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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 file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

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

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

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file libavcodec/ffv1.c

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

  26.  */

  27. 

  28. #include "avcodec.h"

  29. #include "get_bits.h"

  30. #include "put_bits.h"

  31. #include "dsputil.h"

  32. #include "rangecoder.h"

  33. #include "golomb.h"

  34. #include "mathops.h"

  35. 

  36. #define MAX_PLANES 4

  37. #define CONTEXT_SIZE 32

  38. 

  39. extern const uint8_t ff_log2_run[32];

  40. 

  41. static const int8_t quant3[256]={

  42.  0, 0, 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,-1,

  54. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  55. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  56. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  57. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0,

  58. };

  59. static const int8_t quant5[256]={

  60.  0, 1, 1, 1, 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,-2,-2,-2,

  72. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  73. -2,-2,-2,-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,-2,-2,-2,-2,-2,-1,-1,-1,

  76. };

  77. static const int8_t quant7[256]={

  78.  0, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  79.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  80.  2, 2, 2, 2, 2, 2, 2, 2, 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,-3,-3,-3,-3,-3,-3,-3,

  88. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  89. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  90. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  91. -3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,

  92. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  93. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,

  94. };

  95. static const int8_t quant9[256]={

  96.  0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  97.  3, 3, 3, 3, 3, 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,-4,-4,-4,-4,

  107. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  108. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  109. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  110. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,

  111. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-1,-1,

  112. };

  113. static const int8_t quant11[256]={

  114.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

  115.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  116.  4, 4, 4, 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,-5,-5,

  124. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  125. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  126. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  127. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-4,-4,

  128. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  129. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  130. };

  131. static const int8_t quant13[256]={

  132.  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  133.  4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  134.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  135.  5, 5, 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,-6,

  141. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  142. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  143. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  144. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-5,

  145. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  146. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  147. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,

  148. };

  149. 

  150. typedef struct VlcState{

  151.     int16_t drift;

  152.     uint16_t error_sum;

  153.     int8_t bias;

  154.     uint8_t count;

  155. } VlcState;

  156. 

  157. typedef struct PlaneContext{

  158.     int context_count;

  159.     uint8_t (*state)[CONTEXT_SIZE];

  160.     VlcState *vlc_state;

  161.     uint8_t interlace_bit_state[2];

  162. } PlaneContext;

  163. 

  164. typedef struct FFV1Context{

  165.     AVCodecContext *avctx;

  166.     RangeCoder c;

  167.     GetBitContext gb;

  168.     PutBitContext pb;

  169.     int version;

  170.     int width, height;

  171.     int chroma_h_shift, chroma_v_shift;

  172.     int flags;

  173.     int picture_number;

  174.     AVFrame picture;

  175.     int plane_count;

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

  177.     PlaneContext plane[MAX_PLANES];

  178.     int16_t quant_table[5][256];

  179.     int run_index;

  180.     int colorspace;

  181. 

  182.     DSPContext dsp;

  183. }FFV1Context;

  184. 

  185. static av_always_inline int fold(int diff, int bits){

  186.     if(bits==8)

  187.         diff= (int8_t)diff;

  188.     else{

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

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

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

  192.     }

  193. 

  194.     return diff;

  195. }

  196. 

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

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

  199.     const int  T= last[ 0];

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

  201. 

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

  203. }

  204. 

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

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

  207.     const int  T= last[ 0];

  208.     const int RT= last[ 1];

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

  210. 

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

  212.         const int TT= last2[0];

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

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

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

  216.     }else

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

  218. }

  219. 

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

  221.     int i;

  222. 

  223.     if(v){

  224.         const int a= FFABS(v);

  225.         const int e= av_log2(a);

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

  227. 

  228.         assert(e<=9);

  229. 

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

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

  232.         }

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

  234. 

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

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

  237.         }

  238. 

  239.         if(is_signed)

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

  241.     }else{

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

  243.     }

  244. }

  245. 

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

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

  248.         return 0;

  249.     else{

  250.         int i, e, a;

  251.         e= 0;

  252.         while(get_rac(c, state+1 + e) && e<9){ //1..10

  253.             e++;

  254.         }

  255. 

  256.         a= 1;

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

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

  259.         }

  260. 

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

  262.             return -a;

  263.         else

  264.             return a;

  265.     }

  266. }

  267. 

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

  269.     int drift= state->drift;

  270.     int count= state->count;

  271.     state->error_sum += FFABS(v);

  272.     drift += v;

  273. 

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

  275.         count >>= 1;

  276.         drift >>= 1;

  277.         state->error_sum >>= 1;

  278.     }

  279.     count++;

  280. 

  281.     if(drift <= -count){

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

  283. 

