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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.     int_fast16_t *sample_buffer;

  241. 

  242.     DSPContext dsp;

  243. }FFV1Context;

  244. 

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

  246.     if(bits==8)

  247.         diff= (int8_t)diff;

  248.     else{

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

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

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

  252.     }

  253. 

  254.     return diff;

  255. }

  256. 

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

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

  259.     const int  T= last[ 0];

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

  261. 

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

  263. }

  264. 

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

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

  267.     const int  T= last[ 0];

  268.     const int RT= last[ 1];

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

  270. 

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

  272.         const int TT= last2[0];

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

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

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

  276.     }else

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

  278. }

  279. 

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

  281.     int i;

  282. 

  283.     if(v){

  284.         const int a= FFABS(v);

  285.         const int e= av_log2(a);

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

  287.         if(e<=9){

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

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

  290.             }

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

  292. 

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

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

  295.             }

  296. 

  297.             if(is_signed)

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

  299.         }else{

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

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

  302.             }

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

  304. 

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

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

  307.             }

  308. 

  309.             if(is_signed)

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

  311.         }

  312.     }else{

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

  314.     }

  315. }

  316. 

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

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

  319. }

  320. 

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

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

  323.         return 0;

  324.     else{

  325.         int i, e, a;

  326.         e= 0;

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

  328.             e++;

  329.         }

  330. 

  331.         a= 1;

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

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

  334.         }

  335. 

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

  337.         return (a^e)-e;

  338.     }

  339. }

  340. 

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

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

  343. }

  344. 

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

  346.     int drift= state->drift;

  347.     int count= state->count;

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

  349.     drift += v;

  350. 

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

  352.         count >>= 1;

  353.         drift >>= 1;

  354.         state->error_sum >>= 1;

  355.     }

  356.     count++;

  357. 

  358.     if(drift <= -count){

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

  360. 

  361.         drift += count;

  362.         if(drift <= -count)

  363.             drift= -count + 1;

  364.     }else if(drift > 0){

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

  366. 

  367.         drift -= count;

  368.         if(drift > 0)

  369.             drift= 0;

  370.     }

  371. 

  372.     state->drift= drift;

  373.     state->count= count;

  374. }

  375. 

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

  377.     int i, k, code;

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

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

  380. 

  381.     i= state->count;

  382.     k=0;

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

  384.         k++;

  385.         i += i;

  386.     }

  387. 

  388.     assert(k<=8);

  389. 

  390. #if 0 // JPEG LS

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

  392.     else                                         code= v;

  393. #else

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

  395. #endif

  396. 

  397. //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);

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

  399. 

  400.     update_vlc_state(state, v);

  401. }

  402. 

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

  404.     int k, i, v, ret;

  405. 

  406.     i= state->count;

  407.     k=0;

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

  409.         k++;

  410.         i += i;

  411.     }

  412. 

  413.     assert(k<=8);

  414. 

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

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

  417. 

  418. #if 0 // JPEG LS

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

  420. #else

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

  422. #endif

  423. 

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

  425. 

  426.     update_vlc_state(state, v);

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

  428.     return ret;

  429. }

  430. 

  431. #if CONFIG_FFV1_ENCODER

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

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

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

  435.     int x;

  436.     int run_index= s->run_index;

  437.     int run_count=0;

  438.     int run_mode=0;

  439. 

  440.     if(s->ac){

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

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

  443.             return -1;

  444.         }

  445.     }else{

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

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

  448.             return -1;

  449.         }

  450.     }

  451. 

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

  453.         int diff, context;

  454. 

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

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

  457. 

  458.         if(context < 0){

  459.             context = -context;

  460.             diff= -diff;

  461.         }

  462. 

  463.         diff= fold(diff, bits);

  464. 

  465.         if(s->ac){

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

  467.         }else{

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

  469. 

  470.             if(run_mode){

  471. 

  472.                 if(diff){

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

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

  475.                         run_index++;

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

  477.                     }

  478. 

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

  480.                     if(run_index) run_index--;

  481.                     run_count=0;

  482.                     run_mode=0;

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

  484.                 }else{

  485.                     run_count++;

  486.                 }

  487.             }

  488. 

  489. //            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));

  490. 

  491.             if(run_mode == 0)

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

  493.         }

  494.     }

  495.     if(run_mode){

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

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

  498.             run_index++;

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

  500.         }

  501. 

  502.         if(run_count)

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

  504.     }

  505.     s->run_index= run_index;

  506. 

  507.     return 0;

  508. }

  509. 

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

  511.     int x,y,i;

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

  513.     int_fast16_t *sample[3];

  514.     s->run_index=0;

  515. 

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

  517. 

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

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

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

  521. 

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

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

  524. //{START_TIMER

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

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

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

  528.             }

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

  530.         }else{

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

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

  533.             }

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

  535.         }

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

  537.     }

  538. }

  539. 

