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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. #include "thread.h"

  36. 

  37. #define VLC_BITS 11

  38. 

  39. #if HAVE_BIGENDIAN

  40. #define B 3

  41. #define G 2

  42. #define R 1

  43. #define A 0

  44. #else

  45. #define B 0

  46. #define G 1

  47. #define R 2

  48. #define A 3

  49. #endif

  50. 

  51. typedef enum Predictor{

  52.     LEFT= 0,

  53.     PLANE,

  54.     MEDIAN,

  55. } Predictor;

  56. 

  57. typedef struct HYuvContext{

  58.     AVCodecContext *avctx;

  59.     Predictor predictor;

  60.     GetBitContext gb;

  61.     PutBitContext pb;

  62.     int interlaced;

  63.     int decorrelate;

  64.     int bitstream_bpp;

  65.     int version;

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

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

  68.     int width, height;

  69.     int flags;

  70.     int context;

  71.     int picture_number;

  72.     int last_slice_end;

  73.     uint8_t *temp[3];

  74.     uint64_t stats[3][256];

  75.     uint8_t len[3][256];

  76.     uint32_t bits[3][256];

  77.     uint32_t pix_bgr_map[1<<VLC_BITS];

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

  79.     AVFrame picture;

  80.     uint8_t *bitstream_buffer;

  81.     unsigned int bitstream_buffer_size;

  82.     DSPContext dsp;

  83. }HYuvContext;

  84. 

  85. static const unsigned char classic_shift_luma[] = {

  86.   34,36,35,69,135,232,9,16,10,24,11,23,12,16,13,10,14,8,15,8,

  87.   16,8,17,20,16,10,207,206,205,236,11,8,10,21,9,23,8,8,199,70,

  88.   69,68, 0

  89. };

  90. 

  91. static const unsigned char classic_shift_chroma[] = {

  92.   66,36,37,38,39,40,41,75,76,77,110,239,144,81,82,83,84,85,118,183,

  93.   56,57,88,89,56,89,154,57,58,57,26,141,57,56,58,57,58,57,184,119,

  94.   214,245,116,83,82,49,80,79,78,77,44,75,41,40,39,38,37,36,34, 0

  95. };

  96. 

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

  98.     3,  9,  5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,

  99.    73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,

  100.    68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,

  101.    35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,

  102.    37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,

  103.    35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,

  104.    27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,

  105.    15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,

  106.    12, 17, 19, 13,  4,  9,  2, 11,  1,  7,  8,  0, 16,  3, 14,  6,

  107.    12, 10,  5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,

  108.    18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,

  109.    28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,

  110.    28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,

  111.    62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,

  112.    54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,

  113.    46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13,  7,  8,

  114. };

  115. 

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

  117.     3,  1,  2,  2,  2,  2,  3,  3,  7,  5,  7,  5,  8,  6, 11,  9,

  118.     7, 13, 11, 10,  9,  8,  7,  5,  9,  7,  6,  4,  7,  5,  8,  7,

  119.    11,  8, 13, 11, 19, 15, 22, 23, 20, 33, 32, 28, 27, 29, 51, 77,

  120.    43, 45, 76, 81, 46, 82, 75, 55, 56,144, 58, 80, 60, 74,147, 63,

  121.   143, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,

  122.    80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 27, 30, 21, 22,

  123.    17, 14,  5,  6,100, 54, 47, 50, 51, 53,106,107,108,109,110,111,

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

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

  126.   135,132,133,104, 64,101, 62, 57,102, 95, 93, 59, 61, 28, 97, 96,

  127.    52, 49, 48, 29, 32, 25, 24, 46, 23, 98, 45, 44, 43, 20, 42, 41,

  128.    19, 18, 99, 40, 15, 39, 38, 16, 13, 12, 11, 37, 10,  9,  8, 36,

  129.     7,128,127,105,123,116, 35, 34, 33,145, 31, 79, 42,146, 78, 26,

  130.    83, 48, 49, 50, 44, 47, 26, 31, 30, 18, 17, 19, 21, 24, 25, 13,

  131.    14, 16, 17, 18, 20, 21, 12, 14, 15,  9, 10,  6,  9,  6,  5,  8,

  132.     6, 12,  8, 10,  7,  9,  6,  4,  6,  2,  2,  3,  3,  3,  3,  2,

  133. };

  134. 

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

  136.     int i;

  137.     if(w<32){

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

  139.             const int temp= src[i];

  140.             dst[i]= temp - left;

  141.             left= temp;

  142.         }

  143.         return left;

  144.     }else{

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

  146.             const int temp= src[i];

  147.             dst[i]= temp - left;

  148.             left= temp;

  149.         }

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

  151.         return src[w-1];

  152.     }

  153. }

  154. 

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

  156.     int i;

  157.     int r,g,b;

  158.     r= *red;

  159.     g= *green;

  160.     b= *blue;

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

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

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

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

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

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

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

  168.         r = rt;

  169.         g = gt;

  170.         b = bt;

  171.     }

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

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

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

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

  176. }

  177. 

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

  179.     int i, val, repeat;

  180. 

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

  182.         repeat= get_bits(gb, 3);

  183.         val   = get_bits(gb, 5);

  184.         if(repeat==0)

  185.             repeat= get_bits(gb, 8);

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

  187.         if(i+repeat > 256) {

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

  189.             return -1;

  190.         }

  191.         while (repeat--)

  192.             dst[i++] = val;

  193.     }

  194.     return 0;

  195. }

  196. 

