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FFmpeg/libavcodec/ffv1.c

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  1. /*

  2.  * FFV1 codec for libavcodec

  3.  *

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

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

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

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

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

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

  12.  *

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

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

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

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

  21.  */

  22. 

  23. /**

  24.  * @file

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

  26.  */

  27. 

  28. #include "avcodec.h"

  29. #include "get_bits.h"

  30. #include "put_bits.h"

  31. #include "dsputil.h"

  32. #include "rangecoder.h"

  33. #include "golomb.h"

  34. #include "mathops.h"

  35. #include "libavutil/pixdesc.h"

  36. #include "libavutil/avassert.h"

  37. 

  38. #define MAX_PLANES 4

  39. #define CONTEXT_SIZE 32

  40. 

  41. #define MAX_QUANT_TABLES 8

  42. #define MAX_CONTEXT_INPUTS 5

  43. 

  44. extern const uint8_t ff_log2_run[41];

  45. 

  46. static const int8_t quant5_10bit[256]={

  47.  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,

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

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

  50.  1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

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

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

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

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

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

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

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

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

  59. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,

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

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

  62. -1,-1,-1,-1,-1,-1,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,

  63. };

  64. 

  65. static const int8_t quant5[256]={

  66.  0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  81. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,-1,

  82. };

  83. 

  84. static const int8_t quant9_10bit[256]={

  85.  0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2,

  86.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3,

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

  88.  3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

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

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

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

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

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

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

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

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

  97. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,

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

  99. -3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  100. -2,-2,-2,-2,-1,-1,-1,-1,-1,-1,-1,-1,-0,-0,-0,-0,

  101. };

  102. 

  103. static const int8_t quant11[256]={

  104.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

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

  106.  4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

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

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

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

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

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

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

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

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

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

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

  117. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-4,-4,

  118. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  119. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  120. };

  121. 

  122. static const uint8_t ver2_state[256]= {

  123.    0,  10,  10,  10,  10,  16,  16,  16,  28,  16,  16,  29,  42,  49,  20,  49,

  124.   59,  25,  26,  26,  27,  31,  33,  33,  33,  34,  34,  37,  67,  38,  39,  39,

  125.   40,  40,  41,  79,  43,  44,  45,  45,  48,  48,  64,  50,  51,  52,  88,  52,

  126.   53,  74,  55,  57,  58,  58,  74,  60, 101,  61,  62,  84,  66,  66,  68,  69,

  127.   87,  82,  71,  97,  73,  73,  82,  75, 111,  77,  94,  78,  87,  81,  83,  97,

  128.   85,  83,  94,  86,  99,  89,  90,  99, 111,  92,  93, 134,  95,  98, 105,  98,

  129.  105, 110, 102, 108, 102, 118, 103, 106, 106, 113, 109, 112, 114, 112, 116, 125,

  130.  115, 116, 117, 117, 126, 119, 125, 121, 121, 123, 145, 124, 126, 131, 127, 129,

  131.  165, 130, 132, 138, 133, 135, 145, 136, 137, 139, 146, 141, 143, 142, 144, 148,

  132.  147, 155, 151, 149, 151, 150, 152, 157, 153, 154, 156, 168, 158, 162, 161, 160,

  133.  172, 163, 169, 164, 166, 184, 167, 170, 177, 174, 171, 173, 182, 176, 180, 178,

  134.  175, 189, 179, 181, 186, 183, 192, 185, 200, 187, 191, 188, 190, 197, 193, 196,

  135.  197, 194, 195, 196, 198, 202, 199, 201, 210, 203, 207, 204, 205, 206, 208, 214,

  136.  209, 211, 221, 212, 213, 215, 224, 216, 217, 218, 219, 220, 222, 228, 223, 225,

  137.  226, 224, 227, 229, 240, 230, 231, 232, 233, 234, 235, 236, 238, 239, 237, 242,

  138.  241, 243, 242, 244, 245, 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 255,

  139. };

  140. 

  141. typedef struct VlcState{

  142.     int16_t drift;

  143.     uint16_t error_sum;

  144.     int8_t bias;

  145.     uint8_t count;

  146. } VlcState;

  147. 

  148. typedef struct PlaneContext{

  149.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

  150.     int quant_table_index;

  151.     int context_count;

  152.     uint8_t (*state)[CONTEXT_SIZE];

  153.     VlcState *vlc_state;

  154.     uint8_t interlace_bit_state[2];

  155. } PlaneContext;

  156. 

  157. #define MAX_SLICES 256

  158. 

  159. typedef struct FFV1Context{

  160.     AVCodecContext *avctx;

  161.     RangeCoder c;

  162.     GetBitContext gb;

  163.     PutBitContext pb;

  164.     uint64_t rc_stat[256][2];

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

  166.     int version;

  167.     int width, height;

  168.     int chroma_h_shift, chroma_v_shift;

  169.     int chroma_planes;

  170.     int transparency;

  171.     int flags;

  172.     int picture_number;

  173.     AVFrame picture;

  174.     int plane_count;

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

  176.     PlaneContext plane[MAX_PLANES];

  177.     int16_t quant_table[MAX_CONTEXT_INPUTS][256];

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

  179.     int context_count[MAX_QUANT_TABLES];

  180.     uint8_t state_transition[256];

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

  182.     int run_index;

  183.     int colorspace;

  184.     int16_t *sample_buffer;

  185.     int gob_count;

  186.     int packed_at_lsb;

  187. 

  188.     int quant_table_count;

  189. 

  190.     DSPContext dsp;

  191. 

  192.     struct FFV1Context *slice_context[MAX_SLICES];

  193.     int slice_count;

  194.     int num_v_slices;

  195.     int num_h_slices;

  196.     int slice_width;

  197.     int slice_height;

  198.     int slice_x;

  199.     int slice_y;

  200.     int bits_per_raw_sample;

  201. }FFV1Context;

  202. 

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

  204.     if(bits==8)

  205.         diff= (int8_t)diff;

  206.     else{

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

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

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

  210.     }

  211. 

  212.     return diff;

  213. }

  214. 

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

  216. {

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

  218.     const int  T= last[ 0];

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

  220. 

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

  222. }

  223. 

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

  225.                               int16_t *last, int16_t *last2)

  226. {

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

  228.     const int  T= last[ 0];

  229.     const int RT= last[ 1];

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

  231. 

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

  233.         const int TT= last2[0];

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

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

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

  237.     }else

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

  239. }

  240. 

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

  242.     int i,j,k,m;

  243.     double l2tab[256];

  244. 

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

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

  247. 

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

  249.         double best_len[256];

  250.         double p= i/256.0;

  251. 

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

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

  254. 

