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FFmpeg/libavcodec/huffyuv.c

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  1. /*

  2.  * huffyuv codec for libavcodec

  3.  *

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

  5.  *

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

  7.  * the algorithm used

  8.  *

  9.  * This file is part of FFmpeg.

  10.  *

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

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

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

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

  15.  *

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

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

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

  19.  * Lesser General Public License for more details.

  20.  *

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

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

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

  24.  */

  25. 

  26. /**

  27.  * @file libavcodec/huffyuv.c

  28.  * huffyuv codec for libavcodec.

  29.  */

  30. 

  31. #include "avcodec.h"

  32. #include "bitstream.h"

  33. #include "dsputil.h"

  34. 

  35. #define VLC_BITS 11

  36. 

  37. #ifdef WORDS_BIGENDIAN

  38. #define B 3

  39. #define G 2

  40. #define R 1

  41. #else

  42. #define B 0

  43. #define G 1

  44. #define R 2

  45. #endif

  46. 

  47. typedef enum Predictor{

  48.     LEFT= 0,

  49.     PLANE,

  50.     MEDIAN,

  51. } Predictor;

  52. 

  53. typedef struct HYuvContext{

  54.     AVCodecContext *avctx;

  55.     Predictor predictor;

  56.     GetBitContext gb;

  57.     PutBitContext pb;

  58.     int interlaced;

  59.     int decorrelate;

  60.     int bitstream_bpp;

  61.     int version;

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

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

  64.     int width, height;

  65.     int flags;

  66.     int context;

  67.     int picture_number;

  68.     int last_slice_end;

  69.     uint8_t *temp[3];

  70.     uint64_t stats[3][256];

  71.     uint8_t len[3][256];

  72.     uint32_t bits[3][256];

  73.     uint32_t pix_bgr_map[1<<VLC_BITS];

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

  75.     AVFrame picture;

  76.     uint8_t *bitstream_buffer;

  77.     unsigned int bitstream_buffer_size;

  78.     DSPContext dsp;

  79. }HYuvContext;

  80. 

  81. static const unsigned char classic_shift_luma[] = {

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

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

  84.   69,68, 0

  85. };

  86. 

  87. static const unsigned char classic_shift_chroma[] = {

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

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

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

  91. };

  92. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  110. };

  111. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  129. };

  130. 

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

  132.     int i;

  133. 

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

  135.         acc+= src[i];

  136.         dst[i]= acc;

  137.         i++;

  138.         acc+= src[i];

  139.         dst[i]= acc;

  140.     }

  141. 

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

  143.         acc+= src[i];

  144.         dst[i]= acc;

  145.     }

  146. 

  147.     return acc;

  148. }

  149. 

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

  151.     int i;

  152.     int r,g,b;

  153.     r= *red;

  154.     g= *green;

  155.     b= *blue;

  156. 

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

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

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

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

  161. 

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

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

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

  165.     }

  166. 

  167.     *red= r;

  168.     *green= g;

  169.     *blue= b;

  170. }

  171. 

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

  173.     int i;

  174.     if(w<32){

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

  176.             const int temp= src[i];

  177.             dst[i]= temp - left;

  178.             left= temp;

  179.         }

  180.         return left;

  181.     }else{

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

  183.             const int temp= src[i];

  184.             dst[i]= temp - left;

  185.             left= temp;

  186.         }

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

  188.         return src[w-1];

  189.     }

  190. }

  191. 

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

  193.     int i;

  194.     int r,g,b;

  195.     r= *red;

  196.     g= *green;

  197.     b= *blue;

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

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

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

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

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

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

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

  205.         r = rt;

  206.         g = gt;

  207.         b = bt;

  208.     }

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

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

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

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

  213. }

  214. 

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

  216.     int i, val, repeat;

  217. 

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

  219.         repeat= get_bits(gb, 3);

  220.         val   = get_bits(gb, 5);

  221.         if(repeat==0)

  222.             repeat= get_bits(gb, 8);

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

  224.         while (repeat--)

  225.             dst[i++] = val;

  226.     }

  227. }

  228. 

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

  230.     int len, index;

  231.     uint32_t bits=0;

  232. 

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

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

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

  236.                 dst[index]= bits++;

  237.         }

  238.         if(bits & 1){

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

  240.             return -1;

  241.         }

  242.         bits >>= 1;

  243.     }

  244.     return 0;

  245. }

  246. 

  247. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  248. typedef struct {

  249.     uint64_t val;

  250.     int name;

  251. } HeapElem;

  252. 

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

  254. {

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

  256.         int child = root*2+1;

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

  258.             child++;

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

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

  261.             root = child;

  262.         } else

  263.             break;

  264.     }

  265. }

  266. 

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

  268.     HeapElem h[size];

  269.     int up[2*size];

  270.     int len[2*size];

  271.     int offset, i, next;

  272. 

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

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

  275.             h[i].name = i;

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

  277.         }

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

  279.             heap_sift(h, i, size);

  280. 