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

  198.     int len, index;

  199.     uint32_t bits=0;

  200. 

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

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

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

  204.                 dst[index]= bits++;

  205.         }

  206.         if(bits & 1){

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

  208.             return -1;

  209.         }

  210.         bits >>= 1;

  211.     }

  212.     return 0;

  213. }

  214. 

  215. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  216. typedef struct {

  217.     uint64_t val;

  218.     int name;

  219. } HeapElem;

  220. 

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

  222. {

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

  224.         int child = root*2+1;

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

  226.             child++;

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

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

  229.             root = child;

  230.         } else

  231.             break;

  232.     }

  233. }

  234. 

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

  236.     HeapElem h[256];

  237.     int up[2*256];

  238.     int len[2*256];

  239.     int offset, i, next;

  240.     int size = 256;

  241. 

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

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

  244.             h[i].name = i;

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

  246.         }

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

  248.             heap_sift(h, i, size);

  249. 

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

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

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

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

  254.             h[0].val = INT64_MAX;

  255.             heap_sift(h, 0, size);

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

  257.             h[0].name = next;

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

  259.             heap_sift(h, 0, size);

  260.         }

  261. 

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

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

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

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

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

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

  268.         }

  269.         if(i==size) break;

  270.     }

  271. }

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

  273. 

  274. static void generate_joint_tables(HYuvContext *s){

  275.     uint16_t symbols[1<<VLC_BITS];

  276.     uint16_t bits[1<<VLC_BITS];

  277.     uint8_t len[1<<VLC_BITS];

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

  279.         int p, i, y, u;

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

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

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

  283.                 int limit = VLC_BITS - len0;

  284.                 if(limit <= 0)

  285.                     continue;

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

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

  288.                     if(len1 > limit)

  289.                         continue;

  290.                     len[i] = len0 + len1;

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

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

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

  294.                         i++;

  295.                 }

  296.             }

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

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

  299.         }

  300.     }else{

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

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

  303.         int p0 = s->decorrelate;

  304.         int p1 = !s->decorrelate;

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

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

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

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

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

  310.             int limit0 = VLC_BITS - len0;

  311.             if(limit0 < 2)

  312.                 continue;

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

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

  315.                 int limit1 = limit0 - len1;

  316.                 if(limit1 < 1)

  317.                     continue;

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

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

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

  321.                     if(len2 > limit1)

  322.                         continue;

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

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

  325.                     if(s->decorrelate){

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

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

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

  329.                     }else{

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

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

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

  333.                     }

  334.                     i++;

  335.                 }

  336.             }

  337.         }

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

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

  340.     }

  341. }

  342. 

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

  344.     GetBitContext gb;

  345.     int i;

  346. 

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

  348. 

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

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

  351.             return -1;

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

  353.             return -1;

  354.         }

  355. #if 0

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

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

  358. }

  359. #endif

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

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

  362.     }

  363. 

  364.     generate_joint_tables(s);

  365. 

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

  367. }

  368. 

  369. static int read_old_huffman_tables(HYuvContext *s){

  370. #if 1

  371.     GetBitContext gb;

  372.     int i;

  373. 

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

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

  376.         return -1;

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

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

  379.         return -1;

  380. 

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

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

  383. 

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

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

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

  387.     }

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

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

  390. 

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

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

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

  394.     }

  395. 

  396.     generate_joint_tables(s);

  397. 

  398.     return 0;

  399. #else

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

  401.     return -1;

  402. #endif

  403. }

  404. 

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

  406.     int i;

  407. 

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

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

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

  411.         }

  412.     }else{

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

  414.     }

  415. }

  416. 

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

  418.     HYuvContext *s = avctx->priv_data;

  419. 

  420.     s->avctx= avctx;

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

  422. 

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

  424. 

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

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

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

  428. 

  429.     return 0;

  430. }

  431. 

  432. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

  433. static av_cold int decode_init(AVCodecContext *avctx)

  434. {

  435.     HYuvContext *s = avctx->priv_data;

  436. 

  437.     common_init(avctx);

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

  439. 

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

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

  442. 

  443. s->bgr32=1;

  444. //if(avctx->extradata)

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

  446.     if(avctx->extradata_size){

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

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

  449.         else

  450.             s->version=2;

  451.     }else

  452.         s->version=0;

  453. 

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

  455.         int method, interlace;

  456. 

  457.         if (avctx->extradata_size < 4)

  458.             return -1;

  459. 

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

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

  462.         s->predictor= method&63;

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

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

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

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

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

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

  469. 

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

  471.             return -1;

  472.     }else{

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

  474.         case 1:

  475.             s->predictor= LEFT;

  476.             s->decorrelate= 0;

  477.             break;

  478.         case 2:

  479.             s->predictor= LEFT;

  480.             s->decorrelate= 1;

  481.             break;

  482.         case 3:

  483.             s->predictor= PLANE;

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

  485.             break;

  486.         case 4:

  487.             s->predictor= MEDIAN;

  488.             s->decorrelate= 0;

  489.             break;

  490.         default:

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

  492.             s->decorrelate= 0;

  493.             break;

  494.         }

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

  496.         s->context= 0;

  497. 

