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FFmpeg/libavcodec/ffv1.c

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  1. /*

  2.  * FFV1 codec for libavcodec

  3.  *

  4.  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

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

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

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

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

  12.  *

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

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

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

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

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * FF Video Codec 1 (a lossless codec)

  26.  */

  27. 

  28. #include "avcodec.h"

  29. #include "get_bits.h"

  30. #include "put_bits.h"

  31. #include "dsputil.h"

  32. #include "rangecoder.h"

  33. #include "golomb.h"

  34. #include "mathops.h"

  35. #include "libavutil/avassert.h"

  36. 

  37. #define MAX_PLANES 4

  38. #define CONTEXT_SIZE 32

  39. 

  40. #define MAX_QUANT_TABLES 8

  41. #define MAX_CONTEXT_INPUTS 5

  42. 

  43. extern const uint8_t ff_log2_run[32];

  44. 

  45. static const int8_t quant3[256]={

  46.  0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  47.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  48.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  49.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  50.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  51.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  52.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  53.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  54. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  55. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  56. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  57. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  58. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  59. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  60. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  61. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0,

  62. };

  63. 

  64. static const int8_t quant5_10bit[256]={

  65.  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,

  66.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  67.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  68.  1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  69.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  70.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  71.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  72.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  73. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  74. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  75. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  76. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  77. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,

  78. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  79. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  80. -1,-1,-1,-1,-1,-1,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,

  81. };

  82. 

  83. static const int8_t quant5[256]={

  84.  0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  85.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  86.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  87.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  88.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  89.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  90.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  91.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  92. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  93. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  94. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  95. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  96. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  97. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  98. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  99. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,-1,

  100. };

  101. static const int8_t quant7[256]={

  102.  0, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  103.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  104.  2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,

  105.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  106.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  107.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  108.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  109.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  110. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  111. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  112. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  113. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  114. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  115. -3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,

  116. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  117. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,

  118. };

  119. static const int8_t quant9[256]={

  120.  0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  121.  3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  122.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  123.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  124.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  125.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  126.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  127.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  128. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  129. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  130. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  131. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  132. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  133. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  134. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,

  135. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-1,-1,

  136. };

  137. static const int8_t quant9_10bit[256]={

  138.  0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2,

  139.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3,

  140.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  141.  3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  142.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  143.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  144.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  145.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  146. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  147. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  148. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  149. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  150. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,

  151. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  152. -3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  153. -2,-2,-2,-2,-1,-1,-1,-1,-1,-1,-1,-1,-0,-0,-0,-0,

  154. };

  155. 

  156. static const int8_t quant11[256]={

  157.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

  158.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  159.  4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  160.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  161.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  162.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  163.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  164.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  165. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  166. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  167. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  168. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  169. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  170. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-4,-4,

  171. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  172. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  173. };

  174. static const int8_t quant13[256]={

  175.  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  176.  4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  177.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  178.  5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  179.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  180.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  181.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  182.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  183. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  184. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  185. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  186. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  187. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-5,

  188. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  189. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  190. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,

  191. };

  192. 

  193. static const uint8_t ver2_state[256]= {

  194.    0,  10,  10,  10,  10,  16,  16,  16,  28,  16,  16,  29,  42,  49,  20,  49,

  195.   59,  25,  26,  26,  27,  31,  33,  33,  33,  34,  34,  37,  67,  38,  39,  39,

  196.   40,  40,  41,  79,  43,  44,  45,  45,  48,  48,  64,  50,  51,  52,  88,  52,

  197.   53,  74,  55,  57,  58,  58,  74,  60, 101,  61,  62,  84,  66,  66,  68,  69,

  198.   87,  82,  71,  97,  73,  73,  82,  75, 111,  77,  94,  78,  87,  81,  83,  97,

  199.   85,  83,  94,  86,  99,  89,  90,  99, 111,  92,  93, 134,  95,  98, 105,  98,

  200.  105, 110, 102, 108, 102, 118, 103, 106, 106, 113, 109, 112, 114, 112, 116, 125,

  201.  115, 116, 117, 117, 126, 119, 125, 121, 121, 123, 145, 124, 126, 131, 127, 129,

  202.  165, 130, 132, 138, 133, 135, 145, 136, 137, 139, 146, 141, 143, 142, 144, 148,

  203.  147, 155, 151, 149, 151, 150, 152, 157, 153, 154, 156, 168, 158, 162, 161, 160,

  204.  172, 163, 169, 164, 166, 184, 167, 170, 177, 174, 171, 173, 182, 176, 180, 178,

  205.  175, 189, 179, 181, 186, 183, 192, 185, 200, 187, 191, 188, 190, 197, 193, 196,

  206.  197, 194, 195, 196, 198, 202, 199, 201, 210, 203, 207, 204, 205, 206, 208, 214,

  207.  209, 211, 221, 212, 213, 215, 224, 216, 217, 218, 219, 220, 222, 228, 223, 225,

  208.  226, 224, 227, 229, 240, 230, 231, 232, 233, 234, 235, 236, 238, 239, 237, 242,

  209.  241, 243, 242, 244, 245, 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 255,

  210. };

  211. 

  212. typedef struct VlcState{

  213.     int16_t drift;

  214.     uint16_t error_sum;

  215.     int8_t bias;

  216.     uint8_t count;

  217. } VlcState;

  218. 

  219. typedef struct PlaneContext{

  220.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

  221.     int quant_table_index;

  222.     int context_count;

  223.     uint8_t (*state)[CONTEXT_SIZE];

  224.     VlcState *vlc_state;

  225.     uint8_t interlace_bit_state[2];

  226. } PlaneContext;

  227. 

  228. #define MAX_SLICES 256

  229. 

  230. typedef struct FFV1Context{

  231.     AVCodecContext *avctx;

  232.     RangeCoder c;

  233.     GetBitContext gb;

  234.     PutBitContext pb;

  235.     uint64_t rc_stat[256][2];

  236.     uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];

  237.     int version;

  238.     int width, height;

  239.     int chroma_h_shift, chroma_v_shift;

  240.     int flags;

  241.     int picture_number;

  242.     AVFrame picture;

  243.     int plane_count;

  244.     int ac;                              ///< 1=range coder <-> 0=golomb rice

  245.     PlaneContext plane[MAX_PLANES];

  246.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

  247.     int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256];

  248.     int context_count[MAX_QUANT_TABLES];

  249.     uint8_t state_transition[256];

  250.     uint8_t (*initial_states[MAX_QUANT_TABLES])[32];

  251.     int run_index;

  252.     int colorspace;

  253.     int_fast16_t *sample_buffer;

  254. 

  255.     int quant_table_count;

  256. 

  257.     DSPContext dsp;

  258. 

  259.     struct FFV1Context *slice_context[MAX_SLICES];

  260.     int slice_count;

  261.     int num_v_slices;

  262.     int num_h_slices;

  263.     int slice_width;

  264.     int slice_height;

  265.     int slice_x;

  266.     int slice_y;

  267. }FFV1Context;

  268. 

  269. static av_always_inline int fold(int diff, int bits){

  270.     if(bits==8)

  271.         diff= (int8_t)diff;

  272.     else{

  273.         diff+= 1<<(bits-1);

  274.         diff&=(1<<bits)-1;

  275.         diff-= 1<<(bits-1);

  276.     }

  277. 

  278.     return diff;

  279. }

  280. 

  281. static inline int predict(int_fast16_t *src, int_fast16_t *last){

  282.     const int LT= last[-1];

  283.     const int  T= last[ 0];

  284.     const int L =  src[-1];

  285. 

  286.     return mid_pred(L, L + T - LT, T);

  287. }

  288. 

  289. static inline int get_context(PlaneContext *p, int_fast16_t *src, int_fast16_t *last, int_fast16_t *last2){

  290.     const int LT= last[-1];

  291.     const int  T= last[ 0];

  292.     const int RT= last[ 1];

  293.     const int L =  src[-1];

  294. 

  295.     if(p->quant_table[3][127]){

  296.         const int TT= last2[0];

  297.         const int LL=  src[-2];

  298.         return p->quant_table[0][(L-LT) & 0xFF] + p->quant_table[1][(LT-T) & 0xFF] + p->quant_table[2][(T-RT) & 0xFF]

  299.               +p->quant_table[3][(LL-L) & 0xFF] + p->quant_table[4][(TT-T) & 0xFF];

  300.     }else

  301.         return p->quant_table[0][(L-LT) & 0xFF] + p->quant_table[1][(LT-T) & 0xFF] + p->quant_table[2][(T-RT) & 0xFF];

  302. }

  303. 

