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FFmpeg/libavcodec/svq3.c

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  1. /*

  2.  * Copyright (c) 2003 The FFmpeg Project

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. /*

  22.  * How to use this decoder:

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

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

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

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

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

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

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

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

  31.  *

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

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

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

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

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

  37.  *

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

  39.  * correctly decodes this file:

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

  41.  */

  42. #include "internal.h"

  43. #include "dsputil.h"

  44. #include "avcodec.h"

  45. #include "mpegvideo.h"

  46. #include "h264.h"

  47. 

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

  49. 

  50. #include "h264_mvpred.h"

  51. #include "golomb.h"

  52. #include "rectangle.h"

  53. #include "vdpau_internal.h"

  54. 

  55. #if CONFIG_ZLIB

  56. #include <zlib.h>

  57. #endif

  58. 

  59. #include "svq1.h"

  60. 

  61. /**

  62.  * @file

  63.  * svq3 decoder.

  64.  */

  65. 

  66. typedef struct {

  67.     H264Context h;

  68.     int halfpel_flag;

  69.     int thirdpel_flag;

  70.     int unknown_flag;

  71.     int next_slice_index;

  72.     uint32_t watermark_key;

  73.     uint8_t *buf;

  74.     int buf_size;

  75. } SVQ3Context;

  76. 

  77. #define FULLPEL_MODE  1

  78. #define HALFPEL_MODE  2

  79. #define THIRDPEL_MODE 3

  80. #define PREDICT_MODE  4

  81. 

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

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

  84.  *         |  /|

  85.  * o   o   o / o

  86.  * | / |   |/  |

  87.  * o   o   o   o

  88.  *   /

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

  90.  */

  91. static const uint8_t svq3_scan[16] = {

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

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

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

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

  96. };

  97. 

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

  99.     { 0, 0 },

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

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

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

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

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

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

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

  107.     { 4, 4 }

  108. };

  109. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  123. };

  124. 

  125. static const struct {

  126.     uint8_t run;

  127.     uint8_t level;

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

  129.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  130.       { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  131.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  132.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  133. };

  134. 

  135. static const uint32_t svq3_dequant_coeff[32] = {

  136.      3881,  4351,  4890,  5481,   6154,   6914,   7761,   8718,

  137.      9781, 10987, 12339, 13828,  15523,  17435,  19561,  21873,

  138.     24552, 27656, 30847, 34870,  38807,  43747,  49103,  54683,

  139.     61694, 68745, 77615, 89113, 100253, 109366, 126635, 141533

  140. };

  141. 

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

  143. {

  144.     const int qmul = svq3_dequant_coeff[qp];

  145. #define stride 16

  146.     int i;

  147.     int temp[16];

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

  149. 

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

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

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

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

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

  155. 

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

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

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

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

  160.     }

  161. 

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

  163.         const int offset = x_offset[i];

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

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

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

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

  168. 

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

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

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

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

  173.     }

  174. }

  175. #undef stride

  176. 

  177. void ff_svq3_add_idct_c(uint8_t *dst, DCTELEM *block,

  178.                         int stride, int qp, int dc)

  179. {

  180.     const int qmul = svq3_dequant_coeff[qp];

  181.     int i;

  182. 

  183.     if (dc) {

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

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

  186.         block[0] = 0;

  187.     }

  188. 

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

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

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

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

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

  194. 

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

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

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

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

  199.     }

  200. 

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

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

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

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

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

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

  207. 

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

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

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

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

  212.     }

  213. }

  214. 

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

  216.                                     int index, const int type)

  217. {

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

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

  220. 

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

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

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

  224. 

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

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

  227.             if (vlc < 0)

  228.                 return -1;

  229. 

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

  231.             vlc  = vlc + 1 >> 1;

  232. 

