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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 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 chroma_planes;

  169.     int transparency;

  170.     int flags;

  171.     int picture_number;

  172.     AVFrame picture;

  173.     int plane_count;

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

  175.     PlaneContext plane[MAX_PLANES];

  176.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

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

  178.     int context_count[MAX_QUANT_TABLES];

  179.     uint8_t state_transition[256];

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

  181.     int run_index;

  182.     int colorspace;

  183.     int16_t *sample_buffer;

  184.     int gob_count;

  185.     int packed_at_lsb;

  186. 

  187.     int quant_table_count;

  188. 

  189.     DSPContext dsp;

  190. 

  191.     struct FFV1Context *slice_context[MAX_SLICES];

  192.     int slice_count;

  193.     int num_v_slices;

  194.     int num_h_slices;

  195.     int slice_width;

  196.     int slice_height;

  197.     int slice_x;

  198.     int slice_y;

  199.     int bits_per_raw_sample;

  200. }FFV1Context;

  201. 

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

  203.     if(bits==8)

  204.         diff= (int8_t)diff;

  205.     else{

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

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

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

  209.     }

  210. 

  211.     return diff;

  212. }

  213. 

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

  215. {

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

  217.     const int  T= last[ 0];

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

  219. 

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

  221. }

  222. 

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

  224.                               int16_t *last, int16_t *last2)

  225. {

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

  227.     const int  T= last[ 0];

  228.     const int RT= last[ 1];

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

  230. 

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

  232.         const int TT= last2[0];

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

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

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

  236.     }else

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

  238. }

  239. 

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

  241.     int i,j,k,m;

  242.     double l2tab[256];

  243. 

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

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

  246. 

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

  248.         double best_len[256];

  249.         double p= i/256.0;

  250. 

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

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

  253. 

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

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

  256.             double len=0;

  257.             occ[j]=1.0;

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

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

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

  261.                     if(occ[m]){

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

  263.                                       + (1-p)*l2tab[256-m]);

  264.                     }

  265.                 }

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

  267.                     best_len[k]= len;

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

  269.                 }

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

  271.                     if(occ[m]){

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

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

  274.                     }

  275.                 }

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

  277.             }

  278.         }

  279.     }

  280. }

  281. 

  282. 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]){

  283.     int i;

  284. 

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

  286. do{\

  287.     if(rc_stat){\

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

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

  290.     }\

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

  292. }while(0)

  293. 

  294.     if(v){

  295.         const int a= FFABS(v);

  296.         const int e= av_log2(a);

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

  298.         if(e<=9){

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

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

  301.             }

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

  303. 

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

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

  306.             }

  307. 

  308.             if(is_signed)

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

  310.         }else{

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

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

  313.             }

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

  315. 

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

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

  318.             }

  319. 

  320.             if(is_signed)

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

  322.         }

  323.     }else{

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

  325.     }

  326. #undef put_rac

  327. }

  328. 

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

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

  331. }

  332. 

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

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

  335.         return 0;

  336.     else{

  337.         int i, e, a;

  338.         e= 0;

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

  340.             e++;

  341.         }

  342. 

  343.         a= 1;

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

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

  346.         }

  347. 

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

  349.         return (a^e)-e;

  350.     }

  351. }

  352. 

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

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

  355. }

  356. 

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

  358.     int drift= state->drift;

  359.     int count= state->count;

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

  361.     drift += v;

  362. 

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

  364.         count >>= 1;

  365.         drift >>= 1;

  366.         state->error_sum >>= 1;

  367.     }

  368.     count++;

  369. 

  370.     if(drift <= -count){

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

  372. 

  373.         drift += count;

  374.         if(drift <= -count)

  375.             drift= -count + 1;

  376.     }else if(drift > 0){

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

  378. 

  379.         drift -= count;

  380.         if(drift > 0)

  381.             drift= 0;

  382.     }

  383. 

  384.     state->drift= drift;

  385.     state->count= count;

  386. }

  387. 

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

  389.     int i, k, code;

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

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

  392. 

  393.     i= state->count;

  394.     k=0;

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

  396.         k++;

  397.         i += i;

  398.     }

  399. 

  400.     assert(k<=8);

  401. 

  402. #if 0 // JPEG LS

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

  404.     else                                         code= v;

  405. #else

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

  407. #endif

  408. 

  409. //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);

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

  411. 

  412.     update_vlc_state(state, v);

  413. }

  414. 

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

  416.     int k, i, v, ret;

  417. 

  418.     i= state->count;

  419.     k=0;

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

  421.         k++;

  422.         i += i;

  423.     }

  424. 

  425.     assert(k<=8);

  426. 

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

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

  429. 

  430. #if 0 // JPEG LS

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

  432. #else

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

  434. #endif

  435. 

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

  437. 

  438.     update_vlc_state(state, v);

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

  440.     return ret;

  441. }

  442. 

  443. #if CONFIG_FFV1_ENCODER

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

  445.                                         int16_t *sample[2],

  446.                                         int plane_index, int bits)

  447. {

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

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

  450.     int x;

  451.     int run_index= s->run_index;

  452.     int run_count=0;

  453.     int run_mode=0;

  454. 

  455.     if(s->ac){

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

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

  458.             return -1;

  459.         }

  460.     }else{

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

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

  463.             return -1;

  464.         }

  465.     }

  466. 

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

  468.         int diff, context;

  469. 

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

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

  472. 

  473.         if(context < 0){

  474.             context = -context;

  475.             diff= -diff;

  476.         }

  477. 

  478.         diff= fold(diff, bits);

  479. 

  480.         if(s->ac){

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

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

  483.             }else{

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

  485.             }

  486.         }else{

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

  488. 

  489.             if(run_mode){

  490. 

  491.                 if(diff){

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

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

  494.                         run_index++;

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

  496.                     }

  497. 

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

  499.                     if(run_index) run_index--;

  500.                     run_count=0;

  501.                     run_mode=0;

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

  503.                 }else{

  504.                     run_count++;

  505.                 }

  506.             }

  507. 

  508. //            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));

  509. 

  510.             if(run_mode == 0)

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

  512.         }

  513.     }

  514.     if(run_mode){

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

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

  517.             run_index++;

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

  519.         }

  520. 

