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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 "rangecoder.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.     RangeCoder 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. static inline void put_symbol(RangeCoder *c, uint8_t *state, int v, int is_signed){

  222.     int i;

  223. 

  224.     if(v){

  225.         const int a= ABS(v);

  226.         const int e= av_log2(a);

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

  228.         

  229.         assert(e<=9);

  230. 

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

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

  233.         }

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

  235. 

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

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

  238.         }

  239. 

  240.         if(is_signed)

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

  242.     }else{

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

  244.     }

  245. }

  246. 

  247. static inline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed){

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

  249.         return 0;

  250.     else{

  251.         int i, e, a;

  252.         e= 0;

  253.         while(get_rac(c, state+1 + e)){ //1..10

  254.             e++;

  255.         }

  256.         assert(e<=9);

  257. 

  258.         a= 1;

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

  260.             a += a + get_rac(c, state+22 + i); //22..31

  261.         }

  262. 

  263.         if(is_signed && get_rac(c, state+11 + e)) //11..21

  264.             return -a;

  265.         else

  266.             return a;

  267.     }

  268. }

  269. 

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

  271.     int drift= state->drift;

  272.     int count= state->count;

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

  274.     drift += v;

  275. 

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

  277.         count >>= 1;

  278.         drift >>= 1;

  279.         state->error_sum >>= 1;

  280.     }

  281.     count++;

  282. 

  283.     if(drift <= -count){

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

  285.         

  286.         drift += count;

  287.         if(drift <= -count)

  288.             drift= -count + 1;

  289.     }else if(drift > 0){

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

  291.         

  292.         drift -= count;

  293.         if(drift > 0) 

  294.             drift= 0;

  295.     }

  296. 

  297.     state->drift= drift;

  298.     state->count= count;

  299. }

  300. 

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

  302.     int i, k, code;

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

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

  305. 

  306.     i= state->count;

  307.     k=0;

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

  309.         k++;

  310.         i += i;

  311.     }

  312. 

  313.     assert(k<=8);

  314. 

  315. #if 0 // JPEG LS

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

  317.     else                                         code= v;

  318. #else

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

  320. #endif

  321.     

  322. //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);

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

  324. 

  325.     update_vlc_state(state, v);

  326. }

  327. 

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

  329.     int k, i, v, ret;

  330. 

  331.     i= state->count;

  332.     k=0;

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

  334.         k++;

  335.         i += i;

  336.     }

  337. 

  338.     assert(k<=8);

  339. 

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

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

  342. 

  343. #if 0 // JPEG LS

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

  345. #else

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

  347. #endif

  348. 

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

  350.     

  351.     update_vlc_state(state, v);

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

  353.     return ret;

  354. }

  355. 

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

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

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

  359.     int x;

  360.     int run_index= s->run_index;

  361.     int run_count=0;

  362.     int run_mode=0;

  363. 

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

  365.         int diff, context;

  366.         

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

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

  369. 

  370.         if(context < 0){

  371.             context = -context;

  372.             diff= -diff;

  373.         }

  374. 

  375.         diff= fold(diff, bits);

  376.         

  377.         if(s->ac){

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

  379.         }else{

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

  381.             

  382.             if(run_mode){

  383. 

  384.                 if(diff){

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

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

  387.                         run_index++;

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

  389.                     }

  390.                     

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

  392.                     if(run_index) run_index--;

  393.                     run_count=0;

  394.                     run_mode=0;

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

  396.                 }else{

  397.                     run_count++;

  398.                 }

  399.             }

  400.             

  401. //            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));

  402. 

  403.             if(run_mode == 0)

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

  405.         }

  406.     }

  407.     if(run_mode){

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

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

  410.             run_index++;

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

  412.         }

  413. 

  414.         if(run_count)

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

  416.     }

  417.     s->run_index= run_index;

  418. }

  419. 

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

  421.     int x,y,i;

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

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

  424.     s->run_index=0;

  425.     

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

  427.     

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

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

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

  431.         

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

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

  434. //{START_TIMER

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

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

  437.         }

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

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

  440.     }

  441. }

  442. 

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

  444.     int x, y, p, i;

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

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

  447.     s->run_index=0;

  448.     

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

  450.     

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

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

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

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

  455. 

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

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

  458.             int b= v&0xFF;

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

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

  461.             

  462.             b -= g;

  463.             r -= g;

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

  465.             b += 0x100;

  466.             r += 0x100;

  467.             

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

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

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

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

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

  473.         }

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

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

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

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

  478.         }

  479.     }

  480. }

  481. 

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

  483.     int last=0;

  484.     int i;

  485.     uint8_t state[CONTEXT_SIZE];

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

  487. 

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

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

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

  491.             last= i;

  492.         }

  493.     }

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

  495. }

  496. 

