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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[0]+x, sample[1]+x, sample[2]+x);

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

  433.     const int ring_size=2;

  434.     int_fast16_t sample_buffer[ring_size][w+6], *sample[ring_size];

  435.     s->run_index=0;

  436.     

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

  438.     

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

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

  441.             sample[i]= sample_buffer[(h+i-y)%ring_size]+3;

  442.         

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

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

  445. //{START_TIMER

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

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

  448.         }

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

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

  451.     }

  452. }

  453. 

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

  455.     int x, y, p, i;

  456.     const int ring_size=2;

  457.     int_fast16_t sample_buffer[3][ring_size][w+6], *sample[3][ring_size];

  458.     s->run_index=0;

  459.     

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

  461.     

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

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

  464.             for(p=0; p<3; p++)

  465.                 sample[p][i]= sample_buffer[p][(h+i-y)%ring_size]+3;

  466. 

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

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

  469.             int b= v&0xFF;

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

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

  472.             

  473.             b -= g;

  474.             r -= g;

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

  476.             b += 0x100;

  477.             r += 0x100;

  478.             

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

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

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

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

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

  484.         }

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

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

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

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

  489.         }

  490.     }

  491. }

  492. 

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

  494.     int last=0;

  495.     int i;

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

  497. 

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

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

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

  501.             last= i;

  502.         }

  503.     }

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

  505. }

  506. 

  507. static void write_header(FFV1Context *f){

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

  509.     int i;

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

  511. 

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

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

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

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

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

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

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

  519. 

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

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

  522. }

  523. 

  524. static int common_init(AVCodecContext *avctx){

  525.     FFV1Context *s = avctx->priv_data;

  526.     int width, height;

  527. 

  528.     s->avctx= avctx;

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

  530.         

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

  532.     

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

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

  535.     

  536.     assert(width && height);

  537. 

  538.     return 0;

  539. }

  540. 

  541. static int encode_init(AVCodecContext *avctx)

  542. {

  543.     FFV1Context *s = avctx->priv_data;

  544.     int i;

  545. 

  546.     common_init(avctx);

  547.  

  548.     s->version=0;

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

  550.     

  551.     s->plane_count=2;

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

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

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

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

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

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

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

  559.         }else{

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

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

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

  563.         }

  564.     }

  565. 

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

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

  568.                

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

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

  571.         }else{        

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

  573.         }

  574. 

  575.         if(s->ac){

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

  577.         }else{

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

  579.         }

  580.     }

  581. 

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

  583.     switch(avctx->pix_fmt){

  584.     case PIX_FMT_YUV444P:

  585.     case PIX_FMT_YUV422P:

  586.     case PIX_FMT_YUV420P:

  587.     case PIX_FMT_YUV411P:

  588.     case PIX_FMT_YUV410P:

  589.         s->colorspace= 0;

  590.         break;

  591.     case PIX_FMT_RGBA32:

  592.         s->colorspace= 1;

  593.         break;

  594.     default:

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

  596.         return -1;

  597.     }

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

  599. 

  600.     s->picture_number=0;

  601.     

  602.     return 0;

  603. }

  604. 

  605. 

  606. static void clear_state(FFV1Context *f){

  607.     int i, j;

  608. 

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

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

  611. 

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

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

  614.         

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

  616.             if(f->ac){

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

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

  619.             }else{

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

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

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

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

  624.             }

  625.         }

  626.     }

  627. }

  628. 

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

  630.     FFV1Context *f = avctx->priv_data;

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

  632.     AVFrame *pict = data;

  633.     const int width= f->width;

  634.     const int height= f->height;

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

  636.     int used_count= 0;

  637. 

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

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

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

  641.         return -1;

  642.     }

  643.         

  644.     ff_init_cabac_encoder(c, buf, buf_size);

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

  646.     c->lps_state[2] = 1;

  647.     c->lps_state[3] = 0;

  648.     

  649.     *p = *pict;

  650.     p->pict_type= FF_I_TYPE;

  651.     

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

  653.         put_cabac_bypass(c, 1);

  654.         p->key_frame= 1;

  655.         write_header(f);

  656.         clear_state(f);

  657.     }else{

  658.         put_cabac_bypass(c, 0);

  659.         p->key_frame= 0;

  660.     }

  661. 

  662.     if(!f->ac){

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

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

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

  666.     }

  667.     

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

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

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

  671. 

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

  673. 

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

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

  676.     }else{

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

  678.     }

  679.     emms_c();

  680.     

  681.     f->picture_number++;

  682. 

  683.     if(f->ac){

  684.         return put_cabac_terminate(c, 1);

  685.     }else{

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

  687.         return used_count + (put_bits_count(&f->pb)+7)/8;

  688.     }

  689. }

  690. 

  691. static void common_end(FFV1Context *s){

  692.     int i; 

  693. 

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

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

  696. 

  697.         av_freep(&p->state);

  698.     }

  699. }

  700. 

  701. static int encode_end(AVCodecContext *avctx)

  702. {

  703.     FFV1Context *s = avctx->priv_data;

  704. 

  705.     common_end(s);

  706. 

  707.     return 0;

  708. }

  709. 

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

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

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

  713.     int x;

  714.     int run_count=0;

  715.     int run_mode=0;

  716.     int run_index= s->run_index;

  717. 

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

  719.         int diff, context, sign;

  720.          

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

  722.         if(context < 0){

  723.             context= -context;

  724.             sign=1;

  725.         }else

  726.             sign=0;

  727.         