  521.         if(run_count)

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

  523.     }

  524.     s->run_index= run_index;

  525. 

  526.     return 0;

  527. }

  528. 

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

  530.     int x,y,i;

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

  532.     int16_t *sample[3];

  533.     s->run_index=0;

  534. 

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

  536. 

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

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

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

  540. 

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

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

  543. //{START_TIMER

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

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

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

  547.             }

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

  549.         }else{

  550.             if(s->packed_at_lsb){

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

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

  553.                 }

  554.             }else{

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

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

  557.                 }

  558.             }

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

  560.         }

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

  562.     }

  563. }

  564. 

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

  566.     int x, y, p, i;

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

  568.     int16_t *sample[4][3];

  569.     s->run_index=0;

  570. 

  571.     memset(s->sample_buffer, 0, ring_size*4*(w+6)*sizeof(*s->sample_buffer));

  572. 

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

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

  575.             for(p=0; p<4; p++)

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

  577. 

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

  579.             unsigned v= src[x + stride*y];

  580.             int b= v&0xFF;

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

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

  583.             int a=  v>>24;

  584. 

  585.             b -= g;

  586.             r -= g;

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

  588.             b += 0x100;

  589.             r += 0x100;

  590. 

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

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

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

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

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

  596.             sample[3][0][x]= a;

  597.         }

  598.         for(p=0; p<3 + s->transparency; p++){

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

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

  601.             encode_line(s, w, sample[p], (p+1)/2, 9);

  602.         }

  603.     }

  604. }

  605. 

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

  607.     int last=0;

  608.     int i;

  609.     uint8_t state[CONTEXT_SIZE];

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

  611. 

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

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

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

  615.             last= i;

  616.         }

  617.     }

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

  619. }

  620. 

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

  622.     int i;

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

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

  625. }

  626. 

  627. static void write_header(FFV1Context *f){

  628.     uint8_t state[CONTEXT_SIZE];

  629.     int i, j;

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

  631. 

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

  633. 

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

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

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

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

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

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

  640.             }

  641.         }

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

  643.         if(f->version>0)

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

  645.         put_rac(c, state, f->chroma_planes);

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

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

  648.         put_rac(c, state, f->transparency);

  649. 

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

  651.     }else{

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

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

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

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

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

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

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

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

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

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

  662.             }

  663.         }

  664.     }

  665. }

  666. #endif /* CONFIG_FFV1_ENCODER */

  667. 

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

  669.     FFV1Context *s = avctx->priv_data;

  670. 

  671.     s->avctx= avctx;

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

  673. 

  674.     avcodec_get_frame_defaults(&s->picture);

  675. 

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

  677. 

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

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

  680. 

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

  682.     //defaults

  683.     s->num_h_slices=1;

  684.     s->num_v_slices=1;

  685. 

  686. 

  687.     return 0;

  688. }

  689. 

  690. static int init_slice_state(FFV1Context *f){

  691.     int i, j;

  692. 

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

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

  695.         fs->plane_count= f->plane_count;

  696.         fs->transparency= f->transparency;

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

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

  699. 

  700.             if(fs->ac){

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

  702.                 if(!p->    state)

  703.                     return AVERROR(ENOMEM);

  704.             }else{

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

  706.                 if(!p->vlc_state)

  707.                     return AVERROR(ENOMEM);

  708.             }

  709.         }

  710. 

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

  712.             //FIXME only redo if state_transition changed

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

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

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

  716.             }

  717.         }

  718.     }

  719. 

  720.     return 0;

  721. }

  722. 

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

  724.     int i;

  725. 

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

  727. 

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

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

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

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

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

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

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

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

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

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

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

  739. 

  740.         fs->slice_width = sxe - sxs;

  741.         fs->slice_height= sye - sys;

  742.         fs->slice_x     = sxs;

  743.         fs->slice_y     = sys;

  744. 

  745.         fs->sample_buffer = av_malloc(3*4 * (fs->width+6) * sizeof(*fs->sample_buffer));

  746.         if (!fs->sample_buffer)

  747.             return AVERROR(ENOMEM);

  748.     }

  749.     return 0;

  750. }

  751. 

  752. static int allocate_initial_states(FFV1Context *f){

  753.     int i;

  754. 

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

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

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

  758.             return AVERROR(ENOMEM);

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

  760.     }

  761.     return 0;

  762. }

  763. 

  764. #if CONFIG_FFV1_ENCODER

  765. static int write_extra_header(FFV1Context *f){

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

  767.     uint8_t state[CONTEXT_SIZE];

  768.     int i, j, k;

  769.     uint8_t state2[32][CONTEXT_SIZE];

  770. 

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

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

  773. 

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

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

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

  777. 

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

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

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

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

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

  783.         }

  784.     }

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

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

  787.     put_rac(c, state, f->chroma_planes);

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

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

  790.     put_rac(c, state, f->transparency);

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

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

  793. 

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

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

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

  797. 

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

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

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

  801.                 break;

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

  803.             put_rac(c, state, 1);

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

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

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

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

  808.                 }

  809.             }

  810.         }else{

  811.             put_rac(c, state, 0);

  812.         }

  813.     }

  814. 

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

  816. 

  817.     return 0;

  818. }

  819. 

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

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

  822. 

  823.     do{

  824.         changed=0;

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

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

  827. #define COST(old, new) \

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

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

  830. 

  831. #define COST2(old, new) \

  832.     COST(old, new)\

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

  834. 

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

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

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

  838.                     int j;

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

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

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

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

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

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

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

  846.                     }

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

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

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

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

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

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

  853.                         }

  854.                     }

  855.                     print=changed=1;

  856.                 }

  857.             }

  858.         }

  859.     }while(changed);

  860.     return print;

  861. }

  862. 

  863. static av_cold int encode_init(AVCodecContext *avctx)

  864. {

  865.     FFV1Context *s = avctx->priv_data;

  866.     int i, j, k, m;

  867. 

  868.     common_init(avctx);

  869. 

  870.     s->version=0;

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

  872. 

  873.     if(s->ac>1)

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

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

  876. 