  304. static av_always_inline av_flatten void put_symbol_inline(RangeCoder *c, uint8_t *state, int v, int is_signed, uint64_t rc_stat[256][2], uint64_t rc_stat2[32][2]){

  305.     int i;

  306. 

  307. #define put_rac(C,S,B) \

  308. do{\

  309.     if(rc_stat){\

  310.     rc_stat[*(S)][B]++;\

  311.         rc_stat2[(S)-state][B]++;\

  312.     }\

  313.     put_rac(C,S,B);\

  314. }while(0)

  315. 

  316.     if(v){

  317.         const int a= FFABS(v);

  318.         const int e= av_log2(a);

  319.         put_rac(c, state+0, 0);

  320.         if(e<=9){

  321.             for(i=0; i<e; i++){

  322.                 put_rac(c, state+1+i, 1);  //1..10

  323.             }

  324.             put_rac(c, state+1+i, 0);

  325. 

  326.             for(i=e-1; i>=0; i--){

  327.                 put_rac(c, state+22+i, (a>>i)&1); //22..31

  328.             }

  329. 

  330.             if(is_signed)

  331.                 put_rac(c, state+11 + e, v < 0); //11..21

  332.         }else{

  333.             for(i=0; i<e; i++){

  334.                 put_rac(c, state+1+FFMIN(i,9), 1);  //1..10

  335.             }

  336.             put_rac(c, state+1+9, 0);

  337. 

  338.             for(i=e-1; i>=0; i--){

  339.                 put_rac(c, state+22+FFMIN(i,9), (a>>i)&1); //22..31

  340.             }

  341. 

  342.             if(is_signed)

  343.                 put_rac(c, state+11 + 10, v < 0); //11..21

  344.         }

  345.     }else{

  346.         put_rac(c, state+0, 1);

  347.     }

  348. #undef put_rac

  349. }

  350. 

  351. static void av_noinline put_symbol(RangeCoder *c, uint8_t *state, int v, int is_signed){

  352.     put_symbol_inline(c, state, v, is_signed, NULL, NULL);

  353. }

  354. 

  355. static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state, int is_signed){

  356.     if(get_rac(c, state+0))

  357.         return 0;

  358.     else{

  359.         int i, e, a;

  360.         e= 0;

  361.         while(get_rac(c, state+1 + FFMIN(e,9))){ //1..10

  362.             e++;

  363.         }

  364. 

  365.         a= 1;

  366.         for(i=e-1; i>=0; i--){

  367.             a += a + get_rac(c, state+22 + FFMIN(i,9)); //22..31

  368.         }

  369. 

  370.         e= -(is_signed && get_rac(c, state+11 + FFMIN(e, 10))); //11..21

  371.         return (a^e)-e;

  372.     }

  373. }

  374. 

  375. static int av_noinline get_symbol(RangeCoder *c, uint8_t *state, int is_signed){

  376.     return get_symbol_inline(c, state, is_signed);

  377. }

  378. 

  379. static inline void update_vlc_state(VlcState * const state, const int v){

  380.     int drift= state->drift;

  381.     int count= state->count;

  382.     state->error_sum += FFABS(v);

  383.     drift += v;

  384. 

  385.     if(count == 128){ //FIXME variable

  386.         count >>= 1;

  387.         drift >>= 1;

  388.         state->error_sum >>= 1;

  389.     }

  390.     count++;

  391. 

  392.     if(drift <= -count){

  393.         if(state->bias > -128) state->bias--;

  394. 

  395.         drift += count;

  396.         if(drift <= -count)

  397.             drift= -count + 1;

  398.     }else if(drift > 0){

  399.         if(state->bias <  127) state->bias++;

  400. 

  401.         drift -= count;

  402.         if(drift > 0)

  403.             drift= 0;

  404.     }

  405. 

  406.     state->drift= drift;

  407.     state->count= count;

  408. }

  409. 

  410. static inline void put_vlc_symbol(PutBitContext *pb, VlcState * const state, int v, int bits){

  411.     int i, k, code;

  412. //printf("final: %d ", v);

  413.     v = fold(v - state->bias, bits);

  414. 

  415.     i= state->count;

  416.     k=0;

  417.     while(i < state->error_sum){ //FIXME optimize

  418.         k++;

  419.         i += i;

  420.     }

  421. 

  422.     assert(k<=8);

  423. 

  424. #if 0 // JPEG LS

  425.     if(k==0 && 2*state->drift <= - state->count) code= v ^ (-1);

  426.     else                                         code= v;

  427. #else

  428.      code= v ^ ((2*state->drift + state->count)>>31);

  429. #endif

  430. 

  431. //printf("v:%d/%d bias:%d error:%d drift:%d count:%d k:%d\n", v, code, state->bias, state->error_sum, state->drift, state->count, k);

  432.     set_sr_golomb(pb, code, k, 12, bits);

  433. 

  434.     update_vlc_state(state, v);

  435. }

  436. 

  437. static inline int get_vlc_symbol(GetBitContext *gb, VlcState * const state, int bits){

  438.     int k, i, v, ret;

  439. 

  440.     i= state->count;

  441.     k=0;

  442.     while(i < state->error_sum){ //FIXME optimize

  443.         k++;

  444.         i += i;

  445.     }

  446. 

  447.     assert(k<=8);

  448. 

  449.     v= get_sr_golomb(gb, k, 12, bits);

  450. //printf("v:%d bias:%d error:%d drift:%d count:%d k:%d", v, state->bias, state->error_sum, state->drift, state->count, k);

  451. 

  452. #if 0 // JPEG LS

  453.     if(k==0 && 2*state->drift <= - state->count) v ^= (-1);

  454. #else

  455.      v ^= ((2*state->drift + state->count)>>31);

  456. #endif

  457. 

  458.     ret= fold(v + state->bias, bits);

  459. 

  460.     update_vlc_state(state, v);

  461. //printf("final: %d\n", ret);

  462.     return ret;

  463. }

  464. 

  465. #if CONFIG_FFV1_ENCODER

  466. static av_always_inline int encode_line(FFV1Context *s, int w, int_fast16_t *sample[2], int plane_index, int bits){

  467.     PlaneContext * const p= &s->plane[plane_index];

  468.     RangeCoder * const c= &s->c;

  469.     int x;

  470.     int run_index= s->run_index;

  471.     int run_count=0;

  472.     int run_mode=0;

  473. 

  474.     if(s->ac){

  475.         if(c->bytestream_end - c->bytestream < w*20){

  476.             av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");

  477.             return -1;

  478.         }

  479.     }else{

  480.         if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < w*4){

  481.             av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");

  482.             return -1;

  483.         }

  484.     }

  485. 

  486.     for(x=0; x<w; x++){

  487.         int diff, context;

  488. 

  489.         context= get_context(p, sample[0]+x, sample[1]+x, sample[2]+x);

  490.         diff= sample[0][x] - predict(sample[0]+x, sample[1]+x);

  491. 

  492.         if(context < 0){

  493.             context = -context;

  494.             diff= -diff;

  495.         }

  496. 

  497.         diff= fold(diff, bits);

  498. 

  499.         if(s->ac){

  500.             if(s->flags & CODEC_FLAG_PASS1){

  501.                 put_symbol_inline(c, p->state[context], diff, 1, s->rc_stat, s->rc_stat2[p->quant_table_index][context]);

  502.             }else{

  503.                 put_symbol_inline(c, p->state[context], diff, 1, NULL, NULL);

  504.             }

  505.         }else{

  506.             if(context == 0) run_mode=1;

  507. 

  508.             if(run_mode){

  509. 

  510.                 if(diff){

  511.                     while(run_count >= 1<<ff_log2_run[run_index]){

  512.                         run_count -= 1<<ff_log2_run[run_index];

  513.                         run_index++;

  514.                         put_bits(&s->pb, 1, 1);

  515.                     }

  516. 

  517.                     put_bits(&s->pb, 1 + ff_log2_run[run_index], run_count);

  518.                     if(run_index) run_index--;

  519.                     run_count=0;

  520.                     run_mode=0;

  521.                     if(diff>0) diff--;

  522.                 }else{

  523.                     run_count++;

  524.                 }

  525.             }

  526. 

  527. //            printf("count:%d index:%d, mode:%d, x:%d y:%d pos:%d\n", run_count, run_index, run_mode, x, y, (int)put_bits_count(&s->pb));

  528. 

