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FFmpeg/libavcodec/svq3.c

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  1. /*

  2.  * Copyright (c) 2003 The Libav Project

  3.  *

  4.  * This file is part of Libav.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. /*

  22.  * How to use this decoder:

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

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

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

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

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

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

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

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

  31.  *

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

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

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

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

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

  37.  *

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

  39.  * correctly decodes this file:

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

  41.  */

  42. 

  43. #include <inttypes.h>

  44. 

  45. #include "libavutil/attributes.h"

  46. #include "internal.h"

  47. #include "avcodec.h"

  48. #include "mpegutils.h"

  49. #include "h264dec.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 SVQ3Frame {

  69.     AVFrame *f;

  70. 

  71.     AVBufferRef *motion_val_buf[2];

  72.     int16_t (*motion_val[2])[2];

  73. 

  74.     AVBufferRef *mb_type_buf;

  75.     uint32_t *mb_type;

  76. 

  77. 

  78.     AVBufferRef *ref_index_buf[2];

  79.     int8_t *ref_index[2];

  80. } SVQ3Frame;

  81. 

  82. typedef struct SVQ3Context {

  83.     AVCodecContext *avctx;

  84. 

  85.     H264DSPContext  h264dsp;

  86.     H264PredContext hpc;

  87.     HpelDSPContext hdsp;

  88.     TpelDSPContext tdsp;

  89.     VideoDSPContext vdsp;

  90. 

  91.     SVQ3Frame *cur_pic;

  92.     SVQ3Frame *next_pic;

  93.     SVQ3Frame *last_pic;

  94.     GetBitContext gb;

  95.     GetBitContext gb_slice;

  96.     uint8_t *slice_buf;

  97.     int slice_size;

  98.     int halfpel_flag;

  99.     int thirdpel_flag;

  100.     int unknown_flag;

  101.     uint32_t watermark_key;

  102.     int adaptive_quant;

  103.     int next_p_frame_damaged;

  104.     int h_edge_pos;

  105.     int v_edge_pos;

  106.     int last_frame_output;

  107.     int slice_num;

  108.     int qscale;

  109.     int cbp;

  110.     int frame_num;

  111.     int frame_num_offset;

  112.     int prev_frame_num_offset;

  113.     int prev_frame_num;

  114. 

  115.     enum AVPictureType pict_type;

  116.     int low_delay;

  117. 

  118.     int mb_x, mb_y;

  119.     int mb_xy;

  120.     int mb_width, mb_height;

  121.     int mb_stride, mb_num;

  122.     int b_stride;

  123. 

  124.     uint32_t *mb2br_xy;

  125. 

  126.     int chroma_pred_mode;

  127.     int intra16x16_pred_mode;

  128. 

  129.     int8_t   intra4x4_pred_mode_cache[5 * 8];

  130.     int8_t (*intra4x4_pred_mode);

  131. 

  132.     unsigned int top_samples_available;

  133.     unsigned int topright_samples_available;

  134.     unsigned int left_samples_available;

  135. 

  136.     uint8_t *edge_emu_buffer;

  137. 

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

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

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

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

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

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

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

  145. } SVQ3Context;

  146. 

  147. #define FULLPEL_MODE  1

  148. #define HALFPEL_MODE  2

  149. #define THIRDPEL_MODE 3

  150. #define PREDICT_MODE  4

  151. 

  152. /* dual scan (from some older H.264 draft)

  153.  * o-->o-->o   o

  154.  *         |  /|

  155.  * o   o   o / o

  156.  * | / |   |/  |

  157.  * o   o   o   o

  158.  *   /

  159.  * o-->o-->o-->o

  160.  */

  161. static const uint8_t svq3_scan[16] = {

  162.     0 + 0 * 4, 1 + 0 * 4, 2 + 0 * 4, 2 + 1 * 4,

  163.     2 + 2 * 4, 3 + 0 * 4, 3 + 1 * 4, 3 + 2 * 4,

  164.     0 + 1 * 4, 0 + 2 * 4, 1 + 1 * 4, 1 + 2 * 4,

  165.     0 + 3 * 4, 1 + 3 * 4, 2 + 3 * 4, 3 + 3 * 4,

  166. };

  167. 

  168. static const uint8_t luma_dc_zigzag_scan[16] = {

  169.     0 * 16 + 0 * 64, 1 * 16 + 0 * 64, 2 * 16 + 0 * 64, 0 * 16 + 2 * 64,

  170.     3 * 16 + 0 * 64, 0 * 16 + 1 * 64, 1 * 16 + 1 * 64, 2 * 16 + 1 * 64,

  171.     1 * 16 + 2 * 64, 2 * 16 + 2 * 64, 3 * 16 + 2 * 64, 0 * 16 + 3 * 64,

  172.     3 * 16 + 1 * 64, 1 * 16 + 3 * 64, 2 * 16 + 3 * 64, 3 * 16 + 3 * 64,

  173. };

  174. 

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

  176.     { 0, 0 },

  177.     { 1, 0 }, { 0, 1 },

  178.     { 0, 2 }, { 1, 1 }, { 2, 0 },

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

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

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

  182.     { 2, 4 }, { 3, 3 }, { 4, 2 },

  183.     { 4, 3 }, { 3, 4 },

  184.     { 4, 4 }

  185. };

  186. 

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

  188.     { { 2, -1, -1, -1, -1 }, { 2, 1, -1, -1, -1 }, { 1, 2, -1, -1, -1 },

  189.       { 2,  1, -1, -1, -1 }, { 1, 2, -1, -1, -1 }, { 1, 2, -1, -1, -1 } },

  190.     { { 0,  2, -1, -1, -1 }, { 0, 2,  1,  4,  3 }, { 0, 1,  2,  4,  3 },

  191.       { 0,  2,  1,  4,  3 }, { 2, 0,  1,  3,  4 }, { 0, 4,  2,  1,  3 } },

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

  193.       { 2,  1,  0,  4,  3 }, { 2, 1,  4,  3,  0 }, { 1, 2,  4,  0,  3 } },

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

  195.       { 2,  1,  0,  4,  3 }, { 2, 1,  3,  4,  0 }, { 2, 4,  1,  0,  3 } },

  196.     { { 0,  2, -1, -1, -1 }, { 0, 2,  1,  3,  4 }, { 1, 2,  3,  0,  4 },

  197.       { 2,  0,  1,  3,  4 }, { 2, 1,  3,  0,  4 }, { 2, 0,  4,  3,  1 } },

  198.     { { 0,  2, -1, -1, -1 }, { 0, 2,  4,  1,  3 }, { 1, 4,  2,  0,  3 },

  199.       { 4,  2,  0,  1,  3 }, { 2, 0,  1,  4,  3 }, { 4, 2,  1,  0,  3 } },

  200. };

  201. 

