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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 library is free software; you can redistribute it and/or

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

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

  9.  * version 2 of the License, or (at your option) any later version.

  10.  *

  11.  * This library is distributed in the hope that it will be useful,

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

  17.  * License along with this library; if not, write to the Free Software

  18.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  19.  *

  20.  */

  21.  

  22. /**

  23.  * @file ffv1.c

  24.  * FF Video Codec 1 (an experimental lossless codec)

  25.  */

  26. 

  27. #include "common.h"

  28. #include "avcodec.h"

  29. #include "dsputil.h"

  30. #include "cabac.h"

  31. #include "golomb.h"

  32. 

  33. #define MAX_PLANES 4

  34. #define CONTEXT_SIZE 32

  35. 

  36. static const int8_t quant3[256]={

  37.  0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  38.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  39.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  40.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  41.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  42.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  43.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  44.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  45. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  46. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  47. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

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

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

  52. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0,

  53. };

  54. static const int8_t quant5[256]={

  55.  0, 1, 1, 1, 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, 2,

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

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

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

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

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

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

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

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

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

  70. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,-1,

  71. };

  72. static const int8_t quant7[256]={

  73.  0, 1, 1, 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, 3, 3, 3, 3, 3, 3, 3, 3,

  76.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  77.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  78.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  79.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  80.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  81. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  82. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  83. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  84. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  85. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

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

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

  88. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,

  89. };

  90. static const int8_t quant9[256]={

  91.  0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  92.  3, 3, 3, 3, 3, 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, 4, 4, 4, 4, 4, 4, 4,

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

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

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

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

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

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

  105. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,

  106. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-1,-1,

  107. };

  108. static const int8_t quant11[256]={

  109.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

  110.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  111.  4, 4, 4, 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,-5,-5,

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

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

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

  122. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-4,-4,

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

  124. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  125. };

  126. static const int8_t quant13[256]={

  127.  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  128.  4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  129.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  130.  5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  131.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  132.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  133.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  134.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  135. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  136. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  137. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  138. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  139. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-5,

  140. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  141. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  142. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,

  143. };

  144. 

  145. static const uint8_t log2_run[32]={

  146.  0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 

  147.  4, 4, 5, 5, 6, 6, 7, 7, 

  148.  8, 9,10,11,12,13,14,15,

  149. };

  150. 

  151. typedef struct VlcState{

  152.     int16_t drift;

  153.     uint16_t error_sum;

  154.     int8_t bias;

  155.     uint8_t count;

  156. } VlcState;

  157. 

  158. typedef struct PlaneContext{

  159.     int context_count;

  160.     uint8_t (*state)[CONTEXT_SIZE];

  161.     VlcState *vlc_state;

  162.     uint8_t interlace_bit_state[2];

  163. } PlaneContext;

  164. 

  165. typedef struct FFV1Context{

  166.     AVCodecContext *avctx;

  167.     CABACContext c;

  168.     GetBitContext gb;

  169.     PutBitContext pb;

  170.     int version;

  171.     int width, height;

  172.     int chroma_h_shift, chroma_v_shift;

  173.     int flags;

  174.     int picture_number;

  175.     AVFrame picture;

  176.     int plane_count;

  177.     int ac;                              ///< 1-> CABAC 0-> golomb rice

  178.     PlaneContext plane[MAX_PLANES];

  179.     int16_t quant_table[5][256];

  180.     int run_index;

  181.     int colorspace;

  182.     

  183.     DSPContext dsp; 

  184. }FFV1Context;

  185. 

  186. static always_inline int fold(int diff, int bits){

  187.     if(bits==8)

  188.         diff= (int8_t)diff;

  189.     else{

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

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

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

  193.     }

  194. 

  195.     return diff;

  196. }

  197. 

  198. static inline int predict(int_fast16_t *src, int_fast16_t *last){

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

  200.     const int  T= last[ 0];

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

  202. 

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

  204. }

  205. 

