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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. #define MAX_PLANES 4

  40. #define CONTEXT_SIZE 32

  41. 

  42. #define MAX_QUANT_TABLES 8

  43. #define MAX_CONTEXT_INPUTS 5

  44. 

  45. extern const uint8_t ff_log2_run[41];

  46. 

  47. static const int8_t quant5_10bit[256]={

  48.  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,

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

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

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

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

  62. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

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

  64. };

  65. 

  66. static const int8_t quant5[256]={

  67.  0, 1, 1, 1, 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,-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,-1,-1,-1,

  83. };

  84. 

  85. static const int8_t quant9_10bit[256]={

  86.  0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2,

  87.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3,

  88.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  89.  3, 3, 3, 3, 3, 3, 3, 3, 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,-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,-3,-3,-3,-3,-3,-3,-3,

  99. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  100. -3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  101. -2,-2,-2,-2,-1,-1,-1,-1,-1,-1,-1,-1,-0,-0,-0,-0,

  102. };

  103. 

  104. static const int8_t quant11[256]={

  105.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

  106.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  107.  4, 4, 4, 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,-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,-4,-4,

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

  120. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  121. };

  122. 

  123. static const uint8_t ver2_state[256]= {

  124.    0,  10,  10,  10,  10,  16,  16,  16,  28,  16,  16,  29,  42,  49,  20,  49,

  125.   59,  25,  26,  26,  27,  31,  33,  33,  33,  34,  34,  37,  67,  38,  39,  39,

  126.   40,  40,  41,  79,  43,  44,  45,  45,  48,  48,  64,  50,  51,  52,  88,  52,

  127.   53,  74,  55,  57,  58,  58,  74,  60, 101,  61,  62,  84,  66,  66,  68,  69,

  128.   87,  82,  71,  97,  73,  73,  82,  75, 111,  77,  94,  78,  87,  81,  83,  97,

  129.   85,  83,  94,  86,  99,  89,  90,  99, 111,  92,  93, 134,  95,  98, 105,  98,

  130.  105, 110, 102, 108, 102, 118, 103, 106, 106, 113, 109, 112, 114, 112, 116, 125,

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

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

  133.  147, 155, 151, 149, 151, 150, 152, 157, 153, 154, 156, 168, 158, 162, 161, 160,

  134.  172, 163, 169, 164, 166, 184, 167, 170, 177, 174, 171, 173, 182, 176, 180, 178,

  135.  175, 189, 179, 181, 186, 183, 192, 185, 200, 187, 191, 188, 190, 197, 193, 196,

  136.  197, 194, 195, 196, 198, 202, 199, 201, 210, 203, 207, 204, 205, 206, 208, 214,

  137.  209, 211, 221, 212, 213, 215, 224, 216, 217, 218, 219, 220, 222, 228, 223, 225,

  138.  226, 224, 227, 229, 240, 230, 231, 232, 233, 234, 235, 236, 238, 239, 237, 242,

  139.  241, 243, 242, 244, 245, 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 255,

  140. };

  141. 

  142. typedef struct VlcState{

  143.     int16_t drift;

  144.     uint16_t error_sum;

  145.     int8_t bias;

  146.     uint8_t count;

  147. } VlcState;

  148. 

  149. typedef struct PlaneContext{

  150.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

  151.     int quant_table_index;

  152.     int context_count;

  153.     uint8_t (*state)[CONTEXT_SIZE];

  154.     VlcState *vlc_state;

  155.     uint8_t interlace_bit_state[2];

  156. } PlaneContext;

  157. 

  158. #define MAX_SLICES 256

  159. 

  160. typedef struct FFV1Context{

  161.     AVCodecContext *avctx;

  162.     RangeCoder c;

  163.     GetBitContext gb;

  164.     PutBitContext pb;

  165.     uint64_t rc_stat[256][2];

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

  167.     int version;

  168.     int minor_version;

  169.     int width, height;

  170.     int chroma_h_shift, chroma_v_shift;

  171.     int chroma_planes;

  172.     int transparency;

  173.     int flags;

  174.     int picture_number;

  175.     AVFrame picture;

  176.     int plane_count;

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

  178.     PlaneContext plane[MAX_PLANES];

  179.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

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

  181.     int context_count[MAX_QUANT_TABLES];

  182.     uint8_t state_transition[256];

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

  184.     int run_index;

  185.     int colorspace;

  186.     int16_t *sample_buffer;

  187.     int gob_count;

  188.     int packed_at_lsb;

  189. 

  190.     int quant_table_count;

  191. 

  192.     DSPContext dsp;

  193. 

  194.     struct FFV1Context *slice_context[MAX_SLICES];

  195.     int slice_count;

  196.     int num_v_slices;

  197.     int num_h_slices;

  198.     int slice_width;

  199.     int slice_height;

  200.     int slice_x;

  201.     int slice_y;

  202.     int bits_per_raw_sample;

  203. }FFV1Context;

  204. 

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

  206.     if(bits==8)

  207.         diff= (int8_t)diff;

  208.     else{

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

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

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

  212.     }

  213. 

  214.     return diff;

  215. }

  216. 

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

  218. {

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

  220.     const int  T= last[ 0];

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

  222. 

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

  224. }

  225. 

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

  227.                               int16_t *last, int16_t *last2)

  228. {

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

  230.     const int  T= last[ 0];

  231.     const int RT= last[ 1];

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

  233. 

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

  235.         const int TT= last2[0];

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

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

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

  239.     }else

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

  241. }

  242. 

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

  244.     int i,j,k,m;

  245.     double l2tab[256];

  246. 

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

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

  249. 

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

  251.         double best_len[256];

  252.         double p= i/256.0;

  253. 

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

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

  256. 

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

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

  259.             double len=0;

  260.             occ[j]=1.0;

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

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

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

  264.                     if(occ[m]){

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

  266.                                       + (1-p)*l2tab[256-m]);

  267.                     }

  268.                 }

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

  270.                     best_len[k]= len;

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

  272.                 }

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

  274.                     if(occ[m]){

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

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

  277.                     }

  278.                 }

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

  280.             }

  281.         }

  282.     }

  283. }

  284. 

  285. 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]){

  286.     int i;

  287. 

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

  289. do{\

  290.     if(rc_stat){\

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

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

  293.     }\

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

  295. }while(0)

  296. 

