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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 libavcodec/huffyuv.c

  28.  * huffyuv codec for libavcodec.

  29.  */

  30. 

  31. #include "avcodec.h"

  32. #include "bitstream.h"

  33. #include "dsputil.h"

  34. 

  35. #define VLC_BITS 11

  36. 

  37. #ifdef WORDS_BIGENDIAN

  38. #define B 3

  39. #define G 2

  40. #define R 1

  41. #else

  42. #define B 0

  43. #define G 1

  44. #define R 2

  45. #endif

  46. 

  47. typedef enum Predictor{

  48.     LEFT= 0,

  49.     PLANE,

  50.     MEDIAN,

  51. } Predictor;

  52. 

  53. typedef struct HYuvContext{

  54.     AVCodecContext *avctx;

  55.     Predictor predictor;

  56.     GetBitContext gb;

  57.     PutBitContext pb;

  58.     int interlaced;

  59.     int decorrelate;

  60.     int bitstream_bpp;

  61.     int version;

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

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

  64.     int width, height;

  65.     int flags;

  66.     int context;

  67.     int picture_number;

  68.     int last_slice_end;

  69.     uint8_t *temp[3];

  70.     uint64_t stats[3][256];

  71.     uint8_t len[3][256];

  72.     uint32_t bits[3][256];

  73.     uint32_t pix_bgr_map[1<<VLC_BITS];

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

  75.     AVFrame picture;

  76.     uint8_t *bitstream_buffer;

  77.     unsigned int bitstream_buffer_size;

  78.     DSPContext dsp;

  79. }HYuvContext;

  80. 

  81. static const unsigned char classic_shift_luma[] = {

  82.   34,36,35,69,135,232,9,16,10,24,11,23,12,16,13,10,14,8,15,8,

  83.   16,8,17,20,16,10,207,206,205,236,11,8,10,21,9,23,8,8,199,70,

  84.   69,68, 0

  85. };

  86. 

  87. static const unsigned char classic_shift_chroma[] = {

  88.   66,36,37,38,39,40,41,75,76,77,110,239,144,81,82,83,84,85,118,183,

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

  90.   214,245,116,83,82,49,80,79,78,77,44,75,41,40,39,38,37,36,34, 0

  91. };

  92. 

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

  94.     3,  9,  5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,

  95.    73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,

  96.    68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,

  97.    35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,

  98.    37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,

  99.    35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,

  100.    27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,

  101.    15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,

  102.    12, 17, 19, 13,  4,  9,  2, 11,  1,  7,  8,  0, 16,  3, 14,  6,

  103.    12, 10,  5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,

  104.    18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,

  105.    28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,

  106.    28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,

  107.    62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,

  108.    54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,

  109.    46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13,  7,  8,

  110. };

  111. 

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

  113.     3,  1,  2,  2,  2,  2,  3,  3,  7,  5,  7,  5,  8,  6, 11,  9,

  114.     7, 13, 11, 10,  9,  8,  7,  5,  9,  7,  6,  4,  7,  5,  8,  7,

  115.    11,  8, 13, 11, 19, 15, 22, 23, 20, 33, 32, 28, 27, 29, 51, 77,

  116.    43, 45, 76, 81, 46, 82, 75, 55, 56,144, 58, 80, 60, 74,147, 63,

  117.   143, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,

  118.    80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 27, 30, 21, 22,

  119.    17, 14,  5,  6,100, 54, 47, 50, 51, 53,106,107,108,109,110,111,

  120.   112,113,114,115,  4,117,118, 92, 94,121,122,  3,124,103,  2,  1,

  121.     0,129,130,131,120,119,126,125,136,137,138,139,140,141,142,134,

  122.   135,132,133,104, 64,101, 62, 57,102, 95, 93, 59, 61, 28, 97, 96,

  123.    52, 49, 48, 29, 32, 25, 24, 46, 23, 98, 45, 44, 43, 20, 42, 41,

  124.    19, 18, 99, 40, 15, 39, 38, 16, 13, 12, 11, 37, 10,  9,  8, 36,

  125.     7,128,127,105,123,116, 35, 34, 33,145, 31, 79, 42,146, 78, 26,

  126.    83, 48, 49, 50, 44, 47, 26, 31, 30, 18, 17, 19, 21, 24, 25, 13,

  127.    14, 16, 17, 18, 20, 21, 12, 14, 15,  9, 10,  6,  9,  6,  5,  8,

  128.     6, 12,  8, 10,  7,  9,  6,  4,  6,  2,  2,  3,  3,  3,  3,  2,

  129. };

  130. 

  131. static inline int add_left_prediction(uint8_t *dst, uint8_t *src, int w, int acc){

  132.     int i;

  133. 

  134.     for(i=0; i<w-1; i++){

  135.         acc+= src[i];

  136.         dst[i]= acc;

  137.         i++;

  138.         acc+= src[i];

  139.         dst[i]= acc;

  140.     }

  141. 

  142.     for(; i<w; i++){

  143.         acc+= src[i];

  144.         dst[i]= acc;

  145.     }

  146. 

  147.     return acc;

  148. }

  149. 

  150. static inline void add_left_prediction_bgr32(uint8_t *dst, uint8_t *src, int w, int *red, int *green, int *blue){

  151.     int i;

  152.     int r,g,b;

  153.     r= *red;

  154.     g= *green;

  155.     b= *blue;

  156. 

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

  158.         b+= src[4*i+B];

  159.         g+= src[4*i+G];

  160.         r+= src[4*i+R];

  161. 