  284.         drift += count;

  285.         if(drift <= -count)

  286.             drift= -count + 1;

  287.     }else if(drift > 0){

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

  289. 

  290.         drift -= count;

  291.         if(drift > 0)

  292.             drift= 0;

  293.     }

  294. 

  295.     state->drift= drift;

  296.     state->count= count;

  297. }

  298. 

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

  300.     int i, k, code;

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

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

  303. 

  304.     i= state->count;

  305.     k=0;

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

  307.         k++;

  308.         i += i;

  309.     }

  310. 

  311.     assert(k<=8);

  312. 

  313. #if 0 // JPEG LS

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

  315.     else                                         code= v;

  316. #else

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

  318. #endif

  319. 

  320. //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);

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

  322. 

  323.     update_vlc_state(state, v);

  324. }

  325. 

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

  327.     int k, i, v, ret;

  328. 

  329.     i= state->count;

  330.     k=0;

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

  332.         k++;

  333.         i += i;

  334.     }

  335. 

  336.     assert(k<=8);

  337. 

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

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

  340. 

  341. #if 0 // JPEG LS

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

  343. #else

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

  345. #endif

  346. 

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

  348. 

  349.     update_vlc_state(state, v);

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

  351.     return ret;

  352. }

  353. 

  354. #if CONFIG_FFV1_ENCODER

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

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

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

  358.     int x;

  359.     int run_index= s->run_index;

  360.     int run_count=0;

  361.     int run_mode=0;

  362. 

  363.     if(s->ac){

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

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

  366.             return -1;

  367.         }

  368.     }else{

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

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

  371.             return -1;

  372.         }

  373.     }

  374. 

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

  376.         int diff, context;

  377. 

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

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

  380. 

  381.         if(context < 0){

  382.             context = -context;

  383.             diff= -diff;

  384.         }

  385. 

  386.         diff= fold(diff, bits);

  387. 

  388.         if(s->ac){

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

  390.         }else{

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

  392. 

  393.             if(run_mode){

  394. 

  395.                 if(diff){

  396.                     while(run_count >= 1<<ff_log2_run[run_index]){

  397.                         run_count -= 1<<ff_log2_run[run_index];

  398.                         run_index++;

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

  400.                     }

  401. 

  402.                     put_bits(&s->pb, 1 + ff_log2_run[run_index], run_count);

  403.                     if(run_index) run_index--;

  404.                     run_count=0;

  405.                     run_mode=0;

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

  407.                 }else{

  408.                     run_count++;

  409.                 }

  410.             }

  411. 

  412. //            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));

  413. 

  414.             if(run_mode == 0)

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

  416.         }

  417.     }

  418.     if(run_mode){

  419.         while(run_count >= 1<<ff_log2_run[run_index]){

  420.             run_count -= 1<<ff_log2_run[run_index];

  421.             run_index++;

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

  423.         }

  424. 

  425.         if(run_count)

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

  427.     }

  428.     s->run_index= run_index;

  429. 

  430.     return 0;

  431. }

  432. 

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

  434.     int x,y,i;

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

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

  437.     s->run_index=0;

  438. 

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

  440. 

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

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

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

  444. 

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

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

  447. //{START_TIMER

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

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

  450.         }

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

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

  453.     }

  454. }

  455. 

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

  457.     int x, y, p, i;

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

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

  460.     s->run_index=0;

  461. 

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

  463. 

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

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

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

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

  468. 

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

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

  471.             int b= v&0xFF;

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

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

  474. 

  475.             b -= g;

  476.             r -= g;

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

  478.             b += 0x100;

  479.             r += 0x100;

  480. 

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

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

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

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

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

  486.         }

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

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

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

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

  491.         }

  492.     }

  493. }

  494. 

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

  496.     int last=0;

  497.     int i;

  498.     uint8_t state[CONTEXT_SIZE];

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

  500. 

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

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

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

  504.             last= i;

  505.         }

  506.     }

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

  508. }

  509. 

  510. static void write_header(FFV1Context *f){

  511.     uint8_t state[CONTEXT_SIZE];

  512.     int i;

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

  514. 

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

  516. 

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

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

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

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

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

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

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

  524. 

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

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

  527. }

  528. #endif /* CONFIG_FFV1_ENCODER */

  529. 

  530. static av_cold int common_init(AVCodecContext *avctx){

  531.     FFV1Context *s = avctx->priv_data;

  532. 

  533.     s->avctx= avctx;

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

  535. 

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

  537. 

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

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

  540. 

  541.     assert(s->width && s->height);

  542. 

  543.     return 0;

  544. }

  545. 

  546. #if CONFIG_FFV1_ENCODER

  547. static av_cold int encode_init(AVCodecContext *avctx)

  548. {

  549.     FFV1Context *s = avctx->priv_data;

  550.     int i;

  551. 