  206. static inline int get_context(FFV1Context *f, int_fast16_t *src, int_fast16_t *last, int_fast16_t *last2){

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

  208.     const int  T= last[ 0];

  209.     const int RT= last[ 1];

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

  211. 

  212.     if(f->quant_table[3][127]){

  213.         const int TT= last2[0];

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

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

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

  217.     }else

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

  219. }

  220. 

  221. /**

  222.  * put 

  223.  */

  224. static inline void put_symbol(CABACContext *c, uint8_t *state, int v, int is_signed, int max_exp){

  225.     int i;

  226. 

  227.     if(v){

  228.         const int a= ABS(v);

  229.         const int e= av_log2(a);

  230. 

  231.         put_cabac(c, state+0, 0);

  232.         

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

  234.             put_cabac(c, state+1+i, 1);  //1..8

  235.         }

  236. 

  237.         if(e<max_exp){

  238.             put_cabac(c, state+1+i, 0);      //1..8

  239. 

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

  241.                 put_cabac(c, state+16+e+i, (a>>i)&1); //17..29

  242.             }

  243.             if(is_signed)

  244.                 put_cabac(c, state+9 + e, v < 0); //9..16

  245.         }

  246.     }else{

  247.         put_cabac(c, state+0, 1);

  248.     }

  249. }

  250. 

  251. static inline int get_symbol(CABACContext *c, uint8_t *state, int is_signed, int max_exp){

  252.     if(get_cabac(c, state+0))

  253.         return 0;

  254.     else{

  255.         int i, e;

  256.  

  257.         for(e=0; e<max_exp; e++){ 

  258.             int a= 1<<e;

  259. 

  260.             if(get_cabac(c, state + 1 + e)==0){ // 1..8

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

  262.                     a += get_cabac(c, state+16+e+i)<<i; //17..29

  263.                 }

  264. 

  265.                 if(is_signed && get_cabac(c, state+9 + e)) //9..16

  266.                     return -a;

  267.                 else

  268.                     return a;

  269.             }

  270.         }

  271.         return -(1<<e);

  272.     }

  273. }

  274. 

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

  276.     int drift= state->drift;

  277.     int count= state->count;

  278.     state->error_sum += ABS(v);

  279.     drift += v;

  280. 

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

  282.         count >>= 1;

  283.         drift >>= 1;

  284.         state->error_sum >>= 1;

  285.     }

  286.     count++;

  287. 

  288.     if(drift <= -count){

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

  290.         

  291.         drift += count;

  292.         if(drift <= -count)

  293.             drift= -count + 1;

  294.     }else if(drift > 0){

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

  296.         

  297.         drift -= count;

  298.         if(drift > 0) 

  299.             drift= 0;

  300.     }

  301. 

  302.     state->drift= drift;

  303.     state->count= count;

  304. }

  305. 

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

  307.     int i, k, code;

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

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

  310. 

  311.     i= state->count;

  312.     k=0;

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

  314.         k++;

  315.         i += i;

  316.     }

  317. 

  318.     assert(k<=8);

  319. 

  320. #if 0 // JPEG LS

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

  322.     else                                         code= v;

  323. #else

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

  325. #endif

  326.     

  327.     code = -2*code-1;

  328.     code^= (code>>31);

  329. //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);

  330.     set_ur_golomb(pb, code, k, 12, bits);

  331. 

  332.     update_vlc_state(state, v);

  333. }

  334. 

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

  336.     int k, i, v, ret;

  337. 

  338.     i= state->count;

  339.     k=0;

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

  341.         k++;

  342.         i += i;

  343.     }

  344. 

  345.     assert(k<=8);

  346. 

  347.     v= get_ur_golomb(gb, k, 12, bits);

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

  349. 

  350.     v++;

  351.     if(v&1) v=  (v>>1);

  352.     else    v= -(v>>1);

  353. 

  354. #if 0 // JPEG LS

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

  356. #else

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

  358. #endif

  359. 