  162.         dst[4*i+B]= b;

  163.         dst[4*i+G]= g;

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

  165.     }

  166. 

  167.     *red= r;

  168.     *green= g;

  169.     *blue= b;

  170. }

  171. 

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

  173.     int i;

  174.     if(w<32){

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

  176.             const int temp= src[i];

  177.             dst[i]= temp - left;

  178.             left= temp;

  179.         }

  180.         return left;

  181.     }else{

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

  183.             const int temp= src[i];

  184.             dst[i]= temp - left;

  185.             left= temp;

  186.         }

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

  188.         return src[w-1];

  189.     }

  190. }

  191. 

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

  193.     int i;

  194.     int r,g,b;

  195.     r= *red;

  196.     g= *green;

  197.     b= *blue;

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

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

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

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

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

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

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

  205.         r = rt;

  206.         g = gt;

  207.         b = bt;

  208.     }

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

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

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

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

  213. }

  214. 

  215. static void read_len_table(uint8_t *dst, GetBitContext *gb){

  216.     int i, val, repeat;

  217. 

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

  219.         repeat= get_bits(gb, 3);

  220.         val   = get_bits(gb, 5);

  221.         if(repeat==0)

  222.             repeat= get_bits(gb, 8);

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

  224.         while (repeat--)

  225.             dst[i++] = val;

  226.     }

  227. }

  228. 

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

  230.     int len, index;

  231.     uint32_t bits=0;

  232. 

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

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

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

  236.                 dst[index]= bits++;

  237.         }

  238.         if(bits & 1){

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

  240.             return -1;

  241.         }

  242.         bits >>= 1;

  243.     }

  244.     return 0;

  245. }

  246. 

  247. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  248. typedef struct {

  249.     uint64_t val;

  250.     int name;

  251. } HeapElem;

  252. 

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

  254. {

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

  256.         int child = root*2+1;

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

  258.             child++;

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

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

  261.             root = child;

  262.         } else

  263.             break;

  264.     }

  265. }

  266. 

  267. static void generate_len_table(uint8_t *dst, uint64_t *stats, int size){

  268.     HeapElem h[size];

  269.     int up[2*size];

  270.     int len[2*size];

  271.     int offset, i, next;

  272. 

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

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

  275.             h[i].name = i;

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

  277.         }

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

  279.             heap_sift(h, i, size);

  280. 

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

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

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

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

  285.             h[0].val = INT64_MAX;

  286.             heap_sift(h, 0, size);

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

  288.             h[0].name = next;

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

  290.             heap_sift(h, 0, size);

  291.         }

  292. 

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

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

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

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

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

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

  299.         }

  300.         if(i==size) break;

  301.     }

  302. }

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

  304. 

  305. static void generate_joint_tables(HYuvContext *s){

  306.     uint16_t symbols[1<<VLC_BITS];

  307.     uint16_t bits[1<<VLC_BITS];

  308.     uint8_t len[1<<VLC_BITS];

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

  310.         int p, i, y, u;

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

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

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

  314.                 int limit = VLC_BITS - len0;

  315.                 if(limit <= 0 || !len0)

  316.                     continue;

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

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

  319.                     if (len1 > limit || !len1)

  320.                         continue;

  321.                     assert(i < (1 << VLC_BITS));

  322.                     len[i] = len0 + len1;

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

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

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

  326.                         i++;

  327.                 }

  328.             }

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

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

  331.         }

  332.     }else{

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

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

  335.         int p0 = s->decorrelate;

  336.         int p1 = !s->decorrelate;

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

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

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

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

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

  342.             int limit0 = VLC_BITS - len0;

  343.             if (limit0 < 2 || !len0)

  344.                 continue;

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

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

  347.                 int limit1 = limit0 - len1;

  348.                 if (limit1 < 1 || !len1)

  349.                     continue;

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

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

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

  353.                     if (len2 > limit1 || !len2)

  354.                         continue;

  355.                     assert(i < (1 << VLC_BITS));

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

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

  358.                     if(s->decorrelate){

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

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

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

  362.                     }else{

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

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

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

  366.                     }

  367.                     i++;

  368.                 }

  369.             }

  370.         }

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

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

  373.     }

  374. }

  375. 

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

  377.     GetBitContext gb;

  378.     int i;

  379.     int ret;

  380. 

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

  382. 

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

  384.         read_len_table(s->len[i], &gb);

  385. 

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

  387.             return -1;

  388.         }

  389. #if 0

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

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

  392. }

  393. #endif

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

  395.         if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1, s->bits[i], 4, 4, 0)) < 0)

  396.             return ret;

  397.     }

  398. 

  399.     generate_joint_tables(s);

  400. 

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

  402. }

  403. 

  404. static int read_old_huffman_tables(HYuvContext *s){

  405. #if 1

  406.     GetBitContext gb;

  407.     int i;

  408.     int ret;

  409. 

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

  411.     read_len_table(s->len[0], &gb);

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

  413.     read_len_table(s->len[1], &gb);

  414. 

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

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

  417. 

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

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

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

  421.     }

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

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

  424. 

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

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

  427.         if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1, s->bits[i], 4, 4, 0)) < 0)

  428.             return ret;

  429.     }

  430. 

  431.     generate_joint_tables(s);

  432. 

  433.     return 0;

  434. #else

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

  436.     return -1;

  437. #endif

  438. }

  439. 

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

  441.     int i;

  442. 

