C++处理YUV格式视频【帧平均法】

1.原理图

2.处理函数，

class YuvOperationtwo {public:void averageFrame(int totalPix,unsigned char* before_data, unsigned char* write_data, unsigned char* after_data);};
void YuvOperationtwo::averageFrame(int totalPix,unsigned char* before_frame, unsigned char* write_frame, unsigned char* after_frame) {//前一帧，写入帧，后一帧的活动指针unsigned char* activity_before_frame = before_frame;unsigned char* w_write_frame = write_frame;unsigned char* activity_after_frame = after_frame;for (int j = 1; j <= totalPix; j++) {//除2是因为d1与d2相同*w_write_frame = *activity_before_frame / 2 + *activity_after_frame / 2;w_write_frame++;activity_before_frame++;activity_after_frame++;}
}

调用

const char* inPath = "D:\\YUM\\experiment three\\RaceHorses_416x240_30.yuv";const char* outOddPath = "D:\\YUM\\experiment three\\RaceHorses_416x240_30_odd.yuv";FILE* fin = fopen(inPath, "rb+");if (!fin) {cout << "Open file failed!" << endl;return -1;}FILE* fout = fopen(outOddPath, "a");if (!fout) {cout << "Open file failed!" << endl;return -1;}int width = 416;int height = 240; int totalPix = int(width * height * 1.5);//每帧像素个数为416×240，420视频序列yuv每个像素占用1.5byte的像素空间。int nFrame, size;fseek(fin, 0, SEEK_END);   //将文件指针移到文件末尾，偏移0个字节；fseek(fp,50L,0)；或fseek(fp,50L,SEEK_SET);解释：其作用是将位置指针移到离文件头50个字节处size = ftell(fin);     //得到文件尾相对于文件首的位移，即文件的总字节数rewind(fin);       //重置文件指针指向文件头部nFrame = size / totalPix; //得到视频文件的总帧数cout << "视频总帧数：" << nFrame << endl;//这里只能用unsigned char 不能用char。unsigned char* before_frame = new unsigned char[totalPix]();      //前一帧unsigned char* write_frame = new unsigned char[totalPix]();       //预测帧unsigned char* after_frame = new unsigned char[totalPix]();       //后一帧//nFrame可理解为生成的帧数，10--》生成10帧for (int frame = 0; frame < nFrame; frame++) {//读取1-2-3。。。帧fread(before_frame, 1, totalPix, fin);     //读取2-3-4。。。帧fread(after_frame, 1, totalPix, fin);//第二次读取时候文件指针移动到第2帧处，需要向后移动一帧大小的位数fseek(fin, -totalPix, SEEK_CUR); YuvOperationtwo y;y.averageFrame(totalPix, before_frame, write_frame, after_frame);fwrite(write_frame, 1, totalPix, fout);}fclose(fin);fclose(fout);system("pause");return 0;

踩坑1

unsigned char 和 char的区别：

虽然都是占用1个字节，8位，且都能表示256个数字，但是char表示的范围为-128~127，而unsigned char表示的范围为0-255。在读取yuv二进制文件时候出现单个位数大于127的情况，就会导致出问题。如
unsigned char uc=255; char c=255; printf("%d %d",uc,c); 结果为: 255 -1
因为char类型表示有符号数，而二进制中最高位表示正负，255二进制表示为11111111在计算机内进行存储，为补码形式，转化为原码即为-1。

