falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
19904 Commits
32 Branches
824MB
Tree: ecc1330a6d
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'ecc1330a6d'
${ noResults }
FFmpeg/libavcodec/ffv1.c

1155 lines
35KB
Raw Blame History 

  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. 

  60. static const int8_t quant5_10bit[256]={

  61.  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,

  62.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  63.  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

  64.  1, 1, 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,-1,

  74. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  75. -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,

  76. -1,-1,-1,-1,-1,-1,-0,-0,-0,-0,-0,-0,-0,-0,-0,-0,

  77. };

  78. 

  79. static const int8_t quant5[256]={

  80.  0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  81.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  82.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  83.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  84.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  85.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  86.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  87.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

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

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

  94. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  95. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,-1,

  96. };

  97. static const int8_t quant7[256]={

  98.  0, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  99.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

  100.  2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,

  101.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  102.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  103.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  104.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  105.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

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

  107. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  108. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  109. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

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

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

  112. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  113. -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-1,-1,

  114. };

  115. static const int8_t quant9[256]={

  116.  0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  117.  3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  118.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  119.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  120.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  121.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  122.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  123.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

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

  125. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-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,-4,-4,-4,-4,-4,-4,-4,-4,-4,-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,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  130. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,

  131. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-1,-1,

  132. };

  133. static const int8_t quant9_10bit[256]={

  134.  0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2,

  135.  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3,

  136.  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

  137.  3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  138.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  139.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  140.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  141.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  142. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  143. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  144. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  145. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  146. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,

  147. -3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,-3,

  148. -3,-3,-3,-3,-3,-3,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,

  149. -2,-2,-2,-2,-1,-1,-1,-1,-1,-1,-1,-1,-0,-0,-0,-0,

  150. };

  151. 

  152. static const int8_t quant11[256]={

  153.  0, 1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,

  154.  4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,

  155.  4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  156.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  157.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  158.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  159.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  160.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  161. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  162. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  163. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  164. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  165. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  166. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-4,-4,

  167. -4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,-4,

  168. -4,-4,-4,-4,-4,-3,-3,-3,-3,-3,-3,-3,-2,-2,-2,-1,

  169. };

  170. static const int8_t quant13[256]={

  171.  0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4,

  172.  4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  173.  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,

  174.  5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  175.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  176.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  177.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  178.  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,

  179. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  180. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  181. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  182. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,

  183. -6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-5,

  184. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  185. -5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,-5,

  186. -4,-4,-4,-4,-4,-4,-4,-4,-4,-3,-3,-3,-3,-2,-2,-1,

  187. };

  188. 

  189. typedef struct VlcState{

  190.     int16_t drift;

  191.     uint16_t error_sum;

  192.     int8_t bias;

  193.     uint8_t count;

  194. } VlcState;

  195. 

  196. typedef struct PlaneContext{

  197.     int context_count;

  198.     uint8_t (*state)[CONTEXT_SIZE];

  199.     VlcState *vlc_state;

  200.     uint8_t interlace_bit_state[2];

  201. } PlaneContext;

  202. 

  203. typedef struct FFV1Context{

  204.     AVCodecContext *avctx;

  205.     RangeCoder c;

  206.     GetBitContext gb;

  207.     PutBitContext pb;

  208.     int version;

  209.     int width, height;

  210.     int chroma_h_shift, chroma_v_shift;

  211.     int flags;

  212.     int picture_number;

  213.     AVFrame picture;

  214.     int plane_count;

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

  216.     PlaneContext plane[MAX_PLANES];

  217.     int16_t quant_table[5][256];

  218.     int run_index;

  219.     int colorspace;

  220. 

  221.     DSPContext dsp;

  222. }FFV1Context;

  223. 

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

  225.     if(bits==8)

  226.         diff= (int8_t)diff;

  227.     else{

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

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

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

  231.     }

  232. 

  233.     return diff;

  234. }

  235. 

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

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

  238.     const int  T= last[ 0];

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

  240. 

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

  242. }

  243. 

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

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

  246.     const int  T= last[ 0];

  247.     const int RT= last[ 1];

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

  249. 

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

  251.         const int TT= last2[0];

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

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

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

  255.     }else

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

  257. }

  258. 