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

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

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

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

  285.             h[0].val = INT64_MAX;

  286.             heap_sift(h, 0, size);

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

  288.             h[0].name = next;

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

  290.             heap_sift(h, 0, size);

  291.         }

  292. 

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

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

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

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

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

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

  299.         }

  300.         if(i==size) break;

  301.     }

  302. }

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

  304. 

  305. static void generate_joint_tables(HYuvContext *s){

  306.     uint16_t symbols[1<<VLC_BITS];

  307.     uint16_t bits[1<<VLC_BITS];

  308.     uint8_t len[1<<VLC_BITS];

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

  310.         int p, i, y, u;

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

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

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

  314.                 int limit = VLC_BITS - len0;

  315.                 if(limit <= 0)

  316.                     continue;

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

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

  319.                     if(len1 > limit)

  320.                         continue;

  321.                     len[i] = len0 + len1;

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

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

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

  325.                         i++;

  326.                 }

  327.             }

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

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

  330.         }

  331.     }else{

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

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

  334.         int p0 = s->decorrelate;

  335.         int p1 = !s->decorrelate;

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

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

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

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

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

  341.             int limit0 = VLC_BITS - len0;

  342.             if(limit0 < 2)

  343.                 continue;

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

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

  346.                 int limit1 = limit0 - len1;

  347.                 if(limit1 < 1)

  348.                     continue;

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

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

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

  352.                     if(len2 > limit1)

  353.                         continue;

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

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

  356.                     if(s->decorrelate){

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

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

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

  360.                     }else{

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

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

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

  364.                     }

  365.                     i++;

  366.                 }

  367.             }

  368.         }

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

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

  371.     }

  372. }

  373. 

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

  375.     GetBitContext gb;

  376.     int i;

  377. 

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

  379. 

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

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

  382. 

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

  384.             return -1;

  385.         }

  386. #if 0

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

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

  389. }

  390. #endif

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

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

  393.     }

  394. 

  395.     generate_joint_tables(s);

  396. 

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

  398. }

  399. 

  400. static int read_old_huffman_tables(HYuvContext *s){

  401. #if 1

  402.     GetBitContext gb;

  403.     int i;

  404. 

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

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

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

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

  409. 

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

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

  412. 

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

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

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

  416.     }

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

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

  419. 

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

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

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

  423.     }

  424. 

  425.     generate_joint_tables(s);

  426. 

  427.     return 0;

  428. #else

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

  430.     return -1;

  431. #endif

  432. }

  433. 

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

  435.     int i;

  436. 

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

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

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

  440.         }

  441.     }else{

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

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

  444.         }

  445.     }

  446. }

  447. 

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

  449.     HYuvContext *s = avctx->priv_data;

  450. 

  451.     s->avctx= avctx;

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

  453. 

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

  455. 

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

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

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

  459. 

  460.     return 0;

  461. }

  462. 

  463. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

  464. static av_cold int decode_init(AVCodecContext *avctx)

  465. {

  466.     HYuvContext *s = avctx->priv_data;

  467. 

  468.     common_init(avctx);

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

  470. 

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

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

  473. 

  474. s->bgr32=1;

  475. //if(avctx->extradata)

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

  477.     if(avctx->extradata_size){

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

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

  480.         else

  481.             s->version=2;

  482.     }else

  483.         s->version=0;

  484. 

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

  486.         int method, interlace;

  487. 

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

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

  490.         s->predictor= method&63;

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

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

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

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

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

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

  497. 

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

  499.             return -1;

  500.     }else{

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

  502.         case 1:

  503.             s->predictor= LEFT;

  504.             s->decorrelate= 0;

  505.             break;

  506.         case 2:

  507.             s->predictor= LEFT;

  508.             s->decorrelate= 1;

  509.             break;

  510.         case 3:

  511.             s->predictor= PLANE;

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

  513.             break;

  514.         case 4:

  515.             s->predictor= MEDIAN;

  516.             s->decorrelate= 0;

  517.             break;

  518.         default:

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

  520.             s->decorrelate= 0;

  521.             break;

  522.         }

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

  524.         s->context= 0;

  525. 

  526.         if(read_old_huffman_tables(s) < 0)

  527.             return -1;

  528.     }

  529. 

  530.     switch(s->bitstream_bpp){

  531.     case 12:

  532.         avctx->pix_fmt = PIX_FMT_YUV420P;

  533.         break;

  534.     case 16:

  535.         if(s->yuy2){

  536.             avctx->pix_fmt = PIX_FMT_YUYV422;

  537.         }else{

  538.             avctx->pix_fmt = PIX_FMT_YUV422P;

  539.         }

  540.         break;

  541.     case 24:

  542.     case 32:

  543.         if(s->bgr32){

  544.             avctx->pix_fmt = PIX_FMT_RGB32;

  545.         }else{

  546.             avctx->pix_fmt = PIX_FMT_BGR24;

  547.         }

  548.         break;

  549.     default:

  550.         assert(0);

  551.     }

  552. 

  553.     alloc_temp(s);

  554. 

  555. //    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);

  556. 

  557.     return 0;

  558. }

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

  560. 

