falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
2892 Commits
32 Branches
511MB
Tree: 9e2a16e1a7
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '9e2a16e1a7'
${ noResults }
FFmpeg/libavcodec/dv.c

1025 lines
31KB
Raw Blame History 

  1. /*

  2.  * DV decoder

  3.  * Copyright (c) 2002 Fabrice Bellard.

  4.  *

  5.  * DV encoder 

  6.  * Copyright (c) 2003 Roman Shaposhnik.

  7.  *

  8.  * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth

  9.  * of DV technical info.

  10.  *

  11.  * This library 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 of the License, or (at your option) any later version.

  15.  *

  16.  * This library 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 this library; if not, write to the Free Software

  23.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

  24.  */

  25. 

  26. /**

  27.  * @file dv.c

  28.  * DV codec.

  29.  */

  30. #include "avcodec.h"

  31. #include "dsputil.h"

  32. #include "mpegvideo.h"

  33. #include "simple_idct.h"

  34. #include "dvdata.h"

  35. 

  36. typedef struct DVVideoDecodeContext {

  37.     const DVprofile* sys;

  38.     AVFrame picture;

  39.     

  40.     uint8_t dv_zigzag[2][64];

  41.     uint8_t dv_idct_shift[2][22][64];

  42.   

  43.     void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);

  44.     void (*fdct[2])(DCTELEM *block);

  45.     void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);

  46.     

  47.     GetBitContext gb;

  48.     DCTELEM block[5*6][64] __align8;

  49. } DVVideoDecodeContext;

  50. 

  51. #define TEX_VLC_BITS 9

  52. 

  53. #ifdef DV_CODEC_TINY_TARGET

  54. #define DV_VLC_MAP_RUN_SIZE 15

  55. #define DV_VLC_MAP_LEV_SIZE 23

  56. #else

  57. #define DV_VLC_MAP_RUN_SIZE  64 

  58. #define DV_VLC_MAP_LEV_SIZE 512

  59. #endif

  60. 

  61. /* XXX: also include quantization */

  62. static RL_VLC_ELEM *dv_rl_vlc[1];

  63. /* VLC encoding lookup table */

  64. static struct dv_vlc_pair {

  65.    uint32_t vlc;

  66.    uint8_t  size;

  67. } (*dv_vlc_map)[DV_VLC_MAP_LEV_SIZE] = NULL;

  68. 

  69. static void dv_build_unquantize_tables(DVVideoDecodeContext *s, uint8_t* perm)

  70. {

  71.     int i, q, j;

  72. 

  73.     /* NOTE: max left shift is 6 */

  74.     for(q = 0; q < 22; q++) {

  75.         /* 88DCT */

  76.         for(i = 1; i < 64; i++) {

  77.             /* 88 table */

  78.             j = perm[i];

  79.             s->dv_idct_shift[0][q][j] =

  80.                 dv_quant_shifts[q][dv_88_areas[i]] + 1;

  81.         }

  82.         

  83.         /* 248DCT */

  84.         for(i = 1; i < 64; i++) {

  85.             /* 248 table */

  86.             s->dv_idct_shift[1][q][i] =  

  87.                 dv_quant_shifts[q][dv_248_areas[i]] + 1;

  88.         }

  89.     }

  90. }

  91. 

  92. static int dvvideo_init(AVCodecContext *avctx)

  93. {

  94.     DVVideoDecodeContext *s = avctx->priv_data;

  95.     DSPContext dsp;

  96.     static int done=0;

  97.     int i, j;

  98. 

  99.     if (!done) {

  100.         int i;

  101.         VLC dv_vlc;

  102. 

  103.         done = 1;

  104. 

  105.         dv_vlc_map = av_mallocz(DV_VLC_MAP_LEV_SIZE*DV_VLC_MAP_RUN_SIZE*sizeof(struct dv_vlc_pair));

  106. 	if (!dv_vlc_map)

  107. 	    return -ENOMEM;

  108. 

  109.         /* NOTE: as a trick, we use the fact the no codes are unused

  110.            to accelerate the parsing of partial codes */

  111.         init_vlc(&dv_vlc, TEX_VLC_BITS, NB_DV_VLC, 

  112.                  dv_vlc_len, 1, 1, dv_vlc_bits, 2, 2);

  113. 

  114.         dv_rl_vlc[0] = av_malloc(dv_vlc.table_size * sizeof(RL_VLC_ELEM));

  115. 	if (!dv_rl_vlc[0]) {

  116. 	    av_free(dv_vlc_map);

  117. 	    return -ENOMEM;

  118. 	}

  119.         for(i = 0; i < dv_vlc.table_size; i++){

  120.             int code= dv_vlc.table[i][0];

  121.             int len = dv_vlc.table[i][1];

  122.             int level, run;

  123.         

  124.             if(len<0){ //more bits needed

  125.                 run= 0;

  126.                 level= code;

  127.             } else if (code == (NB_DV_VLC - 1)) {

  128.                 /* EOB */

  129.                 run = 0;

  130.                 level = 256;

  131.             } else {

  132.                 run=   dv_vlc_run[code] + 1;

  133.                 level= dv_vlc_level[code];

  134.             }

  135.             dv_rl_vlc[0][i].len = len;

  136.             dv_rl_vlc[0][i].level = level;

  137.             dv_rl_vlc[0][i].run = run;

  138.         }

  139. 

  140. 	for (i = 0; i < NB_DV_VLC - 1; i++) {

  141.            if (dv_vlc_run[i] >= DV_VLC_MAP_RUN_SIZE || dv_vlc_level[i] >= DV_VLC_MAP_LEV_SIZE)

  142. 	       continue;

  143. 	   