  552.     common_init(avctx);

  553. 

  554.     s->version=0;

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

  556. 

  557.     s->plane_count=2;

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

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

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

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

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

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

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

  565.         }else{

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

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

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

  569.         }

  570.     }

  571. 

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

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

  574. 

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

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

  577.         }else{

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

  579.         }

  580. 

  581.         if(s->ac){

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

  583.         }else{

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

  585.         }

  586.     }

  587. 

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

  589.     switch(avctx->pix_fmt){

  590.     case PIX_FMT_YUV444P:

  591.     case PIX_FMT_YUV422P:

  592.     case PIX_FMT_YUV420P:

  593.     case PIX_FMT_YUV411P:

  594.     case PIX_FMT_YUV410P:

  595.         s->colorspace= 0;

  596.         break;

  597.     case PIX_FMT_RGB32:

  598.         s->colorspace= 1;

  599.         break;

  600.     default:

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

  602.         return -1;

  603.     }

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

  605. 

  606.     s->picture_number=0;

  607. 

  608.     return 0;

  609. }

  610. #endif /* CONFIG_FFV1_ENCODER */

  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. #if CONFIG_FFV1_ENCODER

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

  637.     FFV1Context *f = avctx->priv_data;

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

  639.     AVFrame *pict = data;

  640.     const int width= f->width;

  641.     const int height= f->height;

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

  643.     int used_count= 0;

  644.     uint8_t keystate=128;

  645. 

  646.     ff_init_range_encoder(c, buf, buf_size);

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

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

  649. 

  650.     *p = *pict;

  651.     p->pict_type= FF_I_TYPE;

  652. 

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

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

  655.         p->key_frame= 1;

  656.         write_header(f);

  657.         clear_state(f);

  658.     }else{

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

  660.         p->key_frame= 0;

  661.     }

  662. 

  663.     if(!f->ac){

  664.         used_count += ff_rac_terminate(c);

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

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

  667.     }

  668. 

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

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

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

  672. 

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

  674. 

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

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

  677.     }else{

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

  679.     }

  680.     emms_c();

  681. 

  682.     f->picture_number++;

  683. 

  684.     if(f->ac){

  685.         return ff_rac_terminate(c);

  686.     }else{

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

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

  689.     }

  690. }

  691. #endif /* CONFIG_FFV1_ENCODER */

  692. 

  693. static av_cold int common_end(AVCodecContext *avctx){

  694.     FFV1Context *s = avctx->priv_data;

  695.     int i;

  696. 

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

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

  699. 

  700.         av_freep(&p->state);

  701.         av_freep(&p->vlc_state);

  702.     }

  703. 

  704.     return 0;

  705. }

  706. 

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

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

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

  710.     int x;

  711.     int run_count=0;

  712.     int run_mode=0;

  713.     int run_index= s->run_index;

  714. 

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

  716.         int diff, context, sign;

  717. 

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

  719.         if(context < 0){

  720.             context= -context;

  721.             sign=1;

  722.         }else

  723.             sign=0;

  724. 

  725. 

  726.         if(s->ac){

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

  728.         }else{

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

  730. 

  731.             if(run_mode){

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

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

  734.                         run_count = 1<<ff_log2_run[run_index];

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

  736.                     }else{

  737.                         if(ff_log2_run[run_index]) run_count = get_bits(&s->gb, ff_log2_run[run_index]);

  738.                         else run_count=0;

  739.                         if(run_index) run_index--;

  740.                         run_mode=2;

  741.                     }

  742.                 }

  743.                 run_count--;

  744.                 if(run_count < 0){

  745.                     run_mode=0;

  746.                     run_count=0;

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

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

  749.                 }else

  750.                     diff=0;

  751.             }else

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

  753. 

  754. //            printf("count:%d index:%d, mode:%d, x:%d y:%d pos:%d\n", run_count, run_index, run_mode, x, y, get_bits_count(&s->gb));

  755.         }

  756. 

  757.         if(sign) diff= -diff;

  758. 

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

  760.     }

  761.     s->run_index= run_index;

  762. }

  763. 

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

  765.     int x, y;

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

  767.     int_fast16_t *sample[2];

  768.     sample[0]=sample_buffer[0]+3;

  769.     sample[1]=sample_buffer[1]+3;

  770. 

  771.     s->run_index=0;

  772. 

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

  774. 

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

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

  777. 

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

  779.         sample[1]= temp;

  780. 

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

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

  783. 

  784. //{START_TIMER

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

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

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

  788.         }

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

  790.     }

  791. }

  792. 

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

  794.     int x, y, p;

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

  796.     int_fast16_t *sample[3][2];

  797.     for(x=0; x<3; x++){

  798.         sample[x][0] = sample_buffer[x][0]+3;

  799.         sample[x][1] = sample_buffer[x][1]+3;

  800.     }

  801. 

