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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 "internal.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. #include "libavutil/pixdesc.h"

  37. #include "libavutil/avassert.h"

  38. 

  39. #ifdef __INTEL_COMPILER

  40. #undef av_flatten

  41. #define av_flatten

  42. #endif

  43. 

  44. #define MAX_PLANES 4

  45. #define CONTEXT_SIZE 32

  46. 

  47. #define MAX_QUANT_TABLES 8

  48. #define MAX_CONTEXT_INPUTS 5

  49. 

  50. extern const uint8_t ff_log2_run[41];

  51. 

  52. static const int8_t quant5_10bit[256]={

  53.  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,

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

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

  56.  1, 1, 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, 2,

  59.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  60.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  61. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  62. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  63. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  64. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  65. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,

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

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

  68. -1,-1,-1,-1,-1,-1,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,

  69. };

  70. 

  71. static const int8_t quant5[256]={

  72.  0, 1, 1, 1, 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,-2,-2,-2,

  81. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  82. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  83. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  84. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

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

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

  87. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,-1,

  88. };

  89. 

  90. static const int8_t quant9_10bit[256]={

  91.  0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2,

  92.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3,

  93.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  94.  3, 3, 3, 3, 3, 3, 3, 3, 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, 4, 4, 4, 4, 4, 4, 4,

  97.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  98.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  99. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  100. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  101. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  102. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  103. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,

  104. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  105. -3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  106. -2,-2,-2,-2,-1,-1,-1,-1,-1,-1,-1,-1,-0,-0,-0,-0,

  107. };

  108. 

  109. static const int8_t quant11[256]={

  110.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

  111.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  112.  4, 4, 4, 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, 5, 5,

  117.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  118. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  119. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  120. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  121. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  122. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  123. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-4,-4,

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

  125. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  126. };

  127. 

  128. static const uint8_t ver2_state[256]= {

  129.    0,  10,  10,  10,  10,  16,  16,  16,  28,  16,  16,  29,  42,  49,  20,  49,

  130.   59,  25,  26,  26,  27,  31,  33,  33,  33,  34,  34,  37,  67,  38,  39,  39,

  131.   40,  40,  41,  79,  43,  44,  45,  45,  48,  48,  64,  50,  51,  52,  88,  52,

  132.   53,  74,  55,  57,  58,  58,  74,  60, 101,  61,  62,  84,  66,  66,  68,  69,

  133.   87,  82,  71,  97,  73,  73,  82,  75, 111,  77,  94,  78,  87,  81,  83,  97,

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

  135.  105, 110, 102, 108, 102, 118, 103, 106, 106, 113, 109, 112, 114, 112, 116, 125,

  136.  115, 116, 117, 117, 126, 119, 125, 121, 121, 123, 145, 124, 126, 131, 127, 129,

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

  138.  147, 155, 151, 149, 151, 150, 152, 157, 153, 154, 156, 168, 158, 162, 161, 160,

  139.  172, 163, 169, 164, 166, 184, 167, 170, 177, 174, 171, 173, 182, 176, 180, 178,

  140.  175, 189, 179, 181, 186, 183, 192, 185, 200, 187, 191, 188, 190, 197, 193, 196,

  141.  197, 194, 195, 196, 198, 202, 199, 201, 210, 203, 207, 204, 205, 206, 208, 214,

  142.  209, 211, 221, 212, 213, 215, 224, 216, 217, 218, 219, 220, 222, 228, 223, 225,

  143.  226, 224, 227, 229, 240, 230, 231, 232, 233, 234, 235, 236, 238, 239, 237, 242,

  144.  241, 243, 242, 244, 245, 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 255,

  145. };

  146. 

  147. typedef struct VlcState{

  148.     int16_t drift;

  149.     uint16_t error_sum;

  150.     int8_t bias;

  151.     uint8_t count;

  152. } VlcState;

  153. 

  154. typedef struct PlaneContext{

  155.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

  156.     int quant_table_index;

  157.     int context_count;

  158.     uint8_t (*state)[CONTEXT_SIZE];

  159.     VlcState *vlc_state;

  160.     uint8_t interlace_bit_state[2];

  161. } PlaneContext;

  162. 

  163. #define MAX_SLICES 256

  164. 

  165. typedef struct FFV1Context{

  166.     AVCodecContext *avctx;

  167.     RangeCoder c;

  168.     GetBitContext gb;

  169.     PutBitContext pb;

  170.     uint64_t rc_stat[256][2];

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

  172.     int version;

  173.     int minor_version;

  174.     int width, height;

  175.     int chroma_h_shift, chroma_v_shift;

  176.     int chroma_planes;

  177.     int transparency;

  178.     int flags;

  179.     int picture_number;

  180.     AVFrame picture;

  181.     int plane_count;

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

  183.     PlaneContext plane[MAX_PLANES];

  184.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

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

  186.     int context_count[MAX_QUANT_TABLES];

  187.     uint8_t state_transition[256];

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

  189.     int run_index;

  190.     int colorspace;

  191.     int16_t *sample_buffer;

  192.     int gob_count;

  193.     int packed_at_lsb;

  194. 

  195.     int quant_table_count;

  196. 

  197.     DSPContext dsp;

  198. 

  199.     struct FFV1Context *slice_context[MAX_SLICES];

  200.     int slice_count;

  201.     int num_v_slices;

  202.     int num_h_slices;

  203.     int slice_width;

  204.     int slice_height;

  205.     int slice_x;

  206.     int slice_y;

  207.     int bits_per_raw_sample;

  208. }FFV1Context;

  209. 

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

  211.     if(bits==8)

  212.         diff= (int8_t)diff;

  213.     else{

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

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

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

  217.     }

  218. 

  219.     return diff;

  220. }

  221. 

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

  223. {

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

  225.     const int  T= last[ 0];

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

  227. 

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

  229. }

  230. 

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

  232.                               int16_t *last, int16_t *last2)

  233. {

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

  235.     const int  T= last[ 0];

  236.     const int RT= last[ 1];

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

  238. 

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

  240.         const int TT= last2[0];

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

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

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

  244.     }else

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

  246. }

  247. 

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

  249.     int i,j,k,m;

  250.     double l2tab[256];

  251. 

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

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

  254. 

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

  256.         double best_len[256];

  257.         double p= i/256.0;

  258. 

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

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

  261. 

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

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

  264.             double len=0;

  265.             occ[j]=1.0;

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

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

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

  269.                     if(occ[m]){

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

  271.                                       + (1-p)*l2tab[256-m]);

  272.                     }

  273.                 }

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

  275.                     best_len[k]= len;

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

  277.                 }

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

  279.                     if(occ[m]){

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

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

  282.                     }

  283.                 }

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

  285.             }

  286.         }

  287.     }

  288. }

  289. 

  290. 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]){

  291.     int i;

  292. 

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

  294. do{\

  295.     if(rc_stat){\

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

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

  298.     }\

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

  300. }while(0)

  301. 

