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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. 

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

  190. }

  191. 

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

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

  194.     const int  T= last[ 0];

  195.     const int RT= last[ 1];

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

  197. 

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

  199.         const int TT= last2[0];

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

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

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

  203.     }else

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

  205. }

  206. 

  207. /**

  208.  * put 

  209.  */

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

  211.     int i;

  212. 

  213.     if(v){

  214.         const int a= ABS(v);

  215.         const int e= av_log2(a);

  216. 

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

  218.         

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

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

  221.         }

  222. 

  223.         if(e<max_exp){

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

  225. 

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

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

  228.             }

  229.             if(is_signed)

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

  231.         }

  232.     }else{

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

  234.     }

  235. }

  236. 

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

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

  239.         return 0;

  240.     else{

  241.         int i, e;

  242.  

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

  244.             int a= 1<<e;

  245. 

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

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

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

  249.                 }

  250. 

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

  252.                     return -a;

  253.                 else

  254.                     return a;

  255.             }

  256.         }

  257.         return -(1<<e);

  258.     }

  259. }

  260. 

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

  262.     int drift= state->drift;

  263.     int count= state->count;

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

  265.     drift += v;

  266. 

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

  268.         count >>= 1;

  269.         drift >>= 1;

  270.         state->error_sum >>= 1;

  271.     }

  272.     count++;

  273. 

  274.     if(drift <= -count){

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

  276.         

  277.         drift += count;

  278.         if(drift <= -count)

  279.             drift= -count + 1;

  280.     }else if(drift > 0){

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

  282.         

  283.         drift -= count;

  284.         if(drift > 0) 

  285.             drift= 0;

  286.     }

  287. 

  288.     state->drift= drift;

  289.     state->count= count;

  290. }

  291. 

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

  293.     int i, k, code;

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

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

  296.     

  297.     i= state->count;

  298.     k=0;

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

  300.         k++;

  301.         i += i;

  302.     }

  303. 

  304.     assert(k<=8);

  305. 

  306. #if 0 // JPEG LS

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

  308.     else                                         code= v;

  309. #else

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

  311. #endif

  312.     

  313.     code = -2*code-1;

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

  315. //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);

  316.     set_ur_golomb(pb, code, k, 12, 8);

  317. 

  318.     update_vlc_state(state, v);

  319. }

  320. 

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

  322.     int k, i, v, ret;

  323. 

  324.     i= state->count;

  325.     k=0;

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

  327.         k++;

  328.         i += i;

  329.     }

  330. 

  331.     assert(k<=8);

  332. 

  333.     v= get_ur_golomb(gb, k, 12, 8);

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

  335. 

  336.     v++;

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

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

  339. 

  340. #if 0 // JPEG LS

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

  342. #else

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

  344. #endif

  345. 

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

  347.     

  348.     update_vlc_state(state, v);

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

  350.     return ret;

  351. }

  352. 

  353. 

  354. 

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

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

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

  358.     int x,y;

  359.     uint8_t sample_buffer[2][w+6];

  360.     uint8_t *sample[2]= {sample_buffer[0]+3, sample_buffer[1]+3};

  361.     int run_index=0;

  362.     

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

  364.     

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

  366.         uint8_t *temp= sample[0]; //FIXME try a normal buffer

  367.         int run_count=0;

  368.         int run_mode=0;

  369. 

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

  371.         sample[1]= temp;

  372.         

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

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

  375. 

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

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

  378.             int diff, context;

  379.             

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

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

  382. 

  383.             if(context < 0){

  384.                 context = -context;

  385.                 diff= -diff;

  386.             }

  387. 

  388.             diff= (int8_t)diff;

  389. 

  390.             if(s->ac){

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

  392.             }else{

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

  394.                 

  395.                 if(run_mode){

  396. 

  397.                     if(diff){

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

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

  400.                             run_index++;

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

  402.                         }

  403.                         

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

  405.                         if(run_index) run_index--;

  406.                         run_count=0;

  407.                         run_mode=0;

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

  409.                     }else{

  410.                         run_count++;

  411.                     }

  412.                 }

  413.                 

  414. //                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));

  415. 

  416.                 if(run_mode == 0)

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

  418.             }

  419. 

  420.             sample[1][x]= temp_src[0];

  421.         }

  422.         if(run_mode){

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

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

  425.                 run_index++;

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

  427.             }

  428. 

  429.             if(run_count)

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

  431.         }

  432.     }

  433. }

  434. 

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

  436.     int last=0;

  437.     int i;

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

  439. 

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

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

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

  443.             last= i;

  444.         }

  445.     }

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

  447. }

  448. 

  449. static void write_header(FFV1Context *f){

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

  451.     int i;

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

  453. 