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

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

  257.             double len=0;

  258.             occ[j]=1.0;

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

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

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

  262.                     if(occ[m]){

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

  264.                                       + (1-p)*l2tab[256-m]);

  265.                     }

  266.                 }

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

  268.                     best_len[k]= len;

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

  270.                 }

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

  272.                     if(occ[m]){

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

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

  275.                     }

  276.                 }

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

  278.             }

  279.         }

  280.     }

  281. }

  282. 

  283. 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]){

  284.     int i;

  285. 

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

  287. do{\

  288.     if(rc_stat){\

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

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

  291.     }\

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

  293. }while(0)

  294. 

  295.     if(v){

  296.         const int a= FFABS(v);

  297.         const int e= av_log2(a);

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

  299.         if(e<=9){

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

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

  302.             }

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

  304. 

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

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

  307.             }

  308. 

  309.             if(is_signed)

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

  311.         }else{

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

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

  314.             }

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

  316. 

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

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

  319.             }

  320. 

  321.             if(is_signed)

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

  323.         }

  324.     }else{

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

  326.     }

  327. #undef put_rac

  328. }

  329. 

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

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

  332. }

  333. 

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

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

  336.         return 0;

  337.     else{

  338.         int i, e, a;

  339.         e= 0;

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

  341.             e++;

  342.         }

  343. 

  344.         a= 1;

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

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

  347.         }

  348. 

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

  350.         return (a^e)-e;

  351.     }

  352. }

  353. 

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

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

  356. }

  357. 

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

  359.     int drift= state->drift;

  360.     int count= state->count;

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

  362.     drift += v;

  363. 

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

  365.         count >>= 1;

  366.         drift >>= 1;

  367.         state->error_sum >>= 1;

  368.     }

  369.     count++;

  370. 

  371.     if(drift <= -count){

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

  373. 

  374.         drift += count;

  375.         if(drift <= -count)

  376.             drift= -count + 1;

  377.     }else if(drift > 0){

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

  379. 

  380.         drift -= count;

  381.         if(drift > 0)

  382.             drift= 0;

  383.     }

  384. 

  385.     state->drift= drift;

  386.     state->count= count;

  387. }

  388. 

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

  390.     int i, k, code;

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

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

  393. 

  394.     i= state->count;

  395.     k=0;

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

  397.         k++;

  398.         i += i;

  399.     }

  400. 

  401.     assert(k<=8);

  402. 

  403. #if 0 // JPEG LS

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

  405.     else                                         code= v;

  406. #else

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

  408. #endif

  409. 

  410. //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);

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

  412. 

  413.     update_vlc_state(state, v);

  414. }

  415. 

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

  417.     int k, i, v, ret;

  418. 

  419.     i= state->count;

  420.     k=0;

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

  422.         k++;

  423.         i += i;

  424.     }

  425. 

  426.     assert(k<=8);

  427. 

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

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

  430. 

  431. #if 0 // JPEG LS

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

  433. #else

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

  435. #endif

  436. 

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

  438. 

  439.     update_vlc_state(state, v);

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

  441.     return ret;

  442. }

  443. 

  444. #if CONFIG_FFV1_ENCODER

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

  446.                                         int16_t *sample[2],

  447.                                         int plane_index, int bits)

  448. {

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

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

  451.     int x;

  452.     int run_index= s->run_index;

  453.     int run_count=0;

  454.     int run_mode=0;

  455. 

  456.     if(s->ac){

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

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

  459.             return -1;

  460.         }

  461.     }else{

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

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

  464.             return -1;

  465.         }

  466.     }

  467. 

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

  469.         int diff, context;

  470. 

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

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

  473. 

  474.         if(context < 0){

  475.             context = -context;

  476.             diff= -diff;

  477.         }

  478. 

  479.         diff= fold(diff, bits);

  480. 

  481.         if(s->ac){

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

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

  484.             }else{

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

  486.             }

  487.         }else{

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

  489. 

  490.             if(run_mode){

  491. 

  492.                 if(diff){

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

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

  495.                         run_index++;

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

  497.                     }

  498. 

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

  500.                     if(run_index) run_index--;

  501.                     run_count=0;

  502.                     run_mode=0;

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

  504.                 }else{

  505.                     run_count++;

  506.                 }

  507.             }

  508. 

  509. //            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));

  510. 

  511.             if(run_mode == 0)

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

  513.         }

  514.     }

  515.     if(run_mode){

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

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

  518.             run_index++;

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

  520.         }

  521. 

  522.         if(run_count)

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

  524.     }

  525.     s->run_index= run_index;

  526. 

  527.     return 0;

  528. }

  529. 

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

  531.     int x,y,i;

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

  533.     int16_t *sample[3];

  534.     s->run_index=0;

  535. 

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

  537. 

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

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

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

  541. 

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

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

  544. //{START_TIMER

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

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

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

  548.             }

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

  550.         }else{

  551.             if(s->packed_at_lsb){

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

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

  554.                 }

  555.             }else{

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

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

  558.                 }

  559.             }

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

  561.         }

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

  563.     }

  564. }

  565. 

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

  567.     int x, y, p, i;

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

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

  570.     s->run_index=0;

  571. 

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

  573. 

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

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

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

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

  578. 

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

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

  581.             int b= v&0xFF;

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

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

  584.             int a=  v>>24;

  585. 

  586.             b -= g;

  587.             r -= g;

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

  589.             b += 0x100;

  590.             r += 0x100;

  591. 

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

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

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

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

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

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

  598.         }

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

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

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

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

  603.         }

  604.     }

  605. }

  606. 

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

  608.     int last=0;

  609.     int i;

  610.     uint8_t state[CONTEXT_SIZE];

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

  612. 

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

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

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

  616.             last= i;

  617.         }

  618.     }

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

  620. }

  621. 

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

  623.     int i;

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

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

  626. }

  627. 

  628. static void write_header(FFV1Context *f){

  629.     uint8_t state[CONTEXT_SIZE];

  630.     int i, j;

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

  632. 

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

  634. 

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

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

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

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

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

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

  641.             }

  642.         }

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

  644.         if(f->version>0)

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

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

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

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

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

  650. 

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

  652.     }else{

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

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

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

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

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

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

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

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

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

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

  663.             }

  664.         }

  665.     }

  666. }

  667. #endif /* CONFIG_FFV1_ENCODER */

  668. 

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

  670.     FFV1Context *s = avctx->priv_data;

  671. 

  672.     s->avctx= avctx;

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

  674. 

  675.     avcodec_get_frame_defaults(&s->picture);

  676. 

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

  678. 

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

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

  681. 

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

  683.     //defaults

  684.     s->num_h_slices=1;

  685.     s->num_v_slices=1;

  686. 

  687. 

  688.     return 0;

  689. }

  690. 

  691. static int init_slice_state(FFV1Context *f){

  692.     int i, j;

  693. 

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

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

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

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

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

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

  700. 