  302.     if(v){

  303.         const int a= FFABS(v);

  304.         const int e= av_log2(a);

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

  306.         if(e<=9){

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

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

  309.             }

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

  311. 

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

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

  314.             }

  315. 

  316.             if(is_signed)

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

  318.         }else{

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

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

  321.             }

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

  323. 

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

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

  326.             }

  327. 

  328.             if(is_signed)

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

  330.         }

  331.     }else{

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

  333.     }

  334. #undef put_rac

  335. }

  336. 

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

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

  339. }

  340. 

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

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

  343.         return 0;

  344.     else{

  345.         int i, e, a;

  346.         e= 0;

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

  348.             e++;

  349.         }

  350. 

  351.         a= 1;

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

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

  354.         }

  355. 

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

  357.         return (a^e)-e;

  358.     }

  359. }

  360. 

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

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

  363. }

  364. 

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

  366.     int drift= state->drift;

  367.     int count= state->count;

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

  369.     drift += v;

  370. 

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

  372.         count >>= 1;

  373.         drift >>= 1;

  374.         state->error_sum >>= 1;

  375.     }

  376.     count++;

  377. 

  378.     if(drift <= -count){

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

  380. 

  381.         drift += count;

  382.         if(drift <= -count)

  383.             drift= -count + 1;

  384.     }else if(drift > 0){

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

  386. 

  387.         drift -= count;

  388.         if(drift > 0)

  389.             drift= 0;

  390.     }

  391. 

  392.     state->drift= drift;

  393.     state->count= count;

  394. }

  395. 

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

  397.     int i, k, code;

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

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

  400. 

  401.     i= state->count;

  402.     k=0;

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

  404.         k++;

  405.         i += i;

  406.     }

  407. 

  408.     assert(k<=8);

  409. 

  410. #if 0 // JPEG LS

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

  412.     else                                         code= v;

  413. #else

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

  415. #endif

  416. 

  417. //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);

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

  419. 

  420.     update_vlc_state(state, v);

  421. }

  422. 

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

  424.     int k, i, v, ret;

  425. 

  426.     i= state->count;

  427.     k=0;

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

  429.         k++;

  430.         i += i;

  431.     }

  432. 

  433.     assert(k<=8);

  434. 

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

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

  437. 

  438. #if 0 // JPEG LS

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

  440. #else

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

  442. #endif

  443. 

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

  445. 

  446.     update_vlc_state(state, v);

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

  448.     return ret;

  449. }

  450. 

  451. #if CONFIG_FFV1_ENCODER

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

  453.                                         int16_t *sample[3],

  454.                                         int plane_index, int bits)

  455. {

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

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

  458.     int x;

  459.     int run_index= s->run_index;

  460.     int run_count=0;

  461.     int run_mode=0;

  462. 

  463.     if(s->ac){

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

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

  466.             return -1;

  467.         }

  468.     }else{

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

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

  471.             return -1;

  472.         }

  473.     }

  474. 

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

  476.         int diff, context;

  477. 

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

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

  480. 

  481.         if(context < 0){

  482.             context = -context;

  483.             diff= -diff;

  484.         }

  485. 

  486.         diff= fold(diff, bits);

  487. 

  488.         if(s->ac){

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

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

  491.             }else{

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

  493.             }

  494.         }else{

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

  496. 

  497.             if(run_mode){

  498. 

  499.                 if(diff){

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

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

  502.                         run_index++;

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

  504.                     }

  505. 

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

  507.                     if(run_index) run_index--;

  508.                     run_count=0;

  509.                     run_mode=0;

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

  511.                 }else{

  512.                     run_count++;

  513.                 }

  514.             }

  515. 

  516. //            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));

  517. 

  518.             if(run_mode == 0)

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

  520.         }

  521.     }

  522.     if(run_mode){

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

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

  525.             run_index++;

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

  527.         }

  528. 

  529.         if(run_count)

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

  531.     }

  532.     s->run_index= run_index;

  533. 

  534.     return 0;

  535. }

  536. 

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

  538.     int x,y,i;

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

  540.     int16_t *sample[3];

  541.     s->run_index=0;

  542. 

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

  544. 

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

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

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

  548. 

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

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

  551. //{START_TIMER

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

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

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

  555.             }

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

  557.         }else{

  558.             if(s->packed_at_lsb){

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

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

  561.                 }

  562.             }else{

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

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

  565.                 }

  566.             }

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

  568.         }

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

  570.     }

  571. }

  572. 

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

  574.     int x, y, p, i;

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

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

  577.     s->run_index=0;

  578. 

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

  580. 

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

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

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

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

  585. 

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

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

  588.             int b= v&0xFF;

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

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

  591.             int a=  v>>24;

  592. 

  593.             b -= g;

  594.             r -= g;

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

  596.             b += 0x100;

  597.             r += 0x100;

  598. 

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

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

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

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

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

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

  605.         }

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

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

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

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

  610.         }

  611.     }

  612. }

  613. 

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

  615.     int last=0;

  616.     int i;

  617.     uint8_t state[CONTEXT_SIZE];

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

  619. 

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

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

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

  623.             last= i;

  624.         }

  625.     }

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

  627. }

  628. 

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

  630.     int i;

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

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

  633. }

  634. 

  635. static void write_header(FFV1Context *f){

  636.     uint8_t state[CONTEXT_SIZE];

  637.     int i, j;

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

  639. 

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

  641. 

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

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

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

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

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

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

  648.             }

  649.         }

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

  651.         if(f->version>0)

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

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

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

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

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

  657. 

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

  659.     }else{

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

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

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

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

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

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

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

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

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

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

  670.             }

  671.         }

  672.     }

  673. }

  674. #endif /* CONFIG_FFV1_ENCODER */

  675. 

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

  677.     FFV1Context *s = avctx->priv_data;

  678. 

  679.     s->avctx= avctx;

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

  681. 

  682.     avcodec_get_frame_defaults(&s->picture);

  683. 

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

  685. 

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

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

  688. 

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

  690.     //defaults

  691.     s->num_h_slices=1;

  692.     s->num_v_slices=1;

  693. 

  694. 

  695.     return 0;

  696. }

  697. 

  698. static int init_slice_state(FFV1Context *f){

  699.     int i, j;

  700. 

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

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

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

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

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

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

  707. 

  708.             if(fs->ac){

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

  710.                 if(!p->    state)

  711.                     return AVERROR(ENOMEM);

  712.             }else{

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

  714.                 if(!p->vlc_state)

  715.                     return AVERROR(ENOMEM);

  716.             }

  717.         }

  718. 

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

  720.             //FIXME only redo if state_transition changed

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

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

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

  724.             }

  725.         }

  726.     }

  727. 

  728.     return 0;

  729. }

  730. 

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

  732.     int i;

  733. 

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

  735. 

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

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

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

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

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

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

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

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

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

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

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

  747. 

  748.         fs->slice_width = sxe - sxs;

  749.         fs->slice_height= sye - sys;

  750.         fs->slice_x     = sxs;

  751.         fs->slice_y     = sys;

  752. 

