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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 (a experimental lossless codec)

  25.  */

  26. 

  27. #include "common.h"

  28. #include "avcodec.h"

  29. #include "dsputil.h"

  30. #include "cabac.h"

  31. #include "golomb.h"

  32. 

  33. #define MAX_PLANES 4

  34. #define CONTEXT_SIZE 32

  35. 

  36. static const int8_t quant3[256]={

  37.  0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  38.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  39.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  40.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  41.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  42.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  43.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  44.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  45. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  46. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  47. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  48. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  49. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  50. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  51. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  52. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0,

  53. };

  54. static const int8_t quant5[256]={

  55.  0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  56.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  57.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  58.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  59.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  60.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  61.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  62.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  63. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  64. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  65. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  66. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  67. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  68. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  69. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  70. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,-1,

  71. };

  72. static const int8_t quant7[256]={

  73.  0, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  74.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  75.  2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,

  76.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  77.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  78.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  79.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  80.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  81. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  82. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  83. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  84. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  85. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  86. -3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,

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

  88. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,

  89. };

  90. static const int8_t quant9[256]={

  91.  0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  92.  3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  93.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  94.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  95.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  96.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  97.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  98.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  99. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  100. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  101. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  102. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  103. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  104. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  105. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,

  106. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-1,-1,

  107. };

  108. static const int8_t quant11[256]={

  109.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

  110.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  111.  4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  112.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  113.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  114.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  115.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  116.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  117. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  118. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  119. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  120. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  121. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  122. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-4,-4,

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

  124. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  125. };

  126. static const int8_t quant13[256]={

  127.  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  128.  4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

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

  130.  5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  131.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  132.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  133.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  134.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  135. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  136. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  137. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  138. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  139. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-5,

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

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

  142. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,

  143. };

  144. 

  145. static const uint8_t log2_run[32]={

  146.  0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 

  147.  4, 4, 5, 5, 6, 6, 7, 7, 

  148.  8, 9,10,11,12,13,14,15,

  149. };

  150. 

  151. typedef struct VlcState{

  152.     int16_t drift;

  153.     uint16_t error_sum;

  154.     int8_t bias;

  155.     uint8_t count;

  156. } VlcState;

  157. 

  158. typedef struct PlaneContext{

  159.     int context_count;

  160.     uint8_t (*state)[CONTEXT_SIZE];

  161.     VlcState *vlc_state;

  162.     uint8_t interlace_bit_state[2];

  163. } PlaneContext;

  164. 

  165. typedef struct FFV1Context{

  166.     AVCodecContext *avctx;

  167.     CABACContext c;

  168.     GetBitContext gb;

  169.     PutBitContext pb;

  170.     int version;

  171.     int width, height;

  172.     int chroma_h_shift, chroma_v_shift;

  173.     int flags;

  174.     int picture_number;

  175.     AVFrame picture;

  176.     int plane_count;

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

  178.     PlaneContext plane[MAX_PLANES];

  179.     int16_t quant_table[5][256];

  180.     

  181.     DSPContext dsp; 

  182. }FFV1Context;

  183. 

  184. static inline int predict(uint8_t *src, uint8_t *last){

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

  186.     const int  T= last[ 0];

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

  188.     uint8_t *cm = cropTbl + MAX_NEG_CROP;    

  189.     const int gradient= cm[L + T - LT];

  190. 

  191.     return mid_pred(L, gradient, T);

  192. }

  193. 

  194. static inline int get_context(FFV1Context *f, uint8_t *src, uint8_t *last, uint8_t *last2){

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

  196.     const int  T= last[ 0];

  197.     const int RT= last[ 1];

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

  199. 

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

  201.         const int TT= last2[0];

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

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

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

  205.     }else

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

  207. }

  208. 

  209. /**

  210.  * put 

  211.  */

  212. static inline void put_symbol(CABACContext *c, uint8_t *state, int v, int is_signed, int max_exp){

  213.     int i;

  214. 

  215.     if(v){

  216.         const int a= ABS(v);

  217.         const int e= av_log2(a);

  218. 

  219.         put_cabac(c, state+0, 0);

  220.         

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

  222.             put_cabac(c, state+1+i, 1);  //1..8

  223.         }

  224. 