  701.             if(fs->ac){

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

  703.                 if(!p->    state)

  704.                     return AVERROR(ENOMEM);

  705.             }else{

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

  707.                 if(!p->vlc_state)

  708.                     return AVERROR(ENOMEM);

  709.             }

  710.         }

  711. 

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

  713.             //FIXME only redo if state_transition changed

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

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

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

  717.             }

  718.         }

  719.     }

  720. 

  721.     return 0;

  722. }

  723. 

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

  725.     int i;

  726. 

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

  728. 

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

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

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

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

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

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

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

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

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

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

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

  740. 

  741.         fs->slice_width = sxe - sxs;

  742.         fs->slice_height= sye - sys;

  743.         fs->slice_x     = sxs;

  744.         fs->slice_y     = sys;

  745. 

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

  747.         if (!fs->sample_buffer)

  748.             return AVERROR(ENOMEM);

  749.     }

  750.     return 0;

  751. }

  752. 

  753. static int allocate_initial_states(FFV1Context *f){

  754.     int i;

  755. 

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

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

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

  759.             return AVERROR(ENOMEM);

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

  761.     }

  762.     return 0;

  763. }

  764. 

  765. #if CONFIG_FFV1_ENCODER

  766. static int write_extra_header(FFV1Context *f){

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

  768.     uint8_t state[CONTEXT_SIZE];

  769.     int i, j, k;

  770.     uint8_t state2[32][CONTEXT_SIZE];

  771. 

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

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

  774. 

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

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

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

  778. 

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

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

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

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

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

  784.         }

  785.     }

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

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

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

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

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

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

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

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

  794. 

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

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

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

  798. 

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

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

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

  802.                 break;

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

  804.             put_rac(c, state, 1);

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

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

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

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

  809.                 }

  810.             }

  811.         }else{

  812.             put_rac(c, state, 0);

  813.         }

  814.     }

  815. 

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

  817. 

  818.     return 0;

  819. }

  820. 

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

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

  823. 

  824.     do{

  825.         changed=0;

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

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

  828. #define COST(old, new) \

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

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

  831. 

  832. #define COST2(old, new) \

  833.     COST(old, new)\

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

  835. 

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

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

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

  839.                     int j;

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

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

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

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

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

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

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

  847.                     }

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

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

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

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

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

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

  854.                         }

  855.                     }

  856.                     print=changed=1;

  857.                 }

  858.             }

  859.         }

  860.     }while(changed);

  861.     return print;

  862. }

  863. 

  864. static av_cold int encode_init(AVCodecContext *avctx)

  865. {

  866.     FFV1Context *s = avctx->priv_data;

  867.     int i, j, k, m;

  868. 

  869.     common_init(avctx);

  870. 

  871.     s->version=0;

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

  873. 

  874.     if(s->ac>1)

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

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

  877. 

  878.     s->plane_count=3;

  879.     switch(avctx->pix_fmt){

  880.     case PIX_FMT_YUV420P9:

  881.         if (!avctx->bits_per_raw_sample)

  882.             s->bits_per_raw_sample = 9;

  883.     case PIX_FMT_YUV420P10:

  884.     case PIX_FMT_YUV422P10:

  885.         s->packed_at_lsb = 1;

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

  887.             s->bits_per_raw_sample = 10;

  888.     case PIX_FMT_GRAY16:

  889.     case PIX_FMT_YUV444P16:

  890.     case PIX_FMT_YUV422P16:

  891.     case PIX_FMT_YUV420P16:

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

  893.             s->bits_per_raw_sample = 16;

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

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

  896.         }

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

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

  899.             return -1;

  900.         }

  901.         if(!s->ac){

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

  903.             return -1;

  904.         }

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

  906.     case PIX_FMT_GRAY8:

  907.     case PIX_FMT_YUV444P:

  908.     case PIX_FMT_YUV440P:

  909.     case PIX_FMT_YUV422P:

  910.     case PIX_FMT_YUV420P:

  911.     case PIX_FMT_YUV411P:

  912.     case PIX_FMT_YUV410P:

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

  914.         s->colorspace= 0;

  915.         break;

  916.     case PIX_FMT_YUVA444P:

  917.     case PIX_FMT_YUVA420P:

  918.         s->chroma_planes= 1;

  919.         s->colorspace= 0;

  920.         s->transparency= 1;

  921.         break;

  922.     case PIX_FMT_RGB32:

  923.         s->colorspace= 1;

  924.         s->transparency= 1;

  925.         break;

  926.     case PIX_FMT_0RGB32:

  927.         s->colorspace= 1;

  928.         break;

  929.     default:

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

  931.         return -1;

  932.     }

  933.     if (s->transparency) {

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

  935.     }

  936. 

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

  938.         s->quant_table_count=2;

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

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

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

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

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

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

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

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

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

  948.         }else{

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

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

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

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

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

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

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

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

  957.         }

  958.     }

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

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

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

  962. 

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

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

  965. 

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

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

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

  969.     }

  970. 

  971.     if(allocate_initial_states(s) < 0)

  972.         return AVERROR(ENOMEM);

  973. 

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

  975.     if(!s->transparency)

  976.         s->plane_count= 2;

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

  978. 

  979.     s->picture_number=0;

  980. 

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

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

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

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

  985.                 return AVERROR(ENOMEM);

  986.         }

  987.     }

  988.     if(avctx->stats_in){

  989.         char *p= avctx->stats_in;

  990.         uint8_t best_state[256][256];

  991.         int gob_count=0;

  992.         char *next;

  993. 

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

  995. 

  996.         for(;;){

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

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

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

  1000.                     if(next==p){

  1001.                         av_log(avctx, AV_LOG_ERROR, "2Pass file invalid at %d %d [%s]\n", j,i,p);

  1002.                         return -1;

  1003.                     }

  1004.                     p=next;

  1005.                 }

  1006.             }

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

  1008.                 for(j=0; j<s->context_count[i]; j++){

  1009.                     for(k=0; k<32; k++){

  1010.                         for(m=0; m<2; m++){

  1011.                             s->rc_stat2[i][j][k][m]= strtol(p, &next, 0);

  1012.                             if(next==p){

  1013.                                 av_log(avctx, AV_LOG_ERROR, "2Pass file invalid at %d %d %d %d [%s]\n", i,j,k,m,p);

  1014.                                 return -1;

  1015.                             }

  1016.                             p=next;

  1017.                         }

  1018.                     }

  1019.                 }

  1020.             }

  1021.             gob_count= strtol(p, &next, 0);

  1022.             if(next==p || gob_count <0){

  1023.                 av_log(avctx, AV_LOG_ERROR, "2Pass file invalid\n");

  1024.                 return -1;

  1025.             }

  1026.             p=next;

  1027.             while(*p=='\n' || *p==' ') p++;

  1028.             if(p[0]==0) break;

  1029.         }

  1030.         sort_stt(s, s->state_transition);

  1031. 