  233.             if (type == 3) {

  234.                 if (vlc < 3) {

  235.                     run   = 0;

  236.                     level = vlc;

  237.                 } else if (vlc < 4) {

  238.                     run   = 1;

  239.                     level = 1;

  240.                 } else {

  241.                     run   = vlc & 0x3;

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

  243.                 }

  244.             } else {

  245.                 if (vlc < 16U) {

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

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

  248.                 } else if (intra) {

  249.                     run   = vlc & 0x7;

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

  251.                 } else {

  252.                     run   = vlc & 0xF;

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

  254.                 }

  255.             }

  256. 

  257. 

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

  259.                 return -1;

  260. 

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

  262.         }

  263. 

  264.         if (type != 2) {

  265.             break;

  266.         }

  267.     }

  268. 

  269.     return 0;

  270. }

  271. 

  272. static inline void svq3_mc_dir_part(MpegEncContext *s,

  273.                                     int x, int y, int width, int height,

  274.                                     int mx, int my, int dxy,

  275.                                     int thirdpel, int dir, int avg)

  276. {

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

  278.     uint8_t *src, *dest;

  279.     int i, emu = 0;

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

  281. 

  282.     mx += x;

  283.     my += y;

  284. 

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

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

  287.         if ((s->flags & CODEC_FLAG_EMU_EDGE))

  288.             emu = 1;

  289. 

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

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

  292.     }

  293. 

  294.     /* form component predictions */

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

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

  297. 

  298.     if (emu) {

  299.         s->dsp.emulated_edge_mc(s->edge_emu_buffer, src, s->linesize,

  300.                                 width + 1, height + 1,

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

  302.         src = s->edge_emu_buffer;

  303.     }

  304.     if (thirdpel)

  305.         (avg ? s->dsp.avg_tpel_pixels_tab

  306.              : s->dsp.put_tpel_pixels_tab)[dxy](dest, src, s->linesize,

  307.                                                 width, height);

  308.     else

  309.         (avg ? s->dsp.avg_pixels_tab

  310.              : s->dsp.put_pixels_tab)[blocksize][dxy](dest, src, s->linesize,

  311.                                                       height);

  312. 

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

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

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

  316.         width  = width  >> 1;

  317.         height = height >> 1;

  318.         blocksize++;

  319. 

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

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

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

  323. 

  324.             if (emu) {

  325.                 s->dsp.emulated_edge_mc(s->edge_emu_buffer, src, s->uvlinesize,

  326.                                         width + 1, height + 1,

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

  328.                                         s->v_edge_pos >> 1);

  329.                 src = s->edge_emu_buffer;

  330.             }

  331.             if (thirdpel)

  332.                 (avg ? s->dsp.avg_tpel_pixels_tab

  333.                      : s->dsp.put_tpel_pixels_tab)[dxy](dest, src,

  334.                                                         s->uvlinesize,

  335.                                                         width, height);

  336.             else

  337.                 (avg ? s->dsp.avg_pixels_tab

  338.                      : s->dsp.put_pixels_tab)[blocksize][dxy](dest, src,

  339.                                                               s->uvlinesize,

  340.                                                               height);

  341.         }

  342.     }

  343. }

  344. 

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

  346.                               int dir, int avg)

  347. {

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

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

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

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

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

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

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

  355. 

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

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

  358.             const int b_xy = (4 * s->mb_x + (j >> 2)) +

  359.                              (4 * s->mb_y + (i >> 2)) * h->b_stride;

  360.             int dxy;

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

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

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

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

  365. 

  366.             if (mode != PREDICT_MODE) {

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

  368.             } else {

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

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

  371. 

  372.                 if (dir == 0) {

  373.                     mx = mx * h->frame_num_offset /

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

  375.                     my = my * h->frame_num_offset /

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

  377.                 } else {

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

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

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

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

  382.                 }

  383.             }

  384. 

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

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

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

  388. 

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

  390.             if (mode == PREDICT_MODE) {

  391.                 dx = dy = 0;

  392.             } else {

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

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

  395. 

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

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

  398.                     return -1;

  399.                 }

  400.             }

  401. 

