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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 "get_bits.h"

  33. #include "put_bits.h"

  34. #include "dsputil.h"

  35. 

  36. #define VLC_BITS 11

  37. 

  38. #ifdef WORDS_BIGENDIAN

  39. #define B 3

  40. #define G 2

  41. #define R 1

  42. #else

  43. #define B 0

  44. #define G 1

  45. #define R 2

  46. #endif

  47. 

  48. typedef enum Predictor{

  49.     LEFT= 0,

  50.     PLANE,

  51.     MEDIAN,

  52. } Predictor;

  53. 

  54. typedef struct HYuvContext{

  55.     AVCodecContext *avctx;

  56.     Predictor predictor;

  57.     GetBitContext gb;

  58.     PutBitContext pb;

  59.     int interlaced;

  60.     int decorrelate;

  61.     int bitstream_bpp;

  62.     int version;

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

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

  65.     int width, height;

  66.     int flags;

  67.     int context;

  68.     int picture_number;

  69.     int last_slice_end;

  70.     uint8_t *temp[3];

  71.     uint64_t stats[3][256];

  72.     uint8_t len[3][256];

  73.     uint32_t bits[3][256];

  74.     uint32_t pix_bgr_map[1<<VLC_BITS];

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

  76.     AVFrame picture;

  77.     uint8_t *bitstream_buffer;

  78.     unsigned int bitstream_buffer_size;

  79.     DSPContext dsp;

  80. }HYuvContext;

  81. 

  82. static const unsigned char classic_shift_luma[] = {

  83.   34,36,35,69,135,232,9,16,10,24,11,23,12,16,13,10,14,8,15,8,

  84.   16,8,17,20,16,10,207,206,205,236,11,8,10,21,9,23,8,8,199,70,

  85.   69,68, 0

  86. };

  87. 

  88. static const unsigned char classic_shift_chroma[] = {

  89.   66,36,37,38,39,40,41,75,76,77,110,239,144,81,82,83,84,85,118,183,

  90.   56,57,88,89,56,89,154,57,58,57,26,141,57,56,58,57,58,57,184,119,

  91.   214,245,116,83,82,49,80,79,78,77,44,75,41,40,39,38,37,36,34, 0

  92. };

  93. 

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

  95.     3,  9,  5, 12, 10, 35, 32, 29, 27, 50, 48, 45, 44, 41, 39, 37,

  96.    73, 70, 68, 65, 64, 61, 58, 56, 53, 50, 49, 46, 44, 41, 38, 36,

  97.    68, 65, 63, 61, 58, 55, 53, 51, 48, 46, 45, 43, 41, 39, 38, 36,

  98.    35, 33, 32, 30, 29, 27, 26, 25, 48, 47, 46, 44, 43, 41, 40, 39,

  99.    37, 36, 35, 34, 32, 31, 30, 28, 27, 26, 24, 23, 22, 20, 19, 37,

  100.    35, 34, 33, 31, 30, 29, 27, 26, 24, 23, 21, 20, 18, 17, 15, 29,

  101.    27, 26, 24, 22, 21, 19, 17, 16, 14, 26, 25, 23, 21, 19, 18, 16,

  102.    15, 27, 25, 23, 21, 19, 17, 16, 14, 26, 25, 23, 21, 18, 17, 14,

  103.    12, 17, 19, 13,  4,  9,  2, 11,  1,  7,  8,  0, 16,  3, 14,  6,

  104.    12, 10,  5, 15, 18, 11, 10, 13, 15, 16, 19, 20, 22, 24, 27, 15,

  105.    18, 20, 22, 24, 26, 14, 17, 20, 22, 24, 27, 15, 18, 20, 23, 25,

  106.    28, 16, 19, 22, 25, 28, 32, 36, 21, 25, 29, 33, 38, 42, 45, 49,

  107.    28, 31, 34, 37, 40, 42, 44, 47, 49, 50, 52, 54, 56, 57, 59, 60,

  108.    62, 64, 66, 67, 69, 35, 37, 39, 40, 42, 43, 45, 47, 48, 51, 52,

  109.    54, 55, 57, 59, 60, 62, 63, 66, 67, 69, 71, 72, 38, 40, 42, 43,

  110.    46, 47, 49, 51, 26, 28, 30, 31, 33, 34, 18, 19, 11, 13,  7,  8,

  111. };

  112. 

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

  114.     3,  1,  2,  2,  2,  2,  3,  3,  7,  5,  7,  5,  8,  6, 11,  9,

  115.     7, 13, 11, 10,  9,  8,  7,  5,  9,  7,  6,  4,  7,  5,  8,  7,

  116.    11,  8, 13, 11, 19, 15, 22, 23, 20, 33, 32, 28, 27, 29, 51, 77,

  117.    43, 45, 76, 81, 46, 82, 75, 55, 56,144, 58, 80, 60, 74,147, 63,

  118.   143, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,

  119.    80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 27, 30, 21, 22,

  120.    17, 14,  5,  6,100, 54, 47, 50, 51, 53,106,107,108,109,110,111,

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

  122.     0,129,130,131,120,119,126,125,136,137,138,139,140,141,142,134,

  123.   135,132,133,104, 64,101, 62, 57,102, 95, 93, 59, 61, 28, 97, 96,

  124.    52, 49, 48, 29, 32, 25, 24, 46, 23, 98, 45, 44, 43, 20, 42, 41,

  125.    19, 18, 99, 40, 15, 39, 38, 16, 13, 12, 11, 37, 10,  9,  8, 36,

  126.     7,128,127,105,123,116, 35, 34, 33,145, 31, 79, 42,146, 78, 26,

  127.    83, 48, 49, 50, 44, 47, 26, 31, 30, 18, 17, 19, 21, 24, 25, 13,

  128.    14, 16, 17, 18, 20, 21, 12, 14, 15,  9, 10,  6,  9,  6,  5,  8,

  129.     6, 12,  8, 10,  7,  9,  6,  4,  6,  2,  2,  3,  3,  3,  3,  2,

  130. };

  131. 

