falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
43154 Commits
32 Branches
580MB
Tree: 33b83d89e3
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '33b83d89e3'
${ noResults }
FFmpeg/libavcodec/svq3.c

1586 lines
56KB
Raw Blame History 

  1. /*

  2.  * Copyright (c) 2003 The Libav Project

  3.  *

  4.  * This file is part of Libav.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. /*

  22.  * How to use this decoder:

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

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

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

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

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

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

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

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

  31.  *

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

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

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

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

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

  37.  *

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

  39.  * correctly decodes this file:

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

  41.  */

  42. 

  43. #include <inttypes.h>

  44. 

  45. #include "libavutil/attributes.h"

  46. #include "internal.h"

  47. #include "avcodec.h"

  48. #include "mpegutils.h"

  49. #include "h264.h"

  50. #include "h264data.h"

  51. #include "golomb.h"

  52. #include "hpeldsp.h"

  53. #include "mathops.h"

  54. #include "rectangle.h"

  55. #include "tpeldsp.h"

  56. 

  57. #if CONFIG_ZLIB

  58. #include <zlib.h>

  59. #endif

  60. 

  61. #include "svq1.h"

  62. 

  63. /**

  64.  * @file

  65.  * svq3 decoder.

  66.  */

  67. 

  68. typedef struct SVQ3Context {

  69.     AVCodecContext *avctx;

  70. 

  71.     H264DSPContext  h264dsp;

  72.     H264PredContext hpc;

  73.     HpelDSPContext hdsp;

  74.     TpelDSPContext tdsp;

  75.     VideoDSPContext vdsp;

  76. 

  77.     H264Picture *cur_pic;

  78.     H264Picture *next_pic;

  79.     H264Picture *last_pic;

  80.     GetBitContext gb;

  81.     GetBitContext gb_slice;

  82.     uint8_t *slice_buf;

  83.     int slice_size;

  84.     int halfpel_flag;

  85.     int thirdpel_flag;

  86.     int unknown_flag;

  87.     uint32_t watermark_key;

  88.     int adaptive_quant;

  89.     int next_p_frame_damaged;

  90.     int h_edge_pos;

  91.     int v_edge_pos;

  92.     int last_frame_output;

  93.     int slice_num;

  94.     int qscale;

  95.     int cbp;

  96.     int frame_num;

  97.     int frame_num_offset;

  98.     int prev_frame_num_offset;

  99.     int prev_frame_num;

  100. 

  101.     enum AVPictureType pict_type;

  102.     int low_delay;

  103. 

  104.     int mb_x, mb_y;

  105.     int mb_xy;

  106.     int mb_width, mb_height;

  107.     int mb_stride, mb_num;

  108.     int b_stride;

  109. 

  110.     uint32_t *mb2br_xy;

  111. 

  112.     int chroma_pred_mode;

  113.     int intra16x16_pred_mode;

  114. 

  115.     int8_t   intra4x4_pred_mode_cache[5 * 8];

  116.     int8_t (*intra4x4_pred_mode);

  117. 

  118.     unsigned int top_samples_available;

  119.     unsigned int topright_samples_available;

  120.     unsigned int left_samples_available;

  121. 

  122.     uint8_t *edge_emu_buffer;

  123. 

  124.     DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5 * 8][2];

  125.     DECLARE_ALIGNED(8,  int8_t, ref_cache)[2][5 * 8];

  126.     DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2];

  127.     DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];

  128.     DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15 * 8];

  129.     uint32_t dequant4_coeff[QP_MAX_NUM + 1][16];

  130.     int block_offset[2 * (16 * 3)];

  131. } SVQ3Context;

  132. 

  133. #define FULLPEL_MODE  1

  134. #define HALFPEL_MODE  2

  135. #define THIRDPEL_MODE 3

  136. #define PREDICT_MODE  4

  137. 

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

  139.  * o-->o-->o   o

  140.  *         |  /|

  141.  * o   o   o / o

  142.  * | / |   |/  |

  143.  * o   o   o   o

  144.  *   /

  145.  * o-->o-->o-->o

  146.  */

  147. static const uint8_t svq3_scan[16] = {

  148.     0 + 0 * 4, 1 + 0 * 4, 2 + 0 * 4, 2 + 1 * 4,

  149.     2 + 2 * 4, 3 + 0 * 4, 3 + 1 * 4, 3 + 2 * 4,

  150.     0 + 1 * 4, 0 + 2 * 4, 1 + 1 * 4, 1 + 2 * 4,

  151.     0 + 3 * 4, 1 + 3 * 4, 2 + 3 * 4, 3 + 3 * 4,

  152. };

  153. 

  154. static const uint8_t luma_dc_zigzag_scan[16] = {

  155.     0 * 16 + 0 * 64, 1 * 16 + 0 * 64, 2 * 16 + 0 * 64, 0 * 16 + 2 * 64,

  156.     3 * 16 + 0 * 64, 0 * 16 + 1 * 64, 1 * 16 + 1 * 64, 2 * 16 + 1 * 64,

  157.     1 * 16 + 2 * 64, 2 * 16 + 2 * 64, 3 * 16 + 2 * 64, 0 * 16 + 3 * 64,

  158.     3 * 16 + 1 * 64, 1 * 16 + 3 * 64, 2 * 16 + 3 * 64, 3 * 16 + 3 * 64,

  159. };

  160. 

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

  162.     { 0, 0 },

  163.     { 1, 0 }, { 0, 1 },

  164.     { 0, 2 }, { 1, 1 }, { 2, 0 },

  165.     { 3, 0 }, { 2, 1 }, { 1, 2 }, { 0, 3 },

  166.     { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

  167.     { 4, 1 }, { 3, 2 }, { 2, 3 }, { 1, 4 },

  168.     { 2, 4 }, { 3, 3 }, { 4, 2 },

  169.     { 4, 3 }, { 3, 4 },

  170.     { 4, 4 }

  171. };

  172. 

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

  174.     { { 2, -1, -1, -1, -1 }, { 2, 1, -1, -1, -1 }, { 1, 2, -1, -1, -1 },

  175.       { 2,  1, -1, -1, -1 }, { 1, 2, -1, -1, -1 }, { 1, 2, -1, -1, -1 } },

  176.     { { 0,  2, -1, -1, -1 }, { 0, 2,  1,  4,  3 }, { 0, 1,  2,  4,  3 },

  177.       { 0,  2,  1,  4,  3 }, { 2, 0,  1,  3,  4 }, { 0, 4,  2,  1,  3 } },

  178.     { { 2,  0, -1, -1, -1 }, { 2, 1,  0,  4,  3 }, { 1, 2,  4,  0,  3 },

  179.       { 2,  1,  0,  4,  3 }, { 2, 1,  4,  3,  0 }, { 1, 2,  4,  0,  3 } },

  180.     { { 2,  0, -1, -1, -1 }, { 2, 0,  1,  4,  3 }, { 1, 2,  0,  4,  3 },

  181.       { 2,  1,  0,  4,  3 }, { 2, 1,  3,  4,  0 }, { 2, 4,  1,  0,  3 } },

  182.     { { 0,  2, -1, -1, -1 }, { 0, 2,  1,  3,  4 }, { 1, 2,  3,  0,  4 },

  183.       { 2,  0,  1,  3,  4 }, { 2, 1,  3,  0,  4 }, { 2, 0,  4,  3,  1 } },

  184.     { { 0,  2, -1, -1, -1 }, { 0, 2,  4,  1,  3 }, { 1, 4,  2,  0,  3 },

  185.       { 4,  2,  0,  1,  3 }, { 2, 0,  1,  4,  3 }, { 4, 2,  1,  0,  3 } },

  186. };

  187. 

