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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. 

  36. #define MAX_PLANES 4

  37. #define CONTEXT_SIZE 32

  38. 

  39. extern const uint8_t ff_log2_run[32];

  40. 

  41. static const int8_t quant3[256]={

  42.  0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  43.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  44.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  45.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  46.  1, 1, 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, 0,

  58. };

  59. 

  60. static const int8_t quant5_10bit[256]={

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

  62.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  63.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  64.  1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  65.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  66.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  67.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  68.  2, 2, 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,-1,

  74. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  75. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  76. -1,-1,-1,-1,-1,-1,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,

  77. };

  78. 

  79. static const int8_t quant5[256]={

  80.  0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  81.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  82.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  83.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  84.  2, 2, 2, 2, 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,-1,-1,-1,

  96. };

  97. static const int8_t quant7[256]={

  98.  0, 1, 1, 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, 2, 2, 2,

  100.  2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,

  101.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  102.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  103.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

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

  112. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  113. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,

  114. };

  115. static const int8_t quant9[256]={

  116.  0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  117.  3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  118.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  119.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  120.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

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

  131. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-1,-1,

  132. };

  133. static const int8_t quant9_10bit[256]={

  134.  0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2,

  135.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3,

  136.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  137.  3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  138.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  139.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  140.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

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

  147. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  148. -3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  149. -2,-2,-2,-2,-1,-1,-1,-1,-1,-1,-1,-1,-0,-0,-0,-0,

  150. };

  151. 

  152. static const int8_t quant11[256]={

  153.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

  154.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  155.  4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  156.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  157.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  158.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

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

  167. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  168. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  169. };

  170. static const int8_t quant13[256]={

  171.  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  172.  4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  173.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  174.  5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  175.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  176.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  177.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  178.  6, 6, 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,-5,

  184. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  185. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  186. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,

  187. };

  188. 

  189. static const uint8_t ver2_state[256]= {

  190.    0,  10,  10,  10,  10,  16,  16,  16,  28,  16,  16,  29,  42,  49,  20,  49,

  191.   59,  25,  26,  26,  27,  31,  33,  33,  33,  34,  34,  37,  67,  38,  39,  39,

  192.   40,  40,  41,  79,  43,  44,  45,  45,  48,  48,  64,  50,  51,  52,  88,  52,

  193.   53,  74,  55,  57,  58,  58,  74,  60, 101,  61,  62,  84,  66,  66,  68,  69,

  194.   87,  82,  71,  97,  73,  73,  82,  75, 111,  77,  94,  78,  87,  81,  83,  97,

  195.   85,  83,  94,  86,  99,  89,  90,  99, 111,  92,  93, 134,  95,  98, 105,  98,

  196.  105, 110, 102, 108, 102, 118, 103, 106, 106, 113, 109, 112, 114, 112, 116, 125,

  197.  115, 116, 117, 117, 126, 119, 125, 121, 121, 123, 145, 124, 126, 131, 127, 129,

  198.  165, 130, 132, 138, 133, 135, 145, 136, 137, 139, 146, 141, 143, 142, 144, 148,

  199.  147, 155, 151, 149, 151, 150, 152, 157, 153, 154, 156, 168, 158, 162, 161, 160,

  200.  172, 163, 169, 164, 166, 184, 167, 170, 177, 174, 171, 173, 182, 176, 180, 178,

  201.  175, 189, 179, 181, 186, 183, 192, 185, 200, 187, 191, 188, 190, 197, 193, 196,

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

  203.  209, 211, 221, 212, 213, 215, 224, 216, 217, 218, 219, 220, 222, 228, 223, 225,

  204.  226, 224, 227, 229, 240, 230, 231, 232, 233, 234, 235, 236, 238, 239, 237, 242,

  205.  241, 243, 242, 244, 245, 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 255,

  206. };

  207. 

  208. typedef struct VlcState{

  209.     int16_t drift;

  210.     uint16_t error_sum;

  211.     int8_t bias;

  212.     uint8_t count;

  213. } VlcState;

  214. 

  215. typedef struct PlaneContext{

  216.     int context_count;

  217.     uint8_t (*state)[CONTEXT_SIZE];

  218.     VlcState *vlc_state;

  219.     uint8_t interlace_bit_state[2];

  220. } PlaneContext;

  221. 

