mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-05-17 11:00:08 +00:00
394d998315
At least in neovim, `│vi:` is not recognized as a modeline because it has no preceding whitespace. After fixing this, opening a file yields an error because `net` is not an option. (`noet`, however, is.)
45 lines
2.3 KiB
C
45 lines
2.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set noet ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2021 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or 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 "dsp/core/core.h"
|
|
|
|
/**
|
|
* Compresses 16-bit signed linear audio sample with a-Law.
|
|
*
|
|
* @param x is clamped to 16-bits of which the top 14 are considered
|
|
* @return coded number in range [0..255]
|
|
* @see ITU G.711
|
|
*/
|
|
int alaw(int x) {
|
|
int a, b, i;
|
|
if ((a = x) < 0) a = ~a;
|
|
a >>= 4;
|
|
if (a > 15) {
|
|
if ((i = a >> 5)) {
|
|
b = (__builtin_clz(i) ^ 31) + 1;
|
|
a >>= b;
|
|
a -= 16;
|
|
a += (b + 1) << 4;
|
|
} else {
|
|
a -= 16;
|
|
a += 16;
|
|
}
|
|
}
|
|
if (x >= 0) a |= 128;
|
|
return a ^ 85;
|
|
}
|