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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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.     common_init(avctx);

  554. 

  555.     s->version=0;

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

  557. 

  558.     s->plane_count=2;

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

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

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

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

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

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

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

  566.         }else{

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

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

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

  570.         }

  571.     }

  572. 

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

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

  575. 

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

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

  578.         }else{

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

  580.         }

  581. 

  582.         if(s->ac){

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

  584.         }else{

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

  586.         }

  587.     }

  588. 

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

  590.     switch(avctx->pix_fmt){

  591.     case PIX_FMT_YUV444P:

  592.     case PIX_FMT_YUV422P:

  593.     case PIX_FMT_YUV420P:

  594.     case PIX_FMT_YUV411P:

  595.     case PIX_FMT_YUV410P:

  596.         s->colorspace= 0;

  597.         break;

  598.     case PIX_FMT_RGBA32:

  599.         s->colorspace= 1;

  600.         break;

  601.     default:

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

  603.         return -1;

  604.     }

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

  606. 

  607.     s->picture_number=0;

  608. 

  609.     return 0;

  610. }

  611. 

  612. 

  613. static void clear_state(FFV1Context *f){

  614.     int i, j;

  615. 

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

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

  618. 

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

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

  621. 

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

  623.             if(f->ac){

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

  625.             }else{

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

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

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

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

  630.             }

  631.         }

  632.     }

  633. }

  634. 

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

  636.     FFV1Context *f = avctx->priv_data;

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

  638.     AVFrame *pict = data;

  639.     const int width= f->width;

  640.     const int height= f->height;

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

  642.     int used_count= 0;

  643.     uint8_t keystate=128;

  644. 

  645.     ff_init_range_encoder(c, buf, buf_size);

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

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

  648. 

  649.     *p = *pict;

  650.     p->pict_type= FF_I_TYPE;

  651. 

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

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

  654.         p->key_frame= 1;

  655.         write_header(f);

  656.         clear_state(f);

  657.     }else{

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

  659.         p->key_frame= 0;

  660.     }

  661. 

  662.     if(!f->ac){

  663.         used_count += ff_rac_terminate(c);

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

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

  666.     }

  667. 

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

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

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

  671. 

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

  673. 

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

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

  676.     }else{

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

  678.     }

  679.     emms_c();

  680. 

  681.     f->picture_number++;

  682. 

  683.     if(f->ac){

  684.         return ff_rac_terminate(c);

  685.     }else{

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

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

  688.     }

  689. }

  690. 

  691. static int common_end(AVCodecContext *avctx){

  692.     FFV1Context *s = avctx->priv_data;

  693.     int i;

  694. 

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

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

  697. 

  698.         av_freep(&p->state);

  699.     }

  700. 

  701.     return 0;

  702. }

  703. 

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

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

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

  707.     int x;

  708.     int run_count=0;

  709.     int run_mode=0;

  710.     int run_index= s->run_index;

  711. 

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

  713.         int diff, context, sign;

  714. 

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

  716.         if(context < 0){

  717.             context= -context;

  718.             sign=1;

  719.         }else

  720.             sign=0;

  721. 

  722. 

  723.         if(s->ac){

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

  725.         }else{

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

  727. 

  728.             if(run_mode){

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

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

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

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

  733.                     }else{

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

  735.                         else run_count=0;

  736.                         if(run_index) run_index--;

  737.                         run_mode=2;

  738.                     }

  739.                 }

  740.                 run_count--;

  741.                 if(run_count < 0){

  742.                     run_mode=0;

  743.                     run_count=0;

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

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

  746.                 }else

  747.                     diff=0;

  748.             }else

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

  750. 

  751. //            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));

  752.         }

  753. 

  754.         if(sign) diff= -diff;

  755. 

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

  757.     }

  758.     s->run_index= run_index;

  759. }

  760. 

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

  762.     int x, y;

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

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

  765. 

  766.     s->run_index=0;

  767. 

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

  769. 

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

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

  772. 

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

  774.         sample[1]= temp;

  775. 

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

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

  778. 

  779. //{START_TIMER

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

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

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

  783.         }

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

  785.     }

  786. }

  787. 

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

  789.     int x, y, p;

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

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

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

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

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

  795. 