  222. typedef struct FFV1Context{

  223.     AVCodecContext *avctx;

  224.     RangeCoder c;

  225.     GetBitContext gb;

  226.     PutBitContext pb;

  227.     int version;

  228.     int width, height;

  229.     int chroma_h_shift, chroma_v_shift;

  230.     int flags;

  231.     int picture_number;

  232.     AVFrame picture;

  233.     int plane_count;

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

  235.     PlaneContext plane[MAX_PLANES];

  236.     int16_t quant_table[5][256];

  237.     uint8_t state_transition[256];

  238.     int run_index;

  239.     int colorspace;

  240. 

  241.     DSPContext dsp;

  242. }FFV1Context;

  243. 

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

  245.     if(bits==8)

  246.         diff= (int8_t)diff;

  247.     else{

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

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

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

  251.     }

  252. 

  253.     return diff;

  254. }

  255. 

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

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

  258.     const int  T= last[ 0];

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

  260. 

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

  262. }

  263. 

  264. static inline int get_context(FFV1Context *f, int_fast16_t *src, int_fast16_t *last, int_fast16_t *last2){

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

  266.     const int  T= last[ 0];

  267.     const int RT= last[ 1];

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

  269. 

  270.     if(f->quant_table[3][127]){

  271.         const int TT= last2[0];

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

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

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

  275.     }else

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

  277. }

  278. 

  279. static inline void put_symbol_inline(RangeCoder *c, uint8_t *state, int v, int is_signed){

  280.     int i;

  281. 

  282.     if(v){

  283.         const int a= FFABS(v);

  284.         const int e= av_log2(a);

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

  286.         if(e<=9){

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

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

  289.             }

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

  291. 

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

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

  294.             }

  295. 

  296.             if(is_signed)

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

  298.         }else{

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

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

  301.             }

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

  303. 

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

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

  306.             }

  307. 

  308.             if(is_signed)

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

  310.         }

  311.     }else{

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

  313.     }

  314. }

  315. 

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

  317.     put_symbol_inline(c, state, v, is_signed);

  318. }

  319. 

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

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

  322.         return 0;

  323.     else{

  324.         int i, e, a;

  325.         e= 0;

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

  327.             e++;

  328.         }

  329. 

  330.         a= 1;

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

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

  333.         }

  334. 

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

  336.         return (a^e)-e;

  337.     }

  338. }

  339. 

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

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

  342. }

  343. 

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

  345.     int drift= state->drift;

  346.     int count= state->count;

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

  348.     drift += v;

  349. 

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

  351.         count >>= 1;

  352.         drift >>= 1;

  353.         state->error_sum >>= 1;

  354.     }

  355.     count++;

  356. 

  357.     if(drift <= -count){

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

  359. 

  360.         drift += count;

  361.         if(drift <= -count)

  362.             drift= -count + 1;

  363.     }else if(drift > 0){

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

  365. 

  366.         drift -= count;

  367.         if(drift > 0)

  368.             drift= 0;

  369.     }

  370. 

  371.     state->drift= drift;

  372.     state->count= count;

  373. }

  374. 

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

  376.     int i, k, code;

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

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

  379. 

  380.     i= state->count;

  381.     k=0;

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

  383.         k++;

  384.         i += i;

  385.     }

  386. 

  387.     assert(k<=8);

  388. 

  389. #if 0 // JPEG LS

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

  391.     else                                         code= v;

  392. #else

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

  394. #endif

  395. 

  396. //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);

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

  398. 

  399.     update_vlc_state(state, v);

  400. }

  401. 

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

  403.     int k, i, v, ret;

  404. 

  405.     i= state->count;

  406.     k=0;

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

  408.         k++;

  409.         i += i;

  410.     }

  411. 

  412.     assert(k<=8);

  413. 

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

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

  416. 

  417. #if 0 // JPEG LS

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

  419. #else

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

  421. #endif

  422. 

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

  424. 

  425.     update_vlc_state(state, v);

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

  427.     return ret;

  428. }

  429. 

  430. #if CONFIG_FFV1_ENCODER

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

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

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

  434.     int x;

  435.     int run_index= s->run_index;

  436.     int run_count=0;

  437.     int run_mode=0;

  438. 

  439.     if(s->ac){

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

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

  442.             return -1;

  443.         }

  444.     }else{

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

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

  447.             return -1;

  448.         }

  449.     }

  450. 

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

  452.         int diff, context;

  453. 

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

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

  456. 

  457.         if(context < 0){

  458.             context = -context;

  459.             diff= -diff;

  460.         }

  461. 

  462.         diff= fold(diff, bits);

  463. 

  464.         if(s->ac){

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

  466.         }else{

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

  468. 

