mirror of https://github.com/ericonr/sndio.git
91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
/* $OpenBSD: aparams.h,v 1.8 2009/09/27 11:51:20 ratchov Exp $ */
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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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#if BYTE_ORDER == LITTLE_ENDIAN
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#define NATIVE_LE 1
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#elif BYTE_ORDER == BIG_ENDIAN
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#define NATIVE_LE 0
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#else
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/* not defined */
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#endif
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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 bps; /* bytes per sample */
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unsigned bits; /* actually used bits */
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unsigned le; /* 1 if little endian, 0 if big endian */
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unsigned sig; /* 1 if signed, 0 if unsigned */
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unsigned msb; /* 1 if msb justified, 0 if lsb justified */
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unsigned cmin, cmax; /* provided/consumed channels */
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unsigned 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 in 16-bit signed fixed point
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* numbers, so that we can do all multiplications and divisions in
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* 32-bit precision without having to deal with overflows.
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*/
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#define ADATA_SHIFT (8 * sizeof(short) - 1)
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#define ADATA_UNIT (1 << ADATA_SHIFT)
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#define ADATA_MAX (ADATA_UNIT - 1)
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#define ADATA_MUL(x,y) (((x) * (y)) >> ADATA_SHIFT)
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#define MIDI_MAXCTL 127
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#define MIDI_TO_ADATA(m) (aparams_ctltovol[m])
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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, unsigned, unsigned);
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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 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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