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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 context_count;

  222.     uint8_t (*state)[CONTEXT_SIZE];

  223.     VlcState *vlc_state;

  224.     uint8_t interlace_bit_state[2];

  225. } PlaneContext;

  226. 

  227. #define MAX_SLICES 256

  228. 

  229. typedef struct FFV1Context{

  230.     AVCodecContext *avctx;

  231.     RangeCoder c;

  232.     GetBitContext gb;

  233.     PutBitContext pb;

  234.     uint64_t rc_stat[256][2];

  235.     int version;

  236.     int width, height;

  237.     int chroma_h_shift, chroma_v_shift;

  238.     int flags;

  239.     int picture_number;

  240.     AVFrame picture;

  241.     int plane_count;

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

  243.     PlaneContext plane[MAX_PLANES];

  244.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

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

  246.     int context_count[MAX_QUANT_TABLES];

  247.     uint8_t state_transition[256];

  248.     int run_index;

  249.     int colorspace;

  250.     int_fast16_t *sample_buffer;

  251. 

  252.     int quant_table_count;

  253. 

  254.     DSPContext dsp;

  255. 

  256.     struct FFV1Context *slice_context[MAX_SLICES];

  257.     int slice_count;

  258.     int num_v_slices;

  259.     int num_h_slices;

  260.     int slice_width;

  261.     int slice_height;

  262.     int slice_x;

  263.     int slice_y;

  264. }FFV1Context;

  265. 

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

  267.     if(bits==8)

  268.         diff= (int8_t)diff;

  269.     else{

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

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

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

  273.     }

  274. 

  275.     return diff;

  276. }

  277. 

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

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

  280.     const int  T= last[ 0];

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

  282. 

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

  284. }

  285. 

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

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

  288.     const int  T= last[ 0];

  289.     const int RT= last[ 1];

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

  291. 

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

  293.         const int TT= last2[0];

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

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

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

  297.     }else

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

  299. }

  300. 

  301. static inline void put_symbol_inline(RangeCoder *c, uint8_t *state, int v, int is_signed, uint64_t rc_stat[256][2]){

  302.     int i;

  303. 

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

  305. do{\

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

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

  308. }while(0)

  309. 

  310.     if(v){

  311.         const int a= FFABS(v);

  312.         const int e= av_log2(a);

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

  314.         if(e<=9){

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

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

  317.             }

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

  319. 

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

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

  322.             }

  323. 

  324.             if(is_signed)

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

  326.         }else{

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

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

  329.             }

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

  331. 

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

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

  334.             }

  335. 

  336.             if(is_signed)

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

  338.         }

  339.     }else{

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

  341.     }

  342. #undef put_rac

  343. }

  344. 

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

  346.     uint64_t rc_stat[256][2]; //we dont bother counting header bits.

  347.     put_symbol_inline(c, state, v, is_signed, rc_stat);

  348. }

  349. 

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

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

  352.         return 0;

  353.     else{

  354.         int i, e, a;

  355.         e= 0;

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

  357.             e++;

  358.         }

  359. 

  360.         a= 1;

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

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

  363.         }

  364. 

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

  366.         return (a^e)-e;

  367.     }

  368. }

  369. 

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

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

  372. }

  373. 

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

  375.     int drift= state->drift;

  376.     int count= state->count;

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

  378.     drift += v;

  379. 

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

  381.         count >>= 1;

  382.         drift >>= 1;

  383.         state->error_sum >>= 1;

  384.     }

  385.     count++;

  386. 

  387.     if(drift <= -count){

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

  389. 

  390.         drift += count;

  391.         if(drift <= -count)

  392.             drift= -count + 1;

  393.     }else if(drift > 0){

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

  395. 

  396.         drift -= count;

  397.         if(drift > 0)

  398.             drift= 0;

  399.     }

  400. 

  401.     state->drift= drift;

  402.     state->count= count;

  403. }

  404. 

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

  406.     int i, k, code;

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

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

  409. 

  410.     i= state->count;

  411.     k=0;

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

  413.         k++;

  414.         i += i;

  415.     }

  416. 

  417.     assert(k<=8);

  418. 

  419. #if 0 // JPEG LS

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

  421.     else                                         code= v;

  422. #else

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

  424. #endif

  425. 

  426. //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);

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

  428. 

  429.     update_vlc_state(state, v);

  430. }

  431. 

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

  433.     int k, i, v, ret;

  434. 

  435.     i= state->count;

  436.     k=0;

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

  438.         k++;

  439.         i += i;

  440.     }

  441. 

  442.     assert(k<=8);

  443. 

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

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

  446. 

  447. #if 0 // JPEG LS

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

  449. #else

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

  451. #endif

  452. 