  877.     s->plane_count=3;

  878.     switch(avctx->pix_fmt){

  879.     case PIX_FMT_YUV420P9:

  880.         if (!avctx->bits_per_raw_sample)

  881.             s->bits_per_raw_sample = 9;

  882.     case PIX_FMT_YUV420P10:

  883.     case PIX_FMT_YUV422P10:

  884.         s->packed_at_lsb = 1;

  885.         if (!avctx->bits_per_raw_sample && !s->bits_per_raw_sample)

  886.             s->bits_per_raw_sample = 10;

  887.     case PIX_FMT_GRAY16:

  888.     case PIX_FMT_YUV444P16:

  889.     case PIX_FMT_YUV422P16:

  890.     case PIX_FMT_YUV420P16:

  891.         if (!avctx->bits_per_raw_sample && !s->bits_per_raw_sample) {

  892.             s->bits_per_raw_sample = 16;

  893.         } else if (!s->bits_per_raw_sample){

  894.             s->bits_per_raw_sample = avctx->bits_per_raw_sample;

  895.         }

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

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

  898.             return -1;

  899.         }

  900.         if(!s->ac){

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

  902.             return -1;

  903.         }

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

  905.     case PIX_FMT_YUV444P:

  906.     case PIX_FMT_YUV440P:

  907.     case PIX_FMT_YUV422P:

  908.     case PIX_FMT_YUV420P:

  909.     case PIX_FMT_YUV411P:

  910.     case PIX_FMT_YUV410P:

  911.         s->chroma_planes= avctx->pix_fmt == PIX_FMT_GRAY16 ? 0 : 1;

  912.         s->colorspace= 0;

  913.         break;

  914.     case PIX_FMT_YUVA444P:

  915.     case PIX_FMT_YUVA420P:

  916.         s->chroma_planes= 1;

  917.         s->colorspace= 0;

  918.         s->transparency= 1;

  919.         break;

  920.     case PIX_FMT_RGB32:

  921.         s->colorspace= 1;

  922.         s->transparency= 1;

  923.         break;

  924.     case PIX_FMT_0RGB32:

  925.         s->colorspace= 1;

  926.         break;

  927.     default:

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

  929.         return -1;

  930.     }

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

  932.         s->quant_table_count=2;

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

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

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

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

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

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

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

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

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

  942.         }else{

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

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

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

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

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

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

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

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

  951.         }

  952.     }

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

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

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

  956. 

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

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

  959. 

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

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

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

  963.     }

  964. 

  965.     if(allocate_initial_states(s) < 0)

  966.         return AVERROR(ENOMEM);

  967. 

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

  969.     if(!s->transparency)

  970.         s->plane_count= 2;

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

  972. 

  973.     s->picture_number=0;

  974. 

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

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

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

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

  979.                 return AVERROR(ENOMEM);

  980.         }

  981.     }

  982.     if(avctx->stats_in){

  983.         char *p= avctx->stats_in;

  984.         uint8_t best_state[256][256];

  985.         int gob_count=0;

  986.         char *next;

  987. 

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

  989. 

  990.         for(;;){

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

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

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

  994.                     if(next==p){

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

  996.                         return -1;

  997.                     }

  998.                     p=next;

  999.                 }

  1000.             }

  1001.             for(i=0; i<s->quant_table_count; i++){

  1002.                 for(j=0; j<s->context_count[i]; j++){

  1003.                     for(k=0; k<32; k++){

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

  1005.                             s->rc_stat2[i][j][k][m]= strtol(p, &next, 0);

  1006.                             if(next==p){

  1007.                                 av_log(avctx, AV_LOG_ERROR, "2Pass file invalid at %d %d %d %d [%s]\n", i,j,k,m,p);

  1008.                                 return -1;

  1009.                             }

  1010.                             p=next;

  1011.                         }

  1012.                     }

  1013.                 }

  1014.             }

  1015.             gob_count= strtol(p, &next, 0);

  1016.             if(next==p || gob_count <0){

  1017.                 av_log(avctx, AV_LOG_ERROR, "2Pass file invalid\n");

  1018.                 return -1;

  1019.             }

  1020.             p=next;

  1021.             while(*p=='\n' || *p==' ') p++;

  1022.             if(p[0]==0) break;

  1023.         }

  1024.         sort_stt(s, s->state_transition);

  1025. 

  1026.         find_best_state(best_state, s->state_transition);

  1027. 

  1028.         for(i=0; i<s->quant_table_count; i++){

  1029.             for(j=0; j<s->context_count[i]; j++){

  1030.                 for(k=0; k<32; k++){

  1031.                     double p= 128;

  1032.                     if(s->rc_stat2[i][j][k][0]+s->rc_stat2[i][j][k][1]){

  1033.                         p=256.0*s->rc_stat2[i][j][k][1] / (s->rc_stat2[i][j][k][0]+s->rc_stat2[i][j][k][1]);

  1034.                     }

  1035.                     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)];

  1036.                 }

  1037.             }

  1038.         }

  1039.     }

  1040. 

  1041.     if(s->version>1){

  1042.         s->num_h_slices=2;

  1043.         s->num_v_slices=2;

  1044.         write_extra_header(s);

  1045.     }

  1046. 

  1047.     if(init_slice_contexts(s) < 0)

  1048.         return -1;

  1049.     if(init_slice_state(s) < 0)

  1050.         return -1;

  1051. 

  1052. #define STATS_OUT_SIZE 1024*1024*6

  1053.     if(avctx->flags & CODEC_FLAG_PASS1){

  1054.         avctx->stats_out= av_mallocz(STATS_OUT_SIZE);

  1055.         for(i=0; i<s->quant_table_count; i++){

  1056.             for(j=0; j<s->slice_count; j++){

  1057.                 FFV1Context *sf= s->slice_context[j];

  1058.                 av_assert0(!sf->rc_stat2[i]);

  1059.                 sf->rc_stat2[i]= av_mallocz(s->context_count[i]*sizeof(*sf->rc_stat2[i]));

  1060.                 if(!sf->rc_stat2[i])

  1061.                     return AVERROR(ENOMEM);

  1062.             }

  1063.         }

  1064.     }

  1065. 

  1066.     return 0;

  1067. }

  1068. #endif /* CONFIG_FFV1_ENCODER */

  1069. 