  498.         if(read_old_huffman_tables(s) < 0)

  499.             return -1;

  500.     }

  501. 

  502.     switch(s->bitstream_bpp){

  503.     case 12:

  504.         avctx->pix_fmt = PIX_FMT_YUV420P;

  505.         break;

  506.     case 16:

  507.         if(s->yuy2){

  508.             avctx->pix_fmt = PIX_FMT_YUYV422;

  509.         }else{

  510.             avctx->pix_fmt = PIX_FMT_YUV422P;

  511.         }

  512.         break;

  513.     case 24:

  514.     case 32:

  515.         if(s->bgr32){

  516.             avctx->pix_fmt = PIX_FMT_RGB32;

  517.         }else{

  518.             avctx->pix_fmt = PIX_FMT_BGR24;

  519.         }

  520.         break;

  521.     default:

  522.         assert(0);

  523.     }

  524. 

  525.     alloc_temp(s);

  526. 

  527. //    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);

  528. 

  529.     return 0;

  530. }

  531. 

  532. static av_cold int decode_init_thread_copy(AVCodecContext *avctx)

  533. {

  534.     HYuvContext *s = avctx->priv_data;

  535.     int i;

  536. 

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

  538.     alloc_temp(s);

  539. 

  540.     for (i = 0; i < 6; i++)

  541.         s->vlc[i].table = NULL;

  542. 

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

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

  545.             return -1;

  546.     }else{

  547.         if(read_old_huffman_tables(s) < 0)

  548.             return -1;

  549.     }

  550. 

  551.     return 0;

  552. }

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

  554. 

  555. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

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

  557.     int i;

  558.     int index= 0;

  559. 

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

  561.         int val= len[i];

  562.         int repeat=0;

  563. 

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

  565.             repeat++;

  566. 

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

  568.         if(repeat>7){

  569.             buf[index++]= val;

  570.             buf[index++]= repeat;

  571.         }else{

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

  573.         }

  574.     }

  575. 

  576.     return index;

  577. }

  578. 

  579. static av_cold int encode_init(AVCodecContext *avctx)

  580. {

  581.     HYuvContext *s = avctx->priv_data;

  582.     int i, j;

  583. 

  584.     common_init(avctx);

  585. 

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

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

  588.     s->version=2;

  589. 

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

  591. 

  592.     switch(avctx->pix_fmt){

  593.     case PIX_FMT_YUV420P:

  594.         s->bitstream_bpp= 12;

  595.         break;

  596.     case PIX_FMT_YUV422P:

  597.         s->bitstream_bpp= 16;

  598.         break;

  599.     case PIX_FMT_RGB32:

  600.         s->bitstream_bpp= 24;

  601.         break;

  602.     default:

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

  604.         return -1;

  605.     }

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

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

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

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

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

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

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

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

  614.             return -1;

  615.         }

  616.     }else s->context= 0;

  617. 

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

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

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

  621.             return -1;

  622.         }

  623.         if(avctx->context_model){

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

  625.             return -1;

  626.         }

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

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

  629.     }

  630. 

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

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

  633.         return -1;

  634.     }

  635. 

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

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

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

  639.     if(s->context)

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

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

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

  643. 

  644.     if(avctx->stats_in){

  645.         char *p= avctx->stats_in;

  646. 

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

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

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

  650. 

  651.         for(;;){

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

  653.                 char *next;

  654. 

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

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

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

  658.                     p=next;

  659.                 }

  660.             }

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

  662.         }

  663.     }else{

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

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

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

  667. 

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

  669.             }

  670.     }

  671. 

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

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

  674. 

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

  676.             return -1;

  677.         }

  678. 

  679.         s->avctx->extradata_size+=

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

  681.     }

  682. 

  683.     if(s->context){

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

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

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

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

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

  689.             }

  690.         }

  691.     }else{

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

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

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

  695.     }

  696. 

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

  698. 

  699.     alloc_temp(s);

  700. 

  701.     s->picture_number=0;

  702. 

  703.     return 0;

  704. }

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

  706. 

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

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

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

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

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

  712.         dst0 = code>>8;\

  713.         dst1 = code;\

  714.     }else{\

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

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

  717.     }\

  718. }

  719. 

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

  721.     int i;

  722. 

  723.     count/=2;

  724. 

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

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

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

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

  729.         }

  730.     }else{

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

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

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

  734.         }

  735.     }

  736. }

  737. 

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

  739.     int i;

  740. 

  741.     count/=2;

  742. 

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

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

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

  746.         }

  747.     }else{

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

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

  750.         }

  751.     }

  752. }

  753. 

  754. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

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

  756.     int i;

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

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

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

  760. 

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

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

  763.         return -1;

  764.     }

  765. 

  766. #define LOAD4\

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

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

  769.             int u0 = u[i];\

  770.             int v0 = v[i];

  771. 

  772.     count/=2;

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

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

  775.             LOAD4;

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

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

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

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

  780.         }

  781.     }

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

  783.         return 0;

  784.     if(s->context){

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

  786.             LOAD4;

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

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

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

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

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

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

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

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

  795.         }

  796.     }else{

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

  798.             LOAD4;

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

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

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

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

  803.         }

  804.     }

  805.     return 0;

  806. }

  807. 

