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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.     int version;

  237.     int width, height;

  238.     int chroma_h_shift, chroma_v_shift;

  239.     int flags;

  240.     int picture_number;

  241.     AVFrame picture;

  242.     int plane_count;

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

  244.     PlaneContext plane[MAX_PLANES];

  245.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

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

  247.     int context_count[MAX_QUANT_TABLES];

  248.     uint8_t state_transition[256];

  249.     int run_index;

  250.     int colorspace;

  251.     int_fast16_t *sample_buffer;

  252. 

  253.     int quant_table_count;

  254. 

  255.     DSPContext dsp;

  256. 

  257.     struct FFV1Context *slice_context[MAX_SLICES];

  258.     int slice_count;

  259.     int num_v_slices;

  260.     int num_h_slices;

  261.     int slice_width;

  262.     int slice_height;

  263.     int slice_x;

  264.     int slice_y;

  265. }FFV1Context;

  266. 

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

  268.     if(bits==8)

  269.         diff= (int8_t)diff;

  270.     else{

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

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

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

  274.     }

  275. 

  276.     return diff;

  277. }

  278. 

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

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

  281.     const int  T= last[ 0];

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

  283. 

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

  285. }

  286. 

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

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

  289.     const int  T= last[ 0];

  290.     const int RT= last[ 1];

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

  292. 

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

  294.         const int TT= last2[0];

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

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

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

  298.     }else

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

  300. }

  301. 

  302. 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]){

  303.     int i;

  304. 

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

  306. do{\

  307.     if(rc_stat){\

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

  309.     }\

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

  311. }while(0)

  312. 

  313.     if(v){

  314.         const int a= FFABS(v);

  315.         const int e= av_log2(a);

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

  317.         if(e<=9){

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

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

  320.             }

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

  322. 

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

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

  325.             }

  326. 

  327.             if(is_signed)

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

  329.         }else{

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

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

  332.             }

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

  334. 

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

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

  337.             }

  338. 

  339.             if(is_signed)

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

  341.         }

  342.     }else{

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

  344.     }

  345. #undef put_rac

  346. }

  347. 

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

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

  350. }

  351. 

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

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

  354.         return 0;

  355.     else{

  356.         int i, e, a;

  357.         e= 0;

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

  359.             e++;

  360.         }

  361. 

  362.         a= 1;

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

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

  365.         }

  366. 

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

  368.         return (a^e)-e;

  369.     }

  370. }

  371. 

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

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

  374. }

  375. 

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

  377.     int drift= state->drift;

  378.     int count= state->count;

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

  380.     drift += v;

  381. 

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

  383.         count >>= 1;

  384.         drift >>= 1;

  385.         state->error_sum >>= 1;

  386.     }

  387.     count++;

  388. 

  389.     if(drift <= -count){

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

  391. 

  392.         drift += count;

  393.         if(drift <= -count)

  394.             drift= -count + 1;

  395.     }else if(drift > 0){

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

  397. 

  398.         drift -= count;

  399.         if(drift > 0)

  400.             drift= 0;

  401.     }

  402. 

  403.     state->drift= drift;

  404.     state->count= count;

  405. }

  406. 

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

  408.     int i, k, code;

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

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

  411. 

  412.     i= state->count;

  413.     k=0;

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

  415.         k++;

  416.         i += i;

  417.     }

  418. 

  419.     assert(k<=8);

  420. 

  421. #if 0 // JPEG LS

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

  423.     else                                         code= v;

  424. #else

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

  426. #endif

  427. 

  428. //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);

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

  430. 

  431.     update_vlc_state(state, v);

  432. }

  433. 

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

  435.     int k, i, v, ret;

  436. 

  437.     i= state->count;

  438.     k=0;

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

  440.         k++;

  441.         i += i;

  442.     }

  443. 

  444.     assert(k<=8);

  445. 

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

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

  448. 

  449. #if 0 // JPEG LS

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

  451. #else

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

  453. #endif

  454. 

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

  456. 

  457.     update_vlc_state(state, v);

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

  459.     return ret;

  460. }

  461. 

  462. #if CONFIG_FFV1_ENCODER

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

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

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

  466.     int x;

  467.     int run_index= s->run_index;

  468.     int run_count=0;

  469.     int run_mode=0;

  470. 

  471.     if(s->ac){

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

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

  474.             return -1;

  475.         }

  476.     }else{

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

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

  479.             return -1;

  480.         }

  481.     }

  482. 

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

  484.         int diff, context;

  485. 

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

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

  488. 

