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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. 

  51. #include "h264data.h" // FIXME FIXME FIXME

  52. 

  53. #include "h264_mvpred.h"

  54. #include "golomb.h"

  55. #include "hpeldsp.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. #include "svq3.h"

  65. 

  66. /**

  67.  * @file

  68.  * svq3 decoder.

  69.  */

  70. 

  71. typedef struct SVQ3Context {

  72.     H264Context h;

  73.     HpelDSPContext hdsp;

  74.     TpelDSPContext tdsp;

  75.     H264Picture *cur_pic;

  76.     H264Picture *next_pic;

  77.     H264Picture *last_pic;

  78.     GetBitContext gb;

  79.     uint8_t *slice_buf;

  80.     int slice_size;

  81.     int halfpel_flag;

  82.     int thirdpel_flag;

  83.     int unknown_flag;

  84.     uint32_t watermark_key;

  85.     int adaptive_quant;

  86.     int next_p_frame_damaged;

  87.     int h_edge_pos;

  88.     int v_edge_pos;

  89.     int last_frame_output;

  90. } SVQ3Context;

  91. 

  92. #define FULLPEL_MODE  1

  93. #define HALFPEL_MODE  2

  94. #define THIRDPEL_MODE 3

  95. #define PREDICT_MODE  4

  96. 

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

  98.  * o-->o-->o   o

  99.  *         |  /|

  100.  * o   o   o / o

  101.  * | / |   |/  |

  102.  * o   o   o   o

  103.  *   /

  104.  * o-->o-->o-->o

  105.  */

  106. static const uint8_t svq3_scan[16] = {

  107.     0 + 0 * 4, 1 + 0 * 4, 2 + 0 * 4, 2 + 1 * 4,

  108.     2 + 2 * 4, 3 + 0 * 4, 3 + 1 * 4, 3 + 2 * 4,

  109.     0 + 1 * 4, 0 + 2 * 4, 1 + 1 * 4, 1 + 2 * 4,

  110.     0 + 3 * 4, 1 + 3 * 4, 2 + 3 * 4, 3 + 3 * 4,

  111. };

  112. 

  113. static const uint8_t luma_dc_zigzag_scan[16] = {

  114.     0 * 16 + 0 * 64, 1 * 16 + 0 * 64, 2 * 16 + 0 * 64, 0 * 16 + 2 * 64,

  115.     3 * 16 + 0 * 64, 0 * 16 + 1 * 64, 1 * 16 + 1 * 64, 2 * 16 + 1 * 64,

  116.     1 * 16 + 2 * 64, 2 * 16 + 2 * 64, 3 * 16 + 2 * 64, 0 * 16 + 3 * 64,

  117.     3 * 16 + 1 * 64, 1 * 16 + 3 * 64, 2 * 16 + 3 * 64, 3 * 16 + 3 * 64,

  118. };

  119. 

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

  121.     { 0, 0 },

  122.     { 1, 0 }, { 0, 1 },

  123.     { 0, 2 }, { 1, 1 }, { 2, 0 },

  124.     { 3, 0 }, { 2, 1 }, { 1, 2 }, { 0, 3 },

  125.     { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

  126.     { 4, 1 }, { 3, 2 }, { 2, 3 }, { 1, 4 },

  127.     { 2, 4 }, { 3, 3 }, { 4, 2 },

  128.     { 4, 3 }, { 3, 4 },

  129.     { 4, 4 }

  130. };

  131. 

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

  133.     { { 2, -1, -1, -1, -1 }, { 2, 1, -1, -1, -1 }, { 1, 2, -1, -1, -1 },

  134.       { 2,  1, -1, -1, -1 }, { 1, 2, -1, -1, -1 }, { 1, 2, -1, -1, -1 } },

  135.     { { 0,  2, -1, -1, -1 }, { 0, 2,  1,  4,  3 }, { 0, 1,  2,  4,  3 },

  136.       { 0,  2,  1,  4,  3 }, { 2, 0,  1,  3,  4 }, { 0, 4,  2,  1,  3 } },

  137.     { { 2,  0, -1, -1, -1 }, { 2, 1,  0,  4,  3 }, { 1, 2,  4,  0,  3 },

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

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

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

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

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

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

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

  145. };

  146. 

  147. static const struct {

  148.     uint8_t run;

  149.     uint8_t level;

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

  151.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  152.       { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  153.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  154.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  155. };

  156. 

  157. static const uint32_t svq3_dequant_coeff[32] = {

  158.      3881,  4351,  4890,  5481,   6154,   6914,   7761,   8718,

  159.      9781, 10987, 12339, 13828,  15523,  17435,  19561,  21873,

  160.     24552, 27656, 30847, 34870,  38807,  43747,  49103,  54683,

  161.     61694, 68745, 77615, 89113, 100253, 109366, 126635, 141533

  162. };

  163. 

  164. void ff_svq3_luma_dc_dequant_idct_c(int16_t *output, int16_t *input, int qp)

  165. {

  166.     const int qmul = svq3_dequant_coeff[qp];

  167. #define stride 16

  168.     int i;

  169.     int temp[16];

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

  171. 

