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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. /**

  222.  * put 

  223.  */

  224. static inline void put_symbol(RangeCoder *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_rac(c, state+0, 0);

  232.         

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

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

  235.         }

  236. 

  237.         if(e<max_exp){

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

  239. 

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

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

  242.             }

  243.             if(is_signed)

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

  245.         }

  246.     }else{

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

  248.     }

  249. }

  250. 

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

  252.     if(get_rac(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_rac(c, state + 1 + e)==0){ // 1..8

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

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

  263.                 }

  264. 

  265.                 if(is_signed && get_rac(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. //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);

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

  329. 

  330.     update_vlc_state(state, v);

  331. }

  332. 

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

  334.     int k, i, v, ret;

  335. 

  336.     i= state->count;

  337.     k=0;

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

  339.         k++;

  340.         i += i;

  341.     }

  342. 

  343.     assert(k<=8);

  344. 

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

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

  347. 

  348. #if 0 // JPEG LS

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

  350. #else

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

  352. #endif

  353. 

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

  355.     

  356.     update_vlc_state(state, v);

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

  358.     return ret;

  359. }

  360. 

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

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

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

  364.     int x;

  365.     int run_index= s->run_index;

  366.     int run_count=0;

  367.     int run_mode=0;

  368. 

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

  370.         int diff, context;

  371.         

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

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

  374. 

  375.         if(context < 0){

  376.             context = -context;

  377.             diff= -diff;

  378.         }

  379. 

  380.         diff= fold(diff, bits);

  381.         

  382.         if(s->ac){

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

  384.         }else{

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

  386.             

  387.             if(run_mode){

  388. 

  389.                 if(diff){

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

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

  392.                         run_index++;

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

  394.                     }

  395.                     

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

  397.                     if(run_index) run_index--;

  398.                     run_count=0;

  399.                     run_mode=0;

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

  401.                 }else{

  402.                     run_count++;

  403.                 }

  404.             }

  405.             

  406. //            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));

  407. 

  408.             if(run_mode == 0)

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

  410.         }

  411.     }

  412.     if(run_mode){

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

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

  415.             run_index++;

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

  417.         }

  418. 

  419.         if(run_count)

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

  421.     }

  422.     s->run_index= run_index;

  423. }

  424. 

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

  426.     int x,y,i;

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

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

  429.     s->run_index=0;

  430.     

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

  432.     

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

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

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

  436.         

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

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

  439. //{START_TIMER

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

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

  442.         }

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

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

  445.     }

  446. }

  447. 

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

  449.     int x, y, p, i;

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

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

  452.     s->run_index=0;

  453.     

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

  455.     

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

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

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

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

  460. 

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

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

  463.             int b= v&0xFF;

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

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

  466.             

  467.             b -= g;

  468.             r -= g;

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

  470.             b += 0x100;

  471.             r += 0x100;

  472.             

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

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

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

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

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

  478.         }

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

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

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

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

  483.         }

  484.     }

  485. }

  486. 

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

  488.     int last=0;

  489.     int i;

  490.     uint8_t state[CONTEXT_SIZE];

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

  492. 

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

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

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

  496.             last= i;

  497.         }

  498.     }

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

  500. }

  501. 

  502. static void write_header(FFV1Context *f){

  503.     uint8_t state[CONTEXT_SIZE];

  504.     int i;

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

  506. 

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

  508.     

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

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

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

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

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

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

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

  516. 

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

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

  519. }

  520. 

  521. static int common_init(AVCodecContext *avctx){

  522.     FFV1Context *s = avctx->priv_data;

  523.     int width, height;

  524. 

  525.     s->avctx= avctx;

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

  527.         

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

  529.     

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

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

  532.     

  533.     assert(width && height);

  534. 

  535.     return 0;

  536. }

  537. 

  538. static int encode_init(AVCodecContext *avctx)

  539. {

  540.     FFV1Context *s = avctx->priv_data;

  541.     int i;

  542. 

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

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

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

  546.         return -1;

  547.     }

  548.         

  549.     common_init(avctx);

  550.  

  551.     s->version=0;

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

  553.     

  554.     s->plane_count=2;

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

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

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

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

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

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

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

  562.         }else{

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

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

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

  566.         }

  567.     }

  568. 

