1、README
a. 编译
bash
$ make # or `make CC=your-corosscompile-gcc`b. 使用
合并两个声道成为双声道，例如：
bash
$ ./pcm_channel_merge ./audio/test_22050_16_1-l.pcm ./audio/test_22050_16_1-r.pcm out_44100_16_2.pcm
$ ./pcm_channel_merge ./audio/test_44100_16_1-l.pcm ./audio/test_44100_16_1-r.pcm out_44100_16_2.pcmc. demo目录架构
bash
.
├── 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.md2、主要代码片段
main.c
c
#include <stdio.h>
#include <stdlib.h>
int pcm_s16le_merge(const char* in_lfile, const char* in_rfile, const char* file);
int main(int argc, char *argv[])
{
if (argc != 4)
{
printf("Usage: %s in-channel-l.pcm in-channel-r.pcm out-channels-merge.pcm\n", argv[0]);
printf("such as:\n"
"\t %s ./audio/test_22050_16_1-l.pcm ./audio/test_22050_16_1-r.pcm out_22050_16_2.pcm\n"
"\t %s ./audio/test_44100_16_1-l.pcm ./audio/test_44100_16_1-r.pcm out_44100_16_2.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_merge(argv[1], argv[2], argv[3]);
return 0;
}
int pcm_s16le_merge(const char* in_lfile, const char* in_rfile, const char* out_file)
{
FILE *fp1 = fopen(in_lfile, "rb+");
if (fp1 == NULL) {
printf("open %s failed\n", in_lfile);
return -1;
}
FILE *fp2 = fopen(in_rfile, "rb+");
if (fp2 == NULL) {
printf("open %s failed\n", in_rfile);
return -1;
}
FILE *fp = fopen(out_file, "wb+");
if (fp == NULL) {
printf("open %s failed\n", out_file);
return -1;
}
char * sample = (char *)malloc(4);
while(1) {
int readbytes = 0;
// L
readbytes += fread(sample, 1, 2, fp1);
// R
readbytes += fread(sample + 2, 1, 2, fp2);
if(readbytes == 0)
{
// 没有数据就不要再写入到输出文件中了
break;
}
fwrite(sample, 1, 4, fp);
}
free(sample);
fclose(fp);
fclose(fp1);
fclose(fp2);
return 0;
}