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Annotation of src/usr.bin/aucat/aparams.h, Revision 1.10

1.10    ! ratchov     1: /*     $OpenBSD: aparams.h,v 1.9 2010/11/04 17:55:28 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: /*
1.6       ratchov    35:  * Default bytes per sample for the given bits per sample.
1.2       ratchov    36:  */
                     37: #define APARAMS_BPS(bits) (((bits) <= 8) ? 1 : (((bits) <= 16) ? 2 : 4))
                     38:
                     39: /*
1.6       ratchov    40:  * Encoding specification.
1.1       ratchov    41:  */
                     42: struct aparams {
                     43:        unsigned bps;           /* bytes per sample */
                     44:        unsigned bits;          /* actually used bits */
                     45:        unsigned le;            /* 1 if little endian, 0 if big endian */
                     46:        unsigned sig;           /* 1 if signed, 0 if unsigned */
                     47:        unsigned msb;           /* 1 if msb justified, 0 if lsb justified */
                     48:        unsigned cmin, cmax;    /* provided/consumed channels */
                     49:        unsigned rate;          /* frames per second */
                     50: };
                     51:
                     52: /*
                     53:  * Samples are numbers in the interval [-1, 1[, note that 1, the upper
1.10    ! ratchov    54:  * boundary is excluded. We represent them as signed fixed point numbers
        !            55:  * of ADATA_BITS. We also assume that 2^(ADATA_BITS - 1) fits in a int.
1.1       ratchov    56:  */
1.10    ! ratchov    57: #define ADATA_BITS                     16
        !            58: #define ADATA_LE                       (BYTE_ORDER == LITTLE_ENDIAN)
        !            59: #define ADATA_UNIT                     (1 << (ADATA_BITS - 1))
        !            60:
1.9       ratchov    61: typedef short adata_t;
1.10    ! ratchov    62:
1.9       ratchov    63: #define ADATA_MUL(x,y)         (((int)(x) * (int)(y)) >> (ADATA_BITS - 1))
                     64: #define ADATA_MULDIV(x,y,z)    ((int)(x) * (int)(y) / (int)(z))
1.4       ratchov    65:
                     66: #define MIDI_MAXCTL            127
1.9       ratchov    67: #define MIDI_TO_ADATA(m)       (aparams_ctltovol[m] << (ADATA_BITS - 16))
1.4       ratchov    68:
                     69: extern int aparams_ctltovol[128];
1.7       ratchov    70: extern struct aparams aparams_none;
1.1       ratchov    71:
                     72: void aparams_init(struct aparams *, unsigned, unsigned, unsigned);
1.8       ratchov    73: void aparams_dbg(struct aparams *);
1.3       ratchov    74: int aparams_eqrate(struct aparams *, struct aparams *);
                     75: int aparams_eqenc(struct aparams *, struct aparams *);
1.1       ratchov    76: int aparams_eq(struct aparams *, struct aparams *);
1.3       ratchov    77: int aparams_subset(struct aparams *, struct aparams *);
1.5       ratchov    78: void aparams_grow(struct aparams *, struct aparams *);
1.1       ratchov    79: unsigned aparams_bpf(struct aparams *);
1.2       ratchov    80: int aparams_strtoenc(struct aparams *, char *);
                     81: int aparams_enctostr(struct aparams *, char *);
                     82: void aparams_copyenc(struct aparams *, struct aparams *);
1.1       ratchov    83:
                     84: #endif /* !defined(APARAMS_H) */