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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
float *read_raw(const char *filename, size_t *frames)
{
struct stat st;
int16_t *buf;
size_t f, n;
int fd;
float *data;
int i;
if (stat(filename, &st) < 0) {
fprintf(stderr, "cannot stat file %s\n", filename);
return NULL;
}
fd = open(filename, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "cannot open file %s\n", filename);
return NULL;
}
f = st.st_size / 4;
n = f * 4;
buf = (int16_t *)malloc(n);
if (read(fd, buf, n) != n) {
fprintf(stderr, "short read %zu\n", n);
free(buf);
return NULL;
}
close(fd);
/* deinterleave and convert to float */
data = (float *)malloc(sizeof(float) * f * 2);
for (i = 0; i < f; i++) {
data[i] = buf[2 * i] / 32768.0f;
data[i + f] = buf[2 * i + 1] / 32768.0f;
}
free(buf);
*frames = f;
return data;
}
static int16_t f2s16(float f)
{
int i;
f *= 32768;
i = (int)((f > 0) ? (f + 0.5f) : (f - 0.5f));
if (i < -32768)
i = -32768;
else if (i > 32767)
i = 32767;
return (int16_t)i;
}
int write_raw(const char *filename, float *input, size_t frames)
{
int16_t *buf;
int rc = -1;
int n = frames * 4;
int i;
buf = (int16_t *)malloc(n);
for (i = 0; i < frames; i++) {
buf[2 * i] = f2s16(input[i]);
buf[2 * i + 1] = f2s16(input[i + frames]);
}
int fd = open(filename, O_WRONLY | O_CREAT, 0644);
if (fd < 0) {
fprintf(stderr, "cannot open file %s\n", filename);
goto quit;
}
if (write(fd, buf, n) != n) {
fprintf(stderr, "short write file %s\n", filename);
goto quit;
}
rc = 0;
quit:
close(fd);
free(buf);
return rc;
}
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