  1032.         find_best_state(best_state, s->state_transition);

  1033. 

  1034.         for(i=0; i<s->quant_table_count; i++){

  1035.             for(j=0; j<s->context_count[i]; j++){

  1036.                 for(k=0; k<32; k++){

  1037.                     double p= 128;

  1038.                     if(s->rc_stat2[i][j][k][0]+s->rc_stat2[i][j][k][1]){

  1039.                         p=256.0*s->rc_stat2[i][j][k][1] / (s->rc_stat2[i][j][k][0]+s->rc_stat2[i][j][k][1]);

  1040.                     }

  1041.                     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)];

  1042.                 }

  1043.             }

  1044.         }

  1045.     }

  1046. 

  1047.     if(s->version>1){

  1048.         s->num_h_slices=2;

  1049.         s->num_v_slices=2;

  1050.         write_extra_header(s);

  1051.     }

  1052. 

  1053.     if(init_slice_contexts(s) < 0)

  1054.         return -1;

  1055.     if(init_slice_state(s) < 0)

  1056.         return -1;

  1057. 

  1058. #define STATS_OUT_SIZE 1024*1024*6

  1059.     if(avctx->flags & CODEC_FLAG_PASS1){

  1060.         avctx->stats_out= av_mallocz(STATS_OUT_SIZE);

  1061.         for(i=0; i<s->quant_table_count; i++){

  1062.             for(j=0; j<s->slice_count; j++){

  1063.                 FFV1Context *sf= s->slice_context[j];

  1064.                 av_assert0(!sf->rc_stat2[i]);

  1065.                 sf->rc_stat2[i]= av_mallocz(s->context_count[i]*sizeof(*sf->rc_stat2[i]));

  1066.                 if(!sf->rc_stat2[i])

  1067.                     return AVERROR(ENOMEM);

  1068.             }

  1069.         }

  1070.     }

  1071. 

  1072.     return 0;

  1073. }

  1074. #endif /* CONFIG_FFV1_ENCODER */

  1075. 

  1076. 

  1077. static void clear_state(FFV1Context *f){

  1078.     int i, si, j;

  1079. 

  1080.     for(si=0; si<f->slice_count; si++){

  1081.         FFV1Context *fs= f->slice_context[si];

  1082.         for(i=0; i<f->plane_count; i++){

  1083.             PlaneContext *p= &fs->plane[i];

  1084. 

  1085.             p->interlace_bit_state[0]= 128;

  1086.             p->interlace_bit_state[1]= 128;

  1087. 

  1088.             if(fs->ac){

  1089.                 if(f->initial_states[p->quant_table_index]){

  1090.                     memcpy(p->state, f->initial_states[p->quant_table_index], CONTEXT_SIZE*p->context_count);

  1091.                 }else

  1092.                 memset(p->state, 128, CONTEXT_SIZE*p->context_count);

  1093.             }else{

  1094.                 for(j=0; j<p->context_count; j++){

  1095.                     p->vlc_state[j].drift= 0;

  1096.                     p->vlc_state[j].error_sum= 4; //FFMAX((RANGE + 32)/64, 2);

  1097.                     p->vlc_state[j].bias= 0;

  1098.                     p->vlc_state[j].count= 1;

  1099.                 }

  1100.             }

  1101.         }

  1102.     }

  1103. }

  1104. 

  1105. #if CONFIG_FFV1_ENCODER

  1106. static int encode_slice(AVCodecContext *c, void *arg){

  1107.     FFV1Context *fs= *(void**)arg;

  1108.     FFV1Context *f= fs->avctx->priv_data;

  1109.     int width = fs->slice_width;

  1110.     int height= fs->slice_height;

  1111.     int x= fs->slice_x;

  1112.     int y= fs->slice_y;

  1113.     AVFrame * const p= &f->picture;

  1114.     const int ps= (f->bits_per_raw_sample>8)+1;

  1115. 

  1116.     if(f->colorspace==0){

  1117.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1118.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1119.         const int cx= x>>f->chroma_h_shift;

  1120.         const int cy= y>>f->chroma_v_shift;

  1121. 

  1122.         encode_plane(fs, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0);

  1123. 

  1124.         if (f->chroma_planes){

  1125.             encode_plane(fs, p->data[1] + ps*cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

  1126.             encode_plane(fs, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);

  1127.         }

  1128.         if (fs->transparency)

  1129.             encode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], 2);

  1130.     }else{

  1131.         encode_rgb_frame(fs, (uint32_t*)(p->data[0]) + ps*x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1132.     }

  1133.     emms_c();

  1134. 

  1135.     return 0;

  1136. }

  1137. 

  1138. static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,

  1139.                         const AVFrame *pict, int *got_packet)

  1140. {

  1141.     FFV1Context *f = avctx->priv_data;

  1142.     RangeCoder * const c= &f->slice_context[0]->c;

  1143.     AVFrame * const p= &f->picture;

  1144.     int used_count= 0;

  1145.     uint8_t keystate=128;

  1146.     uint8_t *buf_p;

  1147.     int i, ret;

  1148. 

  1149.     if (!pkt->data &&

  1150.         (ret = av_new_packet(pkt, avctx->width*avctx->height*((8*2+1+1)*4)/8

  1151.                                   + FF_MIN_BUFFER_SIZE)) < 0) {

  1152.         av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");

  1153.         return ret;

  1154.     }

  1155. 

  1156.     ff_init_range_encoder(c, pkt->data, pkt->size);

  1157.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1158. 

  1159.     *p = *pict;

  1160.     p->pict_type= AV_PICTURE_TYPE_I;

  1161. 

  1162.     if(avctx->gop_size==0 || f->picture_number % avctx->gop_size == 0){

  1163.         put_rac(c, &keystate, 1);

  1164.         p->key_frame= 1;

  1165.         f->gob_count++;

  1166.         write_header(f);

  1167.         clear_state(f);

  1168.     }else{

  1169.         put_rac(c, &keystate, 0);

  1170.         p->key_frame= 0;

  1171.     }

  1172. 

  1173.     if(!f->ac){

  1174.         used_count += ff_rac_terminate(c);

  1175. //printf("pos=%d\n", used_count);

  1176.         init_put_bits(&f->slice_context[0]->pb, pkt->data + used_count, pkt->size - used_count);

  1177.     }else if (f->ac>1){

  1178.         int i;

  1179.         for(i=1; i<256; i++){

  1180.             c->one_state[i]= f->state_transition[i];

  1181.             c->zero_state[256-i]= 256-c->one_state[i];

  1182.         }

  1183.     }

  1184. 

  1185.     for(i=1; i<f->slice_count; i++){

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

  1187.         uint8_t *start = pkt->data + (pkt->size-used_count)*i/f->slice_count;

  1188.         int len = pkt->size/f->slice_count;

  1189. 