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

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

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

  446.         }

  447.     }else{

  448.         for(i=0; i<2; i++){

  449.             s->temp[i]= av_malloc(4*s->width + 16);

  450.         }

  451.     }

  452. }

  453. 

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

  455.     HYuvContext *s = avctx->priv_data;

  456. 

  457.     s->avctx= avctx;

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

  459. 

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

  461. 

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

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

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

  465. 

  466.     return 0;

  467. }

  468. 

  469. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

  470. static av_cold int decode_init(AVCodecContext *avctx)

  471. {

  472.     HYuvContext *s = avctx->priv_data;

  473. 

  474.     common_init(avctx);

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

  476. 

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

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

  479. 

  480. s->bgr32=1;

  481. //if(avctx->extradata)

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

  483.     if(avctx->extradata_size){

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

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

  486.         else

  487.             s->version=2;

  488.     }else

  489.         s->version=0;

  490. 

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

  492.         int method, interlace;

  493. 

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

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

  496.         s->predictor= method&63;

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

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

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

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

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

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

  503. 

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

  505.             return -1;

  506.     }else{

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

  508.         case 1:

  509.             s->predictor= LEFT;

  510.             s->decorrelate= 0;

  511.             break;

  512.         case 2:

  513.             s->predictor= LEFT;

  514.             s->decorrelate= 1;

  515.             break;

  516.         case 3:

  517.             s->predictor= PLANE;

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

  519.             break;

  520.         case 4:

  521.             s->predictor= MEDIAN;

  522.             s->decorrelate= 0;

  523.             break;

  524.         default:

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

  526.             s->decorrelate= 0;

  527.             break;

  528.         }

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

  530.         s->context= 0;

  531. 

  532.         if(read_old_huffman_tables(s) < 0)

  533.             return -1;

  534.     }

  535. 

  536.     switch(s->bitstream_bpp){

  537.     case 12:

  538.         avctx->pix_fmt = PIX_FMT_YUV420P;

  539.         break;

  540.     case 16:

  541.         if(s->yuy2){

  542.             avctx->pix_fmt = PIX_FMT_YUYV422;

  543.         }else{

  544.             avctx->pix_fmt = PIX_FMT_YUV422P;

  545.         }

  546.         break;

  547.     case 24:

  548.     case 32:

  549.         if(s->bgr32){

  550.             avctx->pix_fmt = PIX_FMT_RGB32;

  551.         }else{

  552.             avctx->pix_fmt = PIX_FMT_BGR24;

  553.         }

  554.         break;

  555.     default:

  556.         assert(0);

  557.     }

  558. 

  559.     alloc_temp(s);

  560. 

  561. //    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);

  562. 

  563.     return 0;

  564. }

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

  566. 

  567. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

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

  569.     int i;

  570.     int index= 0;

  571. 

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

  573.         int val= len[i];

  574.         int repeat=0;

  575. 

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

  577.             repeat++;

  578. 

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

  580.         if(repeat>7){

  581.             buf[index++]= val;

  582.             buf[index++]= repeat;

  583.         }else{

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

  585.         }

  586.     }

  587. 

  588.     return index;

  589. }

  590. 

  591. static av_cold int encode_init(AVCodecContext *avctx)

  592. {

  593.     HYuvContext *s = avctx->priv_data;

  594.     int i, j;

  595. 

  596.     common_init(avctx);

  597. 

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

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

  600.     s->version=2;

  601. 

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

  603. 

  604.     switch(avctx->pix_fmt){

  605.     case PIX_FMT_YUV420P:

  606.         s->bitstream_bpp= 12;

  607.         break;

  608.     case PIX_FMT_YUV422P:

  609.         s->bitstream_bpp= 16;

  610.         break;

  611.     case PIX_FMT_RGB32:

  612.         s->bitstream_bpp= 24;

  613.         break;

  614.     default:

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

  616.         return -1;

  617.     }

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

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

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

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

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

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

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

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

  626.             return -1;

  627.         }

  628.     }else s->context= 0;

  629. 

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

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

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

  633.             return -1;

  634.         }

  635.         if(avctx->context_model){

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

  637.             return -1;

  638.         }

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

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

  641.     }

  642. 

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

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

  645.         return -1;

  646.     }

  647. 

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

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

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

  651.     if(s->context)

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

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

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

  655. 

  656.     if(avctx->stats_in){

  657.         char *p= avctx->stats_in;

  658. 

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

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

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

  662. 

  663.         for(;;){

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

  665.                 char *next;

  666. 

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

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

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

  670.                     p=next;

  671.                 }

  672.             }

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

  674.         }

  675.     }else{

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

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

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

  679. 

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

  681.             }

  682.     }

  683. 

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

  685.         generate_len_table(s->len[i], s->stats[i], 256);

  686. 

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

  688.             return -1;

  689.         }

  690. 

  691.         s->avctx->extradata_size+=

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

  693.     }

  694. 

  695.     if(s->context){

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

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

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

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

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

  701.             }

  702.         }

  703.     }else{

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

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

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

  707.     }

  708. 

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

  710. 

  711.     alloc_temp(s);

  712. 

  713.     s->picture_number=0;

  714. 

  715.     return 0;

  716. }

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

  718. 

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

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

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

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

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

  724.         dst0 = code>>8;\

  725.         dst1 = code;\

  726.     }else{\

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

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

  729.     }\

  730. }

  731. 

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

  733.     int i;

  734. 

  735.     count/=2;

  736. 

