jpc_t2enc.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.
 */

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 */

/*
 * Tier 2 Encoder
 *
 * $Id$
 */

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

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#include "jasper/jas_fix.h"
#include "jasper/jas_malloc.h"
#include "jasper/jas_math.h"
#include "jasper/jas_debug.h"

#include "jpc_flt.h"
#include "jpc_t2enc.h"
#include "jpc_t2cod.h"
#include "jpc_tagtree.h"
#include "jpc_enc.h"
#include "jpc_math.h"

/******************************************************************************\
* Code.
\******************************************************************************/

static int jpc_putcommacode(jpc_bitstream_t *out, int n)
{
	assert(n >= 0);

	while (--n >= 0) {
		if (jpc_bitstream_putbit(out, 1) == EOF) {
			return -1;
		}
	}
	if (jpc_bitstream_putbit(out, 0) == EOF) {
		return -1;
	}
	return 0;
}

static int jpc_putnumnewpasses(jpc_bitstream_t *out, int n)
{
	int ret;

	if (n <= 0) {
		return -1;
	} else if (n == 1) {
		ret = jpc_bitstream_putbit(out, 0);
	} else if (n == 2) {
		ret = jpc_bitstream_putbits(out, 2, 2);
	} else if (n <= 5) {
		ret = jpc_bitstream_putbits(out, 4, 0xc | (n - 3));
	} else if (n <= 36) {
		ret = jpc_bitstream_putbits(out, 9, 0x1e0 | (n - 6));
	} else if (n <= 164) {
		ret = jpc_bitstream_putbits(out, 16, 0xff80 | (n - 37));
	} else {
		/* The standard has no provision for encoding a larger value.
		In practice, however, it is highly unlikely that this
		limitation will ever be encountered. */
		return -1;
	}

	return (ret != EOF) ? 0 : (-1);
}

int jpc_enc_encpkts(jpc_enc_t *enc, jas_stream_t *out)
{
	jpc_enc_tile_t *tile;
	jpc_pi_t *pi;

	tile = enc->curtile;

	jpc_init_t2state(enc, 0);
	pi = tile->pi;
	jpc_pi_init(pi);

	if (!jpc_pi_next(pi)) {
		for (;;) {
			if (jpc_enc_encpkt(enc, out, jpc_pi_cmptno(pi), jpc_pi_rlvlno(pi),
			  jpc_pi_prcno(pi), jpc_pi_lyrno(pi))) {
				return -1;
			}
			if (jpc_pi_next(pi)) {
				break;
			}
		}
	}
	
	return 0;
}

int jpc_enc_encpkt(jpc_enc_t *enc, jas_stream_t *out, int compno, int lvlno, int prcno, int lyrno)
{
	jpc_enc_tcmpt_t *comp;
	jpc_enc_rlvl_t *lvl;
	jpc_enc_band_t *band;
	jpc_enc_band_t *endbands;
	jpc_enc_cblk_t *cblk;
	jpc_enc_cblk_t *endcblks;
	jpc_bitstream_t *outb;
	jpc_enc_pass_t *pass;
	jpc_enc_pass_t *startpass;
	jpc_enc_pass_t *lastpass;
	jpc_enc_pass_t *endpass;
	jpc_enc_pass_t *endpasses;
	int i;
	int included;
	int ret;
	jpc_tagtreenode_t *leaf;
	int n;
	int t1;
	int t2;
	int adjust;
	int maxadjust;
	int datalen;
	int numnewpasses;
	int passcount;
	jpc_enc_tile_t *tile;
	jpc_enc_prc_t *prc;
	jpc_enc_cp_t *cp;
	jpc_ms_t *ms;

	tile = enc->curtile;
	cp = enc->cp;

	if (cp->tcp.csty & JPC_COD_SOP) {
		if (!(ms = jpc_ms_create(JPC_MS_SOP))) {
			return -1;
		}
		ms->parms.sop.seqno = jpc_pi_getind(tile->pi);
		if (jpc_putms(out, enc->cstate, ms)) {
			return -1;
		}
		jpc_ms_destroy(ms);
	}

	outb = jpc_bitstream_sopen(out, "w+");
	assert(outb);

	if (jpc_bitstream_putbit(outb, 1) == EOF) {
		return -1;
	}
	JAS_DBGLOG(10, ("\n"));
	JAS_DBGLOG(10, ("present. "));

	comp = &tile->tcmpts[compno];
	lvl = &comp->rlvls[lvlno];
	endbands = &lvl->bands[lvl->numbands];
	for (band = lvl->bands; band != endbands; ++band) {
		if (!band->data) {
			continue;
		}
		prc = &band->prcs[prcno];
		if (!prc->cblks) {
			continue;
		}

		endcblks = &prc->cblks[prc->numcblks];
		for (cblk = prc->cblks; cblk != endcblks; ++cblk) {
			if (!lyrno) {
				leaf = jpc_tagtree_getleaf(prc->nlibtree, cblk - prc->cblks);
				jpc_tagtree_setvalue(prc->nlibtree, leaf, cblk->numimsbs);
			}
			pass = cblk->curpass;
			included = (pass && pass->lyrno == lyrno);
			if (included && (!cblk->numencpasses)) {
				assert(pass->lyrno == lyrno);
				leaf = jpc_tagtree_getleaf(prc->incltree,
				  cblk - prc->cblks);
				jpc_tagtree_setvalue(prc->incltree, leaf, pass->lyrno);
			}
		}

		endcblks = &prc->cblks[prc->numcblks];
		for (cblk = prc->cblks; cblk != endcblks; ++cblk) {
			pass = cblk->curpass;
			included = (pass && pass->lyrno == lyrno);
			if (!cblk->numencpasses) {
				leaf = jpc_tagtree_getleaf(prc->incltree,
				  cblk - prc->cblks);
				if (jpc_tagtree_encode(prc->incltree, leaf, lyrno
				  + 1, outb) < 0) {
					return -1;
				}
			} else {
				if (jpc_bitstream_putbit(outb, included) == EOF) {
					return -1;
				}
			}
			JAS_DBGLOG(10, ("included=%d ", included));
			if (!included) {
				continue;
			}
			if (!cblk->numencpasses) {
				i = 1;
				leaf = jpc_tagtree_getleaf(prc->nlibtree, cblk - prc->cblks);
				for (;;) {
					if ((ret = jpc_tagtree_encode(prc->nlibtree, leaf, i, outb)) < 0) {
						return -1;
					}
					if (ret) {
						break;
					}
					++i;
				}
				assert(leaf->known_ && i == leaf->value_ + 1);
			}

			endpasses = &cblk->passes[cblk->numpasses];
			startpass = pass;
			endpass = startpass;
			while (endpass != endpasses && endpass->lyrno == lyrno){
				++endpass;
			}
			numnewpasses = endpass - startpass;
			if (jpc_putnumnewpasses(outb, numnewpasses)) {
				return -1;
			}
			JAS_DBGLOG(10, ("numnewpasses=%d ", numnewpasses));

			lastpass = endpass - 1;
			n = startpass->start;
			passcount = 1;
			maxadjust = 0;
			for (pass = startpass; pass != endpass; ++pass) {
				if (pass->term || pass == lastpass) {
					datalen = pass->end - n;
					t1 = jpc_firstone(datalen) + 1;
					t2 = cblk->numlenbits + jpc_floorlog2(passcount);
					adjust = JAS_MAX(t1 - t2, 0);
					maxadjust = JAS_MAX(adjust, maxadjust);
					n += datalen;
					passcount = 1;
				} else {
					++passcount;