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FFmpeg/libavcodec/svq3.c

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  1. /*

  2.  * Copyright (c) 2003 The FFmpeg Project

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. /*

  22.  * How to use this decoder:

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

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

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

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

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

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

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

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

  31.  *

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

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

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

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

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

  37.  *

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

  39.  * correctly decodes this file:

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

  41.  */

  42. 

  43. #include <inttypes.h>

  44. 

  45. #include "libavutil/attributes.h"

  46. #include "libavutil/crc.h"

  47. 

  48. #include "internal.h"

  49. #include "avcodec.h"

  50. #include "mpegutils.h"

  51. #include "h264dec.h"

  52. #include "h264data.h"

  53. #include "golomb.h"

  54. #include "hpeldsp.h"

  55. #include "mathops.h"

  56. #include "rectangle.h"

  57. #include "tpeldsp.h"

  58. 

  59. #if CONFIG_ZLIB

  60. #include <zlib.h>

  61. #endif

  62. 

  63. #include "svq1.h"

  64. 

  65. /**

  66.  * @file

  67.  * svq3 decoder.

  68.  */

  69. 

  70. typedef struct SVQ3Frame {

  71.     AVFrame *f;

  72. 

  73.     AVBufferRef *motion_val_buf[2];

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

  75. 

  76.     AVBufferRef *mb_type_buf;

  77.     uint32_t *mb_type;

  78. 

  79. 

  80.     AVBufferRef *ref_index_buf[2];

  81.     int8_t *ref_index[2];

  82. } SVQ3Frame;

  83. 

  84. typedef struct SVQ3Context {

  85.     AVCodecContext *avctx;

  86. 

  87.     H264DSPContext  h264dsp;

  88.     H264PredContext hpc;

  89.     HpelDSPContext hdsp;

  90.     TpelDSPContext tdsp;

  91.     VideoDSPContext vdsp;

  92. 

  93.     SVQ3Frame *cur_pic;

  94.     SVQ3Frame *next_pic;

  95.     SVQ3Frame *last_pic;

  96.     GetBitContext gb;

  97.     GetBitContext gb_slice;

  98.     uint8_t *slice_buf;

  99.     int slice_size;

  100.     int halfpel_flag;

  101.     int thirdpel_flag;

  102.     int has_watermark;

  103.     uint32_t watermark_key;

  104.     uint8_t *buf;

  105.     int buf_size;

  106.     int adaptive_quant;

  107.     int next_p_frame_damaged;

  108.     int h_edge_pos;

  109.     int v_edge_pos;

  110.     int last_frame_output;

  111.     int slice_num;

  112.     int qscale;

  113.     int cbp;

  114.     int frame_num;

  115.     int frame_num_offset;

  116.     int prev_frame_num_offset;

  117.     int prev_frame_num;

  118. 

  119.     enum AVPictureType pict_type;

  120.     enum AVPictureType slice_type;

  121.     int low_delay;

  122. 

  123.     int mb_x, mb_y;

  124.     int mb_xy;

  125.     int mb_width, mb_height;

  126.     int mb_stride, mb_num;

  127.     int b_stride;

  128. 

  129.     uint32_t *mb2br_xy;

  130. 

  131.     int chroma_pred_mode;

  132.     int intra16x16_pred_mode;

  133. 

  134.     int8_t   intra4x4_pred_mode_cache[5 * 8];

  135.     int8_t (*intra4x4_pred_mode);

  136. 

  137.     unsigned int top_samples_available;

  138.     unsigned int topright_samples_available;

  139.     unsigned int left_samples_available;

  140. 

  141.     uint8_t *edge_emu_buffer;

  142. 

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

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

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

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

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

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

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

  150.     SVQ3Frame frames[3];

  151. } SVQ3Context;

  152. 

  153. #define FULLPEL_MODE  1

  154. #define HALFPEL_MODE  2

  155. #define THIRDPEL_MODE 3

  156. #define PREDICT_MODE  4

  157. 

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

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

  160.  *         |  /|

  161.  * o   o   o / o

  162.  * | / |   |/  |

  163.  * o   o   o   o

  164.  *   /

  165.  * o-->o-->o-->o

  166.  */

  167. static const uint8_t svq3_scan[16] = {

  168.     0 + 0 * 4, 1 + 0 * 4, 2 + 0 * 4, 2 + 1 * 4,

  169.     2 + 2 * 4, 3 + 0 * 4, 3 + 1 * 4, 3 + 2 * 4,

  170.     0 + 1 * 4, 0 + 2 * 4, 1 + 1 * 4, 1 + 2 * 4,

  171.     0 + 3 * 4, 1 + 3 * 4, 2 + 3 * 4, 3 + 3 * 4,

  172. };

  173. 

  174. static const uint8_t luma_dc_zigzag_scan[16] = {

  175.     0 * 16 + 0 * 64, 1 * 16 + 0 * 64, 2 * 16 + 0 * 64, 0 * 16 + 2 * 64,

  176.     3 * 16 + 0 * 64, 0 * 16 + 1 * 64, 1 * 16 + 1 * 64, 2 * 16 + 1 * 64,

  177.     1 * 16 + 2 * 64, 2 * 16 + 2 * 64, 3 * 16 + 2 * 64, 0 * 16 + 3 * 64,

  178.     3 * 16 + 1 * 64, 1 * 16 + 3 * 64, 2 * 16 + 3 * 64, 3 * 16 + 3 * 64,

  179. };

  180. 

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

  182.     { 0, 0 },

  183.     { 1, 0 }, { 0, 1 },

  184.     { 0, 2 }, { 1, 1 }, { 2, 0 },

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

  186.     { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

  187.     { 4, 1 }, { 3, 2 }, { 2, 3 }, { 1, 4 },

  188.     { 2, 4 }, { 3, 3 }, { 4, 2 },

  189.     { 4, 3 }, { 3, 4 },

  190.     { 4, 4 }

  191. };

  192. 

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

  194.     { { 2, -1, -1, -1, -1 }, { 2, 1, -1, -1, -1 }, { 1, 2, -1, -1, -1 },

  195.       { 2,  1, -1, -1, -1 }, { 1, 2, -1, -1, -1 }, { 1, 2, -1, -1, -1 } },

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

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

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

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

  200.     { { 2,  0, -1, -1, -1 }, { 2, 0,  1,  4,  3 }, { 1, 2,  0,  4,  3 },

  201.       { 2,  1,  0,  4,  3 }, { 2, 1,  3,  4,  0 }, { 2, 4,  1,  0,  3 } },

  202.     { { 0,  2, -1, -1, -1 }, { 0, 2,  1,  3,  4 }, { 1, 2,  3,  0,  4 },

  203.       { 2,  0,  1,  3,  4 }, { 2, 1,  3,  0,  4 }, { 2, 0,  4,  3,  1 } },

  204.     { { 0,  2, -1, -1, -1 }, { 0, 2,  4,  1,  3 }, { 1, 4,  2,  0,  3 },

  205.       { 4,  2,  0,  1,  3 }, { 2, 0,  1,  4,  3 }, { 4, 2,  1,  0,  3 } },

  206. };

  207. 