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

  541.     int x, y, p, i;

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

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

  544.     s->run_index=0;

  545. 

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

  547. 

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

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

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

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

  552. 

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

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

  555.             int b= v&0xFF;

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

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

  558. 

  559.             b -= g;

  560.             r -= g;

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

  562.             b += 0x100;

  563.             r += 0x100;

  564. 

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

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

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

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

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

  570.         }

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

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

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

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

  575.         }

  576.     }

  577. }

  578. 

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

  580.     int last=0;

  581.     int i;

  582.     uint8_t state[CONTEXT_SIZE];

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

  584. 

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

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

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

  588.             last= i;

  589.         }

  590.     }

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

  592. }

  593. 

  594. static void write_header(FFV1Context *f){

  595.     uint8_t state[CONTEXT_SIZE];

  596.     int i;

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

  598. 

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

  600. 

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

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

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

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

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

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

  607.         }

  608.     }

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

  610.     if(f->version>0)

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

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

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

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

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

  616. 

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

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

  619. }

  620. #endif /* CONFIG_FFV1_ENCODER */

  621. 

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

  623.     FFV1Context *s = avctx->priv_data;

  624. 

  625.     s->avctx= avctx;

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

  627. 

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

  629. 

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

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

  632. 

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

  634. 

  635.     s->sample_buffer = av_malloc(6 * (s->width+6) * sizeof(*s->sample_buffer));

  636.     if (!s->sample_buffer)

  637.         return AVERROR(ENOMEM);

  638. 

  639.     return 0;

  640. }

  641. 

  642. #if CONFIG_FFV1_ENCODER

  643. static av_cold int encode_init(AVCodecContext *avctx)

  644. {

  645.     FFV1Context *s = avctx->priv_data;

  646.     int i;

  647. 

  648.     common_init(avctx);

  649. 

  650.     s->version=0;

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

  652. 

  653.     s->plane_count=2;

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

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

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

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

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

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

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

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

  662.             }else{

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

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

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

  666.             }

  667.         }else{

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

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

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

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

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

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

  674.             }else{

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

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

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

  678.             }

  679.         }

  680.     }

  681. 

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

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

  684. 

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

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

  687.         }else{

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

  689.         }

  690. 

  691.         if(s->ac){

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

  693.         }else{

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

  695.         }

  696.     }

  697. 

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

  699.     switch(avctx->pix_fmt){

  700.     case PIX_FMT_YUV444P16:

  701.     case PIX_FMT_YUV422P16:

  702.     case PIX_FMT_YUV420P16:

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

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

  705.             return -1;

  706.         }

  707.         if(!s->ac){

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

  709.             return -1;

  710.         }

  711.         s->version= 1;

  712.     case PIX_FMT_YUV444P:

  713.     case PIX_FMT_YUV422P:

  714.     case PIX_FMT_YUV420P:

  715.     case PIX_FMT_YUV411P:

  716.     case PIX_FMT_YUV410P:

  717.         s->colorspace= 0;

  718.         break;

  719.     case PIX_FMT_RGB32:

  720.         s->colorspace= 1;

  721.         break;

  722.     default:

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

  724.         return -1;

  725.     }

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

  727. 

  728.     s->picture_number=0;

  729. 

  730.     return 0;

  731. }

  732. #endif /* CONFIG_FFV1_ENCODER */

  733. 

  734. 

  735. static void clear_state(FFV1Context *f){

  736.     int i, j;

  737. 

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

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

  740. 

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

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

  743. 

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

  745.             if(f->ac){

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

  747.             }else{

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

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

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

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

  752.             }

  753.         }

  754.     }

  755. }

  756. 

  757. #if CONFIG_FFV1_ENCODER

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

  759.     FFV1Context *f = avctx->priv_data;

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

  761.     AVFrame *pict = data;

  762.     const int width= f->width;

  763.     const int height= f->height;

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

  765.     int used_count= 0;

  766.     uint8_t keystate=128;

  767. 

  768.     ff_init_range_encoder(c, buf, buf_size);

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

  770. 

  771.     *p = *pict;

  772.     p->pict_type= FF_I_TYPE;

  773. 

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

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

  776.         p->key_frame= 1;

  777.         write_header(f);

  778.         clear_state(f);

  779.     }else{

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

  781.         p->key_frame= 0;

  782.     }

  783. 

  784.     if(!f->ac){

  785.         used_count += ff_rac_terminate(c);

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

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

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

  789.         int i;

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

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

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

  793.         }

  794.     }

  795. 

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

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

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

  799. 

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

  801. 

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

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

  804.     }else{

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

  806.     }

  807.     emms_c();

  808. 

  809.     f->picture_number++;

  810. 