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

  361.     

  362.     update_vlc_state(state, v);

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

  364.     return ret;

  365. }

  366. 

  367. static inline void encode_line(FFV1Context *s, int w, int_fast16_t *sample[2], int plane_index, int bits){

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

  369.     CABACContext * const c= &s->c;

  370.     int x;

  371.     int run_index= s->run_index;

  372.     int run_count=0;

  373.     int run_mode=0;

  374. 

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

  376.         int diff, context;

  377.         

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

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

  380. 

  381.         if(context < 0){

  382.             context = -context;

  383.             diff= -diff;

  384.         }

  385. 

  386.         diff= fold(diff, bits);

  387.         

  388.         if(s->ac){

  389.             put_symbol(c, p->state[context], diff, 1, bits-1);

  390.         }else{

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

  392.             

  393.             if(run_mode){

  394. 

  395.                 if(diff){

  396.                     while(run_count >= 1<<log2_run[run_index]){

  397.                         run_count -= 1<<log2_run[run_index];

  398.                         run_index++;

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

  400.                     }

  401.                     

  402.                     put_bits(&s->pb, 1 + log2_run[run_index], run_count);

  403.                     if(run_index) run_index--;

  404.                     run_count=0;

  405.                     run_mode=0;

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

  407.                 }else{

  408.                     run_count++;

  409.                 }

  410.             }

  411.             

  412. //            printf("count:%d index:%d, mode:%d, x:%d y:%d pos:%d\n", run_count, run_index, run_mode, x, y, (int)get_bit_count(&s->pb));

  413. 

  414.             if(run_mode == 0)

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

  416.         }

  417.     }

  418.     if(run_mode){

  419.         while(run_count >= 1<<log2_run[run_index]){

  420.             run_count -= 1<<log2_run[run_index];

  421.             run_index++;

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

  423.         }

  424. 

  425.         if(run_count)

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

  427.     }

  428.     s->run_index= run_index;

  429. }

  430. 

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

  432.     int x,y;

  433.     int_fast16_t sample_buffer[3][w+6];

  434.     int_fast16_t *sample[3]= {sample_buffer[0]+3, sample_buffer[1]+3, sample_buffer[2]+3};

  435.     s->run_index=0;

  436.     

  437.     memset(sample_buffer, 0, sizeof(sample_buffer));

  438.     

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

  440.         int_fast16_t *temp= sample[0]; //FIXME try a normal buffer

  441. 

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

  443.         sample[1]= sample[2];

  444.         sample[2]= temp;

  445.         

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

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

  448. //{START_TIMER

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

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

  451.         }

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

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

  454.     }

  455. }

  456. 

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

  458.     int x, y, p;

  459.     int_fast16_t sample_buffer[3][2][w+6];

  460.     int_fast16_t *sample[3][2]= {

  461.         {sample_buffer[0][0]+3, sample_buffer[0][1]+3},

  462.         {sample_buffer[1][0]+3, sample_buffer[1][1]+3},

  463.         {sample_buffer[2][0]+3, sample_buffer[2][1]+3}};

  464.     s->run_index=0;

  465.     

  466.     memset(sample_buffer, 0, sizeof(sample_buffer));

  467.     

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

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

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

  471.             int b= v&0xFF;

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

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

  474.             

  475.             b -= g;

  476.             r -= g;

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

  478.             b += 0x100;

  479.             r += 0x100;

  480.             

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

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

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

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

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

  486.         }

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

  488.             int_fast16_t *temp= sample[p][0]; //FIXME try a normal buffer

  489. 

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

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

  492. 

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

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

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

  496.         }

  497.     }

  498. }

  499. 

  500. static void write_quant_table(CABACContext *c, int16_t *quant_table){

  501.     int last=0;

  502.     int i;

  503.     uint8_t state[CONTEXT_SIZE]={0};

  504. 

