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FFmpeg/libavcodec/svq3.c

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  1. /*

  2.  * Copyright (c) 2003 The Libav Project

  3.  *

  4.  * This file is part of Libav.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. /*

  22.  * How to use this decoder:

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

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

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

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

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

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

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

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

  31.  *

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

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

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

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

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

  37.  *

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

  39.  * correctly decodes this file:

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

  41.  */

  42. 

  43. #include <inttypes.h>

  44. 

  45. #include "libavutil/attributes.h"

  46. #include "internal.h"

  47. #include "avcodec.h"

  48. #include "mpegutils.h"

  49. #include "h264.h"

  50. #include "h264_mvpred.h"

  51. #include "h264data.h"

  52. #include "golomb.h"

  53. #include "hpeldsp.h"

  54. #include "mathops.h"

  55. #include "rectangle.h"

  56. #include "tpeldsp.h"

  57. 

  58. #if CONFIG_ZLIB

  59. #include <zlib.h>

  60. #endif

  61. 

  62. #include "svq1.h"

  63. 

  64. /**

  65.  * @file

  66.  * svq3 decoder.

  67.  */

  68. 

  69. typedef struct SVQ3Context {

  70.     H264Context h;

  71. 

  72.     H264DSPContext  h264dsp;

  73.     H264PredContext hpc;

  74.     HpelDSPContext hdsp;

  75.     TpelDSPContext tdsp;

  76.     VideoDSPContext vdsp;

  77. 

  78.     H264Picture *cur_pic;

  79.     H264Picture *next_pic;

  80.     H264Picture *last_pic;

  81.     GetBitContext gb;

  82.     uint8_t *slice_buf;

  83.     int slice_size;

  84.     int halfpel_flag;

  85.     int thirdpel_flag;

  86.     int unknown_flag;

  87.     uint32_t watermark_key;

  88.     int adaptive_quant;

  89.     int next_p_frame_damaged;

  90.     int h_edge_pos;

  91.     int v_edge_pos;

  92.     int last_frame_output;

  93. } SVQ3Context;

  94. 

  95. #define FULLPEL_MODE  1

  96. #define HALFPEL_MODE  2

  97. #define THIRDPEL_MODE 3

  98. #define PREDICT_MODE  4

  99. 

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

  101.  * o-->o-->o   o

  102.  *         |  /|

  103.  * o   o   o / o

  104.  * | / |   |/  |

  105.  * o   o   o   o

  106.  *   /

  107.  * o-->o-->o-->o

  108.  */

  109. static const uint8_t svq3_scan[16] = {

  110.     0 + 0 * 4, 1 + 0 * 4, 2 + 0 * 4, 2 + 1 * 4,

  111.     2 + 2 * 4, 3 + 0 * 4, 3 + 1 * 4, 3 + 2 * 4,

  112.     0 + 1 * 4, 0 + 2 * 4, 1 + 1 * 4, 1 + 2 * 4,

  113.     0 + 3 * 4, 1 + 3 * 4, 2 + 3 * 4, 3 + 3 * 4,

  114. };

  115. 

  116. static const uint8_t luma_dc_zigzag_scan[16] = {

  117.     0 * 16 + 0 * 64, 1 * 16 + 0 * 64, 2 * 16 + 0 * 64, 0 * 16 + 2 * 64,

  118.     3 * 16 + 0 * 64, 0 * 16 + 1 * 64, 1 * 16 + 1 * 64, 2 * 16 + 1 * 64,

  119.     1 * 16 + 2 * 64, 2 * 16 + 2 * 64, 3 * 16 + 2 * 64, 0 * 16 + 3 * 64,

  120.     3 * 16 + 1 * 64, 1 * 16 + 3 * 64, 2 * 16 + 3 * 64, 3 * 16 + 3 * 64,

  121. };

  122. 

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

  124.     { 0, 0 },

  125.     { 1, 0 }, { 0, 1 },

  126.     { 0, 2 }, { 1, 1 }, { 2, 0 },

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

  128.     { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

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

  130.     { 2, 4 }, { 3, 3 }, { 4, 2 },

  131.     { 4, 3 }, { 3, 4 },

  132.     { 4, 4 }

  133. };

  134. 

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

  136.     { { 2, -1, -1, -1, -1 }, { 2, 1, -1, -1, -1 }, { 1, 2, -1, -1, -1 },

  137.       { 2,  1, -1, -1, -1 }, { 1, 2, -1, -1, -1 }, { 1, 2, -1, -1, -1 } },

  138.     { { 0,  2, -1, -1, -1 }, { 0, 2,  1,  4,  3 }, { 0, 1,  2,  4,  3 },

  139.       { 0,  2,  1,  4,  3 }, { 2, 0,  1,  3,  4 }, { 0, 4,  2,  1,  3 } },

  140.     { { 2,  0, -1, -1, -1 }, { 2, 1,  0,  4,  3 }, { 1, 2,  4,  0,  3 },

  141.       { 2,  1,  0,  4,  3 }, { 2, 1,  4,  3,  0 }, { 1, 2,  4,  0,  3 } },

  142.     { { 2,  0, -1, -1, -1 }, { 2, 0,  1,  4,  3 }, { 1, 2,  0,  4,  3 },

  143.       { 2,  1,  0,  4,  3 }, { 2, 1,  3,  4,  0 }, { 2, 4,  1,  0,  3 } },

  144.     { { 0,  2, -1, -1, -1 }, { 0, 2,  1,  3,  4 }, { 1, 2,  3,  0,  4 },

  145.       { 2,  0,  1,  3,  4 }, { 2, 1,  3,  0,  4 }, { 2, 0,  4,  3,  1 } },

  146.     { { 0,  2, -1, -1, -1 }, { 0, 2,  4,  1,  3 }, { 1, 4,  2,  0,  3 },

  147.       { 4,  2,  0,  1,  3 }, { 2, 0,  1,  4,  3 }, { 4, 2,  1,  0,  3 } },

  148. };

  149. 

  150. static const struct {

  151.     uint8_t run;

  152.     uint8_t level;

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

  154.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  155.       { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  156.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  157.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  158. };

  159. 

  160. static const uint32_t svq3_dequant_coeff[32] = {

  161.      3881,  4351,  4890,  5481,   6154,   6914,   7761,   8718,

  162.      9781, 10987, 12339, 13828,  15523,  17435,  19561,  21873,

  163.     24552, 27656, 30847, 34870,  38807,  43747,  49103,  54683,

  164.     61694, 68745, 77615, 89113, 100253, 109366, 126635, 141533

  165. };

  166. 

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

  168. {

  169.     const int qmul = svq3_dequant_coeff[qp];

  170. #define stride 16

  171.     int i;

  172.     int temp[16];

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

  174. 

