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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. 

  47. #include "bitstream.h"

  48. #include "golomb.h"

  49. #include "internal.h"

  50. #include "avcodec.h"

  51. #include "mpegutils.h"

  52. #include "h264dec.h"

  53. #include "h264data.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.     BitstreamContext bc;

  97.     BitstreamContext bc_slice;

  98.     uint8_t *slice_buf;

  99.     int slice_size;

  100.     int halfpel_flag;

  101.     int thirdpel_flag;

  102.     int unknown_flag;

  103.     uint32_t watermark_key;

  104.     int adaptive_quant;

  105.     int next_p_frame_damaged;

  106.     int h_edge_pos;

  107.     int v_edge_pos;

  108.     int last_frame_output;

  109.     int slice_num;

  110.     int qscale;

  111.     int cbp;

  112.     int frame_num;

  113.     int frame_num_offset;

  114.     int prev_frame_num_offset;

  115.     int prev_frame_num;

  116. 

  117.     enum AVPictureType pict_type;

  118.     int low_delay;

  119. 

  120.     int mb_x, mb_y;

  121.     int mb_xy;

  122.     int mb_width, mb_height;

  123.     int mb_stride, mb_num;

  124.     int b_stride;

  125. 

  126.     uint32_t *mb2br_xy;

  127. 

  128.     int chroma_pred_mode;

  129.     int intra16x16_pred_mode;

  130. 

  131.     int8_t   intra4x4_pred_mode_cache[5 * 8];

  132.     int8_t (*intra4x4_pred_mode);

  133. 

  134.     unsigned int top_samples_available;

  135.     unsigned int topright_samples_available;

  136.     unsigned int left_samples_available;

  137. 

  138.     uint8_t *edge_emu_buffer;

  139. 

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

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

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

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

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

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

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

  147. } SVQ3Context;

  148. 

  149. #define FULLPEL_MODE  1

  150. #define HALFPEL_MODE  2

  151. #define THIRDPEL_MODE 3

  152. #define PREDICT_MODE  4

  153. 

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

  155.  * o-->o-->o   o

  156.  *         |  /|

  157.  * o   o   o / o

  158.  * | / |   |/  |

  159.  * o   o   o   o

  160.  *   /

  161.  * o-->o-->o-->o

  162.  */

  163. static const uint8_t svq3_scan[16] = {

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

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

  166.     0 + 1 * 4, 0 + 2 * 4, 1 + 1 * 4, 1 + 2 * 4,

  167.     0 + 3 * 4, 1 + 3 * 4, 2 + 3 * 4, 3 + 3 * 4,

  168. };

  169. 

  170. static const uint8_t luma_dc_zigzag_scan[16] = {

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

  172.     3 * 16 + 0 * 64, 0 * 16 + 1 * 64, 1 * 16 + 1 * 64, 2 * 16 + 1 * 64,

  173.     1 * 16 + 2 * 64, 2 * 16 + 2 * 64, 3 * 16 + 2 * 64, 0 * 16 + 3 * 64,

  174.     3 * 16 + 1 * 64, 1 * 16 + 3 * 64, 2 * 16 + 3 * 64, 3 * 16 + 3 * 64,

  175. };

  176. 

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

  178.     { 0, 0 },

  179.     { 1, 0 }, { 0, 1 },

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

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

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

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

  184.     { 2, 4 }, { 3, 3 }, { 4, 2 },

  185.     { 4, 3 }, { 3, 4 },

  186.     { 4, 4 }

  187. };

  188. 

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

  190.     { { 2, -1, -1, -1, -1 }, { 2, 1, -1, -1, -1 }, { 1, 2, -1, -1, -1 },

  191.       { 2,  1, -1, -1, -1 }, { 1, 2, -1, -1, -1 }, { 1, 2, -1, -1, -1 } },

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

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

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

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

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

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

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

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

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

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

  202. };

  203. 

  204. static const struct {

  205.     uint8_t run;

  206.     uint8_t level;

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

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

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

  210.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  211.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  212. };

  213. 

  214. static const uint32_t svq3_dequant_coeff[32] = {

  215.      3881,  4351,  4890,  5481,   6154,   6914,   7761,   8718,

  216.      9781, 10987, 12339, 13828,  15523,  17435,  19561,  21873,

  217.     24552, 27656, 30847, 34870,  38807,  43747,  49103,  54683,

  218.     61694, 68745, 77615, 89113, 100253, 109366, 126635, 141533

  219. };

  220. 

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

  222. {

  223.     const int qmul = svq3_dequant_coeff[qp];

  224. #define stride 16

  225.     int i;

  226.     int temp[16];

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

  228. 

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

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

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

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

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

  234. 

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

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

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

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

  239.     }

  240. 

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

  242.         const int offset = x_offset[i];

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

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

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

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

  247. 

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

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

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

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

  252.     }

  253. }

  254. #undef stride

  255. 

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

  257.                             int stride, int qp, int dc)

  258. {

  259.     const int qmul = svq3_dequant_coeff[qp];

  260.     int i;

  261. 

  262.     if (dc) {

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

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

  265.         block[0] = 0;

  266.     }

  267. 

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

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

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

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

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

  273. 

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

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

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

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

  278.     }

  279. 

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

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

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

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

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

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

  286. 

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

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

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

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

  291.     }

  292. 

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

  294. }

  295. 

  296. static inline int svq3_decode_block(BitstreamContext *bc, int16_t *block,

  297.                                     int index, const int type)

  298. {

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

  300.         luma_dc_zigzag_scan, ff_zigzag_scan, svq3_scan, ff_h264_chroma_dc_scan

  301.     };

  302. 

  303.     int run, level, limit;

  304.     unsigned vlc;

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

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

  307. 

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

  309.         for (; (vlc = get_interleaved_ue_golomb(bc)) != 0; index++) {

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

  311.             vlc      = vlc + 1 >> 1;

  312. 