  529.             if(run_mode == 0)

  530.                 put_vlc_symbol(&s->pb, &p->vlc_state[context], diff, bits);

  531.         }

  532.     }

  533.     if(run_mode){

  534.         while(run_count >= 1<<ff_log2_run[run_index]){

  535.             run_count -= 1<<ff_log2_run[run_index];

  536.             run_index++;

  537.             put_bits(&s->pb, 1, 1);

  538.         }

  539. 

  540.         if(run_count)

  541.             put_bits(&s->pb, 1, 1);

  542.     }

  543.     s->run_index= run_index;

  544. 

  545.     return 0;

  546. }

  547. 

  548. static void encode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){

  549.     int x,y,i;

  550.     const int ring_size= s->avctx->context_model ? 3 : 2;

  551.     int_fast16_t *sample[3];

  552.     s->run_index=0;

  553. 

  554.     memset(s->sample_buffer, 0, ring_size*(w+6)*sizeof(*s->sample_buffer));

  555. 

  556.     for(y=0; y<h; y++){

  557.         for(i=0; i<ring_size; i++)

  558.             sample[i]= s->sample_buffer + (w+6)*((h+i-y)%ring_size) + 3;

  559. 

  560.         sample[0][-1]= sample[1][0  ];

  561.         sample[1][ w]= sample[1][w-1];

  562. //{START_TIMER

  563.         if(s->avctx->bits_per_raw_sample<=8){

  564.             for(x=0; x<w; x++){

  565.                 sample[0][x]= src[x + stride*y];

  566.             }

  567.             encode_line(s, w, sample, plane_index, 8);

  568.         }else{

  569.             for(x=0; x<w; x++){

  570.                 sample[0][x]= ((uint16_t*)(src + stride*y))[x] >> (16 - s->avctx->bits_per_raw_sample);

  571.             }

  572.             encode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

  573.         }

  574. //STOP_TIMER("encode line")}

  575.     }

  576. }

  577. 

  578. static void encode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){

  579.     int x, y, p, i;

  580.     const int ring_size= s->avctx->context_model ? 3 : 2;

  581.     int_fast16_t *sample[3][3];

  582.     s->run_index=0;

  583. 

  584.     memset(s->sample_buffer, 0, ring_size*3*(w+6)*sizeof(*s->sample_buffer));

  585. 

  586.     for(y=0; y<h; y++){

  587.         for(i=0; i<ring_size; i++)

  588.             for(p=0; p<3; p++)

  589.                 sample[p][i]= s->sample_buffer + p*ring_size*(w+6) + ((h+i-y)%ring_size)*(w+6) + 3;

  590. 

  591.         for(x=0; x<w; x++){

  592.             int v= src[x + stride*y];

  593.             int b= v&0xFF;

  594.             int g= (v>>8)&0xFF;

  595.             int r= (v>>16)&0xFF;

  596. 

  597.             b -= g;

  598.             r -= g;

  599.             g += (b + r)>>2;

  600.             b += 0x100;

  601.             r += 0x100;

  602. 

  603. //            assert(g>=0 && b>=0 && r>=0);

  604. //            assert(g<256 && b<512 && r<512);

  605.             sample[0][0][x]= g;

  606.             sample[1][0][x]= b;

  607.             sample[2][0][x]= r;

  608.         }

  609.         for(p=0; p<3; p++){

  610.             sample[p][0][-1]= sample[p][1][0  ];

  611.             sample[p][1][ w]= sample[p][1][w-1];

  612.             encode_line(s, w, sample[p], FFMIN(p, 1), 9);

  613.         }

  614.     }

  615. }

  616. 

  617. static void write_quant_table(RangeCoder *c, int16_t *quant_table){

  618.     int last=0;

  619.     int i;

  620.     uint8_t state[CONTEXT_SIZE];

  621.     memset(state, 128, sizeof(state));

  622. 

  623.     for(i=1; i<128 ; i++){

  624.         if(quant_table[i] != quant_table[i-1]){

  625.             put_symbol(c, state, i-last-1, 0);

  626.             last= i;

  627.         }

  628.     }

  629.     put_symbol(c, state, i-last-1, 0);

  630. }

  631. 

  632. static void write_quant_tables(RangeCoder *c, int16_t quant_table[MAX_CONTEXT_INPUTS][256]){

  633.     int i;

  634.     for(i=0; i<5; i++)

  635.         write_quant_table(c, quant_table[i]);

  636. }

  637. 

  638. static void write_header(FFV1Context *f){

  639.     uint8_t state[CONTEXT_SIZE];

  640.     int i, j;

  641.     RangeCoder * const c= &f->slice_context[0]->c;

  642. 

  643.     memset(state, 128, sizeof(state));

  644. 

  645.     if(f->version < 2){

  646.         put_symbol(c, state, f->version, 0);

  647.         put_symbol(c, state, f->ac, 0);

  648.         if(f->ac>1){

  649.             for(i=1; i<256; i++){

  650.                 put_symbol(c, state, f->state_transition[i] - c->one_state[i], 1);

  651.             }

  652.         }

  653.         put_symbol(c, state, f->colorspace, 0); //YUV cs type

  654.         if(f->version>0)

  655.             put_symbol(c, state, f->avctx->bits_per_raw_sample, 0);

  656.         put_rac(c, state, 1); //chroma planes

  657.             put_symbol(c, state, f->chroma_h_shift, 0);

  658.             put_symbol(c, state, f->chroma_v_shift, 0);

  659.         put_rac(c, state, 0); //no transparency plane

  660. 

  661.         write_quant_tables(c, f->quant_table);

  662.     }else{

  663.         put_symbol(c, state, f->slice_count, 0);

  664.         for(i=0; i<f->slice_count; i++){

  665.             FFV1Context *fs= f->slice_context[i];

  666.             put_symbol(c, state, (fs->slice_x     +1)*f->num_h_slices / f->width   , 0);

  667.             put_symbol(c, state, (fs->slice_y     +1)*f->num_v_slices / f->height  , 0);

  668.             put_symbol(c, state, (fs->slice_width +1)*f->num_h_slices / f->width -1, 0);

  669.             put_symbol(c, state, (fs->slice_height+1)*f->num_v_slices / f->height-1, 0);

  670.             for(j=0; j<f->plane_count; j++){

  671.                 put_symbol(c, state, f->plane[j].quant_table_index, 0);

  672.                 av_assert0(f->plane[j].quant_table_index == f->avctx->context_model);

  673.             }

  674.         }

  675.     }

  676. }

  677. #endif /* CONFIG_FFV1_ENCODER */

  678. 

  679. static av_cold int common_init(AVCodecContext *avctx){

  680.     FFV1Context *s = avctx->priv_data;

  681. 

  682.     s->avctx= avctx;

  683.     s->flags= avctx->flags;

  684. 

  685.     dsputil_init(&s->dsp, avctx);

  686. 

  687.     s->width = avctx->width;

  688.     s->height= avctx->height;

  689. 

  690.     assert(s->width && s->height);

  691.     //defaults

  692.     s->num_h_slices=1;

  693.     s->num_v_slices=1;

  694. 

  695. 

  696.     return 0;

  697. }

  698. 

  699. static int init_slice_state(FFV1Context *f){

  700.     int i, j;

  701. 

  702.     for(i=0; i<f->slice_count; i++){

  703.         FFV1Context *fs= f->slice_context[i];

  704.         for(j=0; j<f->plane_count; j++){

  705.             PlaneContext * const p= &fs->plane[j];

  706. 

  707.             if(fs->ac){

  708.                 if(!p->    state) p->    state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));

  709.                 if(!p->    state)

  710.                     return AVERROR(ENOMEM);

  711.             }else{

  712.                 if(!p->vlc_state) p->vlc_state= av_malloc(p->context_count*sizeof(VlcState));

  713.                 if(!p->vlc_state)

  714.                     return AVERROR(ENOMEM);

  715.             }

  716.         }

  717. 

  718.         if (fs->ac>1){

  719.             //FIXME only redo if state_transition changed

  720.             for(j=1; j<256; j++){

  721.                 fs->c.one_state [    j]= fs->state_transition[j];

  722.                 fs->c.zero_state[256-j]= 256-fs->c.one_state [j];

  723.             }

  724.         }

  725.     }

  726. 

  727.     return 0;

  728. }

  729. 

  730. static av_cold int init_slice_contexts(FFV1Context *f){

  731.     int i;

  732. 

  733.     f->slice_count= f->num_h_slices * f->num_v_slices;

  734. 

