1 #if !defined(_FX_JPEG_TURBO_) 2 /* 3 * jcmarker.c 4 * 5 * Copyright (C) 1991-1998, Thomas G. Lane. 6 * This file is part of the Independent JPEG Group's software. 7 * For conditions of distribution and use, see the accompanying README file. 8 * 9 * This file contains routines to write JPEG datastream markers. 10 */ 11 12 #define JPEG_INTERNALS 13 #include "jinclude.h" 14 #include "jpeglib.h" 15 16 17 typedef enum { /* JPEG marker codes */ 18 M_SOF0 = 0xc0, 19 M_SOF1 = 0xc1, 20 M_SOF2 = 0xc2, 21 M_SOF3 = 0xc3, 22 23 M_SOF5 = 0xc5, 24 M_SOF6 = 0xc6, 25 M_SOF7 = 0xc7, 26 27 M_JPG = 0xc8, 28 M_SOF9 = 0xc9, 29 M_SOF10 = 0xca, 30 M_SOF11 = 0xcb, 31 32 M_SOF13 = 0xcd, 33 M_SOF14 = 0xce, 34 M_SOF15 = 0xcf, 35 36 M_DHT = 0xc4, 37 38 M_DAC = 0xcc, 39 40 M_RST0 = 0xd0, 41 M_RST1 = 0xd1, 42 M_RST2 = 0xd2, 43 M_RST3 = 0xd3, 44 M_RST4 = 0xd4, 45 M_RST5 = 0xd5, 46 M_RST6 = 0xd6, 47 M_RST7 = 0xd7, 48 49 M_SOI = 0xd8, 50 M_EOI = 0xd9, 51 M_SOS = 0xda, 52 M_DQT = 0xdb, 53 M_DNL = 0xdc, 54 M_DRI = 0xdd, 55 M_DHP = 0xde, 56 M_EXP = 0xdf, 57 58 M_APP0 = 0xe0, 59 M_APP1 = 0xe1, 60 M_APP2 = 0xe2, 61 M_APP3 = 0xe3, 62 M_APP4 = 0xe4, 63 M_APP5 = 0xe5, 64 M_APP6 = 0xe6, 65 M_APP7 = 0xe7, 66 M_APP8 = 0xe8, 67 M_APP9 = 0xe9, 68 M_APP10 = 0xea, 69 M_APP11 = 0xeb, 70 M_APP12 = 0xec, 71 M_APP13 = 0xed, 72 M_APP14 = 0xee, 73 M_APP15 = 0xef, 74 75 M_JPG0 = 0xf0, 76 M_JPG13 = 0xfd, 77 M_COM = 0xfe, 78 79 M_TEM = 0x01, 80 81 M_ERROR = 0x100 82 } JPEG_MARKER; 83 84 85 /* Private state */ 86 87 typedef struct { 88 struct jpeg_marker_writer pub; /* public fields */ 89 90 unsigned int last_restart_interval; /* last DRI value emitted; 0 after SOI */ 91 } my_marker_writer; 92 93 typedef my_marker_writer * my_marker_ptr; 94 95 96 /* 97 * Basic output routines. 98 * 99 * Note that we do not support suspension while writing a marker. 100 * Therefore, an application using suspension must ensure that there is 101 * enough buffer space for the initial markers (typ. 600-700 bytes) before 102 * calling jpeg_start_compress, and enough space to write the trailing EOI 103 * (a few bytes) before calling jpeg_finish_compress. Multipass compression 104 * modes are not supported at all with suspension, so those two are the only 105 * points where markers will be written. 106 */ 107 108 LOCAL(void) 109 emit_byte (j_compress_ptr cinfo, int val) 110 /* Emit a byte */ 111 { 112 struct jpeg_destination_mgr * dest = cinfo->dest; 113 114 *(dest->next_output_byte)++ = (JOCTET) val; 115 if (--dest->free_in_buffer == 0) { 116 if (! (*dest->empty_output_buffer) (cinfo)) 117 ERREXIT(cinfo, JERR_CANT_SUSPEND); 118 } 119 } 120 121 122 LOCAL(void) 123 emit_marker (j_compress_ptr cinfo, JPEG_MARKER mark) 124 /* Emit a marker code */ 125 { 126 emit_byte(cinfo, 0xFF); 127 emit_byte(cinfo, (int) mark); 128 } 129 130 131 LOCAL(void) 132 emit_2bytes (j_compress_ptr cinfo, int value) 133 /* Emit a 2-byte integer; these are always MSB first in JPEG files */ 134 { 135 emit_byte(cinfo, (value >> 8) & 0xFF); 136 emit_byte(cinfo, value & 0xFF); 137 } 138 139 140 /* 141 * Routines to write specific marker types. 