 20));

  229.         dst[i + stride * 1] = av_clip_uint8(dst[i + stride * 1] + ((z1 + z2) * qmul + rr >> 20));

  230.         dst[i + stride * 2] = av_clip_uint8(dst[i + stride * 2] + ((z1 - z2) * qmul + rr >> 20));

  231.         dst[i + stride * 3] = av_clip_uint8(dst[i + stride * 3] + ((z0 - z3) * qmul + rr >> 20));

  232.     }

  233. 

  234.     memset(block, 0, 16 * sizeof(int16_t));

  235. }

  236. 

  237. static inline int svq3_decode_block(GetBitContext *gb, int16_t *block,

  238.                                     int index, const int type)

  239. {

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

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

  242. 

  243.     int run, level, limit;

  244.     unsigned vlc;

  245.     const int intra           = 3 * type >> 2;

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

  247. 

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

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

  250.             int sign = (vlc & 1) ? 0 : -1;

  251.             vlc      = vlc + 1 >> 1;

  252. 

  253.             if (type == 3) {

  254.                 if (vlc < 3) {

  255.                     run   = 0;

  256.                     level = vlc;

  257.                 } else if (vlc < 4) {

  258.                     run   = 1;

  259.                     level = 1;

  260.                 } else {

  261.                     run   = vlc & 0x3;

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

  263.                 }

  264.             } else {

  265.                 if (vlc < 16) {

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

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

  268.                 } else if (intra) {

  269.                     run   = vlc & 0x7;

  270.                     level = (vlc >> 3) +

  271.                             ((run == 0) ? 8 : ((run < 2) ? 2 : ((run < 5) ? 0 : -1)));

  272.                 } else {

  273.                     run   = vlc & 0xF;

  274.                     level = (vlc >> 4) +

  275.                             ((run == 0) ? 4 : ((run < 3) ? 2 : ((run < 10) ? 1 : 0)));

  276.                 }

  277.             }

  278. 

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

  280.                 return -1;

  281. 

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

  283.         }

  284. 

  285.         if (type != 2) {

  286.             break;

  287.         }

  288.     }

  289. 

  290.     return 0;

  291. }

  292. 

  293. static inline void svq3_mc_dir_part(SVQ3Context *s,

  294.                                     int x, int y, int width, int height,

  295.                                     int mx, int my, int dxy,

  296.                                     int thirdpel, int dir, int avg)

  297. {

  298.     H264Context *h = &s->h;

  299.     const H264Picture *pic = (dir == 0) ? s->last_pic : s->next_pic;

  300.     uint8_t *src, *dest;

  301.     int i, emu = 0;

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

  303. 

  304.     mx += x;

  305.     my += y;

  306. 

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

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

  309.         emu = 1;

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

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

  312.     }

  313. 

  314.     /* form component predictions */

  315.     dest = h->cur_pic.f.data[0] + x + y * h->linesize;

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

  317. 

  318.     if (emu) {

  319.         h->vdsp.emulated_edge_mc(h->edge_emu_buffer, src,

  320.                                  h->linesize, h->linesize,

  321.                                  width + 1, height + 1,

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

  323.         src = h->edge_emu_buffer;

  324.     }

  325.     if (thirdpel)

  326.         (avg ? s->tdsp.avg_tpel_pixels_tab

  327.              : s->tdsp.put_tpel_pixels_tab)[dxy](dest, src, h->linesize,

  328.                                                  width, height);

  329.     else

  330.         (avg ? s->hdsp.avg_pixels_tab

  331.              : s->hdsp.put_pixels_tab)[blocksize][dxy](dest, src, h->linesize,

  332.                                                        height);

  333. 

  334.     if (!(h->flags & CODEC_FLAG_GRAY)) {

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

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

  337.         width  = width  >> 1;

  338.         height = height >> 1;

  339.         blocksize++;

  340. 

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

  342.             dest = h->cur_pic.f.data[i] + (x >> 1) + (y >> 1) * h->uvlinesize;

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

  344. 

  345.             if (emu) {

  346.                 h->vdsp.emulated_edge_mc(h->edge_emu_buffer, src,

  347.                                          h->uvlinesize, h->uvlinesize,

  348.                                          width + 1, height + 1,

  349.                                          mx, my, (s->h_edge_pos >> 1),

  350.                                          s->v_edge_pos >> 1);

  351.                 src = h->edge_emu_buffer;

  352.             }

  353.             if (thirdpel)

  354.                 (avg ? s->tdsp.avg_tpel_pixels_tab

  355.                      : s->tdsp.put_tpel_pixels_tab)[dxy](dest, src,

  356.                                                          h->uvlinesize,

  357.                                                          width, height);

  358.             else

  359.                 (avg ? s->hdsp.avg_pixels_tab

  360.                      : s->hdsp.put_pixels_tab)[blocksize][dxy](dest, src,

  361.                                                                h->uvlinesize,

  362.                                                                height);

  363.         }

  364.     }

  365. }

  366. 

  367. static inline int svq3_mc_dir(SVQ3Context *s, int size, int mode,

  368.                               int dir, int avg)

  369. {

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

  371.     H264Context *h          = &s->h;

  372.     H264SliceContext *sl    = &h->slice_ctx[0];

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

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

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

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

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

  378. 

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

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

  381.             const int b_xy = (4 * h->mb_x + (j >> 2)) +

  382.                              (4 * h->mb_y + (i >> 2)) * h->b_stride;

  383.             int dxy;

  384.             x = 16 * h->mb_x + j;

  385.             y = 16 * h->mb_y + i;

  386.             k = (j >> 2 & 1) + (i >> 1 & 2) +

  387.                 (j >> 1 & 4) + (i      & 8);

  388. 