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

  454. 

  455.     update_vlc_state(state, v);

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

  457.     return ret;

  458. }

  459. 

  460. #if CONFIG_FFV1_ENCODER

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

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

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

  464.     int x;

  465.     int run_index= s->run_index;

  466.     int run_count=0;

  467.     int run_mode=0;

  468. 

  469.     if(s->ac){

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

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

  472.             return -1;

  473.         }

  474.     }else{

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

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

  477.             return -1;

  478.         }

  479.     }

  480. 

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

  482.         int diff, context;

  483. 

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

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

  486. 

  487.         if(context < 0){

  488.             context = -context;

  489.             diff= -diff;

  490.         }

  491. 

  492.         diff= fold(diff, bits);

  493. 

  494.         if(s->ac){

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

  496.         }else{

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

  498. 

  499.             if(run_mode){

  500. 

  501.                 if(diff){

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

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

  504.                         run_index++;

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

  506.                     }

  507. 

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

  509.                     if(run_index) run_index--;

  510.                     run_count=0;

  511.                     run_mode=0;

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

  513.                 }else{

  514.                     run_count++;

  515.                 }

  516.             }

  517. 

  518. //            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));

  519. 

  520.             if(run_mode == 0)

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

  522.         }

  523.     }

  524.     if(run_mode){

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

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

  527.             run_index++;

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

  529.         }

  530. 

  531.         if(run_count)

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

  533.     }

  534.     s->run_index= run_index;

  535. 

  536.     return 0;

  537. }

  538. 

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

  540.     int x,y,i;

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

  542.     int_fast16_t *sample[3];

  543.     s->run_index=0;

  544. 

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

  546. 

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

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

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

  550. 

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

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

  553. //{START_TIMER

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

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

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

  557.             }

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

  559.         }else{

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

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

  562.             }

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

  564.         }

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

  566.     }

  567. }

  568. 

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

  570.     int x, y, p, i;

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

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

  573.     s->run_index=0;

  574. 

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

  576. 

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

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

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

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

  581. 

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

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

  584.             int b= v&0xFF;

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

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

  587. 

  588.             b -= g;

  589.             r -= g;

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

  591.             b += 0x100;

  592.             r += 0x100;

  593. 

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

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

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

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

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

  599.         }

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

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

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

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

  604.         }

  605.     }

  606. }

  607. 

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

  609.     int last=0;

  610.     int i;

  611.     uint8_t state[CONTEXT_SIZE];

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

  613. 

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

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

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

  617.             last= i;

  618.         }

  619.     }

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

  621. }

  622. 

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

  624.     int i;

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

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

  627. }

  628. 

  629. static void write_header(FFV1Context *f){

  630.     uint8_t state[CONTEXT_SIZE];

  631.     int i, j;

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

  633. 

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

  635. 

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

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

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

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

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

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

  642.             }

  643.         }

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

  645.         if(f->version>0)

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

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

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

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

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

  651. 

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

  653.     }else{

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

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

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

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

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

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

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

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

  662.             put_symbol(c, state, f->avctx->context_model, 0);

  663.         }

  664.     }

  665. }

  666. #endif /* CONFIG_FFV1_ENCODER */

  667. 

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

  669.     FFV1Context *s = avctx->priv_data;

  670. 

  671.     s->avctx= avctx;

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

  673. 

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

  675. 

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

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

  678. 

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

  680.     //defaults

  681.     s->num_h_slices=1;

  682.     s->num_v_slices=1;

  683. 

  684. 

  685.     return 0;

  686. }

  687. 

  688. static int init_slice_state(FFV1Context *f){

  689.     int i, j;

  690. 

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

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

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

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

  695. 

  696.             if(fs->ac){

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

  698.                 if(!p->    state)

  699.                     return AVERROR(ENOMEM);

  700.             }else{

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

  702.                 if(!p->vlc_state)

  703.                     return AVERROR(ENOMEM);

  704.             }

  705.         }

  706. 

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

  708.             //FIXME only redo if state_transition changed

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

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

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

  712.             }

  713.         }

  714.     }

  715. 

  716.     return 0;

  717. }

  718. 

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

  720.     int i;

  721. 

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

  723. 

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

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

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

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

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

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

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

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

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

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

  734. 

  735.         fs->slice_width = sxe - sxs;

  736.         fs->slice_height= sye - sys;

  737.         fs->slice_x     = sxs;

  738.         fs->slice_y     = sys;

  739. 

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

  741.         if (!fs->sample_buffer)

  742.             return AVERROR(ENOMEM);

  743.     }

  744.     return 0;

  745. }

  746. 

