1、README
a. 编译
$ make # or `make CC=your-corosscompile-gcc`
b. 使用
注意：分离左右声道的前提是输入的PCM文件（数据）是双声道。
$ ./pcm_channels_split
Usage: ./pcm_channels_split in.pcm out_l.pcm out_r.pcm
examples:
./pcm_channels_split ./audio/test_22050_16_2.pcm ./test_22050_16_1-l.pcm ./test_22050_16_1-r.pcm
./pcm_channels_split ./audio/test_44100_16_2.pcm ./test_44100_16_1-l.pcm ./test_44100_16_1-r.pcm
c. 附录（demo目录架构）
.
├── audio
│ ├── test_22050_16_1-l.pcm
│ ├── test_22050_16_1-r.pcm
│ ├── test_22050_16_2.pcm
│ ├── test_44100_16_1-l.pcm
│ ├── test_44100_16_1-r.pcm
│ └── test_44100_16_2.pcm
├── docs
│ └── PCM音频数据 - 简书.mhtml
├── main.c
├── Makefile
└── README.md
2、主要代码片段
main.c
#include <stdio.h>
#include <stdlib.h>
int pcm_s16le_split(const char* file, const char* out_lfile, const char* out_rfile);
int main(int argc, char *argv[])
{
if (argc != 4)
{
printf("Usage: %s in.pcm out_l.pcm out_r.pcm\n", argv[0]);
printf("examples: \n"
"\t %s ./audio/test_22050_16_2.pcm ./test_22050_16_1-l.pcm ./test_22050_16_1-r.pcm\n"
"\t %s ./audio/test_44100_16_2.pcm ./test_44100_16_1-l.pcm ./test_44100_16_1-r.pcm\n",
argv[0], argv[0]);
return -1;
}
/* 注意：分离左右声道的前提是输入的PCM文件（数据）是双声道 */
pcm_s16le_split(argv[1], argv[2], argv[3]);
return 0;
}
int pcm_s16le_split(const char* file, const char* out_lfile, const char* out_rfile)
{
FILE *fp = fopen(file, "rb+");
if (fp == NULL) {
printf("open %s failed\n", file);
return -1;
}
FILE *fp1 = fopen(out_lfile, "wb+");
if (fp1 == NULL) {
printf("open %s failed\n", out_lfile);
return -1;
}
FILE *fp2 = fopen(out_rfile, "wb+");
if (fp2 == NULL) {
printf("open %s failed\n", out_rfile);
return -1;
}
char * sample = (char *)malloc(4);
while(1) {
int readbytes = fread(sample, 1, 4, fp);
if(readbytes <= 0)
{
// 没有数据就不要写了
break;
}
// L
fwrite(sample, 1, 2, fp1);
// R
fwrite(sample + 2, 1, 2, fp2);
}
free(sample);
fclose(fp);
fclose(fp1);
fclose(fp2);
return 0;
}