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

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

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

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

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

  180. 

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

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

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

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

  185.     }

  186. 

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

  188.         const int offset = x_offset[i];

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

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

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

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

  193. 

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

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

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

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

  198.     }

  199. }

  200. #undef stride

  201. 

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

  203.                             int stride, int qp, int dc)

  204. {

  205.     const int qmul = svq3_dequant_coeff[qp];

  206.     int i;

  207. 

  208.     if (dc) {

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

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

  211.         block[0] = 0;

  212.     }

  213. 

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

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

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

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

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

  219. 

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

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

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

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

  224.     }

  225. 

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

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

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

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

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

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

  232. 

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

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

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

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

  237.     }

  238. 

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

  240. }

  241. 

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

  243.                                     int index, const int type)

  244. {

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

  246.         luma_dc_zigzag_scan, ff_zigzag_scan, svq3_scan, ff_h264_chroma_dc_scan

  247.     };

  248. 

  249.     int run, level, limit;

  250.     unsigned vlc;

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

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

  253. 

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

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

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

  257.             vlc      = vlc + 1 >> 1;

  258. 

  259.             if (type == 3) {

  260.                 if (vlc < 3) {

  261.                     run   = 0;

  262.                     level = vlc;

  263.                 } else if (vlc < 4) {

  264.                     run   = 1;

  265.                     level = 1;

  266.                 } else {

  267.                     run   = vlc & 0x3;

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

  269.                 }

  270.             } else {

  271.                 if (vlc < 16) {

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

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

  274.                 } else if (intra) {

  275.                     run   = vlc & 0x7;

  276.                     level = (vlc >> 3) +

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

  278.                 } else {

  279.                     run   = vlc & 0xF;

  280.                     level = (vlc >> 4) +

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

  282.                 }

  283.             }

  284. 

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

  286.                 return -1;

  287. 

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

  289.         }

  290. 

  291.         if (type != 2) {

  292.             break;

  293.         }

  294.     }

  295. 

  296.     return 0;

  297. }

  298. 

  299. static inline void svq3_mc_dir_part(SVQ3Context *s,

  300.                                     int x, int y, int width, int height,

  301.                                     int mx, int my, int dxy,

  302.                                     int thirdpel, int dir, int avg)

  303. {

  304.     H264Context *h = &s->h;

  305.     H264SliceContext *sl = &h->slice_ctx[0];

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

  307.     uint8_t *src, *dest;

  308.     int i, emu = 0;

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

  310. 

  311.     mx += x;

  312.     my += y;

  313. 

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

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

  316.         emu = 1;

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

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

  319.     }

  320. 

  321.     /* form component predictions */

  322.     dest = h->cur_pic.f->data[0] + x + y * sl->linesize;

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

  324. 

  325.     if (emu) {

  326.         s->vdsp.emulated_edge_mc(sl->edge_emu_buffer, src,

  327.                                  sl->linesize, sl->linesize,

  328.                                  width + 1, height + 1,

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

  330.         src = sl->edge_emu_buffer;

  331.     }

  332.     if (thirdpel)

  333.         (avg ? s->tdsp.avg_tpel_pixels_tab

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

  335.                                                  width, height);

  336.     else

  337.         (avg ? s->hdsp.avg_pixels_tab

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

  339.                                                        height);

  340. 

  341.     if (!(h->flags & AV_CODEC_FLAG_GRAY)) {

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

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

  344.         width  = width  >> 1;

  345.         height = height >> 1;

  346.         blocksize++;

  347. 

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

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

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

  351. 

  352.             if (emu) {

  353.                 s->vdsp.emulated_edge_mc(sl->edge_emu_buffer, src,

  354.                                          sl->uvlinesize, sl->uvlinesize,

  355.                                          width + 1, height + 1,

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

  357.                                          s->v_edge_pos >> 1);

  358.                 src = sl->edge_emu_buffer;

  359.             }

  360.             if (thirdpel)

  361.                 (avg ? s->tdsp.avg_tpel_pixels_tab

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

  363.                                                          sl->uvlinesize,

  364.                                                          width, height);

  365.             else

  366.                 (avg ? s->hdsp.avg_pixels_tab

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

  368.                                                                sl->uvlinesize,

  369.                                                                height);

  370.         }

  371.     }

  372. }

  373. 

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

  375.                               int dir, int avg)

  376. {

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

  378.     H264Context *h          = &s->h;

  379.     H264SliceContext *sl    = &h->slice_ctx[0];

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

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

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

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

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

  385. 

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

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

  388.             const int b_xy = (4 * sl->mb_x + (j >> 2)) +

  389.                              (4 * sl->mb_y + (i >> 2)) * h->b_stride;

  390.             int dxy;

  391.             x = 16 * sl->mb_x + j;

  392.             y = 16 * sl->mb_y + i;

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

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

  395. 

  396.             if (mode != PREDICT_MODE) {

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

  398.             } else {

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

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

  401. 

  402.                 if (dir == 0) {

  403.                     mx = mx * h->frame_num_offset /

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

  405.                     my = my * h->frame_num_offset /

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

  407.                 } else {

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

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

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

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

  412.                 }

  413.             }

  414. 

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

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

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

  418. 

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

  420.             if (mode == PREDICT_MODE) {

  421.                 dx = dy = 0;

  422.             } else {

  423.                 dy = svq3_get_se_golomb(&h->gb);

  424.                 dx = svq3_get_se_golomb(&h->gb);

  425. 

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

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

  428.                     return -1;

  429.                 }

  430.             }

  431. 

  432.             /* compute motion vector */

  433.             if (mode == THIRDPEL_MODE) {

  434.                 int fx, fy;

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

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

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

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

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

  440. 

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

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

  443.                 mx += mx;

  444.                 my += my;

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

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

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

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

  449. 

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

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

  452.                 mx *= 3;

  453.                 my *= 3;

  454.             } else {

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

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

  457. 

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

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

  460.                 mx *= 6;

  461.                 my *= 6;

  462.             }

  463. 

  464.             /* update mv_cache */

  465.             if (mode != PREDICT_MODE) {

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

  467. 

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

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

  470. 

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

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

  473.                 }

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

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

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

  477.                     AV_WN32A(sl->mv_cache[dir][scan8[k]], mv);

  478.             }

  479. 

  480.             /* write back motion vectors */

  481.             fill_rectangle(h->cur_pic.motion_val[dir][b_xy],

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

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

  484.         }

  485. 

  486.     return 0;

  487. }

  488. 