  728. 

  729.         if(s->ac)

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

  731.         else{

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

  733.             

  734.             if(run_mode){

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

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

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

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

  739.                     }else{

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

  741.                         else run_count=0;

  742.                         if(run_index) run_index--;

  743.                         run_mode=2;

  744.                     }

  745.                 }

  746.                 run_count--;

  747.                 if(run_count < 0){

  748.                     run_mode=0;

  749.                     run_count=0;

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

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

  752.                 }else

  753.                     diff=0;

  754.             }else

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

  756.             

  757. //            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));

  758.         }

  759. 

  760.         if(sign) diff= -diff;

  761. 

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

  763.     }

  764.     s->run_index= run_index;        

  765. }

  766. 

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

  768.     int x, y;

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

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

  771. 

  772.     s->run_index=0;

  773.     

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

  775.     

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

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

  778. 

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

  780.         sample[1]= temp;

  781. 

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

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

  784.         

  785. //{START_TIMER

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

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

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

  789.         }

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

  791.     }

  792. }

  793. 

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

  795.     int x, y, p;

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

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

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

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

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

  801. 

  802.     s->run_index=0;

  803.     

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

  805.     

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

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

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

  809. 

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

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

  812. 

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

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

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

  816.         }

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

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

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

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

  821. 

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

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

  824.             

  825.             b -= 0x100;

  826.             r -= 0x100;

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

  828.             b += g;

  829.             r += g;

  830.             

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

  832.         }

  833.     }

  834. }

  835. 

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

  837.     int v;

  838.     int i=0;

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

  840. 

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

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

  843. 

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

  845.         

  846.         while(len--){

  847.             quant_table[i] = scale*v;

  848.             i++;

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

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

  851.         }

  852.     }

  853. 

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

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

  856.     }

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

  858.     

  859.     return 2*v - 1;

  860. }

  861. 

  862. static int read_header(FFV1Context *f){

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

  864.     int i, context_count;

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

  866.     

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

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

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

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

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

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

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

  874.     f->plane_count= 2;

  875. 

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

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

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

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

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

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

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

  883.         default:

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

  885.             return -1;

  886.         }

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

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

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

  890.             return -1;

  891.         }

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

  893.     }else{

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

  895.         return -1;

  896.     }

  897. 

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

  899. 

  900.     context_count=1;

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

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

  903.         if(context_count < 0){

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

  905.             return -1;

  906.         }

  907.     }

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

  909.     

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

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

  912. 

  913.         p->context_count= context_count;

  914. 

  915.         if(f->ac){

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

  917.         }else{

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

  919.         }

  920.     }

  921.     

  922.     return 0;

  923. }

  924. 

  925. static int decode_init(AVCodecContext *avctx)

  926. {

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

  928. 

  929.     common_init(avctx);

  930.     

  931.     return 0;

  932. }

  933. 

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

  935.     FFV1Context *f = avctx->priv_data;

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

  937.     const int width= f->width;

  938.     const int height= f->height;

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

  940.     int bytes_read;

  941. 

  942.     AVFrame *picture = data;

  943. 

  944.     /* no supplementary picture */

  945.     if (buf_size == 0)

  946.         return 0;

  947. 

  948.     ff_init_cabac_decoder(c, buf, buf_size);

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

  950.     c->lps_state[2] = 1;

  951.     c->lps_state[3] = 0;

  952. 

  953. 

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

  955.     if(get_cabac_bypass(c)){

  956.         p->key_frame= 1;

  957.         read_header(f);

  958.         clear_state(f);

  959.     }else{

  960.         p->key_frame= 0;

  961.     }

  962. 

  963.     p->reference= 0;

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

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

  966.         return -1;

  967.     }

  968. 

  969.     if(avctx->debug&FF_DEBUG_PICT_INFO)

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

  971.     

  972.     if(!f->ac){

  973.         bytes_read = get_cabac_terminate(c);

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

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

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

  977.     } else {

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

  979.     }

  980.     

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

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

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

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

  985.         

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

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

  988.     }else{

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

  990.     }

  991.         

  992.     emms_c();

  993. 

  994.     f->picture_number++;

  995. 

  996.     *picture= *p;

  997.     

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

  999. 

  1000.     *data_size = sizeof(AVFrame);

  1001.     

  1002.     if(f->ac){

  1003.         bytes_read= get_cabac_terminate(c);

  1004.         if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of frame\n");

  1005.     }else{

  1006.         bytes_read+= (get_bits_count(&f->gb)+7)/8;

  1007.     }

  1008. 

  1009.     return bytes_read;

  1010. }

  1011. 

  1012. AVCodec ffv1_decoder = {

  1013.     "ffv1",

  1014.     CODEC_TYPE_VIDEO,

  1015.     CODEC_ID_FFV1,

  1016.     sizeof(FFV1Context),

  1017.     decode_init,

  1018.     NULL,

  1019.     NULL,

  1020.     decode_frame,

  1021.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1022.     NULL

  1023. };

  1024. 

  1025. #ifdef CONFIG_ENCODERS

  1026. AVCodec ffv1_encoder = {

  1027.     "ffv1",

  1028.     CODEC_TYPE_VIDEO,

  1029.     CODEC_ID_FFV1,

  1030.     sizeof(FFV1Context),

  1031.     encode_init,

  1032.     encode_frame,

  1033.     encode_end,

  1034. };

  1035. #endif