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

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

  571.                

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

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

  574.         }else{        

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

  576.         }

  577. 

  578.         if(s->ac){

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

  580.         }else{

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

  582.         }

  583.     }

  584. 

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

  586.     switch(avctx->pix_fmt){

  587.     case PIX_FMT_YUV444P:

  588.     case PIX_FMT_YUV422P:

  589.     case PIX_FMT_YUV420P:

  590.     case PIX_FMT_YUV411P:

  591.     case PIX_FMT_YUV410P:

  592.         s->colorspace= 0;

  593.         break;

  594.     case PIX_FMT_RGBA32:

  595.         s->colorspace= 1;

  596.         break;

  597.     default:

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

  599.         return -1;

  600.     }

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

  602. 

  603.     s->picture_number=0;

  604.     

  605.     return 0;

  606. }

  607. 

  608. 

  609. static void clear_state(FFV1Context *f){

  610.     int i, j;

  611. 

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

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

  614. 

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

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

  617.         

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

  619.             if(f->ac){

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

  621.                 p->state[j][7] = 256-8;

  622.             }else{

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

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

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

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

  627.             }

  628.         }

  629.     }

  630. }

  631. 

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

  633.     FFV1Context *f = avctx->priv_data;

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

  635.     AVFrame *pict = data;

  636.     const int width= f->width;

  637.     const int height= f->height;

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

  639.     int used_count= 0;

  640.     uint8_t keystate=128;

  641. 

  642.     ff_init_range_encoder(c, buf, buf_size);

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

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

  645. 

  646.     *p = *pict;

  647.     p->pict_type= FF_I_TYPE;

  648.     

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

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

  651.         p->key_frame= 1;

  652.         write_header(f);

  653.         clear_state(f);

  654.     }else{

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

  656.         p->key_frame= 0;

  657.     }

  658. 

  659.     if(!f->ac){

  660.         used_count += ff_rac_terminate(c);

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

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

  663.     }

  664.     

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

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

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

  668. 

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

  670. 

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

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

  673.     }else{

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

  675.     }

  676.     emms_c();

  677.     

  678.     f->picture_number++;

  679. 

  680.     if(f->ac){

  681.         return ff_rac_terminate(c);

  682.     }else{

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

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

  685.     }

  686. }

  687. 

  688. static void common_end(FFV1Context *s){

  689.     int i; 

  690. 

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

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

  693. 

  694.         av_freep(&p->state);

  695.     }

  696. }

  697. 

  698. static int encode_end(AVCodecContext *avctx)

  699. {

  700.     FFV1Context *s = avctx->priv_data;

  701. 

  702.     common_end(s);

  703. 

  704.     return 0;

  705. }

  706. 

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

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

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

  710.     int x;

  711.     int run_count=0;

  712.     int run_mode=0;

  713.     int run_index= s->run_index;

  714. 

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

  716.         int diff, context, sign;

  717.          

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

  719.         if(context < 0){

  720.             context= -context;

  721.             sign=1;

  722.         }else

  723.             sign=0;

  724.         

  725. 

  726.         if(s->ac)

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

  728.         else{

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

  730.             

  731.             if(run_mode){

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

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

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

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

  736.                     }else{

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

  738.                         else run_count=0;

  739.                         if(run_index) run_index--;

  740.                         run_mode=2;

  741.                     }

  742.                 }

  743.                 run_count--;

  744.                 if(run_count < 0){

  745.                     run_mode=0;

  746.                     run_count=0;

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

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

  749.                 }else

  750.                     diff=0;

  751.             }else

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

  753.             

  754. //            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));

  755.         }

  756. 

  757.         if(sign) diff= -diff;

  758. 

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

  760.     }

  761.     s->run_index= run_index;        

  762. }

  763. 

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

  765.     int x, y;

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

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

  768. 

  769.     s->run_index=0;

  770.     

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

  772.     

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

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

  775. 

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

  777.         sample[1]= temp;

  778. 

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

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

  781.         

  782. //{START_TIMER

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

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

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

  786.         }

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

  788.     }

  789. }

  790. 

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

  792.     int x, y, p;

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

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

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

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

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

  798. 

