实现分离YUV420P像素数据中的Y、U、V分量。
commit
a70f0e8d5a
|
@ -0,0 +1,28 @@
|
|||
# 视音频数据处理入门
|
||||
|
||||
<br />
|
||||
|
||||
|
||||
## 分离YUV420P像素数据中的Y、U、V分量
|
||||
|
||||
yuv视频下载:http://trace.eas.asu.edu/yuv/
|
||||
yuv播放器:(修改了一个YUV/RGB播放器)http://blog.csdn.net/leixiaohua1020/article/details/50466201
|
||||
|
||||
yuv420_split.cpp 程序中的函数可以将YUV420P数据中的Y、U、V三个分量分离开来并保存成三个文件。
|
||||
|
||||
调用方法:
|
||||
./yuv420_split lena_256x256_yuv420p.yuv 256 256
|
||||
|
||||
如果视频帧的宽和高分别为w和h,那么一帧YUV420P像素数据一共占用w*h*3/2 Byte的数据。其中前w*h Byte存储Y,接着的w*h*1/4 Byte存储U,最后w*h*1/4 Byte存储V。上述调用函数的代码运行后,将会把一张分辨率为256x256的名称为lena_256x256_yuv420p.yuv的YUV420P格式的像素数据文件分离成为三个文件:<br />
|
||||
output_420_y.y:纯Y数据,分辨率为256x256。<br />
|
||||
output_420_u.y:纯U数据,分辨率为128x128。<br />
|
||||
output_420_v.y:纯V数据,分辨率为128x128。<br />
|
||||
|
||||
注:<br />
|
||||
本文中像素的采样位数一律为8bit。由于1Byte=8bit,所以一个像素的一个分量的采样值占用1Byte。<br />
|
||||
输出的U、V分量在YUV播放器中也是当做Y分量进行播放的。<br />
|
||||
|
||||
<br />
|
||||
|
||||
|
||||
##
|
Binary file not shown.
File diff suppressed because one or more lines are too long
|
@ -0,0 +1,47 @@
|
|||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
|
||||
typedef int BOOL;
|
||||
#define TRUE 1
|
||||
#define FALSE 0
|
||||
|
||||
BOOL yuv420_split(const char *file, int width, int height)
|
||||
{
|
||||
if (file == NULL) {
|
||||
return FALSE;
|
||||
}
|
||||
FILE *fp = fopen(file, "rb+");
|
||||
|
||||
FILE *fp0 = fopen("output_420_yuv.y", "wb+");
|
||||
FILE *fp1 = fopen("output_420_y.y", "wb+");
|
||||
FILE *fp2 = fopen("output_420_u.y", "wb+");
|
||||
FILE *fp3 = fopen("output_420_v.y", "wb+");
|
||||
|
||||
unsigned char *data = (unsigned char *)malloc(width*height*3/2);
|
||||
memset(data, 0, width*height*3/2);
|
||||
|
||||
fread(data, 1, width*height*3/2, fp);
|
||||
|
||||
fwrite(data, 1, width*height*3/2, fp0);
|
||||
fwrite(data, 1, width*height, fp1);
|
||||
fwrite(data+width*height, 1, width*height/4, fp2);
|
||||
fwrite(data+width*height*5/4, 1, width*height/4, fp3);
|
||||
|
||||
free(data);
|
||||
fclose(fp);
|
||||
fclose(fp1);
|
||||
fclose(fp2);
|
||||
fclose(fp3);
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
if (argc == 4) {
|
||||
yuv420_split(argv[1], atoi(argv[2]), atoi(argv[3]));
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
Loading…
Reference in New Issue