  313.             if (type == 3) {

  314.                 if (vlc < 3) {

  315.                     run   = 0;

  316.                     level = vlc;

  317.                 } else if (vlc < 4) {

  318.                     run   = 1;

  319.                     level = 1;

  320.                 } else {

  321.                     run   = vlc & 0x3;

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

  323.                 }

  324.             } else {

  325.                 if (vlc < 16) {

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

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

  328.                 } else if (intra) {

  329.                     run   = vlc & 0x7;

  330.                     level = (vlc >> 3) +

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

  332.                 } else {

  333.                     run   = vlc & 0xF;

  334.                     level = (vlc >> 4) +

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

  336.                 }

  337.             }

  338. 

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

  340.                 return -1;

  341. 

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

  343.         }

  344. 

  345.         if (type != 2) {

  346.             break;

  347.         }

  348.     }

  349. 

  350.     return 0;

  351. }

  352. 

  353. static av_always_inline int

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

  355.                        int i, int list, int part_width)

  356. {

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

  358. 

  359.     if (topright_ref != PART_NOT_AVAILABLE) {

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

  361.         return topright_ref;

  362.     } else {

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

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

  365.     }

  366. }

  367. 

  368. /**

  369.  * Get the predicted MV.

  370.  * @param n the block index

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

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

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

  374.  */

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

  376.                                               int part_width, int list,

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

  378. {

  379.     const int index8       = scan8[n];

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

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

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

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

  384.     const int16_t *C;

  385.     int diagonal_ref, match_count;

  386. 

  387. /* mv_cache

  388.  * B . . A T T T T

  389.  * U . . L . . , .

  390.  * U . . L . . . .

  391.  * U . . L . . , .

  392.  * . . . L . . . .

  393.  */

  394. 

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

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

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

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

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

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

  401.         if (left_ref == ref) {

  402.             *mx = A[0];

  403.             *my = A[1];

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

  405.             *mx = B[0];

  406.             *my = B[1];

  407.         } else {

  408.             *mx = C[0];

  409.             *my = C[1];

  410.         }

  411.     } else {

  412.         if (top_ref      == PART_NOT_AVAILABLE &&

  413.             diagonal_ref == PART_NOT_AVAILABLE &&

  414.             left_ref     != PART_NOT_AVAILABLE) {

  415.             *mx = A[0];

  416.             *my = A[1];

  417.         } else {

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

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

  420.         }

  421.     }

  422. }

  423. 

  424. static inline void svq3_mc_dir_part(SVQ3Context *s,

  425.                                     int x, int y, int width, int height,

  426.                                     int mx, int my, int dxy,

  427.                                     int thirdpel, int dir, int avg)

  428. {

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

  430.     uint8_t *src, *dest;

  431.     int i, emu = 0;

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

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

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

  435. 

  436.     mx += x;

  437.     my += y;

  438. 

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

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

  441.         emu = 1;

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

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

  444.     }

  445. 

  446.     /* form component predictions */

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

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

  449. 

  450.     if (emu) {

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

  452.                                  linesize, linesize,

  453.                                  width + 1, height + 1,

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

  455.         src = s->edge_emu_buffer;

  456.     }

  457.     if (thirdpel)

  458.         (avg ? s->tdsp.avg_tpel_pixels_tab

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

  460.                                                  width, height);

  461.     else

  462.         (avg ? s->hdsp.avg_pixels_tab

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

  464.                                                        height);

  465. 

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

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

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

  469.         width  = width  >> 1;

  470.         height = height >> 1;

  471.         blocksize++;

  472. 

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

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

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

  476. 

  477.             if (emu) {

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

  479.                                          uvlinesize, uvlinesize,

  480.                                          width + 1, height + 1,

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

  482.                                          s->v_edge_pos >> 1);

  483.                 src = s->edge_emu_buffer;

  484.             }

  485.             if (thirdpel)

  486.                 (avg ? s->tdsp.avg_tpel_pixels_tab

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

  488.                                                          uvlinesize,

  489.                                                          width, height);

  490.             else

  491.                 (avg ? s->hdsp.avg_pixels_tab

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

  493.                                                                uvlinesize,

  494.                                                                height);

  495.         }

  496.     }

  497. }

  498. 

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

  500.                               int dir, int avg)

  501. {

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

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

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

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

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

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

  508. 

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

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

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

  512.                              (4 * s->mb_y + (i >> 2)) * s->b_stride;

  513.             int dxy;

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

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

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

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

  518. 

  519.             if (mode != PREDICT_MODE) {

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

  521.             } else {

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

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

  524. 

  525.                 if (dir == 0) {

  526.                     mx = mx * s->frame_num_offset /

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

  528.                     my = my * s->frame_num_offset /

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

  530.                 } else {

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

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

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

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

  535.                 }

  536.             }

  537. 

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

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

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

  541. 

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

  543.             if (mode == PREDICT_MODE) {

  544.                 dx = dy = 0;

  545.             } else {

  546.                 dy = get_interleaved_se_golomb(&s->bc_slice);

  547.                 dx = get_interleaved_se_golomb(&s->bc_slice);

  548. 

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

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

  551.                     return -1;

  552.                 }

  553.             }

  554. 

  555.             /* compute motion vector */

  556.             if (mode == THIRDPEL_MODE) {

  557.                 int fx, fy;

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

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

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

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

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

  563. 

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

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

  566.                 mx += mx;

  567.                 my += my;

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

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

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

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

  572. 

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

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

  575.                 mx *= 3;

  576.                 my *= 3;

  577.             } else {

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

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

  580. 

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

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

  583.                 mx *= 6;

  584.                 my *= 6;

  585.             }

  586. 

  587.             /* update mv_cache */

  588.             if (mode != PREDICT_MODE) {

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

  590. 

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

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

  593. 

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

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

  596.                 }

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

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

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

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

  601.             }

  602. 

  603.             /* write back motion vectors */

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

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

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

  607.         }

  608. 

  609.     return 0;

  610. }

  611. 