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

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

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

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

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

  177. 

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

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

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

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

  182.     }

  183. 

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

  185.         const int offset = x_offset[i];

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

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

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

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

  190. 

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

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

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

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

  195.     }

  196. }

  197. #undef stride

  198. 

  199. void ff_svq3_add_idct_c(uint8_t *dst, int16_t *block,

  200.                         int stride, int qp, int dc)

  201. {

  202.     const int qmul = svq3_dequant_coeff[qp];

  203.     int i;

  204. 

  205.     if (dc) {

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

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

  208.         block[0] = 0;

  209.     }

  210. 

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

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

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

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

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

  216. 

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

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

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

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

  221.     }

  222. 

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

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

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

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

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

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

  229. 

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

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

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

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

  234.     }

  235. 

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

  237. }

  238. 

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

  240.                                     int index, const int type)

  241. {

  242.     static const uint8_t *const scan_patterns[4] =

  243.     { luma_dc_zigzag_scan, zigzag_scan, svq3_scan, chroma_dc_scan };

  244. 

  245.     int run, level, limit;

  246.     unsigned vlc;

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

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

  249. 

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

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

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

  253.             vlc      = vlc + 1 >> 1;

  254. 

  255.             if (type == 3) {

  256.                 if (vlc < 3) {

  257.                     run   = 0;

  258.                     level = vlc;

  259.                 } else if (vlc < 4) {

  260.                     run   = 1;

  261.                     level = 1;

  262.                 } else {

  263.                     run   = vlc & 0x3;

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

  265.                 }

  266.             } else {

  267.                 if (vlc < 16) {

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

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

  270.                 } else if (intra) {

  271.                     run   = vlc & 0x7;

  272.                     level = (vlc >> 3) +

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

  274.                 } else {

  275.                     run   = vlc & 0xF;

  276.                     level = (vlc >> 4) +

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

  278.                 }

  279.             }

  280. 

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

  282.                 return -1;

  283. 

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

  285.         }

  286. 

  287.         if (type != 2) {

  288.             break;

  289.         }

  290.     }

  291. 

  292.     return 0;

  293. }

  294. 

  295. static inline void svq3_mc_dir_part(SVQ3Context *s,

  296.                                     int x, int y, int width, int height,

  297.                                     int mx, int my, int dxy,

  298.                                     int thirdpel, int dir, int avg)

  299. {

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

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

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

  303.     uint8_t *src, *dest;

  304.     int i, emu = 0;

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

  306. 

  307.     mx += x;

  308.     my += y;

  309. 

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

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

  312.         emu = 1;

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

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

  315.     }

  316. 

  317.     /* form component predictions */

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

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

  320. 

  321.     if (emu) {

  322.         h->vdsp.emulated_edge_mc(sl->edge_emu_buffer, src,

  323.                                  sl->linesize, sl->linesize,

  324.                                  width + 1, height + 1,

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

  326.         src = sl->edge_emu_buffer;

  327.     }

  328.     if (thirdpel)

  329.         (avg ? s->tdsp.avg_tpel_pixels_tab

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

  331.                                                  width, height);

  332.     else

  333.         (avg ? s->hdsp.avg_pixels_tab

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

  335.                                                        height);

  336. 

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

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

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

  340.         width  = width  >> 1;

  341.         height = height >> 1;

  342.         blocksize++;

  343. 

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

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

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

  347. 

  348.             if (emu) {

  349.                 h->vdsp.emulated_edge_mc(sl->edge_emu_buffer, src,

  350.                                          sl->uvlinesize, sl->uvlinesize,

  351.                                          width + 1, height + 1,

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

  353.                                          s->v_edge_pos >> 1);

  354.                 src = sl->edge_emu_buffer;

  355.             }

  356.             if (thirdpel)

  357.                 (avg ? s->tdsp.avg_tpel_pixels_tab

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

  359.                                                          sl->uvlinesize,

  360.                                                          width, height);

  361.             else

  362.                 (avg ? s->hdsp.avg_pixels_tab

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

  364.                                                                sl->uvlinesize,

  365.                                                                height);

  366.         }

  367.     }

  368. }

  369. 

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

  371.                               int dir, int avg)

  372. {

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

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

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

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

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

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

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

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

  381. 

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

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

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

  385.                              (4 * sl->mb_y + (i >> 2)) * h->b_stride;

  386.             int dxy;

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

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

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

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

  391. 

  392.             if (mode != PREDICT_MODE) {

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

  394.             } else {

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

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

  397. 

  398.                 if (dir == 0) {

  399.                     mx = mx * h->frame_num_offset /

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

  401.                     my = my * h->frame_num_offset /

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

  403.                 } else {

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

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

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

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

  408.                 }

  409.             }

  410. 

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

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

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

  414. 

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

  416.             if (mode == PREDICT_MODE) {

  417.                 dx = dy = 0;

  418.             } else {

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

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

  421. 

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

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

  424.                     return -1;

  425.                 }

  426.             }

  427. 

  428.             /* compute motion vector */

  429.             if (mode == THIRDPEL_MODE) {

  430.                 int fx, fy;

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

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

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

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

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

  436. 