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

  809.     int i;

  810. 

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

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

  813.         return -1;

  814.     }

  815. 

  816. #define LOAD2\

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

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

  819. #define STAT2\

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

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

  822. #define WRITE2\

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

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

  825. 

  826.     count/=2;

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

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

  829.             LOAD2;

  830.             STAT2;

  831.         }

  832.     }

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

  834.         return 0;

  835. 

  836.     if(s->context){

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

  838.             LOAD2;

  839.             STAT2;

  840.             WRITE2;

  841.         }

  842.     }else{

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

  844.             LOAD2;

  845.             WRITE2;

  846.         }

  847.     }

  848.     return 0;

  849. }

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

  851. 

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

  853.     int i;

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

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

  856.         if(code != -1){

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

  858.         }else if(decorrelate){

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

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

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

  862.         }else{

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

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

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

  866.         }

  867.         if(alpha)

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

  869.     }

  870. }

  871. 

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

  873.     if(s->decorrelate){

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

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

  876.         else

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

  878.     }else{

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

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

  881.         else

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

  883.     }

  884. }

  885. 

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

  887.     int i;

  888. 

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

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

  891.         return -1;

  892.     }

  893. 

  894. #define LOAD3\

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

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

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

  898. #define STAT3\

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

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

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

  902. #define WRITE3\

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

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

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

  906. 

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

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

  909.             LOAD3;

  910.             STAT3;

  911.         }

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

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

  914.             LOAD3;

  915.             STAT3;

  916.             WRITE3;

  917.         }

  918.     }else{

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

  920.             LOAD3;

  921.             WRITE3;

  922.         }

  923.     }

  924.     return 0;

  925. }

  926. 

  927. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

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

  929.     int h, cy;

  930.     int offset[4];

  931. 

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

  933.         return;

  934. 

  935.     h= y - s->last_slice_end;

  936.     y -= h;

  937. 

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

  939.         cy= y>>1;

  940.     }else{

  941.         cy= y;

  942.     }

  943. 

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

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

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

  947.     offset[3] = 0;

  948.     emms_c();

  949. 

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

  951. 

  952.     s->last_slice_end= y + h;

  953. }

  954. 

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

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

  957.     int buf_size = avpkt->size;

  958.     HYuvContext *s = avctx->priv_data;

  959.     const int width= s->width;

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

  961.     const int height= s->height;

  962.     int fake_ystride, fake_ustride, fake_vstride;

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

  964.     int table_size= 0;

  965. 

  966.     AVFrame *picture = data;

  967. 

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

  969.     if (!s->bitstream_buffer)

  970.         return AVERROR(ENOMEM);

  971. 

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

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

  974. 

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

  976.         ff_thread_release_buffer(avctx, p);

  977. 

  978.     p->reference= 0;

  979.     if(ff_thread_get_buffer(avctx, p) < 0){

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

  981.         return -1;

  982.     }

  983. 

  984.     if(s->context){

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

  986.         if(table_size < 0)

  987.             return -1;

  988.     }

  989. 

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

  991.         return -1;

  992. 

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

  994. 

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

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

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

  998. 

  999.     s->last_slice_end= 0;

  1000. 

  1001.     if(s->bitstream_bpp<24){

  1002.         int y, cy;

  1003.         int lefty, leftu, leftv;

  1004.         int lefttopy, lefttopu, lefttopv;

  1005. 

  1006.         if(s->yuy2){

  1007.             p->data[0][3]= get_bits(&s->gb, 8);

  1008.             p->data[0][2]= get_bits(&s->gb, 8);

  1009.             p->data[0][1]= get_bits(&s->gb, 8);

  1010.             p->data[0][0]= get_bits(&s->gb, 8);

  1011. 

  1012.             av_log(avctx, AV_LOG_ERROR, "YUY2 output is not implemented yet\n");

  1013.             return -1;

  1014.         }else{

  1015. 

  1016.             leftv= p->data[2][0]= get_bits(&s->gb, 8);

  1017.             lefty= p->data[0][1]= get_bits(&s->gb, 8);

  1018.             leftu= p->data[1][0]= get_bits(&s->gb, 8);

  1019.                    p->data[0][0]= get_bits(&s->gb, 8);

  1020. 

  1021.             switch(s->predictor){

  1022.             case LEFT:

  1023.             case PLANE:

  1024.                 decode_422_bitstream(s, width-2);

  1025.                 lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);

  1026.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1027.                     leftu= s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2-1, leftu);

  1028.                     leftv= s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2-1, leftv);

  1029.                 }

  1030. 

  1031.                 for(cy=y=1; y<s->height; y++,cy++){

  1032.                     uint8_t *ydst, *udst, *vdst;

  1033. 

  1034.                     if(s->bitstream_bpp==12){

  1035.                         decode_gray_bitstream(s, width);

  1036. 

  1037.                         ydst= p->data[0] + p->linesize[0]*y;

  1038. 

  1039.                         lefty= s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);

  1040.                         if(s->predictor == PLANE){

  1041.                             if(y>s->interlaced)

  1042.                                 s->dsp.add_bytes(ydst, ydst - fake_ystride, width);

  1043.                         }

  1044.                         y++;

  1045.                         if(y>=s->height) break;

  1046.                     }

  1047. 

  1048.                     draw_slice(s, y);

  1049. 

