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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. #if HAVE_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 int 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.         if(i+repeat > 256) {

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

  227.             return -1;

  228.         }

  229.         while (repeat--)

  230.             dst[i++] = val;

  231.     }

  232.     return 0;

  233. }

  234. 

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

  236.     int len, index;

  237.     uint32_t bits=0;

  238. 

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

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

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

  242.                 dst[index]= bits++;

  243.         }

  244.         if(bits & 1){

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

  246.             return -1;

  247.         }

  248.         bits >>= 1;

  249.     }

  250.     return 0;

  251. }

  252. 

  253. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  254. typedef struct {

  255.     uint64_t val;

  256.     int name;

  257. } HeapElem;

  258. 

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

  260. {

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

  262.         int child = root*2+1;

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

  264.             child++;

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

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

  267.             root = child;

  268.         } else

  269.             break;

  270.     }

  271. }

  272. 

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

  274.     HeapElem h[size];

  275.     int up[2*size];

  276.     int len[2*size];

  277.     int offset, i, next;

  278. 

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

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

  281.             h[i].name = i;

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

  283.         }

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

  285.             heap_sift(h, i, size);

  286. 

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

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

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

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

  291.             h[0].val = INT64_MAX;

  292.             heap_sift(h, 0, size);

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

  294.             h[0].name = next;

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

  296.             heap_sift(h, 0, size);

  297.         }

  298. 

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

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

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

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

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

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

  305.         }

  306.         if(i==size) break;

  307.     }

  308. }

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

  310. 

  311. static void generate_joint_tables(HYuvContext *s){

  312.     uint16_t symbols[1<<VLC_BITS];

  313.     uint16_t bits[1<<VLC_BITS];

  314.     uint8_t len[1<<VLC_BITS];

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

  316.         int p, i, y, u;

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

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

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

  320.                 int limit = VLC_BITS - len0;

  321.                 if(limit <= 0)

  322.                     continue;

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

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

  325.                     if(len1 > limit)

  326.                         continue;

  327.                     len[i] = len0 + len1;

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

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

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

  331.                         i++;

  332.                 }

  333.             }

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

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

  336.         }

  337.     }else{

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

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

  340.         int p0 = s->decorrelate;

  341.         int p1 = !s->decorrelate;

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

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

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

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

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

  347.             int limit0 = VLC_BITS - len0;

  348.             if(limit0 < 2)

  349.                 continue;

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

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

  352.                 int limit1 = limit0 - len1;

  353.                 if(limit1 < 1)

  354.                     continue;

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

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

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

  358.                     if(len2 > limit1)

  359.                         continue;

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

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

  362.                     if(s->decorrelate){

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

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

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

  366.                     }else{

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

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

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

  370.                     }

  371.                     i++;

  372.                 }

  373.             }

  374.         }

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

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

  377.     }

  378. }

  379. 

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

  381.     GetBitContext gb;

  382.     int i;

  383. 

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

  385. 

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

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

  388.             return -1;

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

  390.             return -1;

  391.         }

  392. #if 0

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

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

  395. }

  396. #endif

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

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

  399.     }

  400. 

  401.     generate_joint_tables(s);

  402. 

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

  404. }

  405. 

  406. static int read_old_huffman_tables(HYuvContext *s){

  407. #if 1

  408.     GetBitContext gb;

  409.     int i;

  410. 

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

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

  413.         return -1;

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

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

  416.         return -1;

  417. 

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

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

  420. 

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

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

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

  424.     }

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

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

  427. 

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

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

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

  431.     }

  432. 

  433.     generate_joint_tables(s);

  434. 

  435.     return 0;

  436. #else

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

  438.     return -1;

  439. #endif

  440. }

  441. 

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

  443.     int i;

  444. 

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

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

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

  448.         }

  449.     }else{

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

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

  452.         }

  453.     }

  454. }

  455. 

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

  457.     HYuvContext *s = avctx->priv_data;

  458. 

  459.     s->avctx= avctx;

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

  461. 

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

  463. 

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

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

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

  467. 

  468.     return 0;

  469. }

  470. 

  471. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

  472. static av_cold int decode_init(AVCodecContext *avctx)

  473. {

  474.     HYuvContext *s = avctx->priv_data;

  475. 

  476.     common_init(avctx);

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

  478. 

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

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

  481. 

  482. s->bgr32=1;

  483. //if(avctx->extradata)

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

  485.     if(avctx->extradata_size){

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

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

  488.         else

  489.             s->version=2;

  490.     }else

  491.         s->version=0;

  492. 

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

  494.         int method, interlace;

  495. 