142 */ 143 144 LOCAL(int) 145 emit_dqt (j_compress_ptr cinfo, int index) 146 /* Emit a DQT marker */ 147 /* Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking */ 148 { 149 JQUANT_TBL * qtbl = cinfo->quant_tbl_ptrs[index]; 150 int prec; 151 int i; 152 153 if (qtbl == NULL) 154 ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index); 155 156 prec = 0; 157 for (i = 0; i < DCTSIZE2; i++) { 158 if (qtbl->quantval[i] > 255) 159 prec = 1; 160 } 161 162 if (! qtbl->sent_table) { 163 emit_marker(cinfo, M_DQT); 164 165 emit_2bytes(cinfo, prec ? DCTSIZE2*2 + 1 + 2 : DCTSIZE2 + 1 + 2); 166 167 emit_byte(cinfo, index + (prec<<4)); 168 169 for (i = 0; i < DCTSIZE2; i++) { 170 /* The table entries must be emitted in zigzag order. */ 171 unsigned int qval = qtbl->quantval[jpeg_natural_order[i]]; 172 if (prec) 173 emit_byte(cinfo, (int) (qval >> 8)); 174 emit_byte(cinfo, (int) (qval & 0xFF)); 175 } 176 177 qtbl->sent_table = TRUE; 178 } 179 180 return prec; 181 } 182 183 184 LOCAL(void) 185 emit_dht (j_compress_ptr cinfo, int index, boolean is_ac) 186 /* Emit a DHT marker */ 187 { 188 JHUFF_TBL * htbl; 189 int length, i; 190 191 if (is_ac) { 192 htbl = cinfo->ac_huff_tbl_ptrs[index]; 193 index += 0x10; /* output index has AC bit set */ 194 } else { 195 htbl = cinfo->dc_huff_tbl_ptrs[index]; 196 } 197 198 if (htbl == NULL) 199 ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, index); 200 201 if (! htbl->sent_table) { 202 emit_marker(cinfo, M_DHT); 203 204 length = 0; 205 for (i = 1; i <= 16; i++) 206 length += htbl->bits[i]; 207 208 emit_2bytes(cinfo, length + 2 + 1 + 16); 209 emit_byte(cinfo, index); 210 211 for (i = 1; i <= 16; i++) 212 emit_byte(cinfo, htbl->bits[i]); 213 214 for (i = 0; i < length; i++) 215 emit_byte(cinfo, htbl->huffval[i]); 216 217 htbl->sent_table = TRUE; 218 } 219 } 220 221 222 LOCAL(void) 223 emit_dac (j_compress_ptr cinfo) 224 /* Emit a DAC marker */ 225 /* Since the useful info is so small, we want to emit all the tables in */ 226 /* one DAC marker. Therefore this routine does its own scan of the table. */ 227 { 228 #ifdef C_ARITH_CODING_SUPPORTED 229 char dc_in_use[NUM_ARITH_TBLS]; 230 char ac_in_use[NUM_ARITH_TBLS]; 231 int length, i; 232 jpeg_component_info *compptr; 233 234 for (i = 0; i < NUM_ARITH_TBLS; i++) 235 dc_in_use[i] = ac_in_use[i] = 0; 236 237 for (i = 0; i < cinfo->comps_in_scan; i++) { 238 compptr = cinfo->cur_comp_info[i]; 239 dc_in_use[compptr->dc_tbl_no] = 1; 240 ac_in_use[compptr->ac_tbl_no] = 1; 241 } 242 243 length = 0; 244 for (i = 0; i < NUM_ARITH_TBLS; i++) 245 length += dc_in_use[i] + ac_in_use[i]; 246 247 emit_marker(cinfo, M_DAC); 248 249 emit_2bytes(cinfo, length*2 + 2); 250 251 for (i = 0; i < NUM_ARITH_TBLS; i++) { 252 if (dc_in_use[i]) { 253 emit_byte(cinfo, i); 254 emit_byte(cinfo, cinfo->arith_dc_L[i] + (cinfo->arith_dc_U[i]<<4)); 255 } 256 if (ac_in_use[i]) { 257 emit_byte(cinfo, i + 0x10); 258 emit_byte(cinfo, cinfo->arith_ac_K[i]); 259 } 260 } 261 #endif /* C_ARITH_CODING_SUPPORTED */ 262 } 263 264 265 LOCAL(void) 266 emit_dri (j_compress_ptr cinfo) 267 /* Emit a DRI marker */ 268 { 269 emit_marker(cinfo, M_DRI); 270 271 emit_2bytes(cinfo, 4); /* fixed length */ 272 273 emit_2bytes(cinfo, (int) cinfo->restart_interval); 274 } 275 276 277 LOCAL(void) 278 emit_sof (j_compress_ptr cinfo, JPEG_MARKER code) 279 /* Emit a SOF marker */ 280 { 281 int ci; 282 jpeg_component_info *compptr; 283 284 emit_marker(cinfo, code); 285 286 emit_2bytes(cinfo, 3 * cinfo->num_components + 2 + 5 + 1); /* length */ 287 288 /* Make sure image isn't bigger than SOF field can handle */ 289 if ((long) cinfo->image_height > 65535L || 290 (long) cinfo->image_width > 65535L) 291 ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) 65535); 292 293 emit_byte(cinfo, cinfo->data_precision); 294 emit_2bytes(cinfo, (int) cinfo->image_height); 295 emit_2bytes(cinfo, (int) cinfo->image_width); 296 297 emit_byte(cinfo, cinfo->num_components); 298 299 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 300 ci++, compptr++) { 301 emit_byte(cinfo, compptr->component_id); 302 emit_byte(cinfo, (compptr->h_samp_factor << 4) + compptr->v_samp_factor); 303 emit_byte(cinfo, compptr->quant_tbl_no); 304 } 305 } 306 307 308 LOCAL(void) 309 emit_sos (j_compress_ptr cinfo) 310 /* Emit a SOS marker */ 311 { 312 int i, td, ta; 313 jpeg_component_info *compptr; 314 315 emit_marker(cinfo, M_SOS); 316 317 emit_2bytes(cinfo, 2 * cinfo->comps_in_scan + 2 + 1 + 3); /* length */ 318 319 emit_byte(cinfo, cinfo->comps_in_scan); 320 321 for (i = 0; i < cinfo->comps_in_scan; i++) { 322 compptr = cinfo->cur_comp_info[i]; 323 emit_byte(cinfo, compptr->component_id); 324 td = compptr->dc_tbl_no; 325 ta = compptr->ac_tbl_no; 326 if (cinfo->progressive_mode) { 327 /* Progressive mode: only DC or only AC tables are used in one scan; 328 * furthermore, Huffman coding of DC refinement uses no table at all. 329 * We emit 0 for unused field(s); this is recommended by the P&M text 330 * but does not seem to be specified in the standard. 331 */ 332 if (cinfo->Ss == 0) { 333 ta = 0; /* DC scan */ 334 if (cinfo->Ah != 0 && !cinfo->arith_code) 335 td = 0; /* no DC table either */ 336 } else { 337 td = 0; /* AC scan */ 338 } 339 } 340 emit_byte(cinfo, (td << 4) + ta); 341 } 342 343 emit_byte(cinfo, cinfo->Ss); 344 emit_byte(cinfo, cinfo->Se); 345 emit_byte(cinfo, (cinfo->Ah << 4) + cinfo->Al); 346 } 347 348 349 LOCAL(void) 350 emit_jfif_app0 (j_compress_ptr cinfo) 351 /* Emit a JFIF-compliant APP0 marker */ 352 { 353 /* 354 * Length of APP0 block (2 bytes) 355 * Block ID (4 bytes - ASCII "JFIF") 356 * Zero byte (1 byte to terminate the ID string) 357 * Version Major, Minor (2 bytes - major first) 358 * Units (1 byte - 0x00 = none, 0x01 = inch, 0x02 = cm) 359 * Xdpu (2 bytes - dots per unit horizontal) 360 * Ydpu (2 bytes - dots per unit vertical) 361 * Thumbnail X size (1 byte) 362 * Thumbnail Y size (1 byte) 363 */ 364 365 emit_marker(cinfo, M_APP0); 366 367 emit_2bytes(cinfo, 2 + 4 + 1 + 2 + 1 + 2 + 2 + 1 + 1); /* length */ 368 369 emit_byte(cinfo, 0x4A); /* Identifier: ASCII "JFIF" */ 370 emit_byte(cinfo, 