  747. #if CONFIG_FFV1_ENCODER

  748. static int write_extra_header(FFV1Context *f){

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

  750.     uint8_t state[CONTEXT_SIZE];

  751.     int i;

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

  753. 

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

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

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

  757. 

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

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

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

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

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

  763.         }

  764.     }

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

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

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

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

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

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

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

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

  773. 

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

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

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

  777. 

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

  779. 

  780.     return 0;

  781. }

  782. 

  783. static av_cold int encode_init(AVCodecContext *avctx)

  784. {

  785.     FFV1Context *s = avctx->priv_data;

  786.     int i, j, i2;

  787. 

  788.     common_init(avctx);

  789. 

  790.     s->version=0;

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

  792. 

  793.     if(s->ac>1)

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

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

  796. 

  797.     s->plane_count=2;

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

  799.         s->quant_table_count=2;

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

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

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

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

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

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

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

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

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

  809.         }else{

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

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

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

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

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

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

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

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

  818.         }

  819.     }

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

  821. 

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

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

  824. 

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

  826.         if(avctx->context_model==0){

  827.             p->context_count= (11*11*11+1)/2;

  828.         }else{

  829.             p->context_count= (11*11*5*5*5+1)/2;

  830.         }

  831.     }

  832. 

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

  834.     switch(avctx->pix_fmt){

  835.     case PIX_FMT_YUV444P16:

  836.     case PIX_FMT_YUV422P16:

  837.     case PIX_FMT_YUV420P16:

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

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

  840.             return -1;

  841.         }

  842.         if(!s->ac){

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

  844.             return -1;

  845.         }

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

  847.     case PIX_FMT_YUV444P:

  848.     case PIX_FMT_YUV422P:

  849.     case PIX_FMT_YUV420P:

  850.     case PIX_FMT_YUV411P:

  851.     case PIX_FMT_YUV410P:

  852.         s->colorspace= 0;

  853.         break;

  854.     case PIX_FMT_RGB32:

  855.         s->colorspace= 1;

  856.         break;

  857.     default:

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

  859.         return -1;

  860.     }

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

  862. 

  863.     s->picture_number=0;

  864. 

  865.     if(avctx->stats_in){

  866.         char *p= avctx->stats_in;

  867.         int changed;

  868. 

  869.         for(;;){

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

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

  872.                     char *next;

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

  874.                     if(next==p){

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

  876.                         return -1;

  877.                     }

  878.                     p=next;

  879.                 }

  880.             }

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

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

  883.         }

  884. 

  885.         do{

  886.             changed=0;

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

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

  889. #define COST(old, new) \

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

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

  892. 

  893. #define COST2(old, new) \

  894.     COST(old, new)\

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

  896. 

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

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

  899.                     if(sizeX < size0 && i!=128 && i2!=128){ //128 is special we cant swap it around FIXME 127<->129 swap

  900.                         int j;

  901.                         FFSWAP(int, s->state_transition[    i], s->state_transition[    i2]);

  902.                         FFSWAP(int, s->state_transition[256-i], s->state_transition[256-i2]);

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

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

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

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

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

  908.                             if     (s->state_transition[j] == i ) s->state_transition[j] = i2;

  909.                             else if(s->state_transition[j] == i2) s->state_transition[j] = i ;

  910.                             if     (s->state_transition[256-j] == 256-i ) s->state_transition[256-j] = 256-i2;

  911.                             else if(s->state_transition[256-j] == 256-i2) s->state_transition[256-j] = 256-i ;

  912.                         }

  913.                         changed=1;

  914.                     }

  915.                 }

  916.             }

  917.         }while(changed);

  918.     }

  919. 

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

  921.         s->num_h_slices=2;

  922.         s->num_v_slices=2;

  923.         write_extra_header(s);

  924.     }

  925. 

  926.     if(init_slice_contexts(s) < 0)

  927.         return -1;

  928.     if(init_slice_state(s) < 0)

  929.         return -1;

  930. 

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

  932. 

  933.     return 0;

  934. }

  935. #endif /* CONFIG_FFV1_ENCODER */

  936. 

  937. 

  938. static void clear_state(FFV1Context *f){

  939.     int i, si, j;

  940. 

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

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

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

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

  945. 

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

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

  948. 

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

  950.                 if(fs->ac){

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

  952.                 }else{

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

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

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

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

  957.                 }

  958.             }

  959.         }

  960.     }

  961. }

  962. 

  963. #if CONFIG_FFV1_ENCODER

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

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

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

  967.     int width = fs->slice_width;

  968.     int height= fs->slice_height;

  969.     int x= fs->slice_x;

  970.     int y= fs->slice_y;

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

  972. 

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

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

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

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

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

  978. 

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

  980. 