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

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

  498.         s->predictor= method&63;

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

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

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

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

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

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

  505. 

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

  507.             return -1;

  508.     }else{

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

  510.         case 1:

  511.             s->predictor= LEFT;

  512.             s->decorrelate= 0;

  513.             break;

  514.         case 2:

  515.             s->predictor= LEFT;

  516.             s->decorrelate= 1;

  517.             break;

  518.         case 3:

  519.             s->predictor= PLANE;

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

  521.             break;

  522.         case 4:

  523.             s->predictor= MEDIAN;

  524.             s->decorrelate= 0;

  525.             break;

  526.         default:

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

  528.             s->decorrelate= 0;

  529.             break;

  530.         }

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

  532.         s->context= 0;

  533. 

  534.         if(read_old_huffman_tables(s) < 0)

  535.             return -1;

  536.     }

  537. 

  538.     switch(s->bitstream_bpp){

  539.     case 12:

  540.         avctx->pix_fmt = PIX_FMT_YUV420P;

  541.         break;

  542.     case 16:

  543.         if(s->yuy2){

  544.             avctx->pix_fmt = PIX_FMT_YUYV422;

  545.         }else{

  546.             avctx->pix_fmt = PIX_FMT_YUV422P;

  547.         }

  548.         break;

  549.     case 24:

  550.     case 32:

  551.         if(s->bgr32){

  552.             avctx->pix_fmt = PIX_FMT_RGB32;

  553.         }else{

  554.             avctx->pix_fmt = PIX_FMT_BGR24;

  555.         }

  556.         break;

  557.     default:

  558.         assert(0);

  559.     }

  560. 

  561.     alloc_temp(s);

  562. 

  563. //    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);

  564. 

  565.     return 0;

  566. }

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

  568. 

  569. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

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

  571.     int i;

  572.     int index= 0;

  573. 

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

  575.         int val= len[i];

  576.         int repeat=0;

  577. 

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

  579.             repeat++;

  580. 

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

  582.         if(repeat>7){

  583.             buf[index++]= val;

  584.             buf[index++]= repeat;

  585.         }else{

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

  587.         }

  588.     }

  589. 

  590.     return index;

  591. }

  592. 

  593. static av_cold int encode_init(AVCodecContext *avctx)

  594. {

  595.     HYuvContext *s = avctx->priv_data;

  596.     int i, j;

  597. 

  598.     common_init(avctx);

  599. 

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

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

  602.     s->version=2;

  603. 

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

  605. 

  606.     switch(avctx->pix_fmt){

  607.     case PIX_FMT_YUV420P:

  608.         s->bitstream_bpp= 12;

  609.         break;

  610.     case PIX_FMT_YUV422P:

  611.         s->bitstream_bpp= 16;

  612.         break;

  613.     case PIX_FMT_RGB32:

  614.         s->bitstream_bpp= 24;

  615.         break;

  616.     default:

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

  618.         return -1;

  619.     }

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

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

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

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

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

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

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

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

  628.             return -1;

  629.         }

  630.     }else s->context= 0;

  631. 

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

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

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

  635.             return -1;

  636.         }

  637.         if(avctx->context_model){

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

  639.             return -1;

  640.         }

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

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

  643.     }

  644. 

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

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

  647.         return -1;

  648.     }

  649. 

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

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

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

  653.     if(s->context)

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

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

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

  657. 

  658.     if(avctx->stats_in){

  659.         char *p= avctx->stats_in;

  660. 

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

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

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

  664. 

  665.         for(;;){

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

  667.                 char *next;

  668. 

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

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

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

  672.                     p=next;

  673.                 }

  674.             }

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

  676.         }

  677.     }else{

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

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

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

  681. 

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

  683.             }

  684.     }

  685. 

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

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

  688. 

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

  690.             return -1;

  691.         }

  692. 

  693.         s->avctx->extradata_size+=

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

  695.     }

  696. 

  697.     if(s->context){

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

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

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

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

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

  703.             }

  704.         }

  705.     }else{

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

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

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

  709.     }

  710. 

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

  712. 

  713.     alloc_temp(s);

  714. 

  715.     s->picture_number=0;

  716. 

  717.     return 0;

  718. }

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

  720. 

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

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

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

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

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

  726.         dst0 = code>>8;\

  727.         dst1 = code;\

  728.     }else{\

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

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

  731.     }\

  732. }

  733. 

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

  735.     int i;

  736. 

  737.     count/=2;

  738. 

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

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

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

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

  743.         }

  744.     }else{

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

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

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

  748.         }

  749.     }

  750. }

  751. 