  1070. 

  1071. static void clear_state(FFV1Context *f){

  1072.     int i, si, j;

  1073. 

  1074.     for(si=0; si<f->slice_count; si++){

  1075.         FFV1Context *fs= f->slice_context[si];

  1076.         for(i=0; i<f->plane_count; i++){

  1077.             PlaneContext *p= &fs->plane[i];

  1078. 

  1079.             p->interlace_bit_state[0]= 128;

  1080.             p->interlace_bit_state[1]= 128;

  1081. 

  1082.             if(fs->ac){

  1083.                 if(f->initial_states[p->quant_table_index]){

  1084.                     memcpy(p->state, f->initial_states[p->quant_table_index], CONTEXT_SIZE*p->context_count);

  1085.                 }else

  1086.                 memset(p->state, 128, CONTEXT_SIZE*p->context_count);

  1087.             }else{

  1088.                 for(j=0; j<p->context_count; j++){

  1089.                     p->vlc_state[j].drift= 0;

  1090.                     p->vlc_state[j].error_sum= 4; //FFMAX((RANGE + 32)/64, 2);

  1091.                     p->vlc_state[j].bias= 0;

  1092.                     p->vlc_state[j].count= 1;

  1093.                 }

  1094.             }

  1095.         }

  1096.     }

  1097. }

  1098. 

  1099. #if CONFIG_FFV1_ENCODER

  1100. static int encode_slice(AVCodecContext *c, void *arg){

  1101.     FFV1Context *fs= *(void**)arg;

  1102.     FFV1Context *f= fs->avctx->priv_data;

  1103.     int width = fs->slice_width;

  1104.     int height= fs->slice_height;

  1105.     int x= fs->slice_x;

  1106.     int y= fs->slice_y;

  1107.     AVFrame * const p= &f->picture;

  1108.     const int ps= (f->bits_per_raw_sample>8)+1;

  1109. 

  1110.     if(f->colorspace==0){

  1111.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1112.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1113.         const int cx= x>>f->chroma_h_shift;

  1114.         const int cy= y>>f->chroma_v_shift;

  1115. 

  1116.         encode_plane(fs, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0);

  1117. 

  1118.         if (f->chroma_planes){

  1119.             encode_plane(fs, p->data[1] + ps*cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  1120.             encode_plane(fs, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);

  1121.         }

  1122.         if (fs->transparency)

  1123.             encode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], 2);

  1124.     }else{

  1125.         encode_rgb_frame(fs, (uint32_t*)(p->data[0]) + ps*x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1126.     }

  1127.     emms_c();

  1128. 

  1129.     return 0;

  1130. }

  1131. 

  1132. static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

  1133.     FFV1Context *f = avctx->priv_data;

  1134.     RangeCoder * const c= &f->slice_context[0]->c;

  1135.     AVFrame *pict = data;

  1136.     AVFrame * const p= &f->picture;

  1137.     int used_count= 0;

  1138.     uint8_t keystate=128;

  1139.     uint8_t *buf_p;

  1140.     int i;

  1141. 

  1142.     ff_init_range_encoder(c, buf, buf_size);

  1143.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1144. 

  1145.     *p = *pict;

  1146.     p->pict_type= AV_PICTURE_TYPE_I;

  1147. 

  1148.     if(avctx->gop_size==0 || f->picture_number % avctx->gop_size == 0){

  1149.         put_rac(c, &keystate, 1);

  1150.         p->key_frame= 1;

  1151.         f->gob_count++;

  1152.         write_header(f);

  1153.         clear_state(f);

  1154.     }else{

  1155.         put_rac(c, &keystate, 0);

  1156.         p->key_frame= 0;

  1157.     }

  1158. 

  1159.     if(!f->ac){

  1160.         used_count += ff_rac_terminate(c);

  1161. //printf("pos=%d\n", used_count);

  1162.         init_put_bits(&f->slice_context[0]->pb, buf + used_count, buf_size - used_count);

  1163.     }else if (f->ac>1){

  1164.         int i;

  1165.         for(i=1; i<256; i++){

  1166.             c->one_state[i]= f->state_transition[i];

  1167.             c->zero_state[256-i]= 256-c->one_state[i];

  1168.         }

  1169.     }

  1170. 

  1171.     for(i=1; i<f->slice_count; i++){

  1172.         FFV1Context *fs= f->slice_context[i];

  1173.         uint8_t *start= buf + (buf_size-used_count)*i/f->slice_count;

  1174.         int len= buf_size/f->slice_count;

  1175. 

  1176.         if(fs->ac){

  1177.             ff_init_range_encoder(&fs->c, start, len);

  1178.         }else{

  1179.             init_put_bits(&fs->pb, start, len);

  1180.         }

  1181.     }

  1182.     avctx->execute(avctx, encode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1183. 

  1184.     buf_p=buf;

  1185.     for(i=0; i<f->slice_count; i++){

  1186.         FFV1Context *fs= f->slice_context[i];

  1187.         int bytes;

  1188. 

  1189.         if(fs->ac){

  1190.             uint8_t state=128;

  1191.             put_rac(&fs->c, &state, 0);

  1192.             bytes= ff_rac_terminate(&fs->c);

  1193.         }else{

  1194.             flush_put_bits(&fs->pb); //nicer padding FIXME

  1195.             bytes= used_count + (put_bits_count(&fs->pb)+7)/8;

  1196.             used_count= 0;

  1197.         }

  1198.         if(i>0){

  1199.             av_assert0(bytes < buf_size/f->slice_count);

  1200.             memmove(buf_p, fs->ac ? fs->c.bytestream_start : fs->pb.buf, bytes);

  1201.             av_assert0(bytes < (1<<24));

  1202.             AV_WB24(buf_p+bytes, bytes);

  1203.             bytes+=3;

  1204.         }

  1205.         buf_p += bytes;

  1206.     }

  1207. 

  1208.     if((avctx->flags&CODEC_FLAG_PASS1) && (f->picture_number&31)==0){

  1209.         int j, k, m;

  1210.         char *p= avctx->stats_out;

  1211.         char *end= p + STATS_OUT_SIZE;

  1212. 