  1190.         if(fs->ac){

  1191.             ff_init_range_encoder(&fs->c, start, len);

  1192.         }else{

  1193.             init_put_bits(&fs->pb, start, len);

  1194.         }

  1195.     }

  1196.     avctx->execute(avctx, encode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1197. 

  1198.     buf_p = pkt->data;

  1199.     for(i=0; i<f->slice_count; i++){

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

  1201.         int bytes;

  1202. 

  1203.         if(fs->ac){

  1204.             uint8_t state=128;

  1205.             put_rac(&fs->c, &state, 0);

  1206.             bytes= ff_rac_terminate(&fs->c);

  1207.         }else{

  1208.             flush_put_bits(&fs->pb); //nicer padding FIXME

  1209.             bytes= used_count + (put_bits_count(&fs->pb)+7)/8;

  1210.             used_count= 0;

  1211.         }

  1212.         if(i>0){

  1213.             av_assert0(bytes < pkt->size/f->slice_count);

  1214.             memmove(buf_p, fs->ac ? fs->c.bytestream_start : fs->pb.buf, bytes);

  1215.             av_assert0(bytes < (1<<24));

  1216.             AV_WB24(buf_p+bytes, bytes);

  1217.             bytes+=3;

  1218.         }

  1219.         buf_p += bytes;

  1220.     }

  1221. 

  1222.     if((avctx->flags&CODEC_FLAG_PASS1) && (f->picture_number&31)==0){

  1223.         int j, k, m;

  1224.         char *p= avctx->stats_out;

  1225.         char *end= p + STATS_OUT_SIZE;

  1226. 

  1227.         memset(f->rc_stat, 0, sizeof(f->rc_stat));

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

  1229.             memset(f->rc_stat2[i], 0, f->context_count[i]*sizeof(*f->rc_stat2[i]));

  1230. 

  1231.         for(j=0; j<f->slice_count; j++){

  1232.             FFV1Context *fs= f->slice_context[j];

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

  1234.                 f->rc_stat[i][0] += fs->rc_stat[i][0];

  1235.                 f->rc_stat[i][1] += fs->rc_stat[i][1];

  1236.             }

  1237.             for(i=0; i<f->quant_table_count; i++){

  1238.                 for(k=0; k<f->context_count[i]; k++){

  1239.                     for(m=0; m<32; m++){

  1240.                         f->rc_stat2[i][k][m][0] += fs->rc_stat2[i][k][m][0];

  1241.                         f->rc_stat2[i][k][m][1] += fs->rc_stat2[i][k][m][1];

  1242.                     }

  1243.                 }

  1244.             }

  1245.         }

  1246. 

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

  1248.             snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat[j][0], f->rc_stat[j][1]);

  1249.             p+= strlen(p);

  1250.         }

  1251.         snprintf(p, end-p, "\n");

  1252. 

  1253.         for(i=0; i<f->quant_table_count; i++){

  1254.             for(j=0; j<f->context_count[i]; j++){

  1255.                 for(m=0; m<32; m++){

  1256.                     snprintf(p, end-p, "%"PRIu64" %"PRIu64" ", f->rc_stat2[i][j][m][0], f->rc_stat2[i][j][m][1]);

  1257.                     p+= strlen(p);

  1258.                 }

  1259.             }

  1260.         }

  1261.         snprintf(p, end-p, "%d\n", f->gob_count);

  1262.     } else if(avctx->flags&CODEC_FLAG_PASS1)

  1263.         avctx->stats_out[0] = '\0';

  1264. 

  1265.     f->picture_number++;

  1266.     pkt->size   = buf_p - pkt->data;

  1267.     pkt->flags |= AV_PKT_FLAG_KEY*p->key_frame;

  1268.     *got_packet = 1;

  1269. 

  1270.     return 0;

  1271. }

  1272. #endif /* CONFIG_FFV1_ENCODER */

  1273. 

  1274. static av_cold int common_end(AVCodecContext *avctx){

  1275.     FFV1Context *s = avctx->priv_data;

  1276.     int i, j;

  1277. 

  1278.     if (avctx->codec->decode && s->picture.data[0])

  1279.         avctx->release_buffer(avctx, &s->picture);

  1280. 

  1281.     for(j=0; j<s->slice_count; j++){

  1282.         FFV1Context *fs= s->slice_context[j];

  1283.         for(i=0; i<s->plane_count; i++){

  1284.             PlaneContext *p= &fs->plane[i];

  1285. 

  1286.             av_freep(&p->state);

  1287.             av_freep(&p->vlc_state);

  1288.         }

  1289.         av_freep(&fs->sample_buffer);

  1290.     }

  1291. 

  1292.     av_freep(&avctx->stats_out);

  1293.     for(j=0; j<s->quant_table_count; j++){

  1294.         av_freep(&s->initial_states[j]);

  1295.         for(i=0; i<s->slice_count; i++){

  1296.             FFV1Context *sf= s->slice_context[i];

  1297.             av_freep(&sf->rc_stat2[j]);

  1298.         }

  1299.         av_freep(&s->rc_stat2[j]);

  1300.     }

  1301. 

  1302.     for(i=0; i<s->slice_count; i++){

  1303.         av_freep(&s->slice_context[i]);

  1304.     }

  1305. 

  1306.     return 0;

  1307. }

  1308. 

  1309. static av_always_inline void decode_line(FFV1Context *s, int w,

  1310.                                          int16_t *sample[2],

  1311.                                          int plane_index, int bits)

  1312. {

  1313.     PlaneContext * const p= &s->plane[plane_index];

  1314.     RangeCoder * const c= &s->c;

  1315.     int x;

  1316.     int run_count=0;

  1317.     int run_mode=0;

  1318.     int run_index= s->run_index;

  1319. 

  1320.     for(x=0; x<w; x++){

  1321.         int diff, context, sign;

  1322. 

  1323.         context= get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);

  1324.         if(context < 0){

  1325.             context= -context;

  1326.             sign=1;

  1327.         }else

  1328.             sign=0;

  1329. 

  1330.         av_assert2(context < p->context_count);

  1331. 

  1332.         if(s->ac){

  1333.             diff= get_symbol_inline(c, p->state[context], 1);

  1334.         }else{

  1335.             if(context == 0 && run_mode==0) run_mode=1;

  1336. 

