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FFmpeg/libavcodec/ffv1.c

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  1. /*

  2.  * FFV1 codec for libavcodec

  3.  *

  4.  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * FF Video Codec 1 (a lossless codec)

  26.  */

  27. 

  28. #include "avcodec.h"

  29. #include "get_bits.h"

  30. #include "put_bits.h"

  31. #include "dsputil.h"

  32. #include "rangecoder.h"

  33. #include "golomb.h"

  34. #include "mathops.h"

  35. #include "libavutil/avassert.h"

  36. 

  37. #define MAX_PLANES 4

  38. #define CONTEXT_SIZE 32

  39. 

  40. #define MAX_QUANT_TABLES 8

  41. #define MAX_CONTEXT_INPUTS 5

  42. 

  43. extern const uint8_t ff_log2_run[41];

  44. 

  45. static const int8_t quant3[256]={

  46.  0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  47.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  48.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  49.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  50.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  51.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  52.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  53.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  54. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  55. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  56. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  57. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

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

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

  60. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

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

  62. };

  63. 

  64. static const int8_t quant5_10bit[256]={

  65.  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,

  66.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  67.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  68.  1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  69.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  70.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  71.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  72.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  73. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

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

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

  76. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  77. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,

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

  79. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  80. -1,-1,-1,-1,-1,-1,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,

  81. };

  82. 

  83. static const int8_t quant5[256]={

  84.  0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  85.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  86.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  87.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  88.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  89.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  90.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  91.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  92. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  93. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  94. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  95. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

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

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

  98. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  99. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,-1,

  100. };

  101. static const int8_t quant7[256]={

  102.  0, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  103.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

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

  105.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  106.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  107.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  108.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  109.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  110. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  111. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

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

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

  114. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  115. -3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,

  116. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  117. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,

  118. };

  119. static const int8_t quant9[256]={

  120.  0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3,

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

  122.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  123.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  124.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  125.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  126.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  127.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  128. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  129. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  130. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

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

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

  133. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  134. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,

  135. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-1,-1,

  136. };

  137. static const int8_t quant9_10bit[256]={

  138.  0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2,

  139.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3,

  140.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

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

  142.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  143.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  144.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  145.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  146. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

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

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

  149. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  150. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,

  151. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  152. -3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  153. -2,-2,-2,-2,-1,-1,-1,-1,-1,-1,-1,-1,-0,-0,-0,-0,

  154. };

  155. 

  156. static const int8_t quant11[256]={

  157.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

  158.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

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

  160.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  161.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  162.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  163.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  164.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  165. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  166. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

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

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

  169. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  170. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-4,-4,

  171. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  172. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  173. };

  174. static const int8_t quant13[256]={

  175.  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  176.  4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  177.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  178.  5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  179.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  180.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  181.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  182.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  183. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

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

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

  186. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  187. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-5,

  188. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  189. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  190. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,

  191. };

  192. 

  193. static const uint8_t ver2_state[256]= {

  194.    0,  10,  10,  10,  10,  16,  16,  16,  28,  16,  16,  29,  42,  49,  20,  49,

  195.   59,  25,  26,  26,  27,  31,  33,  33,  33,  34,  34,  37,  67,  38,  39,  39,

  196.   40,  40,  41,  79,  43,  44,  45,  45,  48,  48,  64,  50,  51,  52,  88,  52,

  197.   53,  74,  55,  57,  58,  58,  74,  60, 101,  61,  62,  84,  66,  66,  68,  69,

  198.   87,  82,  71,  97,  73,  73,  82,  75, 111,  77,  94,  78,  87,  81,  83,  97,

  199.   85,  83,  94,  86,  99,  89,  90,  99, 111,  92,  93, 134,  95,  98, 105,  98,

  200.  105, 110, 102, 108, 102, 118, 103, 106, 106, 113, 109, 112, 114, 112, 116, 125,

  201.  115, 116, 117, 117, 126, 119, 125, 121, 121, 123, 145, 124, 126, 131, 127, 129,

  202.  165, 130, 132, 138, 133, 135, 145, 136, 137, 139, 146, 141, 143, 142, 144, 148,

  203.  147, 155, 151, 149, 151, 150, 152, 157, 153, 154, 156, 168, 158, 162, 161, 160,

  204.  172, 163, 169, 164, 166, 184, 167, 170, 177, 174, 171, 173, 182, 176, 180, 178,

  205.  175, 189, 179, 181, 186, 183, 192, 185, 200, 187, 191, 188, 190, 197, 193, 196,

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

  207.  209, 211, 221, 212, 213, 215, 224, 216, 217, 218, 219, 220, 222, 228, 223, 225,

  208.  226, 224, 227, 229, 240, 230, 231, 232, 233, 234, 235, 236, 238, 239, 237, 242,

  209.  241, 243, 242, 244, 245, 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 255,

  210. };

  211. 

  212. typedef struct VlcState{

  213.     int16_t drift;

  214.     uint16_t error_sum;

  215.     int8_t bias;

  216.     uint8_t count;

  217. } VlcState;

  218. 

  219. typedef struct PlaneContext{

  220.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

  221.     int quant_table_index;

  222.     int context_count;

  223.     uint8_t (*state)[CONTEXT_SIZE];

  224.     VlcState *vlc_state;

  225.     uint8_t interlace_bit_state[2];

  226. } PlaneContext;

  227. 

  228. #define MAX_SLICES 256

  229. 

  230. typedef struct FFV1Context{

  231.     AVCodecContext *avctx;

  232.     RangeCoder c;

  233.     GetBitContext gb;

  234.     PutBitContext pb;

  235.     uint64_t rc_stat[256][2];

  236.     uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];

  237.     int version;

  238.     int width, height;

  239.     int chroma_h_shift, chroma_v_shift;

  240.     int flags;

  241.     int picture_number;

  242.     AVFrame picture;

  243.     int plane_count;

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

  245.     PlaneContext plane[MAX_PLANES];

  246.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

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

  248.     int context_count[MAX_QUANT_TABLES];

  249.     uint8_t state_transition[256];

  250.     uint8_t (*initial_states[MAX_QUANT_TABLES])[32];

  251.     int run_index;

  252.     int colorspace;

  253.     int_fast16_t *sample_buffer;

  254.     int gob_count;

  255.     int packed_at_lsb;

  256. 

  257.     int quant_table_count;

  258. 

  259.     DSPContext dsp;

  260. 

  261.     struct FFV1Context *slice_context[MAX_SLICES];

  262.     int slice_count;

  263.     int num_v_slices;

  264.     int num_h_slices;

  265.     int slice_width;

  266.     int slice_height;

  267.     int slice_x;

  268.     int slice_y;

  269. }FFV1Context;

  270. 

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

  272.     if(bits==8)

  273.         diff= (int8_t)diff;

  274.     else{

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

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

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

  278.     }

  279. 