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

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

  983.     }else{

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

  985.     }

  986.     emms_c();

  987. 

  988.     return 0;

  989. }

  990. 

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

  992.     FFV1Context *f = avctx->priv_data;

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

  994.     AVFrame *pict = data;

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

  996.     int used_count= 0;

  997.     uint8_t keystate=128;

  998.     uint8_t *buf_p;

  999.     int i;

  1000. 

  1001.     ff_init_range_encoder(c, buf, buf_size);

  1002.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1003. 

  1004.     *p = *pict;

  1005.     p->pict_type= FF_I_TYPE;

  1006. 

  1007.     if(avctx->gop_size==0 || f->picture_number % avctx->gop_size == 0){

  1008.         put_rac(c, &keystate, 1);

  1009.         p->key_frame= 1;

  1010.         write_header(f);

  1011.         clear_state(f);

  1012.     }else{

  1013.         put_rac(c, &keystate, 0);

  1014.         p->key_frame= 0;

  1015.     }

  1016. 

  1017.     if(!f->ac){

  1018.         used_count += ff_rac_terminate(c);

  1019. //printf("pos=%d\n", used_count);

  1020.         init_put_bits(&f->slice_context[0]->pb, buf + used_count, buf_size - used_count);

  1021.     }else if (f->ac>1){

  1022.         int i;

  1023.         for(i=1; i<256; i++){

  1024.             c->one_state[i]= f->state_transition[i];

  1025.             c->zero_state[256-i]= 256-c->one_state[i];

  1026.         }

  1027.     }

  1028. 

  1029.     for(i=1; i<f->slice_count; i++){

  1030.         FFV1Context *fs= f->slice_context[i];

  1031.         uint8_t *start= buf + (buf_size-used_count)*i/f->slice_count;

  1032.         int len= buf_size/f->slice_count;

  1033. 

  1034.         if(fs->ac){

  1035.             ff_init_range_encoder(&fs->c, start, len);

  1036.         }else{

  1037.             init_put_bits(&fs->pb, start, len);

  1038.         }

  1039.     }

  1040.     avctx->execute(avctx, encode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1041. 

  1042.     buf_p=buf;

  1043.     for(i=0; i<f->slice_count; i++){

  1044.         FFV1Context *fs= f->slice_context[i];

  1045.         int bytes;

  1046. 

  1047.         if(fs->ac){

  1048.             uint8_t state=128;

  1049.             put_rac(&fs->c, &state, 0);

  1050.             bytes= ff_rac_terminate(&fs->c);

  1051.         }else{

  1052.             flush_put_bits(&fs->pb); //nicer padding FIXME

  1053.             bytes= used_count + (put_bits_count(&fs->pb)+7)/8;

  1054.             used_count= 0;

  1055.         }

  1056.         if(i>0){

  1057.             av_assert0(bytes < buf_size/f->slice_count);

  1058.             memmove(buf_p, fs->ac ? fs->c.bytestream_start : fs->pb.buf, bytes);

  1059.             av_assert0(bytes < (1<<24));

  1060.             AV_WB24(buf_p+bytes, bytes);

  1061.             bytes+=3;

  1062.         }

  1063.         buf_p += bytes;

  1064.     }

  1065. 

  1066.     if((avctx->flags&CODEC_FLAG_PASS1) && (f->picture_number&31)==0){

  1067.         int j;

  1068.         char *p= avctx->stats_out;

  1069.         char *end= p + 1024*30;

  1070. 

  1071.         memset(f->rc_stat, 0, sizeof(f->rc_stat));

  1072.         for(j=0; j<f->slice_count; j++){

  1073.             FFV1Context *fs= f->slice_context[j];

  1074.             for(i=0; i<256; i++){

  1075.                 f->rc_stat[i][0] += fs->rc_stat[i][0];

  1076.                 f->rc_stat[i][1] += fs->rc_stat[i][1];

  1077.             }

  1078.         }

  1079. 

  1080.         for(j=0; j<256; j++){

  1081.             snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat[j][0], f->rc_stat[j][1]);

  1082.             p+= strlen(p);

  1083.         }

  1084.         snprintf(p, end-p, "\n");

  1085.     } else

  1086.         avctx->stats_out[0] = '\0';

  1087. 

  1088.     f->picture_number++;

  1089.     return buf_p-buf;

  1090. }

  1091. #endif /* CONFIG_FFV1_ENCODER */

  1092. 

  1093. static av_cold int common_end(AVCodecContext *avctx){

  1094.     FFV1Context *s = avctx->priv_data;

  1095.     int i, j;

  1096. 

