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FFmpeg/libavcodec/huffyuv.c

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  1. /*

  2.  * huffyuv codec for libavcodec

  3.  *

  4.  * Copyright (c) 2002-2003 Michael Niedermayer <michaelni@gmx.at>

  5.  *

  6.  * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of

  7.  * the algorithm used

  8.  *

  9.  * This file is part of FFmpeg.

  10.  *

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

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

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

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

  15.  *

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

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

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

  19.  * Lesser General Public License for more details.

  20.  *

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

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

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

  24.  */

  25. 

  26. /**

  27.  * @file

  28.  * huffyuv codec for libavcodec.

  29.  */

  30. 

  31. #include "avcodec.h"

  32. #include "get_bits.h"

  33. #include "put_bits.h"

  34. #include "dsputil.h"

  35. 

  36. #define VLC_BITS 11

  37. 

  38. #if HAVE_BIGENDIAN

  39. #define B 3

  40. #define G 2

  41. #define R 1

  42. #define A 0

  43. #else

  44. #define B 0

  45. #define G 1

  46. #define R 2

  47. #define A 3

  48. #endif

  49. 

  50. typedef enum Predictor{

  51.     LEFT= 0,

  52.     PLANE,

  53.     MEDIAN,

  54. } Predictor;

  55. 

  56. typedef struct HYuvContext{

  57.     AVCodecContext *avctx;

  58.     Predictor predictor;

  59.     GetBitContext gb;

  60.     PutBitContext pb;

  61.     int interlaced;

  62.     int decorrelate;

  63.     int bitstream_bpp;

  64.     int version;

  65.     int yuy2;                               //use yuy2 instead of 422P

  66.     int bgr32;                              //use bgr32 instead of bgr24

  67.     int width, height;

  68.     int flags;

  69.     int context;

  70.     int picture_number;

  71.     int last_slice_end;

  72.     uint8_t *temp[3];

  73.     uint64_t stats[3][256];

  74.     uint8_t len[3][256];

  75.     uint32_t bits[3][256];

  76.     uint32_t pix_bgr_map[1<<VLC_BITS];

  77.     VLC vlc[6];                             //Y,U,V,YY,YU,YV

  78.     AVFrame picture;

  79.     uint8_t *bitstream_buffer;

  80.     unsigned int bitstream_buffer_size;

  81.     DSPContext dsp;

  82. }HYuvContext;

  83. 

  84. static const unsigned char classic_shift_luma[] = {

  85.   34,36,35,69,135,232,9,16,10,24,11,23,12,16,13,10,14,8,15,8,

  86.   16,8,17,20,16,10,207,206,205,236,11,8,10,21,9,23,8,8,199,70,

  87.   69,68, 0

  88. };

  89. 

  90. static const unsigned char classic_shift_chroma[] = {

  91.   66,36,37,38,39,40,41,75,76,77,110,239,144,81,82,83,84,85,118,183,

  92.   56,57,88,89,56,89,154,57,58,57,26,141,57,56,58,57,58,57,184,119,

  93.   214,245,116,83,82,49,80,79,78,77,44,75,41,40,39,38,37,36,34, 0

  94. };

  95. 

  96. static const unsigned char classic_add_luma[256] = {

  97.     3,  9,  5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,

  98.    73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,

  99.    68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,

  100.    35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,

  101.    37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,

  102.    35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,

  103.    27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,

  104.    15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,

  105.    12, 17, 19, 13,  4,  9,  2, 11,  1,  7,  8,  0, 16,  3, 14,  6,

  106.    12, 10,  5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,

  107.    18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,

  108.    28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,

  109.    28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,

  110.    62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,

  111.    54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,

  112.    46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13,  7,  8,

  113. };

  114. 

  115. static const unsigned char classic_add_chroma[256] = {

  116.     3,  1,  2,  2,  2,  2,  3,  3,  7,  5,  7,  5,  8,  6, 11,  9,

  117.     7, 13, 11, 10,  9,  8,  7,  5,  9,  7,  6,  4,  7,  5,  8,  7,

  118.    11,  8, 13, 11, 19, 15, 22, 23, 20, 33, 32, 28, 27, 29, 51, 77,

  119.    43, 45, 76, 81, 46, 82, 75, 55, 56,144, 58, 80, 60, 74,147, 63,

  120.   143, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,

  121.    80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 27, 30, 21, 22,

  122.    17, 14,  5,  6,100, 54, 47, 50, 51, 53,106,107,108,109,110,111,

  123.   112,113,114,115,  4,117,118, 92, 94,121,122,  3,124,103,  2,  1,

  124.     0,129,130,131,120,119,126,125,136,137,138,139,140,141,142,134,

  125.   135,132,133,104, 64,101, 62, 57,102, 95, 93, 59, 61, 28, 97, 96,

  126.    52, 49, 48, 29, 32, 25, 24, 46, 23, 98, 45, 44, 43, 20, 42, 41,

  127.    19, 18, 99, 40, 15, 39, 38, 16, 13, 12, 11, 37, 10,  9,  8, 36,

  128.     7,128,127,105,123,116, 35, 34, 33,145, 31, 79, 42,146, 78, 26,

  129.    83, 48, 49, 50, 44, 47, 26, 31, 30, 18, 17, 19, 21, 24, 25, 13,

  130.    14, 16, 17, 18, 20, 21, 12, 14, 15,  9, 10,  6,  9,  6,  5,  8,

  131.     6, 12,  8, 10,  7,  9,  6,  4,  6,  2,  2,  3,  3,  3,  3,  2,

  132. };

  133. 

  134. static inline int sub_left_prediction(HYuvContext *s, uint8_t *dst, uint8_t *src, int w, int left){

  135.     int i;

  136.     if(w<32){

  137.         for(i=0; i<w; i++){

  138.             const int temp= src[i];

  139.             dst[i]= temp - left;

  140.             left= temp;

  141.         }

  142.         return left;

  143.     }else{

  144.         for(i=0; i<16; i++){

  145.             const int temp= src[i];

  146.             dst[i]= temp - left;

  147.             left= temp;

  148.         }

  149.         s->dsp.diff_bytes(dst+16, src+16, src+15, w-16);

  150.         return src[w-1];

  151.     }

  152. }

  153. 

  154. static inline void sub_left_prediction_bgr32(HYuvContext *s, uint8_t *dst, uint8_t *src, int w, int *red, int *green, int *blue){

  155.     int i;

  156.     int r,g,b;

  157.     r= *red;

  158.     g= *green;

  159.     b= *blue;

  160.     for(i=0; i<FFMIN(w,4); i++){

  161.         const int rt= src[i*4+R];

  162.         const int gt= src[i*4+G];

  163.         const int bt= src[i*4+B];

  164.         dst[i*4+R]= rt - r;

  165.         dst[i*4+G]= gt - g;

  166.         dst[i*4+B]= bt - b;

  167.         r = rt;

  168.         g = gt;

  169.         b = bt;

  170.     }

  171.     s->dsp.diff_bytes(dst+16, src+16, src+12, w*4-16);

  172.     *red=   src[(w-1)*4+R];

  173.     *green= src[(w-1)*4+G];

  174.     *blue=  src[(w-1)*4+B];

  175. }

  176. 

  177. static int read_len_table(uint8_t *dst, GetBitContext *gb){

  178.     int i, val, repeat;

  179. 

  180.     for(i=0; i<256;){

  181.         repeat= get_bits(gb, 3);

  182.         val   = get_bits(gb, 5);

  183.         if(repeat==0)

  184.             repeat= get_bits(gb, 8);

  185. //printf("%d %d\n", val, repeat);

  186.         if(i+repeat > 256) {

  187.             av_log(NULL, AV_LOG_ERROR, "Error reading huffman table\n");

  188.             return -1;

  189.         }

  190.         while (repeat--)

  191.             dst[i++] = val;

  192.     }

  193.     return 0;

  194. }

  195. 

  196. static int generate_bits_table(uint32_t *dst, const uint8_t *len_table){

  197.     int len, index;

  198.     uint32_t bits=0;

  199. 

  200.     for(len=32; len>0; len--){

  201.         for(index=0; index<256; index++){

  202.             if(len_table[index]==len)

  203.                 dst[index]= bits++;

  204.         }

  205.         if(bits & 1){

  206.             av_log(NULL, AV_LOG_ERROR, "Error generating huffman table\n");

  207.             return -1;

  208.         }

  209.         bits >>= 1;

  210.     }

  211.     return 0;

  212. }

  213. 

  214. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  215. typedef struct {

  216.     uint64_t val;

  217.     int name;

  218. } HeapElem;

  219. 

  220. static void heap_sift(HeapElem *h, int root, int size)

  221. {

  222.     while(root*2+1 < size) {

  223.         int child = root*2+1;

  224.         if(child < size-1 && h[child].val > h[child+1].val)

  225.             child++;

  226.         if(h[root].val > h[child].val) {

  227.             FFSWAP(HeapElem, h[root], h[child]);

  228.             root = child;

  229.         } else

  230.             break;

  231.     }

  232. }

  233. 

  234. static void generate_len_table(uint8_t *dst, const uint64_t *stats){

  235.     HeapElem h[256];

  236.     int up[2*256];

  237.     int len[2*256];

  238.     int offset, i, next;

  239.     int size = 256;

  240. 

  241.     for(offset=1; ; offset<<=1){

  242.         for(i=0; i<size; i++){

  243.             h[i].name = i;

  244.             h[i].val = (stats[i] << 8) + offset;

  245.         }

  246.         for(i=size/2-1; i>=0; i--)

  247.             heap_sift(h, i, size);

  248. 

  249.         for(next=size; next<size*2-1; next++){

  250.             // merge the two smallest entries, and put it back in the heap

  251.             uint64_t min1v = h[0].val;

  252.             up[h[0].name] = next;

  253.             h[0].val = INT64_MAX;

  254.             heap_sift(h, 0, size);

  255.             up[h[0].name] = next;

  256.             h[0].name = next;

  257.             h[0].val += min1v;

  258.             heap_sift(h, 0, size);

  259.         }

  260. 

  261.         len[2*size-2] = 0;

  262.         for(i=2*size-3; i>=size; i--)

  263.             len[i] = len[up[i]] + 1;

  264.         for(i=0; i<size; i++) {

  265.             dst[i] = len[up[i]] + 1;

  266.             if(dst[i] >= 32) break;

  267.         }

  268.         if(i==size) break;

  269.     }

  270. }

  271. #endif /* CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER */

  272. 

  273. static void generate_joint_tables(HYuvContext *s){

  274.     uint16_t symbols[1<<VLC_BITS];

  275.     uint16_t bits[1<<VLC_BITS];

  276.     uint8_t len[1<<VLC_BITS];

  277.     if(s->bitstream_bpp < 24){

  278.         int p, i, y, u;

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

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

  281.                 int len0 = s->len[0][y];

  282.                 int limit = VLC_BITS - len0;

  283.                 if(limit <= 0)

  284.                     continue;

  285.                 for(u=0; u<256; u++){

  286.                     int len1 = s->len[p][u];

  287.                     if(len1 > limit)

  288.                         continue;

  289.                     len[i] = len0 + len1;

  290.                     bits[i] = (s->bits[0][y] << len1) + s->bits[p][u];

  291.                     symbols[i] = (y<<8) + u;

  292.                     if(symbols[i] != 0xffff) // reserved to mean "invalid"

  293.                         i++;

  294.                 }

  295.             }

  296.             free_vlc(&s->vlc[3+p]);

  297.             init_vlc_sparse(&s->vlc[3+p], VLC_BITS, i, len, 1, 1, bits, 2, 2, symbols, 2, 2, 0);

  298.         }

  299.     }else{

  300.         uint8_t (*map)[4] = (uint8_t(*)[4])s->pix_bgr_map;

  301.         int i, b, g, r, code;

  302.         int p0 = s->decorrelate;

  303.         int p1 = !s->decorrelate;

  304.         // restrict the range to +/-16 becaues that's pretty much guaranteed to

  305.         // cover all the combinations that fit in 11 bits total, and it doesn't

  306.         // matter if we miss a few rare codes.

  307.         for(i=0, g=-16; g<16; g++){

  308.             int len0 = s->len[p0][g&255];

  309.             int limit0 = VLC_BITS - len0;

  310.             if(limit0 < 2)

  311.                 continue;

  312.             for(b=-16; b<16; b++){

  313.                 int len1 = s->len[p1][b&255];

  314.                 int limit1 = limit0 - len1;

  315.                 if(limit1 < 1)

  316.                     continue;

  317.                 code = (s->bits[p0][g&255] << len1) + s->bits[p1][b&255];

  318.                 for(r=-16; r<16; r++){

  319.                     int len2 = s->len[2][r&255];

  320.                     if(len2 > limit1)

  321.                         continue;

  322.                     len[i] = len0 + len1 + len2;

  323.                     bits[i] = (code << len2) + s->bits[2][r&255];

  324.                     if(s->decorrelate){

  325.                         map[i][G] = g;

  326.                         map[i][B] = g+b;

  327.                         map[i][R] = g+r;

  328.                     }else{

  329.                         map[i][B] = g;

  330.                         map[i][G] = b;

  331.                         map[i][R] = r;

  332.                     }

  333.                     i++;

  334.                 }

  335.             }

  336.         }

  337.         free_vlc(&s->vlc[3]);

  338.         init_vlc(&s->vlc[3], VLC_BITS, i, len, 1, 1, bits, 2, 2, 0);

  339.     }

  340. }

  341. 

  342. static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length){

  343.     GetBitContext gb;

  344.     int i;

  345. 

  346.     init_get_bits(&gb, src, length*8);

  347. 

  348.     for(i=0; i<3; i++){

  349.         if(read_len_table(s->len[i], &gb)<0)

  350.             return -1;

  351.         if(generate_bits_table(s->bits[i], s->len[i])<0){

  352.             return -1;

  353.         }

  354. #if 0

  355. for(j=0; j<256; j++){

  356. printf("%6X, %2d,  %3d\n", s->bits[i][j], s->len[i][j], j);

  357. }

  358. #endif

  359.         free_vlc(&s->vlc[i]);

  360.         init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1, s->bits[i], 4, 4, 0);

  361.     }

  362. 

  363.     generate_joint_tables(s);

  364. 

  365.     return (get_bits_count(&gb)+7)/8;

  366. }

  367. 

  368. static int read_old_huffman_tables(HYuvContext *s){

  369. #if 1

  370.     GetBitContext gb;

  371.     int i;

  372. 

  373.     init_get_bits(&gb, classic_shift_luma, sizeof(classic_shift_luma)*8);

  374.     if(read_len_table(s->len[0], &gb)<0)

  375.         return -1;

  376.     init_get_bits(&gb, classic_shift_chroma, sizeof(classic_shift_chroma)*8);

  377.     if(read_len_table(s->len[1], &gb)<0)

  378.         return -1;

  379. 

  380.     for(i=0; i<256; i++) s->bits[0][i] = classic_add_luma  [i];

  381.     for(i=0; i<256; i++) s->bits[1][i] = classic_add_chroma[i];

  382. 

  383.     if(s->bitstream_bpp >= 24){

  384.         memcpy(s->bits[1], s->bits[0], 256*sizeof(uint32_t));

  385.         memcpy(s->len[1] , s->len [0], 256*sizeof(uint8_t));

  386.     }

  387.     memcpy(s->bits[2], s->bits[1], 256*sizeof(uint32_t));

  388.     memcpy(s->len[2] , s->len [1], 256*sizeof(uint8_t));

  389. 

