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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. /**

  25.  * @file ffv1.c

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

  27.  */

  28. 

  29. #include "common.h"

  30. #include "bitstream.h"

  31. #include "avcodec.h"

  32. #include "dsputil.h"

  33. #include "rangecoder.h"

  34. #include "golomb.h"

  35. 

  36. #define MAX_PLANES 4

  37. #define CONTEXT_SIZE 32

  38. 

  39. static const int8_t quant3[256]={

  40.  0, 0, 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,-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, 0,

  56. };

  57. static const int8_t quant5[256]={

  58.  0, 1, 1, 1, 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,-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,-1,-1,-1,

  74. };

  75. static const int8_t quant7[256]={

  76.  0, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  77.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  78.  2, 2, 2, 2, 2, 2, 2, 2, 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,-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,-2,-2,-2,-2,-2,-2,-2,

  90. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  91. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,

  92. };

  93. static const int8_t quant9[256]={

  94.  0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  95.  3, 3, 3, 3, 3, 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,-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,-3,-3,-3,-3,

  109. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-1,-1,

  110. };

  111. static const int8_t quant11[256]={

  112.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

  113.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  114.  4, 4, 4, 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,-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,-4,-4,

  126. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  127. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  128. };

  129. static const int8_t quant13[256]={

  130.  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  131.  4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  132.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  133.  5, 5, 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,-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,-5,

  143. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

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

  145. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,

  146. };

  147. 

  148. static const uint8_t log2_run[32]={

  149.  0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,

  150.  4, 4, 5, 5, 6, 6, 7, 7,

  151.  8, 9,10,11,12,13,14,15,

  152. };

  153. 

  154. typedef struct VlcState{

  155.     int16_t drift;

  156.     uint16_t error_sum;

  157.     int8_t bias;

  158.     uint8_t count;

  159. } VlcState;

  160. 

  161. typedef struct PlaneContext{

  162.     int context_count;

  163.     uint8_t (*state)[CONTEXT_SIZE];

  164.     VlcState *vlc_state;

  165.     uint8_t interlace_bit_state[2];

  166. } PlaneContext;

  167. 

  168. typedef struct FFV1Context{

  169.     AVCodecContext *avctx;

  170.     RangeCoder c;

  171.     GetBitContext gb;

  172.     PutBitContext pb;

  173.     int version;

  174.     int width, height;

  175.     int chroma_h_shift, chroma_v_shift;

  176.     int flags;

  177.     int picture_number;

  178.     AVFrame picture;

  179.     int plane_count;

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

  181.     PlaneContext plane[MAX_PLANES];

  182.     int16_t quant_table[5][256];

  183.     int run_index;

  184.     int colorspace;

  185. 

  186.     DSPContext dsp;

  187. }FFV1Context;

  188. 

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

  190.     if(bits==8)

  191.         diff= (int8_t)diff;

  192.     else{

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

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

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

  196.     }

  197. 

  198.     return diff;

  199. }

  200. 

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

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

  203.     const int  T= last[ 0];

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

  205. 

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

  207. }

  208. 

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

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

  211.     const int  T= last[ 0];

  212.     const int RT= last[ 1];

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

  214. 

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

  216.         const int TT= last2[0];

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

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

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

  220.     }else

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

  222. }

  223. 

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

  225.     int i;

  226. 

  227.     if(v){

  228.         const int a= FFABS(v);

  229.         const int e= av_log2(a);

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

  231. 

  232.         assert(e<=9);

  233. 

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

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

  236.         }

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

  238. 

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

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

  241.         }

  242. 

  243.         if(is_signed)

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

  245.     }else{

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

  247.     }

  248. }

  249. 

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

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

  252.         return 0;

  253.     else{

  254.         int i, e, a;

  255.         e= 0;

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

  257.             e++;

  258.         }

  259.         assert(e<=9);

  260. 

  261.         a= 1;

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

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

  264.         }

  265. 

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

  267.             return -a;

  268.         else

  269.             return a;

  270.     }

  271. }

  272. 

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

  274.     int drift= state->drift;

  275.     int count= state->count;

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

  277.     drift += v;

  278. 

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

  280.         count >>= 1;

  281.         drift >>= 1;

  282.         state->error_sum >>= 1;

  283.     }

  284.     count++;

  285. 

  286.     if(drift <= -count){

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

  288. 

  289.         drift += count;

  290.         if(drift <= -count)

  291.             drift= -count + 1;

  292.     }else if(drift > 0){

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

  294. 

  295.         drift -= count;

  296.         if(drift > 0)

  297.             drift= 0;

  298.     }

  299. 

  300.     state->drift= drift;

  301.     state->count= count;

  302. }

  303. 

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

  305.     int i, k, code;

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

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

  308. 

  309.     i= state->count;

  310.     k=0;

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

  312.         k++;

  313.         i += i;

  314.     }

  315. 

  316.     assert(k<=8);

  317. 

  318. #if 0 // JPEG LS

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

  320.     else                                         code= v;

  321. #else

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

  323. #endif

  324. 