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

  754.         if (!fs->sample_buffer)

  755.             return AVERROR(ENOMEM);

  756.     }

  757.     return 0;

  758. }

  759. 

  760. static int allocate_initial_states(FFV1Context *f){

  761.     int i;

  762. 

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

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

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

  766.             return AVERROR(ENOMEM);

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

  768.     }

  769.     return 0;

  770. }

  771. 

  772. #if CONFIG_FFV1_ENCODER

  773. static int write_extra_header(FFV1Context *f){

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

  775.     uint8_t state[CONTEXT_SIZE];

  776.     int i, j, k;

  777.     uint8_t state2[32][CONTEXT_SIZE];

  778. 

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

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

  781. 

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

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

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

  785. 

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

  787.     if(f->version > 2)

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

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

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

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

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

  793.         }

  794.     }

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

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

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

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

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

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

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

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

  803. 

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

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

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

  807. 

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

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

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

  811.                 break;

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

  813.             put_rac(c, state, 1);

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

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

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

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

  818.                 }

  819.             }

  820.         }else{

  821.             put_rac(c, state, 0);

  822.         }

  823.     }

  824. 

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

  826. 

  827.     return 0;

  828. }

  829. 

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

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

  832. 

  833.     do{

  834.         changed=0;

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

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

  837. #define COST(old, new) \

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

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

  840. 

  841. #define COST2(old, new) \

  842.     COST(old, new)\

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

  844. 

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

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

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

  848.                     int j;

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

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

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

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

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

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

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

  856.                     }

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

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

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

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

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

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

  863.                         }

  864.                     }

  865.                     print=changed=1;

  866.                 }

  867.             }

  868.         }

  869.     }while(changed);

  870.     return print;

  871. }

  872. 

  873. static av_cold int encode_init(AVCodecContext *avctx)

  874. {

  875.     FFV1Context *s = avctx->priv_data;

  876.     int i, j, k, m;

  877. 

  878.     common_init(avctx);

  879. 

  880.     s->version=0;

  881. 

  882.     if((avctx->flags & (CODEC_FLAG_PASS1|CODEC_FLAG_PASS2)) || avctx->slices>1)

  883.         s->version = FFMAX(s->version, 2);

  884. 

  885.     if(s->version >= 2 && avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {

  886.         av_log(avctx, AV_LOG_ERROR, "Version 2 needed for requested features but version 2 is experimental and not enabled\n");

  887.         return -1;

  888.     }

  889. 

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

  891. 

  892.     if(s->ac>1)

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

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

  895. 

  896.     s->plane_count=3;

  897.     switch(avctx->pix_fmt){

  898.     case PIX_FMT_YUV444P9:

  899.     case PIX_FMT_YUV422P9:

  900.     case PIX_FMT_YUV420P9:

  901.         if (!avctx->bits_per_raw_sample)

  902.             s->bits_per_raw_sample = 9;

  903.     case PIX_FMT_YUV444P10:

  904.     case PIX_FMT_YUV420P10:

  905.     case PIX_FMT_YUV422P10:

  906.         s->packed_at_lsb = 1;

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

  908.             s->bits_per_raw_sample = 10;

  909.     case PIX_FMT_GRAY16:

  910.     case PIX_FMT_YUV444P16:

  911.     case PIX_FMT_YUV422P16:

  912.     case PIX_FMT_YUV420P16:

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

  914.             s->bits_per_raw_sample = 16;

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

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

  917.         }

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

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

  920.             return -1;

  921.         }

  922.         if(!s->ac){

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

  924.             return -1;

  925.         }

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

  927.     case PIX_FMT_GRAY8:

  928.     case PIX_FMT_YUV444P:

  929.     case PIX_FMT_YUV440P:

  930.     case PIX_FMT_YUV422P:

  931.     case PIX_FMT_YUV420P:

  932.     case PIX_FMT_YUV411P:

  933.     case PIX_FMT_YUV410P:

  934.         s->chroma_planes= av_pix_fmt_descriptors[avctx->pix_fmt].nb_components < 3 ? 0 : 1;

  935.         s->colorspace= 0;

  936.         break;

  937.     case PIX_FMT_YUVA444P:

  938.     case PIX_FMT_YUVA420P:

  939.         s->chroma_planes= 1;

  940.         s->colorspace= 0;

  941.         s->transparency= 1;

  942.         break;

  943.     case PIX_FMT_RGB32:

  944.         s->colorspace= 1;

  945.         s->transparency= 1;

  946.         break;

  947.     case PIX_FMT_0RGB32:

  948.         s->colorspace= 1;

  949.         break;

  950.     default:

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

  952.         return -1;

  953.     }

  954.     if (s->transparency) {

  955.         av_log(avctx, AV_LOG_WARNING, "Storing alpha plane, this will require a recent FFV1 decoder to playback!\n");

  956.     }

  957.     if (avctx->context_model > 1U) {

  958.         av_log(avctx, AV_LOG_ERROR, "Invalid context model %d, valid values are 0 and 1\n", avctx->context_model);

  959.         return AVERROR(EINVAL);

  960.     }

  961. 

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

  963.         s->quant_table_count=2;

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

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

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

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

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

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

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

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

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

  973.         }else{

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

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

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

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

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

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

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

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

  982.         }

  983.     }

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

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

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

  987. 

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

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

  990. 

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

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

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

  994.     }

  995. 

  996.     if(allocate_initial_states(s) < 0)

  997.         return AVERROR(ENOMEM);

  998. 

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

  1000.     if(!s->transparency)

  1001.         s->plane_count= 2;

  1002.     avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift, &s->chroma_v_shift);

  1003. 

  1004.     s->picture_number=0;

  1005. 

  1006.     if(avctx->flags & (CODEC_FLAG_PASS1|CODEC_FLAG_PASS2)){

  1007.         for(i=0; i<s->quant_table_count; i++){

  1008.             s->rc_stat2[i]= av_mallocz(s->context_count[i]*sizeof(*s->rc_stat2[i]));

  1009.             if(!s->rc_stat2[i])

  1010.                 return AVERROR(ENOMEM);

  1011.         }

  1012.     }

  1013.     if(avctx->stats_in){

  1014.         char *p= avctx->stats_in;

  1015.         uint8_t best_state[256][256];

  1016.         int gob_count=0;

  1017.         char *next;

  1018. 

  1019.         av_assert0(s->version>=2);

  1020. 