0x46); 371 emit_byte(cinfo, 0x49); 372 emit_byte(cinfo, 0x46); 373 emit_byte(cinfo, 0); 374 emit_byte(cinfo, cinfo->JFIF_major_version); /* Version fields */ 375 emit_byte(cinfo, cinfo->JFIF_minor_version); 376 emit_byte(cinfo, cinfo->density_unit); /* Pixel size information */ 377 emit_2bytes(cinfo, (int) cinfo->X_density); 378 emit_2bytes(cinfo, (int) cinfo->Y_density); 379 emit_byte(cinfo, 0); /* No thumbnail image */ 380 emit_byte(cinfo, 0); 381 } 382 383 384 LOCAL(void) 385 emit_adobe_app14 (j_compress_ptr cinfo) 386 /* Emit an Adobe APP14 marker */ 387 { 388 /* 389 * Length of APP14 block (2 bytes) 390 * Block ID (5 bytes - ASCII "Adobe") 391 * Version Number (2 bytes - currently 100) 392 * Flags0 (2 bytes - currently 0) 393 * Flags1 (2 bytes - currently 0) 394 * Color transform (1 byte) 395 * 396 * Although Adobe TN 5116 mentions Version = 101, all the Adobe files 397 * now in circulation seem to use Version = 100, so that's what we write. 398 * 399 * We write the color transform byte as 1 if the JPEG color space is 400 * YCbCr, 2 if it's YCCK, 0 otherwise. Adobe's definition has to do with 401 * whether the encoder performed a transformation, which is pretty useless. 402 */ 403 404 emit_marker(cinfo, M_APP14); 405 406 emit_2bytes(cinfo, 2 + 5 + 2 + 2 + 2 + 1); /* length */ 407 408 emit_byte(cinfo, 0x41); /* Identifier: ASCII "Adobe" */ 409 emit_byte(cinfo, 0x64); 410 emit_byte(cinfo, 0x6F); 411 emit_byte(cinfo, 0x62); 412 emit_byte(cinfo, 0x65); 413 emit_2bytes(cinfo, 100); /* Version */ 414 emit_2bytes(cinfo, 0); /* Flags0 */ 415 emit_2bytes(cinfo, 0); /* Flags1 */ 416 switch (cinfo->jpeg_color_space) { 417 case JCS_YCbCr: 418 emit_byte(cinfo, 1); /* Color transform = 1 */ 419 break; 420 case JCS_YCCK: 421 emit_byte(cinfo, 2); /* Color transform = 2 */ 422 break; 423 default: 424 emit_byte(cinfo, 0); /* Color transform = 0 */ 425 break; 426 } 427 } 428 429 430 /* 431 * These routines allow writing an arbitrary marker with parameters. 432 * The only intended use is to emit COM or APPn markers after calling 433 * write_file_header and before calling write_frame_header. 434 * Other uses are not guaranteed to produce desirable results. 435 * Counting the parameter bytes properly is the caller's responsibility. 436 */ 437 438 METHODDEF(void) 439 write_marker_header (j_compress_ptr cinfo, int marker, unsigned int datalen) 440 /* Emit an arbitrary marker header */ 441 { 442 if (datalen > (unsigned int) 65533) /* safety check */ 443 ERREXIT(cinfo, JERR_BAD_LENGTH); 444 445 emit_marker(cinfo, (JPEG_MARKER) marker); 446 447 emit_2bytes(cinfo, (int) (datalen + 2)); /* total length */ 448 } 449 450 METHODDEF(void) 451 write_marker_byte (j_compress_ptr cinfo, int val) 452 /* Emit one byte of marker parameters following write_marker_header */ 453 { 454 emit_byte(cinfo, val); 455 } 456 457 458 /* 459 * Write datastream header. 460 * This consists of an SOI and optional APPn markers. 461 * We recommend use of the JFIF marker, but not the Adobe marker, 462 * when using YCbCr or grayscale data. The JFIF marker should NOT 463 * be used for any other JPEG colorspace. The Adobe marker is helpful 464 * to distinguish RGB, CMYK, and YCCK colorspaces. 