42 lines
2.5 KiB
C
42 lines
2.5 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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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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