  390.     for(i=0; i<3; i++){

  391.         free_vlc(&s->vlc[i]);

  392.         init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1, s->bits[i], 4, 4, 0);

  393.     }

  394. 

  395.     generate_joint_tables(s);

  396. 

  397.     return 0;

  398. #else

  399.     av_log(s->avctx, AV_LOG_DEBUG, "v1 huffyuv is not supported \n");

  400.     return -1;

  401. #endif

  402. }

  403. 

  404. static av_cold void alloc_temp(HYuvContext *s){

  405.     int i;

  406. 

  407.     if(s->bitstream_bpp<24){

  408.         for(i=0; i<3; i++){

  409.             s->temp[i]= av_malloc(s->width + 16);

  410.         }

  411.     }else{

  412.         s->temp[0]= av_mallocz(4*s->width + 16);

  413.     }

  414. }

  415. 

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

  417.     HYuvContext *s = avctx->priv_data;

  418. 

  419.     s->avctx= avctx;

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

  421. 

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

  423. 

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

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

  426.     assert(s->width>0 && s->height>0);

  427. 

  428.     return 0;

  429. }

  430. 

  431. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

  432. static av_cold int decode_init(AVCodecContext *avctx)

  433. {

  434.     HYuvContext *s = avctx->priv_data;

  435. 

  436.     common_init(avctx);

  437.     memset(s->vlc, 0, 3*sizeof(VLC));

  438. 

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

  440.     s->interlaced= s->height > 288;

  441. 

  442. s->bgr32=1;

  443. //if(avctx->extradata)

  444. //  printf("extradata:%X, extradata_size:%d\n", *(uint32_t*)avctx->extradata, avctx->extradata_size);

  445.     if(avctx->extradata_size){

  446.         if((avctx->bits_per_coded_sample&7) && avctx->bits_per_coded_sample != 12)

  447.             s->version=1; // do such files exist at all?

  448.         else

  449.             s->version=2;

  450.     }else

  451.         s->version=0;

  452. 

  453.     if(s->version==2){

  454.         int method, interlace;

  455. 

  456.         if (avctx->extradata_size < 4)

  457.             return -1;

  458. 

  459.         method= ((uint8_t*)avctx->extradata)[0];

  460.         s->decorrelate= method&64 ? 1 : 0;

  461.         s->predictor= method&63;

  462.         s->bitstream_bpp= ((uint8_t*)avctx->extradata)[1];

  463.         if(s->bitstream_bpp==0)

  464.             s->bitstream_bpp= avctx->bits_per_coded_sample&~7;

  465.         interlace= (((uint8_t*)avctx->extradata)[2] & 0x30) >> 4;

  466.         s->interlaced= (interlace==1) ? 1 : (interlace==2) ? 0 : s->interlaced;

  467.         s->context= ((uint8_t*)avctx->extradata)[2] & 0x40 ? 1 : 0;

  468. 

  469.         if(read_huffman_tables(s, ((uint8_t*)avctx->extradata)+4, avctx->extradata_size-4) < 0)

  470.             return -1;

  471.     }else{

  472.         switch(avctx->bits_per_coded_sample&7){

  473.         case 1:

  474.             s->predictor= LEFT;

  475.             s->decorrelate= 0;

  476.             break;

  477.         case 2:

  478.             s->predictor= LEFT;

  479.             s->decorrelate= 1;

  480.             break;

  481.         case 3:

  482.             s->predictor= PLANE;

  483.             s->decorrelate= avctx->bits_per_coded_sample >= 24;

  484.             break;

  485.         case 4:

  486.             s->predictor= MEDIAN;

  487.             s->decorrelate= 0;

  488.             break;

  489.         default:

  490.             s->predictor= LEFT; //OLD

  491.             s->decorrelate= 0;

  492.             break;

  493.         }

  494.         s->bitstream_bpp= avctx->bits_per_coded_sample & ~7;

  495.         s->context= 0;

  496. 

  497.         if(read_old_huffman_tables(s) < 0)

  498.             return -1;

  499.     }

  500. 

  501.     switch(s->bitstream_bpp){

  502.     case 12:

  503.         avctx->pix_fmt = PIX_FMT_YUV420P;

  504.         break;

  505.     case 16:

  506.         if(s->yuy2){

  507.             avctx->pix_fmt = PIX_FMT_YUYV422;

  508.         }else{

  509.             avctx->pix_fmt = PIX_FMT_YUV422P;

  510.         }

  511.         break;

  512.     case 24:

  513.     case 32:

  514.         if(s->bgr32){

  515.             avctx->pix_fmt = PIX_FMT_RGB32;

  516.         }else{

  517.             avctx->pix_fmt = PIX_FMT_BGR24;

  518.         }

  519.         break;

  520.     default:

  521.         assert(0);

  522.     }

  523. 

  524.     alloc_temp(s);

  525. 

  526. //    av_log(NULL, AV_LOG_DEBUG, "pred:%d bpp:%d hbpp:%d il:%d\n", s->predictor, s->bitstream_bpp, avctx->bits_per_coded_sample, s->interlaced);

  527. 

  528.     return 0;

  529. }

  530. #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */

  531. 

  532. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  533. static int store_table(HYuvContext *s, const uint8_t *len, uint8_t *buf){

  534.     int i;

  535.     int index= 0;

  536. 

  537.     for(i=0; i<256;){

  538.         int val= len[i];

  539.         int repeat=0;

  540. 

  541.         for(; i<256 && len[i]==val && repeat<255; i++)

  542.             repeat++;

  543. 

  544.         assert(val < 32 && val >0 && repeat<256 && repeat>0);

  545.         if(repeat>7){

  546.             buf[index++]= val;

  547.             buf[index++]= repeat;

  548.         }else{

  549.             buf[index++]= val | (repeat<<5);

  550.         }

  551.     }

  552. 

  553.     return index;

  554. }

  555. 

  556. static av_cold int encode_init(AVCodecContext *avctx)

  557. {

  558.     HYuvContext *s = avctx->priv_data;

  559.     int i, j;

  560. 

  561.     common_init(avctx);

  562. 

  563.     avctx->extradata= av_mallocz(1024*30); // 256*3+4 == 772

  564.     avctx->stats_out= av_mallocz(1024*30); // 21*256*3(%llu ) + 3(\n) + 1(0) = 16132

  565.     s->version=2;

  566. 

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

  568. 

  569.     switch(avctx->pix_fmt){

  570.     case PIX_FMT_YUV420P:

  571.         s->bitstream_bpp= 12;

  572.         break;

  573.     case PIX_FMT_YUV422P:

  574.         s->bitstream_bpp= 16;

  575.         break;

  576.     case PIX_FMT_RGB32:

  577.         s->bitstream_bpp= 24;

  578.         break;

  579.     default:

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

  581.         return -1;

  582.     }

  583.     avctx->bits_per_coded_sample= s->bitstream_bpp;

  584.     s->decorrelate= s->bitstream_bpp >= 24;

  585.     s->predictor= avctx->prediction_method;

  586.     s->interlaced= avctx->flags&CODEC_FLAG_INTERLACED_ME ? 1 : 0;

  587.     if(avctx->context_model==1){

  588.         s->context= avctx->context_model;

  589.         if(s->flags & (CODEC_FLAG_PASS1|CODEC_FLAG_PASS2)){

  590.             av_log(avctx, AV_LOG_ERROR, "context=1 is not compatible with 2 pass huffyuv encoding\n");

  591.             return -1;

  592.         }

  593.     }else s->context= 0;

  594. 

