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.
3330 Commits
32 Branches
677MB
Tree: d890d4aed1
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'd890d4aed1'
${ noResults }
FFmpeg/libavcodec/dv.c

975 lines
29KB
Raw Blame History 

  1. /*

  2.  * DV decoder

  3.  * Copyright (c) 2002 Fabrice Bellard.

  4.  * Copyright (c) 2004 Roman Shaposhnik.

  5.  *

  6.  * DV encoder 

  7.  * Copyright (c) 2003 Roman Shaposhnik.

  8.  *

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

  10.  * of DV technical info.

  11.  *

  12.  * This library is free software; you can redistribute it and/or

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

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

  15.  * version 2 of the License, or (at your option) any later version.

  16.  *

  17.  * This library is distributed in the hope that it will be useful,

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

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

  20.  * Lesser General Public License for more details.

  21.  *

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

  23.  * License along with this library; if not, write to the Free Software

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

  25.  */

  26. 

  27. /**

  28.  * @file dv.c

  29.  * DV codec.

  30.  */

  31. #include "avcodec.h"

  32. #include "dsputil.h"

  33. #include "mpegvideo.h"

  34. #include "simple_idct.h"

  35. #include "dvdata.h"

  36. 

  37. typedef struct DVVideoContext {

  38.     const DVprofile* sys;

  39.     AVFrame picture;

  40.     uint8_t *buf;

  41.     

  42.     uint8_t dv_zigzag[2][64];

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

  44.   

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

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

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

  48. } DVVideoContext;

  49. 

  50. #define TEX_VLC_BITS 9

  51. 

  52. #ifdef DV_CODEC_TINY_TARGET

  53. #define DV_VLC_MAP_RUN_SIZE 15

  54. #define DV_VLC_MAP_LEV_SIZE 23

  55. #else

  56. #define DV_VLC_MAP_RUN_SIZE  64 

  57. #define DV_VLC_MAP_LEV_SIZE 512

  58. #endif

  59. 

  60. /* MultiThreading */

  61. static uint8_t** dv_anchor;

  62. 

  63. /* XXX: also include quantization */

  64. static RL_VLC_ELEM *dv_rl_vlc;

  65. /* VLC encoding lookup table */

  66. static struct dv_vlc_pair {

  67.    uint32_t vlc;

  68.    uint8_t  size;

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

  70. 

  71. static void dv_build_unquantize_tables(DVVideoContext *s, uint8_t* perm)

  72. {

  73.     int i, q, j;

  74. 

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

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

  77.         /* 88DCT */

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

  79.             /* 88 table */

  80.             j = perm[i];

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

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

  83. 	    s->dv_idct_shift[1][0][q][j] = s->dv_idct_shift[0][0][q][j] + 1;

  84.         }

  85.         

  86.         /* 248DCT */

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

  88.             /* 248 table */

  89.             s->dv_idct_shift[0][1][q][i] =  

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

  91. 	    s->dv_idct_shift[1][1][q][i] = s->dv_idct_shift[0][1][q][i] + 1;

  92.         }

  93.     }

  94. }

  95. 

  96. static int dvvideo_init(AVCodecContext *avctx)

  97. {

  98.     DVVideoContext *s = avctx->priv_data;

  99.     DSPContext dsp;

  100.     static int done=0;

  101.     int i, j;

  102. 

  103.     if (!done) {

  104.         VLC dv_vlc;

  105.         uint16_t new_dv_vlc_bits[NB_DV_VLC*2];

  106.         uint8_t new_dv_vlc_len[NB_DV_VLC*2];

  107.         uint8_t new_dv_vlc_run[NB_DV_VLC*2];

  108.         int16_t new_dv_vlc_level[NB_DV_VLC*2];

  109. 

  110.         done = 1;

  111. 

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

  113. 	if (!dv_vlc_map)

  114. 	    return -ENOMEM;

  115. 

  116. 	/* dv_anchor lets each thread know its Id */

  117. 	dv_anchor = av_malloc(12*27*sizeof(void*));

  118. 	if (!dv_anchor) {

  119. 	    av_free(dv_vlc_map);

  120. 	    return -ENOMEM;

  121. 	}

  122. 	for (i=0; i<12*27; i++)

  123. 	    dv_anchor[i] = (void*)(size_t)i;

  124. 