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

  133.     int i;

  134. 

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

  136.         acc+= src[i];

  137.         dst[i]= acc;

  138.         i++;

  139.         acc+= src[i];

  140.         dst[i]= acc;

  141.     }

  142. 

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

  144.         acc+= src[i];

  145.         dst[i]= acc;

  146.     }

  147. 

  148.     return acc;

  149. }

  150. 

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

  152.     int i;

  153.     int r,g,b;

  154.     r= *red;

  155.     g= *green;

  156.     b= *blue;

  157. 

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

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

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

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

  162. 

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

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

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

  166.     }

  167. 

  168.     *red= r;

  169.     *green= g;

  170.     *blue= b;

  171. }

  172. 

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

  174.     int i;

  175.     if(w<32){

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

  177.             const int temp= src[i];

  178.             dst[i]= temp - left;

  179.             left= temp;

  180.         }

  181.         return left;

  182.     }else{

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

  184.             const int temp= src[i];

  185.             dst[i]= temp - left;

  186.             left= temp;

  187.         }

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

  189.         return src[w-1];

  190.     }

  191. }

  192. 

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

  194.     int i;

  195.     int r,g,b;

  196.     r= *red;

  197.     g= *green;

  198.     b= *blue;

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

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

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

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

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

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

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

  206.         r = rt;

  207.         g = gt;

  208.         b = bt;

  209.     }

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

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

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

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

  214. }

  215. 

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

  217.     int i, val, repeat;

  218. 

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

  220.         repeat= get_bits(gb, 3);

  221.         val   = get_bits(gb, 5);

  222.         if(repeat==0)

  223.             repeat= get_bits(gb, 8);

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

  225.         while (repeat--)

  226.             dst[i++] = val;

  227.     }

  228. }

  229. 

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

  231.     int len, index;

  232.     uint32_t bits=0;

  233. 

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

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

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

  237.                 dst[index]= bits++;

  238.         }

  239.         if(bits & 1){

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

  241.             return -1;

  242.         }

  243.         bits >>= 1;

  244.     }

  245.     return 0;

  246. }

  247. 

  248. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  249. typedef struct {

  250.     uint64_t val;

  251.     int name;

  252. } HeapElem;

  253. 

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

  255. {

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

  257.         int child = root*2+1;

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

  259.             child++;

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

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

  262.             root = child;

  263.         } else

  264.             break;

  265.     }

  266. }

  267. 

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

  269.     HeapElem h[size];

  270.     int up[2*size];

  271.     int len[2*size];

  272.     int offset, i, next;

  273. 

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

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

  276.             h[i].name = i;

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

  278.         }

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

  280.             heap_sift(h, i, size);

  281. 

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

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

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

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

  286.             h[0].val = INT64_MAX;

  287.             heap_sift(h, 0, size);

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

  289.             h[0].name = next;

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

  291.             heap_sift(h, 0, size);

  292.         }

  293. 

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

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

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

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

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

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

  300.         }

  301.         if(i==size) break;

  302.     }

  303. }

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

  305. 

  306. static void generate_joint_tables(HYuvContext *s){

  307.     uint16_t symbols[1<<VLC_BITS];

  308.     uint16_t bits[1<<VLC_BITS];

  309.     uint8_t len[1<<VLC_BITS];

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

  311.         int p, i, y, u;

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

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

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

  315.                 int limit = VLC_BITS - len0;

  316.                 if(limit <= 0)

  317.                     continue;

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

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

  320.                     if(len1 > limit)

  321.                         continue;

  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)

  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)

  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)

  354.                         continue;

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

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

  357.                     if(s->decorrelate){

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

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

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

  361.                     }else{

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

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

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

  365.                     }

  366.                     i++;

  367.                 }

  368.             }

  369.         }

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

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

  372.     }

  373. }

  374. 

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

  376.     GetBitContext gb;

  377.     int i;

  378. 

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

  380. 

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

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

  383. 

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

  385.             return -1;

  386.         }

  387. #if 0

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

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

  390. }

  391. #endif

  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 (get_bits_count(&gb)+7)/8;

  399. }

  400. 

  401. static int read_old_huffman_tables(HYuvContext *s){

  402. #if 1

  403.     GetBitContext gb;

  404.     int i;

  405. 

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

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

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

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

  410. 

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

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

  413. 

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

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

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

  417.     }

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

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

  420. 

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

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

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

  424.     }

  425. 

  426.     generate_joint_tables(s);

  427. 

  428.     return 0;

  429. #else

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

  431.     return -1;

  432. #endif

  433. }

  434. 

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

  436.     int i;

  437. 