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

  753.     int i;

  754. 

  755.     count/=2;

  756. 

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

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

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

  760.         }

  761.     }else{

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

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

  764.         }

  765.     }

  766. }

  767. 

  768. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

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

  770.     int i;

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

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

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

  774. 

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

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

  777.         return -1;

  778.     }

  779. 

  780. #define LOAD4\

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

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

  783.             int u0 = u[i];\

  784.             int v0 = v[i];

  785. 

  786.     count/=2;

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

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

  789.             LOAD4;

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

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

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

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

  794.         }

  795.     }

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

  797.         return 0;

  798.     if(s->context){

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

  800.             LOAD4;

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

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

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

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

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

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

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

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

  809.         }

  810.     }else{

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

  812.             LOAD4;

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

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

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

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

  817.         }

  818.     }

  819.     return 0;

  820. }

  821. 

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

  823.     int i;

  824. 

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

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

  827.         return -1;

  828.     }

  829. 

  830. #define LOAD2\

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

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

  833. #define STAT2\

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

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

  836. #define WRITE2\

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

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

  839. 

  840.     count/=2;

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

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

  843.             LOAD2;

  844.             STAT2;

  845.         }

  846.     }

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

  848.         return 0;

  849. 

  850.     if(s->context){

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

  852.             LOAD2;

  853.             STAT2;

  854.             WRITE2;

  855.         }

  856.     }else{

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

  858.             LOAD2;

  859.             WRITE2;

  860.         }

  861.     }

  862.     return 0;

  863. }

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

  865. 

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

  867.     int i;

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

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

  870.         if(code != -1){

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

  872.         }else if(decorrelate){

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

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

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

  876.         }else{

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

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

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

  880.         }

  881.         if(alpha)

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

  883.     }

  884. }

  885. 

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

  887.     if(s->decorrelate){

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

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

  890.         else

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

  892.     }else{

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

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

  895.         else

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

  897.     }

  898. }

  899. 

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

  901.     int i;

  902. 

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

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

  905.         return -1;

  906.     }

  907. 

  908. #define LOAD3\

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

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

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

  912. #define STAT3\

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

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

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

  916. #define WRITE3\

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

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

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

  920. 

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

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

  923.             LOAD3;

  924.             STAT3;

  925.         }

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

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

  928.             LOAD3;

  929.             STAT3;

  930.             WRITE3;

  931.         }

  932.     }else{

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

  934.             LOAD3;

  935.             WRITE3;

  936.         }

  937.     }

  938.     return 0;

  939. }

  940. 

  941. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

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

  943.     int h, cy;

  944.     int offset[4];

  945. 

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

  947.         return;

  948. 

  949.     h= y - s->last_slice_end;

  950.     y -= h;

  951. 

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

  953.         cy= y>>1;

  954.     }else{

  955.         cy= y;

  956.     }

  957. 

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

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

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

  961.     offset[3] = 0;

  962.     emms_c();

  963. 

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

  965. 

  966.     s->last_slice_end= y + h;

  967. }

  968. 

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

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

  971.     int buf_size = avpkt->size;

  972.     HYuvContext *s = avctx->priv_data;

  973.     const int width= s->width;

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

  975.     const int height= s->height;

  976.     int fake_ystride, fake_ustride, fake_vstride;

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

  978.     int table_size= 0;

  979. 

  980.     AVFrame *picture = data;

  981. 

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

  983.     if (!s->bitstream_buffer)

  984.         return AVERROR(ENOMEM);

  985. 

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

  987. 

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

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

  990. 

  991.     p->reference= 0;

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

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

  994.         return -1;

  995.     }

  996. 

  997.     if(s->context){

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

  999.         if(table_size < 0)

  1000.             return -1;

  1001.     }

  1002. 

  1003.     if((unsigned)(buf_size-table_size) >= INT_MAX/8)

  1004.         return -1;

  1005. 

  1006.     init_get_bits(&s->gb, s->bitstream_buffer+table_size, (buf_size-table_size)*8);

  1007. 

  1008.     fake_ystride= s->interlaced ? p->linesize[0]*2  : p->linesize[0];

  1009.     fake_ustride= s->interlaced ? p->linesize[1]*2  : p->linesize[1];

  1010.     fake_vstride= s->interlaced ? p->linesize[2]*2  : p->linesize[2];

  1011. 

  1012.     s->last_slice_end= 0;

  1013. 

  1014.     if(s->bitstream_bpp<24){

  1015.         int y, cy;

  1016.         int lefty, leftu, leftv;

  1017.         int lefttopy, lefttopu, lefttopv;

  1018. 