  225.         if(e<max_exp){

  226.             put_cabac(c, state+1+i, 0);      //1..8

  227. 

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

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

  230.             }

  231.             if(is_signed)

  232.                 put_cabac(c, state+9 + e, v < 0); //9..16

  233.         }

  234.     }else{

  235.         put_cabac(c, state+0, 1);

  236.     }

  237. }

  238. 

  239. static inline int get_symbol(CABACContext *c, uint8_t *state, int is_signed, int max_exp){

  240.     if(get_cabac(c, state+0))

  241.         return 0;

  242.     else{

  243.         int i, e;

  244.  

  245.         for(e=0; e<max_exp; e++){ 

  246.             int a= 1<<e;

  247. 

  248.             if(get_cabac(c, state + 1 + e)==0){ // 1..8

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

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

  251.                 }

  252. 

  253.                 if(is_signed && get_cabac(c, state+9 + e)) //9..16

  254.                     return -a;

  255.                 else

  256.                     return a;

  257.             }

  258.         }

  259.         return -(1<<e);

  260.     }

  261. }

  262. 

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

  264.     int drift= state->drift;

  265.     int count= state->count;

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

  267.     drift += v;

  268. 

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

  270.         count >>= 1;

  271.         drift >>= 1;

  272.         state->error_sum >>= 1;

  273.     }

  274.     count++;

  275. 

  276.     if(drift <= -count){

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

  278.         

  279.         drift += count;

  280.         if(drift <= -count)

  281.             drift= -count + 1;

  282.     }else if(drift > 0){

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

  284.         

  285.         drift -= count;

  286.         if(drift > 0) 

  287.             drift= 0;

  288.     }

  289. 

  290.     state->drift= drift;

  291.     state->count= count;

  292. }

  293. 

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

  295.     int i, k, code;

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

  297.     v = (int8_t)(v - state->bias);

  298.     

  299.     i= state->count;

  300.     k=0;

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

  302.         k++;

  303.         i += i;

  304.     }

  305. #if 0 // JPEG LS

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

  307.     else                                         code= v;

  308. #else

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

  310. #endif

  311.     

  312.     code = -2*code-1;

  313.     code^= (code>>31);

  314. //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);

  315.     set_ur_golomb(pb, code, k, 8, 8);

  316. 

  317.     update_vlc_state(state, v);

  318. }

  319. 

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

  321.     int k, i, v, ret;

  322. 

  323.     i= state->count;

  324.     k=0;

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

  326.         k++;

  327.         i += i;

  328.     }

  329.     

  330.     v= get_ur_golomb(gb, k, 8, 8);

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

  332.     

  333.     v++;

  334.     if(v&1) v=  (v>>1);

  335.     else    v= -(v>>1);

  336. 

  337. #if 0 // JPEG LS

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

  339. #else

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

  341. #endif

  342. 

  343.     ret= (int8_t)(v + state->bias);

  344.     

  345.     update_vlc_state(state, v);

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

  347.     return ret;

  348. }

  349. 

  350. 

  351. 

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

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

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

  355.     int x,y;

  356.     uint8_t pred_diff_buffer[4][w+6]; //FIXME rema,e

  357.     uint8_t *pred_diff[4]= {pred_diff_buffer[0]+3, pred_diff_buffer[1]+3, pred_diff_buffer[2]+3, pred_diff_buffer[3]+3};

  358.     int run_index=0;

  359.     

  360.     memset(pred_diff_buffer, 0, sizeof(pred_diff_buffer));

  361.     

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

  363.         uint8_t *temp= pred_diff[0]; //FIXME try a normal buffer

  364.         int run_count=0;

  365.         int run_mode=0;

  366. 

  367.         pred_diff[0]= pred_diff[1];

  368.         pred_diff[1]= pred_diff[2];

  369.         pred_diff[2]= pred_diff[3];

  370.         pred_diff[3]= temp;

  371.         

  372.         pred_diff[3][-1]= pred_diff[2][0  ];

  373.         pred_diff[2][ w]= pred_diff[2][w-1];

  374. 

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

  376.             uint8_t *temp_src= src + x + stride*y;

  377.             int diff, context;

  378.             