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

  260.     int i;

  261. 

  262.     if(v){

  263.         const int a= FFABS(v);

  264.         const int e= av_log2(a);

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

  266.         if(e<=9){

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

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

  269.             }

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

  271. 

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

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

  274.             }

  275. 

  276.             if(is_signed)

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

  278.         }else{

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

  280.                 put_rac(c, state+1+FFMIN(i,9), 1);  //1..10

  281.             }

  282.             put_rac(c, state+1+9, 0);

  283. 

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

  285.                 put_rac(c, state+22+FFMIN(i,9), (a>>i)&1); //22..31

  286.             }

  287. 

  288.             if(is_signed)

  289.                 put_rac(c, state+11 + 10, v < 0); //11..21

  290.         }

  291.     }else{

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

  293.     }

  294. }

  295. 

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

  297.     put_symbol_inline(c, state, v, is_signed);

  298. }

  299. 

  300. static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state, int is_signed){

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

  302.         return 0;

  303.     else{

  304.         int i, e, a;

  305.         e= 0;

  306.         while(get_rac(c, state+1 + FFMIN(e,9))){ //1..10

  307.             e++;

  308.         }

  309. 

  310.         a= 1;

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

  312.             a += a + get_rac(c, state+22 + FFMIN(i,9)); //22..31

  313.         }

  314. 

  315.         e= -(is_signed && get_rac(c, state+11 + FFMIN(e, 10))); //11..21

  316.         return (a^e)-e;

  317.     }

  318. }

  319. 

  320. static int av_noinline get_symbol(RangeCoder *c, uint8_t *state, int is_signed){

  321.     return get_symbol_inline(c, state, is_signed);

  322. }

  323. 

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

  325.     int drift= state->drift;

  326.     int count= state->count;

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

  328.     drift += v;

  329. 

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

  331.         count >>= 1;

  332.         drift >>= 1;

  333.         state->error_sum >>= 1;

  334.     }

  335.     count++;

  336. 

  337.     if(drift <= -count){

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

  339. 

  340.         drift += count;

  341.         if(drift <= -count)

  342.             drift= -count + 1;

  343.     }else if(drift > 0){

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

  345. 

  346.         drift -= count;

  347.         if(drift > 0)

  348.             drift= 0;

  349.     }

  350. 

  351.     state->drift= drift;

  352.     state->count= count;

  353. }

  354. 

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

  356.     int i, k, code;

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

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

  359. 

  360.     i= state->count;

  361.     k=0;

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

  363.         k++;

  364.         i += i;

  365.     }

  366. 

  367.     assert(k<=8);

  368. 

  369. #if 0 // JPEG LS

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

  371.     else                                         code= v;

  372. #else

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

  374. #endif

  375. 

  376. //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);

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

  378. 

  379.     update_vlc_state(state, v);

  380. }

  381. 

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

  383.     int k, i, v, ret;

  384. 

  385.     i= state->count;

  386.     k=0;

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

  388.         k++;

  389.         i += i;

  390.     }

  391. 

  392.     assert(k<=8);

  393. 

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

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

  396. 

  397. #if 0 // JPEG LS

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

  399. #else

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

  401. #endif

  402. 

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

  404. 

  405.     update_vlc_state(state, v);

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

  407.     return ret;

  408. }

  409. 

  410. #if CONFIG_FFV1_ENCODER

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

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

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

  414.     int x;

  415.     int run_index= s->run_index;

  416.     int run_count=0;

  417.     int run_mode=0;

  418. 

  419.     if(s->ac){

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

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

  422.             return -1;

  423.         }

  424.     }else{

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

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

  427.             return -1;

  428.         }

  429.     }

  430. 

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

  432.         int diff, context;

  433. 

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

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

  436. 

  437.         if(context < 0){

  438.             context = -context;

  439.             diff= -diff;

  440.         }

  441. 

  442.         diff= fold(diff, bits);

  443. 

  444.         if(s->ac){

  445.             put_symbol_inline(c, p->state[context], diff, 1);

  446.         }else{

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

  448. 

  449.             if(run_mode){

  450. 