  469.             if(run_mode){

  470. 

  471.                 if(diff){

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

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

  474.                         run_index++;

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

  476.                     }

  477. 

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

  479.                     if(run_index) run_index--;

  480.                     run_count=0;

  481.                     run_mode=0;

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

  483.                 }else{

  484.                     run_count++;

  485.                 }

  486.             }

  487. 

  488. //            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));

  489. 

  490.             if(run_mode == 0)

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

  492.         }

  493.     }

  494.     if(run_mode){

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

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

  497.             run_index++;

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

  499.         }

  500. 

  501.         if(run_count)

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

  503.     }

  504.     s->run_index= run_index;

  505. 

  506.     return 0;

  507. }

  508. 

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

  510.     int x,y,i;

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

  512.     int_fast16_t sample_buffer[ring_size][w+6], *sample[ring_size];

  513.     s->run_index=0;

  514. 

  515.     memset(sample_buffer, 0, sizeof(sample_buffer));

  516. 

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

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

  519.             sample[i]= sample_buffer[(h+i-y)%ring_size]+3;

  520. 

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

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

  523. //{START_TIMER

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

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

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

  527.             }

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

  529.         }else{

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

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

  532.             }

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

  534.         }

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

  536.     }

  537. }

  538. 

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

  540.     int x, y, p, i;

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

  542.     int_fast16_t sample_buffer[3][ring_size][w+6], *sample[3][ring_size];

  543.     s->run_index=0;

  544. 

  545.     memset(sample_buffer, 0, sizeof(sample_buffer));

  546. 

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

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

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

  550.                 sample[p][i]= sample_buffer[p][(h+i-y)%ring_size]+3;

  551. 

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

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

  554.             int b= v&0xFF;

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

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

  557. 

  558.             b -= g;

  559.             r -= g;

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

  561.             b += 0x100;

  562.             r += 0x100;

  563. 

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

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

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

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

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

  569.         }

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

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

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

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

  574.         }

  575.     }

  576. }

  577. 

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

  579.     int last=0;

  580.     int i;

  581.     uint8_t state[CONTEXT_SIZE];

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

  583. 

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

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

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

  587.             last= i;

  588.         }

  589.     }

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

  591. }

  592. 

  593. static void write_header(FFV1Context *f){

  594.     uint8_t state[CONTEXT_SIZE];

  595.     int i;

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

  597. 

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

  599. 

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

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

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

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

  604.             f->state_transition[i]=ver2_state[i];

  605.             put_symbol(c, state, ver2_state[i] - c->one_state[i], 1);

  606.         }

  607.     }

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

  609.     if(f->version>0)

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

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

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

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

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

  615. 

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

  617.         write_quant_table(c, f->quant_table[i]);

  618. }

  619. #endif /* CONFIG_FFV1_ENCODER */

  620. 

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

  622.     FFV1Context *s = avctx->priv_data;

  623. 

  624.     s->avctx= avctx;

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

  626. 

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

  628. 

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

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

  631. 

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

  633. 

  634.     return 0;

  635. }

  636. 

  637. #if CONFIG_FFV1_ENCODER

  638. static av_cold int encode_init(AVCodecContext *avctx)

  639. {

  640.     FFV1Context *s = avctx->priv_data;

  641.     int i;

  642. 

  643.     common_init(avctx);

  644. 

  645.     s->version=0;

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

  647. 

  648.     s->plane_count=2;

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

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

  651.             s->quant_table[0][i]=           quant11[i];

  652.             s->quant_table[1][i]=        11*quant11[i];

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

  654.                 s->quant_table[2][i]=     11*11*quant11[i];

  655.                 s->quant_table[3][i]=

  656.                 s->quant_table[4][i]=0;

  657.             }else{

  658.                 s->quant_table[2][i]=     11*11*quant5 [i];

  659.                 s->quant_table[3][i]=   5*11*11*quant5 [i];

  660.                 s->quant_table[4][i]= 5*5*11*11*quant5 [i];

  661.             }

  662.         }else{

  663.             s->quant_table[0][i]=           quant9_10bit[i];

  664.             s->quant_table[1][i]=        11*quant9_10bit[i];

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

  666.                 s->quant_table[2][i]=     11*11*quant9_10bit[i];

  667.                 s->quant_table[3][i]=

  668.                 s->quant_table[4][i]=0;

  669.             }else{

  670.                 s->quant_table[2][i]=     11*11*quant5_10bit[i];

  671.                 s->quant_table[3][i]=   5*11*11*quant5_10bit[i];

  672.                 s->quant_table[4][i]= 5*5*11*11*quant5_10bit[i];

  673.             }

  674.         }

  675.     }

  676. 