  561. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

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

  563.     int i;

  564.     int index= 0;

  565. 

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

  567.         int val= len[i];

  568.         int repeat=0;

  569. 

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

  571.             repeat++;

  572. 

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

  574.         if(repeat>7){

  575.             buf[index++]= val;

  576.             buf[index++]= repeat;

  577.         }else{

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

  579.         }

  580.     }

  581. 

  582.     return index;

  583. }

  584. 

  585. static av_cold int encode_init(AVCodecContext *avctx)

  586. {

  587.     HYuvContext *s = avctx->priv_data;

  588.     int i, j;

  589. 

  590.     common_init(avctx);

  591. 

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

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

  594.     s->version=2;

  595. 

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

  597. 

  598.     switch(avctx->pix_fmt){

  599.     case PIX_FMT_YUV420P:

  600.         s->bitstream_bpp= 12;

  601.         break;

  602.     case PIX_FMT_YUV422P:

  603.         s->bitstream_bpp= 16;

  604.         break;

  605.     case PIX_FMT_RGB32:

  606.         s->bitstream_bpp= 24;

  607.         break;

  608.     default:

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

  610.         return -1;

  611.     }

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

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

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

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

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

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

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

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

  620.             return -1;

  621.         }

  622.     }else s->context= 0;

  623. 

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

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

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

  627.             return -1;

  628.         }

  629.         if(avctx->context_model){

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

  631.             return -1;

  632.         }

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

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

  635.     }

  636. 

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

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

  639.         return -1;

  640.     }

  641. 

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

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

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

  645.     if(s->context)

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

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

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

  649. 

  650.     if(avctx->stats_in){

  651.         char *p= avctx->stats_in;

  652. 

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

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

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

  656. 

  657.         for(;;){

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

  659.                 char *next;

  660. 

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

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

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

  664.                     p=next;

  665.                 }

  666.             }

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

  668.         }

  669.     }else{

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

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

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

  673. 

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

  675.             }

  676.     }

  677. 

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

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

  680. 

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

  682.             return -1;

  683.         }

  684. 

  685.         s->avctx->extradata_size+=

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

  687.     }

  688. 

  689.     if(s->context){

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

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

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

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

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

  695.             }

  696.         }

  697.     }else{

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

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

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

  701.     }

  702. 

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

  704. 

  705.     alloc_temp(s);

  706. 

  707.     s->picture_number=0;

  708. 

  709.     return 0;

  710. }

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

  712. 

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

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

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

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

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

  718.         dst0 = code>>8;\

  719.         dst1 = code;\

  720.     }else{\

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

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

  723.     }\

  724. }

  725. 

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

  727.     int i;

  728. 

  729.     count/=2;

  730. 

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

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

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

  734.     }

  735. }

  736. 

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

  738.     int i;

  739. 

  740.     count/=2;

  741. 

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

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

  744.     }

  745. }

  746. 

  747. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

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

  749.     int i;

  750. 

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

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

  753.         return -1;

  754.     }

  755. 

  756. #define LOAD4\

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

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

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

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

  761. 

  762.     count/=2;

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

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

  765.             LOAD4;

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

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

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

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

  770.         }

  771.     }

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

  773.         return 0;

  774.     if(s->context){

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

  776.             LOAD4;

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

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

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

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

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

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

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

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

  785.         }

  786.     }else{

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

  788.             LOAD4;

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

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

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

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

  793.         }

  794.     }

  795.     return 0;

  796. }

  797. 

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

  799.     int i;

  800. 

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

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

  803.         return -1;

  804.     }

  805. 

  806. #define LOAD2\

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

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

  809. #define STAT2\

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

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

  812. #define WRITE2\

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

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

  815. 

  816.     count/=2;

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

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

  819.             LOAD2;

  820.             STAT2;

  821.         }

  822.     }

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

  824.         return 0;

  825. 

  826.     if(s->context){

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

  828.             LOAD2;

  829.             STAT2;

  830.             WRITE2;

  831.         }

  832.     }else{

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

  834.             LOAD2;

  835.             WRITE2;

  836.         }

  837.     }

  838.     return 0;

  839. }

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

  841. 

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

  843.     int i;

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

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

  846.         if(code != -1){

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

  848.         }else if(decorrelate){

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

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

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

  852.         }else{

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

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

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

  856.         }

  857.         if(alpha)

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

  859.     }

  860. }

  861. 

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

  863.     if(s->decorrelate){

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

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

  866.         else

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

  868.     }else{

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

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

  871.         else

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

  873.     }

  874. }

  875. 

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

  877.     int i;

  878. 

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

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

  881.         return -1;

  882.     }

  883. 

  884. #define LOAD3\

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

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

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

  888. #define STAT3\

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

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

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

  892. #define WRITE3\

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

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

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

  896. 

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

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

  899.             LOAD3;

  900.             STAT3;

  901.         }

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

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

  904.             LOAD3;

  905.             STAT3;

  906.             WRITE3;

  907.         }

  908.     }else{

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

  910.             LOAD3;

  911.             WRITE3;

  912.         }

  913.     }

  914.     return 0;

  915. }

  916. 