  1213.         memset(f->rc_stat, 0, sizeof(f->rc_stat));

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

  1215.             memset(f->rc_stat2[i], 0, f->context_count[i]*sizeof(*f->rc_stat2[i]));

  1216. 

  1217.         for(j=0; j<f->slice_count; j++){

  1218.             FFV1Context *fs= f->slice_context[j];

  1219.             for(i=0; i<256; i++){

  1220.                 f->rc_stat[i][0] += fs->rc_stat[i][0];

  1221.                 f->rc_stat[i][1] += fs->rc_stat[i][1];

  1222.             }

  1223.             for(i=0; i<f->quant_table_count; i++){

  1224.                 for(k=0; k<f->context_count[i]; k++){

  1225.                     for(m=0; m<32; m++){

  1226.                         f->rc_stat2[i][k][m][0] += fs->rc_stat2[i][k][m][0];

  1227.                         f->rc_stat2[i][k][m][1] += fs->rc_stat2[i][k][m][1];

  1228.                     }

  1229.                 }

  1230.             }

  1231.         }

  1232. 

  1233.         for(j=0; j<256; j++){

  1234.             snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat[j][0], f->rc_stat[j][1]);

  1235.             p+= strlen(p);

  1236.         }

  1237.         snprintf(p, end-p, "\n");

  1238. 

  1239.         for(i=0; i<f->quant_table_count; i++){

  1240.             for(j=0; j<f->context_count[i]; j++){

  1241.                 for(m=0; m<32; m++){

  1242.                     snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat2[i][j][m][0], f->rc_stat2[i][j][m][1]);

  1243.                     p+= strlen(p);

  1244.                 }

  1245.             }

  1246.         }

  1247.         snprintf(p, end-p, "%d\n", f->gob_count);

  1248.     } else if(avctx->flags&CODEC_FLAG_PASS1)

  1249.         avctx->stats_out[0] = '\0';

  1250. 

  1251.     f->picture_number++;

  1252.     return buf_p-buf;

  1253. }

  1254. #endif /* CONFIG_FFV1_ENCODER */

  1255. 

  1256. static av_cold int common_end(AVCodecContext *avctx){

  1257.     FFV1Context *s = avctx->priv_data;

  1258.     int i, j;

  1259. 

  1260.     if (avctx->codec->decode && s->picture.data[0])

  1261.         avctx->release_buffer(avctx, &s->picture);

  1262. 

  1263.     for(j=0; j<s->slice_count; j++){

  1264.         FFV1Context *fs= s->slice_context[j];

  1265.         for(i=0; i<s->plane_count; i++){

  1266.             PlaneContext *p= &fs->plane[i];

  1267. 

  1268.             av_freep(&p->state);

  1269.             av_freep(&p->vlc_state);

  1270.         }

  1271.         av_freep(&fs->sample_buffer);

  1272.     }

  1273. 

  1274.     av_freep(&avctx->stats_out);

  1275.     for(j=0; j<s->quant_table_count; j++){

  1276.         av_freep(&s->initial_states[j]);

  1277.         for(i=0; i<s->slice_count; i++){

  1278.             FFV1Context *sf= s->slice_context[i];

  1279.             av_freep(&sf->rc_stat2[j]);

  1280.         }

  1281.         av_freep(&s->rc_stat2[j]);

  1282.     }

  1283. 

  1284.     for(i=0; i<s->slice_count; i++){

  1285.         av_freep(&s->slice_context[i]);

  1286.     }

  1287. 

  1288.     return 0;

  1289. }

  1290. 

  1291. static av_always_inline void decode_line(FFV1Context *s, int w,

  1292.                                          int16_t *sample[2],

  1293.                                          int plane_index, int bits)

  1294. {

  1295.     PlaneContext * const p= &s->plane[plane_index];

  1296.     RangeCoder * const c= &s->c;

  1297.     int x;

  1298.     int run_count=0;

  1299.     int run_mode=0;

  1300.     int run_index= s->run_index;

  1301. 

  1302.     for(x=0; x<w; x++){

  1303.         int diff, context, sign;

  1304. 

  1305.         context= get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);

  1306.         if(context < 0){

  1307.             context= -context;

  1308.             sign=1;

  1309.         }else

  1310.             sign=0;

  1311. 

  1312.         av_assert2(context < p->context_count);

  1313. 

  1314.         if(s->ac){

  1315.             diff= get_symbol_inline(c, p->state[context], 1);

  1316.         }else{

  1317.             if(context == 0 && run_mode==0) run_mode=1;

  1318. 

  1319.             if(run_mode){

  1320.                 if(run_count==0 && run_mode==1){

  1321.                     if(get_bits1(&s->gb)){

  1322.                         run_count = 1<<ff_log2_run[run_index];

  1323.                         if(x + run_count <= w) run_index++;

  1324.                     }else{

  1325.                         if(ff_log2_run[run_index]) run_count = get_bits(&s->gb, ff_log2_run[run_index]);

  1326.                         else run_count=0;

  1327.                         if(run_index) run_index--;

  1328.                         run_mode=2;

  1329.                     }

  1330.                 }

  1331.                 run_count--;

  1332.                 if(run_count < 0){

  1333.                     run_mode=0;

  1334.                     run_count=0;

  1335.                     diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1336.                     if(diff>=0) diff++;

  1337.                 }else

  1338.                     diff=0;

  1339.             }else

  1340.                 diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1341. 

  1342. //            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));

  1343.         }

  1344. 

  1345.         if(sign) diff= -diff;

  1346. 

  1347.         sample[1][x]= (predict(sample[1] + x, sample[0] + x) + diff) & ((1<<bits)-1);

  1348.     }

  1349.     s->run_index= run_index;

  1350. }

  1351. 

  1352. static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){

  1353.     int x, y;

  1354.     int16_t *sample[2];

  1355.     sample[0]=s->sample_buffer    +3;

  1356.     sample[1]=s->sample_buffer+w+6+3;

  1357. 

  1358.     s->run_index=0;

  1359. 

  1360.     memset(s->sample_buffer, 0, 2*(w+6)*sizeof(*s->sample_buffer));

  1361. 

  1362.     for(y=0; y<h; y++){

  1363.         int16_t *temp = sample[0]; //FIXME try a normal buffer

  1364. 