  612. static av_always_inline void hl_decode_mb_idct_luma(SVQ3Context *s,

  613.                                                     int mb_type, const int *block_offset,

  614.                                                     int linesize, uint8_t *dest_y)

  615. {

  616.     int i;

  617.     if (!IS_INTRA4x4(mb_type)) {

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

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

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

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

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

  623.             }

  624.     }

  625. }

  626. 

  627. static av_always_inline void hl_decode_mb_predict_luma(SVQ3Context *s,

  628.                                                        int mb_type,

  629.                                                        const int *block_offset,

  630.                                                        int linesize,

  631.                                                        uint8_t *dest_y)

  632. {

  633.     int i;

  634.     int qscale = s->qscale;

  635. 

  636.     if (IS_INTRA4x4(mb_type)) {

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

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

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

  640. 

  641.             uint8_t *topright;

  642.             int nnz, tr;

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

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

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

  646.                 if (!topright_avail) {

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

  648.                     topright = (uint8_t *)&tr;

  649.                 } else

  650.                     topright = ptr + 4 - linesize;

  651.             } else

  652.                 topright = NULL;

  653. 

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

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

  656.             if (nnz) {

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

  658.             }

  659.         }

  660.     } else {

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

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

  663.     }

  664. }

  665. 

  666. static void hl_decode_mb(SVQ3Context *s)

  667. {

  668.     const int mb_x    = s->mb_x;

  669.     const int mb_y    = s->mb_y;

  670.     const int mb_xy   = s->mb_xy;

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

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

  673.     int linesize, uvlinesize;

  674.     int i, j;

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

  676.     const int block_h   = 16 >> 1;

  677. 

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

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

  680. 

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

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

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

  684. 

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

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

  687. 

  688.     if (IS_INTRA(mb_type)) {

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

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

  691. 

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

  693.     }

  694. 

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

  696. 

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

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

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

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

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

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

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

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

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

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

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

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

  709.                 }

  710.         }

  711.     }

  712. }

  713. 

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

  715. {

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

  717.     int cbp = 0;

  718.     uint32_t vlc;

  719.     int8_t *top, *left;

  720.     const int mb_xy = s->mb_xy;

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

  722. 

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

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

  725.     s->topright_samples_available = 0xFFFF;

  726. 

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

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

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

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

  731.                              0, 0, 0, 0, 0, 0);

  732. 

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

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

  735.                                  0, 0, 0, 0, 1, 1);

  736. 

  737.             mb_type = MB_TYPE_SKIP;

  738.         } else {

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

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

  741.                 return -1;

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

  743.                 return -1;

  744. 

  745.             mb_type = MB_TYPE_16x16;

  746.         }

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

  748.         if (s->thirdpel_flag && s->halfpel_flag == !bitstream_read_bit(&s->bc_slice))

  749.             mode = THIRDPEL_MODE;

  750.         else if (s->halfpel_flag &&

  751.                  s->thirdpel_flag == !bitstream_read_bit(&s->bc_slice))

  752.             mode = HALFPEL_MODE;

  753.         else

  754.             mode = FULLPEL_MODE;

  755. 

  756.         /* fill caches */

  757.         /* note ref_cache should contain here:

  758.          *  ????????

  759.          *  ???11111

  760.          *  N??11111

  761.          *  N??11111

  762.          *  N??11111

  763.          */

  764. 

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

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

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

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

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

  770.             } else {

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

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

  773.             }

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

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

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

  777.                        4 * 2 * sizeof(int16_t));

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

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

  780. 

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

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

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

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

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

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

  787.                 } else

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

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

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

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

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

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

  794.                 } else

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

  796.             } else

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

  798.                        PART_NOT_AVAILABLE, 8);

  799. 

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

  801.                 break;

  802.         }

  803. 

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

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

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

  807.                 return -1;

  808.         } else {        /* AV_PICTURE_TYPE_B */

  809.             if (mb_type != 2) {

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

  811.                     return -1;

  812.             } else {

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

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

  815.                            0, 4 * 2 * sizeof(int16_t));

  816.             }

  817.             if (mb_type != 1) {

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

  819.                     return -1;

  820.             } else {

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

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

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

  824.             }

  825.         }

  826. 

  827.         mb_type = MB_TYPE_16x16;

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

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

  830.         int8_t *i4x4_cache = s->intra4x4_pred_mode_cache;

  831. 

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

  833. 

  834.         if (mb_type == 8) {

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

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

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

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

  839.                     s->left_samples_available = 0x5F5F;

  840.             }

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

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

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

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

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

  846. 

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

  848.                     s->top_samples_available = 0x33FF;

  849.             }

  850. 

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

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

  853.                 vlc = get_interleaved_ue_golomb(&s->bc_slice);

  854. 

  855.                 if (vlc >= 25) {

  856.                     av_log(s->avctx, AV_LOG_ERROR,

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

  858.                     return -1;

  859.                 }

  860. 

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

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

  863. 

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

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

  866. 

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

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

  869.                     return -1;

  870.                 }

  871.             }

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

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

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

  875.         }

  876. 

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

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

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

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

  881. 

  882.         if (mb_type == 8) {

  883.             ff_h264_check_intra4x4_pred_mode(s->intra4x4_pred_mode_cache,

  884.                                              s->avctx, s->top_samples_available,

  885.                                              s->left_samples_available);

  886. 

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

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

  889.         } else {

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

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

  892. 

  893.             s->top_samples_available  = 0x33FF;

  894.             s->left_samples_available = 0x5F5F;

  895.         }

  896. 

  897.         mb_type = MB_TYPE_INTRA4x4;

  898.     } else {                      /* INTRA16x16 */

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

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

  901. 

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

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

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

  905.             return s->intra16x16_pred_mode;

  906.         }

  907. 

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

  909.         mb_type = MB_TYPE_INTRA16x16;

  910.     }

  911. 

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

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

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

  915.                    0, 4 * 2 * sizeof(int16_t));

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

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

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

  919.                        0, 4 * 2 * sizeof(int16_t));

  920.         }

  921.     }

  922.     if (!IS_INTRA4x4(mb_type)) {

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

  924.     }

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

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

  927.     }

  928. 