  735.     for(i=0; i<f->slice_count; i++){

  736.         FFV1Context *fs= av_mallocz(sizeof(*fs));

  737.         int sx= i % f->num_h_slices;

  738.         int sy= i / f->num_h_slices;

  739.         int sxs= f->avctx->width * sx    / f->num_h_slices;

  740.         int sxe= f->avctx->width *(sx+1) / f->num_h_slices;

  741.         int sys= f->avctx->height* sy    / f->num_v_slices;

  742.         int sye= f->avctx->height*(sy+1) / f->num_v_slices;

  743.         f->slice_context[i]= fs;

  744.         memcpy(fs, f, sizeof(*fs));

  745.         memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));

  746. 

  747.         fs->slice_width = sxe - sxs;

  748.         fs->slice_height= sye - sys;

  749.         fs->slice_x     = sxs;

  750.         fs->slice_y     = sys;

  751. 

  752.         fs->sample_buffer = av_malloc(6 * (fs->width+6) * sizeof(*fs->sample_buffer));

  753.         if (!fs->sample_buffer)

  754.             return AVERROR(ENOMEM);

  755.     }

  756.     return 0;

  757. }

  758. 

  759. static int allocate_initial_states(FFV1Context *f){

  760.     int i;

  761. 

  762.     for(i=0; i<f->quant_table_count; i++){

  763.         f->initial_states[i]= av_malloc(f->context_count[i]*sizeof(*f->initial_states[i]));

  764.         if(!f->initial_states[i])

  765.             return AVERROR(ENOMEM);

  766.         memset(f->initial_states[i], 128, f->context_count[i]*sizeof(*f->initial_states[i]));

  767.     }

  768.     return 0;

  769. }

  770. 

  771. #if CONFIG_FFV1_ENCODER

  772. static int write_extra_header(FFV1Context *f){

  773.     RangeCoder * const c= &f->c;

  774.     uint8_t state[CONTEXT_SIZE];

  775.     int i, j, k;

  776.     uint8_t state2[32][CONTEXT_SIZE];

  777. 

  778.     memset(state2, 128, sizeof(state2));

  779.     memset(state, 128, sizeof(state));

  780. 

  781.     f->avctx->extradata= av_malloc(f->avctx->extradata_size= 10000 + (11*11*5*5*5+11*11*11)*32);

  782.     ff_init_range_encoder(c, f->avctx->extradata, f->avctx->extradata_size);

  783.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  784. 

  785.     put_symbol(c, state, f->version, 0);

  786.     put_symbol(c, state, f->ac, 0);

  787.     if(f->ac>1){

  788.         for(i=1; i<256; i++){

  789.             put_symbol(c, state, f->state_transition[i] - c->one_state[i], 1);

  790.         }

  791.     }

  792.     put_symbol(c, state, f->colorspace, 0); //YUV cs type

  793.     put_symbol(c, state, f->avctx->bits_per_raw_sample, 0);

  794.     put_rac(c, state, 1); //chroma planes

  795.         put_symbol(c, state, f->chroma_h_shift, 0);

  796.         put_symbol(c, state, f->chroma_v_shift, 0);

  797.     put_rac(c, state, 0); //no transparency plane

  798.     put_symbol(c, state, f->num_h_slices-1, 0);

  799.     put_symbol(c, state, f->num_v_slices-1, 0);

  800. 

  801.     put_symbol(c, state, f->quant_table_count, 0);

  802.     for(i=0; i<f->quant_table_count; i++)

  803.         write_quant_tables(c, f->quant_tables[i]);

  804. 

  805.     for(i=0; i<f->quant_table_count; i++){

  806.         for(j=0; j<f->context_count[i]*CONTEXT_SIZE; j++)

  807.             if(f->initial_states[i] && f->initial_states[i][0][j] != 128)

  808.                 break;

  809.         if(j<f->context_count[i]*CONTEXT_SIZE){

  810.             put_rac(c, state, 1);

  811.             for(j=0; j<f->context_count[i]; j++){

  812.                 for(k=0; k<CONTEXT_SIZE; k++){

  813.                     int pred= j ? f->initial_states[i][j-1][k] : 128;

  814.                     put_symbol(c, state2[k], (int8_t)(f->initial_states[i][j][k]-pred), 1);

  815.                 }

  816.             }

  817.         }else{

  818.             put_rac(c, state, 0);

  819.         }

  820.     }

  821. 

  822.     f->avctx->extradata_size= ff_rac_terminate(c);

  823. 

  824.     return 0;

  825. }

  826. 

  827. static int sort_stt(FFV1Context *s, uint8_t stt[256]){

  828.     int i,i2,changed,print=0;

  829. 

  830.     do{

  831.         changed=0;

  832.         for(i=12; i<244; i++){

  833.             for(i2=i+1; i2<245 && i2<i+4; i2++){

  834. #define COST(old, new) \

  835.     s->rc_stat[old][0]*-log2((256-(new))/256.0)\

  836.    +s->rc_stat[old][1]*-log2(     (new) /256.0)

  837. 

  838. #define COST2(old, new) \

  839.     COST(old, new)\

  840.    +COST(256-(old), 256-(new))

  841. 

  842.                 double size0= COST2(i, i ) + COST2(i2, i2);

  843.                 double sizeX= COST2(i, i2) + COST2(i2, i );

  844.                 if(sizeX < size0 && i!=128 && i2!=128){

  845.                     int j;

  846.                     FFSWAP(int, stt[    i], stt[    i2]);

  847.                     FFSWAP(int, s->rc_stat[i    ][0],s->rc_stat[    i2][0]);

  848.                     FFSWAP(int, s->rc_stat[i    ][1],s->rc_stat[    i2][1]);

  849.                     if(i != 256-i2){

  850.                         FFSWAP(int, stt[256-i], stt[256-i2]);

  851.                         FFSWAP(int, s->rc_stat[256-i][0],s->rc_stat[256-i2][0]);

  852.                         FFSWAP(int, s->rc_stat[256-i][1],s->rc_stat[256-i2][1]);

  853.                     }

  854.                     for(j=1; j<256; j++){

  855.                         if     (stt[j] == i ) stt[j] = i2;

  856.                         else if(stt[j] == i2) stt[j] = i ;

  857.                         if(i != 256-i2){

  858.                             if     (stt[256-j] == 256-i ) stt[256-j] = 256-i2;

  859.                             else if(stt[256-j] == 256-i2) stt[256-j] = 256-i ;

  860.                         }

  861.                     }

  862.                     print=changed=1;

  863.                 }

  864.             }

  865.         }

  866.     }while(changed);

  867.     return print;

  868. }

  869. 

  870. static av_cold int encode_init(AVCodecContext *avctx)

  871. {

  872.     FFV1Context *s = avctx->priv_data;

  873.     int i, j, k, m;

  874. 

  875.     common_init(avctx);

  876. 

  877.     s->version=0;

  878.     s->ac= avctx->coder_type ? 2:0;

  879. 

  880.     if(s->ac>1)

  881.         for(i=1; i<256; i++)

  882.             s->state_transition[i]=ver2_state[i];

  883. 

  884.     s->plane_count=2;

  885.     for(i=0; i<256; i++){

  886.         s->quant_table_count=2;

  887.         if(avctx->bits_per_raw_sample <=8){

  888.             s->quant_tables[0][0][i]=           quant11[i];

  889.             s->quant_tables[0][1][i]=        11*quant11[i];

  890.             s->quant_tables[0][2][i]=     11*11*quant11[i];

  891.             s->quant_tables[1][0][i]=           quant11[i];

  892.             s->quant_tables[1][1][i]=        11*quant11[i];

  893.             s->quant_tables[1][2][i]=     11*11*quant5 [i];

  894.             s->quant_tables[1][3][i]=   5*11*11*quant5 [i];

  895.             s->quant_tables[1][4][i]= 5*5*11*11*quant5 [i];

  896.         }else{

  897.             s->quant_tables[0][0][i]=           quant9_10bit[i];

  898.             s->quant_tables[0][1][i]=        11*quant9_10bit[i];

  899.             s->quant_tables[0][2][i]=     11*11*quant9_10bit[i];

  900.             s->quant_tables[1][0][i]=           quant9_10bit[i];

  901.             s->quant_tables[1][1][i]=        11*quant9_10bit[i];

  902.             s->quant_tables[1][2][i]=     11*11*quant5_10bit[i];

  903.             s->quant_tables[1][3][i]=   5*11*11*quant5_10bit[i];

  904.             s->quant_tables[1][4][i]= 5*5*11*11*quant5_10bit[i];

  905.         }

  906.     }

  907.     s->context_count[0]= (11*11*11+1)/2;

  908.     s->context_count[1]= (11*11*5*5*5+1)/2;

  909.     memcpy(s->quant_table, s->quant_tables[avctx->context_model], sizeof(s->quant_table));

  910. 