  389.             if (mode != PREDICT_MODE) {

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

  391.             } else {

  392.                 mx = s->next_pic->motion_val[0][b_xy][0] << 1;

  393.                 my = s->next_pic->motion_val[0][b_xy][1] << 1;

  394. 

  395.                 if (dir == 0) {

  396.                     mx = mx * h->frame_num_offset /

  397.                          h->prev_frame_num_offset + 1 >> 1;

  398.                     my = my * h->frame_num_offset /

  399.                          h->prev_frame_num_offset + 1 >> 1;

  400.                 } else {

  401.                     mx = mx * (h->frame_num_offset - h->prev_frame_num_offset) /

  402.                          h->prev_frame_num_offset + 1 >> 1;

  403.                     my = my * (h->frame_num_offset - h->prev_frame_num_offset) /

  404.                          h->prev_frame_num_offset + 1 >> 1;

  405.                 }

  406.             }

  407. 

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

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

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

  411. 

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

  413.             if (mode == PREDICT_MODE) {

  414.                 dx = dy = 0;

  415.             } else {

  416.                 dy = svq3_get_se_golomb(&h->gb);

  417.                 dx = svq3_get_se_golomb(&h->gb);

  418. 

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

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

  421.                     return -1;

  422.                 }

  423.             }

  424. 

  425.             /* compute motion vector */

  426.             if (mode == THIRDPEL_MODE) {

  427.                 int fx, fy;

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

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

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

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

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

  433. 

  434.                 svq3_mc_dir_part(s, x, y, part_width, part_height,

  435.                                  fx, fy, dxy, 1, dir, avg);

  436.                 mx += mx;

  437.                 my += my;

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

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

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

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

  442. 

  443.                 svq3_mc_dir_part(s, x, y, part_width, part_height,

  444.                                  mx >> 1, my >> 1, dxy, 0, dir, avg);

  445.                 mx *= 3;

  446.                 my *= 3;

  447.             } else {

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

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

  450. 

  451.                 svq3_mc_dir_part(s, x, y, part_width, part_height,

  452.                                  mx, my, 0, 0, dir, avg);

  453.                 mx *= 6;

  454.                 my *= 6;

  455.             }

  456. 

  457.             /* update mv_cache */

  458.             if (mode != PREDICT_MODE) {

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

  460. 

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

  462.                     AV_WN32A(sl->mv_cache[dir][scan8[k] + 1 * 8], mv);

  463. 

  464.                     if (part_width == 8 && j < 8)

  465.                         AV_WN32A(sl->mv_cache[dir][scan8[k] + 1 + 1 * 8], mv);

  466.                 }

  467.                 if (part_width == 8 && j < 8)

  468.                     AV_WN32A(sl->mv_cache[dir][scan8[k] + 1], mv);

  469.                 if (part_width == 4 || part_height == 4)

  470.                     AV_WN32A(sl->mv_cache[dir][scan8[k]], mv);

  471.             }

  472. 

  473.             /* write back motion vectors */

  474.             fill_rectangle(h->cur_pic.motion_val[dir][b_xy],

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

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

  477.         }

  478. 

  479.     return 0;

  480. }

  481. 

  482. static int svq3_decode_mb(SVQ3Context *s, unsigned int mb_type)

  483. {

  484.     H264Context *h = &s->h;

  485.     H264SliceContext *sl = &h->slice_ctx[0];

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

  487.     int cbp = 0;

  488.     uint32_t vlc;

  489.     int8_t *top, *left;

  490.     const int mb_xy         = h->mb_xy;

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

  492. 

  493.     sl->top_samples_available      = (h->mb_y == 0) ? 0x33FF : 0xFFFF;

  494.     sl->left_samples_available     = (h->mb_x == 0) ? 0x5F5F : 0xFFFF;

  495.     sl->topright_samples_available = 0xFFFF;

  496. 

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

  498.         if (h->pict_type == AV_PICTURE_TYPE_P ||

  499.             s->next_pic->mb_type[mb_xy] == -1) {

  500.             svq3_mc_dir_part(s, 16 * h->mb_x, 16 * h->mb_y, 16, 16,

  501.                              0, 0, 0, 0, 0, 0);

  502. 

  503.             if (h->pict_type == AV_PICTURE_TYPE_B)

  504.                 svq3_mc_dir_part(s, 16 * h->mb_x, 16 * h->mb_y, 16, 16,

  505.                                  0, 0, 0, 0, 1, 1);

  506. 

  507.             mb_type = MB_TYPE_SKIP;

  508.         } else {

  509.             mb_type = FFMIN(s->next_pic->mb_type[mb_xy], 6);

  510.             if (svq3_mc_dir(s, mb_type, PREDICT_MODE, 0, 0) < 0)

  511.                 return -1;

  512.             if (svq3_mc_dir(s, mb_type, PREDICT_MODE, 1, 1) < 0)

  513.                 return -1;

  514. 

  515.             mb_type = MB_TYPE_16x16;

  516.         }

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

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

  519.             mode = THIRDPEL_MODE;

  520.         else if (s->halfpel_flag &&

  521.                  s->thirdpel_flag == !get_bits1(&h->gb))

  522.             mode = HALFPEL_MODE;

  523.         else

  524.             mode = FULLPEL_MODE;

  525. 

  526.         /* fill caches */

  527.         /* note ref_cache should contain here:

  528.          *  ????????

  529.          *  ???11111

  530.          *  N??11111

  531.          *  N??11111

  532.          *  N??11111

  533.          */

  534. 