  188. static const struct {

  189.     uint8_t run;

  190.     uint8_t level;

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

  192.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  193.       { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  194.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  195.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  196. };

  197. 

  198. static const uint32_t svq3_dequant_coeff[32] = {

  199.      3881,  4351,  4890,  5481,   6154,   6914,   7761,   8718,

  200.      9781, 10987, 12339, 13828,  15523,  17435,  19561,  21873,

  201.     24552, 27656, 30847, 34870,  38807,  43747,  49103,  54683,

  202.     61694, 68745, 77615, 89113, 100253, 109366, 126635, 141533

  203. };

  204. 

  205. static void svq3_luma_dc_dequant_idct_c(int16_t *output, int16_t *input, int qp)

  206. {

  207.     const int qmul = svq3_dequant_coeff[qp];

  208. #define stride 16

  209.     int i;

  210.     int temp[16];

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

  212. 

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

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

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

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

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

  218. 

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

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

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

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

  223.     }

  224. 

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

  226.         const int offset = x_offset[i];

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

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

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

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

  231. 

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

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

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

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

  236.     }

  237. }

  238. #undef stride

  239. 

  240. static void svq3_add_idct_c(uint8_t *dst, int16_t *block,

  241.                             int stride, int qp, int dc)

  242. {

  243.     const int qmul = svq3_dequant_coeff[qp];

  244.     int i;

  245. 

  246.     if (dc) {

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

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

  249.         block[0] = 0;

  250.     }

  251. 

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

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

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

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

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

  257. 

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

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

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

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

  262.     }

  263. 

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

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

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

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

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

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

  270. 

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

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

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

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

  275.     }

  276. 

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

  278. }

  279. 

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

  281.                                     int index, const int type)

  282. {

  283.     static const uint8_t *const scan_patterns[4] = {

  284.         luma_dc_zigzag_scan, ff_zigzag_scan, svq3_scan, ff_h264_chroma_dc_scan

  285.     };

  286. 

  287.     int run, level, limit;

  288.     unsigned vlc;

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

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

  291. 

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

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

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

  295.             vlc      = vlc + 1 >> 1;

  296. 

  297.             if (type == 3) {

  298.                 if (vlc < 3) {

  299.                     run   = 0;

  300.                     level = vlc;

  301.                 } else if (vlc < 4) {

  302.                     run   = 1;

  303.                     level = 1;

  304.                 } else {

  305.                     run   = vlc & 0x3;

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

  307.                 }

  308.             } else {

  309.                 if (vlc < 16) {

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

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

  312.                 } else if (intra) {

  313.                     run   = vlc & 0x7;

  314.                     level = (vlc >> 3) +

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

  316.                 } else {

  317.                     run   = vlc & 0xF;

  318.                     level = (vlc >> 4) +

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

  320.                 }

  321.             }

  322. 

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

  324.                 return -1;

  325. 

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

  327.         }

  328. 

  329.         if (type != 2) {

  330.             break;

  331.         }

  332.     }

  333. 

  334.     return 0;

  335. }

  336. 

  337. static av_always_inline int

  338. svq3_fetch_diagonal_mv(const SVQ3Context *s, const int16_t **C,

  339.                        int i, int list, int part_width)

  340. {

  341.     const int topright_ref = s->ref_cache[list][i - 8 + part_width];

  342. 

  343.     if (topright_ref != PART_NOT_AVAILABLE) {

  344.         *C = s->mv_cache[list][i - 8 + part_width];

  345.         return topright_ref;

  346.     } else {

  347.         *C = s->mv_cache[list][i - 8 - 1];

  348.         return s->ref_cache[list][i - 8 - 1];

  349.     }

  350. }

  351. 

  352. /**

  353.  * Get the predicted MV.

  354.  * @param n the block index

  355.  * @param part_width the width of the partition (4, 8,16) -> (1, 2, 4)

  356.  * @param mx the x component of the predicted motion vector

  357.  * @param my the y component of the predicted motion vector

  358.  */

  359. static av_always_inline void svq3_pred_motion(const SVQ3Context *s, int n,

  360.                                               int part_width, int list,

  361.                                               int ref, int *const mx, int *const my)

  362. {

  363.     const int index8       = scan8[n];

  364.     const int top_ref      = s->ref_cache[list][index8 - 8];

  365.     const int left_ref     = s->ref_cache[list][index8 - 1];

  366.     const int16_t *const A = s->mv_cache[list][index8 - 1];

  367.     const int16_t *const B = s->mv_cache[list][index8 - 8];

  368.     const int16_t *C;

  369.     int diagonal_ref, match_count;

  370. 

  371. /* mv_cache

  372.  * B . . A T T T T

  373.  * U . . L . . , .

  374.  * U . . L . . . .

  375.  * U . . L . . , .

  376.  * . . . L . . . .

  377.  */

  378. 

  379.     diagonal_ref = svq3_fetch_diagonal_mv(s, &C, index8, list, part_width);

  380.     match_count  = (diagonal_ref == ref) + (top_ref == ref) + (left_ref == ref);

  381.     if (match_count > 1) { //most common

  382.         *mx = mid_pred(A[0], B[0], C[0]);

  383.         *my = mid_pred(A[1], B[1], C[1]);

  384.     } else if (match_count == 1) {

  385.         if (left_ref == ref) {

  386.             *mx = A[0];

  387.             *my = A[1];

  388.         } else if (top_ref == ref) {

  389.             *mx = B[0];

  390.             *my = B[1];

  391.         } else {

  392.             *mx = C[0];

  393.             *my = C[1];

  394.         }

  395.     } else {

  396.         if (top_ref      == PART_NOT_AVAILABLE &&

  397.             diagonal_ref == PART_NOT_AVAILABLE &&

  398.             left_ref     != PART_NOT_AVAILABLE) {

  399.             *mx = A[0];

  400.             *my = A[1];

  401.         } else {

  402.             *mx = mid_pred(A[0], B[0], C[0]);

  403.             *my = mid_pred(A[1], B[1], C[1]);

  404.         }

  405.     }

  406. }

  407. 

  408. static inline void svq3_mc_dir_part(SVQ3Context *s,

  409.                                     int x, int y, int width, int height,

  410.                                     int mx, int my, int dxy,

  411.                                     int thirdpel, int dir, int avg)

  412. {

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

  414.     uint8_t *src, *dest;

  415.     int i, emu = 0;

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

  417.     int linesize   = s->cur_pic->f->linesize[0];

  418.     int uvlinesize = s->cur_pic->f->linesize[1];

  419. 

  420.     mx += x;

  421.     my += y;

  422. 

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

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

  425.         emu = 1;

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

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

  428.     }

  429. 

  430.     /* form component predictions */

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

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

  433. 

  434.     if (emu) {

  435.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, src,

  436.                                  linesize, linesize,

  437.                                  width + 1, height + 1,

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

  439.         src = s->edge_emu_buffer;

  440.     }

  441.     if (thirdpel)

  442.         (avg ? s->tdsp.avg_tpel_pixels_tab

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

  444.                                                  width, height);

  445.     else

  446.         (avg ? s->hdsp.avg_pixels_tab

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

  448.                                                        height);

  449. 

  450.     if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {

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

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

  453.         width  = width  >> 1;

  454.         height = height >> 1;

  455.         blocksize++;

  456. 

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

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

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

  460. 

