在网上找了一段代码，能工作，但是颜色不对，红的变成蓝色的，黄的变青色了，有时间找找问题。
这个问题在我初学DirectX是困惑了我很久，贴出来为初学者提供一个参考。
#include "ddraw.h"
#pragma comment(lib,"ddraw.lib")
#define FILE_HEIGHT 288
#define FILE_WIDTH 352
#define DRAW_TOP 0
#define DRAW_LEFT 0
#define DRAW_HEIGHT 288
#define DRAW_WIDHT 352
BOOL DrawYV12(HWND hWnd)
{
LPDIRECTDRAW lpDD; // DirectDraw 对象指针
LPDIRECTDRAWSURFACE lpDDSPrimary; // DirectDraw 主表面指针
LPDIRECTDRAWSURFACE lpDDSOffScr; // DirectDraw 离屏表面指针
DDSURFACEDESC ddsd; // DirectDraw 表面描述
RECT rctDest; // 目标区域
RECT rctSour; // 源区域
HRESULT ddRval; // DirectDraw 函数返回值
// 创建DirectCraw对象
if (DirectDrawCreate(NULL, &lpDD, NULL) != DD_OK)
return FALSE;
// 设置协作层
if (lpDD->SetCooperativeLevel(hWnd,
DDSCL_NORMAL | DDSCL_NOWINDOWCHANGES) != DD_OK)
return FALSE;
// 创建主表面
ZeroMemory(&ddsd, sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_CAPS;
ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE;
if (lpDD->CreateSurface(&ddsd, &lpDDSPrimary, NULL) != DD_OK)
return FALSE;
// 创建离屏表面对象
ZeroMemory(&ddsd, sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);
ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN | DDSCAPS_VIDEOMEMORY; //DDSCAPS_OVERLAY
DDSCAPS_OFFSCREENPLAIN;
ddsd.dwFlags = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT;
ddsd.dwWidth = DRAW_WIDHT;
ddsd.dwHeight = DRAW_HEIGHT;
ddsd.ddpfPixelFormat.dwSize = sizeof(DDPIXELFORMAT);
ddsd.ddpfPixelFormat.dwFlags = DDPF_FOURCC | DDPF_YUV ;
ddsd.ddpfPixelFormat.dwFourCC = MAKEFOURCC('Y','V','1','2');
ddsd.ddpfPixelFormat.dwYUVBitCount = 8;
if (lpDD->CreateSurface(&ddsd, &lpDDSOffScr, NULL) != DD_OK)
return FALSE;
// 加载yv12图像文件
FILE * f = fopen("test.yv12","rb");
LPBYTE lpYV12 = new BYTE[FILE_WIDTH * FILE_HEIGHT * 3 / 2];
UINT iLen = fread(lpYV12, 1, FILE_WIDTH * FILE_HEIGHT * 3 / 2, f);
fclose(f);
LPBYTE lpY = lpYV12;
LPBYTE lpV = lpYV12 + FILE_WIDTH * FILE_HEIGHT;
LPBYTE lpU = lpYV12 + FILE_WIDTH * FILE_HEIGHT * 5 / 4;
ddRval = lpDDSOffScr->Lock(NULL,&ddsd,DDLOCK_WAIT | DDLOCK_WRITEONLY,NULL);
while(ddRval == DDERR_WASSTILLDRAWING);
if(ddRval != DD_OK)
return FALSE;
LPBYTE lpSurf = (LPBYTE)ddsd.lpSurface;
LPBYTE lpY1 = lpSurf;
LPBYTE lpV1 = lpSurf + ddsd.lPitch * FILE_HEIGHT;
LPBYTE lpU1 = lpV1 + ddsd.lPitch * FILE_HEIGHT / 4;
int nOffset = DRAW_TOP*FILE_WIDTH+DRAW_LEFT;
// 填充离屏表面
if(lpSurf)
{
int i = 0;
// fill Y data
lpY += nOffset;
for(i=0; i<ddsd.dwHeight; i++)
{
memcpy(lpSurf, lpY, ddsd.dwWidth);
lpY += FILE_WIDTH;
lpSurf += ddsd.lPitch;
}
// fill V data
lpV += DRAW_TOP * FILE_WIDTH / 4 + DRAW_LEFT / 2;
for(i=0; i<ddsd.dwHeight/2; i++)
{
memcpy(lpSurf, lpV, ddsd.dwWidth / 2);
lpV += FILE_WIDTH / 2;
lpSurf += ddsd.lPitch / 2;
}
// fill U data
lpU += DRAW_TOP * FILE_WIDTH / 4 + DRAW_LEFT / 2;
for(i=0; i<ddsd.dwHeight/2; i++)
{
memcpy(lpSurf, lpU, ddsd.dwWidth / 2);
lpU += FILE_WIDTH / 2;
lpSurf += ddsd.lPitch / 2;
}
}
lpDDSOffScr->Unlock(NULL);
delete lpYV12;
// Blt到主表面上
rctSour.left = 0;
rctSour.top = 0;
rctSour.right = ddsd.dwWidth;
rctSour.bottom = ddsd.dwHeight;
GetClientRect(hWnd,&rctDest);
ClientToScreen(hWnd, (LPPOINT)&rctDest.left);
ClientToScreen(hWnd, (LPPOINT)&rctDest.right);
ddRval = lpDDSPrimary->Blt(&rctDest, lpDDSOffScr, &rctSour, DDBLT_WAIT, NULL);
while(ddRval == DDERR_WASSTILLDRAWING);
if(ddRval != DD_OK)
return FALSE;
// 释放DirectDraw对象
if(lpDD != NULL)
{
if(lpDDSPrimary != NULL)
{
lpDDSPrimary->Release();
lpDDSPrimary = NULL;
}
if(lpDDSOffScr != NULL)
{
lpDDSOffScr->Release();
lpDDSOffScr = NULL;
}
lpDD->Release();
lpDD = NULL;
}
return TRUE;
}