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

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

  537.                 for (i = 0; i < 4; i++)

  538.                     AV_COPY32(sl->mv_cache[m][scan8[0] - 1 + i * 8],

  539.                               h->cur_pic.motion_val[m][b_xy - 1 + i * h->b_stride]);

  540.             } else {

  541.                 for (i = 0; i < 4; i++)

  542.                     AV_ZERO32(sl->mv_cache[m][scan8[0] - 1 + i * 8]);

  543.             }

  544.             if (h->mb_y > 0) {

  545.                 memcpy(sl->mv_cache[m][scan8[0] - 1 * 8],

  546.                        h->cur_pic.motion_val[m][b_xy - h->b_stride],

  547.                        4 * 2 * sizeof(int16_t));

  548.                 memset(&sl->ref_cache[m][scan8[0] - 1 * 8],

  549.                        (sl->intra4x4_pred_mode[h->mb2br_xy[mb_xy - h->mb_stride]] == -1) ? PART_NOT_AVAILABLE : 1, 4);

  550. 

  551.                 if (h->mb_x < h->mb_width - 1) {

  552.                     AV_COPY32(sl->mv_cache[m][scan8[0] + 4 - 1 * 8],

  553.                               h->cur_pic.motion_val[m][b_xy - h->b_stride + 4]);

  554.                     sl->ref_cache[m][scan8[0] + 4 - 1 * 8] =

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

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

  557.                 } else

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

  559.                 if (h->mb_x > 0) {

  560.                     AV_COPY32(sl->mv_cache[m][scan8[0] - 1 - 1 * 8],

  561.                               h->cur_pic.motion_val[m][b_xy - h->b_stride - 1]);

  562.                     sl->ref_cache[m][scan8[0] - 1 - 1 * 8] =

  563.                         (sl->intra4x4_pred_mode[h->mb2br_xy[mb_xy - h->mb_stride - 1] + 3] == -1) ? PART_NOT_AVAILABLE : 1;

  564.                 } else

  565.                     sl->ref_cache[m][scan8[0] - 1 - 1 * 8] = PART_NOT_AVAILABLE;

  566.             } else

  567.                 memset(&sl->ref_cache[m][scan8[0] - 1 * 8 - 1],

  568.                        PART_NOT_AVAILABLE, 8);

  569. 

  570.             if (h->pict_type != AV_PICTURE_TYPE_B)

  571.                 break;

  572.         }

  573. 

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

  575.         if (h->pict_type == AV_PICTURE_TYPE_P) {

  576.             if (svq3_mc_dir(s, mb_type - 1, mode, 0, 0) < 0)

  577.                 return -1;

  578.         } else {        /* AV_PICTURE_TYPE_B */

  579.             if (mb_type != 2) {

  580.                 if (svq3_mc_dir(s, 0, mode, 0, 0) < 0)

  581.                     return -1;

  582.             } else {

  583.                 for (i = 0; i < 4; i++)

  584.                     memset(h->cur_pic.motion_val[0][b_xy + i * h->b_stride],

  585.                            0, 4 * 2 * sizeof(int16_t));

  586.             }

  587.             if (mb_type != 1) {

  588.                 if (svq3_mc_dir(s, 0, mode, 1, mb_type == 3) < 0)

  589.                     return -1;

  590.             } else {

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

  592.                     memset(h->cur_pic.motion_val[1][b_xy + i * h->b_stride],

  593.                            0, 4 * 2 * sizeof(int16_t));

  594.             }

  595.         }

  596. 

  597.         mb_type = MB_TYPE_16x16;

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

  599.         memset(sl->intra4x4_pred_mode_cache, -1, 8 * 5 * sizeof(int8_t));

  600. 

  601.         if (mb_type == 8) {

  602.             if (h->mb_x > 0) {

  603.                 for (i = 0; i < 4; i++)

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

  605.                 if (sl->intra4x4_pred_mode_cache[scan8[0] - 1] == -1)

  606.                     sl->left_samples_available = 0x5F5F;

  607.             }

  608.             if (h->mb_y > 0) {

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

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

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

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

  613. 

  614.                 if (sl->intra4x4_pred_mode_cache[4 + 8 * 0] == -1)

  615.                     sl->top_samples_available = 0x33FF;

  616.             }

  617. 

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

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

  620.                 vlc = svq3_get_ue_golomb(&h->gb);

  621. 

  622.                 if (vlc >= 25) {

  623.                     av_log(h->avctx, AV_LOG_ERROR,

  624.                            "luma prediction:%"PRIu32"\n", vlc);

  625.                     return -1;

  626.                 }

  627. 

  628.                 left = &sl->intra4x4_pred_mode_cache[scan8[i] - 1];

  629.                 top  = &sl->intra4x4_pred_mode_cache[scan8[i] - 8];

  630. 

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

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

  633. 

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

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

  636.                     return -1;

  637.                 }

  638.             }

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

  640.             for (i = 0; i < 4; i++)

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

  642.         }

  643. 

  644.         write_back_intra_pred_mode(h, sl);

  645. 

  646.         if (mb_type == 8) {

  647.             ff_h264_check_intra4x4_pred_mode(h, sl);

  648. 

  649.             sl->top_samples_available  = (h->mb_y == 0) ? 0x33FF : 0xFFFF;

  650.             sl->left_samples_available = (h->mb_x == 0) ? 0x5F5F : 0xFFFF;

  651.         } else {

  652.             for (i = 0; i < 4; i++)

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

  654. 

  655.             sl->top_samples_available  = 0x33FF;

  656.             sl->left_samples_available = 0x5F5F;

  657.         }

  658. 

  659.         mb_type = MB_TYPE_INTRA4x4;

  660.     } else {                      /* INTRA16x16 */

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

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

  663. 

  664.         if ((sl->intra16x16_pred_mode = ff_h264_check_intra_pred_mode(h, sl, dir, 0)) < 0) {

  665.             av_log(h->avctx, AV_LOG_ERROR, "ff_h264_check_intra_pred_mode < 0\n");

  666.             return sl->intra16x16_pred_mode;

  667.         }

  668. 

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

  670.         mb_type = MB_TYPE_INTRA16x16;

  671.     }

  672. 