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

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

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

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

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

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

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

  461. 

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

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

  464. }

  465. 

  466. static int common_init(AVCodecContext *avctx){

  467.     FFV1Context *s = avctx->priv_data;

  468.     int width, height;

  469. 

  470.     s->avctx= avctx;

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

  472.         

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

  474.     

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

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

  477.     

  478.     assert(width && height);

  479. 

  480.     return 0;

  481. }

  482. 

  483. static int encode_init(AVCodecContext *avctx)

  484. {

  485.     FFV1Context *s = avctx->priv_data;

  486.     int i;

  487. 

  488.     common_init(avctx);

  489.  

  490.     s->version=0;

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

  492.     

  493.     s->plane_count=2;

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

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

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

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

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

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

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

  501.         }else{

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

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

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

  505.         }

  506.     }

  507. 

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

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

  510.                

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

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

  513.         }else{        

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

  515.         }

  516. 

  517.         if(s->ac){

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

  519.         }else{

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

  521.         }

  522.     }

  523. 

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

  525.     switch(avctx->pix_fmt){

  526.     case PIX_FMT_YUV444P:

  527.     case PIX_FMT_YUV422P:

  528.     case PIX_FMT_YUV420P:

  529.     case PIX_FMT_YUV411P:

  530.     case PIX_FMT_YUV410P:

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

  532.         break;

  533.     default:

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

  535.         return -1;

  536.     }

  537.     

  538.    

  539.     s->picture_number=0;

  540.     

  541.     return 0;

  542. }

  543. 

  544. 

  545. static void clear_state(FFV1Context *f){

  546.     int i, j;

  547. 

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

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

  550. 

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

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

  553.         

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

  555.             if(f->ac){

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

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

  558.             }else{

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

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

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

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

  563.             }

  564.         }

  565.     }

  566. }

  567. 

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

  569.     FFV1Context *f = avctx->priv_data;

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

  571.     AVFrame *pict = data;

  572.     const int width= f->width;

  573.     const int height= f->height;

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

  575.     int used_count= 0;

  576. 

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

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

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

  580.         return -1;

  581.     }

  582.         

  583.     ff_init_cabac_encoder(c, buf, buf_size);

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

  585.     

  586.     *p = *pict;

  587.     p->pict_type= FF_I_TYPE;

  588.     

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

  590.         put_cabac_bypass(c, 1);

  591.         p->key_frame= 1;

  592.         write_header(f);

  593.         clear_state(f);

  594.     }else{

  595.         put_cabac_bypass(c, 0);

  596.         p->key_frame= 0;

  597.     }

  598. 

  599.     if(!f->ac){

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

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

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

  603.     }

  604.     

  605.     if(1){

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

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

  608. 

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

  610. 

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

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

  613.     }

  614.     emms_c();

  615.     

  616.     f->picture_number++;

  617. 

  618.     if(f->ac){

  619.         return put_cabac_terminate(c, 1);

  620.     }else{

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

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

  623.     }

  624. }

  625. 

  626. static void common_end(FFV1Context *s){

  627.     int i; 

  628. 

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

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

  631. 

  632.         av_freep(&p->state);

  633.     }

  634. }

  635. 

  636. static int encode_end(AVCodecContext *avctx)

  637. {

  638.     FFV1Context *s = avctx->priv_data;

  639. 

  640.     common_end(s);

  641. 

  642.     return 0;

  643. }

  644. 

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

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

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

  648.     int x,y;

  649.     uint8_t sample_buffer[2][w+6];

  650.     uint8_t *sample[2]= {sample_buffer[0]+3, sample_buffer[1]+3};

  651.     int run_index=0;

  652.     

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

  654.     

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

  656.         uint8_t *temp= sample[0]; //FIXME try a normal buffer

  657.         int run_count=0;

  658.         int run_mode=0;

  659. 

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

  661.         sample[1]= temp;

  662. 

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

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

  665. 

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

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

  668.             int diff, context, sign;

  669.              

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

  671.             if(context < 0){

  672.                 context= -context;

  673.                 sign=1;

  674.             }else

  675.                 sign=0;

  676.             

  677. 

  678.             if(s->ac)

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

  680.             else{

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

  682.                 

  683.                 if(run_mode){

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

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

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

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

  688.                         }else{

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

  690.                             else run_count=0;

  691.                             if(run_index) run_index--;

  692.                             run_mode=2;

  693.                         }

  694.                     }

  695.                     run_count--;

  696.                     if(run_count < 0){

  697.                         run_mode=0;

  698.                         run_count=0;

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

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

  701.                     }else

  702.                         diff=0;

  703.                 }else

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

  705.                 

  706. //                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));

  707.             }

  708. 