  1021.         for(;;){

  1022.             for(j=0; j<256; j++){

  1023.                 for(i=0; i<2; i++){

  1024.                     s->rc_stat[j][i]= strtol(p, &next, 0);

  1025.                     if(next==p){

  1026.                         av_log(avctx, AV_LOG_ERROR, "2Pass file invalid at %d %d [%s]\n", j,i,p);

  1027.                         return -1;

  1028.                     }

  1029.                     p=next;

  1030.                 }

  1031.             }

  1032.             for(i=0; i<s->quant_table_count; i++){

  1033.                 for(j=0; j<s->context_count[i]; j++){

  1034.                     for(k=0; k<32; k++){

  1035.                         for(m=0; m<2; m++){

  1036.                             s->rc_stat2[i][j][k][m]= strtol(p, &next, 0);

  1037.                             if(next==p){

  1038.                                 av_log(avctx, AV_LOG_ERROR, "2Pass file invalid at %d %d %d %d [%s]\n", i,j,k,m,p);

  1039.                                 return -1;

  1040.                             }

  1041.                             p=next;

  1042.                         }

  1043.                     }

  1044.                 }

  1045.             }

  1046.             gob_count= strtol(p, &next, 0);

  1047.             if(next==p || gob_count <0){

  1048.                 av_log(avctx, AV_LOG_ERROR, "2Pass file invalid\n");

  1049.                 return -1;

  1050.             }

  1051.             p=next;

  1052.             while(*p=='\n' || *p==' ') p++;

  1053.             if(p[0]==0) break;

  1054.         }

  1055.         sort_stt(s, s->state_transition);

  1056. 

  1057.         find_best_state(best_state, s->state_transition);

  1058. 

  1059.         for(i=0; i<s->quant_table_count; i++){

  1060.             for(j=0; j<s->context_count[i]; j++){

  1061.                 for(k=0; k<32; k++){

  1062.                     double p= 128;

  1063.                     if(s->rc_stat2[i][j][k][0]+s->rc_stat2[i][j][k][1]){

  1064.                         p=256.0*s->rc_stat2[i][j][k][1] / (s->rc_stat2[i][j][k][0]+s->rc_stat2[i][j][k][1]);

  1065.                     }

  1066.                     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)];

  1067.                 }

  1068.             }

  1069.         }

  1070.     }

  1071. 

  1072.     if(s->version>1){

  1073.         for(s->num_v_slices=2; s->num_v_slices<9; s->num_v_slices++){

  1074.             for(s->num_h_slices=s->num_v_slices; s->num_h_slices<2*s->num_v_slices; s->num_h_slices++){

  1075.                 if(avctx->slices == s->num_h_slices * s->num_v_slices && avctx->slices <= 64)

  1076.                     goto slices_ok;

  1077.             }

  1078.         }

  1079.         av_log(avctx, AV_LOG_ERROR, "Unsupported number %d of slices requested\n", avctx->slices);

  1080.         return -1;

  1081.         slices_ok:

  1082.         write_extra_header(s);

  1083.     }

  1084. 

  1085.     if(init_slice_contexts(s) < 0)

  1086.         return -1;

  1087.     if(init_slice_state(s) < 0)

  1088.         return -1;

  1089. 

  1090. #define STATS_OUT_SIZE 1024*1024*6

  1091.     if(avctx->flags & CODEC_FLAG_PASS1){

  1092.         avctx->stats_out= av_mallocz(STATS_OUT_SIZE);

  1093.         for(i=0; i<s->quant_table_count; i++){

  1094.             for(j=0; j<s->slice_count; j++){

  1095.                 FFV1Context *sf= s->slice_context[j];

  1096.                 av_assert0(!sf->rc_stat2[i]);

  1097.                 sf->rc_stat2[i]= av_mallocz(s->context_count[i]*sizeof(*sf->rc_stat2[i]));

  1098.                 if(!sf->rc_stat2[i])

  1099.                     return AVERROR(ENOMEM);

  1100.             }

  1101.         }

  1102.     }

  1103. 

  1104.     return 0;

  1105. }

  1106. #endif /* CONFIG_FFV1_ENCODER */

  1107. 

  1108. 

  1109. static void clear_state(FFV1Context *f){

  1110.     int i, si, j;

  1111. 

  1112.     for(si=0; si<f->slice_count; si++){

  1113.         FFV1Context *fs= f->slice_context[si];

  1114.         for(i=0; i<f->plane_count; i++){

  1115.             PlaneContext *p= &fs->plane[i];

  1116. 

  1117.             p->interlace_bit_state[0]= 128;

  1118.             p->interlace_bit_state[1]= 128;

  1119. 

  1120.             if(fs->ac){

  1121.                 if(f->initial_states[p->quant_table_index]){

  1122.                     memcpy(p->state, f->initial_states[p->quant_table_index], CONTEXT_SIZE*p->context_count);

  1123.                 }else

  1124.                 memset(p->state, 128, CONTEXT_SIZE*p->context_count);

  1125.             }else{

  1126.                 for(j=0; j<p->context_count; j++){

  1127.                     p->vlc_state[j].drift= 0;

  1128.                     p->vlc_state[j].error_sum= 4; //FFMAX((RANGE + 32)/64, 2);

  1129.                     p->vlc_state[j].bias= 0;

  1130.                     p->vlc_state[j].count= 1;

  1131.                 }

  1132.             }

  1133.         }

  1134.     }

  1135. }

  1136. 

  1137. #if CONFIG_FFV1_ENCODER

  1138. static int encode_slice(AVCodecContext *c, void *arg){

  1139.     FFV1Context *fs= *(void**)arg;

  1140.     FFV1Context *f= fs->avctx->priv_data;

  1141.     int width = fs->slice_width;

  1142.     int height= fs->slice_height;

  1143.     int x= fs->slice_x;

  1144.     int y= fs->slice_y;

  1145.     AVFrame * const p= &f->picture;

  1146.     const int ps= (f->bits_per_raw_sample>8)+1;

  1147. 

  1148.     if(f->colorspace==0){

  1149.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1150.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1151.         const int cx= x>>f->chroma_h_shift;

  1152.         const int cy= y>>f->chroma_v_shift;

  1153. 

  1154.         encode_plane(fs, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0);

  1155. 

  1156.         if (f->chroma_planes){

  1157.             encode_plane(fs, p->data[1] + ps*cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  1158.             encode_plane(fs, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);

  1159.         }

  1160.         if (fs->transparency)

  1161.             encode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], 2);

  1162.     }else{

  1163.         encode_rgb_frame(fs, (uint32_t*)(p->data[0]) + ps*x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1164.     }

  1165.     emms_c();

  1166. 

  1167.     return 0;

  1168. }

  1169. 

  1170. static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,

  1171.                         const AVFrame *pict, int *got_packet)

  1172. {

  1173.     FFV1Context *f = avctx->priv_data;

  1174.     RangeCoder * const c= &f->slice_context[0]->c;

  1175.     AVFrame * const p= &f->picture;

  1176.     int used_count= 0;

  1177.     uint8_t keystate=128;

  1178.     uint8_t *buf_p;

  1179.     int i, ret;

  1180. 

  1181.     if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width*avctx->height*((8*2+1+1)*4)/8

  1182.                                   + FF_MIN_BUFFER_SIZE)) < 0)

  1183.         return ret;

  1184. 

  1185.     ff_init_range_encoder(c, pkt->data, pkt->size);

  1186.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1187. 

  1188.     *p = *pict;

  1189.     p->pict_type= AV_PICTURE_TYPE_I;

  1190. 