  144. 	   if (dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size != 0)

  145. 	       continue;

  146. 	       

  147. 	   dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].vlc = dv_vlc_bits[i] << 

  148. 	                                                    (!!dv_vlc_level[i]);

  149. 	   dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size = dv_vlc_len[i] + 

  150. 	                                                     (!!dv_vlc_level[i]);

  151. 	}

  152. 	for (i = 0; i < DV_VLC_MAP_RUN_SIZE; i++) {

  153. #ifdef DV_CODEC_TINY_TARGET

  154. 	   for (j = 1; j < DV_VLC_MAP_LEV_SIZE; j++) {

  155. 	      if (dv_vlc_map[i][j].size == 0) {

  156. 	          dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |

  157. 		            (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));

  158. 	          dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size + 

  159. 		                          dv_vlc_map[0][j].size;

  160. 	      }

  161. 	   }

  162. #else

  163. 	   for (j = 1; j < DV_VLC_MAP_LEV_SIZE/2; j++) {

  164. 	      if (dv_vlc_map[i][j].size == 0) {

  165. 	          dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |

  166. 		            (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));

  167. 	          dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size + 

  168. 		                          dv_vlc_map[0][j].size;

  169. 	      }

  170. 	      dv_vlc_map[i][((uint16_t)(-j))&0x1ff].vlc = 

  171. 	                                    dv_vlc_map[i][j].vlc | 1;

  172. 	      dv_vlc_map[i][((uint16_t)(-j))&0x1ff].size = 

  173. 	                                    dv_vlc_map[i][j].size;

  174. 	   }

  175. #endif

  176. 	}

  177.     }

  178. 

  179.     /* Generic DSP setup */

  180.     dsputil_init(&dsp, avctx);

  181.     s->get_pixels = dsp.get_pixels;

  182. 

  183.     /* 88DCT setup */

  184.     s->fdct[0] = dsp.fdct;

  185.     s->idct_put[0] = dsp.idct_put;

  186.     for (i=0; i<64; i++)

  187.        s->dv_zigzag[0][i] = dsp.idct_permutation[ff_zigzag_direct[i]];

  188. 

  189.     /* 248DCT setup */

  190.     s->fdct[1] = dsp.fdct248;

  191.     s->idct_put[1] = simple_idct248_put;  // FIXME: need to add it to DSP

  192.     memcpy(s->dv_zigzag[1], ff_zigzag248_direct, 64);

  193. 

  194.     /* XXX: do it only for constant case */

  195.     dv_build_unquantize_tables(s, dsp.idct_permutation);

  196. 

  197.     /* FIXME: I really don't think this should be here */

  198.     if (dv_codec_profile(avctx))

  199. 	avctx->pix_fmt = dv_codec_profile(avctx)->pix_fmt; 

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

  201.     

  202.     return 0;

  203. }

  204. 

  205. // #define VLC_DEBUG

  206. 

  207. typedef struct BlockInfo {

  208.     const uint8_t *shift_table;

  209.     const uint8_t *scan_table;

  210.     uint8_t pos; /* position in block */

  211.     uint8_t eob_reached; /* true if EOB has been reached */

  212.     uint8_t dct_mode;

  213.     uint8_t partial_bit_count;

  214.     uint16_t partial_bit_buffer;

  215.     int shift_offset;

  216. } BlockInfo;

  217. 

  218. /* block size in bits */

  219. static const uint16_t block_sizes[6] = {

  220.     112, 112, 112, 112, 80, 80

  221. };

  222. /* bit budget for AC only in 5 MBs */

  223. static const int vs_total_ac_bits = (100 * 4 + 68*2) * 5;

  224. /* see dv_88_areas and dv_248_areas for details */

  225. static const int mb_area_start[5] = { 1, 6, 21, 43, 64 }; 

  226. 

  227. #ifndef ALT_BITSTREAM_READER

  228. #warning only works with ALT_BITSTREAM_READER

  229. #endif

  230. 

  231. /* decode ac coefs */

  232. static void dv_decode_ac(DVVideoDecodeContext *s, 

  233.                          BlockInfo *mb, DCTELEM *block, int last_index)

  234. {

  235.     int last_re_index;

  236.     int shift_offset = mb->shift_offset;

  237.     const uint8_t *scan_table = mb->scan_table;

  238.     const uint8_t *shift_table = mb->shift_table;

  239.     int pos = mb->pos;

  240.     int level, pos1, sign, run;

  241.     int partial_bit_count;

  242. #ifndef ALT_BITSTREAM_READER //FIXME

  243.     int re_index=0; 

  244.     int re1_index=0;

  245. #endif

  246.     OPEN_READER(re, &s->gb);

  247.     

  248. #ifdef VLC_DEBUG

  249.     printf("start\n");

  250. #endif

  251. 

  252.     /* if we must parse a partial vlc, we do it here */

  253.     partial_bit_count = mb->partial_bit_count;

  254.     if (partial_bit_count > 0) {

  255.         uint8_t buf[4];

  256.         uint32_t v;

  257.         int l, l1;

  258.         GetBitContext gb1;

  259. 

  260.         /* build the dummy bit buffer */

  261.         l = 16 - partial_bit_count;

  262.         UPDATE_CACHE(re, &s->gb);

  263. #ifdef VLC_DEBUG

  264.         printf("show=%04x\n", SHOW_UBITS(re, &s->gb, 16));

  265. #endif

  266.         v = (mb->partial_bit_buffer << l) | SHOW_UBITS(re, &s->gb, l);

  267.         buf[0] = v >> 8;

  268.         buf[1] = v;

  269. #ifdef VLC_DEBUG

  270.         printf("v=%04x cnt=%d %04x\n", 

  271.                v, partial_bit_count, (mb->partial_bit_buffer << l));

  272. #endif

  273.         /* try to read the codeword */

  274.         init_get_bits(&gb1, buf, 4*8);

  275.         {

  276.             OPEN_READER(re1, &gb1);

  277.             UPDATE_CACHE(re1, &gb1);

  278.             GET_RL_VLC(level, run, re1, &gb1, dv_rl_vlc[0], 

  279.                        TEX_VLC_BITS, 2);

  280.             l = re1_index;

  281.             CLOSE_READER(re1, &gb1);

  282.         }

  283. #ifdef VLC_DEBUG

  284.         printf("****run=%d level=%d size=%d\n", run, level, l);

  285. #endif

  286.         /* compute codeword length */

  287.         l1 = (level != 256 && level != 0);

  288.         /* if too long, we cannot parse */

  289.         l -= partial_bit_count;

  290.         if ((re_index + l + l1) > last_index)

  291.             return;

  292.         /* skip read bits */

  293.         last_re_index = 0; /* avoid warning */

  294.         re_index += l;

  295.         /* by definition, if we can read the vlc, all partial bits

  296.            will be read (otherwise we could have read the vlc before) */

  297.         mb->partial_bit_count = 0;

  298.         UPDATE_CACHE(re, &s->gb);

  299.         goto handle_vlc;

  300.     }

  301. 

  302.     /* get the AC coefficients until last_index is reached */

  303.     for(;;) {

  304.         UPDATE_CACHE(re, &s->gb);

  305. #ifdef VLC_DEBUG

  306.         printf("%2d: bits=%04x index=%d\n", 

  307.                pos, SHOW_UBITS(re, &s->gb, 16), re_index);

  308. #endif

  309.         last_re_index = re_index;

  310.         GET_RL_VLC(level, run, re, &s->gb, dv_rl_vlc[0], 

  311.                    TEX_VLC_BITS, 2);

  312.     handle_vlc:

  313. #ifdef VLC_DEBUG

  314.         printf("run=%d level=%d\n", run, level);

  315. #endif

  316.         if (level == 256) {

  317.             if (re_index > last_index) {

  318.             cannot_read:

  319.                 /* put position before read code */

  320.                 re_index = last_re_index;

  321.                 mb->eob_reached = 0;

  322.                 break;

  323.             }

  324.             /* EOB */

  325.             mb->eob_reached = 1;

  326.             break;

  327.         } else if (level != 0) {

  328.             if ((re_index + 1) > last_index)

  329.                 goto cannot_read;

  330.             sign = SHOW_SBITS(re, &s->gb, 1);

  331.             level = (level ^ sign) - sign;

  332.             LAST_SKIP_BITS(re, &s->gb, 1);

  333.             pos += run;

  334.             /* error */

  335.             if (pos >= 64) {

  336.                 goto read_error;

  337.             }

  338.             pos1 = scan_table[pos];

  339.             level = level << (shift_table[pos1] + shift_offset);

  340.             block[pos1] = level;

  341.             //            printf("run=%d level=%d shift=%d\n", run, level, shift_table[pos1]);

  342.         } else {

  343.             if (re_index > last_index)

  344.                 goto cannot_read;

  345.             /* level is zero: means run without coding. No

  346.                sign is coded */

  347.             pos += run;

  348.             /* error */

  349.             if (pos >= 64) {

  350.             read_error:

  351. #if defined(VLC_DEBUG) || 1

  352.                 av_log(NULL, AV_LOG_ERROR, "error pos=%d\n", pos);

  353. #endif

  354.                 /* for errors, we consider the eob is reached */

  355.                 mb->eob_reached = 1;

  356.                 break;

  357.             }

  358.         }

  359.     }

  360.     CLOSE_READER(re, &s->gb);

  361.     mb->pos = pos;

  362. }

  363. 

  364. static inline void bit_copy(PutBitContext *pb, GetBitContext *gb, int bits_left)

  365. {

  366.     while (bits_left >= 16) {

  367.         put_bits(pb, 16, get_bits(gb, 16));

  368.         bits_left -= 16;

  369.     }

  370.     if (bits_left > 0) {

  371.         put_bits(pb, bits_left, get_bits(gb, bits_left));

  372.     }

  373. }

  374. 

  375. /* mb_x and mb_y are in units of 8 pixels */

  376. static inline void dv_decode_video_segment(DVVideoDecodeContext *s, 

  377.                                            uint8_t *buf_ptr1, 

  378.                                            const uint16_t *mb_pos_ptr)

  379. {

  380.     int quant, dc, dct_mode, class1, j;

  381.     int mb_index, mb_x, mb_y, v, last_index;

  382.     DCTELEM *block, *block1;

  383.     int c_offset, bits_left;

  384.     uint8_t *y_ptr;

  385.     BlockInfo mb_data[5 * 6], *mb, *mb1;

  386.     void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block);

  387.     uint8_t *buf_ptr;

  388.     PutBitContext pb, vs_pb;

  389.     uint8_t mb_bit_buffer[80 + 4]; /* allow some slack */

  390.     int mb_bit_count;

  391.     uint8_t vs_bit_buffer[5 * 80 + 4]; /* allow some slack */

  392.     int vs_bit_count;

  393.     

  394.     memset(s->block, 0, sizeof(s->block));

  395. 

