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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 "bitstream.h"

  29. #include "avcodec.h"

  30. #include "dsputil.h"

  31. #include "rangecoder.h"

  32. #include "golomb.h"

  33. 

  34. #define MAX_PLANES 4

  35. #define CONTEXT_SIZE 32

  36. 

  37. static const int8_t quant3[256]={

  38.  0, 0, 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,-1,

  53. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0,

  54. };

  55. static const int8_t quant5[256]={

  56.  0, 1, 1, 1, 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,-2,-2,-2,

  71. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,-1,

  72. };

  73. static const int8_t quant7[256]={

  74.  0, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

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

  76.  2, 2, 2, 2, 2, 2, 2, 2, 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,-3,-3,-3,-3,-3,-3,-3,

  87. -3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,

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

  89. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,

  90. };

  91. static const int8_t quant9[256]={

  92.  0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  93.  3, 3, 3, 3, 3, 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,-4,-4,-4,-4,

  106. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,

  107. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-1,-1,

  108. };

  109. static const int8_t quant11[256]={

  110.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

  111.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  112.  4, 4, 4, 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,-5,-5,

  123. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-4,-4,

  124. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  125. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  126. };

  127. static const int8_t quant13[256]={

  128.  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  129.  4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

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

  131.  5, 5, 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,-6,

  140. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-5,

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

  142. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  143. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,

  144. };

  145. 

  146. static const uint8_t log2_run[32]={

  147.  0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 

  148.  4, 4, 5, 5, 6, 6, 7, 7, 

  149.  8, 9,10,11,12,13,14,15,

  150. };

  151. 

  152. typedef struct VlcState{

  153.     int16_t drift;

  154.     uint16_t error_sum;

  155.     int8_t bias;

  156.     uint8_t count;

  157. } VlcState;

  158. 

  159. typedef struct PlaneContext{

  160.     int context_count;

  161.     uint8_t (*state)[CONTEXT_SIZE];

  162.     VlcState *vlc_state;

  163.     uint8_t interlace_bit_state[2];

  164. } PlaneContext;

  165. 

  166. typedef struct FFV1Context{

  167.     AVCodecContext *avctx;

  168.     RangeCoder c;

  169.     GetBitContext gb;

  170.     PutBitContext pb;

  171.     int version;

  172.     int width, height;

  173.     int chroma_h_shift, chroma_v_shift;

  174.     int flags;

  175.     int picture_number;

  176.     AVFrame picture;

  177.     int plane_count;

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

  179.     PlaneContext plane[MAX_PLANES];

  180.     int16_t quant_table[5][256];

  181.     int run_index;

  182.     int colorspace;

  183.     

  184.     DSPContext dsp; 

  185. }FFV1Context;

  186. 

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

  188.     if(bits==8)

  189.         diff= (int8_t)diff;

  190.     else{

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

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

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

  194.     }

  195. 

  196.     return diff;

  197. }

  198. 

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

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

  201.     const int  T= last[ 0];

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

  203. 

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

  205. }

  206. 

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

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

  209.     const int  T= last[ 0];

  210.     const int RT= last[ 1];

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

  212. 

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

  214.         const int TT= last2[0];

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

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

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

  218.     }else

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

  220. }

  221. 

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

  223.     int i;

  224. 

  225.     if(v){

  226.         const int a= ABS(v);

  227.         const int e= av_log2(a);

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

  229.         

  230.         assert(e<=9);

  231. 

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

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

  234.         }

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

  236. 

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

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

  239.         }

  240. 

  241.         if(is_signed)

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

  243.     }else{

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

  245.     }

  246. }

  247. 

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

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

  250.         return 0;

  251.     else{

  252.         int i, e, a;

  253.         e= 0;

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

  255.             e++;

  256.         }

  257.         assert(e<=9);

  258. 

  259.         a= 1;

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

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

  262.         }

  263. 

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

  265.             return -a;

  266.         else

  267.             return a;

  268.     }

  269. }

  270. 

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

  272.     int drift= state->drift;

  273.     int count= state->count;

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

  275.     drift += v;

  276. 

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

  278.         count >>= 1;

  279.         drift >>= 1;

  280.         state->error_sum >>= 1;

  281.     }

  282.     count++;

  283. 

  284.     if(drift <= -count){

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

  286.         

  287.         drift += count;

  288.         if(drift <= -count)

  289.             drift= -count + 1;

  290.     }else if(drift > 0){

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

  292.         

  293.         drift -= count;

  294.         if(drift > 0) 

  295.             drift= 0;

  296.     }

  297. 

  298.     state->drift= drift;

  299.     state->count= count;

  300. }

  301. 

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

  303.     int i, k, code;

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

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

  306. 

  307.     i= state->count;

  308.     k=0;

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

  310.         k++;

  311.         i += i;

  312.     }

  313. 

  314.     assert(k<=8);

  315. 

  316. #if 0 // JPEG LS

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

  318.     else                                         code= v;

  319. #else

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

  321. #endif

  322.     

  323. //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);

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

  325. 

  326.     update_vlc_state(state, v);

  327. }

  328. 

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

  330.     int k, i, v, ret;

  331. 

  332.     i= state->count;

  333.     k=0;

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

  335.         k++;

  336.         i += i;

  337.     }

  338. 

  339.     assert(k<=8);

  340. 

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

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

  343. 

  344. #if 0 // JPEG LS

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

  346. #else

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

  348. #endif

  349. 

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

  351.     

  352.     update_vlc_state(state, v);

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

  354.     return ret;

  355. }

  356. 

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

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

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

  360.     int x;

  361.     int run_index= s->run_index;

  362.     int run_count=0;

  363.     int run_mode=0;

  364. 

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

  366.         int diff, context;

  367.         

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

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

  370. 

  371.         if(context < 0){

  372.             context = -context;

  373.             diff= -diff;

  374.         }

  375. 

  376.         diff= fold(diff, bits);

  377.         

  378.         if(s->ac){

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

  380.         }else{

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

  382.             

  383.             if(run_mode){

  384. 

  385.                 if(diff){

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

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

  388.                         run_index++;

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

  390.                     }

  391.                     

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

  393.                     if(run_index) run_index--;

  394.                     run_count=0;

  395.                     run_mode=0;

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

  397.                 }else{

  398.                     run_count++;

  399.                 }

  400.             }

  401.             

  402. //            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));

  403. 

  404.             if(run_mode == 0)

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

  406.         }

  407.     }

  408.     if(run_mode){

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

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

  411.             run_index++;

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

  413.         }

  414. 

  415.         if(run_count)

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

  417.     }

  418.     s->run_index= run_index;

  419. }

  420. 

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

  422.     int x,y,i;

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

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

  425.     s->run_index=0;

  426.     

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

  428.     

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

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

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

  432.         

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

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

  435. //{START_TIMER

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

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

  438.         }

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

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

  441.     }

  442. }

  443. 

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

  445.     int x, y, p, i;

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

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

  448.     s->run_index=0;

  449.     

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

  451.     

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

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

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

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

  456. 

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

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

  459.             int b= v&0xFF;

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

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

  462.             

  463.             b -= g;

  464.             r -= g;

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

  466.             b += 0x100;

  467.             r += 0x100;

  468.             

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

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

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

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

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

  474.         }

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

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

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

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

  479.         }

  480.     }

  481. }

  482. 

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

  484.     int last=0;

  485.     int i;

  486.     uint8_t state[CONTEXT_SIZE];

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

  488. 

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

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

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

  492.             last= i;

  493.         }

  494.     }

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

  496. }

  497. 

  498. static void write_header(FFV1Context *f){

  499.     uint8_t state[CONTEXT_SIZE];

  500.     int i;

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

  502. 

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

  504.     

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

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

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

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

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

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

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

  512. 

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

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

  515. }

  516. 

  517. static int common_init(AVCodecContext *avctx){

  518.     FFV1Context *s = avctx->priv_data;

  519.     int width, height;

  520. 

  521.     s->avctx= avctx;

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

  523.         

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

  525.     

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

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

  528.     

  529.     assert(width && height);

  530. 

  531.     return 0;

  532. }

  533. 

  534. static int encode_init(AVCodecContext *avctx)

  535. {

  536.     FFV1Context *s = avctx->priv_data;

  537.     int i;

  538. 

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

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

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

  542.         return -1;

  543.     }

  544.         

  545.     common_init(avctx);

  546.  

  547.     s->version=0;

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

  549.     

  550.     s->plane_count=2;

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

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

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

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

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

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

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

  558.         }else{

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

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

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

  562.         }

  563.     }

  564. 

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

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

  567.                

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

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

  570.         }else{        

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

  572.         }

  573. 

  574.         if(s->ac){

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

  576.         }else{

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

  578.         }

  579.     }

  580. 

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

  582.     switch(avctx->pix_fmt){

  583.     case PIX_FMT_YUV444P:

  584.     case PIX_FMT_YUV422P:

  585.     case PIX_FMT_YUV420P:

  586.     case PIX_FMT_YUV411P:

  587.     case PIX_FMT_YUV410P:

  588.         s->colorspace= 0;

  589.         break;

  590.     case PIX_FMT_RGBA32:

  591.         s->colorspace= 1;

  592.         break;

  593.     default:

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

  595.         return -1;

  596.     }

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

  598. 

  599.     s->picture_number=0;

  600.     

  601.     return 0;

  602. }

  603. 

  604. 

  605. static void clear_state(FFV1Context *f){

  606.     int i, j;

  607. 

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

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

  610. 

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

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

  613.         

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

  615.             if(f->ac){

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

  617.             }else{

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

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

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

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

  622.             }

  623.         }

  624.     }

  625. }

  626. 

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

  628.     FFV1Context *f = avctx->priv_data;

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

  630.     AVFrame *pict = data;

  631.     const int width= f->width;

  632.     const int height= f->height;

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

  634.     int used_count= 0;

  635.     uint8_t keystate=128;

  636. 

  637.     ff_init_range_encoder(c, buf, buf_size);

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

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

  640. 

  641.     *p = *pict;

  642.     p->pict_type= FF_I_TYPE;

  643.     

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

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

  646.         p->key_frame= 1;

  647.         write_header(f);

  648.         clear_state(f);

  649.     }else{

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

  651.         p->key_frame= 0;

  652.     }

  653. 

  654.     if(!f->ac){

  655.         used_count += ff_rac_terminate(c);

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

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

  658.     }

  659.     

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

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

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

  663. 

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

  665. 

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

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

  668.     }else{

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

  670.     }

  671.     emms_c();

  672.     

  673.     f->picture_number++;

  674. 

  675.     if(f->ac){

  676.         return ff_rac_terminate(c);

  677.     }else{

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

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

  680.     }

  681. }

  682. 

  683. static void common_end(FFV1Context *s){

  684.     int i; 

  685. 

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

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

  688. 

  689.         av_freep(&p->state);

  690.     }

  691. }

  692. 

  693. static int encode_end(AVCodecContext *avctx)

  694. {

  695.     FFV1Context *s = avctx->priv_data;

  696. 

  697.     common_end(s);

  698. 

  699.     return 0;

  700. }

  701. 

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

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

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

  705.     int x;

  706.     int run_count=0;

  707.     int run_mode=0;

  708.     int run_index= s->run_index;

  709. 

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

  711.         int diff, context, sign;

  712.          

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

  714.         if(context < 0){

  715.             context= -context;

  716.             sign=1;

  717.         }else

  718.             sign=0;

  719.         

  720. 

  721.         if(s->ac){

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

  723.         }else{

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

  725.             

  726.             if(run_mode){

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

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

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

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

  731.                     }else{

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

  733.                         else run_count=0;

  734.                         if(run_index) run_index--;

  735.                         run_mode=2;

  736.                     }

  737.                 }

  738.                 run_count--;

  739.                 if(run_count < 0){

  740.                     run_mode=0;

  741.                     run_count=0;

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

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

  744.                 }else

  745.                     diff=0;

  746.             }else

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

  748.             

  749. //            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));

  750.         }

  751. 

  752.         if(sign) diff= -diff;

  753. 

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

  755.     }

  756.     s->run_index= run_index;        

  757. }

  758. 

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

  760.     int x, y;

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

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

  763. 

  764.     s->run_index=0;

  765.     

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

  767.     

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

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

  770. 

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

  772.         sample[1]= temp;

  773. 

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

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

  776.         

  777. //{START_TIMER

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

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

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

  781.         }

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

  783.     }

  784. }

  785. 

