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FFmpeg/libavcodec/svq3.c

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  1. /*

  2.  * Copyright (c) 2003 The Libav Project

  3.  *

  4.  * This file is part of Libav.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. /*

  22.  * How to use this decoder:

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

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

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

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

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

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

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

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

  31.  *

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

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

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

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

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

  37.  *

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

  39.  * correctly decodes this file:

  40.  *  http://samples.libav.org/V-codecs/SVQ3/Vertical400kbit.sorenson3.mov

  41.  */

  42. #include "internal.h"

  43. #include "dsputil.h"

  44. #include "avcodec.h"

  45. #include "mpegvideo.h"

  46. #include "h264.h"

  47. 

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

  49. 

  50. #include "h264_mvpred.h"

  51. #include "golomb.h"

  52. #include "rectangle.h"

  53. #include "vdpau_internal.h"

  54. 

  55. #if CONFIG_ZLIB

  56. #include <zlib.h>

  57. #endif

  58. 

  59. #include "svq1.h"

  60. 

  61. /**

  62.  * @file

  63.  * svq3 decoder.

  64.  */

  65. 

  66. typedef struct {

  67.     H264Context h;

  68.     int halfpel_flag;

  69.     int thirdpel_flag;

  70.     int unknown_flag;

  71.     int next_slice_index;

  72.     uint32_t watermark_key;

  73. } SVQ3Context;

  74. 

  75. #define FULLPEL_MODE  1

  76. #define HALFPEL_MODE  2

  77. #define THIRDPEL_MODE 3

  78. #define PREDICT_MODE  4

  79. 

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

  81.  * o-->o-->o   o

  82.  *         |  /|

  83.  * o   o   o / o

  84.  * | / |   |/  |

  85.  * o   o   o   o

  86.  *   /

  87.  * o-->o-->o-->o

  88.  */

  89. static const uint8_t svq3_scan[16] = {

  90.     0 + 0 * 4, 1 + 0 * 4, 2 + 0 * 4, 2 + 1 * 4,

  91.     2 + 2 * 4, 3 + 0 * 4, 3 + 1 * 4, 3 + 2 * 4,

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

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

  94. };

  95. 

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

  97.     { 0, 0 },

  98.     { 1, 0 }, { 0, 1 },

  99.     { 0, 2 }, { 1, 1 }, { 2, 0 },

  100.     { 3, 0 }, { 2, 1 }, { 1, 2 }, { 0, 3 },

  101.     { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

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

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

  104.     { 4, 3 }, { 3, 4 },

  105.     { 4, 4 }

  106. };

  107. 

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

  109.     { { 2, -1, -1, -1, -1 }, { 2, 1, -1, -1, -1 }, { 1, 2, -1, -1, -1 },

  110.       { 2,  1, -1, -1, -1 }, { 1, 2, -1, -1, -1 }, { 1, 2, -1, -1, -1 } },

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

  112.       { 0,  2,  1,  4,  3 }, { 2, 0,  1,  3,  4 }, { 0, 4,  2,  1,  3 } },

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

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

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

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

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

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

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

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

  121. };

  122. 

  123. static const struct {

  124.     uint8_t run;

  125.     uint8_t level;

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

  127.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  128.       { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

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

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

  131. };

  132. 

  133. static const uint32_t svq3_dequant_coeff[32] = {

  134.      3881,  4351,  4890,  5481,   6154,   6914,   7761,   8718,

  135.      9781, 10987, 12339, 13828,  15523,  17435,  19561,  21873,

  136.     24552, 27656, 30847, 34870,  38807,  43747,  49103,  54683,

  137.     61694, 68745, 77615, 89113, 100253, 109366, 126635, 141533

  138. };

  139. 

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

  141. {

  142.     const int qmul = svq3_dequant_coeff[qp];

  143. #define stride 16

  144.     int i;

  145.     int temp[16];

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

  147. 

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

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

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

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

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

  153. 