  280.     return diff;

  281. }

  282. 

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

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

  285.     const int  T= last[ 0];

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

  287. 

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

  289. }

  290. 

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

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

  293.     const int  T= last[ 0];

  294.     const int RT= last[ 1];

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

  296. 

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

  298.         const int TT= last2[0];

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

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

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

  302.     }else

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

  304. }

  305. 

  306. static void find_best_state(uint8_t best_state[256][256], const uint8_t one_state[256]){

  307.     int i,j,k,m;

  308.     double l2tab[256];

  309. 

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

  311.         l2tab[i]= log2(i/256.0);

  312. 

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

  314.         double best_len[256];

  315.         double p= i/256.0;

  316. 

  317.         for(j=0; j<256; j++)

  318.             best_len[j]= 1<<30;

  319. 

  320.         for(j=FFMAX(i-10,1); j<FFMIN(i+11,256); j++){

  321.             double occ[256]={0};

  322.             double len=0;

  323.             occ[j]=1.0;

  324.             for(k=0; k<256; k++){

  325.                 double newocc[256]={0};

  326.                 for(m=0; m<256; m++){

  327.                     if(occ[m]){

  328.                         len -=occ[m]*(     p *l2tab[    m]

  329.                                       + (1-p)*l2tab[256-m]);

  330.                     }

  331.                 }

  332.                 if(len < best_len[k]){

  333.                     best_len[k]= len;

  334.                     best_state[i][k]= j;

  335.                 }

  336.                 for(m=0; m<256; m++){

  337.                     if(occ[m]){

  338.                         newocc[    one_state[    m]] += occ[m]*   p ;

  339.                         newocc[256-one_state[256-m]] += occ[m]*(1-p);

  340.                     }

  341.                 }

  342.                 memcpy(occ, newocc, sizeof(occ));

  343.             }

  344.         }

  345.     }

  346. }

  347. 

  348. static av_always_inline av_flatten void put_symbol_inline(RangeCoder *c, uint8_t *state, int v, int is_signed, uint64_t rc_stat[256][2], uint64_t rc_stat2[32][2]){

  349.     int i;

  350. 

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

  352. do{\

  353.     if(rc_stat){\

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

  355.         rc_stat2[(S)-state][B]++;\

  356.     }\

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

  358. }while(0)

  359. 

  360.     if(v){

  361.         const int a= FFABS(v);

  362.         const int e= av_log2(a);

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

  364.         if(e<=9){

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

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

  367.             }

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

  369. 

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

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

  372.             }

  373. 

  374.             if(is_signed)

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

  376.         }else{

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

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

  379.             }

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

  381. 

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

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

  384.             }

  385. 

  386.             if(is_signed)

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

  388.         }

  389.     }else{

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

  391.     }

  392. #undef put_rac

  393. }

  394. 

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

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

  397. }

  398. 

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

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

  401.         return 0;

  402.     else{

  403.         int i, e, a;

  404.         e= 0;

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

  406.             e++;

  407.         }

  408. 

  409.         a= 1;

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

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

  412.         }

  413. 

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

  415.         return (a^e)-e;

  416.     }

  417. }

  418. 

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

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

  421. }

  422. 

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

  424.     int drift= state->drift;

  425.     int count= state->count;

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

  427.     drift += v;

  428. 

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

  430.         count >>= 1;

  431.         drift >>= 1;

  432.         state->error_sum >>= 1;

  433.     }

  434.     count++;

  435. 

  436.     if(drift <= -count){

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

  438. 

  439.         drift += count;

  440.         if(drift <= -count)

  441.             drift= -count + 1;

  442.     }else if(drift > 0){

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

  444. 

  445.         drift -= count;

  446.         if(drift > 0)

  447.             drift= 0;

  448.     }

  449. 

  450.     state->drift= drift;

  451.     state->count= count;

  452. }

  453. 

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

  455.     int i, k, code;

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

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

  458. 

  459.     i= state->count;

  460.     k=0;

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

  462.         k++;

  463.         i += i;

  464.     }

  465. 

  466.     assert(k<=8);

  467. 

  468. #if 0 // JPEG LS

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

  470.     else                                         code= v;

  471. #else

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

  473. #endif

  474. 

  475. //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);

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

  477. 

  478.     update_vlc_state(state, v);

  479. }

  480. 

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

  482.     int k, i, v, ret;

  483. 

  484.     i= state->count;

  485.     k=0;

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

  487.         k++;

  488.         i += i;

  489.     }

  490. 

  491.     assert(k<=8);

  492. 

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

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

  495. 

  496. #if 0 // JPEG LS

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

  498. #else

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

  500. #endif

  501. 

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

  503. 

  504.     update_vlc_state(state, v);

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

  506.     return ret;

  507. }

  508. 

  509. #if CONFIG_FFV1_ENCODER

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

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

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

  513.     int x;

  514.     int run_index= s->run_index;

  515.     int run_count=0;

  516.     int run_mode=0;

  517. 

  518.     if(s->ac){

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

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

  521.             return -1;

  522.         }

  523.     }else{

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

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

  526.             return -1;

  527.         }

  528.     }

  529. 

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

  531.         int diff, context;

  532. 

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

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

  535. 

  536.         if(context < 0){

  537.             context = -context;

  538.             diff= -diff;

  539.         }

  540. 

  541.         diff= fold(diff, bits);

  542. 

  543.         if(s->ac){

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

  545.                 put_symbol_inline(c, p->state[context], diff, 1, s->rc_stat, s->rc_stat2[p->quant_table_index][context]);

  546.             }else{

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

  548.             }

  549.         }else{

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

  551. 

  552.             if(run_mode){

  553. 

  554.                 if(diff){

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

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

  557.                         run_index++;

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

  559.                     }

  560. 

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

  562.                     if(run_index) run_index--;

  563.                     run_count=0;

  564.                     run_mode=0;

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

  566.                 }else{

  567.                     run_count++;

  568.                 }

  569.             }

  570. 

  571. //            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));

  572. 

  573.             if(run_mode == 0)

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

  575.         }

  576.     }

  577.     if(run_mode){

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

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

  580.             run_index++;

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

  582.         }

  583. 

  584.         if(run_count)

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

  586.     }

  587.     s->run_index= run_index;

  588. 

  589.     return 0;

  590. }

  591. 

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

  593.     int x,y,i;

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

  595.     int_fast16_t *sample[3];

  596.     s->run_index=0;

  597. 

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

  599. 

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

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

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

  603. 

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

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

  606. //{START_TIMER

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

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

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

  610.             }

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

  612.         }else{

  613.             if(s->packed_at_lsb){

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

  615.                     sample[0][x]= ((uint16_t*)(src + stride*y))[x];

  616.                 }

  617.             }else{

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

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

  620.                 }

  621.             }

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

  623.         }

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

  625.     }

  626. }

  627. 