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

  710. 

  711.             sample[1][x]=

  712.             temp_src[0] = predict(sample[1] + x, sample[0] + x) + diff;

  713.             

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

  715.         }

  716.     }

  717. }

  718. 

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

  720.     int v;

  721.     int i=0;

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

  723. 

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

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

  726. 

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

  728.         

  729.         while(len--){

  730.             quant_table[i] = scale*v;

  731.             i++;

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

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

  734.         }

  735.     }

  736. 

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

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

  739.     }

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

  741.     

  742.     return 2*v - 1;

  743. }

  744. 

  745. static int read_header(FFV1Context *f){

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

  747.     int i, context_count;

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

  749.     

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

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

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

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

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

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

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

  757.     f->plane_count= 2;

  758. 

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

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

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

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

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

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

  765.     default:

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

  767.         return -1;

  768.     }

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

  770. 

  771.     context_count=1;

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

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

  774.         if(context_count < 0){

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

  776.             return -1;

  777.         }

  778.     }

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

  780.     

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

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

  783. 

  784.         p->context_count= context_count;

  785. 

  786.         if(f->ac){

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

  788.         }else{

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

  790.         }

  791.     }

  792.     

  793.     return 0;

  794. }

  795. 

  796. static int decode_init(AVCodecContext *avctx)

  797. {

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

  799. 

  800.     common_init(avctx);

  801.     

  802. #if 0    

  803.     switch(s->bitstream_bpp){

  804.     case 12:

  805.         avctx->pix_fmt = PIX_FMT_YUV420P;

  806.         break;

  807.     case 16:

  808.         avctx->pix_fmt = PIX_FMT_YUV422P;

  809.         break;

  810.     case 24:

  811.     case 32:

  812.         if(s->bgr32){

  813.             avctx->pix_fmt = PIX_FMT_RGBA32;

  814.         }else{

  815.             avctx->pix_fmt = PIX_FMT_BGR24;

  816.         }

  817.         break;

  818.     default:

  819.         assert(0);

  820.     }

  821. #endif

  822.     

  823.     return 0;

  824. }

  825. 

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

  827.     FFV1Context *f = avctx->priv_data;

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

  829.     const int width= f->width;

  830.     const int height= f->height;

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

  832.     int bytes_read;

  833. 

  834.     AVFrame *picture = data;

  835. 

  836.     *data_size = 0;

  837. 

  838.     /* no supplementary picture */

  839.     if (buf_size == 0)

  840.         return 0;

  841. 

  842.     ff_init_cabac_decoder(c, buf, buf_size);

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

  844. 

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

  846.     if(get_cabac_bypass(c)){

  847.         p->key_frame= 1;

  848.         read_header(f);

  849.         clear_state(f);

  850.     }else{

  851.         p->key_frame= 0;

  852.     }

  853. 

  854.     p->reference= 0;

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

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

  857.         return -1;

  858.     }

  859. 

  860.     if(avctx->debug&FF_DEBUG_PICT_INFO)

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

  862.     

  863.     if(!f->ac){

  864.         bytes_read = get_cabac_terminate(c);

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

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

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

  868.     } else {

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

  870.     }

  871.     

  872.     if(1){

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

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

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

  876.         

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

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

  879.     }

  880.         

  881.     emms_c();

  882. 

  883.     f->picture_number++;

  884. 

  885.     *picture= *p;

  886.     

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

  888. 

  889.     *data_size = sizeof(AVFrame);

  890.     

  891.     if(f->ac){

  892.         bytes_read= get_cabac_terminate(c);

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

  894.     }else{

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

  896.     }

  897. 

  898.     return bytes_read;

  899. }

  900. 

  901. static int decode_end(AVCodecContext *avctx)

  902. {

  903.     FFV1Context *s = avctx->priv_data;

  904.     int i;

  905.     

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

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

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

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

  910.         }

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

  912.     }

  913. 

  914.     return 0;

  915. }

  916. 

  917. AVCodec ffv1_decoder = {

  918.     "ffv1",

  919.     CODEC_TYPE_VIDEO,

  920.     CODEC_ID_FFV1,

  921.     sizeof(FFV1Context),

  922.     decode_init,

  923.     NULL,

  924.     decode_end,

  925.     decode_frame,

  926.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  927.     NULL

  928. };

  929. 

  930. #ifdef CONFIG_ENCODERS

  931. AVCodec ffv1_encoder = {

  932.     "ffv1",

  933.     CODEC_TYPE_VIDEO,

  934.     CODEC_ID_FFV1,

  935.     sizeof(FFV1Context),

  936.     encode_init,

  937.     encode_frame,

  938.     encode_end,

  939. };

  940. #endif