  929.     if (!IS_INTRA16x16(mb_type) &&

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

  931.         if ((vlc = get_interleaved_ue_golomb(&s->bc_slice)) >= 48) {

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

  933.             return -1;

  934.         }

  935. 

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

  937.                                 : ff_h264_golomb_to_inter_cbp[vlc];

  938.     }

  939.     if (IS_INTRA16x16(mb_type) ||

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

  941.         s->qscale += get_interleaved_se_golomb(&s->bc_slice);

  942. 

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

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

  945.             return -1;

  946.         }

  947.     }

  948.     if (IS_INTRA16x16(mb_type)) {

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

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

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

  952.             av_log(s->avctx, AV_LOG_ERROR,

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

  954.             return -1;

  955.         }

  956.     }

  957. 

  958.     if (cbp) {

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

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

  961. 

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

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

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

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

  966.                                  2 * (j & 2) + 4 * (i & 2))

  967.                               : (4 * i + j);

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

  969. 

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

  971.                         av_log(s->avctx, AV_LOG_ERROR,

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

  973.                         return -1;

  974.                     }

  975.                 }

  976.             }

  977. 

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

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

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

  981.                     av_log(s->avctx, AV_LOG_ERROR,

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

  983.                     return -1;

  984.                 }

  985. 

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

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

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

  989.                         k                                 = 16 * i + j;

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

  991. 

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

  993.                             av_log(s->avctx, AV_LOG_ERROR,

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

  995.                             return -1;

  996.                         }

  997.                     }

  998.                 }

  999.             }

  1000.         }

  1001.     }

  1002. 

  1003.     s->cbp                     = cbp;

  1004.     s->cur_pic->mb_type[mb_xy] = mb_type;

  1005. 

  1006.     if (IS_INTRA(mb_type))

  1007.         s->chroma_pred_mode = ff_h264_check_intra_pred_mode(s->avctx, s->top_samples_available,

  1008.                                                             s->left_samples_available, DC_PRED8x8, 1);

  1009. 

  1010.     return 0;

  1011. }

  1012. 

  1013. static int svq3_decode_slice_header(AVCodecContext *avctx)

  1014. {

  1015.     SVQ3Context *s = avctx->priv_data;

  1016.     const int mb_xy   = s->mb_xy;

  1017.     int i, header;

  1018.     unsigned slice_id;

  1019. 

  1020.     header = bitstream_read(&s->bc, 8);

  1021. 

  1022.     if (((header & 0x9F) != 1 && (header & 0x9F) != 2) || (header & 0x60) == 0) {

  1023.         /* TODO: what? */

  1024.         av_log(avctx, AV_LOG_ERROR, "unsupported slice header (%02X)\n", header);

  1025.         return -1;

  1026.     } else {

  1027.         int slice_bits, slice_bytes, slice_length;

  1028.         int length = header >> 5 & 3;

  1029. 

  1030.         slice_length = bitstream_peek(&s->bc, 8 * length);

  1031.         slice_bits   = slice_length * 8;

  1032.         slice_bytes  = slice_length + length - 1;

  1033. 

  1034.         bitstream_skip(&s->bc, 8);

  1035. 

  1036.         av_fast_malloc(&s->slice_buf, &s->slice_size, slice_bytes + AV_INPUT_BUFFER_PADDING_SIZE);

  1037.         if (!s->slice_buf)

  1038.             return AVERROR(ENOMEM);

  1039. 

  1040.         if (slice_bytes * 8 > bitstream_bits_left(&s->bc)) {

  1041.             av_log(avctx, AV_LOG_ERROR, "slice after bitstream end\n");

  1042.             return AVERROR_INVALIDDATA;

  1043.         }

  1044.         memcpy(s->slice_buf, s->bc.buffer + bitstream_tell(&s->bc) / 8, slice_bytes);

  1045. 

  1046.         if (s->watermark_key) {

  1047.             uint32_t header = AV_RL32(&s->bc_slice.buffer[1]);

  1048.             AV_WL32(&s->bc_slice.buffer[1], header ^ s->watermark_key);

  1049.         }

  1050.         if (length > 0) {

  1051.             memcpy(s->slice_buf, &s->slice_buf[slice_length], length - 1);

  1052.         }

  1053.         bitstream_skip(&s->bc, slice_bytes * 8);

  1054.         bitstream_init(&s->bc_slice, s->slice_buf, slice_bits);

  1055.     }

  1056. 

  1057.     if ((slice_id = get_interleaved_ue_golomb(&s->bc_slice)) >= 3) {

  1058.         av_log(s->avctx, AV_LOG_ERROR, "illegal slice type %u \n", slice_id);

  1059.         return -1;

  1060.     }

  1061. 

  1062.     s->pict_type = ff_h264_golomb_to_pict_type[slice_id];

  1063. 

  1064.     if ((header & 0x9F) == 2) {

  1065.         i = (s->mb_num < 64) ? 6 : (1 + av_log2(s->mb_num - 1));

  1066.         bitstream_read(&s->bc_slice, i);

  1067.     } else {

  1068.         bitstream_skip(&s->bc_slice, 1);

  1069.     }

  1070. 

  1071.     s->slice_num      = bitstream_read(&s->bc_slice, 8);

  1072.     s->qscale         = bitstream_read(&s->bc_slice, 5);

  1073.     s->adaptive_quant = bitstream_read_bit(&s->bc_slice);

  1074. 

  1075.     /* unknown fields */

  1076.     bitstream_skip(&s->bc_slice, 1);

  1077. 

  1078.     if (s->unknown_flag)

  1079.         bitstream_skip(&s->bc_slice, 1);

  1080. 

  1081.     bitstream_skip(&s->bc_slice, 1);

  1082.     bitstream_skip(&s->bc_slice, 2);

  1083. 

  1084.     while (bitstream_read_bit(&s->bc_slice))

  1085.         bitstream_skip(&s->bc_slice, 8);

  1086. 