  489.         if(context < 0){

  490.             context = -context;

  491.             diff= -diff;

  492.         }

  493. 

  494.         diff= fold(diff, bits);

  495. 

  496.         if(s->ac){

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

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

  499.             }else{

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

  501.             }

  502.         }else{

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

  504. 

  505.             if(run_mode){

  506. 

  507.                 if(diff){

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

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

  510.                         run_index++;

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

  512.                     }

  513. 

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

  515.                     if(run_index) run_index--;

  516.                     run_count=0;

  517.                     run_mode=0;

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

  519.                 }else{

  520.                     run_count++;

  521.                 }

  522.             }

  523. 

  524. //            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));

  525. 

  526.             if(run_mode == 0)

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

  528.         }

  529.     }

  530.     if(run_mode){

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

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

  533.             run_index++;

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

  535.         }

  536. 

  537.         if(run_count)

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

  539.     }

  540.     s->run_index= run_index;

  541. 

  542.     return 0;

  543. }

  544. 

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

  546.     int x,y,i;

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

  548.     int_fast16_t *sample[3];

  549.     s->run_index=0;

  550. 

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

  552. 

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

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

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

  556. 

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

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

  559. //{START_TIMER

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

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

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

  563.             }

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

  565.         }else{

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

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

  568.             }

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

  570.         }

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

  572.     }

  573. }

  574. 

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

  576.     int x, y, p, i;

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

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

  579.     s->run_index=0;

  580. 

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

  582. 

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

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

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

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

  587. 

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

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

  590.             int b= v&0xFF;

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

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

  593. 

  594.             b -= g;

  595.             r -= g;

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

  597.             b += 0x100;

  598.             r += 0x100;

  599. 

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

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

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

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

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

  605.         }

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

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

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

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

  610.         }

  611.     }

  612. }

  613. 

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

  615.     int last=0;

  616.     int i;

  617.     uint8_t state[CONTEXT_SIZE];

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

  619. 

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

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

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

  623.             last= i;

  624.         }

  625.     }

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

  627. }

  628. 

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

  630.     int i;

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

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

  633. }

  634. 

  635. static void write_header(FFV1Context *f){

  636.     uint8_t state[CONTEXT_SIZE];

  637.     int i, j;

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

  639. 

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

  641. 

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

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

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

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

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

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

  648.             }

  649.         }

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

  651.         if(f->version>0)

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

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

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

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

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

  657. 

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

  659.     }else{

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

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

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

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

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

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

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

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

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

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

  670.             }

  671.         }

  672.     }

  673. }

  674. #endif /* CONFIG_FFV1_ENCODER */

  675. 

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

  677.     FFV1Context *s = avctx->priv_data;

  678. 

  679.     s->avctx= avctx;

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

  681. 

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

  683. 

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

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

  686. 

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

  688.     //defaults

  689.     s->num_h_slices=1;

  690.     s->num_v_slices=1;

  691. 

  692. 

  693.     return 0;

  694. }

  695. 

  696. static int init_slice_state(FFV1Context *f){

  697.     int i, j;

  698. 

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

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

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

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

  703. 

  704.             if(fs->ac){

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

  706.                 if(!p->    state)

  707.                     return AVERROR(ENOMEM);

  708.             }else{

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

  710.                 if(!p->vlc_state)

  711.                     return AVERROR(ENOMEM);

  712.             }

  713.         }

  714. 

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

  716.             //FIXME only redo if state_transition changed

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

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

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

  720.             }

  721.         }

  722.     }

  723. 

  724.     return 0;

  725. }

  726. 

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

  728.     int i;

  729. 

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

  731. 

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

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

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

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

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

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

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

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

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

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

  742. 

  743.         fs->slice_width = sxe - sxs;

  744.         fs->slice_height= sye - sys;

  745.         fs->slice_x     = sxs;

  746.         fs->slice_y     = sys;

  747. 

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

  749.         if (!fs->sample_buffer)

  750.             return AVERROR(ENOMEM);

  751.     }

  752.     return 0;

  753. }

  754. 

  755. #if CONFIG_FFV1_ENCODER

  756. static int write_extra_header(FFV1Context *f){

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

  758.     uint8_t state[CONTEXT_SIZE];

  759.     int i;

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

  761. 

  762.     f->avctx->extradata= av_malloc(f->avctx->extradata_size= 10000);

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

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

  765. 

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

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

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

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

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

  771.         }

  772.     }

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

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

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

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

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

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

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

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

  781. 

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

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

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

  785. 

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

  787. 

  788.     return 0;

  789. }

  790. 

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

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

  793. 