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

  629.     int x, y, p, i;

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

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

  632.     s->run_index=0;

  633. 

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

  635. 

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

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

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

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

  640. 

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

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

  643.             int b= v&0xFF;

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

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

  646. 

  647.             b -= g;

  648.             r -= g;

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

  650.             b += 0x100;

  651.             r += 0x100;

  652. 

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

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

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

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

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

  658.         }

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

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

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

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

  663.         }

  664.     }

  665. }

  666. 

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

  668.     int last=0;

  669.     int i;

  670.     uint8_t state[CONTEXT_SIZE];

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

  672. 

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

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

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

  676.             last= i;

  677.         }

  678.     }

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

  680. }

  681. 

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

  683.     int i;

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

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

  686. }

  687. 

  688. static void write_header(FFV1Context *f){

  689.     uint8_t state[CONTEXT_SIZE];

  690.     int i, j;

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

  692. 

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

  694. 

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

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

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

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

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

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

  701.             }

  702.         }

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

  704.         if(f->version>0)

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

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

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

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

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

  710. 

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

  712.     }else{

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

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

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

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

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

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

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

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

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

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

  723.             }

  724.         }

  725.     }

  726. }

  727. #endif /* CONFIG_FFV1_ENCODER */

  728. 

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

  730.     FFV1Context *s = avctx->priv_data;

  731. 

  732.     s->avctx= avctx;

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

  734. 

  735.     avcodec_get_frame_defaults(&s->picture);

  736. 

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

  738. 

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

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

  741. 

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

  743.     //defaults

  744.     s->num_h_slices=1;

  745.     s->num_v_slices=1;

  746. 

  747. 

  748.     return 0;

  749. }

  750. 

  751. static int init_slice_state(FFV1Context *f){

  752.     int i, j;

  753. 

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

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

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

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

  758. 

  759.             if(fs->ac){

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

  761.                 if(!p->    state)

  762.                     return AVERROR(ENOMEM);

  763.             }else{

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

  765.                 if(!p->vlc_state)

  766.                     return AVERROR(ENOMEM);

  767.             }

  768.         }

  769. 

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

  771.             //FIXME only redo if state_transition changed

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

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

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

  775.             }

  776.         }

  777.     }

  778. 

  779.     return 0;

  780. }

  781. 

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

  783.     int i;

  784. 

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

  786. 

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

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

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

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

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

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

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

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

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

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

  797.         memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));

  798. 

  799.         fs->slice_width = sxe - sxs;

  800.         fs->slice_height= sye - sys;

  801.         fs->slice_x     = sxs;

  802.         fs->slice_y     = sys;

  803. 

  804.         fs->sample_buffer = av_malloc(9 * (fs->width+6) * sizeof(*fs->sample_buffer));

  805.         if (!fs->sample_buffer)

  806.             return AVERROR(ENOMEM);

  807.     }

  808.     return 0;

  809. }

  810. 

  811. static int allocate_initial_states(FFV1Context *f){

  812.     int i;

  813. 

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

  815.         f->initial_states[i]= av_malloc(f->context_count[i]*sizeof(*f->initial_states[i]));

  816.         if(!f->initial_states[i])

  817.             return AVERROR(ENOMEM);

  818.         memset(f->initial_states[i], 128, f->context_count[i]*sizeof(*f->initial_states[i]));

  819.     }

  820.     return 0;

  821. }

  822. 

  823. #if CONFIG_FFV1_ENCODER

  824. static int write_extra_header(FFV1Context *f){

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

  826.     uint8_t state[CONTEXT_SIZE];

  827.     int i, j, k;

  828.     uint8_t state2[32][CONTEXT_SIZE];

  829. 

  830.     memset(state2, 128, sizeof(state2));

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

  832. 

  833.     f->avctx->extradata= av_malloc(f->avctx->extradata_size= 10000 + (11*11*5*5*5+11*11*11)*32);

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

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

  836. 

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

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

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

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

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

  842.         }

  843.     }

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

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

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

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

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

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

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

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

  852. 

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

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

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

  856. 

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

  858.         for(j=0; j<f->context_count[i]*CONTEXT_SIZE; j++)

  859.             if(f->initial_states[i] && f->initial_states[i][0][j] != 128)

  860.                 break;

  861.         if(j<f->context_count[i]*CONTEXT_SIZE){

  862.             put_rac(c, state, 1);

  863.             for(j=0; j<f->context_count[i]; j++){

  864.                 for(k=0; k<CONTEXT_SIZE; k++){

  865.                     int pred= j ? f->initial_states[i][j-1][k] : 128;

  866.                     put_symbol(c, state2[k], (int8_t)(f->initial_states[i][j][k]-pred), 1);

  867.                 }

  868.             }

  869.         }else{

  870.             put_rac(c, state, 0);

  871.         }

  872.     }

  873. 

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

  875. 

  876.     return 0;

  877. }

  878. 

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

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

  881. 

  882.     do{

  883.         changed=0;

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

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

  886. #define COST(old, new) \

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

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

  889. 

  890. #define COST2(old, new) \

  891.     COST(old, new)\

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

  893. 

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

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

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

  897.                     int j;

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

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

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

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

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

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

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

  905.                     }

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

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

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

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

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

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

  912.                         }

  913.                     }

  914.                     print=changed=1;

  915.                 }

  916.             }

  917.         }

  918.     }while(changed);

  919.     return print;

  920. }

  921. 

  922. static av_cold int encode_init(AVCodecContext *avctx)

  923. {

  924.     FFV1Context *s = avctx->priv_data;

  925.     int i, j, k, m;

  926. 

  927.     common_init(avctx);

  928. 

  929.     s->version=0;

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

  931. 

  932.     if(s->ac>1)

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

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

  935. 

  936.     s->plane_count=2;

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

  938.         s->quant_table_count=2;

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

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

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

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

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

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

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

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

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

  948.         }else{

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

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

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

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

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

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

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

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

  957.         }

  958.     }

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

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

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

  962. 

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

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

  965. 

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

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

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

  969.     }

  970. 

  971.     if(allocate_initial_states(s) < 0)

  972.         return AVERROR(ENOMEM);

  973. 