  1365.         sample[0]= sample[1];

  1366.         sample[1]= temp;

  1367. 

  1368.         sample[1][-1]= sample[0][0  ];

  1369.         sample[0][ w]= sample[0][w-1];

  1370. 

  1371. //{START_TIMER

  1372.         if(s->avctx->bits_per_raw_sample <= 8){

  1373.             decode_line(s, w, sample, plane_index, 8);

  1374.             for(x=0; x<w; x++){

  1375.                 src[x + stride*y]= sample[1][x];

  1376.             }

  1377.         }else{

  1378.             decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

  1379.             if(s->packed_at_lsb){

  1380.                 for(x=0; x<w; x++){

  1381.                     ((uint16_t*)(src + stride*y))[x]= sample[1][x];

  1382.                 }

  1383.             }else{

  1384.                 for(x=0; x<w; x++){

  1385.                     ((uint16_t*)(src + stride*y))[x]= sample[1][x] << (16 - s->avctx->bits_per_raw_sample);

  1386.                 }

  1387.             }

  1388.         }

  1389. //STOP_TIMER("decode-line")}

  1390.     }

  1391. }

  1392. 

  1393. static void decode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){

  1394.     int x, y, p;

  1395.     int16_t *sample[4][2];

  1396.     for(x=0; x<4; x++){

  1397.         sample[x][0] = s->sample_buffer +  x*2   *(w+6) + 3;

  1398.         sample[x][1] = s->sample_buffer + (x*2+1)*(w+6) + 3;

  1399.     }

  1400. 

  1401.     s->run_index=0;

  1402. 

  1403.     memset(s->sample_buffer, 0, 8*(w+6)*sizeof(*s->sample_buffer));

  1404. 

  1405.     for(y=0; y<h; y++){

  1406.         for(p=0; p<3 + s->transparency; p++){

  1407.             int16_t *temp = sample[p][0]; //FIXME try a normal buffer

  1408. 

  1409.             sample[p][0]= sample[p][1];

  1410.             sample[p][1]= temp;

  1411. 

  1412.             sample[p][1][-1]= sample[p][0][0  ];

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

  1414.             decode_line(s, w, sample[p], (p+1)/2, 9);

  1415.         }

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

  1417.             int g= sample[0][1][x];

  1418.             int b= sample[1][1][x];

  1419.             int r= sample[2][1][x];

  1420.             int a= sample[3][1][x];

  1421. 

  1422. //            assert(g>=0 && b>=0 && r>=0);

  1423. //            assert(g<256 && b<512 && r<512);

  1424. 

  1425.             b -= 0x100;

  1426.             r -= 0x100;

  1427.             g -= (b + r)>>2;

  1428.             b += g;

  1429.             r += g;

  1430. 

  1431.             src[x + stride*y]= b + (g<<8) + (r<<16) + (a<<24);

  1432.         }

  1433.     }

  1434. }

  1435. 

  1436. static int decode_slice(AVCodecContext *c, void *arg){

  1437.     FFV1Context *fs= *(void**)arg;

  1438.     FFV1Context *f= fs->avctx->priv_data;

  1439.     int width = fs->slice_width;

  1440.     int height= fs->slice_height;

  1441.     int x= fs->slice_x;

  1442.     int y= fs->slice_y;

  1443.     const int ps= (c->bits_per_raw_sample>8)+1;

  1444.     AVFrame * const p= &f->picture;

  1445. 

  1446.     av_assert1(width && height);

  1447.     if(f->colorspace==0){

  1448.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1449.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1450.         const int cx= x>>f->chroma_h_shift;

  1451.         const int cy= y>>f->chroma_v_shift;

  1452.         decode_plane(fs, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0);

  1453. 

  1454.         if (f->chroma_planes){

  1455.             decode_plane(fs, p->data[1] + ps*cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  1456.             decode_plane(fs, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);

  1457.         }

  1458.         if (fs->transparency)

  1459.             decode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], 2);

  1460.     }else{

  1461.         decode_rgb_frame(fs, (uint32_t*)p->data[0] + ps*x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1462.     }

  1463. 

  1464.     emms_c();

  1465. 

  1466.     return 0;

  1467. }

  1468. 

  1469. static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale){

  1470.     int v;

  1471.     int i=0;

  1472.     uint8_t state[CONTEXT_SIZE];

  1473. 

  1474.     memset(state, 128, sizeof(state));

  1475. 

  1476.     for(v=0; i<128 ; v++){

  1477.         int len= get_symbol(c, state, 0) + 1;

  1478. 

  1479.         if(len + i > 128) return -1;

  1480. 

  1481.         while(len--){

  1482.             quant_table[i] = scale*v;

  1483.             i++;

  1484. //printf("%2d ",v);

  1485. //if(i%16==0) printf("\n");

  1486.         }

  1487.     }

  1488. 

  1489.     for(i=1; i<128; i++){

  1490.         quant_table[256-i]= -quant_table[i];

  1491.     }

  1492.     quant_table[128]= -quant_table[127];

  1493. 

  1494.     return 2*v - 1;

  1495. }

  1496. 

  1497. static int read_quant_tables(RangeCoder *c, int16_t quant_table[MAX_CONTEXT_INPUTS][256]){

  1498.     int i;

  1499.     int context_count=1;

  1500. 

  1501.     for(i=0; i<5; i++){

  1502.         context_count*= read_quant_table(c, quant_table[i], context_count);

  1503.         if(context_count > 32768U){

  1504.             return -1;

  1505.         }

  1506.     }

  1507.     return (context_count+1)/2;

  1508. }

  1509. 

  1510. static int read_extra_header(FFV1Context *f){

  1511.     RangeCoder * const c= &f->c;

  1512.     uint8_t state[CONTEXT_SIZE];

  1513.     int i, j, k;

  1514.     uint8_t state2[32][CONTEXT_SIZE];

  1515. 

  1516.     memset(state2, 128, sizeof(state2));

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

  1518. 

  1519.     ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);

  1520.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1521. 