  489. static av_always_inline void hl_decode_mb_idct_luma(const H264Context *h, H264SliceContext *sl,

  490.                                                     int mb_type, const int *block_offset,

  491.                                                     int linesize, uint8_t *dest_y)

  492. {

  493.     int i;

  494.     if (!IS_INTRA4x4(mb_type)) {

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

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

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

  498.                 svq3_add_idct_c(ptr, sl->mb + i * 16, linesize,

  499.                                 sl->qscale, IS_INTRA(mb_type) ? 1 : 0);

  500.             }

  501.     }

  502. }

  503. 

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

  505. {

  506.     return AV_RN16A(mb + index);

  507. }

  508. 

  509. static av_always_inline void hl_decode_mb_predict_luma(SVQ3Context *s,

  510.                                                        const H264Context *h,

  511.                                                        H264SliceContext *sl,

  512.                                                        int mb_type,

  513.                                                        const int *block_offset,

  514.                                                        int linesize,

  515.                                                        uint8_t *dest_y)

  516. {

  517.     int i;

  518.     int qscale = sl->qscale;

  519. 

  520.     if (IS_INTRA4x4(mb_type)) {

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

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

  523.             const int dir      = sl->intra4x4_pred_mode_cache[scan8[i]];

  524. 

  525.             uint8_t *topright;

  526.             int nnz, tr;

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

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

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

  530.                 if (!topright_avail) {

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

  532.                     topright = (uint8_t *)&tr;

  533.                 } else

  534.                     topright = ptr + 4 - linesize;

  535.             } else

  536.                 topright = NULL;

  537. 

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

  539.             nnz = sl->non_zero_count_cache[scan8[i]];

  540.             if (nnz) {

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

  542.             }

  543.         }

  544.     } else {

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

  546.         svq3_luma_dc_dequant_idct_c(sl->mb, sl->mb_luma_dc[0], qscale);

  547.     }

  548. }

  549. 

  550. static void hl_decode_mb(SVQ3Context *s, const H264Context *h, H264SliceContext *sl)

  551. {

  552.     const int mb_x    = sl->mb_x;

  553.     const int mb_y    = sl->mb_y;

  554.     const int mb_xy   = sl->mb_xy;

  555.     const int mb_type = h->cur_pic.mb_type[mb_xy];

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

  557.     int linesize, uvlinesize;

  558.     int i, j;

  559.     const int *block_offset = &h->block_offset[0];

  560.     const int block_h   = 16 >> h->chroma_y_shift;

  561. 

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

  563.     dest_cb = h->cur_pic.f->data[1] +  mb_x * 8 + mb_y * sl->uvlinesize * block_h;

  564.     dest_cr = h->cur_pic.f->data[2] +  mb_x * 8 + mb_y * sl->uvlinesize * block_h;

  565. 

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

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

  568. 

  569.     h->list_counts[mb_xy] = sl->list_count;

  570. 

  571.     linesize   = sl->mb_linesize   = sl->linesize;

  572.     uvlinesize = sl->mb_uvlinesize = sl->uvlinesize;

  573. 

  574.     if (IS_INTRA(mb_type)) {

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

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

  577. 

  578.         hl_decode_mb_predict_luma(s, h, sl, mb_type, block_offset, linesize, dest_y);

  579.     }

  580. 

  581.     hl_decode_mb_idct_luma(h, sl, mb_type, block_offset, linesize, dest_y);

  582. 

  583.     if (sl->cbp & 0x30) {

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

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

  586.                                                h->dequant4_coeff[IS_INTRA(mb_type) ? 1 : 4][sl->chroma_qp[0]][0]);

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

  588.                                                h->dequant4_coeff[IS_INTRA(mb_type) ? 2 : 5][sl->chroma_qp[1]][0]);

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

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

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

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

  593.                     svq3_add_idct_c(ptr, sl->mb + i * 16,

  594.                                     uvlinesize, ff_h264_chroma_qp[0][sl->qscale + 12] - 12, 2);

  595.                 }

  596.         }

  597.     }

  598. }

  599. 

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

  601. {

  602.     H264Context *h = &s->h;

  603.     H264SliceContext *sl = &h->slice_ctx[0];

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

  605.     int cbp = 0;

  606.     uint32_t vlc;

  607.     int8_t *top, *left;

  608.     const int mb_xy         = sl->mb_xy;

  609.     const int b_xy          = 4 * sl->mb_x + 4 * sl->mb_y * h->b_stride;

  610. 

  611.     sl->top_samples_available      = (sl->mb_y == 0) ? 0x33FF : 0xFFFF;

  612.     sl->left_samples_available     = (sl->mb_x == 0) ? 0x5F5F : 0xFFFF;

  613.     sl->topright_samples_available = 0xFFFF;

  614. 

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

  616.         if (h->pict_type == AV_PICTURE_TYPE_P ||

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

  618.             svq3_mc_dir_part(s, 16 * sl->mb_x, 16 * sl->mb_y, 16, 16,

  619.                              0, 0, 0, 0, 0, 0);

  620. 

  621.             if (h->pict_type == AV_PICTURE_TYPE_B)

  622.                 svq3_mc_dir_part(s, 16 * sl->mb_x, 16 * sl->mb_y, 16, 16,

  623.                                  0, 0, 0, 0, 1, 1);

  624. 

  625.             mb_type = MB_TYPE_SKIP;

  626.         } else {

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

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

  629.                 return -1;

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

  631.                 return -1;

  632. 

  633.             mb_type = MB_TYPE_16x16;

  634.         }

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

  636.         if (s->thirdpel_flag && s->halfpel_flag == !get_bits1(&h->gb))

  637.             mode = THIRDPEL_MODE;

  638.         else if (s->halfpel_flag &&

  639.                  s->thirdpel_flag == !get_bits1(&h->gb))

  640.             mode = HALFPEL_MODE;

  641.         else

  642.             mode = FULLPEL_MODE;

  643. 

  644.         /* fill caches */

  645.         /* note ref_cache should contain here:

  646.          *  ????????

  647.          *  ???11111

  648.          *  N??11111

  649.          *  N??11111

  650.          *  N??11111

  651.          */

  652. 

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

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

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

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

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

  658.             } else {

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

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

  661.             }

  662.             if (sl->mb_y > 0) {

  663.                 memcpy(sl->mv_cache[m][scan8[0] - 1 * 8],

  664.                        h->cur_pic.motion_val[m][b_xy - h->b_stride],

  665.                        4 * 2 * sizeof(int16_t));

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

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

  668. 

