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Annotation of src/usr.bin/aucat/aparams.h, Revision 1.1

1.1     ! ratchov     1: /*     $OpenBSD$       */
        !             2: /*
        !             3:  * Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
        !             4:  *
        !             5:  * Permission to use, copy, modify, and distribute this software for any
        !             6:  * purpose with or without fee is hereby granted, provided that the above
        !             7:  * copyright notice and this permission notice appear in all copies.
        !             8:  *
        !             9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !            10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            16:  */
        !            17: #ifndef APARAMS_H
        !            18: #define APARAMS_H
        !            19:
        !            20: #include <sys/param.h>
        !            21:
        !            22: #define CHAN_MAX       16              /* max number of channels */
        !            23: #define RATE_MIN       1               /* min sample rate */
        !            24: #define RATE_MAX       (1 << 30)       /* max sample rate */
        !            25: #define BITS_MAX       32              /* max bits per sample */
        !            26:
        !            27: #if BYTE_ORDER ==  LITTLE_ENDIAN
        !            28: #define NATIVE_LE 1
        !            29: #elif BYTE_ORDER == BIG_ENDIAN
        !            30: #define NATIVE_LE 0
        !            31: #else
        !            32: /* not defined */
        !            33: #endif
        !            34:
        !            35: /*
        !            36:  * encoding specification
        !            37:  */
        !            38: struct aparams {
        !            39:        unsigned bps;           /* bytes per sample */
        !            40:        unsigned bits;          /* actually used bits */
        !            41:        unsigned le;            /* 1 if little endian, 0 if big endian */
        !            42:        unsigned sig;           /* 1 if signed, 0 if unsigned */
        !            43:        unsigned msb;           /* 1 if msb justified, 0 if lsb justified */
        !            44:        unsigned cmin, cmax;    /* provided/consumed channels */
        !            45:        unsigned rate;          /* frames per second */
        !            46: };
        !            47:
        !            48: /*
        !            49:  * Samples are numbers in the interval [-1, 1[, note that 1, the upper
        !            50:  * boundary is excluded. We represent them in 16-bit signed fixed point
        !            51:  * numbers, so that we can do all multiplications and divisions in
        !            52:  * 32-bit precision without having to deal with overflows.
        !            53:  */
        !            54:
        !            55: #define ADATA_SHIFT            (8 * sizeof(short) - 1)
        !            56: #define ADATA_UNIT             (1 << ADATA_SHIFT)
        !            57: #define ADATA_MAX              (ADATA_UNIT - 1)
        !            58: #define ADATA_MUL(x,y)         (((x) * (y)) >> ADATA_SHIFT)
        !            59:
        !            60: void aparams_init(struct aparams *, unsigned, unsigned, unsigned);
        !            61: void aparams_print(struct aparams *);
        !            62: void aparams_print2(struct aparams *, struct aparams *);
        !            63: int aparams_eq(struct aparams *, struct aparams *);
        !            64: unsigned aparams_bpf(struct aparams *);
        !            65:
        !            66: #endif /* !defined(APARAMS_H) */