  917. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

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

  919.     int h, cy;

  920.     int offset[4];

  921. 

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

  923.         return;

  924. 

  925.     h= y - s->last_slice_end;

  926.     y -= h;

  927. 

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

  929.         cy= y>>1;

  930.     }else{

  931.         cy= y;

  932.     }

  933. 

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

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

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

  937.     offset[3] = 0;

  938.     emms_c();

  939. 

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

  941. 

  942.     s->last_slice_end= y + h;

  943. }

  944. 

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

  946.     HYuvContext *s = avctx->priv_data;

  947.     const int width= s->width;

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

  949.     const int height= s->height;

  950.     int fake_ystride, fake_ustride, fake_vstride;

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

  952.     int table_size= 0;

  953. 

  954.     AVFrame *picture = data;

  955. 

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

  957. 

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

  959. 

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

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

  962. 

  963.     p->reference= 0;

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

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

  966.         return -1;

  967.     }

  968. 

  969.     if(s->context){

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

  971.         if(table_size < 0)

  972.             return -1;

  973.     }

  974. 

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

  976.         return -1;

  977. 

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

  979. 

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

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

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

  983. 

  984.     s->last_slice_end= 0;

  985. 

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

  987.         int y, cy;

  988.         int lefty, leftu, leftv;

  989.         int lefttopy, lefttopu, lefttopv;

  990. 

  991.         if(s->yuy2){

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

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

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

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

  996. 

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

  998.             return -1;

  999.         }else{

  1000. 

  1001.             leftv= p->data[2][0]= get_bits(&s->gb, 8);

  1002.             lefty= p->data[0][1]= get_bits(&s->gb, 8);

  1003.             leftu= p->data[1][0]= get_bits(&s->gb, 8);

  1004.                    p->data[0][0]= get_bits(&s->gb, 8);

  1005. 

  1006.             switch(s->predictor){

  1007.             case LEFT:

  1008.             case PLANE:

  1009.                 decode_422_bitstream(s, width-2);

  1010.                 lefty= add_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);

  1011.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1012.                     leftu= add_left_prediction(p->data[1] + 1, s->temp[1], width2-1, leftu);

  1013.                     leftv= add_left_prediction(p->data[2] + 1, s->temp[2], width2-1, leftv);

  1014.                 }

  1015. 

  1016.                 for(cy=y=1; y<s->height; y++,cy++){

  1017.                     uint8_t *ydst, *udst, *vdst;

  1018. 

  1019.                     if(s->bitstream_bpp==12){

  1020.                         decode_gray_bitstream(s, width);

  1021. 

  1022.                         ydst= p->data[0] + p->linesize[0]*y;

  1023. 

  1024.                         lefty= add_left_prediction(ydst, s->temp[0], width, lefty);

  1025.                         if(s->predictor == PLANE){

  1026.                             if(y>s->interlaced)

  1027.                                 s->dsp.add_bytes(ydst, ydst - fake_ystride, width);

  1028.                         }

  1029.                         y++;

  1030.                         if(y>=s->height) break;

  1031.                     }

  1032. 

  1033.                     draw_slice(s, y);

  1034. 

  1035.                     ydst= p->data[0] + p->linesize[0]*y;

  1036.                     udst= p->data[1] + p->linesize[1]*cy;

  1037.                     vdst= p->data[2] + p->linesize[2]*cy;

  1038. 

  1039.                     decode_422_bitstream(s, width);

  1040.                     lefty= add_left_prediction(ydst, s->temp[0], width, lefty);

  1041.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1042.                         leftu= add_left_prediction(udst, s->temp[1], width2, leftu);

  1043.                         leftv= add_left_prediction(vdst, s->temp[2], width2, leftv);

  1044.                     }

  1045.                     if(s->predictor == PLANE){

  1046.                         if(cy>s->interlaced){

  1047.                             s->dsp.add_bytes(ydst, ydst - fake_ystride, width);

  1048.                             if(!(s->flags&CODEC_FLAG_GRAY)){

  1049.                                 s->dsp.add_bytes(udst, udst - fake_ustride, width2);

  1050.                                 s->dsp.add_bytes(vdst, vdst - fake_vstride, width2);

  1051.                             }

  1052.                         }

  1053.                     }

  1054.                 }

  1055.                 draw_slice(s, height);

  1056. 

  1057.                 break;

  1058.             case MEDIAN:

  1059.                 /* first line except first 2 pixels is left predicted */

  1060.                 decode_422_bitstream(s, width-2);

  1061.                 lefty= add_left_prediction(p->data[0] + 2, s->temp[0], width-2, lefty);

  1062.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1063.                     leftu= add_left_prediction(p->data[1] + 1, s->temp[1], width2-1, leftu);

  1064.                     leftv= add_left_prediction(p->data[2] + 1, s->temp[2], width2-1, leftv);

  1065.                 }

  1066. 

  1067.                 cy=y=1;

  1068. 