  1019.         if(s->yuy2){

  1020.             p->data[0][3]= get_bits(&s->gb, 8);

  1021.             p->data[0][2]= get_bits(&s->gb, 8);

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

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

  1024. 

  1025.             av_log(avctx, AV_LOG_ERROR, "YUY2 output is not implemented yet\n");

  1026.             return -1;

  1027.         }else{

  1028. 

  1029.             leftv= p->data[2][0]= get_bits(&s->gb, 8);

  1030.             lefty= p->data[0][1]= get_bits(&s->gb, 8);

  1031.             leftu= p->data[1][0]= get_bits(&s->gb, 8);

  1032.                    p->data[0][0]= get_bits(&s->gb, 8);

  1033. 

  1034.             switch(s->predictor){

  1035.             case LEFT:

  1036.             case PLANE:

  1037.                 decode_422_bitstream(s, width-2);

  1038.                 lefty= add_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);

  1039.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1040.                     leftu= add_left_prediction(p->data[1] + 1, s->temp[1], width2-1, leftu);

  1041.                     leftv= add_left_prediction(p->data[2] + 1, s->temp[2], width2-1, leftv);

  1042.                 }

  1043. 

  1044.                 for(cy=y=1; y<s->height; y++,cy++){

  1045.                     uint8_t *ydst, *udst, *vdst;

  1046. 

  1047.                     if(s->bitstream_bpp==12){

  1048.                         decode_gray_bitstream(s, width);

  1049. 

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

  1051. 

  1052.                         lefty= add_left_prediction(ydst, s->temp[0], width, lefty);

  1053.                         if(s->predictor == PLANE){

  1054.                             if(y>s->interlaced)

  1055.                                 s->dsp.add_bytes(ydst, ydst - fake_ystride, width);

  1056.                         }

  1057.                         y++;

  1058.                         if(y>=s->height) break;

  1059.                     }

  1060. 

  1061.                     draw_slice(s, y);

  1062. 

  1063.                     ydst= p->data[0] + p->linesize[0]*y;

  1064.                     udst= p->data[1] + p->linesize[1]*cy;

  1065.                     vdst= p->data[2] + p->linesize[2]*cy;

  1066. 

  1067.                     decode_422_bitstream(s, width);

  1068.                     lefty= add_left_prediction(ydst, s->temp[0], width, lefty);

  1069.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1070.                         leftu= add_left_prediction(udst, s->temp[1], width2, leftu);

  1071.                         leftv= add_left_prediction(vdst, s->temp[2], width2, leftv);

  1072.                     }

  1073.                     if(s->predictor == PLANE){

  1074.                         if(cy>s->interlaced){

  1075.                             s->dsp.add_bytes(ydst, ydst - fake_ystride, width);

  1076.                             if(!(s->flags&CODEC_FLAG_GRAY)){

  1077.                                 s->dsp.add_bytes(udst, udst - fake_ustride, width2);

  1078.                                 s->dsp.add_bytes(vdst, vdst - fake_vstride, width2);

  1079.                             }

  1080.                         }

  1081.                     }

  1082.                 }

  1083.                 draw_slice(s, height);

  1084. 

  1085.                 break;

  1086.             case MEDIAN:

  1087.                 /* first line except first 2 pixels is left predicted */

  1088.                 decode_422_bitstream(s, width-2);

  1089.                 lefty= add_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);

  1090.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1091.                     leftu= add_left_prediction(p->data[1] + 1, s->temp[1], width2-1, leftu);

  1092.                     leftv= add_left_prediction(p->data[2] + 1, s->temp[2], width2-1, leftv);

  1093.                 }

  1094. 

  1095.                 cy=y=1;

  1096. 

  1097.                 /* second line is left predicted for interlaced case */

  1098.                 if(s->interlaced){

  1099.                     decode_422_bitstream(s, width);

  1100.                     lefty= add_left_prediction(p->data[0] + p->linesize[0], s->temp[0], width, lefty);

  1101.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1102.                         leftu= add_left_prediction(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);

  1103.                         leftv= add_left_prediction(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);

  1104.                     }

  1105.                     y++; cy++;

  1106.                 }

  1107. 

  1108.                 /* next 4 pixels are left predicted too */

  1109.                 decode_422_bitstream(s, 4);

  1110.                 lefty= add_left_prediction(p->data[0] + fake_ystride, s->temp[0], 4, lefty);

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

  1112.                     leftu= add_left_prediction(p->data[1] + fake_ustride, s->temp[1], 2, leftu);

  1113.                     leftv= add_left_prediction(p->data[2] + fake_vstride, s->temp[2], 2, leftv);

  1114.                 }

  1115. 