  451.                 if(diff){

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

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

  454.                         run_index++;

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

  456.                     }

  457. 

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

  459.                     if(run_index) run_index--;

  460.                     run_count=0;

  461.                     run_mode=0;

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

  463.                 }else{

  464.                     run_count++;

  465.                 }

  466.             }

  467. 

  468. //            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));

  469. 

  470.             if(run_mode == 0)

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

  472.         }

  473.     }

  474.     if(run_mode){

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

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

  477.             run_index++;

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

  479.         }

  480. 

  481.         if(run_count)

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

  483.     }

  484.     s->run_index= run_index;

  485. 

  486.     return 0;

  487. }

  488. 

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

  490.     int x,y,i;

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

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

  493.     s->run_index=0;

  494. 

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

  496. 

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

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

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

  500. 

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

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

  503. //{START_TIMER

  504.         if(s->avctx->bits_per_raw_sample<=8){

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

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

  507.             }

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

  509.         }else{

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

  511.                 sample[0][x]= ((uint16_t*)(src + stride*y))[x] >> (16 - s->avctx->bits_per_raw_sample);

  512.             }

  513.             encode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

  514.         }

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

  516.     }

  517. }

  518. 

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

  520.     int x, y, p, i;

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

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

  523.     s->run_index=0;

  524. 

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

  526. 

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

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

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

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

  531. 

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

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

  534.             int b= v&0xFF;

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

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

  537. 

  538.             b -= g;

  539.             r -= g;

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

  541.             b += 0x100;

  542.             r += 0x100;

  543. 

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

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

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

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

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

  549.         }

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

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

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

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

  554.         }

  555.     }

  556. }

  557. 

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

  559.     int last=0;

  560.     int i;

  561.     uint8_t state[CONTEXT_SIZE];

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

  563. 

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

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

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

  567.             last= i;

  568.         }

  569.     }

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

  571. }

  572. 

  573. static void write_header(FFV1Context *f){

  574.     uint8_t state[CONTEXT_SIZE];

  575.     int i;

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

  577. 

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

  579. 

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

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

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

  583.     if(f->version>0)

  584.         put_symbol(c, state, f->avctx->bits_per_raw_sample, 0);

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

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

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

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

  589. 

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

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

  592. }

  593. #endif /* CONFIG_FFV1_ENCODER */

  594. 

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

  596.     FFV1Context *s = avctx->priv_data;

  597. 

  598.     s->avctx= avctx;

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

  600. 

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

  602. 

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

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

  605. 

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

  607. 

  608.     return 0;

  609. }

  610. 

  611. #if CONFIG_FFV1_ENCODER

  612. static av_cold int encode_init(AVCodecContext *avctx)

  613. {

  614.     FFV1Context *s = avctx->priv_data;

  615.     int i;

  616. 

  617.     common_init(avctx);

  618. 

  619.     s->version=0;

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

  621. 

  622.     s->plane_count=2;

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

  624.         if(avctx->bits_per_raw_sample <=8){

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

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

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

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

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

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

  631.             }else{

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

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

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

  635.             }

  636.         }else{

  637.             s->quant_table[0][i]=           quant9_10bit[i];

  638.             s->quant_table[1][i]=        11*quant9_10bit[i];

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

  640.                 s->quant_table[2][i]=     11*11*quant9_10bit[i];

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

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

  643.             }else{

  644.                 s->quant_table[2][i]=     11*11*quant5_10bit[i];

  645.                 s->quant_table[3][i]=   5*11*11*quant5_10bit[i];

  646.                 s->quant_table[4][i]= 5*5*11*11*quant5_10bit[i];

  647.             }

  648.         }

  649.     }

  650. 

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

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

  653. 

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

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

  656.         }else{

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

  658.         }

  659. 

  660.         if(s->ac){

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

  662.         }else{

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

  664.         }

  665.     }

  666. 

