diff options
Diffstat (limited to 'dsp/dsp.h')
| -rw-r--r-- | dsp/dsp.h | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/dsp/dsp.h b/dsp/dsp.h deleted file mode 100644 index d057d37..0000000 --- a/dsp/dsp.h +++ /dev/null @@ -1,163 +0,0 @@ -/* $OpenBSD$ */ -/* - * Copyright (c) 2012 Alexandre Ratchov <alex@caoua.org> - * - * Permission to use, copy, modify, and distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR - * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN - * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF - * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - */ -#ifndef DSP_H -#define DSP_H - -#include <sys/types.h> -#include "defs.h" - -/* - * Samples are numbers in the interval [-1, 1[, note that 1, the upper - * boundary is excluded. We represent them as signed fixed point numbers - * of ADATA_BITS. We also assume that 2^(ADATA_BITS - 1) fits in a int. - */ -#ifndef ADATA_BITS -#define ADATA_BITS 16 -#endif -#define ADATA_LE (BYTE_ORDER == LITTLE_ENDIAN) -#define ADATA_UNIT (1 << (ADATA_BITS - 1)) - -#if ADATA_BITS == 16 - -#define ADATA_MUL(x,y) (((int)(x) * (int)(y)) >> (ADATA_BITS - 1)) -#define ADATA_MULDIV(x,y,z) ((int)(x) * (int)(y) / (int)(z)) - -typedef short adata_t; - -#elif ADATA_BITS == 24 - -#if defined(__i386__) && defined(__GNUC__) - -static inline int -fp24_mul(int x, int a) -{ - int res; - - asm volatile ( - "imull %2\n\t" - "shrdl $23, %%edx, %%eax\n\t" - : "=a" (res) - : "a" (x), "r" (a) - : "%edx" - ); - return res; -} - -static inline int -fp24_muldiv(int x, int a, int b) -{ - int res; - - asm volatile ( - "imull %2\n\t" - "idivl %3\n\t" - : "=a" (res) - : "a" (x), "d" (a), "r" (b) - ); - return res; -} - -#define ADATA_MUL(x,y) fp24_mul(x, y) -#define ADATA_MULDIV(x,y,z) fp24_muldiv(x, y, z); - -#elif defined(__amd64__) || defined(__sparc64__) - -#define ADATA_MUL(x,y) \ - ((int)(((long long)(x) * (long long)(y)) >> (ADATA_BITS - 1))) -#define ADATA_MULDIV(x,y,z) \ - ((int)((long long)(x) * (long long)(y) / (long long)(z))) - -#else -#error "no 24-bit code for this architecture" -#endif - -typedef int adata_t; - -#else -#error "only 16-bit and 24-bit precisions are supported" -#endif - -/* - * Maximum size of the encording string (the longest possible - * encoding is ``s24le3msb''). - */ -#define ENCMAX 10 - -/* - * Default bytes per sample for the given bits per sample. - */ -#define APARAMS_BPS(bits) (((bits) <= 8) ? 1 : (((bits) <= 16) ? 2 : 4)) - -struct aparams { - unsigned int bps; /* bytes per sample */ - unsigned int bits; /* actually used bits */ - unsigned int le; /* 1 if little endian, 0 if big endian */ - unsigned int sig; /* 1 if signed, 0 if unsigned */ - unsigned int msb; /* 1 if msb justified, 0 if lsb justified */ -}; - -struct resamp { -#define RESAMP_NCTX 2 - unsigned int ctx_start; - adata_t ctx[NCHAN_MAX * RESAMP_NCTX]; - unsigned int iblksz, oblksz; - int diff; - int nch; -}; - -struct conv { - int bfirst; /* bytes to skip at startup */ - unsigned int bps; /* bytes per sample */ - unsigned int shift; /* shift to get 32bit MSB */ - unsigned int bias; /* bias of unsigned samples */ - int bnext; /* to reach the next byte */ - int snext; /* to reach the next sample */ - int nch; -}; - -struct cmap { - int istart; - int inext; - int onext; - int ostart; - int nch; -}; - -#define MIDI_TO_ADATA(m) (aparams_ctltovol[m] << (ADATA_BITS - 16)) -extern int aparams_ctltovol[128]; - -void aparams_init(struct aparams *); -void aparams_log(struct aparams *); -int aparams_strtoenc(struct aparams *, char *); -int aparams_enctostr(struct aparams *, char *); -int aparams_native(struct aparams *); - -void resamp_getcnt(struct resamp *, int *, int *); -void resamp_do(struct resamp *, adata_t *, adata_t *, int, int); -void resamp_init(struct resamp *, unsigned int, unsigned int, int); -void enc_do(struct conv *, unsigned char *, unsigned char *, int); -void enc_sil_do(struct conv *, unsigned char *, int); -void enc_init(struct conv *, struct aparams *, int); -void dec_do(struct conv *, unsigned char *, unsigned char *, int); -void dec_do_float(struct conv *, unsigned char *, unsigned char *, int); -void dec_do_ulaw(struct conv *, unsigned char *, unsigned char *, int, int); -void dec_init(struct conv *, struct aparams *, int); -void cmap_add(struct cmap *, void *, void *, int, int); -void cmap_copy(struct cmap *, void *, void *, int, int); -void cmap_init(struct cmap *, int, int, int, int, int, int, int, int); - -#endif /* !defined(DSP_H) */ |