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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)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;

  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.     c->lps_state[2] = 1;

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

  655.     

  656.     *p = *pict;

  657.     p->pict_type= FF_I_TYPE;

  658.     

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

  660.         put_cabac_bypass(c, 1);

  661.         p->key_frame= 1;

  662.         write_header(f);

  663.         clear_state(f);

  664.     }else{

  665.         put_cabac_bypass(c, 0);

  666.         p->key_frame= 0;

  667.     }

  668. 

  669.     if(!f->ac){

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

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

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

  673.     }

  674.     

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

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

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

  678. 

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

  680. 

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

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

  683.     }else{

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

  685.     }

  686.     emms_c();

  687.     

  688.     f->picture_number++;

  689. 

  690.     if(f->ac){

  691.         return put_cabac_terminate(c, 1);

  692.     }else{

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

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

  695.     }

  696. }

  697. 

  698. static void common_end(FFV1Context *s){

  699.     int i; 

  700. 

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

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

  703. 

  704.         av_freep(&p->state);

  705.     }

  706. }

  707. 

  708. static int encode_end(AVCodecContext *avctx)

  709. {

  710.     FFV1Context *s = avctx->priv_data;

  711. 

  712.     common_end(s);

  713. 

  714.     return 0;

  715. }

  716. 

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

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

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

  720.     int x;

  721.     int run_count=0;

  722.     int run_mode=0;

  723.     int run_index= s->run_index;

  724. 

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

  726.         int diff, context, sign;

  727.          

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

  729.         if(context < 0){

  730.             context= -context;

  731.             sign=1;

  732.         }else

  733.             sign=0;

  734.         

  735. 

  736.         if(s->ac)

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

  738.         else{

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

  740.             

  741.             if(run_mode){

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

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

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

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

  746.                     }else{

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

  748.                         else run_count=0;

  749.                         if(run_index) run_index--;

  750.                         run_mode=2;

  751.                     }

  752.                 }

  753.                 run_count--;

  754.                 if(run_count < 0){

  755.                     run_mode=0;

  756.                     run_count=0;

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

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

  759.                 }else

  760.                     diff=0;

  761.             }else

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

  763.             

  764. //            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));

  765.         }

  766. 

  767.         if(sign) diff= -diff;

  768. 

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

  770.     }

  771.     s->run_index= run_index;        

  772. }

  773. 

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

  775.     int x, y;

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

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

  778. 

  779.     s->run_index=0;

  780.     

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

  782.     

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

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

  785. 

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

  787.         sample[1]= temp;

  788. 

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

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

  791.         

  792. //{START_TIMER

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

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

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

  796.         }

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

  798.     }

  799. }

  800. 

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

  802.     int x, y, p;

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

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

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

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

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

  808. 

  809.     s->run_index=0;

  810.     

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

  812.     

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

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

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

  816. 

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

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

  819. 

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

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

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

  823.         }

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

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

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

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

  828. 

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

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

  831.             

  832.             b -= 0x100;

  833.             r -= 0x100;

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

  835.             b += g;

  836.             r += g;

  837.             

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

  839.         }

  840.     }

  841. }

  842. 

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

  844.     int v;

  845.     int i=0;

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

  847. 

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

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

  850. 

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

  852.         

  853.         while(len--){

  854.             quant_table[i] = scale*v;

  855.             i++;

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

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

  858.         }

  859.     }

  860. 

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

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

  863.     }

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

  865.     

  866.     return 2*v - 1;

  867. }

  868. 

  869. static int read_header(FFV1Context *f){

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

  871.     int i, context_count;

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

  873.     

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

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

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

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

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

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

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

  881.     f->plane_count= 2;

  882. 

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

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

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

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

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

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

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

  890.         default:

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

  892.             return -1;

  893.         }

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

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

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

  897.             return -1;

  898.         }

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

  900.     }else{

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

  902.         return -1;

  903.     }

  904. 

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

  906. 

  907.     context_count=1;

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

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

  910.         if(context_count < 0){

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

  912.             return -1;

  913.         }

  914.     }

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

  916.     

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

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

  919. 

  920.         p->context_count= context_count;

  921. 

  922.         if(f->ac){

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

  924.         }else{

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

  926.         }

  927.     }

  928.     

  929.     return 0;

  930. }

  931. 

  932. static int decode_init(AVCodecContext *avctx)

  933. {

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

  935. 

  936.     common_init(avctx);

  937.     

  938.     return 0;

  939. }

  940. 

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

  942.     FFV1Context *f = avctx->priv_data;

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

  944.     const int width= f->width;

  945.     const int height= f->height;

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

  947.     int bytes_read;

  948. 

  949.     AVFrame *picture = data;

  950. 

  951.     *data_size = 0;

  952. 

  953.     /* no supplementary picture */

  954.     if (buf_size == 0)

  955.         return 0;

  956. 

  957.     ff_init_cabac_decoder(c, buf, buf_size);

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

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

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

  961. 

  962. 

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

  964.     if(get_cabac_bypass(c)){

  965.         p->key_frame= 1;

  966.         read_header(f);

  967.         clear_state(f);

  968.     }else{

  969.         p->key_frame= 0;

  970.     }

  971. 

  972.     p->reference= 0;

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

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

  975.         return -1;

  976.     }

  977. 

  978.     if(avctx->debug&FF_DEBUG_PICT_INFO)

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

  980.     

  981.     if(!f->ac){

  982.         bytes_read = get_cabac_terminate(c);

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

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

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

  986.     } else {

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

  988.     }

  989.     

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

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

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

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

  994.         

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

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

  997.     }else{

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

  999.     }

  1000.         

  1001.     emms_c();

  1002. 

  1003.     f->picture_number++;

  1004. 

  1005.     *picture= *p;

  1006.     

  1007.     avctx->release_buffer(avctx, p); //FIXME

  1008. 

  1009.     *data_size = sizeof(AVFrame);

  1010.     

  1011.     if(f->ac){

  1012.         bytes_read= get_cabac_terminate(c);

  1013.         if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of frame\n");

  1014.     }else{

  1015.         bytes_read+= (get_bits_count(&f->gb)+7)/8;

  1016.     }

  1017. 

  1018.     return bytes_read;

  1019. }

  1020. 

  1021. static int decode_end(AVCodecContext *avctx)

  1022. {

  1023.     FFV1Context *s = avctx->priv_data;

  1024.     int i;

  1025.     

  1026.     if(avctx->get_buffer == avcodec_default_get_buffer){

  1027.         for(i=0; i<4; i++){

  1028.             av_freep(&s->picture.base[i]);

  1029.             s->picture.data[i]= NULL;

  1030.         }

  1031.         av_freep(&s->picture.opaque);

  1032.     }

  1033. 

  1034.     return 0;

  1035. }

  1036. 

  1037. AVCodec ffv1_decoder = {

  1038.     "ffv1",

  1039.     CODEC_TYPE_VIDEO,

  1040.     CODEC_ID_FFV1,

  1041.     sizeof(FFV1Context),

  1042.     decode_init,

  1043.     NULL,

  1044.     decode_end,

  1045.     decode_frame,

  1046.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1047.     NULL

  1048. };

  1049. 

  1050. #ifdef CONFIG_ENCODERS

  1051. AVCodec ffv1_encoder = {

  1052.     "ffv1",

  1053.     CODEC_TYPE_VIDEO,

  1054.     CODEC_ID_FFV1,

  1055.     sizeof(FFV1Context),

  1056.     encode_init,

  1057.     encode_frame,

  1058.     encode_end,

  1059. };

  1060. #endif