jp2_enc.c

用C语言实现的JPEG编码

/*
 * Copyright (c) 1999-2000 Image Power, Inc. and the University of
 *   British Columbia.
 * Copyright (c) 2001-2003 Michael David Adams.
 * All rights reserved.
 */

/* __START_OF_JASPER_LICENSE__
 * 
 * JasPer Software License
 * 
 * IMAGE POWER JPEG-2000 PUBLIC LICENSE
 * ************************************
 * 
 * GRANT:
 * 
 * Permission is hereby granted, free of charge, to any person (the "User")
 * obtaining a copy of this software and associated documentation, to deal
 * in the JasPer Software without restriction, including without limitation
 * the right to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the JasPer Software (in source and binary forms),
 * and to permit persons to whom the JasPer Software is furnished to do so,
 * provided further that the License Conditions below are met.
 * 
 * License Conditions
 * ******************
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 * A.  Redistributions of source code must retain the above copyright notice,
 * and this list of conditions, and the following disclaimer.
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 * B.  Redistributions in binary form must reproduce the above copyright
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 * C.  Neither the name of Image Power, Inc. nor any other contributor
 * (including, but not limited to, the University of British Columbia and
 * Michael David Adams) may be used to endorse or promote products derived
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 * D.  User agrees that it shall not commence any action against Image Power,
 * Inc., the University of British Columbia, Michael David Adams, or any
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 * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE.
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 * INITIAL DEVELOPER, THE UNIVERSITY OF BRITISH COLUMBIA, IMAGE POWER, INC.,
 * MICHAEL DAVID ADAMS, ANY OTHER CONTRIBUTOR, OR ANY DISTRIBUTOR OF THE
 * JASPER SOFTWARE, OR ANY SUPPLIER OF ANY OF SUCH PARTIES, BE LIABLE TO
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 * CUSTOMERS AND END-USERS OF ITS PRODUCTS ARE PROVIDED WITH A COPY OF THE
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 * __END_OF_JASPER_LICENSE__
 */

/*
 * JP2 Library
 *
 * $Id$
 */

/******************************************************************************\
* Includes.
\******************************************************************************/

#include <assert.h>
#include "jasper/jas_malloc.h"
#include "jasper/jas_image.h"
#include "jasper/jas_stream.h"
#include "jasper/jas_cm.h"
#include "jasper/jas_icc.h"
#include "jp2_cod.h"

static uint_fast32_t jp2_gettypeasoc(int colorspace, int ctype);
static int clrspctojp2(jas_clrspc_t clrspc);

/******************************************************************************\
* Functions.
\******************************************************************************/

int jp2_write_header(jas_image_t *image, jas_stream_t *out)
{
	jp2_box_t *box;
	jp2_ftyp_t *ftyp;
	jp2_ihdr_t *ihdr;
	jas_stream_t *tmpstream;
	int allcmptssame;
	jp2_bpcc_t *bpcc;
	long len;
	uint_fast16_t cmptno;
	jp2_colr_t *colr;
	jp2_cdefchan_t *cdefchanent;
	jp2_cdef_t *cdef;
	int i;
	uint_fast32_t typeasoc;
jas_iccprof_t *iccprof;
jas_stream_t *iccstream;
int pos;
int needcdef;
int prec;
int sgnd;

	box = 0;
	tmpstream = 0;

	allcmptssame = 1;
	sgnd = jas_image_cmptsgnd(image, 0);
	prec = jas_image_cmptprec(image, 0);
	for (i = 1; i < jas_image_numcmpts(image); ++i) {
		if (jas_image_cmptsgnd(image, i) != sgnd ||
		  jas_image_cmptprec(image, i) != prec) {
			allcmptssame = 0;
			break;
		}
	}

	/* Output the signature box. */

	if (!(box = jp2_box_create(JP2_BOX_JP))) {
		goto error;
	}
	box->data.jp.magic = JP2_JP_MAGIC;
	if (jp2_box_put(box, out)) {
		goto error;
	}
	jp2_box_destroy(box);
	box = 0;

	/* Output the file type box. */

	if (!(box = jp2_box_create(JP2_BOX_FTYP))) {
		goto error;
	}
	ftyp = &box->data.ftyp;
	ftyp->majver = JP2_FTYP_MAJVER;
	ftyp->minver = JP2_FTYP_MINVER;
	ftyp->numcompatcodes = 1;
	ftyp->compatcodes[0] = JP2_FTYP_COMPATCODE;
	if (jp2_box_put(box, out)) {
		goto error;
	}
	jp2_box_destroy(box);
	box = 0;

	/*
	 * Generate the data portion of the JP2 header box.
	 * We cannot simply output the header for this box
	 * since we do not yet know the correct value for the length
	 * field.
	 */

	if (!(tmpstream = jas_stream_memopen(0, 0))) {
		goto error;
	}

	/* Generate image header box. */

	if (!(box = jp2_box_create(JP2_BOX_IHDR))) {
		goto error;
	}
	ihdr = &box->data.ihdr;
	ihdr->width = jas_image_width(image);
	ihdr->height = jas_image_height(image);
	ihdr->numcmpts = jas_image_numcmpts(image);
	ihdr->bpc = allcmptssame ? JP2_SPTOBPC(jas_image_cmptsgnd(image, 0),
	  jas_image_cmptprec(image, 0)) : JP2_IHDR_BPCNULL;
	ihdr->comptype = JP2_IHDR_COMPTYPE;
	ihdr->csunk = 0;
	ihdr->ipr = 0;
	if (jp2_box_put(box, tmpstream)) {
		goto error;
	}
	jp2_box_destroy(box);
	box = 0;

	/* Generate bits per component box. */

	if (!allcmptssame) {
		if (!(box = jp2_box_create(JP2_BOX_BPCC))) {
			goto error;
		}
		bpcc = &box->data.bpcc;
		bpcc->numcmpts = jas_image_numcmpts(image);
		if (!(bpcc->bpcs = jas_malloc(bpcc->numcmpts *
		  sizeof(uint_fast8_t)))) {
			goto error;
		}
		for (cmptno = 0; cmptno < bpcc->numcmpts; ++cmptno) {
			bpcc->bpcs[cmptno] = JP2_SPTOBPC(jas_image_cmptsgnd(image,
			  cmptno), jas_image_cmptprec(image, cmptno));
		}
		if (jp2_box_put(box, tmpstream)) {
			goto error;
		}
		jp2_box_destroy(box);
		box = 0;
	}

	/* Generate color specification box. */

	if (!(box = jp2_box_create(JP2_BOX_COLR))) {
		goto error;
	}
	colr = &box->data.colr;
	switch (jas_image_clrspc(image)) {
	case JAS_CLRSPC_SRGB: