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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. #define MAX_QUANT_TABLES 8

  40. 

  41. extern const uint8_t ff_log2_run[32];

  42. 

  43. static const int8_t quant3[256]={

  44.  0, 0, 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,-1,

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

  59. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0,

  60. };

  61. 

  62. static const int8_t quant5_10bit[256]={

  63.  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,

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

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

  66.  1, 1, 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,-2,

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

  75. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,

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

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

  78. -1,-1,-1,-1,-1,-1,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,

  79. };

  80. 

  81. static const int8_t quant5[256]={

  82.  0, 1, 1, 1, 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,-2,-2,-2,

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

  97. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,-1,

  98. };

  99. static const int8_t quant7[256]={

  100.  0, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  101.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  102.  2, 2, 2, 2, 2, 2, 2, 2, 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,-3,-3,-3,-3,-3,-3,-3,

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

  113. -3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,

  114. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  115. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,

  116. };

  117. static const int8_t quant9[256]={

  118.  0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  119.  3, 3, 3, 3, 3, 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,-4,-4,-4,-4,

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

  132. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,

  133. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-1,-1,

  134. };

  135. static const int8_t quant9_10bit[256]={

  136.  0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2,

  137.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3,

  138.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  139.  3, 3, 3, 3, 3, 3, 3, 3, 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,-4,-4,-4,-4,-4,-4,-4,

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

  148. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,

  149. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  150. -3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  151. -2,-2,-2,-2,-1,-1,-1,-1,-1,-1,-1,-1,-0,-0,-0,-0,

  152. };

  153. 

  154. static const int8_t quant11[256]={

  155.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

  156.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  157.  4, 4, 4, 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,-5,-5,

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

  168. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-4,-4,

  169. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  170. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  171. };

  172. static const int8_t quant13[256]={

  173.  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  174.  4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  175.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  176.  5, 5, 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,-6,

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

  185. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-5,

  186. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

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

  188. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,

  189. };

  190. 

  191. static const uint8_t ver2_state[256]= {

  192.    0,  10,  10,  10,  10,  16,  16,  16,  28,  16,  16,  29,  42,  49,  20,  49,

  193.   59,  25,  26,  26,  27,  31,  33,  33,  33,  34,  34,  37,  67,  38,  39,  39,

  194.   40,  40,  41,  79,  43,  44,  45,  45,  48,  48,  64,  50,  51,  52,  88,  52,

  195.   53,  74,  55,  57,  58,  58,  74,  60, 101,  61,  62,  84,  66,  66,  68,  69,

  196.   87,  82,  71,  97,  73,  73,  82,  75, 111,  77,  94,  78,  87,  81,  83,  97,

  197.   85,  83,  94,  86,  99,  89,  90,  99, 111,  92,  93, 134,  95,  98, 105,  98,

  198.  105, 110, 102, 108, 102, 118, 103, 106, 106, 113, 109, 112, 114, 112, 116, 125,

  199.  115, 116, 117, 117, 126, 119, 125, 121, 121, 123, 145, 124, 126, 131, 127, 129,

  200.  165, 130, 132, 138, 133, 135, 145, 136, 137, 139, 146, 141, 143, 142, 144, 148,

  201.  147, 155, 151, 149, 151, 150, 152, 157, 153, 154, 156, 168, 158, 162, 161, 160,

  202.  172, 163, 169, 164, 166, 184, 167, 170, 177, 174, 171, 173, 182, 176, 180, 178,

  203.  175, 189, 179, 181, 186, 183, 192, 185, 200, 187, 191, 188, 190, 197, 193, 196,

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

  205.  209, 211, 221, 212, 213, 215, 224, 216, 217, 218, 219, 220, 222, 228, 223, 225,

  206.  226, 224, 227, 229, 240, 230, 231, 232, 233, 234, 235, 236, 238, 239, 237, 242,

  207.  241, 243, 242, 244, 245, 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 255,

  208. };

  209. 

  210. typedef struct VlcState{

  211.     int16_t drift;

  212.     uint16_t error_sum;

  213.     int8_t bias;

  214.     uint8_t count;

  215. } VlcState;

  216. 

  217. typedef struct PlaneContext{

  218.     int context_count;

  219.     uint8_t (*state)[CONTEXT_SIZE];

  220.     VlcState *vlc_state;

  221.     uint8_t interlace_bit_state[2];

  222. } PlaneContext;

  223. 

  224. typedef struct FFV1Context{

  225.     AVCodecContext *avctx;

  226.     RangeCoder c;

  227.     GetBitContext gb;

  228.     PutBitContext pb;

  229.     int version;

  230.     int width, height;

  231.     int chroma_h_shift, chroma_v_shift;

  232.     int flags;

  233.     int picture_number;

  234.     AVFrame picture;

  235.     int plane_count;

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

  237.     PlaneContext plane[MAX_PLANES];

  238.     int16_t quant_table[5][256];

  239.     int16_t quant_tables[MAX_QUANT_TABLES][5][256];

  240.     int context_count[MAX_QUANT_TABLES];

  241.     uint8_t state_transition[256];

  242.     int run_index;

  243.     int colorspace;

  244.     int_fast16_t *sample_buffer;

  245. 

  246.     int quant_table_count;

  247. 

  248.     DSPContext dsp;

  249. }FFV1Context;

  250. 

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

  252.     if(bits==8)

  253.         diff= (int8_t)diff;

  254.     else{

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

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

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

  258.     }

  259. 

  260.     return diff;

  261. }

  262. 

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

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

  265.     const int  T= last[ 0];

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

  267. 

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

  269. }

  270. 

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

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

  273.     const int  T= last[ 0];

  274.     const int RT= last[ 1];

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

  276. 

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

  278.         const int TT= last2[0];

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

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

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

  282.     }else

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

  284. }

  285. 

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

  287.     int i;

  288. 

  289.     if(v){

  290.         const int a= FFABS(v);

  291.         const int e= av_log2(a);

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

  293.         if(e<=9){

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

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

  296.             }

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

  298. 

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

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

  301.             }

  302. 

  303.             if(is_signed)

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

  305.         }else{

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

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

  308.             }

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

  310. 

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

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

  313.             }

  314. 

  315.             if(is_signed)

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

  317.         }

  318.     }else{

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

  320.     }

  321. }

  322. 

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

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

  325. }

  326. 

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

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

  329.         return 0;

  330.     else{

  331.         int i, e, a;

  332.         e= 0;

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

  334.             e++;

  335.         }

  336. 

  337.         a= 1;

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

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

  340.         }

  341. 

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

  343.         return (a^e)-e;

  344.     }

  345. }

  346. 

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

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

  349. }

  350. 

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

  352.     int drift= state->drift;

  353.     int count= state->count;

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

  355.     drift += v;

  356. 

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

  358.         count >>= 1;

  359.         drift >>= 1;

  360.         state->error_sum >>= 1;

  361.     }

  362.     count++;

  363. 

  364.     if(drift <= -count){

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

  366. 

  367.         drift += count;

  368.         if(drift <= -count)

  369.             drift= -count + 1;

  370.     }else if(drift > 0){

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

  372. 

  373.         drift -= count;

  374.         if(drift > 0)

  375.             drift= 0;

  376.     }

  377. 

  378.     state->drift= drift;

  379.     state->count= count;

  380. }

  381. 

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

  383.     int i, k, code;

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

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

  386. 

  387.     i= state->count;

  388.     k=0;

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

  390.         k++;

  391.         i += i;

  392.     }

  393. 

  394.     assert(k<=8);

  395. 

  396. #if 0 // JPEG LS

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

  398.     else                                         code= v;

  399. #else

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

  401. #endif

  402. 

  403. //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);

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

  405. 

  406.     update_vlc_state(state, v);

  407. }

  408. 

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

  410.     int k, i, v, ret;

  411. 

  412.     i= state->count;

  413.     k=0;

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

  415.         k++;

  416.         i += i;

  417.     }

  418. 

