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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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dsp/core/float2short.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/limits.h"
#include "libc/macros.h"
#include "libc/math.h"
#include "libc/str/str.h"
/**
* Converts floating point audio samples to pulse code modulation.
*
* @param rdi is number of sample chunks
* @param rsi points to aligned pcm [-32k,+32k] output memory
* @param rdx points to aligned float32 [-1,+1] input memory
*/
void float2short(size_t n, short pcm16[n][8], const float binary32[n][8]) {
size_t i, j;
float f[8], w[8];
for (i = 0; i < n; ++i) {
for (j = 0; j < 8; ++j) {
pcm16[i][j] =
MIN(SHRT_MAX, MAX(SHRT_MIN, floorf(binary32[i][j] * (SHRT_MAX + 1))));
}
}
}