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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 Libav.

  7.  *

  8.  * Libav 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.  * Libav 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 Libav; 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 "libavutil/avassert.h"

  29. #include "avcodec.h"

  30. #include "get_bits.h"

  31. #include "put_bits.h"

  32. #include "dsputil.h"

  33. #include "rangecoder.h"

  34. #include "golomb.h"

  35. #include "mathops.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 quant5_10bit[256] = {

  46.      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  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,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,

  50.      2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,

  51.      2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,

  52.      2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,

  53.      2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,

  54.     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,

  55.     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,

  56.     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,

  57.     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,

  58.     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -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, -0, -0, -0, -0, -0, -0, -0, -0, -0, -0,

  62. };

  63. 

  64. static const int8_t quant5[256] = {

  65.      0,  1,  1,  1,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,

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

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

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

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

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

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

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

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

  78.     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,

  79.     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,

  80.     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -1, -1,

  81. };

  82. 

  83. static const int8_t quant9_10bit[256] = {

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

  85.      2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  3,  3,  3,  3,  3,

  86.      3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,

  87.      3,  3,  3,  3,  3,  3,  3,  3,  4,  4,  4,  4,  4,  4,  4,  4,

  88.      4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,

  89.      4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,

  90.      4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,

  91.      4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,

  92.     -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4,

  93.     -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4,

  94.     -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4,

  95.     -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4,

  96.     -4, -4, -4, -4, -4, -4, -4, -4, -4, -3, -3, -3, -3, -3, -3, -3,

  97.     -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3,

  98.     -3, -3, -3, -3, -3, -3, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,

  99.     -2, -2, -2, -2, -1, -1, -1, -1, -1, -1, -1, -1, -0, -0, -0, -0,

  100. };

  101. 

  102. static const int8_t quant11[256] = {

  103.      0,  1,  2,  2,  2,  3,  3,  3,  3,  3,  3,  3,  4,  4,  4,  4,

  104.      4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,

  105.      4,  4,  4,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,

  106.      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,

  107.      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,

  108.      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,

  109.      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,

  110.      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,

  111.     -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5,

  112.     -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5,

  113.     -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5,

  114.     -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5,

  115.     -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5,

  116.     -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -5, -4, -4,

  117.     -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4,

  118.     -4, -4, -4, -4, -4, -3, -3, -3, -3, -3, -3, -3, -2, -2, -2, -1,

  119. };

  120. 

  121. static const uint8_t ver2_state[256] = {

  122.       0,  10,  10,  10,  10,  16,  16,  16,  28,  16,  16,  29,  42,  49,  20,  49,

  123.      59,  25,  26,  26,  27,  31,  33,  33,  33,  34,  34,  37,  67,  38,  39,  39,

  124.      40,  40,  41,  79,  43,  44,  45,  45,  48,  48,  64,  50,  51,  52,  88,  52,

  125.      53,  74,  55,  57,  58,  58,  74,  60,  101, 61,  62,  84,  66,  66,  68,  69,

  126.      87,  82,  71,  97,  73,  73,  82,  75,  111, 77,  94,  78,  87,  81,  83,  97,

  127.      85,  83,  94,  86,  99,  89,  90,  99,  111, 92,  93,  134, 95,  98,  105, 98,

  128.     105, 110, 102, 108, 102, 118, 103, 106, 106, 113, 109, 112, 114, 112, 116, 125,

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

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

  131.     147, 155, 151, 149, 151, 150, 152, 157, 153, 154, 156, 168, 158, 162, 161, 160,

  132.     172, 163, 169, 164, 166, 184, 167, 170, 177, 174, 171, 173, 182, 176, 180, 178,

  133.     175, 189, 179, 181, 186, 183, 192, 185, 200, 187, 191, 188, 190, 197, 193, 196,

  134.     197, 194, 195, 196, 198, 202, 199, 201, 210, 203, 207, 204, 205, 206, 208, 214,

  135.     209, 211, 221, 212, 213, 215, 224, 216, 217, 218, 219, 220, 222, 228, 223, 225,

  136.     226, 224, 227, 229, 240, 230, 231, 232, 233, 234, 235, 236, 238, 239, 237, 242,

  137.     241, 243, 242, 244, 245, 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 255,

  138. };

  139. 

  140. typedef struct VlcState {

  141.     int16_t drift;

  142.     uint16_t error_sum;

  143.     int8_t bias;

  144.     uint8_t count;

  145. } VlcState;

  146. 

  147. typedef struct PlaneContext {

  148.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

  149.     int quant_table_index;

  150.     int context_count;

  151.     uint8_t (*state)[CONTEXT_SIZE];

  152.     VlcState *vlc_state;

  153.     uint8_t interlace_bit_state[2];

  154. } PlaneContext;

  155. 

  156. #define MAX_SLICES 256

  157. 

  158. typedef struct FFV1Context {

  159.     AVCodecContext *avctx;

  160.     RangeCoder c;

  161.     GetBitContext gb;

  162.     PutBitContext pb;

  163.     uint64_t rc_stat[256][2];

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

  165.     int version;

  166.     int width, height;

  167.     int chroma_h_shift, chroma_v_shift;

  168.     int flags;

  169.     int picture_number;

  170.     AVFrame picture;

  171.     int plane_count;

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

  173.     PlaneContext plane[MAX_PLANES];

  174.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

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

  176.     int context_count[MAX_QUANT_TABLES];

  177.     uint8_t state_transition[256];

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

  179.     int run_index;

  180.     int colorspace;

  181.     int16_t *sample_buffer;

  182.     int gob_count;

  183. 

  184.     int quant_table_count;

  185. 

  186.     DSPContext dsp;

  187. 

  188.     struct FFV1Context *slice_context[MAX_SLICES];

  189.     int slice_count;

  190.     int num_v_slices;

  191.     int num_h_slices;

  192.     int slice_width;

  193.     int slice_height;

  194.     int slice_x;

  195.     int slice_y;

  196. } FFV1Context;

  197. 

  198. static av_always_inline int fold(int diff, int bits)

  199. {

  200.     if (bits == 8)

  201.         diff = (int8_t)diff;

  202.     else {

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

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

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

  206.     }

  207. 

  208.     return diff;

  209. }

  210. 

  211. static inline int predict(int16_t *src, int16_t *last)

  212. {

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

  214.     const int T  = last[0];

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

  216. 

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

  218. }

  219. 

  220. static inline int get_context(PlaneContext *p, int16_t *src,

  221.                               int16_t *last, int16_t *last2)

  222. {

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

  224.     const int T  = last[0];

  225.     const int RT = last[1];

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

  227. 

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

  229.         const int TT = last2[0];

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

  231.         return p->quant_table[0][(L - LT) & 0xFF] +

  232.                p->quant_table[1][(LT - T) & 0xFF] +

  233.                p->quant_table[2][(T - RT) & 0xFF] +

  234.                p->quant_table[3][(LL - L) & 0xFF] +

  235.                p->quant_table[4][(TT - T) & 0xFF];

  236.     } else

  237.         return p->quant_table[0][(L - LT) & 0xFF] +

  238.                p->quant_table[1][(LT - T) & 0xFF] +

  239.                p->quant_table[2][(T - RT) & 0xFF];

  240. }

  241. 

  242. static void find_best_state(uint8_t best_state[256][256],

  243.                             const uint8_t one_state[256])

  244. {

  245.     int i, j, k, m;

  246.     double l2tab[256];

  247. 

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

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

  250. 

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

  252.         double best_len[256];

  253.         double p = i / 256.0;

  254. 

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

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

  257. 