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

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

  439.                 mx += mx;

  440.                 my += my;

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

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

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

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

  445. 

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

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

  448.                 mx *= 3;

  449.                 my *= 3;

  450.             } else {

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

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

  453. 

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

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

  456.                 mx *= 6;

  457.                 my *= 6;

  458.             }

  459. 

  460.             /* update mv_cache */

  461.             if (mode != PREDICT_MODE) {

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

  463. 

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

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

  466. 

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

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

  469.                 }

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

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

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

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

  474.             }

  475. 

  476.             /* write back motion vectors */

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

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

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

  480.         }

  481. 

  482.     return 0;

  483. }

  484. 

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

  486. {

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

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

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

  490.     int cbp = 0;

  491.     uint32_t vlc;

  492.     int8_t *top, *left;

  493.     const int mb_xy         = sl->mb_xy;

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

  495. 

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

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

  498.     sl->topright_samples_available = 0xFFFF;

  499. 

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

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

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

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

  504.                              0, 0, 0, 0, 0, 0);

  505. 

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

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

  508.                                  0, 0, 0, 0, 1, 1);

  509. 

  510.             mb_type = MB_TYPE_SKIP;

  511.         } else {

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

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

  514.                 return -1;

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

  516.                 return -1;

  517. 

  518.             mb_type = MB_TYPE_16x16;

  519.         }

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

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

  522.             mode = THIRDPEL_MODE;

  523.         else if (s->halfpel_flag &&

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

  525.             mode = HALFPEL_MODE;

  526.         else

  527.             mode = FULLPEL_MODE;

  528. 

  529.         /* fill caches */

  530.         /* note ref_cache should contain here:

  531.          *  ????????

  532.          *  ???11111

  533.          *  N??11111

  534.          *  N??11111

  535.          *  N??11111

  536.          */

  537. 

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

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

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

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

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

  543.             } else {

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

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

  546.             }

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

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

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

  550.                        4 * 2 * sizeof(int16_t));

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

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

  553. 

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

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

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

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

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

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

  560.                 } else

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

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

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

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

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

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

  567.                 } else

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

  569.             } else

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

  571.                        PART_NOT_AVAILABLE, 8);

  572. 

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

  574.                 break;

  575.         }

  576. 

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

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

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

  580.                 return -1;

  581.         } else {        /* AV_PICTURE_TYPE_B */

  582.             if (mb_type != 2) {

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

  584.                     return -1;

  585.             } else {

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

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

  588.                            0, 4 * 2 * sizeof(int16_t));

  589.             }

  590.             if (mb_type != 1) {

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

  592.                     return -1;

  593.             } else {

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

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

  596.                            0, 4 * 2 * sizeof(int16_t));

  597.             }

  598.         }

  599. 

  600.         mb_type = MB_TYPE_16x16;

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

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

  603. 

  604.         if (mb_type == 8) {

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

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

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

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

  609.                     sl->left_samples_available = 0x5F5F;

  610.             }

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

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

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

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

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

  616. 

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

  618.                     sl->top_samples_available = 0x33FF;

  619.             }

  620. 

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

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

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

  624. 

  625.                 if (vlc >= 25) {

  626.                     av_log(h->avctx, AV_LOG_ERROR,

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

  628.                     return -1;

  629.                 }

  630. 

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

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

  633. 

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

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

  636. 

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

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

  639.                     return -1;

  640.                 }

  641.             }

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

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

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

  645.         }

  646. 

  647.         write_back_intra_pred_mode(h, sl);

  648. 

  649.         if (mb_type == 8) {

  650.             ff_h264_check_intra4x4_pred_mode(h, sl);

  651. 

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

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

  654.         } else {

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

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

  657. 

  658.             sl->top_samples_available  = 0x33FF;

  659.             sl->left_samples_available = 0x5F5F;

  660.         }

  661. 

  662.         mb_type = MB_TYPE_INTRA4x4;

  663.     } else {                      /* INTRA16x16 */

  664.         dir = i_mb_type_info[mb_type - 8].pred_mode;

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

  666. 

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

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

  669.             return sl->intra16x16_pred_mode;

  670.         }

  671. 

  672.         cbp     = i_mb_type_info[mb_type - 8].cbp;

  673.         mb_type = MB_TYPE_INTRA16x16;

  674.     }

  675. 

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

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

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

  679.                    0, 4 * 2 * sizeof(int16_t));

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

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

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

  683.                        0, 4 * 2 * sizeof(int16_t));

  684.         }

  685.     }

  686.     if (!IS_INTRA4x4(mb_type)) {

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

  688.     }

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

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

  691.     }

  692. 

  693.     if (!IS_INTRA16x16(mb_type) &&

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

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

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

  697.             return -1;

  698.         }

  699. 

  700.         cbp = IS_INTRA(mb_type) ? golomb_to_intra4x4_cbp[vlc]

  701.                                 : golomb_to_inter_cbp[vlc];

  702.     }

  703.     if (IS_INTRA16x16(mb_type) ||

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

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

  706. 