  1191.     if(avctx->gop_size==0 || f->picture_number % avctx->gop_size == 0){

  1192.         put_rac(c, &keystate, 1);

  1193.         p->key_frame= 1;

  1194.         f->gob_count++;

  1195.         write_header(f);

  1196.         clear_state(f);

  1197.     }else{

  1198.         put_rac(c, &keystate, 0);

  1199.         p->key_frame= 0;

  1200.     }

  1201. 

  1202.     if(!f->ac){

  1203.         used_count += ff_rac_terminate(c);

  1204. //printf("pos=%d\n", used_count);

  1205.         init_put_bits(&f->slice_context[0]->pb, pkt->data + used_count, pkt->size - used_count);

  1206.     }else if (f->ac>1){

  1207.         int i;

  1208.         for(i=1; i<256; i++){

  1209.             c->one_state[i]= f->state_transition[i];

  1210.             c->zero_state[256-i]= 256-c->one_state[i];

  1211.         }

  1212.     }

  1213. 

  1214.     for(i=1; i<f->slice_count; i++){

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

  1216.         uint8_t *start = pkt->data + (pkt->size-used_count)*i/f->slice_count;

  1217.         int len = pkt->size/f->slice_count;

  1218. 

  1219.         if(fs->ac){

  1220.             ff_init_range_encoder(&fs->c, start, len);

  1221.         }else{

  1222.             init_put_bits(&fs->pb, start, len);

  1223.         }

  1224.     }

  1225.     avctx->execute(avctx, encode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1226. 

  1227.     buf_p = pkt->data;

  1228.     for(i=0; i<f->slice_count; i++){

  1229.         FFV1Context *fs= f->slice_context[i];

  1230.         int bytes;

  1231. 

  1232.         if(fs->ac){

  1233.             uint8_t state=128;

  1234.             put_rac(&fs->c, &state, 0);

  1235.             bytes= ff_rac_terminate(&fs->c);

  1236.         }else{

  1237.             flush_put_bits(&fs->pb); //nicer padding FIXME

  1238.             bytes= used_count + (put_bits_count(&fs->pb)+7)/8;

  1239.             used_count= 0;

  1240.         }

  1241.         if(i>0){

  1242.             av_assert0(bytes < pkt->size/f->slice_count);

  1243.             memmove(buf_p, fs->ac ? fs->c.bytestream_start : fs->pb.buf, bytes);

  1244.             av_assert0(bytes < (1<<24));

  1245.             AV_WB24(buf_p+bytes, bytes);

  1246.             bytes+=3;

  1247.         }

  1248.         buf_p += bytes;

  1249.     }

  1250. 

  1251.     if((avctx->flags&CODEC_FLAG_PASS1) && (f->picture_number&31)==0){

  1252.         int j, k, m;

  1253.         char *p= avctx->stats_out;

  1254.         char *end= p + STATS_OUT_SIZE;

  1255. 

  1256.         memset(f->rc_stat, 0, sizeof(f->rc_stat));

  1257.         for(i=0; i<f->quant_table_count; i++)

  1258.             memset(f->rc_stat2[i], 0, f->context_count[i]*sizeof(*f->rc_stat2[i]));

  1259. 

  1260.         for(j=0; j<f->slice_count; j++){

  1261.             FFV1Context *fs= f->slice_context[j];

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

  1263.                 f->rc_stat[i][0] += fs->rc_stat[i][0];

  1264.                 f->rc_stat[i][1] += fs->rc_stat[i][1];

  1265.             }

  1266.             for(i=0; i<f->quant_table_count; i++){

  1267.                 for(k=0; k<f->context_count[i]; k++){

  1268.                     for(m=0; m<32; m++){

  1269.                         f->rc_stat2[i][k][m][0] += fs->rc_stat2[i][k][m][0];

  1270.                         f->rc_stat2[i][k][m][1] += fs->rc_stat2[i][k][m][1];

  1271.                     }

  1272.                 }

  1273.             }

  1274.         }

  1275. 

  1276.         for(j=0; j<256; j++){

  1277.             snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat[j][0], f->rc_stat[j][1]);

  1278.             p+= strlen(p);

  1279.         }

  1280.         snprintf(p, end-p, "\n");

  1281. 

  1282.         for(i=0; i<f->quant_table_count; i++){

  1283.             for(j=0; j<f->context_count[i]; j++){

  1284.                 for(m=0; m<32; m++){

  1285.                     snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat2[i][j][m][0], f->rc_stat2[i][j][m][1]);

  1286.                     p+= strlen(p);

  1287.                 }

  1288.             }

  1289.         }

  1290.         snprintf(p, end-p, "%d\n", f->gob_count);

  1291.     } else if(avctx->flags&CODEC_FLAG_PASS1)

  1292.         avctx->stats_out[0] = '\0';

  1293. 

  1294.     f->picture_number++;

  1295.     pkt->size   = buf_p - pkt->data;

  1296.     pkt->flags |= AV_PKT_FLAG_KEY*p->key_frame;

  1297.     *got_packet = 1;

  1298. 

  1299.     return 0;

  1300. }

  1301. #endif /* CONFIG_FFV1_ENCODER */

  1302. 

  1303. static av_cold int common_end(AVCodecContext *avctx){

  1304.     FFV1Context *s = avctx->priv_data;

  1305.     int i, j;

  1306. 

  1307.     if (avctx->codec->decode && s->picture.data[0])

  1308.         avctx->release_buffer(avctx, &s->picture);

  1309. 

  1310.     for(j=0; j<s->slice_count; j++){

  1311.         FFV1Context *fs= s->slice_context[j];

  1312.         for(i=0; i<s->plane_count; i++){

  1313.             PlaneContext *p= &fs->plane[i];

  1314. 

  1315.             av_freep(&p->state);

  1316.             av_freep(&p->vlc_state);

  1317.         }

  1318.         av_freep(&fs->sample_buffer);

  1319.     }

  1320. 

  1321.     av_freep(&avctx->stats_out);

  1322.     for(j=0; j<s->quant_table_count; j++){

  1323.         av_freep(&s->initial_states[j]);

  1324.         for(i=0; i<s->slice_count; i++){

  1325.             FFV1Context *sf= s->slice_context[i];

  1326.             av_freep(&sf->rc_stat2[j]);

  1327.         }

  1328.         av_freep(&s->rc_stat2[j]);

  1329.     }

  1330. 

  1331.     for(i=0; i<s->slice_count; i++){

  1332.         av_freep(&s->slice_context[i]);

  1333.     }

  1334. 

  1335.     return 0;

  1336. }

  1337. 

  1338. static av_always_inline void decode_line(FFV1Context *s, int w,

  1339.                                          int16_t *sample[2],

  1340.                                          int plane_index, int bits)

  1341. {

  1342.     PlaneContext * const p= &s->plane[plane_index];

  1343.     RangeCoder * const c= &s->c;

  1344.     int x;

  1345.     int run_count=0;

  1346.     int run_mode=0;

  1347.     int run_index= s->run_index;

  1348. 

  1349.     for(x=0; x<w; x++){

  1350.         int diff, context, sign;

  1351. 