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

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

  260.             double len      = 0;

  261.             occ[j] = 1.0;

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

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

  264.                 for (m = 0; m < 256; m++)

  265.                     if (occ[m]) {

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

  267.                                         (1 - p) * l2tab[256 - m]);

  268.                     }

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

  270.                     best_len[k]      = len;

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

  272.                 }

  273.                 for (m = 0; m < 256; m++)

  274.                     if (occ[m]) {

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

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

  277.                     }

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

  279.             }

  280.         }

  281.     }

  282. }

  283. 

  284. static av_always_inline av_flatten void put_symbol_inline(RangeCoder *c,

  285.                                                           uint8_t *state, int v,

  286.                                                           int is_signed,

  287.                                                           uint64_t rc_stat[256][2],

  288.                                                           uint64_t rc_stat2[32][2])

  289. {

  290.     int i;

  291. 

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

  293.     do {                                        \

  294.         if (rc_stat) {                          \

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

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

  297.         }                                       \

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

  299.     } while (0)

  300. 

  301.     if (v) {

  302.         const int a = FFABS(v);

  303.         const int e = av_log2(a);

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

  305.         if (e <= 9) {

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

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

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

  309. 

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

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

  312. 

  313.             if (is_signed)

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

  315.         } else {

  316.             for (i = 0; i < e; i++)

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

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

  319. 

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

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

  322. 

  323.             if (is_signed)

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

  325.         }

  326.     } else {

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

  328.     }

  329. #undef put_rac

  330. }

  331. 

  332. static av_noinline void put_symbol(RangeCoder *c, uint8_t *state,

  333.                                    int v, int is_signed)

  334. {

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

  336. }

  337. 

  338. static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state,

  339.                                                int is_signed)

  340. {

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

  342.         return 0;

  343.     else {

  344.         int i, e, a;

  345.         e = 0;

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

  347.             e++;

  348. 

  349.         a = 1;

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

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

  352. 

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

  354.         return (a ^ e) - e;

  355.     }

  356. }

  357. 

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

  359. {

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

  361. }

  362. 

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

  364. {

  365.     int drift = state->drift;

  366.     int count = state->count;

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

  368.     drift            += v;

  369. 

  370.     if (count == 128) { // FIXME: variable

  371.         count            >>= 1;

  372.         drift            >>= 1;

  373.         state->error_sum >>= 1;

  374.     }

  375.     count++;

  376. 

  377.     if (drift <= -count) {

  378.         if (state->bias > -128)

  379.             state->bias--;

  380. 

  381.         drift += count;

  382.         if (drift <= -count)

  383.             drift = -count + 1;

  384.     } else if (drift > 0) {

  385.         if (state->bias < 127)

  386.             state->bias++;

  387. 

  388.         drift -= count;

  389.         if (drift > 0)

  390.             drift = 0;

  391.     }

  392. 

  393.     state->drift = drift;

  394.     state->count = count;

  395. }

  396. 

  397. static inline void put_vlc_symbol(PutBitContext *pb, VlcState *const state,

  398.                                   int v, int bits)

  399. {

  400.     int i, k, code;

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

  402. 

  403.     i = state->count;

  404.     k = 0;

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

  406.         k++;

  407.         i += i;

  408.     }

  409. 

  410.     assert(k <= 8);

  411. 

  412. #if 0 // JPEG LS

  413.     if (k == 0 && 2 * state->drift <= -state->count)

  414.         code = v ^ (-1);

  415.     else

  416.         code = v;

  417. #else

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

  419. #endif

  420. 

  421.     av_dlog(NULL, "v:%d/%d bias:%d error:%d drift:%d count:%d k:%d\n", v, code,

  422.             state->bias, state->error_sum, state->drift, state->count, k);

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

  424. 

  425.     update_vlc_state(state, v);

  426. }

  427. 

  428. static inline int get_vlc_symbol(GetBitContext *gb, VlcState *const state,

  429.                                  int bits)

  430. {

  431.     int k, i, v, ret;

  432. 

  433.     i = state->count;

  434.     k = 0;

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

  436.         k++;

  437.         i += i;

  438.     }

  439. 

  440.     assert(k <= 8);

  441. 

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

  443.     av_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d",

  444.             v, state->bias, state->error_sum, state->drift, state->count, k);

  445. 

  446. #if 0 // JPEG LS

  447.     if (k == 0 && 2 * state->drift <= -state->count)

  448.         v ^= (-1);

  449. #else

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

  451. #endif

  452. 

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

  454. 

  455.     update_vlc_state(state, v);

  456. 

  457.     return ret;

  458. }

  459. 

  460. #if CONFIG_FFV1_ENCODER

  461. static av_always_inline int encode_line(FFV1Context *s, int w,

  462.                                         int16_t *sample[3],

  463.                                         int plane_index, int bits)

  464. {

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

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

  467.     int x;

  468.     int run_index = s->run_index;

  469.     int run_count = 0;

  470.     int run_mode  = 0;

  471. 

  472.     if (s->ac) {

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

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

  475.             return -1;

  476.         }

  477.     } else {

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

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

  480.             return -1;

  481.         }

  482.     }

  483. 

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

  485.         int diff, context;

  486. 

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

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

  489. 

  490.         if (context < 0) {

  491.             context = -context;

  492.             diff    = -diff;

  493.         }

  494. 

  495.         diff = fold(diff, bits);

  496. 

  497.         if (s->ac) {

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

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

  500.                                   s->rc_stat2[p->quant_table_index][context]);

  501.             } else {

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

  503.             }

  504.         } else {

  505.             if (context == 0)

  506.                 run_mode = 1;

  507. 

  508.             if (run_mode) {

  509.                 if (diff) {

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

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

  512.                         run_index++;

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

  514.                     }

  515. 

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

  517.                     if (run_index)

  518.                         run_index--;

  519.                     run_count = 0;

  520.                     run_mode  = 0;

  521.                     if (diff > 0)

  522.                         diff--;

  523.                 } else {

  524.                     run_count++;

  525.                 }

  526.             }

  527. 

  528.             av_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",

  529.                     run_count, run_index, run_mode, x,

  530.                     (int)put_bits_count(&s->pb));

  531. 

  532.             if (run_mode == 0)

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

  534.         }

  535.     }

  536.     if (run_mode) {

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

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

  539.             run_index++;

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

  541.         }

  542. 

  543.         if (run_count)

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

  545.     }

  546.     s->run_index = run_index;

  547. 

  548.     return 0;

  549. }

  550. 

  551. static void encode_plane(FFV1Context *s, uint8_t *src, int w, int h,

  552.                          int stride, int plane_index)

  553. {

  554.     int x, y, i;

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

  556.     int16_t *sample[3];

  557.     s->run_index = 0;

  558. 

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

  560. 

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

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

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

  564. 

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

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

  567. // { START_TIMER

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

  569.             for (x = 0; x < w; x++)

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

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

  572.         } else {

  573.             for (x = 0; x < w; x++)

  574.                 sample[0][x] = ((uint16_t *)(src + stride * y))[x] >>

  575.                                (16 - s->avctx->bits_per_raw_sample);

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

  577.         }

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

  579.     }

  580. }

  581. 

  582. static void encode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h,

  583.                              int stride)

  584. {

  585.     int x, y, p, i;

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

  587.     int16_t *sample[3][3];

  588.     s->run_index = 0;

  589. 

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

  591. 

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

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

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

  595.                 sample[p][i] = s->sample_buffer + p * ring_size * (w + 6) +

  596.                                ((h + i - y) % ring_size) * (w + 6) + 3;

  597. 

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

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

  600.             int b =  v        & 0xFF;

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

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

  603. 

  604.             b -= g;

  605.             r -= g;

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

  607.             b += 0x100;

  608.             r += 0x100;

  609. 

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

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

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

  613.         }

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

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

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

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

  618.         }

  619.     }

  620. }

  621. 

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

  623. {

  624.     int last = 0;

  625.     int i;

  626.     uint8_t state[CONTEXT_SIZE];

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

  628. 