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

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

  709.             return -1;

  710.         }

  711.     }

  712.     if (IS_INTRA16x16(mb_type)) {

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

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

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

  716.             av_log(h->avctx, AV_LOG_ERROR,

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

  718.             return -1;

  719.         }

  720.     }

  721. 

  722.     if (cbp) {

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

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

  725. 

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

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

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

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

  730.                                  2 * (j & 2) + 4 * (i & 2))

  731.                               : (4 * i + j);

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

  733. 

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

  735.                         av_log(h->avctx, AV_LOG_ERROR,

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

  737.                         return -1;

  738.                     }

  739.                 }

  740.             }

  741. 

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

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

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

  745.                     av_log(h->avctx, AV_LOG_ERROR,

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

  747.                     return -1;

  748.                 }

  749. 

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

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

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

  753.                         k                                 = 16 * i + j;

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

  755. 

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

  757.                             av_log(h->avctx, AV_LOG_ERROR,

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

  759.                             return -1;

  760.                         }

  761.                     }

  762.                 }

  763.             }

  764.         }

  765.     }

  766. 

  767.     sl->cbp                   = cbp;

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

  769. 

  770.     if (IS_INTRA(mb_type))

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

  772. 

  773.     return 0;

  774. }

  775. 

  776. static int svq3_decode_slice_header(AVCodecContext *avctx)

  777. {

  778.     SVQ3Context *s = avctx->priv_data;

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

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

  781.     const int mb_xy   = sl->mb_xy;

  782.     int i, header;

  783.     unsigned slice_id;

  784. 

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

  786. 

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

  788.         /* TODO: what? */

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

  790.         return -1;

  791.     } else {

  792.         int slice_bits, slice_bytes, slice_length;

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

  794. 

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

  796.         slice_bits   = slice_length * 8;

  797.         slice_bytes  = slice_length + length - 1;

  798. 

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

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

  801.             return -1;

  802.         }

  803. 

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

  805. 

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

  807.         if (!s->slice_buf)

  808.             return AVERROR(ENOMEM);

  809. 

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

  811. 

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

  813. 

  814.         if (s->watermark_key) {

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

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

  817.         }

  818.         if (length > 0) {

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

  820.         }

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

  822.     }

  823. 

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

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

  826.         return -1;

  827.     }

  828. 

  829.     sl->slice_type = golomb_to_pict_type[slice_id];

  830. 

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

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

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

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

  835.     } else {

  836.         skip_bits1(&h->gb);

  837.         sl->mb_skip_run = 0;

  838.     }

  839. 

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

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

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

  843. 

  844.     /* unknown fields */

  845.     skip_bits1(&h->gb);

  846. 

  847.     if (s->unknown_flag)

  848.         skip_bits1(&h->gb);

  849. 

  850.     skip_bits1(&h->gb);

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

  852. 

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

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

  855. 

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

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

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

  859.                -1, 4 * sizeof(int8_t));

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

  861.                -1, 8 * sizeof(int8_t) * sl->mb_x);

  862.     }

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

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

  865.                -1, 8 * sizeof(int8_t) * (h->mb_width - sl->mb_x));

  866. 

  867.         if (sl->mb_x > 0)

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

  869.     }

  870. 

  871.     return 0;

  872. }

  873. 

  874. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  875. {

  876.     SVQ3Context *s = avctx->priv_data;

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

  878.     H264SliceContext *sl;

  879.     int m;

  880.     unsigned char *extradata;

  881.     unsigned char *extradata_end;

  882.     unsigned int size;

  883.     int marker_found = 0;

  884. 

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

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

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

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

  889.         av_freep(&s->cur_pic);

  890.         av_freep(&s->last_pic);

  891.         av_freep(&s->next_pic);

  892.         return AVERROR(ENOMEM);

  893.     }

  894. 

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

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

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

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

  899.         return AVERROR(ENOMEM);

  900. 

  901.     if (ff_h264_decode_init(avctx) < 0)

  902.         return -1;

  903. 

  904.     // we will overwrite it later during decoding

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

  906. 

  907.     ff_h264dsp_init(&h->h264dsp, 8, 1);

  908.     ff_h264chroma_init(&h->h264chroma, 8);

  909.     ff_h264qpel_init(&h->h264qpel, 8);

  910.     ff_h264_pred_init(&h->hpc, AV_CODEC_ID_SVQ3, 8, 1);

  911.     ff_videodsp_init(&h->vdsp, 8);

  912. 

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

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

  915. 

  916.     h->sps.bit_depth_luma = 8;

  917.     h->chroma_format_idc = 1;

  918. 

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

  920.     ff_tpeldsp_init(&s->tdsp);

  921. 

  922.     sl = h->slice_ctx;

  923. 

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

  925.     sl->is_complex     = 1;

  926.     h->picture_structure = PICT_FRAME;

  927.     avctx->pix_fmt     = AV_PIX_FMT_YUVJ420P;

  928.     avctx->color_range = AVCOL_RANGE_JPEG;

  929. 

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

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

  932. 