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

  787.     int x, y, p;

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

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

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

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

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

  793. 

  794.     s->run_index=0;

  795.     

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

  797.     

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

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

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

  801. 

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

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

  804. 

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

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

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

  808.         }

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

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

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

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

  813. 

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

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

  816.             

  817.             b -= 0x100;

  818.             r -= 0x100;

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

  820.             b += g;

  821.             r += g;

  822.             

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

  824.         }

  825.     }

  826. }

  827. 

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

  829.     int v;

  830.     int i=0;

  831.     uint8_t state[CONTEXT_SIZE];

  832. 

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

  834. 

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

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

  837. 

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

  839.         

  840.         while(len--){

  841.             quant_table[i] = scale*v;

  842.             i++;

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

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

  845.         }

  846.     }

  847. 

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

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

  850.     }

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

  852.     

  853.     return 2*v - 1;

  854. }

  855. 

  856. static int read_header(FFV1Context *f){

  857.     uint8_t state[CONTEXT_SIZE];

  858.     int i, context_count;

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

  860.     

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

  862. 

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

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

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

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

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

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

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

  870.     f->plane_count= 2;

  871. 

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

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

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

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

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

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

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

  879.         default:

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

  881.             return -1;

  882.         }

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

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

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

  886.             return -1;

  887.         }

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

  889.     }else{

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

  891.         return -1;

  892.     }

  893. 

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

  895. 

  896.     context_count=1;

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

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

  899.         if(context_count < 0){

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

  901.             return -1;

  902.         }

  903.     }

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

  905.     

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

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

  908. 

  909.         p->context_count= context_count;

  910. 

  911.         if(f->ac){

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

  913.         }else{

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

  915.         }

  916.     }

  917.     

  918.     return 0;

  919. }

  920. 

  921. static int decode_init(AVCodecContext *avctx)

  922. {

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

  924. 

  925.     common_init(avctx);

  926.     

  927.     return 0;

  928. }

  929. 

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

  931.     FFV1Context *f = avctx->priv_data;

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

  933.     const int width= f->width;

  934.     const int height= f->height;

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

  936.     int bytes_read;

  937.     uint8_t keystate= 128;

  938. 

  939.     AVFrame *picture = data;

  940. 

  941.     /* no supplementary picture */

  942.     if (buf_size == 0)

  943.         return 0;

  944. 

  945.     ff_init_range_decoder(c, buf, buf_size);

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

  947. 

  948. 

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

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

  951.         p->key_frame= 1;

  952.         read_header(f);

  953.         clear_state(f);

  954.     }else{

  955.         p->key_frame= 0;

  956.     }

  957. 

  958.     p->reference= 0;

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

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

  961.         return -1;

  962.     }

  963. 

  964.     if(avctx->debug&FF_DEBUG_PICT_INFO)

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

  966.     

  967.     if(!f->ac){

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

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

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

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

  972.     } else {

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

  974.     }

  975.     

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

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

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

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

  980.         

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

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

  983.     }else{

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

  985.     }

  986.         

  987.     emms_c();

  988. 

  989.     f->picture_number++;

  990. 

  991.     *picture= *p;

  992.     

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

  994. 

  995.     *data_size = sizeof(AVFrame);

  996.     

  997.     if(f->ac){

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

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

  1000.     }else{

  1001.         bytes_read+= (get_bits_count(&f->gb)+7)/8;

  1002.     }

  1003. 

  1004.     return bytes_read;

  1005. }

  1006. 

  1007. AVCodec ffv1_decoder = {

  1008.     "ffv1",

  1009.     CODEC_TYPE_VIDEO,

  1010.     CODEC_ID_FFV1,

  1011.     sizeof(FFV1Context),

  1012.     decode_init,

  1013.     NULL,

  1014.     NULL,

  1015.     decode_frame,

  1016.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1017.     NULL

  1018. };

  1019. 

  1020. #ifdef CONFIG_ENCODERS

  1021. AVCodec ffv1_encoder = {

  1022.     "ffv1",

  1023.     CODEC_TYPE_VIDEO,

  1024.     CODEC_ID_FFV1,

  1025.     sizeof(FFV1Context),

  1026.     encode_init,

  1027.     encode_frame,

  1028.     encode_end,

  1029. };

  1030. #endif