  911.     for(i=0; i<s->plane_count; i++){

  912.         PlaneContext * const p= &s->plane[i];

  913. 

  914.         memcpy(p->quant_table, s->quant_table, sizeof(p->quant_table));

  915.         p->quant_table_index= avctx->context_model;

  916.         p->context_count= s->context_count[p->quant_table_index];

  917.     }

  918. 

  919.     if(allocate_initial_states(s) < 0)

  920.         return AVERROR(ENOMEM);

  921. 

  922.     avctx->coded_frame= &s->picture;

  923.     switch(avctx->pix_fmt){

  924.     case PIX_FMT_YUV444P16:

  925.     case PIX_FMT_YUV422P16:

  926.     case PIX_FMT_YUV420P16:

  927.         if(avctx->bits_per_raw_sample <=8){

  928.             av_log(avctx, AV_LOG_ERROR, "bits_per_raw_sample invalid\n");

  929.             return -1;

  930.         }

  931.         if(!s->ac){

  932.             av_log(avctx, AV_LOG_ERROR, "bits_per_raw_sample of more than 8 needs -coder 1 currently\n");

  933.             return -1;

  934.         }

  935.         s->version= FFMAX(s->version, 1);

  936.     case PIX_FMT_YUV444P:

  937.     case PIX_FMT_YUV422P:

  938.     case PIX_FMT_YUV420P:

  939.     case PIX_FMT_YUV411P:

  940.     case PIX_FMT_YUV410P:

  941.         s->colorspace= 0;

  942.         break;

  943.     case PIX_FMT_RGB32:

  944.         s->colorspace= 1;

  945.         break;

  946.     default:

  947.         av_log(avctx, AV_LOG_ERROR, "format not supported\n");

  948.         return -1;

  949.     }

  950.     avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift, &s->chroma_v_shift);

  951. 

  952.     s->picture_number=0;

  953. 

  954.     if(avctx->flags & (CODEC_FLAG_PASS1|CODEC_FLAG_PASS2)){

  955.         for(i=0; i<s->quant_table_count; i++){

  956.             s->rc_stat2[i]= av_mallocz(s->context_count[i]*sizeof(*s->rc_stat2[i]));

  957.             if(!s->rc_stat2[i])

  958.                 return AVERROR(ENOMEM);

  959.         }

  960.     }

  961.     if(avctx->stats_in){

  962.         char *p= avctx->stats_in;

  963. 

  964.         av_assert0(s->version>=2);

  965. 

  966.         for(;;){

  967.             for(j=0; j<256; j++){

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

  969.                     char *next;

  970.                     s->rc_stat[j][i]= strtol(p, &next, 0);

  971.                     if(next==p){

  972.                         av_log(avctx, AV_LOG_ERROR, "2Pass file invalid at %d %d [%s]\n", j,i,p);

  973.                         return -1;

  974.                     }

  975.                     p=next;

  976.                 }

  977.             }

  978.             for(i=0; i<s->quant_table_count; i++){

  979.                 for(j=0; j<s->context_count[i]; j++){

  980.                     for(k=0; k<32; k++){

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

  982.                             char *next;

  983.                             s->rc_stat2[i][j][k][m]= strtol(p, &next, 0);

  984.                             if(next==p){

  985.                                 av_log(avctx, AV_LOG_ERROR, "2Pass file invalid at %d %d %d %d [%s]\n", i,j,k,m,p);

  986.                                 return -1;

  987.                             }

  988.                             p=next;

  989.                         }

  990.                     }

  991.                 }

  992.             }

  993.             while(*p=='\n' || *p==' ') p++;

  994.             if(p[0]==0) break;

  995.         }

  996.         sort_stt(s, s->state_transition);

  997. 

  998.         for(i=0; i<s->quant_table_count; i++){

  999.             for(j=0; j<s->context_count[i]; j++){

  1000.                 for(k=0; k<32; k++){

  1001.                     int p= 128;

  1002.                     if(s->rc_stat2[i][j][k][0]+s->rc_stat2[i][j][k][1]){

  1003.                         p=256*s->rc_stat2[i][j][k][1] / (s->rc_stat2[i][j][k][0]+s->rc_stat2[i][j][k][1]);

  1004.                     }

  1005.                     p= av_clip(p, 1, 254);

  1006.                     s->initial_states[i][j][k]= p;

  1007.                 }

  1008.             }

  1009.         }

  1010.     }

  1011. 

  1012.     if(s->version>1){

  1013.         s->num_h_slices=2;

  1014.         s->num_v_slices=2;

  1015.         write_extra_header(s);

  1016.     }

  1017. 

  1018.     if(init_slice_contexts(s) < 0)

  1019.         return -1;

  1020.     if(init_slice_state(s) < 0)

  1021.         return -1;

  1022. 

  1023. #define STATS_OUT_SIZE 1024*1024*6

  1024.     if(avctx->flags & CODEC_FLAG_PASS1){

  1025.     avctx->stats_out= av_mallocz(STATS_OUT_SIZE);

  1026.         for(i=0; i<s->quant_table_count; i++){

  1027.             for(j=0; j<s->slice_count; j++){

  1028.                 FFV1Context *sf= s->slice_context[j];

  1029.                 av_assert0(!sf->rc_stat2[i]);

  1030.                 sf->rc_stat2[i]= av_mallocz(s->context_count[i]*sizeof(*sf->rc_stat2[i]));

  1031.                 if(!sf->rc_stat2[i])

  1032.                     return AVERROR(ENOMEM);

  1033.             }

  1034.         }

  1035.     }

  1036. 

  1037.     return 0;

  1038. }

  1039. #endif /* CONFIG_FFV1_ENCODER */

  1040. 

  1041. 

  1042. static void clear_state(FFV1Context *f){

  1043.     int i, si, j;

  1044. 

  1045.     for(si=0; si<f->slice_count; si++){

  1046.         FFV1Context *fs= f->slice_context[si];

  1047.         for(i=0; i<f->plane_count; i++){

  1048.             PlaneContext *p= &fs->plane[i];

  1049. 

  1050.             p->interlace_bit_state[0]= 128;

  1051.             p->interlace_bit_state[1]= 128;

  1052. 

  1053.             if(fs->ac){

  1054.                 if(f->initial_states[p->quant_table_index]){

  1055.                     memcpy(p->state, f->initial_states[p->quant_table_index], CONTEXT_SIZE*p->context_count);

  1056.                 }else

  1057.                 memset(p->state, 128, CONTEXT_SIZE*p->context_count);

  1058.             }else{

  1059.             for(j=0; j<p->context_count; j++){

  1060.                     p->vlc_state[j].drift= 0;

  1061.                     p->vlc_state[j].error_sum= 4; //FFMAX((RANGE + 32)/64, 2);

  1062.                     p->vlc_state[j].bias= 0;

  1063.                     p->vlc_state[j].count= 1;

  1064.             }

  1065.             }

  1066.         }

  1067.     }

  1068. }

  1069. 

  1070. #if CONFIG_FFV1_ENCODER

  1071. static int encode_slice(AVCodecContext *c, void *arg){

  1072.     FFV1Context *fs= *(void**)arg;

  1073.     FFV1Context *f= fs->avctx->priv_data;

  1074.     int width = fs->slice_width;

  1075.     int height= fs->slice_height;

  1076.     int x= fs->slice_x;

  1077.     int y= fs->slice_y;

  1078.     AVFrame * const p= &f->picture;

  1079. 

  1080.     if(f->colorspace==0){

  1081.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1082.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1083.         const int cx= x>>f->chroma_h_shift;

  1084.         const int cy= y>>f->chroma_v_shift;

  1085. 

  1086.         encode_plane(fs, p->data[0] + x + y*p->linesize[0], width, height, p->linesize[0], 0);

  1087. 

  1088.         encode_plane(fs, p->data[1] + cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  1089.         encode_plane(fs, p->data[2] + cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);

  1090.     }else{

  1091.         encode_rgb_frame(fs, (uint32_t*)(p->data[0]) + x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1092.     }

  1093.     emms_c();

  1094. 

  1095.     return 0;

  1096. }

  1097. 

  1098. static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

  1099.     FFV1Context *f = avctx->priv_data;

  1100.     RangeCoder * const c= &f->slice_context[0]->c;

  1101.     AVFrame *pict = data;

  1102.     AVFrame * const p= &f->picture;

  1103.     int used_count= 0;

  1104.     uint8_t keystate=128;

  1105.     uint8_t *buf_p;

  1106.     int i;

  1107. 