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

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

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

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

  158.     }

  159. 

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

  161.         const int offset = x_offset[i];

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

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

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

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

  166. 

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

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

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

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

  171.     }

  172. }

  173. #undef stride

  174. 

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

  176.                         int stride, int qp, int dc)

  177. {

  178.     const int qmul = svq3_dequant_coeff[qp];

  179.     int i;

  180. 

  181.     if (dc) {

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

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

  184.         block[0] = 0;

  185.     }

  186. 

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

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

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

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

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

  192. 

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

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

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

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

  197.     }

  198. 

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

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

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

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

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

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

  205. 

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

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

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

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

  210.     }

  211. }

  212. 

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

  214.                                     int index, const int type)

  215. {

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

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

  218. 

  219.     int run, level, limit;

  220.     unsigned vlc;

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

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

  223. 

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

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

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

  227.             vlc      = vlc + 1 >> 1;

  228. 

  229.             if (type == 3) {

  230.                 if (vlc < 3) {

  231.                     run   = 0;

  232.                     level = vlc;

  233.                 } else if (vlc < 4) {

  234.                     run   = 1;

  235.                     level = 1;

  236.                 } else {

  237.                     run   = vlc & 0x3;

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

  239.                 }

  240.             } else {

  241.                 if (vlc < 16) {

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

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

  244.                 } else if (intra) {

  245.                     run   = vlc & 0x7;

  246.                     level = (vlc >> 3) +

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

  248.                 } else {

  249.                     run   = vlc & 0xF;

  250.                     level = (vlc >> 4) +

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

  252.                 }

  253.             }

  254. 

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

  256.                 return -1;

  257. 

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

  259.         }

  260. 

  261.         if (type != 2) {

  262.             break;

  263.         }

  264.     }

  265. 

  266.     return 0;

  267. }

  268. 

  269. static inline void svq3_mc_dir_part(MpegEncContext *s,

  270.                                     int x, int y, int width, int height,

  271.                                     int mx, int my, int dxy,

  272.                                     int thirdpel, int dir, int avg)

  273. {

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

  275.     uint8_t *src, *dest;

  276.     int i, emu = 0;

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

  278. 

  279.     mx += x;

  280.     my += y;

  281. 

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

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

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

  285.             emu = 1;

  286. 

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

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

  289.     }

  290. 

  291.     /* form component predictions */

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

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

  294. 

  295.     if (emu) {

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

  297.                                 width + 1, height + 1,

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

  299.         src = s->edge_emu_buffer;

  300.     }

  301.     if (thirdpel)

  302.         (avg ? s->dsp.avg_tpel_pixels_tab

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

  304.                                                 width, height);

  305.     else

  306.         (avg ? s->dsp.avg_pixels_tab

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

  308.                                                       height);

  309. 

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

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

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

  313.         width  = width  >> 1;

  314.         height = height >> 1;

  315.         blocksize++;

  316. 

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

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

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

  320. 

  321.             if (emu) {

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

  323.                                         width + 1, height + 1,

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

  325.                                         s->v_edge_pos >> 1);

  326.                 src = s->edge_emu_buffer;

  327.             }

  328.             if (thirdpel)

  329.                 (avg ? s->dsp.avg_tpel_pixels_tab

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

  331.                                                         s->uvlinesize,

  332.                                                         width, height);

  333.             else

  334.                 (avg ? s->dsp.avg_pixels_tab

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

  336.                                                               s->uvlinesize,

  337.                                                               height);

  338.         }

  339.     }

  340. }

  341. 

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

  343.                               int dir, int avg)

  344. {

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

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

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

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

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

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

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

  352. 

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

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

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

  356.                              (4 * s->mb_y + (i >> 2)) * h->b_stride;

  357.             int dxy;

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

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

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

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

  362. 

  363.             if (mode != PREDICT_MODE) {

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

  365.             } else {

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

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

  368. 