  461.             if (emu) {

  462.                 s->vdsp.emulated_edge_mc(s->edge_emu_buffer, src,

  463.                                          uvlinesize, uvlinesize,

  464.                                          width + 1, height + 1,

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

  466.                                          s->v_edge_pos >> 1);

  467.                 src = s->edge_emu_buffer;

  468.             }

  469.             if (thirdpel)

  470.                 (avg ? s->tdsp.avg_tpel_pixels_tab

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

  472.                                                          uvlinesize,

  473.                                                          width, height);

  474.             else

  475.                 (avg ? s->hdsp.avg_pixels_tab

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

  477.                                                                uvlinesize,

  478.                                                                height);

  479.         }

  480.     }

  481. }

  482. 

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

  484.                               int dir, int avg)

  485. {

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

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

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

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

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

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

  492. 

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

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

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

  496.                              (4 * s->mb_y + (i >> 2)) * s->b_stride;

  497.             int dxy;

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

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

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

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

  502. 

  503.             if (mode != PREDICT_MODE) {

  504.                 svq3_pred_motion(s, k, part_width >> 2, dir, 1, &mx, &my);

  505.             } else {

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

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

  508. 

  509.                 if (dir == 0) {

  510.                     mx = mx * s->frame_num_offset /

  511.                          s->prev_frame_num_offset + 1 >> 1;

  512.                     my = my * s->frame_num_offset /

  513.                          s->prev_frame_num_offset + 1 >> 1;

  514.                 } else {

  515.                     mx = mx * (s->frame_num_offset - s->prev_frame_num_offset) /

  516.                          s->prev_frame_num_offset + 1 >> 1;

  517.                     my = my * (s->frame_num_offset - s->prev_frame_num_offset) /

  518.                          s->prev_frame_num_offset + 1 >> 1;

  519.                 }

  520.             }

  521. 

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

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

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

  525. 

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

  527.             if (mode == PREDICT_MODE) {

  528.                 dx = dy = 0;

  529.             } else {

  530.                 dy = svq3_get_se_golomb(&s->gb_slice);

  531.                 dx = svq3_get_se_golomb(&s->gb_slice);

  532. 

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

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

  535.                     return -1;

  536.                 }

  537.             }

  538. 

  539.             /* compute motion vector */

  540.             if (mode == THIRDPEL_MODE) {

  541.                 int fx, fy;

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

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

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

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

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

  547. 

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

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

  550.                 mx += mx;

  551.                 my += my;

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

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

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

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

  556. 

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

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

  559.                 mx *= 3;

  560.                 my *= 3;

  561.             } else {

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

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

  564. 

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

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

  567.                 mx *= 6;

  568.                 my *= 6;

  569.             }

  570. 

  571.             /* update mv_cache */

  572.             if (mode != PREDICT_MODE) {

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

  574. 

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

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

  577. 

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

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

  580.                 }

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

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

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

  584.                     AV_WN32A(s->mv_cache[dir][scan8[k]], mv);

  585.             }

  586. 

  587.             /* write back motion vectors */

  588.             fill_rectangle(s->cur_pic->motion_val[dir][b_xy],

  589.                            part_width >> 2, part_height >> 2, s->b_stride,

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

  591.         }

  592. 

  593.     return 0;

  594. }

  595. 

  596. static av_always_inline void hl_decode_mb_idct_luma(SVQ3Context *s,

  597.                                                     int mb_type, const int *block_offset,

  598.                                                     int linesize, uint8_t *dest_y)

  599. {

  600.     int i;

  601.     if (!IS_INTRA4x4(mb_type)) {

  602.         for (i = 0; i < 16; i++)

  603.             if (s->non_zero_count_cache[scan8[i]] || s->mb[i * 16]) {

  604.                 uint8_t *const ptr = dest_y + block_offset[i];

  605.                 svq3_add_idct_c(ptr, s->mb + i * 16, linesize,

  606.                                 s->qscale, IS_INTRA(mb_type) ? 1 : 0);

  607.             }

  608.     }

  609. }

  610. 

  611. static av_always_inline int dctcoef_get(int16_t *mb, int index)

  612. {

  613.     return AV_RN16A(mb + index);

  614. }

  615. 

  616. static av_always_inline void hl_decode_mb_predict_luma(SVQ3Context *s,

  617.                                                        int mb_type,

  618.                                                        const int *block_offset,

  619.                                                        int linesize,

  620.                                                        uint8_t *dest_y)

  621. {

  622.     int i;

  623.     int qscale = s->qscale;

  624. 

  625.     if (IS_INTRA4x4(mb_type)) {

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

  627.             uint8_t *const ptr = dest_y + block_offset[i];

  628.             const int dir      = s->intra4x4_pred_mode_cache[scan8[i]];

  629. 

  630.             uint8_t *topright;

  631.             int nnz, tr;

  632.             if (dir == DIAG_DOWN_LEFT_PRED || dir == VERT_LEFT_PRED) {

  633.                 const int topright_avail = (s->topright_samples_available << i) & 0x8000;

  634.                 assert(s->mb_y || linesize <= block_offset[i]);

  635.                 if (!topright_avail) {

  636.                     tr       = ptr[3 - linesize] * 0x01010101u;

  637.                     topright = (uint8_t *)&tr;

  638.                 } else

  639.                     topright = ptr + 4 - linesize;

  640.             } else

  641.                 topright = NULL;

  642. 

  643.             s->hpc.pred4x4[dir](ptr, topright, linesize);

  644.             nnz = s->non_zero_count_cache[scan8[i]];

  645.             if (nnz) {

  646.                 svq3_add_idct_c(ptr, s->mb + i * 16, linesize, qscale, 0);

  647.             }

  648.         }

  649.     } else {

  650.         s->hpc.pred16x16[s->intra16x16_pred_mode](dest_y, linesize);

  651.         svq3_luma_dc_dequant_idct_c(s->mb, s->mb_luma_dc[0], qscale);

  652.     }

  653. }

  654. 

  655. static void hl_decode_mb(SVQ3Context *s)

  656. {

  657.     const int mb_x    = s->mb_x;

  658.     const int mb_y    = s->mb_y;

  659.     const int mb_xy   = s->mb_xy;

  660.     const int mb_type = s->cur_pic->mb_type[mb_xy];

  661.     uint8_t *dest_y, *dest_cb, *dest_cr;

  662.     int linesize, uvlinesize;

  663.     int i, j;

  664.     const int *block_offset = &s->block_offset[0];

  665.     const int block_h   = 16 >> 1;

  666. 

  667.     linesize   = s->cur_pic->f->linesize[0];

  668.     uvlinesize = s->cur_pic->f->linesize[1];

  669. 

  670.     dest_y  = s->cur_pic->f->data[0] + (mb_x     + mb_y * linesize)  * 16;

  671.     dest_cb = s->cur_pic->f->data[1] +  mb_x * 8 + mb_y * uvlinesize * block_h;

  672.     dest_cr = s->cur_pic->f->data[2] +  mb_x * 8 + mb_y * uvlinesize * block_h;

  673. 

  674.     s->vdsp.prefetch(dest_y  + (s->mb_x & 3) * 4 * linesize   + 64, linesize,      4);

  675.     s->vdsp.prefetch(dest_cb + (s->mb_x & 7)     * uvlinesize + 64, dest_cr - dest_cb, 2);

  676. 

  677.     if (IS_INTRA(mb_type)) {

  678.         s->hpc.pred8x8[s->chroma_pred_mode](dest_cb, uvlinesize);

  679.         s->hpc.pred8x8[s->chroma_pred_mode](dest_cr, uvlinesize);

  680. 