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

  975.     switch(avctx->pix_fmt){

  976.     case PIX_FMT_YUV420P10:

  977.     case PIX_FMT_YUV422P10:

  978.         s->packed_at_lsb = 1;

  979.     case PIX_FMT_YUV444P16:

  980.     case PIX_FMT_YUV422P16:

  981.     case PIX_FMT_YUV420P16:

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

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

  984.             return -1;

  985.         }

  986.         if(!s->ac){

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

  988.             return -1;

  989.         }

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

  991.     case PIX_FMT_YUV444P:

  992.     case PIX_FMT_YUV422P:

  993.     case PIX_FMT_YUV420P:

  994.     case PIX_FMT_YUV411P:

  995.     case PIX_FMT_YUV410P:

  996.         s->colorspace= 0;

  997.         break;

  998.     case PIX_FMT_RGB32:

  999.         s->colorspace= 1;

  1000.         break;

  1001.     default:

  1002.         av_log(avctx, AV_LOG_ERROR, "format not supported\n");

  1003.         return -1;

  1004.     }

  1005.     avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift, &s->chroma_v_shift);

  1006. 

  1007.     s->picture_number=0;

  1008. 

  1009.     if(avctx->flags & (CODEC_FLAG_PASS1|CODEC_FLAG_PASS2)){

  1010.         for(i=0; i<s->quant_table_count; i++){

  1011.             s->rc_stat2[i]= av_mallocz(s->context_count[i]*sizeof(*s->rc_stat2[i]));

  1012.             if(!s->rc_stat2[i])

  1013.                 return AVERROR(ENOMEM);

  1014.         }

  1015.     }

  1016.     if(avctx->stats_in){

  1017.         char *p= avctx->stats_in;

  1018.         uint8_t best_state[256][256];

  1019.         int gob_count=0;

  1020.         char *next;

  1021. 

  1022.         av_assert0(s->version>=2);

  1023. 

  1024.         for(;;){

  1025.             for(j=0; j<256; j++){

  1026.                 for(i=0; i<2; i++){

  1027.                     s->rc_stat[j][i]= strtol(p, &next, 0);

  1028.                     if(next==p){

  1029.                         av_log(avctx, AV_LOG_ERROR, "2Pass file invalid at %d %d [%s]\n", j,i,p);

  1030.                         return -1;

  1031.                     }

  1032.                     p=next;

  1033.                 }

  1034.             }

  1035.             for(i=0; i<s->quant_table_count; i++){

  1036.                 for(j=0; j<s->context_count[i]; j++){

  1037.                     for(k=0; k<32; k++){

  1038.                         for(m=0; m<2; m++){

  1039.                             s->rc_stat2[i][j][k][m]= strtol(p, &next, 0);

  1040.                             if(next==p){

  1041.                                 av_log(avctx, AV_LOG_ERROR, "2Pass file invalid at %d %d %d %d [%s]\n", i,j,k,m,p);

  1042.                                 return -1;

  1043.                             }

  1044.                             p=next;

  1045.                         }

  1046.                     }

  1047.                 }

  1048.             }

  1049.             gob_count= strtol(p, &next, 0);

  1050.             if(next==p || gob_count <0){

  1051.                 av_log(avctx, AV_LOG_ERROR, "2Pass file invalid\n");

  1052.                 return -1;

  1053.             }

  1054.             p=next;

  1055.             while(*p=='\n' || *p==' ') p++;

  1056.             if(p[0]==0) break;

  1057.         }

  1058.         sort_stt(s, s->state_transition);

  1059. 

  1060.         find_best_state(best_state, s->state_transition);

  1061. 

  1062.         for(i=0; i<s->quant_table_count; i++){

  1063.             for(j=0; j<s->context_count[i]; j++){

  1064.                 for(k=0; k<32; k++){

  1065.                     double p= 128;

  1066.                     if(s->rc_stat2[i][j][k][0]+s->rc_stat2[i][j][k][1]){

  1067.                         p=256.0*s->rc_stat2[i][j][k][1] / (s->rc_stat2[i][j][k][0]+s->rc_stat2[i][j][k][1]);

  1068.                     }

  1069.                     s->initial_states[i][j][k]= best_state[av_clip(round(p), 1, 255)][av_clip((s->rc_stat2[i][j][k][0]+s->rc_stat2[i][j][k][1])/gob_count, 0, 255)];

  1070.                 }

  1071.             }

  1072.         }

  1073.     }

  1074. 

  1075.     if(s->version>1){

  1076.         s->num_h_slices=2;

  1077.         s->num_v_slices=2;

  1078.         write_extra_header(s);

  1079.     }

  1080. 

  1081.     if(init_slice_contexts(s) < 0)

  1082.         return -1;

  1083.     if(init_slice_state(s) < 0)

  1084.         return -1;

  1085. 

  1086. #define STATS_OUT_SIZE 1024*1024*6

  1087.     if(avctx->flags & CODEC_FLAG_PASS1){

  1088.         avctx->stats_out= av_mallocz(STATS_OUT_SIZE);

  1089.         for(i=0; i<s->quant_table_count; i++){

  1090.             for(j=0; j<s->slice_count; j++){

  1091.                 FFV1Context *sf= s->slice_context[j];

  1092.                 av_assert0(!sf->rc_stat2[i]);

  1093.                 sf->rc_stat2[i]= av_mallocz(s->context_count[i]*sizeof(*sf->rc_stat2[i]));

  1094.                 if(!sf->rc_stat2[i])

  1095.                     return AVERROR(ENOMEM);

  1096.             }

  1097.         }

  1098.     }

  1099. 

  1100.     return 0;

  1101. }

  1102. #endif /* CONFIG_FFV1_ENCODER */

  1103. 

  1104. 

  1105. static void clear_state(FFV1Context *f){

  1106.     int i, si, j;

  1107. 

  1108.     for(si=0; si<f->slice_count; si++){

  1109.         FFV1Context *fs= f->slice_context[si];

  1110.         for(i=0; i<f->plane_count; i++){

  1111.             PlaneContext *p= &fs->plane[i];

  1112. 

  1113.             p->interlace_bit_state[0]= 128;

  1114.             p->interlace_bit_state[1]= 128;

  1115. 

  1116.             if(fs->ac){

  1117.                 if(f->initial_states[p->quant_table_index]){

  1118.                     memcpy(p->state, f->initial_states[p->quant_table_index], CONTEXT_SIZE*p->context_count);

  1119.                 }else

  1120.                 memset(p->state, 128, CONTEXT_SIZE*p->context_count);

  1121.             }else{

  1122.             for(j=0; j<p->context_count; j++){

  1123.                     p->vlc_state[j].drift= 0;

  1124.                     p->vlc_state[j].error_sum= 4; //FFMAX((RANGE + 32)/64, 2);

  1125.                     p->vlc_state[j].bias= 0;

  1126.                     p->vlc_state[j].count= 1;

  1127.             }

  1128.             }

  1129.         }

  1130.     }

  1131. }

  1132. 

  1133. #if CONFIG_FFV1_ENCODER

  1134. static int encode_slice(AVCodecContext *c, void *arg){

  1135.     FFV1Context *fs= *(void**)arg;

  1136.     FFV1Context *f= fs->avctx->priv_data;

  1137.     int width = fs->slice_width;

  1138.     int height= fs->slice_height;

  1139.     int x= fs->slice_x;

  1140.     int y= fs->slice_y;

  1141.     AVFrame * const p= &f->picture;

  1142. 