  369.                 if (dir == 0) {

  370.                     mx = mx * h->frame_num_offset /

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

  372.                     my = my * h->frame_num_offset /

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

  374.                 } else {

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

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

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

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

  379.                 }

  380.             }

  381. 

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

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

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

  385. 

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

  387.             if (mode == PREDICT_MODE) {

  388.                 dx = dy = 0;

  389.             } else {

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

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

  392. 

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

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

  395.                     return -1;

  396.                 }

  397.             }

  398. 

  399.             /* compute motion vector */

  400.             if (mode == THIRDPEL_MODE) {

  401.                 int fx, fy;

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

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

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

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

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

  407. 

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

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

  410.                 mx += mx;

  411.                 my += my;

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

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

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

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

  416. 

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

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

  419.                 mx *= 3;

  420.                 my *= 3;

  421.             } else {

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

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

  424. 

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

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

  427.                 mx *= 6;

  428.                 my *= 6;

  429.             }

  430. 

  431.             /* update mv_cache */

  432.             if (mode != PREDICT_MODE) {

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

  434. 

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

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

  437. 

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

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

  440.                 }

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

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

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

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

  445.             }

  446. 

  447.             /* write back motion vectors */

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

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

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

  451.         }

  452. 

  453.     return 0;

  454. }

  455. 

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

  457. {

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

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

  460.     int cbp = 0;

  461.     uint32_t vlc;

  462.     int8_t *top, *left;

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

  464.     const int mb_xy         = h->mb_xy;

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

  466. 

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

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

  469.     h->topright_samples_available = 0xFFFF;

  470. 

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

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

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

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

  475.                              0, 0, 0, 0, 0, 0);

  476. 

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

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

  479.                                  0, 0, 0, 0, 1, 1);

  480. 

  481.             mb_type = MB_TYPE_SKIP;

  482.         } else {

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

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

  485.                 return -1;

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

  487.                 return -1;

  488. 

  489.             mb_type = MB_TYPE_16x16;

  490.         }

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

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

  493.             mode = THIRDPEL_MODE;

  494.         else if (svq3->halfpel_flag &&

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

  496.             mode = HALFPEL_MODE;

  497.         else

  498.             mode = FULLPEL_MODE;

  499. 

  500.         /* fill caches */

  501.         /* note ref_cache should contain here:

  502.          *  ????????

  503.          *  ???11111

  504.          *  N??11111

  505.          *  N??11111

  506.          *  N??11111

  507.          */

  508. 

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

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

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

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

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

  514.             } else {

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

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

  517.             }

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

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

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

  521.                        4 * 2 * sizeof(int16_t));

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

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

  524. 

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

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

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

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

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

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

  531.                 } else

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

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

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

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

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

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

  538.                 } else

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

  540.             } else

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

  542.                        PART_NOT_AVAILABLE, 8);

  543. 

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

  545.                 break;

  546.         }

  547. 

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

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

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

  551.                 return -1;

  552.         } else {        /* AV_PICTURE_TYPE_B */

  553.             if (mb_type != 2)

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

  555.                     return -1;

  556.             else

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

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

  559.                            0, 4 * 2 * sizeof(int16_t));

  560.             if (mb_type != 1)

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

  562.                     return -1;

  563.             else

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

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

  566.                            0, 4 * 2 * sizeof(int16_t));

  567.         }

  568. 

  569.         mb_type = MB_TYPE_16x16;

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

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

  572. 

  573.         if (mb_type == 8) {

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

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

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

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

  578.                     h->left_samples_available = 0x5F5F;

  579.             }

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

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

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

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

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

  585. 

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

  587.                     h->top_samples_available = 0x33FF;

  588.             }

  589. 

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

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

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

  593. 

  594.                 if (vlc >= 25) {

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

  596.                     return -1;

  597.                 }

  598. 

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

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

  601. 

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

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

  604. 

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

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

  607.                     return -1;

  608.                 }

  609.             }

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

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

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

  613.         }

  614. 