  669.                 if (sl->mb_x < h->mb_width - 1) {

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

  671.                               h->cur_pic.motion_val[m][b_xy - h->b_stride + 4]);

  672.                     sl->ref_cache[m][scan8[0] + 4 - 1 * 8] =

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

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

  675.                 } else

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

  677.                 if (sl->mb_x > 0) {

  678.                     AV_COPY32(sl->mv_cache[m][scan8[0] - 1 - 1 * 8],

  679.                               h->cur_pic.motion_val[m][b_xy - h->b_stride - 1]);

  680.                     sl->ref_cache[m][scan8[0] - 1 - 1 * 8] =

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

  682.                 } else

  683.                     sl->ref_cache[m][scan8[0] - 1 - 1 * 8] = PART_NOT_AVAILABLE;

  684.             } else

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

  686.                        PART_NOT_AVAILABLE, 8);

  687. 

  688.             if (h->pict_type != AV_PICTURE_TYPE_B)

  689.                 break;

  690.         }

  691. 

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

  693.         if (h->pict_type == AV_PICTURE_TYPE_P) {

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

  695.                 return -1;

  696.         } else {        /* AV_PICTURE_TYPE_B */

  697.             if (mb_type != 2) {

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

  699.                     return -1;

  700.             } else {

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

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

  703.                            0, 4 * 2 * sizeof(int16_t));

  704.             }

  705.             if (mb_type != 1) {

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

  707.                     return -1;

  708.             } else {

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

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

  711.                            0, 4 * 2 * sizeof(int16_t));

  712.             }

  713.         }

  714. 

  715.         mb_type = MB_TYPE_16x16;

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

  717.         memset(sl->intra4x4_pred_mode_cache, -1, 8 * 5 * sizeof(int8_t));

  718. 

  719.         if (mb_type == 8) {

  720.             if (sl->mb_x > 0) {

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

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

  723.                 if (sl->intra4x4_pred_mode_cache[scan8[0] - 1] == -1)

  724.                     sl->left_samples_available = 0x5F5F;

  725.             }

  726.             if (sl->mb_y > 0) {

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

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

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

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

  731. 

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

  733.                     sl->top_samples_available = 0x33FF;

  734.             }

  735. 

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

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

  738.                 vlc = svq3_get_ue_golomb(&h->gb);

  739. 

  740.                 if (vlc >= 25) {

  741.                     av_log(h->avctx, AV_LOG_ERROR,

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

  743.                     return -1;

  744.                 }

  745. 

  746.                 left = &sl->intra4x4_pred_mode_cache[scan8[i] - 1];

  747.                 top  = &sl->intra4x4_pred_mode_cache[scan8[i] - 8];

  748. 

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

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

  751. 

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

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

  754.                     return -1;

  755.                 }

  756.             }

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

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

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

  760.         }

  761. 

  762.         write_back_intra_pred_mode(h, sl);

  763. 

  764.         if (mb_type == 8) {

  765.             ff_h264_check_intra4x4_pred_mode(h, sl);

  766. 

  767.             sl->top_samples_available  = (sl->mb_y == 0) ? 0x33FF : 0xFFFF;

  768.             sl->left_samples_available = (sl->mb_x == 0) ? 0x5F5F : 0xFFFF;

  769.         } else {

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

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

  772. 

  773.             sl->top_samples_available  = 0x33FF;

  774.             sl->left_samples_available = 0x5F5F;

  775.         }

  776. 

  777.         mb_type = MB_TYPE_INTRA4x4;

  778.     } else {                      /* INTRA16x16 */

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

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

  781. 

  782.         if ((sl->intra16x16_pred_mode = ff_h264_check_intra_pred_mode(h, sl, dir, 0)) < 0) {

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

  784.             return sl->intra16x16_pred_mode;

  785.         }

  786. 

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

  788.         mb_type = MB_TYPE_INTRA16x16;

  789.     }

  790. 

  791.     if (!IS_INTER(mb_type) && h->pict_type != AV_PICTURE_TYPE_I) {

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

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

  794.                    0, 4 * 2 * sizeof(int16_t));

  795.         if (h->pict_type == AV_PICTURE_TYPE_B) {

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

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

  798.                        0, 4 * 2 * sizeof(int16_t));

  799.         }

  800.     }

  801.     if (!IS_INTRA4x4(mb_type)) {

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

  803.     }

  804.     if (!IS_SKIP(mb_type) || h->pict_type == AV_PICTURE_TYPE_B) {

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

  806.     }

  807. 

  808.     if (!IS_INTRA16x16(mb_type) &&

  809.         (!IS_SKIP(mb_type) || h->pict_type == AV_PICTURE_TYPE_B)) {

  810.         if ((vlc = svq3_get_ue_golomb(&h->gb)) >= 48) {

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

  812.             return -1;

  813.         }

  814. 

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

  816.                                 : ff_h264_golomb_to_inter_cbp[vlc];

  817.     }

  818.     if (IS_INTRA16x16(mb_type) ||

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

  820.         sl->qscale += svq3_get_se_golomb(&h->gb);

  821. 

  822.         if (sl->qscale > 31u) {

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

  824.             return -1;

  825.         }

  826.     }

  827.     if (IS_INTRA16x16(mb_type)) {

  828.         AV_ZERO128(sl->mb_luma_dc[0] + 0);

  829.         AV_ZERO128(sl->mb_luma_dc[0] + 8);

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

  831.             av_log(h->avctx, AV_LOG_ERROR,

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

  833.             return -1;

  834.         }

  835.     }

  836. 

  837.     if (cbp) {

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

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

  840. 

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

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

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

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

  845.                                  2 * (j & 2) + 4 * (i & 2))

  846.                               : (4 * i + j);

  847.                     sl->non_zero_count_cache[scan8[k]] = 1;

  848. 

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

  850.                         av_log(h->avctx, AV_LOG_ERROR,

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

  852.                         return -1;

  853.                     }

  854.                 }

  855.             }

  856. 

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

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

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

  860.                     av_log(h->avctx, AV_LOG_ERROR,

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

  862.                     return -1;

  863.                 }

  864. 

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

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

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

  868.                         k                                 = 16 * i + j;

  869.                         sl->non_zero_count_cache[scan8[k]] = 1;

  870. 

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

  872.                             av_log(h->avctx, AV_LOG_ERROR,

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

  874.                             return -1;

  875.                         }

  876.                     }

  877.                 }

  878.             }

  879.         }

  880.     }

  881. 

  882.     sl->cbp                   = cbp;

  883.     h->cur_pic.mb_type[mb_xy] = mb_type;

  884. 

  885.     if (IS_INTRA(mb_type))

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

  887. 

  888.     return 0;

  889. }

  890. 

  891. static int svq3_decode_slice_header(AVCodecContext *avctx)

  892. {

  893.     SVQ3Context *s = avctx->priv_data;

  894.     H264Context *h    = &s->h;

  895.     H264SliceContext *sl = &h->slice_ctx[0];

  896.     const int mb_xy   = sl->mb_xy;

  897.     int i, header;

  898.     unsigned slice_id;

  899. 

