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FFmpeg/libavcodec/ffv1.c

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  1. /*

  2.  * FFV1 codec for libavcodec

  3.  *

  4.  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>

  5.  *

  6.  * This library is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2 of the License, or (at your option) any later version.

  10.  *

  11.  * This library is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with this library; if not, write to the Free Software

  18.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  19.  *

  20.  */

  21.  

  22. /**

  23.  * @file ffv1.c

  24.  * FF Video Codec 1 (an experimental lossless codec)

  25.  */

  26. 

  27. #include "common.h"

  28. #include "bitstream.h"

  29. #include "avcodec.h"

  30. #include "dsputil.h"

  31. #include "rangecoder.h"

  32. #include "golomb.h"

  33. 

  34. #define MAX_PLANES 4

  35. #define CONTEXT_SIZE 32

  36. 

  37. static const int8_t quant3[256]={

  38.  0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  54. };

  55. static const int8_t quant5[256]={

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  72. };

  73. static const int8_t quant7[256]={

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  90. };

  91. static const int8_t quant9[256]={

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  108. };

  109. static const int8_t quant11[256]={

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  126. };

  127. static const int8_t quant13[256]={

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

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

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

  131.  5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

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

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

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

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

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

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

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

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

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

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

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

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

  144. };

  145. 

  146. static const uint8_t log2_run[32]={

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

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

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

  150. };

  151. 

  152. typedef struct VlcState{

  153.     int16_t drift;

  154.     uint16_t error_sum;

  155.     int8_t bias;

  156.     uint8_t count;

  157. } VlcState;

  158. 

  159. typedef struct PlaneContext{

  160.     int context_count;

  161.     uint8_t (*state)[CONTEXT_SIZE];

  162.     VlcState *vlc_state;

  163.     uint8_t interlace_bit_state[2];

  164. } PlaneContext;

  165. 

  166. typedef struct FFV1Context{

  167.     AVCodecContext *avctx;

  168.     RangeCoder c;

  169.     GetBitContext gb;

  170.     PutBitContext pb;

  171.     int version;

  172.     int width, height;

  173.     int chroma_h_shift, chroma_v_shift;

  174.     int flags;

  175.     int picture_number;

  176.     AVFrame picture;

  177.     int plane_count;

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

  179.     PlaneContext plane[MAX_PLANES];

  180.     int16_t quant_table[5][256];

  181.     int run_index;

  182.     int colorspace;

  183.     

  184.     DSPContext dsp; 

  185. }FFV1Context;

  186. 

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

  188.     if(bits==8)

  189.         diff= (int8_t)diff;

  190.     else{

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

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

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

  194.     }

  195. 

  196.     return diff;

  197. }

  198. 

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

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

  201.     const int  T= last[ 0];

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

  203. 

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

  205. }

  206. 

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

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

  209.     const int  T= last[ 0];

  210.     const int RT= last[ 1];

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

  212. 

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

  214.         const int TT= last2[0];

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

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

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

  218.     }else

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

  220. }

  221. 

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

  223.     int i;

  224. 

  225.     if(v){

  226.         const int a= ABS(v);

  227.         const int e= av_log2(a);

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

  229.         

  230.         assert(e<=9);

  231. 

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

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

  234.         }

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

  236. 

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

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

  239.         }

  240. 

  241.         if(is_signed)

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

  243.     }else{

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

  245.     }

  246. }

  247. 

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

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

  250.         return 0;

  251.     else{

  252.         int i, e, a;

  253.         e= 0;

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

  255.             e++;

  256.         }

  257.         assert(e<=9);

  258. 

  259.         a= 1;

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

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

  262.         }

  263. 

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

  265.             return -a;

  266.         else

  267.             return a;

  268.     }

  269. }

  270. 

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

  272.     int drift= state->drift;

  273.     int count= state->count;

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

  275.     drift += v;

  276. 

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

  278.         count >>= 1;

  279.         drift >>= 1;

  280.         state->error_sum >>= 1;

  281.     }

  282.     count++;

  283. 

  284.     if(drift <= -count){

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

  286.         

  287.         drift += count;

  288.         if(drift <= -count)

  289.             drift= -count + 1;

  290.     }else if(drift > 0){

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

  292.         