  297.     if(v){

  298.         const int a= FFABS(v);

  299.         const int e= av_log2(a);

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

  301.         if(e<=9){

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

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

  304.             }

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

  306. 

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

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

  309.             }

  310. 

  311.             if(is_signed)

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

  313.         }else{

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

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

  316.             }

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

  318. 

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

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

  321.             }

  322. 

  323.             if(is_signed)

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

  325.         }

  326.     }else{

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

  328.     }

  329. #undef put_rac

  330. }

  331. 

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

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

  334. }

  335. 

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

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

  338.         return 0;

  339.     else{

  340.         int i, e, a;

  341.         e= 0;

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

  343.             e++;

  344.         }

  345. 

  346.         a= 1;

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

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

  349.         }

  350. 

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

  352.         return (a^e)-e;

  353.     }

  354. }

  355. 

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

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

  358. }

  359. 

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

  361.     int drift= state->drift;

  362.     int count= state->count;

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

  364.     drift += v;

  365. 

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

  367.         count >>= 1;

  368.         drift >>= 1;

  369.         state->error_sum >>= 1;

  370.     }

  371.     count++;

  372. 

  373.     if(drift <= -count){

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

  375. 

  376.         drift += count;

  377.         if(drift <= -count)

  378.             drift= -count + 1;

  379.     }else if(drift > 0){

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

  381. 

  382.         drift -= count;

  383.         if(drift > 0)

  384.             drift= 0;

  385.     }

  386. 

  387.     state->drift= drift;

  388.     state->count= count;

  389. }

  390. 

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

  392.     int i, k, code;

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

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

  395. 

  396.     i= state->count;

  397.     k=0;

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

  399.         k++;

  400.         i += i;

  401.     }

  402. 

  403.     assert(k<=8);

  404. 

  405. #if 0 // JPEG LS

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

  407.     else                                         code= v;

  408. #else

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

  410. #endif

  411. 

  412. //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);

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

  414. 

  415.     update_vlc_state(state, v);

  416. }

  417. 

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

  419.     int k, i, v, ret;

  420. 

  421.     i= state->count;

  422.     k=0;

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

  424.         k++;

  425.         i += i;

  426.     }

  427. 

  428.     assert(k<=8);

  429. 

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

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

  432. 

  433. #if 0 // JPEG LS

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

  435. #else

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

  437. #endif

  438. 

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

  440. 

  441.     update_vlc_state(state, v);

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

  443.     return ret;

  444. }

  445. 

  446. #if CONFIG_FFV1_ENCODER

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

  448.                                         int16_t *sample[2],

  449.                                         int plane_index, int bits)

  450. {

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

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

  453.     int x;

  454.     int run_index= s->run_index;

  455.     int run_count=0;

  456.     int run_mode=0;

  457. 

  458.     if(s->ac){

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

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

  461.             return -1;

  462.         }

  463.     }else{

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

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

  466.             return -1;

  467.         }

  468.     }

  469. 

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

  471.         int diff, context;

  472. 

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

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

  475. 

  476.         if(context < 0){

  477.             context = -context;

  478.             diff= -diff;

  479.         }

  480. 

  481.         diff= fold(diff, bits);

  482. 

  483.         if(s->ac){

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

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

  486.             }else{

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

  488.             }

  489.         }else{

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

  491. 

  492.             if(run_mode){

  493. 

  494.                 if(diff){

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

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

  497.                         run_index++;

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

  499.                     }

  500. 

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

  502.                     if(run_index) run_index--;

  503.                     run_count=0;

  504.                     run_mode=0;

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

  506.                 }else{

  507.                     run_count++;

  508.                 }

  509.             }

  510. 

  511. //            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));

  512. 

  513.             if(run_mode == 0)

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

  515.         }

  516.     }

  517.     if(run_mode){

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

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

  520.             run_index++;

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

  522.         }

  523. 

  524.         if(run_count)

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

  526.     }

  527.     s->run_index= run_index;

  528. 

  529.     return 0;

  530. }

  531. 

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

  533.     int x,y,i;

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

  535.     int16_t *sample[3];

  536.     s->run_index=0;

  537. 

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

  539. 

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

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

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

  543. 

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

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

  546. //{START_TIMER

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

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

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

  550.             }

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

  552.         }else{

  553.             if(s->packed_at_lsb){

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

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

  556.                 }

  557.             }else{

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

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

  560.                 }

  561.             }

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

  563.         }

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

  565.     }

  566. }

  567. 

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

  569.     int x, y, p, i;

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

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

  572.     s->run_index=0;

  573. 

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

  575. 

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

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

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

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

  580. 

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

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

  583.             int b= v&0xFF;

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

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

  586.             int a=  v>>24;

  587. 

  588.             b -= g;

  589.             r -= g;

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

  591.             b += 0x100;

  592.             r += 0x100;

  593. 

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

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

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

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

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

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

  600.         }

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

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

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

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

  605.         }

  606.     }

  607. }

  608. 

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

  610.     int last=0;

  611.     int i;

  612.     uint8_t state[CONTEXT_SIZE];

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

  614. 

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

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

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

  618.             last= i;

  619.         }

  620.     }

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

  622. }

  623. 

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

  625.     int i;

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

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

  628. }

  629. 

  630. static void write_header(FFV1Context *f){

  631.     uint8_t state[CONTEXT_SIZE];

  632.     int i, j;

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

  634. 

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

  636. 

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

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

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

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

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

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

  643.             }

  644.         }

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

  646.         if(f->version>0)

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

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

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

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

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

  652. 

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

  654.     }else{

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

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

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

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

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

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

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

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

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

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

  665.             }

  666.         }

  667.     }

  668. }

  669. #endif /* CONFIG_FFV1_ENCODER */

  670. 

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

  672.     FFV1Context *s = avctx->priv_data;

  673. 

  674.     s->avctx= avctx;

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

  676. 

  677.     avcodec_get_frame_defaults(&s->picture);

  678. 

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

  680. 

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

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

  683. 

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

  685.     //defaults

  686.     s->num_h_slices=1;

  687.     s->num_v_slices=1;

  688. 

  689. 

  690.     return 0;

  691. }

  692. 

  693. static int init_slice_state(FFV1Context *f){

  694.     int i, j;

  695. 

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

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

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

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

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

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

  702. 

  703.             if(fs->ac){

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

  705.                 if(!p->    state)

  706.                     return AVERROR(ENOMEM);

  707.             }else{

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

  709.                 if(!p->vlc_state)

  710.                     return AVERROR(ENOMEM);

  711.             }

  712.         }

  713. 