  681.         hl_decode_mb_predict_luma(s, mb_type, block_offset, linesize, dest_y);

  682.     }

  683. 

  684.     hl_decode_mb_idct_luma(s, mb_type, block_offset, linesize, dest_y);

  685. 

  686.     if (s->cbp & 0x30) {

  687.         uint8_t *dest[2] = { dest_cb, dest_cr };

  688.         s->h264dsp.h264_chroma_dc_dequant_idct(s->mb + 16 * 16 * 1,

  689.                                                s->dequant4_coeff[4][0]);

  690.         s->h264dsp.h264_chroma_dc_dequant_idct(s->mb + 16 * 16 * 2,

  691.                                                s->dequant4_coeff[4][0]);

  692.         for (j = 1; j < 3; j++) {

  693.             for (i = j * 16; i < j * 16 + 4; i++)

  694.                 if (s->non_zero_count_cache[scan8[i]] || s->mb[i * 16]) {

  695.                     uint8_t *const ptr = dest[j - 1] + block_offset[i];

  696.                     svq3_add_idct_c(ptr, s->mb + i * 16,

  697.                                     uvlinesize, ff_h264_chroma_qp[0][s->qscale + 12] - 12, 2);

  698.                 }

  699.         }

  700.     }

  701. }

  702. 

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

  704. {

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

  706.     int cbp = 0;

  707.     uint32_t vlc;

  708.     int8_t *top, *left;

  709.     const int mb_xy = s->mb_xy;

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

  711. 

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

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

  714.     s->topright_samples_available = 0xFFFF;

  715. 

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

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

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

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

  720.                              0, 0, 0, 0, 0, 0);

  721. 

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

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

  724.                                  0, 0, 0, 0, 1, 1);

  725. 

  726.             mb_type = MB_TYPE_SKIP;

  727.         } else {

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

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

  730.                 return -1;

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

  732.                 return -1;

  733. 

  734.             mb_type = MB_TYPE_16x16;

  735.         }

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

  737.         if (s->thirdpel_flag && s->halfpel_flag == !get_bits1(&s->gb_slice))

  738.             mode = THIRDPEL_MODE;

  739.         else if (s->halfpel_flag &&

  740.                  s->thirdpel_flag == !get_bits1(&s->gb_slice))

  741.             mode = HALFPEL_MODE;

  742.         else

  743.             mode = FULLPEL_MODE;

  744. 

  745.         /* fill caches */

  746.         /* note ref_cache should contain here:

  747.          *  ????????

  748.          *  ???11111

  749.          *  N??11111

  750.          *  N??11111

  751.          *  N??11111

  752.          */

  753. 

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

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

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

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

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

  759.             } else {

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

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

  762.             }

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

  764.                 memcpy(s->mv_cache[m][scan8[0] - 1 * 8],

  765.                        s->cur_pic->motion_val[m][b_xy - s->b_stride],

  766.                        4 * 2 * sizeof(int16_t));

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

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

  769. 

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

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

  772.                               s->cur_pic->motion_val[m][b_xy - s->b_stride + 4]);

  773.                     s->ref_cache[m][scan8[0] + 4 - 1 * 8] =

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

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

  776.                 } else

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

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

  779.                     AV_COPY32(s->mv_cache[m][scan8[0] - 1 - 1 * 8],

  780.                               s->cur_pic->motion_val[m][b_xy - s->b_stride - 1]);

  781.                     s->ref_cache[m][scan8[0] - 1 - 1 * 8] =

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

  783.                 } else

  784.                     s->ref_cache[m][scan8[0] - 1 - 1 * 8] = PART_NOT_AVAILABLE;

  785.             } else

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

  787.                        PART_NOT_AVAILABLE, 8);

  788. 

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

  790.                 break;

  791.         }

  792. 

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

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

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

  796.                 return -1;

  797.         } else {        /* AV_PICTURE_TYPE_B */

  798.             if (mb_type != 2) {

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

  800.                     return -1;

  801.             } else {

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

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

  804.                            0, 4 * 2 * sizeof(int16_t));

  805.             }

  806.             if (mb_type != 1) {

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

  808.                     return -1;

  809.             } else {

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

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

  812.                            0, 4 * 2 * sizeof(int16_t));

  813.             }

  814.         }

  815. 

  816.         mb_type = MB_TYPE_16x16;

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

  818.         int8_t *i4x4       = s->intra4x4_pred_mode + s->mb2br_xy[s->mb_xy];

  819.         int8_t *i4x4_cache = s->intra4x4_pred_mode_cache;

  820. 

  821.         memset(s->intra4x4_pred_mode_cache, -1, 8 * 5 * sizeof(int8_t));

  822. 

  823.         if (mb_type == 8) {

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

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

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

  827.                 if (s->intra4x4_pred_mode_cache[scan8[0] - 1] == -1)

  828.                     s->left_samples_available = 0x5F5F;

  829.             }

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

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

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

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

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

  835. 

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

  837.                     s->top_samples_available = 0x33FF;

  838.             }

  839. 

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

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

  842.                 vlc = svq3_get_ue_golomb(&s->gb_slice);

  843. 

  844.                 if (vlc >= 25) {

  845.                     av_log(s->avctx, AV_LOG_ERROR,

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

  847.                     return -1;

  848.                 }

  849. 

  850.                 left = &s->intra4x4_pred_mode_cache[scan8[i] - 1];

  851.                 top  = &s->intra4x4_pred_mode_cache[scan8[i] - 8];

  852. 

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

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

  855. 

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

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

  858.                     return -1;

  859.                 }

  860.             }

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

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

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

  864.         }

  865. 

  866.         AV_COPY32(i4x4, i4x4_cache + 4 + 8 * 4);

  867.         i4x4[4] = i4x4_cache[7 + 8 * 3];

  868.         i4x4[5] = i4x4_cache[7 + 8 * 2];

  869.         i4x4[6] = i4x4_cache[7 + 8 * 1];

  870. 

  871.         if (mb_type == 8) {

  872.             ff_h264_check_intra4x4_pred_mode(s->intra4x4_pred_mode_cache,

  873.                                              s->avctx, s->top_samples_available,

  874.                                              s->left_samples_available);

  875. 

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

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

  878.         } else {

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

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

  881. 

  882.             s->top_samples_available  = 0x33FF;

  883.             s->left_samples_available = 0x5F5F;

  884.         }

  885. 

  886.         mb_type = MB_TYPE_INTRA4x4;

  887.     } else {                      /* INTRA16x16 */

  888.         dir = ff_h264_i_mb_type_info[mb_type - 8].pred_mode;

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

  890. 

  891.         if ((s->intra16x16_pred_mode = ff_h264_check_intra_pred_mode(s->avctx, s->top_samples_available,

  892.                                                                      s->left_samples_available, dir, 0)) < 0) {

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

  894.             return s->intra16x16_pred_mode;

  895.         }

  896. 

  897.         cbp     = ff_h264_i_mb_type_info[mb_type - 8].cbp;

  898.         mb_type = MB_TYPE_INTRA16x16;

  899.     }

  900. 

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

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

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

  904.                    0, 4 * 2 * sizeof(int16_t));

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

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

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

  908.                        0, 4 * 2 * sizeof(int16_t));

  909.         }

  910.     }

  911.     if (!IS_INTRA4x4(mb_type)) {

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

  913.     }

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

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

  916.     }

  917. 

  918.     if (!IS_INTRA16x16(mb_type) &&

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

  920.         if ((vlc = svq3_get_ue_golomb(&s->gb_slice)) >= 48) {

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

  922.             return -1;

  923.         }

  924. 