  595.     if(avctx->codec->id==CODEC_ID_HUFFYUV){

  596.         if(avctx->pix_fmt==PIX_FMT_YUV420P){

  597.             av_log(avctx, AV_LOG_ERROR, "Error: YV12 is not supported by huffyuv; use vcodec=ffvhuff or format=422p\n");

  598.             return -1;

  599.         }

  600.         if(avctx->context_model){

  601.             av_log(avctx, AV_LOG_ERROR, "Error: per-frame huffman tables are not supported by huffyuv; use vcodec=ffvhuff\n");

  602.             return -1;

  603.         }

  604.         if(s->interlaced != ( s->height > 288 ))

  605.             av_log(avctx, AV_LOG_INFO, "using huffyuv 2.2.0 or newer interlacing flag\n");

  606.     }

  607. 

  608.     if(s->bitstream_bpp>=24 && s->predictor==MEDIAN){

  609.         av_log(avctx, AV_LOG_ERROR, "Error: RGB is incompatible with median predictor\n");

  610.         return -1;

  611.     }

  612. 

  613.     ((uint8_t*)avctx->extradata)[0]= s->predictor | (s->decorrelate << 6);

  614.     ((uint8_t*)avctx->extradata)[1]= s->bitstream_bpp;

  615.     ((uint8_t*)avctx->extradata)[2]= s->interlaced ? 0x10 : 0x20;

  616.     if(s->context)

  617.         ((uint8_t*)avctx->extradata)[2]|= 0x40;

  618.     ((uint8_t*)avctx->extradata)[3]= 0;

  619.     s->avctx->extradata_size= 4;

  620. 

  621.     if(avctx->stats_in){

  622.         char *p= avctx->stats_in;

  623. 

  624.         for(i=0; i<3; i++)

  625.             for(j=0; j<256; j++)

  626.                 s->stats[i][j]= 1;

  627. 

  628.         for(;;){

  629.             for(i=0; i<3; i++){

  630.                 char *next;

  631. 

  632.                 for(j=0; j<256; j++){

  633.                     s->stats[i][j]+= strtol(p, &next, 0);

  634.                     if(next==p) return -1;

  635.                     p=next;

  636.                 }

  637.             }

  638.             if(p[0]==0 || p[1]==0 || p[2]==0) break;

  639.         }

  640.     }else{

  641.         for(i=0; i<3; i++)

  642.             for(j=0; j<256; j++){

  643.                 int d= FFMIN(j, 256-j);

  644. 

  645.                 s->stats[i][j]= 100000000/(d+1);

  646.             }

  647.     }

  648. 

  649.     for(i=0; i<3; i++){

  650.         generate_len_table(s->len[i], s->stats[i]);

  651. 

  652.         if(generate_bits_table(s->bits[i], s->len[i])<0){

  653.             return -1;

  654.         }

  655. 

  656.         s->avctx->extradata_size+=

  657.         store_table(s, s->len[i], &((uint8_t*)s->avctx->extradata)[s->avctx->extradata_size]);

  658.     }

  659. 

  660.     if(s->context){

  661.         for(i=0; i<3; i++){

  662.             int pels = s->width*s->height / (i?40:10);

  663.             for(j=0; j<256; j++){

  664.                 int d= FFMIN(j, 256-j);

  665.                 s->stats[i][j]= pels/(d+1);

  666.             }

  667.         }

  668.     }else{

  669.         for(i=0; i<3; i++)

  670.             for(j=0; j<256; j++)

  671.                 s->stats[i][j]= 0;

  672.     }

  673. 

  674. //    printf("pred:%d bpp:%d hbpp:%d il:%d\n", s->predictor, s->bitstream_bpp, avctx->bits_per_coded_sample, s->interlaced);

  675. 

  676.     alloc_temp(s);

  677. 

  678.     s->picture_number=0;

  679. 

  680.     return 0;

  681. }

  682. #endif /* CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER */

  683. 

  684. /* TODO instead of restarting the read when the code isn't in the first level

  685.  * of the joint table, jump into the 2nd level of the individual table. */

  686. #define READ_2PIX(dst0, dst1, plane1){\

  687.     uint16_t code = get_vlc2(&s->gb, s->vlc[3+plane1].table, VLC_BITS, 1);\

  688.     if(code != 0xffff){\

  689.         dst0 = code>>8;\

  690.         dst1 = code;\

  691.     }else{\

  692.         dst0 = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);\

  693.         dst1 = get_vlc2(&s->gb, s->vlc[plane1].table, VLC_BITS, 3);\

  694.     }\

  695. }

  696. 

  697. static void decode_422_bitstream(HYuvContext *s, int count){

  698.     int i;

  699. 

  700.     count/=2;

  701. 

  702.     if(count >= (get_bits_left(&s->gb))/(31*4)){

  703.         for(i=0; i<count && get_bits_count(&s->gb) < s->gb.size_in_bits; i++){

  704.             READ_2PIX(s->temp[0][2*i  ], s->temp[1][i], 1);

  705.             READ_2PIX(s->temp[0][2*i+1], s->temp[2][i], 2);

  706.         }

  707.     }else{

  708.         for(i=0; i<count; i++){

  709.             READ_2PIX(s->temp[0][2*i  ], s->temp[1][i], 1);

  710.             READ_2PIX(s->temp[0][2*i+1], s->temp[2][i], 2);

  711.         }

  712.     }

  713. }

  714. 

  715. static void decode_gray_bitstream(HYuvContext *s, int count){

  716.     int i;

  717. 

  718.     count/=2;

  719. 

  720.     if(count >= (get_bits_left(&s->gb))/(31*2)){

  721.         for(i=0; i<count && get_bits_count(&s->gb) < s->gb.size_in_bits; i++){

  722.             READ_2PIX(s->temp[0][2*i  ], s->temp[0][2*i+1], 0);

  723.         }

  724.     }else{

  725.         for(i=0; i<count; i++){

  726.             READ_2PIX(s->temp[0][2*i  ], s->temp[0][2*i+1], 0);

  727.         }

  728.     }

  729. }

  730. 

  731. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  732. static int encode_422_bitstream(HYuvContext *s, int offset, int count){

  733.     int i;

  734.     const uint8_t *y = s->temp[0] + offset;

  735.     const uint8_t *u = s->temp[1] + offset/2;

  736.     const uint8_t *v = s->temp[2] + offset/2;

  737. 

  738.     if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < 2*4*count){

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

  740.         return -1;

  741.     }

  742. 

  743. #define LOAD4\

  744.             int y0 = y[2*i];\

  745.             int y1 = y[2*i+1];\

  746.             int u0 = u[i];\

  747.             int v0 = v[i];

  748. 

  749.     count/=2;

  750.     if(s->flags&CODEC_FLAG_PASS1){

  751.         for(i=0; i<count; i++){

  752.             LOAD4;

  753.             s->stats[0][y0]++;

  754.             s->stats[1][u0]++;

  755.             s->stats[0][y1]++;

  756.             s->stats[2][v0]++;

  757.         }

  758.     }

  759.     if(s->avctx->flags2&CODEC_FLAG2_NO_OUTPUT)

  760.         return 0;

  761.     if(s->context){

  762.         for(i=0; i<count; i++){

  763.             LOAD4;

  764.             s->stats[0][y0]++;

  765.             put_bits(&s->pb, s->len[0][y0], s->bits[0][y0]);

  766.             s->stats[1][u0]++;

  767.             put_bits(&s->pb, s->len[1][u0], s->bits[1][u0]);

  768.             s->stats[0][y1]++;

  769.             put_bits(&s->pb, s->len[0][y1], s->bits[0][y1]);

  770.             s->stats[2][v0]++;

  771.             put_bits(&s->pb, s->len[2][v0], s->bits[2][v0]);

  772.         }

  773.     }else{

  774.         for(i=0; i<count; i++){

  775.             LOAD4;

  776.             put_bits(&s->pb, s->len[0][y0], s->bits[0][y0]);

  777.             put_bits(&s->pb, s->len[1][u0], s->bits[1][u0]);

  778.             put_bits(&s->pb, s->len[0][y1], s->bits[0][y1]);

  779.             put_bits(&s->pb, s->len[2][v0], s->bits[2][v0]);

  780.         }

  781.     }

  782.     return 0;

  783. }

  784. 