  1050.                     ydst= p->data[0] + p->linesize[0]*y;

  1051.                     udst= p->data[1] + p->linesize[1]*cy;

  1052.                     vdst= p->data[2] + p->linesize[2]*cy;

  1053. 

  1054.                     decode_422_bitstream(s, width);

  1055.                     lefty= s->dsp.add_hfyu_left_prediction(ydst, s->temp[0], width, lefty);

  1056.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1057.                         leftu= s->dsp.add_hfyu_left_prediction(udst, s->temp[1], width2, leftu);

  1058.                         leftv= s->dsp.add_hfyu_left_prediction(vdst, s->temp[2], width2, leftv);

  1059.                     }

  1060.                     if(s->predictor == PLANE){

  1061.                         if(cy>s->interlaced){

  1062.                             s->dsp.add_bytes(ydst, ydst - fake_ystride, width);

  1063.                             if(!(s->flags&CODEC_FLAG_GRAY)){

  1064.                                 s->dsp.add_bytes(udst, udst - fake_ustride, width2);

  1065.                                 s->dsp.add_bytes(vdst, vdst - fake_vstride, width2);

  1066.                             }

  1067.                         }

  1068.                     }

  1069.                 }

  1070.                 draw_slice(s, height);

  1071. 

  1072.                 break;

  1073.             case MEDIAN:

  1074.                 /* first line except first 2 pixels is left predicted */

  1075.                 decode_422_bitstream(s, width-2);

  1076.                 lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);

  1077.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1078.                     leftu= s->dsp.add_hfyu_left_prediction(p->data[1] + 1, s->temp[1], width2-1, leftu);

  1079.                     leftv= s->dsp.add_hfyu_left_prediction(p->data[2] + 1, s->temp[2], width2-1, leftv);

  1080.                 }

  1081. 

  1082.                 cy=y=1;

  1083. 

  1084.                 /* second line is left predicted for interlaced case */

  1085.                 if(s->interlaced){

  1086.                     decode_422_bitstream(s, width);

  1087.                     lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + p->linesize[0], s->temp[0], width, lefty);

  1088.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1089.                         leftu= s->dsp.add_hfyu_left_prediction(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);

  1090.                         leftv= s->dsp.add_hfyu_left_prediction(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);

  1091.                     }

  1092.                     y++; cy++;

  1093.                 }

  1094. 

  1095.                 /* next 4 pixels are left predicted too */

  1096.                 decode_422_bitstream(s, 4);

  1097.                 lefty= s->dsp.add_hfyu_left_prediction(p->data[0] + fake_ystride, s->temp[0], 4, lefty);

  1098.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1099.                     leftu= s->dsp.add_hfyu_left_prediction(p->data[1] + fake_ustride, s->temp[1], 2, leftu);

  1100.                     leftv= s->dsp.add_hfyu_left_prediction(p->data[2] + fake_vstride, s->temp[2], 2, leftv);

  1101.                 }

  1102. 

  1103.                 /* next line except the first 4 pixels is median predicted */

  1104.                 lefttopy= p->data[0][3];

  1105.                 decode_422_bitstream(s, width-4);

  1106.                 s->dsp.add_hfyu_median_prediction(p->data[0] + fake_ystride+4, p->data[0]+4, s->temp[0], width-4, &lefty, &lefttopy);

  1107.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1108.                     lefttopu= p->data[1][1];

  1109.                     lefttopv= p->data[2][1];

  1110.                     s->dsp.add_hfyu_median_prediction(p->data[1] + fake_ustride+2, p->data[1]+2, s->temp[1], width2-2, &leftu, &lefttopu);

  1111.                     s->dsp.add_hfyu_median_prediction(p->data[2] + fake_vstride+2, p->data[2]+2, s->temp[2], width2-2, &leftv, &lefttopv);

  1112.                 }

  1113.                 y++; cy++;

  1114. 

  1115.                 for(; y<height; y++,cy++){

  1116.                     uint8_t *ydst, *udst, *vdst;

  1117. 

  1118.                     if(s->bitstream_bpp==12){

  1119.                         while(2*cy > y){

  1120.                             decode_gray_bitstream(s, width);

  1121.                             ydst= p->data[0] + p->linesize[0]*y;

  1122.                             s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);

  1123.                             y++;

  1124.                         }

  1125.                         if(y>=height) break;

  1126.                     }

  1127.                     draw_slice(s, y);

  1128. 

  1129.                     decode_422_bitstream(s, width);

  1130. 

  1131.                     ydst= p->data[0] + p->linesize[0]*y;

  1132.                     udst= p->data[1] + p->linesize[1]*cy;

  1133.                     vdst= p->data[2] + p->linesize[2]*cy;

  1134. 

  1135.                     s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);

  1136.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1137.                         s->dsp.add_hfyu_median_prediction(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);

  1138.                         s->dsp.add_hfyu_median_prediction(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);

  1139.                     }

  1140.                 }

  1141. 

  1142.                 draw_slice(s, height);

  1143.                 break;

  1144.             }

  1145.         }

  1146.     }else{

  1147.         int y;

  1148.         int leftr, leftg, leftb, lefta;

  1149.         const int last_line= (height-1)*p->linesize[0];

  1150. 