  1143.     if(f->colorspace==0){

  1144.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1145.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1146.         const int cx= x>>f->chroma_h_shift;

  1147.         const int cy= y>>f->chroma_v_shift;

  1148. 

  1149.         encode_plane(fs, p->data[0] + x + y*p->linesize[0], width, height, p->linesize[0], 0);

  1150. 

  1151.         encode_plane(fs, p->data[1] + cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  1152.         encode_plane(fs, p->data[2] + cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);

  1153.     }else{

  1154.         encode_rgb_frame(fs, (uint32_t*)(p->data[0]) + x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1155.     }

  1156.     emms_c();

  1157. 

  1158.     return 0;

  1159. }

  1160. 

  1161. static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

  1162.     FFV1Context *f = avctx->priv_data;

  1163.     RangeCoder * const c= &f->slice_context[0]->c;

  1164.     AVFrame *pict = data;

  1165.     AVFrame * const p= &f->picture;

  1166.     int used_count= 0;

  1167.     uint8_t keystate=128;

  1168.     uint8_t *buf_p;

  1169.     int i;

  1170. 

  1171.     ff_init_range_encoder(c, buf, buf_size);

  1172.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1173. 

  1174.     *p = *pict;

  1175.     p->pict_type= AV_PICTURE_TYPE_I;

  1176. 

  1177.     if(avctx->gop_size==0 || f->picture_number % avctx->gop_size == 0){

  1178.         put_rac(c, &keystate, 1);

  1179.         p->key_frame= 1;

  1180.         f->gob_count++;

  1181.         write_header(f);

  1182.         clear_state(f);

  1183.     }else{

  1184.         put_rac(c, &keystate, 0);

  1185.         p->key_frame= 0;

  1186.     }

  1187. 

  1188.     if(!f->ac){

  1189.         used_count += ff_rac_terminate(c);

  1190. //printf("pos=%d\n", used_count);

  1191.         init_put_bits(&f->slice_context[0]->pb, buf + used_count, buf_size - used_count);

  1192.     }else if (f->ac>1){

  1193.         int i;

  1194.         for(i=1; i<256; i++){

  1195.             c->one_state[i]= f->state_transition[i];

  1196.             c->zero_state[256-i]= 256-c->one_state[i];

  1197.         }

  1198.     }

  1199. 

  1200.     for(i=1; i<f->slice_count; i++){

  1201.         FFV1Context *fs= f->slice_context[i];

  1202.         uint8_t *start= buf + (buf_size-used_count)*i/f->slice_count;

  1203.         int len= buf_size/f->slice_count;

  1204. 

  1205.         if(fs->ac){

  1206.             ff_init_range_encoder(&fs->c, start, len);

  1207.         }else{

  1208.             init_put_bits(&fs->pb, start, len);

  1209.         }

  1210.     }

  1211.     avctx->execute(avctx, encode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1212. 

  1213.     buf_p=buf;

  1214.     for(i=0; i<f->slice_count; i++){

  1215.         FFV1Context *fs= f->slice_context[i];

  1216.         int bytes;

  1217. 

  1218.         if(fs->ac){

  1219.             uint8_t state=128;

  1220.             put_rac(&fs->c, &state, 0);

  1221.             bytes= ff_rac_terminate(&fs->c);

  1222.         }else{

  1223.             flush_put_bits(&fs->pb); //nicer padding FIXME

  1224.             bytes= used_count + (put_bits_count(&fs->pb)+7)/8;

  1225.             used_count= 0;

  1226.         }

  1227.         if(i>0){

  1228.             av_assert0(bytes < buf_size/f->slice_count);

  1229.             memmove(buf_p, fs->ac ? fs->c.bytestream_start : fs->pb.buf, bytes);

  1230.             av_assert0(bytes < (1<<24));

  1231.             AV_WB24(buf_p+bytes, bytes);

  1232.             bytes+=3;

  1233.         }

  1234.         buf_p += bytes;

  1235.     }

  1236. 

  1237.     if((avctx->flags&CODEC_FLAG_PASS1) && (f->picture_number&31)==0){

  1238.         int j, k, m;

  1239.         char *p= avctx->stats_out;

  1240.         char *end= p + STATS_OUT_SIZE;

  1241. 

  1242.         memset(f->rc_stat, 0, sizeof(f->rc_stat));

  1243.         for(i=0; i<f->quant_table_count; i++)

  1244.             memset(f->rc_stat2[i], 0, f->context_count[i]*sizeof(*f->rc_stat2[i]));

  1245. 

  1246.         for(j=0; j<f->slice_count; j++){

  1247.             FFV1Context *fs= f->slice_context[j];

  1248.             for(i=0; i<256; i++){

  1249.                 f->rc_stat[i][0] += fs->rc_stat[i][0];

  1250.                 f->rc_stat[i][1] += fs->rc_stat[i][1];

  1251.             }

  1252.             for(i=0; i<f->quant_table_count; i++){

  1253.                 for(k=0; k<f->context_count[i]; k++){

  1254.                     for(m=0; m<32; m++){

  1255.                         f->rc_stat2[i][k][m][0] += fs->rc_stat2[i][k][m][0];

  1256.                         f->rc_stat2[i][k][m][1] += fs->rc_stat2[i][k][m][1];

  1257.                     }

  1258.                 }

  1259.             }

  1260.         }

  1261. 

  1262.         for(j=0; j<256; j++){

  1263.             snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat[j][0], f->rc_stat[j][1]);

  1264.             p+= strlen(p);

  1265.         }

  1266.         snprintf(p, end-p, "\n");

  1267. 

  1268.         for(i=0; i<f->quant_table_count; i++){

  1269.             for(j=0; j<f->context_count[i]; j++){

  1270.                 for(m=0; m<32; m++){

  1271.                     snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat2[i][j][m][0], f->rc_stat2[i][j][m][1]);

  1272.                     p+= strlen(p);

  1273.                 }

  1274.             }

  1275.         }

  1276.         snprintf(p, end-p, "%d\n", f->gob_count);

  1277.     } else if(avctx->flags&CODEC_FLAG_PASS1)

  1278.         avctx->stats_out[0] = '\0';

  1279. 

  1280.     f->picture_number++;

  1281.     return buf_p-buf;

  1282. }

  1283. #endif /* CONFIG_FFV1_ENCODER */

  1284. 

  1285. static av_cold int common_end(AVCodecContext *avctx){

  1286.     FFV1Context *s = avctx->priv_data;

  1287.     int i, j;

  1288. 

  1289.     if (avctx->codec->decode && s->picture.data[0])

  1290.         avctx->release_buffer(avctx, &s->picture);

  1291. 

