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/* $OpenBSD: aparams.h,v 1.11 2010/11/05 16:42:17 ratchov Exp $ */
/*
* Copyright (c) 2008 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 APARAMS_H
#define APARAMS_H
#include <sys/param.h>
#define NCHAN_MAX 16 /* max channel in a stream */
#define RATE_MIN 4000 /* min sample rate */
#define RATE_MAX 192000 /* max sample rate */
#define BITS_MIN 1 /* min bits per sample */
#define BITS_MAX 32 /* max bits per sample */
/*
* 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))
/*
* Encoding specification.
*/
struct aparams {
unsigned bps; /* bytes per sample */
unsigned bits; /* actually used bits */
unsigned le; /* 1 if little endian, 0 if big endian */
unsigned sig; /* 1 if signed, 0 if unsigned */
unsigned msb; /* 1 if msb justified, 0 if lsb justified */
unsigned cmin, cmax; /* provided/consumed channels */
unsigned rate; /* frames per second */
};
/*
* 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
typedef short adata_t;
#define ADATA_MUL(x,y) (((int)(x) * (int)(y)) >> (ADATA_BITS - 1))
#define ADATA_MULDIV(x,y,z) ((int)(x) * (int)(y) / (int)(z))
#elif ADATA_BITS == 24
typedef int adata_t;
#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
#else
#error "only 16-bit and 24-bit precisions are supported"
#endif
#define MIDI_MAXCTL 127
#define MIDI_TO_ADATA(m) (aparams_ctltovol[m] << (ADATA_BITS - 16))
extern int aparams_ctltovol[128];
extern struct aparams aparams_none;
void aparams_init(struct aparams *, unsigned, unsigned, unsigned);
void aparams_dbg(struct aparams *);
int aparams_eqrate(struct aparams *, struct aparams *);
int aparams_eqenc(struct aparams *, struct aparams *);
int aparams_eq(struct aparams *, struct aparams *);
int aparams_subset(struct aparams *, struct aparams *);
void aparams_grow(struct aparams *, struct aparams *);
unsigned aparams_bpf(struct aparams *);
int aparams_strtoenc(struct aparams *, char *);
int aparams_enctostr(struct aparams *, char *);
void aparams_copyenc(struct aparams *, struct aparams *);
#endif /* !defined(APARAMS_H) */
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