  629.     for (i = 1; i < 128; i++)

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

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

  632.             last = i;

  633.         }

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

  635. }

  636. 

  637. static void write_quant_tables(RangeCoder *c,

  638.                                int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  639. {

  640.     int i;

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

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

  643. }

  644. 

  645. static void write_header(FFV1Context *f)

  646. {

  647.     uint8_t state[CONTEXT_SIZE];

  648.     int i, j;

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

  650. 

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

  652. 

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

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

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

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

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

  658.                 put_symbol(c, state,

  659.                            f->state_transition[i] - c->one_state[i], 1);

  660.         }

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

  662.         if (f->version > 0)

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

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

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

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

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

  668. 

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

  670.     } else {

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

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

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

  674.             put_symbol(c, state,

  675.                        (fs->slice_x      + 1) * f->num_h_slices / f->width, 0);

  676.             put_symbol(c, state,

  677.                        (fs->slice_y      + 1) * f->num_v_slices / f->height, 0);

  678.             put_symbol(c, state,

  679.                        (fs->slice_width  + 1) * f->num_h_slices / f->width - 1,

  680.                        0);

  681.             put_symbol(c, state,

  682.                        (fs->slice_height + 1) * f->num_v_slices / f->height - 1,

  683.                        0);

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

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

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

  687.             }

  688.         }

  689.     }

  690. }

  691. 

  692. #endif /* CONFIG_FFV1_ENCODER */

  693. 

  694. static av_cold int common_init(AVCodecContext *avctx)

  695. {

  696.     FFV1Context *s = avctx->priv_data;

  697. 

  698.     s->avctx = avctx;

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

  700. 

  701.     ff_dsputil_init(&s->dsp, avctx);

  702. 

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

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

  705. 

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

  707.     // defaults

  708.     s->num_h_slices = 1;

  709.     s->num_v_slices = 1;

  710. 

  711.     return 0;

  712. }

  713. 

  714. static int init_slice_state(FFV1Context *f)

  715. {

  716.     int i, j;

  717. 

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

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

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

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

  722. 

  723.             if (fs->ac) {

  724.                 if (!p->state)

  725.                     p->state = av_malloc(CONTEXT_SIZE * p->context_count *

  726.                                          sizeof(uint8_t));

  727.                 if (!p->state)

  728.                     return AVERROR(ENOMEM);

  729.             } else {

  730.                 if (!p->vlc_state)

  731.                     p->vlc_state = av_malloc(p->context_count * sizeof(VlcState));

  732.                 if (!p->vlc_state)

  733.                     return AVERROR(ENOMEM);

  734.             }

  735.         }

  736. 

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

  738.             // FIXME: only redo if state_transition changed

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

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

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

  742.             }

  743.         }

  744.     }

  745. 

  746.     return 0;

  747. }

  748. 

  749. static av_cold int init_slice_contexts(FFV1Context *f)

  750. {

  751.     int i;

  752. 

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

  754. 

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

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

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

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

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

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

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

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

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

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

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

  766. 

  767.         fs->slice_width  = sxe - sxs;

  768.         fs->slice_height = sye - sys;

  769.         fs->slice_x      = sxs;

  770.         fs->slice_y      = sys;

  771. 

  772.         fs->sample_buffer = av_malloc(9 * (fs->width + 6) *

  773.                                       sizeof(*fs->sample_buffer));

  774.         if (!fs->sample_buffer)

  775.             return AVERROR(ENOMEM);

  776.     }

  777.     return 0;

  778. }

  779. 

  780. static int allocate_initial_states(FFV1Context *f)

  781. {

  782.     int i;

  783. 

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

  785.         f->initial_states[i] = av_malloc(f->context_count[i] *

  786.                                          sizeof(*f->initial_states[i]));

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

  788.             return AVERROR(ENOMEM);

  789.         memset(f->initial_states[i], 128,

  790.                f->context_count[i] * sizeof(*f->initial_states[i]));

  791.     }

  792.     return 0;

  793. }

  794. 

  795. #if CONFIG_FFV1_ENCODER

  796. static int write_extra_header(FFV1Context *f)

  797. {

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

  799.     uint8_t state[CONTEXT_SIZE];

  800.     int i, j, k;

  801.     uint8_t state2[32][CONTEXT_SIZE];

  802. 

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

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

  805. 

  806.     f->avctx->extradata = av_malloc(f->avctx->extradata_size = 10000 +

  807.                                     (11 * 11 * 5 * 5 * 5 + 11 * 11 * 11) * 32);

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

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

  810. 

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

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

  813.     if (f->ac > 1)

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

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

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

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

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

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

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

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

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

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

  824. 

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

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

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

  828. 

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

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

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

  832.                 break;

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

  834.             put_rac(c, state, 1);

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

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

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

  838.                     put_symbol(c, state2[k],

  839.                                (int8_t)(f->initial_states[i][j][k] - pred), 1);

  840.                 }

  841.         } else {

  842.             put_rac(c, state, 0);

  843.         }

  844.     }

  845. 

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

  847. 

  848.     return 0;

  849. }

  850. 

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

  852. {

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

  854. 

  855.     do {

  856.         changed = 0;

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

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

  859. 

  860. #define COST(old, new)                                      \

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

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

  863. 

  864. #define COST2(old, new)                         \

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

  866. 

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

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

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

  870.                     int j;

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

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

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

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

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

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

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

  878.                     }

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

  880.                         if (stt[j] == i)

  881.                             stt[j] = i2;

  882.                         else if (stt[j] == i2)

  883.                             stt[j] = i;

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

  885.                             if (stt[256 - j] == 256 - i)

  886.                                 stt[256 - j] = 256 - i2;

  887.                             else if (stt[256 - j] == 256 - i2)

  888.                                 stt[256 - j] = 256 - i;

  889.                         }

  890.                     }

  891.                     print = changed = 1;

  892.                 }

  893.             }

  894.         }

  895.     } while (changed);

  896.     return print;

  897. }

  898. 

  899. static av_cold int encode_init(AVCodecContext *avctx)

  900. {

  901.     FFV1Context *s = avctx->priv_data;

  902.     int i, j, k, m;

  903. 

  904.     common_init(avctx);

  905. 

  906.     s->version = 0;

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

  908. 

  909.     if (s->ac > 1)

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

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

  912. 

  913.     s->plane_count = 2;

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

  915.         s->quant_table_count = 2;

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

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

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

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

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

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

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

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

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

  925.         } else {

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

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

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

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

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

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

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

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

  934.         }

  935.     }

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

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

  938.     memcpy(s->quant_table, s->quant_tables[avctx->context_model],

  939.            sizeof(s->quant_table));

  940. 

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

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

  943. 

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

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

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

  947.     }

  948. 

  949.     if (allocate_initial_states(s) < 0)

  950.         return AVERROR(ENOMEM);

  951. 

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

  953.     switch (avctx->pix_fmt) {

  954.     case AV_PIX_FMT_YUV444P16:

  955.     case AV_PIX_FMT_YUV422P16:

  956.     case AV_PIX_FMT_YUV420P16:

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

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

  959.             return -1;

  960.         }

  961.         if (!s->ac) {

  962.             av_log(avctx, AV_LOG_ERROR,

  963.                    "bits_per_raw_sample of more than 8 needs -coder 1 currently\n");

  964.             return -1;

  965.         }

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

  967.     case AV_PIX_FMT_YUV444P:

  968.     case AV_PIX_FMT_YUV422P:

  969.     case AV_PIX_FMT_YUV420P:

  970.     case AV_PIX_FMT_YUV411P:

  971.     case AV_PIX_FMT_YUV410P:

  972.         s->colorspace = 0;

  973.         break;

  974.     case AV_PIX_FMT_RGB32:

  975.         s->colorspace = 1;

  976.         break;

  977.     default:

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

  979.         return -1;

  980.     }

  981.     avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift,

  982.                                   &s->chroma_v_shift);

  983. 