  794.     do{

  795.         changed=0;

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

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

  798. #define COST(old, new) \

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

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

  801. 

  802. #define COST2(old, new) \

  803.     COST(old, new)\

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

  805. 

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

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

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

  809.                     int j;

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

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

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

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

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

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

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

  817.                     }

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

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

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

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

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

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

  824.                         }

  825.                     }

  826.                     print=changed=1;

  827.                 }

  828.             }

  829.         }

  830.     }while(changed);

  831.     return print;

  832. }

  833. 

  834. static av_cold int encode_init(AVCodecContext *avctx)

  835. {

  836.     FFV1Context *s = avctx->priv_data;

  837.     int i, j;

  838. 

  839.     common_init(avctx);

  840. 

  841.     s->version=0;

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

  843. 

  844.     if(s->ac>1)

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

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

  847. 

  848.     s->plane_count=2;

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

  850.         s->quant_table_count=2;

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

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

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

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

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

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

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

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

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

  860.         }else{

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

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

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

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

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

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

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

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

  869.         }

  870.     }

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

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

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

  874. 

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

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

  877. 

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

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

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

  881.     }

  882. 

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

  884.     switch(avctx->pix_fmt){

  885.     case PIX_FMT_YUV444P16:

  886.     case PIX_FMT_YUV422P16:

  887.     case PIX_FMT_YUV420P16:

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

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

  890.             return -1;

  891.         }

  892.         if(!s->ac){

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

  894.             return -1;

  895.         }

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

  897.     case PIX_FMT_YUV444P:

  898.     case PIX_FMT_YUV422P:

  899.     case PIX_FMT_YUV420P:

  900.     case PIX_FMT_YUV411P:

  901.     case PIX_FMT_YUV410P:

  902.         s->colorspace= 0;

  903.         break;

  904.     case PIX_FMT_RGB32:

  905.         s->colorspace= 1;

  906.         break;

  907.     default:

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

  909.         return -1;

  910.     }

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

  912. 

  913.     s->picture_number=0;

  914. 

  915.     if(avctx->stats_in){

  916.         char *p= avctx->stats_in;

  917. 

  918.         for(;;){

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

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

  921.                     char *next;

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

  923.                     if(next==p){

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

  925.                         return -1;

  926.                     }

  927.                     p=next;

  928.                 }

  929.             }

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

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

  932.         }

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

  934.     }

  935. 

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

  937.         s->num_h_slices=2;

  938.         s->num_v_slices=2;

  939.         write_extra_header(s);

  940.     }

  941. 

  942.     if(init_slice_contexts(s) < 0)

  943.         return -1;

  944.     if(init_slice_state(s) < 0)

  945.         return -1;

  946. 

  947.     avctx->stats_out= av_mallocz(1024*30);

  948. 

  949.     return 0;

  950. }

  951. #endif /* CONFIG_FFV1_ENCODER */

  952. 

  953. 

  954. static void clear_state(FFV1Context *f){

  955.     int i, si, j;

  956. 

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

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

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

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

  961. 

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

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

  964. 

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

  966.                 if(fs->ac){

  967.                     memset(p->state[j], 128, sizeof(uint8_t)*CONTEXT_SIZE);

  968.                 }else{

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

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

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

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

  973.                 }

  974.             }

  975.         }

  976.     }

  977. }

  978. 

  979. #if CONFIG_FFV1_ENCODER

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

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

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

  983.     int width = fs->slice_width;

  984.     int height= fs->slice_height;

  985.     int x= fs->slice_x;

  986.     int y= fs->slice_y;

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

  988. 

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

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

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

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

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

  994. 

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

  996. 

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

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

  999.     }else{

  1000.         encode_rgb_frame(fs, (uint32_t*)(p->data[0]) + x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1001.     }

  1002.     emms_c();

  1003. 

  1004.     return 0;

  1005. }

  1006. 

  1007. static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

  1008.     FFV1Context *f = avctx->priv_data;

  1009.     RangeCoder * const c= &f->slice_context[0]->c;

  1010.     AVFrame *pict = data;

  1011.     AVFrame * const p= &f->picture;

  1012.     int used_count= 0;

  1013.     uint8_t keystate=128;

  1014.     uint8_t *buf_p;

  1015.     int i;

  1016. 

  1017.     ff_init_range_encoder(c, buf, buf_size);

  1018.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1019. 

  1020.     *p = *pict;

  1021.     p->pict_type= FF_I_TYPE;

  1022. 