  379.             context= get_context(s, pred_diff[3]+x, pred_diff[2]+x, pred_diff[1]+x);

  380.             diff= temp_src[0] - predict(pred_diff[3]+x, pred_diff[2]+x);

  381. 

  382.             if(context < 0){

  383.                 context = -context;

  384.                 diff= -diff;

  385.             }

  386. 

  387.             diff= (int8_t)diff;

  388. 

  389.             if(s->ac){

  390.                 put_symbol(c, p->state[context], diff, 1, 7);

  391.             }else{

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

  393.                 

  394.                 if(run_mode){

  395. 

  396.                     if(diff){

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

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

  399.                             run_index++;

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

  401.                         }

  402.                         

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

  404.                         if(run_index) run_index--;

  405.                         run_count=0;

  406.                         run_mode=0;

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

  408.                     }else{

  409.                         run_count++;

  410.                     }

  411.                 }

  412.                 

  413. //                printf("count:%d index:%d, mode:%d, x:%d y:%d pos:%d\n", run_count, run_index, run_mode, x, y, (int)get_bit_count(&s->pb));

  414. 

  415.                 if(run_mode == 0)

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

  417.             }

  418. 

  419.             pred_diff[3][x]= temp_src[0];

  420.         }

  421.         if(run_mode){

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

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

  424.                 run_index++;

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

  426.             }

  427. 

  428.             if(run_count)

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

  430.         }

  431.     }

  432. }

  433. 

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

  435.     int last=0;

  436.     int i;

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

  438. 

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

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

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

  442.             last= i;

  443.         }

  444.     }

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

  446. }

  447. 

  448. static void write_header(FFV1Context *f){

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

  450.     int i;

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

  452. 

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

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

  455.     put_symbol(c, state, 0, 0, 7); //YUV cs type 

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

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

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

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

  460. 

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

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

  463. }

  464. 

  465. static int common_init(AVCodecContext *avctx){

  466.     FFV1Context *s = avctx->priv_data;

  467.     int width, height;

  468. 

  469.     s->avctx= avctx;

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

  471.         

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

  473.     

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

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

  476.     

  477.     assert(width && height);

  478. 

  479.     return 0;

  480. }

  481. 

  482. static int encode_init(AVCodecContext *avctx)

  483. {

  484.     FFV1Context *s = avctx->priv_data;

  485.     int i;

  486. 

  487.     common_init(avctx);

  488.  

  489.     s->version=0;

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

  491.     

  492.     s->plane_count=3;

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

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

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

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

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

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

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

  500.         }else{

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

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

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

  504.         }

  505.     }

  506. 

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

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

  509.                

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

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

  512.         }else{        

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

  514.         }

  515. 

  516.         if(s->ac){

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

  518.         }else{

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

  520.         }

  521.     }

  522. 

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

  524.     switch(avctx->pix_fmt){

  525.     case PIX_FMT_YUV444P:

  526.     case PIX_FMT_YUV422P:

  527.     case PIX_FMT_YUV420P:

  528.     case PIX_FMT_YUV411P:

  529.     case PIX_FMT_YUV410P:

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

  531.         break;

  532.     default:

  533.         fprintf(stderr, "format not supported\n");

  534.         return -1;

  535.     }

  536.     

  537.    

  538.     s->picture_number=0;

  539.     

  540.     return 0;

  541. }

  542. 

  543. 

  544. static void clear_state(FFV1Context *f){

  545.     int i, j;

  546. 

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

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

  549. 

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

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

  552.         

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

  554.             if(f->ac){

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

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

  557.             }else{

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

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

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

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

  562.             }

  563.         }

  564.     }

  565. }

  566. 

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

  568.     FFV1Context *f = avctx->priv_data;

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

  570.     AVFrame *pict = data;

  571.     const int width= f->width;

  572.     const int height= f->height;

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

  574.     int used_count= 0;

  575. 

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

  577.         printf("this codec is under development, files encoded with it wont be decodeable with future versions!!!\n"

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

  579.         return -1;

  580.     }

  581.         

  582.     ff_init_cabac_encoder(c, buf, buf_size);

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

  584.     

  585.     *p = *pict;

  586.     p->pict_type= FF_I_TYPE;

  587.     