  925.         cbp = IS_INTRA(mb_type) ? ff_h264_golomb_to_intra4x4_cbp[vlc]

  926.                                 : ff_h264_golomb_to_inter_cbp[vlc];

  927.     }

  928.     if (IS_INTRA16x16(mb_type) ||

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

  930.         s->qscale += svq3_get_se_golomb(&s->gb_slice);

  931. 

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

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

  934.             return -1;

  935.         }

  936.     }

  937.     if (IS_INTRA16x16(mb_type)) {

  938.         AV_ZERO128(s->mb_luma_dc[0] + 0);

  939.         AV_ZERO128(s->mb_luma_dc[0] + 8);

  940.         if (svq3_decode_block(&s->gb_slice, s->mb_luma_dc[0], 0, 1)) {

  941.             av_log(s->avctx, AV_LOG_ERROR,

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

  943.             return -1;

  944.         }

  945.     }

  946. 

  947.     if (cbp) {

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

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

  950. 

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

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

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

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

  955.                                  2 * (j & 2) + 4 * (i & 2))

  956.                               : (4 * i + j);

  957.                     s->non_zero_count_cache[scan8[k]] = 1;

  958. 

  959.                     if (svq3_decode_block(&s->gb_slice, &s->mb[16 * k], index, type)) {

  960.                         av_log(s->avctx, AV_LOG_ERROR,

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

  962.                         return -1;

  963.                     }

  964.                 }

  965.             }

  966. 

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

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

  969.                 if (svq3_decode_block(&s->gb_slice, &s->mb[16 * 16 * i], 0, 3)) {

  970.                     av_log(s->avctx, AV_LOG_ERROR,

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

  972.                     return -1;

  973.                 }

  974. 

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

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

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

  978.                         k                                 = 16 * i + j;

  979.                         s->non_zero_count_cache[scan8[k]] = 1;

  980. 

  981.                         if (svq3_decode_block(&s->gb_slice, &s->mb[16 * k], 1, 1)) {

  982.                             av_log(s->avctx, AV_LOG_ERROR,

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

  984.                             return -1;

  985.                         }

  986.                     }

  987.                 }

  988.             }

  989.         }

  990.     }

  991. 

  992.     s->cbp                     = cbp;

  993.     s->cur_pic->mb_type[mb_xy] = mb_type;

  994. 

  995.     if (IS_INTRA(mb_type))

  996.         s->chroma_pred_mode = ff_h264_check_intra_pred_mode(s->avctx, s->top_samples_available,

  997.                                                             s->left_samples_available, DC_PRED8x8, 1);

  998. 

  999.     return 0;

  1000. }

  1001. 

  1002. static int svq3_decode_slice_header(AVCodecContext *avctx)

  1003. {

  1004.     SVQ3Context *s = avctx->priv_data;

  1005.     const int mb_xy   = s->mb_xy;

  1006.     int i, header;

  1007.     unsigned slice_id;

  1008. 

  1009.     header = get_bits(&s->gb, 8);

  1010. 

  1011.     if (((header & 0x9F) != 1 && (header & 0x9F) != 2) || (header & 0x60) == 0) {

  1012.         /* TODO: what? */

  1013.         av_log(avctx, AV_LOG_ERROR, "unsupported slice header (%02X)\n", header);

  1014.         return -1;

  1015.     } else {

  1016.         int slice_bits, slice_bytes, slice_length;

  1017.         int length = header >> 5 & 3;

  1018. 

  1019.         slice_length = show_bits(&s->gb, 8 * length);

  1020.         slice_bits   = slice_length * 8;

  1021.         slice_bytes  = slice_length + length - 1;

  1022. 

  1023.         if (slice_bytes > get_bits_left(&s->gb)) {

  1024.             av_log(avctx, AV_LOG_ERROR, "slice after bitstream end\n");

  1025.             return -1;

  1026.         }

  1027. 

  1028.         skip_bits(&s->gb, 8);

  1029. 

  1030.         av_fast_malloc(&s->slice_buf, &s->slice_size, slice_bytes + AV_INPUT_BUFFER_PADDING_SIZE);

  1031.         if (!s->slice_buf)

  1032.             return AVERROR(ENOMEM);

  1033. 

  1034.         memcpy(s->slice_buf, s->gb.buffer + s->gb.index / 8, slice_bytes);

  1035. 

  1036.         init_get_bits(&s->gb_slice, s->slice_buf, slice_bits);

  1037. 

  1038.         if (s->watermark_key) {

  1039.             uint32_t header = AV_RL32(&s->gb_slice.buffer[1]);

  1040.             AV_WL32(&s->gb_slice.buffer[1], header ^ s->watermark_key);

  1041.         }

  1042.         if (length > 0) {

  1043.             memcpy(s->slice_buf, &s->slice_buf[slice_length], length - 1);

  1044.         }

  1045.         skip_bits_long(&s->gb, slice_bytes * 8);

  1046.     }

  1047. 

  1048.     if ((slice_id = svq3_get_ue_golomb(&s->gb_slice)) >= 3) {

  1049.         av_log(s->avctx, AV_LOG_ERROR, "illegal slice type %u \n", slice_id);

  1050.         return -1;

  1051.     }

  1052. 

  1053.     s->pict_type = ff_h264_golomb_to_pict_type[slice_id];

  1054. 

  1055.     if ((header & 0x9F) == 2) {

  1056.         i = (s->mb_num < 64) ? 6 : (1 + av_log2(s->mb_num - 1));

  1057.         get_bits(&s->gb_slice, i);

  1058.     } else {

  1059.         skip_bits1(&s->gb_slice);

  1060.     }

  1061. 

  1062.     s->slice_num      = get_bits(&s->gb_slice, 8);

  1063.     s->qscale         = get_bits(&s->gb_slice, 5);

  1064.     s->adaptive_quant = get_bits1(&s->gb_slice);

  1065. 

  1066.     /* unknown fields */

  1067.     skip_bits1(&s->gb_slice);

  1068. 

  1069.     if (s->unknown_flag)

  1070.         skip_bits1(&s->gb_slice);

  1071. 

  1072.     skip_bits1(&s->gb_slice);

  1073.     skip_bits(&s->gb_slice, 2);

  1074. 

  1075.     while (get_bits1(&s->gb_slice))

  1076.         skip_bits(&s->gb_slice, 8);

  1077. 

  1078.     /* reset intra predictors and invalidate motion vector references */

  1079.     if (s->mb_x > 0) {

  1080.         memset(s->intra4x4_pred_mode + s->mb2br_xy[mb_xy - 1] + 3,

  1081.                -1, 4 * sizeof(int8_t));

  1082.         memset(s->intra4x4_pred_mode + s->mb2br_xy[mb_xy - s->mb_x],

  1083.                -1, 8 * sizeof(int8_t) * s->mb_x);

  1084.     }

  1085.     if (s->mb_y > 0) {

  1086.         memset(s->intra4x4_pred_mode + s->mb2br_xy[mb_xy - s->mb_stride],

  1087.                -1, 8 * sizeof(int8_t) * (s->mb_width - s->mb_x));

  1088. 

  1089.         if (s->mb_x > 0)

  1090.             s->intra4x4_pred_mode[s->mb2br_xy[mb_xy - s->mb_stride - 1] + 3] = -1;

  1091.     }

  1092. 

  1093.     return 0;

  1094. }

  1095. 

  1096. static void init_dequant4_coeff_table(SVQ3Context *s)

  1097. {

  1098.     int q, x;

  1099.     const int max_qp = 51;

  1100. 