  785. static int encode_gray_bitstream(HYuvContext *s, int count){

  786.     int i;

  787. 

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

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

  790.         return -1;

  791.     }

  792. 

  793. #define LOAD2\

  794.             int y0 = s->temp[0][2*i];\

  795.             int y1 = s->temp[0][2*i+1];

  796. #define STAT2\

  797.             s->stats[0][y0]++;\

  798.             s->stats[0][y1]++;

  799. #define WRITE2\

  800.             put_bits(&s->pb, s->len[0][y0], s->bits[0][y0]);\

  801.             put_bits(&s->pb, s->len[0][y1], s->bits[0][y1]);

  802. 

  803.     count/=2;

  804.     if(s->flags&CODEC_FLAG_PASS1){

  805.         for(i=0; i<count; i++){

  806.             LOAD2;

  807.             STAT2;

  808.         }

  809.     }

  810.     if(s->avctx->flags2&CODEC_FLAG2_NO_OUTPUT)

  811.         return 0;

  812. 

  813.     if(s->context){

  814.         for(i=0; i<count; i++){

  815.             LOAD2;

  816.             STAT2;

  817.             WRITE2;

  818.         }

  819.     }else{

  820.         for(i=0; i<count; i++){

  821.             LOAD2;

  822.             WRITE2;

  823.         }

  824.     }

  825.     return 0;

  826. }

  827. #endif /* CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER */

  828. 

  829. static av_always_inline void decode_bgr_1(HYuvContext *s, int count, int decorrelate, int alpha){

  830.     int i;

  831.     for(i=0; i<count; i++){

  832.         int code = get_vlc2(&s->gb, s->vlc[3].table, VLC_BITS, 1);

  833.         if(code != -1){

  834.             *(uint32_t*)&s->temp[0][4*i] = s->pix_bgr_map[code];

  835.         }else if(decorrelate){

  836.             s->temp[0][4*i+G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);

  837.             s->temp[0][4*i+B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3) + s->temp[0][4*i+G];

  838.             s->temp[0][4*i+R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3) + s->temp[0][4*i+G];

  839.         }else{

  840.             s->temp[0][4*i+B] = get_vlc2(&s->gb, s->vlc[0].table, VLC_BITS, 3);

  841.             s->temp[0][4*i+G] = get_vlc2(&s->gb, s->vlc[1].table, VLC_BITS, 3);

  842.             s->temp[0][4*i+R] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);

  843.         }

  844.         if(alpha)

  845.             s->temp[0][4*i+A] = get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3);

  846.     }

  847. }

  848. 

  849. static void decode_bgr_bitstream(HYuvContext *s, int count){

  850.     if(s->decorrelate){

  851.         if(s->bitstream_bpp==24)

  852.             decode_bgr_1(s, count, 1, 0);

  853.         else

  854.             decode_bgr_1(s, count, 1, 1);

  855.     }else{

  856.         if(s->bitstream_bpp==24)

  857.             decode_bgr_1(s, count, 0, 0);

  858.         else

  859.             decode_bgr_1(s, count, 0, 1);

  860.     }

  861. }

  862. 

  863. static int encode_bgr_bitstream(HYuvContext *s, int count){

  864.     int i;

  865. 

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

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

  868.         return -1;

  869.     }

  870. 

  871. #define LOAD3\

  872.             int g= s->temp[0][4*i+G];\

  873.             int b= (s->temp[0][4*i+B] - g) & 0xff;\

  874.             int r= (s->temp[0][4*i+R] - g) & 0xff;

  875. #define STAT3\

  876.             s->stats[0][b]++;\

  877.             s->stats[1][g]++;\

  878.             s->stats[2][r]++;

  879. #define WRITE3\

  880.             put_bits(&s->pb, s->len[1][g], s->bits[1][g]);\

  881.             put_bits(&s->pb, s->len[0][b], s->bits[0][b]);\

  882.             put_bits(&s->pb, s->len[2][r], s->bits[2][r]);

  883. 

  884.     if((s->flags&CODEC_FLAG_PASS1) && (s->avctx->flags2&CODEC_FLAG2_NO_OUTPUT)){

  885.         for(i=0; i<count; i++){

  886.             LOAD3;

  887.             STAT3;

  888.         }

  889.     }else if(s->context || (s->flags&CODEC_FLAG_PASS1)){

  890.         for(i=0; i<count; i++){

  891.             LOAD3;

  892.             STAT3;

  893.             WRITE3;

  894.         }

  895.     }else{

  896.         for(i=0; i<count; i++){

  897.             LOAD3;

  898.             WRITE3;

  899.         }

  900.     }

  901.     return 0;

  902. }

  903. 

  904. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

  905. static void draw_slice(HYuvContext *s, int y){

  906.     int h, cy;

  907.     int offset[4];

  908. 

  909.     if(s->avctx->draw_horiz_band==NULL)

  910.         return;

  911. 

  912.     h= y - s->last_slice_end;

  913.     y -= h;

  914. 

  915.     if(s->bitstream_bpp==12){

  916.         cy= y>>1;

  917.     }else{

  918.         cy= y;

  919.     }

  920. 

  921.     offset[0] = s->picture.linesize[0]*y;

  922.     offset[1] = s->picture.linesize[1]*cy;

  923.     offset[2] = s->picture.linesize[2]*cy;

  924.     offset[3] = 0;

  925.     emms_c();

  926. 

  927.     s->avctx->draw_horiz_band(s->avctx, &s->picture, offset, y, 3, h);

  928. 

  929.     s->last_slice_end= y + h;

  930. }

  931. 

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

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

  934.     int buf_size = avpkt->size;

  935.     HYuvContext *s = avctx->priv_data;

  936.     const int width= s->width;

  937.     const int width2= s->width>>1;

  938.     const int height= s->height;

  939.     int fake_ystride, fake_ustride, fake_vstride;

  940.     AVFrame * const p= &s->picture;

  941.     int table_size= 0;

  942. 

  943.     AVFrame *picture = data;

  944. 

  945.     av_fast_malloc(&s->bitstream_buffer, &s->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  946.     if (!s->bitstream_buffer)

  947.         return AVERROR(ENOMEM);

  948. 

  949.     memset(s->bitstream_buffer + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  950.     s->dsp.bswap_buf((uint32_t*)s->bitstream_buffer, (const uint32_t*)buf, buf_size/4);

  951. 

  952.     if(p->data[0])

  953.         avctx->release_buffer(avctx, p);

  954. 

  955.     p->reference= 0;

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

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

  958.         return -1;

  959.     }

  960. 

  961.     if(s->context){

  962.         table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);

  963.         if(table_size < 0)

  964.             return -1;

  965.     }

  966. 

  967.     if((unsigned)(buf_size-table_size) >= INT_MAX/8)

  968.         return -1;

  969. 

  970.     init_get_bits(&s->gb, s->bitstream_buffer+table_size, (buf_size-table_size)*8);

  971. 

  972.     fake_ystride= s->interlaced ? p->linesize[0]*2  : p->linesize[0];

  973.     fake_ustride= s->interlaced ? p->linesize[1]*2  : p->linesize[1];

  974.     fake_vstride= s->interlaced ? p->linesize[2]*2  : p->linesize[2];

  975. 

  976.     s->last_slice_end= 0;

  977. 