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

  589.         put_cabac_bypass(c, 1);

  590.         p->key_frame= 1;

  591.         write_header(f);

  592.         clear_state(f);

  593.     }else{

  594.         put_cabac_bypass(c, 0);

  595.         p->key_frame= 0;

  596.     }

  597. 

  598.     if(!f->ac){

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

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

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

  602.     }

  603.     

  604.     if(1){

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

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

  607. 

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

  609. 

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

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

  612.     }

  613.     emms_c();

  614.     

  615.     f->picture_number++;

  616. 

  617.     if(f->ac){

  618.         return put_cabac_terminate(c, 1);

  619.     }else{

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

  621.         return used_count + (get_bit_count(&f->pb)+7)/8;

  622.     }

  623. }

  624. 

  625. static void common_end(FFV1Context *s){

  626.     int i; 

  627. 

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

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

  630. 

  631.         av_freep(&p->state);

  632.     }

  633. }

  634. 

  635. static int encode_end(AVCodecContext *avctx)

  636. {

  637.     FFV1Context *s = avctx->priv_data;

  638. 

  639.     common_end(s);

  640. 

  641.     return 0;

  642. }

  643. 

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

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

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

  647.     int x,y;

  648.     uint8_t pred_diff_buffer[4][w+6];

  649.     uint8_t *pred_diff[4]= {pred_diff_buffer[0]+3, pred_diff_buffer[1]+3, pred_diff_buffer[2]+3, pred_diff_buffer[3]+3};

  650.     int run_index=0;

  651.     

  652.     memset(pred_diff_buffer, 0, sizeof(pred_diff_buffer));

  653.     

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

  655.         uint8_t *temp= pred_diff[0]; //FIXME try a normal buffer

  656.         int run_count=0;

  657.         int run_mode=0;

  658. 

  659.         pred_diff[0]= pred_diff[1];

  660.         pred_diff[1]= pred_diff[2];

  661.         pred_diff[2]= pred_diff[3];

  662.         pred_diff[3]= temp;

  663. 

  664.         pred_diff[3][-1]= pred_diff[2][0  ];

  665.         pred_diff[2][ w]= pred_diff[2][w-1];

  666. 

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

  668.             uint8_t *temp_src= src + x + stride*y;

  669.             int diff, context, sign;

  670.              

  671.             context= get_context(s, pred_diff[3] + x, pred_diff[2] + x, pred_diff[1] + x);

  672.             if(context < 0){

  673.                 context= -context;

  674.                 sign=1;

  675.             }else

  676.                 sign=0;

  677.             

  678. 

  679.             if(s->ac)

  680.                 diff= get_symbol(c, p->state[context], 1, 7);

  681.             else{

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

  683.                 

  684.                 if(run_mode){

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

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

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

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

  689.                         }else{

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

  691.                             else run_count=0;

  692.                             if(run_index) run_index--;

  693.                             run_mode=2;

  694.                         }

  695.                     }

  696.                     run_count--;

  697.                     if(run_count < 0){

  698.                         run_mode=0;

  699.                         run_count=0;

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

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

  702.                     }else

  703.                         diff=0;

  704.                 }else

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

  706.                 

  707. //                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));

  708.             }

  709. 

  710.             if(sign) diff= (int8_t)(-diff); //FIXME remove cast

  711. 

  712.             pred_diff[3][x]=

  713.             temp_src[0] = predict(pred_diff[3] + x, pred_diff[2] + x) + diff;

  714.             

  715.             assert(diff>= -128 && diff <= 127);

  716.         }

  717.     }

  718. }

  719. 

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

  721.     int v;

  722.     int i=0;

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

  724. 

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

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

  727. 

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

  729.         

  730.         while(len--){

  731.             quant_table[i] = scale*v;

  732.             i++;

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

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

  735.         }

  736.     }

  737. 

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

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

  740.     }

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

  742.     

  743.     return 2*v - 1;

  744. }

  745. 

  746. static int read_header(FFV1Context *f){

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

  748.     int i, context_count;

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

  750.     

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

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

  753.     get_symbol(c, state, 0, 7); //YUV cs type

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

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

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

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

  758.     f->plane_count= 3;

  759. 