  984.     s->picture_number = 0;

  985. 

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

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

  988.             s->rc_stat2[i] = av_mallocz(s->context_count[i] *

  989.                                         sizeof(*s->rc_stat2[i]));

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

  991.                 return AVERROR(ENOMEM);

  992.         }

  993.     }

  994.     if (avctx->stats_in) {

  995.         char *p = avctx->stats_in;

  996.         uint8_t best_state[256][256];

  997.         int gob_count = 0;

  998.         char *next;

  999. 

  1000.         av_assert0(s->version >= 2);

  1001. 

  1002.         for (;; ) {

  1003.             for (j = 0; j < 256; j++)

  1004.                 for (i = 0; i < 2; i++) {

  1005.                     s->rc_stat[j][i] = strtol(p, &next, 0);

  1006.                     if (next == p) {

  1007.                         av_log(avctx, AV_LOG_ERROR,

  1008.                                "2Pass file invalid at %d %d [%s]\n", j, i, p);

  1009.                         return -1;

  1010.                     }

  1011.                     p = next;

  1012.                 }

  1013.             for (i = 0; i < s->quant_table_count; i++)

  1014.                 for (j = 0; j < s->context_count[i]; j++) {

  1015.                     for (k = 0; k < 32; k++)

  1016.                         for (m = 0; m < 2; m++) {

  1017.                             s->rc_stat2[i][j][k][m] = strtol(p, &next, 0);

  1018.                             if (next == p) {

  1019.                                 av_log(avctx, AV_LOG_ERROR,

  1020.                                        "2Pass file invalid at %d %d %d %d [%s]\n",

  1021.                                        i, j, k, m, p);

  1022.                                 return -1;

  1023.                             }

  1024.                             p = next;

  1025.                         }

  1026.                 }

  1027.             gob_count = strtol(p, &next, 0);

  1028.             if (next == p || gob_count < 0) {

  1029.                 av_log(avctx, AV_LOG_ERROR, "2Pass file invalid\n");

  1030.                 return -1;

  1031.             }

  1032.             p = next;

  1033.             while (*p == '\n' || *p == ' ')

  1034.                 p++;

  1035.             if (p[0] == 0)

  1036.                 break;

  1037.         }

  1038.         sort_stt(s, s->state_transition);

  1039. 

  1040.         find_best_state(best_state, s->state_transition);

  1041. 

  1042.         for (i = 0; i < s->quant_table_count; i++) {

  1043.             for (j = 0; j < s->context_count[i]; j++)

  1044.                 for (k = 0; k < 32; k++) {

  1045.                     double p = 128;

  1046.                     if (s->rc_stat2[i][j][k][0] + s->rc_stat2[i][j][k][1]) {

  1047.                         p = 256.0 * s->rc_stat2[i][j][k][1] /

  1048.                             (s->rc_stat2[i][j][k][0] + s->rc_stat2[i][j][k][1]);

  1049.                     }

  1050.                     s->initial_states[i][j][k] =

  1051.                         best_state[av_clip(round(p), 1, 255)][av_clip((s->rc_stat2[i][j][k][0] +

  1052.                                                                        s->rc_stat2[i][j][k][1]) /

  1053.                                                                       gob_count, 0, 255)];

  1054.                 }

  1055.         }

  1056.     }

  1057. 

  1058.     if (s->version > 1) {

  1059.         s->num_h_slices = 2;

  1060.         s->num_v_slices = 2;

  1061.         write_extra_header(s);

  1062.     }

  1063. 

  1064.     if (init_slice_contexts(s) < 0)

  1065.         return -1;

  1066.     if (init_slice_state(s) < 0)

  1067.         return -1;

  1068. 

  1069. #define STATS_OUT_SIZE 1024 * 1024 * 6

  1070.     if (avctx->flags & CODEC_FLAG_PASS1) {

  1071.         avctx->stats_out = av_mallocz(STATS_OUT_SIZE);

  1072.         for (i = 0; i < s->quant_table_count; i++)

  1073.             for (j = 0; j < s->slice_count; j++) {

  1074.                 FFV1Context *sf = s->slice_context[j];

  1075.                 av_assert0(!sf->rc_stat2[i]);

  1076.                 sf->rc_stat2[i] = av_mallocz(s->context_count[i] *

  1077.                                              sizeof(*sf->rc_stat2[i]));

  1078.                 if (!sf->rc_stat2[i])

  1079.                     return AVERROR(ENOMEM);

  1080.             }

  1081.     }

  1082. 

  1083.     return 0;

  1084. }

  1085. 

  1086. #endif /* CONFIG_FFV1_ENCODER */

  1087. 

  1088. static void clear_state(FFV1Context *f)

  1089. {

  1090.     int i, si, j;

  1091. 

  1092.     for (si = 0; si < f->slice_count; si++) {

  1093.         FFV1Context *fs = f->slice_context[si];

  1094.         for (i = 0; i < f->plane_count; i++) {

  1095.             PlaneContext *p = &fs->plane[i];

  1096. 

  1097.             p->interlace_bit_state[0] = 128;

  1098.             p->interlace_bit_state[1] = 128;

  1099. 

  1100.             if (fs->ac) {

  1101.                 if (f->initial_states[p->quant_table_index]) {

  1102.                     memcpy(p->state, f->initial_states[p->quant_table_index],

  1103.                            CONTEXT_SIZE * p->context_count);

  1104.                 } else

  1105.                     memset(p->state, 128, CONTEXT_SIZE * p->context_count);

  1106.             } else {

  1107.                 for (j = 0; j < p->context_count; j++) {

  1108.                     p->vlc_state[j].drift     = 0;

  1109.                     p->vlc_state[j].error_sum = 4; // FFMAX((RANGE + 32)/64, 2);

  1110.                     p->vlc_state[j].bias      = 0;

  1111.                     p->vlc_state[j].count     = 1;

  1112.                 }

  1113.             }

  1114.         }

  1115.     }

  1116. }

  1117. 

  1118. #if CONFIG_FFV1_ENCODER

  1119. static int encode_slice(AVCodecContext *c, void *arg)

  1120. {

  1121.     FFV1Context *fs  = *(void **)arg;

  1122.     FFV1Context *f   = fs->avctx->priv_data;

  1123.     int width        = fs->slice_width;

  1124.     int height       = fs->slice_height;

  1125.     int x            = fs->slice_x;

  1126.     int y            = fs->slice_y;

  1127.     AVFrame *const p = &f->picture;

  1128. 

  1129.     if (f->colorspace == 0) {

  1130.         const int chroma_width  = -((-width) >> f->chroma_h_shift);

  1131.         const int chroma_height = -((-height) >> f->chroma_v_shift);

  1132.         const int cx            = x >> f->chroma_h_shift;

  1133.         const int cy            = y >> f->chroma_v_shift;

  1134. 

  1135.         encode_plane(fs, p->data[0] + x + y * p->linesize[0],

  1136.                      width, height, p->linesize[0], 0);

  1137. 

  1138.         encode_plane(fs, p->data[1] + cx + cy * p->linesize[1],

  1139.                      chroma_width, chroma_height, p->linesize[1], 1);

  1140.         encode_plane(fs, p->data[2] + cx + cy * p->linesize[2],

  1141.                      chroma_width, chroma_height, p->linesize[2], 1);

  1142.     } else {

  1143.         encode_rgb_frame(fs, (uint32_t *)(p->data[0]) +

  1144.                          x + y * (p->linesize[0] / 4),

  1145.                          width, height, p->linesize[0] / 4);

  1146.     }

  1147.     emms_c();

  1148. 