  1101.     for (q = 0; q < max_qp + 1; q++) {

  1102.         int shift = ff_h264_quant_div6[q] + 2;

  1103.         int idx   = ff_h264_quant_rem6[q];

  1104.         for (x = 0; x < 16; x++)

  1105.             s->dequant4_coeff[q][(x >> 2) | ((x << 2) & 0xF)] =

  1106.                 ((uint32_t)ff_h264_dequant4_coeff_init[idx][(x & 1) + ((x >> 2) & 1)] * 16) << shift;

  1107.     }

  1108. }

  1109. 

  1110. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  1111. {

  1112.     SVQ3Context *s = avctx->priv_data;

  1113.     int m, x, y;

  1114.     unsigned char *extradata;

  1115.     unsigned char *extradata_end;

  1116.     unsigned int size;

  1117.     int marker_found = 0;

  1118. 

  1119.     s->cur_pic  = av_mallocz(sizeof(*s->cur_pic));

  1120.     s->last_pic = av_mallocz(sizeof(*s->last_pic));

  1121.     s->next_pic = av_mallocz(sizeof(*s->next_pic));

  1122.     if (!s->next_pic || !s->last_pic || !s->cur_pic) {

  1123.         av_freep(&s->cur_pic);

  1124.         av_freep(&s->last_pic);

  1125.         av_freep(&s->next_pic);

  1126.         return AVERROR(ENOMEM);

  1127.     }

  1128. 

  1129.     s->cur_pic->f  = av_frame_alloc();

  1130.     s->last_pic->f = av_frame_alloc();

  1131.     s->next_pic->f = av_frame_alloc();

  1132.     if (!s->cur_pic->f || !s->last_pic->f || !s->next_pic->f)

  1133.         return AVERROR(ENOMEM);

  1134. 

  1135.     ff_h264dsp_init(&s->h264dsp, 8, 1);

  1136.     ff_h264_pred_init(&s->hpc, AV_CODEC_ID_SVQ3, 8, 1);

  1137.     ff_videodsp_init(&s->vdsp, 8);

  1138. 

  1139.     ff_hpeldsp_init(&s->hdsp, avctx->flags);

  1140.     ff_tpeldsp_init(&s->tdsp);

  1141. 

  1142.     avctx->pix_fmt     = AV_PIX_FMT_YUVJ420P;

  1143.     avctx->color_range = AVCOL_RANGE_JPEG;

  1144. 

  1145.     s->avctx         = avctx;

  1146.     s->halfpel_flag  = 1;

  1147.     s->thirdpel_flag = 1;

  1148.     s->unknown_flag  = 0;

  1149. 

  1150.     /* prowl for the "SEQH" marker in the extradata */

  1151.     extradata     = (unsigned char *)avctx->extradata;

  1152.     extradata_end = avctx->extradata + avctx->extradata_size;

  1153.     if (extradata) {

  1154.         for (m = 0; m + 8 < avctx->extradata_size; m++) {

  1155.             if (!memcmp(extradata, "SEQH", 4)) {

  1156.                 marker_found = 1;

  1157.                 break;

  1158.             }

  1159.             extradata++;

  1160.         }

  1161.     }

  1162. 

  1163.     /* if a match was found, parse the extra data */

  1164.     if (marker_found) {

  1165.         GetBitContext gb;

  1166.         int frame_size_code;

  1167. 

  1168.         size = AV_RB32(&extradata[4]);

  1169.         if (size > extradata_end - extradata - 8)

  1170.             return AVERROR_INVALIDDATA;

  1171.         init_get_bits(&gb, extradata + 8, size * 8);

  1172. 

  1173.         /* 'frame size code' and optional 'width, height' */

  1174.         frame_size_code = get_bits(&gb, 3);

  1175.         switch (frame_size_code) {

  1176.         case 0:

  1177.             avctx->width  = 160;

  1178.             avctx->height = 120;

  1179.             break;

  1180.         case 1:

  1181.             avctx->width  = 128;

  1182.             avctx->height =  96;

  1183.             break;

  1184.         case 2:

  1185.             avctx->width  = 176;

  1186.             avctx->height = 144;

  1187.             break;

  1188.         case 3:

  1189.             avctx->width  = 352;

  1190.             avctx->height = 288;

  1191.             break;

  1192.         case 4:

  1193.             avctx->width  = 704;

  1194.             avctx->height = 576;

  1195.             break;

  1196.         case 5:

  1197.             avctx->width  = 240;

  1198.             avctx->height = 180;

  1199.             break;

  1200.         case 6:

  1201.             avctx->width  = 320;

  1202.             avctx->height = 240;

  1203.             break;

  1204.         case 7:

  1205.             avctx->width  = get_bits(&gb, 12);

  1206.             avctx->height = get_bits(&gb, 12);

  1207.             break;

  1208.         }

  1209. 

  1210.         s->halfpel_flag  = get_bits1(&gb);

  1211.         s->thirdpel_flag = get_bits1(&gb);

  1212. 

  1213.         /* unknown fields */

  1214.         skip_bits1(&gb);

  1215.         skip_bits1(&gb);

  1216.         skip_bits1(&gb);

  1217.         skip_bits1(&gb);

  1218. 

  1219.         s->low_delay = get_bits1(&gb);

  1220. 

  1221.         /* unknown field */

  1222.         skip_bits1(&gb);

  1223. 

  1224.         while (get_bits1(&gb))

  1225.             skip_bits(&gb, 8);

  1226. 

  1227.         s->unknown_flag  = get_bits1(&gb);

  1228.         avctx->has_b_frames = !s->low_delay;

  1229.         if (s->unknown_flag) {

  1230. #if CONFIG_ZLIB

  1231.             unsigned watermark_width  = svq3_get_ue_golomb(&gb);

  1232.             unsigned watermark_height = svq3_get_ue_golomb(&gb);

  1233.             int u1                    = svq3_get_ue_golomb(&gb);

  1234.             int u2                    = get_bits(&gb, 8);

  1235.             int u3                    = get_bits(&gb, 2);

  1236.             int u4                    = svq3_get_ue_golomb(&gb);

  1237.             unsigned long buf_len     = watermark_width *

  1238.                                         watermark_height * 4;

  1239.             int offset                = get_bits_count(&gb) + 7 >> 3;

  1240.             uint8_t *buf;

  1241. 

  1242.             if (watermark_height > 0 &&

  1243.                 (uint64_t)watermark_width * 4 > UINT_MAX / watermark_height)

  1244.                 return -1;

  1245. 

  1246.             buf = av_malloc(buf_len);

  1247.             av_log(avctx, AV_LOG_DEBUG, "watermark size: %ux%u\n",

  1248.                    watermark_width, watermark_height);

  1249.             av_log(avctx, AV_LOG_DEBUG,

  1250.                    "u1: %x u2: %x u3: %x compressed data size: %d offset: %d\n",

  1251.                    u1, u2, u3, u4, offset);

  1252.             if (uncompress(buf, &buf_len, extradata + 8 + offset,

  1253.                            size - offset) != Z_OK) {

  1254.                 av_log(avctx, AV_LOG_ERROR,

  1255.                        "could not uncompress watermark logo\n");

  1256.                 av_free(buf);

  1257.                 return -1;

  1258.             }

  1259.             s->watermark_key = ff_svq1_packet_checksum(buf, buf_len, 0);

  1260.             s->watermark_key = s->watermark_key << 16 | s->watermark_key;

  1261.             av_log(avctx, AV_LOG_DEBUG,

  1262.                    "watermark key %#"PRIx32"\n", s->watermark_key);

  1263.             av_free(buf);

  1264. #else

  1265.             av_log(avctx, AV_LOG_ERROR,

  1266.                    "this svq3 file contains watermark which need zlib support compiled in\n");

  1267.             return -1;

  1268. #endif

  1269.         }

  1270.     }

  1271. 

