jpc_qmfb.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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 */

/*
 * Quadrature Mirror-Image Filter Bank (QMFB) Library
 *
 * $Id$
 */

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

#include <assert.h>

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

#include "jpc_qmfb.h"
#include "jpc_tsfb.h"
#include "jpc_math.h"

/******************************************************************************\
*
\******************************************************************************/

static jpc_qmfb1d_t *jpc_qmfb1d_create(void);

static int jpc_ft_getnumchans(jpc_qmfb1d_t *qmfb);
static int jpc_ft_getanalfilters(jpc_qmfb1d_t *qmfb, int len, jas_seq2d_t **filters);
static int jpc_ft_getsynfilters(jpc_qmfb1d_t *qmfb, int len, jas_seq2d_t **filters);
static void jpc_ft_analyze(jpc_qmfb1d_t *qmfb, int flags, jas_seq2d_t *x);
static void jpc_ft_synthesize(jpc_qmfb1d_t *qmfb, int flags, jas_seq2d_t *x);

static int jpc_ns_getnumchans(jpc_qmfb1d_t *qmfb);
static int jpc_ns_getanalfilters(jpc_qmfb1d_t *qmfb, int len, jas_seq2d_t **filters);
static int jpc_ns_getsynfilters(jpc_qmfb1d_t *qmfb, int len, jas_seq2d_t **filters);
static void jpc_ns_analyze(jpc_qmfb1d_t *qmfb, int flags, jas_seq2d_t *x);
static void jpc_ns_synthesize(jpc_qmfb1d_t *qmfb, int flags, jas_seq2d_t *x);

/******************************************************************************\
*
\******************************************************************************/

jpc_qmfb1dops_t jpc_ft_ops = {
	jpc_ft_getnumchans,
	jpc_ft_getanalfilters,
	jpc_ft_getsynfilters,
	jpc_ft_analyze,
	jpc_ft_synthesize
};

jpc_qmfb1dops_t jpc_ns_ops = {
	jpc_ns_getnumchans,
	jpc_ns_getanalfilters,
	jpc_ns_getsynfilters,
	jpc_ns_analyze,
	jpc_ns_synthesize
};

/******************************************************************************\
*
\******************************************************************************/

static void jpc_qmfb1d_setup(jpc_fix_t *startptr, int startind, int endind,
  int intrastep, jpc_fix_t **lstartptr, int *lstartind, int *lendind,
  jpc_fix_t **hstartptr, int *hstartind, int *hendind)
{
	*lstartind = JPC_CEILDIVPOW2(startind, 1);
	*lendind = JPC_CEILDIVPOW2(endind, 1);
	*hstartind = JPC_FLOORDIVPOW2(startind, 1);
	*hendind = JPC_FLOORDIVPOW2(endind, 1);
	*lstartptr = startptr;
	*hstartptr = &startptr[(*lendind - *lstartind) * intrastep];
}

static void jpc_qmfb1d_split(jpc_fix_t *startptr, int startind, int endind,
  register int step, jpc_fix_t *lstartptr, int lstartind, int lendind,
  jpc_fix_t *hstartptr, int hstartind, int hendind)
{
	int bufsize = JPC_CEILDIVPOW2(endind - startind, 2);
#if defined(WIN32)
#define QMFB_SPLITBUFSIZE 4096
	jpc_fix_t splitbuf[QMFB_SPLITBUFSIZE];
#else
	jpc_fix_t splitbuf[bufsize];
#endif
	jpc_fix_t *buf = splitbuf;
	int llen;
	int hlen;
	int twostep;
	jpc_fix_t *tmpptr;
	register jpc_fix_t *ptr;
	register jpc_fix_t *hptr;
	register jpc_fix_t *lptr;
	register int n;
	int state;

	twostep = step << 1;
	llen = lendind - lstartind;
	hlen = hendind - hstartind;

#if defined(WIN32)
	/* Get a buffer. */
	if (bufsize > QMFB_SPLITBUFSIZE) {
		if (!(buf = jas_malloc(bufsize * sizeof(jpc_fix_t)))) {
			/* We have no choice but to commit suicide in this case. */
			abort();
		}
	}
#endif

