Annotation of src/usr.bin/aucat/aparams.h, Revision 1.13
1.13 ! deraadt 1: /* $OpenBSD: aparams.h,v 1.12 2012/04/11 06:05:43 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:
1.2 ratchov 20: #define NCHAN_MAX 16 /* max channel in a stream */
21: #define RATE_MIN 4000 /* min sample rate */
22: #define RATE_MAX 192000 /* max sample rate */
23: #define BITS_MIN 1 /* min bits per sample */
1.1 ratchov 24: #define BITS_MAX 32 /* max bits per sample */
25:
1.2 ratchov 26: /*
1.6 ratchov 27: * Maximum size of the encording string (the longest possible
28: * encoding is ``s24le3msb'').
1.2 ratchov 29: */
30: #define ENCMAX 10
31:
1.1 ratchov 32: /*
1.6 ratchov 33: * Default bytes per sample for the given bits per sample.
1.2 ratchov 34: */
35: #define APARAMS_BPS(bits) (((bits) <= 8) ? 1 : (((bits) <= 16) ? 2 : 4))
36:
37: /*
1.6 ratchov 38: * Encoding specification.
1.1 ratchov 39: */
40: struct aparams {
1.12 ratchov 41: unsigned int bps; /* bytes per sample */
42: unsigned int bits; /* actually used bits */
43: unsigned int le; /* 1 if little endian, 0 if big endian */
44: unsigned int sig; /* 1 if signed, 0 if unsigned */
45: unsigned int msb; /* 1 if msb justified, 0 if lsb justified */
46: unsigned int cmin, cmax; /* provided/consumed channels */
47: unsigned int rate; /* frames per second */
1.1 ratchov 48: };
49:
50: /*
51: * Samples are numbers in the interval [-1, 1[, note that 1, the upper
1.10 ratchov 52: * boundary is excluded. We represent them as signed fixed point numbers
53: * of ADATA_BITS. We also assume that 2^(ADATA_BITS - 1) fits in a int.
1.1 ratchov 54: */
1.11 ratchov 55: #ifndef ADATA_BITS
1.10 ratchov 56: #define ADATA_BITS 16
1.11 ratchov 57: #endif
1.10 ratchov 58: #define ADATA_LE (BYTE_ORDER == LITTLE_ENDIAN)
59: #define ADATA_UNIT (1 << (ADATA_BITS - 1))
60:
1.11 ratchov 61: #if ADATA_BITS == 16
62:
1.9 ratchov 63: typedef short adata_t;
1.10 ratchov 64:
1.9 ratchov 65: #define ADATA_MUL(x,y) (((int)(x) * (int)(y)) >> (ADATA_BITS - 1))
66: #define ADATA_MULDIV(x,y,z) ((int)(x) * (int)(y) / (int)(z))
1.11 ratchov 67:
68: #elif ADATA_BITS == 24
69:
70: typedef int adata_t;
71:
72: #if defined(__i386__) && defined(__GNUC__)
73:
74: static inline int
75: fp24_mul(int x, int a)
76: {
77: int res;
78:
79: asm volatile (
80: "imull %2\n\t"
81: "shrdl $23, %%edx, %%eax\n\t"
82: : "=a" (res)
83: : "a" (x), "r" (a)
84: : "%edx"
85: );
86: return res;
87: }
88:
89: static inline int
90: fp24_muldiv(int x, int a, int b)
91: {
92: int res;
93:
94: asm volatile (
95: "imull %2\n\t"
96: "idivl %3\n\t"
97: : "=a" (res)
98: : "a" (x), "d" (a), "r" (b)
99: );
100: return res;
101: }
102:
103: #define ADATA_MUL(x,y) fp24_mul(x, y)
104: #define ADATA_MULDIV(x,y,z) fp24_muldiv(x, y, z);
105:
106: #elif defined(__amd64__) || defined(__sparc64__)
107:
108: #define ADATA_MUL(x,y) \
109: ((int)(((long long)(x) * (long long)(y)) >> (ADATA_BITS - 1)))
110: #define ADATA_MULDIV(x,y,z) \
111: ((int)((long long)(x) * (long long)(y) / (long long)(z)))
112:
113: #else
114: #error "no 24-bit code for this architecture"
115: #endif
116:
117: #else
118: #error "only 16-bit and 24-bit precisions are supported"
119: #endif
1.4 ratchov 120:
121: #define MIDI_MAXCTL 127
1.9 ratchov 122: #define MIDI_TO_ADATA(m) (aparams_ctltovol[m] << (ADATA_BITS - 16))
1.4 ratchov 123:
124: extern int aparams_ctltovol[128];
1.7 ratchov 125: extern struct aparams aparams_none;
1.1 ratchov 126:
1.12 ratchov 127: void aparams_init(struct aparams *, unsigned int, unsigned int, unsigned int);
1.8 ratchov 128: void aparams_dbg(struct aparams *);
1.3 ratchov 129: int aparams_eqrate(struct aparams *, struct aparams *);
130: int aparams_eqenc(struct aparams *, struct aparams *);
1.1 ratchov 131: int aparams_eq(struct aparams *, struct aparams *);
1.3 ratchov 132: int aparams_subset(struct aparams *, struct aparams *);
1.5 ratchov 133: void aparams_grow(struct aparams *, struct aparams *);
1.12 ratchov 134: unsigned int aparams_bpf(struct aparams *);
1.2 ratchov 135: int aparams_strtoenc(struct aparams *, char *);
136: int aparams_enctostr(struct aparams *, char *);
137: void aparams_copyenc(struct aparams *, struct aparams *);
1.1 ratchov 138:
139: #endif /* !defined(APARAMS_H) */
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