  1023.     if(avctx->gop_size==0 || f->picture_number % avctx->gop_size == 0){

  1024.         put_rac(c, &keystate, 1);

  1025.         p->key_frame= 1;

  1026.         write_header(f);

  1027.         clear_state(f);

  1028.     }else{

  1029.         put_rac(c, &keystate, 0);

  1030.         p->key_frame= 0;

  1031.     }

  1032. 

  1033.     if(!f->ac){

  1034.         used_count += ff_rac_terminate(c);

  1035. //printf("pos=%d\n", used_count);

  1036.         init_put_bits(&f->slice_context[0]->pb, buf + used_count, buf_size - used_count);

  1037.     }else if (f->ac>1){

  1038.         int i;

  1039.         for(i=1; i<256; i++){

  1040.             c->one_state[i]= f->state_transition[i];

  1041.             c->zero_state[256-i]= 256-c->one_state[i];

  1042.         }

  1043.     }

  1044. 

  1045.     for(i=1; i<f->slice_count; i++){

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

  1047.         uint8_t *start= buf + (buf_size-used_count)*i/f->slice_count;

  1048.         int len= buf_size/f->slice_count;

  1049. 

  1050.         if(fs->ac){

  1051.             ff_init_range_encoder(&fs->c, start, len);

  1052.         }else{

  1053.             init_put_bits(&fs->pb, start, len);

  1054.         }

  1055.     }

  1056.     avctx->execute(avctx, encode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1057. 

  1058.     buf_p=buf;

  1059.     for(i=0; i<f->slice_count; i++){

  1060.         FFV1Context *fs= f->slice_context[i];

  1061.         int bytes;

  1062. 

  1063.         if(fs->ac){

  1064.             uint8_t state=128;

  1065.             put_rac(&fs->c, &state, 0);

  1066.             bytes= ff_rac_terminate(&fs->c);

  1067.         }else{

  1068.             flush_put_bits(&fs->pb); //nicer padding FIXME

  1069.             bytes= used_count + (put_bits_count(&fs->pb)+7)/8;

  1070.             used_count= 0;

  1071.         }

  1072.         if(i>0){

  1073.             av_assert0(bytes < buf_size/f->slice_count);

  1074.             memmove(buf_p, fs->ac ? fs->c.bytestream_start : fs->pb.buf, bytes);

  1075.             av_assert0(bytes < (1<<24));

  1076.             AV_WB24(buf_p+bytes, bytes);

  1077.             bytes+=3;

  1078.         }

  1079.         buf_p += bytes;

  1080.     }

  1081. 

  1082.     if((avctx->flags&CODEC_FLAG_PASS1) && (f->picture_number&31)==0){

  1083.         int j;

  1084.         char *p= avctx->stats_out;

  1085.         char *end= p + 1024*30;

  1086. 

  1087.         memset(f->rc_stat, 0, sizeof(f->rc_stat));

  1088.         for(j=0; j<f->slice_count; j++){

  1089.             FFV1Context *fs= f->slice_context[j];

  1090.             for(i=0; i<256; i++){

  1091.                 f->rc_stat[i][0] += fs->rc_stat[i][0];

  1092.                 f->rc_stat[i][1] += fs->rc_stat[i][1];

  1093.             }

  1094.         }

  1095. 

  1096.         for(j=0; j<256; j++){

  1097.             snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat[j][0], f->rc_stat[j][1]);

  1098.             p+= strlen(p);

  1099.         }

  1100.         snprintf(p, end-p, "\n");

  1101.     } else

  1102.         avctx->stats_out[0] = '\0';

  1103. 

  1104.     f->picture_number++;

  1105.     return buf_p-buf;

  1106. }

  1107. #endif /* CONFIG_FFV1_ENCODER */

  1108. 

  1109. static av_cold int common_end(AVCodecContext *avctx){

  1110.     FFV1Context *s = avctx->priv_data;

  1111.     int i, j;

  1112. 

  1113.     for(j=0; j<s->slice_count; j++){

  1114.         FFV1Context *fs= s->slice_context[j];

  1115.         for(i=0; i<s->plane_count; i++){

  1116.             PlaneContext *p= &fs->plane[i];

  1117. 

  1118.             av_freep(&p->state);

  1119.             av_freep(&p->vlc_state);

  1120.         }

  1121.         av_freep(&fs->sample_buffer);

  1122.     }

  1123. 

  1124.     av_freep(&avctx->stats_out);

  1125. 

  1126.     return 0;

  1127. }

  1128. 