  1352.         context= get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);

  1353.         if(context < 0){

  1354.             context= -context;

  1355.             sign=1;

  1356.         }else

  1357.             sign=0;

  1358. 

  1359.         av_assert2(context < p->context_count);

  1360. 

  1361.         if(s->ac){

  1362.             diff= get_symbol_inline(c, p->state[context], 1);

  1363.         }else{

  1364.             if(context == 0 && run_mode==0) run_mode=1;

  1365. 

  1366.             if(run_mode){

  1367.                 if(run_count==0 && run_mode==1){

  1368.                     if(get_bits1(&s->gb)){

  1369.                         run_count = 1<<ff_log2_run[run_index];

  1370.                         if(x + run_count <= w) run_index++;

  1371.                     }else{

  1372.                         if(ff_log2_run[run_index]) run_count = get_bits(&s->gb, ff_log2_run[run_index]);

  1373.                         else run_count=0;

  1374.                         if(run_index) run_index--;

  1375.                         run_mode=2;

  1376.                     }

  1377.                 }

  1378.                 run_count--;

  1379.                 if(run_count < 0){

  1380.                     run_mode=0;

  1381.                     run_count=0;

  1382.                     diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1383.                     if(diff>=0) diff++;

  1384.                 }else

  1385.                     diff=0;

  1386.             }else

  1387.                 diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1388. 

  1389. //            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));

  1390.         }

  1391. 

  1392.         if(sign) diff= -diff;

  1393. 

  1394.         sample[1][x]= (predict(sample[1] + x, sample[0] + x) + diff) & ((1<<bits)-1);

  1395.     }

  1396.     s->run_index= run_index;

  1397. }

  1398. 

  1399. static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){

  1400.     int x, y;

  1401.     int16_t *sample[2];

  1402.     sample[0]=s->sample_buffer    +3;

  1403.     sample[1]=s->sample_buffer+w+6+3;

  1404. 

  1405.     s->run_index=0;

  1406. 

  1407.     memset(s->sample_buffer, 0, 2*(w+6)*sizeof(*s->sample_buffer));

  1408. 

  1409.     for(y=0; y<h; y++){

  1410.         int16_t *temp = sample[0]; //FIXME try a normal buffer

  1411. 

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

  1413.         sample[1]= temp;

  1414. 

  1415.         sample[1][-1]= sample[0][0  ];

  1416.         sample[0][ w]= sample[0][w-1];

  1417. 

  1418. //{START_TIMER

  1419.         if(s->avctx->bits_per_raw_sample <= 8){

  1420.             decode_line(s, w, sample, plane_index, 8);

  1421.             for(x=0; x<w; x++){

  1422.                 src[x + stride*y]= sample[1][x];

  1423.             }

  1424.         }else{

  1425.             decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

  1426.             if(s->packed_at_lsb){

  1427.                 for(x=0; x<w; x++){

  1428.                     ((uint16_t*)(src + stride*y))[x]= sample[1][x];

  1429.                 }

  1430.             }else{

  1431.                 for(x=0; x<w; x++){

  1432.                     ((uint16_t*)(src + stride*y))[x]= sample[1][x] << (16 - s->avctx->bits_per_raw_sample);

  1433.                 }

  1434.             }

  1435.         }

  1436. //STOP_TIMER("decode-line")}

  1437.     }

  1438. }

  1439. 

  1440. static void decode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){

  1441.     int x, y, p;

  1442.     int16_t *sample[4][2];

  1443.     for(x=0; x<4; x++){

  1444.         sample[x][0] = s->sample_buffer +  x*2   *(w+6) + 3;

  1445.         sample[x][1] = s->sample_buffer + (x*2+1)*(w+6) + 3;

  1446.     }

  1447. 

  1448.     s->run_index=0;

  1449. 

  1450.     memset(s->sample_buffer, 0, 8*(w+6)*sizeof(*s->sample_buffer));

  1451. 

  1452.     for(y=0; y<h; y++){

  1453.         for(p=0; p<3 + s->transparency; p++){

  1454.             int16_t *temp = sample[p][0]; //FIXME try a normal buffer

  1455. 

  1456.             sample[p][0]= sample[p][1];

  1457.             sample[p][1]= temp;

  1458. 

  1459.             sample[p][1][-1]= sample[p][0][0  ];

  1460.             sample[p][0][ w]= sample[p][0][w-1];

  1461.             decode_line(s, w, sample[p], (p+1)/2, 9);

  1462.         }

  1463.         for(x=0; x<w; x++){

  1464.             int g= sample[0][1][x];

  1465.             int b= sample[1][1][x];

  1466.             int r= sample[2][1][x];

  1467.             int a= sample[3][1][x];

  1468. 

  1469. //            assert(g>=0 && b>=0 && r>=0);

  1470. //            assert(g<256 && b<512 && r<512);

  1471. 

  1472.             b -= 0x100;

  1473.             r -= 0x100;

  1474.             g -= (b + r)>>2;

  1475.             b += g;

  1476.             r += g;

  1477. 

  1478.             src[x + stride*y]= b + (g<<8) + (r<<16) + (a<<24);

  1479.         }

  1480.     }

  1481. }

  1482. 

  1483. static int decode_slice(AVCodecContext *c, void *arg){

  1484.     FFV1Context *fs= *(void**)arg;

  1485.     FFV1Context *f= fs->avctx->priv_data;

  1486.     int width = fs->slice_width;

  1487.     int height= fs->slice_height;

  1488.     int x= fs->slice_x;

  1489.     int y= fs->slice_y;

  1490.     const int ps= (c->bits_per_raw_sample>8)+1;

  1491.     AVFrame * const p= &f->picture;

  1492. 

  1493.     av_assert1(width && height);

  1494.     if(f->colorspace==0){

  1495.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1496.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1497.         const int cx= x>>f->chroma_h_shift;

  1498.         const int cy= y>>f->chroma_v_shift;

  1499.         decode_plane(fs, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0);

  1500. 

  1501.         if (f->chroma_planes){

  1502.             decode_plane(fs, p->data[1] + ps*cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  1503.             decode_plane(fs, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);

  1504.         }

  1505.         if (fs->transparency)

  1506.             decode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], 2);

  1507.     }else{

  1508.         decode_rgb_frame(fs, (uint32_t*)p->data[0] + ps*x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1509.     }

  1510. 

  1511.     emms_c();

  1512. 

  1513.     return 0;

  1514. }

  1515. 

  1516. static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale){

  1517.     int v;

  1518.     int i=0;

  1519.     uint8_t state[CONTEXT_SIZE];

  1520. 

  1521.     memset(state, 128, sizeof(state));

  1522. 

  1523.     for(v=0; i<128 ; v++){

  1524.         int len= get_symbol(c, state, 0) + 1;

  1525. 

  1526.         if(len + i > 128) return -1;

  1527. 

  1528.         while(len--){

  1529.             quant_table[i] = scale*v;

  1530.             i++;

  1531. //printf("%2d ",v);

  1532. //if(i%16==0) printf("\n");

  1533.         }

  1534.     }

  1535. 