  811.     if(f->ac){

  812.         return ff_rac_terminate(c);

  813.     }else{

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

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

  816.     }

  817. }

  818. #endif /* CONFIG_FFV1_ENCODER */

  819. 

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

  821.     FFV1Context *s = avctx->priv_data;

  822.     int i;

  823. 

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

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

  826. 

  827.         av_freep(&p->state);

  828.         av_freep(&p->vlc_state);

  829.     }

  830. 

  831.     av_freep(&s->sample_buffer);

  832. 

  833.     return 0;

  834. }

  835. 

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

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

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

  839.     int x;

  840.     int run_count=0;

  841.     int run_mode=0;

  842.     int run_index= s->run_index;

  843. 

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

  845.         int diff, context, sign;

  846. 

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

  848.         if(context < 0){

  849.             context= -context;

  850.             sign=1;

  851.         }else

  852.             sign=0;

  853. 

  854. 

  855.         if(s->ac){

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

  857.         }else{

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

  859. 

  860.             if(run_mode){

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

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

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

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

  865.                     }else{

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

  867.                         else run_count=0;

  868.                         if(run_index) run_index--;

  869.                         run_mode=2;

  870.                     }

  871.                 }

  872.                 run_count--;

  873.                 if(run_count < 0){

  874.                     run_mode=0;

  875.                     run_count=0;

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

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

  878.                 }else

  879.                     diff=0;

  880.             }else

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

  882. 

  883. //            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));

  884.         }

  885. 

  886.         if(sign) diff= -diff;

  887. 

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

  889.     }

  890.     s->run_index= run_index;

  891. }

  892. 

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

  894.     int x, y;

  895.     int_fast16_t *sample[2];

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

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

  898. 

  899.     s->run_index=0;

  900. 

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

  902. 

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

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

  905. 

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

  907.         sample[1]= temp;

  908. 

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

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

  911. 

  912. //{START_TIMER

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

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

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

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

  917.             }

  918.         }else{

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

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

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

  922.             }

  923.         }

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

  925.     }

  926. }

  927. 

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

  929.     int x, y, p;

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

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

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

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

  934.     }

  935. 

  936.     s->run_index=0;

  937. 

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

  939. 

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

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

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

  943. 

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

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

  946. 

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

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

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

  950.         }

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

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

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

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

  955. 

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

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

  958. 

  959.             b -= 0x100;

  960.             r -= 0x100;

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

  962.             b += g;

  963.             r += g;

  964. 

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

  966.         }

  967.     }

  968. }

  969. 

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

  971.     int v;

  972.     int i=0;

  973.     uint8_t state[CONTEXT_SIZE];

  974. 

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

  976. 

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

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

  979. 

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

  981. 

  982.         while(len--){

  983.             quant_table[i] = scale*v;

  984.             i++;

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

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

  987.         }

  988.     }

  989. 

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

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

  992.     }

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

  994. 

  995.     return 2*v - 1;

  996. }

  997. 

  998. static int read_header(FFV1Context *f){

  999.     uint8_t state[CONTEXT_SIZE];

  1000.     int i, context_count;

  1001.     RangeCoder * const c= &f->c;

  1002. 

  1003.     memset(state, 128, sizeof(state));

  1004. 

  1005.     f->version= get_symbol(c, state, 0);

  1006.     f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1007.     if(f->ac>1){

  1008.         for(i=1; i<256; i++){

  1009.             f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1010.         }

  1011.     }

  1012.     f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1013.     if(f->version>0)

  1014.         f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1015.     get_rac(c, state); //no chroma = false

  1016.     f->chroma_h_shift= get_symbol(c, state, 0);

  1017.     f->chroma_v_shift= get_symbol(c, state, 0);

  1018.     get_rac(c, state); //transparency plane

  1019.     f->plane_count= 2;

  1020. 

  1021.     if(f->colorspace==0){

  1022.         if(f->avctx->bits_per_raw_sample<=8){

  1023.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1024.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;

  1025.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;

  1026.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;

  1027.             case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;

  1028.             case 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  1029.             default:

  1030.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1031.                 return -1;

  1032.             }

  1033.         }else{

  1034.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1035.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1036.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  1037.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P16; break;

  1038.             default:

  1039.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1040.                 return -1;

  1041.             }

  1042.         }

  1043.     }else if(f->colorspace==1){

  1044.         if(f->chroma_h_shift || f->chroma_v_shift){

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

  1046.             return -1;

  1047.         }

  1048.         f->avctx->pix_fmt= PIX_FMT_RGB32;

  1049.     }else{

  1050.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  1051.         return -1;

  1052.     }

  1053. 

  1054. //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

  1055. 

  1056.     context_count=1;

  1057.     for(i=0; i<5; i++){

  1058.         context_count*= read_quant_table(c, f->quant_table[i], context_count);

  1059.         if(context_count < 0 || context_count > 32768){

  1060.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1061.             return -1;

  1062.         }

  1063.     }

  1064.     context_count= (context_count+1)/2;

  1065. 