	if (hstartind < lstartind) {
		/* The first sample in the input signal is to appear
		  in the highpass subband signal. */
		/* Copy the appropriate samples into the lowpass subband
		  signal, saving any samples destined for the highpass subband
		  signal as they are overwritten. */
		tmpptr = buf;
		ptr = &startptr[step];
		lptr = lstartptr;
		n = llen;
		state = 1;
		while (n-- > 0) {
			if (state) {
				*tmpptr = *lptr;
				++tmpptr;
			}
			*lptr = *ptr;
			ptr += twostep;
			lptr += step;
			state ^= 1;
		}
		/* Copy the appropriate samples into the highpass subband
		  signal. */
		/* Handle the nonoverwritten samples. */
		hptr = &hstartptr[(hlen - 1) * step];
		ptr = &startptr[(((llen + hlen - 1) >> 1) << 1) * step];
		n = hlen - (tmpptr - buf);
		while (n-- > 0) {
			*hptr = *ptr;
			hptr -= step;
			ptr -= twostep;
		}
		/* Handle the overwritten samples. */
		n = tmpptr - buf;
		while (n-- > 0) {
			--tmpptr;
			*hptr = *tmpptr;
			hptr -= step;
		}
	} else {
		/* The first sample in the input signal is to appear
		  in the lowpass subband signal. */
		/* Copy the appropriate samples into the lowpass subband
		  signal, saving any samples for the highpass subband
		  signal as they are overwritten. */
		state = 0;
		ptr = startptr;
		lptr = lstartptr;
		tmpptr = buf;
		n = llen;
		while (n-- > 0) {
			if (state) {
				*tmpptr = *lptr;
				++tmpptr;
			}
			*lptr = *ptr;
			ptr += twostep;
			lptr += step;
			state ^= 1;
		}
		/* Copy the appropriate samples into the highpass subband
		  signal. */
		/* Handle the nonoverwritten samples. */
		ptr = &startptr[((((llen + hlen) >> 1) << 1) - 1) * step];
		hptr = &hstartptr[(hlen - 1) * step];
		n = hlen - (tmpptr - buf);
		while (n-- > 0) {
			*hptr = *ptr;
			ptr -= twostep;
			hptr -= step;
		}
		/* Handle the overwritten samples. */
		n = tmpptr - buf;
		while (n-- > 0) {
			--tmpptr;
			*hptr = *tmpptr;
			hptr -= step;
		}
	}

#if defined(WIN32)
	/* If the split buffer was allocated on the heap, free this memory. */
	if (buf != splitbuf) {
		jas_free(buf);
	}
#endif
}

static void jpc_qmfb1d_join(jpc_fix_t *startptr, int startind, int endind,
  register int step, jpc_fix_t *lstartptr, int lstartind, int lendind,
  jpc_fix_t *hstartptr, int hstartind, int hendind)
{
	int bufsize = JPC_CEILDIVPOW2(endind - startind, 2);
#if defined(WIN32)
#define	QMFB_JOINBUFSIZE	4096
	jpc_fix_t joinbuf[QMFB_JOINBUFSIZE];
#else
	jpc_fix_t joinbuf[bufsize];
#endif
	jpc_fix_t *buf = joinbuf;
	int llen;
	int hlen;
	int twostep;
	jpc_fix_t *tmpptr;
	register jpc_fix_t *ptr;
	register jpc_fix_t *hptr;
	register jpc_fix_t *lptr;
	register int n;
	int state;

#if defined(WIN32)
	/* Allocate memory for the join buffer from the heap. */
	if (bufsize > QMFB_JOINBUFSIZE) {
		if (!(buf = jas_malloc(bufsize * sizeof(jpc_fix_t)))) {
			/* We have no choice but to commit suicide. */
			abort();
		}
	}
#endif

	twostep = step << 1;
	llen = lendind - lstartind;
	hlen = hendind - hstartind;

	if (hstartind < lstartind) {
		/* The first sample in the highpass subband signal is to
		  appear first in the output signal. */
		/* Copy the appropriate samples into the first phase of the
		  output signal. */
		tmpptr = buf;
		hptr = hstartptr;
		ptr = startptr;
		n = (llen + 1) >> 1;
		while (n-- > 0) {
			*tmpptr = *ptr;
			*ptr = *hptr;
			++tmpptr;
			ptr += twostep;
			hptr += step;
		}
		n = hlen - ((llen + 1) >> 1);
		while (n-- > 0) {
			*ptr = *hptr;
			ptr += twostep;
			hptr += step;
		}
		/* Copy the appropriate samples into the second phase of
		  the output signal. */
		ptr -= (lendind > hendind) ? (step) : (step + twostep);
		state = !((llen - 1) & 1);
		lptr = &lstartptr[(llen - 1) * step];
		n = llen;
		while (n-- > 0) {
			if (state) {
				--tmpptr;
				*ptr = *tmpptr;
			} else {
				*ptr = *lptr;
			}
			lptr -= step;
			ptr -= twostep;
			state ^= 1;
		}
	} else {
		/* The first sample in the lowpass subband signal is to
		  appear first in the output signal. */
		/* Copy the appropriate samples into the first phase of the
		  output signal (corresponding to even indexed samples). */
		lptr = &lstartptr[(llen - 1) * step];