  1536.     for(i=1; i<128; i++){

  1537.         quant_table[256-i]= -quant_table[i];

  1538.     }

  1539.     quant_table[128]= -quant_table[127];

  1540. 

  1541.     return 2*v - 1;

  1542. }

  1543. 

  1544. static int read_quant_tables(RangeCoder *c, int16_t quant_table[MAX_CONTEXT_INPUTS][256]){

  1545.     int i;

  1546.     int context_count=1;

  1547. 

  1548.     for(i=0; i<5; i++){

  1549.         context_count*= read_quant_table(c, quant_table[i], context_count);

  1550.         if(context_count > 32768U){

  1551.             return -1;

  1552.         }

  1553.     }

  1554.     return (context_count+1)/2;

  1555. }

  1556. 

  1557. static int read_extra_header(FFV1Context *f){

  1558.     RangeCoder * const c= &f->c;

  1559.     uint8_t state[CONTEXT_SIZE];

  1560.     int i, j, k;

  1561.     uint8_t state2[32][CONTEXT_SIZE];

  1562. 

  1563.     memset(state2, 128, sizeof(state2));

  1564.     memset(state, 128, sizeof(state));

  1565. 

  1566.     ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);

  1567.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1568. 

  1569.     f->version= get_symbol(c, state, 0);

  1570.     if(f->version > 2)

  1571.         f->minor_version= get_symbol(c, state, 0);

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

  1573.     if(f->ac>1){

  1574.         for(i=1; i<256; i++){

  1575.             f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1576.         }

  1577.     }

  1578.     f->colorspace= get_symbol(c, state, 0); //YUV cs type

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

  1580.     f->chroma_planes= get_rac(c, state);

  1581.     f->chroma_h_shift= get_symbol(c, state, 0);

  1582.     f->chroma_v_shift= get_symbol(c, state, 0);

  1583.     f->transparency= get_rac(c, state);

  1584.     f->plane_count= 2 + f->transparency;

  1585.     f->num_h_slices= 1 + get_symbol(c, state, 0);

  1586.     f->num_v_slices= 1 + get_symbol(c, state, 0);

  1587.     if(f->num_h_slices > (unsigned)f->width || f->num_v_slices > (unsigned)f->height){

  1588.         av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");

  1589.         return -1;

  1590.     }

  1591. 

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

  1593.     if(f->quant_table_count > (unsigned)MAX_QUANT_TABLES)

  1594.         return -1;

  1595.     for(i=0; i<f->quant_table_count; i++){

  1596.         if((f->context_count[i]= read_quant_tables(c, f->quant_tables[i])) < 0){

  1597.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1598.             return -1;

  1599.         }

  1600.     }

  1601. 

  1602.     if(allocate_initial_states(f) < 0)

  1603.         return AVERROR(ENOMEM);

  1604. 

  1605.     for(i=0; i<f->quant_table_count; i++){

  1606.         if(get_rac(c, state)){

  1607.             for(j=0; j<f->context_count[i]; j++){

  1608.                 for(k=0; k<CONTEXT_SIZE; k++){

  1609.                     int pred= j ? f->initial_states[i][j-1][k] : 128;

  1610.                     f->initial_states[i][j][k]= (pred+get_symbol(c, state2[k], 1))&0xFF;

  1611.                 }

  1612.             }

  1613.         }

  1614.     }

  1615. 

  1616.     return 0;

  1617. }

  1618. 

  1619. static int read_header(FFV1Context *f){

  1620.     uint8_t state[CONTEXT_SIZE];

  1621.     int i, j, context_count;

  1622.     RangeCoder * const c= &f->slice_context[0]->c;

  1623. 

  1624.     memset(state, 128, sizeof(state));

  1625. 

  1626.     if(f->version < 2){

  1627.         f->version= get_symbol(c, state, 0);

  1628.         f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1629.         if(f->ac>1){

  1630.             for(i=1; i<256; i++){

  1631.                 f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1632.             }

  1633.         }

  1634.         f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1635.         if(f->version>0)

  1636.             f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1637.         f->chroma_planes= get_rac(c, state);

  1638.         f->chroma_h_shift= get_symbol(c, state, 0);

  1639.         f->chroma_v_shift= get_symbol(c, state, 0);

  1640.         f->transparency= get_rac(c, state);

  1641.         f->plane_count= 2 + f->transparency;

  1642.     }

  1643. 

  1644.     if(f->colorspace==0){

  1645.         if(!f->transparency && !f->chroma_planes){

  1646.             if (f->avctx->bits_per_raw_sample<=8)

  1647.                 f->avctx->pix_fmt= PIX_FMT_GRAY8;

  1648.             else

  1649.                 f->avctx->pix_fmt= PIX_FMT_GRAY16;

  1650.         }else if(f->avctx->bits_per_raw_sample<=8 && !f->transparency){

  1651.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1652.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;

  1653.             case 0x01: f->avctx->pix_fmt= PIX_FMT_YUV440P; break;

  1654.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;

  1655.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;

  1656.             case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;

  1657.             case 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  1658.             default:

  1659.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1660.                 return -1;

  1661.             }

  1662.         }else if(f->avctx->bits_per_raw_sample<=8 && f->transparency){

  1663.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1664.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUVA444P; break;

  1665.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUVA420P; break;

  1666.             default:

  1667.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1668.                 return -1;

  1669.             }

  1670.         }else if(f->avctx->bits_per_raw_sample==9) {

  1671.             f->packed_at_lsb=1;

  1672.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1673.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P9; break;

  1674.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P9; break;

  1675.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P9; break;

  1676.             default:

  1677.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1678.                 return -1;

  1679.             }

  1680.         }else if(f->avctx->bits_per_raw_sample==10) {

  1681.             f->packed_at_lsb=1;

  1682.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1683.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P10; break;

  1684.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P10; break;

  1685.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P10; break;

  1686.             default:

  1687.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1688.                 return -1;

  1689.             }

  1690.         }else {

  1691.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1692.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1693.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  1694.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P16; break;

  1695.             default:

  1696.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1697.                 return -1;

  1698.             }

  1699.         }

  1700.     }else if(f->colorspace==1){

  1701.         if(f->chroma_h_shift || f->chroma_v_shift){

  1702.             av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");

  1703.             return -1;

  1704.         }

  1705.         if(f->transparency) f->avctx->pix_fmt= PIX_FMT_RGB32;

  1706.         else                f->avctx->pix_fmt= PIX_FMT_0RGB32;

  1707.     }else{

  1708.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  1709.         return -1;

  1710.     }

  1711. 

  1712. //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

  1713.     if(f->version < 2){

  1714.         context_count= read_quant_tables(c, f->quant_table);

  1715.         if(context_count < 0){

  1716.                 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1717.                 return -1;

  1718.         }

  1719.     }else{

  1720.         f->slice_count= get_symbol(c, state, 0);

  1721.         if(f->slice_count > (unsigned)MAX_SLICES)

  1722.             return -1;

  1723.     }

  1724. 