踩坑2

在进行测试不使用函数的情况下，活动指针必须要放在循环体里边，不能放在循环体外部。

踩坑3

在仅处理1，2帧得到1和2之间的插入帧时候也要使用中间指针，不能使用原定义的数组，这里不是多清楚原因，从java到c++底子太弱了。

分开处理YUV的写法

1.函数

class YuvOperationtwo {public:void averageFrameYuv(int width, int hegith,unsigned char* before_y_read_data, unsigned char* before_u_read_data, unsigned char* before_v_read_data, unsigned char* y_write_data, unsigned char* u_write_data, unsigned char* v_write_data, unsigned char* after_y_read_data, unsigned char* after_u_read_data, unsigned char* after_v_read_data);
};void YuvOperationtwo::averageFrameYuv(int width,int hegith,unsigned char* before_y_read_data, unsigned char* before_u_read_data, unsigned char* before_v_read_data, unsigned  char* y_write_data, unsigned  char*u_write_data, unsigned  char* v_write_data, unsigned char* after_y_read_data, unsigned char* after_u_read_data, unsigned  char* after_v_read_data) {//前一帧的yuv--游标指针unsigned char* read_before_y = before_y_read_data;unsigned char* read_before_u = before_u_read_data;unsigned char* read_before_v = before_v_read_data;//后一帧的yuv--游标指针unsigned char* read_after_y = after_y_read_data;unsigned char* read_after_u = after_u_read_data;unsigned char* read_after_v = after_v_read_data;//要写入的yuvunsigned char* write_img_y = y_write_data;unsigned char* write_img_u = u_write_data;unsigned char* write_img_v = v_write_data;int yWidth = width;int yHeight = hegith;int uvWidth = width / 2;int uvHeight = hegith / 2;int i = 0, j = 0;//对Y分量进行前后平均预测for (i = 0; i < yHeight; i++) {for (j = 0; j < yWidth; j++) {*write_img_y = *read_before_y / 2 + *read_after_y / 2;write_img_y++;read_before_y++;read_after_y++;}}//对UV分量进行前后预测for (i = 0; i < uvHeight; i++) {for (j = 0; j < uvWidth; j++) {*write_img_u = *read_before_u / 2 + *read_after_u / 2;write_img_u++;read_before_u++;read_after_u++;*write_img_v = *read_before_v / 2 + *read_after_v / 2;write_img_v++;read_before_v++;read_after_v++;}}

主函数

const char* inPath = "D:\\YUM\\experiment three\\RaceHorses_416x240_30.yuv";const char* outOddPath = "D:\\YUM\\experiment three\\RaceHorses_416x240_30_odd.yuv";FILE* fin = fopen(inPath, "rb+");if (!fin) {cout << "Open file failed!" << endl;return -1;}FILE* fout = fopen(outOddPath, "a");if (!fout) {cout << "Open file failed!" << endl;return -1;}int width = 416;int height = 240;int totalSize = width * height;int nFrame = 0, fileTotalSize = 0;int totalPix = int(width * height * 1.5);//每帧像素个数为416×240，420视频序列yuv每个像素占用1.5byte的像素空间。unsigned char* before_frame_y = new unsigned  char[totalSize]();unsigned char* before_frame_u = new unsigned char[totalSize / 4]();unsigned char* before_frame_v = new unsigned char[totalSize / 4]();unsigned char* write_frame_y = new unsigned char[totalSize]();unsigned char* write_frame_u = new unsigned char[totalSize / 4]();unsigned char* write_frame_v = new unsigned char[totalSize / 4]();unsigned char* after_frame_y = new unsigned char[totalSize]();unsigned char* after_frame_u = new unsigned char[totalSize / 4]();unsigned char* after_frame_v = new unsigned char[totalSize / 4]();for (int frame = 0; frame < 10; frame++) {fread(before_frame_y, totalSize, 1, fin);fread(before_frame_u, totalSize/4, 1, fin);fread(before_frame_v, totalSize/4, 1, fin);fread(after_frame_y, totalSize, 1, fin);fread(after_frame_u, totalSize / 4, 1, fin);fread(after_frame_v, totalSize / 4, 1, fin);fseek(fin, -totalPix, SEEK_CUR);YuvOperationtwo y;y.averageFrameYuv(width, height, before_frame_y, before_frame_u, before_frame_v,write_frame_y, write_frame_u, write_frame_v, after_frame_y, after_frame_u, after_frame_v);fwrite(write_frame_y, totalSize, 1, fout);fwrite(write_frame_u, totalSize / 4, 1, fout);fwrite(write_frame_v, totalSize / 4, 1, fout);}fclose(fin);fclose(fout);system("pause");return 1;

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C++处理YUV格式视频【帧平均法】

踩坑1

踩坑2

踩坑3

分开处理YUV的写法

C++处理YUV格式视频【帧平均法】相关推荐

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