  208. static const struct {

  209.     uint8_t run;

  210.     uint8_t level;

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

  212.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  213.       { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  214.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  215.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  216. };

  217. 

  218. static const uint32_t svq3_dequant_coeff[32] = {

  219.      3881,  4351,  4890,  5481,   6154,   6914,   7761,   8718,

  220.      9781, 10987, 12339, 13828,  15523,  17435,  19561,  21873,

  221.     24552, 27656, 30847, 34870,  38807,  43747,  49103,  54683,

  222.     61694, 68745, 77615, 89113, 100253, 109366, 126635, 141533

  223. };

  224. 

  225. static int svq3_decode_end(AVCodecContext *avctx);

  226. 

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

  228. {

  229.     const unsigned qmul = svq3_dequant_coeff[qp];

  230. #define stride 16

  231.     int i;

  232.     int temp[16];

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

  234. 

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

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

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

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

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

  240. 

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

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

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

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

  245.     }

  246. 

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

  248.         const int offset = x_offset[i];

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

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

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

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

  253. 

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

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

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

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

  258.     }

  259. }

  260. #undef stride

  261. 

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

  263.                             int stride, int qp, int dc)

  264. {

  265.     const int qmul = svq3_dequant_coeff[qp];

  266.     int i;

  267. 

  268.     if (dc) {

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

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

  271.         block[0] = 0;

  272.     }

  273. 

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

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

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

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

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

  279. 

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

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

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

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

  284.     }

  285. 

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

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

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

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

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

  291.         const int rr = (dc + 0x80000u);

  292. 

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

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

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

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

  297.     }

  298. 

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

  300. }

  301. 

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

  303.                                     int index, const int type)

  304. {

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

  306.         luma_dc_zigzag_scan, ff_zigzag_scan, svq3_scan, ff_h264_chroma_dc_scan

  307.     };

  308. 

  309.     int run, level, sign, limit;

  310.     unsigned vlc;

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

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

  313. 

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

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

  316.             if ((int32_t)vlc < 0)

  317.                 return -1;

  318. 

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

  320.             vlc      = vlc + 1 >> 1;

  321. 

  322.             if (type == 3) {

  323.                 if (vlc < 3) {

  324.                     run   = 0;

  325.                     level = vlc;

  326.                 } else if (vlc < 4) {

  327.                     run   = 1;

  328.                     level = 1;

  329.                 } else {

  330.                     run   = vlc & 0x3;

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

  332.                 }

  333.             } else {

  334.                 if (vlc < 16U) {

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

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

  337.                 } else if (intra) {

  338.                     run   = vlc & 0x7;

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

  340.                 } else {

  341.                     run   = vlc & 0xF;

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

  343.                 }

  344.             }

  345. 

  346. 

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

  348.                 return -1;

  349. 

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

  351.         }

  352. 

  353.         if (type != 2) {

  354.             break;

  355.         }

  356.     }

  357. 

  358.     return 0;

  359. }

  360. 

  361. static av_always_inline int

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

  363.                        int i, int list, int part_width)

  364. {

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

  366. 

  367.     if (topright_ref != PART_NOT_AVAILABLE) {

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

  369.         return topright_ref;

  370.     } else {

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

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

  373.     }

  374. }

  375. 

  376. /**

  377.  * Get the predicted MV.

  378.  * @param n the block index

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

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

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

  382.  */

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

  384.                                               int part_width, int list,

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

  386. {

  387.     const int index8       = scan8[n];

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

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

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

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

  392.     const int16_t *C;

  393.     int diagonal_ref, match_count;

  394. 

  395. /* mv_cache

  396.  * B . . A T T T T

  397.  * U . . L . . , .

  398.  * U . . L . . . .

  399.  * U . . L . . , .

  400.  * . . . L . . . .

  401.  */

  402. 

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

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

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

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

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

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

  409.         if (left_ref == ref) {

  410.             *mx = A[0];

  411.             *my = A[1];

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

  413.             *mx = B[0];

  414.             *my = B[1];

  415.         } else {

  416.             *mx = C[0];

  417.             *my = C[1];

  418.         }

  419.     } else {

  420.         if (top_ref      == PART_NOT_AVAILABLE &&

  421.             diagonal_ref == PART_NOT_AVAILABLE &&

  422.             left_ref     != PART_NOT_AVAILABLE) {

  423.             *mx = A[0];

  424.             *my = A[1];

  425.         } else {

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

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

  428.         }

  429.     }

  430. }

  431. 

  432. static inline void svq3_mc_dir_part(SVQ3Context *s,

  433.                                     int x, int y, int width, int height,

  434.                                     int mx, int my, int dxy,

  435.                                     int thirdpel, int dir, int avg)

  436. {

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

  438.     uint8_t *src, *dest;

  439.     int i, emu = 0;

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

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

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

  443. 

  444.     mx += x;

  445.     my += y;

  446. 

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

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

  449.         emu = 1;

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

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

  452.     }

  453. 

  454.     /* form component predictions */

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

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

  457. 

  458.     if (emu) {

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

  460.                                  linesize, linesize,

  461.                                  width + 1, height + 1,

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

  463.         src = s->edge_emu_buffer;

  464.     }

  465.     if (thirdpel)

  466.         (avg ? s->tdsp.avg_tpel_pixels_tab

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

  468.                                                  width, height);

  469.     else

  470.         (avg ? s->hdsp.avg_pixels_tab

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

  472.                                                        height);

  473. 

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

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

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

  477.         width  = width  >> 1;

  478.         height = height >> 1;

  479.         blocksize++;

  480. 

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

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

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

  484. 

  485.             if (emu) {

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

  487.                                          uvlinesize, uvlinesize,

  488.                                          width + 1, height + 1,

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

  490.                                          s->v_edge_pos >> 1);

  491.                 src = s->edge_emu_buffer;

  492.             }

  493.             if (thirdpel)

  494.                 (avg ? s->tdsp.avg_tpel_pixels_tab

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

  496.                                                          uvlinesize,

  497.                                                          width, height);

  498.             else

  499.                 (avg ? s->hdsp.avg_pixels_tab

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

  501.                                                                uvlinesize,

  502.                                                                height);

  503.         }

  504.     }

  505. }

  506. 