  1725.     for(j=0; j<f->slice_count; j++){

  1726.         FFV1Context *fs= f->slice_context[j];

  1727.         fs->ac= f->ac;

  1728.         fs->packed_at_lsb= f->packed_at_lsb;

  1729. 

  1730.         if(f->version >= 2){

  1731.             fs->slice_x     = get_symbol(c, state, 0)   *f->width ;

  1732.             fs->slice_y     = get_symbol(c, state, 0)   *f->height;

  1733.             fs->slice_width =(get_symbol(c, state, 0)+1)*f->width  + fs->slice_x;

  1734.             fs->slice_height=(get_symbol(c, state, 0)+1)*f->height + fs->slice_y;

  1735. 

  1736.             fs->slice_x /= f->num_h_slices;

  1737.             fs->slice_y /= f->num_v_slices;

  1738.             fs->slice_width  = fs->slice_width /f->num_h_slices - fs->slice_x;

  1739.             fs->slice_height = fs->slice_height/f->num_v_slices - fs->slice_y;

  1740.             if((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height)

  1741.                 return -1;

  1742.             if(    (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width

  1743.                 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

  1744.                 return -1;

  1745.         }

  1746. 

  1747.         for(i=0; i<f->plane_count; i++){

  1748.             PlaneContext * const p= &fs->plane[i];

  1749. 

  1750.             if(f->version >= 2){

  1751.                 int idx=get_symbol(c, state, 0);

  1752.                 if(idx > (unsigned)f->quant_table_count){

  1753.                     av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");

  1754.                     return -1;

  1755.                 }

  1756.                 p->quant_table_index= idx;

  1757.                 memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));

  1758.                 context_count= f->context_count[idx];

  1759.             }else{

  1760.                 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));

  1761.             }

  1762. 

  1763.             if(p->context_count < context_count){

  1764.                 av_freep(&p->state);

  1765.                 av_freep(&p->vlc_state);

  1766.             }

  1767.             p->context_count= context_count;

  1768.         }

  1769.     }

  1770. 

  1771.     return 0;

  1772. }

  1773. 

  1774. static av_cold int decode_init(AVCodecContext *avctx)

  1775. {

  1776.     FFV1Context *f = avctx->priv_data;

  1777. 

  1778.     common_init(avctx);

  1779. 

  1780.     if(avctx->extradata && read_extra_header(f) < 0)

  1781.         return -1;

  1782. 

  1783.     if(init_slice_contexts(f) < 0)

  1784.         return -1;

  1785. 

  1786.     return 0;

  1787. }

  1788. 

  1789. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  1790.     const uint8_t *buf = avpkt->data;

  1791.     int buf_size = avpkt->size;

  1792.     FFV1Context *f = avctx->priv_data;

  1793.     RangeCoder * const c= &f->slice_context[0]->c;

  1794.     AVFrame * const p= &f->picture;

  1795.     int bytes_read, i;

  1796.     uint8_t keystate= 128;

  1797.     const uint8_t *buf_p;

  1798. 

  1799.     AVFrame *picture = data;

  1800. 

  1801.     /* release previously stored data */

  1802.     if (p->data[0])

  1803.         avctx->release_buffer(avctx, p);

  1804. 

  1805.     ff_init_range_decoder(c, buf, buf_size);

  1806.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1807. 

  1808. 

  1809.     p->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P

  1810.     if(get_rac(c, &keystate)){

  1811.         p->key_frame= 1;

  1812.         if(read_header(f) < 0)

  1813.             return -1;

  1814.         if(init_slice_state(f) < 0)

  1815.             return -1;

  1816. 

  1817.         clear_state(f);

  1818.     }else{

  1819.         p->key_frame= 0;

  1820.     }

  1821.     if(f->ac>1){

  1822.         int i;

  1823.         for(i=1; i<256; i++){

  1824.             c->one_state[i]= f->state_transition[i];

  1825.             c->zero_state[256-i]= 256-c->one_state[i];

  1826.         }

  1827.     }

  1828. 

  1829.     p->reference= 0;

  1830.     if(avctx->get_buffer(avctx, p) < 0){

  1831.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1832.         return -1;

  1833.     }

  1834. 

  1835.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  1836.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  1837. 

  1838.     if(!f->ac){

  1839.         bytes_read = c->bytestream - c->bytestream_start - 1;

  1840.         if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME

  1841. //printf("pos=%d\n", bytes_read);

  1842.         init_get_bits(&f->slice_context[0]->gb, buf + bytes_read, (buf_size - bytes_read) * 8);

  1843.     } else {

  1844.         bytes_read = 0; /* avoid warning */

  1845.     }

  1846. 

  1847.     buf_p= buf + buf_size;

  1848.     for(i=f->slice_count-1; i>0; i--){

  1849.         FFV1Context *fs= f->slice_context[i];

  1850.         int v= AV_RB24(buf_p-3)+3;

  1851.         if(buf_p - buf <= v){

  1852.             av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");

  1853.             return -1;

  1854.         }

  1855.         buf_p -= v;

  1856.         if(fs->ac){

  1857.             ff_init_range_decoder(&fs->c, buf_p, v);

  1858.         }else{

  1859.             init_get_bits(&fs->gb, buf_p, v * 8);

  1860.         }

  1861.     }

  1862. 

  1863.     avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1864.     f->picture_number++;

  1865. 

  1866.     *picture= *p;

  1867.     *data_size = sizeof(AVFrame);

  1868. 

  1869.     return buf_size;

  1870. }

  1871. 

  1872. AVCodec ff_ffv1_decoder = {

  1873.     .name           = "ffv1",

  1874.     .type           = AVMEDIA_TYPE_VIDEO,

  1875.     .id             = CODEC_ID_FFV1,

  1876.     .priv_data_size = sizeof(FFV1Context),

  1877.     .init           = decode_init,

  1878.     .close          = common_end,

  1879.     .decode         = decode_frame,

  1880.     .capabilities   = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ |

  1881.                       CODEC_CAP_SLICE_THREADS,

  1882.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1883. };

  1884. 

  1885. #if CONFIG_FFV1_ENCODER

  1886. AVCodec ff_ffv1_encoder = {

  1887.     .name           = "ffv1",

  1888.     .type           = AVMEDIA_TYPE_VIDEO,

  1889.     .id             = CODEC_ID_FFV1,

  1890.     .priv_data_size = sizeof(FFV1Context),

  1891.     .init           = encode_init,

  1892.     .encode2        = encode_frame,

  1893.     .close          = common_end,

  1894.     .capabilities   = CODEC_CAP_SLICE_THREADS,

  1895.     .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_YUV444P9, PIX_FMT_YUV422P9, PIX_FMT_YUV420P9, PIX_FMT_YUV420P10, PIX_FMT_YUV422P10, PIX_FMT_YUV444P10, PIX_FMT_GRAY16, PIX_FMT_GRAY8, PIX_FMT_NONE},

  1896.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1897. };

  1898. #endif