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

  715.             //FIXME only redo if state_transition changed

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

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

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

  719.             }

  720.         }

  721.     }

  722. 

  723.     return 0;

  724. }

  725. 

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

  727.     int i;

  728. 

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

  730. 

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

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

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

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

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

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

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

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

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

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

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

  742. 

  743.         fs->slice_width = sxe - sxs;

  744.         fs->slice_height= sye - sys;

  745.         fs->slice_x     = sxs;

  746.         fs->slice_y     = sys;

  747. 

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

  749.         if (!fs->sample_buffer)

  750.             return AVERROR(ENOMEM);

  751.     }

  752.     return 0;

  753. }

  754. 

  755. static int allocate_initial_states(FFV1Context *f){

  756.     int i;

  757. 

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

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

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

  761.             return AVERROR(ENOMEM);

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

  763.     }

  764.     return 0;

  765. }

  766. 

  767. #if CONFIG_FFV1_ENCODER

  768. static int write_extra_header(FFV1Context *f){

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

  770.     uint8_t state[CONTEXT_SIZE];

  771.     int i, j, k;

  772.     uint8_t state2[32][CONTEXT_SIZE];

  773. 

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

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

  776. 

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

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

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

  780. 

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

  782.     if(f->version > 2)

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

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

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

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

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

  788.         }

  789.     }

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

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

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

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

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

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

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

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

  798. 

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

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

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

  802. 

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

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

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

  806.                 break;

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

  808.             put_rac(c, state, 1);

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

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

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

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

  813.                 }

  814.             }

  815.         }else{

  816.             put_rac(c, state, 0);

  817.         }

  818.     }

  819. 

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

  821. 

  822.     return 0;

  823. }

  824. 

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

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

  827. 

  828.     do{

  829.         changed=0;

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

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

  832. #define COST(old, new) \

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

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

  835. 

  836. #define COST2(old, new) \

  837.     COST(old, new)\

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

  839. 

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

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

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

  843.                     int j;

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

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

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

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

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

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

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

  851.                     }

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

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

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

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

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

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

  858.                         }

  859.                     }

  860.                     print=changed=1;

  861.                 }

  862.             }

  863.         }

  864.     }while(changed);

  865.     return print;

  866. }

  867. 

  868. static av_cold int encode_init(AVCodecContext *avctx)

  869. {

  870.     FFV1Context *s = avctx->priv_data;

  871.     int i, j, k, m;

  872. 

  873.     common_init(avctx);

  874. 

  875.     s->version=0;

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

  877. 

  878.     if(s->ac>1)

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

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

  881. 

  882.     s->plane_count=3;

  883.     switch(avctx->pix_fmt){

  884.     case PIX_FMT_YUV444P9:

  885.     case PIX_FMT_YUV422P9:

  886.     case PIX_FMT_YUV420P9:

  887.         if (!avctx->bits_per_raw_sample)

  888.             s->bits_per_raw_sample = 9;

  889.     case PIX_FMT_YUV444P10:

  890.     case PIX_FMT_YUV420P10:

  891.     case PIX_FMT_YUV422P10:

  892.         s->packed_at_lsb = 1;

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

  894.             s->bits_per_raw_sample = 10;

  895.     case PIX_FMT_GRAY16:

  896.     case PIX_FMT_YUV444P16:

  897.     case PIX_FMT_YUV422P16:

  898.     case PIX_FMT_YUV420P16:

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

  900.             s->bits_per_raw_sample = 16;

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

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

  903.         }

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

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

  906.             return -1;

  907.         }

  908.         if(!s->ac){

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

  910.             return -1;

  911.         }

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

  913.     case PIX_FMT_GRAY8:

  914.     case PIX_FMT_YUV444P:

  915.     case PIX_FMT_YUV440P:

  916.     case PIX_FMT_YUV422P:

  917.     case PIX_FMT_YUV420P:

  918.     case PIX_FMT_YUV411P:

  919.     case PIX_FMT_YUV410P:

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

  921.         s->colorspace= 0;

  922.         break;

  923.     case PIX_FMT_YUVA444P:

  924.     case PIX_FMT_YUVA420P:

  925.         s->chroma_planes= 1;

  926.         s->colorspace= 0;

  927.         s->transparency= 1;

  928.         break;

  929.     case PIX_FMT_RGB32:

  930.         s->colorspace= 1;

  931.         s->transparency= 1;

  932.         break;

  933.     case PIX_FMT_0RGB32:

  934.         s->colorspace= 1;

  935.         break;

  936.     default:

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

  938.         return -1;

  939.     }

  940.     if (s->transparency) {

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

  942.     }

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

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

  945.         return AVERROR(EINVAL);

  946.     }

  947. 

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

  949.         s->quant_table_count=2;

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

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

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

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

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

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

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

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

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

  959.         }else{

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

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

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

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

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

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

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

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

  968.         }

  969.     }

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

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

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

  973. 

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

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

  976. 

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

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

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

  980.     }

  981. 

  982.     if(allocate_initial_states(s) < 0)

  983.         return AVERROR(ENOMEM);

  984. 

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

  986.     if(!s->transparency)

  987.         s->plane_count= 2;

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

  989. 

  990.     s->picture_number=0;

  991. 

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

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

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

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

  996.                 return AVERROR(ENOMEM);

  997.         }

  998.     }

  999.     if(avctx->stats_in){

  1000.         char *p= avctx->stats_in;

  1001.         uint8_t best_state[256][256];

  1002.         int gob_count=0;

  1003.         char *next;

  1004. 

  1005.         av_assert0(s->version>=2);

  1006. 