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

  901. 

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

  903.         /* TODO: what? */

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

  905.         return -1;

  906.     } else {

  907.         int slice_bits, slice_bytes, slice_length;

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

  909. 

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

  911.         slice_bits   = slice_length * 8;

  912.         slice_bytes  = slice_length + length - 1;

  913. 

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

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

  916.             return -1;

  917.         }

  918. 

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

  920. 

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

  922.         if (!s->slice_buf)

  923.             return AVERROR(ENOMEM);

  924. 

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

  926. 

  927.         init_get_bits(&h->gb, s->slice_buf, slice_bits);

  928. 

  929.         if (s->watermark_key) {

  930.             uint32_t header = AV_RL32(&h->gb.buffer[1]);

  931.             AV_WL32(&h->gb.buffer[1], header ^ s->watermark_key);

  932.         }

  933.         if (length > 0) {

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

  935.         }

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

  937.     }

  938. 

  939.     if ((slice_id = svq3_get_ue_golomb(&h->gb)) >= 3) {

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

  941.         return -1;

  942.     }

  943. 

  944.     sl->slice_type = ff_h264_golomb_to_pict_type[slice_id];

  945. 

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

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

  948.         sl->mb_skip_run = get_bits(&h->gb, i) -

  949.                          (sl->mb_y * h->mb_width + sl->mb_x);

  950.     } else {

  951.         skip_bits1(&h->gb);

  952.         sl->mb_skip_run = 0;

  953.     }

  954. 

  955.     sl->slice_num     = get_bits(&h->gb, 8);

  956.     sl->qscale        = get_bits(&h->gb, 5);

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

  958. 

  959.     /* unknown fields */

  960.     skip_bits1(&h->gb);

  961. 

  962.     if (s->unknown_flag)

  963.         skip_bits1(&h->gb);

  964. 

  965.     skip_bits1(&h->gb);

  966.     skip_bits(&h->gb, 2);

  967. 

  968.     while (get_bits1(&h->gb))

  969.         skip_bits(&h->gb, 8);

  970. 

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

  972.     if (sl->mb_x > 0) {

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

  974.                -1, 4 * sizeof(int8_t));

  975.         memset(sl->intra4x4_pred_mode + h->mb2br_xy[mb_xy - sl->mb_x],

  976.                -1, 8 * sizeof(int8_t) * sl->mb_x);

  977.     }

  978.     if (sl->mb_y > 0) {

  979.         memset(sl->intra4x4_pred_mode + h->mb2br_xy[mb_xy - h->mb_stride],

  980.                -1, 8 * sizeof(int8_t) * (h->mb_width - sl->mb_x));

  981. 

  982.         if (sl->mb_x > 0)

  983.             sl->intra4x4_pred_mode[h->mb2br_xy[mb_xy - h->mb_stride - 1] + 3] = -1;

  984.     }

  985. 

  986.     return 0;

  987. }

  988. 

  989. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  990. {

  991.     SVQ3Context *s = avctx->priv_data;

  992.     H264Context *h = &s->h;

  993.     H264SliceContext *sl;

  994.     int m;

  995.     unsigned char *extradata;

  996.     unsigned char *extradata_end;

  997.     unsigned int size;

  998.     int marker_found = 0;

  999. 

  1000.     s->cur_pic  = av_mallocz(sizeof(*s->cur_pic));

  1001.     s->last_pic = av_mallocz(sizeof(*s->last_pic));

  1002.     s->next_pic = av_mallocz(sizeof(*s->next_pic));

  1003.     if (!s->next_pic || !s->last_pic || !s->cur_pic) {

  1004.         av_freep(&s->cur_pic);

  1005.         av_freep(&s->last_pic);

  1006.         av_freep(&s->next_pic);

  1007.         return AVERROR(ENOMEM);

  1008.     }

  1009. 

  1010.     s->cur_pic->f  = av_frame_alloc();

  1011.     s->last_pic->f = av_frame_alloc();

  1012.     s->next_pic->f = av_frame_alloc();

  1013.     if (!s->cur_pic->f || !s->last_pic->f || !s->next_pic->f)

  1014.         return AVERROR(ENOMEM);

  1015. 

  1016.     if (ff_h264_decode_init(avctx) < 0)

  1017.         return -1;

  1018. 

  1019.     // we will overwrite it later during decoding

  1020.     av_frame_free(&h->cur_pic.f);

  1021. 

  1022.     ff_h264dsp_init(&s->h264dsp, 8, 1);

  1023.     ff_h264_pred_init(&s->hpc, AV_CODEC_ID_SVQ3, 8, 1);

  1024.     ff_videodsp_init(&s->vdsp, 8);

  1025. 

  1026.     memset(h->pps.scaling_matrix4, 16, 6 * 16 * sizeof(uint8_t));

  1027.     memset(h->pps.scaling_matrix8, 16, 2 * 64 * sizeof(uint8_t));

  1028. 

  1029.     h->sps.bit_depth_luma = 8;

  1030.     h->chroma_format_idc = 1;

  1031. 

  1032.     ff_hpeldsp_init(&s->hdsp, avctx->flags);

  1033.     ff_tpeldsp_init(&s->tdsp);

  1034. 

  1035.     sl = h->slice_ctx;

  1036. 

  1037.     h->flags           = avctx->flags;

  1038.     sl->is_complex     = 1;

  1039.     h->picture_structure = PICT_FRAME;

  1040.     avctx->pix_fmt     = AV_PIX_FMT_YUVJ420P;

  1041.     avctx->color_range = AVCOL_RANGE_JPEG;

  1042. 

  1043.     h->slice_ctx[0].chroma_qp[0] = h->slice_ctx[0].chroma_qp[1] = 4;

  1044.     h->chroma_x_shift = h->chroma_y_shift = 1;

  1045. 

  1046.     s->halfpel_flag  = 1;

  1047.     s->thirdpel_flag = 1;

  1048.     s->unknown_flag  = 0;

  1049. 

  1050.     /* prowl for the "SEQH" marker in the extradata */

  1051.     extradata     = (unsigned char *)avctx->extradata;

  1052.     extradata_end = avctx->extradata + avctx->extradata_size;

  1053.     if (extradata) {

  1054.         for (m = 0; m + 8 < avctx->extradata_size; m++) {

  1055.             if (!memcmp(extradata, "SEQH", 4)) {

  1056.                 marker_found = 1;

  1057.                 break;

  1058.             }

  1059.             extradata++;

  1060.         }

  1061.     }

  1062. 

  1063.     /* if a match was found, parse the extra data */

  1064.     if (marker_found) {

  1065.         GetBitContext gb;

  1066.         int frame_size_code;

  1067. 