  933.     s->halfpel_flag  = 1;

  934.     s->thirdpel_flag = 1;

  935.     s->unknown_flag  = 0;

  936. 

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

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

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

  940.     if (extradata) {

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

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

  943.                 marker_found = 1;

  944.                 break;

  945.             }

  946.             extradata++;

  947.         }

  948.     }

  949. 

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

  951.     if (marker_found) {

  952.         GetBitContext gb;

  953.         int frame_size_code;

  954. 

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

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

  957.             return AVERROR_INVALIDDATA;

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

  959. 

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

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

  962.         switch (frame_size_code) {

  963.         case 0:

  964.             avctx->width  = 160;

  965.             avctx->height = 120;

  966.             break;

  967.         case 1:

  968.             avctx->width  = 128;

  969.             avctx->height =  96;

  970.             break;

  971.         case 2:

  972.             avctx->width  = 176;

  973.             avctx->height = 144;

  974.             break;

  975.         case 3:

  976.             avctx->width  = 352;

  977.             avctx->height = 288;

  978.             break;

  979.         case 4:

  980.             avctx->width  = 704;

  981.             avctx->height = 576;

  982.             break;

  983.         case 5:

  984.             avctx->width  = 240;

  985.             avctx->height = 180;

  986.             break;

  987.         case 6:

  988.             avctx->width  = 320;

  989.             avctx->height = 240;

  990.             break;

  991.         case 7:

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

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

  994.             break;

  995.         }

  996. 

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

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

  999. 

  1000.         /* unknown fields */

  1001.         skip_bits1(&gb);

  1002.         skip_bits1(&gb);

  1003.         skip_bits1(&gb);

  1004.         skip_bits1(&gb);

  1005. 

  1006.         h->low_delay = get_bits1(&gb);

  1007. 

  1008.         /* unknown field */

  1009.         skip_bits1(&gb);

  1010. 

  1011.         while (get_bits1(&gb))

  1012.             skip_bits(&gb, 8);

  1013. 

  1014.         s->unknown_flag  = get_bits1(&gb);

  1015.         avctx->has_b_frames = !h->low_delay;

  1016.         if (s->unknown_flag) {

  1017. #if CONFIG_ZLIB

  1018.             unsigned watermark_width  = svq3_get_ue_golomb(&gb);

  1019.             unsigned watermark_height = svq3_get_ue_golomb(&gb);

  1020.             int u1                    = svq3_get_ue_golomb(&gb);

  1021.             int u2                    = get_bits(&gb, 8);

  1022.             int u3                    = get_bits(&gb, 2);

  1023.             int u4                    = svq3_get_ue_golomb(&gb);

  1024.             unsigned long buf_len     = watermark_width *

  1025.                                         watermark_height * 4;

  1026.             int offset                = get_bits_count(&gb) + 7 >> 3;

  1027.             uint8_t *buf;

  1028. 

  1029.             if (watermark_height > 0 &&

  1030.                 (uint64_t)watermark_width * 4 > UINT_MAX / watermark_height)

  1031.                 return -1;

  1032. 

  1033.             buf = av_malloc(buf_len);

  1034.             av_log(avctx, AV_LOG_DEBUG, "watermark size: %ux%u\n",

  1035.                    watermark_width, watermark_height);

  1036.             av_log(avctx, AV_LOG_DEBUG,

  1037.                    "u1: %x u2: %x u3: %x compressed data size: %d offset: %d\n",

  1038.                    u1, u2, u3, u4, offset);

  1039.             if (uncompress(buf, &buf_len, extradata + 8 + offset,

  1040.                            size - offset) != Z_OK) {

  1041.                 av_log(avctx, AV_LOG_ERROR,

  1042.                        "could not uncompress watermark logo\n");

  1043.                 av_free(buf);

  1044.                 return -1;

  1045.             }

  1046.             s->watermark_key = ff_svq1_packet_checksum(buf, buf_len, 0);

  1047.             s->watermark_key = s->watermark_key << 16 | s->watermark_key;

  1048.             av_log(avctx, AV_LOG_DEBUG,

  1049.                    "watermark key %#"PRIx32"\n", s->watermark_key);

  1050.             av_free(buf);

  1051. #else

  1052.             av_log(avctx, AV_LOG_ERROR,

  1053.                    "this svq3 file contains watermark which need zlib support compiled in\n");

  1054.             return -1;

  1055. #endif

  1056.         }

  1057.     }

  1058. 

  1059.     h->width  = avctx->width;

  1060.     h->height = avctx->height;

  1061.     h->mb_width  = (h->width + 15) / 16;

  1062.     h->mb_height = (h->height + 15) / 16;

  1063.     h->mb_stride = h->mb_width + 1;

  1064.     h->mb_num    = h->mb_width * h->mb_height;

  1065.     h->b_stride = 4 * h->mb_width;

  1066.     s->h_edge_pos = h->mb_width * 16;

  1067.     s->v_edge_pos = h->mb_height * 16;

  1068. 

  1069.     if (ff_h264_alloc_tables(h) < 0) {

  1070.         av_log(avctx, AV_LOG_ERROR, "svq3 memory allocation failed\n");

  1071.         return AVERROR(ENOMEM);

  1072.     }

  1073. 