465 * Note that an application can write additional header markers after 466 * jpeg_start_compress returns. 467 */ 468 469 METHODDEF(void) 470 write_file_header (j_compress_ptr cinfo) 471 { 472 my_marker_ptr marker = (my_marker_ptr) cinfo->marker; 473 474 emit_marker(cinfo, M_SOI); /* first the SOI */ 475 476 /* SOI is defined to reset restart interval to 0 */ 477 marker->last_restart_interval = 0; 478 479 if (cinfo->write_JFIF_header) /* next an optional JFIF APP0 */ 480 emit_jfif_app0(cinfo); 481 if (cinfo->write_Adobe_marker) /* next an optional Adobe APP14 */ 482 emit_adobe_app14(cinfo); 483 } 484 485 486 /* 487 * Write frame header. 488 * This consists of DQT and SOFn markers. 489 * Note that we do not emit the SOF until we have emitted the DQT(s). 490 * This avoids compatibility problems with incorrect implementations that 491 * try to error-check the quant table numbers as soon as they see the SOF. 492 */ 493 494 METHODDEF(void) 495 write_frame_header (j_compress_ptr cinfo) 496 { 497 int ci, prec; 498 boolean is_baseline; 499 jpeg_component_info *compptr; 500 501 /* Emit DQT for each quantization table. 502 * Note that emit_dqt() suppresses any duplicate tables. 503 */ 504 prec = 0; 505 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 506 ci++, compptr++) { 507 prec += emit_dqt(cinfo, compptr->quant_tbl_no); 508 } 509 /* now prec is nonzero iff there are any 16-bit quant tables. */ 510 511 /* Check for a non-baseline specification. 512 * Note we assume that Huffman table numbers won't be changed later. 513 */ 514 if (cinfo->arith_code || cinfo->progressive_mode || 515 cinfo->data_precision != 8) { 516 is_baseline = FALSE; 517 } else { 518 is_baseline = TRUE; 519 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 520 ci++, compptr++) { 521 if (compptr->dc_tbl_no > 1 || compptr->ac_tbl_no > 1) 522 is_baseline = FALSE; 523 } 524 if (prec && is_baseline) { 525 is_baseline = FALSE; 526 /* If it's baseline except for quantizer size, warn the user */ 527 TRACEMS(cinfo, 0, JTRC_16BIT_TABLES); 528 } 529 } 530 531 /* Emit the proper SOF marker */ 532 if (cinfo->arith_code) { 533 emit_sof(cinfo, M_SOF9); /* SOF code for arithmetic coding */ 534 } else { 535 if (cinfo->progressive_mode) 536 emit_sof(cinfo, M_SOF2); /* SOF code for progressive Huffman */ 537 else if (is_baseline) 538 emit_sof(cinfo, M_SOF0); /* SOF code for baseline implementation */ 539 else 540 emit_sof(cinfo, M_SOF1); /* SOF code for non-baseline Huffman file */ 541 } 542 } 543 544 545 /* 546 * Write scan header. 547 * This consists of DHT or DAC markers, optional DRI, and SOS. 548 * Compressed data will be written following the SOS. 549 */ 550 551 METHODDEF(void) 552 write_scan_header (j_compress_ptr cinfo) 553 { 554 my_marker_ptr marker = (my_marker_ptr) cinfo->marker; 555 int i; 556 jpeg_component_info *compptr; 557 558 if (cinfo->arith_code) { 559 /* Emit arith conditioning info. We may have some duplication 560 * if the file has multiple scans, but it's so small it's hardly 561 * worth worrying about. 