  673.     if (!IS_INTER(mb_type) && h->pict_type != AV_PICTURE_TYPE_I) {

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

  675.             memset(h->cur_pic.motion_val[0][b_xy + i * h->b_stride],

  676.                    0, 4 * 2 * sizeof(int16_t));

  677.         if (h->pict_type == AV_PICTURE_TYPE_B) {

  678.             for (i = 0; i < 4; i++)

  679.                 memset(h->cur_pic.motion_val[1][b_xy + i * h->b_stride],

  680.                        0, 4 * 2 * sizeof(int16_t));

  681.         }

  682.     }

  683.     if (!IS_INTRA4x4(mb_type)) {

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

  685.     }

  686.     if (!IS_SKIP(mb_type) || h->pict_type == AV_PICTURE_TYPE_B) {

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

  688.     }

  689. 

  690.     if (!IS_INTRA16x16(mb_type) &&

  691.         (!IS_SKIP(mb_type) || h->pict_type == AV_PICTURE_TYPE_B)) {

  692.         if ((vlc = svq3_get_ue_golomb(&h->gb)) >= 48) {

  693.             av_log(h->avctx, AV_LOG_ERROR, "cbp_vlc=%"PRIu32"\n", vlc);

  694.             return -1;

  695.         }

  696. 

  697.         cbp = IS_INTRA(mb_type) ? golomb_to_intra4x4_cbp[vlc]

  698.                                 : golomb_to_inter_cbp[vlc];

  699.     }

  700.     if (IS_INTRA16x16(mb_type) ||

  701.         (h->pict_type != AV_PICTURE_TYPE_I && s->adaptive_quant && cbp)) {

  702.         sl->qscale += svq3_get_se_golomb(&h->gb);

  703. 

  704.         if (sl->qscale > 31u) {

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

  706.             return -1;

  707.         }

  708.     }

  709.     if (IS_INTRA16x16(mb_type)) {

  710.         AV_ZERO128(sl->mb_luma_dc[0] + 0);

  711.         AV_ZERO128(sl->mb_luma_dc[0] + 8);

  712.         if (svq3_decode_block(&h->gb, sl->mb_luma_dc[0], 0, 1)) {

  713.             av_log(h->avctx, AV_LOG_ERROR,

  714.                    "error while decoding intra luma dc\n");

  715.             return -1;

  716.         }

  717.     }

  718. 

  719.     if (cbp) {

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

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

  722. 

  723.         for (i = 0; i < 4; i++)

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

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

  726.                     k = index ? (1 * (j & 1) + 2 * (i & 1) +

  727.                                  2 * (j & 2) + 4 * (i & 2))

  728.                               : (4 * i + j);

  729.                     sl->non_zero_count_cache[scan8[k]] = 1;

  730. 

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

  732.                         av_log(h->avctx, AV_LOG_ERROR,

  733.                                "error while decoding block\n");

  734.                         return -1;

  735.                     }

  736.                 }

  737.             }

  738. 

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

  740.             for (i = 1; i < 3; ++i)

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

  742.                     av_log(h->avctx, AV_LOG_ERROR,

  743.                            "error while decoding chroma dc block\n");

  744.                     return -1;

  745.                 }

  746. 

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

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

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

  750.                         k                                 = 16 * i + j;

  751.                         sl->non_zero_count_cache[scan8[k]] = 1;

  752. 

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

  754.                             av_log(h->avctx, AV_LOG_ERROR,

  755.                                    "error while decoding chroma ac block\n");

  756.                             return -1;

  757.                         }

  758.                     }

  759.                 }

  760.             }

  761.         }

  762.     }

  763. 

  764.     sl->cbp                   = cbp;

  765.     h->cur_pic.mb_type[mb_xy] = mb_type;

  766. 

  767.     if (IS_INTRA(mb_type))

  768.         sl->chroma_pred_mode = ff_h264_check_intra_pred_mode(h, sl, DC_PRED8x8, 1);

  769. 

  770.     return 0;

  771. }

  772. 

  773. static int svq3_decode_slice_header(AVCodecContext *avctx)

  774. {

  775.     SVQ3Context *s = avctx->priv_data;

  776.     H264Context *h    = &s->h;

  777.     H264SliceContext *sl = &h->slice_ctx[0];

  778.     const int mb_xy   = h->mb_xy;

  779.     int i, header;

  780.     unsigned slice_id;

  781. 

  782.     header = get_bits(&h->gb, 8);

  783. 

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

  785.         /* TODO: what? */

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

  787.         return -1;

  788.     } else {

  789.         int length = header >> 5 & 3;

  790. 

  791.         s->next_slice_index = get_bits_count(&h->gb) +

  792.                               8 * show_bits(&h->gb, 8 * length) +

  793.                               8 * length;

  794. 

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

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

  797.             return -1;

  798.         }

  799. 

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

  801.         skip_bits(&h->gb, 8);

  802. 

  803.         if (s->watermark_key) {

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

  805.             AV_WL32(&h->gb.buffer[(get_bits_count(&h->gb) >> 3) + 1],

  806.                     header ^ s->watermark_key);

  807.         }

  808.         if (length > 0) {

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

  810.                    &h->gb.buffer[h->gb.size_in_bits >> 3], length - 1);

  811.         }

  812.         skip_bits_long(&h->gb, 0);

  813.     }

  814. 

  815.     if ((slice_id = svq3_get_ue_golomb(&h->gb)) >= 3) {

  816.         av_log(h->avctx, AV_LOG_ERROR, "illegal slice type %u \n", slice_id);

  817.         return -1;

  818.     }

  819. 

  820.     sl->slice_type = golomb_to_pict_type[slice_id];

  821. 

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

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

  824.         sl->mb_skip_run = get_bits(&h->gb, i) -

  825.                          (h->mb_y * h->mb_width + h->mb_x);

  826.     } else {

  827.         skip_bits1(&h->gb);

  828.         sl->mb_skip_run = 0;

  829.     }

  830. 