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

  508.                               int dir, int avg)

  509. {

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

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

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

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

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

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

  516. 

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

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

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

  520.                              (4 * s->mb_y + (i >> 2)) * s->b_stride;

  521.             int dxy;

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

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

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

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

  526. 

  527.             if (mode != PREDICT_MODE) {

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

  529.             } else {

  530.                 mx = s->next_pic->motion_val[0][b_xy][0] * 2;

  531.                 my = s->next_pic->motion_val[0][b_xy][1] * 2;

  532. 

  533.                 if (dir == 0) {

  534.                     mx = mx * s->frame_num_offset /

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

  536.                     my = my * s->frame_num_offset /

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

  538.                 } else {

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

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

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

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

  543.                 }

  544.             }

  545. 

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

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

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

  549. 

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

  551.             if (mode == PREDICT_MODE) {

  552.                 dx = dy = 0;

  553.             } else {

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

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

  556. 

  557.                 if (dx != (int16_t)dx || dy != (int16_t)dy) {

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

  559.                     return -1;

  560.                 }

  561.             }

  562. 

  563.             /* compute motion vector */

  564.             if (mode == THIRDPEL_MODE) {

  565.                 int fx, fy;

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

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

  568.                 fx  = (unsigned)(mx + 0x30000) / 3 - 0x10000;

  569.                 fy  = (unsigned)(my + 0x30000) / 3 - 0x10000;

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

  571. 

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

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

  574.                 mx += mx;

  575.                 my += my;

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

  577.                 mx  = (unsigned)(mx + 1 + 0x30000) / 3 + dx - 0x10000;

  578.                 my  = (unsigned)(my + 1 + 0x30000) / 3 + dy - 0x10000;

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

  580. 

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

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

  583.                 mx *= 3;

  584.                 my *= 3;

  585.             } else {

  586.                 mx = (unsigned)(mx + 3 + 0x60000) / 6 + dx - 0x10000;

  587.                 my = (unsigned)(my + 3 + 0x60000) / 6 + dy - 0x10000;

  588. 

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

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

  591.                 mx *= 6;

  592.                 my *= 6;

  593.             }

  594. 

  595.             /* update mv_cache */

  596.             if (mode != PREDICT_MODE) {

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

  598. 

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

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

  601. 

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

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

  604.                 }

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

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

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

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

  609.             }

  610. 

  611.             /* write back motion vectors */

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

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

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

  615.         }

  616. 

  617.     return 0;

  618. }

  619. 

  620. static av_always_inline void hl_decode_mb_idct_luma(SVQ3Context *s,

  621.                                                     int mb_type, const int *block_offset,

  622.                                                     int linesize, uint8_t *dest_y)

  623. {

  624.     int i;

  625.     if (!IS_INTRA4x4(mb_type)) {

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

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

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

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

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

  631.             }

  632.     }

  633. }

  634. 

  635. static av_always_inline void hl_decode_mb_predict_luma(SVQ3Context *s,

  636.                                                        int mb_type,

  637.                                                        const int *block_offset,

  638.                                                        int linesize,

  639.                                                        uint8_t *dest_y)

  640. {

  641.     int i;

  642.     int qscale = s->qscale;

  643. 

  644.     if (IS_INTRA4x4(mb_type)) {

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

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

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

  648. 

  649.             uint8_t *topright;

  650.             int nnz, tr;

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

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

  653.                 av_assert2(s->mb_y || linesize <= block_offset[i]);

  654.                 if (!topright_avail) {

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

  656.                     topright = (uint8_t *)&tr;

  657.                 } else

  658.                     topright = ptr + 4 - linesize;

  659.             } else

  660.                 topright = NULL;

  661. 

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

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

  664.             if (nnz) {

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

  666.             }

  667.         }

  668.     } else {

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

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

  671.     }

  672. }

  673. 

  674. static void hl_decode_mb(SVQ3Context *s)

  675. {

  676.     const int mb_x    = s->mb_x;

  677.     const int mb_y    = s->mb_y;

  678.     const int mb_xy   = s->mb_xy;

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

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

  681.     int linesize, uvlinesize;

  682.     int i, j;

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

  684.     const int block_h   = 16 >> 1;

  685. 

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

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

  688. 

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

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

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

  692. 

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

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

  695. 

  696.     if (IS_INTRA(mb_type)) {

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

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

  699. 

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

  701.     }

  702. 

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

  704. 

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

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

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

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

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

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

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

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

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

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

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

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

  717.                 }

  718.         }

  719.     }

  720. }

  721. 

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

  723. {

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

  725.     int cbp = 0;

  726.     uint32_t vlc;

  727.     int8_t *top, *left;

  728.     const int mb_xy = s->mb_xy;

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

  730. 

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

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

  733.     s->topright_samples_available = 0xFFFF;

  734. 

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

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

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

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

  739.                              0, 0, 0, 0, 0, 0);

  740. 

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

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

  743.                                  0, 0, 0, 0, 1, 1);

  744. 

  745.             mb_type = MB_TYPE_SKIP;

  746.         } else {

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

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

  749.                 return -1;

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

  751.                 return -1;

  752. 

  753.             mb_type = MB_TYPE_16x16;

  754.         }

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

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

  757.             mode = THIRDPEL_MODE;

  758.         else if (s->halfpel_flag &&

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

  760.             mode = HALFPEL_MODE;

  761.         else

  762.             mode = FULLPEL_MODE;

  763. 

  764.         /* fill caches */

  765.         /* note ref_cache should contain here:

  766.          *  ????????

  767.          *  ???11111

  768.          *  N??11111

  769.          *  N??11111

  770.          *  N??11111

  771.          */

  772. 

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

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

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

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

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

  778.             } else {

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

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

  781.             }

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

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

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

  785.                        4 * 2 * sizeof(int16_t));

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

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

  788. 

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

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

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

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

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

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

  795.                 } else

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

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

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

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

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

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

  802.                 } else

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

  804.             } else

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

  806.                        PART_NOT_AVAILABLE, 8);

  807. 

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

  809.                 break;

  810.         }

  811. 

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

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

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

  815.                 return -1;

  816.         } else {        /* AV_PICTURE_TYPE_B */

  817.             if (mb_type != 2) {

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

  819.                     return -1;

  820.             } else {

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

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

  823.                            0, 4 * 2 * sizeof(int16_t));

  824.             }

  825.             if (mb_type != 1) {

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

  827.                     return -1;

  828.             } else {

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

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

  831.                            0, 4 * 2 * sizeof(int16_t));

  832.             }

  833.         }

  834. 