  737.     if(count >= (s->gb.size_in_bits - get_bits_count(&s->gb))/(31*4)){

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

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

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

  741.         }

  742.     }else{

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

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

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

  746.     }

  747.     }

  748. }

  749. 

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

  751.     int i;

  752. 

  753.     count/=2;

  754. 

  755.     if(count >= (s->gb.size_in_bits - get_bits_count(&s->gb))/(31*2)){

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

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

  758.         }

  759.     }else{

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

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

  762.     }

  763.     }

  764. }

  765. 

  766. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

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

  768.     int i;

  769. 

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

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

  772.         return -1;

  773.     }

  774. 

  775. #define LOAD4\

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

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

  778.             int u0 = s->temp[1][i];\

  779.             int v0 = s->temp[2][i];

  780. 

  781.     count/=2;

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

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

  784.             LOAD4;

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

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

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

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

  789.         }

  790.     }

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

  792.         return 0;

  793.     if(s->context){

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

  795.             LOAD4;

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

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

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

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

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

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

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

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

  804.         }

  805.     }else{

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

  807.             LOAD4;

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

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

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

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

  812.         }

  813.     }

  814.     return 0;

  815. }

  816. 

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

  818.     int i;

  819. 

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

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

  822.         return -1;

  823.     }

  824. 

  825. #define LOAD2\

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

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

  828. #define STAT2\

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

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

  831. #define WRITE2\

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

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

  834. 

  835.     count/=2;

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

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

  838.             LOAD2;

  839.             STAT2;

  840.         }

  841.     }

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

  843.         return 0;

  844. 

  845.     if(s->context){

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

  847.             LOAD2;

  848.             STAT2;

  849.             WRITE2;

  850.         }

  851.     }else{

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

  853.             LOAD2;

  854.             WRITE2;

  855.         }

  856.     }

  857.     return 0;

  858. }

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

  860. 

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

  862.     int i;

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

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

  865.         if(code != -1){

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

  867.         }else if(decorrelate){

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

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

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

  871.         }else{

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

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

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

  875.         }

  876.         if(alpha)

  877.             get_vlc2(&s->gb, s->vlc[2].table, VLC_BITS, 3); //?!

  878.     }

  879. }

  880. 

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

  882.     if(s->decorrelate){

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

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

  885.         else

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

  887.     }else{

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

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

  890.         else

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

  892.     }

  893. }

  894. 

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

  896.     int i;

  897. 

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

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

  900.         return -1;

  901.     }

  902. 

  903. #define LOAD3\

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

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

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

  907. #define STAT3\

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

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

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

  911. #define WRITE3\

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

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

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

  915. 

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

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

  918.             LOAD3;

  919.             STAT3;

  920.         }

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

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

  923.             LOAD3;

  924.             STAT3;

  925.             WRITE3;

  926.         }

  927.     }else{

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

  929.             LOAD3;

  930.             WRITE3;

  931.         }

  932.     }

  933.     return 0;

  934. }

  935. 

  936. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

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

  938.     int h, cy;

  939.     int offset[4];

  940. 

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

  942.         return;

  943. 

  944.     h= y - s->last_slice_end;

  945.     y -= h;

  946. 

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

  948.         cy= y>>1;

  949.     }else{

  950.         cy= y;

  951.     }

  952. 

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

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

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

  956.     offset[3] = 0;

  957.     emms_c();

  958. 

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

  960. 

  961.     s->last_slice_end= y + h;

  962. }

  963. 

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

  965.     HYuvContext *s = avctx->priv_data;

  966.     const int width= s->width;

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

  968.     const int height= s->height;

  969.     int fake_ystride, fake_ustride, fake_vstride;

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

  971.     int table_size= 0;

  972. 

  973.     AVFrame *picture = data;

  974. 

  975.     s->bitstream_buffer= av_fast_realloc(s->bitstream_buffer, &s->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

  976. 

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

  978. 

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

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

  981. 

  982.     p->reference= 0;

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

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

  985.         return -1;

  986.     }

  987. 

  988.     if(s->context){

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

  990.         if(table_size < 0)

  991.             return -1;

  992.     }

  993. 

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

  995.         return -1;

  996. 

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

  998. 

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

  1000.     fake_ustride= s->interlaced ? p->linesize[1]*2  : p->linesize[1];

  1001.     fake_vstride= s->interlaced ? p->linesize[2]*2  : p->linesize[2];

  1002. 

  1003.     s->last_slice_end= 0;

  1004. 

  1005.     if(s->bitstream_bpp<24){

  1006.         int y, cy;

  1007.         int lefty, leftu, leftv;

  1008.         int lefttopy, lefttopu, lefttopv;

  1009. 

  1010.         if(s->yuy2){

  1011.             p->data[0][3]= get_bits(&s->gb, 8);

  1012.             p->data[0][2]= get_bits(&s->gb, 8);

  1013.             p->data[0][1]= get_bits(&s->gb, 8);

  1014.             p->data[0][0]= get_bits(&s->gb, 8);

  1015. 

  1016.             av_log(avctx, AV_LOG_ERROR, "YUY2 output is not implemented yet\n");

  1017.             return -1;

  1018.         }else{

  1019. 

  1020.             leftv= p->data[2][0]= get_bits(&s->gb, 8);

  1021.             lefty= p->data[0][1]= get_bits(&s->gb, 8);

  1022.             leftu= p->data[1][0]= get_bits(&s->gb, 8);

  1023.                    p->data[0][0]= get_bits(&s->gb, 8);

  1024. 