  402.             /* compute motion vector */

  403.             if (mode == THIRDPEL_MODE) {

  404.                 int fx, fy;

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

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

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

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

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

  410. 

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

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

  413.                 mx += mx;

  414.                 my += my;

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

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

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

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

  419. 

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

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

  422.                 mx *= 3;

  423.                 my *= 3;

  424.             } else {

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

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

  427. 

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

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

  430.                 mx *= 6;

  431.                 my *= 6;

  432.             }

  433. 

  434.             /* update mv_cache */

  435.             if (mode != PREDICT_MODE) {

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

  437. 

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

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

  440. 

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

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

  443.                 }

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

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

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

  447.                     AV_WN32A(h->mv_cache[dir][scan8[k]], mv);

  448.             }

  449. 

  450.             /* write back motion vectors */

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

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

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

  454.         }

  455. 

  456.     return 0;

  457. }

  458. 

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

  460. {

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

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

  463.     int cbp = 0;

  464.     uint32_t vlc;

  465.     int8_t *top, *left;

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

  467.     const int mb_xy         = h->mb_xy;

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

  469. 

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

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

  472.     h->topright_samples_available = 0xFFFF;

  473. 

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

  475.         if (s->pict_type == AV_PICTURE_TYPE_P ||

  476.             s->next_picture.f.mb_type[mb_xy] == -1) {

  477.             svq3_mc_dir_part(s, 16 * s->mb_x, 16 * s->mb_y, 16, 16,

  478.                              0, 0, 0, 0, 0, 0);

  479. 

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

  481.                 svq3_mc_dir_part(s, 16 * s->mb_x, 16 * s->mb_y, 16, 16,

  482.                                  0, 0, 0, 0, 1, 1);

  483. 

  484.             mb_type = MB_TYPE_SKIP;

  485.         } else {

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

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

  488.                 return -1;

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

  490.                 return -1;

  491. 

  492.             mb_type = MB_TYPE_16x16;

  493.         }

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

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

  496.             mode = THIRDPEL_MODE;

  497.         else if (svq3->halfpel_flag &&

  498.                  svq3->thirdpel_flag == !get_bits1(&s->gb))

  499.             mode = HALFPEL_MODE;

  500.         else

  501.             mode = FULLPEL_MODE;

  502. 

  503.         /* fill caches */

  504.         /* note ref_cache should contain here:

  505.          *  ????????

  506.          *  ???11111

  507.          *  N??11111

  508.          *  N??11111

  509.          *  N??11111

  510.          */

  511. 

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

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

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

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

  516.                               s->current_picture.f.motion_val[m][b_xy - 1 + i * h->b_stride]);

  517.             } else {

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

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

  520.             }

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

  522.                 memcpy(h->mv_cache[m][scan8[0] - 1 * 8],

  523.                        s->current_picture.f.motion_val[m][b_xy - h->b_stride],

  524.                        4 * 2 * sizeof(int16_t));

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

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

  527. 

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

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

  530.                               s->current_picture.f.motion_val[m][b_xy - h->b_stride + 4]);

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

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

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

  534.                 } else

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

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

  537.                     AV_COPY32(h->mv_cache[m][scan8[0] - 1 - 1 * 8],

  538.                               s->current_picture.f.motion_val[m][b_xy - h->b_stride - 1]);

  539.                     h->ref_cache[m][scan8[0] - 1 - 1 * 8] =

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

  541.                 } else

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

  543.             } else

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

  545.                        PART_NOT_AVAILABLE, 8);

  546. 

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

  548.                 break;

  549.         }

  550. 

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

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

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

  554.                 return -1;

  555.         } else {        /* AV_PICTURE_TYPE_B */

  556.             if (mb_type != 2) {

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

  558.                     return -1;

  559.             } else {

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

  561.                     memset(s->current_picture.f.motion_val[0][b_xy + i * h->b_stride],

  562.                            0, 4 * 2 * sizeof(int16_t));

  563.             }

  564.             if (mb_type != 1) {

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

  566.                     return -1;

  567.             } else {

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

  569.                     memset(s->current_picture.f.motion_val[1][b_xy + i * h->b_stride],

  570.                            0, 4 * 2 * sizeof(int16_t));

  571.             }

  572.         }

  573. 