  1149.     return 0;

  1150. }

  1151. 

  1152. static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,

  1153.                         const AVFrame *pict, int *got_packet)

  1154. {

  1155.     FFV1Context *f      = avctx->priv_data;

  1156.     RangeCoder *const c = &f->slice_context[0]->c;

  1157.     AVFrame *const p    = &f->picture;

  1158.     int used_count      = 0;

  1159.     uint8_t keystate    = 128;

  1160.     uint8_t *buf_p;

  1161.     int i, ret;

  1162. 

  1163.     if (!pkt->data &&

  1164.         (ret = av_new_packet(pkt, avctx->width * avctx->height *

  1165.                              ((8 * 2 + 1 + 1) * 4) / 8 + FF_MIN_BUFFER_SIZE)) < 0) {

  1166.         av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");

  1167.         return ret;

  1168.     }

  1169. 

  1170.     ff_init_range_encoder(c, pkt->data, pkt->size);

  1171.     ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);

  1172. 

  1173.     *p           = *pict;

  1174.     p->pict_type = AV_PICTURE_TYPE_I;

  1175. 

  1176.     if (avctx->gop_size == 0 || f->picture_number % avctx->gop_size == 0) {

  1177.         put_rac(c, &keystate, 1);

  1178.         p->key_frame = 1;

  1179.         f->gob_count++;

  1180.         write_header(f);

  1181.         clear_state(f);

  1182.     } else {

  1183.         put_rac(c, &keystate, 0);

  1184.         p->key_frame = 0;

  1185.     }

  1186. 

  1187.     if (!f->ac) {

  1188.         used_count += ff_rac_terminate(c);

  1189.         init_put_bits(&f->slice_context[0]->pb, pkt->data + used_count,

  1190.                       pkt->size - used_count);

  1191.     } else if (f->ac > 1) {

  1192.         int i;

  1193.         for (i = 1; i < 256; i++) {

  1194.             c->one_state[i]        = f->state_transition[i];

  1195.             c->zero_state[256 - i] = 256 - c->one_state[i];

  1196.         }

  1197.     }

  1198. 

  1199.     for (i = 1; i < f->slice_count; i++) {

  1200.         FFV1Context *fs = f->slice_context[i];

  1201.         uint8_t *start  = pkt->data + (pkt->size - used_count) * i / f->slice_count;

  1202.         int len         = pkt->size / f->slice_count;

  1203. 

  1204.         if (fs->ac)

  1205.             ff_init_range_encoder(&fs->c, start, len);

  1206.         else

  1207.             init_put_bits(&fs->pb, start, len);

  1208.     }

  1209.     avctx->execute(avctx, encode_slice, &f->slice_context[0], NULL,

  1210.                    f->slice_count, sizeof(void *));

  1211. 

  1212.     buf_p = pkt->data;

  1213.     for (i = 0; i < f->slice_count; i++) {

  1214.         FFV1Context *fs = f->slice_context[i];

  1215.         int bytes;

  1216. 

  1217.         if (fs->ac) {

  1218.             uint8_t state = 128;

  1219.             put_rac(&fs->c, &state, 0);

  1220.             bytes = ff_rac_terminate(&fs->c);

  1221.         } else {

  1222.             flush_put_bits(&fs->pb); // FIXME: nicer padding

  1223.             bytes      = used_count + (put_bits_count(&fs->pb) + 7) / 8;

  1224.             used_count = 0;

  1225.         }

  1226.         if (i > 0) {

  1227.             av_assert0(bytes < pkt->size / f->slice_count);

  1228.             memmove(buf_p, fs->ac ? fs->c.bytestream_start : fs->pb.buf, bytes);

  1229.             av_assert0(bytes < (1 << 24));

  1230.             AV_WB24(buf_p + bytes, bytes);

  1231.             bytes += 3;

  1232.         }

  1233.         buf_p += bytes;

  1234.     }

  1235. 

  1236.     if ((avctx->flags & CODEC_FLAG_PASS1) && (f->picture_number & 31) == 0) {

  1237.         int j, k, m;

  1238.         char *p   = avctx->stats_out;

  1239.         char *end = p + STATS_OUT_SIZE;

  1240. 

  1241.         memset(f->rc_stat, 0, sizeof(f->rc_stat));

  1242.         for (i = 0; i < f->quant_table_count; i++)

  1243.             memset(f->rc_stat2[i], 0, f->context_count[i] * sizeof(*f->rc_stat2[i]));

  1244. 

  1245.         for (j = 0; j < f->slice_count; j++) {

  1246.             FFV1Context *fs = f->slice_context[j];

  1247.             for (i = 0; i < 256; i++) {

  1248.                 f->rc_stat[i][0] += fs->rc_stat[i][0];

  1249.                 f->rc_stat[i][1] += fs->rc_stat[i][1];

  1250.             }

  1251.             for (i = 0; i < f->quant_table_count; i++) {

  1252.                 for (k = 0; k < f->context_count[i]; k++)

  1253.                     for (m = 0; m < 32; m++) {

  1254.                         f->rc_stat2[i][k][m][0] += fs->rc_stat2[i][k][m][0];

  1255.                         f->rc_stat2[i][k][m][1] += fs->rc_stat2[i][k][m][1];

  1256.                     }

  1257.             }

  1258.         }

  1259. 

  1260.         for (j = 0; j < 256; j++) {

  1261.             snprintf(p, end - p, "%" PRIu64 " %" PRIu64 " ",

  1262.                      f->rc_stat[j][0], f->rc_stat[j][1]);

  1263.             p += strlen(p);

  1264.         }

  1265.         snprintf(p, end - p, "\n");

  1266. 

  1267.         for (i = 0; i < f->quant_table_count; i++) {

  1268.             for (j = 0; j < f->context_count[i]; j++)

  1269.                 for (m = 0; m < 32; m++) {

  1270.                     snprintf(p, end - p, "%" PRIu64 " %" PRIu64 " ",

  1271.                              f->rc_stat2[i][j][m][0], f->rc_stat2[i][j][m][1]);

  1272.                     p += strlen(p);

  1273.                 }

  1274.         }

  1275.         snprintf(p, end - p, "%d\n", f->gob_count);

  1276.     } else if (avctx->flags & CODEC_FLAG_PASS1)

  1277.         avctx->stats_out[0] = '\0';

  1278. 

  1279.     f->picture_number++;

  1280.     pkt->size   = buf_p - pkt->data;

  1281.     pkt->flags |= AV_PKT_FLAG_KEY * p->key_frame;

  1282.     *got_packet = 1;

  1283. 

  1284.     return 0;

  1285. }

  1286. 

  1287. #endif /* CONFIG_FFV1_ENCODER */

  1288. 

  1289. static av_cold int common_end(AVCodecContext *avctx)

  1290. {

  1291.     FFV1Context *s = avctx->priv_data;

  1292.     int i, j;

  1293. 

  1294.     if (avctx->codec->decode && s->picture.data[0])

  1295.         avctx->release_buffer(avctx, &s->picture);

  1296. 

  1297.     for (j = 0; j < s->slice_count; j++) {

  1298.         FFV1Context *fs = s->slice_context[j];

  1299.         for (i = 0; i < s->plane_count; i++) {

  1300.             PlaneContext *p = &fs->plane[i];

  1301. 

  1302.             av_freep(&p->state);

  1303.             av_freep(&p->vlc_state);

  1304.         }

  1305.         av_freep(&fs->sample_buffer);

  1306.     }

  1307. 

  1308.     av_freep(&avctx->stats_out);

  1309.     for (j = 0; j < s->quant_table_count; j++) {

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

  1311.         for (i = 0; i < s->slice_count; i++) {

  1312.             FFV1Context *sf = s->slice_context[i];

  1313.             av_freep(&sf->rc_stat2[j]);

  1314.         }

  1315.         av_freep(&s->rc_stat2[j]);

  1316.     }

  1317. 