  1116.                 /* next line except the first 4 pixels is median predicted */

  1117.                 lefttopy= p->data[0][3];

  1118.                 decode_422_bitstream(s, width-4);

  1119.                 s->dsp.add_hfyu_median_prediction(p->data[0] + fake_ystride+4, p->data[0]+4, s->temp[0], width-4, &lefty, &lefttopy);

  1120.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1121.                     lefttopu= p->data[1][1];

  1122.                     lefttopv= p->data[2][1];

  1123.                     s->dsp.add_hfyu_median_prediction(p->data[1] + fake_ustride+2, p->data[1]+2, s->temp[1], width2-2, &leftu, &lefttopu);

  1124.                     s->dsp.add_hfyu_median_prediction(p->data[2] + fake_vstride+2, p->data[2]+2, s->temp[2], width2-2, &leftv, &lefttopv);

  1125.                 }

  1126.                 y++; cy++;

  1127. 

  1128.                 for(; y<height; y++,cy++){

  1129.                     uint8_t *ydst, *udst, *vdst;

  1130. 

  1131.                     if(s->bitstream_bpp==12){

  1132.                         while(2*cy > y){

  1133.                             decode_gray_bitstream(s, width);

  1134.                             ydst= p->data[0] + p->linesize[0]*y;

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

  1136.                             y++;

  1137.                         }

  1138.                         if(y>=height) break;

  1139.                     }

  1140.                     draw_slice(s, y);

  1141. 

  1142.                     decode_422_bitstream(s, width);

  1143. 

  1144.                     ydst= p->data[0] + p->linesize[0]*y;

  1145.                     udst= p->data[1] + p->linesize[1]*cy;

  1146.                     vdst= p->data[2] + p->linesize[2]*cy;

  1147. 

  1148.                     s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);

  1149.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1150.                         s->dsp.add_hfyu_median_prediction(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);

  1151.                         s->dsp.add_hfyu_median_prediction(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);

  1152.                     }

  1153.                 }

  1154. 

  1155.                 draw_slice(s, height);

  1156.                 break;

  1157.             }

  1158.         }

  1159.     }else{

  1160.         int y;

  1161.         int leftr, leftg, leftb;

  1162.         const int last_line= (height-1)*p->linesize[0];

  1163. 

  1164.         if(s->bitstream_bpp==32){

  1165.             skip_bits(&s->gb, 8);

  1166.             leftr= p->data[0][last_line+R]= get_bits(&s->gb, 8);

  1167.             leftg= p->data[0][last_line+G]= get_bits(&s->gb, 8);

  1168.             leftb= p->data[0][last_line+B]= get_bits(&s->gb, 8);

  1169.         }else{

  1170.             leftr= p->data[0][last_line+R]= get_bits(&s->gb, 8);

  1171.             leftg= p->data[0][last_line+G]= get_bits(&s->gb, 8);

  1172.             leftb= p->data[0][last_line+B]= get_bits(&s->gb, 8);

  1173.             skip_bits(&s->gb, 8);

  1174.         }

  1175. 

  1176.         if(s->bgr32){

  1177.             switch(s->predictor){

  1178.             case LEFT:

  1179.             case PLANE:

  1180.                 decode_bgr_bitstream(s, width-1);

  1181.                 add_left_prediction_bgr32(p->data[0] + last_line+4, s->temp[0], width-1, &leftr, &leftg, &leftb);

  1182. 

  1183.                 for(y=s->height-2; y>=0; y--){ //Yes it is stored upside down.

  1184.                     decode_bgr_bitstream(s, width);

  1185. 

  1186.                     add_left_prediction_bgr32(p->data[0] + p->linesize[0]*y, s->temp[0], width, &leftr, &leftg, &leftb);

  1187.                     if(s->predictor == PLANE){

  1188.                         if((y&s->interlaced)==0 && y<s->height-1-s->interlaced){

  1189.                             s->dsp.add_bytes(p->data[0] + p->linesize[0]*y,

  1190.                                              p->data[0] + p->linesize[0]*y + fake_ystride, fake_ystride);

  1191.                         }

  1192.                     }

  1193.                 }

  1194.                 draw_slice(s, height); // just 1 large slice as this is not possible in reverse order

  1195.                 break;

  1196.             default:

  1197.                 av_log(avctx, AV_LOG_ERROR, "prediction type not supported!\n");

  1198.             }

  1199.         }else{

  1200. 