  1292.     for(j=0; j<s->slice_count; j++){

  1293.         FFV1Context *fs= s->slice_context[j];

  1294.         for(i=0; i<s->plane_count; i++){

  1295.             PlaneContext *p= &fs->plane[i];

  1296. 

  1297.             av_freep(&p->state);

  1298.             av_freep(&p->vlc_state);

  1299.         }

  1300.         av_freep(&fs->sample_buffer);

  1301.     }

  1302. 

  1303.     av_freep(&avctx->stats_out);

  1304.     for(j=0; j<s->quant_table_count; j++){

  1305.         av_freep(&s->initial_states[j]);

  1306.         for(i=0; i<s->slice_count; i++){

  1307.             FFV1Context *sf= s->slice_context[i];

  1308.             av_freep(&sf->rc_stat2[j]);

  1309.         }

  1310.         av_freep(&s->rc_stat2[j]);

  1311.     }

  1312. 

  1313.     for(i=0; i<s->slice_count; i++){

  1314.         av_freep(&s->slice_context[i]);

  1315.     }

  1316. 

  1317.     return 0;

  1318. }

  1319. 

  1320. static av_always_inline void decode_line(FFV1Context *s, int w, int_fast16_t *sample[2], int plane_index, int bits){

  1321.     PlaneContext * const p= &s->plane[plane_index];

  1322.     RangeCoder * const c= &s->c;

  1323.     int x;

  1324.     int run_count=0;

  1325.     int run_mode=0;

  1326.     int run_index= s->run_index;

  1327. 

  1328.     for(x=0; x<w; x++){

  1329.         int diff, context, sign;

  1330. 

  1331.         context= get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);

  1332.         if(context < 0){

  1333.             context= -context;

  1334.             sign=1;

  1335.         }else

  1336.             sign=0;

  1337. 

  1338.         av_assert2(context < p->context_count);

  1339. 

  1340.         if(s->ac){

  1341.             diff= get_symbol_inline(c, p->state[context], 1);

  1342.         }else{

  1343.             if(context == 0 && run_mode==0) run_mode=1;

  1344. 

  1345.             if(run_mode){

  1346.                 if(run_count==0 && run_mode==1){

  1347.                     if(get_bits1(&s->gb)){

  1348.                         run_count = 1<<ff_log2_run[run_index];

  1349.                         if(x + run_count <= w) run_index++;

  1350.                     }else{

  1351.                         if(ff_log2_run[run_index]) run_count = get_bits(&s->gb, ff_log2_run[run_index]);

  1352.                         else run_count=0;

  1353.                         if(run_index) run_index--;

  1354.                         run_mode=2;

  1355.                     }

  1356.                 }

  1357.                 run_count--;

  1358.                 if(run_count < 0){

  1359.                     run_mode=0;

  1360.                     run_count=0;

  1361.                     diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1362.                     if(diff>=0) diff++;

  1363.                 }else

  1364.                     diff=0;

  1365.             }else

  1366.                 diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1367. 

  1368. //            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));

  1369.         }

  1370. 

  1371.         if(sign) diff= -diff;

  1372. 

  1373.         sample[1][x]= (predict(sample[1] + x, sample[0] + x) + diff) & ((1<<bits)-1);

  1374.     }

  1375.     s->run_index= run_index;

  1376. }

  1377. 

  1378. static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){

  1379.     int x, y;

  1380.     int_fast16_t *sample[2];

  1381.     sample[0]=s->sample_buffer    +3;

  1382.     sample[1]=s->sample_buffer+w+6+3;

  1383. 

  1384.     s->run_index=0;

  1385. 

  1386.     memset(s->sample_buffer, 0, 2*(w+6)*sizeof(*s->sample_buffer));

  1387. 

  1388.     for(y=0; y<h; y++){

  1389.         int_fast16_t *temp= sample[0]; //FIXME try a normal buffer

  1390. 

  1391.         sample[0]= sample[1];

  1392.         sample[1]= temp;

  1393. 

  1394.         sample[1][-1]= sample[0][0  ];

  1395.         sample[0][ w]= sample[0][w-1];

  1396. 

  1397. //{START_TIMER

  1398.         if(s->avctx->bits_per_raw_sample <= 8){

  1399.             decode_line(s, w, sample, plane_index, 8);

  1400.             for(x=0; x<w; x++){

  1401.                 src[x + stride*y]= sample[1][x];

  1402.             }

  1403.         }else{

  1404.             decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

  1405.             for(x=0; x<w; x++){

  1406.                 ((uint16_t*)(src + stride*y))[x]= sample[1][x] << (16 - s->avctx->bits_per_raw_sample);

  1407.             }

  1408.         }

  1409. //STOP_TIMER("decode-line")}

  1410.     }

  1411. }

  1412. 

  1413. static void decode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){

  1414.     int x, y, p;

  1415.     int_fast16_t *sample[3][2];

  1416.     for(x=0; x<3; x++){

  1417.         sample[x][0] = s->sample_buffer +  x*2   *(w+6) + 3;

  1418.         sample[x][1] = s->sample_buffer + (x*2+1)*(w+6) + 3;

  1419.     }

  1420. 

  1421.     s->run_index=0;

  1422. 

  1423.     memset(s->sample_buffer, 0, 6*(w+6)*sizeof(*s->sample_buffer));

  1424. 

  1425.     for(y=0; y<h; y++){

  1426.         for(p=0; p<3; p++){

  1427.             int_fast16_t *temp= sample[p][0]; //FIXME try a normal buffer

  1428. 

  1429.             sample[p][0]= sample[p][1];

  1430.             sample[p][1]= temp;

  1431. 

  1432.             sample[p][1][-1]= sample[p][0][0  ];

  1433.             sample[p][0][ w]= sample[p][0][w-1];

  1434.             decode_line(s, w, sample[p], FFMIN(p, 1), 9);

  1435.         }

  1436.         for(x=0; x<w; x++){

  1437.             int g= sample[0][1][x];

  1438.             int b= sample[1][1][x];

  1439.             int r= sample[2][1][x];

  1440. 

  1441. //            assert(g>=0 && b>=0 && r>=0);

  1442. //            assert(g<256 && b<512 && r<512);

  1443. 

  1444.             b -= 0x100;

  1445.             r -= 0x100;

  1446.             g -= (b + r)>>2;

  1447.             b += g;

  1448.             r += g;

  1449. 

  1450.             src[x + stride*y]= b + (g<<8) + (r<<16) + (0xFF<<24);

  1451.         }

  1452.     }

  1453. }

  1454. 