  574.         mb_type = MB_TYPE_16x16;

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

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

  577. 

  578.         if (mb_type == 8) {

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

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

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

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

  583.                     h->left_samples_available = 0x5F5F;

  584.             }

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

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

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

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

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

  590. 

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

  592.                     h->top_samples_available = 0x33FF;

  593.             }

  594. 

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

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

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

  598. 

  599.                 if (vlc >= 25U) {

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

  601.                     return -1;

  602.                 }

  603. 

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

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

  606. 

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

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

  609. 

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

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

  612.                     return -1;

  613.                 }

  614.             }

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

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

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

  618.         }

  619. 

  620.         write_back_intra_pred_mode(h);

  621. 

  622.         if (mb_type == 8) {

  623.             ff_h264_check_intra4x4_pred_mode(h);

  624. 

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

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

  627.         } else {

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

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

  630. 

  631.             h->top_samples_available  = 0x33FF;

  632.             h->left_samples_available = 0x5F5F;

  633.         }

  634. 

  635.         mb_type = MB_TYPE_INTRA4x4;

  636.     } else {                      /* INTRA16x16 */

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

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

  639. 

  640.         if ((h->intra16x16_pred_mode = ff_h264_check_intra_pred_mode(h, dir, 0)) == -1) {

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

  642.             return -1;

  643.         }

  644. 

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

  646.         mb_type = MB_TYPE_INTRA16x16;

  647.     }

  648. 

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

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

  651.             memset(s->current_picture.f.motion_val[0][b_xy + i * h->b_stride],

  652.                    0, 4 * 2 * sizeof(int16_t));

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

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

  655.                 memset(s->current_picture.f.motion_val[1][b_xy + i * h->b_stride],

  656.                        0, 4 * 2 * sizeof(int16_t));

  657.         }

  658.     }

  659.     if (!IS_INTRA4x4(mb_type)) {

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

  661.     }

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

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

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

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

  666.     }

  667. 

  668.     if (!IS_INTRA16x16(mb_type) &&

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

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

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

  672.             return -1;

  673.         }

  674. 

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

  676.                                 : golomb_to_inter_cbp[vlc];

  677.     }

  678.     if (IS_INTRA16x16(mb_type) ||

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

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

  681. 

  682.         if (s->qscale > 31u) {

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

  684.             return -1;

  685.         }

  686.     }

  687.     if (IS_INTRA16x16(mb_type)) {

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

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

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

  691.             av_log(h->s.avctx, AV_LOG_ERROR,

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

  693.             return -1;

  694.         }

  695.     }

  696. 

  697.     if (cbp) {

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

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

  700. 

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

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

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

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

  705.                                  2 * (j & 2) + 4 * (i & 2))

  706.                               : (4 * i + j);

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

  708. 

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

  710.                         av_log(h->s.avctx, AV_LOG_ERROR,

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

  712.                         return -1;

  713.                     }

  714.                 }

  715.             }

  716. 

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

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

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

  720.                     av_log(h->s.avctx, AV_LOG_ERROR,

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

  722.                     return -1;

  723.                 }

  724. 

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

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

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

  728.                         k                                 = 16 * i + j;

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

  730. 

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

  732.                             av_log(h->s.avctx, AV_LOG_ERROR,

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

  734.                             return -1;

  735.                         }

  736.                     }

  737.                 }

  738.             }

  739.         }

  740.     }

  741. 

  742.     h->cbp                              = cbp;

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

  744. 

  745.     if (IS_INTRA(mb_type))

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

  747. 

  748.     return 0;

  749. }

  750. 