  835.         mb_type = MB_TYPE_16x16;

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

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

  838.         int8_t *i4x4_cache = s->intra4x4_pred_mode_cache;

  839. 

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

  841. 

  842.         if (mb_type == 8) {

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

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

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

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

  847.                     s->left_samples_available = 0x5F5F;

  848.             }

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

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

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

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

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

  854. 

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

  856.                     s->top_samples_available = 0x33FF;

  857.             }

  858. 

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

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

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

  862. 

  863.                 if (vlc >= 25U) {

  864.                     av_log(s->avctx, AV_LOG_ERROR,

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

  866.                     return -1;

  867.                 }

  868. 

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

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

  871. 

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

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

  874. 

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

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

  877.                     return -1;

  878.                 }

  879.             }

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

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

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

  883.         }

  884. 

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

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

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

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

  889. 

  890.         if (mb_type == 8) {

  891.             ff_h264_check_intra4x4_pred_mode(s->intra4x4_pred_mode_cache,

  892.                                              s->avctx, s->top_samples_available,

  893.                                              s->left_samples_available);

  894. 

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

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

  897.         } else {

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

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

  900. 

  901.             s->top_samples_available  = 0x33FF;

  902.             s->left_samples_available = 0x5F5F;

  903.         }

  904. 

  905.         mb_type = MB_TYPE_INTRA4x4;

  906.     } else {                      /* INTRA16x16 */

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

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

  909. 

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

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

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

  913.             return s->intra16x16_pred_mode;

  914.         }

  915. 

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

  917.         mb_type = MB_TYPE_INTRA16x16;

  918.     }

  919. 

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

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

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

  923.                    0, 4 * 2 * sizeof(int16_t));

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

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

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

  927.                        0, 4 * 2 * sizeof(int16_t));

  928.         }

  929.     }

  930.     if (!IS_INTRA4x4(mb_type)) {

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

  932.     }

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

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

  935.     }

  936. 

  937.     if (!IS_INTRA16x16(mb_type) &&

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

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

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

  941.             return -1;

  942.         }

  943. 

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

  945.                                 : ff_h264_golomb_to_inter_cbp[vlc];

  946.     }

  947.     if (IS_INTRA16x16(mb_type) ||

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

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

  950. 

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

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

  953.             return -1;

  954.         }

  955.     }

  956.     if (IS_INTRA16x16(mb_type)) {

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

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

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

  960.             av_log(s->avctx, AV_LOG_ERROR,

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

  962.             return -1;

  963.         }

  964.     }

  965. 

  966.     if (cbp) {

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

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

  969. 

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

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

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

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

  974.                                  2 * (j & 2) + 4 * (i & 2))

  975.                               : (4 * i + j);

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

  977. 

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

  979.                         av_log(s->avctx, AV_LOG_ERROR,

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

  981.                         return -1;

  982.                     }

  983.                 }

  984.             }

  985. 

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

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

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

  989.                     av_log(s->avctx, AV_LOG_ERROR,

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

  991.                     return -1;

  992.                 }

  993. 

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

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

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

  997.                         k                                 = 16 * i + j;

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

  999. 

  1000.                         if (svq3_decode_block(&s->gb_slice, &s->mb[16 * k], 1, 1)) {

  1001.                             av_log(s->avctx, AV_LOG_ERROR,

  1002.                                    "error while decoding chroma ac block\n");

  1003.                             return -1;

  1004.                         }

  1005.                     }

  1006.                 }

  1007.             }

  1008.         }

  1009.     }

  1010. 

  1011.     s->cbp                     = cbp;

  1012.     s->cur_pic->mb_type[mb_xy] = mb_type;

  1013. 

  1014.     if (IS_INTRA(mb_type))

  1015.         s->chroma_pred_mode = ff_h264_check_intra_pred_mode(s->avctx, s->top_samples_available,

  1016.                                                             s->left_samples_available, DC_PRED8x8, 1);

  1017. 

  1018.     return 0;

  1019. }

  1020. 

  1021. static int svq3_decode_slice_header(AVCodecContext *avctx)

  1022. {

  1023.     SVQ3Context *s = avctx->priv_data;

  1024.     const int mb_xy   = s->mb_xy;

  1025.     int i, header;

  1026.     unsigned slice_id;

  1027. 

  1028.     header = get_bits(&s->gb, 8);

  1029. 

  1030.     if (((header & 0x9F) != 1 && (header & 0x9F) != 2) || (header & 0x60) == 0) {

  1031.         /* TODO: what? */

  1032.         av_log(avctx, AV_LOG_ERROR, "unsupported slice header (%02X)\n", header);

  1033.         return -1;

  1034.     } else {

  1035.         int slice_bits, slice_bytes, slice_length;

  1036.         int length = header >> 5 & 3;

  1037. 

  1038.         slice_length = show_bits(&s->gb, 8 * length);

  1039.         slice_bits   = slice_length * 8;

  1040.         slice_bytes  = slice_length + length - 1;

  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.         if (slice_bytes * 8LL > get_bits_left(&s->gb)) {

  1049.             av_log(avctx, AV_LOG_ERROR, "slice after bitstream end\n");

  1050.             return AVERROR_INVALIDDATA;

  1051.         }

  1052.         memcpy(s->slice_buf, s->gb.buffer + s->gb.index / 8, slice_bytes);

  1053. 

  1054.         if (s->watermark_key) {

  1055.             uint32_t header = AV_RL32(&s->slice_buf[1]);

  1056.             AV_WL32(&s->slice_buf[1], header ^ s->watermark_key);

  1057.         }

  1058.         init_get_bits(&s->gb_slice, s->slice_buf, slice_bits);

  1059. 

  1060.         if (length > 0) {

  1061.             memmove(s->slice_buf, &s->slice_buf[slice_length], length - 1);

  1062.         }

  1063.         skip_bits_long(&s->gb, slice_bytes * 8);

  1064.     }

  1065. 

  1066.     if ((slice_id = get_interleaved_ue_golomb(&s->gb_slice)) >= 3) {

  1067.         av_log(s->avctx, AV_LOG_ERROR, "illegal slice type %u \n", slice_id);

  1068.         return -1;

  1069.     }

  1070. 

  1071.     s->slice_type = ff_h264_golomb_to_pict_type[slice_id];

  1072. 