  1108.     ff_init_range_encoder(c, buf, buf_size);

  1109.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1110. 

  1111.     *p = *pict;

  1112.     p->pict_type= FF_I_TYPE;

  1113. 

  1114.     if(avctx->gop_size==0 || f->picture_number % avctx->gop_size == 0){

  1115.         put_rac(c, &keystate, 1);

  1116.         p->key_frame= 1;

  1117.         write_header(f);

  1118.         clear_state(f);

  1119.     }else{

  1120.         put_rac(c, &keystate, 0);

  1121.         p->key_frame= 0;

  1122.     }

  1123. 

  1124.     if(!f->ac){

  1125.         used_count += ff_rac_terminate(c);

  1126. //printf("pos=%d\n", used_count);

  1127.         init_put_bits(&f->slice_context[0]->pb, buf + used_count, buf_size - used_count);

  1128.     }else if (f->ac>1){

  1129.         int i;

  1130.         for(i=1; i<256; i++){

  1131.             c->one_state[i]= f->state_transition[i];

  1132.             c->zero_state[256-i]= 256-c->one_state[i];

  1133.         }

  1134.     }

  1135. 

  1136.     for(i=1; i<f->slice_count; i++){

  1137.         FFV1Context *fs= f->slice_context[i];

  1138.         uint8_t *start= buf + (buf_size-used_count)*i/f->slice_count;

  1139.         int len= buf_size/f->slice_count;

  1140. 

  1141.         if(fs->ac){

  1142.             ff_init_range_encoder(&fs->c, start, len);

  1143.         }else{

  1144.             init_put_bits(&fs->pb, start, len);

  1145.         }

  1146.     }

  1147.     avctx->execute(avctx, encode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1148. 

  1149.     buf_p=buf;

  1150.     for(i=0; i<f->slice_count; i++){

  1151.         FFV1Context *fs= f->slice_context[i];

  1152.         int bytes;

  1153. 

  1154.         if(fs->ac){

  1155.             uint8_t state=128;

  1156.             put_rac(&fs->c, &state, 0);

  1157.             bytes= ff_rac_terminate(&fs->c);

  1158.         }else{

  1159.             flush_put_bits(&fs->pb); //nicer padding FIXME

  1160.             bytes= used_count + (put_bits_count(&fs->pb)+7)/8;

  1161.             used_count= 0;

  1162.         }

  1163.         if(i>0){

  1164.             av_assert0(bytes < buf_size/f->slice_count);

  1165.             memmove(buf_p, fs->ac ? fs->c.bytestream_start : fs->pb.buf, bytes);

  1166.             av_assert0(bytes < (1<<24));

  1167.             AV_WB24(buf_p+bytes, bytes);

  1168.             bytes+=3;

  1169.         }

  1170.         buf_p += bytes;

  1171.     }

  1172. 

  1173.     if((avctx->flags&CODEC_FLAG_PASS1) && (f->picture_number&31)==0){

  1174.         int j, k, m;

  1175.         char *p= avctx->stats_out;

  1176.         char *end= p + STATS_OUT_SIZE;

  1177. 

  1178.         memset(f->rc_stat, 0, sizeof(f->rc_stat));

  1179.         for(i=0; i<f->quant_table_count; i++)

  1180.             memset(f->rc_stat2[i], 0, f->context_count[i]*sizeof(*f->rc_stat2[i]));

  1181. 

  1182.         for(j=0; j<f->slice_count; j++){

  1183.             FFV1Context *fs= f->slice_context[j];

  1184.             for(i=0; i<256; i++){

  1185.                 f->rc_stat[i][0] += fs->rc_stat[i][0];

  1186.                 f->rc_stat[i][1] += fs->rc_stat[i][1];

  1187.             }

  1188.             for(i=0; i<f->quant_table_count; i++){

  1189.                 for(k=0; k<f->context_count[i]; k++){

  1190.                     for(m=0; m<32; m++){

  1191.                         f->rc_stat2[i][k][m][0] += fs->rc_stat2[i][k][m][0];

  1192.                         f->rc_stat2[i][k][m][1] += fs->rc_stat2[i][k][m][1];

  1193.                     }

  1194.                 }

  1195.             }

  1196.         }

  1197. 

  1198.         for(j=0; j<256; j++){

  1199.             snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat[j][0], f->rc_stat[j][1]);

  1200.             p+= strlen(p);

  1201.         }

  1202.         snprintf(p, end-p, "\n");

  1203. 

  1204.         for(i=0; i<f->quant_table_count; i++){

  1205.             for(j=0; j<f->context_count[i]; j++){

  1206.                 for(m=0; m<32; m++){

  1207.                     snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat2[i][j][m][0], f->rc_stat2[i][j][m][1]);

  1208.                     p+= strlen(p);

  1209.                 }

  1210.             }

  1211.         }

  1212.         snprintf(p, end-p, "\n");

  1213.     } else if(avctx->flags&CODEC_FLAG_PASS1)

  1214.         avctx->stats_out[0] = '\0';

  1215. 

  1216.     f->picture_number++;

  1217.     return buf_p-buf;

  1218. }

  1219. #endif /* CONFIG_FFV1_ENCODER */

  1220. 

  1221. static av_cold int common_end(AVCodecContext *avctx){

  1222.     FFV1Context *s = avctx->priv_data;

  1223.     int i, j;

  1224. 

  1225.     for(j=0; j<s->slice_count; j++){

  1226.         FFV1Context *fs= s->slice_context[j];

  1227.         for(i=0; i<s->plane_count; i++){

  1228.             PlaneContext *p= &fs->plane[i];

  1229. 

  1230.             av_freep(&p->state);

  1231.             av_freep(&p->vlc_state);

  1232.         }

  1233.         av_freep(&fs->sample_buffer);

  1234.     }

  1235. 

  1236.     av_freep(&avctx->stats_out);

  1237.     for(j=0; j<s->quant_table_count; j++){

  1238.         av_freep(&s->initial_states[j]);

  1239.         for(i=0; i<s->slice_count; i++){

  1240.             FFV1Context *sf= s->slice_context[i];

  1241.             av_freep(&sf->rc_stat2[j]);

  1242.         }

  1243.         av_freep(&s->rc_stat2[j]);

  1244.     }

  1245. 

  1246.     return 0;

  1247. }

  1248. 

  1249. static av_always_inline void decode_line(FFV1Context *s, int w, int_fast16_t *sample[2], int plane_index, int bits){

  1250.     PlaneContext * const p= &s->plane[plane_index];

  1251.     RangeCoder * const c= &s->c;

  1252.     int x;

  1253.     int run_count=0;

  1254.     int run_mode=0;

  1255.     int run_index= s->run_index;

  1256. 

  1257.     for(x=0; x<w; x++){

  1258.         int diff, context, sign;

  1259. 

  1260.         context= get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);

  1261.         if(context < 0){

  1262.             context= -context;

  1263.             sign=1;

  1264.         }else

  1265.             sign=0;

  1266. 

  1267.         av_assert2(context < p->context_count);

  1268. 

  1269.         if(s->ac){

  1270.             diff= get_symbol_inline(c, p->state[context], 1);

  1271.         }else{

  1272.             if(context == 0 && run_mode==0) run_mode=1;

  1273. 

  1274.             if(run_mode){

  1275.                 if(run_count==0 && run_mode==1){

  1276.                     if(get_bits1(&s->gb)){

  1277.                         run_count = 1<<ff_log2_run[run_index];

  1278.                         if(x + run_count <= w) run_index++;

  1279.                     }else{

  1280.                         if(ff_log2_run[run_index]) run_count = get_bits(&s->gb, ff_log2_run[run_index]);

  1281.                         else run_count=0;

  1282.                         if(run_index) run_index--;

  1283.                         run_mode=2;

  1284.                     }

  1285.                 }

  1286.                 run_count--;

  1287.                 if(run_count < 0){

  1288.                     run_mode=0;

  1289.                     run_count=0;

  1290.                     diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1291.                     if(diff>=0) diff++;

  1292.                 }else

  1293.                     diff=0;

  1294.             }else

  1295.                 diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1296. 

  1297. //            printf("count:%d index:%d, mode:%d, x:%d y:%d pos:%d\n", run_count, run_index, run_mode, x, y, get_bits_count(&s->gb));

  1298.         }

  1299. 

  1300.         if(sign) diff= -diff;

  1301. 