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

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

  507.             put_symbol(c, state, i-last-1, 0, 7);

  508.             last= i;

  509.         }

  510.     }

  511.     put_symbol(c, state, i-last-1, 0, 7);

  512. }

  513. 

  514. static void write_header(FFV1Context *f){

  515.     uint8_t state[CONTEXT_SIZE]={0};

  516.     int i;

  517.     CABACContext * const c= &f->c;

  518. 

  519.     put_symbol(c, state, f->version, 0, 7);

  520.     put_symbol(c, state, f->avctx->coder_type, 0, 7);

  521.     put_symbol(c, state, f->colorspace, 0, 7); //YUV cs type 

  522.     put_cabac(c, state, 1); //chroma planes

  523.         put_symbol(c, state, f->chroma_h_shift, 0, 7);

  524.         put_symbol(c, state, f->chroma_v_shift, 0, 7);

  525.     put_cabac(c, state, 0); //no transparency plane

  526. 

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

  528.         write_quant_table(c, f->quant_table[i]);

  529. }

  530. 

  531. static int common_init(AVCodecContext *avctx){

  532.     FFV1Context *s = avctx->priv_data;

  533.     int width, height;

  534. 

  535.     s->avctx= avctx;

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

  537.         

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

  539.     

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

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

  542.     

  543.     assert(width && height);

  544. 

  545.     return 0;

  546. }

  547. 

  548. static int encode_init(AVCodecContext *avctx)

  549. {

  550.     FFV1Context *s = avctx->priv_data;

  551.     int i;

  552. 

  553.     common_init(avctx);

  554.  

  555.     s->version=0;

  556.     s->ac= avctx->coder_type;

  557.     

  558.     s->plane_count=2;

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

  560.         s->quant_table[0][i]=           quant11[i];

  561.         s->quant_table[1][i]=        11*quant11[i];

  562.         if(avctx->context_model==0){

  563.             s->quant_table[2][i]=     11*11*quant11[i];

  564.             s->quant_table[3][i]=

  565.             s->quant_table[4][i]=0;

  566.         }else{

  567.             s->quant_table[2][i]=     11*11*quant5 [i];

  568.             s->quant_table[3][i]=   5*11*11*quant5 [i];

  569.             s->quant_table[4][i]= 5*5*11*11*quant5 [i];

  570.         }

  571.     }

  572. 

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

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

  575.                

  576.         if(avctx->context_model==0){

  577.             p->context_count= (11*11*11+1)/2;

  578.         }else{        

  579.             p->context_count= (11*11*5*5*5+1)/2;

  580.         }

  581. 

  582.         if(s->ac){

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

  584.         }else{

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

  586.         }

  587.     }

  588. 

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

  590.     switch(avctx->pix_fmt){

  591.     case PIX_FMT_YUV444P:

  592.     case PIX_FMT_YUV422P:

  593.     case PIX_FMT_YUV420P:

  594.     case PIX_FMT_YUV411P:

  595.     case PIX_FMT_YUV410P:

  596.         s->colorspace= 0;

  597.         break;

  598.     case PIX_FMT_RGBA32:

  599.         s->colorspace= 1;

  600.         break;

  601.     default:

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

  603.         return -1;

  604.     }

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

  606. 

  607.     s->picture_number=0;

  608.     

  609.     return 0;

  610. }

  611. 

  612. 

  613. static void clear_state(FFV1Context *f){

  614.     int i, j;

  615. 

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

  617.         PlaneContext *p= &f->plane[i];

  618. 

  619.         p->interlace_bit_state[0]= 0;

  620.         p->interlace_bit_state[1]= 0;

  621.         

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

  623.             if(f->ac){

  624.                 memset(p->state[j], 0, sizeof(uint8_t)*CONTEXT_SIZE);

  625.                 p->state[j][7] = 2*62;

  626.             }else{

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

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

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

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

  631.             }

  632.         }

  633.     }

  634. }

  635. 