  202. static const struct {

  203.     uint8_t run;

  204.     uint8_t level;

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

  206.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  207.       { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  208.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  209.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  210. };

  211. 

  212. static const uint32_t svq3_dequant_coeff[32] = {

  213.      3881,  4351,  4890,  5481,   6154,   6914,   7761,   8718,

  214.      9781, 10987, 12339, 13828,  15523,  17435,  19561,  21873,

  215.     24552, 27656, 30847, 34870,  38807,  43747,  49103,  54683,

  216.     61694, 68745, 77615, 89113, 100253, 109366, 126635, 141533

  217. };

  218. 

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

  220. {

  221.     const int qmul = svq3_dequant_coeff[qp];

  222. #define stride 16

  223.     int i;

  224.     int temp[16];

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

  226. 

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

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

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

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

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

  232. 

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

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

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

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

  237.     }

  238. 

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

  240.         const int offset = x_offset[i];

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

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

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

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

  245. 

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

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

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

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

  250.     }

  251. }

  252. #undef stride

  253. 

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

  255.                             int stride, int qp, int dc)

  256. {

  257.     const int qmul = svq3_dequant_coeff[qp];

  258.     int i;

  259. 

  260.     if (dc) {

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

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

  263.         block[0] = 0;

  264.     }

  265. 

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

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

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

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

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

  271. 

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

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

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

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

  276.     }

  277. 

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

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

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

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

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

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

  284. 

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

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

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

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

  289.     }

  290. 

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

  292. }

  293. 

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

  295.                                     int index, const int type)

  296. {

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

  298.         luma_dc_zigzag_scan, ff_zigzag_scan, svq3_scan, ff_h264_chroma_dc_scan

  299.     };

  300. 

  301.     int run, level, limit;

  302.     unsigned vlc;

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

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

  305. 

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

  307.         for (; (vlc = get_interleaved_ue_golomb(gb)) != 0; index++) {

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

  309.             vlc      = vlc + 1 >> 1;

  310. 

  311.             if (type == 3) {

  312.                 if (vlc < 3) {

  313.                     run   = 0;

  314.                     level = vlc;

  315.                 } else if (vlc < 4) {

  316.                     run   = 1;

  317.                     level = 1;

  318.                 } else {

  319.                     run   = vlc & 0x3;

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

  321.                 }

  322.             } else {

  323.                 if (vlc < 16) {

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

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

  326.                 } else if (intra) {

  327.                     run   = vlc & 0x7;

  328.                     level = (vlc >> 3) +

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

  330.                 } else {

  331.                     run   = vlc & 0xF;

  332.                     level = (vlc >> 4) +

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

  334.                 }

  335.             }

  336. 

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

  338.                 return -1;

  339. 

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

  341.         }

  342. 

  343.         if (type != 2) {

  344.             break;

  345.         }

  346.     }

  347. 

  348.     return 0;

  349. }

  350. 

  351. static av_always_inline int

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

  353.                        int i, int list, int part_width)

  354. {

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

  356. 

  357.     if (topright_ref != PART_NOT_AVAILABLE) {

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

  359.         return topright_ref;

  360.     } else {

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

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

  363.     }

  364. }

  365. 

  366. /**

  367.  * Get the predicted MV.

  368.  * @param n the block index

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

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

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

  372.  */

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

  374.                                               int part_width, int list,

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

  376. {

  377.     const int index8       = scan8[n];

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

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

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

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

  382.     const int16_t *C;

  383.     int diagonal_ref, match_count;

  384. 

  385. /* mv_cache

  386.  * B . . A T T T T

  387.  * U . . L . . , .

  388.  * U . . L . . . .

  389.  * U . . L . . , .

  390.  * . . . L . . . .

  391.  */

  392. 

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

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

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

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

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

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

  399.         if (left_ref == ref) {

  400.             *mx = A[0];

  401.             *my = A[1];

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

  403.             *mx = B[0];

  404.             *my = B[1];

  405.         } else {

  406.             *mx = C[0];

  407.             *my = C[1];

  408.         }

  409.     } else {

  410.         if (top_ref      == PART_NOT_AVAILABLE &&

  411.             diagonal_ref == PART_NOT_AVAILABLE &&

  412.             left_ref     != PART_NOT_AVAILABLE) {

  413.             *mx = A[0];

  414.             *my = A[1];

  415.         } else {

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

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

  418.         }

  419.     }

  420. }

  421. 

  422. static inline void svq3_mc_dir_part(SVQ3Context *s,

  423.                                     int x, int y, int width, int height,

  424.                                     int mx, int my, int dxy,

  425.                                     int thirdpel, int dir, int avg)

  426. {

  427.     const SVQ3Frame *pic = (dir == 0) ? s->last_pic : s->next_pic;

  428.     uint8_t *src, *dest;

  429.     int i, emu = 0;

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

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

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

  433. 

  434.     mx += x;

  435.     my += y;

  436. 

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

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

  439.         emu = 1;

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

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

  442.     }

  443. 

  444.     /* form component predictions */

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

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

  447. 

  448.     if (emu) {

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

  450.                                  linesize, linesize,

  451.                                  width + 1, height + 1,

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

  453.         src = s->edge_emu_buffer;

  454.     }

  455.     if (thirdpel)

  456.         (avg ? s->tdsp.avg_tpel_pixels_tab

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

  458.                                                  width, height);

  459.     else

  460.         (avg ? s->hdsp.avg_pixels_tab

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

  462.                                                        height);

  463. 

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

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

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

  467.         width  = width  >> 1;

  468.         height = height >> 1;

  469.         blocksize++;

  470. 

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

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

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

  474. 