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

  668.     switch(avctx->pix_fmt){

  669.     case PIX_FMT_YUV444P16:

  670.     case PIX_FMT_YUV422P16:

  671.     case PIX_FMT_YUV420P16:

  672.         if(avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){

  673.             av_log(avctx, AV_LOG_ERROR, "More than 8 bit per component is still experimental and no gurantee is yet made for future compatibility\n"

  674.                "Use vstrict=-2 / -strict -2 to use it anyway.\n");

  675.             return -1;

  676.         }

  677.         if(avctx->bits_per_raw_sample <=8){

  678.             av_log(avctx, AV_LOG_ERROR, "bits_per_raw_sample inavlid\n");

  679.             return -1;

  680.         }

  681.         s->version= 1;

  682.     case PIX_FMT_YUV444P:

  683.     case PIX_FMT_YUV422P:

  684.     case PIX_FMT_YUV420P:

  685.     case PIX_FMT_YUV411P:

  686.     case PIX_FMT_YUV410P:

  687.         s->colorspace= 0;

  688.         break;

  689.     case PIX_FMT_RGB32:

  690.         s->colorspace= 1;

  691.         break;

  692.     default:

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

  694.         return -1;

  695.     }

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

  697. 

  698.     s->picture_number=0;

  699. 

  700.     return 0;

  701. }

  702. #endif /* CONFIG_FFV1_ENCODER */

  703. 

  704. 

  705. static void clear_state(FFV1Context *f){

  706.     int i, j;

  707. 

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

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

  710. 

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

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

  713. 

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

  715.             if(f->ac){

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

  717.             }else{

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

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

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

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

  722.             }

  723.         }

  724.     }

  725. }

  726. 

  727. #if CONFIG_FFV1_ENCODER

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

  729.     FFV1Context *f = avctx->priv_data;

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

  731.     AVFrame *pict = data;

  732.     const int width= f->width;

  733.     const int height= f->height;

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

  735.     int used_count= 0;

  736.     uint8_t keystate=128;

  737. 

  738.     ff_init_range_encoder(c, buf, buf_size);

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

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

  741. 

  742.     *p = *pict;

  743.     p->pict_type= FF_I_TYPE;

  744. 

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

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

  747.         p->key_frame= 1;

  748.         write_header(f);

  749.         clear_state(f);

  750.     }else{

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

  752.         p->key_frame= 0;

  753.     }

  754. 

  755.     if(!f->ac){

  756.         used_count += ff_rac_terminate(c);

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

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

  759.     }

  760. 

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

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

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

  764. 

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

  766. 

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

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

  769.     }else{

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

  771.     }

  772.     emms_c();

  773. 

  774.     f->picture_number++;

  775. 

  776.     if(f->ac){

  777.         return ff_rac_terminate(c);

  778.     }else{

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

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

  781.     }

  782. }

  783. #endif /* CONFIG_FFV1_ENCODER */

  784. 

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

  786.     FFV1Context *s = avctx->priv_data;

  787.     int i;

  788. 

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

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

  791. 

  792.         av_freep(&p->state);

  793.         av_freep(&p->vlc_state);

  794.     }

  795. 

  796.     return 0;

  797. }

  798. 

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

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

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

  802.     int x;

  803.     int run_count=0;

  804.     int run_mode=0;

  805.     int run_index= s->run_index;

  806. 

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

  808.         int diff, context, sign;

  809. 

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

  811.         if(context < 0){

  812.             context= -context;

  813.             sign=1;

  814.         }else

  815.             sign=0;

  816. 

  817. 

  818.         if(s->ac){

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

  820.         }else{

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

  822. 

  823.             if(run_mode){

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

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

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

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

  828.                     }else{

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

  830.                         else run_count=0;

  831.                         if(run_index) run_index--;

  832.                         run_mode=2;

  833.                     }

  834.                 }

  835.                 run_count--;

  836.                 if(run_count < 0){

  837.                     run_mode=0;

  838.                     run_count=0;

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

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

  841.                 }else

  842.                     diff=0;

  843.             }else

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

  845. 

  846. //            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));

  847.         }

  848. 

  849.         if(sign) diff= -diff;

  850. 

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

  852.     }

  853.     s->run_index= run_index;

  854. }

  855. 

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

  857.     int x, y;

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

  859.     int_fast16_t *sample[2];

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

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

  862. 

  863.     s->run_index=0;

  864. 

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

  866. 

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

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

  869. 

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

  871.         sample[1]= temp;

  872. 

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

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

  875. 