  125. 	/* it's faster to include sign bit in a generic VLC parsing scheme */

  126. 	for (i=0, j=0; i<NB_DV_VLC; i++, j++) {

  127. 	    new_dv_vlc_bits[j] = dv_vlc_bits[i];

  128. 	    new_dv_vlc_len[j] = dv_vlc_len[i];

  129. 	    new_dv_vlc_run[j] = dv_vlc_run[i];

  130. 	    new_dv_vlc_level[j] = dv_vlc_level[i];

  131. 	    

  132. 	    if (dv_vlc_level[i]) {

  133. 	        new_dv_vlc_bits[j] <<= 1;

  134. 		new_dv_vlc_len[j]++;

  135. 

  136. 		j++;

  137. 		new_dv_vlc_bits[j] = (dv_vlc_bits[i] << 1) | 1;

  138. 		new_dv_vlc_len[j] = dv_vlc_len[i] + 1;

  139. 		new_dv_vlc_run[j] = dv_vlc_run[i];

  140. 		new_dv_vlc_level[j] = -dv_vlc_level[i];

  141. 	    }

  142. 	}

  143.              

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

  145.            to accelerate the parsing of partial codes */

  146.         init_vlc(&dv_vlc, TEX_VLC_BITS, j, 

  147.                  new_dv_vlc_len, 1, 1, new_dv_vlc_bits, 2, 2);

  148. 

  149.         dv_rl_vlc = av_malloc(dv_vlc.table_size * sizeof(RL_VLC_ELEM));

  150. 	if (!dv_rl_vlc) {

  151. 	    av_free(dv_anchor);

  152. 	    av_free(dv_vlc_map);

  153. 	    return -ENOMEM;

  154. 	}

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

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

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

  158.             int level, run;

  159.         

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

  161.                 run= 0;

  162.                 level= code;

  163.             } else {

  164.                 run=   new_dv_vlc_run[code] + 1;

  165.                 level= new_dv_vlc_level[code];

  166.             }

  167.             dv_rl_vlc[i].len = len;

  168.             dv_rl_vlc[i].level = level;

  169.             dv_rl_vlc[i].run = run;

  170.         }

  171. 	free_vlc(&dv_vlc);

  172. 

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

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

  175. 	       continue;

  176. 	   

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

  178. 	       continue;

  179. 	       

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

  181. 	                                                    (!!dv_vlc_level[i]);

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

  183. 	                                                     (!!dv_vlc_level[i]);

  184. 	}

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

  186. #ifdef DV_CODEC_TINY_TARGET

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

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

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

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

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

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

  193. 	      }

  194. 	   }

  195. #else

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

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

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

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

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

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

  202. 	      }

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

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

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

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

  207. 	   }

  208. #endif

  209. 	}

  210.     }

  211. 

  212.     /* Generic DSP setup */

  213.     dsputil_init(&dsp, avctx);

  214.     s->get_pixels = dsp.get_pixels;

  215. 

  216.     /* 88DCT setup */

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

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

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

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

  221. 

  222.     /* 248DCT setup */

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

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

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

  226. 

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

  228.     dv_build_unquantize_tables(s, dsp.idct_permutation);

  229. 

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

  231.     if (dv_codec_profile(avctx))

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

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

  234.     

  235.     return 0;

  236. }

  237. 

  238. static int dvvideo_end(AVCodecContext *avctx)

  239. {

  240.     avcodec_default_free_buffers(avctx);    

  241.     return 0;

  242. }

  243. 

  244. // #define VLC_DEBUG

  245. // #define printf(...) av_log(NULL, AV_LOG_ERROR, __VA_ARGS__)

  246. 

  247. typedef struct BlockInfo {

  248.     const uint8_t *shift_table;

  249.     const uint8_t *scan_table;

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

  251.     uint8_t dct_mode;

  252.     uint8_t partial_bit_count;

  253.     uint16_t partial_bit_buffer;

  254.     int shift_offset;

  255. } BlockInfo;

  256. 

  257. /* block size in bits */

  258. static const uint16_t block_sizes[6] = {

  259.     112, 112, 112, 112, 80, 80

  260. };

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

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

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

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

  265. 

  266. #ifndef ALT_BITSTREAM_READER

  267. #warning only works with ALT_BITSTREAM_READER

  268. #endif

  269. 

  270. static inline int get_bits_left(GetBitContext *s)

  271. {

  272.     return s->size_in_bits - get_bits_count(s);

  273. }

  274. 

  275. static inline int get_bits_size(GetBitContext *s)

  276. {

  277.     return s->size_in_bits;

  278. }

  279. 

