mirror of https://github.com/ericonr/sndio.git
291 lines
6.5 KiB
C
291 lines
6.5 KiB
C
/* $OpenBSD: aparams.c,v 1.10 2010/01/10 21:47:41 ratchov Exp $ */
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/*
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* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "aparams.h"
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#ifdef DEBUG
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#include "dbg.h"
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#endif
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int aparams_ctltovol[128] = {
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0,
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256, 266, 276, 287, 299, 310, 323, 335,
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348, 362, 376, 391, 406, 422, 439, 456,
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474, 493, 512, 532, 553, 575, 597, 621,
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645, 670, 697, 724, 753, 782, 813, 845,
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878, 912, 948, 985, 1024, 1064, 1106, 1149,
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1195, 1241, 1290, 1341, 1393, 1448, 1505, 1564,
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1625, 1689, 1756, 1825, 1896, 1971, 2048, 2128,
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2212, 2299, 2389, 2483, 2580, 2682, 2787, 2896,
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3010, 3128, 3251, 3379, 3511, 3649, 3792, 3941,
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4096, 4257, 4424, 4598, 4778, 4966, 5161, 5363,
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5574, 5793, 6020, 6256, 6502, 6757, 7023, 7298,
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7585, 7883, 8192, 8514, 8848, 9195, 9556, 9931,
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10321, 10726, 11148, 11585, 12040, 12513, 13004, 13515,
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14045, 14596, 15170, 15765, 16384, 17027, 17696, 18390,
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19112, 19863, 20643, 21453, 22295, 23170, 24080, 25025,
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26008, 27029, 28090, 29193, 30339, 31530, 32768
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};
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/*
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* Fake parameters for byte-streams
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*/
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struct aparams aparams_none = { 1, 0, 0, 0, 0, 0, 0, 0 };
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/*
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* Generate a string corresponding to the encoding in par,
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* return the length of the resulting string.
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*/
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int
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aparams_enctostr(struct aparams *par, char *ostr)
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{
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char *p = ostr;
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*p++ = par->sig ? 's' : 'u';
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if (par->bits > 9)
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*p++ = '0' + par->bits / 10;
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*p++ = '0' + par->bits % 10;
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if (par->bps > 1) {
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*p++ = par->le ? 'l' : 'b';
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*p++ = 'e';
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if (par->bps != APARAMS_BPS(par->bits) ||
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par->bits < par->bps * 8) {
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*p++ = par->bps + '0';
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if (par->bits < par->bps * 8) {
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*p++ = par->msb ? 'm' : 'l';
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*p++ = 's';
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*p++ = 'b';
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}
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}
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}
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*p++ = '\0';
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return p - ostr - 1;
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}
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/*
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* Parse an encoding string, examples: s8, u8, s16, s16le, s24be ...
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* set *istr to the char following the encoding. Return the number
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* of bytes consumed.
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*/
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int
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aparams_strtoenc(struct aparams *par, char *istr)
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{
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char *p = istr;
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int i, sig, bits, le, bps, msb;
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#define IS_SEP(c) \
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(((c) < 'a' || (c) > 'z') && \
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((c) < 'A' || (c) > 'Z') && \
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((c) < '0' || (c) > '9'))
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/*
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* get signedness
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*/
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if (*p == 's') {
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sig = 1;
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} else if (*p == 'u') {
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sig = 0;
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} else
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return 0;
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p++;
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/*
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* get number of bits per sample
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*/
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bits = 0;
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for (i = 0; i < 2; i++) {
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if (*p < '0' || *p > '9')
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break;
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bits = (bits * 10) + *p - '0';
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p++;
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}
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if (bits < BITS_MIN || bits > BITS_MAX)
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return 0;
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bps = APARAMS_BPS(bits);
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msb = 1;
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le = NATIVE_LE;
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/*
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* get (optional) endianness
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*/
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if (p[0] == 'l' && p[1] == 'e') {
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le = 1;
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p += 2;
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} else if (p[0] == 'b' && p[1] == 'e') {
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le = 0;
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p += 2;
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} else if (IS_SEP(*p)) {
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goto done;
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} else
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return 0;
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/*
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* get (optional) number of bytes
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*/
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if (*p >= '0' && *p <= '9') {
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bps = *p - '0';
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if (bps < (bits + 7) / 8 ||
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bps > (BITS_MAX + 7) / 8)
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return 0;
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p++;
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/*
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* get (optional) alignement
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*/
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if (p[0] == 'm' && p[1] == 's' && p[2] == 'b') {
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msb = 1;
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p += 3;
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} else if (p[0] == 'l' && p[1] == 's' && p[2] == 'b') {
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msb = 0;
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p += 3;
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} else if (IS_SEP(*p)) {
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goto done;
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} else
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return 0;
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} else if (!IS_SEP(*p))
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return 0;
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done:
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par->msb = msb;
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par->sig = sig;
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par->bits = bits;
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par->bps = bps;
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par->le = le;
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return p - istr;
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}
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/*
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* Initialise parameters structure with the defaults natively supported
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* by the machine.