  1007.         for(;;){

  1008.             for(j=0; j<256; j++){

  1009.                 for(i=0; i<2; i++){

  1010.                     s->rc_stat[j][i]= strtol(p, &next, 0);

  1011.                     if(next==p){

  1012.                         av_log(avctx, AV_LOG_ERROR, "2Pass file invalid at %d %d [%s]\n", j,i,p);

  1013.                         return -1;

  1014.                     }

  1015.                     p=next;

  1016.                 }

  1017.             }

  1018.             for(i=0; i<s->quant_table_count; i++){

  1019.                 for(j=0; j<s->context_count[i]; j++){

  1020.                     for(k=0; k<32; k++){

  1021.                         for(m=0; m<2; m++){

  1022.                             s->rc_stat2[i][j][k][m]= strtol(p, &next, 0);

  1023.                             if(next==p){

  1024.                                 av_log(avctx, AV_LOG_ERROR, "2Pass file invalid at %d %d %d %d [%s]\n", i,j,k,m,p);

  1025.                                 return -1;

  1026.                             }

  1027.                             p=next;

  1028.                         }

  1029.                     }

  1030.                 }

  1031.             }

  1032.             gob_count= strtol(p, &next, 0);

  1033.             if(next==p || gob_count <0){

  1034.                 av_log(avctx, AV_LOG_ERROR, "2Pass file invalid\n");

  1035.                 return -1;

  1036.             }

  1037.             p=next;

  1038.             while(*p=='\n' || *p==' ') p++;

  1039.             if(p[0]==0) break;

  1040.         }

  1041.         sort_stt(s, s->state_transition);

  1042. 

  1043.         find_best_state(best_state, s->state_transition);

  1044. 

  1045.         for(i=0; i<s->quant_table_count; i++){

  1046.             for(j=0; j<s->context_count[i]; j++){

  1047.                 for(k=0; k<32; k++){

  1048.                     double p= 128;

  1049.                     if(s->rc_stat2[i][j][k][0]+s->rc_stat2[i][j][k][1]){

  1050.                         p=256.0*s->rc_stat2[i][j][k][1] / (s->rc_stat2[i][j][k][0]+s->rc_stat2[i][j][k][1]);

  1051.                     }

  1052.                     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)];

  1053.                 }

  1054.             }

  1055.         }

  1056.     }

  1057. 

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

  1059.         s->num_h_slices=2;

  1060.         s->num_v_slices=2;

  1061.         write_extra_header(s);

  1062.     }

  1063. 

  1064.     if(init_slice_contexts(s) < 0)

  1065.         return -1;

  1066.     if(init_slice_state(s) < 0)

  1067.         return -1;

  1068. 

  1069. #define STATS_OUT_SIZE 1024*1024*6

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

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

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

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

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

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

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

  1077.                 if(!sf->rc_stat2[i])

  1078.                     return AVERROR(ENOMEM);

  1079.             }

  1080.         }

  1081.     }

  1082. 

  1083.     return 0;

  1084. }

  1085. #endif /* CONFIG_FFV1_ENCODER */

  1086. 

  1087. 

  1088. static void clear_state(FFV1Context *f){

  1089.     int i, si, j;

  1090. 

  1091.     for(si=0; si<f->slice_count; si++){

  1092.         FFV1Context *fs= f->slice_context[si];

  1093.         for(i=0; i<f->plane_count; i++){

  1094.             PlaneContext *p= &fs->plane[i];

  1095. 

  1096.             p->interlace_bit_state[0]= 128;

  1097.             p->interlace_bit_state[1]= 128;

  1098. 

  1099.             if(fs->ac){

  1100.                 if(f->initial_states[p->quant_table_index]){

  1101.                     memcpy(p->state, f->initial_states[p->quant_table_index], CONTEXT_SIZE*p->context_count);

  1102.                 }else

  1103.                 memset(p->state, 128, CONTEXT_SIZE*p->context_count);

  1104.             }else{

  1105.                 for(j=0; j<p->context_count; j++){

  1106.                     p->vlc_state[j].drift= 0;

  1107.                     p->vlc_state[j].error_sum= 4; //FFMAX((RANGE + 32)/64, 2);

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

  1109.                     p->vlc_state[j].count= 1;

  1110.                 }

  1111.             }

  1112.         }

  1113.     }

  1114. }

  1115. 

  1116. #if CONFIG_FFV1_ENCODER

  1117. static int encode_slice(AVCodecContext *c, void *arg){

  1118.     FFV1Context *fs= *(void**)arg;

  1119.     FFV1Context *f= fs->avctx->priv_data;

  1120.     int width = fs->slice_width;

  1121.     int height= fs->slice_height;

  1122.     int x= fs->slice_x;

  1123.     int y= fs->slice_y;

  1124.     AVFrame * const p= &f->picture;

  1125.     const int ps= (f->bits_per_raw_sample>8)+1;

  1126. 

  1127.     if(f->colorspace==0){

  1128.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1129.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1130.         const int cx= x>>f->chroma_h_shift;

  1131.         const int cy= y>>f->chroma_v_shift;

  1132. 

  1133.         encode_plane(fs, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0);

  1134. 

  1135.         if (f->chroma_planes){

  1136.             encode_plane(fs, p->data[1] + ps*cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  1137.             encode_plane(fs, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);

  1138.         }

  1139.         if (fs->transparency)

  1140.             encode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], 2);

  1141.     }else{

  1142.         encode_rgb_frame(fs, (uint32_t*)(p->data[0]) + ps*x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1143.     }

  1144.     emms_c();

  1145. 

  1146.     return 0;

  1147. }

  1148. 

  1149. static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,

  1150.                         const AVFrame *pict, int *got_packet)

  1151. {

  1152.     FFV1Context *f = avctx->priv_data;

  1153.     RangeCoder * const c= &f->slice_context[0]->c;

  1154.     AVFrame * const p= &f->picture;

  1155.     int used_count= 0;

  1156.     uint8_t keystate=128;

  1157.     uint8_t *buf_p;

  1158.     int i, ret;

  1159. 

  1160.     if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width*avctx->height*((8*2+1+1)*4)/8

  1161.                                   + FF_MIN_BUFFER_SIZE)) < 0)

  1162.         return ret;

  1163. 

  1164.     ff_init_range_encoder(c, pkt->data, pkt->size);

  1165.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1166. 

  1167.     *p = *pict;

  1168.     p->pict_type= AV_PICTURE_TYPE_I;

  1169. 

  1170.     if(avctx->gop_size==0 || f->picture_number % avctx->gop_size == 0){

  1171.         put_rac(c, &keystate, 1);

  1172.         p->key_frame= 1;

  1173.         f->gob_count++;

  1174.         write_header(f);

  1175.         clear_state(f);

  1176.     }else{

  1177.         put_rac(c, &keystate, 0);

  1178.         p->key_frame= 0;

  1179.     }

  1180. 