  280. static inline int put_bits_left(PutBitContext* s)

  281. {

  282.     return (s->buf_end - s->buf) * 8 - put_bits_count(s);

  283. }

  284. 

  285. /* decode ac coefs */

  286. static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, DCTELEM *block)

  287. {

  288.     int last_index = get_bits_size(gb);

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

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

  291.     int pos = mb->pos;

  292.     int partial_bit_count = mb->partial_bit_count;

  293.     int level, pos1, run, vlc_len, index;

  294.     

  295.     OPEN_READER(re, gb);

  296.     UPDATE_CACHE(re, gb);

  297.     

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

  299.     if (partial_bit_count > 0) {

  300.         re_cache = ((unsigned)re_cache >> partial_bit_count) |

  301. 	           (mb->partial_bit_buffer << (sizeof(re_cache)*8 - partial_bit_count));

  302. 	re_index -= partial_bit_count;

  303. 	mb->partial_bit_count = 0;

  304.     }

  305. 

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

  307.     for(;;) {

  308. #ifdef VLC_DEBUG

  309.         printf("%2d: bits=%04x index=%d\n", pos, SHOW_UBITS(re, gb, 16), re_index);

  310. #endif

  311.         /* our own optimized GET_RL_VLC */

  312.         index = NEG_USR32(re_cache, TEX_VLC_BITS);

  313. 	vlc_len = dv_rl_vlc[index].len;

  314.         if (vlc_len < 0) {

  315.             index = NEG_USR32((unsigned)re_cache << TEX_VLC_BITS, -vlc_len) + dv_rl_vlc[index].level;

  316.             vlc_len = TEX_VLC_BITS - vlc_len;

  317.         }

  318.         level = dv_rl_vlc[index].level;

  319. 	run = dv_rl_vlc[index].run;

  320. 	

  321. 	/* gotta check if we're still within gb boundaries */

  322. 	if (re_index + vlc_len > last_index) {

  323. 	    /* should be < 16 bits otherwise a codeword could have been parsed */

  324. 	    mb->partial_bit_count = last_index - re_index;

  325. 	    mb->partial_bit_buffer = NEG_USR32(re_cache, mb->partial_bit_count);

  326. 	    re_index = last_index;

  327. 	    break;

  328. 	}

  329. 	re_index += vlc_len;

  330. 

  331. #ifdef VLC_DEBUG

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

  333. #endif

  334. 	pos += run; 	

  335. 	if (pos >= 64)

  336. 	    break;

  337.         

  338. 	if (level) {

  339.             pos1 = scan_table[pos];

  340.             block[pos1] = level << shift_table[pos1];

  341.         } 

  342. 

  343.         UPDATE_CACHE(re, gb);

  344.     }

  345.     CLOSE_READER(re, gb);

  346.     mb->pos = pos;

  347. }

  348. 

  349. static inline void bit_copy(PutBitContext *pb, GetBitContext *gb)

  350. {

  351.     int bits_left = get_bits_left(gb);

  352.     while (bits_left >= 16) {

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

  354.         bits_left -= 16;

  355.     }

  356.     if (bits_left > 0) {

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

  358.     }

  359. }

  360. 

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

  362. static inline void dv_decode_video_segment(DVVideoContext *s, 

  363.                                            uint8_t *buf_ptr1, 

  364.                                            const uint16_t *mb_pos_ptr)

  365. {

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

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

  368.     DCTELEM *block, *block1;

  369.     int c_offset;

  370.     uint8_t *y_ptr;

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

  372.     uint8_t *buf_ptr;

  373.     PutBitContext pb, vs_pb;

  374.     GetBitContext gb;

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

  376.     DCTELEM sblock[5*6][64] __align8;

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

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

  379. 	    

  380.     memset(sblock, 0, sizeof(sblock));

  381. 

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

  383.     buf_ptr = buf_ptr1;

  384.     block1 = &sblock[0][0];

  385.     mb1 = mb_data;

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

  387.     for(mb_index = 0; mb_index < 5; mb_index++, mb1 += 6, block1 += 6 * 64) {

  388.         /* skip header */

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

  390.         buf_ptr += 4;

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

  392.         mb = mb1;

  393.         block = block1;

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

  395.             last_index = block_sizes[j];

  396. 	    init_get_bits(&gb, buf_ptr, last_index);

  397.             