  1272.     s->mb_width   = (avctx->width + 15) / 16;

  1273.     s->mb_height  = (avctx->height + 15) / 16;

  1274.     s->mb_stride  = s->mb_width + 1;

  1275.     s->mb_num     = s->mb_width * s->mb_height;

  1276.     s->b_stride   = 4 * s->mb_width;

  1277.     s->h_edge_pos = s->mb_width * 16;

  1278.     s->v_edge_pos = s->mb_height * 16;

  1279. 

  1280.     s->intra4x4_pred_mode = av_mallocz(s->mb_stride * 2 * 8);

  1281.     if (!s->intra4x4_pred_mode)

  1282.         return AVERROR(ENOMEM);

  1283. 

  1284.     s->mb2br_xy = av_mallocz(s->mb_stride * (s->mb_height + 1) *

  1285.                              sizeof(*s->mb2br_xy));

  1286.     if (!s->mb2br_xy)

  1287.         return AVERROR(ENOMEM);

  1288. 

  1289.     for (y = 0; y < s->mb_height; y++)

  1290.         for (x = 0; x < s->mb_width; x++) {

  1291.             const int mb_xy = x + y * s->mb_stride;

  1292. 

  1293.             s->mb2br_xy[mb_xy] = 8 * (mb_xy % (2 * s->mb_stride));

  1294.         }

  1295. 

  1296.     init_dequant4_coeff_table(s);

  1297. 

  1298.     return 0;

  1299. }

  1300. 

  1301. static void free_picture(AVCodecContext *avctx, H264Picture *pic)

  1302. {

  1303.     int i;

  1304.     for (i = 0; i < 2; i++) {

  1305.         av_buffer_unref(&pic->motion_val_buf[i]);

  1306.         av_buffer_unref(&pic->ref_index_buf[i]);

  1307.     }

  1308.     av_buffer_unref(&pic->mb_type_buf);

  1309. 

  1310.     av_frame_unref(pic->f);

  1311. }

  1312. 

  1313. static int get_buffer(AVCodecContext *avctx, H264Picture *pic)

  1314. {

  1315.     SVQ3Context *s = avctx->priv_data;

  1316.     const int big_mb_num    = s->mb_stride * (s->mb_height + 1) + 1;

  1317.     const int mb_array_size = s->mb_stride * s->mb_height;

  1318.     const int b4_stride     = s->mb_width * 4 + 1;

  1319.     const int b4_array_size = b4_stride * s->mb_height * 4;

  1320.     int ret;

  1321. 

  1322.     if (!pic->motion_val_buf[0]) {

  1323.         int i;

  1324. 

  1325.         pic->mb_type_buf = av_buffer_allocz((big_mb_num + s->mb_stride) * sizeof(uint32_t));

  1326.         if (!pic->mb_type_buf)

  1327.             return AVERROR(ENOMEM);

  1328.         pic->mb_type = (uint32_t*)pic->mb_type_buf->data + 2 * s->mb_stride + 1;

  1329. 

  1330.         for (i = 0; i < 2; i++) {

  1331.             pic->motion_val_buf[i] = av_buffer_allocz(2 * (b4_array_size + 4) * sizeof(int16_t));

  1332.             pic->ref_index_buf[i]  = av_buffer_allocz(4 * mb_array_size);

  1333.             if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i]) {

  1334.                 ret = AVERROR(ENOMEM);

  1335.                 goto fail;

  1336.             }

  1337. 

  1338.             pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;

  1339.             pic->ref_index[i]  = pic->ref_index_buf[i]->data;

  1340.         }

  1341.     }

  1342.     pic->reference = !(s->pict_type == AV_PICTURE_TYPE_B);

  1343. 

  1344.     ret = ff_get_buffer(avctx, pic->f,

  1345.                         pic->reference ? AV_GET_BUFFER_FLAG_REF : 0);

  1346.     if (ret < 0)

  1347.         goto fail;

  1348. 

  1349.     if (!s->edge_emu_buffer) {

  1350.         s->edge_emu_buffer = av_mallocz(pic->f->linesize[0] * 17);

  1351.         if (!s->edge_emu_buffer)

  1352.             return AVERROR(ENOMEM);

  1353.     }

  1354. 

  1355.     return 0;

  1356. fail:

  1357.     free_picture(avctx, pic);

  1358.     return ret;

  1359. }

  1360. 

  1361. static int svq3_decode_frame(AVCodecContext *avctx, void *data,

  1362.                              int *got_frame, AVPacket *avpkt)

  1363. {

  1364.     const uint8_t *buf = avpkt->data;

  1365.     SVQ3Context *s     = avctx->priv_data;

  1366.     int buf_size       = avpkt->size;

  1367.     int ret, m, i;

  1368. 

  1369.     /* special case for last picture */

  1370.     if (buf_size == 0) {

  1371.         if (s->next_pic->f->data[0] && !s->low_delay && !s->last_frame_output) {

  1372.             ret = av_frame_ref(data, s->next_pic->f);

  1373.             if (ret < 0)

  1374.                 return ret;

  1375.             s->last_frame_output = 1;

  1376.             *got_frame          = 1;

  1377.         }

  1378.         return 0;

  1379.     }

  1380. 

  1381.     ret = init_get_bits(&s->gb, buf, 8 * buf_size);

  1382.     if (ret < 0)

  1383.         return ret;

  1384. 

  1385.     s->mb_x = s->mb_y = s->mb_xy = 0;

  1386. 

  1387.     if (svq3_decode_slice_header(avctx))

  1388.         return -1;

  1389. 

  1390.     if (s->pict_type != AV_PICTURE_TYPE_B)

  1391.         FFSWAP(H264Picture*, s->next_pic, s->last_pic);

  1392. 

  1393.     av_frame_unref(s->cur_pic->f);

  1394. 

  1395.     /* for skipping the frame */

  1396.     s->cur_pic->f->pict_type = s->pict_type;

  1397.     s->cur_pic->f->key_frame = (s->pict_type == AV_PICTURE_TYPE_I);

  1398. 

  1399.     ret = get_buffer(avctx, s->cur_pic);

  1400.     if (ret < 0)

  1401.         return ret;

  1402. 

  1403.     for (i = 0; i < 16; i++) {

  1404.         s->block_offset[i]           = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * s->cur_pic->f->linesize[0] * ((scan8[i] - scan8[0]) >> 3);

  1405.         s->block_offset[48 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * s->cur_pic->f->linesize[0] * ((scan8[i] - scan8[0]) >> 3);

  1406.     }

  1407.     for (i = 0; i < 16; i++) {

  1408.         s->block_offset[16 + i]      =

  1409.         s->block_offset[32 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * s->cur_pic->f->linesize[1] * ((scan8[i] - scan8[0]) >> 3);

  1410.         s->block_offset[48 + 16 + i] =

  1411.         s->block_offset[48 + 32 + i] = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * s->cur_pic->f->linesize[1] * ((scan8[i] - scan8[0]) >> 3);

  1412.     }

  1413. 