  1129. static av_always_inline void decode_line(FFV1Context *s, int w, int_fast16_t *sample[2], int plane_index, int bits){

  1130.     PlaneContext * const p= &s->plane[plane_index];

  1131.     RangeCoder * const c= &s->c;

  1132.     int x;

  1133.     int run_count=0;

  1134.     int run_mode=0;

  1135.     int run_index= s->run_index;

  1136. 

  1137.     for(x=0; x<w; x++){

  1138.         int diff, context, sign;

  1139. 

  1140.         context= get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);

  1141.         if(context < 0){

  1142.             context= -context;

  1143.             sign=1;

  1144.         }else

  1145.             sign=0;

  1146. 

  1147.         av_assert2(context < p->context_count);

  1148. 

  1149.         if(s->ac){

  1150.             diff= get_symbol_inline(c, p->state[context], 1);

  1151.         }else{

  1152.             if(context == 0 && run_mode==0) run_mode=1;

  1153. 

  1154.             if(run_mode){

  1155.                 if(run_count==0 && run_mode==1){

  1156.                     if(get_bits1(&s->gb)){

  1157.                         run_count = 1<<ff_log2_run[run_index];

  1158.                         if(x + run_count <= w) run_index++;

  1159.                     }else{

  1160.                         if(ff_log2_run[run_index]) run_count = get_bits(&s->gb, ff_log2_run[run_index]);

  1161.                         else run_count=0;

  1162.                         if(run_index) run_index--;

  1163.                         run_mode=2;

  1164.                     }

  1165.                 }

  1166.                 run_count--;

  1167.                 if(run_count < 0){

  1168.                     run_mode=0;

  1169.                     run_count=0;

  1170.                     diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1171.                     if(diff>=0) diff++;

  1172.                 }else

  1173.                     diff=0;

  1174.             }else

  1175.                 diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1176. 

  1177. //            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));

  1178.         }

  1179. 

  1180.         if(sign) diff= -diff;

  1181. 

  1182.         sample[1][x]= (predict(sample[1] + x, sample[0] + x) + diff) & ((1<<bits)-1);

  1183.     }

  1184.     s->run_index= run_index;

  1185. }

  1186. 

  1187. static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){

  1188.     int x, y;

  1189.     int_fast16_t *sample[2];

  1190.     sample[0]=s->sample_buffer    +3;

  1191.     sample[1]=s->sample_buffer+w+6+3;

  1192. 

  1193.     s->run_index=0;

  1194. 

  1195.     memset(s->sample_buffer, 0, 2*(w+6)*sizeof(*s->sample_buffer));

  1196. 

  1197.     for(y=0; y<h; y++){

  1198.         int_fast16_t *temp= sample[0]; //FIXME try a normal buffer

  1199. 

  1200.         sample[0]= sample[1];

  1201.         sample[1]= temp;

  1202. 

  1203.         sample[1][-1]= sample[0][0  ];

  1204.         sample[0][ w]= sample[0][w-1];

  1205. 

  1206. //{START_TIMER

  1207.         if(s->avctx->bits_per_raw_sample <= 8){

  1208.             decode_line(s, w, sample, plane_index, 8);

  1209.             for(x=0; x<w; x++){

  1210.                 src[x + stride*y]= sample[1][x];

  1211.             }

  1212.         }else{

  1213.             decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

  1214.             for(x=0; x<w; x++){

  1215.                 ((uint16_t*)(src + stride*y))[x]= sample[1][x] << (16 - s->avctx->bits_per_raw_sample);

  1216.             }

  1217.         }

  1218. //STOP_TIMER("decode-line")}

  1219.     }

  1220. }

  1221. 

  1222. static void decode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){

  1223.     int x, y, p;

  1224.     int_fast16_t *sample[3][2];

  1225.     for(x=0; x<3; x++){

  1226.         sample[x][0] = s->sample_buffer +  x*2   *(w+6) + 3;

  1227.         sample[x][1] = s->sample_buffer + (x*2+1)*(w+6) + 3;

  1228.     }

  1229. 

  1230.     s->run_index=0;

  1231. 

  1232.     memset(s->sample_buffer, 0, 6*(w+6)*sizeof(*s->sample_buffer));

  1233. 

  1234.     for(y=0; y<h; y++){

  1235.         for(p=0; p<3; p++){

  1236.             int_fast16_t *temp= sample[p][0]; //FIXME try a normal buffer

  1237. 

  1238.             sample[p][0]= sample[p][1];

  1239.             sample[p][1]= temp;

  1240. 