  419.     assert(k<=8);

  420. 

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

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

  423. 

  424. #if 0 // JPEG LS

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

  426. #else

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

  428. #endif

  429. 

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

  431. 

  432.     update_vlc_state(state, v);

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

  434.     return ret;

  435. }

  436. 

  437. #if CONFIG_FFV1_ENCODER

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

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

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

  441.     int x;

  442.     int run_index= s->run_index;

  443.     int run_count=0;

  444.     int run_mode=0;

  445. 

  446.     if(s->ac){

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

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

  449.             return -1;

  450.         }

  451.     }else{

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

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

  454.             return -1;

  455.         }

  456.     }

  457. 

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

  459.         int diff, context;

  460. 

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

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

  463. 

  464.         if(context < 0){

  465.             context = -context;

  466.             diff= -diff;

  467.         }

  468. 

  469.         diff= fold(diff, bits);

  470. 

  471.         if(s->ac){

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

  473.         }else{

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

  475. 

  476.             if(run_mode){

  477. 

  478.                 if(diff){

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

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

  481.                         run_index++;

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

  483.                     }

  484. 

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

  486.                     if(run_index) run_index--;

  487.                     run_count=0;

  488.                     run_mode=0;

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

  490.                 }else{

  491.                     run_count++;

  492.                 }

  493.             }

  494. 

  495. //            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));

  496. 

  497.             if(run_mode == 0)

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

  499.         }

  500.     }

  501.     if(run_mode){

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

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

  504.             run_index++;

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

  506.         }

  507. 

  508.         if(run_count)

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

  510.     }

  511.     s->run_index= run_index;

  512. 

  513.     return 0;

  514. }

  515. 

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

  517.     int x,y,i;

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

  519.     int_fast16_t *sample[3];

  520.     s->run_index=0;

  521. 

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

  523. 

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

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

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

  527. 

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

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

  530. //{START_TIMER

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

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

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

  534.             }

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

  536.         }else{

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

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

  539.             }

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

  541.         }

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

  543.     }

  544. }

  545. 

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

  547.     int x, y, p, i;

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

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

  550.     s->run_index=0;

  551. 

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

  553. 

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

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

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

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

  558. 

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

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

  561.             int b= v&0xFF;

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

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

  564. 

  565.             b -= g;

  566.             r -= g;

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

  568.             b += 0x100;

  569.             r += 0x100;

  570. 

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

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

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

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

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

  576.         }

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

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

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

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

  581.         }

  582.     }

  583. }

  584. 

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

  586.     int last=0;

  587.     int i;

  588.     uint8_t state[CONTEXT_SIZE];

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

  590. 

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

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

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

  594.             last= i;

  595.         }

  596.     }

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

  598. }

  599. 

  600. static void write_quant_tables(RangeCoder *c, int16_t quant_table[5][256]){

  601.     int i;

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

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

  604. }

  605. 

  606. static void write_header(FFV1Context *f){

  607.     uint8_t state[CONTEXT_SIZE];

  608.     int i;

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

  610. 

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

  612. 

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

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

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

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

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

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

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

  620.         }

  621.     }

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

  623.     if(f->version>0)

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

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

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

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

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

  629. 

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

  631.     }else{

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

  633.     }

  634. }

  635. #endif /* CONFIG_FFV1_ENCODER */

  636. 

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

  638.     FFV1Context *s = avctx->priv_data;

  639. 

  640.     s->avctx= avctx;

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

  642. 

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

  644. 

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

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

  647. 

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

  649. 

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

  651.     if (!s->sample_buffer)

  652.         return AVERROR(ENOMEM);

  653. 

  654.     return 0;

  655. }

  656. 

  657. #if CONFIG_FFV1_ENCODER

  658. static int write_extra_header(FFV1Context *f){

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

  660.     uint8_t state[CONTEXT_SIZE];

  661.     int i;

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

  663. 

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

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

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

  667. 

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

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

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

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

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

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

  674.         }

  675.     }

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

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

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

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

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

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

  682. 