  1066.     for(i=0; i<f->plane_count; i++){

  1067.         PlaneContext * const p= &f->plane[i];

  1068. 

  1069.         p->context_count= context_count;

  1070. 

  1071.         if(f->ac){

  1072.             if(!p->state) p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));

  1073.         }else{

  1074.             if(!p->vlc_state) p->vlc_state= av_malloc(p->context_count*sizeof(VlcState));

  1075.         }

  1076.     }

  1077. 

  1078.     return 0;

  1079. }

  1080. 

  1081. static av_cold int decode_init(AVCodecContext *avctx)

  1082. {

  1083. //    FFV1Context *s = avctx->priv_data;

  1084. 

  1085.     common_init(avctx);

  1086. 

  1087.     return 0;

  1088. }

  1089. 

  1090. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  1091.     const uint8_t *buf = avpkt->data;

  1092.     int buf_size = avpkt->size;

  1093.     FFV1Context *f = avctx->priv_data;

  1094.     RangeCoder * const c= &f->c;

  1095.     const int width= f->width;

  1096.     const int height= f->height;

  1097.     AVFrame * const p= &f->picture;

  1098.     int bytes_read;

  1099.     uint8_t keystate= 128;

  1100. 

  1101.     AVFrame *picture = data;

  1102. 

  1103.     ff_init_range_decoder(c, buf, buf_size);

  1104.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1105. 

  1106. 

  1107.     p->pict_type= FF_I_TYPE; //FIXME I vs. P

  1108.     if(get_rac(c, &keystate)){

  1109.         p->key_frame= 1;

  1110.         if(read_header(f) < 0)

  1111.             return -1;

  1112.         clear_state(f);

  1113.     }else{

  1114.         p->key_frame= 0;

  1115.     }

  1116.     if(f->ac>1){

  1117.         int i;

  1118.         for(i=1; i<256; i++){

  1119.             c->one_state[i]= f->state_transition[i];

  1120.             c->zero_state[256-i]= 256-c->one_state[i];

  1121.         }

  1122.     }

  1123. 

  1124.     if(!f->plane[0].state && !f->plane[0].vlc_state)

  1125.         return -1;

  1126. 

  1127.     p->reference= 0;

  1128.     if(avctx->get_buffer(avctx, p) < 0){

  1129.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1130.         return -1;

  1131.     }

  1132. 

  1133.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  1134.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  1135. 

  1136.     if(!f->ac){

  1137.         bytes_read = c->bytestream - c->bytestream_start - 1;

  1138.         if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME

  1139. //printf("pos=%d\n", bytes_read);

  1140.         init_get_bits(&f->gb, buf + bytes_read, buf_size - bytes_read);

  1141.     } else {

  1142.         bytes_read = 0; /* avoid warning */

  1143.     }

  1144. 

  1145.     if(f->colorspace==0){

  1146.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1147.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1148.         decode_plane(f, p->data[0], width, height, p->linesize[0], 0);

  1149. 

  1150.         decode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);

  1151.         decode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);

  1152.     }else{

  1153.         decode_rgb_frame(f, (uint32_t*)p->data[0], width, height, p->linesize[0]/4);

  1154.     }

  1155. 

  1156.     emms_c();

  1157. 

  1158.     f->picture_number++;

  1159. 

  1160.     *picture= *p;

  1161. 

  1162.     avctx->release_buffer(avctx, p); //FIXME

  1163. 

  1164.     *data_size = sizeof(AVFrame);

  1165. 

  1166.     if(f->ac){

  1167.         bytes_read= c->bytestream - c->bytestream_start - 1;

  1168.         if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of frame\n");

  1169.     }else{

  1170.         bytes_read+= (get_bits_count(&f->gb)+7)/8;

  1171.     }

  1172. 

  1173.     return bytes_read;

  1174. }

  1175. 

  1176. AVCodec ffv1_decoder = {

  1177.     "ffv1",

  1178.     AVMEDIA_TYPE_VIDEO,

  1179.     CODEC_ID_FFV1,

  1180.     sizeof(FFV1Context),

  1181.     decode_init,

  1182.     NULL,

  1183.     common_end,

  1184.     decode_frame,

  1185.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1186.     NULL,

  1187.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1188. };

  1189. 

  1190. #if CONFIG_FFV1_ENCODER

  1191. AVCodec ffv1_encoder = {

  1192.     "ffv1",

  1193.     AVMEDIA_TYPE_VIDEO,

  1194.     CODEC_ID_FFV1,

  1195.     sizeof(FFV1Context),

  1196.     encode_init,

  1197.     encode_frame,

  1198.     common_end,

  1199.     .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},

  1200.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1201. };

  1202. #endif