  1241.             sample[p][1][-1]= sample[p][0][0  ];

  1242.             sample[p][0][ w]= sample[p][0][w-1];

  1243.             decode_line(s, w, sample[p], FFMIN(p, 1), 9);

  1244.         }

  1245.         for(x=0; x<w; x++){

  1246.             int g= sample[0][1][x];

  1247.             int b= sample[1][1][x];

  1248.             int r= sample[2][1][x];

  1249. 

  1250. //            assert(g>=0 && b>=0 && r>=0);

  1251. //            assert(g<256 && b<512 && r<512);

  1252. 

  1253.             b -= 0x100;

  1254.             r -= 0x100;

  1255.             g -= (b + r)>>2;

  1256.             b += g;

  1257.             r += g;

  1258. 

  1259.             src[x + stride*y]= b + (g<<8) + (r<<16) + (0xFF<<24);

  1260.         }

  1261.     }

  1262. }

  1263. 

  1264. static int decode_slice(AVCodecContext *c, void *arg){

  1265.     FFV1Context *fs= *(void**)arg;

  1266.     FFV1Context *f= fs->avctx->priv_data;

  1267.     int width = fs->slice_width;

  1268.     int height= fs->slice_height;

  1269.     int x= fs->slice_x;

  1270.     int y= fs->slice_y;

  1271.     AVFrame * const p= &f->picture;

  1272. 

  1273.     av_assert1(width && height);

  1274.     if(f->colorspace==0){

  1275.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1276.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1277.         const int cx= x>>f->chroma_h_shift;

  1278.         const int cy= y>>f->chroma_v_shift;

  1279.         decode_plane(fs, p->data[0] + x + y*p->linesize[0], width, height, p->linesize[0], 0);

  1280. 

  1281.         decode_plane(fs, p->data[1] + cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  1282.         decode_plane(fs, p->data[2] + cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[2], 1);

  1283.     }else{

  1284.         decode_rgb_frame(fs, (uint32_t*)p->data[0] + x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1285.     }

  1286. 

  1287.     emms_c();

  1288. 

  1289.     return 0;

  1290. }

  1291. 

  1292. static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale){

  1293.     int v;

  1294.     int i=0;

  1295.     uint8_t state[CONTEXT_SIZE];

  1296. 

  1297.     memset(state, 128, sizeof(state));

  1298. 

  1299.     for(v=0; i<128 ; v++){

  1300.         int len= get_symbol(c, state, 0) + 1;

  1301. 

  1302.         if(len + i > 128) return -1;

  1303. 

  1304.         while(len--){

  1305.             quant_table[i] = scale*v;

  1306.             i++;

  1307. //printf("%2d ",v);

  1308. //if(i%16==0) printf("\n");

  1309.         }

  1310.     }

  1311. 

  1312.     for(i=1; i<128; i++){

  1313.         quant_table[256-i]= -quant_table[i];

  1314.     }

  1315.     quant_table[128]= -quant_table[127];

  1316. 

  1317.     return 2*v - 1;

  1318. }

  1319. 

  1320. static int read_quant_tables(RangeCoder *c, int16_t quant_table[MAX_CONTEXT_INPUTS][256]){

  1321.     int i;

  1322.     int context_count=1;

  1323. 

  1324.     for(i=0; i<5; i++){

  1325.         context_count*= read_quant_table(c, quant_table[i], context_count);

  1326.         if(context_count > 32768U){

  1327.             return -1;

  1328.         }

  1329.     }

  1330.     return (context_count+1)/2;

  1331. }

  1332. 

  1333. static int read_extra_header(FFV1Context *f){

  1334.     RangeCoder * const c= &f->c;

  1335.     uint8_t state[CONTEXT_SIZE];

  1336.     int i;

  1337. 

  1338.     memset(state, 128, sizeof(state));

  1339. 

  1340.     ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);

  1341.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1342. 

  1343.     f->version= get_symbol(c, state, 0);

  1344.     f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1345.     if(f->ac>1){

  1346.         for(i=1; i<256; i++){

  1347.             f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1348.         }

  1349.     }

  1350.     f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1351.     f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1352.     get_rac(c, state); //no chroma = false

  1353.     f->chroma_h_shift= get_symbol(c, state, 0);

  1354.     f->chroma_v_shift= get_symbol(c, state, 0);

  1355.     get_rac(c, state); //transparency plane

  1356.     f->plane_count= 2;

  1357.     f->num_h_slices= 1 + get_symbol(c, state, 0);

  1358.     f->num_v_slices= 1 + get_symbol(c, state, 0);

  1359.     if(f->num_h_slices > (unsigned)f->width || f->num_v_slices > (unsigned)f->height){

  1360.         av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");

  1361.         return -1;

  1362.     }

  1363. 