  1073.     if ((header & 0x9F) == 2) {

  1074.         i = (s->mb_num < 64) ? 6 : (1 + av_log2(s->mb_num - 1));

  1075.         get_bits(&s->gb_slice, i);

  1076.     } else if (get_bits1(&s->gb_slice)) {

  1077.         avpriv_report_missing_feature(s->avctx, "Media key encryption");

  1078.         return AVERROR_PATCHWELCOME;

  1079.     }

  1080. 

  1081.     s->slice_num      = get_bits(&s->gb_slice, 8);

  1082.     s->qscale         = get_bits(&s->gb_slice, 5);

  1083.     s->adaptive_quant = get_bits1(&s->gb_slice);

  1084. 

  1085.     /* unknown fields */

  1086.     skip_bits1(&s->gb_slice);

  1087. 

  1088.     if (s->has_watermark)

  1089.         skip_bits1(&s->gb_slice);

  1090. 

  1091.     skip_bits1(&s->gb_slice);

  1092.     skip_bits(&s->gb_slice, 2);

  1093. 

  1094.     if (skip_1stop_8data_bits(&s->gb_slice) < 0)

  1095.         return AVERROR_INVALIDDATA;

  1096. 

  1097.     /* reset intra predictors and invalidate motion vector references */

  1098.     if (s->mb_x > 0) {

  1099.         memset(s->intra4x4_pred_mode + s->mb2br_xy[mb_xy - 1] + 3,

  1100.                -1, 4 * sizeof(int8_t));

  1101.         memset(s->intra4x4_pred_mode + s->mb2br_xy[mb_xy - s->mb_x],

  1102.                -1, 8 * sizeof(int8_t) * s->mb_x);

  1103.     }

  1104.     if (s->mb_y > 0) {

  1105.         memset(s->intra4x4_pred_mode + s->mb2br_xy[mb_xy - s->mb_stride],

  1106.                -1, 8 * sizeof(int8_t) * (s->mb_width - s->mb_x));

  1107. 

  1108.         if (s->mb_x > 0)

  1109.             s->intra4x4_pred_mode[s->mb2br_xy[mb_xy - s->mb_stride - 1] + 3] = -1;

  1110.     }

  1111. 

  1112.     return 0;

  1113. }

  1114. 

  1115. static void init_dequant4_coeff_table(SVQ3Context *s)

  1116. {

  1117.     int q, x;

  1118.     const int max_qp = 51;

  1119. 

  1120.     for (q = 0; q < max_qp + 1; q++) {

  1121.         int shift = ff_h264_quant_div6[q] + 2;

  1122.         int idx   = ff_h264_quant_rem6[q];

  1123.         for (x = 0; x < 16; x++)

  1124.             s->dequant4_coeff[q][(x >> 2) | ((x << 2) & 0xF)] =

  1125.                 ((uint32_t)ff_h264_dequant4_coeff_init[idx][(x & 1) + ((x >> 2) & 1)] * 16) << shift;

  1126.     }

  1127. }

  1128. 

  1129. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  1130. {

  1131.     SVQ3Context *s = avctx->priv_data;

  1132.     int m, x, y;

  1133.     unsigned char *extradata;

  1134.     unsigned char *extradata_end;

  1135.     unsigned int size;

  1136.     int marker_found = 0;

  1137.     int ret;

  1138. 

  1139.     s->cur_pic  = &s->frames[0];

  1140.     s->last_pic = &s->frames[1];

  1141.     s->next_pic = &s->frames[2];

  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. 

  1154.     avctx->bits_per_raw_sample = 8;

  1155. 

  1156.     ff_hpeldsp_init(&s->hdsp, avctx->flags);

  1157.     ff_tpeldsp_init(&s->tdsp);

  1158. 

  1159.     avctx->pix_fmt     = AV_PIX_FMT_YUVJ420P;

  1160.     avctx->color_range = AVCOL_RANGE_JPEG;

  1161. 

  1162.     s->avctx         = avctx;

  1163.     s->halfpel_flag  = 1;

  1164.     s->thirdpel_flag = 1;

  1165.     s->has_watermark = 0;

  1166. 

  1167.     /* prowl for the "SEQH" marker in the extradata */

  1168.     extradata     = (unsigned char *)avctx->extradata;

  1169.     extradata_end = avctx->extradata + avctx->extradata_size;

  1170.     if (extradata) {

  1171.         for (m = 0; m + 8 < avctx->extradata_size; m++) {

  1172.             if (!memcmp(extradata, "SEQH", 4)) {

  1173.                 marker_found = 1;

  1174.                 break;

  1175.             }

  1176.             extradata++;

  1177.         }

  1178.     }

  1179. 

  1180.     /* if a match was found, parse the extra data */

  1181.     if (marker_found) {

  1182.         GetBitContext gb;

  1183.         int frame_size_code;

  1184.         int unk0, unk1, unk2, unk3, unk4;

  1185.         int w,h;

  1186. 

  1187.         size = AV_RB32(&extradata[4]);

  1188.         if (size > extradata_end - extradata - 8) {

  1189.             ret = AVERROR_INVALIDDATA;

  1190.             goto fail;

  1191.         }

  1192.         init_get_bits(&gb, extradata + 8, size * 8);

  1193. 

  1194.         /* 'frame size code' and optional 'width, height' */

  1195.         frame_size_code = get_bits(&gb, 3);

  1196.         switch (frame_size_code) {

  1197.         case 0:

  1198.             w = 160;

  1199.             h = 120;

  1200.             break;

  1201.         case 1:

  1202.             w = 128;

  1203.             h =  96;

  1204.             break;

  1205.         case 2:

  1206.             w = 176;

  1207.             h = 144;

  1208.             break;

  1209.         case 3:

  1210.             w = 352;

  1211.             h = 288;

  1212.             break;

  1213.         case 4:

  1214.             w = 704;

  1215.             h = 576;

  1216.             break;

  1217.         case 5:

  1218.             w = 240;

  1219.             h = 180;

  1220.             break;

  1221.         case 6:

  1222.             w = 320;

  1223.             h = 240;

  1224.             break;

  1225.         case 7:

  1226.             w = get_bits(&gb, 12);

  1227.             h = get_bits(&gb, 12);

  1228.             break;

  1229.         }

  1230.         ret = ff_set_dimensions(avctx, w, h);

  1231.         if (ret < 0)

  1232.             goto fail;

  1233. 

  1234.         s->halfpel_flag  = get_bits1(&gb);

  1235.         s->thirdpel_flag = get_bits1(&gb);

  1236. 

  1237.         /* unknown fields */

  1238.         unk0 = get_bits1(&gb);

  1239.         unk1 = get_bits1(&gb);

  1240.         unk2 = get_bits1(&gb);

  1241.         unk3 = get_bits1(&gb);

  1242. 