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

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

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

  441.         }

  442.     }else{

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

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

  445.         }

  446.     }

  447. }

  448. 

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

  450.     HYuvContext *s = avctx->priv_data;

  451. 

  452.     s->avctx= avctx;

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

  454. 

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

  456. 

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

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

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

  460. 

  461.     return 0;

  462. }

  463. 

  464. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

  465. static av_cold int decode_init(AVCodecContext *avctx)

  466. {

  467.     HYuvContext *s = avctx->priv_data;

  468. 

  469.     common_init(avctx);

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

  471. 

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

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

  474. 

  475. s->bgr32=1;

  476. //if(avctx->extradata)

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

  478.     if(avctx->extradata_size){

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

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

  481.         else

  482.             s->version=2;

  483.     }else

  484.         s->version=0;

  485. 

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

  487.         int method, interlace;

  488. 

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

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

  491.         s->predictor= method&63;

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

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

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

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

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

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

  498. 

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

  500.             return -1;

  501.     }else{

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

  503.         case 1:

  504.             s->predictor= LEFT;

  505.             s->decorrelate= 0;

  506.             break;

  507.         case 2:

  508.             s->predictor= LEFT;

  509.             s->decorrelate= 1;

  510.             break;

  511.         case 3:

  512.             s->predictor= PLANE;

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

  514.             break;

  515.         case 4:

  516.             s->predictor= MEDIAN;

  517.             s->decorrelate= 0;

  518.             break;

  519.         default:

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

  521.             s->decorrelate= 0;

  522.             break;

  523.         }

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

  525.         s->context= 0;

  526. 

  527.         if(read_old_huffman_tables(s) < 0)

  528.             return -1;

  529.     }

  530. 

  531.     switch(s->bitstream_bpp){

  532.     case 12:

  533.         avctx->pix_fmt = PIX_FMT_YUV420P;

  534.         break;

  535.     case 16:

  536.         if(s->yuy2){

  537.             avctx->pix_fmt = PIX_FMT_YUYV422;

  538.         }else{

  539.             avctx->pix_fmt = PIX_FMT_YUV422P;

  540.         }

  541.         break;

  542.     case 24:

  543.     case 32:

  544.         if(s->bgr32){

  545.             avctx->pix_fmt = PIX_FMT_RGB32;

  546.         }else{

  547.             avctx->pix_fmt = PIX_FMT_BGR24;

  548.         }

  549.         break;

  550.     default:

  551.         assert(0);

  552.     }

  553. 

  554.     alloc_temp(s);

  555. 

  556. //    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);

  557. 

  558.     return 0;

  559. }

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

  561. 

  562. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

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

  564.     int i;

  565.     int index= 0;

  566. 

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

  568.         int val= len[i];

  569.         int repeat=0;

  570. 

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

  572.             repeat++;

  573. 

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

  575.         if(repeat>7){

  576.             buf[index++]= val;

  577.             buf[index++]= repeat;

  578.         }else{

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

  580.         }

  581.     }

  582. 

  583.     return index;

  584. }

  585. 

  586. static av_cold int encode_init(AVCodecContext *avctx)

  587. {

  588.     HYuvContext *s = avctx->priv_data;

  589.     int i, j;

  590. 

  591.     common_init(avctx);

  592. 

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

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

  595.     s->version=2;

  596. 

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

  598. 

  599.     switch(avctx->pix_fmt){

  600.     case PIX_FMT_YUV420P:

  601.         s->bitstream_bpp= 12;

  602.         break;

  603.     case PIX_FMT_YUV422P:

  604.         s->bitstream_bpp= 16;

  605.         break;

  606.     case PIX_FMT_RGB32:

  607.         s->bitstream_bpp= 24;

  608.         break;

  609.     default:

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

  611.         return -1;

  612.     }

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

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

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

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

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

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

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

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

  621.             return -1;

  622.         }

  623.     }else s->context= 0;

  624. 

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

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

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

  628.             return -1;

  629.         }

  630.         if(avctx->context_model){

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

  632.             return -1;

  633.         }

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

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

  636.     }

  637. 

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

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

  640.         return -1;

  641.     }

  642. 

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

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

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

  646.     if(s->context)

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

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

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

  650. 

  651.     if(avctx->stats_in){

  652.         char *p= avctx->stats_in;

  653. 

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

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

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

  657. 

  658.         for(;;){

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

  660.                 char *next;

  661. 

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

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

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

  665.                     p=next;

  666.                 }

  667.             }

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

  669.         }

  670.     }else{

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

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

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

  674. 

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

  676.             }

  677.     }

  678. 

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

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

  681. 

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

  683.             return -1;

  684.         }

  685. 

  686.         s->avctx->extradata_size+=

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

  688.     }

  689. 

  690.     if(s->context){

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

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

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

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

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

  696.             }

  697.         }

  698.     }else{

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

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

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

  702.     }

  703. 

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

  705. 

  706.     alloc_temp(s);

  707. 

  708.     s->picture_number=0;

  709. 

  710.     return 0;

  711. }

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

  713. 

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

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

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

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

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

  719.         dst0 = code>>8;\

  720.         dst1 = code;\

  721.     }else{\

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

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

  724.     }\

  725. }

  726. 

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

  728.     int i;

  729. 

  730.     count/=2;

  731. 

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

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

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

  735.     }

  736. }

  737. 

