You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
2.2 KiB
93 lines
2.2 KiB
//
|
|
// Created by xu fulong on 2022/8/5.
|
|
//
|
|
|
|
#include <cstdio>
|
|
#include <cerrno>
|
|
#include <cstdlib>
|
|
#include <cstring>
|
|
|
|
void pcm_raise_speed(char *input_path, char *output_path)
|
|
{
|
|
FILE *input = fopen(input_path, "rb+");
|
|
FILE *output = fopen(output_path, "wb+");
|
|
if (!input && !output) {
|
|
printf("open file fail, msg=%s\n", strerror(errno));
|
|
return;
|
|
}
|
|
|
|
int count = 0;
|
|
char *buf = (char*) malloc(sizeof(char) * 4);
|
|
while(!feof(input)) {
|
|
fread(buf, sizeof(char), 4, input);
|
|
if (count % 2 == 0) {
|
|
// L
|
|
fwrite(buf, sizeof(char), 2, output);
|
|
// R
|
|
fwrite(buf + 2, sizeof(char), 2, output);
|
|
}
|
|
count++;
|
|
}
|
|
|
|
free(buf);
|
|
fclose(output);
|
|
fclose(input);
|
|
}
|
|
|
|
void pcm_change_volume(char *input_path, char *output_path)
|
|
{
|
|
FILE *input = fopen(input_path, "rb+");
|
|
FILE *output = fopen(output_path, "wb+");
|
|
if (!input && !output) {
|
|
printf("open file fail, msg=%s\n", strerror(errno));
|
|
return;
|
|
}
|
|
|
|
int count = 0;
|
|
char *buf = (char*) malloc(sizeof(char) * 4);
|
|
while(!feof(input)) {
|
|
fread(buf, sizeof(char), 4, input);
|
|
short *left = (short*) buf;
|
|
*left /= 2;
|
|
short *right = (short*) (buf + 2);
|
|
*right /= 2;
|
|
// L
|
|
fwrite(left, sizeof(short), 1, output);
|
|
// R
|
|
fwrite(right, sizeof(short), 1, output);
|
|
count++;
|
|
}
|
|
printf("resample count=%d\n", count);
|
|
|
|
free(buf);
|
|
fclose(output);
|
|
fclose(input);
|
|
}
|
|
|
|
void pcm_split_channel(char *input_path, char *left_path, char *right_path)
|
|
{
|
|
FILE *input = fopen(input_path, "rb+");
|
|
FILE *left = fopen(left_path, "wb+");
|
|
FILE *right = fopen(right_path, "wb+");
|
|
if (!input && !left && !right) {
|
|
printf("open file fail, msg=%s\n", strerror(errno));
|
|
return;
|
|
}
|
|
|
|
int count = 0;
|
|
char *buf = (char*) malloc(sizeof(char) * 4);
|
|
while(!feof(input)) {
|
|
fread(buf, sizeof(char), 4, input);
|
|
// L
|
|
fwrite(buf, sizeof(char), 2, left);
|
|
// R
|
|
fwrite(buf+2, sizeof(char), 2, right);
|
|
count++;
|
|
}
|
|
printf("resample count=%d\n", count);
|
|
|
|
free(buf);
|
|
fclose(left);
|
|
fclose(right);
|
|
fclose(input);
|
|
} |