562 */ 563 emit_dac(cinfo); 564 } else { 565 /* Emit Huffman tables. 566 * Note that emit_dht() suppresses any duplicate tables. 567 */ 568 for (i = 0; i < cinfo->comps_in_scan; i++) { 569 compptr = cinfo->cur_comp_info[i]; 570 if (cinfo->progressive_mode) { 571 /* Progressive mode: only DC or only AC tables are used in one scan */ 572 if (cinfo->Ss == 0) { 573 if (cinfo->Ah == 0) /* DC needs no table for refinement scan */ 574 emit_dht(cinfo, compptr->dc_tbl_no, FALSE); 575 } else { 576 emit_dht(cinfo, compptr->ac_tbl_no, TRUE); 577 } 578 } else { 579 /* Sequential mode: need both DC and AC tables */ 580 emit_dht(cinfo, compptr->dc_tbl_no, FALSE); 581 emit_dht(cinfo, compptr->ac_tbl_no, TRUE); 582 } 583 } 584 } 585 586 /* Emit DRI if required --- note that DRI value could change for each scan. 587 * We avoid wasting space with unnecessary DRIs, however. 588 */ 589 if (cinfo->restart_interval != marker->last_restart_interval) { 590 emit_dri(cinfo); 591 marker->last_restart_interval = cinfo->restart_interval; 592 } 593 594 emit_sos(cinfo); 595 } 596 597 598 /* 599 * Write datastream trailer. 600 */ 601 602 METHODDEF(void) 603 write_file_trailer (j_compress_ptr cinfo) 604 { 605 emit_marker(cinfo, M_EOI); 606 } 607 608 609 /* 610 * Write an abbreviated table-specification datastream. 611 * This consists of SOI, DQT and DHT tables, and EOI. 612 * Any table that is defined and not marked sent_table = TRUE will be 613 * emitted. Note that all tables will be marked sent_table = TRUE at exit. 614 */ 615 616 METHODDEF(void) 617 write_tables_only (j_compress_ptr cinfo) 618 { 619 int i; 620 621 emit_marker(cinfo, M_SOI); 622 623 for (i = 0; i < NUM_QUANT_TBLS; i++) { 624 if (cinfo->quant_tbl_ptrs[i] != NULL) 625 (void) emit_dqt(cinfo, i); 626 } 627 628 if (! cinfo->arith_code) { 629 for (i = 0; i < NUM_HUFF_TBLS; i++) { 630 if (cinfo->dc_huff_tbl_ptrs[i] != NULL) 631 emit_dht(cinfo, i, FALSE); 632 if (cinfo->ac_huff_tbl_ptrs[i] != NULL) 633 emit_dht(cinfo, i, TRUE); 634 } 635 } 636 637 emit_marker(cinfo, M_EOI); 638 } 639 640 641 /* 642 * Initialize the marker writer module. 643 */ 644 645 GLOBAL(void) 646 jinit_marker_writer (j_compress_ptr cinfo) 647 { 648 my_marker_ptr marker; 649 650 /* Create the subobject */ 651 marker = (my_marker_ptr) 652 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 653 SIZEOF(my_marker_writer)); 654 cinfo->marker = (struct jpeg_marker_writer *) marker; 655 /* Initialize method pointers */ 656 marker->pub.write_file_header = write_file_header; 657 marker->pub.write_frame_header = write_frame_header; 658 marker->pub.write_scan_header = write_scan_header; 659 marker->pub.write_file_trailer = write_file_trailer; 660 marker->pub.write_tables_only = write_tables_only; 661 marker->pub.write_marker_header = write_marker_header; 662 marker->pub.write_marker_byte = write_marker_byte; 663 /* Initialize private state */ 664 marker->last_restart_interval = 0; 665 } 666 667 #endif //_FX_JPEG_TURBO_ 668