  1522.     f->version= get_symbol(c, state, 0);

  1523.     f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1524.     if(f->ac>1){

  1525.         for(i=1; i<256; i++){

  1526.             f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1527.         }

  1528.     }

  1529.     f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1530.     f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1531.     get_rac(c, state); //no chroma = false

  1532.     f->chroma_h_shift= get_symbol(c, state, 0);

  1533.     f->chroma_v_shift= get_symbol(c, state, 0);

  1534.     f->transparency= get_rac(c, state);

  1535.     f->plane_count= 2 + f->transparency;

  1536.     f->num_h_slices= 1 + get_symbol(c, state, 0);

  1537.     f->num_v_slices= 1 + get_symbol(c, state, 0);

  1538.     if(f->num_h_slices > (unsigned)f->width || f->num_v_slices > (unsigned)f->height){

  1539.         av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");

  1540.         return -1;

  1541.     }

  1542. 

  1543.     f->quant_table_count= get_symbol(c, state, 0);

  1544.     if(f->quant_table_count > (unsigned)MAX_QUANT_TABLES)

  1545.         return -1;

  1546.     for(i=0; i<f->quant_table_count; i++){

  1547.         if((f->context_count[i]= read_quant_tables(c, f->quant_tables[i])) < 0){

  1548.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1549.             return -1;

  1550.         }

  1551.     }

  1552. 

  1553.     if(allocate_initial_states(f) < 0)

  1554.         return AVERROR(ENOMEM);

  1555. 

  1556.     for(i=0; i<f->quant_table_count; i++){

  1557.         if(get_rac(c, state)){

  1558.             for(j=0; j<f->context_count[i]; j++){

  1559.                 for(k=0; k<CONTEXT_SIZE; k++){

  1560.                     int pred= j ? f->initial_states[i][j-1][k] : 128;

  1561.                     f->initial_states[i][j][k]= (pred+get_symbol(c, state2[k], 1))&0xFF;

  1562.                 }

  1563.             }

  1564.         }

  1565.     }

  1566. 

  1567.     return 0;

  1568. }

  1569. 

  1570. static int read_header(FFV1Context *f){

  1571.     uint8_t state[CONTEXT_SIZE];

  1572.     int i, j, context_count;

  1573.     RangeCoder * const c= &f->slice_context[0]->c;

  1574. 

  1575.     memset(state, 128, sizeof(state));

  1576. 

  1577.     if(f->version < 2){

  1578.         f->version= get_symbol(c, state, 0);

  1579.         f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1580.         if(f->ac>1){

  1581.             for(i=1; i<256; i++){

  1582.                 f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1583.             }

  1584.         }

  1585.         f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1586.         if(f->version>0)

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

  1588.         f->chroma_planes= get_rac(c, state);

  1589.         f->chroma_h_shift= get_symbol(c, state, 0);

  1590.         f->chroma_v_shift= get_symbol(c, state, 0);

  1591.         f->transparency= get_rac(c, state);

  1592.         f->plane_count= 2 + f->transparency;

  1593.     }

  1594. 

  1595.     if(f->colorspace==0){

  1596.         if(f->avctx->bits_per_raw_sample>8 && !f->transparency && !f->chroma_planes){

  1597.             f->avctx->pix_fmt= PIX_FMT_GRAY16;

  1598.         }else if(f->avctx->bits_per_raw_sample<=8 && !f->transparency){

  1599.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1600.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;

  1601.             case 0x01: f->avctx->pix_fmt= PIX_FMT_YUV440P; break;

  1602.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;

  1603.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;

  1604.             case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;

  1605.             case 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  1606.             default:

  1607.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1608.                 return -1;

  1609.             }

  1610.         }else if(f->avctx->bits_per_raw_sample<=8 && f->transparency){

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

  1612.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUVA444P; break;

  1613.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUVA420P; break;

  1614.             default:

  1615.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1616.                 return -1;

  1617.             }

  1618.         }else if(f->avctx->bits_per_raw_sample==9) {

  1619.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1620.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1621.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  1622.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P9 ; f->packed_at_lsb=1; break;

  1623.             default:

  1624.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1625.                 return -1;

  1626.             }

  1627.         }else if(f->avctx->bits_per_raw_sample==10) {

  1628.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1629.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1630.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P10; f->packed_at_lsb=1; break;

  1631.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P10; f->packed_at_lsb=1; break;

  1632.             default:

  1633.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1634.                 return -1;

  1635.             }

  1636.         }else {

  1637.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1638.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1639.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  1640.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P16; break;

  1641.             default:

  1642.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1643.                 return -1;

  1644.             }

  1645.         }

  1646.     }else if(f->colorspace==1){

  1647.         if(f->chroma_h_shift || f->chroma_v_shift){

  1648.             av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");

  1649.             return -1;

  1650.         }

  1651.         if(f->transparency) f->avctx->pix_fmt= PIX_FMT_RGB32;

  1652.         else                f->avctx->pix_fmt= PIX_FMT_0RGB32;

  1653.     }else{

  1654.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  1655.         return -1;

  1656.     }

  1657. 

  1658. //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

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

  1660.         context_count= read_quant_tables(c, f->quant_table);

  1661.         if(context_count < 0){

  1662.                 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1663.                 return -1;

  1664.         }

  1665.     }else{

  1666.         f->slice_count= get_symbol(c, state, 0);

  1667.         if(f->slice_count > (unsigned)MAX_SLICES)

  1668.             return -1;

  1669.     }

  1670. 

  1671.     for(j=0; j<f->slice_count; j++){

  1672.         FFV1Context *fs= f->slice_context[j];

  1673.         fs->ac= f->ac;

  1674.         fs->packed_at_lsb= f->packed_at_lsb;

  1675. 

  1676.         if(f->version >= 2){

  1677.             fs->slice_x     = get_symbol(c, state, 0)   *f->width ;

  1678.             fs->slice_y     = get_symbol(c, state, 0)   *f->height;

  1679.             fs->slice_width =(get_symbol(c, state, 0)+1)*f->width  + fs->slice_x;

  1680.             fs->slice_height=(get_symbol(c, state, 0)+1)*f->height + fs->slice_y;

  1681. 