  1302.         sample[1][x]= (predict(sample[1] + x, sample[0] + x) + diff) & ((1<<bits)-1);

  1303.     }

  1304.     s->run_index= run_index;

  1305. }

  1306. 

  1307. static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){

  1308.     int x, y;

  1309.     int_fast16_t *sample[2];

  1310.     sample[0]=s->sample_buffer    +3;

  1311.     sample[1]=s->sample_buffer+w+6+3;

  1312. 

  1313.     s->run_index=0;

  1314. 

  1315.     memset(s->sample_buffer, 0, 2*(w+6)*sizeof(*s->sample_buffer));

  1316. 

  1317.     for(y=0; y<h; y++){

  1318.         int_fast16_t *temp= sample[0]; //FIXME try a normal buffer

  1319. 

  1320.         sample[0]= sample[1];

  1321.         sample[1]= temp;

  1322. 

  1323.         sample[1][-1]= sample[0][0  ];

  1324.         sample[0][ w]= sample[0][w-1];

  1325. 

  1326. //{START_TIMER

  1327.         if(s->avctx->bits_per_raw_sample <= 8){

  1328.             decode_line(s, w, sample, plane_index, 8);

  1329.             for(x=0; x<w; x++){

  1330.                 src[x + stride*y]= sample[1][x];

  1331.             }

  1332.         }else{

  1333.             decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

  1334.             for(x=0; x<w; x++){

  1335.                 ((uint16_t*)(src + stride*y))[x]= sample[1][x] << (16 - s->avctx->bits_per_raw_sample);

  1336.             }

  1337.         }

  1338. //STOP_TIMER("decode-line")}

  1339.     }

  1340. }

  1341. 

  1342. static void decode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){

  1343.     int x, y, p;

  1344.     int_fast16_t *sample[3][2];

  1345.     for(x=0; x<3; x++){

  1346.         sample[x][0] = s->sample_buffer +  x*2   *(w+6) + 3;

  1347.         sample[x][1] = s->sample_buffer + (x*2+1)*(w+6) + 3;

  1348.     }

  1349. 

  1350.     s->run_index=0;

  1351. 

  1352.     memset(s->sample_buffer, 0, 6*(w+6)*sizeof(*s->sample_buffer));

  1353. 

  1354.     for(y=0; y<h; y++){

  1355.         for(p=0; p<3; p++){

  1356.             int_fast16_t *temp= sample[p][0]; //FIXME try a normal buffer

  1357. 

  1358.             sample[p][0]= sample[p][1];

  1359.             sample[p][1]= temp;

  1360. 

  1361.             sample[p][1][-1]= sample[p][0][0  ];

  1362.             sample[p][0][ w]= sample[p][0][w-1];

  1363.             decode_line(s, w, sample[p], FFMIN(p, 1), 9);

  1364.         }

  1365.         for(x=0; x<w; x++){

  1366.             int g= sample[0][1][x];

  1367.             int b= sample[1][1][x];

  1368.             int r= sample[2][1][x];

  1369. 

  1370. //            assert(g>=0 && b>=0 && r>=0);

  1371. //            assert(g<256 && b<512 && r<512);

  1372. 

  1373.             b -= 0x100;

  1374.             r -= 0x100;

  1375.             g -= (b + r)>>2;

  1376.             b += g;

  1377.             r += g;

  1378. 

  1379.             src[x + stride*y]= b + (g<<8) + (r<<16) + (0xFF<<24);

  1380.         }

  1381.     }

  1382. }

  1383. 

  1384. static int decode_slice(AVCodecContext *c, void *arg){

  1385.     FFV1Context *fs= *(void**)arg;

  1386.     FFV1Context *f= fs->avctx->priv_data;

  1387.     int width = fs->slice_width;

  1388.     int height= fs->slice_height;

  1389.     int x= fs->slice_x;

  1390.     int y= fs->slice_y;

  1391.     AVFrame * const p= &f->picture;

  1392. 

  1393.     av_assert1(width && height);

  1394.     if(f->colorspace==0){

  1395.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1396.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1397.         const int cx= x>>f->chroma_h_shift;

  1398.         const int cy= y>>f->chroma_v_shift;

  1399.         decode_plane(fs, p->data[0] + x + y*p->linesize[0], width, height, p->linesize[0], 0);

  1400. 

  1401.         decode_plane(fs, p->data[1] + cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  1402.         decode_plane(fs, p->data[2] + cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[2], 1);

  1403.     }else{

  1404.         decode_rgb_frame(fs, (uint32_t*)p->data[0] + x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1405.     }

  1406. 

  1407.     emms_c();

  1408. 

  1409.     return 0;

  1410. }

  1411. 

  1412. static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale){

  1413.     int v;

  1414.     int i=0;

  1415.     uint8_t state[CONTEXT_SIZE];

  1416. 

  1417.     memset(state, 128, sizeof(state));

  1418. 

  1419.     for(v=0; i<128 ; v++){

  1420.         int len= get_symbol(c, state, 0) + 1;

  1421. 

  1422.         if(len + i > 128) return -1;

  1423. 

  1424.         while(len--){

  1425.             quant_table[i] = scale*v;

  1426.             i++;

  1427. //printf("%2d ",v);

  1428. //if(i%16==0) printf("\n");

  1429.         }

  1430.     }

  1431. 

  1432.     for(i=1; i<128; i++){

  1433.         quant_table[256-i]= -quant_table[i];

  1434.     }

  1435.     quant_table[128]= -quant_table[127];

  1436. 

  1437.     return 2*v - 1;

  1438. }

  1439. 

  1440. static int read_quant_tables(RangeCoder *c, int16_t quant_table[MAX_CONTEXT_INPUTS][256]){

  1441.     int i;

  1442.     int context_count=1;

  1443. 

  1444.     for(i=0; i<5; i++){

  1445.         context_count*= read_quant_table(c, quant_table[i], context_count);

  1446.         if(context_count > 32768U){

  1447.             return -1;

  1448.         }

  1449.     }

  1450.     return (context_count+1)/2;

  1451. }

  1452. 

  1453. static int read_extra_header(FFV1Context *f){

  1454.     RangeCoder * const c= &f->c;

  1455.     uint8_t state[CONTEXT_SIZE];

  1456.     int i, j, k;

  1457.     uint8_t state2[32][CONTEXT_SIZE];

  1458. 

  1459.     memset(state2, 128, sizeof(state2));

  1460.     memset(state, 128, sizeof(state));

  1461. 

  1462.     ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);

  1463.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1464. 

  1465.     f->version= get_symbol(c, state, 0);

  1466.     f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1467.     if(f->ac>1){

  1468.         for(i=1; i<256; i++){

  1469.             f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1470.         }

  1471.     }

  1472.     f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1473.     f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1474.     get_rac(c, state); //no chroma = false

  1475.     f->chroma_h_shift= get_symbol(c, state, 0);

  1476.     f->chroma_v_shift= get_symbol(c, state, 0);

  1477.     get_rac(c, state); //transparency plane

  1478.     f->plane_count= 2;

  1479.     f->num_h_slices= 1 + get_symbol(c, state, 0);

  1480.     f->num_v_slices= 1 + get_symbol(c, state, 0);

  1481.     if(f->num_h_slices > (unsigned)f->width || f->num_v_slices > (unsigned)f->height){

  1482.         av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");

  1483.         return -1;

  1484.     }

  1485. 

  1486.     f->quant_table_count= get_symbol(c, state, 0);

  1487.     if(f->quant_table_count > (unsigned)MAX_QUANT_TABLES)

  1488.         return -1;

  1489.     for(i=0; i<f->quant_table_count; i++){

  1490.         if((f->context_count[i]= read_quant_tables(c, f->quant_tables[i])) < 0){

  1491.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1492.             return -1;

  1493.         }

  1494.     }

  1495. 

  1496.     if(allocate_initial_states(f) < 0)

  1497.         return AVERROR(ENOMEM);

  1498. 

  1499.     for(i=0; i<f->quant_table_count; i++){

  1500.         if(get_rac(c, state)){

  1501.             for(j=0; j<f->context_count[i]; j++){

  1502.                 for(k=0; k<CONTEXT_SIZE; k++){

  1503.                     int pred= j ? f->initial_states[i][j-1][k] : 128;

  1504.                     f->initial_states[i][j][k]= (pred+get_symbol(c, state2[k], 1))&0xFF;

  1505.                 }

  1506.             }

  1507.         }

  1508.     }

  1509. 

  1510.     return 0;

  1511. }

  1512. 