  615.         write_back_intra_pred_mode(h);

  616. 

  617.         if (mb_type == 8) {

  618.             ff_h264_check_intra4x4_pred_mode(h);

  619. 

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

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

  622.         } else {

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

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

  625. 

  626.             h->top_samples_available  = 0x33FF;

  627.             h->left_samples_available = 0x5F5F;

  628.         }

  629. 

  630.         mb_type = MB_TYPE_INTRA4x4;

  631.     } else {                      /* INTRA16x16 */

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

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

  634. 

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

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

  637.             return -1;

  638.         }

  639. 

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

  641.         mb_type = MB_TYPE_INTRA16x16;

  642.     }

  643. 

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

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

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

  647.                    0, 4 * 2 * sizeof(int16_t));

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

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

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

  651.                        0, 4 * 2 * sizeof(int16_t));

  652.         }

  653.     }

  654.     if (!IS_INTRA4x4(mb_type)) {

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

  656.     }

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

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

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

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

  661.     }

  662. 

  663.     if (!IS_INTRA16x16(mb_type) &&

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

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

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

  667.             return -1;

  668.         }

  669. 

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

  671.                                 : golomb_to_inter_cbp[vlc];

  672.     }

  673.     if (IS_INTRA16x16(mb_type) ||

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

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

  676. 

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

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

  679.             return -1;

  680.         }

  681.     }

  682.     if (IS_INTRA16x16(mb_type)) {

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

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

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

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

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

  688.             return -1;

  689.         }

  690.     }

  691. 

  692.     if (cbp) {

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

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

  695. 

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

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

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

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

  700.                                  2 * (j & 2) + 4 * (i & 2))

  701.                               : (4 * i + j);

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

  703. 

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

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

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

  707.                         return -1;

  708.                     }

  709.                 }

  710.             }

  711. 

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

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

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

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

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

  717.                     return -1;

  718.                 }

  719. 

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

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

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

  723.                         k                                 = 16 * i + j;

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

  725. 

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

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

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

  729.                             return -1;

  730.                         }

  731.                     }

  732.                 }

  733.             }

  734.         }

  735.     }

  736. 

  737.     h->cbp                              = cbp;

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

  739. 

  740.     if (IS_INTRA(mb_type))

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

  742. 

  743.     return 0;

  744. }

  745. 

  746. static int svq3_decode_slice_header(AVCodecContext *avctx)

  747. {

  748.     SVQ3Context *svq3 = avctx->priv_data;

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

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

  751.     const int mb_xy   = h->mb_xy;

  752.     int i, header;

  753. 

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

  755. 

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

  757.         /* TODO: what? */

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

  759.         return -1;

  760.     } else {

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

  762. 

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

  764.                                  8 * show_bits(&s->gb, 8 * length) +

  765.                                  8 * length;

  766. 

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

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

  769.             return -1;

  770.         }

  771. 

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

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

  774. 

  775.         if (svq3->watermark_key) {

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

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

  778.                     header ^ svq3->watermark_key);

  779.         }

  780.         if (length > 0) {

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

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

  783.         }

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

  785.     }

  786. 

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

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

  789.         return -1;

  790.     }

  791. 

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

  793. 

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

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

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

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

  798.     } else {

  799.         skip_bits1(&s->gb);

  800.         s->mb_skip_run = 0;

  801.     }

  802. 

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

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

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

  806. 

  807.     /* unknown fields */

  808.     skip_bits1(&s->gb);

  809. 

  810.     if (svq3->unknown_flag)

  811.         skip_bits1(&s->gb);

  812. 

  813.     skip_bits1(&s->gb);

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

  815. 

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

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

  818. 

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

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

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

  822.                -1, 4 * sizeof(int8_t));

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

  824.                -1, 8 * sizeof(int8_t) * s->mb_x);

  825.     }

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

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

  828.                -1, 8 * sizeof(int8_t) * (s->mb_width - s->mb_x));

  829. 