  1243.         s->low_delay = get_bits1(&gb);

  1244. 

  1245.         /* unknown field */

  1246.         unk4 = get_bits1(&gb);

  1247. 

  1248.         av_log(avctx, AV_LOG_DEBUG, "Unknown fields %d %d %d %d %d\n",

  1249.                unk0, unk1, unk2, unk3, unk4);

  1250. 

  1251.         if (skip_1stop_8data_bits(&gb) < 0) {

  1252.             ret = AVERROR_INVALIDDATA;

  1253.             goto fail;

  1254.         }

  1255. 

  1256.         s->has_watermark  = get_bits1(&gb);

  1257.         avctx->has_b_frames = !s->low_delay;

  1258.         if (s->has_watermark) {

  1259. #if CONFIG_ZLIB

  1260.             unsigned watermark_width  = get_interleaved_ue_golomb(&gb);

  1261.             unsigned watermark_height = get_interleaved_ue_golomb(&gb);

  1262.             int u1                    = get_interleaved_ue_golomb(&gb);

  1263.             int u2                    = get_bits(&gb, 8);

  1264.             int u3                    = get_bits(&gb, 2);

  1265.             int u4                    = get_interleaved_ue_golomb(&gb);

  1266.             unsigned long buf_len     = watermark_width *

  1267.                                         watermark_height * 4;

  1268.             int offset                = get_bits_count(&gb) + 7 >> 3;

  1269.             uint8_t *buf;

  1270. 

  1271.             if (watermark_height <= 0 ||

  1272.                 (uint64_t)watermark_width * 4 > UINT_MAX / watermark_height) {

  1273.                 ret = -1;

  1274.                 goto fail;

  1275.             }

  1276. 

  1277.             buf = av_malloc(buf_len);

  1278.             if (!buf) {

  1279.                 ret = AVERROR(ENOMEM);

  1280.                 goto fail;

  1281.             }

  1282.             av_log(avctx, AV_LOG_DEBUG, "watermark size: %ux%u\n",

  1283.                    watermark_width, watermark_height);

  1284.             av_log(avctx, AV_LOG_DEBUG,

  1285.                    "u1: %x u2: %x u3: %x compressed data size: %d offset: %d\n",

  1286.                    u1, u2, u3, u4, offset);

  1287.             if (uncompress(buf, &buf_len, extradata + 8 + offset,

  1288.                            size - offset) != Z_OK) {

  1289.                 av_log(avctx, AV_LOG_ERROR,

  1290.                        "could not uncompress watermark logo\n");

  1291.                 av_free(buf);

  1292.                 ret = -1;

  1293.                 goto fail;

  1294.             }

  1295.             s->watermark_key = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_CCITT), 0, buf, buf_len));

  1296. 

  1297.             s->watermark_key = s->watermark_key << 16 | s->watermark_key;

  1298.             av_log(avctx, AV_LOG_DEBUG,

  1299.                    "watermark key %#"PRIx32"\n", s->watermark_key);

  1300.             av_free(buf);

  1301. #else

  1302.             av_log(avctx, AV_LOG_ERROR,

  1303.                    "this svq3 file contains watermark which need zlib support compiled in\n");

  1304.             ret = -1;

  1305.             goto fail;

  1306. #endif

  1307.         }

  1308.     }

  1309. 

  1310.     s->mb_width   = (avctx->width + 15) / 16;

  1311.     s->mb_height  = (avctx->height + 15) / 16;

  1312.     s->mb_stride  = s->mb_width + 1;

  1313.     s->mb_num     = s->mb_width * s->mb_height;

  1314.     s->b_stride   = 4 * s->mb_width;

  1315.     s->h_edge_pos = s->mb_width * 16;

  1316.     s->v_edge_pos = s->mb_height * 16;

  1317. 

  1318.     s->intra4x4_pred_mode = av_mallocz(s->mb_stride * 2 * 8);

  1319.     if (!s->intra4x4_pred_mode)

  1320.         return AVERROR(ENOMEM);

  1321. 

  1322.     s->mb2br_xy = av_mallocz(s->mb_stride * (s->mb_height + 1) *

  1323.                              sizeof(*s->mb2br_xy));

  1324.     if (!s->mb2br_xy)

  1325.         return AVERROR(ENOMEM);

  1326. 

  1327.     for (y = 0; y < s->mb_height; y++)

  1328.         for (x = 0; x < s->mb_width; x++) {

  1329.             const int mb_xy = x + y * s->mb_stride;

  1330. 

  1331.             s->mb2br_xy[mb_xy] = 8 * (mb_xy % (2 * s->mb_stride));

  1332.         }

  1333. 

  1334.     init_dequant4_coeff_table(s);

  1335. 

  1336.     return 0;

  1337. fail:

  1338.     svq3_decode_end(avctx);

  1339.     return ret;

  1340. }

  1341. 

  1342. static void free_picture(AVCodecContext *avctx, SVQ3Frame *pic)

  1343. {

  1344.     int i;

  1345.     for (i = 0; i < 2; i++) {

  1346.         av_buffer_unref(&pic->motion_val_buf[i]);

  1347.         av_buffer_unref(&pic->ref_index_buf[i]);

  1348.     }

  1349.     av_buffer_unref(&pic->mb_type_buf);

  1350. 

  1351.     av_frame_unref(pic->f);

  1352. }

  1353. 

  1354. static int get_buffer(AVCodecContext *avctx, SVQ3Frame *pic)

  1355. {

  1356.     SVQ3Context *s = avctx->priv_data;

  1357.     const int big_mb_num    = s->mb_stride * (s->mb_height + 1) + 1;

  1358.     const int mb_array_size = s->mb_stride * s->mb_height;

  1359.     const int b4_stride     = s->mb_width * 4 + 1;

  1360.     const int b4_array_size = b4_stride * s->mb_height * 4;

  1361.     int ret;

  1362. 

  1363.     if (!pic->motion_val_buf[0]) {

  1364.         int i;

  1365. 

  1366.         pic->mb_type_buf = av_buffer_allocz((big_mb_num + s->mb_stride) * sizeof(uint32_t));

  1367.         if (!pic->mb_type_buf)

  1368.             return AVERROR(ENOMEM);

  1369.         pic->mb_type = (uint32_t*)pic->mb_type_buf->data + 2 * s->mb_stride + 1;

  1370. 

  1371.         for (i = 0; i < 2; i++) {

  1372.             pic->motion_val_buf[i] = av_buffer_allocz(2 * (b4_array_size + 4) * sizeof(int16_t));

  1373.             pic->ref_index_buf[i]  = av_buffer_allocz(4 * mb_array_size);

  1374.             if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i]) {

  1375.                 ret = AVERROR(ENOMEM);

  1376.                 goto fail;

  1377.             }

  1378. 

