mirror of https://github.com/ericonr/sndio.git
142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef APARAMS_H
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#define APARAMS_H
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#include <sys/param.h>
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#define NCHAN_MAX 16 /* max channel in a stream */
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#define RATE_MIN 4000 /* min sample rate */
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#define RATE_MAX 192000 /* max sample rate */
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#define BITS_MIN 1 /* min bits per sample */
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#define BITS_MAX 32 /* max bits per sample */
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/*
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* Maximum size of the encording string (the longest possible
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* encoding is ``s24le3msb'').
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*/
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#define ENCMAX 10
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/*
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* Default bytes per sample for the given bits per sample.
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*/
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#define APARAMS_BPS(bits) (((bits) <= 8) ? 1 : (((bits) <= 16) ? 2 : 4))
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/*
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* Encoding specification.
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*/
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struct aparams {
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unsigned int bps; /* bytes per sample */
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unsigned int bits; /* actually used bits */
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unsigned int le; /* 1 if little endian, 0 if big endian */
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unsigned int sig; /* 1 if signed, 0 if unsigned */
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unsigned int msb; /* 1 if msb justified, 0 if lsb justified */
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unsigned int cmin, cmax; /* provided/consumed channels */
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unsigned int rate; /* frames per second */
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};
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/*
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* Samples are numbers in the interval [-1, 1[, note that 1, the upper
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* boundary is excluded. We represent them as signed fixed point numbers
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* of ADATA_BITS. We also assume that 2^(ADATA_BITS - 1) fits in a int.
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*/
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#ifndef ADATA_BITS
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#define ADATA_BITS 16
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#endif
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#define ADATA_LE (BYTE_ORDER == LITTLE_ENDIAN)
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#define ADATA_UNIT (1 << (ADATA_BITS - 1))
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#if ADATA_BITS == 16
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typedef short adata_t;
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#define ADATA_MUL(x,y) (((int)(x) * (int)(y)) >> (ADATA_BITS - 1))
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#define ADATA_MULDIV(x,y,z) ((int)(x) * (int)(y) / (int)(z))
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#elif ADATA_BITS == 24
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typedef int adata_t;
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#if defined(__i386__) && defined(__GNUC__)
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static inline int
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fp24_mul(int x, int a)
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{
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int res;
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asm volatile (
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"imull %2\n\t"
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"shrdl $23, %%edx, %%eax\n\t"
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: "=a" (res)
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: "a" (x), "r" (a)
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: "%edx"
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);
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return res;
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}
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static inline int
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fp24_muldiv(int x, int a, int b)
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{
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int res;
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asm volatile (
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"imull %2\n\t"
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"idivl %3\n\t"
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: "=a" (res)
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: "a" (x), "d" (a), "r" (b)
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);
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return res;
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}
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#define ADATA_MUL(x,y) fp24_mul(x, y)
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#define ADATA_MULDIV(x,y,z) fp24_muldiv(x, y, z);
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#elif defined(__amd64__) || defined(__sparc64__)
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#define ADATA_MUL(x,y) \
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((int)(((long long)(x) * (long long)(y)) >> (ADATA_BITS - 1)))
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#define ADATA_MULDIV(x,y,z) \
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((int)((long long)(x) * (long long)(y) / (long long)(z)))
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#else
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#error "no 24-bit code for this architecture"
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#endif
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#else
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#error "only 16-bit and 24-bit precisions are supported"
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#endif
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#define MIDI_MAXCTL 127
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#define MIDI_TO_ADATA(m) (aparams_ctltovol[m] << (ADATA_BITS - 16))
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extern int aparams_ctltovol[128];
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extern struct aparams aparams_none;
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void aparams_init(struct aparams *, unsigned int, unsigned int, unsigned int);
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void aparams_dbg(struct aparams *);
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int aparams_eqrate(struct aparams *, struct aparams *);
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int aparams_eqenc(struct aparams *, struct aparams *);
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int aparams_eq(struct aparams *, struct aparams *);
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int aparams_subset(struct aparams *, struct aparams *);
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void aparams_grow(struct aparams *, struct aparams *);
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unsigned int aparams_bpf(struct aparams *);
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int aparams_strtoenc(struct aparams *, char *);
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int aparams_enctostr(struct aparams *, char *);
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void aparams_copyenc(struct aparams *, struct aparams *);
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#endif /* !defined(APARAMS_H) */
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