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

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

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

  686. 

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

  688. 

  689.     return 0;

  690. }

  691. 

  692. static av_cold int encode_init(AVCodecContext *avctx)

  693. {

  694.     FFV1Context *s = avctx->priv_data;

  695.     int i;

  696. 

  697.     common_init(avctx);

  698. 

  699.     s->version=0;

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

  701. 

  702.     s->plane_count=2;

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

  704.         s->quant_table_count=2;

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

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

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

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

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

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

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

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

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

  714.         }else{

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

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

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

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

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

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

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

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

  723.         }

  724.     }

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

  726. 

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

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

  729. 

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

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

  732.         }else{

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

  734.         }

  735. 

  736.         if(s->ac){

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

  738.         }else{

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

  740.         }

  741.     }

  742. 

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

  744.     switch(avctx->pix_fmt){

  745.     case PIX_FMT_YUV444P16:

  746.     case PIX_FMT_YUV422P16:

  747.     case PIX_FMT_YUV420P16:

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

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

  750.             return -1;

  751.         }

  752.         if(!s->ac){

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

  754.             return -1;

  755.         }

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

  757.     case PIX_FMT_YUV444P:

  758.     case PIX_FMT_YUV422P:

  759.     case PIX_FMT_YUV420P:

  760.     case PIX_FMT_YUV411P:

  761.     case PIX_FMT_YUV410P:

  762.         s->colorspace= 0;

  763.         break;

  764.     case PIX_FMT_RGB32:

  765.         s->colorspace= 1;

  766.         break;

  767.     default:

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

  769.         return -1;

  770.     }

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

  772. 

  773.     s->picture_number=0;

  774. 

  775.     if(s->version>1)

  776.         write_extra_header(s);

  777. 

  778.     return 0;

  779. }

  780. #endif /* CONFIG_FFV1_ENCODER */

  781. 

  782. 

  783. static void clear_state(FFV1Context *f){

  784.     int i, j;

  785. 

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

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

  788. 

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

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

  791. 

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

  793.             if(f->ac){

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

  795.             }else{

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

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

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

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

  800.             }

  801.         }

  802.     }

  803. }

  804. 

  805. #if CONFIG_FFV1_ENCODER

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

  807.     FFV1Context *f = avctx->priv_data;

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

  809.     AVFrame *pict = data;

  810.     const int width= f->width;

  811.     const int height= f->height;

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

  813.     int used_count= 0;

  814.     uint8_t keystate=128;

  815. 

  816.     ff_init_range_encoder(c, buf, buf_size);

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

  818. 

  819.     *p = *pict;

  820.     p->pict_type= FF_I_TYPE;

  821. 

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

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

  824.         p->key_frame= 1;

  825.         write_header(f);

  826.         clear_state(f);

  827.     }else{

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

  829.         p->key_frame= 0;

  830.     }

  831. 

  832.     if(!f->ac){

  833.         used_count += ff_rac_terminate(c);

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

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

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

  837.         int i;

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

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

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

  841.         }

  842.     }

  843. 

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

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

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

  847. 

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

  849. 

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

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

  852.     }else{

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

  854.     }

  855.     emms_c();

  856. 

  857.     f->picture_number++;

  858. 

  859.     if(f->ac){

  860.         return ff_rac_terminate(c);

  861.     }else{

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

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

  864.     }

  865. }

  866. #endif /* CONFIG_FFV1_ENCODER */

  867. 

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

  869.     FFV1Context *s = avctx->priv_data;

  870.     int i;

  871. 

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

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

  874. 

  875.         av_freep(&p->state);

  876.         av_freep(&p->vlc_state);

  877.     }

  878. 

  879.     av_freep(&s->sample_buffer);

  880. 

  881.     return 0;

  882. }

  883. 

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

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

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

  887.     int x;

  888.     int run_count=0;

  889.     int run_mode=0;

  890.     int run_index= s->run_index;

  891. 

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

  893.         int diff, context, sign;

  894. 