  398.             /* get the dc */

  399.             dc = get_bits(&gb, 9);

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

  401.             dct_mode = get_bits1(&gb);

  402.             mb->dct_mode = dct_mode;

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

  404.             class1 = get_bits(&gb, 2);

  405.             mb->shift_table = s->dv_idct_shift[class1 == 3][dct_mode]

  406.                 [quant + dv_quant_offset[class1]];

  407.             dc = dc << 2;

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

  409.                standard IDCT */

  410.             dc += 1024;

  411.             block[0] = dc;

  412.             buf_ptr += last_index >> 3;

  413.             mb->pos = 0;

  414.             mb->partial_bit_count = 0;

  415. 

  416. #ifdef VLC_DEBUG

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

  418. #endif

  419.             dv_decode_ac(&gb, mb, block);

  420. 

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

  422.                block is finished */

  423.             if (mb->pos >= 64)

  424.                 bit_copy(&pb, &gb);

  425.             

  426.             block += 64;

  427.             mb++;

  428.         }

  429.         

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

  431. #ifdef VLC_DEBUG

  432.         printf("***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index);

  433. #endif

  434.         block = block1;

  435.         mb = mb1;

  436.         init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb));

  437. 	flush_put_bits(&pb);

  438.         for(j = 0;j < 6; j++, block += 64, mb++) {

  439.             if (mb->pos < 64 && get_bits_left(&gb) > 0) {

  440.                 dv_decode_ac(&gb, mb, block);

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

  442.                 if (mb->pos < 64)

  443.                     break;

  444.             }

  445.         }

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

  447.            the video segment level */

  448.         if (j >= 6)

  449. 	    bit_copy(&vs_pb, &gb);

  450.     }

  451. 

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

  453. #ifdef VLC_DEBUG

  454.     printf("***pass 3 size=%d\n", put_bits_count(&vs_pb));

  455. #endif

  456.     block = &sblock[0][0];

  457.     mb = mb_data;

  458.     init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb));

  459.     flush_put_bits(&vs_pb);

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

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

  462.             if (mb->pos < 64) {

  463. #ifdef VLC_DEBUG

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

  465. #endif

  466.                 dv_decode_ac(&gb, mb, block);

  467.             }

  468. 	    if (mb->pos >= 64 && mb->pos < 127)

  469. 		av_log(NULL, AV_LOG_ERROR, "AC EOB marker is absent pos=%d\n", mb->pos);

  470.             block += 64;

  471.             mb++;

  472.         }

  473.     }

  474.     

  475.     /* compute idct and place blocks */

  476.     block = &sblock[0][0];

  477.     mb = mb_data;

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

  479.         v = *mb_pos_ptr++;

  480.         mb_x = v & 0xff;

  481.         mb_y = v >> 8;

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

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

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

  485.         else

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

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

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

  489.             if (j < 4) {

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

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

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

  493.                 } else {

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

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

  496.                 }

  497.             } else {

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

  499.                     uint64_t aligned_pixels[64/8];

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

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

  502.                     int y, linesize;

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

  504.                     idct_put(pixels, 8, block);

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

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

  507.                     ptr = pixels;

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

  509.                         /* convert to 411P */

  510.                         c_ptr1 = c_ptr + 8*linesize;

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

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

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

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

  515.                         c_ptr += linesize;

  516.                         ptr += 8;

  517.                     }

  518.                 } else {

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

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

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

  522.                 }

  523.             }

  524.             block += 64;

  525.             mb++;

  526.         }

  527.     }

  528. }

  529. 

  530. #ifdef DV_CODEC_TINY_TARGET

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

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

  533. {

  534.     int sign = l >> 8;

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

  536.     int size;

  537.     

  538.     sign = (sign & 1);

  539. 

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

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

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

  543.     }

  544.     else { 

  545.         if (level < DV_VLC_MAP_LEV_SIZE) {

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

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

  548. 	} else {

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

  550. 	    size = 16;

  551. 	}

  552. 	if (run) {

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

  554. 	                          (0x1f80 | (run - 1))) << size;

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

  556. 	}

  557.     }

  558.     

  559.     return size;

  560. }

  561. 

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

  563. {

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

  565.     int size;

  566.     

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

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

  569.     }

  570.     else { 

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

  572. 	if (run) {

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

  574. 	}

  575.     }

  576.     return size;

  577. }

  578. #else

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

  580. {

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

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

  583. }

  584. 

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

  586. {

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

  588. }

  589. #endif

  590. 