  1069.                 /* second line is left predicted for interlaced case */

  1070.                 if(s->interlaced){

  1071.                     decode_422_bitstream(s, width);

  1072.                     lefty= add_left_prediction(p->data[0] + p->linesize[0], s->temp[0], width, lefty);

  1073.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1074.                         leftu= add_left_prediction(p->data[1] + p->linesize[2], s->temp[1], width2, leftu);

  1075.                         leftv= add_left_prediction(p->data[2] + p->linesize[1], s->temp[2], width2, leftv);

  1076.                     }

  1077.                     y++; cy++;

  1078.                 }

  1079. 

  1080.                 /* next 4 pixels are left predicted too */

  1081.                 decode_422_bitstream(s, 4);

  1082.                 lefty= add_left_prediction(p->data[0] + fake_ystride, s->temp[0], 4, lefty);

  1083.                 if(!(s->flags&CODEC_FLAG_GRAY)){

  1084.                     leftu= add_left_prediction(p->data[1] + fake_ustride, s->temp[1], 2, leftu);

  1085.                     leftv= add_left_prediction(p->data[2] + fake_vstride, s->temp[2], 2, leftv);

  1086.                 }

  1087. 

  1088.                 /* next line except the first 4 pixels is median predicted */

  1089.                 lefttopy= p->data[0][3];

  1090.                 decode_422_bitstream(s, width-4);

  1091.                 s->dsp.add_hfyu_median_prediction(p->data[0] + fake_ystride+4, p->data[0]+4, s->temp[0], width-4, &lefty, &lefttopy);

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

  1093.                     lefttopu= p->data[1][1];

  1094.                     lefttopv= p->data[2][1];

  1095.                     s->dsp.add_hfyu_median_prediction(p->data[1] + fake_ustride+2, p->data[1]+2, s->temp[1], width2-2, &leftu, &lefttopu);

  1096.                     s->dsp.add_hfyu_median_prediction(p->data[2] + fake_vstride+2, p->data[2]+2, s->temp[2], width2-2, &leftv, &lefttopv);

  1097.                 }

  1098.                 y++; cy++;

  1099. 

  1100.                 for(; y<height; y++,cy++){

  1101.                     uint8_t *ydst, *udst, *vdst;

  1102. 

  1103.                     if(s->bitstream_bpp==12){

  1104.                         while(2*cy > y){

  1105.                             decode_gray_bitstream(s, width);

  1106.                             ydst= p->data[0] + p->linesize[0]*y;

  1107.                             s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);

  1108.                             y++;

  1109.                         }

  1110.                         if(y>=height) break;

  1111.                     }

  1112.                     draw_slice(s, y);

  1113. 

  1114.                     decode_422_bitstream(s, width);

  1115. 

  1116.                     ydst= p->data[0] + p->linesize[0]*y;

  1117.                     udst= p->data[1] + p->linesize[1]*cy;

  1118.                     vdst= p->data[2] + p->linesize[2]*cy;

  1119. 

  1120.                     s->dsp.add_hfyu_median_prediction(ydst, ydst - fake_ystride, s->temp[0], width, &lefty, &lefttopy);

  1121.                     if(!(s->flags&CODEC_FLAG_GRAY)){

  1122.                         s->dsp.add_hfyu_median_prediction(udst, udst - fake_ustride, s->temp[1], width2, &leftu, &lefttopu);

  1123.                         s->dsp.add_hfyu_median_prediction(vdst, vdst - fake_vstride, s->temp[2], width2, &leftv, &lefttopv);

  1124.                     }

  1125.                 }

  1126. 

  1127.                 draw_slice(s, height);

  1128.                 break;

  1129.             }

  1130.         }

  1131.     }else{

  1132.         int y;

  1133.         int leftr, leftg, leftb;

  1134.         const int last_line= (height-1)*p->linesize[0];

  1135. 

  1136.         if(s->bitstream_bpp==32){

  1137.             skip_bits(&s->gb, 8);

  1138.             leftr= p->data[0][last_line+R]= get_bits(&s->gb, 8);

  1139.             leftg= p->data[0][last_line+G]= get_bits(&s->gb, 8);

  1140.             leftb= p->data[0][last_line+B]= get_bits(&s->gb, 8);

  1141.         }else{

  1142.             leftr= p->data[0][last_line+R]= get_bits(&s->gb, 8);

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

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

  1145.             skip_bits(&s->gb, 8);

  1146.         }

  1147. 

  1148.         if(s->bgr32){

  1149.             switch(s->predictor){

  1150.             case LEFT:

  1151.             case PLANE:

  1152.                 decode_bgr_bitstream(s, width-1);

  1153.                 add_left_prediction_bgr32(p->data[0] + last_line+4, s->temp[0], width-1, &leftr, &leftg, &leftb);

  1154. 

  1155.                 for(y=s->height-2; y>=0; y--){ //Yes it is stored upside down.

  1156.                     decode_bgr_bitstream(s, width);

  1157. 