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

  896.         if(context < 0){

  897.             context= -context;

  898.             sign=1;

  899.         }else

  900.             sign=0;

  901. 

  902. 

  903.         if(s->ac){

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

  905.         }else{

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

  907. 

  908.             if(run_mode){

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

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

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

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

  913.                     }else{

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

  915.                         else run_count=0;

  916.                         if(run_index) run_index--;

  917.                         run_mode=2;

  918.                     }

  919.                 }

  920.                 run_count--;

  921.                 if(run_count < 0){

  922.                     run_mode=0;

  923.                     run_count=0;

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

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

  926.                 }else

  927.                     diff=0;

  928.             }else

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

  930. 

  931. //            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));

  932.         }

  933. 

  934.         if(sign) diff= -diff;

  935. 

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

  937.     }

  938.     s->run_index= run_index;

  939. }

  940. 

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

  942.     int x, y;

  943.     int_fast16_t *sample[2];

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

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

  946. 

  947.     s->run_index=0;

  948. 

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

  950. 

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

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

  953. 

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

  955.         sample[1]= temp;

  956. 

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

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

  959. 

  960. //{START_TIMER

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

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

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

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

  965.             }

  966.         }else{

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

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

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

  970.             }

  971.         }

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

  973.     }

  974. }

  975. 

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

  977.     int x, y, p;

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

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

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

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

  982.     }

  983. 

  984.     s->run_index=0;

  985. 

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

  987. 

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

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

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

  991. 

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

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

  994. 

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

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

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

  998.         }

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

  1000.             int g= sample[0][1][x];

  1001.             int b= sample[1][1][x];

  1002.             int r= sample[2][1][x];

  1003. 

  1004. //            assert(g>=0 && b>=0 && r>=0);

  1005. //            assert(g<256 && b<512 && r<512);

  1006. 

  1007.             b -= 0x100;

  1008.             r -= 0x100;

  1009.             g -= (b + r)>>2;

  1010.             b += g;

  1011.             r += g;

  1012. 

  1013.             src[x + stride*y]= b + (g<<8) + (r<<16) + (0xFF<<24);

  1014.         }

  1015.     }

  1016. }

  1017. 

  1018. static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale){

  1019.     int v;

  1020.     int i=0;

  1021.     uint8_t state[CONTEXT_SIZE];

  1022. 

  1023.     memset(state, 128, sizeof(state));

  1024. 

  1025.     for(v=0; i<128 ; v++){

  1026.         int len= get_symbol(c, state, 0) + 1;

  1027. 

  1028.         if(len + i > 128) return -1;

  1029. 

  1030.         while(len--){

  1031.             quant_table[i] = scale*v;

  1032.             i++;

  1033. //printf("%2d ",v);

  1034. //if(i%16==0) printf("\n");

  1035.         }

  1036.     }

  1037. 

  1038.     for(i=1; i<128; i++){

  1039.         quant_table[256-i]= -quant_table[i];

  1040.     }

  1041.     quant_table[128]= -quant_table[127];

  1042. 

  1043.     return 2*v - 1;

  1044. }

  1045. 

  1046. static int read_quant_tables(RangeCoder *c, int16_t quant_table[5][256]){

  1047.     int i;

  1048.     int context_count=1;

  1049. 

  1050.     for(i=0; i<5; i++){

  1051.         context_count*= read_quant_table(c, quant_table[i], context_count);

  1052.         if(context_count > 32768U){

  1053.             return -1;

  1054.         }

  1055.     }

  1056.     return (context_count+1)/2;

  1057. }

  1058. 

  1059. static int read_extra_header(FFV1Context *f){

  1060.     RangeCoder * const c= &f->c;

  1061.     uint8_t state[CONTEXT_SIZE];

  1062.     int i;

  1063. 

  1064.     memset(state, 128, sizeof(state));

  1065. 

  1066.     ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);

  1067.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1068. 