  1337.             if(run_mode){

  1338.                 if(run_count==0 && run_mode==1){

  1339.                     if(get_bits1(&s->gb)){

  1340.                         run_count = 1<<ff_log2_run[run_index];

  1341.                         if(x + run_count <= w) run_index++;

  1342.                     }else{

  1343.                         if(ff_log2_run[run_index]) run_count = get_bits(&s->gb, ff_log2_run[run_index]);

  1344.                         else run_count=0;

  1345.                         if(run_index) run_index--;

  1346.                         run_mode=2;

  1347.                     }

  1348.                 }

  1349.                 run_count--;

  1350.                 if(run_count < 0){

  1351.                     run_mode=0;

  1352.                     run_count=0;

  1353.                     diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1354.                     if(diff>=0) diff++;

  1355.                 }else

  1356.                     diff=0;

  1357.             }else

  1358.                 diff= get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

  1359. 

  1360. //            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));

  1361.         }

  1362. 

  1363.         if(sign) diff= -diff;

  1364. 

  1365.         sample[1][x]= (predict(sample[1] + x, sample[0] + x) + diff) & ((1<<bits)-1);

  1366.     }

  1367.     s->run_index= run_index;

  1368. }

  1369. 

  1370. static void decode_plane(FFV1Context *s, uint8_t *src, int w, int h, int stride, int plane_index){

  1371.     int x, y;

  1372.     int16_t *sample[2];

  1373.     sample[0]=s->sample_buffer    +3;

  1374.     sample[1]=s->sample_buffer+w+6+3;

  1375. 

  1376.     s->run_index=0;

  1377. 

  1378.     memset(s->sample_buffer, 0, 2*(w+6)*sizeof(*s->sample_buffer));

  1379. 

  1380.     for(y=0; y<h; y++){

  1381.         int16_t *temp = sample[0]; //FIXME try a normal buffer

  1382. 

  1383.         sample[0]= sample[1];

  1384.         sample[1]= temp;

  1385. 

  1386.         sample[1][-1]= sample[0][0  ];

  1387.         sample[0][ w]= sample[0][w-1];

  1388. 

  1389. //{START_TIMER

  1390.         if(s->avctx->bits_per_raw_sample <= 8){

  1391.             decode_line(s, w, sample, plane_index, 8);

  1392.             for(x=0; x<w; x++){

  1393.                 src[x + stride*y]= sample[1][x];

  1394.             }

  1395.         }else{

  1396.             decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

  1397.             if(s->packed_at_lsb){

  1398.                 for(x=0; x<w; x++){

  1399.                     ((uint16_t*)(src + stride*y))[x]= sample[1][x];

  1400.                 }

  1401.             }else{

  1402.                 for(x=0; x<w; x++){

  1403.                     ((uint16_t*)(src + stride*y))[x]= sample[1][x] << (16 - s->avctx->bits_per_raw_sample);

  1404.                 }

  1405.             }

  1406.         }

  1407. //STOP_TIMER("decode-line")}

  1408.     }

  1409. }

  1410. 

  1411. static void decode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h, int stride){

  1412.     int x, y, p;

  1413.     int16_t *sample[4][2];

  1414.     for(x=0; x<4; x++){

  1415.         sample[x][0] = s->sample_buffer +  x*2   *(w+6) + 3;

  1416.         sample[x][1] = s->sample_buffer + (x*2+1)*(w+6) + 3;

  1417.     }

  1418. 

  1419.     s->run_index=0;

  1420. 

  1421.     memset(s->sample_buffer, 0, 8*(w+6)*sizeof(*s->sample_buffer));

  1422. 

  1423.     for(y=0; y<h; y++){

  1424.         for(p=0; p<3 + s->transparency; p++){

  1425.             int16_t *temp = sample[p][0]; //FIXME try a normal buffer

  1426. 

  1427.             sample[p][0]= sample[p][1];

  1428.             sample[p][1]= temp;

  1429. 

  1430.             sample[p][1][-1]= sample[p][0][0  ];

  1431.             sample[p][0][ w]= sample[p][0][w-1];

  1432.             decode_line(s, w, sample[p], (p+1)/2, 9);

  1433.         }

  1434.         for(x=0; x<w; x++){

  1435.             int g= sample[0][1][x];

  1436.             int b= sample[1][1][x];

  1437.             int r= sample[2][1][x];

  1438.             int a= sample[3][1][x];

  1439. 

  1440. //            assert(g>=0 && b>=0 && r>=0);

  1441. //            assert(g<256 && b<512 && r<512);

  1442. 

  1443.             b -= 0x100;

  1444.             r -= 0x100;

  1445.             g -= (b + r)>>2;

  1446.             b += g;

  1447.             r += g;

  1448. 

  1449.             src[x + stride*y]= b + (g<<8) + (r<<16) + (a<<24);

  1450.         }

  1451.     }

  1452. }

  1453. 

  1454. static int decode_slice(AVCodecContext *c, void *arg){

  1455.     FFV1Context *fs= *(void**)arg;

  1456.     FFV1Context *f= fs->avctx->priv_data;

  1457.     int width = fs->slice_width;

  1458.     int height= fs->slice_height;

  1459.     int x= fs->slice_x;

  1460.     int y= fs->slice_y;

  1461.     const int ps= (c->bits_per_raw_sample>8)+1;

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

  1463. 

  1464.     av_assert1(width && height);

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

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

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

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

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

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

  1471. 

  1472.         if (f->chroma_planes){

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

  1474.             decode_plane(fs, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);

  1475.         }

  1476.         if (fs->transparency)

  1477.             decode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], 2);

  1478.     }else{

  1479.         decode_rgb_frame(fs, (uint32_t*)p->data[0] + ps*x + y*(p->linesize[0]/4), width, height, p->linesize[0]/4);

  1480.     }

  1481. 

  1482.     emms_c();

  1483. 

  1484.     return 0;

  1485. }

  1486. 

  1487. static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale){

  1488.     int v;

  1489.     int i=0;

  1490.     uint8_t state[CONTEXT_SIZE];

  1491. 

  1492.     memset(state, 128, sizeof(state));

  1493. 

  1494.     for(v=0; i<128 ; v++){

  1495.         int len= get_symbol(c, state, 0) + 1;

  1496. 

  1497.         if(len + i > 128) return -1;

  1498. 

  1499.         while(len--){

  1500.             quant_table[i] = scale*v;

  1501.             i++;

  1502. //printf("%2d ",v);

  1503. //if(i%16==0) printf("\n");

  1504.         }

  1505.     }

  1506. 

  1507.     for(i=1; i<128; i++){

  1508.         quant_table[256-i]= -quant_table[i];

  1509.     }

  1510.     quant_table[128]= -quant_table[127];

  1511. 

  1512.     return 2*v - 1;

  1513. }

  1514. 

  1515. static int read_quant_tables(RangeCoder *c, int16_t quant_table[MAX_CONTEXT_INPUTS][256]){

  1516.     int i;

  1517.     int context_count=1;

  1518. 

  1519.     for(i=0; i<5; i++){

  1520.         context_count*= read_quant_table(c, quant_table[i], context_count);

  1521.         if(context_count > 32768U){

  1522.             return -1;

  1523.         }

  1524.     }

  1525.     return (context_count+1)/2;

  1526. }

  1527. 