  1151.         if(s->bitstream_bpp==32){

  1152.             lefta= p->data[0][last_line+A]= get_bits(&s->gb, 8);

  1153.             leftr= p->data[0][last_line+R]= get_bits(&s->gb, 8);

  1154.             leftg= p->data[0][last_line+G]= get_bits(&s->gb, 8);

  1155.             leftb= p->data[0][last_line+B]= get_bits(&s->gb, 8);

  1156.         }else{

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

  1161.             skip_bits(&s->gb, 8);

  1162.         }

  1163. 

  1164.         if(s->bgr32){

  1165.             switch(s->predictor){

  1166.             case LEFT:

  1167.             case PLANE:

  1168.                 decode_bgr_bitstream(s, width-1);

  1169.                 s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + last_line+4, s->temp[0], width-1, &leftr, &leftg, &leftb, &lefta);

  1170. 

  1171.                 for(y=s->height-2; y>=0; y--){ //Yes it is stored upside down.

  1172.                     decode_bgr_bitstream(s, width);

  1173. 

  1174.                     s->dsp.add_hfyu_left_prediction_bgr32(p->data[0] + p->linesize[0]*y, s->temp[0], width, &leftr, &leftg, &leftb, &lefta);

  1175.                     if(s->predictor == PLANE){

  1176.                         if(s->bitstream_bpp!=32) lefta=0;

  1177.                         if((y&s->interlaced)==0 && y<s->height-1-s->interlaced){

  1178.                             s->dsp.add_bytes(p->data[0] + p->linesize[0]*y,

  1179.                                              p->data[0] + p->linesize[0]*y + fake_ystride, fake_ystride);

  1180.                         }

  1181.                     }

  1182.                 }

  1183.                 draw_slice(s, height); // just 1 large slice as this is not possible in reverse order

  1184.                 break;

  1185.             default:

  1186.                 av_log(avctx, AV_LOG_ERROR, "prediction type not supported!\n");

  1187.             }

  1188.         }else{

  1189. 

  1190.             av_log(avctx, AV_LOG_ERROR, "BGR24 output is not implemented yet\n");

  1191.             return -1;

  1192.         }

  1193.     }

  1194.     emms_c();

  1195. 

  1196.     *picture= *p;

  1197.     *data_size = sizeof(AVFrame);

  1198. 

  1199.     return (get_bits_count(&s->gb)+31)/32*4 + table_size;

  1200. }

  1201. #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */

  1202. 

  1203. static int common_end(HYuvContext *s){

  1204.     int i;

  1205. 

  1206.     for(i=0; i<3; i++){

  1207.         av_freep(&s->temp[i]);

  1208.     }

  1209.     return 0;

  1210. }

  1211. 

  1212. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

  1213. static av_cold int decode_end(AVCodecContext *avctx)

  1214. {

  1215.     HYuvContext *s = avctx->priv_data;

  1216.     int i;

  1217. 

  1218.     if (s->picture.data[0])

  1219.         avctx->release_buffer(avctx, &s->picture);

  1220. 

  1221.     common_end(s);

  1222.     av_freep(&s->bitstream_buffer);

  1223. 

  1224.     for(i=0; i<6; i++){

  1225.         free_vlc(&s->vlc[i]);

  1226.     }

  1227. 

  1228.     return 0;

  1229. }

  1230. #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */

  1231. 

  1232. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  1233. static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

  1234.     HYuvContext *s = avctx->priv_data;

  1235.     AVFrame *pict = data;

  1236.     const int width= s->width;

  1237.     const int width2= s->width>>1;

  1238.     const int height= s->height;

  1239.     const int fake_ystride= s->interlaced ? pict->linesize[0]*2  : pict->linesize[0];

  1240.     const int fake_ustride= s->interlaced ? pict->linesize[1]*2  : pict->linesize[1];

  1241.     const int fake_vstride= s->interlaced ? pict->linesize[2]*2  : pict->linesize[2];

  1242.     AVFrame * const p= &s->picture;

  1243.     int i, j, size=0;

  1244. 

  1245.     *p = *pict;

  1246.     p->pict_type= FF_I_TYPE;

  1247.     p->key_frame= 1;

  1248. 

  1249.     if(s->context){

  1250.         for(i=0; i<3; i++){

  1251.             generate_len_table(s->len[i], s->stats[i]);

  1252.             if(generate_bits_table(s->bits[i], s->len[i])<0)

  1253.                 return -1;

  1254.             size+= store_table(s, s->len[i], &buf[size]);

  1255.         }

  1256. 

  1257.         for(i=0; i<3; i++)

  1258.             for(j=0; j<256; j++)

  1259.                 s->stats[i][j] >>= 1;

  1260.     }

  1261. 

  1262.     init_put_bits(&s->pb, buf+size, buf_size-size);

  1263. 

  1264.     if(avctx->pix_fmt == PIX_FMT_YUV422P || avctx->pix_fmt == PIX_FMT_YUV420P){

  1265.         int lefty, leftu, leftv, y, cy;

  1266. 

  1267.         put_bits(&s->pb, 8, leftv= p->data[2][0]);

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

  1269.         put_bits(&s->pb, 8, leftu= p->data[1][0]);

  1270.         put_bits(&s->pb, 8,        p->data[0][0]);

  1271. 