  876. //{START_TIMER

  877.         if(s->avctx->bits_per_raw_sample <= 8){

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

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

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

  881.             }

  882.         }else{

  883.             decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

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

  885.                 ((uint16_t*)(src + stride*y))[x]= sample[1][x] << (16 - s->avctx->bits_per_raw_sample);

  886.             }

  887.         }

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

  889.     }

  890. }

  891. 

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

  893.     int x, y, p;

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

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

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

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

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

  899.     }

  900. 

  901.     s->run_index=0;

  902. 

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

  904. 

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

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

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

  908. 

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

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

  911. 

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

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

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

  915.         }

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

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

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

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

  920. 

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

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

  923. 

  924.             b -= 0x100;

  925.             r -= 0x100;

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

  927.             b += g;

  928.             r += g;

  929. 

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

  931.         }

  932.     }

  933. }

  934. 

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

  936.     int v;

  937.     int i=0;

  938.     uint8_t state[CONTEXT_SIZE];

  939. 

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

  941. 

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

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

  944. 

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

  946. 

  947.         while(len--){

  948.             quant_table[i] = scale*v;

  949.             i++;

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

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

  952.         }

  953.     }

  954. 

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

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

  957.     }

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

  959. 

  960.     return 2*v - 1;

  961. }

  962. 

  963. static int read_header(FFV1Context *f){

  964.     uint8_t state[CONTEXT_SIZE];

  965.     int i, context_count;

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

  967. 

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

  969. 

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

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

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

  973.     if(f->version>0)

  974.         f->avctx->bits_per_raw_sample= get_symbol(c, state, 0);

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

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

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

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

  979.     f->plane_count= 2;

  980. 

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

  982.         if(f->avctx->bits_per_raw_sample<=8){

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

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

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

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

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

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

  989.             default:

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

  991.                 return -1;

  992.             }

  993.         }else{

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

  995.             case 0x00: f->avctx->pix_fmt= PIX_FMT_YUV444P16; break;

  996.             case 0x10: f->avctx->pix_fmt= PIX_FMT_YUV422P16; break;

  997.             case 0x11: f->avctx->pix_fmt= PIX_FMT_YUV420P16; break;

  998.             default:

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

  1000.                 return -1;

  1001.             }

  1002.         }

  1003.     }else if(f->colorspace==1){

  1004.         if(f->chroma_h_shift || f->chroma_v_shift){

  1005.             av_log(f->avctx, AV_LOG_ERROR, "chroma subsampling not supported in this colorspace\n");

  1006.             return -1;

  1007.         }

  1008.         f->avctx->pix_fmt= PIX_FMT_RGB32;

  1009.     }else{

  1010.         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

  1011.         return -1;

  1012.     }

  1013. 

  1014. //printf("%d %d %d\n", f->chroma_h_shift, f->chroma_v_shift,f->avctx->pix_fmt);

  1015. 

  1016.     context_count=1;

  1017.     for(i=0; i<5; i++){

  1018.         context_count*= read_quant_table(c, f->quant_table[i], context_count);

  1019.         if(context_count < 0 || context_count > 32768){

  1020.             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

  1021.             return -1;

  1022.         }

  1023.     }

  1024.     context_count= (context_count+1)/2;

  1025. 

  1026.     for(i=0; i<f->plane_count; i++){

  1027.         PlaneContext * const p= &f->plane[i];

  1028. 

  1029.         p->context_count= context_count;

  1030. 

  1031.         if(f->ac){

  1032.             if(!p->state) p->state= av_malloc(CONTEXT_SIZE*p->context_count*sizeof(uint8_t));

  1033.         }else{

  1034.             if(!p->vlc_state) p->vlc_state= av_malloc(p->context_count*sizeof(VlcState));

  1035.         }

  1036.     }

  1037. 

  1038.     return 0;

  1039. }

  1040. 

  1041. static av_cold int decode_init(AVCodecContext *avctx)

  1042. {

  1043. //    FFV1Context *s = avctx->priv_data;

  1044. 

  1045.     common_init(avctx);

  1046. 

  1047.     return 0;

  1048. }

  1049. 