  396.     /* pass 1 : read DC and AC coefficients in blocks */

  397.     buf_ptr = buf_ptr1;

  398.     block1 = &s->block[0][0];

  399.     mb1 = mb_data;

  400.     init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);

  401.     vs_bit_count = 0;

  402.     for(mb_index = 0; mb_index < 5; mb_index++) {

  403.         /* skip header */

  404.         quant = buf_ptr[3] & 0x0f;

  405.         buf_ptr += 4;

  406.         init_put_bits(&pb, mb_bit_buffer, 80);

  407.         mb_bit_count = 0;

  408.         mb = mb1;

  409.         block = block1;

  410.         for(j = 0;j < 6; j++) {

  411.             /* NOTE: size is not important here */

  412.             init_get_bits(&s->gb, buf_ptr, 14*8);

  413.             

  414.             /* get the dc */

  415.             dc = get_bits(&s->gb, 9);

  416.             dc = (dc << (32 - 9)) >> (32 - 9);

  417.             dct_mode = get_bits1(&s->gb);

  418.             mb->dct_mode = dct_mode;

  419.             mb->scan_table = s->dv_zigzag[dct_mode];

  420.             class1 = get_bits(&s->gb, 2);

  421.             mb->shift_offset = (class1 == 3);

  422.             mb->shift_table = s->dv_idct_shift[dct_mode]

  423.                 [quant + dv_quant_offset[class1]];

  424.             dc = dc << 2;

  425.             /* convert to unsigned because 128 is not added in the

  426.                standard IDCT */

  427.             dc += 1024;

  428.             block[0] = dc;

  429.             last_index = block_sizes[j];

  430.             buf_ptr += last_index >> 3;

  431.             mb->pos = 0;

  432.             mb->partial_bit_count = 0;

  433. 

  434. #ifdef VLC_DEBUG

  435.             printf("MB block: %d, %d ", mb_index, j);

  436. #endif

  437.             dv_decode_ac(s, mb, block, last_index);

  438. 

  439.             /* write the remaining bits  in a new buffer only if the

  440.                block is finished */

  441.             bits_left = last_index - get_bits_count(&s->gb);

  442.             if (mb->eob_reached) {

  443.                 mb->partial_bit_count = 0;

  444.                 mb_bit_count += bits_left;

  445.                 bit_copy(&pb, &s->gb, bits_left);

  446.             } else {

  447.                 /* should be < 16 bits otherwise a codeword could have

  448.                    been parsed */

  449.                 mb->partial_bit_count = bits_left;

  450.                 mb->partial_bit_buffer = get_bits(&s->gb, bits_left);

  451.             }

  452.             block += 64;

  453.             mb++;

  454.         }

  455.         

  456.         flush_put_bits(&pb);

  457. 

  458.         /* pass 2 : we can do it just after */

  459. #ifdef VLC_DEBUG

  460.         printf("***pass 2 size=%d MB#=%d\n", mb_bit_count, mb_index);

  461. #endif

  462.         block = block1;

  463.         mb = mb1;

  464.         init_get_bits(&s->gb, mb_bit_buffer, 80*8);

  465.         for(j = 0;j < 6; j++) {

  466.             if (!mb->eob_reached && get_bits_count(&s->gb) < mb_bit_count) {

  467.                 dv_decode_ac(s, mb, block, mb_bit_count);

  468.                 /* if still not finished, no need to parse other blocks */

  469.                 if (!mb->eob_reached) {

  470.                     /* we could not parse the current AC coefficient,

  471.                        so we add the remaining bytes */

  472.                     bits_left = mb_bit_count - get_bits_count(&s->gb);

  473.                     if (bits_left > 0) {

  474.                         mb->partial_bit_count += bits_left;

  475.                         mb->partial_bit_buffer = 

  476.                             (mb->partial_bit_buffer << bits_left) | 

  477.                             get_bits(&s->gb, bits_left);

  478.                     }

  479.                     goto next_mb;

  480.                 }

  481.             }

  482.             block += 64;

  483.             mb++;

  484.         }

  485.         /* all blocks are finished, so the extra bytes can be used at

  486.            the video segment level */

  487.         bits_left = mb_bit_count - get_bits_count(&s->gb);

  488.         vs_bit_count += bits_left;

  489.         bit_copy(&vs_pb, &s->gb, bits_left);

  490.     next_mb:

  491.         mb1 += 6;

  492.         block1 += 6 * 64;

  493.     }

  494. 

  495.     /* we need a pass other the whole video segment */

  496.     flush_put_bits(&vs_pb);

  497.         

  498. #ifdef VLC_DEBUG

  499.     printf("***pass 3 size=%d\n", vs_bit_count);

  500. #endif

  501.     block = &s->block[0][0];

  502.     mb = mb_data;

  503.     init_get_bits(&s->gb, vs_bit_buffer, 5 * 80*8);

  504.     for(mb_index = 0; mb_index < 5; mb_index++) {

  505.         for(j = 0;j < 6; j++) {

  506.             if (!mb->eob_reached) {

  507. #ifdef VLC_DEBUG

  508.                 printf("start %d:%d\n", mb_index, j);

  509. #endif

  510.                 dv_decode_ac(s, mb, block, vs_bit_count);

  511.             }

  512.             block += 64;

  513.             mb++;

  514.         }

  515.     }

  516.     