  475.             if (emu) {

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

  477.                                          uvlinesize, uvlinesize,

  478.                                          width + 1, height + 1,

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

  480.                                          s->v_edge_pos >> 1);

  481.                 src = s->edge_emu_buffer;

  482.             }

  483.             if (thirdpel)

  484.                 (avg ? s->tdsp.avg_tpel_pixels_tab

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

  486.                                                          uvlinesize,

  487.                                                          width, height);

  488.             else

  489.                 (avg ? s->hdsp.avg_pixels_tab

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

  491.                                                                uvlinesize,

  492.                                                                height);

  493.         }

  494.     }

  495. }

  496. 

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

  498.                               int dir, int avg)

  499. {

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

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

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

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

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

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

  506. 

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

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

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

  510.                              (4 * s->mb_y + (i >> 2)) * s->b_stride;

  511.             int dxy;

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

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

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

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

  516. 

  517.             if (mode != PREDICT_MODE) {

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

  519.             } else {

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

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

  522. 

  523.                 if (dir == 0) {

  524.                     mx = mx * s->frame_num_offset /

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

  526.                     my = my * s->frame_num_offset /

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

  528.                 } else {

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

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

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

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

  533.                 }

  534.             }

  535. 

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

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

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

  539. 

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

  541.             if (mode == PREDICT_MODE) {

  542.                 dx = dy = 0;

  543.             } else {

  544.                 dy = get_interleaved_se_golomb(&s->gb_slice);

  545.                 dx = get_interleaved_se_golomb(&s->gb_slice);

  546. 

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

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

  549.                     return -1;

  550.                 }

  551.             }

  552. 

  553.             /* compute motion vector */

  554.             if (mode == THIRDPEL_MODE) {

  555.                 int fx, fy;

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

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

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

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

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

  561. 

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

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

  564.                 mx += mx;

  565.                 my += my;

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

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

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

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

  570. 

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

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

  573.                 mx *= 3;

  574.                 my *= 3;

  575.             } else {

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

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

  578. 

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

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

  581.                 mx *= 6;

  582.                 my *= 6;

  583.             }

  584. 

  585.             /* update mv_cache */

  586.             if (mode != PREDICT_MODE) {

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

  588. 

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

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

  591. 

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

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

  594.                 }

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

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

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

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

  599.             }

  600. 

  601.             /* write back motion vectors */

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

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

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

  605.         }

  606. 

  607.     return 0;

  608. }

  609. 

  610. static av_always_inline void hl_decode_mb_idct_luma(SVQ3Context *s,

  611.                                                     int mb_type, const int *block_offset,

  612.                                                     int linesize, uint8_t *dest_y)

  613. {

  614.     int i;

  615.     if (!IS_INTRA4x4(mb_type)) {

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

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

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

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

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

  621.             }

  622.     }

  623. }

  624. 

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

  626. {

  627.     return AV_RN16A(mb + index);

  628. }

  629. 

  630. static av_always_inline void hl_decode_mb_predict_luma(SVQ3Context *s,

  631.                                                        int mb_type,

  632.                                                        const int *block_offset,

  633.                                                        int linesize,

  634.                                                        uint8_t *dest_y)

  635. {

  636.     int i;

  637.     int qscale = s->qscale;

  638. 

  639.     if (IS_INTRA4x4(mb_type)) {

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

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

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

  643. 

  644.             uint8_t *topright;

  645.             int nnz, tr;

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

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

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

  649.                 if (!topright_avail) {

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

  651.                     topright = (uint8_t *)&tr;

  652.                 } else

  653.                     topright = ptr + 4 - linesize;

  654.             } else

  655.                 topright = NULL;

  656. 

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

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

  659.             if (nnz) {

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

  661.             }

  662.         }

  663.     } else {

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

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

  666.     }

  667. }

  668. 

  669. static void hl_decode_mb(SVQ3Context *s)

  670. {

  671.     const int mb_x    = s->mb_x;

  672.     const int mb_y    = s->mb_y;

  673.     const int mb_xy   = s->mb_xy;

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

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

  676.     int linesize, uvlinesize;

  677.     int i, j;

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

  679.     const int block_h   = 16 >> 1;

  680. 

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

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

  683. 

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

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

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

  687. 

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

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

  690. 

  691.     if (IS_INTRA(mb_type)) {

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

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

  694. 

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

  696.     }

  697. 

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

  699. 

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

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

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

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

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

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

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

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

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

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

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

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

  712.                 }

  713.         }

  714.     }

  715. }

  716. 

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

  718. {

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

  720.     int cbp = 0;

  721.     uint32_t vlc;

  722.     int8_t *top, *left;

  723.     const int mb_xy = s->mb_xy;

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

  725. 

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

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

  728.     s->topright_samples_available = 0xFFFF;

  729. 

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

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

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

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

  734.                              0, 0, 0, 0, 0, 0);

  735. 

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

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

  738.                                  0, 0, 0, 0, 1, 1);

  739. 

  740.             mb_type = MB_TYPE_SKIP;

  741.         } else {

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

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

  744.                 return -1;

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

  746.                 return -1;

  747. 

  748.             mb_type = MB_TYPE_16x16;

  749.         }

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

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

  752.             mode = THIRDPEL_MODE;

  753.         else if (s->halfpel_flag &&

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

  755.             mode = HALFPEL_MODE;

  756.         else

  757.             mode = FULLPEL_MODE;

  758. 

  759.         /* fill caches */

  760.         /* note ref_cache should contain here:

  761.          *  ????????

  762.          *  ???11111

  763.          *  N??11111

  764.          *  N??11111

  765.          *  N??11111

  766.          */

  767. 

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

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

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

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

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

  773.             } else {

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

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

  776.             }

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

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

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

  780.                        4 * 2 * sizeof(int16_t));

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

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

  783. 

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

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

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

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

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

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

  790.                 } else

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

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

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

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

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

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

  797.                 } else

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

  799.             } else

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

  801.                        PART_NOT_AVAILABLE, 8);

  802. 

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

  804.                 break;

  805.         }

  806. 

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

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

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

  810.                 return -1;

  811.         } else {        /* AV_PICTURE_TYPE_B */

  812.             if (mb_type != 2) {

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

  814.                     return -1;

  815.             } else {

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

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

  818.                            0, 4 * 2 * sizeof(int16_t));

  819.             }

  820.             if (mb_type != 1) {

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

  822.                     return -1;

  823.             } else {

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

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

  826.                            0, 4 * 2 * sizeof(int16_t));

  827.             }

  828.         }

  829. 

  830.         mb_type = MB_TYPE_16x16;

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

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

  833.         int8_t *i4x4_cache = s->intra4x4_pred_mode_cache;

  834. 