  1158.                     add_left_prediction_bgr32(p->data[0] + p->linesize[0]*y, s->temp[0], width, &leftr, &leftg, &leftb);

  1159.                     if(s->predictor == PLANE){

  1160.                         if((y&s->interlaced)==0 && y<s->height-1-s->interlaced){

  1161.                             s->dsp.add_bytes(p->data[0] + p->linesize[0]*y,

  1162.                                              p->data[0] + p->linesize[0]*y + fake_ystride, fake_ystride);

  1163.                         }

  1164.                     }

  1165.                 }

  1166.                 draw_slice(s, height); // just 1 large slice as this is not possible in reverse order

  1167.                 break;

  1168.             default:

  1169.                 av_log(avctx, AV_LOG_ERROR, "prediction type not supported!\n");

  1170.             }

  1171.         }else{

  1172. 

  1173.             av_log(avctx, AV_LOG_ERROR, "BGR24 output is not implemented yet\n");

  1174.             return -1;

  1175.         }

  1176.     }

  1177.     emms_c();

  1178. 

  1179.     *picture= *p;

  1180.     *data_size = sizeof(AVFrame);

  1181. 

  1182.     return (get_bits_count(&s->gb)+31)/32*4 + table_size;

  1183. }

  1184. #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */

  1185. 

  1186. static int common_end(HYuvContext *s){

  1187.     int i;

  1188. 

  1189.     for(i=0; i<3; i++){

  1190.         av_freep(&s->temp[i]);

  1191.     }

  1192.     return 0;

  1193. }

  1194. 

  1195. #if CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER

  1196. static av_cold int decode_end(AVCodecContext *avctx)

  1197. {

  1198.     HYuvContext *s = avctx->priv_data;

  1199.     int i;

  1200. 

  1201.     common_end(s);

  1202.     av_freep(&s->bitstream_buffer);

  1203. 

  1204.     for(i=0; i<6; i++){

  1205.         free_vlc(&s->vlc[i]);

  1206.     }

  1207. 

  1208.     return 0;

  1209. }

  1210. #endif /* CONFIG_HUFFYUV_DECODER || CONFIG_FFVHUFF_DECODER */

  1211. 

  1212. #if CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER

  1213. static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){

  1214.     HYuvContext *s = avctx->priv_data;

  1215.     AVFrame *pict = data;

  1216.     const int width= s->width;

  1217.     const int width2= s->width>>1;

  1218.     const int height= s->height;

  1219.     const int fake_ystride= s->interlaced ? pict->linesize[0]*2  : pict->linesize[0];

  1220.     const int fake_ustride= s->interlaced ? pict->linesize[1]*2  : pict->linesize[1];

  1221.     const int fake_vstride= s->interlaced ? pict->linesize[2]*2  : pict->linesize[2];

  1222.     AVFrame * const p= &s->picture;

  1223.     int i, j, size=0;

  1224. 

  1225.     *p = *pict;

  1226.     p->pict_type= FF_I_TYPE;

  1227.     p->key_frame= 1;

  1228. 

  1229.     if(s->context){

  1230.         for(i=0; i<3; i++){

  1231.             generate_len_table(s->len[i], s->stats[i], 256);

  1232.             if(generate_bits_table(s->bits[i], s->len[i])<0)

  1233.                 return -1;

  1234.             size+= store_table(s, s->len[i], &buf[size]);

  1235.         }

  1236. 

  1237.         for(i=0; i<3; i++)

  1238.             for(j=0; j<256; j++)

  1239.                 s->stats[i][j] >>= 1;

  1240.     }

  1241. 

  1242.     init_put_bits(&s->pb, buf+size, buf_size-size);

  1243. 

  1244.     if(avctx->pix_fmt == PIX_FMT_YUV422P || avctx->pix_fmt == PIX_FMT_YUV420P){

  1245.         int lefty, leftu, leftv, y, cy;

  1246. 

  1247.         put_bits(&s->pb, 8, leftv= p->data[2][0]);

  1248.         put_bits(&s->pb, 8, lefty= p->data[0][1]);

  1249.         put_bits(&s->pb, 8, leftu= p->data[1][0]);

  1250.         put_bits(&s->pb, 8,        p->data[0][0]);

  1251. 

  1252.         lefty= sub_left_prediction(s, s->temp[0], p->data[0]+2, width-2 , lefty);

  1253.         leftu= sub_left_prediction(s, s->temp[1], p->data[1]+1, width2-1, leftu);

  1254.         leftv= sub_left_prediction(s, s->temp[2], p->data[2]+1, width2-1, leftv);

  1255. 

  1256.         encode_422_bitstream(s, width-2);

  1257. 

  1258.         if(s->predictor==MEDIAN){

  1259.             int lefttopy, lefttopu, lefttopv;

  1260.             cy=y=1;

  1261.             if(s->interlaced){

  1262.                 lefty= sub_left_prediction(s, s->temp[0], p->data[0]+p->linesize[0], width , lefty);

  1263.                 leftu= sub_left_prediction(s, s->temp[1], p->data[1]+p->linesize[1], width2, leftu);

  1264.                 leftv= sub_left_prediction(s, s->temp[2], p->data[2]+p->linesize[2], width2, leftv);

  1265. 

