TGA文件转YUV文件

文件头

#include "pch.h"
#include <iostream>
#include <cstdio>
#include <fstream>
#include <windows.h>
#include <malloc.h>
#include <stdlib.h>
using namespace std;

TGA结构体

typedef struct _TgaHeader
{BYTE IDLength;       BYTE ColorMapType;
BYTE ImageType;      }TGAHEAD;typedef struct _TgaHeaderCMap
{
WORD CMapStart;
WORD CMapLength;
BYTE CMapDepth;
}TGAHEADCMAP;typedef struct _TgaHeaderImage
{
WORD XOffset;
WORD YOffset;
WORD Width;
WORD Height;
BYTE PixelDepth;
BYTE ImageDescriptor;
}TGAHEADIMG;

打开文件

int main()
{
FILE *TgaFile = NULL, *YuvFile = NULL, *RgbFile = NULL;
if ((TgaFile = fopen("D:\\数据压缩\\16.tga", "rb")) == NULL)
{
printf("tga file open failed!");
exit(0);
}
if ((YuvFile = fopen("D:\\数据压缩\\16.yuv", "wb")) == NULL)
{
printf("yuv file  open failed!");
exit(0);
}

TGAHEAD tga_header;
TGAHEADCMAP tga_header_cmap;
TGAHEADIMG tga_header_img;
fread(&tga_header, 3, 1, TgaFile);
fread(&tga_header_cmap, 5, 1, TgaFile);
fread(&tga_header_img, 10, 1, TgaFile);
unsigned char* ImageData = NULL;
unsigned char* b = NULL;
unsigned char* g = NULL;
unsigned char* r = NULL;
unsigned char* R = NULL;
unsigned char* G = NULL;
unsigned char* B = NULL;
unsigned char* Y = NULL;
unsigned char* U = NULL;
unsigned char* V = NULL;
unsigned char* u = NULL;
unsigned char* v = NULL;
unsigned char* RGB = NULL;
unsigned char* YUV = NULL;

颜色表部分

if (tga_header.ColorMapType == 0)//不带颜色表
{if (tga_header.ImageType == 0)exit(0);else if (tga_header.ImageType == 2)//未压缩的真彩色图像{int depth = tga_header_img.PixelDepth;int width = tga_header_img.Width;int height = tga_header_img.Height;int size = width * height * depth / 8;//整个图像块的大小cout << "该文件是未压缩的真彩色图像" << endl;cout << "图像分辨率为" << width << "×" << height << endl;cout << "像素深度为" << depth << "bit" << endl;ImageData = new unsigned char[size];fread(ImageData, 1, size, TgaFile);b = (unsigned char *)malloc(sizeof(char)*(width * height));g = (unsigned char *)malloc(sizeof(char)*(width * height));r = (unsigned char *)malloc(sizeof(char)*(width * height));R = (unsigned char *)malloc(sizeof(char)*(width * height));G = (unsigned char *)malloc(sizeof(char)*(width * height));B = (unsigned char *)malloc(sizeof(char)*(width * height));Y = (unsigned char *)malloc(sizeof(char)*(width * height));U = (unsigned char *)malloc(sizeof(char)*(width * height));V = (unsigned char *)malloc(sizeof(char)*(width * height));u = (unsigned char *)malloc(sizeof(char)*(width * height / 4));v = (unsigned char *)malloc(sizeof(char)*(width * height / 4));RGB = new unsigned char[width * height * 3];

打开16位的TGA

 if (tga_header_img.PixelDepth == 16)*/{for (int j = 0, i = 0; i < width * height; i++){{b[i] = (ImageData[j] & 0x1F) << 3;g[i] = ((ImageData[j + 1] & 0x03) << 6) + ((ImageData[j] & 0xE0) >> 2);r[i] = ((ImageData[j + 1] & 0x7C)) << 1;j = j + 2;}}}for (int k = 0, i = height - 1; i >= 0; i--){for (int j = 0; j < width; j++){RGB[k] = b[j + i * width];RGB[k + 1] = g[j + i * width];RGB[k + 2] = r[j + i * width];k = k + 3;}}for (int i = 0, j = 0; i < width*height * 3; i = i + 3, j++){R[j] = RGB[i + 2];G[j] = RGB[i + 1];B[j] = RGB[i];}

计算YUV分量

 for (int i = 0, j = 0; i < width*height; i++, j++){Y[j] = 0.2990*R[i] + 0.5870*G[i] + 0.1140*B[i];U[j] = -0.1684*R[i] - 0.3316*G[i] + 0.5*B[i] + 128;V[j] = 0.5*R[i] - 0.4187*G[i] - 0.0813*B[i] + 128;}

对UV下采样

 for (int k = 0, i = 0; i < height; i = i + 2){for (int j = 0; j < width; j = j + 2){u[k] = (U[width*i + j] + U[width*i + j + 1] + U[(i + 1)*width + j] + U[(i + 1)*width + j + 1]) / 4;v[k] = (V[width*i + j] + V[width*i + j + 1] + V[(i + 1)*width + j] + V[(i + 1)*width + j + 1]) / 4;k++;}}

YUV量化后码电平分配

 for (int k = 0; k < width*height; k++){if (Y[k] > 235)Y[k] = 235;if (Y[k] < 16)Y[k] = 16;}for (int k = 0; k < width*height / 4; k++){if (u[k] > 240)u[k] = 240;if (u[k] < 16)u[k] = 16;if (v[k] > 240)v[k] = 240;if (v[k] < 16)v[k] = 16;}fwrite(Y, 1, width*height, YuvFile);fwrite(u, 1, width*height / 4, YuvFile);fwrite(v, 1, width*height / 4, YuvFile);
}}
else
exit(0);

最后得到

原TGA图

目测没有原图清楚

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