  831.     sl->slice_num     = get_bits(&h->gb, 8);

  832.     sl->qscale        = get_bits(&h->gb, 5);

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

  834. 

  835.     /* unknown fields */

  836.     skip_bits1(&h->gb);

  837. 

  838.     if (s->unknown_flag)

  839.         skip_bits1(&h->gb);

  840. 

  841.     skip_bits1(&h->gb);

  842.     skip_bits(&h->gb, 2);

  843. 

  844.     while (get_bits1(&h->gb))

  845.         skip_bits(&h->gb, 8);

  846. 

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

  848.     if (h->mb_x > 0) {

  849.         memset(sl->intra4x4_pred_mode + h->mb2br_xy[mb_xy - 1] + 3,

  850.                -1, 4 * sizeof(int8_t));

  851.         memset(sl->intra4x4_pred_mode + h->mb2br_xy[mb_xy - h->mb_x],

  852.                -1, 8 * sizeof(int8_t) * h->mb_x);

  853.     }

  854.     if (h->mb_y > 0) {

  855.         memset(sl->intra4x4_pred_mode + h->mb2br_xy[mb_xy - h->mb_stride],

  856.                -1, 8 * sizeof(int8_t) * (h->mb_width - h->mb_x));

  857. 

  858.         if (h->mb_x > 0)

  859.             sl->intra4x4_pred_mode[h->mb2br_xy[mb_xy - h->mb_stride - 1] + 3] = -1;

  860.     }

  861. 

  862.     return 0;

  863. }

  864. 

  865. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  866. {

  867.     SVQ3Context *s = avctx->priv_data;

  868.     H264Context *h = &s->h;

  869.     H264SliceContext *sl;

  870.     int m;

  871.     unsigned char *extradata;

  872.     unsigned char *extradata_end;

  873.     unsigned int size;

  874.     int marker_found = 0;

  875. 

  876.     s->cur_pic  = av_mallocz(sizeof(*s->cur_pic));

  877.     s->last_pic = av_mallocz(sizeof(*s->last_pic));

  878.     s->next_pic = av_mallocz(sizeof(*s->next_pic));

  879.     if (!s->next_pic || !s->last_pic || !s->cur_pic) {

  880.         av_freep(&s->cur_pic);

  881.         av_freep(&s->last_pic);

  882.         av_freep(&s->next_pic);

  883.         return AVERROR(ENOMEM);

  884.     }

  885. 

  886.     if (ff_h264_decode_init(avctx) < 0)

  887.         return -1;

  888. 

  889.     ff_hpeldsp_init(&s->hdsp, avctx->flags);

  890.     ff_tpeldsp_init(&s->tdsp);

  891. 

  892.     sl = h->slice_ctx;

  893. 

  894.     h->flags           = avctx->flags;

  895.     sl->is_complex     = 1;

  896.     h->picture_structure = PICT_FRAME;

  897.     avctx->pix_fmt     = AV_PIX_FMT_YUVJ420P;

  898.     avctx->color_range = AVCOL_RANGE_JPEG;

  899. 

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

  901.     h->chroma_x_shift = h->chroma_y_shift = 1;

  902. 

  903.     s->halfpel_flag  = 1;

  904.     s->thirdpel_flag = 1;

  905.     s->unknown_flag  = 0;

  906. 

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

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

  909.     extradata_end = avctx->extradata + avctx->extradata_size;

  910.     if (extradata) {

  911.         for (m = 0; m + 8 < avctx->extradata_size; m++) {

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

  913.                 marker_found = 1;

  914.                 break;

  915.             }

  916.             extradata++;

  917.         }

  918.     }

  919. 

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

  921.     if (marker_found) {

  922.         GetBitContext gb;

  923.         int frame_size_code;

  924. 

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

  926.         if (size > extradata_end - extradata - 8)

  927.             return AVERROR_INVALIDDATA;

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

  929. 

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

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

  932.         switch (frame_size_code) {

  933.         case 0:

  934.             avctx->width  = 160;

  935.             avctx->height = 120;

  936.             break;

  937.         case 1:

  938.             avctx->width  = 128;

  939.             avctx->height =  96;

  940.             break;

  941.         case 2:

  942.             avctx->width  = 176;

  943.             avctx->height = 144;

  944.             break;

  945.         case 3:

  946.             avctx->width  = 352;

  947.             avctx->height = 288;

  948.             break;

  949.         case 4:

  950.             avctx->width  = 704;

  951.             avctx->height = 576;

  952.             break;

  953.         case 5:

  954.             avctx->width  = 240;

  955.             avctx->height = 180;

  956.             break;

  957.         case 6:

  958.             avctx->width  = 320;

  959.             avctx->height = 240;

  960.             break;

  961.         case 7:

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

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

  964.             break;

  965.         }

  966. 

  967.         s->halfpel_flag  = get_bits1(&gb);

  968.         s->thirdpel_flag = get_bits1(&gb);

  969. 

  970.         /* unknown fields */

  971.         skip_bits1(&gb);

  972.         skip_bits1(&gb);

  973.         skip_bits1(&gb);

  974.         skip_bits1(&gb);

  975. 

  976.         h->low_delay = get_bits1(&gb);

  977. 

  978.         /* unknown field */

  979.         skip_bits1(&gb);

  980. 

  981.         while (get_bits1(&gb))

  982.             skip_bits(&gb, 8);

  983. 