  1097.     for(j=0; j<s->slice_count; j++){

  1098.         FFV1Context *fs= s->slice_context[j];

  1099.         for(i=0; i<s->plane_count; i++){

  1100.             PlaneContext *p= &fs->plane[i];

  1101. 

  1102.             av_freep(&p->state);

  1103.             av_freep(&p->vlc_state);

  1104.         }

  1105.         av_freep(&fs->sample_buffer);

  1106.     }

  1107. 

  1108.     av_freep(&avctx->stats_out);

  1109. 

  1110.     return 0;

  1111. }

  1112. 

  1113. static av_always_inline void decode_line(FFV1Context *s, int w, int_fast16_t *sample[2], int plane_index, int bits){

  1114.     PlaneContext * const p= &s->plane[plane_index];

  1115.     RangeCoder * const c= &s->c;

  1116.     int x;

  1117.     int run_count=0;

  1118.     int run_mode=0;

  1119.     int run_index= s->run_index;

  1120. 

  1121.     for(x=0; x<w; x++){

  1122.         int diff, context, sign;

  1123. 

  1124.         context= get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);

  1125.         if(context < 0){

  1126.             context= -context;

  1127.             sign=1;

  1128.         }else

  1129.             sign=0;

  1130. 

  1131.         av_assert2(context < p->context_count);

  1132. 

  1133.         if(s->ac){

  1134.             diff= get_symbol_inline(c, p->state[context], 1);

  1135.         }else{

  1136.             if(context == 0 && run_mode==0) run_mode=1;

  1137. 

  1138.             if(run_mode){

  1139.                 if(run_count==0 && run_mode==1){

  1140.                     if(get_bits1(&s->gb)){

  1141.                         run_count = 1<<ff_log2_run[run_index];

  1142.                         if(x + run_count <= w) run_index++;

  1143.                     }else{

  1144.                         if(ff_log2_run[run_index]) run_count = get_bits(&s->gb, ff_log2_run[run_index]);

  1145.                         else run_count=0;

  1146.                         if(run_index) run_index--;

  1147.                         run_mode=2;

  1148.                     }

  1149.                 }

  1150.                 run_count--;

  1151.                 if(run_count < 0){

  1152.                     run_mode=0;

  1153.                     run_count=0;

  1154.                     diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1155.                     if(diff>=0) diff++;

  1156.                 }else

  1157.                     diff=0;

  1158.             }else

  1159.                 diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1160. 

  1161. //            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));

  1162.         }

  1163. 

  1164.         if(sign) diff= -diff;

  1165. 

  1166.         sample[1][x]= (predict(sample[1] + x, sample[0] + x) + diff) & ((1<<bits)-1);

  1167.     }

  1168.     s->run_index= run_index;

  1169. }

  1170. 

  1171. static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){

  1172.     int x, y;

  1173.     int_fast16_t *sample[2];

  1174.     sample[0]=s->sample_buffer    +3;

  1175.     sample[1]=s->sample_buffer+w+6+3;

  1176. 

  1177.     s->run_index=0;

  1178. 

  1179.     memset(s->sample_buffer, 0, 2*(w+6)*sizeof(*s->sample_buffer));

  1180. 

  1181.     for(y=0; y<h; y++){

  1182.         int_fast16_t *temp= sample[0]; //FIXME try a normal buffer

  1183. 

  1184.         sample[0]= sample[1];

  1185.         sample[1]= temp;

  1186. 

  1187.         sample[1][-1]= sample[0][0  ];

  1188.         sample[0][ w]= sample[0][w-1];

  1189. 

  1190. //{START_TIMER

  1191.         if(s->avctx->bits_per_raw_sample <= 8){

  1192.             decode_line(s, w, sample, plane_index, 8);

  1193.             for(x=0; x<w; x++){

  1194.                 src[x + stride*y]= sample[1][x];

  1195.             }

  1196.         }else{

  1197.             decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

  1198.             for(x=0; x<w; x++){

  1199.                 ((uint16_t*)(src + stride*y))[x]= sample[1][x] << (16 - s->avctx->bits_per_raw_sample);

  1200.             }

  1201.         }

  1202. //STOP_TIMER("decode-line")}

  1203.     }

  1204. }

  1205. 

  1206. static void decode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){

  1207.     int x, y, p;

  1208.     int_fast16_t *sample[3][2];

  1209.     for(x=0; x<3; x++){

  1210.         sample[x][0] = s->sample_buffer +  x*2   *(w+6) + 3;

  1211.         sample[x][1] = s->sample_buffer + (x*2+1)*(w+6) + 3;

  1212.     }

  1213. 

  1214.     s->run_index=0;

  1215. 

  1216.     memset(s->sample_buffer, 0, 6*(w+6)*sizeof(*s->sample_buffer));

  1217. 