  830.         if (s->mb_x > 0)

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

  832.     }

  833. 

  834.     return 0;

  835. }

  836. 

  837. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  838. {

  839.     SVQ3Context *svq3 = avctx->priv_data;

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

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

  842.     int m;

  843.     unsigned char *extradata;

  844.     unsigned char *extradata_end;

  845.     unsigned int size;

  846.     int marker_found = 0;

  847. 

  848.     if (ff_h264_decode_init(avctx) < 0)

  849.         return -1;

  850. 

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

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

  853.     s->unrestricted_mv = 1;

  854.     h->is_complex      = 1;

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

  856. 

  857.     if (!s->context_initialized) {

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

  859. 

  860.         svq3->halfpel_flag  = 1;

  861.         svq3->thirdpel_flag = 1;

  862.         svq3->unknown_flag  = 0;

  863. 

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

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

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

  867.         if (extradata) {

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

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

  870.                     marker_found = 1;

  871.                     break;

  872.                 }

  873.                 extradata++;

  874.             }

  875.         }

  876. 

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

  878.         if (marker_found) {

  879.             GetBitContext gb;

  880.             int frame_size_code;

  881. 

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

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

  884.                 return AVERROR_INVALIDDATA;

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

  886. 

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

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

  889.             switch (frame_size_code) {

  890.             case 0:

  891.                 avctx->width  = 160;

  892.                 avctx->height = 120;

  893.                 break;

  894.             case 1:

  895.                 avctx->width  = 128;

  896.                 avctx->height =  96;

  897.                 break;

  898.             case 2:

  899.                 avctx->width  = 176;

  900.                 avctx->height = 144;

  901.                 break;

  902.             case 3:

  903.                 avctx->width  = 352;

  904.                 avctx->height = 288;

  905.                 break;

  906.             case 4:

  907.                 avctx->width  = 704;

  908.                 avctx->height = 576;

  909.                 break;

  910.             case 5:

  911.                 avctx->width  = 240;

  912.                 avctx->height = 180;

  913.                 break;

  914.             case 6:

  915.                 avctx->width  = 320;

  916.                 avctx->height = 240;

  917.                 break;

  918.             case 7:

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

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

  921.                 break;

  922.             }

  923. 

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

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

  926. 

  927.             /* unknown fields */

  928.             skip_bits1(&gb);

  929.             skip_bits1(&gb);

  930.             skip_bits1(&gb);

  931.             skip_bits1(&gb);

  932. 

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

  934. 

  935.             /* unknown field */

  936.             skip_bits1(&gb);

  937. 

  938.             while (get_bits1(&gb))

  939.                 skip_bits(&gb, 8);

  940. 

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

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

  943.             if (svq3->unknown_flag) {

  944. #if CONFIG_ZLIB

  945.                 unsigned watermark_width  = svq3_get_ue_golomb(&gb);

  946.                 unsigned watermark_height = svq3_get_ue_golomb(&gb);

  947.                 int u1                    = svq3_get_ue_golomb(&gb);

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

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

  950.                 int u4                    = svq3_get_ue_golomb(&gb);

  951.                 unsigned long buf_len     = watermark_width *

  952.                                             watermark_height * 4;

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

  954.                 uint8_t *buf;

  955. 

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

  957.                     return -1;

  958. 

  959.                 buf = av_malloc(buf_len);

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

  961.                        watermark_width, watermark_height);

  962.                 av_log(avctx, AV_LOG_DEBUG,

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

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

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

  966.                                size - offset) != Z_OK) {

  967.                     av_log(avctx, AV_LOG_ERROR,

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

  969.                     av_free(buf);

  970.                     return -1;

  971.                 }

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

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

  974.                                       svq3->watermark_key;

  975.                 av_log(avctx, AV_LOG_DEBUG,

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

  977.                 av_free(buf);

  978. #else

  979.                 av_log(avctx, AV_LOG_ERROR,

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

  981.                 return -1;

  982. #endif

  983.             }

  984.         }

  985. 