  751. static int svq3_decode_slice_header(AVCodecContext *avctx)

  752. {

  753.     SVQ3Context *svq3 = avctx->priv_data;

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

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

  756.     const int mb_xy   = h->mb_xy;

  757.     int i, header;

  758. 

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

  760. 

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

  762.         /* TODO: what? */

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

  764.         return -1;

  765.     } else {

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

  767. 

  768.         svq3->next_slice_index = get_bits_count(&s->gb) +

  769.                                  8 * show_bits(&s->gb, 8 * length) +

  770.                                  8 * length;

  771. 

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

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

  774.             return -1;

  775.         }

  776. 

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

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

  779. 

  780.         if (svq3->watermark_key) {

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

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

  783.                     header ^ svq3->watermark_key);

  784.         }

  785.         if (length > 0) {

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

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

  788.         }

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

  790.     }

  791. 

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

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

  794.         return -1;

  795.     }

  796. 

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

  798. 

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

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

  801.         s->mb_skip_run = get_bits(&s->gb, i) -

  802.                          (s->mb_y * s->mb_width + s->mb_x);

  803.     } else {

  804.         skip_bits1(&s->gb);

  805.         s->mb_skip_run = 0;

  806.     }

  807. 

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

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

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

  811. 

  812.     /* unknown fields */

  813.     skip_bits1(&s->gb);

  814. 

  815.     if (svq3->unknown_flag)

  816.         skip_bits1(&s->gb);

  817. 

  818.     skip_bits1(&s->gb);

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

  820. 

  821.     while (get_bits1(&s->gb))

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

  823. 

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

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

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

  827.                -1, 4 * sizeof(int8_t));

  828.         memset(h->intra4x4_pred_mode + h->mb2br_xy[mb_xy - s->mb_x],

  829.                -1, 8 * sizeof(int8_t) * s->mb_x);

  830.     }

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

  832.         memset(h->intra4x4_pred_mode + h->mb2br_xy[mb_xy - s->mb_stride],

  833.                -1, 8 * sizeof(int8_t) * (s->mb_width - s->mb_x));

  834. 

  835.         if (s->mb_x > 0)

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

  837.     }

  838. 

  839.     return 0;

  840. }

  841. 

  842. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  843. {

  844.     SVQ3Context *svq3 = avctx->priv_data;

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

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

  847.     int m;

  848.     unsigned char *extradata;

  849.     unsigned char *extradata_end;

  850.     unsigned int size;

  851.     int marker_found = 0;

  852. 

  853.     if (ff_h264_decode_init(avctx) < 0)

  854.         return -1;

  855. 

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

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

  858.     s->unrestricted_mv = 1;

  859.     h->is_complex      = 1;

  860.     h->sps.chroma_format_idc = 1;

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

  862. 

  863.     if (!s->context_initialized) {

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

  865. 

  866.         svq3->halfpel_flag  = 1;

  867.         svq3->thirdpel_flag = 1;

  868.         svq3->unknown_flag  = 0;

  869. 

  870. 

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

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

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

  874.         if (extradata) {

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

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

  877.                     marker_found = 1;

  878.                     break;

  879.                 }

  880.                 extradata++;

  881.             }

  882.         }

  883. 

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

  885.         if (marker_found) {

  886.             GetBitContext gb;

  887.             int frame_size_code;

  888. 

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

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

  891.                 return AVERROR_INVALIDDATA;

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

  893. 

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

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

  896.             switch (frame_size_code) {

  897.             case 0:

  898.                 avctx->width  = 160;

  899.                 avctx->height = 120;

  900.                 break;

  901.             case 1:

  902.                 avctx->width  = 128;

  903.                 avctx->height =  96;

  904.                 break;

  905.             case 2:

  906.                 avctx->width  = 176;

  907.                 avctx->height = 144;

  908.                 break;

  909.             case 3:

  910.                 avctx->width  = 352;

  911.                 avctx->height = 288;

  912.                 break;

  913.             case 4:

  914.                 avctx->width  = 704;

  915.                 avctx->height = 576;

  916.                 break;

  917.             case 5:

  918.                 avctx->width  = 240;

  919.                 avctx->height = 180;

  920.                 break;

  921.             case 6:

  922.                 avctx->width  = 320;

  923.                 avctx->height = 240;

  924.                 break;

  925.             case 7:

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

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

  928.                 break;

  929.             }

  930. 