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

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

  679. 

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

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

  682.         }else{

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

  684.         }

  685. 

  686.         if(s->ac){

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

  688.         }else{

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

  690.         }

  691.     }

  692. 

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

  694.     switch(avctx->pix_fmt){

  695.     case PIX_FMT_YUV444P16:

  696.     case PIX_FMT_YUV422P16:

  697.     case PIX_FMT_YUV420P16:

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

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

  700.             return -1;

  701.         }

  702.         if(!s->ac){

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

  704.             return -1;

  705.         }

  706.         s->version= 1;

  707.     case PIX_FMT_YUV444P:

  708.     case PIX_FMT_YUV422P:

  709.     case PIX_FMT_YUV420P:

  710.     case PIX_FMT_YUV411P:

  711.     case PIX_FMT_YUV410P:

  712.         s->colorspace= 0;

  713.         break;

  714.     case PIX_FMT_RGB32:

  715.         s->colorspace= 1;

  716.         break;

  717.     default:

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

  719.         return -1;

  720.     }

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

  722. 

  723.     s->picture_number=0;

  724. 

  725.     return 0;

  726. }

  727. #endif /* CONFIG_FFV1_ENCODER */

  728. 

  729. 

  730. static void clear_state(FFV1Context *f){

  731.     int i, j;

  732. 

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

  734.         PlaneContext *p= &f->plane[i];

  735. 

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

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

  738. 

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

  740.             if(f->ac){

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

  742.             }else{

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

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

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

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

  747.             }

  748.         }

  749.     }

  750. }

  751. 

  752. #if CONFIG_FFV1_ENCODER

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

  754.     FFV1Context *f = avctx->priv_data;

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

  756.     AVFrame *pict = data;

  757.     const int width= f->width;

  758.     const int height= f->height;

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

  760.     int used_count= 0;

  761.     uint8_t keystate=128;

  762. 

  763.     ff_init_range_encoder(c, buf, buf_size);

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

  765. 

  766.     *p = *pict;

  767.     p->pict_type= FF_I_TYPE;

  768. 

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

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

  771.         p->key_frame= 1;

  772.         write_header(f);

  773.         clear_state(f);

  774.     }else{

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

  776.         p->key_frame= 0;

  777.     }

  778. 

  779.     if(!f->ac){

  780.         used_count += ff_rac_terminate(c);

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

  782.         init_put_bits(&f->pb, buf + used_count, buf_size - used_count);

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

  784.         int i;

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

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

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

  788.         }

  789.     }

  790. 

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

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

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

  794. 

  795.         encode_plane(f, p->data[0], width, height, p->linesize[0], 0);

  796. 

  797.         encode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);

  798.         encode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);

  799.     }else{

  800.         encode_rgb_frame(f, (uint32_t*)(p->data[0]), width, height, p->linesize[0]/4);

  801.     }

  802.     emms_c();

  803. 

  804.     f->picture_number++;

  805. 

  806.     if(f->ac){

  807.         return ff_rac_terminate(c);

  808.     }else{

  809.         flush_put_bits(&f->pb); //nicer padding FIXME

  810.         return used_count + (put_bits_count(&f->pb)+7)/8;

  811.     }

  812. }

  813. #endif /* CONFIG_FFV1_ENCODER */

  814. 

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

  816.     FFV1Context *s = avctx->priv_data;

  817.     int i;

  818. 

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

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

  821. 

  822.         av_freep(&p->state);

  823.         av_freep(&p->vlc_state);

  824.     }

  825. 

  826.     return 0;

  827. }

  828. 

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

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

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

  832.     int x;

  833.     int run_count=0;

  834.     int run_mode=0;

  835.     int run_index= s->run_index;

  836. 

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

  838.         int diff, context, sign;

  839. 

  840.         context= get_context(s, sample[1] + x, sample[0] + x, sample[1] + x);

  841.         if(context < 0){

  842.             context= -context;

  843.             sign=1;

  844.         }else

  845.             sign=0;

  846. 

  847. 

  848.         if(s->ac){

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

  850.         }else{

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

  852. 

  853.             if(run_mode){

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

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

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

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

  858.                     }else{

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

  860.                         else run_count=0;

  861.                         if(run_index) run_index--;

  862.                         run_mode=2;

  863.                     }

  864.                 }

  865.                 run_count--;

  866.                 if(run_count < 0){

  867.                     run_mode=0;

  868.                     run_count=0;

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

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

  871.                 }else

  872.                     diff=0;

  873.             }else

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

  875. 