  984.         s->unknown_flag  = get_bits1(&gb);

  985.         avctx->has_b_frames = !h->low_delay;

  986.         if (s->unknown_flag) {

  987. #if CONFIG_ZLIB

  988.             unsigned watermark_width  = svq3_get_ue_golomb(&gb);

  989.             unsigned watermark_height = svq3_get_ue_golomb(&gb);

  990.             int u1                    = svq3_get_ue_golomb(&gb);

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

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

  993.             int u4                    = svq3_get_ue_golomb(&gb);

  994.             unsigned long buf_len     = watermark_width *

  995.                                         watermark_height * 4;

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

  997.             uint8_t *buf;

  998. 

  999.             if (watermark_height > 0 &&

  1000.                 (uint64_t)watermark_width * 4 > UINT_MAX / watermark_height)

  1001.                 return -1;

  1002. 

  1003.             buf = av_malloc(buf_len);

  1004.             av_log(avctx, AV_LOG_DEBUG, "watermark size: %ux%u\n",

  1005.                    watermark_width, watermark_height);

  1006.             av_log(avctx, AV_LOG_DEBUG,

  1007.                    "u1: %x u2: %x u3: %x compressed data size: %d offset: %d\n",

  1008.                    u1, u2, u3, u4, offset);

  1009.             if (uncompress(buf, &buf_len, extradata + 8 + offset,

  1010.                            size - offset) != Z_OK) {

  1011.                 av_log(avctx, AV_LOG_ERROR,

  1012.                        "could not uncompress watermark logo\n");

  1013.                 av_free(buf);

  1014.                 return -1;

  1015.             }

  1016.             s->watermark_key = ff_svq1_packet_checksum(buf, buf_len, 0);

  1017.             s->watermark_key = s->watermark_key << 16 | s->watermark_key;

  1018.             av_log(avctx, AV_LOG_DEBUG,

  1019.                    "watermark key %#"PRIx32"\n", s->watermark_key);

  1020.             av_free(buf);

  1021. #else

  1022.             av_log(avctx, AV_LOG_ERROR,

  1023.                    "this svq3 file contains watermark which need zlib support compiled in\n");

  1024.             return -1;

  1025. #endif

  1026.         }

  1027.     }

  1028. 

  1029.     h->width  = avctx->width;

  1030.     h->height = avctx->height;

  1031.     h->mb_width  = (h->width + 15) / 16;

  1032.     h->mb_height = (h->height + 15) / 16;

  1033.     h->mb_stride = h->mb_width + 1;

  1034.     h->mb_num    = h->mb_width * h->mb_height;

  1035.     h->b_stride = 4 * h->mb_width;

  1036.     s->h_edge_pos = h->mb_width * 16;

  1037.     s->v_edge_pos = h->mb_height * 16;

  1038. 

  1039.     if (ff_h264_alloc_tables(h) < 0) {

  1040.         av_log(avctx, AV_LOG_ERROR, "svq3 memory allocation failed\n");

  1041.         return AVERROR(ENOMEM);

  1042.     }

  1043. 

  1044.     return 0;

  1045. }

  1046. 

  1047. static void free_picture(AVCodecContext *avctx, H264Picture *pic)

  1048. {

  1049.     int i;

  1050.     for (i = 0; i < 2; i++) {

  1051.         av_buffer_unref(&pic->motion_val_buf[i]);

  1052.         av_buffer_unref(&pic->ref_index_buf[i]);

  1053.     }

  1054.     av_buffer_unref(&pic->mb_type_buf);

  1055. 

  1056.     av_frame_unref(&pic->f);

  1057. }

  1058. 

  1059. static int get_buffer(AVCodecContext *avctx, H264Picture *pic)

  1060. {

  1061.     SVQ3Context *s = avctx->priv_data;

  1062.     H264Context *h = &s->h;

  1063.     const int big_mb_num    = h->mb_stride * (h->mb_height + 1) + 1;

  1064.     const int mb_array_size = h->mb_stride * h->mb_height;

  1065.     const int b4_stride     = h->mb_width * 4 + 1;

  1066.     const int b4_array_size = b4_stride * h->mb_height * 4;

  1067.     int ret;

  1068. 

  1069.     if (!pic->motion_val_buf[0]) {

  1070.         int i;

  1071. 

  1072.         pic->mb_type_buf = av_buffer_allocz((big_mb_num + h->mb_stride) * sizeof(uint32_t));

  1073.         if (!pic->mb_type_buf)

  1074.             return AVERROR(ENOMEM);

  1075.         pic->mb_type = (uint32_t*)pic->mb_type_buf->data + 2 * h->mb_stride + 1;

  1076. 

  1077.         for (i = 0; i < 2; i++) {

  1078.             pic->motion_val_buf[i] = av_buffer_allocz(2 * (b4_array_size + 4) * sizeof(int16_t));

  1079.             pic->ref_index_buf[i]  = av_buffer_allocz(4 * mb_array_size);

  1080.             if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i]) {

  1081.                 ret = AVERROR(ENOMEM);

  1082.                 goto fail;

  1083.             }

  1084. 

  1085.             pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;

  1086.             pic->ref_index[i]  = pic->ref_index_buf[i]->data;

  1087.         }

  1088.     }

  1089.     pic->reference = !(h->pict_type == AV_PICTURE_TYPE_B);

  1090. 

  1091.     ret = ff_get_buffer(avctx, &pic->f,

  1092.                         pic->reference ? AV_GET_BUFFER_FLAG_REF : 0);

  1093.     if (ret < 0)

  1094.         goto fail;

  1095. 

  1096.     if (!h->edge_emu_buffer) {

  1097.         h->edge_emu_buffer = av_mallocz(pic->f.linesize[0] * 17);

  1098.         if (!h->edge_emu_buffer)

  1099.             return AVERROR(ENOMEM);

  1100.     }

  1101. 

  1102.     h->linesize   = pic->f.linesize[0];

  1103.     h->uvlinesize = pic->f.linesize[1];

  1104. 

  1105.     return 0;

  1106. fail:

  1107.     free_picture(avctx, pic);

  1108.     return ret;

  1109. }

  1110. 