  293.         drift -= count;

  294.         if(drift > 0) 

  295.             drift= 0;

  296.     }

  297. 

  298.     state->drift= drift;

  299.     state->count= count;

  300. }

  301. 

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

  303.     int i, k, code;

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

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

  306. 

  307.     i= state->count;

  308.     k=0;

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

  310.         k++;

  311.         i += i;

  312.     }

  313. 

  314.     assert(k<=8);

  315. 

  316. #if 0 // JPEG LS

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

  318.     else                                         code= v;

  319. #else

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

  321. #endif

  322.     

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

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

  325. 

  326.     update_vlc_state(state, v);

  327. }

  328. 

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

  330.     int k, i, v, ret;

  331. 

  332.     i= state->count;

  333.     k=0;

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

  335.         k++;

  336.         i += i;

  337.     }

  338. 

  339.     assert(k<=8);

  340. 

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

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

  343. 

  344. #if 0 // JPEG LS

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

  346. #else

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

  348. #endif

  349. 

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

  351.     

  352.     update_vlc_state(state, v);

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

  354.     return ret;

  355. }

  356. 

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

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

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

  360.     int x;

  361.     int run_index= s->run_index;

  362.     int run_count=0;

  363.     int run_mode=0;

  364. 

  365.     if(s->ac){

  366.         if(c->bytestream_end - c->bytestream < w*20){

  367.             av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");

  368.             return -1;

  369.         }

  370.     }else{

  371.         if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < w*4){

  372.             av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");

  373.             return -1;

  374.         }

  375.     }

  376. 

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

  378.         int diff, context;

  379.         

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

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

  382. 

  383.         if(context < 0){

  384.             context = -context;

  385.             diff= -diff;

  386.         }

  387. 

  388.         diff= fold(diff, bits);

  389.         

  390.         if(s->ac){

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

  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)put_bits_count(&s->pb));

  415. 

  416.             if(run_mode == 0)

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

  418.         }

  419.     }

  420.     if(run_mode){

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

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

  423.             run_index++;

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

  425.         }

  426. 

  427.         if(run_count)

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

  429.     }

  430.     s->run_index= run_index;

  431.     

  432.     return 0;

  433. }

  434. 

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

  436.     int x,y,i;

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

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

  439.     s->run_index=0;

  440.     

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

  442.     

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

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

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

  446.         

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

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

  449. //{START_TIMER

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

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

  452.         }

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

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

  455.     }

  456. }

  457. 

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

  459.     int x, y, p, i;

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

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

  462.     s->run_index=0;

  463.     

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

  465.     

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

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

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

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

  470. 

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

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

  473.             int b= v&0xFF;

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

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

  476.             

  477.             b -= g;

  478.             r -= g;

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

  480.             b += 0x100;

  481.             r += 0x100;

  482.             

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

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

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

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

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

  488.         }

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

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

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

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

  493.         }

  494.     }

  495. }

  496. 

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

  498.     int last=0;

  499.     int i;

  500.     uint8_t state[CONTEXT_SIZE];

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

  502. 

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

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

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

  506.             last= i;

  507.         }

  508.     }

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

  510. }

  511. 

  512. static void write_header(FFV1Context *f){

  513.     uint8_t state[CONTEXT_SIZE];

  514.     int i;

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

  516. 

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

  518.     

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

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

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

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

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

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

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

  526. 

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

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

  529. }

  530. 

  531. static int common_init(AVCodecContext *avctx){

  532.     FFV1Context *s = avctx->priv_data;

  533.     int width, height;

  534. 

  535.     s->avctx= avctx;

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

  537.         

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

  539.     

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

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

  542.     

  543.     assert(width && height);

  544. 

  545.     return 0;

  546. }

  547. 

  548. static int encode_init(AVCodecContext *avctx)

  549. {

  550.     FFV1Context *s = avctx->priv_data;

  551.     int i;

  552. 

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

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

  555.                "use vstrict=-1 / -strict -1 to use it anyway\n");

  556.         return -1;

  557.     }

  558.         

  559.     common_init(avctx);

  560.  

  561.     s->version=0;

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

  563.     

  564.     s->plane_count=2;

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

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

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

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

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

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

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

  572.         }else{

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

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

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

  576.         }

  577.     }

  578. 