  1181.     if(!f->ac){

  1182.         used_count += ff_rac_terminate(c);

  1183. //printf("pos=%d\n", used_count);

  1184.         init_put_bits(&f->slice_context[0]->pb, pkt->data + used_count, pkt->size - used_count);

  1185.     }else if (f->ac>1){

  1186.         int i;

  1187.         for(i=1; i<256; i++){

  1188.             c->one_state[i]= f->state_transition[i];

  1189.             c->zero_state[256-i]= 256-c->one_state[i];

  1190.         }

  1191.     }

  1192. 

  1193.     for(i=1; i<f->slice_count; i++){

  1194.         FFV1Context *fs= f->slice_context[i];

  1195.         uint8_t *start = pkt->data + (pkt->size-used_count)*i/f->slice_count;

  1196.         int len = pkt->size/f->slice_count;

  1197. 

  1198.         if(fs->ac){

  1199.             ff_init_range_encoder(&fs->c, start, len);

  1200.         }else{

  1201.             init_put_bits(&fs->pb, start, len);

  1202.         }

  1203.     }

  1204.     avctx->execute(avctx, encode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1205. 

  1206.     buf_p = pkt->data;

  1207.     for(i=0; i<f->slice_count; i++){

  1208.         FFV1Context *fs= f->slice_context[i];

  1209.         int bytes;

  1210. 

  1211.         if(fs->ac){

  1212.             uint8_t state=128;

  1213.             put_rac(&fs->c, &state, 0);

  1214.             bytes= ff_rac_terminate(&fs->c);

  1215.         }else{

  1216.             flush_put_bits(&fs->pb); //nicer padding FIXME

  1217.             bytes= used_count + (put_bits_count(&fs->pb)+7)/8;

  1218.             used_count= 0;

  1219.         }

  1220.         if(i>0){

  1221.             av_assert0(bytes < pkt->size/f->slice_count);

  1222.             memmove(buf_p, fs->ac ? fs->c.bytestream_start : fs->pb.buf, bytes);

  1223.             av_assert0(bytes < (1<<24));

  1224.             AV_WB24(buf_p+bytes, bytes);

  1225.             bytes+=3;

  1226.         }

  1227.         buf_p += bytes;

  1228.     }

  1229. 

  1230.     if((avctx->flags&CODEC_FLAG_PASS1) && (f->picture_number&31)==0){

  1231.         int j, k, m;

  1232.         char *p= avctx->stats_out;

  1233.         char *end= p + STATS_OUT_SIZE;

  1234. 

  1235.         memset(f->rc_stat, 0, sizeof(f->rc_stat));

  1236.         for(i=0; i<f->quant_table_count; i++)

  1237.             memset(f->rc_stat2[i], 0, f->context_count[i]*sizeof(*f->rc_stat2[i]));

  1238. 

  1239.         for(j=0; j<f->slice_count; j++){

  1240.             FFV1Context *fs= f->slice_context[j];

  1241.             for(i=0; i<256; i++){

  1242.                 f->rc_stat[i][0] += fs->rc_stat[i][0];

  1243.                 f->rc_stat[i][1] += fs->rc_stat[i][1];

  1244.             }

  1245.             for(i=0; i<f->quant_table_count; i++){

  1246.                 for(k=0; k<f->context_count[i]; k++){

  1247.                     for(m=0; m<32; m++){

  1248.                         f->rc_stat2[i][k][m][0] += fs->rc_stat2[i][k][m][0];

  1249.                         f->rc_stat2[i][k][m][1] += fs->rc_stat2[i][k][m][1];

  1250.                     }

  1251.                 }

  1252.             }

  1253.         }

  1254. 

  1255.         for(j=0; j<256; j++){

  1256.             snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat[j][0], f->rc_stat[j][1]);

  1257.             p+= strlen(p);

  1258.         }

  1259.         snprintf(p, end-p, "\n");

  1260. 

  1261.         for(i=0; i<f->quant_table_count; i++){

  1262.             for(j=0; j<f->context_count[i]; j++){

  1263.                 for(m=0; m<32; m++){

  1264.                     snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat2[i][j][m][0], f->rc_stat2[i][j][m][1]);

  1265.                     p+= strlen(p);

  1266.                 }

  1267.             }

  1268.         }

  1269.         snprintf(p, end-p, "%d\n", f->gob_count);

  1270.     } else if(avctx->flags&CODEC_FLAG_PASS1)

  1271.         avctx->stats_out[0] = '\0';

  1272. 

  1273.     f->picture_number++;

  1274.     pkt->size   = buf_p - pkt->data;

  1275.     pkt->flags |= AV_PKT_FLAG_KEY*p->key_frame;

  1276.     *got_packet = 1;

  1277. 

  1278.     return 0;

  1279. }

  1280. #endif /* CONFIG_FFV1_ENCODER */

  1281. 

  1282. static av_cold int common_end(AVCodecContext *avctx){

  1283.     FFV1Context *s = avctx->priv_data;

  1284.     int i, j;

  1285. 

  1286.     if (avctx->codec->decode && s->picture.data[0])

  1287.         avctx->release_buffer(avctx, &s->picture);

  1288. 

  1289.     for(j=0; j<s->slice_count; j++){

  1290.         FFV1Context *fs= s->slice_context[j];

  1291.         for(i=0; i<s->plane_count; i++){

  1292.             PlaneContext *p= &fs->plane[i];

  1293. 

  1294.             av_freep(&p->state);

  1295.             av_freep(&p->vlc_state);

  1296.         }

  1297.         av_freep(&fs->sample_buffer);

  1298.     }

  1299. 

  1300.     av_freep(&avctx->stats_out);

  1301.     for(j=0; j<s->quant_table_count; j++){

  1302.         av_freep(&s->initial_states[j]);

  1303.         for(i=0; i<s->slice_count; i++){

  1304.             FFV1Context *sf= s->slice_context[i];

  1305.             av_freep(&sf->rc_stat2[j]);

  1306.         }

  1307.         av_freep(&s->rc_stat2[j]);

  1308.     }

  1309. 

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

  1311.         av_freep(&s->slice_context[i]);

  1312.     }

  1313. 

  1314.     return 0;

  1315. }

  1316. 

  1317. static av_always_inline void decode_line(FFV1Context *s, int w,

  1318.                                          int16_t *sample[2],

  1319.                                          int plane_index, int bits)

  1320. {

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

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

  1323.     int x;

  1324.     int run_count=0;

  1325.     int run_mode=0;

  1326.     int run_index= s->run_index;

  1327. 

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

  1329.         int diff, context, sign;

  1330. 