  1318.     for (i = 0; i < s->slice_count; i++)

  1319.         av_freep(&s->slice_context[i]);

  1320. 

  1321.     return 0;

  1322. }

  1323. 

  1324. static av_always_inline void decode_line(FFV1Context *s, int w,

  1325.                                          int16_t *sample[2],

  1326.                                          int plane_index, int bits)

  1327. {

  1328.     PlaneContext *const p = &s->plane[plane_index];

  1329.     RangeCoder *const c   = &s->c;

  1330.     int x;

  1331.     int run_count = 0;

  1332.     int run_mode  = 0;

  1333.     int run_index = s->run_index;

  1334. 

  1335.     for (x = 0; x < w; x++) {

  1336.         int diff, context, sign;

  1337. 

  1338.         context = get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);

  1339.         if (context < 0) {

  1340.             context = -context;

  1341.             sign    = 1;

  1342.         } else

  1343.             sign = 0;

  1344. 

  1345.         av_assert2(context < p->context_count);

  1346. 

  1347.         if (s->ac) {

  1348.             diff = get_symbol_inline(c, p->state[context], 1);

  1349.         } else {

  1350.             if (context == 0 && run_mode == 0)

  1351.                 run_mode = 1;

  1352. 

  1353.             if (run_mode) {

  1354.                 if (run_count == 0 && run_mode == 1) {

  1355.                     if (get_bits1(&s->gb)) {

  1356.                         run_count = 1 << ff_log2_run[run_index];

  1357.                         if (x + run_count <= w)

  1358.                             run_index++;

  1359.                     } else {

  1360.                         if (ff_log2_run[run_index])

  1361.                             run_count = get_bits(&s->gb, ff_log2_run[run_index]);

  1362.                         else

  1363.                             run_count = 0;

  1364.                         if (run_index)

  1365.                             run_index--;

  1366.                         run_mode = 2;

  1367.                     }

  1368.                 }

  1369.                 run_count--;

  1370.                 if (run_count < 0) {

  1371.                     run_mode  = 0;

  1372.                     run_count = 0;

  1373.                     diff      = get_vlc_symbol(&s->gb, &p->vlc_state[context],

  1374.                                                bits);

  1375.                     if (diff >= 0)

  1376.                         diff++;

  1377.                 } else

  1378.                     diff = 0;

  1379.             } else

  1380.                 diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1381. 

  1382.             av_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",

  1383.                     run_count, run_index, run_mode, x, get_bits_count(&s->gb));

  1384.         }

  1385. 

  1386.         if (sign)

  1387.             diff = -diff;

  1388. 

  1389.         sample[1][x] = (predict(sample[1] + x, sample[0] + x) + diff) &

  1390.                        ((1 << bits) - 1);

  1391.     }

  1392.     s->run_index = run_index;

  1393. }

  1394. 

  1395. static void decode_plane(FFV1Context *s, uint8_t *src,

  1396.                          int w, int h, int stride, int plane_index)

  1397. {

  1398.     int x, y;

  1399.     int16_t *sample[2];

  1400.     sample[0] = s->sample_buffer + 3;

  1401.     sample[1] = s->sample_buffer + w + 6 + 3;

  1402. 

  1403.     s->run_index = 0;

  1404. 

  1405.     memset(s->sample_buffer, 0, 2 * (w + 6) * sizeof(*s->sample_buffer));

  1406. 

  1407.     for (y = 0; y < h; y++) {

  1408.         int16_t *temp = sample[0]; // FIXME: try a normal buffer

  1409. 

  1410.         sample[0] = sample[1];

  1411.         sample[1] = temp;

  1412. 

  1413.         sample[1][-1] = sample[0][0];

  1414.         sample[0][w]  = sample[0][w - 1];

  1415. 

  1416. // { START_TIMER

  1417.         if (s->avctx->bits_per_raw_sample <= 8) {

  1418.             decode_line(s, w, sample, plane_index, 8);

  1419.             for (x = 0; x < w; x++)

  1420.                 src[x + stride * y] = sample[1][x];

  1421.         } else {

  1422.             decode_line(s, w, sample, plane_index,

  1423.                         s->avctx->bits_per_raw_sample);

  1424.             for (x = 0; x < w; x++)

  1425.                 ((uint16_t *)(src + stride * y))[x] =

  1426.                     sample[1][x] << (16 - s->avctx->bits_per_raw_sample);

  1427.         }

  1428. // STOP_TIMER("decode-line") }

  1429.     }

  1430. }

  1431. 

  1432. static void decode_rgb_frame(FFV1Context *s, uint32_t *src,

  1433.                              int w, int h, int stride)

  1434. {

  1435.     int x, y, p;

  1436.     int16_t *sample[3][2];

  1437.     for (x = 0; x < 3; x++) {

  1438.         sample[x][0] = s->sample_buffer +  x * 2      * (w + 6) + 3;

  1439.         sample[x][1] = s->sample_buffer + (x * 2 + 1) * (w + 6) + 3;

  1440.     }

  1441. 

  1442.     s->run_index = 0;

  1443. 

  1444.     memset(s->sample_buffer, 0, 6 * (w + 6) * sizeof(*s->sample_buffer));

  1445. 

  1446.     for (y = 0; y < h; y++) {

  1447.         for (p = 0; p < 3; p++) {

  1448.             int16_t *temp = sample[p][0]; // FIXME: try a normal buffer

  1449. 

  1450.             sample[p][0] = sample[p][1];

  1451.             sample[p][1] = temp;

  1452. 

  1453.             sample[p][1][-1] = sample[p][0][0];

  1454.             sample[p][0][w]  = sample[p][0][w - 1];

  1455.             decode_line(s, w, sample[p], FFMIN(p, 1), 9);

  1456.         }

  1457.         for (x = 0; x < w; x++) {

  1458.             int g = sample[0][1][x];

  1459.             int b = sample[1][1][x];

  1460.             int r = sample[2][1][x];

  1461. 

  1462. //            assert(g >= 0  && b >= 0  && r >= 0);

  1463. //            assert(g < 256 && b < 512 && r < 512);

  1464. 

  1465.             b -= 0x100;

  1466.             r -= 0x100;

  1467.             g -= (b + r) >> 2;

  1468.             b += g;

  1469.             r += g;

  1470. 

  1471.             src[x + stride * y] = b + (g << 8) + (r << 16) + (0xFF << 24);

  1472.         }

  1473.     }

  1474. }

  1475. 

  1476. static int decode_slice(AVCodecContext *c, void *arg)

  1477. {

  1478.     FFV1Context *fs  = *(void **)arg;

  1479.     FFV1Context *f   = fs->avctx->priv_data;

  1480.     int width        = fs->slice_width;

  1481.     int height       = fs->slice_height;

  1482.     int x            = fs->slice_x;

  1483.     int y            = fs->slice_y;

  1484.     AVFrame *const p = &f->picture;

  1485. 

  1486.     av_assert1(width && height);

  1487.     if (f->colorspace == 0) {

  1488.         const int chroma_width  = -((-width)  >> f->chroma_h_shift);

  1489.         const int chroma_height = -((-height) >> f->chroma_v_shift);

  1490.         const int cx            = x >> f->chroma_h_shift;

  1491.         const int cy            = y >> f->chroma_v_shift;

  1492. 

  1493.         decode_plane(fs, p->data[0] + x + y * p->linesize[0],

  1494.                      width, height, p->linesize[0], 0);

  1495. 