  325. //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);

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

  327. 

  328.     update_vlc_state(state, v);

  329. }

  330. 

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

  332.     int k, i, v, ret;

  333. 

  334.     i= state->count;

  335.     k=0;

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

  337.         k++;

  338.         i += i;

  339.     }

  340. 

  341.     assert(k<=8);

  342. 

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

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

  345. 

  346. #if 0 // JPEG LS

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

  348. #else

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

  350. #endif

  351. 

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

  353. 

  354.     update_vlc_state(state, v);

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

  356.     return ret;

  357. }

  358. 

  359. #ifdef CONFIG_ENCODERS

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

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

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

  363.     int x;

  364.     int run_index= s->run_index;

  365.     int run_count=0;

  366.     int run_mode=0;

  367. 

  368.     if(s->ac){

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

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

  371.             return -1;

  372.         }

  373.     }else{

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

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

  376.             return -1;

  377.         }

  378.     }

  379. 

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

  381.         int diff, context;

  382. 

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

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

  385. 

  386.         if(context < 0){

  387.             context = -context;

  388.             diff= -diff;

  389.         }

  390. 

  391.         diff= fold(diff, bits);

  392. 

  393.         if(s->ac){

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

  395.         }else{

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

  397. 

  398.             if(run_mode){

  399. 

  400.                 if(diff){

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

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

  403.                         run_index++;

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

  405.                     }

  406. 

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

  408.                     if(run_index) run_index--;

  409.                     run_count=0;

  410.                     run_mode=0;

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

  412.                 }else{

  413.                     run_count++;

  414.                 }

  415.             }

  416. 

  417. //            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));

  418. 

  419.             if(run_mode == 0)

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

  421.         }

  422.     }

  423.     if(run_mode){

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

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

  426.             run_index++;

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

  428.         }

  429. 

  430.         if(run_count)

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

  432.     }

  433.     s->run_index= run_index;

  434. 

  435.     return 0;

  436. }

  437. 

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

  439.     int x,y,i;

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

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

  442.     s->run_index=0;

  443. 

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

  445. 

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

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

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

  449. 

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

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

  452. //{START_TIMER

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

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

  455.         }

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

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

  458.     }

  459. }

  460. 

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

  462.     int x, y, p, i;

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

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

  465.     s->run_index=0;

  466. 

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

  468. 

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

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

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

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

  473. 

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

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

  476.             int b= v&0xFF;

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

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

  479. 

  480.             b -= g;

  481.             r -= g;

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

  483.             b += 0x100;

  484.             r += 0x100;

  485. 

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

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

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

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

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

  491.         }

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

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

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

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

  496.         }

  497.     }

  498. }

  499. 

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

  501.     int last=0;

  502.     int i;

  503.     uint8_t state[CONTEXT_SIZE];

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

  505. 

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

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

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

  509.             last= i;

  510.         }

  511.     }

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

  513. }

  514. 

  515. static void write_header(FFV1Context *f){

  516.     uint8_t state[CONTEXT_SIZE];

  517.     int i;

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

  519. 

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

  521. 

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

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

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

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

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

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

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

  529. 

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

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

  532. }

  533. #endif /* CONFIG_ENCODERS */

  534. 

  535. static int common_init(AVCodecContext *avctx){

  536.     FFV1Context *s = avctx->priv_data;

  537.     int width, height;

  538. 

  539.     s->avctx= avctx;

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

  541. 

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

  543. 

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

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

  546. 

  547.     assert(width && height);

  548. 

  549.     return 0;

  550. }

  551. 

  552. #ifdef CONFIG_ENCODERS

  553. static int encode_init(AVCodecContext *avctx)

  554. {

  555.     FFV1Context *s = avctx->priv_data;

  556.     int i;

  557. 

  558.     common_init(avctx);

  559. 

  560.     s->version=0;

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

  562. 

  563.     s->plane_count=2;

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

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

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

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

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

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

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

  571.         }else{

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

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

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

  575.         }

  576.     }

  577. 

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

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

  580. 

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

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

  583.         }else{

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

  585.         }

  586. 

  587.         if(s->ac){

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

  589.         }else{

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

  591.         }

  592.     }

  593. 

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

  595.     switch(avctx->pix_fmt){

  596.     case PIX_FMT_YUV444P:

  597.     case PIX_FMT_YUV422P:

  598.     case PIX_FMT_YUV420P:

  599.     case PIX_FMT_YUV411P:

  600.     case PIX_FMT_YUV410P:

  601.         s->colorspace= 0;

  602.         break;

  603.     case PIX_FMT_RGB32:

  604.         s->colorspace= 1;

  605.         break;

  606.     default:

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

  608.         return -1;

  609.     }

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

  611. 

  612.     s->picture_number=0;

  613. 

  614.     return 0;

  615. }

  616. #endif /* CONFIG_ENCODERS */

  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. #ifdef CONFIG_ENCODERS

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

  643.     FFV1Context *f = avctx->priv_data;

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

  645.     AVFrame *pict = data;

  646.     const int width= f->width;

  647.     const int height= f->height;

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

  649.     int used_count= 0;

  650.     uint8_t keystate=128;

  651. 