  497. static void write_header(FFV1Context *f){

  498.     uint8_t state[CONTEXT_SIZE];

  499.     int i;

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

  501. 

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

  503.     

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

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

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

  507.     put_rac(c, state, 1); //chroma planes

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

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

  510.     put_rac(c, state, 0); //no transparency plane

  511. 

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

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

  514. }

  515. 

  516. static int common_init(AVCodecContext *avctx){

  517.     FFV1Context *s = avctx->priv_data;

  518.     int width, height;

  519. 

  520.     s->avctx= avctx;

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

  522.         

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

  524.     

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

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

  527.     

  528.     assert(width && height);

  529. 

  530.     return 0;

  531. }

  532. 

  533. static int encode_init(AVCodecContext *avctx)

  534. {

  535.     FFV1Context *s = avctx->priv_data;

  536.     int i;

  537. 

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

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

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

  541.         return -1;

  542.     }

  543.         

  544.     common_init(avctx);

  545.  

  546.     s->version=0;

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

  548.     

  549.     s->plane_count=2;

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

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

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

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

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

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

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

  557.         }else{

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

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

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

  561.         }

  562.     }

  563. 

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

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

  566.                

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

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

  569.         }else{        

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

  571.         }

  572. 

  573.         if(s->ac){

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

  575.         }else{

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

  577.         }

  578.     }

  579. 

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

  581.     switch(avctx->pix_fmt){

  582.     case PIX_FMT_YUV444P:

  583.     case PIX_FMT_YUV422P:

  584.     case PIX_FMT_YUV420P:

  585.     case PIX_FMT_YUV411P:

  586.     case PIX_FMT_YUV410P:

  587.         s->colorspace= 0;

  588.         break;

  589.     case PIX_FMT_RGBA32:

  590.         s->colorspace= 1;

  591.         break;

  592.     default:

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

  594.         return -1;

  595.     }

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

  597. 

  598.     s->picture_number=0;

  599.     

  600.     return 0;

  601. }

  602. 

  603. 

  604. static void clear_state(FFV1Context *f){

  605.     int i, j;

  606. 

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

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

  609. 

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

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

  612.         

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

  614.             if(f->ac){

  615.                 memset(p->state[j], 128, sizeof(uint8_t)*CONTEXT_SIZE);

  616.             }else{

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

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

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

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

  621.             }

  622.         }

  623.     }

  624. }

  625. 

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

  627.     FFV1Context *f = avctx->priv_data;

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

  629.     AVFrame *pict = data;

  630.     const int width= f->width;

  631.     const int height= f->height;

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

  633.     int used_count= 0;

  634.     uint8_t keystate=128;

  635. 

  636.     ff_init_range_encoder(c, buf, buf_size);

  637. //    ff_init_cabac_states(c, ff_h264_lps_range, ff_h264_mps_state, ff_h264_lps_state, 64);

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

  639. 

  640.     *p = *pict;

  641.     p->pict_type= FF_I_TYPE;

  642.     

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

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

  645.         p->key_frame= 1;

  646.         write_header(f);

  647.         clear_state(f);

  648.     }else{

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

  650.         p->key_frame= 0;

  651.     }

  652. 

  653.     if(!f->ac){

  654.         used_count += ff_rac_terminate(c);

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

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

  657.     }

  658.     

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

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

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

  662. 

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

  664. 

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

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

  667.     }else{

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

  669.     }

  670.     emms_c();

  671.     

  672.     f->picture_number++;

  673. 

  674.     if(f->ac){

  675.         return ff_rac_terminate(c);

  676.     }else{

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

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

  679.     }

  680. }

  681. 

  682. static void common_end(FFV1Context *s){

  683.     int i; 

  684. 

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

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

  687. 

  688.         av_freep(&p->state);

  689.     }

  690. }

  691. 

  692. static int encode_end(AVCodecContext *avctx)

  693. {

  694.     FFV1Context *s = avctx->priv_data;

  695. 

  696.     common_end(s);

  697. 

  698.     return 0;

  699. }

  700. 

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

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

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

  704.     int x;

  705.     int run_count=0;

  706.     int run_mode=0;

  707.     int run_index= s->run_index;

  708. 

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

  710.         int diff, context, sign;

  711.          

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

  713.         if(context < 0){

  714.             context= -context;

  715.             sign=1;

  716.         }else

  717.             sign=0;

  718.         

  719. 

  720.         if(s->ac){

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

  722.         }else{

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

  724.             

  725.             if(run_mode){

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

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

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

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

  730.                     }else{

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

  732.                         else run_count=0;

  733.                         if(run_index) run_index--;

  734.                         run_mode=2;

  735.                     }

  736.                 }

  737.                 run_count--;

  738.                 if(run_count < 0){

  739.                     run_mode=0;

  740.                     run_count=0;

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

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

  743.                 }else

  744.                     diff=0;

  745.             }else

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

  747.             

