/* $OpenBSD: aparams.c,v 1.9 2009/09/27 11:51:20 ratchov Exp $ */ /* * Copyright (c) 2008 Alexandre Ratchov * * 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. */ #include "aparams.h" int aparams_ctltovol[128] = { 0, 256, 266, 276, 287, 299, 310, 323, 335, 348, 362, 376, 391, 406, 422, 439, 456, 474, 493, 512, 532, 553, 575, 597, 621, 645, 670, 697, 724, 753, 782, 813, 845, 878, 912, 948, 985, 1024, 1064, 1106, 1149, 1195, 1241, 1290, 1341, 1393, 1448, 1505, 1564, 1625, 1689, 1756, 1825, 1896, 1971, 2048, 2128, 2212, 2299, 2389, 2483, 2580, 2682, 2787, 2896, 3010, 3128, 3251, 3379, 3511, 3649, 3792, 3941, 4096, 4257, 4424, 4598, 4778, 4966, 5161, 5363, 5574, 5793, 6020, 6256, 6502, 6757, 7023, 7298, 7585, 7883, 8192, 8514, 8848, 9195, 9556, 9931, 10321, 10726, 11148, 11585, 12040, 12513, 13004, 13515, 14045, 14596, 15170, 15765, 16384, 17027, 17696, 18390, 19112, 19863, 20643, 21453, 22295, 23170, 24080, 25025, 26008, 27029, 28090, 29193, 30339, 31530, 32768 }; /* * Fake parameters for byte-streams */ struct aparams aparams_none = { 1, 0, 0, 0, 0, 0, 0, 0 }; /* * Generate a string corresponding to the encoding in par, * return the length of the resulting string. */ int aparams_enctostr(struct aparams *par, char *ostr) { char *p = ostr; *p++ = par->sig ? 's' : 'u'; if (par->bits > 9) *p++ = '0' + par->bits / 10; *p++ = '0' + par->bits % 10; if (par->bps > 1) { *p++ = par->le ? 'l' : 'b'; *p++ = 'e'; if (par->bps != APARAMS_BPS(par->bits) || par->bits < par->bps * 8) { *p++ = par->bps + '0'; if (par->bits < par->bps * 8) { *p++ = par->msb ? 'm' : 'l'; *p++ = 's'; *p++ = 'b'; } } } *p++ = '\0'; return p - ostr - 1; } /* * Parse an encoding string, examples: s8, u8, s16, s16le, s24be ... * set *istr to the char following the encoding. Return the number * of bytes consumed. */ int aparams_strtoenc(struct aparams *par, char *istr) { char *p = istr; int i, sig, bits, le, bps, msb; #define IS_SEP(c) \ (((c) < 'a' || (c) > 'z') && \ ((c) < 'A' || (c) > 'Z') && \ ((c) < '0' || (c) > '9')) /* * get signedness */ if (*p == 's') { sig = 1; } else if (*p == 'u') { sig = 0; } else return 0; p++; /* * get number of bits per sample */ bits = 0; for (i = 0; i < 2; i++) { if (*p < '0' || *p > '9') break; bits = (bits * 10) + *p - '0'; p++; } if (bits < BITS_MIN || bits > BITS_MAX) return 0; bps = APARAMS_BPS(bits); msb = 1; le = NATIVE_LE; /* * get (optional) endianness */ if (p[0] == 'l' && p[1] == 'e') { le = 1; p += 2; } else if (p[0] == 'b' && p[1] == 'e') { le = 0; p += 2; } else if (IS_SEP(*p)) { goto done; } else return 0; /* * get (optional) number of bytes */ if (*p >= '0' && *p <= '9') { bps = *p - '0'; if (bps < (bits + 7) / 8 || bps > (BITS_MAX + 7) / 8) return 0; p++; /* * get (optional) alignement */ if (p[0] == 'm' && p[1] == 's' && p[2] == 'b') { msb = 1; p += 3; } else if (p[0] == 'l' && p[1] == 's' && p[2] == 'b') { msb = 0; p += 3; } else if (IS_SEP(*p)) { goto done; } else return 0; } else if (!IS_SEP(*p)) return 0; done: par->msb = msb; par->sig = sig; par->bits = bits; par->bps = bps; par->le = le; return p - istr; } /* * Initialise parameters structure with the defaults natively supported * by the machine. */ void aparams_init(struct aparams *par, unsigned cmin, unsigned cmax, unsigned rate) { par->bps = 2; /* 2 bytes per sample */ par->bits = 16; /* 16 significant bits per sample */ par->sig = 1; /* samples are signed */ par->le = NATIVE_LE; par->msb = 1; /* msb justified */ par->cmin = cmin; par->cmax = cmax; par->rate = rate; } /* * Return true if both encodings are the same. */ int aparams_eqenc(struct aparams *par1, struct aparams *par2) { if (par1->bps != par2->bps || par1->bits != par2->bits || par1->sig != par2->sig) return 0; if ((par1->bits != 8 * par1->bps) && par1->msb != par2->msb) return 0; if (par1->bps > 1 && par1->le != par2->le) return 0; return 1; } /* * Return true if both parameters are the same. */ int aparams_eq(struct aparams *par1, struct aparams *par2) { if (!aparams_eqenc(par1, par2) || par1->cmin != par2->cmin || par1->cmax != par2->cmax || par1->rate != par2->rate) return 0; return 1; } /* * Return true if first channel range includes second range. */ int aparams_subset(struct aparams *subset, struct aparams *set) { return subset->cmin >= set->cmin && subset->cmax <= set->cmax; } /* * Grow channels range and sample rate of ``set'' in order ``subset'' to * become an actual subset of it. */ void aparams_grow(struct aparams *set, struct aparams *subset) { if (set->cmin > subset->cmin) set->cmin = subset->cmin; if (set->cmax < subset->cmax) set->cmax = subset->cmax; if (set->rate < subset->rate) set->rate = subset->rate; } /* * Return true if rates are the same. */ int aparams_eqrate(struct aparams *p1, struct aparams *p2) { /* XXX: allow 1/9 halftone of difference */ return p1->rate == p2->rate; } /* * Return the number of bytes per frame with the given parameters. */ unsigned aparams_bpf(struct aparams *par) { return (par->cmax - par->cmin + 1) * par->bps; } void aparams_copyenc(struct aparams *dst, struct aparams *src) { dst->sig = src->sig; dst->le = src->le; dst->msb = src->msb; dst->bits = src->bits; dst->bps = src->bps; }