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

  739.     int i;

  740. 

  741.     count/=2;

  742. 

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

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

  745.     }

  746. }

  747. 

  748. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

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

  750.     int i;

  751. 

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

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

  754.         return -1;

  755.     }

  756. 

  757. #define LOAD4\

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

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

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

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

  762. 

  763.     count/=2;

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

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

  766.             LOAD4;

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

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

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

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

  771.         }

  772.     }

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

  774.         return 0;

  775.     if(s->context){

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

  777.             LOAD4;

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

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

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

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

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

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

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

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

  786.         }

  787.     }else{

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

  789.             LOAD4;

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

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

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

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

  794.         }

  795.     }

  796.     return 0;

  797. }

  798. 

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

  800.     int i;

  801. 

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

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

  804.         return -1;

  805.     }

  806. 

  807. #define LOAD2\

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

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

  810. #define STAT2\

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

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

  813. #define WRITE2\

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

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

  816. 

  817.     count/=2;

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

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

  820.             LOAD2;

  821.             STAT2;

  822.         }

  823.     }

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

  825.         return 0;

  826. 

  827.     if(s->context){

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

  829.             LOAD2;

  830.             STAT2;

  831.             WRITE2;

  832.         }

  833.     }else{

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

  835.             LOAD2;

  836.             WRITE2;

  837.         }

  838.     }

  839.     return 0;

  840. }

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

  842. 

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

  844.     int i;

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

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

  847.         if(code != -1){

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

  849.         }else if(decorrelate){

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

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

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

  853.         }else{

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

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

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

  857.         }

  858.         if(alpha)

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

  860.     }

  861. }

  862. 

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

  864.     if(s->decorrelate){

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

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

  867.         else

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

  869.     }else{

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

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

  872.         else

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

  874.     }

  875. }

  876. 

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

  878.     int i;

  879. 

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

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

  882.         return -1;

  883.     }

  884. 

  885. #define LOAD3\

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

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

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

  889. #define STAT3\

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

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

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

  893. #define WRITE3\

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

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

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

  897. 

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

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

  900.             LOAD3;

  901.             STAT3;

  902.         }

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

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

  905.             LOAD3;

  906.             STAT3;

  907.             WRITE3;

  908.         }

  909.     }else{

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

  911.             LOAD3;

  912.             WRITE3;

  913.         }

  914.     }

  915.     return 0;

  916. }

  917. 

  918. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

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

  920.     int h, cy;

  921.     int offset[4];

  922. 

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

  924.         return;

  925. 

  926.     h= y - s->last_slice_end;

  927.     y -= h;

  928. 

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

  930.         cy= y>>1;

  931.     }else{

  932.         cy= y;

  933.     }

  934. 

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

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

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

  938.     offset[3] = 0;

  939.     emms_c();

  940. 

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

  942. 

  943.     s->last_slice_end= y + h;

  944. }

  945. 

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

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

  948.     int buf_size = avpkt->size;

  949.     HYuvContext *s = avctx->priv_data;

  950.     const int width= s->width;

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

  952.     const int height= s->height;

  953.     int fake_ystride, fake_ustride, fake_vstride;

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

  955.     int table_size= 0;

  956. 

  957.     AVFrame *picture = data;

  958. 

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

  960.     if (!s->bitstream_buffer)

  961.         return AVERROR(ENOMEM);

  962. 

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

  964. 

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

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

  967. 

  968.     p->reference= 0;

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

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

  971.         return -1;

  972.     }

  973. 

  974.     if(s->context){

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

  976.         if(table_size < 0)

  977.             return -1;

  978.     }

  979. 

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

  981.         return -1;

  982. 

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

  984. 

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

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

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

  988. 

  989.     s->last_slice_end= 0;

  990. 

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

  992.         int y, cy;

  993.         int lefty, leftu, leftv;

  994.         int lefttopy, lefttopu, lefttopv;

  995. 

  996.         if(s->yuy2){

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

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

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

  1000.             p->data[0][0]= get_bits(&s->gb, 8);

  1001. 

  1002.             av_log(avctx, AV_LOG_ERROR, "YUY2 output is not implemented yet\n");

  1003.             return -1;

  1004.         }else{

  1005. 

  1006.             leftv= p->data[2][0]= get_bits(&s->gb, 8);

  1007.             lefty= p->data[0][1]= get_bits(&s->gb, 8);

  1008.             leftu= p->data[1][0]= get_bits(&s->gb, 8);

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

  1010. 

  1011.             switch(s->predictor){

  1012.             case LEFT:

  1013.             case PLANE:

  1014.                 decode_422_bitstream(s, width-2);

  1015.                 lefty= add_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);

  1016.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1017.                     leftu= add_left_prediction(p->data[1] + 1, s->temp[1], width2-1, leftu);

  1018.                     leftv= add_left_prediction(p->data[2] + 1, s->temp[2], width2-1, leftv);

  1019.                 }

  1020. 

  1021.                 for(cy=y=1; y<s->height; y++,cy++){

  1022.                     uint8_t *ydst, *udst, *vdst;

  1023. 

  1024.                     if(s->bitstream_bpp==12){

  1025.                         decode_gray_bitstream(s, width);

  1026. 

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

  1028. 