  1266.                 encode_422_bitstream(s, width);

  1267.                 y++; cy++;

  1268.             }

  1269. 

  1270.             lefty= sub_left_prediction(s, s->temp[0], p->data[0]+fake_ystride, 4, lefty);

  1271.             leftu= sub_left_prediction(s, s->temp[1], p->data[1]+fake_ustride, 2, leftu);

  1272.             leftv= sub_left_prediction(s, s->temp[2], p->data[2]+fake_vstride, 2, leftv);

  1273. 

  1274.             encode_422_bitstream(s, 4);

  1275. 

  1276.             lefttopy= p->data[0][3];

  1277.             lefttopu= p->data[1][1];

  1278.             lefttopv= p->data[2][1];

  1279.             s->dsp.sub_hfyu_median_prediction(s->temp[0], p->data[0]+4, p->data[0] + fake_ystride+4, width-4 , &lefty, &lefttopy);

  1280.             s->dsp.sub_hfyu_median_prediction(s->temp[1], p->data[1]+2, p->data[1] + fake_ustride+2, width2-2, &leftu, &lefttopu);

  1281.             s->dsp.sub_hfyu_median_prediction(s->temp[2], p->data[2]+2, p->data[2] + fake_vstride+2, width2-2, &leftv, &lefttopv);

  1282.             encode_422_bitstream(s, width-4);

  1283.             y++; cy++;

  1284. 

  1285.             for(; y<height; y++,cy++){

  1286.                 uint8_t *ydst, *udst, *vdst;

  1287. 

  1288.                 if(s->bitstream_bpp==12){

  1289.                     while(2*cy > y){

  1290.                         ydst= p->data[0] + p->linesize[0]*y;

  1291.                         s->dsp.sub_hfyu_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);

  1292.                         encode_gray_bitstream(s, width);

  1293.                         y++;

  1294.                     }

  1295.                     if(y>=height) break;

  1296.                 }

  1297.                 ydst= p->data[0] + p->linesize[0]*y;

  1298.                 udst= p->data[1] + p->linesize[1]*cy;

  1299.                 vdst= p->data[2] + p->linesize[2]*cy;

  1300. 

  1301.                 s->dsp.sub_hfyu_median_prediction(s->temp[0], ydst - fake_ystride, ydst, width , &lefty, &lefttopy);

  1302.                 s->dsp.sub_hfyu_median_prediction(s->temp[1], udst - fake_ustride, udst, width2, &leftu, &lefttopu);

  1303.                 s->dsp.sub_hfyu_median_prediction(s->temp[2], vdst - fake_vstride, vdst, width2, &leftv, &lefttopv);

  1304. 

  1305.                 encode_422_bitstream(s, width);

  1306.             }

  1307.         }else{

  1308.             for(cy=y=1; y<height; y++,cy++){

  1309.                 uint8_t *ydst, *udst, *vdst;

  1310. 

  1311.                 /* encode a luma only line & y++ */

  1312.                 if(s->bitstream_bpp==12){

  1313.                     ydst= p->data[0] + p->linesize[0]*y;

  1314. 

  1315.                     if(s->predictor == PLANE && s->interlaced < y){

  1316.                         s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);

  1317. 

  1318.                         lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);

  1319.                     }else{

  1320.                         lefty= sub_left_prediction(s, s->temp[0], ydst, width , lefty);

  1321.                     }

  1322.                     encode_gray_bitstream(s, width);

  1323.                     y++;

  1324.                     if(y>=height) break;

  1325.                 }

  1326. 

  1327.                 ydst= p->data[0] + p->linesize[0]*y;

  1328.                 udst= p->data[1] + p->linesize[1]*cy;

  1329.                 vdst= p->data[2] + p->linesize[2]*cy;

  1330. 

  1331.                 if(s->predictor == PLANE && s->interlaced < cy){

  1332.                     s->dsp.diff_bytes(s->temp[1], ydst, ydst - fake_ystride, width);

  1333.                     s->dsp.diff_bytes(s->temp[2], udst, udst - fake_ustride, width2);

  1334.                     s->dsp.diff_bytes(s->temp[2] + width2, vdst, vdst - fake_vstride, width2);

  1335. 

  1336.                     lefty= sub_left_prediction(s, s->temp[0], s->temp[1], width , lefty);

  1337.                     leftu= sub_left_prediction(s, s->temp[1], s->temp[2], width2, leftu);

  1338.                     leftv= sub_left_prediction(s, s->temp[2], s->temp[2] + width2, width2, leftv);

  1339.                 }else{

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

  1341.                     leftu= sub_left_prediction(s, s->temp[1], udst, width2, leftu);

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

  1343.                 }

  1344. 

  1345.                 encode_422_bitstream(s, width);

  1346.             }

  1347.         }

  1348.     }else if(avctx->pix_fmt == PIX_FMT_RGB32){

  1349.         uint8_t *data = p->data[0] + (height-1)*p->linesize[0];

  1350.         const int stride = -p->linesize[0];

  1351.         const int fake_stride = -fake_ystride;

  1352.         int y;

  1353.         int leftr, leftg, leftb;

  1354. 