  1455. static int decode_slice(AVCodecContext *c, void *arg){

  1456.     FFV1Context *fs= *(void**)arg;

  1457.     FFV1Context *f= fs->avctx->priv_data;

  1458.     int width = fs->slice_width;

  1459.     int height= fs->slice_height;

  1460.     int x= fs->slice_x;

  1461.     int y= fs->slice_y;

  1462.     AVFrame * const p= &f->picture;

  1463. 

  1464.     av_assert1(width && height);

  1465.     if(f->colorspace==0){

  1466.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1467.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1468.         const int cx= x>>f->chroma_h_shift;

  1469.         const int cy= y>>f->chroma_v_shift;

  1470.         decode_plane(fs, p->data[0] + x + y*p->linesize[0], width, height, p->linesize[0], 0);

  1471. 

  1472.         decode_plane(fs, p->data[1] + cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  1473.         decode_plane(fs, p->data[2] + cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[2], 1);

  1474.     }else{

  1475.         decode_rgb_frame(fs, (uint32_t*)p->data[0] + x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1476.     }

  1477. 

  1478.     emms_c();

  1479. 

  1480.     return 0;

  1481. }

  1482. 

  1483. static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale){

  1484.     int v;

  1485.     int i=0;

  1486.     uint8_t state[CONTEXT_SIZE];

  1487. 

  1488.     memset(state, 128, sizeof(state));

  1489. 

  1490.     for(v=0; i<128 ; v++){

  1491.         int len= get_symbol(c, state, 0) + 1;

  1492. 

  1493.         if(len + i > 128) return -1;

  1494. 

  1495.         while(len--){

  1496.             quant_table[i] = scale*v;

  1497.             i++;

  1498. //printf("%2d ",v);

  1499. //if(i%16==0) printf("\n");

  1500.         }

  1501.     }

  1502. 

  1503.     for(i=1; i<128; i++){

  1504.         quant_table[256-i]= -quant_table[i];

  1505.     }

  1506.     quant_table[128]= -quant_table[127];

  1507. 

  1508.     return 2*v - 1;

  1509. }

  1510. 

  1511. static int read_quant_tables(RangeCoder *c, int16_t quant_table[MAX_CONTEXT_INPUTS][256]){

  1512.     int i;

  1513.     int context_count=1;

  1514. 

  1515.     for(i=0; i<5; i++){

  1516.         context_count*= read_quant_table(c, quant_table[i], context_count);

  1517.         if(context_count > 32768U){

  1518.             return -1;

  1519.         }

  1520.     }

  1521.     return (context_count+1)/2;

  1522. }

  1523. 

  1524. static int read_extra_header(FFV1Context *f){

  1525.     RangeCoder * const c= &f->c;

  1526.     uint8_t state[CONTEXT_SIZE];

  1527.     int i, j, k;

  1528.     uint8_t state2[32][CONTEXT_SIZE];

  1529. 

  1530.     memset(state2, 128, sizeof(state2));

  1531.     memset(state, 128, sizeof(state));

  1532. 

  1533.     ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);

  1534.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1535. 

  1536.     f->version= get_symbol(c, state, 0);

  1537.     f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1538.     if(f->ac>1){

  1539.         for(i=1; i<256; i++){

  1540.             f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1541.         }

  1542.     }

  1543.     f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1544.     f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1545.     get_rac(c, state); //no chroma = false

  1546.     f->chroma_h_shift= get_symbol(c, state, 0);

  1547.     f->chroma_v_shift= get_symbol(c, state, 0);

  1548.     get_rac(c, state); //transparency plane

  1549.     f->plane_count= 2;

  1550.     f->num_h_slices= 1 + get_symbol(c, state, 0);

  1551.     f->num_v_slices= 1 + get_symbol(c, state, 0);

  1552.     if(f->num_h_slices > (unsigned)f->width || f->num_v_slices > (unsigned)f->height){

  1553.         av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");

  1554.         return -1;

  1555.     }

  1556. 

  1557.     f->quant_table_count= get_symbol(c, state, 0);

  1558.     if(f->quant_table_count > (unsigned)MAX_QUANT_TABLES)

  1559.         return -1;

  1560.     for(i=0; i<f->quant_table_count; i++){

  1561.         if((f->context_count[i]= read_quant_tables(c, f->quant_tables[i])) < 0){

  1562.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1563.             return -1;

  1564.         }

  1565.     }

  1566. 

  1567.     if(allocate_initial_states(f) < 0)

  1568.         return AVERROR(ENOMEM);

  1569. 

  1570.     for(i=0; i<f->quant_table_count; i++){

  1571.         if(get_rac(c, state)){

  1572.             for(j=0; j<f->context_count[i]; j++){

  1573.                 for(k=0; k<CONTEXT_SIZE; k++){

  1574.                     int pred= j ? f->initial_states[i][j-1][k] : 128;

  1575.                     f->initial_states[i][j][k]= (pred+get_symbol(c, state2[k], 1))&0xFF;

  1576.                 }

  1577.             }

  1578.         }

  1579.     }

  1580. 

  1581.     return 0;

  1582. }

  1583. 

  1584. static int read_header(FFV1Context *f){

  1585.     uint8_t state[CONTEXT_SIZE];

  1586.     int i, j, context_count;

  1587.     RangeCoder * const c= &f->slice_context[0]->c;

  1588. 

  1589.     memset(state, 128, sizeof(state));

  1590. 

  1591.     if(f->version < 2){

  1592.         f->version= get_symbol(c, state, 0);

  1593.         f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1594.         if(f->ac>1){

  1595.             for(i=1; i<256; i++){

  1596.                 f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1597.             }

  1598.         }

  1599.         f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1600.         if(f->version>0)

  1601.             f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1602.         get_rac(c, state); //no chroma = false

  1603.         f->chroma_h_shift= get_symbol(c, state, 0);

  1604.         f->chroma_v_shift= get_symbol(c, state, 0);

  1605.         get_rac(c, state); //transparency plane

  1606.         f->plane_count= 2;

  1607.     }

  1608. 

  1609.     if(f->colorspace==0){

  1610.         if(f->avctx->bits_per_raw_sample<=8){

  1611.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1612.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;

  1613.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;

  1614.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;

  1615.             case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;

  1616.             case 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  1617.             default:

  1618.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1619.                 return -1;

  1620.             }

  1621.         }else{

  1622.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1623.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1624.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  1625.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P16; break;

  1626.             default:

  1627.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1628.                 return -1;

  1629.             }

  1630.         }

  1631.     }else if(f->colorspace==1){

  1632.         if(f->chroma_h_shift || f->chroma_v_shift){

  1633.             av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");

  1634.             return -1;

  1635.         }

  1636.         f->avctx->pix_fmt= PIX_FMT_RGB32;

  1637.     }else{

  1638.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  1639.         return -1;

  1640.     }

  1641. 