  1068.         size = AV_RB32(&extradata[4]);

  1069.         if (size > extradata_end - extradata - 8)

  1070.             return AVERROR_INVALIDDATA;

  1071.         init_get_bits(&gb, extradata + 8, size * 8);

  1072. 

  1073.         /* 'frame size code' and optional 'width, height' */

  1074.         frame_size_code = get_bits(&gb, 3);

  1075.         switch (frame_size_code) {

  1076.         case 0:

  1077.             avctx->width  = 160;

  1078.             avctx->height = 120;

  1079.             break;

  1080.         case 1:

  1081.             avctx->width  = 128;

  1082.             avctx->height =  96;

  1083.             break;

  1084.         case 2:

  1085.             avctx->width  = 176;

  1086.             avctx->height = 144;

  1087.             break;

  1088.         case 3:

  1089.             avctx->width  = 352;

  1090.             avctx->height = 288;

  1091.             break;

  1092.         case 4:

  1093.             avctx->width  = 704;

  1094.             avctx->height = 576;

  1095.             break;

  1096.         case 5:

  1097.             avctx->width  = 240;

  1098.             avctx->height = 180;

  1099.             break;

  1100.         case 6:

  1101.             avctx->width  = 320;

  1102.             avctx->height = 240;

  1103.             break;

  1104.         case 7:

  1105.             avctx->width  = get_bits(&gb, 12);

  1106.             avctx->height = get_bits(&gb, 12);

  1107.             break;

  1108.         }

  1109. 

  1110.         s->halfpel_flag  = get_bits1(&gb);

  1111.         s->thirdpel_flag = get_bits1(&gb);

  1112. 

  1113.         /* unknown fields */

  1114.         skip_bits1(&gb);

  1115.         skip_bits1(&gb);

  1116.         skip_bits1(&gb);

  1117.         skip_bits1(&gb);

  1118. 

  1119.         h->low_delay = get_bits1(&gb);

  1120. 

  1121.         /* unknown field */

  1122.         skip_bits1(&gb);

  1123. 

  1124.         while (get_bits1(&gb))

  1125.             skip_bits(&gb, 8);

  1126. 

  1127.         s->unknown_flag  = get_bits1(&gb);

  1128.         avctx->has_b_frames = !h->low_delay;

  1129.         if (s->unknown_flag) {

  1130. #if CONFIG_ZLIB

  1131.             unsigned watermark_width  = svq3_get_ue_golomb(&gb);

  1132.             unsigned watermark_height = svq3_get_ue_golomb(&gb);

  1133.             int u1                    = svq3_get_ue_golomb(&gb);

  1134.             int u2                    = get_bits(&gb, 8);

  1135.             int u3                    = get_bits(&gb, 2);

  1136.             int u4                    = svq3_get_ue_golomb(&gb);

  1137.             unsigned long buf_len     = watermark_width *

  1138.                                         watermark_height * 4;

  1139.             int offset                = get_bits_count(&gb) + 7 >> 3;

  1140.             uint8_t *buf;

  1141. 

  1142.             if (watermark_height > 0 &&

  1143.                 (uint64_t)watermark_width * 4 > UINT_MAX / watermark_height)

  1144.                 return -1;

  1145. 

  1146.             buf = av_malloc(buf_len);

  1147.             av_log(avctx, AV_LOG_DEBUG, "watermark size: %ux%u\n",

  1148.                    watermark_width, watermark_height);

  1149.             av_log(avctx, AV_LOG_DEBUG,

  1150.                    "u1: %x u2: %x u3: %x compressed data size: %d offset: %d\n",

  1151.                    u1, u2, u3, u4, offset);

  1152.             if (uncompress(buf, &buf_len, extradata + 8 + offset,

  1153.                            size - offset) != Z_OK) {

  1154.                 av_log(avctx, AV_LOG_ERROR,

  1155.                        "could not uncompress watermark logo\n");

  1156.                 av_free(buf);

  1157.                 return -1;

  1158.             }

  1159.             s->watermark_key = ff_svq1_packet_checksum(buf, buf_len, 0);

  1160.             s->watermark_key = s->watermark_key << 16 | s->watermark_key;

  1161.             av_log(avctx, AV_LOG_DEBUG,

  1162.                    "watermark key %#"PRIx32"\n", s->watermark_key);

  1163.             av_free(buf);

  1164. #else

  1165.             av_log(avctx, AV_LOG_ERROR,

  1166.                    "this svq3 file contains watermark which need zlib support compiled in\n");

  1167.             return -1;

  1168. #endif

  1169.         }

  1170.     }

  1171. 

  1172.     h->width  = avctx->width;

  1173.     h->height = avctx->height;

  1174.     h->mb_width  = (h->width + 15) / 16;

  1175.     h->mb_height = (h->height + 15) / 16;

  1176.     h->mb_stride = h->mb_width + 1;

  1177.     h->mb_num    = h->mb_width * h->mb_height;

  1178.     h->b_stride = 4 * h->mb_width;

  1179.     s->h_edge_pos = h->mb_width * 16;

  1180.     s->v_edge_pos = h->mb_height * 16;

  1181. 

  1182.     if (ff_h264_alloc_tables(h) < 0) {

  1183.         av_log(avctx, AV_LOG_ERROR, "svq3 memory allocation failed\n");

  1184.         return AVERROR(ENOMEM);

  1185.     }

  1186. 

  1187.     return 0;

  1188. }

  1189. 

  1190. static void free_picture(AVCodecContext *avctx, H264Picture *pic)

  1191. {

  1192.     int i;

  1193.     for (i = 0; i < 2; i++) {

  1194.         av_buffer_unref(&pic->motion_val_buf[i]);

  1195.         av_buffer_unref(&pic->ref_index_buf[i]);

  1196.     }

  1197.     av_buffer_unref(&pic->mb_type_buf);

  1198. 

  1199.     av_frame_unref(pic->f);

  1200. }

  1201. 

  1202. static int get_buffer(AVCodecContext *avctx, H264Picture *pic)

  1203. {

  1204.     SVQ3Context *s = avctx->priv_data;

  1205.     H264Context *h = &s->h;

  1206.     H264SliceContext *sl = &h->slice_ctx[0];

  1207.     const int big_mb_num    = h->mb_stride * (h->mb_height + 1) + 1;

  1208.     const int mb_array_size = h->mb_stride * h->mb_height;

  1209.     const int b4_stride     = h->mb_width * 4 + 1;

  1210.     const int b4_array_size = b4_stride * h->mb_height * 4;

  1211.     int ret;

  1212. 

  1213.     if (!pic->motion_val_buf[0]) {

  1214.         int i;

  1215. 