  1272.         lefty= sub_left_prediction(s, s->temp[0], p->data[0], width , 0);

  1273.         leftu= sub_left_prediction(s, s->temp[1], p->data[1], width2, 0);

  1274.         leftv= sub_left_prediction(s, s->temp[2], p->data[2], width2, 0);

  1275. 

  1276.         encode_422_bitstream(s, 2, width-2);

  1277. 

  1278.         if(s->predictor==MEDIAN){

  1279.             int lefttopy, lefttopu, lefttopv;

  1280.             cy=y=1;

  1281.             if(s->interlaced){

  1282.                 lefty= sub_left_prediction(s, s->temp[0], p->data[0]+p->linesize[0], width , lefty);

  1283.                 leftu= sub_left_prediction(s, s->temp[1], p->data[1]+p->linesize[1], width2, leftu);

  1284.                 leftv= sub_left_prediction(s, s->temp[2], p->data[2]+p->linesize[2], width2, leftv);

  1285. 

  1286.                 encode_422_bitstream(s, 0, width);

  1287.                 y++; cy++;

  1288.             }

  1289. 

  1290.             lefty= sub_left_prediction(s, s->temp[0], p->data[0]+fake_ystride, 4, lefty);

  1291.             leftu= sub_left_prediction(s, s->temp[1], p->data[1]+fake_ustride, 2, leftu);

  1292.             leftv= sub_left_prediction(s, s->temp[2], p->data[2]+fake_vstride, 2, leftv);

  1293. 

  1294.             encode_422_bitstream(s, 0, 4);

  1295. 

  1296.             lefttopy= p->data[0][3];

  1297.             lefttopu= p->data[1][1];

  1298.             lefttopv= p->data[2][1];

  1299.             s->dsp.sub_hfyu_median_prediction(s->temp[0], p->data[0]+4, p->data[0] + fake_ystride+4, width-4 , &lefty, &lefttopy);

  1300.             s->dsp.sub_hfyu_median_prediction(s->temp[1], p->data[1]+2, p->data[1] + fake_ustride+2, width2-2, &leftu, &lefttopu);

  1301.             s->dsp.sub_hfyu_median_prediction(s->temp[2], p->data[2]+2, p->data[2] + fake_vstride+2, width2-2, &leftv, &lefttopv);

  1302.             encode_422_bitstream(s, 0, width-4);

  1303.             y++; cy++;

  1304. 

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

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

  1307. 

  1308.                 if(s->bitstream_bpp==12){

  1309.                     while(2*cy > y){

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

  1311.                         s->dsp.sub_hfyu_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);

  1312.                         encode_gray_bitstream(s, width);

  1313.                         y++;

  1314.                     }

  1315.                     if(y>=height) break;

  1316.                 }

  1317.                 ydst= p->data[0] + p->linesize[0]*y;

  1318.                 udst= p->data[1] + p->linesize[1]*cy;

  1319.                 vdst= p->data[2] + p->linesize[2]*cy;

  1320. 

  1321.                 s->dsp.sub_hfyu_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);

  1322.                 s->dsp.sub_hfyu_median_prediction(s->temp[1], udst - fake_ustride, udst, width2, &leftu, &lefttopu);

  1323.                 s->dsp.sub_hfyu_median_prediction(s->temp[2], vdst - fake_vstride, vdst, width2, &leftv, &lefttopv);

  1324. 

  1325.                 encode_422_bitstream(s, 0, width);

  1326.             }

  1327.         }else{

  1328.             for(cy=y=1; y<height; y++,cy++){

  1329.                 uint8_t *ydst, *udst, *vdst;

  1330. 

  1331.                 /* encode a luma only line & y++ */

  1332.                 if(s->bitstream_bpp==12){

  1333.                     ydst= p->data[0] + p->linesize[0]*y;

  1334. 

  1335.                     if(s->predictor == PLANE && s->interlaced < y){

  1336.                         s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);

  1337. 

  1338.                         lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);

  1339.                     }else{

  1340.                         lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);

  1341.                     }

  1342.                     encode_gray_bitstream(s, width);

  1343.                     y++;

  1344.                     if(y>=height) break;

  1345.                 }

  1346. 

  1347.                 ydst= p->data[0] + p->linesize[0]*y;

  1348.                 udst= p->data[1] + p->linesize[1]*cy;

  1349.                 vdst= p->data[2] + p->linesize[2]*cy;

  1350. 

  1351.                 if(s->predictor == PLANE && s->interlaced < cy){

  1352.                     s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);

  1353.                     s->dsp.diff_bytes(s->temp[2], udst, udst - fake_ustride, width2);

  1354.                     s->dsp.diff_bytes(s->temp[2] + width2, vdst, vdst - fake_vstride, width2);

  1355. 

  1356.                     lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);

  1357.                     leftu= sub_left_prediction(s, s->temp[1], s->temp[2], width2, leftu);

  1358.                     leftv= sub_left_prediction(s, s->temp[2], s->temp[2] + width2, width2, leftv);

  1359.                 }else{

  1360.                     lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);

  1361.                     leftu= sub_left_prediction(s, s->temp[1], udst, width2, leftu);

  1362.                     leftv= sub_left_prediction(s, s->temp[2], vdst, width2, leftv);

  1363.                 }

  1364. 

