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Annotation of src/usr.bin/aucat/aparams.h, Revision 1.9

1.9     ! ratchov     1: /*     $OpenBSD: aparams.h,v 1.8 2009/09/27 11:51:20 ratchov Exp $     */
1.1       ratchov     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:
1.2       ratchov    22: #define NCHAN_MAX      16              /* max channel in a stream */
                     23: #define RATE_MIN       4000            /* min sample rate */
                     24: #define RATE_MAX       192000          /* max sample rate */
                     25: #define BITS_MIN       1               /* min bits per sample */
1.1       ratchov    26: #define BITS_MAX       32              /* max bits per sample */
                     27:
1.2       ratchov    28: /*
1.6       ratchov    29:  * Maximum size of the encording string (the longest possible
                     30:  * encoding is ``s24le3msb'').
1.2       ratchov    31:  */
                     32: #define ENCMAX 10
                     33:
1.1       ratchov    34: #if BYTE_ORDER ==  LITTLE_ENDIAN
                     35: #define NATIVE_LE 1
                     36: #elif BYTE_ORDER == BIG_ENDIAN
                     37: #define NATIVE_LE 0
                     38: #else
                     39: /* not defined */
                     40: #endif
                     41:
                     42: /*
1.6       ratchov    43:  * Default bytes per sample for the given bits per sample.
1.2       ratchov    44:  */
                     45: #define APARAMS_BPS(bits) (((bits) <= 8) ? 1 : (((bits) <= 16) ? 2 : 4))
                     46:
                     47: /*
1.6       ratchov    48:  * Encoding specification.
1.1       ratchov    49:  */
                     50: struct aparams {
                     51:        unsigned bps;           /* bytes per sample */
                     52:        unsigned bits;          /* actually used bits */
                     53:        unsigned le;            /* 1 if little endian, 0 if big endian */
                     54:        unsigned sig;           /* 1 if signed, 0 if unsigned */
                     55:        unsigned msb;           /* 1 if msb justified, 0 if lsb justified */
                     56:        unsigned cmin, cmax;    /* provided/consumed channels */
                     57:        unsigned rate;          /* frames per second */
                     58: };
                     59:
                     60: /*
                     61:  * Samples are numbers in the interval [-1, 1[, note that 1, the upper
                     62:  * boundary is excluded. We represent them in 16-bit signed fixed point
                     63:  * numbers, so that we can do all multiplications and divisions in
                     64:  * 32-bit precision without having to deal with overflows.
                     65:  */
1.9     ! ratchov    66: typedef short adata_t;
        !            67: #define ADATA_BITS             16
        !            68: #define ADATA_MSB              1
        !            69: #define ADATA_MUL(x,y)         (((int)(x) * (int)(y)) >> (ADATA_BITS - 1))
        !            70: #define ADATA_MULDIV(x,y,z)    ((int)(x) * (int)(y) / (int)(z))
1.1       ratchov    71:
1.9     ! ratchov    72: #define ADATA_UNIT             (1 << (ADATA_BITS - 1))
1.1       ratchov    73: #define ADATA_MAX              (ADATA_UNIT - 1)
1.4       ratchov    74:
                     75: #define MIDI_MAXCTL            127
1.9     ! ratchov    76: #define MIDI_TO_ADATA(m)       (aparams_ctltovol[m] << (ADATA_BITS - 16))
1.4       ratchov    77:
                     78: extern int aparams_ctltovol[128];
1.7       ratchov    79: extern struct aparams aparams_none;
1.1       ratchov    80:
                     81: void aparams_init(struct aparams *, unsigned, unsigned, unsigned);
1.8       ratchov    82: void aparams_dbg(struct aparams *);
1.3       ratchov    83: int aparams_eqrate(struct aparams *, struct aparams *);
                     84: int aparams_eqenc(struct aparams *, struct aparams *);
1.1       ratchov    85: int aparams_eq(struct aparams *, struct aparams *);
1.3       ratchov    86: int aparams_subset(struct aparams *, struct aparams *);
1.5       ratchov    87: void aparams_grow(struct aparams *, struct aparams *);
1.1       ratchov    88: unsigned aparams_bpf(struct aparams *);
1.2       ratchov    89: int aparams_strtoenc(struct aparams *, char *);
                     90: int aparams_enctostr(struct aparams *, char *);
                     91: void aparams_copyenc(struct aparams *, struct aparams *);
1.1       ratchov    92:
                     93: #endif /* !defined(APARAMS_H) */