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

  1332.         if(context < 0){

  1333.             context= -context;

  1334.             sign=1;

  1335.         }else

  1336.             sign=0;

  1337. 

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

  1339. 

  1340.         if(s->ac){

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

  1342.         }else{

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

  1344. 

  1345.             if(run_mode){

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

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

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

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

  1350.                     }else{

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

  1352.                         else run_count=0;

  1353.                         if(run_index) run_index--;

  1354.                         run_mode=2;

  1355.                     }

  1356.                 }

  1357.                 run_count--;

  1358.                 if(run_count < 0){

  1359.                     run_mode=0;

  1360.                     run_count=0;

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

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

  1363.                 }else

  1364.                     diff=0;

  1365.             }else

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

  1367. 

  1368. //            printf("count:%d index:%d, mode:%d, x:%d y:%d pos:%d\n", run_count, run_index, run_mode, x, y, get_bits_count(&s->gb));

  1369.         }

  1370. 

  1371.         if(sign) diff= -diff;

  1372. 

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

  1374.     }

  1375.     s->run_index= run_index;

  1376. }

  1377. 

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

  1379.     int x, y;

  1380.     int16_t *sample[2];

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

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

  1383. 

  1384.     s->run_index=0;

  1385. 

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

  1387. 

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

  1389.         int16_t *temp = sample[0]; //FIXME try a normal buffer

  1390. 

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

  1392.         sample[1]= temp;

  1393. 

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

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

  1396. 

  1397. //{START_TIMER

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

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

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

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

  1402.             }

  1403.         }else{

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

  1405.             if(s->packed_at_lsb){

  1406.                 for(x=0; x<w; x++){

  1407.                     ((uint16_t*)(src + stride*y))[x]= sample[1][x];

  1408.                 }

  1409.             }else{

  1410.                 for(x=0; x<w; x++){

  1411.                     ((uint16_t*)(src + stride*y))[x]= sample[1][x] << (16 - s->avctx->bits_per_raw_sample);

  1412.                 }

  1413.             }

  1414.         }

  1415. //STOP_TIMER("decode-line")}

  1416.     }

  1417. }

  1418. 

  1419. static void decode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){

  1420.     int x, y, p;

  1421.     int16_t *sample[4][2];

  1422.     for(x=0; x<4; x++){

  1423.         sample[x][0] = s->sample_buffer +  x*2   *(w+6) + 3;

  1424.         sample[x][1] = s->sample_buffer + (x*2+1)*(w+6) + 3;

  1425.     }

  1426. 

  1427.     s->run_index=0;

  1428. 

  1429.     memset(s->sample_buffer, 0, 8*(w+6)*sizeof(*s->sample_buffer));

  1430. 

  1431.     for(y=0; y<h; y++){

  1432.         for(p=0; p<3 + s->transparency; p++){

  1433.             int16_t *temp = sample[p][0]; //FIXME try a normal buffer

  1434. 

  1435.             sample[p][0]= sample[p][1];

  1436.             sample[p][1]= temp;

  1437. 

  1438.             sample[p][1][-1]= sample[p][0][0  ];

  1439.             sample[p][0][ w]= sample[p][0][w-1];

  1440.             decode_line(s, w, sample[p], (p+1)/2, 9);

  1441.         }

  1442.         for(x=0; x<w; x++){

  1443.             int g= sample[0][1][x];

  1444.             int b= sample[1][1][x];

  1445.             int r= sample[2][1][x];

  1446.             int a= sample[3][1][x];

  1447. 

  1448. //            assert(g>=0 && b>=0 && r>=0);

  1449. //            assert(g<256 && b<512 && r<512);

  1450. 

  1451.             b -= 0x100;

  1452.             r -= 0x100;

  1453.             g -= (b + r)>>2;

  1454.             b += g;

  1455.             r += g;

  1456. 

  1457.             src[x + stride*y]= b + (g<<8) + (r<<16) + (a<<24);

  1458.         }

  1459.     }

  1460. }

  1461. 

  1462. static int decode_slice(AVCodecContext *c, void *arg){

  1463.     FFV1Context *fs= *(void**)arg;

  1464.     FFV1Context *f= fs->avctx->priv_data;

  1465.     int width = fs->slice_width;

  1466.     int height= fs->slice_height;

  1467.     int x= fs->slice_x;

  1468.     int y= fs->slice_y;

  1469.     const int ps= (c->bits_per_raw_sample>8)+1;

  1470.     AVFrame * const p= &f->picture;

  1471. 

  1472.     av_assert1(width && height);

  1473.     if(f->colorspace==0){

  1474.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1475.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1476.         const int cx= x>>f->chroma_h_shift;

  1477.         const int cy= y>>f->chroma_v_shift;

  1478.         decode_plane(fs, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0);

  1479. 

  1480.         if (f->chroma_planes){

  1481.             decode_plane(fs, p->data[1] + ps*cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  1482.             decode_plane(fs, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);

  1483.         }

  1484.         if (fs->transparency)

  1485.             decode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], 2);

  1486.     }else{

  1487.         decode_rgb_frame(fs, (uint32_t*)p->data[0] + ps*x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1488.     }

  1489. 

  1490.     emms_c();

  1491. 

  1492.     return 0;

  1493. }

  1494. 

  1495. static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale){

  1496.     int v;

  1497.     int i=0;

  1498.     uint8_t state[CONTEXT_SIZE];

  1499. 

  1500.     memset(state, 128, sizeof(state));

  1501. 

  1502.     for(v=0; i<128 ; v++){

  1503.         int len= get_symbol(c, state, 0) + 1;

  1504. 

  1505.         if(len + i > 128) return -1;

  1506. 

  1507.         while(len--){

  1508.             quant_table[i] = scale*v;

  1509.             i++;

  1510. //printf("%2d ",v);

  1511. //if(i%16==0) printf("\n");

  1512.         }

  1513.     }

  1514. 

  1515.     for(i=1; i<128; i++){

  1516.         quant_table[256-i]= -quant_table[i];

  1517.     }

  1518.     quant_table[128]= -quant_table[127];

  1519. 

  1520.     return 2*v - 1;

  1521. }

  1522. 

  1523. static int read_quant_tables(RangeCoder *c, int16_t quant_table[MAX_CONTEXT_INPUTS][256]){

  1524.     int i;

  1525.     int context_count=1;

  1526. 