  591. typedef struct EncBlockInfo {

  592.     int area_q[4];

  593.     int bit_size[4];

  594.     int prev_run[4];

  595.     int cur_ac;

  596.     int cno;

  597.     int dct_mode;

  598.     DCTELEM *mb;

  599.     uint8_t partial_bit_count;

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

  601. } EncBlockInfo;

  602. 

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

  604.                                        int pb_size)

  605. {

  606.     int run;

  607.     int bits_left;

  608.     PutBitContext* pb = pb_pool;

  609.     int size = bi->partial_bit_count;

  610.     uint32_t vlc = bi->partial_bit_buffer;

  611.     

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

  613. vlc_loop:

  614.        /* Find suitable storage space */

  615.        for (; size > (bits_left = put_bits_left(pb)); pb++) {

  616.           if (bits_left) {

  617.               size -= bits_left;

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

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

  620. 	  }

  621. 	  if (pb_size == 1) {

  622. 	      bi->partial_bit_count = size;

  623. 	      bi->partial_bit_buffer = vlc;

  624. 	      return;

  625. 	  }

  626. 	  --pb_size;

  627.        }

  628.        

  629.        /* Store VLC */

  630.        put_bits(pb, size, vlc);

  631.        

  632.        /* Construct the next VLC */

  633.        run = 0;

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

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

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

  637. 	       bi->cur_ac++;

  638. 	       goto vlc_loop;

  639. 	   }

  640.        }

  641.    

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

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

  644. 	   bi->cur_ac++;

  645. 	   goto vlc_loop;

  646.        }

  647. }

  648. 

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

  650.                                               const uint8_t* zigzag_scan, int bias)

  651. {

  652.     int i, area;

  653.     int run;

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

  655. 

  656.     run = 0;

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

  658.     bi->cno = 0;

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

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

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

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

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

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

  665.               bi->cno++;

  666.        

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

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

  669. 	      run = 0;

  670.           } else

  671.               ++run;

  672.        }

  673.     }

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

  675.     bi->cno += bias;

  676.     

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

  678.         bi->cno = 3;

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

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

  681.     }

  682. }

  683. 

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

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

  686.     DCTELEM *s;

  687.     int score88 = 0;

  688.     int score248 = 0;

  689.     int i;

  690.     

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

  692.     s = blk;

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

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

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

  696.         s += 8;

  697.     }

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

  699.     s = blk;

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

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

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

  703.         s += 8;

  704.     }

  705. 

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

  707. }

  708. 

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

  710. {

  711.     int size[5];

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

  713.     EncBlockInfo* b;

  714.     

  715.     do {

  716.        b = blks;

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

  718.           if (!qnos[i])

  719. 	      continue;

  720. 	  

  721. 	  qnos[i]--;

  722. 	  size[i] = 0;

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

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

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

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

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

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

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

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

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

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

  733. 	                   run = 0;

  734.                        } else

  735.                            ++run;

  736. 		    }

  737. 		}

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

  739. 	     }

  740. 	  }

  741.        }

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

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

  744. }

  745. 

  746. /*

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

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

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

  750.  */

  751. static inline void dv_encode_video_segment(DVVideoContext *s, 

  752.                                            uint8_t *dif, 

  753.                                            const uint16_t *mb_pos_ptr)

  754. {

  755.     int mb_index, i, j, v;

  756.     int mb_x, mb_y, c_offset, linesize; 

  757.     uint8_t*  y_ptr;

  758.     uint8_t*  data;

  759.     uint8_t*  ptr;

  760.     int       do_edge_wrap;

  761.     DCTELEM   block[64] __align8;

  762.     DCTELEM   sblock[5*6][64] __align8;

  763.     EncBlockInfo  enc_blks[5*6];

  764.     PutBitContext pbs[5*6];

  765.     PutBitContext* pb; 

  766.     EncBlockInfo* enc_blk;

  767.     int       vs_bit_size = 0;

  768.     int       qnos[5];

  769.    

  770.     enc_blk = &enc_blks[0];

  771.     pb = &pbs[0];

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

  773.         v = *mb_pos_ptr++;

  774.         mb_x = v & 0xff;

  775.         mb_y = v >> 8;

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

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

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

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

  780. 	do_edge_wrap = 0;

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

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

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

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

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

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

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

  788.                 } else {

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

  790.                 }

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

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

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

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

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

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

  797. 		    do_edge_wrap = 1;

  798. 	    }	

  799.             

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

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

  802. 		uint8_t* d;

  803. 		DCTELEM *b = block;

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

  805. 		   d = data + 8 * linesize;

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

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

  808. 		   data += linesize;

  809. 		   b += 8;

  810. 		}

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

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

  813. 	    }

  814. 	  