  876. //            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));

  877.         }

  878. 

  879.         if(sign) diff= -diff;

  880. 

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

  882.     }

  883.     s->run_index= run_index;

  884. }

  885. 

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

  887.     int x, y;

  888.     int_fast16_t sample_buffer[2][w+6];

  889.     int_fast16_t *sample[2];

  890.     sample[0]=sample_buffer[0]+3;

  891.     sample[1]=sample_buffer[1]+3;

  892. 

  893.     s->run_index=0;

  894. 

  895.     memset(sample_buffer, 0, sizeof(sample_buffer));

  896. 

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

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

  899. 

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

  901.         sample[1]= temp;

  902. 

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

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

  905. 

  906. //{START_TIMER

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

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

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

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

  911.             }

  912.         }else{

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

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

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

  916.             }

  917.         }

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

  919.     }

  920. }

  921. 

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

  923.     int x, y, p;

  924.     int_fast16_t sample_buffer[3][2][w+6];

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

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

  927.         sample[x][0] = sample_buffer[x][0]+3;

  928.         sample[x][1] = sample_buffer[x][1]+3;

  929.     }

  930. 

  931.     s->run_index=0;

  932. 

  933.     memset(sample_buffer, 0, sizeof(sample_buffer));

  934. 

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

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

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

  938. 

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

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

  941. 

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

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

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

  945.         }

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

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

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

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

  950. 

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

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

  953. 

  954.             b -= 0x100;

  955.             r -= 0x100;

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

  957.             b += g;

  958.             r += g;

  959. 

  960.             src[x + stride*y]= b + (g<<8) + (r<<16);

  961.         }

  962.     }

  963. }

  964. 

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

  966.     int v;

  967.     int i=0;

  968.     uint8_t state[CONTEXT_SIZE];

  969. 

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

  971. 

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

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

  974. 

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

  976. 

  977.         while(len--){

  978.             quant_table[i] = scale*v;

  979.             i++;

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

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

  982.         }

  983.     }

  984. 

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

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

  987.     }

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

  989. 

  990.     return 2*v - 1;

  991. }

  992. 

  993. static int read_header(FFV1Context *f){

  994.     uint8_t state[CONTEXT_SIZE];

  995.     int i, context_count;

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

  997. 

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

  999. 

  1000.     f->version= get_symbol(c, state, 0);

  1001.     f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1002.     if(f->ac>1){

  1003.         for(i=1; i<256; i++){

  1004.             f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1005.         }

  1006.     }

  1007.     f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1008.     if(f->version>0)

  1009.         f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1010.     get_rac(c, state); //no chroma = false

  1011.     f->chroma_h_shift= get_symbol(c, state, 0);

  1012.     f->chroma_v_shift= get_symbol(c, state, 0);

  1013.     get_rac(c, state); //transparency plane

  1014.     f->plane_count= 2;

  1015. 

  1016.     if(f->colorspace==0){

  1017.         if(f->avctx->bits_per_raw_sample<=8){

  1018.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1019.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;

  1020.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;

  1021.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;

  1022.             case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;

  1023.             case 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  1024.             default:

  1025.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1026.                 return -1;

  1027.             }

  1028.         }else{

  1029.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1030.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1031.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  1032.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P16; break;

  1033.             default:

  1034.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1035.                 return -1;

  1036.             }

  1037.         }

  1038.     }else if(f->colorspace==1){

  1039.         if(f->chroma_h_shift || f->chroma_v_shift){

  1040.             av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");

  1041.             return -1;

  1042.         }

  1043.         f->avctx->pix_fmt= PIX_FMT_RGB32;

  1044.     }else{

  1045.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  1046.         return -1;

  1047.     }

  1048. 

  1049. //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

  1050. 

  1051.     context_count=1;

  1052.     for(i=0; i<5; i++){

  1053.         context_count*= read_quant_table(c, f->quant_table[i], context_count);

  1054.         if(context_count < 0 || context_count > 32768){

  1055.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1056.             return -1;

  1057.         }

  1058.     }

  1059.     context_count= (context_count+1)/2;

  1060. 

  1061.     for(i=0; i<f->plane_count; i++){

  1062.         PlaneContext * const p= &f->plane[i];

  1063. 

  1064.         p->context_count= context_count;

  1065. 