  1364.     f->quant_table_count= get_symbol(c, state, 0);

  1365.     if(f->quant_table_count > (unsigned)MAX_QUANT_TABLES)

  1366.         return -1;

  1367.     for(i=0; i<f->quant_table_count; i++){

  1368.         if((f->context_count[i]= read_quant_tables(c, f->quant_tables[i])) < 0){

  1369.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1370.             return -1;

  1371.         }

  1372.     }

  1373. 

  1374.     return 0;

  1375. }

  1376. 

  1377. static int read_header(FFV1Context *f){

  1378.     uint8_t state[CONTEXT_SIZE];

  1379.     int i, j, context_count;

  1380.     RangeCoder * const c= &f->slice_context[0]->c;

  1381. 

  1382.     memset(state, 128, sizeof(state));

  1383. 

  1384.     if(f->version < 2){

  1385.         f->version= get_symbol(c, state, 0);

  1386.         f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1387.         if(f->ac>1){

  1388.             for(i=1; i<256; i++){

  1389.                 f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1390.             }

  1391.         }

  1392.         f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1393.         if(f->version>0)

  1394.             f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1395.         get_rac(c, state); //no chroma = false

  1396.         f->chroma_h_shift= get_symbol(c, state, 0);

  1397.         f->chroma_v_shift= get_symbol(c, state, 0);

  1398.         get_rac(c, state); //transparency plane

  1399.         f->plane_count= 2;

  1400.     }

  1401. 

  1402.     if(f->colorspace==0){

  1403.         if(f->avctx->bits_per_raw_sample<=8){

  1404.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1405.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;

  1406.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;

  1407.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;

  1408.             case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;

  1409.             case 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  1410.             default:

  1411.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1412.                 return -1;

  1413.             }

  1414.         }else{

  1415.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1416.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1417.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  1418.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P16; break;

  1419.             default:

  1420.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1421.                 return -1;

  1422.             }

  1423.         }

  1424.     }else if(f->colorspace==1){

  1425.         if(f->chroma_h_shift || f->chroma_v_shift){

  1426.             av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");

  1427.             return -1;

  1428.         }

  1429.         f->avctx->pix_fmt= PIX_FMT_RGB32;

  1430.     }else{

  1431.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  1432.         return -1;

  1433.     }

  1434. 

  1435. //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

  1436.     if(f->version < 2){

  1437.         context_count= read_quant_tables(c, f->quant_table);

  1438.         if(context_count < 0){

  1439.                 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1440.                 return -1;

  1441.         }

  1442.     }else{

  1443.         f->slice_count= get_symbol(c, state, 0);

  1444.         if(f->slice_count > (unsigned)MAX_SLICES)

  1445.             return -1;

  1446.     }

  1447. 

  1448.     for(j=0; j<f->slice_count; j++){

  1449.         FFV1Context *fs= f->slice_context[j];

  1450.         fs->ac= f->ac;

  1451. 

  1452.         if(f->version >= 2){

  1453.             fs->slice_x     = get_symbol(c, state, 0)   *f->width ;

  1454.             fs->slice_y     = get_symbol(c, state, 0)   *f->height;

  1455.             fs->slice_width =(get_symbol(c, state, 0)+1)*f->width  + fs->slice_x;

  1456.             fs->slice_height=(get_symbol(c, state, 0)+1)*f->height + fs->slice_y;

  1457. 

  1458.             fs->slice_x /= f->num_h_slices;

  1459.             fs->slice_y /= f->num_v_slices;

  1460.             fs->slice_width  = fs->slice_width /f->num_h_slices - fs->slice_x;

  1461.             fs->slice_height = fs->slice_height/f->num_v_slices - fs->slice_y;

  1462.             if((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height)

  1463.                 return -1;

  1464.             if(    (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width

  1465.                 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

  1466.                 return -1;

  1467.         }

  1468. 

  1469.         for(i=0; i<f->plane_count; i++){

  1470.             PlaneContext * const p= &fs->plane[i];

  1471. 

  1472.             if(f->version >= 2){

  1473.                 int idx=get_symbol(c, state, 0);

  1474.                 if(idx > (unsigned)f->quant_table_count){

  1475.                     av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");

  1476.                     return -1;

  1477.                 }

  1478.                 p->quant_table_index= idx;

  1479.                 memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));

  1480.                 context_count= f->context_count[idx];

  1481.             }else{

  1482.                 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));

  1483.             }

  1484. 