  1025.             switch(s->predictor){

  1026.             case LEFT:

  1027.             case PLANE:

  1028.                 decode_422_bitstream(s, width-2);

  1029.                 lefty= add_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);

  1030.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1031.                     leftu= add_left_prediction(p->data[1] + 1, s->temp[1], width2-1, leftu);

  1032.                     leftv= add_left_prediction(p->data[2] + 1, s->temp[2], width2-1, leftv);

  1033.                 }

  1034. 

  1035.                 for(cy=y=1; y<s->height; y++,cy++){

  1036.                     uint8_t *ydst, *udst, *vdst;

  1037. 

  1038.                     if(s->bitstream_bpp==12){

  1039.                         decode_gray_bitstream(s, width);

  1040. 

  1041.                         ydst= p->data[0] + p->linesize[0]*y;

  1042. 

  1043.                         lefty= add_left_prediction(ydst, s->temp[0], width, lefty);

  1044.                         if(s->predictor == PLANE){

  1045.                             if(y>s->interlaced)

  1046.                                 s->dsp.add_bytes(ydst, ydst - fake_ystride, width);

  1047.                         }

  1048.                         y++;

  1049.                         if(y>=s->height) break;

  1050.                     }

  1051. 

  1052.                     draw_slice(s, y);

  1053. 

  1054.                     ydst= p->data[0] + p->linesize[0]*y;

  1055.                     udst= p->data[1] + p->linesize[1]*cy;

  1056.                     vdst= p->data[2] + p->linesize[2]*cy;

  1057. 

  1058.                     decode_422_bitstream(s, width);

  1059.                     lefty= add_left_prediction(ydst, s->temp[0], width, lefty);

  1060.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1061.                         leftu= add_left_prediction(udst, s->temp[1], width2, leftu);

  1062.                         leftv= add_left_prediction(vdst, s->temp[2], width2, leftv);

  1063.                     }

  1064.                     if(s->predictor == PLANE){

  1065.                         if(cy>s->interlaced){

  1066.                             s->dsp.add_bytes(ydst, ydst - fake_ystride, width);

  1067.                             if(!(s->flags&CODEC_FLAG_GRAY)){

  1068.                                 s->dsp.add_bytes(udst, udst - fake_ustride, width2);

  1069.                                 s->dsp.add_bytes(vdst, vdst - fake_vstride, width2);

  1070.                             }

  1071.                         }

  1072.                     }

  1073.                 }

  1074.                 draw_slice(s, height);

  1075. 

  1076.                 break;

  1077.             case MEDIAN:

  1078.                 /* first line except first 2 pixels is left predicted */

  1079.                 decode_422_bitstream(s, width-2);

  1080.                 lefty= add_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);

  1081.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1082.                     leftu= add_left_prediction(p->data[1] + 1, s->temp[1], width2-1, leftu);

  1083.                     leftv= add_left_prediction(p->data[2] + 1, s->temp[2], width2-1, leftv);

  1084.                 }

  1085. 

  1086.                 cy=y=1;

  1087. 

  1088.                 /* second line is left predicted for interlaced case */

  1089.                 if(s->interlaced){

  1090.                     decode_422_bitstream(s, width);

  1091.                     lefty= add_left_prediction(p->data[0] + p->linesize[0], s->temp[0], width, lefty);

  1092.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1093.                         leftu= add_left_prediction(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);

  1094.                         leftv= add_left_prediction(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);

  1095.                     }

  1096.                     y++; cy++;

  1097.                 }

  1098. 

  1099.                 /* next 4 pixels are left predicted too */

  1100.                 decode_422_bitstream(s, 4);

  1101.                 lefty= add_left_prediction(p->data[0] + fake_ystride, s->temp[0], 4, lefty);

  1102.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1103.                     leftu= add_left_prediction(p->data[1] + fake_ustride, s->temp[1], 2, leftu);

  1104.                     leftv= add_left_prediction(p->data[2] + fake_vstride, s->temp[2], 2, leftv);

  1105.                 }

  1106. 

  1107.                 /* next line except the first 4 pixels is median predicted */

  1108.                 lefttopy= p->data[0][3];

  1109.                 decode_422_bitstream(s, width-4);

  1110.                 s->dsp.add_hfyu_median_prediction(p->data[0] + fake_ystride+4, p->data[0]+4, s->temp[0], width-4, &lefty, &lefttopy);

  1111.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1112.                     lefttopu= p->data[1][1];

  1113.                     lefttopv= p->data[2][1];

  1114.                     s->dsp.add_hfyu_median_prediction(p->data[1] + fake_ustride+2, p->data[1]+2, s->temp[1], width2-2, &leftu, &lefttopu);

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

  1116.                 }

  1117.                 y++; cy++;

  1118. 

  1119.                 for(; y<height; y++,cy++){

  1120.                     uint8_t *ydst, *udst, *vdst;

  1121. 

  1122.                     if(s->bitstream_bpp==12){

  1123.                         while(2*cy > y){

  1124.                             decode_gray_bitstream(s, width);

  1125.                             ydst= p->data[0] + p->linesize[0]*y;

  1126.                             s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);

  1127.                             y++;

  1128.                         }

  1129.                         if(y>=height) break;

  1130.                     }

  1131.                     draw_slice(s, y);

  1132. 

  1133.                     decode_422_bitstream(s, width);

  1134. 

  1135.                     ydst= p->data[0] + p->linesize[0]*y;

  1136.                     udst= p->data[1] + p->linesize[1]*cy;

  1137.                     vdst= p->data[2] + p->linesize[2]*cy;

  1138. 