  978.     if(s->bitstream_bpp<24){

  979.         int y, cy;

  980.         int lefty, leftu, leftv;

  981.         int lefttopy, lefttopu, lefttopv;

  982. 

  983.         if(s->yuy2){

  984.             p->data[0][3]= get_bits(&s->gb, 8);

  985.             p->data[0][2]= get_bits(&s->gb, 8);

  986.             p->data[0][1]= get_bits(&s->gb, 8);

  987.             p->data[0][0]= get_bits(&s->gb, 8);

  988. 

  989.             av_log(avctx, AV_LOG_ERROR, "YUY2 output is not implemented yet\n");

  990.             return -1;

  991.         }else{

  992. 

  993.             leftv= p->data[2][0]= get_bits(&s->gb, 8);

  994.             lefty= p->data[0][1]= get_bits(&s->gb, 8);

  995.             leftu= p->data[1][0]= get_bits(&s->gb, 8);

  996.                    p->data[0][0]= get_bits(&s->gb, 8);

  997. 

  998.             switch(s->predictor){

  999.             case LEFT:

  1000.             case PLANE:

  1001.                 decode_422_bitstream(s, width-2);

  1002.                 lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);

  1003.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1004.                     leftu= s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2-1, leftu);

  1005.                     leftv= s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2-1, leftv);

  1006.                 }

  1007. 

  1008.                 for(cy=y=1; y<s->height; y++,cy++){

  1009.                     uint8_t *ydst, *udst, *vdst;

  1010. 

  1011.                     if(s->bitstream_bpp==12){

  1012.                         decode_gray_bitstream(s, width);

  1013. 

  1014.                         ydst= p->data[0] + p->linesize[0]*y;

  1015. 

  1016.                         lefty= s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);

  1017.                         if(s->predictor == PLANE){

  1018.                             if(y>s->interlaced)

  1019.                                 s->dsp.add_bytes(ydst, ydst - fake_ystride, width);

  1020.                         }

  1021.                         y++;

  1022.                         if(y>=s->height) break;

  1023.                     }

  1024. 

  1025.                     draw_slice(s, y);

  1026. 

  1027.                     ydst= p->data[0] + p->linesize[0]*y;

  1028.                     udst= p->data[1] + p->linesize[1]*cy;

  1029.                     vdst= p->data[2] + p->linesize[2]*cy;

  1030. 

  1031.                     decode_422_bitstream(s, width);

  1032.                     lefty= s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);

  1033.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1034.                         leftu= s->dsp.add_hfyu_left_prediction(udst, s->temp[1], width2, leftu);

  1035.                         leftv= s->dsp.add_hfyu_left_prediction(vdst, s->temp[2], width2, leftv);

  1036.                     }

  1037.                     if(s->predictor == PLANE){

  1038.                         if(cy>s->interlaced){

  1039.                             s->dsp.add_bytes(ydst, ydst - fake_ystride, width);

  1040.                             if(!(s->flags&CODEC_FLAG_GRAY)){

  1041.                                 s->dsp.add_bytes(udst, udst - fake_ustride, width2);

  1042.                                 s->dsp.add_bytes(vdst, vdst - fake_vstride, width2);

  1043.                             }

  1044.                         }

  1045.                     }

  1046.                 }

  1047.                 draw_slice(s, height);

  1048. 

  1049.                 break;

  1050.             case MEDIAN:

  1051.                 /* first line except first 2 pixels is left predicted */

  1052.                 decode_422_bitstream(s, width-2);

  1053.                 lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);

  1054.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1055.                     leftu= s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2-1, leftu);

  1056.                     leftv= s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2-1, leftv);

  1057.                 }

  1058. 

  1059.                 cy=y=1;

  1060. 

  1061.                 /* second line is left predicted for interlaced case */

  1062.                 if(s->interlaced){

  1063.                     decode_422_bitstream(s, width);

  1064.                     lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + p->linesize[0], s->temp[0], width, lefty);

  1065.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1066.                         leftu= s->dsp.add_hfyu_left_prediction(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);

  1067.                         leftv= s->dsp.add_hfyu_left_prediction(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);

  1068.                     }

  1069.                     y++; cy++;

  1070.                 }

  1071. 

  1072.                 /* next 4 pixels are left predicted too */

  1073.                 decode_422_bitstream(s, 4);

  1074.                 lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + fake_ystride, s->temp[0], 4, lefty);

  1075.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1076.                     leftu= s->dsp.add_hfyu_left_prediction(p->data[1] + fake_ustride, s->temp[1], 2, leftu);

  1077.                     leftv= s->dsp.add_hfyu_left_prediction(p->data[2] + fake_vstride, s->temp[2], 2, leftv);

  1078.                 }

  1079. 

  1080.                 /* next line except the first 4 pixels is median predicted */

  1081.                 lefttopy= p->data[0][3];

  1082.                 decode_422_bitstream(s, width-4);

  1083.                 s->dsp.add_hfyu_median_prediction(p->data[0] + fake_ystride+4, p->data[0]+4, s->temp[0], width-4, &lefty, &lefttopy);

  1084.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1085.                     lefttopu= p->data[1][1];

  1086.                     lefttopv= p->data[2][1];

  1087.                     s->dsp.add_hfyu_median_prediction(p->data[1] + fake_ustride+2, p->data[1]+2, s->temp[1], width2-2, &leftu, &lefttopu);

  1088.                     s->dsp.add_hfyu_median_prediction(p->data[2] + fake_vstride+2, p->data[2]+2, s->temp[2], width2-2, &leftv, &lefttopv);

  1089.                 }

  1090.                 y++; cy++;

  1091. 

  1092.                 for(; y<height; y++,cy++){

  1093.                     uint8_t *ydst, *udst, *vdst;

  1094. 

  1095.                     if(s->bitstream_bpp==12){

  1096.                         while(2*cy > y){

  1097.                             decode_gray_bitstream(s, width);

  1098.                             ydst= p->data[0] + p->linesize[0]*y;

  1099.                             s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);

  1100.                             y++;

  1101.                         }

  1102.                         if(y>=height) break;

  1103.                     }

  1104.                     draw_slice(s, y);

  1105. 

  1106.                     decode_422_bitstream(s, width);

  1107. 

  1108.                     ydst= p->data[0] + p->linesize[0]*y;

  1109.                     udst= p->data[1] + p->linesize[1]*cy;

  1110.                     vdst= p->data[2] + p->linesize[2]*cy;

  1111. 

  1112.                     s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);

  1113.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1114.                         s->dsp.add_hfyu_median_prediction(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);

  1115.                         s->dsp.add_hfyu_median_prediction(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);

  1116.                     }

  1117.                 }

  1118. 

  1119.                 draw_slice(s, height);

  1120.                 break;

  1121.             }

  1122.         }

  1123.     }else{

  1124.         int y;

  1125.         int leftr, leftg, leftb, lefta;

  1126.         const int last_line= (height-1)*p->linesize[0];

  1127. 

  1128.         if(s->bitstream_bpp==32){

  1129.             lefta= p->data[0][last_line+A]= get_bits(&s->gb, 8);

  1130.             leftr= p->data[0][last_line+R]= get_bits(&s->gb, 8);

  1131.             leftg= p->data[0][last_line+G]= get_bits(&s->gb, 8);

  1132.             leftb= p->data[0][last_line+B]= get_bits(&s->gb, 8);

  1133.         }else{

  1134.             leftr= p->data[0][last_line+R]= get_bits(&s->gb, 8);

  1135.             leftg= p->data[0][last_line+G]= get_bits(&s->gb, 8);

  1136.             leftb= p->data[0][last_line+B]= get_bits(&s->gb, 8);

  1137.             lefta= p->data[0][last_line+A]= 255;

  1138.             skip_bits(&s->gb, 8);

  1139.         }

  1140. 