  1029.                         lefty= add_left_prediction(ydst, s->temp[0], width, lefty);

  1030.                         if(s->predictor == PLANE){

  1031.                             if(y>s->interlaced)

  1032.                                 s->dsp.add_bytes(ydst, ydst - fake_ystride, width);

  1033.                         }

  1034.                         y++;

  1035.                         if(y>=s->height) break;

  1036.                     }

  1037. 

  1038.                     draw_slice(s, y);

  1039. 

  1040.                     ydst= p->data[0] + p->linesize[0]*y;

  1041.                     udst= p->data[1] + p->linesize[1]*cy;

  1042.                     vdst= p->data[2] + p->linesize[2]*cy;

  1043. 

  1044.                     decode_422_bitstream(s, width);

  1045.                     lefty= add_left_prediction(ydst, s->temp[0], width, lefty);

  1046.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1047.                         leftu= add_left_prediction(udst, s->temp[1], width2, leftu);

  1048.                         leftv= add_left_prediction(vdst, s->temp[2], width2, leftv);

  1049.                     }

  1050.                     if(s->predictor == PLANE){

  1051.                         if(cy>s->interlaced){

  1052.                             s->dsp.add_bytes(ydst, ydst - fake_ystride, width);

  1053.                             if(!(s->flags&CODEC_FLAG_GRAY)){

  1054.                                 s->dsp.add_bytes(udst, udst - fake_ustride, width2);

  1055.                                 s->dsp.add_bytes(vdst, vdst - fake_vstride, width2);

  1056.                             }

  1057.                         }

  1058.                     }

  1059.                 }

  1060.                 draw_slice(s, height);

  1061. 

  1062.                 break;

  1063.             case MEDIAN:

  1064.                 /* first line except first 2 pixels is left predicted */

  1065.                 decode_422_bitstream(s, width-2);

  1066.                 lefty= add_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);

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

  1068.                     leftu= add_left_prediction(p->data[1] + 1, s->temp[1], width2-1, leftu);

  1069.                     leftv= add_left_prediction(p->data[2] + 1, s->temp[2], width2-1, leftv);

  1070.                 }

  1071. 

  1072.                 cy=y=1;

  1073. 

  1074.                 /* second line is left predicted for interlaced case */

  1075.                 if(s->interlaced){

  1076.                     decode_422_bitstream(s, width);

  1077.                     lefty= add_left_prediction(p->data[0] + p->linesize[0], s->temp[0], width, lefty);

  1078.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1079.                         leftu= add_left_prediction(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);

  1080.                         leftv= add_left_prediction(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);

  1081.                     }

  1082.                     y++; cy++;

  1083.                 }

  1084. 

  1085.                 /* next 4 pixels are left predicted too */

  1086.                 decode_422_bitstream(s, 4);

  1087.                 lefty= add_left_prediction(p->data[0] + fake_ystride, s->temp[0], 4, lefty);

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

  1089.                     leftu= add_left_prediction(p->data[1] + fake_ustride, s->temp[1], 2, leftu);

  1090.                     leftv= add_left_prediction(p->data[2] + fake_vstride, s->temp[2], 2, leftv);

  1091.                 }

  1092. 

  1093.                 /* next line except the first 4 pixels is median predicted */

  1094.                 lefttopy= p->data[0][3];

  1095.                 decode_422_bitstream(s, width-4);

  1096.                 s->dsp.add_hfyu_median_prediction(p->data[0] + fake_ystride+4, p->data[0]+4, s->temp[0], width-4, &lefty, &lefttopy);

  1097.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1098.                     lefttopu= p->data[1][1];

  1099.                     lefttopv= p->data[2][1];

  1100.                     s->dsp.add_hfyu_median_prediction(p->data[1] + fake_ustride+2, p->data[1]+2, s->temp[1], width2-2, &leftu, &lefttopu);

  1101.                     s->dsp.add_hfyu_median_prediction(p->data[2] + fake_vstride+2, p->data[2]+2, s->temp[2], width2-2, &leftv, &lefttopv);

  1102.                 }

  1103.                 y++; cy++;

  1104. 

  1105.                 for(; y<height; y++,cy++){

  1106.                     uint8_t *ydst, *udst, *vdst;

  1107. 

  1108.                     if(s->bitstream_bpp==12){

  1109.                         while(2*cy > y){

  1110.                             decode_gray_bitstream(s, width);

  1111.                             ydst= p->data[0] + p->linesize[0]*y;

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

  1113.                             y++;

  1114.                         }

  1115.                         if(y>=height) break;

  1116.                     }

  1117.                     draw_slice(s, y);

  1118. 

  1119.                     decode_422_bitstream(s, width);

  1120. 

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

  1122.                     udst= p->data[1] + p->linesize[1]*cy;

  1123.                     vdst= p->data[2] + p->linesize[2]*cy;

  1124. 

  1125.                     s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);

  1126.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1127.                         s->dsp.add_hfyu_median_prediction(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);

  1128.                         s->dsp.add_hfyu_median_prediction(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);

  1129.                     }

  1130.                 }

  1131. 

  1132.                 draw_slice(s, height);

  1133.                 break;

  1134.             }

  1135.         }

  1136.     }else{

  1137.         int y;

  1138.         int leftr, leftg, leftb;

  1139.         const int last_line= (height-1)*p->linesize[0];

  1140. 