  1139.                     s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);

  1140.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1141.                         s->dsp.add_hfyu_median_prediction(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);

  1142.                         s->dsp.add_hfyu_median_prediction(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);

  1143.                     }

  1144.                 }

  1145. 

  1146.                 draw_slice(s, height);

  1147.                 break;

  1148.             }

  1149.         }

  1150.     }else{

  1151.         int y;

  1152.         int leftr, leftg, leftb;

  1153.         const int last_line= (height-1)*p->linesize[0];

  1154. 

  1155.         if(s->bitstream_bpp==32){

  1156.             skip_bits(&s->gb, 8);

  1157.             leftr= p->data[0][last_line+R]= get_bits(&s->gb, 8);

  1158.             leftg= p->data[0][last_line+G]= get_bits(&s->gb, 8);

  1159.             leftb= p->data[0][last_line+B]= get_bits(&s->gb, 8);

  1160.         }else{

  1161.             leftr= p->data[0][last_line+R]= get_bits(&s->gb, 8);

  1162.             leftg= p->data[0][last_line+G]= get_bits(&s->gb, 8);

  1163.             leftb= p->data[0][last_line+B]= get_bits(&s->gb, 8);

  1164.             skip_bits(&s->gb, 8);

  1165.         }

  1166. 

  1167.         if(s->bgr32){

  1168.             switch(s->predictor){

  1169.             case LEFT:

  1170.             case PLANE:

  1171.                 decode_bgr_bitstream(s, width-1);

  1172.                 add_left_prediction_bgr32(p->data[0] + last_line+4, s->temp[0], width-1, &leftr, &leftg, &leftb);

  1173. 

  1174.                 for(y=s->height-2; y>=0; y--){ //Yes it is stored upside down.

  1175.                     decode_bgr_bitstream(s, width);

  1176. 

  1177.                     add_left_prediction_bgr32(p->data[0] + p->linesize[0]*y, s->temp[0], width, &leftr, &leftg, &leftb);

  1178.                     if(s->predictor == PLANE){

  1179.                         if((y&s->interlaced)==0 && y<s->height-1-s->interlaced){

  1180.                             s->dsp.add_bytes(p->data[0] + p->linesize[0]*y,

  1181.                                              p->data[0] + p->linesize[0]*y + fake_ystride, fake_ystride);

  1182.                         }

  1183.                     }

  1184.                 }

  1185.                 draw_slice(s, height); // just 1 large slice as this is not possible in reverse order

  1186.                 break;

  1187.             default:

  1188.                 av_log(avctx, AV_LOG_ERROR, "prediction type not supported!\n");

  1189.             }

  1190.         }else{

  1191. 

  1192.             av_log(avctx, AV_LOG_ERROR, "BGR24 output is not implemented yet\n");

  1193.             return -1;

  1194.         }

  1195.     }

  1196.     emms_c();

  1197. 

  1198.     *picture= *p;

  1199.     *data_size = sizeof(AVFrame);

  1200. 

  1201.     return (get_bits_count(&s->gb)+31)/32*4 + table_size;

  1202. }

  1203. #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */

  1204. 

  1205. static int common_end(HYuvContext *s){

  1206.     int i;

  1207. 

  1208.     for(i=0; i<3; i++){

  1209.         av_freep(&s->temp[i]);

  1210.     }

  1211.     return 0;

  1212. }

  1213. 

  1214. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

  1215. static av_cold int decode_end(AVCodecContext *avctx)

  1216. {

  1217.     HYuvContext *s = avctx->priv_data;

  1218.     int i;

  1219. 

  1220.     common_end(s);

  1221.     av_freep(&s->bitstream_buffer);

  1222. 

  1223.     for(i=0; i<6; i++){

  1224.         free_vlc(&s->vlc[i]);

  1225.     }

  1226. 

  1227.     return 0;

  1228. }

  1229. #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */

  1230. 

  1231. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  1232. static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

  1233.     HYuvContext *s = avctx->priv_data;

  1234.     AVFrame *pict = data;

  1235.     const int width= s->width;

  1236.     const int width2= s->width>>1;

  1237.     const int height= s->height;

  1238.     const int fake_ystride= s->interlaced ? pict->linesize[0]*2  : pict->linesize[0];

  1239.     const int fake_ustride= s->interlaced ? pict->linesize[1]*2  : pict->linesize[1];

  1240.     const int fake_vstride= s->interlaced ? pict->linesize[2]*2  : pict->linesize[2];

  1241.     AVFrame * const p= &s->picture;

  1242.     int i, j, size=0;

  1243. 

  1244.     *p = *pict;

  1245.     p->pict_type= FF_I_TYPE;

  1246.     p->key_frame= 1;

  1247. 

  1248.     if(s->context){

  1249.         for(i=0; i<3; i++){

  1250.             generate_len_table(s->len[i], s->stats[i], 256);

  1251.             if(generate_bits_table(s->bits[i], s->len[i])<0)

  1252.                 return -1;

  1253.             size+= store_table(s, s->len[i], &buf[size]);

  1254.         }

  1255. 

  1256.         for(i=0; i<3; i++)

  1257.             for(j=0; j<256; j++)

  1258.                 s->stats[i][j] >>= 1;

  1259.     }

  1260. 

  1261.     init_put_bits(&s->pb, buf+size, buf_size-size);

  1262. 