  1216.         pic->mb_type_buf = av_buffer_allocz((big_mb_num + h->mb_stride) * sizeof(uint32_t));

  1217.         if (!pic->mb_type_buf)

  1218.             return AVERROR(ENOMEM);

  1219.         pic->mb_type = (uint32_t*)pic->mb_type_buf->data + 2 * h->mb_stride + 1;

  1220. 

  1221.         for (i = 0; i < 2; i++) {

  1222.             pic->motion_val_buf[i] = av_buffer_allocz(2 * (b4_array_size + 4) * sizeof(int16_t));

  1223.             pic->ref_index_buf[i]  = av_buffer_allocz(4 * mb_array_size);

  1224.             if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i]) {

  1225.                 ret = AVERROR(ENOMEM);

  1226.                 goto fail;

  1227.             }

  1228. 

  1229.             pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;

  1230.             pic->ref_index[i]  = pic->ref_index_buf[i]->data;

  1231.         }

  1232.     }

  1233.     pic->reference = !(h->pict_type == AV_PICTURE_TYPE_B);

  1234. 

  1235.     ret = ff_get_buffer(avctx, pic->f,

  1236.                         pic->reference ? AV_GET_BUFFER_FLAG_REF : 0);

  1237.     if (ret < 0)

  1238.         goto fail;

  1239. 

  1240.     if (!sl->edge_emu_buffer) {

  1241.         sl->edge_emu_buffer = av_mallocz(pic->f->linesize[0] * 17);

  1242.         if (!sl->edge_emu_buffer)

  1243.             return AVERROR(ENOMEM);

  1244.     }

  1245. 

  1246.     sl->linesize   = pic->f->linesize[0];

  1247.     sl->uvlinesize = pic->f->linesize[1];

  1248. 

  1249.     return 0;

  1250. fail:

  1251.     free_picture(avctx, pic);

  1252.     return ret;

  1253. }

  1254. 

  1255. static int svq3_decode_frame(AVCodecContext *avctx, void *data,

  1256.                              int *got_frame, AVPacket *avpkt)

  1257. {

  1258.     const uint8_t *buf = avpkt->data;

  1259.     SVQ3Context *s     = avctx->priv_data;

  1260.     H264Context *h     = &s->h;

  1261.     H264SliceContext *sl = &h->slice_ctx[0];

  1262.     int buf_size       = avpkt->size;

  1263.     int ret, m, i;

  1264. 

  1265.     /* special case for last picture */

  1266.     if (buf_size == 0) {

  1267.         if (s->next_pic->f->data[0] && !h->low_delay && !s->last_frame_output) {

  1268.             ret = av_frame_ref(data, s->next_pic->f);

  1269.             if (ret < 0)

  1270.                 return ret;

  1271.             s->last_frame_output = 1;

  1272.             *got_frame          = 1;

  1273.         }

  1274.         return 0;

  1275.     }

  1276. 

  1277.     ret = init_get_bits(&s->gb, buf, 8 * buf_size);

  1278.     if (ret < 0)

  1279.         return ret;

  1280. 

  1281.     sl->mb_x = sl->mb_y = sl->mb_xy = 0;

  1282. 

  1283.     if (svq3_decode_slice_header(avctx))

  1284.         return -1;

  1285. 

  1286.     h->pict_type = sl->slice_type;

  1287. 

  1288.     if (h->pict_type != AV_PICTURE_TYPE_B)

  1289.         FFSWAP(H264Picture*, s->next_pic, s->last_pic);

  1290. 

  1291.     av_frame_unref(s->cur_pic->f);

  1292. 

  1293.     /* for skipping the frame */

  1294.     s->cur_pic->f->pict_type = h->pict_type;

  1295.     s->cur_pic->f->key_frame = (h->pict_type == AV_PICTURE_TYPE_I);

  1296. 

  1297.     ret = get_buffer(avctx, s->cur_pic);

  1298.     if (ret < 0)

  1299.         return ret;

  1300. 

  1301.     h->cur_pic_ptr = s->cur_pic;

  1302.     h->cur_pic     = *s->cur_pic;

  1303. 

  1304.     for (i = 0; i < 16; i++) {

  1305.         h->block_offset[i]           = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * sl->linesize * ((scan8[i] - scan8[0]) >> 3);

  1306.         h->block_offset[48 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * sl->linesize * ((scan8[i] - scan8[0]) >> 3);

  1307.     }

  1308.     for (i = 0; i < 16; i++) {

  1309.         h->block_offset[16 + i]      =

  1310.         h->block_offset[32 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * sl->uvlinesize * ((scan8[i] - scan8[0]) >> 3);

  1311.         h->block_offset[48 + 16 + i] =

  1312.         h->block_offset[48 + 32 + i] = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * sl->uvlinesize * ((scan8[i] - scan8[0]) >> 3);

  1313.     }

  1314. 

  1315.     if (h->pict_type != AV_PICTURE_TYPE_I) {

  1316.         if (!s->last_pic->f->data[0]) {

  1317.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1318.             ret = get_buffer(avctx, s->last_pic);

  1319.             if (ret < 0)

  1320.                 return ret;

  1321.             memset(s->last_pic->f->data[0], 0, avctx->height * s->last_pic->f->linesize[0]);

  1322.             memset(s->last_pic->f->data[1], 0x80, (avctx->height / 2) *

  1323.                    s->last_pic->f->linesize[1]);

  1324.             memset(s->last_pic->f->data[2], 0x80, (avctx->height / 2) *

  1325.                    s->last_pic->f->linesize[2]);

  1326.         }

  1327. 

  1328.         if (h->pict_type == AV_PICTURE_TYPE_B && !s->next_pic->f->data[0]) {

  1329.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1330.             ret = get_buffer(avctx, s->next_pic);

  1331.             if (ret < 0)

  1332.                 return ret;

  1333.             memset(s->next_pic->f->data[0], 0, avctx->height * s->next_pic->f->linesize[0]);

  1334.             memset(s->next_pic->f->data[1], 0x80, (avctx->height / 2) *

  1335.                    s->next_pic->f->linesize[1]);

  1336.             memset(s->next_pic->f->data[2], 0x80, (avctx->height / 2) *

  1337.                    s->next_pic->f->linesize[2]);

  1338.         }

  1339.     }

  1340. 

  1341.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  1342.         av_log(h->avctx, AV_LOG_DEBUG,

  1343.                "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n",

  1344.                av_get_picture_type_char(h->pict_type),

  1345.                s->halfpel_flag, s->thirdpel_flag,

  1346.                s->adaptive_quant, h->slice_ctx[0].qscale, sl->slice_num);

  1347. 