  1087.     /* reset intra predictors and invalidate motion vector references */

  1088.     if (s->mb_x > 0) {

  1089.         memset(s->intra4x4_pred_mode + s->mb2br_xy[mb_xy - 1] + 3,

  1090.                -1, 4 * sizeof(int8_t));

  1091.         memset(s->intra4x4_pred_mode + s->mb2br_xy[mb_xy - s->mb_x],

  1092.                -1, 8 * sizeof(int8_t) * s->mb_x);

  1093.     }

  1094.     if (s->mb_y > 0) {

  1095.         memset(s->intra4x4_pred_mode + s->mb2br_xy[mb_xy - s->mb_stride],

  1096.                -1, 8 * sizeof(int8_t) * (s->mb_width - s->mb_x));

  1097. 

  1098.         if (s->mb_x > 0)

  1099.             s->intra4x4_pred_mode[s->mb2br_xy[mb_xy - s->mb_stride - 1] + 3] = -1;

  1100.     }

  1101. 

  1102.     return 0;

  1103. }

  1104. 

  1105. static void init_dequant4_coeff_table(SVQ3Context *s)

  1106. {

  1107.     int q, x;

  1108.     const int max_qp = 51;

  1109. 

  1110.     for (q = 0; q < max_qp + 1; q++) {

  1111.         int shift = ff_h264_quant_div6[q] + 2;

  1112.         int idx   = ff_h264_quant_rem6[q];

  1113.         for (x = 0; x < 16; x++)

  1114.             s->dequant4_coeff[q][(x >> 2) | ((x << 2) & 0xF)] =

  1115.                 ((uint32_t)ff_h264_dequant4_coeff_init[idx][(x & 1) + ((x >> 2) & 1)] * 16) << shift;

  1116.     }

  1117. }

  1118. 

  1119. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  1120. {

  1121.     SVQ3Context *s = avctx->priv_data;

  1122.     int m, x, y;

  1123.     unsigned char *extradata;

  1124.     unsigned char *extradata_end;

  1125.     unsigned int size;

  1126.     int marker_found = 0;

  1127. 

  1128.     s->cur_pic  = av_mallocz(sizeof(*s->cur_pic));

  1129.     s->last_pic = av_mallocz(sizeof(*s->last_pic));

  1130.     s->next_pic = av_mallocz(sizeof(*s->next_pic));

  1131.     if (!s->next_pic || !s->last_pic || !s->cur_pic) {

  1132.         av_freep(&s->cur_pic);

  1133.         av_freep(&s->last_pic);

  1134.         av_freep(&s->next_pic);

  1135.         return AVERROR(ENOMEM);

  1136.     }

  1137. 

  1138.     s->cur_pic->f  = av_frame_alloc();

  1139.     s->last_pic->f = av_frame_alloc();

  1140.     s->next_pic->f = av_frame_alloc();

  1141.     if (!s->cur_pic->f || !s->last_pic->f || !s->next_pic->f)

  1142.         return AVERROR(ENOMEM);

  1143. 

  1144.     ff_h264dsp_init(&s->h264dsp, 8, 1);

  1145.     ff_h264_pred_init(&s->hpc, AV_CODEC_ID_SVQ3, 8, 1);

  1146.     ff_videodsp_init(&s->vdsp, 8);

  1147. 

  1148.     ff_hpeldsp_init(&s->hdsp, avctx->flags);

  1149.     ff_tpeldsp_init(&s->tdsp);

  1150. 

  1151.     avctx->pix_fmt     = AV_PIX_FMT_YUVJ420P;

  1152.     avctx->color_range = AVCOL_RANGE_JPEG;

  1153. 

  1154.     s->avctx         = avctx;

  1155.     s->halfpel_flag  = 1;

  1156.     s->thirdpel_flag = 1;

  1157.     s->unknown_flag  = 0;

  1158. 

  1159.     /* prowl for the "SEQH" marker in the extradata */

  1160.     extradata     = (unsigned char *)avctx->extradata;

  1161.     extradata_end = avctx->extradata + avctx->extradata_size;

  1162.     if (extradata) {

  1163.         for (m = 0; m + 8 < avctx->extradata_size; m++) {

  1164.             if (!memcmp(extradata, "SEQH", 4)) {

  1165.                 marker_found = 1;

  1166.                 break;

  1167.             }

  1168.             extradata++;

  1169.         }

  1170.     }

  1171. 

  1172.     /* if a match was found, parse the extra data */

  1173.     if (marker_found) {

  1174.         BitstreamContext bc;

  1175.         int frame_size_code;

  1176. 

  1177.         size = AV_RB32(&extradata[4]);

  1178.         if (size > extradata_end - extradata - 8)

  1179.             return AVERROR_INVALIDDATA;

  1180.         bitstream_init8(&bc, extradata + 8, size);

  1181. 

  1182.         /* 'frame size code' and optional 'width, height' */

  1183.         frame_size_code = bitstream_read(&bc, 3);

  1184.         switch (frame_size_code) {

  1185.         case 0:

  1186.             avctx->width  = 160;

  1187.             avctx->height = 120;

  1188.             break;

  1189.         case 1:

  1190.             avctx->width  = 128;

  1191.             avctx->height =  96;

  1192.             break;

  1193.         case 2:

  1194.             avctx->width  = 176;

  1195.             avctx->height = 144;

  1196.             break;

  1197.         case 3:

  1198.             avctx->width  = 352;

  1199.             avctx->height = 288;

  1200.             break;

  1201.         case 4:

  1202.             avctx->width  = 704;

  1203.             avctx->height = 576;

  1204.             break;

  1205.         case 5:

  1206.             avctx->width  = 240;

  1207.             avctx->height = 180;

  1208.             break;

  1209.         case 6:

  1210.             avctx->width  = 320;

  1211.             avctx->height = 240;

  1212.             break;

  1213.         case 7:

  1214.             avctx->width  = bitstream_read(&bc, 12);

  1215.             avctx->height = bitstream_read(&bc, 12);

  1216.             break;

  1217.         }

  1218. 

  1219.         s->halfpel_flag  = bitstream_read_bit(&bc);

  1220.         s->thirdpel_flag = bitstream_read_bit(&bc);

  1221. 