  1513. static int read_header(FFV1Context *f){

  1514.     uint8_t state[CONTEXT_SIZE];

  1515.     int i, j, context_count;

  1516.     RangeCoder * const c= &f->slice_context[0]->c;

  1517. 

  1518.     memset(state, 128, sizeof(state));

  1519. 

  1520.     if(f->version < 2){

  1521.         f->version= get_symbol(c, state, 0);

  1522.         f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1523.         if(f->ac>1){

  1524.             for(i=1; i<256; i++){

  1525.                 f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1526.             }

  1527.         }

  1528.         f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1529.         if(f->version>0)

  1530.             f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1531.         get_rac(c, state); //no chroma = false

  1532.         f->chroma_h_shift= get_symbol(c, state, 0);

  1533.         f->chroma_v_shift= get_symbol(c, state, 0);

  1534.         get_rac(c, state); //transparency plane

  1535.         f->plane_count= 2;

  1536.     }

  1537. 

  1538.     if(f->colorspace==0){

  1539.         if(f->avctx->bits_per_raw_sample<=8){

  1540.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1541.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;

  1542.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;

  1543.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;

  1544.             case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;

  1545.             case 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  1546.             default:

  1547.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1548.                 return -1;

  1549.             }

  1550.         }else{

  1551.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1552.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1553.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  1554.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P16; break;

  1555.             default:

  1556.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1557.                 return -1;

  1558.             }

  1559.         }

  1560.     }else if(f->colorspace==1){

  1561.         if(f->chroma_h_shift || f->chroma_v_shift){

  1562.             av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");

  1563.             return -1;

  1564.         }

  1565.         f->avctx->pix_fmt= PIX_FMT_RGB32;

  1566.     }else{

  1567.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  1568.         return -1;

  1569.     }

  1570. 

  1571. //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

  1572.     if(f->version < 2){

  1573.         context_count= read_quant_tables(c, f->quant_table);

  1574.         if(context_count < 0){

  1575.                 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1576.                 return -1;

  1577.         }

  1578.     }else{

  1579.         f->slice_count= get_symbol(c, state, 0);

  1580.         if(f->slice_count > (unsigned)MAX_SLICES)

  1581.             return -1;

  1582.     }

  1583. 

  1584.     for(j=0; j<f->slice_count; j++){

  1585.         FFV1Context *fs= f->slice_context[j];

  1586.         fs->ac= f->ac;

  1587. 

  1588.         if(f->version >= 2){

  1589.             fs->slice_x     = get_symbol(c, state, 0)   *f->width ;

  1590.             fs->slice_y     = get_symbol(c, state, 0)   *f->height;

  1591.             fs->slice_width =(get_symbol(c, state, 0)+1)*f->width  + fs->slice_x;

  1592.             fs->slice_height=(get_symbol(c, state, 0)+1)*f->height + fs->slice_y;

  1593. 

  1594.             fs->slice_x /= f->num_h_slices;

  1595.             fs->slice_y /= f->num_v_slices;

  1596.             fs->slice_width  = fs->slice_width /f->num_h_slices - fs->slice_x;

  1597.             fs->slice_height = fs->slice_height/f->num_v_slices - fs->slice_y;

  1598.             if((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height)

  1599.                 return -1;

  1600.             if(    (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width

  1601.                 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

  1602.                 return -1;

  1603.         }

  1604. 

  1605.         for(i=0; i<f->plane_count; i++){

  1606.             PlaneContext * const p= &fs->plane[i];

  1607. 

  1608.             if(f->version >= 2){

  1609.                 int idx=get_symbol(c, state, 0);

  1610.                 if(idx > (unsigned)f->quant_table_count){

  1611.                     av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");

  1612.                     return -1;

  1613.                 }

  1614.                 p->quant_table_index= idx;

  1615.                 memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));

  1616.                 context_count= f->context_count[idx];

  1617.             }else{

  1618.                 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));

  1619.             }

  1620. 

  1621.             if(p->context_count < context_count){

  1622.                 av_freep(&p->state);

  1623.                 av_freep(&p->vlc_state);

  1624.             }

  1625.             p->context_count= context_count;

  1626.         }

  1627.     }

  1628. 

  1629.     return 0;

  1630. }

  1631. 

  1632. static av_cold int decode_init(AVCodecContext *avctx)

  1633. {

  1634.     FFV1Context *f = avctx->priv_data;

  1635. 

  1636.     common_init(avctx);

  1637. 

  1638.     if(avctx->extradata && read_extra_header(f) < 0)

  1639.         return -1;

  1640. 

  1641.     if(init_slice_contexts(f) < 0)

  1642.         return -1;

  1643. 

  1644.     return 0;

  1645. }

  1646. 

  1647. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  1648.     const uint8_t *buf = avpkt->data;

  1649.     int buf_size = avpkt->size;

  1650.     FFV1Context *f = avctx->priv_data;

  1651.     RangeCoder * const c= &f->slice_context[0]->c;

  1652.     AVFrame * const p= &f->picture;

  1653.     int bytes_read, i;

  1654.     uint8_t keystate= 128;

  1655.     const uint8_t *buf_p;

  1656. 

  1657.     AVFrame *picture = data;

  1658. 

  1659.     ff_init_range_decoder(c, buf, buf_size);

  1660.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1661. 

  1662. 

  1663.     p->pict_type= FF_I_TYPE; //FIXME I vs. P

  1664.     if(get_rac(c, &keystate)){

  1665.         p->key_frame= 1;

  1666.         if(read_header(f) < 0)

  1667.             return -1;

  1668.         if(init_slice_state(f) < 0)

  1669.             return -1;

  1670. 

  1671.         clear_state(f);

  1672.     }else{

  1673.         p->key_frame= 0;

  1674.     }

  1675.     if(f->ac>1){

  1676.         int i;

  1677.         for(i=1; i<256; i++){

  1678.             c->one_state[i]= f->state_transition[i];

  1679.             c->zero_state[256-i]= 256-c->one_state[i];

  1680.         }

  1681.     }

  1682. 

  1683.     p->reference= 0;

  1684.     if(avctx->get_buffer(avctx, p) < 0){

  1685.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1686.         return -1;

  1687.     }

  1688. 

  1689.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  1690.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  1691. 

  1692.     if(!f->ac){

  1693.         bytes_read = c->bytestream - c->bytestream_start - 1;

  1694.         if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME

  1695. //printf("pos=%d\n", bytes_read);

  1696.         init_get_bits(&f->slice_context[0]->gb, buf + bytes_read, buf_size - bytes_read);

  1697.     } else {

  1698.         bytes_read = 0; /* avoid warning */

  1699.     }

  1700. 

  1701.     buf_p= buf + buf_size;

  1702.     for(i=f->slice_count-1; i>0; i--){

  1703.         FFV1Context *fs= f->slice_context[i];

  1704.         int v= AV_RB24(buf_p-3)+3;

  1705.         if(buf_p - buf <= v){

  1706.             av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");

  1707.             return -1;

  1708.         }

  1709.         buf_p -= v;

  1710.         if(fs->ac){

  1711.             ff_init_range_decoder(&fs->c, buf_p, v);

  1712.         }else{

  1713.             init_get_bits(&fs->gb, buf_p, v);

  1714.         }

  1715.     }

  1716. 

  1717.     avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1718.     f->picture_number++;

  1719. 

  1720.     *picture= *p;

  1721. 

  1722.     avctx->release_buffer(avctx, p); //FIXME

  1723. 

  1724.     *data_size = sizeof(AVFrame);

  1725. 

  1726.     return buf_size;

  1727. }

  1728. 

  1729. AVCodec ffv1_decoder = {

  1730.     "ffv1",

  1731.     AVMEDIA_TYPE_VIDEO,

  1732.     CODEC_ID_FFV1,

  1733.     sizeof(FFV1Context),

  1734.     decode_init,

  1735.     NULL,

  1736.     common_end,

  1737.     decode_frame,

  1738.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1739.     NULL,

  1740.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1741. };

  1742. 

  1743. #if CONFIG_FFV1_ENCODER

  1744. AVCodec ffv1_encoder = {

  1745.     "ffv1",

  1746.     AVMEDIA_TYPE_VIDEO,

  1747.     CODEC_ID_FFV1,

  1748.     sizeof(FFV1Context),

  1749.     encode_init,

  1750.     encode_frame,

  1751.     common_end,

  1752.     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_RGB32, PIX_FMT_YUV420P16, PIX_FMT_YUV422P16, PIX_FMT_YUV444P16, PIX_FMT_NONE},

  1753.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1754. };

  1755. #endif