  1141.         if(s->bitstream_bpp==32){

  1142.             skip_bits(&s->gb, 8);

  1143.             leftr= p->data[0][last_line+R]= get_bits(&s->gb, 8);

  1144.             leftg= p->data[0][last_line+G]= get_bits(&s->gb, 8);

  1145.             leftb= p->data[0][last_line+B]= get_bits(&s->gb, 8);

  1146.         }else{

  1147.             leftr= p->data[0][last_line+R]= get_bits(&s->gb, 8);

  1148.             leftg= p->data[0][last_line+G]= get_bits(&s->gb, 8);

  1149.             leftb= p->data[0][last_line+B]= get_bits(&s->gb, 8);

  1150.             skip_bits(&s->gb, 8);

  1151.         }

  1152. 

  1153.         if(s->bgr32){

  1154.             switch(s->predictor){

  1155.             case LEFT:

  1156.             case PLANE:

  1157.                 decode_bgr_bitstream(s, width-1);

  1158.                 add_left_prediction_bgr32(p->data[0] + last_line+4, s->temp[0], width-1, &leftr, &leftg, &leftb);

  1159. 

  1160.                 for(y=s->height-2; y>=0; y--){ //Yes it is stored upside down.

  1161.                     decode_bgr_bitstream(s, width);

  1162. 

  1163.                     add_left_prediction_bgr32(p->data[0] + p->linesize[0]*y, s->temp[0], width, &leftr, &leftg, &leftb);

  1164.                     if(s->predictor == PLANE){

  1165.                         if((y&s->interlaced)==0 && y<s->height-1-s->interlaced){

  1166.                             s->dsp.add_bytes(p->data[0] + p->linesize[0]*y,

  1167.                                              p->data[0] + p->linesize[0]*y + fake_ystride, fake_ystride);

  1168.                         }

  1169.                     }

  1170.                 }

  1171.                 draw_slice(s, height); // just 1 large slice as this is not possible in reverse order

  1172.                 break;

  1173.             default:

  1174.                 av_log(avctx, AV_LOG_ERROR, "prediction type not supported!\n");

  1175.             }

  1176.         }else{

  1177. 

  1178.             av_log(avctx, AV_LOG_ERROR, "BGR24 output is not implemented yet\n");

  1179.             return -1;

  1180.         }

  1181.     }

  1182.     emms_c();

  1183. 

  1184.     *picture= *p;

  1185.     *data_size = sizeof(AVFrame);

  1186. 

  1187.     return (get_bits_count(&s->gb)+31)/32*4 + table_size;

  1188. }

  1189. #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */

  1190. 

  1191. static int common_end(HYuvContext *s){

  1192.     int i;

  1193. 

  1194.     for(i=0; i<3; i++){

  1195.         av_freep(&s->temp[i]);

  1196.     }

  1197.     return 0;

  1198. }

  1199. 

  1200. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

  1201. static av_cold int decode_end(AVCodecContext *avctx)

  1202. {

  1203.     HYuvContext *s = avctx->priv_data;

  1204.     int i;

  1205. 

  1206.     common_end(s);

  1207.     av_freep(&s->bitstream_buffer);

  1208. 

  1209.     for(i=0; i<6; i++){

  1210.         free_vlc(&s->vlc[i]);

  1211.     }

  1212. 

  1213.     return 0;

  1214. }

  1215. #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */

  1216. 

  1217. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  1218. static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

  1219.     HYuvContext *s = avctx->priv_data;

  1220.     AVFrame *pict = data;

  1221.     const int width= s->width;

  1222.     const int width2= s->width>>1;

  1223.     const int height= s->height;

  1224.     const int fake_ystride= s->interlaced ? pict->linesize[0]*2  : pict->linesize[0];

  1225.     const int fake_ustride= s->interlaced ? pict->linesize[1]*2  : pict->linesize[1];

  1226.     const int fake_vstride= s->interlaced ? pict->linesize[2]*2  : pict->linesize[2];

  1227.     AVFrame * const p= &s->picture;

  1228.     int i, j, size=0;

  1229. 

  1230.     *p = *pict;

  1231.     p->pict_type= FF_I_TYPE;

  1232.     p->key_frame= 1;

  1233. 

  1234.     if(s->context){

  1235.         for(i=0; i<3; i++){

  1236.             generate_len_table(s->len[i], s->stats[i], 256);

  1237.             if(generate_bits_table(s->bits[i], s->len[i])<0)

  1238.                 return -1;

  1239.             size+= store_table(s, s->len[i], &buf[size]);

  1240.         }

  1241. 

  1242.         for(i=0; i<3; i++)

  1243.             for(j=0; j<256; j++)

  1244.                 s->stats[i][j] >>= 1;

  1245.     }

  1246. 

  1247.     init_put_bits(&s->pb, buf+size, buf_size-size);

  1248. 

  1249.     if(avctx->pix_fmt == PIX_FMT_YUV422P || avctx->pix_fmt == PIX_FMT_YUV420P){

  1250.         int lefty, leftu, leftv, y, cy;

  1251. 

  1252.         put_bits(&s->pb, 8, leftv= p->data[2][0]);

  1253.         put_bits(&s->pb, 8, lefty= p->data[0][1]);

  1254.         put_bits(&s->pb, 8, leftu= p->data[1][0]);

  1255.         put_bits(&s->pb, 8,        p->data[0][0]);

  1256. 