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

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

  988. 

  989.         if (ff_MPV_common_init(s) < 0)

  990.             return -1;

  991. 

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

  993. 

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

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

  996.             return AVERROR(ENOMEM);

  997.         }

  998.     }

  999. 

  1000.     return 0;

  1001. }

  1002. 

  1003. static int svq3_decode_frame(AVCodecContext *avctx, void *data,

  1004.                              int *got_frame, AVPacket *avpkt)

  1005. {

  1006.     const uint8_t *buf = avpkt->data;

  1007.     SVQ3Context *svq3  = avctx->priv_data;

  1008.     H264Context *h     = &svq3->h;

  1009.     MpegEncContext *s  = &h->s;

  1010.     int buf_size       = avpkt->size;

  1011.     int m;

  1012. 

  1013.     /* special case for last picture */

  1014.     if (buf_size == 0) {

  1015.         if (s->next_picture_ptr && !s->low_delay) {

  1016.             *(AVFrame *) data   = s->next_picture.f;

  1017.             s->next_picture_ptr = NULL;

  1018.             *got_frame          = 1;

  1019.         }

  1020.         return 0;

  1021.     }

  1022. 

  1023.     init_get_bits(&s->gb, buf, 8 * buf_size);

  1024. 

  1025.     s->mb_x = s->mb_y = h->mb_xy = 0;

  1026. 

  1027.     if (svq3_decode_slice_header(avctx))

  1028.         return -1;

  1029. 

  1030.     s->pict_type      = h->slice_type;

  1031.     s->picture_number = h->slice_num;

  1032. 

  1033.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  1034.         av_log(h->s.avctx, AV_LOG_DEBUG,

  1035.                "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n",

  1036.                av_get_picture_type_char(s->pict_type),

  1037.                svq3->halfpel_flag, svq3->thirdpel_flag,

  1038.                s->adaptive_quant, s->qscale, h->slice_num);

  1039. 

  1040.     /* for skipping the frame */

  1041.     s->current_picture.f.pict_type = s->pict_type;

  1042.     s->current_picture.f.key_frame = (s->pict_type == AV_PICTURE_TYPE_I);

  1043. 

  1044.     /* Skip B-frames if we do not have reference frames. */

  1045.     if (s->last_picture_ptr == NULL && s->pict_type == AV_PICTURE_TYPE_B)

  1046.         return 0;

  1047.     if (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B ||

  1048.         avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I ||

  1049.         avctx->skip_frame >= AVDISCARD_ALL)

  1050.         return 0;

  1051. 

  1052.     if (s->next_p_frame_damaged) {

  1053.         if (s->pict_type == AV_PICTURE_TYPE_B)

  1054.             return 0;

  1055.         else

  1056.             s->next_p_frame_damaged = 0;

  1057.     }

  1058. 

  1059.     if (ff_h264_frame_start(h) < 0)

  1060.         return -1;

  1061. 

  1062.     if (s->pict_type == AV_PICTURE_TYPE_B) {

  1063.         h->frame_num_offset = h->slice_num - h->prev_frame_num;

  1064. 

  1065.         if (h->frame_num_offset < 0)

  1066.             h->frame_num_offset += 256;

  1067.         if (h->frame_num_offset == 0 ||

  1068.             h->frame_num_offset >= h->prev_frame_num_offset) {

  1069.             av_log(h->s.avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  1070.             return -1;

  1071.         }

  1072.     } else {

  1073.         h->prev_frame_num        = h->frame_num;

  1074.         h->frame_num             = h->slice_num;

  1075.         h->prev_frame_num_offset = h->frame_num - h->prev_frame_num;

  1076. 

  1077.         if (h->prev_frame_num_offset < 0)

  1078.             h->prev_frame_num_offset += 256;

  1079.     }

  1080. 