  796.     s->run_index=0;

  797. 

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

  799. 

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

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

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

  803. 

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

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

  806. 

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

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

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

  810.         }

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

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

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

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

  815. 

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

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

  818. 

  819.             b -= 0x100;

  820.             r -= 0x100;

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

  822.             b += g;

  823.             r += g;

  824. 

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

  826.         }

  827.     }

  828. }

  829. 

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

  831.     int v;

  832.     int i=0;

  833.     uint8_t state[CONTEXT_SIZE];

  834. 

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

  836. 

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

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

  839. 

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

  841. 

  842.         while(len--){

  843.             quant_table[i] = scale*v;

  844.             i++;

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

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

  847.         }

  848.     }

  849. 

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

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

  852.     }

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

  854. 

  855.     return 2*v - 1;

  856. }

  857. 

  858. static int read_header(FFV1Context *f){

  859.     uint8_t state[CONTEXT_SIZE];

  860.     int i, context_count;

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

  862. 

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

  864. 

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

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

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

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

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

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

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

  872.     f->plane_count= 2;

  873. 

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

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

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

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

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

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

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

  881.         default:

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

  883.             return -1;

  884.         }

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

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

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

  888.             return -1;

  889.         }

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

  891.     }else{

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

  893.         return -1;

  894.     }

  895. 

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

  897. 

  898.     context_count=1;

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

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

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

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

  903.             return -1;

  904.         }

  905.     }

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

  907. 

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

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

  910. 

  911.         p->context_count= context_count;

  912. 

  913.         if(f->ac){

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

  915.         }else{

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

  917.         }

  918.     }

  919. 

  920.     return 0;

  921. }

  922. 

  923. static int decode_init(AVCodecContext *avctx)

  924. {

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

  926. 

  927.     common_init(avctx);

  928. 

  929.     return 0;

  930. }

  931. 

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

  933.     FFV1Context *f = avctx->priv_data;

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

  935.     const int width= f->width;

  936.     const int height= f->height;

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

  938.     int bytes_read;

  939.     uint8_t keystate= 128;

  940. 

  941.     AVFrame *picture = data;

  942. 

  943.     ff_init_range_decoder(c, buf, buf_size);

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

  945. 

  946. 

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

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

  949.         p->key_frame= 1;

  950.         if(read_header(f) < 0)

  951.             return -1;

  952.         clear_state(f);

  953.     }else{

  954.         p->key_frame= 0;

  955.     }

  956.     if(!f->plane[0].state && !f->plane[0].vlc_state)

  957.         return -1;

  958. 

  959.     p->reference= 0;

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

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

  962.         return -1;

  963.     }

  964. 

  965.     if(avctx->debug&FF_DEBUG_PICT_INFO)

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

  967. 

  968.     if(!f->ac){

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

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

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

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

  973.     } else {

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

  975.     }

  976. 

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

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

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

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

  981. 

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

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

  984.     }else{

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

  986.     }

  987. 

  988.     emms_c();

  989. 

  990.     f->picture_number++;

  991. 

  992.     *picture= *p;

  993. 

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

  995. 

  996.     *data_size = sizeof(AVFrame);

  997. 

  998.     if(f->ac){

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

  1000.         if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of frame\n");

  1001.     }else{

  1002.         bytes_read+= (get_bits_count(&f->gb)+7)/8;

  1003.     }

  1004. 

  1005.     return bytes_read;

  1006. }

  1007. 

  1008. AVCodec ffv1_decoder = {

  1009.     "ffv1",

  1010.     CODEC_TYPE_VIDEO,

  1011.     CODEC_ID_FFV1,

  1012.     sizeof(FFV1Context),

  1013.     decode_init,

  1014.     NULL,

  1015.     common_end,

  1016.     decode_frame,

  1017.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1018.     NULL

  1019. };

  1020. 

  1021. #ifdef CONFIG_ENCODERS

  1022. AVCodec ffv1_encoder = {

  1023.     "ffv1",

  1024.     CODEC_TYPE_VIDEO,

  1025.     CODEC_ID_FFV1,

  1026.     sizeof(FFV1Context),

  1027.     encode_init,

  1028.     encode_frame,

  1029.     common_end,

  1030. };

  1031. #endif