  1379.             pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;

  1380.             pic->ref_index[i]  = pic->ref_index_buf[i]->data;

  1381.         }

  1382.     }

  1383. 

  1384.     ret = ff_get_buffer(avctx, pic->f,

  1385.                         (s->pict_type != AV_PICTURE_TYPE_B) ?

  1386.                          AV_GET_BUFFER_FLAG_REF : 0);

  1387.     if (ret < 0)

  1388.         goto fail;

  1389. 

  1390.     if (!s->edge_emu_buffer) {

  1391.         s->edge_emu_buffer = av_mallocz_array(pic->f->linesize[0], 17);

  1392.         if (!s->edge_emu_buffer)

  1393.             return AVERROR(ENOMEM);

  1394.     }

  1395. 

  1396.     return 0;

  1397. fail:

  1398.     free_picture(avctx, pic);

  1399.     return ret;

  1400. }

  1401. 

  1402. static int svq3_decode_frame(AVCodecContext *avctx, void *data,

  1403.                              int *got_frame, AVPacket *avpkt)

  1404. {

  1405.     SVQ3Context *s     = avctx->priv_data;

  1406.     int buf_size       = avpkt->size;

  1407.     int left;

  1408.     uint8_t *buf;

  1409.     int ret, m, i;

  1410. 

  1411.     /* special case for last picture */

  1412.     if (buf_size == 0) {

  1413.         if (s->next_pic->f->data[0] && !s->low_delay && !s->last_frame_output) {

  1414.             ret = av_frame_ref(data, s->next_pic->f);

  1415.             if (ret < 0)

  1416.                 return ret;

  1417.             s->last_frame_output = 1;

  1418.             *got_frame          = 1;

  1419.         }

  1420.         return 0;

  1421.     }

  1422. 

  1423.     s->mb_x = s->mb_y = s->mb_xy = 0;

  1424. 

  1425.     if (s->watermark_key) {

  1426.         av_fast_padded_malloc(&s->buf, &s->buf_size, buf_size);

  1427.         if (!s->buf)

  1428.             return AVERROR(ENOMEM);

  1429.         memcpy(s->buf, avpkt->data, buf_size);

  1430.         buf = s->buf;

  1431.     } else {

  1432.         buf = avpkt->data;

  1433.     }

  1434. 

  1435.     ret = init_get_bits(&s->gb, buf, 8 * buf_size);

  1436.     if (ret < 0)

  1437.         return ret;

  1438. 

  1439.     if (svq3_decode_slice_header(avctx))

  1440.         return -1;

  1441. 

  1442.     s->pict_type = s->slice_type;

  1443. 

  1444.     if (s->pict_type != AV_PICTURE_TYPE_B)

  1445.         FFSWAP(SVQ3Frame*, s->next_pic, s->last_pic);

  1446. 

  1447.     av_frame_unref(s->cur_pic->f);

  1448. 

  1449.     /* for skipping the frame */

  1450.     s->cur_pic->f->pict_type = s->pict_type;

  1451.     s->cur_pic->f->key_frame = (s->pict_type == AV_PICTURE_TYPE_I);

  1452. 

  1453.     ret = get_buffer(avctx, s->cur_pic);

  1454.     if (ret < 0)

  1455.         return ret;

  1456. 

  1457.     for (i = 0; i < 16; i++) {

  1458.         s->block_offset[i]           = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * s->cur_pic->f->linesize[0] * ((scan8[i] - scan8[0]) >> 3);

  1459.         s->block_offset[48 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * s->cur_pic->f->linesize[0] * ((scan8[i] - scan8[0]) >> 3);

  1460.     }

  1461.     for (i = 0; i < 16; i++) {

  1462.         s->block_offset[16 + i]      =

  1463.         s->block_offset[32 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * s->cur_pic->f->linesize[1] * ((scan8[i] - scan8[0]) >> 3);

  1464.         s->block_offset[48 + 16 + i] =

  1465.         s->block_offset[48 + 32 + i] = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * s->cur_pic->f->linesize[1] * ((scan8[i] - scan8[0]) >> 3);

  1466.     }

  1467. 

  1468.     if (s->pict_type != AV_PICTURE_TYPE_I) {

  1469.         if (!s->last_pic->f->data[0]) {

  1470.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1471.             av_frame_unref(s->last_pic->f);

  1472.             ret = get_buffer(avctx, s->last_pic);

  1473.             if (ret < 0)

  1474.                 return ret;

  1475.             memset(s->last_pic->f->data[0], 0, avctx->height * s->last_pic->f->linesize[0]);

  1476.             memset(s->last_pic->f->data[1], 0x80, (avctx->height / 2) *

  1477.                    s->last_pic->f->linesize[1]);

  1478.             memset(s->last_pic->f->data[2], 0x80, (avctx->height / 2) *

  1479.                    s->last_pic->f->linesize[2]);

  1480.         }

  1481. 

  1482.         if (s->pict_type == AV_PICTURE_TYPE_B && !s->next_pic->f->data[0]) {

  1483.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1484.             av_frame_unref(s->next_pic->f);

  1485.             ret = get_buffer(avctx, s->next_pic);

  1486.             if (ret < 0)

  1487.                 return ret;

  1488.             memset(s->next_pic->f->data[0], 0, avctx->height * s->next_pic->f->linesize[0]);

  1489.             memset(s->next_pic->f->data[1], 0x80, (avctx->height / 2) *

  1490.                    s->next_pic->f->linesize[1]);

  1491.             memset(s->next_pic->f->data[2], 0x80, (avctx->height / 2) *

  1492.                    s->next_pic->f->linesize[2]);

  1493.         }

  1494.     }

  1495. 

  1496.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  1497.         av_log(s->avctx, AV_LOG_DEBUG,

  1498.                "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n",

  1499.                av_get_picture_type_char(s->pict_type),

  1500.                s->halfpel_flag, s->thirdpel_flag,

  1501.                s->adaptive_quant, s->qscale, s->slice_num);

  1502. 

  1503.     if (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B ||

  1504.         avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I ||

  1505.         avctx->skip_frame >= AVDISCARD_ALL)

  1506.         return 0;

  1507. 

  1508.     if (s->next_p_frame_damaged) {

  1509.         if (s->pict_type == AV_PICTURE_TYPE_B)

  1510.             return 0;

  1511.         else

  1512.             s->next_p_frame_damaged = 0;

  1513.     }

  1514. 