  652.     ff_init_range_encoder(c, buf, buf_size);

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

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

  655. 

  656.     *p = *pict;

  657.     p->pict_type= FF_I_TYPE;

  658. 

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

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

  661.         p->key_frame= 1;

  662.         write_header(f);

  663.         clear_state(f);

  664.     }else{

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

  666.         p->key_frame= 0;

  667.     }

  668. 

  669.     if(!f->ac){

  670.         used_count += ff_rac_terminate(c);

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

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

  673.     }

  674. 

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

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

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

  678. 

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

  680. 

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

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

  683.     }else{

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

  685.     }

  686.     emms_c();

  687. 

  688.     f->picture_number++;

  689. 

  690.     if(f->ac){

  691.         return ff_rac_terminate(c);

  692.     }else{

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

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

  695.     }

  696. }

  697. #endif /* CONFIG_ENCODERS */

  698. 

  699. static int common_end(AVCodecContext *avctx){

  700.     FFV1Context *s = avctx->priv_data;

  701.     int i;

  702. 

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

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

  705. 

  706.         av_freep(&p->state);

  707.     }

  708. 

  709.     return 0;

  710. }

  711. 

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

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

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

  715.     int x;

  716.     int run_count=0;

  717.     int run_mode=0;

  718.     int run_index= s->run_index;

  719. 

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

  721.         int diff, context, sign;

  722. 

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

  724.         if(context < 0){

  725.             context= -context;

  726.             sign=1;

  727.         }else

  728.             sign=0;

  729. 

  730. 

  731.         if(s->ac){

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

  733.         }else{

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

  735. 

  736.             if(run_mode){

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

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

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

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

  741.                     }else{

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

  743.                         else run_count=0;

  744.                         if(run_index) run_index--;

  745.                         run_mode=2;

  746.                     }

  747.                 }

  748.                 run_count--;

  749.                 if(run_count < 0){

  750.                     run_mode=0;

  751.                     run_count=0;

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

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

  754.                 }else

  755.                     diff=0;

  756.             }else

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

  758. 

  759. //            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));

  760.         }

  761. 

  762.         if(sign) diff= -diff;

  763. 

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

  765.     }

  766.     s->run_index= run_index;

  767. }

  768. 

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

  770.     int x, y;

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

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

  773. 

  774.     s->run_index=0;

  775. 

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

  777. 

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

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

  780. 

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

  782.         sample[1]= temp;

  783. 

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

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

  786. 

  787. //{START_TIMER

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

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

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

  791.         }

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

  793.     }

  794. }

  795. 

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

  797.     int x, y, p;

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

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

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

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

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

  803. 

  804.     s->run_index=0;

  805. 

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

  807. 

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

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

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

  811. 

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

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

  814. 

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

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

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

  818.         }

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

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

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

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

  823. 

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

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

  826. 

  827.             b -= 0x100;

  828.             r -= 0x100;

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

  830.             b += g;

  831.             r += g;

  832. 

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

  834.         }

  835.     }

  836. }

  837. 

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

  839.     int v;

  840.     int i=0;

  841.     uint8_t state[CONTEXT_SIZE];

  842. 

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

  844. 

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

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

  847. 

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

  849. 

  850.         while(len--){

  851.             quant_table[i] = scale*v;

  852.             i++;

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

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

  855.         }

  856.     }

  857. 

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

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

  860.     }

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

  862. 

  863.     return 2*v - 1;

  864. }

  865. 

  866. static int read_header(FFV1Context *f){

  867.     uint8_t state[CONTEXT_SIZE];

  868.     int i, context_count;

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

  870. 

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

  872. 

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

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

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

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

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

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

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

  880.     f->plane_count= 2;

  881. 

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

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

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

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

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

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

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

  889.         default:

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

  891.             return -1;

  892.         }

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

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

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

  896.             return -1;

  897.         }

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

  899.     }else{

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

  901.         return -1;

  902.     }

  903. 

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

  905. 

  906.     context_count=1;

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

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

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

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

  911.             return -1;

  912.         }

  913.     }

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

  915. 

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

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

  918. 

  919.         p->context_count= context_count;

  920. 

  921.         if(f->ac){

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

  923.         }else{

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

  925.         }

  926.     }

  927. 

  928.     return 0;

  929. }

  930. 

  931. static int decode_init(AVCodecContext *avctx)

  932. {

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

  934. 

  935.     common_init(avctx);

  936. 

  937.     return 0;

  938. }

  939. 

  940. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_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. };

  1028. 

  1029. #ifdef CONFIG_ENCODERS

  1030. AVCodec ffv1_encoder = {

  1031.     "ffv1",

  1032.     CODEC_TYPE_VIDEO,

  1033.     CODEC_ID_FFV1,

  1034.     sizeof(FFV1Context),

  1035.     encode_init,

  1036.     encode_frame,

  1037.     common_end,

  1038.     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_RGB32, -1},

  1039. };

  1040. #endif