  1201.             av_log(avctx, AV_LOG_ERROR, "BGR24 output is not implemented yet\n");

  1202.             return -1;

  1203.         }

  1204.     }

  1205.     emms_c();

  1206. 

  1207.     *picture= *p;

  1208.     *data_size = sizeof(AVFrame);

  1209. 

  1210.     return (get_bits_count(&s->gb)+31)/32*4 + table_size;

  1211. }

  1212. #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */

  1213. 

  1214. static int common_end(HYuvContext *s){

  1215.     int i;

  1216. 

  1217.     for(i=0; i<3; i++){

  1218.         av_freep(&s->temp[i]);

  1219.     }

  1220.     return 0;

  1221. }

  1222. 

  1223. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

  1224. static av_cold int decode_end(AVCodecContext *avctx)

  1225. {

  1226.     HYuvContext *s = avctx->priv_data;

  1227.     int i;

  1228. 

  1229.     common_end(s);

  1230.     av_freep(&s->bitstream_buffer);

  1231. 

  1232.     for(i=0; i<6; i++){

  1233.         free_vlc(&s->vlc[i]);

  1234.     }

  1235. 

  1236.     return 0;

  1237. }

  1238. #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */

  1239. 

  1240. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  1241. static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

  1242.     HYuvContext *s = avctx->priv_data;

  1243.     AVFrame *pict = data;

  1244.     const int width= s->width;

  1245.     const int width2= s->width>>1;

  1246.     const int height= s->height;

  1247.     const int fake_ystride= s->interlaced ? pict->linesize[0]*2  : pict->linesize[0];

  1248.     const int fake_ustride= s->interlaced ? pict->linesize[1]*2  : pict->linesize[1];

  1249.     const int fake_vstride= s->interlaced ? pict->linesize[2]*2  : pict->linesize[2];

  1250.     AVFrame * const p= &s->picture;

  1251.     int i, j, size=0;

  1252. 

  1253.     *p = *pict;

  1254.     p->pict_type= FF_I_TYPE;

  1255.     p->key_frame= 1;

  1256. 

  1257.     if(s->context){

  1258.         for(i=0; i<3; i++){

  1259.             generate_len_table(s->len[i], s->stats[i], 256);

  1260.             if(generate_bits_table(s->bits[i], s->len[i])<0)

  1261.                 return -1;

  1262.             size+= store_table(s, s->len[i], &buf[size]);

  1263.         }

  1264. 

  1265.         for(i=0; i<3; i++)

  1266.             for(j=0; j<256; j++)

  1267.                 s->stats[i][j] >>= 1;

  1268.     }

  1269. 

  1270.     init_put_bits(&s->pb, buf+size, buf_size-size);

  1271. 

  1272.     if(avctx->pix_fmt == PIX_FMT_YUV422P || avctx->pix_fmt == PIX_FMT_YUV420P){

  1273.         int lefty, leftu, leftv, y, cy;

  1274. 

  1275.         put_bits(&s->pb, 8, leftv= p->data[2][0]);

  1276.         put_bits(&s->pb, 8, lefty= p->data[0][1]);

  1277.         put_bits(&s->pb, 8, leftu= p->data[1][0]);

  1278.         put_bits(&s->pb, 8,        p->data[0][0]);

  1279. 

  1280.         lefty= sub_left_prediction(s, s->temp[0], p->data[0], width , 0);

  1281.         leftu= sub_left_prediction(s, s->temp[1], p->data[1], width2, 0);

  1282.         leftv= sub_left_prediction(s, s->temp[2], p->data[2], width2, 0);

  1283. 

  1284.         encode_422_bitstream(s, 2, width-2);

  1285. 

  1286.         if(s->predictor==MEDIAN){

  1287.             int lefttopy, lefttopu, lefttopv;

  1288.             cy=y=1;

  1289.             if(s->interlaced){

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

  1291.                 leftu= sub_left_prediction(s, s->temp[1], p->data[1]+p->linesize[1], width2, leftu);

  1292.                 leftv= sub_left_prediction(s, s->temp[2], p->data[2]+p->linesize[2], width2, leftv);

  1293. 

  1294.                 encode_422_bitstream(s, 0, width);

  1295.                 y++; cy++;

  1296.             }

  1297. 

  1298.             lefty= sub_left_prediction(s, s->temp[0], p->data[0]+fake_ystride, 4, lefty);

  1299.             leftu= sub_left_prediction(s, s->temp[1], p->data[1]+fake_ustride, 2, leftu);

  1300.             leftv= sub_left_prediction(s, s->temp[2], p->data[2]+fake_vstride, 2, leftv);

  1301. 