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

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

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

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

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

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

  766.     default:

  767.         fprintf(stderr, "format not supported\n");

  768.         return -1;

  769.     }

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

  771. 

  772.     context_count=1;

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

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

  775.         if(context_count < 0){

  776.             printf("read_quant_table error\n");

  777.             return -1;

  778.         }

  779.     }

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

  781.     

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

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

  784. 

  785.         p->context_count= context_count;

  786. 

  787.         if(f->ac){

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

  789.         }else{

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

  791.         }

  792.     }

  793.     

  794.     return 0;

  795. }

  796. 

  797. static int decode_init(AVCodecContext *avctx)

  798. {

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

  800. 

  801.     common_init(avctx);

  802.     

  803. #if 0    

  804.     switch(s->bitstream_bpp){

  805.     case 12:

  806.         avctx->pix_fmt = PIX_FMT_YUV420P;

  807.         break;

  808.     case 16:

  809.         avctx->pix_fmt = PIX_FMT_YUV422P;

  810.         break;

  811.     case 24:

  812.     case 32:

  813.         if(s->bgr32){

  814.             avctx->pix_fmt = PIX_FMT_RGBA32;

  815.         }else{

  816.             avctx->pix_fmt = PIX_FMT_BGR24;

  817.         }

  818.         break;

  819.     default:

  820.         assert(0);

  821.     }

  822. #endif

  823.     

  824.     return 0;

  825. }

  826. 

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

  828.     FFV1Context *f = avctx->priv_data;

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

  830.     const int width= f->width;

  831.     const int height= f->height;

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

  833.     int bytes_read;

  834. 

  835.     AVFrame *picture = data;

  836. 

  837.     *data_size = 0;

  838. 

  839.     /* no supplementary picture */

  840.     if (buf_size == 0)

  841.         return 0;

  842. 

  843.     ff_init_cabac_decoder(c, buf, buf_size);

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

  845. 

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

  847.     if(get_cabac_bypass(c)){

  848.         p->key_frame= 1;

  849.         read_header(f);

  850.         clear_state(f);

  851.     }else{

  852.         p->key_frame= 0;

  853.     }

  854. 

  855.     p->reference= 0;

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

  857.         fprintf(stderr, "get_buffer() failed\n");

  858.         return -1;

  859.     }

  860. 

  861.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  862.         printf("keyframe:%d coder:%d\n", p->key_frame, f->ac);

  863.     

  864.     if(!f->ac){

  865.         bytes_read = get_cabac_terminate(c);

  866.         if(bytes_read ==0) printf("error at end of AC stream\n");

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

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

  869.     }

  870.     

  871.     if(1){

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

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

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

  875.         

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

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

  878.     }

  879.         

  880.     emms_c();

  881. 

  882.     f->picture_number++;

  883. 

  884.     *picture= *p;

  885.     

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

  887. 

  888.     *data_size = sizeof(AVFrame);

  889.     

  890.     if(f->ac){

  891.         bytes_read= get_cabac_terminate(c);

  892.         if(bytes_read ==0) printf("error at end of frame\n");

  893.     }else{

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

  895.     }

  896. 

  897.     return bytes_read;

  898. }

  899. 

  900. static int decode_end(AVCodecContext *avctx)

  901. {

  902.     FFV1Context *s = avctx->priv_data;

  903.     int i;

  904.     

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

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

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

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

  909.         }

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

  911.     }

  912. 

  913.     return 0;

  914. }

  915. 

  916. AVCodec ffv1_decoder = {

  917.     "ffv1",

  918.     CODEC_TYPE_VIDEO,

  919.     CODEC_ID_FFV1,

  920.     sizeof(FFV1Context),

  921.     decode_init,

  922.     NULL,

  923.     decode_end,

  924.     decode_frame,

  925.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  926.     NULL

  927. };

  928. 

  929. #ifdef CONFIG_ENCODERS

  930. AVCodec ffv1_encoder = {

  931.     "ffv1",

  932.     CODEC_TYPE_VIDEO,

  933.     CODEC_ID_FFV1,

  934.     sizeof(FFV1Context),

  935.     encode_init,

  936.     encode_frame,

  937.     encode_end,

  938. };

  939. #endif