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

  836. 

  837.         if (mb_type == 8) {

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

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

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

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

  842.                     s->left_samples_available = 0x5F5F;

  843.             }

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

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

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

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

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

  849. 

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

  851.                     s->top_samples_available = 0x33FF;

  852.             }

  853. 

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

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

  856.                 vlc = get_interleaved_ue_golomb(&s->gb_slice);

  857. 

  858.                 if (vlc >= 25) {

  859.                     av_log(s->avctx, AV_LOG_ERROR,

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

  861.                     return -1;

  862.                 }

  863. 

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

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

  866. 

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

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

  869. 

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

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

  872.                     return -1;

  873.                 }

  874.             }

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

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

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

  878.         }

  879. 

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

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

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

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

  884. 

  885.         if (mb_type == 8) {

  886.             ff_h264_check_intra4x4_pred_mode(s->intra4x4_pred_mode_cache,

  887.                                              s->avctx, s->top_samples_available,

  888.                                              s->left_samples_available);

  889. 

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

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

  892.         } else {

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

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

  895. 

  896.             s->top_samples_available  = 0x33FF;

  897.             s->left_samples_available = 0x5F5F;

  898.         }

  899. 

  900.         mb_type = MB_TYPE_INTRA4x4;

  901.     } else {                      /* INTRA16x16 */

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

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

  904. 

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

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

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

  908.             return s->intra16x16_pred_mode;

  909.         }

  910. 

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

  912.         mb_type = MB_TYPE_INTRA16x16;

  913.     }

  914. 

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

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

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

  918.                    0, 4 * 2 * sizeof(int16_t));

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

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

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

  922.                        0, 4 * 2 * sizeof(int16_t));

  923.         }

  924.     }

  925.     if (!IS_INTRA4x4(mb_type)) {

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

  927.     }

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

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

  930.     }

  931. 

  932.     if (!IS_INTRA16x16(mb_type) &&

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

  934.         if ((vlc = get_interleaved_ue_golomb(&s->gb_slice)) >= 48) {

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

  936.             return -1;

  937.         }

  938. 

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

  940.                                 : ff_h264_golomb_to_inter_cbp[vlc];

  941.     }

  942.     if (IS_INTRA16x16(mb_type) ||

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

  944.         s->qscale += get_interleaved_se_golomb(&s->gb_slice);

  945. 

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

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

  948.             return -1;

  949.         }

  950.     }

  951.     if (IS_INTRA16x16(mb_type)) {

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

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

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

  955.             av_log(s->avctx, AV_LOG_ERROR,

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

  957.             return -1;

  958.         }

  959.     }

  960. 

  961.     if (cbp) {

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

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

  964. 

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

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

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

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

  969.                                  2 * (j & 2) + 4 * (i & 2))

  970.                               : (4 * i + j);

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

  972. 

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

  974.                         av_log(s->avctx, AV_LOG_ERROR,

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

  976.                         return -1;

  977.                     }

  978.                 }

  979.             }

  980. 

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

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

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

  984.                     av_log(s->avctx, AV_LOG_ERROR,

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

  986.                     return -1;

  987.                 }

  988. 

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

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

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

  992.                         k                                 = 16 * i + j;

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

  994. 

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

  996.                             av_log(s->avctx, AV_LOG_ERROR,

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

  998.                             return -1;

  999.                         }

  1000.                     }

  1001.                 }

  1002.             }

  1003.         }

  1004.     }

  1005. 

  1006.     s->cbp                     = cbp;

  1007.     s->cur_pic->mb_type[mb_xy] = mb_type;

  1008. 

  1009.     if (IS_INTRA(mb_type))

  1010.         s->chroma_pred_mode = ff_h264_check_intra_pred_mode(s->avctx, s->top_samples_available,

  1011.                                                             s->left_samples_available, DC_PRED8x8, 1);

  1012. 

  1013.     return 0;

  1014. }

  1015. 

  1016. static int svq3_decode_slice_header(AVCodecContext *avctx)

  1017. {

  1018.     SVQ3Context *s = avctx->priv_data;

  1019.     const int mb_xy   = s->mb_xy;

  1020.     int i, header;

  1021.     unsigned slice_id;

  1022. 

  1023.     header = get_bits(&s->gb, 8);

  1024. 

  1025.     if (((header & 0x9F) != 1 && (header & 0x9F) != 2) || (header & 0x60) == 0) {

  1026.         /* TODO: what? */

  1027.         av_log(avctx, AV_LOG_ERROR, "unsupported slice header (%02X)\n", header);

  1028.         return -1;

  1029.     } else {

  1030.         int slice_bits, slice_bytes, slice_length;

  1031.         int length = header >> 5 & 3;

  1032. 

  1033.         slice_length = show_bits(&s->gb, 8 * length);

  1034.         slice_bits   = slice_length * 8;

  1035.         slice_bytes  = slice_length + length - 1;

  1036. 

  1037.         if (slice_bytes > get_bits_left(&s->gb)) {

  1038.             av_log(avctx, AV_LOG_ERROR, "slice after bitstream end\n");

  1039.             return -1;

  1040.         }

  1041. 

  1042.         skip_bits(&s->gb, 8);

  1043. 

  1044.         av_fast_malloc(&s->slice_buf, &s->slice_size, slice_bytes + AV_INPUT_BUFFER_PADDING_SIZE);

  1045.         if (!s->slice_buf)

  1046.             return AVERROR(ENOMEM);

  1047. 

  1048.         memcpy(s->slice_buf, s->gb.buffer + s->gb.index / 8, slice_bytes);

  1049. 

  1050.         init_get_bits(&s->gb_slice, s->slice_buf, slice_bits);

  1051. 

  1052.         if (s->watermark_key) {

  1053.             uint32_t header = AV_RL32(&s->gb_slice.buffer[1]);

  1054.             AV_WL32(&s->gb_slice.buffer[1], header ^ s->watermark_key);

  1055.         }

  1056.         if (length > 0) {

  1057.             memcpy(s->slice_buf, &s->slice_buf[slice_length], length - 1);

  1058.         }

  1059.         skip_bits_long(&s->gb, slice_bytes * 8);

  1060.     }

  1061. 