  1257.         lefty= sub_left_prediction(s, s->temp[0], p->data[0]+2, width-2 , lefty);

  1258.         leftu= sub_left_prediction(s, s->temp[1], p->data[1]+1, width2-1, leftu);

  1259.         leftv= sub_left_prediction(s, s->temp[2], p->data[2]+1, width2-1, leftv);

  1260. 

  1261.         encode_422_bitstream(s, width-2);

  1262. 

  1263.         if(s->predictor==MEDIAN){

  1264.             int lefttopy, lefttopu, lefttopv;

  1265.             cy=y=1;

  1266.             if(s->interlaced){

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

  1268.                 leftu= sub_left_prediction(s, s->temp[1], p->data[1]+p->linesize[1], width2, leftu);

  1269.                 leftv= sub_left_prediction(s, s->temp[2], p->data[2]+p->linesize[2], width2, leftv);

  1270. 

  1271.                 encode_422_bitstream(s, width);

  1272.                 y++; cy++;

  1273.             }

  1274. 

  1275.             lefty= sub_left_prediction(s, s->temp[0], p->data[0]+fake_ystride, 4, lefty);

  1276.             leftu= sub_left_prediction(s, s->temp[1], p->data[1]+fake_ustride, 2, leftu);

  1277.             leftv= sub_left_prediction(s, s->temp[2], p->data[2]+fake_vstride, 2, leftv);

  1278. 

  1279.             encode_422_bitstream(s, 4);

  1280. 

  1281.             lefttopy= p->data[0][3];

  1282.             lefttopu= p->data[1][1];

  1283.             lefttopv= p->data[2][1];

  1284.             s->dsp.sub_hfyu_median_prediction(s->temp[0], p->data[0]+4, p->data[0] + fake_ystride+4, width-4 , &lefty, &lefttopy);

  1285.             s->dsp.sub_hfyu_median_prediction(s->temp[1], p->data[1]+2, p->data[1] + fake_ustride+2, width2-2, &leftu, &lefttopu);

  1286.             s->dsp.sub_hfyu_median_prediction(s->temp[2], p->data[2]+2, p->data[2] + fake_vstride+2, width2-2, &leftv, &lefttopv);

  1287.             encode_422_bitstream(s, width-4);

  1288.             y++; cy++;

  1289. 

  1290.             for(; y<height; y++,cy++){

  1291.                 uint8_t *ydst, *udst, *vdst;

  1292. 

  1293.                 if(s->bitstream_bpp==12){

  1294.                     while(2*cy > y){

  1295.                         ydst= p->data[0] + p->linesize[0]*y;

  1296.                         s->dsp.sub_hfyu_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);

  1297.                         encode_gray_bitstream(s, width);

  1298.                         y++;

  1299.                     }

  1300.                     if(y>=height) break;

  1301.                 }

  1302.                 ydst= p->data[0] + p->linesize[0]*y;

  1303.                 udst= p->data[1] + p->linesize[1]*cy;

  1304.                 vdst= p->data[2] + p->linesize[2]*cy;

  1305. 

  1306.                 s->dsp.sub_hfyu_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);

  1307.                 s->dsp.sub_hfyu_median_prediction(s->temp[1], udst - fake_ustride, udst, width2, &leftu, &lefttopu);

  1308.                 s->dsp.sub_hfyu_median_prediction(s->temp[2], vdst - fake_vstride, vdst, width2, &leftv, &lefttopv);

  1309. 

  1310.                 encode_422_bitstream(s, width);

  1311.             }

  1312.         }else{

  1313.             for(cy=y=1; y<height; y++,cy++){

  1314.                 uint8_t *ydst, *udst, *vdst;

  1315. 

  1316.                 /* encode a luma only line & y++ */

  1317.                 if(s->bitstream_bpp==12){

  1318.                     ydst= p->data[0] + p->linesize[0]*y;

  1319. 

  1320.                     if(s->predictor == PLANE && s->interlaced < y){

  1321.                         s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);

  1322. 

  1323.                         lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);

  1324.                     }else{

  1325.                         lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);

  1326.                     }

  1327.                     encode_gray_bitstream(s, width);

  1328.                     y++;

  1329.                     if(y>=height) break;

  1330.                 }

  1331. 

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

  1333.                 udst= p->data[1] + p->linesize[1]*cy;

  1334.                 vdst= p->data[2] + p->linesize[2]*cy;

  1335. 

  1336.                 if(s->predictor == PLANE && s->interlaced < cy){

  1337.                     s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);

  1338.                     s->dsp.diff_bytes(s->temp[2], udst, udst - fake_ustride, width2);

  1339.                     s->dsp.diff_bytes(s->temp[2] + width2, vdst, vdst - fake_vstride, width2);

  1340. 

  1341.                     lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);

  1342.                     leftu= sub_left_prediction(s, s->temp[1], s->temp[2], width2, leftu);

  1343.                     leftv= sub_left_prediction(s, s->temp[2], s->temp[2] + width2, width2, leftv);

  1344.                 }else{

  1345.                     lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);

  1346.                     leftu= sub_left_prediction(s, s->temp[1], udst, width2, leftu);

  1347.                     leftv= sub_left_prediction(s, s->temp[2], vdst, width2, leftv);

  1348.                 }

  1349. 