  1528. static int read_extra_header(FFV1Context *f){

  1529.     RangeCoder * const c= &f->c;

  1530.     uint8_t state[CONTEXT_SIZE];

  1531.     int i, j, k;

  1532.     uint8_t state2[32][CONTEXT_SIZE];

  1533. 

  1534.     memset(state2, 128, sizeof(state2));

  1535.     memset(state, 128, sizeof(state));

  1536. 

  1537.     ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);

  1538.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1539. 

  1540.     f->version= get_symbol(c, state, 0);

  1541.     f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1542.     if(f->ac>1){

  1543.         for(i=1; i<256; i++){

  1544.             f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1545.         }

  1546.     }

  1547.     f->colorspace= get_symbol(c, state, 0); //YUV cs type

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

  1549.     get_rac(c, state); //no chroma = false

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

  1551.     f->chroma_v_shift= get_symbol(c, state, 0);

  1552.     f->transparency= get_rac(c, state);

  1553.     f->plane_count= 2 + f->transparency;

  1554.     f->num_h_slices= 1 + get_symbol(c, state, 0);

  1555.     f->num_v_slices= 1 + get_symbol(c, state, 0);

  1556.     if(f->num_h_slices > (unsigned)f->width || f->num_v_slices > (unsigned)f->height){

  1557.         av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");

  1558.         return -1;

  1559.     }

  1560. 

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

  1562.     if(f->quant_table_count > (unsigned)MAX_QUANT_TABLES)

  1563.         return -1;

  1564.     for(i=0; i<f->quant_table_count; i++){

  1565.         if((f->context_count[i]= read_quant_tables(c, f->quant_tables[i])) < 0){

  1566.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1567.             return -1;

  1568.         }

  1569.     }

  1570. 

  1571.     if(allocate_initial_states(f) < 0)

  1572.         return AVERROR(ENOMEM);

  1573. 

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

  1575.         if(get_rac(c, state)){

  1576.             for(j=0; j<f->context_count[i]; j++){

  1577.                 for(k=0; k<CONTEXT_SIZE; k++){

  1578.                     int pred= j ? f->initial_states[i][j-1][k] : 128;

  1579.                     f->initial_states[i][j][k]= (pred+get_symbol(c, state2[k], 1))&0xFF;

  1580.                 }

  1581.             }

  1582.         }

  1583.     }

  1584. 

  1585.     return 0;

  1586. }

  1587. 

  1588. static int read_header(FFV1Context *f){

  1589.     uint8_t state[CONTEXT_SIZE];

  1590.     int i, j, context_count;

  1591.     RangeCoder * const c= &f->slice_context[0]->c;

  1592. 

  1593.     memset(state, 128, sizeof(state));

  1594. 

  1595.     if(f->version < 2){

  1596.         f->version= get_symbol(c, state, 0);

  1597.         f->ac= f->avctx->coder_type= get_symbol(c, state, 0);

  1598.         if(f->ac>1){

  1599.             for(i=1; i<256; i++){

  1600.                 f->state_transition[i]= get_symbol(c, state, 1) + c->one_state[i];

  1601.             }

  1602.         }

  1603.         f->colorspace= get_symbol(c, state, 0); //YUV cs type

  1604.         if(f->version>0)

  1605.             f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

  1606.         f->chroma_planes= get_rac(c, state);

  1607.         f->chroma_h_shift= get_symbol(c, state, 0);

  1608.         f->chroma_v_shift= get_symbol(c, state, 0);

  1609.         f->transparency= get_rac(c, state);

  1610.         f->plane_count= 2 + f->transparency;

  1611.     }

  1612. 

  1613.     if(f->colorspace==0){

  1614.         if(!f->transparency && !f->chroma_planes){

  1615.             if (f->avctx->bits_per_raw_sample<=8)

  1616.                 f->avctx->pix_fmt= PIX_FMT_GRAY8;

  1617.             else

  1618.                 f->avctx->pix_fmt= PIX_FMT_GRAY16;

  1619.         }else if(f->avctx->bits_per_raw_sample<=8 && !f->transparency){

  1620.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1621.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P; break;

  1622.             case 0x01: f->avctx->pix_fmt= PIX_FMT_YUV440P; break;

  1623.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P; break;

  1624.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P; break;

  1625.             case 0x20: f->avctx->pix_fmt= PIX_FMT_YUV411P; break;

  1626.             case 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  1627.             default:

  1628.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1629.                 return -1;

  1630.             }

  1631.         }else if(f->avctx->bits_per_raw_sample<=8 && f->transparency){

  1632.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1633.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUVA444P; break;

  1634.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUVA420P; break;

  1635.             default:

  1636.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1637.                 return -1;

  1638.             }

  1639.         }else if(f->avctx->bits_per_raw_sample==9) {

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

  1641.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1642.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  1643.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P9 ; f->packed_at_lsb=1; break;

  1644.             default:

  1645.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1646.                 return -1;

  1647.             }

  1648.         }else if(f->avctx->bits_per_raw_sample==10) {

  1649.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1650.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1651.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P10; f->packed_at_lsb=1; break;

  1652.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P10; f->packed_at_lsb=1; break;

  1653.             default:

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

  1655.                 return -1;

  1656.             }

  1657.         }else {

  1658.             switch(16*f->chroma_h_shift + f->chroma_v_shift){

  1659.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  1660.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  1661.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P16; break;

  1662.             default:

  1663.                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

  1664.                 return -1;

  1665.             }

  1666.         }

  1667.     }else if(f->colorspace==1){

  1668.         if(f->chroma_h_shift || f->chroma_v_shift){

  1669.             av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");

  1670.             return -1;

  1671.         }

  1672.         if(f->transparency) f->avctx->pix_fmt= PIX_FMT_RGB32;

  1673.         else                f->avctx->pix_fmt= PIX_FMT_0RGB32;

  1674.     }else{

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

  1676.         return -1;

  1677.     }

  1678. 

  1679. //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

  1680.     if(f->version < 2){

  1681.         context_count= read_quant_tables(c, f->quant_table);

  1682.         if(context_count < 0){

  1683.                 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1684.                 return -1;

  1685.         }

  1686.     }else{

  1687.         f->slice_count= get_symbol(c, state, 0);

  1688.         if(f->slice_count > (unsigned)MAX_SLICES)

  1689.             return -1;

  1690.     }

  1691. 

  1692.     for(j=0; j<f->slice_count; j++){

  1693.         FFV1Context *fs= f->slice_context[j];

  1694.         fs->ac= f->ac;

  1695.         fs->packed_at_lsb= f->packed_at_lsb;

  1696. 