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

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

  581.                

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

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

  584.         }else{        

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

  586.         }

  587. 

  588.         if(s->ac){

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

  590.         }else{

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

  592.         }

  593.     }

  594. 

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

  596.     switch(avctx->pix_fmt){

  597.     case PIX_FMT_YUV444P:

  598.     case PIX_FMT_YUV422P:

  599.     case PIX_FMT_YUV420P:

  600.     case PIX_FMT_YUV411P:

  601.     case PIX_FMT_YUV410P:

  602.         s->colorspace= 0;

  603.         break;

  604.     case PIX_FMT_RGBA32:

  605.         s->colorspace= 1;

  606.         break;

  607.     default:

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

  609.         return -1;

  610.     }

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

  612. 

  613.     s->picture_number=0;

  614.     

  615.     return 0;

  616. }

  617. 

  618. 

  619. static void clear_state(FFV1Context *f){

  620.     int i, j;

  621. 

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

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

  624. 

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

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

  627.         

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

  629.             if(f->ac){

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

  631.             }else{

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

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

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

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

  636.             }

  637.         }

  638.     }

  639. }

  640. 

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

  642.     FFV1Context *f = avctx->priv_data;

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

  644.     AVFrame *pict = data;

  645.     const int width= f->width;

  646.     const int height= f->height;

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

  648.     int used_count= 0;

  649.     uint8_t keystate=128;

  650. 

  651.     ff_init_range_encoder(c, buf, buf_size);

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

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

  654. 

  655.     *p = *pict;

  656.     p->pict_type= FF_I_TYPE;

  657.     

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

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

  660.         p->key_frame= 1;

  661.         write_header(f);

  662.         clear_state(f);

  663.     }else{

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

  665.         p->key_frame= 0;

  666.     }

  667. 

  668.     if(!f->ac){

  669.         used_count += ff_rac_terminate(c);

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

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

  672.     }

  673.     

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

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

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

  677. 

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

  679. 

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

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

  682.     }else{

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

  684.     }

  685.     emms_c();

  686.     

  687.     f->picture_number++;

  688. 

  689.     if(f->ac){

  690.         return ff_rac_terminate(c);

  691.     }else{

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

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

  694.     }

  695. }

  696. 

  697. static void common_end(FFV1Context *s){

  698.     int i; 

  699. 

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

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

  702. 

  703.         av_freep(&p->state);

  704.     }

  705. }

  706. 

  707. static int encode_end(AVCodecContext *avctx)

  708. {

  709.     FFV1Context *s = avctx->priv_data;

  710. 

  711.     common_end(s);

  712. 

  713.     return 0;

  714. }

  715. 

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

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

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

  719.     int x;

  720.     int run_count=0;

  721.     int run_mode=0;

  722.     int run_index= s->run_index;

  723. 

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

  725.         int diff, context, sign;

  726.          

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

  728.         if(context < 0){

  729.             context= -context;

  730.             sign=1;

  731.         }else

  732.             sign=0;

  733.         

  734. 

  735.         if(s->ac){

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

  737.         }else{

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

  739.             

  740.             if(run_mode){

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

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

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

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

  745.                     }else{

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

  747.                         else run_count=0;

  748.                         if(run_index) run_index--;

  749.                         run_mode=2;

  750.                     }

  751.                 }

  752.                 run_count--;

  753.                 if(run_count < 0){

  754.                     run_mode=0;

  755.                     run_count=0;

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

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

  758.                 }else

  759.                     diff=0;

  760.             }else

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

  762.             

  763. //            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));

  764.         }

  765. 

  766.         if(sign) diff= -diff;

  767. 

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

  769.     }

  770.     s->run_index= run_index;        

  771. }

  772. 

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

  774.     int x, y;

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

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

  777. 

  778.     s->run_index=0;

  779.     

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

  781.     

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

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

  784. 

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

  786.         sample[1]= temp;

  787. 

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

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

  790.         

  791. //{START_TIMER

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

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

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

  795.         }

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

  797.     }

  798. }

  799. 

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

  801.     int x, y, p;

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

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

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

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

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

  807. 

  808.     s->run_index=0;

  809.     

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

  811.     

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

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

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

  815. 

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

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

  818. 

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

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

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

  822.         }

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

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

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

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

  827. 