  1218.     for(y=0; y<h; y++){

  1219.         for(p=0; p<3; p++){

  1220.             int_fast16_t *temp= sample[p][0]; //FIXME try a normal buffer

  1221. 

  1222.             sample[p][0]= sample[p][1];

  1223.             sample[p][1]= temp;

  1224. 

  1225.             sample[p][1][-1]= sample[p][0][0  ];

  1226.             sample[p][0][ w]= sample[p][0][w-1];

  1227.             decode_line(s, w, sample[p], FFMIN(p, 1), 9);

  1228.         }

  1229.         for(x=0; x<w; x++){

  1230.             int g= sample[0][1][x];

  1231.             int b= sample[1][1][x];

  1232.             int r= sample[2][1][x];

  1233. 

  1234. //            assert(g>=0 && b>=0 && r>=0);

  1235. //            assert(g<256 && b<512 && r<512);

  1236. 

  1237.             b -= 0x100;

  1238.             r -= 0x100;

  1239.             g -= (b + r)>>2;

  1240.             b += g;

  1241.             r += g;

  1242. 

  1243.             src[x + stride*y]= b + (g<<8) + (r<<16) + (0xFF<<24);

  1244.         }

  1245.     }

  1246. }

  1247. 

  1248. static int decode_slice(AVCodecContext *c, void *arg){

  1249.     FFV1Context *fs= *(void**)arg;

  1250.     FFV1Context *f= fs->avctx->priv_data;

  1251.     int width = fs->slice_width;

  1252.     int height= fs->slice_height;

  1253.     int x= fs->slice_x;

  1254.     int y= fs->slice_y;

  1255.     AVFrame * const p= &f->picture;

  1256. 

  1257.     av_assert1(width && height);

  1258.     if(f->colorspace==0){

  1259.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1260.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1261.         const int cx= x>>f->chroma_h_shift;

  1262.         const int cy= y>>f->chroma_v_shift;

  1263.         decode_plane(fs, p->data[0] + x + y*p->linesize[0], width, height, p->linesize[0], 0);

  1264. 

  1265.         decode_plane(fs, p->data[1] + cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  1266.         decode_plane(fs, p->data[2] + cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[2], 1);

  1267.     }else{

  1268.         decode_rgb_frame(fs, (uint32_t*)p->data[0] + x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1269.     }

  1270. 

  1271.     emms_c();

  1272. 

  1273.     return 0;

  1274. }

  1275. 

  1276. static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale){

  1277.     int v;

  1278.     int i=0;

  1279.     uint8_t state[CONTEXT_SIZE];

  1280. 

  1281.     memset(state, 128, sizeof(state));

  1282. 

  1283.     for(v=0; i<128 ; v++){

  1284.         int len= get_symbol(c, state, 0) + 1;

  1285. 

  1286.         if(len + i > 128) return -1;

  1287. 

  1288.         while(len--){

  1289.             quant_table[i] = scale*v;

  1290.             i++;

  1291. //printf("%2d ",v);

  1292. //if(i%16==0) printf("\n");

  1293.         }

  1294.     }

  1295. 

  1296.     for(i=1; i<128; i++){

  1297.         quant_table[256-i]= -quant_table[i];

  1298.     }

  1299.     quant_table[128]= -quant_table[127];

  1300. 

  1301.     return 2*v - 1;

  1302. }

  1303. 

  1304. static int read_quant_tables(RangeCoder *c, int16_t quant_table[MAX_CONTEXT_INPUTS][256]){

  1305.     int i;

  1306.     int context_count=1;

  1307. 

  1308.     for(i=0; i<5; i++){

  1309.         context_count*= read_quant_table(c, quant_table[i], context_count);

  1310.         if(context_count > 32768U){

  1311.             return -1;

  1312.         }

  1313.     }

  1314.     return (context_count+1)/2;

  1315. }

  1316. 

  1317. static int read_extra_header(FFV1Context *f){

  1318.     RangeCoder * const c= &f->c;

  1319.     uint8_t state[CONTEXT_SIZE];

  1320.     int i;

  1321. 

  1322.     memset(state, 128, sizeof(state));

  1323. 

  1324.     ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);

  1325.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1326. 

  1327.     f->version= get_symbol(c, state, 0);

  1328.     f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1329.     if(f->ac>1){

  1330.         for(i=1; i<256; i++){

  1331.             f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1332.         }

  1333.     }

  1334.     f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1335.     f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1336.     get_rac(c, state); //no chroma = false

  1337.     f->chroma_h_shift= get_symbol(c, state, 0);

  1338.     f->chroma_v_shift= get_symbol(c, state, 0);

  1339.     get_rac(c, state); //transparency plane

  1340.     f->plane_count= 2;

  1341.     f->num_h_slices= 1 + get_symbol(c, state, 0);

  1342.     f->num_v_slices= 1 + get_symbol(c, state, 0);

  1343.     if(f->num_h_slices > (unsigned)f->width || f->num_v_slices > (unsigned)f->height){

  1344.         av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");

  1345.         return -1;

  1346.     }

  1347. 