  1062.     if ((slice_id = get_interleaved_ue_golomb(&s->gb_slice)) >= 3) {

  1063.         av_log(s->avctx, AV_LOG_ERROR, "illegal slice type %u \n", slice_id);

  1064.         return -1;

  1065.     }

  1066. 

  1067.     s->pict_type = ff_h264_golomb_to_pict_type[slice_id];

  1068. 

  1069.     if ((header & 0x9F) == 2) {

  1070.         i = (s->mb_num < 64) ? 6 : (1 + av_log2(s->mb_num - 1));

  1071.         get_bits(&s->gb_slice, i);

  1072.     } else {

  1073.         skip_bits1(&s->gb_slice);

  1074.     }

  1075. 

  1076.     s->slice_num      = get_bits(&s->gb_slice, 8);

  1077.     s->qscale         = get_bits(&s->gb_slice, 5);

  1078.     s->adaptive_quant = get_bits1(&s->gb_slice);

  1079. 

  1080.     /* unknown fields */

  1081.     skip_bits1(&s->gb_slice);

  1082. 

  1083.     if (s->unknown_flag)

  1084.         skip_bits1(&s->gb_slice);

  1085. 

  1086.     skip_bits1(&s->gb_slice);

  1087.     skip_bits(&s->gb_slice, 2);

  1088. 

  1089.     while (get_bits1(&s->gb_slice))

  1090.         skip_bits(&s->gb_slice, 8);

  1091. 

  1092.     /* reset intra predictors and invalidate motion vector references */

  1093.     if (s->mb_x > 0) {

  1094.         memset(s->intra4x4_pred_mode + s->mb2br_xy[mb_xy - 1] + 3,

  1095.                -1, 4 * sizeof(int8_t));

  1096.         memset(s->intra4x4_pred_mode + s->mb2br_xy[mb_xy - s->mb_x],

  1097.                -1, 8 * sizeof(int8_t) * s->mb_x);

  1098.     }

  1099.     if (s->mb_y > 0) {

  1100.         memset(s->intra4x4_pred_mode + s->mb2br_xy[mb_xy - s->mb_stride],

  1101.                -1, 8 * sizeof(int8_t) * (s->mb_width - s->mb_x));

  1102. 

  1103.         if (s->mb_x > 0)

  1104.             s->intra4x4_pred_mode[s->mb2br_xy[mb_xy - s->mb_stride - 1] + 3] = -1;

  1105.     }

  1106. 

  1107.     return 0;

  1108. }

  1109. 

  1110. static void init_dequant4_coeff_table(SVQ3Context *s)

  1111. {

  1112.     int q, x;

  1113.     const int max_qp = 51;

  1114. 

  1115.     for (q = 0; q < max_qp + 1; q++) {

  1116.         int shift = ff_h264_quant_div6[q] + 2;

  1117.         int idx   = ff_h264_quant_rem6[q];

  1118.         for (x = 0; x < 16; x++)

  1119.             s->dequant4_coeff[q][(x >> 2) | ((x << 2) & 0xF)] =

  1120.                 ((uint32_t)ff_h264_dequant4_coeff_init[idx][(x & 1) + ((x >> 2) & 1)] * 16) << shift;

  1121.     }

  1122. }

  1123. 

  1124. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  1125. {

  1126.     SVQ3Context *s = avctx->priv_data;

  1127.     int m, x, y;

  1128.     unsigned char *extradata;

  1129.     unsigned char *extradata_end;

  1130.     unsigned int size;

  1131.     int marker_found = 0;

  1132. 

  1133.     s->cur_pic  = av_mallocz(sizeof(*s->cur_pic));

  1134.     s->last_pic = av_mallocz(sizeof(*s->last_pic));

  1135.     s->next_pic = av_mallocz(sizeof(*s->next_pic));

  1136.     if (!s->next_pic || !s->last_pic || !s->cur_pic) {

  1137.         av_freep(&s->cur_pic);

  1138.         av_freep(&s->last_pic);

  1139.         av_freep(&s->next_pic);

  1140.         return AVERROR(ENOMEM);

  1141.     }

  1142. 

  1143.     s->cur_pic->f  = av_frame_alloc();

  1144.     s->last_pic->f = av_frame_alloc();

  1145.     s->next_pic->f = av_frame_alloc();

  1146.     if (!s->cur_pic->f || !s->last_pic->f || !s->next_pic->f)

  1147.         return AVERROR(ENOMEM);

  1148. 

  1149.     ff_h264dsp_init(&s->h264dsp, 8, 1);

  1150.     ff_h264_pred_init(&s->hpc, AV_CODEC_ID_SVQ3, 8, 1);

  1151.     ff_videodsp_init(&s->vdsp, 8);

  1152. 

  1153.     ff_hpeldsp_init(&s->hdsp, avctx->flags);

  1154.     ff_tpeldsp_init(&s->tdsp);

  1155. 

  1156.     avctx->pix_fmt     = AV_PIX_FMT_YUVJ420P;

  1157.     avctx->color_range = AVCOL_RANGE_JPEG;

  1158. 

  1159.     s->avctx         = avctx;

  1160.     s->halfpel_flag  = 1;

  1161.     s->thirdpel_flag = 1;

  1162.     s->unknown_flag  = 0;

  1163. 

  1164.     /* prowl for the "SEQH" marker in the extradata */

  1165.     extradata     = (unsigned char *)avctx->extradata;

  1166.     extradata_end = avctx->extradata + avctx->extradata_size;

  1167.     if (extradata) {

  1168.         for (m = 0; m + 8 < avctx->extradata_size; m++) {

  1169.             if (!memcmp(extradata, "SEQH", 4)) {

  1170.                 marker_found = 1;

  1171.                 break;

  1172.             }

  1173.             extradata++;

  1174.         }

  1175.     }

  1176. 

  1177.     /* if a match was found, parse the extra data */

  1178.     if (marker_found) {

  1179.         GetBitContext gb;

  1180.         int frame_size_code;

  1181. 

  1182.         size = AV_RB32(&extradata[4]);

  1183.         if (size > extradata_end - extradata - 8)

  1184.             return AVERROR_INVALIDDATA;

  1185.         init_get_bits(&gb, extradata + 8, size * 8);

  1186. 