  517.     /* compute idct and place blocks */

  518.     block = &s->block[0][0];

  519.     mb = mb_data;

  520.     for(mb_index = 0; mb_index < 5; mb_index++) {

  521.         v = *mb_pos_ptr++;

  522.         mb_x = v & 0xff;

  523.         mb_y = v >> 8;

  524.         y_ptr = s->picture.data[0] + (mb_y * s->picture.linesize[0] * 8) + (mb_x * 8);

  525.         if (s->sys->pix_fmt == PIX_FMT_YUV411P)

  526.             c_offset = (mb_y * s->picture.linesize[1] * 8) + ((mb_x >> 2) * 8);

  527.         else

  528.             c_offset = ((mb_y >> 1) * s->picture.linesize[1] * 8) + ((mb_x >> 1) * 8);

  529.         for(j = 0;j < 6; j++) {

  530.             idct_put = s->idct_put[mb->dct_mode];

  531.             if (j < 4) {

  532.                 if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x < (704 / 8)) {

  533.                     /* NOTE: at end of line, the macroblock is handled as 420 */

  534.                     idct_put(y_ptr + (j * 8), s->picture.linesize[0], block);

  535.                 } else {

  536.                     idct_put(y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->picture.linesize[0]),

  537.                              s->picture.linesize[0], block);

  538.                 }

  539.             } else {

  540.                 if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) {

  541.                     uint64_t aligned_pixels[64/8];

  542.                     uint8_t *pixels= (uint8_t*)aligned_pixels;

  543. 		    uint8_t *c_ptr, *c_ptr1, *ptr;

  544.                     int y, linesize;

  545.                     /* NOTE: at end of line, the macroblock is handled as 420 */

  546.                     idct_put(pixels, 8, block);

  547.                     linesize = s->picture.linesize[6 - j];

  548.                     c_ptr = s->picture.data[6 - j] + c_offset;

  549.                     ptr = pixels;

  550.                     for(y = 0;y < 8; y++) {

  551.                         /* convert to 411P */

  552.                         c_ptr1 = c_ptr + 8*linesize;

  553.                         c_ptr[0]= ptr[0]; c_ptr1[0]= ptr[4];

  554.                         c_ptr[1]= ptr[1]; c_ptr1[1]= ptr[5];

  555.                         c_ptr[2]= ptr[2]; c_ptr1[2]= ptr[6];

  556.                         c_ptr[3]= ptr[3]; c_ptr1[3]= ptr[7];

  557.                         c_ptr += linesize;

  558.                         ptr += 8;

  559.                     }

  560.                 } else {

  561.                     /* don't ask me why they inverted Cb and Cr ! */

  562.                     idct_put(s->picture.data[6 - j] + c_offset, 

  563.                              s->picture.linesize[6 - j], block);

  564.                 }

  565.             }

  566.             block += 64;

  567.             mb++;

  568.         }

  569.     }

  570. }

  571. 

  572. #ifdef DV_CODEC_TINY_TARGET

  573. /* Converts run and level (where level != 0) pair into vlc, returning bit size */

  574. static always_inline int dv_rl2vlc(int run, int l, uint32_t* vlc)

  575. {

  576.     int sign = l >> 8;

  577.     int level = (l ^ sign) - sign;

  578.     int size;

  579.     

  580.     sign = (sign & 1);

  581. 

  582.     if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) {

  583.         *vlc = dv_vlc_map[run][level].vlc | sign;

  584. 	size = dv_vlc_map[run][level].size;

  585.     }

  586.     else { 

  587.         if (level < DV_VLC_MAP_LEV_SIZE) {

  588. 	    *vlc = dv_vlc_map[0][level].vlc | sign;

  589. 	    size = dv_vlc_map[0][level].size;

  590. 	} else {

  591.             *vlc = 0xfe00 | (level << 1) | sign;

  592. 	    size = 16;

  593. 	}

  594. 	if (run) {

  595. 	    *vlc |= ((run < 16) ? dv_vlc_map[run-1][0].vlc : 

  596. 	                          (0x1f80 | (run - 1))) << size;

  597. 	    size += (run < 16) ? dv_vlc_map[run-1][0].size : 13;

  598. 	}

  599.     }

  600.     

  601.     return size;

  602. }

  603. 

  604. static always_inline int dv_rl2vlc_size(int run, int l)

  605. {

  606.     int level = (l ^ (l >> 8)) - (l >> 8);

  607.     int size;

  608.     

  609.     if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) {

  610. 	size = dv_vlc_map[run][level].size; 

  611.     }

  612.     else { 

  613. 	size = (level < DV_VLC_MAP_LEV_SIZE) ? dv_vlc_map[0][level].size : 16;

  614. 	if (run) {

  615. 	    size += (run < 16) ? dv_vlc_map[run-1][0].size : 13;

  616. 	}

  617.     }

  618.     return size;

  619. }

  620. #else

  621. static always_inline int dv_rl2vlc(int run, int l, uint32_t* vlc)

  622. {

  623.     *vlc = dv_vlc_map[run][((uint16_t)l)&0x1ff].vlc;

  624.     return dv_vlc_map[run][((uint16_t)l)&0x1ff].size;

  625. }

  626. 

  627. static always_inline int dv_rl2vlc_size(int run, int l)

  628. {

  629.     return dv_vlc_map[run][((uint16_t)l)&0x1ff].size;

  630. }

  631. #endif

  632. 

  633. typedef struct EncBlockInfo {

  634.     int area_q[4];

  635.     int bit_size[4];

  636.     int prev_run[4];

  637.     int cur_ac;

  638.     int cno;

  639.     int dct_mode;

  640.     DCTELEM *mb;

  641.     uint8_t partial_bit_count;

  642.     uint32_t partial_bit_buffer; /* we can't use uint16_t here */

  643. } EncBlockInfo;

  644. 

  645. static always_inline int dv_bits_left(PutBitContext* s)

  646. {

  647.     return (s->buf_end - s->buf) * 8 - 

  648.            ((s->buf_ptr - s->buf) * 8 + 32 - (int64_t)s->bit_left);

  649. }

  650. 