  1350.                 encode_422_bitstream(s, width);

  1351.             }

  1352.         }

  1353.     }else if(avctx->pix_fmt == PIX_FMT_RGB32){

  1354.         uint8_t *data = p->data[0] + (height-1)*p->linesize[0];

  1355.         const int stride = -p->linesize[0];

  1356.         const int fake_stride = -fake_ystride;

  1357.         int y;

  1358.         int leftr, leftg, leftb;

  1359. 

  1360.         put_bits(&s->pb, 8, leftr= data[R]);

  1361.         put_bits(&s->pb, 8, leftg= data[G]);

  1362.         put_bits(&s->pb, 8, leftb= data[B]);

  1363.         put_bits(&s->pb, 8, 0);

  1364. 

  1365.         sub_left_prediction_bgr32(s, s->temp[0], data+4, width-1, &leftr, &leftg, &leftb);

  1366.         encode_bgr_bitstream(s, width-1);

  1367. 

  1368.         for(y=1; y<s->height; y++){

  1369.             uint8_t *dst = data + y*stride;

  1370.             if(s->predictor == PLANE && s->interlaced < y){

  1371.                 s->dsp.diff_bytes(s->temp[1], dst, dst - fake_stride, width*4);

  1372.                 sub_left_prediction_bgr32(s, s->temp[0], s->temp[1], width, &leftr, &leftg, &leftb);

  1373.             }else{

  1374.                 sub_left_prediction_bgr32(s, s->temp[0], dst, width, &leftr, &leftg, &leftb);

  1375.             }

  1376.             encode_bgr_bitstream(s, width);

  1377.         }

  1378.     }else{

  1379.         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");

  1380.     }

  1381.     emms_c();

  1382. 

  1383.     size+= (put_bits_count(&s->pb)+31)/8;

  1384.     put_bits(&s->pb, 16, 0);

  1385.     put_bits(&s->pb, 15, 0);

  1386.     size/= 4;

  1387. 

  1388.     if((s->flags&CODEC_FLAG_PASS1) && (s->picture_number&31)==0){

  1389.         int j;

  1390.         char *p= avctx->stats_out;

  1391.         char *end= p + 1024*30;

  1392.         for(i=0; i<3; i++){

  1393.             for(j=0; j<256; j++){

  1394.                 snprintf(p, end-p, "%"PRIu64" ", s->stats[i][j]);

  1395.                 p+= strlen(p);

  1396.                 s->stats[i][j]= 0;

  1397.             }

  1398.             snprintf(p, end-p, "\n");

  1399.             p++;

  1400.         }

  1401.     } else

  1402.         avctx->stats_out[0] = '\0';

  1403.     if(!(s->avctx->flags2 & CODEC_FLAG2_NO_OUTPUT)){

  1404.         flush_put_bits(&s->pb);

  1405.         s->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, size);

  1406.     }

  1407. 

  1408.     s->picture_number++;

  1409. 

  1410.     return size*4;

  1411. }

  1412. 

  1413. static av_cold int encode_end(AVCodecContext *avctx)

  1414. {

  1415.     HYuvContext *s = avctx->priv_data;

  1416. 

  1417.     common_end(s);

  1418. 

  1419.     av_freep(&avctx->extradata);

  1420.     av_freep(&avctx->stats_out);

  1421. 

  1422.     return 0;

  1423. }

  1424. #endif /* CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER */

  1425. 

  1426. #if CONFIG_HUFFYUV_DECODER

  1427. AVCodec huffyuv_decoder = {

  1428.     "huffyuv",

  1429.     CODEC_TYPE_VIDEO,

  1430.     CODEC_ID_HUFFYUV,

  1431.     sizeof(HYuvContext),

  1432.     decode_init,

  1433.     NULL,

  1434.     decode_end,

  1435.     decode_frame,

  1436.     CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,

  1437.     NULL,

  1438.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1439. };

  1440. #endif

  1441. 

  1442. #if CONFIG_FFVHUFF_DECODER

  1443. AVCodec ffvhuff_decoder = {

  1444.     "ffvhuff",

  1445.     CODEC_TYPE_VIDEO,

  1446.     CODEC_ID_FFVHUFF,

  1447.     sizeof(HYuvContext),

  1448.     decode_init,

  1449.     NULL,

  1450.     decode_end,

  1451.     decode_frame,

  1452.     CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,

  1453.     NULL,

  1454.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1455. };

  1456. #endif

  1457. 

  1458. #if CONFIG_HUFFYUV_ENCODER

  1459. AVCodec huffyuv_encoder = {

  1460.     "huffyuv",

  1461.     CODEC_TYPE_VIDEO,

  1462.     CODEC_ID_HUFFYUV,

  1463.     sizeof(HYuvContext),

  1464.     encode_init,

  1465.     encode_frame,

  1466.     encode_end,

  1467.     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},

  1468.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1469. };

  1470. #endif

  1471. 

  1472. #if CONFIG_FFVHUFF_ENCODER

  1473. AVCodec ffvhuff_encoder = {

  1474.     "ffvhuff",

  1475.     CODEC_TYPE_VIDEO,

  1476.     CODEC_ID_FFVHUFF,

  1477.     sizeof(HYuvContext),

  1478.     encode_init,

  1479.     encode_frame,

  1480.     encode_end,

  1481.     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},

  1482.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1483. };

  1484. #endif