  1496.         decode_plane(fs, p->data[1] + cx + cy * p->linesize[1],

  1497.                      chroma_width, chroma_height, p->linesize[1], 1);

  1498.         decode_plane(fs, p->data[2] + cx + cy * p->linesize[1],

  1499.                      chroma_width, chroma_height, p->linesize[2], 1);

  1500.     } else {

  1501.         decode_rgb_frame(fs,

  1502.                          (uint32_t *)p->data[0] + x + y * (p->linesize[0] / 4),

  1503.                          width, height, p->linesize[0] / 4);

  1504.     }

  1505. 

  1506.     emms_c();

  1507. 

  1508.     return 0;

  1509. }

  1510. 

  1511. static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale)

  1512. {

  1513.     int v;

  1514.     int i = 0;

  1515.     uint8_t state[CONTEXT_SIZE];

  1516. 

  1517.     memset(state, 128, sizeof(state));

  1518. 

  1519.     for (v = 0; i < 128; v++) {

  1520.         int len = get_symbol(c, state, 0) + 1;

  1521. 

  1522.         if (len + i > 128)

  1523.             return -1;

  1524. 

  1525.         while (len--) {

  1526.             quant_table[i] = scale * v;

  1527.             i++;

  1528.         }

  1529.     }

  1530. 

  1531.     for (i = 1; i < 128; i++)

  1532.         quant_table[256 - i] = -quant_table[i];

  1533.     quant_table[128] = -quant_table[127];

  1534. 

  1535.     return 2 * v - 1;

  1536. }

  1537. 

  1538. static int read_quant_tables(RangeCoder *c,

  1539.                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])

  1540. {

  1541.     int i;

  1542.     int context_count = 1;

  1543. 

  1544.     for (i = 0; i < 5; i++) {

  1545.         context_count *= read_quant_table(c, quant_table[i], context_count);

  1546.         if (context_count > 32768U) {

  1547.             return -1;

  1548.         }

  1549.     }

  1550.     return (context_count + 1) / 2;

  1551. }

  1552. 

  1553. static int read_extra_header(FFV1Context *f)

  1554. {

  1555.     RangeCoder *const c = &f->c;

  1556.     uint8_t state[CONTEXT_SIZE];

  1557.     int i, j, k;

  1558.     uint8_t state2[32][CONTEXT_SIZE];

  1559. 

  1560.     memset(state2, 128, sizeof(state2));

  1561.     memset(state, 128, sizeof(state));

  1562. 

  1563.     ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);

  1564.     ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);

  1565. 

  1566.     f->version = get_symbol(c, state, 0);

  1567.     f->ac      = f->avctx->coder_type = get_symbol(c, state, 0);

  1568.     if (f->ac > 1)

  1569.         for (i = 1; i < 256; i++)

  1570.             f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];

  1571.     f->colorspace                 = get_symbol(c, state, 0); // YUV cs type

  1572.     f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);

  1573.     get_rac(c, state); // no chroma = false

  1574.     f->chroma_h_shift = get_symbol(c, state, 0);

  1575.     f->chroma_v_shift = get_symbol(c, state, 0);

  1576.     get_rac(c, state); // transparency plane

  1577.     f->plane_count  = 2;

  1578.     f->num_h_slices = 1 + get_symbol(c, state, 0);

  1579.     f->num_v_slices = 1 + get_symbol(c, state, 0);

  1580. 

  1581.     if (f->num_h_slices > (unsigned)f->width ||

  1582.         f->num_v_slices > (unsigned)f->height) {

  1583.         av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");

  1584.         return -1;

  1585.     }

  1586. 

  1587.     f->quant_table_count = get_symbol(c, state, 0);

  1588. 

  1589.     if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES)

  1590.         return -1;

  1591. 

  1592.     for (i = 0; i < f->quant_table_count; i++) {

  1593.         f->context_count[i] = read_quant_tables(c, f->quant_tables[i]);

  1594.         if (f->context_count[i] < 0) {

  1595.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1596.             return -1;

  1597.         }

  1598.     }

  1599. 

  1600.     if (allocate_initial_states(f) < 0)

  1601.         return AVERROR(ENOMEM);

  1602. 

  1603.     for (i = 0; i < f->quant_table_count; i++)

  1604.         if (get_rac(c, state))

  1605.             for (j = 0; j < f->context_count[i]; j++)

  1606.                 for (k = 0; k < CONTEXT_SIZE; k++) {

  1607.                     int pred = j ? f->initial_states[i][j - 1][k] : 128;

  1608.                     f->initial_states[i][j][k] =

  1609.                         (pred + get_symbol(c, state2[k], 1)) & 0xFF;

  1610.                 }

  1611.     return 0;

  1612. }

  1613. 

  1614. static int read_header(FFV1Context *f)

  1615. {

  1616.     uint8_t state[CONTEXT_SIZE];

  1617.     int i, j, context_count;

  1618.     RangeCoder *const c = &f->slice_context[0]->c;

  1619. 

  1620.     memset(state, 128, sizeof(state));

  1621. 

  1622.     if (f->version < 2) {

  1623.         f->version = get_symbol(c, state, 0);

  1624.         f->ac      = f->avctx->coder_type = get_symbol(c, state, 0);

  1625.         if (f->ac > 1)

  1626.             for (i = 1; i < 256; i++)

  1627.                 f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];

  1628.         f->colorspace = get_symbol(c, state, 0); // YUV cs type

  1629.         if (f->version > 0)

  1630.             f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);

  1631.         get_rac(c, state); // no chroma = false

  1632.         f->chroma_h_shift = get_symbol(c, state, 0);

  1633.         f->chroma_v_shift = get_symbol(c, state, 0);

  1634.         get_rac(c, state); // transparency plane

  1635.         f->plane_count = 2;

  1636.     }

  1637. 

  1638.     if (f->colorspace == 0) {

  1639.         if (f->avctx->bits_per_raw_sample <= 8) {

  1640.             switch (16 * f->chroma_h_shift + f->chroma_v_shift) {

  1641.             case 0x00:

  1642.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P;

  1643.                 break;

  1644.             case 0x10:

  1645.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P;

  1646.                 break;

  1647.             case 0x11:

  1648.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P;

  1649.                 break;

  1650.             case 0x20:

  1651.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV411P;

  1652.                 break;

  1653.             case 0x22:

  1654.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV410P;

  1655.                 break;

  1656.             default:

  1657.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1658.                 return -1;

  1659.             }

  1660.         } else {

  1661.             switch (16 * f->chroma_h_shift + f->chroma_v_shift) {

  1662.             case 0x00:

  1663.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV444P16;

  1664.                 break;

  1665.             case 0x10:

  1666.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV422P16;

  1667.                 break;

  1668.             case 0x11:

  1669.                 f->avctx->pix_fmt = AV_PIX_FMT_YUV420P16;

  1670.                 break;

  1671.             default:

  1672.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1673.                 return -1;

  1674.             }

  1675.         }

  1676.     } else if (f->colorspace == 1) {

  1677.         if (f->chroma_h_shift || f->chroma_v_shift) {

  1678.             av_log(f->avctx, AV_LOG_ERROR,

  1679.                    "chroma subsampling not supported in this colorspace\n");

  1680.             return -1;

  1681.         }

  1682.         f->avctx->pix_fmt = AV_PIX_FMT_RGB32;

  1683.     } else {

  1684.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  1685.         return -1;

  1686.     }

  1687. 

  1688.     av_dlog(f->avctx, "%d %d %d\n",

  1689.             f->chroma_h_shift, f->chroma_v_shift, f->avctx->pix_fmt);

  1690. 

  1691.     if (f->version < 2) {

  1692.         context_count = read_quant_tables(c, f->quant_table);

  1693.         if (context_count < 0) {

  1694.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1695.             return -1;

  1696.         }

  1697.     } else {

  1698.         f->slice_count = get_symbol(c, state, 0);

  1699.         if (f->slice_count > (unsigned)MAX_SLICES)

  1700.             return -1;

  1701.     }

  1702. 