  1527.     for(i=0; i<5; i++){

  1528.         context_count*= read_quant_table(c, quant_table[i], context_count);

  1529.         if(context_count > 32768U){

  1530.             return -1;

  1531.         }

  1532.     }

  1533.     return (context_count+1)/2;

  1534. }

  1535. 

  1536. static int read_extra_header(FFV1Context *f){

  1537.     RangeCoder * const c= &f->c;

  1538.     uint8_t state[CONTEXT_SIZE];

  1539.     int i, j, k;

  1540.     uint8_t state2[32][CONTEXT_SIZE];

  1541. 

  1542.     memset(state2, 128, sizeof(state2));

  1543.     memset(state, 128, sizeof(state));

  1544. 

  1545.     ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);

  1546.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1547. 

  1548.     f->version= get_symbol(c, state, 0);

  1549.     if(f->version > 2)

  1550.         f->minor_version= get_symbol(c, state, 0);

  1551.     f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1552.     if(f->ac>1){

  1553.         for(i=1; i<256; i++){

  1554.             f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1555.         }

  1556.     }

  1557.     f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1558.     f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1559.     get_rac(c, state); //no chroma = false

  1560.     f->chroma_h_shift= get_symbol(c, state, 0);

  1561.     f->chroma_v_shift= get_symbol(c, state, 0);

  1562.     f->transparency= get_rac(c, state);

  1563.     f->plane_count= 2 + f->transparency;

  1564.     f->num_h_slices= 1 + get_symbol(c, state, 0);

  1565.     f->num_v_slices= 1 + get_symbol(c, state, 0);

  1566.     if(f->num_h_slices > (unsigned)f->width || f->num_v_slices > (unsigned)f->height){

  1567.         av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");

  1568.         return -1;

  1569.     }

  1570. 

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

  1572.     if(f->quant_table_count > (unsigned)MAX_QUANT_TABLES)

  1573.         return -1;

  1574.     for(i=0; i<f->quant_table_count; i++){

  1575.         if((f->context_count[i]= read_quant_tables(c, f->quant_tables[i])) < 0){

  1576.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1577.             return -1;

  1578.         }

  1579.     }

  1580. 

  1581.     if(allocate_initial_states(f) < 0)

  1582.         return AVERROR(ENOMEM);

  1583. 

  1584.     for(i=0; i<f->quant_table_count; i++){

  1585.         if(get_rac(c, state)){

  1586.             for(j=0; j<f->context_count[i]; j++){

  1587.                 for(k=0; k<CONTEXT_SIZE; k++){

  1588.                     int pred= j ? f->initial_states[i][j-1][k] : 128;

  1589.                     f->initial_states[i][j][k]= (pred+get_symbol(c, state2[k], 1))&0xFF;

  1590.                 }

  1591.             }

  1592.         }

  1593.     }

  1594. 

  1595.     return 0;

  1596. }

  1597. 

  1598. static int read_header(FFV1Context *f){

  1599.     uint8_t state[CONTEXT_SIZE];

  1600.     int i, j, context_count;

  1601.     RangeCoder * const c= &f->slice_context[0]->c;

  1602. 

  1603.     memset(state, 128, sizeof(state));

  1604. 

  1605.     if(f->version < 2){

  1606.         f->version= get_symbol(c, state, 0);

  1607.         f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1608.         if(f->ac>1){

  1609.             for(i=1; i<256; i++){

  1610.                 f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1611.             }

  1612.         }

  1613.         f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1614.         if(f->version>0)

  1615.             f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1616.         f->chroma_planes= get_rac(c, state);

  1617.         f->chroma_h_shift= get_symbol(c, state, 0);

  1618.         f->chroma_v_shift= get_symbol(c, state, 0);

  1619.         f->transparency= get_rac(c, state);

  1620.         f->plane_count= 2 + f->transparency;

  1621.     }

  1622. 

  1623.     if(f->colorspace==0){

  1624.         if(!f->transparency && !f->chroma_planes){

  1625.             if (f->avctx->bits_per_raw_sample<=8)

  1626.                 f->avctx->pix_fmt= PIX_FMT_GRAY8;

  1627.             else

  1628.                 f->avctx->pix_fmt= PIX_FMT_GRAY16;

  1629.         }else if(f->avctx->bits_per_raw_sample<=8 && !f->transparency){

  1630.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1631.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;

  1632.             case 0x01: f->avctx->pix_fmt= PIX_FMT_YUV440P; break;

  1633.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;

  1634.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;

  1635.             case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;

  1636.             case 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  1637.             default:

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

  1639.                 return -1;

  1640.             }

  1641.         }else if(f->avctx->bits_per_raw_sample<=8 && f->transparency){

  1642.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1643.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUVA444P; break;

  1644.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUVA420P; break;

  1645.             default:

  1646.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1647.                 return -1;

  1648.             }

  1649.         }else if(f->avctx->bits_per_raw_sample==9) {

  1650.             f->packed_at_lsb=1;

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

  1652.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P9; break;

  1653.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P9; break;

  1654.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P9; break;

  1655.             default:

  1656.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1657.                 return -1;

  1658.             }

  1659.         }else if(f->avctx->bits_per_raw_sample==10) {

  1660.             f->packed_at_lsb=1;

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

  1662.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P10; break;

  1663.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P10; break;

  1664.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P10; break;

  1665.             default:

  1666.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1667.                 return -1;

  1668.             }

  1669.         }else {

  1670.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1671.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1672.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  1673.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P16; break;

  1674.             default:

  1675.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1676.                 return -1;

  1677.             }

  1678.         }

  1679.     }else if(f->colorspace==1){

  1680.         if(f->chroma_h_shift || f->chroma_v_shift){

  1681.             av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");

  1682.             return -1;

  1683.         }

  1684.         if(f->transparency) f->avctx->pix_fmt= PIX_FMT_RGB32;

  1685.         else                f->avctx->pix_fmt= PIX_FMT_0RGB32;

  1686.     }else{

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

  1688.         return -1;

  1689.     }

  1690. 

  1691. //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

  1692.     if(f->version < 2){

  1693.         context_count= read_quant_tables(c, f->quant_table);

  1694.         if(context_count < 0){

  1695.                 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1696.                 return -1;

  1697.         }

  1698.     }else{

  1699.         f->slice_count= get_symbol(c, state, 0);

  1700.         if(f->slice_count > (unsigned)MAX_SLICES)

  1701.             return -1;

  1702.     }

  1703. 