  1302.             encode_422_bitstream(s, 0, 4);

  1303. 

  1304.             lefttopy= p->data[0][3];

  1305.             lefttopu= p->data[1][1];

  1306.             lefttopv= p->data[2][1];

  1307.             s->dsp.sub_hfyu_median_prediction(s->temp[0], p->data[0]+4, p->data[0] + fake_ystride+4, width-4 , &lefty, &lefttopy);

  1308.             s->dsp.sub_hfyu_median_prediction(s->temp[1], p->data[1]+2, p->data[1] + fake_ustride+2, width2-2, &leftu, &lefttopu);

  1309.             s->dsp.sub_hfyu_median_prediction(s->temp[2], p->data[2]+2, p->data[2] + fake_vstride+2, width2-2, &leftv, &lefttopv);

  1310.             encode_422_bitstream(s, 0, width-4);

  1311.             y++; cy++;

  1312. 

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

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

  1315. 

  1316.                 if(s->bitstream_bpp==12){

  1317.                     while(2*cy > y){

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

  1319.                         s->dsp.sub_hfyu_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);

  1320.                         encode_gray_bitstream(s, width);

  1321.                         y++;

  1322.                     }

  1323.                     if(y>=height) break;

  1324.                 }

  1325.                 ydst= p->data[0] + p->linesize[0]*y;

  1326.                 udst= p->data[1] + p->linesize[1]*cy;

  1327.                 vdst= p->data[2] + p->linesize[2]*cy;

  1328. 

  1329.                 s->dsp.sub_hfyu_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);

  1330.                 s->dsp.sub_hfyu_median_prediction(s->temp[1], udst - fake_ustride, udst, width2, &leftu, &lefttopu);

  1331.                 s->dsp.sub_hfyu_median_prediction(s->temp[2], vdst - fake_vstride, vdst, width2, &leftv, &lefttopv);

  1332. 

  1333.                 encode_422_bitstream(s, 0, width);

  1334.             }

  1335.         }else{

  1336.             for(cy=y=1; y<height; y++,cy++){

  1337.                 uint8_t *ydst, *udst, *vdst;

  1338. 

  1339.                 /* encode a luma only line & y++ */

  1340.                 if(s->bitstream_bpp==12){

  1341.                     ydst= p->data[0] + p->linesize[0]*y;

  1342. 

  1343.                     if(s->predictor == PLANE && s->interlaced < y){

  1344.                         s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);

  1345. 

  1346.                         lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);

  1347.                     }else{

  1348.                         lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);

  1349.                     }

  1350.                     encode_gray_bitstream(s, width);

  1351.                     y++;

  1352.                     if(y>=height) break;

  1353.                 }

  1354. 

  1355.                 ydst= p->data[0] + p->linesize[0]*y;

  1356.                 udst= p->data[1] + p->linesize[1]*cy;

  1357.                 vdst= p->data[2] + p->linesize[2]*cy;

  1358. 

  1359.                 if(s->predictor == PLANE && s->interlaced < cy){

  1360.                     s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);

  1361.                     s->dsp.diff_bytes(s->temp[2], udst, udst - fake_ustride, width2);

  1362.                     s->dsp.diff_bytes(s->temp[2] + width2, vdst, vdst - fake_vstride, width2);

  1363. 

  1364.                     lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);

  1365.                     leftu= sub_left_prediction(s, s->temp[1], s->temp[2], width2, leftu);

  1366.                     leftv= sub_left_prediction(s, s->temp[2], s->temp[2] + width2, width2, leftv);

  1367.                 }else{

  1368.                     lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);

  1369.                     leftu= sub_left_prediction(s, s->temp[1], udst, width2, leftu);

  1370.                     leftv= sub_left_prediction(s, s->temp[2], vdst, width2, leftv);

  1371.                 }

  1372. 

  1373.                 encode_422_bitstream(s, 0, width);

  1374.             }

  1375.         }

  1376.     }else if(avctx->pix_fmt == PIX_FMT_RGB32){

  1377.         uint8_t *data = p->data[0] + (height-1)*p->linesize[0];

  1378.         const int stride = -p->linesize[0];

  1379.         const int fake_stride = -fake_ystride;

  1380.         int y;

  1381.         int leftr, leftg, leftb;

  1382. 

  1383.         put_bits(&s->pb, 8, leftr= data[R]);

  1384.         put_bits(&s->pb, 8, leftg= data[G]);

  1385.         put_bits(&s->pb, 8, leftb= data[B]);

  1386.         put_bits(&s->pb, 8, 0);

  1387. 