  1074.     return 0;

  1075. }

  1076. 

  1077. static void free_picture(AVCodecContext *avctx, H264Picture *pic)

  1078. {

  1079.     int i;

  1080.     for (i = 0; i < 2; i++) {

  1081.         av_buffer_unref(&pic->motion_val_buf[i]);

  1082.         av_buffer_unref(&pic->ref_index_buf[i]);

  1083.     }

  1084.     av_buffer_unref(&pic->mb_type_buf);

  1085. 

  1086.     av_frame_unref(pic->f);

  1087. }

  1088. 

  1089. static int get_buffer(AVCodecContext *avctx, H264Picture *pic)

  1090. {

  1091.     SVQ3Context *s = avctx->priv_data;

  1092.     H264Context *h = &s->h;

  1093.     H264SliceContext *sl = &h->slice_ctx[0];

  1094.     const int big_mb_num    = h->mb_stride * (h->mb_height + 1) + 1;

  1095.     const int mb_array_size = h->mb_stride * h->mb_height;

  1096.     const int b4_stride     = h->mb_width * 4 + 1;

  1097.     const int b4_array_size = b4_stride * h->mb_height * 4;

  1098.     int ret;

  1099. 

  1100.     if (!pic->motion_val_buf[0]) {

  1101.         int i;

  1102. 

  1103.         pic->mb_type_buf = av_buffer_allocz((big_mb_num + h->mb_stride) * sizeof(uint32_t));

  1104.         if (!pic->mb_type_buf)

  1105.             return AVERROR(ENOMEM);

  1106.         pic->mb_type = (uint32_t*)pic->mb_type_buf->data + 2 * h->mb_stride + 1;

  1107. 

  1108.         for (i = 0; i < 2; i++) {

  1109.             pic->motion_val_buf[i] = av_buffer_allocz(2 * (b4_array_size + 4) * sizeof(int16_t));

  1110.             pic->ref_index_buf[i]  = av_buffer_allocz(4 * mb_array_size);

  1111.             if (!pic->motion_val_buf[i] || !pic->ref_index_buf[i]) {

  1112.                 ret = AVERROR(ENOMEM);

  1113.                 goto fail;

  1114.             }

  1115. 

  1116.             pic->motion_val[i] = (int16_t (*)[2])pic->motion_val_buf[i]->data + 4;

  1117.             pic->ref_index[i]  = pic->ref_index_buf[i]->data;

  1118.         }

  1119.     }

  1120.     pic->reference = !(h->pict_type == AV_PICTURE_TYPE_B);

  1121. 

  1122.     ret = ff_get_buffer(avctx, pic->f,

  1123.                         pic->reference ? AV_GET_BUFFER_FLAG_REF : 0);

  1124.     if (ret < 0)

  1125.         goto fail;

  1126. 

  1127.     if (!sl->edge_emu_buffer) {

  1128.         sl->edge_emu_buffer = av_mallocz(pic->f->linesize[0] * 17);

  1129.         if (!sl->edge_emu_buffer)

  1130.             return AVERROR(ENOMEM);

  1131.     }

  1132. 

  1133.     sl->linesize   = pic->f->linesize[0];

  1134.     sl->uvlinesize = pic->f->linesize[1];

  1135. 

  1136.     return 0;

  1137. fail:

  1138.     free_picture(avctx, pic);

  1139.     return ret;

  1140. }

  1141. 

  1142. static int svq3_decode_frame(AVCodecContext *avctx, void *data,

  1143.                              int *got_frame, AVPacket *avpkt)

  1144. {

  1145.     const uint8_t *buf = avpkt->data;

  1146.     SVQ3Context *s     = avctx->priv_data;

  1147.     H264Context *h     = &s->h;

  1148.     H264SliceContext *sl = &h->slice_ctx[0];

  1149.     int buf_size       = avpkt->size;

  1150.     int ret, m, i;

  1151. 

  1152.     /* special case for last picture */

  1153.     if (buf_size == 0) {

  1154.         if (s->next_pic->f->data[0] && !h->low_delay && !s->last_frame_output) {

  1155.             ret = av_frame_ref(data, s->next_pic->f);

  1156.             if (ret < 0)

  1157.                 return ret;

  1158.             s->last_frame_output = 1;

  1159.             *got_frame          = 1;

  1160.         }

  1161.         return 0;

  1162.     }

  1163. 

  1164.     ret = init_get_bits(&s->gb, buf, 8 * buf_size);

  1165.     if (ret < 0)

  1166.         return ret;

  1167. 

  1168.     sl->mb_x = sl->mb_y = sl->mb_xy = 0;

  1169. 

  1170.     if (svq3_decode_slice_header(avctx))

  1171.         return -1;

  1172. 

  1173.     h->pict_type = sl->slice_type;

  1174. 

  1175.     if (h->pict_type != AV_PICTURE_TYPE_B)

  1176.         FFSWAP(H264Picture*, s->next_pic, s->last_pic);

  1177. 

  1178.     av_frame_unref(s->cur_pic->f);

  1179. 