  1222.         /* unknown fields */

  1223.         bitstream_skip(&bc, 1);

  1224.         bitstream_skip(&bc, 1);

  1225.         bitstream_skip(&bc, 1);

  1226.         bitstream_skip(&bc, 1);

  1227. 

  1228.         s->low_delay = bitstream_read_bit(&bc);

  1229. 

  1230.         /* unknown field */

  1231.         bitstream_skip(&bc, 1);

  1232. 

  1233.         while (bitstream_read_bit(&bc))

  1234.             bitstream_skip(&bc, 8);

  1235. 

  1236.         s->unknown_flag  = bitstream_read_bit(&bc);

  1237.         avctx->has_b_frames = !s->low_delay;

  1238.         if (s->unknown_flag) {

  1239. #if CONFIG_ZLIB

  1240.             unsigned watermark_width  = get_interleaved_ue_golomb(&bc);

  1241.             unsigned watermark_height = get_interleaved_ue_golomb(&bc);

  1242.             int u1                    = get_interleaved_ue_golomb(&bc);

  1243.             int u2                    = bitstream_read(&bc, 8);

  1244.             int u3                    = bitstream_read(&bc, 2);

  1245.             int u4                    = get_interleaved_ue_golomb(&bc);

  1246.             unsigned long buf_len     = watermark_width *

  1247.                                         watermark_height * 4;

  1248.             int offset                = bitstream_tell(&bc) + 7 >> 3;

  1249.             uint8_t *buf;

  1250. 

  1251.             if (watermark_height > 0 &&

  1252.                 (uint64_t)watermark_width * 4 > UINT_MAX / watermark_height)

  1253.                 return -1;

  1254. 

  1255.             buf = av_malloc(buf_len);

  1256.             av_log(avctx, AV_LOG_DEBUG, "watermark size: %ux%u\n",

  1257.                    watermark_width, watermark_height);

  1258.             av_log(avctx, AV_LOG_DEBUG,

  1259.                    "u1: %x u2: %x u3: %x compressed data size: %d offset: %d\n",

  1260.                    u1, u2, u3, u4, offset);

  1261.             if (uncompress(buf, &buf_len, extradata + 8 + offset,

  1262.                            size - offset) != Z_OK) {

  1263.                 av_log(avctx, AV_LOG_ERROR,

  1264.                        "could not uncompress watermark logo\n");

  1265.                 av_free(buf);

  1266.                 return -1;

  1267.             }

  1268.             s->watermark_key = ff_svq1_packet_checksum(buf, buf_len, 0);

  1269.             s->watermark_key = s->watermark_key << 16 | s->watermark_key;

  1270.             av_log(avctx, AV_LOG_DEBUG,

  1271.                    "watermark key %#"PRIx32"\n", s->watermark_key);

  1272.             av_free(buf);

  1273. #else

  1274.             av_log(avctx, AV_LOG_ERROR,

  1275.                    "this svq3 file contains watermark which need zlib support compiled in\n");

  1276.             return -1;

  1277. #endif

  1278.         }

  1279.     }

  1280. 

  1281.     s->mb_width   = (avctx->width + 15) / 16;

  1282.     s->mb_height  = (avctx->height + 15) / 16;

  1283.     s->mb_stride  = s->mb_width + 1;

  1284.     s->mb_num     = s->mb_width * s->mb_height;

  1285.     s->b_stride   = 4 * s->mb_width;

  1286.     s->h_edge_pos = s->mb_width * 16;

  1287.     s->v_edge_pos = s->mb_height * 16;

  1288. 

  1289.     s->intra4x4_pred_mode = av_mallocz(s->mb_stride * 2 * 8);

  1290.     if (!s->intra4x4_pred_mode)

  1291.         return AVERROR(ENOMEM);

  1292. 

  1293.     s->mb2br_xy = av_mallocz(s->mb_stride * (s->mb_height + 1) *

  1294.                              sizeof(*s->mb2br_xy));

  1295.     if (!s->mb2br_xy)

  1296.         return AVERROR(ENOMEM);

  1297. 

  1298.     for (y = 0; y < s->mb_height; y++)

  1299.         for (x = 0; x < s->mb_width; x++) {

  1300.             const int mb_xy = x + y * s->mb_stride;

  1301. 

  1302.             s->mb2br_xy[mb_xy] = 8 * (mb_xy % (2 * s->mb_stride));

  1303.         }

  1304. 

  1305.     init_dequant4_coeff_table(s);

  1306. 

  1307.     return 0;

  1308. }

  1309. 

  1310. static void free_picture(AVCodecContext *avctx, SVQ3Frame *pic)

  1311. {

  1312.     int i;

  1313.     for (i = 0; i < 2; i++) {

  1314.         av_buffer_unref(&pic->motion_val_buf[i]);

  1315.         av_buffer_unref(&pic->ref_index_buf[i]);

  1316.     }

  1317.     av_buffer_unref(&pic->mb_type_buf);

  1318. 

  1319.     av_frame_unref(pic->f);

  1320. }

  1321. 

  1322. static int get_buffer(AVCodecContext *avctx, SVQ3Frame *pic)

  1323. {

  1324.     SVQ3Context *s = avctx->priv_data;

  1325.     const int big_mb_num    = s->mb_stride * (s->mb_height + 1) + 1;

  1326.     const int mb_array_size = s->mb_stride * s->mb_height;

  1327.     const int b4_stride     = s->mb_width * 4 + 1;

  1328.     const int b4_array_size = b4_stride * s->mb_height * 4;

  1329.     int ret;

  1330. 

  1331.     if (!pic->motion_val_buf[0]) {

  1332.         int i;

  1333. 

  1334.         pic->mb_type_buf = av_buffer_allocz((big_mb_num + s->mb_stride) * sizeof(uint32_t));

  1335.         if (!pic->mb_type_buf)

  1336.             return AVERROR(ENOMEM);

  1337.         pic->mb_type = (uint32_t*)pic->mb_type_buf->data + 2 * s->mb_stride + 1;

  1338. 