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*/
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void
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aparams_init(struct aparams *par, unsigned cmin, unsigned cmax, unsigned rate)
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{
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par->bps = 2; /* 2 bytes per sample */
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par->bits = 16; /* 16 significant bits per sample */
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par->sig = 1; /* samples are signed */
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par->le = NATIVE_LE;
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par->msb = 1; /* msb justified */
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par->cmin = cmin;
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par->cmax = cmax;
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par->rate = rate;
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}
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#ifdef DEBUG
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/*
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* Print the format/channels/encoding on stderr.
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*/
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void
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aparams_dbg(struct aparams *par)
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{
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char enc[ENCMAX];
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aparams_enctostr(par, enc);
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dbg_puts(enc);
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dbg_puts(",");
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dbg_putu(par->cmin);
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dbg_puts(":");
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dbg_putu(par->cmax);
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dbg_puts(",");
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dbg_putu(par->rate);
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}
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#endif
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/*
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* Return true if both encodings are the same.
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*/
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int
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aparams_eqenc(struct aparams *par1, struct aparams *par2)
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{
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if (par1->bps != par2->bps ||
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par1->bits != par2->bits ||
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par1->sig != par2->sig)
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return 0;
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if ((par1->bits != 8 * par1->bps) && par1->msb != par2->msb)
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return 0;
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if (par1->bps > 1 && par1->le != par2->le)
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return 0;
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return 1;
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}
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/*
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* Return true if both parameters are the same.
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*/
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int
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aparams_eq(struct aparams *par1, struct aparams *par2)
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{
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if (!aparams_eqenc(par1, par2) ||
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par1->cmin != par2->cmin ||
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par1->cmax != par2->cmax ||
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par1->rate != par2->rate)
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return 0;
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return 1;
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}
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/*
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* Return true if first channel range includes second range.
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*/
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int
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aparams_subset(struct aparams *subset, struct aparams *set)
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{
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return subset->cmin >= set->cmin && subset->cmax <= set->cmax;
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}
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/*
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* Grow channels range and sample rate of ``set'' in order ``subset'' to
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* become an actual subset of it.
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*/
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void
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aparams_grow(struct aparams *set, struct aparams *subset)
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{
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if (set->cmin > subset->cmin)
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set->cmin = subset->cmin;
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if (set->cmax < subset->cmax)
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set->cmax = subset->cmax;
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if (set->rate < subset->rate)
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set->rate = subset->rate;
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}
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/*
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* Return true if rates are the same.
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*/
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int
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aparams_eqrate(struct aparams *p1, struct aparams *p2)
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{
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/* XXX: allow 1/9 halftone of difference */
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return p1->rate == p2->rate;
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}
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/*
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* Return the number of bytes per frame with the given parameters.
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*/
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unsigned
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aparams_bpf(struct aparams *par)
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{
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return (par->cmax - par->cmin + 1) * par->bps;
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}
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void
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aparams_copyenc(struct aparams *dst, struct aparams *src)
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{
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dst->sig = src->sig;
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dst->le = src->le;
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dst->msb = src->msb;
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dst->bits = src->bits;
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dst->bps = src->bps;
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}
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