  1180.     /* for skipping the frame */

  1181.     s->cur_pic->f->pict_type = h->pict_type;

  1182.     s->cur_pic->f->key_frame = (h->pict_type == AV_PICTURE_TYPE_I);

  1183. 

  1184.     ret = get_buffer(avctx, s->cur_pic);

  1185.     if (ret < 0)

  1186.         return ret;

  1187. 

  1188.     h->cur_pic_ptr = s->cur_pic;

  1189.     h->cur_pic     = *s->cur_pic;

  1190. 

  1191.     for (i = 0; i < 16; i++) {

  1192.         h->block_offset[i]           = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * sl->linesize * ((scan8[i] - scan8[0]) >> 3);

  1193.         h->block_offset[48 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * sl->linesize * ((scan8[i] - scan8[0]) >> 3);

  1194.     }

  1195.     for (i = 0; i < 16; i++) {

  1196.         h->block_offset[16 + i]      =

  1197.         h->block_offset[32 + i]      = (4 * ((scan8[i] - scan8[0]) & 7)) + 4 * sl->uvlinesize * ((scan8[i] - scan8[0]) >> 3);

  1198.         h->block_offset[48 + 16 + i] =

  1199.         h->block_offset[48 + 32 + i] = (4 * ((scan8[i] - scan8[0]) & 7)) + 8 * sl->uvlinesize * ((scan8[i] - scan8[0]) >> 3);

  1200.     }

  1201. 

  1202.     if (h->pict_type != AV_PICTURE_TYPE_I) {

  1203.         if (!s->last_pic->f->data[0]) {

  1204.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1205.             ret = get_buffer(avctx, s->last_pic);

  1206.             if (ret < 0)

  1207.                 return ret;

  1208.             memset(s->last_pic->f->data[0], 0, avctx->height * s->last_pic->f->linesize[0]);

  1209.             memset(s->last_pic->f->data[1], 0x80, (avctx->height / 2) *

  1210.                    s->last_pic->f->linesize[1]);

  1211.             memset(s->last_pic->f->data[2], 0x80, (avctx->height / 2) *

  1212.                    s->last_pic->f->linesize[2]);

  1213.         }

  1214. 

  1215.         if (h->pict_type == AV_PICTURE_TYPE_B && !s->next_pic->f->data[0]) {

  1216.             av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

  1217.             ret = get_buffer(avctx, s->next_pic);

  1218.             if (ret < 0)

  1219.                 return ret;

  1220.             memset(s->next_pic->f->data[0], 0, avctx->height * s->next_pic->f->linesize[0]);

  1221.             memset(s->next_pic->f->data[1], 0x80, (avctx->height / 2) *

  1222.                    s->next_pic->f->linesize[1]);

  1223.             memset(s->next_pic->f->data[2], 0x80, (avctx->height / 2) *

  1224.                    s->next_pic->f->linesize[2]);

  1225.         }

  1226.     }

  1227. 

  1228.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  1229.         av_log(h->avctx, AV_LOG_DEBUG,

  1230.                "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n",

  1231.                av_get_picture_type_char(h->pict_type),

  1232.                s->halfpel_flag, s->thirdpel_flag,

  1233.                s->adaptive_quant, h->slice_ctx[0].qscale, sl->slice_num);

  1234. 

  1235.     if (avctx->skip_frame >= AVDISCARD_NONREF && h->pict_type == AV_PICTURE_TYPE_B ||

  1236.         avctx->skip_frame >= AVDISCARD_NONKEY && h->pict_type != AV_PICTURE_TYPE_I ||

  1237.         avctx->skip_frame >= AVDISCARD_ALL)

  1238.         return 0;

  1239. 

  1240.     if (s->next_p_frame_damaged) {

  1241.         if (h->pict_type == AV_PICTURE_TYPE_B)

  1242.             return 0;

  1243.         else

  1244.             s->next_p_frame_damaged = 0;

  1245.     }

  1246. 

  1247.     if (h->pict_type == AV_PICTURE_TYPE_B) {

  1248.         h->frame_num_offset = sl->slice_num - h->prev_frame_num;

  1249. 

  1250.         if (h->frame_num_offset < 0)

  1251.             h->frame_num_offset += 256;

  1252.         if (h->frame_num_offset == 0 ||

  1253.             h->frame_num_offset >= h->prev_frame_num_offset) {

  1254.             av_log(h->avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  1255.             return -1;

  1256.         }

  1257.     } else {

  1258.         h->prev_frame_num        = h->frame_num;

  1259.         h->frame_num             = sl->slice_num;

  1260.         h->prev_frame_num_offset = h->frame_num - h->prev_frame_num;

  1261. 

  1262.         if (h->prev_frame_num_offset < 0)

  1263.             h->prev_frame_num_offset += 256;

  1264.     }

  1265. 

  1266.     for (m = 0; m < 2; m++) {

  1267.         int i;

  1268.         for (i = 0; i < 4; i++) {

  1269.             int j;

  1270.             for (j = -1; j < 4; j++)

  1271.                 sl->ref_cache[m][scan8[0] + 8 * i + j] = 1;

  1272.             if (i < 3)

  1273.                 sl->ref_cache[m][scan8[0] + 8 * i + j] = PART_NOT_AVAILABLE;

  1274.         }

  1275.     }

  1276. 