  651. static always_inline void dv_encode_ac(EncBlockInfo* bi, PutBitContext* pb_pool, 

  652.                                        int pb_size)

  653. {

  654.     int run;

  655.     int bits_left;

  656.     PutBitContext* pb = pb_pool;

  657.     int size = bi->partial_bit_count;

  658.     uint32_t vlc = bi->partial_bit_buffer;

  659.     

  660.     bi->partial_bit_count = bi->partial_bit_buffer = 0;

  661. vlc_loop:

  662.        /* Find suitable storage space */

  663.        for (; size > (bits_left = dv_bits_left(pb)); pb++) {

  664.           if (bits_left) {

  665.               size -= bits_left;

  666. 	      put_bits(pb, bits_left, vlc >> size);

  667. 	      vlc = vlc & ((1<<size)-1);

  668. 	  }

  669. 	  if (pb_size == 1) {

  670. 	      bi->partial_bit_count = size;

  671. 	      bi->partial_bit_buffer = vlc;

  672. 	      return;

  673. 	  }

  674. 	  --pb_size;

  675.        }

  676.        

  677.        /* Store VLC */

  678.        put_bits(pb, size, vlc);

  679.        

  680.        /* Construct the next VLC */

  681.        run = 0;

  682.        for (; bi->cur_ac < 64; bi->cur_ac++, run++) {

  683.            if (bi->mb[bi->cur_ac]) {

  684. 	       size = dv_rl2vlc(run, bi->mb[bi->cur_ac], &vlc);

  685. 	       bi->cur_ac++;

  686. 	       goto vlc_loop;

  687. 	   }

  688.        }

  689.    

  690.        if (bi->cur_ac == 64) {

  691.            size = 4; vlc = 6; /* End Of Block stamp */

  692. 	   bi->cur_ac++;

  693. 	   goto vlc_loop;

  694.        }

  695. }

  696. 

  697. static always_inline void dv_set_class_number(DCTELEM* blk, EncBlockInfo* bi, 

  698.                                               const uint8_t* zigzag_scan, int bias)

  699. {

  700.     int i, area;

  701.     int run;

  702.     int classes[] = {12, 24, 36, 0xffff};

  703. 

  704.     run = 0;

  705.     bi->mb[0] = blk[0]; 

  706.     bi->cno = 0;

  707.     for (area = 0; area < 4; area++) {

  708.        bi->prev_run[area] = run;

  709.        bi->bit_size[area] = 0;

  710.        for (i=mb_area_start[area]; i<mb_area_start[area+1]; i++) {

  711.           bi->mb[i] = (blk[zigzag_scan[i]] / 16);

  712.           while ((bi->mb[i] ^ (bi->mb[i] >> 8)) > classes[bi->cno])

  713.               bi->cno++;

  714.        

  715.           if (bi->mb[i]) {

  716.               bi->bit_size[area] += dv_rl2vlc_size(run, bi->mb[i]);

  717. 	      run = 0;

  718.           } else

  719.               ++run;

  720.        }

  721.     }

  722.     bi->bit_size[3] += 4; /* EOB marker */

  723.     bi->cno += bias;

  724.     

  725.     if (bi->cno >= 3) { /* FIXME: we have to recreate bit_size[], prev_run[] */

  726.         bi->cno = 3;

  727. 	for (i=1; i<64; i++)

  728. 	   bi->mb[i] /= 2;

  729.     }

  730. }

  731. 

  732. #define SC(x, y) ((s[x] - s[y]) ^ ((s[x] - s[y]) >> 7))

  733. static always_inline int dv_guess_dct_mode(DCTELEM *blk) {

  734.     DCTELEM *s;

  735.     int score88 = 0;

  736.     int score248 = 0;

  737.     int i;

  738.     

  739.     /* Compute 8-8 score (small values give a better chance for 8-8 DCT) */

  740.     s = blk;

  741.     for(i=0; i<7; i++) {

  742.         score88 += SC(0,  8) + SC(1, 9) + SC(2, 10) + SC(3, 11) + 

  743. 	           SC(4, 12) + SC(5,13) + SC(6, 14) + SC(7, 15);

  744.         s += 8;

  745.     }

  746.     /* Compute 2-4-8 score (small values give a better chance for 2-4-8 DCT) */

  747.     s = blk;

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

  749.         score248 += SC(0, 16) + SC(1,17) + SC(2, 18) + SC(3, 19) +

  750. 	            SC(4, 20) + SC(5,21) + SC(6, 22) + SC(7, 23);

  751.         s += 8;

  752.     }

  753. 

  754.     return (score88 - score248 > -10);

  755. }

  756. 

  757. static inline void dv_guess_qnos(EncBlockInfo* blks, int* qnos)

  758. {

  759.     int size[5];

  760.     int i, j, k, a, run;

  761.     EncBlockInfo* b;

  762.     

  763.     do {

  764.        b = blks;

  765.        for (i=0; i<5; i++) {

  766.           if (!qnos[i])

  767. 	      continue;

  768. 	  

  769. 	  qnos[i]--;

  770. 	  size[i] = 0;

  771.           for (j=0; j<6; j++, b++) {

  772. 	     for (a=0; a<4; a++) {

  773. 	        if (b->area_q[a] != dv_quant_shifts[qnos[i] + dv_quant_offset[b->cno]][a]) {

  774. 		    b->bit_size[a] = (a==3)?4:0;

  775. 		    b->area_q[a]++;

  776. 		    run = b->prev_run[a];

  777. 		    for (k=mb_area_start[a]; k<mb_area_start[a+1]; k++) {

  778. 		       b->mb[k] /= 2;

  779. 		       if (b->mb[k]) {

  780.                            b->bit_size[a] += dv_rl2vlc_size(run, b->mb[k]);

  781. 	                   run = 0;

  782.                        } else

  783.                            ++run;

  784. 		    }

  785. 		}

  786. 		size[i] += b->bit_size[a];

  787. 	     }

  788. 	  }

  789.        }

  790.     } while ((vs_total_ac_bits < size[0] + size[1] + size[2] + size[3] + size[4]) && 

  791.              (qnos[0]|qnos[1]|qnos[2]|qnos[3]|qnos[4]));

  792. }

  793. 