  748. //            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));

  749.         }

  750. 

  751.         if(sign) diff= -diff;

  752. 

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

  754.     }

  755.     s->run_index= run_index;        

  756. }

  757. 

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

  759.     int x, y;

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

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

  762. 

  763.     s->run_index=0;

  764.     

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

  766.     

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

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

  769. 

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

  771.         sample[1]= temp;

  772. 

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

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

  775.         

  776. //{START_TIMER

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

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

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

  780.         }

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

  782.     }

  783. }

  784. 

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

  786.     int x, y, p;

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

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

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

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

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

  792. 

  793.     s->run_index=0;

  794.     

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

  796.     

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

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

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

  800. 

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

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

  803. 

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

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

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

  807.         }

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

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

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

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

  812. 

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

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

  815.             

  816.             b -= 0x100;

  817.             r -= 0x100;

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

  819.             b += g;

  820.             r += g;

  821.             

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

  823.         }

  824.     }

  825. }

  826. 

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

  828.     int v;

  829.     int i=0;

  830.     uint8_t state[CONTEXT_SIZE];

  831. 

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

  833. 

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

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

  836. 

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

  838.         

  839.         while(len--){

  840.             quant_table[i] = scale*v;

  841.             i++;

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

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

  844.         }

  845.     }

  846. 

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

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

  849.     }

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

  851.     

  852.     return 2*v - 1;

  853. }

  854. 

  855. static int read_header(FFV1Context *f){

  856.     uint8_t state[CONTEXT_SIZE];

  857.     int i, context_count;

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

  859.     

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

  861. 

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

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

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

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

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

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

  868.     get_rac(c, state); //transparency plane

  869.     f->plane_count= 2;

  870. 

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

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

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

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

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

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

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

  878.         default:

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

  880.             return -1;

  881.         }

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

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

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

  885.             return -1;

  886.         }

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

  888.     }else{

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

  890.         return -1;

  891.     }

  892. 

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

  894. 

  895.     context_count=1;

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

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

  898.         if(context_count < 0){

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

  900.             return -1;

  901.         }

  902.     }

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

  904.     

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

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

  907. 

  908.         p->context_count= context_count;

  909. 

  910.         if(f->ac){

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

  912.         }else{

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

  914.         }

  915.     }

  916.     

  917.     return 0;

  918. }

  919. 

  920. static int decode_init(AVCodecContext *avctx)

  921. {

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

  923. 

  924.     common_init(avctx);

  925.     

  926.     return 0;

  927. }

  928. 

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

  930.     FFV1Context *f = avctx->priv_data;

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

  932.     const int width= f->width;

  933.     const int height= f->height;

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

  935.     int bytes_read;

  936.     uint8_t keystate= 128;

  937. 

  938.     AVFrame *picture = data;

  939. 

  940.     /* no supplementary picture */

  941.     if (buf_size == 0)

  942.         return 0;

  943. 

  944.     ff_init_range_decoder(c, buf, buf_size);

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

  946. 

  947. 

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

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

  950.         p->key_frame= 1;

  951.         read_header(f);

  952.         clear_state(f);

  953.     }else{

  954.         p->key_frame= 0;

  955.     }

  956. 

  957.     p->reference= 0;

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

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

  960.         return -1;

  961.     }

  962. 

  963.     if(avctx->debug&FF_DEBUG_PICT_INFO)

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

  965.     

  966.     if(!f->ac){

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

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

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

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

  971.     } else {

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

  973.     }

  974.     

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

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

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

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

  979.         

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

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

  982.     }else{

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

  984.     }

  985.         

  986.     emms_c();

  987. 

  988.     f->picture_number++;

  989. 

  990.     *picture= *p;

  991.     

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

  993. 

  994.     *data_size = sizeof(AVFrame);

  995.     

  996.     if(f->ac){

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

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

  999.     }else{

  1000.         bytes_read+= (get_bits_count(&f->gb)+7)/8;

  1001.     }

  1002. 

  1003.     return bytes_read;

  1004. }

  1005. 

  1006. AVCodec ffv1_decoder = {

  1007.     "ffv1",

  1008.     CODEC_TYPE_VIDEO,

  1009.     CODEC_ID_FFV1,

  1010.     sizeof(FFV1Context),

  1011.     decode_init,

  1012.     NULL,

  1013.     NULL,

  1014.     decode_frame,

  1015.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1016.     NULL

  1017. };

  1018. 

  1019. #ifdef CONFIG_ENCODERS

  1020. AVCodec ffv1_encoder = {

  1021.     "ffv1",

  1022.     CODEC_TYPE_VIDEO,

  1023.     CODEC_ID_FFV1,

  1024.     sizeof(FFV1Context),

  1025.     encode_init,

  1026.     encode_frame,

  1027.     encode_end,

  1028. };

  1029. #endif