  1682.             fs->slice_x /= f->num_h_slices;

  1683.             fs->slice_y /= f->num_v_slices;

  1684.             fs->slice_width  = fs->slice_width /f->num_h_slices - fs->slice_x;

  1685.             fs->slice_height = fs->slice_height/f->num_v_slices - fs->slice_y;

  1686.             if((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height)

  1687.                 return -1;

  1688.             if(    (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width

  1689.                 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

  1690.                 return -1;

  1691.         }

  1692. 

  1693.         for(i=0; i<f->plane_count; i++){

  1694.             PlaneContext * const p= &fs->plane[i];

  1695. 

  1696.             if(f->version >= 2){

  1697.                 int idx=get_symbol(c, state, 0);

  1698.                 if(idx > (unsigned)f->quant_table_count){

  1699.                     av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");

  1700.                     return -1;

  1701.                 }

  1702.                 p->quant_table_index= idx;

  1703.                 memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));

  1704.                 context_count= f->context_count[idx];

  1705.             }else{

  1706.                 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));

  1707.             }

  1708. 

  1709.             if(p->context_count < context_count){

  1710.                 av_freep(&p->state);

  1711.                 av_freep(&p->vlc_state);

  1712.             }

  1713.             p->context_count= context_count;

  1714.         }

  1715.     }

  1716. 

  1717.     return 0;

  1718. }

  1719. 

  1720. static av_cold int decode_init(AVCodecContext *avctx)

  1721. {

  1722.     FFV1Context *f = avctx->priv_data;

  1723. 

  1724.     common_init(avctx);

  1725. 

  1726.     if(avctx->extradata && read_extra_header(f) < 0)

  1727.         return -1;

  1728. 

  1729.     if(init_slice_contexts(f) < 0)

  1730.         return -1;

  1731. 

  1732.     return 0;

  1733. }

  1734. 

  1735. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  1736.     const uint8_t *buf = avpkt->data;

  1737.     int buf_size = avpkt->size;

  1738.     FFV1Context *f = avctx->priv_data;

  1739.     RangeCoder * const c= &f->slice_context[0]->c;

  1740.     AVFrame * const p= &f->picture;

  1741.     int bytes_read, i;

  1742.     uint8_t keystate= 128;

  1743.     const uint8_t *buf_p;

  1744. 

  1745.     AVFrame *picture = data;

  1746. 

  1747.     /* release previously stored data */

  1748.     if (p->data[0])

  1749.         avctx->release_buffer(avctx, p);

  1750. 

  1751.     ff_init_range_decoder(c, buf, buf_size);

  1752.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1753. 

  1754. 

  1755.     p->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P

  1756.     if(get_rac(c, &keystate)){

  1757.         p->key_frame= 1;

  1758.         if(read_header(f) < 0)

  1759.             return -1;

  1760.         if(init_slice_state(f) < 0)

  1761.             return -1;

  1762. 

  1763.         clear_state(f);

  1764.     }else{

  1765.         p->key_frame= 0;

  1766.     }

  1767.     if(f->ac>1){

  1768.         int i;

  1769.         for(i=1; i<256; i++){

  1770.             c->one_state[i]= f->state_transition[i];

  1771.             c->zero_state[256-i]= 256-c->one_state[i];

  1772.         }

  1773.     }

  1774. 

  1775.     p->reference= 0;

  1776.     if(avctx->get_buffer(avctx, p) < 0){

  1777.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1778.         return -1;

  1779.     }

  1780. 

  1781.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  1782.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  1783. 

  1784.     if(!f->ac){

  1785.         bytes_read = c->bytestream - c->bytestream_start - 1;

  1786.         if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME

  1787. //printf("pos=%d\n", bytes_read);

  1788.         init_get_bits(&f->slice_context[0]->gb, buf + bytes_read, (buf_size - bytes_read) * 8);

  1789.     } else {

  1790.         bytes_read = 0; /* avoid warning */

  1791.     }

  1792. 

  1793.     buf_p= buf + buf_size;

  1794.     for(i=f->slice_count-1; i>0; i--){

  1795.         FFV1Context *fs= f->slice_context[i];

  1796.         int v= AV_RB24(buf_p-3)+3;

  1797.         if(buf_p - buf <= v){

  1798.             av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");

  1799.             return -1;

  1800.         }

  1801.         buf_p -= v;

  1802.         if(fs->ac){

  1803.             ff_init_range_decoder(&fs->c, buf_p, v);

  1804.         }else{

  1805.             init_get_bits(&fs->gb, buf_p, v * 8);

  1806.         }

  1807.     }

  1808. 

  1809.     avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1810.     f->picture_number++;

  1811. 

  1812.     *picture= *p;

  1813.     *data_size = sizeof(AVFrame);

  1814. 

  1815.     return buf_size;

  1816. }

  1817. 

  1818. AVCodec ff_ffv1_decoder = {

  1819.     .name           = "ffv1",

  1820.     .type           = AVMEDIA_TYPE_VIDEO,

  1821.     .id             = CODEC_ID_FFV1,

  1822.     .priv_data_size = sizeof(FFV1Context),

  1823.     .init           = decode_init,

  1824.     .close          = common_end,

  1825.     .decode         = decode_frame,

  1826.     .capabilities   = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ | CODEC_CAP_SLICE_THREADS,

  1827.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1828. };

  1829. 

  1830. #if CONFIG_FFV1_ENCODER

  1831. AVCodec ff_ffv1_encoder = {

  1832.     .name           = "ffv1",

  1833.     .type           = AVMEDIA_TYPE_VIDEO,

  1834.     .id             = CODEC_ID_FFV1,

  1835.     .priv_data_size = sizeof(FFV1Context),

  1836.     .init           = encode_init,

  1837.     .encode         = encode_frame,

  1838.     .close          = common_end,

  1839.     .capabilities = CODEC_CAP_SLICE_THREADS,

  1840.     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUVA420P, PIX_FMT_YUV444P, PIX_FMT_YUVA444P, PIX_FMT_YUV440P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_0RGB32, PIX_FMT_RGB32, PIX_FMT_YUV420P16, PIX_FMT_YUV422P16, PIX_FMT_YUV444P16, PIX_FMT_YUV420P9, PIX_FMT_YUV420P10, PIX_FMT_YUV422P10, PIX_FMT_GRAY16, PIX_FMT_NONE},

  1841.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1842. };

  1843. #endif