  799.     s->run_index=0;

  800.     

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

  802.     

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

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

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

  806. 

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

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

  809. 

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

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

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

  813.         }

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

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

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

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

  818. 

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

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

  821.             

  822.             b -= 0x100;

  823.             r -= 0x100;

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

  825.             b += g;

  826.             r += g;

  827.             

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

  829.         }

  830.     }

  831. }

  832. 

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

  834.     int v;

  835.     int i=0;

  836.     uint8_t state[CONTEXT_SIZE];

  837. 

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

  839. 

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

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

  842. 

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

  844.         

  845.         while(len--){

  846.             quant_table[i] = scale*v;

  847.             i++;

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

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

  850.         }

  851.     }

  852. 

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

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

  855.     }

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

  857.     

  858.     return 2*v - 1;

  859. }

  860. 

  861. static int read_header(FFV1Context *f){

  862.     uint8_t state[CONTEXT_SIZE];

  863.     int i, context_count;

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

  865.     

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

  867. 

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

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

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

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

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

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

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

  875.     f->plane_count= 2;

  876. 

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

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

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

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

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

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

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

  884.         default:

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

  886.             return -1;

  887.         }

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

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

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

  891.             return -1;

  892.         }

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

  894.     }else{

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

  896.         return -1;

  897.     }

  898. 

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

  900. 

  901.     context_count=1;

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

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

  904.         if(context_count < 0){

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

  906.             return -1;

  907.         }

  908.     }

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

  910.     

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

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

  913. 

  914.         p->context_count= context_count;

  915. 

  916.         if(f->ac){

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

  918.         }else{

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

  920.         }

  921.     }

  922.     

  923.     return 0;

  924. }

  925. 

  926. static int decode_init(AVCodecContext *avctx)

  927. {

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

  929. 

  930.     common_init(avctx);

  931.     

  932.     return 0;

  933. }

  934. 

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

  936.     FFV1Context *f = avctx->priv_data;

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

  938.     const int width= f->width;

  939.     const int height= f->height;

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

  941.     int bytes_read;

  942.     uint8_t keystate= 128;

  943. 

  944.     AVFrame *picture = data;

  945. 

  946.     /* no supplementary picture */

  947.     if (buf_size == 0)

  948.         return 0;

  949. 

  950.     ff_init_range_decoder(c, buf, buf_size);

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

  952. 

  953. 

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

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

  956.         p->key_frame= 1;

  957.         read_header(f);

  958.         clear_state(f);

  959.     }else{

  960.         p->key_frame= 0;

  961.     }

  962. 

  963.     p->reference= 0;

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

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

  966.         return -1;

  967.     }

  968. 

  969.     if(avctx->debug&FF_DEBUG_PICT_INFO)

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

  971.     

  972.     if(!f->ac){

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

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

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

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

  977.     } else {

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

  979.     }

  980.     

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

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

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

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

  985.         

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

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

  988.     }else{

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

  990.     }

  991.         

  992.     emms_c();

  993. 

  994.     f->picture_number++;

  995. 

  996.     *picture= *p;

  997.     

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

  999. 

  1000.     *data_size = sizeof(AVFrame);

  1001.     

  1002.     if(f->ac){

  1003.         bytes_read= c->bytestream - c->bytestream_start - 1;

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

  1005.     }else{

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

  1007.     }

  1008. 

  1009.     return bytes_read;

  1010. }

  1011. 

  1012. AVCodec ffv1_decoder = {

  1013.     "ffv1",

  1014.     CODEC_TYPE_VIDEO,

  1015.     CODEC_ID_FFV1,

  1016.     sizeof(FFV1Context),

  1017.     decode_init,

  1018.     NULL,

  1019.     NULL,

  1020.     decode_frame,

  1021.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1022.     NULL

  1023. };

  1024. 

  1025. #ifdef CONFIG_ENCODERS

  1026. AVCodec ffv1_encoder = {

  1027.     "ffv1",

  1028.     CODEC_TYPE_VIDEO,

  1029.     CODEC_ID_FFV1,

  1030.     sizeof(FFV1Context),

  1031.     encode_init,

  1032.     encode_frame,

  1033.     encode_end,

  1034. };

  1035. #endif