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

  637.     FFV1Context *f = avctx->priv_data;

  638.     CABACContext * const c= &f->c;

  639.     AVFrame *pict = data;

  640.     const int width= f->width;

  641.     const int height= f->height;

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

  643.     int used_count= 0;

  644. 

  645.     if(avctx->strict_std_compliance >= 0){

  646.         av_log(avctx, AV_LOG_ERROR, "this codec is under development, files encoded with it wont be decodeable with future versions!!!\n"

  647.                "use vstrict=-1 to use it anyway\n");

  648.         return -1;

  649.     }

  650.         

  651.     ff_init_cabac_encoder(c, buf, buf_size);

  652.     ff_init_cabac_states(c, ff_h264_lps_range, ff_h264_mps_state, ff_h264_lps_state, 64);

  653.     

  654.     *p = *pict;

  655.     p->pict_type= FF_I_TYPE;

  656.     

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

  658.         put_cabac_bypass(c, 1);

  659.         p->key_frame= 1;

  660.         write_header(f);

  661.         clear_state(f);

  662.     }else{

  663.         put_cabac_bypass(c, 0);

  664.         p->key_frame= 0;

  665.     }

  666. 

  667.     if(!f->ac){

  668.         used_count += put_cabac_terminate(c, 1);

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

  670.         init_put_bits(&f->pb, buf + used_count, buf_size - used_count);

  671.     }

  672.     

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

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

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

  676. 

  677.         encode_plane(f, p->data[0], width, height, p->linesize[0], 0);

  678. 

  679.         encode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);

  680.         encode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);

  681.     }else{

  682.         encode_rgb_frame(f, (uint32_t*)(p->data[0]), width, height, p->linesize[0]/4);

  683.     }

  684.     emms_c();

  685.     

  686.     f->picture_number++;

  687. 

  688.     if(f->ac){

  689.         return put_cabac_terminate(c, 1);

  690.     }else{

  691.         flush_put_bits(&f->pb); //nicer padding FIXME

  692.         return used_count + (get_bit_count(&f->pb)+7)/8;

  693.     }

  694. }

  695. 

  696. static void common_end(FFV1Context *s){

  697.     int i; 

  698. 

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

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

  701. 

  702.         av_freep(&p->state);

  703.     }

  704. }

  705. 

  706. static int encode_end(AVCodecContext *avctx)

  707. {

  708.     FFV1Context *s = avctx->priv_data;

  709. 

  710.     common_end(s);

  711. 

  712.     return 0;

  713. }

  714. 

  715. static inline void decode_line(FFV1Context *s, int w, int_fast16_t *sample[2], int plane_index, int bits){

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

  717.     CABACContext * const c= &s->c;

  718.     int x;

  719.     int run_count=0;

  720.     int run_mode=0;

  721.     int run_index= s->run_index;

  722. 

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

  724.         int diff, context, sign;

  725.          

  726.         context= get_context(s, sample[1] + x, sample[0] + x, sample[1] + x);

  727.         if(context < 0){

  728.             context= -context;

  729.             sign=1;

  730.         }else

  731.             sign=0;

  732.         

  733. 

  734.         if(s->ac)

  735.             diff= get_symbol(c, p->state[context], 1, bits-1);

  736.         else{

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

  738.             

  739.             if(run_mode){

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

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

  742.                         run_count = 1<<log2_run[run_index];

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

  744.                     }else{

  745.                         if(log2_run[run_index]) run_count = get_bits(&s->gb, log2_run[run_index]);

  746.                         else run_count=0;

  747.                         if(run_index) run_index--;

  748.                         run_mode=2;

  749.                     }

  750.                 }

  751.                 run_count--;

  752.                 if(run_count < 0){

  753.                     run_mode=0;

  754.                     run_count=0;

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

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

  757.                 }else

  758.                     diff=0;

  759.             }else

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

  761.             

  762. //            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));

  763.         }

  764. 

  765.         if(sign) diff= -diff;

  766. 