  1141.         if(s->bgr32){

  1142.             switch(s->predictor){

  1143.             case LEFT:

  1144.             case PLANE:

  1145.                 decode_bgr_bitstream(s, width-1);

  1146.                 s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + last_line+4, s->temp[0], width-1, &leftr, &leftg, &leftb, &lefta);

  1147. 

  1148.                 for(y=s->height-2; y>=0; y--){ //Yes it is stored upside down.

  1149.                     decode_bgr_bitstream(s, width);

  1150. 

  1151.                     s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + p->linesize[0]*y, s->temp[0], width, &leftr, &leftg, &leftb, &lefta);

  1152.                     if(s->predictor == PLANE){

  1153.                         if(s->bitstream_bpp!=32) lefta=0;

  1154.                         if((y&s->interlaced)==0 && y<s->height-1-s->interlaced){

  1155.                             s->dsp.add_bytes(p->data[0] + p->linesize[0]*y,

  1156.                                              p->data[0] + p->linesize[0]*y + fake_ystride, fake_ystride);

  1157.                         }

  1158.                     }

  1159.                 }

  1160.                 draw_slice(s, height); // just 1 large slice as this is not possible in reverse order

  1161.                 break;

  1162.             default:

  1163.                 av_log(avctx, AV_LOG_ERROR, "prediction type not supported!\n");

  1164.             }

  1165.         }else{

  1166. 

  1167.             av_log(avctx, AV_LOG_ERROR, "BGR24 output is not implemented yet\n");

  1168.             return -1;

  1169.         }

  1170.     }

  1171.     emms_c();

  1172. 

  1173.     *picture= *p;

  1174.     *data_size = sizeof(AVFrame);

  1175. 

  1176.     return (get_bits_count(&s->gb)+31)/32*4 + table_size;

  1177. }

  1178. #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */

  1179. 

  1180. static int common_end(HYuvContext *s){

  1181.     int i;

  1182. 

  1183.     for(i=0; i<3; i++){

  1184.         av_freep(&s->temp[i]);

  1185.     }

  1186.     return 0;

  1187. }

  1188. 

  1189. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

  1190. static av_cold int decode_end(AVCodecContext *avctx)

  1191. {

  1192.     HYuvContext *s = avctx->priv_data;

  1193.     int i;

  1194. 

  1195.     if (s->picture.data[0])

  1196.         avctx->release_buffer(avctx, &s->picture);

  1197. 

  1198.     common_end(s);

  1199.     av_freep(&s->bitstream_buffer);

  1200. 

  1201.     for(i=0; i<6; i++){

  1202.         free_vlc(&s->vlc[i]);

  1203.     }

  1204. 

  1205.     return 0;

  1206. }

  1207. #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */

  1208. 

  1209. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  1210. static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

  1211.     HYuvContext *s = avctx->priv_data;

  1212.     AVFrame *pict = data;

  1213.     const int width= s->width;

  1214.     const int width2= s->width>>1;

  1215.     const int height= s->height;

  1216.     const int fake_ystride= s->interlaced ? pict->linesize[0]*2  : pict->linesize[0];

  1217.     const int fake_ustride= s->interlaced ? pict->linesize[1]*2  : pict->linesize[1];

  1218.     const int fake_vstride= s->interlaced ? pict->linesize[2]*2  : pict->linesize[2];

  1219.     AVFrame * const p= &s->picture;

  1220.     int i, j, size=0;

  1221. 

  1222.     *p = *pict;

  1223.     p->pict_type= FF_I_TYPE;

  1224.     p->key_frame= 1;

  1225. 

  1226.     if(s->context){

  1227.         for(i=0; i<3; i++){

  1228.             generate_len_table(s->len[i], s->stats[i]);

  1229.             if(generate_bits_table(s->bits[i], s->len[i])<0)

  1230.                 return -1;

  1231.             size+= store_table(s, s->len[i], &buf[size]);

  1232.         }

  1233. 

  1234.         for(i=0; i<3; i++)

  1235.             for(j=0; j<256; j++)

  1236.                 s->stats[i][j] >>= 1;

  1237.     }

  1238. 

  1239.     init_put_bits(&s->pb, buf+size, buf_size-size);

  1240. 

  1241.     if(avctx->pix_fmt == PIX_FMT_YUV422P || avctx->pix_fmt == PIX_FMT_YUV420P){

  1242.         int lefty, leftu, leftv, y, cy;

  1243. 

  1244.         put_bits(&s->pb, 8, leftv= p->data[2][0]);

  1245.         put_bits(&s->pb, 8, lefty= p->data[0][1]);

  1246.         put_bits(&s->pb, 8, leftu= p->data[1][0]);

  1247.         put_bits(&s->pb, 8,        p->data[0][0]);

  1248. 

  1249.         lefty= sub_left_prediction(s, s->temp[0], p->data[0], width , 0);

  1250.         leftu= sub_left_prediction(s, s->temp[1], p->data[1], width2, 0);

  1251.         leftv= sub_left_prediction(s, s->temp[2], p->data[2], width2, 0);

  1252. 

  1253.         encode_422_bitstream(s, 2, width-2);

  1254. 

  1255.         if(s->predictor==MEDIAN){

  1256.             int lefttopy, lefttopu, lefttopv;

  1257.             cy=y=1;

  1258.             if(s->interlaced){

  1259.                 lefty= sub_left_prediction(s, s->temp[0], p->data[0]+p->linesize[0], width , lefty);

  1260.                 leftu= sub_left_prediction(s, s->temp[1], p->data[1]+p->linesize[1], width2, leftu);

  1261.                 leftv= sub_left_prediction(s, s->temp[2], p->data[2]+p->linesize[2], width2, leftv);

  1262. 

  1263.                 encode_422_bitstream(s, 0, width);

  1264.                 y++; cy++;

  1265.             }

  1266. 

  1267.             lefty= sub_left_prediction(s, s->temp[0], p->data[0]+fake_ystride, 4, lefty);

  1268.             leftu= sub_left_prediction(s, s->temp[1], p->data[1]+fake_ustride, 2, leftu);

  1269.             leftv= sub_left_prediction(s, s->temp[2], p->data[2]+fake_vstride, 2, leftv);

  1270. 

  1271.             encode_422_bitstream(s, 0, 4);

  1272. 

  1273.             lefttopy= p->data[0][3];

  1274.             lefttopu= p->data[1][1];

  1275.             lefttopv= p->data[2][1];

  1276.             s->dsp.sub_hfyu_median_prediction(s->temp[0], p->data[0]+4, p->data[0] + fake_ystride+4, width-4 , &lefty, &lefttopy);

  1277.             s->dsp.sub_hfyu_median_prediction(s->temp[1], p->data[1]+2, p->data[1] + fake_ustride+2, width2-2, &leftu, &lefttopu);

  1278.             s->dsp.sub_hfyu_median_prediction(s->temp[2], p->data[2]+2, p->data[2] + fake_vstride+2, width2-2, &leftv, &lefttopv);

  1279.             encode_422_bitstream(s, 0, width-4);

  1280.             y++; cy++;

  1281. 

  1282.             for(; y<height; y++,cy++){

  1283.                 uint8_t *ydst, *udst, *vdst;

  1284. 

  1285.                 if(s->bitstream_bpp==12){

  1286.                     while(2*cy > y){

  1287.                         ydst= p->data[0] + p->linesize[0]*y;

  1288.                         s->dsp.sub_hfyu_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);

  1289.                         encode_gray_bitstream(s, width);

  1290.                         y++;

  1291.                     }

  1292.                     if(y>=height) break;

  1293.                 }

  1294.                 ydst= p->data[0] + p->linesize[0]*y;

  1295.                 udst= p->data[1] + p->linesize[1]*cy;

  1296.                 vdst= p->data[2] + p->linesize[2]*cy;

  1297. 