  1050. static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt){

  1051.     const uint8_t *buf = avpkt->data;

  1052.     int buf_size = avpkt->size;

  1053.     FFV1Context *f = avctx->priv_data;

  1054.     RangeCoder * const c= &f->c;

  1055.     const int width= f->width;

  1056.     const int height= f->height;

  1057.     AVFrame * const p= &f->picture;

  1058.     int bytes_read;

  1059.     uint8_t keystate= 128;

  1060. 

  1061.     AVFrame *picture = data;

  1062. 

  1063.     ff_init_range_decoder(c, buf, buf_size);

  1064.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1065. 

  1066. 

  1067.     p->pict_type= FF_I_TYPE; //FIXME I vs. P

  1068.     if(get_rac(c, &keystate)){

  1069.         p->key_frame= 1;

  1070.         if(read_header(f) < 0)

  1071.             return -1;

  1072.         clear_state(f);

  1073.     }else{

  1074.         p->key_frame= 0;

  1075.     }

  1076.     if(!f->plane[0].state && !f->plane[0].vlc_state)

  1077.         return -1;

  1078. 

  1079.     p->reference= 0;

  1080.     if(avctx->get_buffer(avctx, p) < 0){

  1081.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1082.         return -1;

  1083.     }

  1084. 

  1085.     if(avctx->debug&FF_DEBUG_PICT_INFO)

  1086.         av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);

  1087. 

  1088.     if(!f->ac){

  1089.         bytes_read = c->bytestream - c->bytestream_start - 1;

  1090.         if(bytes_read ==0) av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); //FIXME

  1091. //printf("pos=%d\n", bytes_read);

  1092.         init_get_bits(&f->gb, buf + bytes_read, buf_size - bytes_read);

  1093.     } else {

  1094.         bytes_read = 0; /* avoid warning */

  1095.     }

  1096. 

  1097.     if(f->colorspace==0){

  1098.         const int chroma_width = -((-width )>>f->chroma_h_shift);

  1099.         const int chroma_height= -((-height)>>f->chroma_v_shift);

  1100.         decode_plane(f, p->data[0], width, height, p->linesize[0], 0);

  1101. 

  1102.         decode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);

  1103.         decode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);

  1104.     }else{

  1105.         decode_rgb_frame(f, (uint32_t*)p->data[0], width, height, p->linesize[0]/4);

  1106.     }

  1107. 

  1108.     emms_c();

  1109. 

  1110.     f->picture_number++;

  1111. 

  1112.     *picture= *p;

  1113. 

  1114.     avctx->release_buffer(avctx, p); //FIXME

  1115. 

  1116.     *data_size = sizeof(AVFrame);

  1117. 

  1118.     if(f->ac){

  1119.         bytes_read= c->bytestream - c->bytestream_start - 1;

  1120.         if(bytes_read ==0) av_log(f->avctx, AV_LOG_ERROR, "error at end of frame\n");

  1121.     }else{

  1122.         bytes_read+= (get_bits_count(&f->gb)+7)/8;

  1123.     }

  1124. 

  1125.     return bytes_read;

  1126. }

  1127. 

  1128. AVCodec ffv1_decoder = {

  1129.     "ffv1",

  1130.     CODEC_TYPE_VIDEO,

  1131.     CODEC_ID_FFV1,

  1132.     sizeof(FFV1Context),

  1133.     decode_init,

  1134.     NULL,

  1135.     common_end,

  1136.     decode_frame,

  1137.     CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

  1138.     NULL,

  1139.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg codec #1"),

  1140. };

  1141. 

  1142. #if CONFIG_FFV1_ENCODER

  1143. AVCodec ffv1_encoder = {

  1144.     "ffv1",

  1145.     CODEC_TYPE_VIDEO,

  1146.     CODEC_ID_FFV1,

  1147.     sizeof(FFV1Context),

  1148.     encode_init,

  1149.     encode_frame,

  1150.     common_end,

  1151.     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_RGB32, PIX_FMT_YUV420P16, PIX_FMT_YUV422P16, PIX_FMT_YUV444P16, PIX_FMT_NONE},

  1152.     .long_name= NULL_IF_CONFIG_SMALL("FFmpeg codec #1"),

  1153. };

  1154. #endif