  1339.         for (i = 0; i < 2; i++) {

  1340.             pic->motion_val_buf[i] = av_buffer_allocz(2 * (b4_array_size + 4) * sizeof(int16_t));

  1341.             pic->ref_index_buf[i]  = av_buffer_allocz(4 * mb_array_size);

  1342.             if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i]) {

  1343.                 ret = AVERROR(ENOMEM);

  1344.                 goto fail;

  1345.             }

  1346. 

  1347.             pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;

  1348.             pic->ref_index[i]  = pic->ref_index_buf[i]->data;

  1349.         }

  1350.     }

  1351. 

  1352.     ret = ff_get_buffer(avctx, pic->f,

  1353.                         (s->pict_type != AV_PICTURE_TYPE_B) ?

  1354.                          AV_GET_BUFFER_FLAG_REF : 0);

  1355.     if (ret < 0)

  1356.         goto fail;

  1357. 

  1358.     if (!s->edge_emu_buffer) {

  1359.         s->edge_emu_buffer = av_mallocz(pic->f->linesize[0] * 17);

  1360.         if (!s->edge_emu_buffer)

  1361.             return AVERROR(ENOMEM);

  1362.     }

  1363. 

  1364.     return 0;

  1365. fail:

  1366.     free_picture(avctx, pic);

  1367.     return ret;

  1368. }

  1369. 

  1370. static int svq3_decode_frame(AVCodecContext *avctx, void *data,

  1371.                              int *got_frame, AVPacket *avpkt)

  1372. {

  1373.     const uint8_t *buf = avpkt->data;

  1374.     SVQ3Context *s     = avctx->priv_data;

  1375.     int buf_size       = avpkt->size;

  1376.     int ret, m, i;

  1377. 

  1378.     /* special case for last picture */

  1379.     if (buf_size == 0) {

  1380.         if (s->next_pic->f->data[0] && !s->low_delay && !s->last_frame_output) {

  1381.             ret = av_frame_ref(data, s->next_pic->f);

  1382.             if (ret < 0)

  1383.                 return ret;

  1384.             s->last_frame_output = 1;

  1385.             *got_frame          = 1;

  1386.         }

  1387.         return 0;

  1388.     }

  1389. 

  1390.     ret = bitstream_init8(&s->bc, buf, buf_size);

  1391.     if (ret < 0)

  1392.         return ret;

  1393. 

  1394.     s->mb_x = s->mb_y = s->mb_xy = 0;

  1395. 

  1396.     if (svq3_decode_slice_header(avctx))

  1397.         return -1;

  1398. 

  1399.     if (s->pict_type != AV_PICTURE_TYPE_B)

  1400.         FFSWAP(SVQ3Frame*, s->next_pic, s->last_pic);

  1401. 

  1402.     av_frame_unref(s->cur_pic->f);

  1403. 

  1404.     /* for skipping the frame */

  1405.     s->cur_pic->f->pict_type = s->pict_type;

  1406.     s->cur_pic->f->key_frame = (s->pict_type == AV_PICTURE_TYPE_I);

  1407. 

  1408.     ret = get_buffer(avctx, s->cur_pic);

  1409.     if (ret < 0)

  1410.         return ret;

  1411. 

  1412.     for (i = 0; i < 16; i++) {

  1413.         s->block_offset[i]           = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * s->cur_pic->f->linesize[0] * ((scan8[i] - scan8[0]) >> 3);

  1414.         s->block_offset[48 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * s->cur_pic->f->linesize[0] * ((scan8[i] - scan8[0]) >> 3);

  1415.     }

  1416.     for (i = 0; i < 16; i++) {

  1417.         s->block_offset[16 + i]      =

  1418.         s->block_offset[32 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * s->cur_pic->f->linesize[1] * ((scan8[i] - scan8[0]) >> 3);

  1419.         s->block_offset[48 + 16 + i] =

  1420.         s->block_offset[48 + 32 + i] = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * s->cur_pic->f->linesize[1] * ((scan8[i] - scan8[0]) >> 3);

  1421.     }

  1422. 

  1423.     if (s->pict_type != AV_PICTURE_TYPE_I) {

  1424.         if (!s->last_pic->f->data[0]) {

  1425.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1426.             ret = get_buffer(avctx, s->last_pic);

  1427.             if (ret < 0)

  1428.                 return ret;

  1429.             memset(s->last_pic->f->data[0], 0, avctx->height * s->last_pic->f->linesize[0]);

  1430.             memset(s->last_pic->f->data[1], 0x80, (avctx->height / 2) *

  1431.                    s->last_pic->f->linesize[1]);

  1432.             memset(s->last_pic->f->data[2], 0x80, (avctx->height / 2) *

  1433.                    s->last_pic->f->linesize[2]);

  1434.         }

  1435. 

  1436.         if (s->pict_type == AV_PICTURE_TYPE_B && !s->next_pic->f->data[0]) {

  1437.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1438.             ret = get_buffer(avctx, s->next_pic);

  1439.             if (ret < 0)

  1440.                 return ret;

  1441.             memset(s->next_pic->f->data[0], 0, avctx->height * s->next_pic->f->linesize[0]);

  1442.             memset(s->next_pic->f->data[1], 0x80, (avctx->height / 2) *

  1443.                    s->next_pic->f->linesize[1]);

  1444.             memset(s->next_pic->f->data[2], 0x80, (avctx->height / 2) *

  1445.                    s->next_pic->f->linesize[2]);

  1446.         }

  1447.     }

  1448. 

  1449.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  1450.         av_log(s->avctx, AV_LOG_DEBUG,

  1451.                "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n",

  1452.                av_get_picture_type_char(s->pict_type),

  1453.                s->halfpel_flag, s->thirdpel_flag,

  1454.                s->adaptive_quant, s->qscale, s->slice_num);

  1455. 

  1456.     if (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B ||

  1457.         avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I ||

  1458.         avctx->skip_frame >= AVDISCARD_ALL)

  1459.         return 0;

  1460. 