  1111. static int svq3_decode_frame(AVCodecContext *avctx, void *data,

  1112.                              int *got_frame, AVPacket *avpkt)

  1113. {

  1114.     const uint8_t *buf = avpkt->data;

  1115.     SVQ3Context *s     = avctx->priv_data;

  1116.     H264Context *h     = &s->h;

  1117.     H264SliceContext *sl = &h->slice_ctx[0];

  1118.     int buf_size       = avpkt->size;

  1119.     int ret, m, i;

  1120. 

  1121.     /* special case for last picture */

  1122.     if (buf_size == 0) {

  1123.         if (s->next_pic->f.data[0] && !h->low_delay && !s->last_frame_output) {

  1124.             ret = av_frame_ref(data, &s->next_pic->f);

  1125.             if (ret < 0)

  1126.                 return ret;

  1127.             s->last_frame_output = 1;

  1128.             *got_frame          = 1;

  1129.         }

  1130.         return 0;

  1131.     }

  1132. 

  1133.     init_get_bits(&h->gb, buf, 8 * buf_size);

  1134. 

  1135.     h->mb_x = h->mb_y = h->mb_xy = 0;

  1136. 

  1137.     if (svq3_decode_slice_header(avctx))

  1138.         return -1;

  1139. 

  1140.     h->pict_type = sl->slice_type;

  1141. 

  1142.     if (h->pict_type != AV_PICTURE_TYPE_B)

  1143.         FFSWAP(H264Picture*, s->next_pic, s->last_pic);

  1144. 

  1145.     av_frame_unref(&s->cur_pic->f);

  1146. 

  1147.     /* for skipping the frame */

  1148.     s->cur_pic->f.pict_type = h->pict_type;

  1149.     s->cur_pic->f.key_frame = (h->pict_type == AV_PICTURE_TYPE_I);

  1150. 

  1151.     ret = get_buffer(avctx, s->cur_pic);

  1152.     if (ret < 0)

  1153.         return ret;

  1154. 

  1155.     h->cur_pic_ptr = s->cur_pic;

  1156.     av_frame_unref(&h->cur_pic.f);

  1157.     h->cur_pic     = *s->cur_pic;

  1158.     ret = av_frame_ref(&h->cur_pic.f, &s->cur_pic->f);

  1159.     if (ret < 0)

  1160.         return ret;

  1161. 

  1162.     for (i = 0; i < 16; i++) {

  1163.         h->block_offset[i]           = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * h->linesize * ((scan8[i] - scan8[0]) >> 3);

  1164.         h->block_offset[48 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * h->linesize * ((scan8[i] - scan8[0]) >> 3);

  1165.     }

  1166.     for (i = 0; i < 16; i++) {

  1167.         h->block_offset[16 + i]      =

  1168.         h->block_offset[32 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * h->uvlinesize * ((scan8[i] - scan8[0]) >> 3);

  1169.         h->block_offset[48 + 16 + i] =

  1170.         h->block_offset[48 + 32 + i] = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * h->uvlinesize * ((scan8[i] - scan8[0]) >> 3);

  1171.     }

  1172. 

  1173.     if (h->pict_type != AV_PICTURE_TYPE_I) {

  1174.         if (!s->last_pic->f.data[0]) {

  1175.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1176.             ret = get_buffer(avctx, s->last_pic);

  1177.             if (ret < 0)

  1178.                 return ret;

  1179.             memset(s->last_pic->f.data[0], 0, avctx->height * s->last_pic->f.linesize[0]);

  1180.             memset(s->last_pic->f.data[1], 0x80, (avctx->height / 2) *

  1181.                    s->last_pic->f.linesize[1]);

  1182.             memset(s->last_pic->f.data[2], 0x80, (avctx->height / 2) *

  1183.                    s->last_pic->f.linesize[2]);

  1184.         }

  1185. 

  1186.         if (h->pict_type == AV_PICTURE_TYPE_B && !s->next_pic->f.data[0]) {

  1187.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1188.             ret = get_buffer(avctx, s->next_pic);

  1189.             if (ret < 0)

  1190.                 return ret;

  1191.             memset(s->next_pic->f.data[0], 0, avctx->height * s->next_pic->f.linesize[0]);

  1192.             memset(s->next_pic->f.data[1], 0x80, (avctx->height / 2) *

  1193.                    s->next_pic->f.linesize[1]);

  1194.             memset(s->next_pic->f.data[2], 0x80, (avctx->height / 2) *

  1195.                    s->next_pic->f.linesize[2]);

  1196.         }

  1197.     }

  1198. 

  1199.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  1200.         av_log(h->avctx, AV_LOG_DEBUG,

  1201.                "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n",

  1202.                av_get_picture_type_char(h->pict_type),

  1203.                s->halfpel_flag, s->thirdpel_flag,

  1204.                s->adaptive_quant, h->slice_ctx[0].qscale, sl->slice_num);

  1205. 

  1206.     if (avctx->skip_frame >= AVDISCARD_NONREF && h->pict_type == AV_PICTURE_TYPE_B ||

  1207.         avctx->skip_frame >= AVDISCARD_NONKEY && h->pict_type != AV_PICTURE_TYPE_I ||

  1208.         avctx->skip_frame >= AVDISCARD_ALL)

  1209.         return 0;

  1210. 

  1211.     if (s->next_p_frame_damaged) {

  1212.         if (h->pict_type == AV_PICTURE_TYPE_B)

  1213.             return 0;

  1214.         else

  1215.             s->next_p_frame_damaged = 0;

  1216.     }

  1217. 

  1218.     if (h->pict_type == AV_PICTURE_TYPE_B) {

  1219.         h->frame_num_offset = sl->slice_num - h->prev_frame_num;

  1220. 