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

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

  933. 

  934.             /* unknown fields */

  935.             skip_bits1(&gb);

  936.             skip_bits1(&gb);

  937.             skip_bits1(&gb);

  938.             skip_bits1(&gb);

  939. 

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

  941. 

  942.             /* unknown field */

  943.             skip_bits1(&gb);

  944. 

  945.             while (get_bits1(&gb))

  946.                 skip_bits(&gb, 8);

  947. 

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

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

  950.             if (svq3->unknown_flag) {

  951. #if CONFIG_ZLIB

  952.                 unsigned watermark_width  = svq3_get_ue_golomb(&gb);

  953.                 unsigned watermark_height = svq3_get_ue_golomb(&gb);

  954.                 int u1                    = svq3_get_ue_golomb(&gb);

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

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

  957.                 int u4                    = svq3_get_ue_golomb(&gb);

  958.                 unsigned long buf_len     = watermark_width *

  959.                                             watermark_height * 4;

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

  961.                 uint8_t *buf;

  962. 

  963.                 if (watermark_height <= 0 || (uint64_t)watermark_width*4 > UINT_MAX/watermark_height)

  964.                     return -1;

  965. 

  966.                 buf = av_malloc(buf_len);

  967.                 av_log(avctx, AV_LOG_DEBUG, "watermark size: %dx%d\n",

  968.                        watermark_width, watermark_height);

  969.                 av_log(avctx, AV_LOG_DEBUG,

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

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

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

  973.                                size - offset) != Z_OK) {

  974.                     av_log(avctx, AV_LOG_ERROR,

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

  976.                     av_free(buf);

  977.                     return -1;

  978.                 }

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

  980.                 svq3->watermark_key = svq3->watermark_key << 16 |

  981.                                       svq3->watermark_key;

  982.                 av_log(avctx, AV_LOG_DEBUG,

  983.                        "watermark key %#x\n", svq3->watermark_key);

  984.                 av_free(buf);

  985. #else

  986.                 av_log(avctx, AV_LOG_ERROR,

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

  988.                 return -1;

  989. #endif

  990.             }

  991.         }

  992. 

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

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

  995. 

  996.         if (ff_MPV_common_init(s) < 0)

  997.             return -1;

  998. 

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

  1000. 

  1001.         if (ff_h264_alloc_tables(h) < 0) {

  1002.             av_log(avctx, AV_LOG_ERROR, "svq3 memory allocation failed\n");

  1003.             return AVERROR(ENOMEM);

  1004.         }

  1005.     }

  1006. 

  1007.     return 0;

  1008. }

  1009. 

  1010. static int svq3_decode_frame(AVCodecContext *avctx, void *data,

  1011.                              int *data_size, AVPacket *avpkt)

  1012. {

  1013.     SVQ3Context *svq3  = avctx->priv_data;

  1014.     H264Context *h     = &svq3->h;

  1015.     MpegEncContext *s  = &h->s;

  1016.     int buf_size       = avpkt->size;

  1017.     int m, mb_type, left;

  1018.     uint8_t *buf;

  1019. 

  1020.     /* special case for last picture */

  1021.     if (buf_size == 0) {

  1022.         if (s->next_picture_ptr && !s->low_delay) {

  1023.             *(AVFrame *) data   = s->next_picture.f;

  1024.             s->next_picture_ptr = NULL;

  1025.             *data_size          = sizeof(AVFrame);

  1026.         }

  1027.         return 0;

  1028.     }

  1029. 