  794. /*

  795.  * This is a very rough initial implementaion. The performance is

  796.  * horrible and the weighting is missing. But it's missing from the 

  797.  * decoding step also -- so at least we're on the same page with decoder ;-)

  798.  */

  799. static inline void dv_encode_video_segment(DVVideoDecodeContext *s, 

  800.                                            uint8_t *dif, 

  801.                                            const uint16_t *mb_pos_ptr)

  802. {

  803.     int mb_index, i, j, v;

  804.     int mb_x, mb_y, c_offset, linesize; 

  805.     uint8_t*  y_ptr;

  806.     uint8_t*  data;

  807.     uint8_t*  ptr;

  808.     int       do_edge_wrap;

  809.     DCTELEM   block[64] __align8;

  810.     EncBlockInfo  enc_blks[5*6];

  811.     PutBitContext pbs[5*6];

  812.     PutBitContext* pb; 

  813.     EncBlockInfo* enc_blk;

  814.     int       vs_bit_size = 0;

  815.     int       qnos[5];

  816.    

  817.     enc_blk = &enc_blks[0];

  818.     pb = &pbs[0];

  819.     for(mb_index = 0; mb_index < 5; mb_index++) {

  820.         v = *mb_pos_ptr++;

  821.         mb_x = v & 0xff;

  822.         mb_y = v >> 8;

  823.         y_ptr = s->picture.data[0] + (mb_y * s->picture.linesize[0] * 8) + (mb_x * 8);

  824. 	c_offset = (s->sys->pix_fmt == PIX_FMT_YUV411P) ?

  825. 	           ((mb_y * s->picture.linesize[1] * 8) + ((mb_x >> 2) * 8)) :

  826. 		   (((mb_y >> 1) * s->picture.linesize[1] * 8) + ((mb_x >> 1) * 8));

  827. 	do_edge_wrap = 0;

  828. 	qnos[mb_index] = 15; /* No quantization */

  829.         ptr = dif + mb_index*80 + 4;

  830.         for(j = 0;j < 6; j++) {

  831.             if (j < 4) {  /* Four Y blocks */

  832. 		/* NOTE: at end of line, the macroblock is handled as 420 */

  833. 		if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x < (704 / 8)) {

  834.                     data = y_ptr + (j * 8);

  835.                 } else {

  836.                     data = y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->picture.linesize[0]);

  837.                 }

  838. 		linesize = s->picture.linesize[0];

  839.             } else {      /* Cr and Cb blocks */

  840. 	        /* don't ask Fabrice why they inverted Cb and Cr ! */

  841. 	        data = s->picture.data[6 - j] + c_offset;

  842. 		linesize = s->picture.linesize[6 - j];

  843. 		if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8))

  844. 		    do_edge_wrap = 1;

  845. 	    }	

  846.             

  847. 	    /* Everything is set up -- now just copy data -> DCT block */

  848. 	    if (do_edge_wrap) {  /* Edge wrap copy: 4x16 -> 8x8 */

  849. 		uint8_t* d;

  850. 		DCTELEM *b = block;

  851. 	        for (i=0;i<8;i++) {

  852. 		   d = data + 8 * linesize;

  853. 		   b[0] = data[0]; b[1] = data[1]; b[2] = data[2]; b[3] = data[3];

  854.                    b[4] =    d[0]; b[5] =    d[1]; b[6] =    d[2]; b[7] =    d[3];

  855. 		   data += linesize;

  856. 		   b += 8;

  857. 		}

  858. 	    } else {             /* Simple copy: 8x8 -> 8x8 */

  859. 	        s->get_pixels(block, data, linesize);

  860. 	    }

  861. 	  

  862.             enc_blk->dct_mode = dv_guess_dct_mode(block);

  863. 	    enc_blk->mb = &s->block[mb_index*6+j][0];

  864. 	    enc_blk->area_q[0] = enc_blk->area_q[1] = enc_blk->area_q[2] = enc_blk->area_q[3] = 0;

  865. 	    enc_blk->partial_bit_count = 0;

  866. 	    enc_blk->partial_bit_buffer = 0;

  867. 	    enc_blk->cur_ac = 1;

  868. 	    

  869. 	    s->fdct[enc_blk->dct_mode](block);

  870. 	    

  871. 	    dv_set_class_number(block, enc_blk, 

  872. 	                        enc_blk->dct_mode ? ff_zigzag248_direct : ff_zigzag_direct,

  873. 				j/4*(j%2));

  874.            

  875.             init_put_bits(pb, ptr, block_sizes[j]/8);

  876. 	    put_bits(pb, 9, (uint16_t)(((enc_blk->mb[0] >> 3) - 1024) >> 2));

  877. 	    put_bits(pb, 1, enc_blk->dct_mode);

  878. 	    put_bits(pb, 2, enc_blk->cno);

  879. 	    

  880. 	    vs_bit_size += enc_blk->bit_size[0] + enc_blk->bit_size[1] +

  881. 	                   enc_blk->bit_size[2] + enc_blk->bit_size[3];

  882. 	    ++enc_blk;

  883. 	    ++pb;

  884. 	    ptr += block_sizes[j]/8;

  885.         }

  886.     }

  887. 