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

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

  830.             

  831.             b -= 0x100;

  832.             r -= 0x100;

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

  834.             b += g;

  835.             r += g;

  836.             

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

  838.         }

  839.     }

  840. }

  841. 

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

  843.     int v;

  844.     int i=0;

  845.     uint8_t state[CONTEXT_SIZE];

  846. 

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

  848. 

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

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

  851. 

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

  853.         

  854.         while(len--){

  855.             quant_table[i] = scale*v;

  856.             i++;

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

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

  859.         }

  860.     }

  861. 

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

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

  864.     }

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

  866.     

  867.     return 2*v - 1;

  868. }

  869. 

  870. static int read_header(FFV1Context *f){

  871.     uint8_t state[CONTEXT_SIZE];

  872.     int i, context_count;

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

  874.     

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

  876. 

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

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

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

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

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

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

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

  884.     f->plane_count= 2;

  885. 

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

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

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

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

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

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

  892.         case 0x22: f->avctx->pix_fmt= PIX_FMT_YUV410P; break;

  893.         default:

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

  895.             return -1;

  896.         }

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

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

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

  900.             return -1;

  901.         }

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

  903.     }else{

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

  905.         return -1;

  906.     }

  907. 

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

  909. 

  910.     context_count=1;

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

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

  913.         if(context_count < 0 || context_count > 32768){

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

  915.             return -1;

  916.         }

  917.     }

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

  919.     

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

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

  922. 

  923.         p->context_count= context_count;

  924. 

  925.         if(f->ac){

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

  927.         }else{

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

  929.         }

  930.     }

  931.     

  932.     return 0;

  933. }

  934. 

  935. static int decode_init(AVCodecContext *avctx)

  936. {

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

  938. 

  939.     common_init(avctx);

  940.     

  941.     return 0;

  942. }

  943. 

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

  945.     FFV1Context *f = avctx->priv_data;

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

  947.     const int width= f->width;

  948.     const int height= f->height;

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

  950.     int bytes_read;

  951.     uint8_t keystate= 128;

  952. 

  953.     AVFrame *picture = data;

  954. 

  955.     ff_init_range_decoder(c, buf, buf_size);

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

  957. 

  958. 

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

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

  961.         p->key_frame= 1;

  962.         read_header(f);

  963.         clear_state(f);

  964.     }else{

  965.         p->key_frame= 0;

  966.     }

  967. 

  968.     p->reference= 0;

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

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

  971.         return -1;

  972.     }

  973. 

  974.     if(avctx->debug&FF_DEBUG_PICT_INFO)

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

  976.     

  977.     if(!f->ac){

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

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

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

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

  982.     } else {

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

  984.     }

  985.     

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

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

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

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

  990.         

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

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

  993.     }else{

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

  995.     }

  996.         

  997.     emms_c();

  998. 

  999.     f->picture_number++;

  1000. 

  1001.     *picture= *p;

  1002.     

  1003.     avctx->release_buffer(avctx, p); //FIXME

  1004. 

  1005.     *data_size = sizeof(AVFrame);

  1006.     

  1007.     if(f->ac){

  1008.         bytes_read= c->bytestream - c->bytestream_start - 1;

  1009.         if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of frame\n");

  1010.     }else{

  1011.         bytes_read+= (get_bits_count(&f->gb)+7)/8;

  1012.     }

  1013. 

  1014.     return bytes_read;

  1015. }

  1016. 

  1017. AVCodec ffv1_decoder = {

  1018.     "ffv1",

  1019.     CODEC_TYPE_VIDEO,

  1020.     CODEC_ID_FFV1,

  1021.     sizeof(FFV1Context),

  1022.     decode_init,

  1023.     NULL,

  1024.     NULL,

  1025.     decode_frame,

  1026.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1027.     NULL

  1028. };

  1029. 

  1030. #ifdef CONFIG_ENCODERS

  1031. AVCodec ffv1_encoder = {

  1032.     "ffv1",

  1033.     CODEC_TYPE_VIDEO,

  1034.     CODEC_ID_FFV1,

  1035.     sizeof(FFV1Context),

  1036.     encode_init,

  1037.     encode_frame,

  1038.     encode_end,

  1039. };

  1040. #endif