  1069.     f->version= get_symbol(c, state, 0);

  1070.     f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1071.     if(f->ac>1){

  1072.         for(i=1; i<256; i++){

  1073.             f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1074.         }

  1075.     }

  1076.     f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1077.     f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1078.     get_rac(c, state); //no chroma = false

  1079.     f->chroma_h_shift= get_symbol(c, state, 0);

  1080.     f->chroma_v_shift= get_symbol(c, state, 0);

  1081.     get_rac(c, state); //transparency plane

  1082.     f->plane_count= 2;

  1083. 

  1084.     f->quant_table_count= get_symbol(c, state, 0);

  1085.     if(f->quant_table_count > (unsigned)MAX_QUANT_TABLES)

  1086.         return -1;

  1087.     for(i=0; i<f->quant_table_count; i++){

  1088.         if((f->context_count[i]= read_quant_tables(c, f->quant_tables[i])) < 0){

  1089.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1090.             return -1;

  1091.         }

  1092.     }

  1093. 

  1094.     return 0;

  1095. }

  1096. 

  1097. static int read_header(FFV1Context *f){

  1098.     uint8_t state[CONTEXT_SIZE];

  1099.     int i, context_count;

  1100.     RangeCoder * const c= &f->c;

  1101. 

  1102.     memset(state, 128, sizeof(state));

  1103. 

  1104.     if(f->version < 2){

  1105.     f->version= get_symbol(c, state, 0);

  1106.     f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1107.     if(f->ac>1){

  1108.         for(i=1; i<256; i++){

  1109.             f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1110.         }

  1111.     }

  1112.     f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1113.     if(f->version>0)

  1114.         f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1115.     get_rac(c, state); //no chroma = false

  1116.     f->chroma_h_shift= get_symbol(c, state, 0);

  1117.     f->chroma_v_shift= get_symbol(c, state, 0);

  1118.     get_rac(c, state); //transparency plane

  1119.     f->plane_count= 2;

  1120.     }

  1121. 

  1122.     if(f->colorspace==0){

  1123.         if(f->avctx->bits_per_raw_sample<=8){

  1124.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1125.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;

  1126.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;

  1127.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;

  1128.             case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;

  1129.             case 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  1130.             default:

  1131.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1132.                 return -1;

  1133.             }

  1134.         }else{

  1135.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1136.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1137.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  1138.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P16; break;

  1139.             default:

  1140.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1141.                 return -1;

  1142.             }

  1143.         }

  1144.     }else if(f->colorspace==1){

  1145.         if(f->chroma_h_shift || f->chroma_v_shift){

  1146.             av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");

  1147.             return -1;

  1148.         }

  1149.         f->avctx->pix_fmt= PIX_FMT_RGB32;

  1150.     }else{

  1151.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  1152.         return -1;

  1153.     }

  1154. 

  1155. //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

  1156.     if(f->version < 2){

  1157.     context_count= read_quant_tables(c, f->quant_table);

  1158.     if(context_count < 0){

  1159.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1160.             return -1;

  1161.         }

  1162. 

  1163.     }else{

  1164.         i=get_symbol(c, state, 0);

  1165.         if(i > (unsigned)f->quant_table_count){

  1166.             av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");

  1167.             return -1;

  1168.         }

  1169.         memcpy(f->quant_table, f->quant_tables[i], sizeof(f->quant_table));

  1170.         context_count= f->context_count[i];

  1171.     }

  1172.     for(i=0; i<f->plane_count; i++){

  1173.         PlaneContext * const p= &f->plane[i];

  1174. 

  1175.         p->context_count= context_count;

  1176. 

  1177.         if(f->ac){

  1178.             if(!p->state) p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));

  1179.         }else{

  1180.             if(!p->vlc_state) p->vlc_state= av_malloc(p->context_count*sizeof(VlcState));

  1181.         }

  1182.     }

  1183. 

  1184.     return 0;

  1185. }

  1186. 

  1187. static av_cold int decode_init(AVCodecContext *avctx)

  1188. {

  1189.     FFV1Context *f = avctx->priv_data;

  1190. 

  1191.     common_init(avctx);

  1192. 