  888.     if (vs_total_ac_bits < vs_bit_size)

  889.         dv_guess_qnos(&enc_blks[0], &qnos[0]);

  890. 

  891.     for (i=0; i<5; i++) {

  892.        dif[i*80 + 3] = qnos[i];

  893.     }

  894. 

  895.     /* First pass over individual cells only */

  896.     for (j=0; j<5*6; j++)

  897.        dv_encode_ac(&enc_blks[j], &pbs[j], 1);

  898. 

  899.     /* Second pass over each MB space */

  900.     for (j=0; j<5*6; j++) {

  901.        if (enc_blks[j].cur_ac < 65 || enc_blks[j].partial_bit_count)

  902.            dv_encode_ac(&enc_blks[j], &pbs[(j/6)*6], 6);

  903.     }

  904. 

  905.     /* Third and final pass over the whole vides segment space */

  906.     for (j=0; j<5*6; j++) {

  907.        if (enc_blks[j].cur_ac < 65 || enc_blks[j].partial_bit_count)

  908.            dv_encode_ac(&enc_blks[j], &pbs[0], 6*5);

  909.     }

  910. 

  911.     for (j=0; j<5*6; j++)

  912.        flush_put_bits(&pbs[j]);

  913. }

  914. 

  915. /* NOTE: exactly one frame must be given (120000 bytes for NTSC,

  916.    144000 bytes for PAL) */

  917. static int dvvideo_decode_frame(AVCodecContext *avctx, 

  918.                                  void *data, int *data_size,

  919.                                  uint8_t *buf, int buf_size)

  920. {

  921.     DVVideoDecodeContext *s = avctx->priv_data;

  922.     int ds, vs;

  923.     const uint16_t *mb_pos_ptr;

  924.     

  925.     s->sys = dv_frame_profile(buf);

  926.     if (!s->sys || buf_size < s->sys->frame_size)

  927.         return -1; /* NOTE: we only accept several full frames */

  928. 

  929. 	

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

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

  932.     

  933.     s->picture.reference = 0;

  934.     avctx->pix_fmt = s->sys->pix_fmt;

  935.     avctx->width = s->sys->width;

  936.     avctx->height = s->sys->height;

  937.     if(avctx->get_buffer(avctx, &s->picture) < 0) {

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

  939.         return -1;

  940.     }

  941.     s->picture.interlaced_frame = 1;

  942.     s->picture.top_field_first = 0;

  943. 

  944.     /* for each DIF segment */

  945.     mb_pos_ptr = s->sys->video_place;

  946.     for (ds = 0; ds < s->sys->difseg_size; ds++) {

  947.         buf += 6 * 80; /* skip DIF segment header */

  948.         

  949.         for(vs = 0; vs < 27; vs++) {

  950.             if ((vs % 3) == 0)

  951. 	        buf += 80; /* skip audio block */

  952.             

  953. #ifdef VLC_DEBUG

  954.             printf("********************* %d, %d **********************\n", ds, vs);

  955. #endif

  956. 	    dv_decode_video_segment(s, buf, mb_pos_ptr);

  957.             buf += 5 * 80;

  958.             mb_pos_ptr += 5;

  959.         }

  960.     }

  961. 

  962.     emms_c();

  963. 

  964.     /* return image */

  965.     *data_size = sizeof(AVFrame);

  966.     *(AVFrame*)data= s->picture;

  967.     

  968.     return s->sys->frame_size;

  969. }

  970. 

  971. static int dvvideo_encode_frame(AVCodecContext *c, uint8_t *buf, int buf_size, 

  972.                                 void *data)

  973. {

  974.     DVVideoDecodeContext *s = c->priv_data;

  975.     const uint16_t *mb_pos_ptr;

  976.     int ds, vs;

  977. 

  978.     s->sys = dv_codec_profile(c);

  979.     if (!s->sys)

  980. 	return -1;

  981.     

  982.     c->pix_fmt = s->sys->pix_fmt;

  983.     s->picture = *((AVFrame *)data);

  984. 

  985.     /* for each DIF segment */

  986.     mb_pos_ptr = s->sys->video_place;

  987.     for (ds = 0; ds < s->sys->difseg_size; ds++) {

  988.         buf += 6 * 80; /* skip DIF segment header */

  989.         

  990.         for(vs = 0; vs < 27; vs++) {

  991.             if ((vs % 3) == 0)

  992. 	        buf += 80; /* skip audio block */

  993. 

  994. #ifdef VLC_DEBUG

  995.             printf("********************* %d, %d **********************\n", ds, vs);

  996. #endif

  997. 	    dv_encode_video_segment(s, buf, mb_pos_ptr);

  998.             buf += 5 * 80;

  999.             mb_pos_ptr += 5;

  1000.         }

  1001.     }

  1002. 

  1003.     emms_c();

  1004.     return s->sys->frame_size;

  1005. }

  1006. 

  1007. static int dvvideo_end(AVCodecContext *avctx)

  1008. {

  1009.     avcodec_default_free_buffers(avctx);    

  1010.     return 0;

  1011. }

  1012. 

  1013. AVCodec dvvideo_decoder = {

  1014.     "dvvideo",

  1015.     CODEC_TYPE_VIDEO,

  1016.     CODEC_ID_DVVIDEO,

  1017.     sizeof(DVVideoDecodeContext),

  1018.     dvvideo_init,

  1019.     dvvideo_encode_frame,

  1020.     dvvideo_end,

  1021.     dvvideo_decode_frame,

  1022.     CODEC_CAP_DR1,

  1023.     NULL

  1024. };