  1461.     if (s->next_p_frame_damaged) {

  1462.         if (s->pict_type == AV_PICTURE_TYPE_B)

  1463.             return 0;

  1464.         else

  1465.             s->next_p_frame_damaged = 0;

  1466.     }

  1467. 

  1468.     if (s->pict_type == AV_PICTURE_TYPE_B) {

  1469.         s->frame_num_offset = s->slice_num - s->prev_frame_num;

  1470. 

  1471.         if (s->frame_num_offset < 0)

  1472.             s->frame_num_offset += 256;

  1473.         if (s->frame_num_offset == 0 ||

  1474.             s->frame_num_offset >= s->prev_frame_num_offset) {

  1475.             av_log(s->avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  1476.             return -1;

  1477.         }

  1478.     } else {

  1479.         s->prev_frame_num        = s->frame_num;

  1480.         s->frame_num             = s->slice_num;

  1481.         s->prev_frame_num_offset = s->frame_num - s->prev_frame_num;

  1482. 

  1483.         if (s->prev_frame_num_offset < 0)

  1484.             s->prev_frame_num_offset += 256;

  1485.     }

  1486. 

  1487.     for (m = 0; m < 2; m++) {

  1488.         int i;

  1489.         for (i = 0; i < 4; i++) {

  1490.             int j;

  1491.             for (j = -1; j < 4; j++)

  1492.                 s->ref_cache[m][scan8[0] + 8 * i + j] = 1;

  1493.             if (i < 3)

  1494.                 s->ref_cache[m][scan8[0] + 8 * i + j] = PART_NOT_AVAILABLE;

  1495.         }

  1496.     }

  1497. 

  1498.     for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  1499.         for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  1500.             unsigned mb_type;

  1501.             s->mb_xy = s->mb_x + s->mb_y * s->mb_stride;

  1502. 

  1503.             if ((bitstream_bits_left(&s->bc_slice)) <= 7) {

  1504.                 if (((bitstream_tell(&s->bc_slice) & 7) == 0 ||

  1505.                     bitstream_peek(&s->bc_slice, bitstream_bits_left(&s->bc_slice) & 7) == 0)) {

  1506. 

  1507.                     if (svq3_decode_slice_header(avctx))

  1508.                         return -1;

  1509.                 }

  1510.                 /* TODO: support s->mb_skip_run */

  1511.             }

  1512. 

  1513.             mb_type = get_interleaved_ue_golomb(&s->bc_slice);

  1514. 

  1515.             if (s->pict_type == AV_PICTURE_TYPE_I)

  1516.                 mb_type += 8;

  1517.             else if (s->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4)

  1518.                 mb_type += 4;

  1519.             if (mb_type > 33 || svq3_decode_mb(s, mb_type)) {

  1520.                 av_log(s->avctx, AV_LOG_ERROR,

  1521.                        "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1522.                 return -1;

  1523.             }

  1524. 

  1525.             if (mb_type != 0)

  1526.                 hl_decode_mb(s);

  1527. 

  1528.             if (s->pict_type != AV_PICTURE_TYPE_B && !s->low_delay)

  1529.                 s->cur_pic->mb_type[s->mb_x + s->mb_y * s->mb_stride] =

  1530.                     (s->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1531.         }

  1532. 

  1533.         ff_draw_horiz_band(avctx, s->cur_pic->f,

  1534.                            s->last_pic->f->data[0] ? s->last_pic->f : NULL,

  1535.                            16 * s->mb_y, 16, PICT_FRAME, 0,

  1536.                            s->low_delay);

  1537.     }

  1538. 

  1539.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay)

  1540.         ret = av_frame_ref(data, s->cur_pic->f);

  1541.     else if (s->last_pic->f->data[0])

  1542.         ret = av_frame_ref(data, s->last_pic->f);

  1543.     if (ret < 0)

  1544.         return ret;

  1545. 

  1546.     /* Do not output the last pic after seeking. */

  1547.     if (s->last_pic->f->data[0] || s->low_delay)

  1548.         *got_frame = 1;

  1549. 

  1550.     if (s->pict_type != AV_PICTURE_TYPE_B) {

  1551.         FFSWAP(SVQ3Frame*, s->cur_pic, s->next_pic);

  1552.     } else {

  1553.         av_frame_unref(s->cur_pic->f);

  1554.     }

  1555. 

  1556.     return buf_size;

  1557. }

  1558. 

  1559. static av_cold int svq3_decode_end(AVCodecContext *avctx)

  1560. {

  1561.     SVQ3Context *s = avctx->priv_data;

  1562. 

  1563.     free_picture(avctx, s->cur_pic);

  1564.     free_picture(avctx, s->next_pic);

  1565.     free_picture(avctx, s->last_pic);

  1566.     av_frame_free(&s->cur_pic->f);

  1567.     av_frame_free(&s->next_pic->f);

  1568.     av_frame_free(&s->last_pic->f);

  1569.     av_freep(&s->cur_pic);

  1570.     av_freep(&s->next_pic);

  1571.     av_freep(&s->last_pic);

  1572.     av_freep(&s->slice_buf);

  1573.     av_freep(&s->intra4x4_pred_mode);

  1574.     av_freep(&s->edge_emu_buffer);

  1575.     av_freep(&s->mb2br_xy);

  1576. 

  1577.     return 0;

  1578. }

  1579. 

  1580. AVCodec ff_svq3_decoder = {

  1581.     .name           = "svq3",

  1582.     .long_name      = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1583.     .type           = AVMEDIA_TYPE_VIDEO,

  1584.     .id             = AV_CODEC_ID_SVQ3,

  1585.     .priv_data_size = sizeof(SVQ3Context),

  1586.     .init           = svq3_decode_init,

  1587.     .close          = svq3_decode_end,

  1588.     .decode         = svq3_decode_frame,

  1589.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND |

  1590.                       AV_CODEC_CAP_DR1             |

  1591.                       AV_CODEC_CAP_DELAY,

  1592.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P,

  1593.                                                      AV_PIX_FMT_NONE},

  1594. };