  1388.         sub_left_prediction_bgr32(s, s->temp[0], data+4, width-1, &leftr, &leftg, &leftb);

  1389.         encode_bgr_bitstream(s, width-1);

  1390. 

  1391.         for(y=1; y<s->height; y++){

  1392.             uint8_t *dst = data + y*stride;

  1393.             if(s->predictor == PLANE && s->interlaced < y){

  1394.                 s->dsp.diff_bytes(s->temp[1], dst, dst - fake_stride, width*4);

  1395.                 sub_left_prediction_bgr32(s, s->temp[0], s->temp[1], width, &leftr, &leftg, &leftb);

  1396.             }else{

  1397.                 sub_left_prediction_bgr32(s, s->temp[0], dst, width, &leftr, &leftg, &leftb);

  1398.             }

  1399.             encode_bgr_bitstream(s, width);

  1400.         }

  1401.     }else{

  1402.         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");

  1403.     }

  1404.     emms_c();

  1405. 

  1406.     size+= (put_bits_count(&s->pb)+31)/8;

  1407.     put_bits(&s->pb, 16, 0);

  1408.     put_bits(&s->pb, 15, 0);

  1409.     size/= 4;

  1410. 

  1411.     if((s->flags&CODEC_FLAG_PASS1) && (s->picture_number&31)==0){

  1412.         int j;

  1413.         char *p= avctx->stats_out;

  1414.         char *end= p + 1024*30;

  1415.         for(i=0; i<3; i++){

  1416.             for(j=0; j<256; j++){

  1417.                 snprintf(p, end-p, "%"PRIu64" ", s->stats[i][j]);

  1418.                 p+= strlen(p);

  1419.                 s->stats[i][j]= 0;

  1420.             }

  1421.             snprintf(p, end-p, "\n");

  1422.             p++;

  1423.         }

  1424.     } else

  1425.         avctx->stats_out[0] = '\0';

  1426.     if(!(s->avctx->flags2 & CODEC_FLAG2_NO_OUTPUT)){

  1427.         flush_put_bits(&s->pb);

  1428.         s->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, size);

  1429.     }

  1430. 

  1431.     s->picture_number++;

  1432. 

  1433.     return size*4;

  1434. }

  1435. 

  1436. static av_cold int encode_end(AVCodecContext *avctx)

  1437. {

  1438.     HYuvContext *s = avctx->priv_data;

  1439. 

  1440.     common_end(s);

  1441. 

  1442.     av_freep(&avctx->extradata);

  1443.     av_freep(&avctx->stats_out);

  1444. 

  1445.     return 0;

  1446. }

  1447. #endif /* CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER */

  1448. 

  1449. #if CONFIG_HUFFYUV_DECODER

  1450. AVCodec huffyuv_decoder = {

  1451.     "huffyuv",

  1452.     CODEC_TYPE_VIDEO,

  1453.     CODEC_ID_HUFFYUV,

  1454.     sizeof(HYuvContext),

  1455.     decode_init,

  1456.     NULL,

  1457.     decode_end,

  1458.     decode_frame,

  1459.     CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,

  1460.     NULL,

  1461.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1462. };

  1463. #endif

  1464. 

  1465. #if CONFIG_FFVHUFF_DECODER

  1466. AVCodec ffvhuff_decoder = {

  1467.     "ffvhuff",

  1468.     CODEC_TYPE_VIDEO,

  1469.     CODEC_ID_FFVHUFF,

  1470.     sizeof(HYuvContext),

  1471.     decode_init,

  1472.     NULL,

  1473.     decode_end,

  1474.     decode_frame,

  1475.     CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,

  1476.     NULL,

  1477.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1478. };

  1479. #endif

  1480. 

  1481. #if CONFIG_HUFFYUV_ENCODER

  1482. AVCodec huffyuv_encoder = {

  1483.     "huffyuv",

  1484.     CODEC_TYPE_VIDEO,

  1485.     CODEC_ID_HUFFYUV,

  1486.     sizeof(HYuvContext),

  1487.     encode_init,

  1488.     encode_frame,

  1489.     encode_end,

  1490.     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},

  1491.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1492. };

  1493. #endif

  1494. 

  1495. #if CONFIG_FFVHUFF_ENCODER

  1496. AVCodec ffvhuff_encoder = {

  1497.     "ffvhuff",

  1498.     CODEC_TYPE_VIDEO,

  1499.     CODEC_ID_FFVHUFF,

  1500.     sizeof(HYuvContext),

  1501.     encode_init,

  1502.     encode_frame,

  1503.     encode_end,

  1504.     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},

  1505.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1506. };

  1507. #endif