  1187.         /* 'frame size code' and optional 'width, height' */

  1188.         frame_size_code = get_bits(&gb, 3);

  1189.         switch (frame_size_code) {

  1190.         case 0:

  1191.             avctx->width  = 160;

  1192.             avctx->height = 120;

  1193.             break;

  1194.         case 1:

  1195.             avctx->width  = 128;

  1196.             avctx->height =  96;

  1197.             break;

  1198.         case 2:

  1199.             avctx->width  = 176;

  1200.             avctx->height = 144;

  1201.             break;

  1202.         case 3:

  1203.             avctx->width  = 352;

  1204.             avctx->height = 288;

  1205.             break;

  1206.         case 4:

  1207.             avctx->width  = 704;

  1208.             avctx->height = 576;

  1209.             break;

  1210.         case 5:

  1211.             avctx->width  = 240;

  1212.             avctx->height = 180;

  1213.             break;

  1214.         case 6:

  1215.             avctx->width  = 320;

  1216.             avctx->height = 240;

  1217.             break;

  1218.         case 7:

  1219.             avctx->width  = get_bits(&gb, 12);

  1220.             avctx->height = get_bits(&gb, 12);

  1221.             break;

  1222.         }

  1223. 

  1224.         s->halfpel_flag  = get_bits1(&gb);

  1225.         s->thirdpel_flag = get_bits1(&gb);

  1226. 

  1227.         /* unknown fields */

  1228.         skip_bits1(&gb);

  1229.         skip_bits1(&gb);

  1230.         skip_bits1(&gb);

  1231.         skip_bits1(&gb);

  1232. 

  1233.         s->low_delay = get_bits1(&gb);

  1234. 

  1235.         /* unknown field */

  1236.         skip_bits1(&gb);

  1237. 

  1238.         while (get_bits1(&gb))

  1239.             skip_bits(&gb, 8);

  1240. 

  1241.         s->unknown_flag  = get_bits1(&gb);

  1242.         avctx->has_b_frames = !s->low_delay;

  1243.         if (s->unknown_flag) {

  1244. #if CONFIG_ZLIB

  1245.             unsigned watermark_width  = get_interleaved_ue_golomb(&gb);

  1246.             unsigned watermark_height = get_interleaved_ue_golomb(&gb);

  1247.             int u1                    = get_interleaved_ue_golomb(&gb);

  1248.             int u2                    = get_bits(&gb, 8);

  1249.             int u3                    = get_bits(&gb, 2);

  1250.             int u4                    = get_interleaved_ue_golomb(&gb);

  1251.             unsigned long buf_len     = watermark_width *

  1252.                                         watermark_height * 4;

  1253.             int offset                = get_bits_count(&gb) + 7 >> 3;

  1254.             uint8_t *buf;

  1255. 

  1256.             if (watermark_height > 0 &&

  1257.                 (uint64_t)watermark_width * 4 > UINT_MAX / watermark_height)

  1258.                 return -1;

  1259. 

  1260.             buf = av_malloc(buf_len);

  1261.             av_log(avctx, AV_LOG_DEBUG, "watermark size: %ux%u\n",

  1262.                    watermark_width, watermark_height);

  1263.             av_log(avctx, AV_LOG_DEBUG,

  1264.                    "u1: %x u2: %x u3: %x compressed data size: %d offset: %d\n",

  1265.                    u1, u2, u3, u4, offset);

  1266.             if (uncompress(buf, &buf_len, extradata + 8 + offset,

  1267.                            size - offset) != Z_OK) {

  1268.                 av_log(avctx, AV_LOG_ERROR,

  1269.                        "could not uncompress watermark logo\n");

  1270.                 av_free(buf);

  1271.                 return -1;

  1272.             }

  1273.             s->watermark_key = ff_svq1_packet_checksum(buf, buf_len, 0);

  1274.             s->watermark_key = s->watermark_key << 16 | s->watermark_key;

  1275.             av_log(avctx, AV_LOG_DEBUG,

  1276.                    "watermark key %#"PRIx32"\n", s->watermark_key);

  1277.             av_free(buf);

  1278. #else

  1279.             av_log(avctx, AV_LOG_ERROR,

  1280.                    "this svq3 file contains watermark which need zlib support compiled in\n");

  1281.             return -1;

  1282. #endif

  1283.         }

  1284.     }

  1285. 

  1286.     s->mb_width   = (avctx->width + 15) / 16;

  1287.     s->mb_height  = (avctx->height + 15) / 16;

  1288.     s->mb_stride  = s->mb_width + 1;

  1289.     s->mb_num     = s->mb_width * s->mb_height;

  1290.     s->b_stride   = 4 * s->mb_width;

  1291.     s->h_edge_pos = s->mb_width * 16;

  1292.     s->v_edge_pos = s->mb_height * 16;

  1293. 

  1294.     s->intra4x4_pred_mode = av_mallocz(s->mb_stride * 2 * 8);

  1295.     if (!s->intra4x4_pred_mode)

  1296.         return AVERROR(ENOMEM);

  1297. 

  1298.     s->mb2br_xy = av_mallocz(s->mb_stride * (s->mb_height + 1) *

  1299.                              sizeof(*s->mb2br_xy));

  1300.     if (!s->mb2br_xy)

  1301.         return AVERROR(ENOMEM);

  1302. 

  1303.     for (y = 0; y < s->mb_height; y++)

  1304.         for (x = 0; x < s->mb_width; x++) {

  1305.             const int mb_xy = x + y * s->mb_stride;

  1306. 

  1307.             s->mb2br_xy[mb_xy] = 8 * (mb_xy % (2 * s->mb_stride));

  1308.         }

  1309. 

  1310.     init_dequant4_coeff_table(s);

  1311. 

  1312.     return 0;

  1313. }

  1314. 

  1315. static void free_picture(AVCodecContext *avctx, SVQ3Frame *pic)

  1316. {

  1317.     int i;

  1318.     for (i = 0; i < 2; i++) {

  1319.         av_buffer_unref(&pic->motion_val_buf[i]);

  1320.         av_buffer_unref(&pic->ref_index_buf[i]);

  1321.     }

  1322.     av_buffer_unref(&pic->mb_type_buf);

  1323. 

  1324.     av_frame_unref(pic->f);

  1325. }

  1326. 

  1327. static int get_buffer(AVCodecContext *avctx, SVQ3Frame *pic)

  1328. {

  1329.     SVQ3Context *s = avctx->priv_data;

  1330.     const int big_mb_num    = s->mb_stride * (s->mb_height + 1) + 1;

  1331.     const int mb_array_size = s->mb_stride * s->mb_height;

  1332.     const int b4_stride     = s->mb_width * 4 + 1;

  1333.     const int b4_array_size = b4_stride * s->mb_height * 4;

  1334.     int ret;

  1335. 