  1193.     if(avctx->extradata)

  1194.         return read_extra_header(f);

  1195. 

  1196.     return 0;

  1197. }

  1198. 

  1199. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  1200.     const uint8_t *buf = avpkt->data;

  1201.     int buf_size = avpkt->size;

  1202.     FFV1Context *f = avctx->priv_data;

  1203.     RangeCoder * const c= &f->c;

  1204.     const int width= f->width;

  1205.     const int height= f->height;

  1206.     AVFrame * const p= &f->picture;

  1207.     int bytes_read;

  1208.     uint8_t keystate= 128;

  1209. 

  1210.     AVFrame *picture = data;

  1211. 

  1212.     ff_init_range_decoder(c, buf, buf_size);

  1213.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1214. 

  1215. 

  1216.     p->pict_type= FF_I_TYPE; //FIXME I vs. P

  1217.     if(get_rac(c, &keystate)){

  1218.         p->key_frame= 1;

  1219.         if(read_header(f) < 0)

  1220.             return -1;

  1221.         clear_state(f);

  1222.     }else{

  1223.         p->key_frame= 0;

  1224.     }

  1225.     if(f->ac>1){

  1226.         int i;

  1227.         for(i=1; i<256; i++){

  1228.             c->one_state[i]= f->state_transition[i];

  1229.             c->zero_state[256-i]= 256-c->one_state[i];

  1230.         }

  1231.     }

  1232. 

  1233.     if(!f->plane[0].state && !f->plane[0].vlc_state)

  1234.         return -1;

  1235. 

  1236.     p->reference= 0;

  1237.     if(avctx->get_buffer(avctx, p) < 0){

  1238.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1239.         return -1;

  1240.     }

  1241. 

  1242.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  1243.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  1244. 

  1245.     if(!f->ac){

  1246.         bytes_read = c->bytestream - c->bytestream_start - 1;

  1247.         if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME

  1248. //printf("pos=%d\n", bytes_read);

  1249.         init_get_bits(&f->gb, buf + bytes_read, buf_size - bytes_read);

  1250.     } else {

  1251.         bytes_read = 0; /* avoid warning */

  1252.     }

  1253. 

  1254.     if(f->colorspace==0){

  1255.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1256.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1257.         decode_plane(f, p->data[0], width, height, p->linesize[0], 0);

  1258. 

  1259.         decode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);

  1260.         decode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);

  1261.     }else{

  1262.         decode_rgb_frame(f, (uint32_t*)p->data[0], width, height, p->linesize[0]/4);

  1263.     }

  1264. 

  1265.     emms_c();

  1266. 

  1267.     f->picture_number++;

  1268. 

  1269.     *picture= *p;

  1270. 

  1271.     avctx->release_buffer(avctx, p); //FIXME

  1272. 

  1273.     *data_size = sizeof(AVFrame);

  1274. 

  1275.     if(f->ac){

  1276.         bytes_read= c->bytestream - c->bytestream_start - 1;

  1277.         if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of frame\n");

  1278.     }else{

  1279.         bytes_read+= (get_bits_count(&f->gb)+7)/8;

  1280.     }

  1281. 

  1282.     return bytes_read;

  1283. }

  1284. 

  1285. AVCodec ffv1_decoder = {

  1286.     "ffv1",

  1287.     AVMEDIA_TYPE_VIDEO,

  1288.     CODEC_ID_FFV1,

  1289.     sizeof(FFV1Context),

  1290.     decode_init,

  1291.     NULL,

  1292.     common_end,

  1293.     decode_frame,

  1294.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1295.     NULL,

  1296.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1297. };

  1298. 

  1299. #if CONFIG_FFV1_ENCODER

  1300. AVCodec ffv1_encoder = {

  1301.     "ffv1",

  1302.     AVMEDIA_TYPE_VIDEO,

  1303.     CODEC_ID_FFV1,

  1304.     sizeof(FFV1Context),

  1305.     encode_init,

  1306.     encode_frame,

  1307.     common_end,

  1308.     .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},

  1309.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1310. };

  1311. #endif