  1030.     s->mb_x = s->mb_y = h->mb_xy = 0;

  1031. 

  1032.     if (svq3->watermark_key) {

  1033.         av_fast_malloc(&svq3->buf, &svq3->buf_size,

  1034.                        buf_size+FF_INPUT_BUFFER_PADDING_SIZE);

  1035.         if (!svq3->buf)

  1036.             return AVERROR(ENOMEM);

  1037.         memcpy(svq3->buf, avpkt->data, buf_size);

  1038.         buf = svq3->buf;

  1039.     } else {

  1040.         buf = avpkt->data;

  1041.     }

  1042. 

  1043.     init_get_bits(&s->gb, buf, 8 * buf_size);

  1044. 

  1045.     if (svq3_decode_slice_header(avctx))

  1046.         return -1;

  1047. 

  1048.     s->pict_type      = h->slice_type;

  1049.     s->picture_number = h->slice_num;

  1050. 

  1051.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  1052.         av_log(h->s.avctx, AV_LOG_DEBUG,

  1053.                "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n",

  1054.                av_get_picture_type_char(s->pict_type),

  1055.                svq3->halfpel_flag, svq3->thirdpel_flag,

  1056.                s->adaptive_quant, s->qscale, h->slice_num);

  1057. 

  1058.     /* for skipping the frame */

  1059.     s->current_picture.f.pict_type = s->pict_type;

  1060.     s->current_picture.f.key_frame = (s->pict_type == AV_PICTURE_TYPE_I);

  1061. 

  1062.     /* Skip B-frames if we do not have reference frames. */

  1063.     if (s->last_picture_ptr == NULL && s->pict_type == AV_PICTURE_TYPE_B)

  1064.         return 0;

  1065.     if (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B ||

  1066.         avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I ||

  1067.         avctx->skip_frame >= AVDISCARD_ALL)

  1068.         return 0;

  1069. 

  1070.     if (s->next_p_frame_damaged) {

  1071.         if (s->pict_type == AV_PICTURE_TYPE_B)

  1072.             return 0;

  1073.         else

  1074.             s->next_p_frame_damaged = 0;

  1075.     }

  1076. 

  1077.     if (ff_h264_frame_start(h) < 0)

  1078.         return -1;

  1079. 

  1080.     if (s->pict_type == AV_PICTURE_TYPE_B) {

  1081.         h->frame_num_offset = h->slice_num - h->prev_frame_num;

  1082. 

  1083.         if (h->frame_num_offset < 0)

  1084.             h->frame_num_offset += 256;

  1085.         if (h->frame_num_offset == 0 ||

  1086.             h->frame_num_offset >= h->prev_frame_num_offset) {

  1087.             av_log(h->s.avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  1088.             return -1;

  1089.         }

  1090.     } else {

  1091.         h->prev_frame_num        = h->frame_num;

  1092.         h->frame_num             = h->slice_num;

  1093.         h->prev_frame_num_offset = h->frame_num - h->prev_frame_num;

  1094. 

  1095.         if (h->prev_frame_num_offset < 0)

  1096.             h->prev_frame_num_offset += 256;

  1097.     }

  1098. 

  1099.     for (m = 0; m < 2; m++) {

  1100.         int i;

  1101.         for (i = 0; i < 4; i++) {

  1102.             int j;

  1103.             for (j = -1; j < 4; j++)

  1104.                 h->ref_cache[m][scan8[0] + 8 * i + j] = 1;

  1105.             if (i < 3)

  1106.                 h->ref_cache[m][scan8[0] + 8 * i + j] = PART_NOT_AVAILABLE;

  1107.         }

  1108.     }

  1109. 

  1110.     for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  1111.         for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  1112.             h->mb_xy = s->mb_x + s->mb_y * s->mb_stride;

  1113. 