  1336.     if (!pic->motion_val_buf[0]) {

  1337.         int i;

  1338. 

  1339.         pic->mb_type_buf = av_buffer_allocz((big_mb_num + s->mb_stride) * sizeof(uint32_t));

  1340.         if (!pic->mb_type_buf)

  1341.             return AVERROR(ENOMEM);

  1342.         pic->mb_type = (uint32_t*)pic->mb_type_buf->data + 2 * s->mb_stride + 1;

  1343. 

  1344.         for (i = 0; i < 2; i++) {

  1345.             pic->motion_val_buf[i] = av_buffer_allocz(2 * (b4_array_size + 4) * sizeof(int16_t));

  1346.             pic->ref_index_buf[i]  = av_buffer_allocz(4 * mb_array_size);

  1347.             if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i]) {

  1348.                 ret = AVERROR(ENOMEM);

  1349.                 goto fail;

  1350.             }

  1351. 

  1352.             pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;

  1353.             pic->ref_index[i]  = pic->ref_index_buf[i]->data;

  1354.         }

  1355.     }

  1356. 

  1357.     ret = ff_get_buffer(avctx, pic->f,

  1358.                         (s->pict_type != AV_PICTURE_TYPE_B) ?

  1359.                          AV_GET_BUFFER_FLAG_REF : 0);

  1360.     if (ret < 0)

  1361.         goto fail;

  1362. 

  1363.     if (!s->edge_emu_buffer) {

  1364.         s->edge_emu_buffer = av_mallocz(pic->f->linesize[0] * 17);

  1365.         if (!s->edge_emu_buffer)

  1366.             return AVERROR(ENOMEM);

  1367.     }

  1368. 

  1369.     return 0;

  1370. fail:

  1371.     free_picture(avctx, pic);

  1372.     return ret;

  1373. }

  1374. 

  1375. static int svq3_decode_frame(AVCodecContext *avctx, void *data,

  1376.                              int *got_frame, AVPacket *avpkt)

  1377. {

  1378.     const uint8_t *buf = avpkt->data;

  1379.     SVQ3Context *s     = avctx->priv_data;

  1380.     int buf_size       = avpkt->size;

  1381.     int ret, m, i;

  1382. 

  1383.     /* special case for last picture */

  1384.     if (buf_size == 0) {

  1385.         if (s->next_pic->f->data[0] && !s->low_delay && !s->last_frame_output) {

  1386.             ret = av_frame_ref(data, s->next_pic->f);

  1387.             if (ret < 0)

  1388.                 return ret;

  1389.             s->last_frame_output = 1;

  1390.             *got_frame          = 1;

  1391.         }

  1392.         return 0;

  1393.     }

  1394. 

  1395.     ret = init_get_bits(&s->gb, buf, 8 * buf_size);

  1396.     if (ret < 0)

  1397.         return ret;

  1398. 

  1399.     s->mb_x = s->mb_y = s->mb_xy = 0;

  1400. 

  1401.     if (svq3_decode_slice_header(avctx))

  1402.         return -1;

  1403. 

  1404.     if (s->pict_type != AV_PICTURE_TYPE_B)

  1405.         FFSWAP(SVQ3Frame*, s->next_pic, s->last_pic);

  1406. 

  1407.     av_frame_unref(s->cur_pic->f);

  1408. 

  1409.     /* for skipping the frame */

  1410.     s->cur_pic->f->pict_type = s->pict_type;

  1411.     s->cur_pic->f->key_frame = (s->pict_type == AV_PICTURE_TYPE_I);

  1412. 

  1413.     ret = get_buffer(avctx, s->cur_pic);

  1414.     if (ret < 0)

  1415.         return ret;

  1416. 

  1417.     for (i = 0; i < 16; i++) {

  1418.         s->block_offset[i]           = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * s->cur_pic->f->linesize[0] * ((scan8[i] - scan8[0]) >> 3);

  1419.         s->block_offset[48 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * s->cur_pic->f->linesize[0] * ((scan8[i] - scan8[0]) >> 3);

  1420.     }

  1421.     for (i = 0; i < 16; i++) {

  1422.         s->block_offset[16 + i]      =

  1423.         s->block_offset[32 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * s->cur_pic->f->linesize[1] * ((scan8[i] - scan8[0]) >> 3);

  1424.         s->block_offset[48 + 16 + i] =

  1425.         s->block_offset[48 + 32 + i] = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * s->cur_pic->f->linesize[1] * ((scan8[i] - scan8[0]) >> 3);

  1426.     }

  1427. 

  1428.     if (s->pict_type != AV_PICTURE_TYPE_I) {

  1429.         if (!s->last_pic->f->data[0]) {

  1430.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1431.             ret = get_buffer(avctx, s->last_pic);

  1432.             if (ret < 0)

  1433.                 return ret;

  1434.             memset(s->last_pic->f->data[0], 0, avctx->height * s->last_pic->f->linesize[0]);

  1435.             memset(s->last_pic->f->data[1], 0x80, (avctx->height / 2) *

  1436.                    s->last_pic->f->linesize[1]);

  1437.             memset(s->last_pic->f->data[2], 0x80, (avctx->height / 2) *

  1438.                    s->last_pic->f->linesize[2]);

  1439.         }

  1440. 

  1441.         if (s->pict_type == AV_PICTURE_TYPE_B && !s->next_pic->f->data[0]) {

  1442.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1443.             ret = get_buffer(avctx, s->next_pic);

  1444.             if (ret < 0)

  1445.                 return ret;

  1446.             memset(s->next_pic->f->data[0], 0, avctx->height * s->next_pic->f->linesize[0]);

  1447.             memset(s->next_pic->f->data[1], 0x80, (avctx->height / 2) *

  1448.                    s->next_pic->f->linesize[1]);

  1449.             memset(s->next_pic->f->data[2], 0x80, (avctx->height / 2) *

  1450.                    s->next_pic->f->linesize[2]);

  1451.         }

  1452.     }

  1453. 