  1263.     if(avctx->pix_fmt == PIX_FMT_YUV422P || avctx->pix_fmt == PIX_FMT_YUV420P){

  1264.         int lefty, leftu, leftv, y, cy;

  1265. 

  1266.         put_bits(&s->pb, 8, leftv= p->data[2][0]);

  1267.         put_bits(&s->pb, 8, lefty= p->data[0][1]);

  1268.         put_bits(&s->pb, 8, leftu= p->data[1][0]);

  1269.         put_bits(&s->pb, 8,        p->data[0][0]);

  1270. 

  1271.         lefty= sub_left_prediction(s, s->temp[0], p->data[0]+2, width-2 , lefty);

  1272.         leftu= sub_left_prediction(s, s->temp[1], p->data[1]+1, width2-1, leftu);

  1273.         leftv= sub_left_prediction(s, s->temp[2], p->data[2]+1, width2-1, leftv);

  1274. 

  1275.         encode_422_bitstream(s, width-2);

  1276. 

  1277.         if(s->predictor==MEDIAN){

  1278.             int lefttopy, lefttopu, lefttopv;

  1279.             cy=y=1;

  1280.             if(s->interlaced){

  1281.                 lefty= sub_left_prediction(s, s->temp[0], p->data[0]+p->linesize[0], width , lefty);

  1282.                 leftu= sub_left_prediction(s, s->temp[1], p->data[1]+p->linesize[1], width2, leftu);

  1283.                 leftv= sub_left_prediction(s, s->temp[2], p->data[2]+p->linesize[2], width2, leftv);

  1284. 

  1285.                 encode_422_bitstream(s, width);

  1286.                 y++; cy++;

  1287.             }

  1288. 

  1289.             lefty= sub_left_prediction(s, s->temp[0], p->data[0]+fake_ystride, 4, lefty);

  1290.             leftu= sub_left_prediction(s, s->temp[1], p->data[1]+fake_ustride, 2, leftu);

  1291.             leftv= sub_left_prediction(s, s->temp[2], p->data[2]+fake_vstride, 2, leftv);

  1292. 

  1293.             encode_422_bitstream(s, 4);

  1294. 

  1295.             lefttopy= p->data[0][3];

  1296.             lefttopu= p->data[1][1];

  1297.             lefttopv= p->data[2][1];

  1298.             s->dsp.sub_hfyu_median_prediction(s->temp[0], p->data[0]+4, p->data[0] + fake_ystride+4, width-4 , &lefty, &lefttopy);

  1299.             s->dsp.sub_hfyu_median_prediction(s->temp[1], p->data[1]+2, p->data[1] + fake_ustride+2, width2-2, &leftu, &lefttopu);

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

  1301.             encode_422_bitstream(s, width-4);

  1302.             y++; cy++;

  1303. 

  1304.             for(; y<height; y++,cy++){

  1305.                 uint8_t *ydst, *udst, *vdst;

  1306. 

  1307.                 if(s->bitstream_bpp==12){

  1308.                     while(2*cy > y){

  1309.                         ydst= p->data[0] + p->linesize[0]*y;

  1310.                         s->dsp.sub_hfyu_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);

  1311.                         encode_gray_bitstream(s, width);

  1312.                         y++;

  1313.                     }

  1314.                     if(y>=height) break;

  1315.                 }

  1316.                 ydst= p->data[0] + p->linesize[0]*y;

  1317.                 udst= p->data[1] + p->linesize[1]*cy;

  1318.                 vdst= p->data[2] + p->linesize[2]*cy;

  1319. 

  1320.                 s->dsp.sub_hfyu_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);

  1321.                 s->dsp.sub_hfyu_median_prediction(s->temp[1], udst - fake_ustride, udst, width2, &leftu, &lefttopu);

  1322.                 s->dsp.sub_hfyu_median_prediction(s->temp[2], vdst - fake_vstride, vdst, width2, &leftv, &lefttopv);

  1323. 

  1324.                 encode_422_bitstream(s, width);

  1325.             }

  1326.         }else{

  1327.             for(cy=y=1; y<height; y++,cy++){

  1328.                 uint8_t *ydst, *udst, *vdst;

  1329. 

  1330.                 /* encode a luma only line & y++ */

  1331.                 if(s->bitstream_bpp==12){

  1332.                     ydst= p->data[0] + p->linesize[0]*y;

  1333. 

  1334.                     if(s->predictor == PLANE && s->interlaced < y){

  1335.                         s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);

  1336. 

  1337.                         lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);

  1338.                     }else{

  1339.                         lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);

  1340.                     }

  1341.                     encode_gray_bitstream(s, width);

  1342.                     y++;

  1343.                     if(y>=height) break;

  1344.                 }

  1345. 

  1346.                 ydst= p->data[0] + p->linesize[0]*y;

  1347.                 udst= p->data[1] + p->linesize[1]*cy;

  1348.                 vdst= p->data[2] + p->linesize[2]*cy;

  1349. 

  1350.                 if(s->predictor == PLANE && s->interlaced < cy){

  1351.                     s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);

  1352.                     s->dsp.diff_bytes(s->temp[2], udst, udst - fake_ustride, width2);

  1353.                     s->dsp.diff_bytes(s->temp[2] + width2, vdst, vdst - fake_vstride, width2);

  1354. 

  1355.                     lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);

  1356.                     leftu= sub_left_prediction(s, s->temp[1], s->temp[2], width2, leftu);

  1357.                     leftv= sub_left_prediction(s, s->temp[2], s->temp[2] + width2, width2, leftv);

  1358.                 }else{

  1359.                     lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);

  1360.                     leftu= sub_left_prediction(s, s->temp[1], udst, width2, leftu);

  1361.                     leftv= sub_left_prediction(s, s->temp[2], vdst, width2, leftv);

  1362.                 }

  1363. 