  1515.     if (s->pict_type == AV_PICTURE_TYPE_B) {

  1516.         s->frame_num_offset = s->slice_num - s->prev_frame_num;

  1517. 

  1518.         if (s->frame_num_offset < 0)

  1519.             s->frame_num_offset += 256;

  1520.         if (s->frame_num_offset == 0 ||

  1521.             s->frame_num_offset >= s->prev_frame_num_offset) {

  1522.             av_log(s->avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  1523.             return -1;

  1524.         }

  1525.     } else {

  1526.         s->prev_frame_num        = s->frame_num;

  1527.         s->frame_num             = s->slice_num;

  1528.         s->prev_frame_num_offset = s->frame_num - s->prev_frame_num;

  1529. 

  1530.         if (s->prev_frame_num_offset < 0)

  1531.             s->prev_frame_num_offset += 256;

  1532.     }

  1533. 

  1534.     for (m = 0; m < 2; m++) {

  1535.         int i;

  1536.         for (i = 0; i < 4; i++) {

  1537.             int j;

  1538.             for (j = -1; j < 4; j++)

  1539.                 s->ref_cache[m][scan8[0] + 8 * i + j] = 1;

  1540.             if (i < 3)

  1541.                 s->ref_cache[m][scan8[0] + 8 * i + j] = PART_NOT_AVAILABLE;

  1542.         }

  1543.     }

  1544. 

  1545.     for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  1546.         for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  1547.             unsigned mb_type;

  1548.             s->mb_xy = s->mb_x + s->mb_y * s->mb_stride;

  1549. 

  1550.             if ((get_bits_left(&s->gb_slice)) <= 7) {

  1551.                 if (((get_bits_count(&s->gb_slice) & 7) == 0 ||

  1552.                     show_bits(&s->gb_slice, get_bits_left(&s->gb_slice) & 7) == 0)) {

  1553. 

  1554.                     if (svq3_decode_slice_header(avctx))

  1555.                         return -1;

  1556.                 }

  1557.                 if (s->slice_type != s->pict_type) {

  1558.                     avpriv_request_sample(avctx, "non constant slice type");

  1559.                 }

  1560.                 /* TODO: support s->mb_skip_run */

  1561.             }

  1562. 

  1563.             mb_type = get_interleaved_ue_golomb(&s->gb_slice);

  1564. 

  1565.             if (s->pict_type == AV_PICTURE_TYPE_I)

  1566.                 mb_type += 8;

  1567.             else if (s->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4)

  1568.                 mb_type += 4;

  1569.             if (mb_type > 33 || svq3_decode_mb(s, mb_type)) {

  1570.                 av_log(s->avctx, AV_LOG_ERROR,

  1571.                        "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1572.                 return -1;

  1573.             }

  1574. 

  1575.             if (mb_type != 0 || s->cbp)

  1576.                 hl_decode_mb(s);

  1577. 

  1578.             if (s->pict_type != AV_PICTURE_TYPE_B && !s->low_delay)

  1579.                 s->cur_pic->mb_type[s->mb_x + s->mb_y * s->mb_stride] =

  1580.                     (s->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1581.         }

  1582. 

  1583.         ff_draw_horiz_band(avctx, s->cur_pic->f,

  1584.                            s->last_pic->f->data[0] ? s->last_pic->f : NULL,

  1585.                            16 * s->mb_y, 16, PICT_FRAME, 0,

  1586.                            s->low_delay);

  1587.     }

  1588. 

  1589.     left = buf_size*8 - get_bits_count(&s->gb_slice);

  1590. 

  1591.     if (s->mb_y != s->mb_height || s->mb_x != s->mb_width) {

  1592.         av_log(avctx, AV_LOG_INFO, "frame num %d incomplete pic x %d y %d left %d\n", avctx->frame_number, s->mb_y, s->mb_x, left);

  1593.         //av_hex_dump(stderr, buf+buf_size-8, 8);

  1594.     }

  1595. 

  1596.     if (left < 0) {

  1597.         av_log(avctx, AV_LOG_ERROR, "frame num %d left %d\n", avctx->frame_number, left);

  1598.         return -1;

  1599.     }

  1600. 

  1601.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay)

  1602.         ret = av_frame_ref(data, s->cur_pic->f);

  1603.     else if (s->last_pic->f->data[0])

  1604.         ret = av_frame_ref(data, s->last_pic->f);

  1605.     if (ret < 0)

  1606.         return ret;

  1607. 

  1608.     /* Do not output the last pic after seeking. */

  1609.     if (s->last_pic->f->data[0] || s->low_delay)

  1610.         *got_frame = 1;

  1611. 

  1612.     if (s->pict_type != AV_PICTURE_TYPE_B) {

  1613.         FFSWAP(SVQ3Frame*, s->cur_pic, s->next_pic);

  1614.     } else {

  1615.         av_frame_unref(s->cur_pic->f);

  1616.     }

  1617. 

  1618.     return buf_size;

  1619. }

  1620. 

  1621. static av_cold int svq3_decode_end(AVCodecContext *avctx)

  1622. {

  1623.     SVQ3Context *s = avctx->priv_data;

  1624. 

  1625.     free_picture(avctx, s->cur_pic);

  1626.     free_picture(avctx, s->next_pic);

  1627.     free_picture(avctx, s->last_pic);

  1628.     av_frame_free(&s->cur_pic->f);

  1629.     av_frame_free(&s->next_pic->f);

  1630.     av_frame_free(&s->last_pic->f);

  1631.     av_freep(&s->slice_buf);

  1632.     av_freep(&s->intra4x4_pred_mode);

  1633.     av_freep(&s->edge_emu_buffer);

  1634.     av_freep(&s->mb2br_xy);

  1635. 

  1636. 

  1637.     av_freep(&s->buf);

  1638.     s->buf_size = 0;

  1639. 

  1640.     return 0;

  1641. }

  1642. 

  1643. AVCodec ff_svq3_decoder = {

  1644.     .name           = "svq3",

  1645.     .long_name      = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1646.     .type           = AVMEDIA_TYPE_VIDEO,

  1647.     .id             = AV_CODEC_ID_SVQ3,

  1648.     .priv_data_size = sizeof(SVQ3Context),

  1649.     .init           = svq3_decode_init,

  1650.     .close          = svq3_decode_end,

  1651.     .decode         = svq3_decode_frame,

  1652.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND |

  1653.                       AV_CODEC_CAP_DR1             |

  1654.                       AV_CODEC_CAP_DELAY,

  1655.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P,

  1656.                                                      AV_PIX_FMT_NONE},

  1657. };