  1454.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  1455.         av_log(s->avctx, AV_LOG_DEBUG,

  1456.                "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n",

  1457.                av_get_picture_type_char(s->pict_type),

  1458.                s->halfpel_flag, s->thirdpel_flag,

  1459.                s->adaptive_quant, s->qscale, s->slice_num);

  1460. 

  1461.     if (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B ||

  1462.         avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I ||

  1463.         avctx->skip_frame >= AVDISCARD_ALL)

  1464.         return 0;

  1465. 

  1466.     if (s->next_p_frame_damaged) {

  1467.         if (s->pict_type == AV_PICTURE_TYPE_B)

  1468.             return 0;

  1469.         else

  1470.             s->next_p_frame_damaged = 0;

  1471.     }

  1472. 

  1473.     if (s->pict_type == AV_PICTURE_TYPE_B) {

  1474.         s->frame_num_offset = s->slice_num - s->prev_frame_num;

  1475. 

  1476.         if (s->frame_num_offset < 0)

  1477.             s->frame_num_offset += 256;

  1478.         if (s->frame_num_offset == 0 ||

  1479.             s->frame_num_offset >= s->prev_frame_num_offset) {

  1480.             av_log(s->avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  1481.             return -1;

  1482.         }

  1483.     } else {

  1484.         s->prev_frame_num        = s->frame_num;

  1485.         s->frame_num             = s->slice_num;

  1486.         s->prev_frame_num_offset = s->frame_num - s->prev_frame_num;

  1487. 

  1488.         if (s->prev_frame_num_offset < 0)

  1489.             s->prev_frame_num_offset += 256;

  1490.     }

  1491. 

  1492.     for (m = 0; m < 2; m++) {

  1493.         int i;

  1494.         for (i = 0; i < 4; i++) {

  1495.             int j;

  1496.             for (j = -1; j < 4; j++)

  1497.                 s->ref_cache[m][scan8[0] + 8 * i + j] = 1;

  1498.             if (i < 3)

  1499.                 s->ref_cache[m][scan8[0] + 8 * i + j] = PART_NOT_AVAILABLE;

  1500.         }

  1501.     }

  1502. 

  1503.     for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  1504.         for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  1505.             unsigned mb_type;

  1506.             s->mb_xy = s->mb_x + s->mb_y * s->mb_stride;

  1507. 

  1508.             if ((get_bits_left(&s->gb_slice)) <= 7) {

  1509.                 if (((get_bits_count(&s->gb_slice) & 7) == 0 ||

  1510.                     show_bits(&s->gb_slice, get_bits_left(&s->gb_slice) & 7) == 0)) {

  1511. 

  1512.                     if (svq3_decode_slice_header(avctx))

  1513.                         return -1;

  1514.                 }

  1515.                 /* TODO: support s->mb_skip_run */

  1516.             }

  1517. 

  1518.             mb_type = get_interleaved_ue_golomb(&s->gb_slice);

  1519. 

  1520.             if (s->pict_type == AV_PICTURE_TYPE_I)

  1521.                 mb_type += 8;

  1522.             else if (s->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4)

  1523.                 mb_type += 4;

  1524.             if (mb_type > 33 || svq3_decode_mb(s, mb_type)) {

  1525.                 av_log(s->avctx, AV_LOG_ERROR,

  1526.                        "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1527.                 return -1;

  1528.             }

  1529. 

  1530.             if (mb_type != 0)

  1531.                 hl_decode_mb(s);

  1532. 

  1533.             if (s->pict_type != AV_PICTURE_TYPE_B && !s->low_delay)

  1534.                 s->cur_pic->mb_type[s->mb_x + s->mb_y * s->mb_stride] =

  1535.                     (s->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1536.         }

  1537. 

  1538.         ff_draw_horiz_band(avctx, s->cur_pic->f,

  1539.                            s->last_pic->f->data[0] ? s->last_pic->f : NULL,

  1540.                            16 * s->mb_y, 16, PICT_FRAME, 0,

  1541.                            s->low_delay);

  1542.     }

  1543. 

  1544.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay)

  1545.         ret = av_frame_ref(data, s->cur_pic->f);

  1546.     else if (s->last_pic->f->data[0])

  1547.         ret = av_frame_ref(data, s->last_pic->f);

  1548.     if (ret < 0)

  1549.         return ret;

  1550. 

  1551.     /* Do not output the last pic after seeking. */

  1552.     if (s->last_pic->f->data[0] || s->low_delay)

  1553.         *got_frame = 1;

  1554. 

  1555.     if (s->pict_type != AV_PICTURE_TYPE_B) {

  1556.         FFSWAP(SVQ3Frame*, s->cur_pic, s->next_pic);

  1557.     } else {

  1558.         av_frame_unref(s->cur_pic->f);

  1559.     }

  1560. 

  1561.     return buf_size;

  1562. }

  1563. 

  1564. static av_cold int svq3_decode_end(AVCodecContext *avctx)

  1565. {

  1566.     SVQ3Context *s = avctx->priv_data;

  1567. 

  1568.     free_picture(avctx, s->cur_pic);

  1569.     free_picture(avctx, s->next_pic);

  1570.     free_picture(avctx, s->last_pic);

  1571.     av_frame_free(&s->cur_pic->f);

  1572.     av_frame_free(&s->next_pic->f);

  1573.     av_frame_free(&s->last_pic->f);

  1574.     av_freep(&s->cur_pic);

  1575.     av_freep(&s->next_pic);

  1576.     av_freep(&s->last_pic);

  1577.     av_freep(&s->slice_buf);

  1578.     av_freep(&s->intra4x4_pred_mode);

  1579.     av_freep(&s->edge_emu_buffer);

  1580.     av_freep(&s->mb2br_xy);

  1581. 

  1582.     return 0;

  1583. }

  1584. 

  1585. AVCodec ff_svq3_decoder = {

  1586.     .name           = "svq3",

  1587.     .long_name      = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1588.     .type           = AVMEDIA_TYPE_VIDEO,

  1589.     .id             = AV_CODEC_ID_SVQ3,

  1590.     .priv_data_size = sizeof(SVQ3Context),

  1591.     .init           = svq3_decode_init,

  1592.     .close          = svq3_decode_end,

  1593.     .decode         = svq3_decode_frame,

  1594.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND |

  1595.                       AV_CODEC_CAP_DR1             |

  1596.                       AV_CODEC_CAP_DELAY,

  1597.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P,

  1598.                                                      AV_PIX_FMT_NONE},

  1599. };