  1704.     for(j=0; j<f->slice_count; j++){

  1705.         FFV1Context *fs= f->slice_context[j];

  1706.         fs->ac= f->ac;

  1707.         fs->packed_at_lsb= f->packed_at_lsb;

  1708. 

  1709.         if(f->version >= 2){

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

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

  1712.             fs->slice_width =(get_symbol(c, state, 0)+1)*f->width  + fs->slice_x;

  1713.             fs->slice_height=(get_symbol(c, state, 0)+1)*f->height + fs->slice_y;

  1714. 

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

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

  1717.             fs->slice_width  = fs->slice_width /f->num_h_slices - fs->slice_x;

  1718.             fs->slice_height = fs->slice_height/f->num_v_slices - fs->slice_y;

  1719.             if((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height)

  1720.                 return -1;

  1721.             if(    (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width

  1722.                 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

  1723.                 return -1;

  1724.         }

  1725. 

  1726.         for(i=0; i<f->plane_count; i++){

  1727.             PlaneContext * const p= &fs->plane[i];

  1728. 

  1729.             if(f->version >= 2){

  1730.                 int idx=get_symbol(c, state, 0);

  1731.                 if(idx > (unsigned)f->quant_table_count){

  1732.                     av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");

  1733.                     return -1;

  1734.                 }

  1735.                 p->quant_table_index= idx;

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

  1737.                 context_count= f->context_count[idx];

  1738.             }else{

  1739.                 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));

  1740.             }

  1741. 

  1742.             if(p->context_count < context_count){

  1743.                 av_freep(&p->state);

  1744.                 av_freep(&p->vlc_state);

  1745.             }

  1746.             p->context_count= context_count;

  1747.         }

  1748.     }

  1749. 

  1750.     return 0;

  1751. }

  1752. 

  1753. static av_cold int decode_init(AVCodecContext *avctx)

  1754. {

  1755.     FFV1Context *f = avctx->priv_data;

  1756. 

  1757.     common_init(avctx);

  1758. 

  1759.     if(avctx->extradata && read_extra_header(f) < 0)

  1760.         return -1;

  1761. 

  1762.     if(init_slice_contexts(f) < 0)

  1763.         return -1;

  1764. 

  1765.     return 0;

  1766. }

  1767. 

  1768. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  1769.     const uint8_t *buf = avpkt->data;

  1770.     int buf_size = avpkt->size;

  1771.     FFV1Context *f = avctx->priv_data;

  1772.     RangeCoder * const c= &f->slice_context[0]->c;

  1773.     AVFrame * const p= &f->picture;

  1774.     int bytes_read, i;

  1775.     uint8_t keystate= 128;

  1776.     const uint8_t *buf_p;

  1777. 

  1778.     AVFrame *picture = data;

  1779. 

  1780.     /* release previously stored data */

  1781.     if (p->data[0])

  1782.         avctx->release_buffer(avctx, p);

  1783. 

  1784.     ff_init_range_decoder(c, buf, buf_size);

  1785.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1786. 

  1787. 

  1788.     p->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P

  1789.     if(get_rac(c, &keystate)){

  1790.         p->key_frame= 1;

  1791.         if(read_header(f) < 0)

  1792.             return -1;

  1793.         if(init_slice_state(f) < 0)

  1794.             return -1;

  1795. 

  1796.         clear_state(f);

  1797.     }else{

  1798.         p->key_frame= 0;

  1799.     }

  1800.     if(f->ac>1){

  1801.         int i;

  1802.         for(i=1; i<256; i++){

  1803.             c->one_state[i]= f->state_transition[i];

  1804.             c->zero_state[256-i]= 256-c->one_state[i];

  1805.         }

  1806.     }

  1807. 

  1808.     p->reference= 0;

  1809.     if(avctx->get_buffer(avctx, p) < 0){

  1810.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1811.         return -1;

  1812.     }

  1813. 

  1814.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  1815.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  1816. 

  1817.     if(!f->ac){

  1818.         bytes_read = c->bytestream - c->bytestream_start - 1;

  1819.         if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME

  1820. //printf("pos=%d\n", bytes_read);

  1821.         init_get_bits(&f->slice_context[0]->gb, buf + bytes_read, (buf_size - bytes_read) * 8);

  1822.     } else {

  1823.         bytes_read = 0; /* avoid warning */

  1824.     }

  1825. 

  1826.     buf_p= buf + buf_size;

  1827.     for(i=f->slice_count-1; i>0; i--){

  1828.         FFV1Context *fs= f->slice_context[i];

  1829.         int v= AV_RB24(buf_p-3)+3;

  1830.         if(buf_p - buf <= v){

  1831.             av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");

  1832.             return -1;

  1833.         }

  1834.         buf_p -= v;

  1835.         if(fs->ac){

  1836.             ff_init_range_decoder(&fs->c, buf_p, v);

  1837.         }else{

  1838.             init_get_bits(&fs->gb, buf_p, v * 8);

  1839.         }

  1840.     }

  1841. 

  1842.     avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1843.     f->picture_number++;

  1844. 

  1845.     *picture= *p;

  1846.     *data_size = sizeof(AVFrame);

  1847. 

  1848.     return buf_size;

  1849. }

  1850. 

  1851. AVCodec ff_ffv1_decoder = {

  1852.     .name           = "ffv1",

  1853.     .type           = AVMEDIA_TYPE_VIDEO,

  1854.     .id             = CODEC_ID_FFV1,

  1855.     .priv_data_size = sizeof(FFV1Context),

  1856.     .init           = decode_init,

  1857.     .close          = common_end,

  1858.     .decode         = decode_frame,

  1859.     .capabilities   = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ |

  1860.                       CODEC_CAP_SLICE_THREADS,

  1861.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1862. };

  1863. 

  1864. #if CONFIG_FFV1_ENCODER

  1865. AVCodec ff_ffv1_encoder = {

  1866.     .name           = "ffv1",

  1867.     .type           = AVMEDIA_TYPE_VIDEO,

  1868.     .id             = CODEC_ID_FFV1,

  1869.     .priv_data_size = sizeof(FFV1Context),

  1870.     .init           = encode_init,

  1871.     .encode2        = encode_frame,

  1872.     .close          = common_end,

  1873.     .capabilities   = CODEC_CAP_SLICE_THREADS,

  1874.     .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},

  1875.     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1876. };

  1877. #endif