  1298.                 s->dsp.sub_hfyu_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);

  1299.                 s->dsp.sub_hfyu_median_prediction(s->temp[1], udst - fake_ustride, udst, width2, &leftu, &lefttopu);

  1300.                 s->dsp.sub_hfyu_median_prediction(s->temp[2], vdst - fake_vstride, vdst, width2, &leftv, &lefttopv);

  1301. 

  1302.                 encode_422_bitstream(s, 0, width);

  1303.             }

  1304.         }else{

  1305.             for(cy=y=1; y<height; y++,cy++){

  1306.                 uint8_t *ydst, *udst, *vdst;

  1307. 

  1308.                 /* encode a luma only line & y++ */

  1309.                 if(s->bitstream_bpp==12){

  1310.                     ydst= p->data[0] + p->linesize[0]*y;

  1311. 

  1312.                     if(s->predictor == PLANE && s->interlaced < y){

  1313.                         s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);

  1314. 

  1315.                         lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);

  1316.                     }else{

  1317.                         lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);

  1318.                     }

  1319.                     encode_gray_bitstream(s, width);

  1320.                     y++;

  1321.                     if(y>=height) break;

  1322.                 }

  1323. 

  1324.                 ydst= p->data[0] + p->linesize[0]*y;

  1325.                 udst= p->data[1] + p->linesize[1]*cy;

  1326.                 vdst= p->data[2] + p->linesize[2]*cy;

  1327. 

  1328.                 if(s->predictor == PLANE && s->interlaced < cy){

  1329.                     s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);

  1330.                     s->dsp.diff_bytes(s->temp[2], udst, udst - fake_ustride, width2);

  1331.                     s->dsp.diff_bytes(s->temp[2] + width2, vdst, vdst - fake_vstride, width2);

  1332. 

  1333.                     lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);

  1334.                     leftu= sub_left_prediction(s, s->temp[1], s->temp[2], width2, leftu);

  1335.                     leftv= sub_left_prediction(s, s->temp[2], s->temp[2] + width2, width2, leftv);

  1336.                 }else{

  1337.                     lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);

  1338.                     leftu= sub_left_prediction(s, s->temp[1], udst, width2, leftu);

  1339.                     leftv= sub_left_prediction(s, s->temp[2], vdst, width2, leftv);

  1340.                 }

  1341. 

  1342.                 encode_422_bitstream(s, 0, width);

  1343.             }

  1344.         }

  1345.     }else if(avctx->pix_fmt == PIX_FMT_RGB32){

  1346.         uint8_t *data = p->data[0] + (height-1)*p->linesize[0];

  1347.         const int stride = -p->linesize[0];

  1348.         const int fake_stride = -fake_ystride;

  1349.         int y;

  1350.         int leftr, leftg, leftb;

  1351. 

  1352.         put_bits(&s->pb, 8, leftr= data[R]);

  1353.         put_bits(&s->pb, 8, leftg= data[G]);

  1354.         put_bits(&s->pb, 8, leftb= data[B]);

  1355.         put_bits(&s->pb, 8, 0);

  1356. 

  1357.         sub_left_prediction_bgr32(s, s->temp[0], data+4, width-1, &leftr, &leftg, &leftb);

  1358.         encode_bgr_bitstream(s, width-1);

  1359. 

  1360.         for(y=1; y<s->height; y++){

  1361.             uint8_t *dst = data + y*stride;

  1362.             if(s->predictor == PLANE && s->interlaced < y){

  1363.                 s->dsp.diff_bytes(s->temp[1], dst, dst - fake_stride, width*4);

  1364.                 sub_left_prediction_bgr32(s, s->temp[0], s->temp[1], width, &leftr, &leftg, &leftb);

  1365.             }else{

  1366.                 sub_left_prediction_bgr32(s, s->temp[0], dst, width, &leftr, &leftg, &leftb);

  1367.             }

  1368.             encode_bgr_bitstream(s, width);

  1369.         }

  1370.     }else{

  1371.         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");

  1372.     }

  1373.     emms_c();

  1374. 

  1375.     size+= (put_bits_count(&s->pb)+31)/8;

  1376.     put_bits(&s->pb, 16, 0);

  1377.     put_bits(&s->pb, 15, 0);

  1378.     size/= 4;

  1379. 

  1380.     if((s->flags&CODEC_FLAG_PASS1) && (s->picture_number&31)==0){

  1381.         int j;

  1382.         char *p= avctx->stats_out;

  1383.         char *end= p + 1024*30;

  1384.         for(i=0; i<3; i++){

  1385.             for(j=0; j<256; j++){

  1386.                 snprintf(p, end-p, "%"PRIu64" ", s->stats[i][j]);

  1387.                 p+= strlen(p);

  1388.                 s->stats[i][j]= 0;

  1389.             }

  1390.             snprintf(p, end-p, "\n");

  1391.             p++;

  1392.         }

  1393.     } else

  1394.         avctx->stats_out[0] = '\0';

  1395.     if(!(s->avctx->flags2 & CODEC_FLAG2_NO_OUTPUT)){

  1396.         flush_put_bits(&s->pb);

  1397.         s->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, size);

  1398.     }

  1399. 

  1400.     s->picture_number++;

  1401. 

  1402.     return size*4;

  1403. }

  1404. 

  1405. static av_cold int encode_end(AVCodecContext *avctx)

  1406. {

  1407.     HYuvContext *s = avctx->priv_data;

  1408. 

  1409.     common_end(s);

  1410. 

  1411.     av_freep(&avctx->extradata);

  1412.     av_freep(&avctx->stats_out);

  1413. 

  1414.     return 0;

  1415. }

  1416. #endif /* CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER */

  1417. 

  1418. #if CONFIG_HUFFYUV_DECODER

  1419. AVCodec ff_huffyuv_decoder = {

  1420.     "huffyuv",

  1421.     AVMEDIA_TYPE_VIDEO,

  1422.     CODEC_ID_HUFFYUV,

  1423.     sizeof(HYuvContext),

  1424.     decode_init,

  1425.     NULL,

  1426.     decode_end,

  1427.     decode_frame,

  1428.     CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,

  1429.     NULL,

  1430.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1431. };

  1432. #endif

  1433. 

  1434. #if CONFIG_FFVHUFF_DECODER

  1435. AVCodec ff_ffvhuff_decoder = {

  1436.     "ffvhuff",

  1437.     AVMEDIA_TYPE_VIDEO,

  1438.     CODEC_ID_FFVHUFF,

  1439.     sizeof(HYuvContext),

  1440.     decode_init,

  1441.     NULL,

  1442.     decode_end,

  1443.     decode_frame,

  1444.     CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,

  1445.     NULL,

  1446.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1447. };

  1448. #endif

  1449. 

  1450. #if CONFIG_HUFFYUV_ENCODER

  1451. AVCodec ff_huffyuv_encoder = {

  1452.     "huffyuv",

  1453.     AVMEDIA_TYPE_VIDEO,

  1454.     CODEC_ID_HUFFYUV,

  1455.     sizeof(HYuvContext),

  1456.     encode_init,

  1457.     encode_frame,

  1458.     encode_end,

  1459.     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},

  1460.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1461. };

  1462. #endif

  1463. 

  1464. #if CONFIG_FFVHUFF_ENCODER

  1465. AVCodec ff_ffvhuff_encoder = {

  1466.     "ffvhuff",

  1467.     AVMEDIA_TYPE_VIDEO,

  1468.     CODEC_ID_FFVHUFF,

  1469.     sizeof(HYuvContext),

  1470.     encode_init,

  1471.     encode_frame,

  1472.     encode_end,

  1473.     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},

  1474.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1475. };

  1476. #endif