  1365.                 encode_422_bitstream(s, 0, width);

  1366.             }

  1367.         }

  1368.     }else if(avctx->pix_fmt == PIX_FMT_RGB32){

  1369.         uint8_t *data = p->data[0] + (height-1)*p->linesize[0];

  1370.         const int stride = -p->linesize[0];

  1371.         const int fake_stride = -fake_ystride;

  1372.         int y;

  1373.         int leftr, leftg, leftb;

  1374. 

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

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

  1377.         put_bits(&s->pb, 8, leftb= data[B]);

  1378.         put_bits(&s->pb, 8, 0);

  1379. 

  1380.         sub_left_prediction_bgr32(s, s->temp[0], data+4, width-1, &leftr, &leftg, &leftb);

  1381.         encode_bgr_bitstream(s, width-1);

  1382. 

  1383.         for(y=1; y<s->height; y++){

  1384.             uint8_t *dst = data + y*stride;

  1385.             if(s->predictor == PLANE && s->interlaced < y){

  1386.                 s->dsp.diff_bytes(s->temp[1], dst, dst - fake_stride, width*4);

  1387.                 sub_left_prediction_bgr32(s, s->temp[0], s->temp[1], width, &leftr, &leftg, &leftb);

  1388.             }else{

  1389.                 sub_left_prediction_bgr32(s, s->temp[0], dst, width, &leftr, &leftg, &leftb);

  1390.             }

  1391.             encode_bgr_bitstream(s, width);

  1392.         }

  1393.     }else{

  1394.         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");

  1395.     }

  1396.     emms_c();

  1397. 

  1398.     size+= (put_bits_count(&s->pb)+31)/8;

  1399.     put_bits(&s->pb, 16, 0);

  1400.     put_bits(&s->pb, 15, 0);

  1401.     size/= 4;

  1402. 

  1403.     if((s->flags&CODEC_FLAG_PASS1) && (s->picture_number&31)==0){

  1404.         int j;

  1405.         char *p= avctx->stats_out;

  1406.         char *end= p + 1024*30;

  1407.         for(i=0; i<3; i++){

  1408.             for(j=0; j<256; j++){

  1409.                 snprintf(p, end-p, "%"PRIu64" ", s->stats[i][j]);

  1410.                 p+= strlen(p);

  1411.                 s->stats[i][j]= 0;

  1412.             }

  1413.             snprintf(p, end-p, "\n");

  1414.             p++;

  1415.         }

  1416.     } else

  1417.         avctx->stats_out[0] = '\0';

  1418.     if(!(s->avctx->flags2 & CODEC_FLAG2_NO_OUTPUT)){

  1419.         flush_put_bits(&s->pb);

  1420.         s->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, size);

  1421.     }

  1422. 

  1423.     s->picture_number++;

  1424. 

  1425.     return size*4;

  1426. }

  1427. 

  1428. static av_cold int encode_end(AVCodecContext *avctx)

  1429. {

  1430.     HYuvContext *s = avctx->priv_data;

  1431. 

  1432.     common_end(s);

  1433. 

  1434.     av_freep(&avctx->extradata);

  1435.     av_freep(&avctx->stats_out);

  1436. 

  1437.     return 0;

  1438. }

  1439. #endif /* CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER */

  1440. 

  1441. #if CONFIG_HUFFYUV_DECODER

  1442. AVCodec ff_huffyuv_decoder = {

  1443.     "huffyuv",

  1444.     AVMEDIA_TYPE_VIDEO,

  1445.     CODEC_ID_HUFFYUV,

  1446.     sizeof(HYuvContext),

  1447.     decode_init,

  1448.     NULL,

  1449.     decode_end,

  1450.     decode_frame,

  1451.     CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_FRAME_THREADS,

  1452.     NULL,

  1453.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  1454.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1455. };

  1456. #endif

  1457. 

  1458. #if CONFIG_FFVHUFF_DECODER

  1459. AVCodec ff_ffvhuff_decoder = {

  1460.     "ffvhuff",

  1461.     AVMEDIA_TYPE_VIDEO,

  1462.     CODEC_ID_FFVHUFF,

  1463.     sizeof(HYuvContext),

  1464.     decode_init,

  1465.     NULL,

  1466.     decode_end,

  1467.     decode_frame,

  1468.     CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_FRAME_THREADS,

  1469.     NULL,

  1470.     .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),

  1471.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1472. };

  1473. #endif

  1474. 

  1475. #if CONFIG_HUFFYUV_ENCODER

  1476. AVCodec ff_huffyuv_encoder = {

  1477.     "huffyuv",

  1478.     AVMEDIA_TYPE_VIDEO,

  1479.     CODEC_ID_HUFFYUV,

  1480.     sizeof(HYuvContext),

  1481.     encode_init,

  1482.     encode_frame,

  1483.     encode_end,

  1484.     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},

  1485.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1486. };

  1487. #endif

  1488. 

  1489. #if CONFIG_FFVHUFF_ENCODER

  1490. AVCodec ff_ffvhuff_encoder = {

  1491.     "ffvhuff",

  1492.     AVMEDIA_TYPE_VIDEO,

  1493.     CODEC_ID_FFVHUFF,

  1494.     sizeof(HYuvContext),

  1495.     encode_init,

  1496.     encode_frame,

  1497.     encode_end,

  1498.     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},

  1499.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1500. };

  1501. #endif