  1348.     if (avctx->skip_frame >= AVDISCARD_NONREF && h->pict_type == AV_PICTURE_TYPE_B ||

  1349.         avctx->skip_frame >= AVDISCARD_NONKEY && h->pict_type != AV_PICTURE_TYPE_I ||

  1350.         avctx->skip_frame >= AVDISCARD_ALL)

  1351.         return 0;

  1352. 

  1353.     if (s->next_p_frame_damaged) {

  1354.         if (h->pict_type == AV_PICTURE_TYPE_B)

  1355.             return 0;

  1356.         else

  1357.             s->next_p_frame_damaged = 0;

  1358.     }

  1359. 

  1360.     if (h->pict_type == AV_PICTURE_TYPE_B) {

  1361.         h->frame_num_offset = sl->slice_num - h->prev_frame_num;

  1362. 

  1363.         if (h->frame_num_offset < 0)

  1364.             h->frame_num_offset += 256;

  1365.         if (h->frame_num_offset == 0 ||

  1366.             h->frame_num_offset >= h->prev_frame_num_offset) {

  1367.             av_log(h->avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  1368.             return -1;

  1369.         }

  1370.     } else {

  1371.         h->prev_frame_num        = h->frame_num;

  1372.         h->frame_num             = sl->slice_num;

  1373.         h->prev_frame_num_offset = h->frame_num - h->prev_frame_num;

  1374. 

  1375.         if (h->prev_frame_num_offset < 0)

  1376.             h->prev_frame_num_offset += 256;

  1377.     }

  1378. 

  1379.     for (m = 0; m < 2; m++) {

  1380.         int i;

  1381.         for (i = 0; i < 4; i++) {

  1382.             int j;

  1383.             for (j = -1; j < 4; j++)

  1384.                 sl->ref_cache[m][scan8[0] + 8 * i + j] = 1;

  1385.             if (i < 3)

  1386.                 sl->ref_cache[m][scan8[0] + 8 * i + j] = PART_NOT_AVAILABLE;

  1387.         }

  1388.     }

  1389. 

  1390.     for (sl->mb_y = 0; sl->mb_y < h->mb_height; sl->mb_y++) {

  1391.         for (sl->mb_x = 0; sl->mb_x < h->mb_width; sl->mb_x++) {

  1392.             unsigned mb_type;

  1393.             sl->mb_xy = sl->mb_x + sl->mb_y * h->mb_stride;

  1394. 

  1395.             if ((get_bits_left(&h->gb)) <= 7) {

  1396.                 if (((get_bits_count(&h->gb) & 7) == 0 ||

  1397.                     show_bits(&h->gb, get_bits_left(&h->gb) & 7) == 0)) {

  1398. 

  1399.                     if (svq3_decode_slice_header(avctx))

  1400.                         return -1;

  1401.                 }

  1402.                 /* TODO: support s->mb_skip_run */

  1403.             }

  1404. 

  1405.             mb_type = svq3_get_ue_golomb(&h->gb);

  1406. 

  1407.             if (h->pict_type == AV_PICTURE_TYPE_I)

  1408.                 mb_type += 8;

  1409.             else if (h->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4)

  1410.                 mb_type += 4;

  1411.             if (mb_type > 33 || svq3_decode_mb(s, mb_type)) {

  1412.                 av_log(h->avctx, AV_LOG_ERROR,

  1413.                        "error while decoding MB %d %d\n", sl->mb_x, sl->mb_y);

  1414.                 return -1;

  1415.             }

  1416. 

  1417.             if (mb_type != 0)

  1418.                 hl_decode_mb(s, h, &h->slice_ctx[0]);

  1419. 

  1420.             if (h->pict_type != AV_PICTURE_TYPE_B && !h->low_delay)

  1421.                 h->cur_pic.mb_type[sl->mb_x + sl->mb_y * h->mb_stride] =

  1422.                     (h->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1423.         }

  1424. 

  1425.         ff_draw_horiz_band(avctx, s->cur_pic->f,

  1426.                            s->last_pic->f->data[0] ? s->last_pic->f : NULL,

  1427.                            16 * sl->mb_y, 16, h->picture_structure, 0,

  1428.                            h->low_delay);

  1429.     }

  1430. 

  1431.     if (h->pict_type == AV_PICTURE_TYPE_B || h->low_delay)

  1432.         ret = av_frame_ref(data, s->cur_pic->f);

  1433.     else if (s->last_pic->f->data[0])

  1434.         ret = av_frame_ref(data, s->last_pic->f);

  1435.     if (ret < 0)

  1436.         return ret;

  1437. 

  1438.     /* Do not output the last pic after seeking. */

  1439.     if (s->last_pic->f->data[0] || h->low_delay)

  1440.         *got_frame = 1;

  1441. 

  1442.     if (h->pict_type != AV_PICTURE_TYPE_B) {

  1443.         FFSWAP(H264Picture*, s->cur_pic, s->next_pic);

  1444.     } else {

  1445.         av_frame_unref(s->cur_pic->f);

  1446.     }

  1447. 

  1448.     return buf_size;

  1449. }

  1450. 

  1451. static av_cold int svq3_decode_end(AVCodecContext *avctx)

  1452. {

  1453.     SVQ3Context *s = avctx->priv_data;

  1454.     H264Context *h = &s->h;

  1455. 

  1456.     free_picture(avctx, s->cur_pic);

  1457.     free_picture(avctx, s->next_pic);

  1458.     free_picture(avctx, s->last_pic);

  1459.     av_frame_free(&s->cur_pic->f);

  1460.     av_frame_free(&s->next_pic->f);

  1461.     av_frame_free(&s->last_pic->f);

  1462.     av_freep(&s->cur_pic);

  1463.     av_freep(&s->next_pic);

  1464.     av_freep(&s->last_pic);

  1465.     av_freep(&s->slice_buf);

  1466. 

  1467.     memset(&h->cur_pic, 0, sizeof(h->cur_pic));

  1468. 

  1469.     ff_h264_free_context(h);

  1470. 

  1471.     return 0;

  1472. }

  1473. 

  1474. AVCodec ff_svq3_decoder = {

  1475.     .name           = "svq3",

  1476.     .long_name      = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1477.     .type           = AVMEDIA_TYPE_VIDEO,

  1478.     .id             = AV_CODEC_ID_SVQ3,

  1479.     .priv_data_size = sizeof(SVQ3Context),

  1480.     .init           = svq3_decode_init,

  1481.     .close          = svq3_decode_end,

  1482.     .decode         = svq3_decode_frame,

  1483.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND |

  1484.                       AV_CODEC_CAP_DR1             |

  1485.                       AV_CODEC_CAP_DELAY,

  1486.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P,

  1487.                                                      AV_PIX_FMT_NONE},

  1488. };