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

  768.     }

  769.     s->run_index= run_index;        

  770. }

  771. 

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

  773.     int x, y;

  774.     int_fast16_t sample_buffer[2][w+6];

  775.     int_fast16_t *sample[2]= {sample_buffer[0]+3, sample_buffer[1]+3};

  776. 

  777.     s->run_index=0;

  778.     

  779.     memset(sample_buffer, 0, sizeof(sample_buffer));

  780.     

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

  782.         int_fast16_t *temp= sample[0]; //FIXME try a normal buffer

  783. 

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

  785.         sample[1]= temp;

  786. 

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

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

  789.         

  790. //{START_TIMER

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

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

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

  794.         }

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

  796.     }

  797. }

  798. 

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

  800.     int x, y, p;

  801.     int_fast16_t sample_buffer[3][2][w+6];

  802.     int_fast16_t *sample[3][2]= {

  803.         {sample_buffer[0][0]+3, sample_buffer[0][1]+3},

  804.         {sample_buffer[1][0]+3, sample_buffer[1][1]+3},

  805.         {sample_buffer[2][0]+3, sample_buffer[2][1]+3}};

  806. 

  807.     s->run_index=0;

  808.     

  809.     memset(sample_buffer, 0, sizeof(sample_buffer));

  810.     

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

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

  813.             int_fast16_t *temp= sample[p][0]; //FIXME try a normal buffer

  814. 

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

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

  817. 

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

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

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

  821.         }

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

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

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

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

  826. 

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

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

  829.             

  830.             b -= 0x100;

  831.             r -= 0x100;

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

  833.             b += g;

  834.             r += g;

  835.             

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

  837.         }

  838.     }

  839. }

  840. 

  841. static int read_quant_table(CABACContext *c, int16_t *quant_table, int scale){

  842.     int v;

  843.     int i=0;

  844.     uint8_t state[CONTEXT_SIZE]={0};

  845. 

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

  847.         int len= get_symbol(c, state, 0, 7) + 1;

  848. 

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

  850.         

  851.         while(len--){

  852.             quant_table[i] = scale*v;

  853.             i++;

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

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

  856.         }

  857.     }

  858. 

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

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

  861.     }

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

  863.     

  864.     return 2*v - 1;

  865. }

  866. 

  867. static int read_header(FFV1Context *f){

  868.     uint8_t state[CONTEXT_SIZE]={0};

  869.     int i, context_count;

  870.     CABACContext * const c= &f->c;

  871.     

  872.     f->version= get_symbol(c, state, 0, 7);

  873.     f->ac= f->avctx->coder_type= get_symbol(c, state, 0, 7);

  874.     f->colorspace= get_symbol(c, state, 0, 7); //YUV cs type

  875.     get_cabac(c, state); //no chroma = false

  876.     f->chroma_h_shift= get_symbol(c, state, 0, 7);

  877.     f->chroma_v_shift= get_symbol(c, state, 0, 7);

  878.     get_cabac(c, state); //transparency plane

  879.     f->plane_count= 2;

  880. 

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

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

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

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

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

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

  887.         case 0x33: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  888.         default:

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

  890.             return -1;

  891.         }

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

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

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

  895.             return -1;

  896.         }

  897.         f->avctx->pix_fmt= PIX_FMT_RGBA32;

  898.     }else{

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

  900.         return -1;

  901.     }

  902. 

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

  904. 

  905.     context_count=1;

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

  907.         context_count*= read_quant_table(c, f->quant_table[i], context_count);

  908.         if(context_count < 0){

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

  910.             return -1;

  911.         }

  912.     }

  913.     context_count= (context_count+1)/2;

  914.     

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

  916.         PlaneContext * const p= &f->plane[i];

  917. 

  918.         p->context_count= context_count;

  919. 

  920.         if(f->ac){

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

  922.         }else{

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

  924.         }

  925.     }

  926.     

  927.     return 0;

  928. }

  929. 

