41 lines
2.4 KiB
C
41 lines
2.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above 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 │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/limits.h"
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#include "libc/macros.h"
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#include "libc/math.h"
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#include "libc/str/str.h"
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/**
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* Converts floating point audio samples to pulse code modulation.
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*
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* @param rdi is number of sample chunks
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* @param rsi points to aligned pcm [-32k,+32k] output memory
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* @param rdx points to aligned float32 [-1,+1] input memory
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*/
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void float2short(size_t n, short pcm16[n][8], const float binary32[n][8]) {
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size_t i, j;
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float f[8], w[8];
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for (i = 0; i < n; ++i) {
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for (j = 0; j < 8; ++j) {
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pcm16[i][j] =
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MIN(SHRT_MAX, MAX(SHRT_MIN, floorf(binary32[i][j] * (SHRT_MAX + 1))));
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}
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}
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}
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