Annotation of src/usr.bin/sndiod/dsp.h, Revision 1.2
1.2 ! ratchov 1: /* $OpenBSD: dsp.h,v 1.1 2012/11/23 07:03:28 ratchov Exp $ */
1.1 ratchov 2: /*
3: * Copyright (c) 2012 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 DSP_H
18: #define DSP_H
19:
20: #include <sys/types.h>
21: #include "defs.h"
22:
23: /*
24: * Samples are numbers in the interval [-1, 1[, note that 1, the upper
25: * boundary is excluded. We represent them as signed fixed point numbers
26: * of ADATA_BITS. We also assume that 2^(ADATA_BITS - 1) fits in a int.
27: */
28: #ifndef ADATA_BITS
29: #define ADATA_BITS 16
30: #endif
31: #define ADATA_LE (BYTE_ORDER == LITTLE_ENDIAN)
32: #define ADATA_UNIT (1 << (ADATA_BITS - 1))
33:
34: #if ADATA_BITS == 16
35:
36: #define ADATA_MUL(x,y) (((int)(x) * (int)(y)) >> (ADATA_BITS - 1))
37: #define ADATA_MULDIV(x,y,z) ((int)(x) * (int)(y) / (int)(z))
38:
39: typedef short adata_t;
40:
41: #elif ADATA_BITS == 24
42:
43: #if defined(__i386__) && defined(__GNUC__)
44:
45: static inline int
46: fp24_mul(int x, int a)
47: {
48: int res;
49:
50: asm volatile (
51: "imull %2\n\t"
52: "shrdl $23, %%edx, %%eax\n\t"
53: : "=a" (res)
54: : "a" (x), "r" (a)
55: : "%edx"
56: );
57: return res;
58: }
59:
60: static inline int
61: fp24_muldiv(int x, int a, int b)
62: {
63: int res;
64:
65: asm volatile (
66: "imull %2\n\t"
67: "idivl %3\n\t"
68: : "=a" (res)
69: : "a" (x), "d" (a), "r" (b)
70: );
71: return res;
72: }
73:
74: #define ADATA_MUL(x,y) fp24_mul(x, y)
75: #define ADATA_MULDIV(x,y,z) fp24_muldiv(x, y, z);
76:
77: #elif defined(__amd64__) || defined(__sparc64__)
78:
79: #define ADATA_MUL(x,y) \
80: ((int)(((long long)(x) * (long long)(y)) >> (ADATA_BITS - 1)))
81: #define ADATA_MULDIV(x,y,z) \
82: ((int)((long long)(x) * (long long)(y) / (long long)(z)))
83:
84: #else
85: #error "no 24-bit code for this architecture"
86: #endif
87:
88: typedef int adata_t;
89:
90: #else
91: #error "only 16-bit and 24-bit precisions are supported"
92: #endif
93:
94: /*
95: * Maximum size of the encording string (the longest possible
96: * encoding is ``s24le3msb'').
97: */
98: #define ENCMAX 10
99:
100: /*
101: * Default bytes per sample for the given bits per sample.
102: */
103: #define APARAMS_BPS(bits) (((bits) <= 8) ? 1 : (((bits) <= 16) ? 2 : 4))
104:
105: struct aparams {
106: unsigned int bps; /* bytes per sample */
107: unsigned int bits; /* actually used bits */
108: unsigned int le; /* 1 if little endian, 0 if big endian */
109: unsigned int sig; /* 1 if signed, 0 if unsigned */
110: unsigned int msb; /* 1 if msb justified, 0 if lsb justified */
111: };
112:
113: struct resamp {
114: #define RESAMP_NCTX 2
115: unsigned int ctx_start;
116: adata_t ctx[NCHAN_MAX * RESAMP_NCTX];
117: unsigned int iblksz, oblksz;
118: int diff;
119: int idelta, odelta; /* remainder of ipos/opos */
120: int nch;
121: };
122:
123: struct conv {
124: int bfirst; /* bytes to skip at startup */
125: unsigned int bps; /* bytes per sample */
126: unsigned int shift; /* shift to get 32bit MSB */
127: int sigbit; /* sign bits to XOR */
128: int bnext; /* to reach the next byte */
129: int snext; /* to reach the next sample */
130: int nch;
131: };
132:
133: struct cmap {
134: int istart;
135: int inext;
136: int onext;
137: int ostart;
138: int nch;
139: };
140:
141: #define MIDI_TO_ADATA(m) (aparams_ctltovol[m] << (ADATA_BITS - 16))
142: extern int aparams_ctltovol[128];
143:
144: void aparams_init(struct aparams *);
145: void aparams_log(struct aparams *);
146: int aparams_strtoenc(struct aparams *, char *);
147: int aparams_enctostr(struct aparams *, char *);
148: int aparams_native(struct aparams *);
149:
150: int resamp_do(struct resamp *, adata_t *, adata_t *, int);
151: void resamp_init(struct resamp *, unsigned int, unsigned int, int);
152: void enc_do(struct conv *, unsigned char *, unsigned char *, int);
153: void enc_sil_do(struct conv *, unsigned char *, int);
154: void enc_init(struct conv *, struct aparams *, int);
155: void dec_do(struct conv *, unsigned char *, unsigned char *, int);
156: void dec_init(struct conv *, struct aparams *, int);
157: void cmap_add(struct cmap *, void *, void *, int, int);
158: void cmap_copy(struct cmap *, void *, void *, int, int);
159: void cmap_init(struct cmap *, int, int, int, int, int, int, int, int);
1.2 ! ratchov 160: int sqrtone(int, adata_t *, int, int, int);
1.1 ratchov 161:
162: #endif /* !defined(DSP_H) */
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