  1697.         if(f->version >= 2){

  1698.             fs->slice_x     = get_symbol(c, state, 0)   *f->width ;

  1699.             fs->slice_y     = get_symbol(c, state, 0)   *f->height;

  1700.             fs->slice_width =(get_symbol(c, state, 0)+1)*f->width  + fs->slice_x;

  1701.             fs->slice_height=(get_symbol(c, state, 0)+1)*f->height + fs->slice_y;

  1702. 

  1703.             fs->slice_x /= f->num_h_slices;

  1704.             fs->slice_y /= f->num_v_slices;

  1705.             fs->slice_width  = fs->slice_width /f->num_h_slices - fs->slice_x;

  1706.             fs->slice_height = fs->slice_height/f->num_v_slices - fs->slice_y;

  1707.             if((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height)

  1708.                 return -1;

  1709.             if(    (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width

  1710.                 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

  1711.                 return -1;

  1712.         }

  1713. 

  1714.         for(i=0; i<f->plane_count; i++){

  1715.             PlaneContext * const p= &fs->plane[i];

  1716. 

  1717.             if(f->version >= 2){

  1718.                 int idx=get_symbol(c, state, 0);

  1719.                 if(idx > (unsigned)f->quant_table_count){

  1720.                     av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");

  1721.                     return -1;

  1722.                 }

  1723.                 p->quant_table_index= idx;

  1724.                 memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));

  1725.                 context_count= f->context_count[idx];

  1726.             }else{

  1727.                 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));

  1728.             }

  1729. 

  1730.             if(p->context_count < context_count){

  1731.                 av_freep(&p->state);

  1732.                 av_freep(&p->vlc_state);

  1733.             }

  1734.             p->context_count= context_count;

  1735.         }

  1736.     }

  1737. 

  1738.     return 0;

  1739. }

  1740. 

  1741. static av_cold int decode_init(AVCodecContext *avctx)

  1742. {

  1743.     FFV1Context *f = avctx->priv_data;

  1744. 

  1745.     common_init(avctx);

  1746. 

  1747.     if(avctx->extradata && read_extra_header(f) < 0)

  1748.         return -1;

  1749. 

  1750.     if(init_slice_contexts(f) < 0)

  1751.         return -1;

  1752. 

  1753.     return 0;

  1754. }

  1755. 

  1756. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  1757.     const uint8_t *buf = avpkt->data;

  1758.     int buf_size = avpkt->size;

  1759.     FFV1Context *f = avctx->priv_data;

  1760.     RangeCoder * const c= &f->slice_context[0]->c;

  1761.     AVFrame * const p= &f->picture;

  1762.     int bytes_read, i;

  1763.     uint8_t keystate= 128;

  1764.     const uint8_t *buf_p;

  1765. 

  1766.     AVFrame *picture = data;

  1767. 

  1768.     /* release previously stored data */

  1769.     if (p->data[0])

  1770.         avctx->release_buffer(avctx, p);

  1771. 

  1772.     ff_init_range_decoder(c, buf, buf_size);

  1773.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1774. 

  1775. 

  1776.     p->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P

  1777.     if(get_rac(c, &keystate)){

  1778.         p->key_frame= 1;

  1779.         if(read_header(f) < 0)

  1780.             return -1;

  1781.         if(init_slice_state(f) < 0)

  1782.             return -1;

  1783. 

  1784.         clear_state(f);

  1785.     }else{

  1786.         p->key_frame= 0;

  1787.     }

  1788.     if(f->ac>1){

  1789.         int i;

  1790.         for(i=1; i<256; i++){

  1791.             c->one_state[i]= f->state_transition[i];

  1792.             c->zero_state[256-i]= 256-c->one_state[i];

  1793.         }

  1794.     }

  1795. 

  1796.     p->reference= 0;

  1797.     if(avctx->get_buffer(avctx, p) < 0){

  1798.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1799.         return -1;

  1800.     }

  1801. 

  1802.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  1803.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  1804. 

  1805.     if(!f->ac){

  1806.         bytes_read = c->bytestream - c->bytestream_start - 1;

  1807.         if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME

  1808. //printf("pos=%d\n", bytes_read);

  1809.         init_get_bits(&f->slice_context[0]->gb, buf + bytes_read, (buf_size - bytes_read) * 8);

  1810.     } else {

  1811.         bytes_read = 0; /* avoid warning */

  1812.     }

  1813. 

  1814.     buf_p= buf + buf_size;

  1815.     for(i=f->slice_count-1; i>0; i--){

  1816.         FFV1Context *fs= f->slice_context[i];

  1817.         int v= AV_RB24(buf_p-3)+3;

  1818.         if(buf_p - buf <= v){

  1819.             av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");

  1820.             return -1;

  1821.         }

  1822.         buf_p -= v;

  1823.         if(fs->ac){

  1824.             ff_init_range_decoder(&fs->c, buf_p, v);

  1825.         }else{

  1826.             init_get_bits(&fs->gb, buf_p, v * 8);

  1827.         }

  1828.     }

  1829. 

  1830.     avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL, f->slice_count, sizeof(void*));

  1831.     f->picture_number++;

  1832. 

  1833.     *picture= *p;

  1834.     *data_size = sizeof(AVFrame);

  1835. 

  1836.     return buf_size;

  1837. }

  1838. 

  1839. AVCodec ff_ffv1_decoder = {

  1840.     .name           = "ffv1",

  1841.     .type           = AVMEDIA_TYPE_VIDEO,

  1842.     .id             = CODEC_ID_FFV1,

  1843.     .priv_data_size = sizeof(FFV1Context),

  1844.     .init           = decode_init,

  1845.     .close          = common_end,

  1846.     .decode         = decode_frame,

  1847.     .capabilities   = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ | CODEC_CAP_SLICE_THREADS,

  1848.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1849. };

  1850. 

  1851. #if CONFIG_FFV1_ENCODER

  1852. AVCodec ff_ffv1_encoder = {

  1853.     .name           = "ffv1",

  1854.     .type           = AVMEDIA_TYPE_VIDEO,

  1855.     .id             = CODEC_ID_FFV1,

  1856.     .priv_data_size = sizeof(FFV1Context),

  1857.     .init           = encode_init,

  1858.     .encode2        = encode_frame,

  1859.     .close          = common_end,

  1860.     .capabilities = CODEC_CAP_SLICE_THREADS,

  1861.     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUVA420P, PIX_FMT_YUV444P, PIX_FMT_YUVA444P, PIX_FMT_YUV440P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_0RGB32, PIX_FMT_RGB32, PIX_FMT_YUV420P16, PIX_FMT_YUV422P16, PIX_FMT_YUV444P16, PIX_FMT_YUV420P9, PIX_FMT_YUV420P10, PIX_FMT_YUV422P10, PIX_FMT_GRAY16, PIX_FMT_GRAY8, PIX_FMT_NONE},

  1862.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

  1863. };

  1864. #endif