  1277.     for (sl->mb_y = 0; sl->mb_y < h->mb_height; sl->mb_y++) {

  1278.         for (sl->mb_x = 0; sl->mb_x < h->mb_width; sl->mb_x++) {

  1279.             unsigned mb_type;

  1280.             sl->mb_xy = sl->mb_x + sl->mb_y * h->mb_stride;

  1281. 

  1282.             if ((get_bits_left(&h->gb)) <= 7) {

  1283.                 if (((get_bits_count(&h->gb) & 7) == 0 ||

  1284.                     show_bits(&h->gb, get_bits_left(&h->gb) & 7) == 0)) {

  1285. 

  1286.                     if (svq3_decode_slice_header(avctx))

  1287.                         return -1;

  1288.                 }

  1289.                 /* TODO: support s->mb_skip_run */

  1290.             }

  1291. 

  1292.             mb_type = svq3_get_ue_golomb(&h->gb);

  1293. 

  1294.             if (h->pict_type == AV_PICTURE_TYPE_I)

  1295.                 mb_type += 8;

  1296.             else if (h->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4)

  1297.                 mb_type += 4;

  1298.             if (mb_type > 33 || svq3_decode_mb(s, mb_type)) {

  1299.                 av_log(h->avctx, AV_LOG_ERROR,

  1300.                        "error while decoding MB %d %d\n", sl->mb_x, sl->mb_y);

  1301.                 return -1;

  1302.             }

  1303. 

  1304.             if (mb_type != 0)

  1305.                 ff_h264_hl_decode_mb(h, &h->slice_ctx[0]);

  1306. 

  1307.             if (h->pict_type != AV_PICTURE_TYPE_B && !h->low_delay)

  1308.                 h->cur_pic.mb_type[sl->mb_x + sl->mb_y * h->mb_stride] =

  1309.                     (h->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1310.         }

  1311. 

  1312.         ff_draw_horiz_band(avctx, s->cur_pic->f,

  1313.                            s->last_pic->f->data[0] ? s->last_pic->f : NULL,

  1314.                            16 * sl->mb_y, 16, h->picture_structure, 0,

  1315.                            h->low_delay);

  1316.     }

  1317. 

  1318.     if (h->pict_type == AV_PICTURE_TYPE_B || h->low_delay)

  1319.         ret = av_frame_ref(data, s->cur_pic->f);

  1320.     else if (s->last_pic->f->data[0])

  1321.         ret = av_frame_ref(data, s->last_pic->f);

  1322.     if (ret < 0)

  1323.         return ret;

  1324. 

  1325.     /* Do not output the last pic after seeking. */

  1326.     if (s->last_pic->f->data[0] || h->low_delay)

  1327.         *got_frame = 1;

  1328. 

  1329.     if (h->pict_type != AV_PICTURE_TYPE_B) {

  1330.         FFSWAP(H264Picture*, s->cur_pic, s->next_pic);

  1331.     } else {

  1332.         av_frame_unref(s->cur_pic->f);

  1333.     }

  1334. 

  1335.     return buf_size;

  1336. }

  1337. 

  1338. static av_cold int svq3_decode_end(AVCodecContext *avctx)

  1339. {

  1340.     SVQ3Context *s = avctx->priv_data;

  1341.     H264Context *h = &s->h;

  1342. 

  1343.     free_picture(avctx, s->cur_pic);

  1344.     free_picture(avctx, s->next_pic);

  1345.     free_picture(avctx, s->last_pic);

  1346.     av_frame_free(&s->cur_pic->f);

  1347.     av_frame_free(&s->next_pic->f);

  1348.     av_frame_free(&s->last_pic->f);

  1349.     av_freep(&s->cur_pic);

  1350.     av_freep(&s->next_pic);

  1351.     av_freep(&s->last_pic);

  1352.     av_freep(&s->slice_buf);

  1353. 

  1354.     memset(&h->cur_pic, 0, sizeof(h->cur_pic));

  1355. 

  1356.     ff_h264_free_context(h);

  1357. 

  1358.     return 0;

  1359. }

  1360. 

  1361. AVCodec ff_svq3_decoder = {

  1362.     .name           = "svq3",

  1363.     .long_name      = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1364.     .type           = AVMEDIA_TYPE_VIDEO,

  1365.     .id             = AV_CODEC_ID_SVQ3,

  1366.     .priv_data_size = sizeof(SVQ3Context),

  1367.     .init           = svq3_decode_init,

  1368.     .close          = svq3_decode_end,

  1369.     .decode         = svq3_decode_frame,

  1370.     .capabilities   = AV_CODEC_CAP_DRAW_HORIZ_BAND |

  1371.                       AV_CODEC_CAP_DR1             |

  1372.                       AV_CODEC_CAP_DELAY,

  1373.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P,

  1374.                                                      AV_PIX_FMT_NONE},

  1375. };