  1355.         put_bits(&s->pb, 8, leftr= data[R]);

  1356.         put_bits(&s->pb, 8, leftg= data[G]);

  1357.         put_bits(&s->pb, 8, leftb= data[B]);

  1358.         put_bits(&s->pb, 8, 0);

  1359. 

  1360.         sub_left_prediction_bgr32(s, s->temp[0], data+4, width-1, &leftr, &leftg, &leftb);

  1361.         encode_bgr_bitstream(s, width-1);

  1362. 

  1363.         for(y=1; y<s->height; y++){

  1364.             uint8_t *dst = data + y*stride;

  1365.             if(s->predictor == PLANE && s->interlaced < y){

  1366.                 s->dsp.diff_bytes(s->temp[1], dst, dst - fake_stride, width*4);

  1367.                 sub_left_prediction_bgr32(s, s->temp[0], s->temp[1], width, &leftr, &leftg, &leftb);

  1368.             }else{

  1369.                 sub_left_prediction_bgr32(s, s->temp[0], dst, width, &leftr, &leftg, &leftb);

  1370.             }

  1371.             encode_bgr_bitstream(s, width);

  1372.         }

  1373.     }else{

  1374.         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");

  1375.     }

  1376.     emms_c();

  1377. 

  1378.     size+= (put_bits_count(&s->pb)+31)/8;

  1379.     size/= 4;

  1380. 

  1381.     if((s->flags&CODEC_FLAG_PASS1) && (s->picture_number&31)==0){

  1382.         int j;

  1383.         char *p= avctx->stats_out;

  1384.         char *end= p + 1024*30;

  1385.         for(i=0; i<3; i++){

  1386.             for(j=0; j<256; j++){

  1387.                 snprintf(p, end-p, "%"PRIu64" ", s->stats[i][j]);

  1388.                 p+= strlen(p);

  1389.                 s->stats[i][j]= 0;

  1390.             }

  1391.             snprintf(p, end-p, "\n");

  1392.             p++;

  1393.         }

  1394.     } else

  1395.         avctx->stats_out[0] = '\0';

  1396.     if(!(s->avctx->flags2 & CODEC_FLAG2_NO_OUTPUT)){

  1397.         flush_put_bits(&s->pb);

  1398.         s->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, size);

  1399.     }

  1400. 

  1401.     s->picture_number++;

  1402. 

  1403.     return size*4;

  1404. }

  1405. 

  1406. static av_cold int encode_end(AVCodecContext *avctx)

  1407. {

  1408.     HYuvContext *s = avctx->priv_data;

  1409. 

  1410.     common_end(s);

  1411. 

  1412.     av_freep(&avctx->extradata);

  1413.     av_freep(&avctx->stats_out);

  1414. 

  1415.     return 0;

  1416. }

  1417. #endif /* CONFIG_HUFFYUV_ENCODER || CONFIG_FFVHUFF_ENCODER */

  1418. 

  1419. #if CONFIG_HUFFYUV_DECODER

  1420. AVCodec huffyuv_decoder = {

  1421.     "huffyuv",

  1422.     CODEC_TYPE_VIDEO,

  1423.     CODEC_ID_HUFFYUV,

  1424.     sizeof(HYuvContext),

  1425.     decode_init,

  1426.     NULL,

  1427.     decode_end,

  1428.     decode_frame,

  1429.     CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,

  1430.     NULL,

  1431.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv / HuffYUV"),

  1432. };

  1433. #endif

  1434. 

  1435. #if CONFIG_FFVHUFF_DECODER

  1436. AVCodec ffvhuff_decoder = {

  1437.     "ffvhuff",

  1438.     CODEC_TYPE_VIDEO,

  1439.     CODEC_ID_FFVHUFF,

  1440.     sizeof(HYuvContext),

  1441.     decode_init,

  1442.     NULL,

  1443.     decode_end,

  1444.     decode_frame,

  1445.     CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,

  1446.     NULL,

  1447.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1448. };

  1449. #endif

  1450. 

  1451. #if CONFIG_HUFFYUV_ENCODER

  1452. AVCodec huffyuv_encoder = {

  1453.     "huffyuv",

  1454.     CODEC_TYPE_VIDEO,

  1455.     CODEC_ID_HUFFYUV,

  1456.     sizeof(HYuvContext),

  1457.     encode_init,

  1458.     encode_frame,

  1459.     encode_end,

  1460.     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},

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

  1462. };

  1463. #endif

  1464. 

  1465. #if CONFIG_FFVHUFF_ENCODER

  1466. AVCodec ffvhuff_encoder = {

  1467.     "ffvhuff",

  1468.     CODEC_TYPE_VIDEO,

  1469.     CODEC_ID_FFVHUFF,

  1470.     sizeof(HYuvContext),

  1471.     encode_init,

  1472.     encode_frame,

  1473.     encode_end,

  1474.     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},

  1475.     .long_name = NULL_IF_CONFIG_SMALL("Huffyuv FFmpeg variant"),

  1476. };

  1477. #endif