  1066.         if(f->ac){

  1067.             if(!p->state) p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));

  1068.         }else{

  1069.             if(!p->vlc_state) p->vlc_state= av_malloc(p->context_count*sizeof(VlcState));

  1070.         }

  1071.     }

  1072. 

  1073.     return 0;

  1074. }

  1075. 

  1076. static av_cold int decode_init(AVCodecContext *avctx)

  1077. {

  1078. //    FFV1Context *s = avctx->priv_data;

  1079. 

  1080.     common_init(avctx);

  1081. 

  1082.     return 0;

  1083. }

  1084. 

  1085. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  1086.     const uint8_t *buf = avpkt->data;

  1087.     int buf_size = avpkt->size;

  1088.     FFV1Context *f = avctx->priv_data;

  1089.     RangeCoder * const c= &f->c;

  1090.     const int width= f->width;

  1091.     const int height= f->height;

  1092.     AVFrame * const p= &f->picture;

  1093.     int bytes_read;

  1094.     uint8_t keystate= 128;

  1095. 

  1096.     AVFrame *picture = data;

  1097. 

  1098.     ff_init_range_decoder(c, buf, buf_size);

  1099.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1100. 

  1101. 

  1102.     p->pict_type= FF_I_TYPE; //FIXME I vs. P

  1103.     if(get_rac(c, &keystate)){

  1104.         p->key_frame= 1;

  1105.         if(read_header(f) < 0)

  1106.             return -1;

  1107.         clear_state(f);

  1108.     }else{

  1109.         p->key_frame= 0;

  1110.     }

  1111.     if(f->ac>1){

  1112.         int i;

  1113.         for(i=1; i<256; i++){

  1114.             c->one_state[i]= f->state_transition[i];

  1115.             c->zero_state[256-i]= 256-c->one_state[i];

  1116.         }

  1117.     }

  1118. 

  1119.     if(!f->plane[0].state && !f->plane[0].vlc_state)

  1120.         return -1;

  1121. 

  1122.     p->reference= 0;

  1123.     if(avctx->get_buffer(avctx, p) < 0){

  1124.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1125.         return -1;

  1126.     }

  1127. 

  1128.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  1129.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  1130. 

  1131.     if(!f->ac){

  1132.         bytes_read = c->bytestream - c->bytestream_start - 1;

  1133.         if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME

  1134. //printf("pos=%d\n", bytes_read);

  1135.         init_get_bits(&f->gb, buf + bytes_read, buf_size - bytes_read);

  1136.     } else {

  1137.         bytes_read = 0; /* avoid warning */

  1138.     }

  1139. 

  1140.     if(f->colorspace==0){

  1141.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1142.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1143.         decode_plane(f, p->data[0], width, height, p->linesize[0], 0);

  1144. 

  1145.         decode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);

  1146.         decode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);

  1147.     }else{

  1148.         decode_rgb_frame(f, (uint32_t*)p->data[0], width, height, p->linesize[0]/4);

  1149.     }

  1150. 

  1151.     emms_c();

  1152. 

  1153.     f->picture_number++;

  1154. 

  1155.     *picture= *p;

  1156. 

  1157.     avctx->release_buffer(avctx, p); //FIXME

  1158. 

  1159.     *data_size = sizeof(AVFrame);

  1160. 

  1161.     if(f->ac){

  1162.         bytes_read= c->bytestream - c->bytestream_start - 1;

  1163.         if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of frame\n");

  1164.     }else{

  1165.         bytes_read+= (get_bits_count(&f->gb)+7)/8;

  1166.     }

  1167. 

  1168.     return bytes_read;

  1169. }

  1170. 

  1171. AVCodec ffv1_decoder = {

  1172.     "ffv1",

  1173.     AVMEDIA_TYPE_VIDEO,

  1174.     CODEC_ID_FFV1,

  1175.     sizeof(FFV1Context),

  1176.     decode_init,

  1177.     NULL,

  1178.     common_end,

  1179.     decode_frame,

  1180.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1181.     NULL,

  1182.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1183. };

  1184. 

  1185. #if CONFIG_FFV1_ENCODER

  1186. AVCodec ffv1_encoder = {

  1187.     "ffv1",

  1188.     AVMEDIA_TYPE_VIDEO,

  1189.     CODEC_ID_FFV1,

  1190.     sizeof(FFV1Context),

  1191.     encode_init,

  1192.     encode_frame,

  1193.     common_end,

  1194.     .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},

  1195.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1196. };

  1197. #endif