  1703.     for (j = 0; j < f->slice_count; j++) {

  1704.         FFV1Context *fs = f->slice_context[j];

  1705.         fs->ac = f->ac;

  1706. 

  1707.         if (f->version >= 2) {

  1708.             fs->slice_x      = get_symbol(c, state, 0) * f->width;

  1709.             fs->slice_y      = get_symbol(c, state, 0) * f->height;

  1710.             fs->slice_width  = (get_symbol(c, state, 0) + 1) * f->width  + fs->slice_x;

  1711.             fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;

  1712. 

  1713.             fs->slice_x     /= f->num_h_slices;

  1714.             fs->slice_y     /= f->num_v_slices;

  1715.             fs->slice_width  = fs->slice_width  / f->num_h_slices - fs->slice_x;

  1716.             fs->slice_height = fs->slice_height / f->num_v_slices - fs->slice_y;

  1717.             if ((unsigned)fs->slice_width  > f->width ||

  1718.                 (unsigned)fs->slice_height > f->height)

  1719.                 return -1;

  1720.             if ((unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width ||

  1721.                 (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

  1722.                 return -1;

  1723.         }

  1724. 

  1725.         for (i = 0; i < f->plane_count; i++) {

  1726.             PlaneContext *const p = &fs->plane[i];

  1727. 

  1728.             if (f->version >= 2) {

  1729.                 int idx = get_symbol(c, state, 0);

  1730.                 if (idx > (unsigned)f->quant_table_count) {

  1731.                     av_log(f->avctx, AV_LOG_ERROR,

  1732.                            "quant_table_index out of range\n");

  1733.                     return -1;

  1734.                 }

  1735.                 p->quant_table_index = idx;

  1736.                 memcpy(p->quant_table, f->quant_tables[idx],

  1737.                        sizeof(p->quant_table));

  1738.                 context_count = f->context_count[idx];

  1739.             } else {

  1740.                 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));

  1741.             }

  1742. 

  1743.             if (p->context_count < context_count) {

  1744.                 av_freep(&p->state);

  1745.                 av_freep(&p->vlc_state);

  1746.             }

  1747.             p->context_count = context_count;

  1748.         }

  1749.     }

  1750. 

  1751.     return 0;

  1752. }

  1753. 

  1754. static av_cold int decode_init(AVCodecContext *avctx)

  1755. {

  1756.     FFV1Context *f = avctx->priv_data;

  1757. 

  1758.     common_init(avctx);

  1759. 

  1760.     if (avctx->extradata && read_extra_header(f) < 0)

  1761.         return -1;

  1762. 

  1763.     if (init_slice_contexts(f) < 0)

  1764.         return -1;

  1765. 

  1766.     return 0;

  1767. }

  1768. 

  1769. static int decode_frame(AVCodecContext *avctx, void *data,

  1770.                         int *data_size, AVPacket *avpkt)

  1771. {

  1772.     const uint8_t *buf  = avpkt->data;

  1773.     int buf_size        = avpkt->size;

  1774.     FFV1Context *f      = avctx->priv_data;

  1775.     RangeCoder *const c = &f->slice_context[0]->c;

  1776.     AVFrame *const p    = &f->picture;

  1777.     int bytes_read, i;

  1778.     uint8_t keystate = 128;

  1779.     const uint8_t *buf_p;

  1780. 

  1781.     AVFrame *picture = data;

  1782. 

  1783.     /* release previously stored data */

  1784.     if (p->data[0])

  1785.         avctx->release_buffer(avctx, p);

  1786. 

  1787.     ff_init_range_decoder(c, buf, buf_size);

  1788.     ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);

  1789. 

  1790.     p->pict_type = AV_PICTURE_TYPE_I; // FIXME: I vs. P

  1791.     if (get_rac(c, &keystate)) {

  1792.         p->key_frame = 1;

  1793.         if (read_header(f) < 0)

  1794.             return -1;

  1795.         if (init_slice_state(f) < 0)

  1796.             return -1;

  1797. 

  1798.         clear_state(f);

  1799.     } else {

  1800.         p->key_frame = 0;

  1801.     }

  1802.     if (f->ac > 1) {

  1803.         int i;

  1804.         for (i = 1; i < 256; i++) {

  1805.             c->one_state[i]        = f->state_transition[i];

  1806.             c->zero_state[256 - i] = 256 - c->one_state[i];

  1807.         }

  1808.     }

  1809. 

  1810.     p->reference = 0;

  1811.     if (avctx->get_buffer(avctx, p) < 0) {

  1812.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1813.         return -1;

  1814.     }

  1815. 

  1816.     if (avctx->debug & FF_DEBUG_PICT_INFO)

  1817.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  1818. 

  1819.     if (!f->ac) {

  1820.         bytes_read = c->bytestream - c->bytestream_start - 1;

  1821.         if (bytes_read == 0)

  1822.             av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); // FIXME

  1823.         init_get_bits(&f->slice_context[0]->gb, buf + bytes_read,

  1824.                       (buf_size - bytes_read) * 8);

  1825.     } else {

  1826.         bytes_read = 0; /* avoid warning */

  1827.     }

  1828. 

  1829.     buf_p = buf + buf_size;

  1830.     for (i = f->slice_count - 1; i > 0; i--) {

  1831.         FFV1Context *fs = f->slice_context[i];

  1832.         int v           = AV_RB24(buf_p - 3) + 3;

  1833.         if (buf_p - buf <= v) {

  1834.             av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");

  1835.             return -1;

  1836.         }

  1837.         buf_p -= v;

  1838.         if (fs->ac)

  1839.             ff_init_range_decoder(&fs->c, buf_p, v);

  1840.         else

  1841.             init_get_bits(&fs->gb, buf_p, v * 8);

  1842.     }

  1843. 

  1844.     avctx->execute(avctx, decode_slice, &f->slice_context[0],

  1845.                    NULL, f->slice_count, sizeof(void *));

  1846.     f->picture_number++;

  1847. 

  1848.     *picture   = *p;

  1849.     *data_size = sizeof(AVFrame);

  1850. 

  1851.     return buf_size;

  1852. }

  1853. 

  1854. AVCodec ff_ffv1_decoder = {

  1855.     .name           = "ffv1",

  1856.     .type           = AVMEDIA_TYPE_VIDEO,

  1857.     .id             = AV_CODEC_ID_FFV1,

  1858.     .priv_data_size = sizeof(FFV1Context),

  1859.     .init           = decode_init,

  1860.     .close          = common_end,

  1861.     .decode         = decode_frame,

  1862.     .capabilities   = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ |

  1863.                       CODEC_CAP_SLICE_THREADS,

  1864.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1865. };

  1866. 

  1867. #if CONFIG_FFV1_ENCODER

  1868. AVCodec ff_ffv1_encoder = {

  1869.     .name           = "ffv1",

  1870.     .type           = AVMEDIA_TYPE_VIDEO,

  1871.     .id             = AV_CODEC_ID_FFV1,

  1872.     .priv_data_size = sizeof(FFV1Context),

  1873.     .init           = encode_init,

  1874.     .encode2        = encode_frame,

  1875.     .close          = common_end,

  1876.     .capabilities   = CODEC_CAP_SLICE_THREADS,

  1877.     .pix_fmts       = (const enum AVPixelFormat[]) {

  1878.         AV_PIX_FMT_YUV420P,   AV_PIX_FMT_YUV422P,   AV_PIX_FMT_YUV444P,

  1879.         AV_PIX_FMT_YUV411P,   AV_PIX_FMT_YUV410P,

  1880.         AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,

  1881.         AV_PIX_FMT_RGB32,

  1882.         AV_PIX_FMT_NONE

  1883.     },

  1884.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1885. };

  1886. #endif