  1114.             if ((get_bits_count(&s->gb) + 7) >= s->gb.size_in_bits &&

  1115.                 ((get_bits_count(&s->gb) & 7) == 0 ||

  1116.                  show_bits(&s->gb, -get_bits_count(&s->gb) & 7) == 0)) {

  1117.                 skip_bits(&s->gb, svq3->next_slice_index - get_bits_count(&s->gb));

  1118.                 s->gb.size_in_bits = 8 * buf_size;

  1119. 

  1120.                 if (svq3_decode_slice_header(avctx))

  1121.                     return -1;

  1122. 

  1123.                 /* TODO: support s->mb_skip_run */

  1124.             }

  1125. 

  1126.             mb_type = svq3_get_ue_golomb(&s->gb);

  1127. 

  1128.             if (s->pict_type == AV_PICTURE_TYPE_I)

  1129.                 mb_type += 8;

  1130.             else if (s->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4)

  1131.                 mb_type += 4;

  1132.             if ((unsigned)mb_type > 33 || svq3_decode_mb(svq3, mb_type)) {

  1133.                 av_log(h->s.avctx, AV_LOG_ERROR,

  1134.                        "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1135.                 return -1;

  1136.             }

  1137. 

  1138.             if (mb_type != 0)

  1139.                 ff_h264_hl_decode_mb(h);

  1140. 

  1141.             if (s->pict_type != AV_PICTURE_TYPE_B && !s->low_delay)

  1142.                 s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] =

  1143.                     (s->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1144.         }

  1145. 

  1146.         ff_draw_horiz_band(s, 16 * s->mb_y, 16);

  1147.     }

  1148. 

  1149.     left = buf_size*8 - get_bits_count(&s->gb);

  1150. 

  1151.     if (s->mb_y != s->mb_height || s->mb_x != s->mb_width) {

  1152.         av_log(avctx, AV_LOG_INFO, "frame num %d incomplete pic x %d y %d left %d\n", avctx->frame_number, s->mb_y, s->mb_x, left);

  1153.         //av_hex_dump(stderr, buf+buf_size-8, 8);

  1154.     }

  1155. 

  1156.     if (left < 0) {

  1157.         av_log(avctx, AV_LOG_ERROR, "frame num %d left %d\n", avctx->frame_number, left);

  1158.         return -1;

  1159.     }

  1160. 

  1161.     ff_MPV_frame_end(s);

  1162. 

  1163.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay)

  1164.         *(AVFrame *)data = s->current_picture.f;

  1165.     else

  1166.         *(AVFrame *)data = s->last_picture.f;

  1167. 

  1168.     /* Do not output the last pic after seeking. */

  1169.     if (s->last_picture_ptr || s->low_delay)

  1170.         *data_size = sizeof(AVFrame);

  1171. 

  1172.     return buf_size;

  1173. }

  1174. 

  1175. static int svq3_decode_end(AVCodecContext *avctx)

  1176. {

  1177.     SVQ3Context *svq3 = avctx->priv_data;

  1178.     H264Context *h    = &svq3->h;

  1179.     MpegEncContext *s = &h->s;

  1180. 

  1181.     ff_h264_free_context(h);

  1182. 

  1183.     ff_MPV_common_end(s);

  1184. 

  1185.     av_freep(&svq3->buf);

  1186.     svq3->buf_size = 0;

  1187. 

  1188.     return 0;

  1189. }

  1190. 

  1191. AVCodec ff_svq3_decoder = {

  1192.     .name           = "svq3",

  1193.     .type           = AVMEDIA_TYPE_VIDEO,

  1194.     .id             = AV_CODEC_ID_SVQ3,

  1195.     .priv_data_size = sizeof(SVQ3Context),

  1196.     .init           = svq3_decode_init,

  1197.     .close          = svq3_decode_end,

  1198.     .decode         = svq3_decode_frame,

  1199.     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND |

  1200.                       CODEC_CAP_DR1             |

  1201.                       CODEC_CAP_DELAY,

  1202.     .long_name      = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1203.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P,

  1204.                                                      AV_PIX_FMT_NONE},

  1205. };