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Add resamp_getcnt() routine to calculate the exact number of samples
that would be consumed and produced by the sampler rate converter. Use
it to avoid partial samples that are not properly handled. Fixes
last samples of certain files causing aucat to abort.

/*	$OpenBSD: dsp.h,v 1.4 2016/06/07 06:11:32 ratchov Exp $	*/
/*
 * Copyright (c) 2012 Alexandre Ratchov <alex@caoua.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#ifndef DSP_H
#define DSP_H

#include <sys/types.h>
#include "defs.h"

/*
 * Samples are numbers in the interval [-1, 1[, note that 1, the upper
 * boundary is excluded. We represent them as signed fixed point numbers
 * of ADATA_BITS. We also assume that 2^(ADATA_BITS - 1) fits in a int.
 */
#ifndef ADATA_BITS
#define ADATA_BITS			16
#endif
#define ADATA_LE			(BYTE_ORDER == LITTLE_ENDIAN)
#define ADATA_UNIT			(1 << (ADATA_BITS - 1))

#if ADATA_BITS == 16

#define ADATA_MUL(x,y)		(((int)(x) * (int)(y)) >> (ADATA_BITS - 1))
#define ADATA_MULDIV(x,y,z)	((int)(x) * (int)(y) / (int)(z))

typedef short adata_t;

#elif ADATA_BITS == 24

#if defined(__i386__) && defined(__GNUC__)

static inline int
fp24_mul(int x, int a)
{
	int res;

	asm volatile (
		"imull	%2\n\t"
		"shrdl $23, %%edx, %%eax\n\t"
		: "=a" (res)
		: "a" (x), "r" (a)
		: "%edx"
		);
	return res;
}

static inline int
fp24_muldiv(int x, int a, int b)
{
	int res;

	asm volatile (
		"imull %2\n\t"
		"idivl %3\n\t"
		: "=a" (res)
		: "a" (x), "d" (a), "r" (b)
		);
	return res;
}

#define ADATA_MUL(x,y)		fp24_mul(x, y)
#define ADATA_MULDIV(x,y,z)	fp24_muldiv(x, y, z);

#elif defined(__amd64__) || defined(__sparc64__)

#define ADATA_MUL(x,y)		\
	((int)(((long long)(x) * (long long)(y)) >> (ADATA_BITS - 1)))
#define ADATA_MULDIV(x,y,z)	\
	((int)((long long)(x) * (long long)(y) / (long long)(z)))

#else
#error "no 24-bit code for this architecture"
#endif

typedef int adata_t;

#else
#error "only 16-bit and 24-bit precisions are supported"
#endif

/*
 * Maximum size of the encording string (the longest possible
 * encoding is ``s24le3msb'').
 */
#define ENCMAX	10

/*
 * Default bytes per sample for the given bits per sample.
 */
#define APARAMS_BPS(bits) (((bits) <= 8) ? 1 : (((bits) <= 16) ? 2 : 4))

struct aparams {
	unsigned int bps;		/* bytes per sample */
	unsigned int bits;		/* actually used bits */
	unsigned int le;		/* 1 if little endian, 0 if big endian */
	unsigned int sig;		/* 1 if signed, 0 if unsigned */
	unsigned int msb;		/* 1 if msb justified, 0 if lsb justified */
};

struct resamp {
#define RESAMP_NCTX	2
	unsigned int ctx_start;
	adata_t ctx[NCHAN_MAX * RESAMP_NCTX];
	unsigned int iblksz, oblksz;
	int diff;
	int idelta, odelta;		/* remainder of ipos/opos */
	int nch;
};

struct conv {
	int bfirst;			/* bytes to skip at startup */
	unsigned int bps;		/* bytes per sample */
	unsigned int shift;		/* shift to get 32bit MSB */
	unsigned int bias;			/* bias of unsigned samples */
	int bnext;			/* to reach the next byte */
	int snext;			/* to reach the next sample */
	int nch;
};

struct cmap {
	int istart;
	int inext;
	int onext;
	int ostart;
	int nch;
};

#define MIDI_TO_ADATA(m)	(aparams_ctltovol[m] << (ADATA_BITS - 16))
extern int aparams_ctltovol[128];

void aparams_init(struct aparams *);
void aparams_log(struct aparams *);
int aparams_strtoenc(struct aparams *, char *);
int aparams_enctostr(struct aparams *, char *);
int aparams_native(struct aparams *);

void resamp_getcnt(struct resamp *, int *, int *);
void resamp_do(struct resamp *, adata_t *, adata_t *, int, int);
void resamp_init(struct resamp *, unsigned int, unsigned int, int);
void enc_do(struct conv *, unsigned char *, unsigned char *, int);
void enc_sil_do(struct conv *, unsigned char *, int);
void enc_init(struct conv *, struct aparams *, int);
void dec_do(struct conv *, unsigned char *, unsigned char *, int);
void dec_do_float(struct conv *, unsigned char *, unsigned char *, int);
void dec_do_ulaw(struct conv *, unsigned char *, unsigned char *, int, int);
void dec_init(struct conv *, struct aparams *, int);
void cmap_add(struct cmap *, void *, void *, int, int);
void cmap_copy(struct cmap *, void *, void *, int, int);
void cmap_init(struct cmap *, int, int, int, int, int, int, int, int);

#endif /* !defined(DSP_H) */