  1348.     f->quant_table_count= get_symbol(c, state, 0);

  1349.     if(f->quant_table_count > (unsigned)MAX_QUANT_TABLES)

  1350.         return -1;

  1351.     for(i=0; i<f->quant_table_count; i++){

  1352.         if((f->context_count[i]= read_quant_tables(c, f->quant_tables[i])) < 0){

  1353.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1354.             return -1;

  1355.         }

  1356.     }

  1357. 

  1358.     return 0;

  1359. }

  1360. 

  1361. static int read_header(FFV1Context *f){

  1362.     uint8_t state[CONTEXT_SIZE];

  1363.     int i, j, context_count;

  1364.     RangeCoder * const c= &f->slice_context[0]->c;

  1365. 

  1366.     memset(state, 128, sizeof(state));

  1367. 

  1368.     if(f->version < 2){

  1369.         f->version= get_symbol(c, state, 0);

  1370.         f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1371.         if(f->ac>1){

  1372.             for(i=1; i<256; i++){

  1373.                 f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1374.             }

  1375.         }

  1376.         f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1377.         if(f->version>0)

  1378.             f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1379.         get_rac(c, state); //no chroma = false

  1380.         f->chroma_h_shift= get_symbol(c, state, 0);

  1381.         f->chroma_v_shift= get_symbol(c, state, 0);

  1382.         get_rac(c, state); //transparency plane

  1383.         f->plane_count= 2;

  1384.     }

  1385. 

  1386.     if(f->colorspace==0){

  1387.         if(f->avctx->bits_per_raw_sample<=8){

  1388.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1389.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;

  1390.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;

  1391.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;

  1392.             case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;

  1393.             case 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  1394.             default:

  1395.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1396.                 return -1;

  1397.             }

  1398.         }else{

  1399.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1400.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1401.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  1402.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P16; break;

  1403.             default:

  1404.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1405.                 return -1;

  1406.             }

  1407.         }

  1408.     }else if(f->colorspace==1){

  1409.         if(f->chroma_h_shift || f->chroma_v_shift){

  1410.             av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");

  1411.             return -1;

  1412.         }

  1413.         f->avctx->pix_fmt= PIX_FMT_RGB32;

  1414.     }else{

  1415.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  1416.         return -1;

  1417.     }

  1418. 

  1419. //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

  1420.     if(f->version < 2){

  1421.         context_count= read_quant_tables(c, f->quant_table);

  1422.         if(context_count < 0){

  1423.                 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1424.                 return -1;

  1425.         }

  1426.     }else{

  1427.         f->slice_count= get_symbol(c, state, 0);

  1428.         if(f->slice_count > (unsigned)MAX_SLICES)

  1429.             return -1;

  1430.     }

  1431. 

  1432.     for(j=0; j<f->slice_count; j++){

  1433.         FFV1Context *fs= f->slice_context[j];

  1434.         fs->ac= f->ac;

  1435. 

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

  1437.             fs->slice_x     = get_symbol(c, state, 0)   *f->width ;

  1438.             fs->slice_y     = get_symbol(c, state, 0)   *f->height;

  1439.             fs->slice_width =(get_symbol(c, state, 0)+1)*f->width  + fs->slice_x;

  1440.             fs->slice_height=(get_symbol(c, state, 0)+1)*f->height + fs->slice_y;

  1441. 

  1442.             fs->slice_x /= f->num_h_slices;

  1443.             fs->slice_y /= f->num_v_slices;

  1444.             fs->slice_width  = fs->slice_width /f->num_h_slices - fs->slice_x;

  1445.             fs->slice_height = fs->slice_height/f->num_v_slices - fs->slice_y;

  1446.             if((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height)

  1447.                 return -1;

  1448.             if(    (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width

  1449.                 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

  1450.                 return -1;

  1451.         }

  1452. 

  1453.         for(i=0; i<f->plane_count; i++){

  1454.             PlaneContext * const p= &fs->plane[i];

  1455. 

  1456.             if(f->version >= 2){

  1457.                 int idx=get_symbol(c, state, 0);

  1458.                 if(idx > (unsigned)f->quant_table_count){

  1459.                     av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");

  1460.                     return -1;

  1461.                 }

  1462.                 memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));

  1463.                 context_count= f->context_count[idx];

  1464.             }else{

  1465.                 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));

  1466.             }

  1467. 

  1468.             if(p->context_count < context_count){

  1469.                 av_freep(&p->state);

  1470.                 av_freep(&p->vlc_state);

  1471.             }

  1472.             p->context_count= context_count;

  1473.         }

  1474.     }

  1475. 

  1476.     return 0;

  1477. }

  1478. 

  1479. static av_cold int decode_init(AVCodecContext *avctx)

  1480. {

  1481.     FFV1Context *f = avctx->priv_data;

  1482. 

  1483.     common_init(avctx);

  1484. 

  1485.     if(avctx->extradata && read_extra_header(f) < 0)

  1486.         return -1;

  1487. 

  1488.     if(init_slice_contexts(f) < 0)

  1489.         return -1;

  1490. 

  1491.     return 0;

  1492. }

  1493. 

  1494. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  1495.     const uint8_t *buf = avpkt->data;

  1496.     int buf_size = avpkt->size;

  1497.     FFV1Context *f = avctx->priv_data;

  1498.     RangeCoder * const c= &f->slice_context[0]->c;

  1499.     AVFrame * const p= &f->picture;

  1500.     int bytes_read, i;

  1501.     uint8_t keystate= 128;

  1502.     const uint8_t *buf_p;

  1503. 

  1504.     AVFrame *picture = data;

  1505. 

  1506.     ff_init_range_decoder(c, buf, buf_size);

  1507.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1508. 

  1509. 

  1510.     p->pict_type= FF_I_TYPE; //FIXME I vs. P

  1511.     if(get_rac(c, &keystate)){

  1512.         p->key_frame= 1;

  1513.         if(read_header(f) < 0)

  1514.             return -1;

  1515.         if(init_slice_state(f) < 0)

  1516.             return -1;

  1517. 

  1518.         clear_state(f);

  1519.     }else{

  1520.         p->key_frame= 0;

  1521.     }

  1522.     if(f->ac>1){

  1523.         int i;

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

  1525.             c->one_state[i]= f->state_transition[i];

  1526.             c->zero_state[256-i]= 256-c->one_state[i];

  1527.         }

  1528.     }

  1529. 

  1530.     p->reference= 0;

  1531.     if(avctx->get_buffer(avctx, p) < 0){

  1532.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1533.         return -1;

  1534.     }

  1535. 

  1536.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  1537.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  1538. 

  1539.     if(!f->ac){

  1540.         bytes_read = c->bytestream - c->bytestream_start - 1;

  1541.         if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME

  1542. //printf("pos=%d\n", bytes_read);

  1543.         init_get_bits(&f->slice_context[0]->gb, buf + bytes_read, buf_size - bytes_read);

  1544.     } else {

  1545.         bytes_read = 0; /* avoid warning */

  1546.     }

  1547. 

  1548.     buf_p= buf + buf_size;

  1549.     for(i=f->slice_count-1; i>0; i--){

  1550.         FFV1Context *fs= f->slice_context[i];

  1551.         int v= AV_RB24(buf_p-3)+3;

  1552.         if(buf_p - buf <= v){

  1553.             av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");

  1554.             return -1;

  1555.         }

  1556.         buf_p -= v;

  1557.         if(fs->ac){

  1558.             ff_init_range_decoder(&fs->c, buf_p, v);

  1559.         }else{

  1560.             init_get_bits(&fs->gb, buf_p, v);

  1561.         }

  1562.     }

  1563. 

  1564.     avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1565.     f->picture_number++;

  1566. 

  1567.     *picture= *p;

  1568. 

  1569.     avctx->release_buffer(avctx, p); //FIXME

  1570. 

  1571.     *data_size = sizeof(AVFrame);

  1572. 

  1573.     return buf_size;

  1574. }

  1575. 

  1576. AVCodec ffv1_decoder = {

  1577.     "ffv1",

  1578.     AVMEDIA_TYPE_VIDEO,

  1579.     CODEC_ID_FFV1,

  1580.     sizeof(FFV1Context),

  1581.     decode_init,

  1582.     NULL,

  1583.     common_end,

  1584.     decode_frame,

  1585.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1586.     NULL,

  1587.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1588. };

  1589. 

  1590. #if CONFIG_FFV1_ENCODER

  1591. AVCodec ffv1_encoder = {

  1592.     "ffv1",

  1593.     AVMEDIA_TYPE_VIDEO,

  1594.     CODEC_ID_FFV1,

  1595.     sizeof(FFV1Context),

  1596.     encode_init,

  1597.     encode_frame,

  1598.     common_end,

  1599.     .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},

  1600.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1601. };

  1602. #endif