  1642. //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

  1643.     if(f->version < 2){

  1644.         context_count= read_quant_tables(c, f->quant_table);

  1645.         if(context_count < 0){

  1646.                 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1647.                 return -1;

  1648.         }

  1649.     }else{

  1650.         f->slice_count= get_symbol(c, state, 0);

  1651.         if(f->slice_count > (unsigned)MAX_SLICES)

  1652.             return -1;

  1653.     }

  1654. 

  1655.     for(j=0; j<f->slice_count; j++){

  1656.         FFV1Context *fs= f->slice_context[j];

  1657.         fs->ac= f->ac;

  1658. 

  1659.         if(f->version >= 2){

  1660.             fs->slice_x     = get_symbol(c, state, 0)   *f->width ;

  1661.             fs->slice_y     = get_symbol(c, state, 0)   *f->height;

  1662.             fs->slice_width =(get_symbol(c, state, 0)+1)*f->width  + fs->slice_x;

  1663.             fs->slice_height=(get_symbol(c, state, 0)+1)*f->height + fs->slice_y;

  1664. 

  1665.             fs->slice_x /= f->num_h_slices;

  1666.             fs->slice_y /= f->num_v_slices;

  1667.             fs->slice_width  = fs->slice_width /f->num_h_slices - fs->slice_x;

  1668.             fs->slice_height = fs->slice_height/f->num_v_slices - fs->slice_y;

  1669.             if((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height)

  1670.                 return -1;

  1671.             if(    (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width

  1672.                 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

  1673.                 return -1;

  1674.         }

  1675. 

  1676.         for(i=0; i<f->plane_count; i++){

  1677.             PlaneContext * const p= &fs->plane[i];

  1678. 

  1679.             if(f->version >= 2){

  1680.                 int idx=get_symbol(c, state, 0);

  1681.                 if(idx > (unsigned)f->quant_table_count){

  1682.                     av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");

  1683.                     return -1;

  1684.                 }

  1685.                 p->quant_table_index= idx;

  1686.                 memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));

  1687.                 context_count= f->context_count[idx];

  1688.             }else{

  1689.                 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));

  1690.             }

  1691. 

  1692.             if(p->context_count < context_count){

  1693.                 av_freep(&p->state);

  1694.                 av_freep(&p->vlc_state);

  1695.             }

  1696.             p->context_count= context_count;

  1697.         }

  1698.     }

  1699. 

  1700.     return 0;

  1701. }

  1702. 

  1703. static av_cold int decode_init(AVCodecContext *avctx)

  1704. {

  1705.     FFV1Context *f = avctx->priv_data;

  1706. 

  1707.     common_init(avctx);

  1708. 

  1709.     if(avctx->extradata && read_extra_header(f) < 0)

  1710.         return -1;

  1711. 

  1712.     if(init_slice_contexts(f) < 0)

  1713.         return -1;

  1714. 

  1715.     return 0;

  1716. }

  1717. 

  1718. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  1719.     const uint8_t *buf = avpkt->data;

  1720.     int buf_size = avpkt->size;

  1721.     FFV1Context *f = avctx->priv_data;

  1722.     RangeCoder * const c= &f->slice_context[0]->c;

  1723.     AVFrame * const p= &f->picture;

  1724.     int bytes_read, i;

  1725.     uint8_t keystate= 128;

  1726.     const uint8_t *buf_p;

  1727. 

  1728.     AVFrame *picture = data;

  1729. 

  1730.     /* release previously stored data */

  1731.     if (p->data[0])

  1732.         avctx->release_buffer(avctx, p);

  1733. 

  1734.     ff_init_range_decoder(c, buf, buf_size);

  1735.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1736. 

  1737. 

  1738.     p->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P

  1739.     if(get_rac(c, &keystate)){

  1740.         p->key_frame= 1;

  1741.         if(read_header(f) < 0)

  1742.             return -1;

  1743.         if(init_slice_state(f) < 0)

  1744.             return -1;

  1745. 

  1746.         clear_state(f);

  1747.     }else{

  1748.         p->key_frame= 0;

  1749.     }

  1750.     if(f->ac>1){

  1751.         int i;

  1752.         for(i=1; i<256; i++){

  1753.             c->one_state[i]= f->state_transition[i];

  1754.             c->zero_state[256-i]= 256-c->one_state[i];

  1755.         }

  1756.     }

  1757. 

  1758.     p->reference= 0;

  1759.     if(avctx->get_buffer(avctx, p) < 0){

  1760.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1761.         return -1;

  1762.     }

  1763. 

  1764.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  1765.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  1766. 

  1767.     if(!f->ac){

  1768.         bytes_read = c->bytestream - c->bytestream_start - 1;

  1769.         if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME

  1770. //printf("pos=%d\n", bytes_read);

  1771.         init_get_bits(&f->slice_context[0]->gb, buf + bytes_read, buf_size - bytes_read);

  1772.     } else {

  1773.         bytes_read = 0; /* avoid warning */

  1774.     }

  1775. 

  1776.     buf_p= buf + buf_size;

  1777.     for(i=f->slice_count-1; i>0; i--){

  1778.         FFV1Context *fs= f->slice_context[i];

  1779.         int v= AV_RB24(buf_p-3)+3;

  1780.         if(buf_p - buf <= v){

  1781.             av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");

  1782.             return -1;

  1783.         }

  1784.         buf_p -= v;

  1785.         if(fs->ac){

  1786.             ff_init_range_decoder(&fs->c, buf_p, v);

  1787.         }else{

  1788.             init_get_bits(&fs->gb, buf_p, v);

  1789.         }

  1790.     }

  1791. 

  1792.     avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1793.     f->picture_number++;

  1794. 

  1795.     *picture= *p;

  1796.     *data_size = sizeof(AVFrame);

  1797. 

  1798.     return buf_size;

  1799. }

  1800. 

  1801. AVCodec ff_ffv1_decoder = {

  1802.     "ffv1",

  1803.     AVMEDIA_TYPE_VIDEO,

  1804.     CODEC_ID_FFV1,

  1805.     sizeof(FFV1Context),

  1806.     decode_init,

  1807.     NULL,

  1808.     common_end,

  1809.     decode_frame,

  1810.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ | CODEC_CAP_SLICE_THREADS,

  1811.     NULL,

  1812.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1813. };

  1814. 

  1815. #if CONFIG_FFV1_ENCODER

  1816. AVCodec ff_ffv1_encoder = {

  1817.     "ffv1",

  1818.     AVMEDIA_TYPE_VIDEO,

  1819.     CODEC_ID_FFV1,

  1820.     sizeof(FFV1Context),

  1821.     encode_init,

  1822.     encode_frame,

  1823.     common_end,

  1824.     .capabilities = CODEC_CAP_SLICE_THREADS,

  1825.     .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_YUV420P10, PIX_FMT_YUV422P10, PIX_FMT_NONE},

  1826.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1827. };

  1828. #endif