  930. static int decode_init(AVCodecContext *avctx)

  931. {

  932. //    FFV1Context *s = avctx->priv_data;

  933. 

  934.     common_init(avctx);

  935.     

  936.     return 0;

  937. }

  938. 

  939. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size){

  940.     FFV1Context *f = avctx->priv_data;

  941.     CABACContext * const c= &f->c;

  942.     const int width= f->width;

  943.     const int height= f->height;

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

  945.     int bytes_read;

  946. 

  947.     AVFrame *picture = data;

  948. 

  949.     *data_size = 0;

  950. 

  951.     /* no supplementary picture */

  952.     if (buf_size == 0)

  953.         return 0;

  954. 

  955.     ff_init_cabac_decoder(c, buf, buf_size);

  956.     ff_init_cabac_states(c, ff_h264_lps_range, ff_h264_mps_state, ff_h264_lps_state, 64);

  957. 

  958.     p->pict_type= FF_I_TYPE; //FIXME I vs. P

  959.     if(get_cabac_bypass(c)){

  960.         p->key_frame= 1;

  961.         read_header(f);

  962.         clear_state(f);

  963.     }else{

  964.         p->key_frame= 0;

  965.     }

  966. 

  967.     p->reference= 0;

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

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

  970.         return -1;

  971.     }

  972. 

  973.     if(avctx->debug&FF_DEBUG_PICT_INFO)

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

  975.     

  976.     if(!f->ac){

  977.         bytes_read = get_cabac_terminate(c);

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

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

  980.         init_get_bits(&f->gb, buf + bytes_read, buf_size - bytes_read);

  981.     } else {

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

  983.     }

  984.     

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

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

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

  988.         decode_plane(f, p->data[0], width, height, p->linesize[0], 0);

  989.         

  990.         decode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);

  991.         decode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);

  992.     }else{

  993.         decode_rgb_frame(f, (uint32_t*)p->data[0], width, height, p->linesize[0]/4);

  994.     }

  995.         

  996.     emms_c();

  997. 

  998.     f->picture_number++;

  999. 

  1000.     *picture= *p;

  1001.     

  1002.     avctx->release_buffer(avctx, p); //FIXME

  1003. 

  1004.     *data_size = sizeof(AVFrame);

  1005.     

  1006.     if(f->ac){

  1007.         bytes_read= get_cabac_terminate(c);

  1008.         if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of frame\n");

  1009.     }else{

  1010.         bytes_read+= (get_bits_count(&f->gb)+7)/8;

  1011.     }

  1012. 

  1013.     return bytes_read;

  1014. }

  1015. 

  1016. static int decode_end(AVCodecContext *avctx)

  1017. {

  1018.     FFV1Context *s = avctx->priv_data;

  1019.     int i;

  1020.     

  1021.     if(avctx->get_buffer == avcodec_default_get_buffer){

  1022.         for(i=0; i<4; i++){

  1023.             av_freep(&s->picture.base[i]);

  1024.             s->picture.data[i]= NULL;

  1025.         }

  1026.         av_freep(&s->picture.opaque);

  1027.     }

  1028. 

  1029.     return 0;

  1030. }

  1031. 

  1032. AVCodec ffv1_decoder = {

  1033.     "ffv1",

  1034.     CODEC_TYPE_VIDEO,

  1035.     CODEC_ID_FFV1,

  1036.     sizeof(FFV1Context),

  1037.     decode_init,

  1038.     NULL,

  1039.     decode_end,

  1040.     decode_frame,

  1041.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1042.     NULL

  1043. };

  1044. 

  1045. #ifdef CONFIG_ENCODERS

  1046. AVCodec ffv1_encoder = {

  1047.     "ffv1",

  1048.     CODEC_TYPE_VIDEO,

  1049.     CODEC_ID_FFV1,

  1050.     sizeof(FFV1Context),

  1051.     encode_init,

  1052.     encode_frame,

  1053.     encode_end,

  1054. };

  1055. #endif