  1081.     for (m = 0; m < 2; m++) {

  1082.         int i;

  1083.         for (i = 0; i < 4; i++) {

  1084.             int j;

  1085.             for (j = -1; j < 4; j++)

  1086.                 h->ref_cache[m][scan8[0] + 8 * i + j] = 1;

  1087.             if (i < 3)

  1088.                 h->ref_cache[m][scan8[0] + 8 * i + j] = PART_NOT_AVAILABLE;

  1089.         }

  1090.     }

  1091. 

  1092.     for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  1093.         for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  1094.             unsigned mb_type;

  1095.             h->mb_xy = s->mb_x + s->mb_y * s->mb_stride;

  1096. 

  1097.             if ((get_bits_count(&s->gb) + 7) >= s->gb.size_in_bits &&

  1098.                 ((get_bits_count(&s->gb) & 7) == 0 ||

  1099.                  show_bits(&s->gb, -get_bits_count(&s->gb) & 7) == 0)) {

  1100.                 skip_bits(&s->gb, svq3->next_slice_index - get_bits_count(&s->gb));

  1101.                 s->gb.size_in_bits = 8 * buf_size;

  1102. 

  1103.                 if (svq3_decode_slice_header(avctx))

  1104.                     return -1;

  1105. 

  1106.                 /* TODO: support s->mb_skip_run */

  1107.             }

  1108. 

  1109.             mb_type = svq3_get_ue_golomb(&s->gb);

  1110. 

  1111.             if (s->pict_type == AV_PICTURE_TYPE_I)

  1112.                 mb_type += 8;

  1113.             else if (s->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4)

  1114.                 mb_type += 4;

  1115.             if (mb_type > 33 || svq3_decode_mb(svq3, mb_type)) {

  1116.                 av_log(h->s.avctx, AV_LOG_ERROR,

  1117.                        "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1118.                 return -1;

  1119.             }

  1120. 

  1121.             if (mb_type != 0)

  1122.                 ff_h264_hl_decode_mb(h);

  1123. 

  1124.             if (s->pict_type != AV_PICTURE_TYPE_B && !s->low_delay)

  1125.                 s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] =

  1126.                     (s->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1127.         }

  1128. 

  1129.         ff_draw_horiz_band(s, 16 * s->mb_y, 16);

  1130.     }

  1131. 

  1132.     ff_MPV_frame_end(s);

  1133. 

  1134.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay)

  1135.         *(AVFrame *)data = s->current_picture.f;

  1136.     else

  1137.         *(AVFrame *)data = s->last_picture.f;

  1138. 

  1139.     /* Do not output the last pic after seeking. */

  1140.     if (s->last_picture_ptr || s->low_delay)

  1141.         *got_frame = 1;

  1142. 

  1143.     return buf_size;

  1144. }

  1145. 

  1146. static int svq3_decode_end(AVCodecContext *avctx)

  1147. {

  1148.     SVQ3Context *svq3 = avctx->priv_data;

  1149.     H264Context *h    = &svq3->h;

  1150.     MpegEncContext *s = &h->s;

  1151. 

  1152.     ff_h264_free_context(h);

  1153. 

  1154.     ff_MPV_common_end(s);

  1155. 

  1156.     return 0;

  1157. }

  1158. 

  1159. AVCodec ff_svq3_decoder = {

  1160.     .name           = "svq3",

  1161.     .type           = AVMEDIA_TYPE_VIDEO,

  1162.     .id             = AV_CODEC_ID_SVQ3,

  1163.     .priv_data_size = sizeof(SVQ3Context),

  1164.     .init           = svq3_decode_init,

  1165.     .close          = svq3_decode_end,

  1166.     .decode         = svq3_decode_frame,

  1167.     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND |

  1168.                       CODEC_CAP_DR1             |

  1169.                       CODEC_CAP_DELAY,

  1170.     .long_name      = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1171.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P,

  1172.                                                      AV_PIX_FMT_NONE},

  1173. };