  1221.         if (h->frame_num_offset < 0)

  1222.             h->frame_num_offset += 256;

  1223.         if (h->frame_num_offset == 0 ||

  1224.             h->frame_num_offset >= h->prev_frame_num_offset) {

  1225.             av_log(h->avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  1226.             return -1;

  1227.         }

  1228.     } else {

  1229.         h->prev_frame_num        = h->frame_num;

  1230.         h->frame_num             = sl->slice_num;

  1231.         h->prev_frame_num_offset = h->frame_num - h->prev_frame_num;

  1232. 

  1233.         if (h->prev_frame_num_offset < 0)

  1234.             h->prev_frame_num_offset += 256;

  1235.     }

  1236. 

  1237.     for (m = 0; m < 2; m++) {

  1238.         int i;

  1239.         for (i = 0; i < 4; i++) {

  1240.             int j;

  1241.             for (j = -1; j < 4; j++)

  1242.                 sl->ref_cache[m][scan8[0] + 8 * i + j] = 1;

  1243.             if (i < 3)

  1244.                 sl->ref_cache[m][scan8[0] + 8 * i + j] = PART_NOT_AVAILABLE;

  1245.         }

  1246.     }

  1247. 

  1248.     for (h->mb_y = 0; h->mb_y < h->mb_height; h->mb_y++) {

  1249.         for (h->mb_x = 0; h->mb_x < h->mb_width; h->mb_x++) {

  1250.             unsigned mb_type;

  1251.             h->mb_xy = h->mb_x + h->mb_y * h->mb_stride;

  1252. 

  1253.             if ((get_bits_count(&h->gb) + 7) >= h->gb.size_in_bits &&

  1254.                 ((get_bits_count(&h->gb) & 7) == 0 ||

  1255.                  show_bits(&h->gb, -get_bits_count(&h->gb) & 7) == 0)) {

  1256.                 skip_bits(&h->gb, s->next_slice_index - get_bits_count(&h->gb));

  1257.                 h->gb.size_in_bits = 8 * buf_size;

  1258. 

  1259.                 if (svq3_decode_slice_header(avctx))

  1260.                     return -1;

  1261. 

  1262.                 /* TODO: support s->mb_skip_run */

  1263.             }

  1264. 

  1265.             mb_type = svq3_get_ue_golomb(&h->gb);

  1266. 

  1267.             if (h->pict_type == AV_PICTURE_TYPE_I)

  1268.                 mb_type += 8;

  1269.             else if (h->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4)

  1270.                 mb_type += 4;

  1271.             if (mb_type > 33 || svq3_decode_mb(s, mb_type)) {

  1272.                 av_log(h->avctx, AV_LOG_ERROR,

  1273.                        "error while decoding MB %d %d\n", h->mb_x, h->mb_y);

  1274.                 return -1;

  1275.             }

  1276. 

  1277.             if (mb_type != 0)

  1278.                 ff_h264_hl_decode_mb(h, &h->slice_ctx[0]);

  1279. 

  1280.             if (h->pict_type != AV_PICTURE_TYPE_B && !h->low_delay)

  1281.                 h->cur_pic.mb_type[h->mb_x + h->mb_y * h->mb_stride] =

  1282.                     (h->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1283.         }

  1284. 

  1285.         ff_draw_horiz_band(avctx, &s->cur_pic->f,

  1286.                            s->last_pic->f.data[0] ? &s->last_pic->f : NULL,

  1287.                            16 * h->mb_y, 16, h->picture_structure, 0,

  1288.                            h->low_delay);

  1289.     }

  1290. 

  1291.     if (h->pict_type == AV_PICTURE_TYPE_B || h->low_delay)

  1292.         ret = av_frame_ref(data, &s->cur_pic->f);

  1293.     else if (s->last_pic->f.data[0])

  1294.         ret = av_frame_ref(data, &s->last_pic->f);

  1295.     if (ret < 0)

  1296.         return ret;

  1297. 

  1298.     /* Do not output the last pic after seeking. */

  1299.     if (s->last_pic->f.data[0] || h->low_delay)

  1300.         *got_frame = 1;

  1301. 

  1302.     if (h->pict_type != AV_PICTURE_TYPE_B) {

  1303.         FFSWAP(H264Picture*, s->cur_pic, s->next_pic);

  1304.     } else {

  1305.         av_frame_unref(&s->cur_pic->f);

  1306.     }

  1307. 

  1308.     return buf_size;

  1309. }

  1310. 

  1311. static av_cold int svq3_decode_end(AVCodecContext *avctx)

  1312. {

  1313.     SVQ3Context *s = avctx->priv_data;

  1314.     H264Context *h = &s->h;

  1315. 

  1316.     free_picture(avctx, s->cur_pic);

  1317.     free_picture(avctx, s->next_pic);

  1318.     free_picture(avctx, s->last_pic);

  1319.     av_freep(&s->cur_pic);

  1320.     av_freep(&s->next_pic);

  1321.     av_freep(&s->last_pic);

  1322. 

  1323.     av_frame_unref(&h->cur_pic.f);

  1324. 

  1325.     ff_h264_free_context(h);

  1326. 

  1327.     return 0;

  1328. }

  1329. 

  1330. AVCodec ff_svq3_decoder = {

  1331.     .name           = "svq3",

  1332.     .long_name      = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1333.     .type           = AVMEDIA_TYPE_VIDEO,

  1334.     .id             = AV_CODEC_ID_SVQ3,

  1335.     .priv_data_size = sizeof(SVQ3Context),

  1336.     .init           = svq3_decode_init,

  1337.     .close          = svq3_decode_end,

  1338.     .decode         = svq3_decode_frame,

  1339.     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND |

  1340.                       CODEC_CAP_DR1             |

  1341.                       CODEC_CAP_DELAY,

  1342.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P,

  1343.                                                      AV_PIX_FMT_NONE},

  1344. };