  1414.     if (s->pict_type != AV_PICTURE_TYPE_I) {

  1415.         if (!s->last_pic->f->data[0]) {

  1416.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1417.             ret = get_buffer(avctx, s->last_pic);

  1418.             if (ret < 0)

  1419.                 return ret;

  1420.             memset(s->last_pic->f->data[0], 0, avctx->height * s->last_pic->f->linesize[0]);

  1421.             memset(s->last_pic->f->data[1], 0x80, (avctx->height / 2) *

  1422.                    s->last_pic->f->linesize[1]);

  1423.             memset(s->last_pic->f->data[2], 0x80, (avctx->height / 2) *

  1424.                    s->last_pic->f->linesize[2]);

  1425.         }

  1426. 

  1427.         if (s->pict_type == AV_PICTURE_TYPE_B && !s->next_pic->f->data[0]) {

  1428.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1429.             ret = get_buffer(avctx, s->next_pic);

  1430.             if (ret < 0)

  1431.                 return ret;

  1432.             memset(s->next_pic->f->data[0], 0, avctx->height * s->next_pic->f->linesize[0]);

  1433.             memset(s->next_pic->f->data[1], 0x80, (avctx->height / 2) *

  1434.                    s->next_pic->f->linesize[1]);

  1435.             memset(s->next_pic->f->data[2], 0x80, (avctx->height / 2) *

  1436.                    s->next_pic->f->linesize[2]);

  1437.         }

  1438.     }

  1439. 

  1440.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  1441.         av_log(s->avctx, AV_LOG_DEBUG,

  1442.                "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n",

  1443.                av_get_picture_type_char(s->pict_type),

  1444.                s->halfpel_flag, s->thirdpel_flag,

  1445.                s->adaptive_quant, s->qscale, s->slice_num);

  1446. 

  1447.     if (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B ||

  1448.         avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I ||

  1449.         avctx->skip_frame >= AVDISCARD_ALL)

  1450.         return 0;

  1451. 

  1452.     if (s->next_p_frame_damaged) {

  1453.         if (s->pict_type == AV_PICTURE_TYPE_B)

  1454.             return 0;

  1455.         else

  1456.             s->next_p_frame_damaged = 0;

  1457.     }

  1458. 

  1459.     if (s->pict_type == AV_PICTURE_TYPE_B) {

  1460.         s->frame_num_offset = s->slice_num - s->prev_frame_num;

  1461. 

  1462.         if (s->frame_num_offset < 0)

  1463.             s->frame_num_offset += 256;

  1464.         if (s->frame_num_offset == 0 ||

  1465.             s->frame_num_offset >= s->prev_frame_num_offset) {

  1466.             av_log(s->avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  1467.             return -1;

  1468.         }

  1469.     } else {

  1470.         s->prev_frame_num        = s->frame_num;

  1471.         s->frame_num             = s->slice_num;

  1472.         s->prev_frame_num_offset = s->frame_num - s->prev_frame_num;

  1473. 

  1474.         if (s->prev_frame_num_offset < 0)

  1475.             s->prev_frame_num_offset += 256;

  1476.     }

  1477. 

  1478.     for (m = 0; m < 2; m++) {

  1479.         int i;

  1480.         for (i = 0; i < 4; i++) {

  1481.             int j;

  1482.             for (j = -1; j < 4; j++)

  1483.                 s->ref_cache[m][scan8[0] + 8 * i + j] = 1;

  1484.             if (i < 3)

  1485.                 s->ref_cache[m][scan8[0] + 8 * i + j] = PART_NOT_AVAILABLE;

  1486.         }

  1487.     }

  1488. 

  1489.     for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  1490.         for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  1491.             unsigned mb_type;

  1492.             s->mb_xy = s->mb_x + s->mb_y * s->mb_stride;

  1493. 

  1494.             if ((get_bits_left(&s->gb_slice)) <= 7) {

  1495.                 if (((get_bits_count(&s->gb_slice) & 7) == 0 ||

  1496.                     show_bits(&s->gb_slice, get_bits_left(&s->gb_slice) & 7) == 0)) {

  1497. 

  1498.                     if (svq3_decode_slice_header(avctx))

  1499.                         return -1;

  1500.                 }

  1501.                 /* TODO: support s->mb_skip_run */

  1502.             }

  1503. 

  1504.             mb_type = svq3_get_ue_golomb(&s->gb_slice);

  1505. 

  1506.             if (s->pict_type == AV_PICTURE_TYPE_I)

  1507.                 mb_type += 8;

  1508.             else if (s->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4)

  1509.                 mb_type += 4;

  1510.             if (mb_type > 33 || svq3_decode_mb(s, mb_type)) {

  1511.                 av_log(s->avctx, AV_LOG_ERROR,

  1512.                        "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1513.                 return -1;

  1514.             }

  1515. 

  1516.             if (mb_type != 0)

  1517.                 hl_decode_mb(s);

  1518. 

  1519.             if (s->pict_type != AV_PICTURE_TYPE_B && !s->low_delay)

  1520.                 s->cur_pic->mb_type[s->mb_x + s->mb_y * s->mb_stride] =

  1521.                     (s->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1522.         }

  1523. 

  1524.         ff_draw_horiz_band(avctx, s->cur_pic->f,

  1525.                            s->last_pic->f->data[0] ? s->last_pic->f : NULL,

  1526.                            16 * s->mb_y, 16, PICT_FRAME, 0,

  1527.                            s->low_delay);

  1528.     }

  1529. 

  1530.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay)

  1531.         ret = av_frame_ref(data, s->cur_pic->f);

  1532.     else if (s->last_pic->f->data[0])

  1533.         ret = av_frame_ref(data, s->last_pic->f);

  1534.     if (ret < 0)

  1535.         return ret;

  1536. 

  1537.     /* Do not output the last pic after seeking. */

  1538.     if (s->last_pic->f->data[0] || s->low_delay)

  1539.         *got_frame = 1;

  1540. 

  1541.     if (s->pict_type != AV_PICTURE_TYPE_B) {

  1542.         FFSWAP(H264Picture*, s->cur_pic, s->next_pic);

  1543.     } else {

  1544.         av_frame_unref(s->cur_pic->f);

  1545.     }

  1546. 

  1547.     return buf_size;

  1548. }

  1549. 

  1550. static av_cold int svq3_decode_end(AVCodecContext *avctx)

  1551. {

  1552.     SVQ3Context *s = avctx->priv_data;

  1553. 

  1554.     free_picture(avctx, s->cur_pic);

  1555.     free_picture(avctx, s->next_pic);

  1556.     free_picture(avctx, s->last_pic);

  1557.     av_frame_free(&s->cur_pic->f);

  1558.     av_frame_free(&s->next_pic->f);

  1559.     av_frame_free(&s->last_pic->f);

  1560.     av_freep(&s->cur_pic);

  1561.     av_freep(&s->next_pic);

  1562.     av_freep(&s->last_pic);

  1563.     av_freep(&s->slice_buf);

  1564.     av_freep(&s->intra4x4_pred_mode);

  1565.     av_freep(&s->edge_emu_buffer);

  1566.     av_freep(&s->mb2br_xy);

  1567. 

  1568.     return 0;

  1569. }

  1570. 

  1571. AVCodec ff_svq3_decoder = {

  1572.     .name           = "svq3",

  1573.     .long_name      = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1574.     .type           = AVMEDIA_TYPE_VIDEO,

  1575.     .id             = AV_CODEC_ID_SVQ3,

  1576.     .priv_data_size = sizeof(SVQ3Context),

  1577.     .init           = svq3_decode_init,

  1578.     .close          = svq3_decode_end,

  1579.     .decode         = svq3_decode_frame,

  1580.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND |

  1581.                       AV_CODEC_CAP_DR1             |

  1582.                       AV_CODEC_CAP_DELAY,

  1583.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P,

  1584.                                                      AV_PIX_FMT_NONE},

  1585. };