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

  816. 	    enc_blk->mb = &sblock[mb_index*6+j][0];

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

  818. 	    enc_blk->partial_bit_count = 0;

  819. 	    enc_blk->partial_bit_buffer = 0;

  820. 	    enc_blk->cur_ac = 1;

  821. 	    

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

  823. 	    

  824. 	    dv_set_class_number(block, enc_blk, 

  825. 	                        enc_blk->dct_mode ? ff_zigzag248_direct : ff_zigzag_direct,

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

  827.            

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

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

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

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

  832. 	    

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

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

  835. 	    ++enc_blk;

  836. 	    ++pb;

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

  838.         }

  839.     }

  840. 

  841.     if (vs_total_ac_bits < vs_bit_size)

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

  843. 

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

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

  846.     }

  847. 

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

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

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

  851. 

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

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

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

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

  856.     }

  857. 

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

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

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

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

  862.     }

  863. 

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

  865.        flush_put_bits(&pbs[j]);

  866. }

  867. 

  868. static int dv_decode_mt(AVCodecContext *avctx, void* sl)

  869. {

  870.     DVVideoContext *s = avctx->priv_data;

  871.     int slice = (size_t)sl;

  872.     dv_decode_video_segment(s, &s->buf[((slice/27)*6+(slice/3)+slice*5+7)*80],

  873. 	                    &s->sys->video_place[slice*5]);

  874.     return 0;

  875. }

  876. 

  877. static int dv_encode_mt(AVCodecContext *avctx, void* sl)

  878. {

  879.     DVVideoContext *s = avctx->priv_data;

  880.     int slice = (size_t)sl;

  881.     dv_encode_video_segment(s, &s->buf[((slice/27)*6+(slice/3)+slice*5+7)*80],

  882. 	                    &s->sys->video_place[slice*5]);

  883.     return 0;

  884. }

  885. 

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

  887.    144000 bytes for PAL) */

  888. static int dvvideo_decode_frame(AVCodecContext *avctx, 

  889.                                  void *data, int *data_size,

  890.                                  uint8_t *buf, int buf_size)

  891. {

  892.     DVVideoContext *s = avctx->priv_data;

  893.   

  894.     *data_size=0;

  895.     /* special case for last picture */

  896.     if(buf_size==0)

  897.         return 0;

  898.     

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

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

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

  902. 

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

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

  905.     

  906.     s->picture.reference = 0;

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

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

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

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

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

  912.         return -1;

  913.     }

  914.     s->picture.interlaced_frame = 1;

  915.     s->picture.top_field_first = 0;

  916. 

  917.     s->buf = buf;

  918.     avctx->execute(avctx, dv_decode_mt, (void**)&dv_anchor[0], NULL, 

  919. 	           s->sys->difseg_size * 27);

  920.     

  921.     emms_c();

  922. 

  923.     /* return image */

  924.     *data_size = sizeof(AVFrame);

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

  926.     

  927.     return s->sys->frame_size;

  928. }

  929. 

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

  931.                                 void *data)

  932. {

  933.     DVVideoContext *s = c->priv_data;

  934. 

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

  936.     if (!s->sys)

  937. 	return -1;

  938.     

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

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

  941. 

  942.     s->buf = buf;

  943.     c->execute(c, dv_encode_mt, (void**)&dv_anchor[0], NULL, 

  944. 	       s->sys->difseg_size * 27);

  945. 

  946.     emms_c();

  947.     return s->sys->frame_size;

  948. }

  949. 

  950. AVCodec dvvideo_encoder = {

  951.     "dvvideo",

  952.     CODEC_TYPE_VIDEO,

  953.     CODEC_ID_DVVIDEO,

  954.     sizeof(DVVideoContext),

  955.     dvvideo_init,

  956.     dvvideo_encode_frame,

  957.     dvvideo_end,

  958.     NULL,

  959.     CODEC_CAP_DR1,

  960.     NULL

  961. };

  962. 

  963. AVCodec dvvideo_decoder = {

  964.     "dvvideo",

  965.     CODEC_TYPE_VIDEO,

  966.     CODEC_ID_DVVIDEO,

  967.     sizeof(DVVideoContext),

  968.     dvvideo_init,

  969.     NULL,

  970.     dvvideo_end,

  971.     dvvideo_decode_frame,

  972.     CODEC_CAP_DR1,

  973.     NULL

  974. };