  802.     s->run_index=0;

  803. 

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

  805. 

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

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

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

  809. 

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

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

  812. 

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

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

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

  816.         }

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

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

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

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

  821. 

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

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

  824. 

  825.             b -= 0x100;

  826.             r -= 0x100;

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

  828.             b += g;

  829.             r += g;

  830. 

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

  832.         }

  833.     }

  834. }

  835. 

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

  837.     int v;

  838.     int i=0;

  839.     uint8_t state[CONTEXT_SIZE];

  840. 

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

  842. 

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

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

  845. 

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

  847. 

  848.         while(len--){

  849.             quant_table[i] = scale*v;

  850.             i++;

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

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

  853.         }

  854.     }

  855. 

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

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

  858.     }

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

  860. 

  861.     return 2*v - 1;

  862. }

  863. 

  864. static int read_header(FFV1Context *f){

  865.     uint8_t state[CONTEXT_SIZE];

  866.     int i, context_count;

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

  868. 

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

  870. 

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

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

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

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

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

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

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

  878.     f->plane_count= 2;

  879. 

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

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

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

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

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

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

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

  887.         default:

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

  889.             return -1;

  890.         }

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

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

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

  894.             return -1;

  895.         }

  896.         f->avctx->pix_fmt= PIX_FMT_RGB32;

  897.     }else{

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

  899.         return -1;

  900.     }

  901. 

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

  903. 

  904.     context_count=1;

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

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

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

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

  909.             return -1;

  910.         }

  911.     }

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

  913. 

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

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

  916. 

  917.         p->context_count= context_count;

  918. 

  919.         if(f->ac){

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

  921.         }else{

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

  923.         }

  924.     }

  925. 

  926.     return 0;

  927. }

  928. 

  929. static av_cold int decode_init(AVCodecContext *avctx)

  930. {

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

  932. 

  933.     common_init(avctx);

  934. 

  935.     return 0;

  936. }

  937. 

  938. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  939.     const uint8_t *buf = avpkt->data;

  940.     int buf_size = avpkt->size;

  941.     FFV1Context *f = avctx->priv_data;

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

  943.     const int width= f->width;

  944.     const int height= f->height;

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

  946.     int bytes_read;

  947.     uint8_t keystate= 128;

  948. 

  949.     AVFrame *picture = data;

  950. 

  951.     ff_init_range_decoder(c, buf, buf_size);

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

  953. 

  954. 

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

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

  957.         p->key_frame= 1;

  958.         if(read_header(f) < 0)

  959.             return -1;

  960.         clear_state(f);

  961.     }else{

  962.         p->key_frame= 0;

  963.     }

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

  965.         return -1;

  966. 

  967.     p->reference= 0;

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

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

  970.         return -1;

  971.     }

  972. 

  973.     if(avctx->debug&FF_DEBUG_PICT_INFO)

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

  975. 

  976.     if(!f->ac){

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

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

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

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

  981.     } else {

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

  983.     }

  984. 

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

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

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

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

  989. 

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

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

  992.     }else{

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

  994.     }

  995. 

  996.     emms_c();

  997. 

  998.     f->picture_number++;

  999. 

  1000.     *picture= *p;

  1001. 

  1002.     avctx->release_buffer(avctx, p); //FIXME

  1003. 

  1004.     *data_size = sizeof(AVFrame);

  1005. 

  1006.     if(f->ac){

  1007.         bytes_read= c->bytestream - c->bytestream_start - 1;

  1008.         if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of frame\n");

  1009.     }else{

  1010.         bytes_read+= (get_bits_count(&f->gb)+7)/8;

  1011.     }

  1012. 

  1013.     return bytes_read;

  1014. }

  1015. 

  1016. AVCodec ffv1_decoder = {

  1017.     "ffv1",

  1018.     CODEC_TYPE_VIDEO,

  1019.     CODEC_ID_FFV1,

  1020.     sizeof(FFV1Context),

  1021.     decode_init,

  1022.     NULL,

  1023.     common_end,

  1024.     decode_frame,

  1025.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1026.     NULL,

  1027.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg codec #1"),

  1028. };

  1029. 

  1030. #if CONFIG_FFV1_ENCODER

  1031. AVCodec ffv1_encoder = {

  1032.     "ffv1",

  1033.     CODEC_TYPE_VIDEO,

  1034.     CODEC_ID_FFV1,

  1035.     sizeof(FFV1Context),

  1036.     encode_init,

  1037.     encode_frame,

  1038.     common_end,

  1039.     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_RGB32, PIX_FMT_NONE},

  1040.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg codec #1"),

  1041. };

  1042. #endif