  1364.                 encode_422_bitstream(s, width);

  1365.             }

  1366.         }

  1367.     }else if(avctx->pix_fmt == PIX_FMT_RGB32){

  1368.         uint8_t *data = p->data[0] + (height-1)*p->linesize[0];

  1369.         const int stride = -p->linesize[0];

  1370.         const int fake_stride = -fake_ystride;

  1371.         int y;

  1372.         int leftr, leftg, leftb;

  1373. 

  1374.         put_bits(&s->pb, 8, leftr= data[R]);

  1375.         put_bits(&s->pb, 8, leftg= data[G]);

  1376.         put_bits(&s->pb, 8, leftb= data[B]);

  1377.         put_bits(&s->pb, 8, 0);

  1378. 

  1379.         sub_left_prediction_bgr32(s, s->temp[0], data+4, width-1, &leftr, &leftg, &leftb);

  1380.         encode_bgr_bitstream(s, width-1);

  1381. 

  1382.         for(y=1; y<s->height; y++){

  1383.             uint8_t *dst = data + y*stride;

  1384.             if(s->predictor == PLANE && s->interlaced < y){

  1385.                 s->dsp.diff_bytes(s->temp[1], dst, dst - fake_stride, width*4);

  1386.                 sub_left_prediction_bgr32(s, s->temp[0], s->temp[1], width, &leftr, &leftg, &leftb);

  1387.             }else{

  1388.                 sub_left_prediction_bgr32(s, s->temp[0], dst, width, &leftr, &leftg, &leftb);

  1389.             }

  1390.             encode_bgr_bitstream(s, width);

  1391.         }

  1392.     }else{

  1393.         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");

  1394.     }

  1395.     emms_c();

  1396. 

  1397.     size+= (put_bits_count(&s->pb)+31)/8;

  1398.     size/= 4;

  1399. 

  1400.     if((s->flags&CODEC_FLAG_PASS1) && (s->picture_number&31)==0){

  1401.         int j;

  1402.         char *p= avctx->stats_out;

  1403.         char *end= p + 1024*30;

  1404.         for(i=0; i<3; i++){

  1405.             for(j=0; j<256; j++){

  1406.                 snprintf(p, end-p, "%"PRIu64" ", s->stats[i][j]);

  1407.                 p+= strlen(p);

  1408.                 s->stats[i][j]= 0;

  1409.             }

  1410.             snprintf(p, end-p, "\n");

  1411.             p++;

  1412.         }

  1413.     } else

  1414.         avctx->stats_out[0] = '\0';

  1415.     if(!(s->avctx->flags2 & CODEC_FLAG2_NO_OUTPUT)){

  1416.         flush_put_bits(&s->pb);

  1417.         s->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, size);

  1418.     }

  1419. 

  1420.     s->picture_number++;

  1421. 

  1422.     return size*4;

  1423. }

  1424. 

  1425. static av_cold int encode_end(AVCodecContext *avctx)

  1426. {

  1427.     HYuvContext *s = avctx->priv_data;

  1428. 

  1429.     common_end(s);

  1430. 

  1431.     av_freep(&avctx->extradata);

  1432.     av_freep(&avctx->stats_out);

  1433. 

  1434.     return 0;

  1435. }

  1436. #endif /* CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER */

  1437. 

  1438. #if CONFIG_HUFFYUV_DECODER

  1439. AVCodec huffyuv_decoder = {

  1440.     "huffyuv",

  1441.     CODEC_TYPE_VIDEO,

  1442.     CODEC_ID_HUFFYUV,

  1443.     sizeof(HYuvContext),

  1444.     decode_init,

  1445.     NULL,

  1446.     decode_end,

  1447.     decode_frame,

  1448.     CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,

  1449.     NULL,

  1450.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1451. };

  1452. #endif

  1453. 

  1454. #if CONFIG_FFVHUFF_DECODER

  1455. AVCodec ffvhuff_decoder = {

  1456.     "ffvhuff",

  1457.     CODEC_TYPE_VIDEO,

  1458.     CODEC_ID_FFVHUFF,

  1459.     sizeof(HYuvContext),

  1460.     decode_init,

  1461.     NULL,

  1462.     decode_end,

  1463.     decode_frame,

  1464.     CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,

  1465.     NULL,

  1466.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1467. };

  1468. #endif

  1469. 

  1470. #if CONFIG_HUFFYUV_ENCODER

  1471. AVCodec huffyuv_encoder = {

  1472.     "huffyuv",

  1473.     CODEC_TYPE_VIDEO,

  1474.     CODEC_ID_HUFFYUV,

  1475.     sizeof(HYuvContext),

  1476.     encode_init,

  1477.     encode_frame,

  1478.     encode_end,

  1479.     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},

  1480.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1481. };

  1482. #endif

  1483. 

  1484. #if CONFIG_FFVHUFF_ENCODER

  1485. AVCodec ffvhuff_encoder = {

  1486.     "ffvhuff",

  1487.     CODEC_TYPE_VIDEO,

  1488.     CODEC_ID_FFVHUFF,

  1489.     sizeof(HYuvContext),

  1490.     encode_init,

  1491.     encode_frame,

  1492.     encode_end,

  1493.     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},

  1494.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1495. };

  1496. #endif