  1485.             if(p->context_count < context_count){

  1486.                 av_freep(&p->state);

  1487.                 av_freep(&p->vlc_state);

  1488.             }

  1489.             p->context_count= context_count;

  1490.         }

  1491.     }

  1492. 

  1493.     return 0;

  1494. }

  1495. 

  1496. static av_cold int decode_init(AVCodecContext *avctx)

  1497. {

  1498.     FFV1Context *f = avctx->priv_data;

  1499. 

  1500.     common_init(avctx);

  1501. 

  1502.     if(avctx->extradata && read_extra_header(f) < 0)

  1503.         return -1;

  1504. 

  1505.     if(init_slice_contexts(f) < 0)

  1506.         return -1;

  1507. 

  1508.     return 0;

  1509. }

  1510. 

  1511. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  1512.     const uint8_t *buf = avpkt->data;

  1513.     int buf_size = avpkt->size;

  1514.     FFV1Context *f = avctx->priv_data;

  1515.     RangeCoder * const c= &f->slice_context[0]->c;

  1516.     AVFrame * const p= &f->picture;

  1517.     int bytes_read, i;

  1518.     uint8_t keystate= 128;

  1519.     const uint8_t *buf_p;

  1520. 

  1521.     AVFrame *picture = data;

  1522. 

  1523.     ff_init_range_decoder(c, buf, buf_size);

  1524.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1525. 

  1526. 

  1527.     p->pict_type= FF_I_TYPE; //FIXME I vs. P

  1528.     if(get_rac(c, &keystate)){

  1529.         p->key_frame= 1;

  1530.         if(read_header(f) < 0)

  1531.             return -1;

  1532.         if(init_slice_state(f) < 0)

  1533.             return -1;

  1534. 

  1535.         clear_state(f);

  1536.     }else{

  1537.         p->key_frame= 0;

  1538.     }

  1539.     if(f->ac>1){

  1540.         int i;

  1541.         for(i=1; i<256; i++){

  1542.             c->one_state[i]= f->state_transition[i];

  1543.             c->zero_state[256-i]= 256-c->one_state[i];

  1544.         }

  1545.     }

  1546. 

  1547.     p->reference= 0;

  1548.     if(avctx->get_buffer(avctx, p) < 0){

  1549.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1550.         return -1;

  1551.     }

  1552. 

  1553.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  1554.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  1555. 

  1556.     if(!f->ac){

  1557.         bytes_read = c->bytestream - c->bytestream_start - 1;

  1558.         if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME

  1559. //printf("pos=%d\n", bytes_read);

  1560.         init_get_bits(&f->slice_context[0]->gb, buf + bytes_read, buf_size - bytes_read);

  1561.     } else {

  1562.         bytes_read = 0; /* avoid warning */

  1563.     }

  1564. 

  1565.     buf_p= buf + buf_size;

  1566.     for(i=f->slice_count-1; i>0; i--){

  1567.         FFV1Context *fs= f->slice_context[i];

  1568.         int v= AV_RB24(buf_p-3)+3;

  1569.         if(buf_p - buf <= v){

  1570.             av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");

  1571.             return -1;

  1572.         }

  1573.         buf_p -= v;

  1574.         if(fs->ac){

  1575.             ff_init_range_decoder(&fs->c, buf_p, v);

  1576.         }else{

  1577.             init_get_bits(&fs->gb, buf_p, v);

  1578.         }

  1579.     }

  1580. 

  1581.     avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1582.     f->picture_number++;

  1583. 

  1584.     *picture= *p;

  1585. 

  1586.     avctx->release_buffer(avctx, p); //FIXME

  1587. 

  1588.     *data_size = sizeof(AVFrame);

  1589. 

  1590.     return buf_size;

  1591. }

  1592. 

  1593. AVCodec ffv1_decoder = {

  1594.     "ffv1",

  1595.     AVMEDIA_TYPE_VIDEO,

  1596.     CODEC_ID_FFV1,

  1597.     sizeof(FFV1Context),

  1598.     decode_init,

  1599.     NULL,

  1600.     common_end,

  1601.     decode_frame,

  1602.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1603.     NULL,

  1604.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1605. };

  1606. 

  1607. #if CONFIG_FFV1_ENCODER

  1608. AVCodec ffv1_encoder = {

  1609.     "ffv1",

  1610.     AVMEDIA_TYPE_VIDEO,

  1611.     CODEC_ID_FFV1,

  1612.     sizeof(FFV1Context),

  1613.     encode_init,

  1614.     encode_frame,

  1615.     common_end,

  1616.     .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},

  1617.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1618. };

  1619. #endif