subject_49290.htm

一些关于vc的问答

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序号：49290 发表者：成商 发表日期：2003-08-08 18:35:58
<br>主题：directdraw 中显示YUV4：2：0图像遇到的问题
<br>内容：本人想用directdraw显示解码的mpeg-4视频，解码结果为YV12的YUV格式（4：2：0），大致代码如下，想用directdraw直接显示YUV格式<BR><BR>#define FOURCC_YV12 0x32315659<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;ZeroMemory( &amp;ddsd, sizeof(ddsd) );<BR>&nbsp;&nbsp;&nbsp;&nbsp;ddsd.dwSize&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; = sizeof(ddsd);<BR>&nbsp;&nbsp;&nbsp;&nbsp;ddsd.dwFlags&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;= DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH ;<BR>&nbsp;&nbsp;&nbsp;&nbsp;ddsd.ddsCaps.dwCaps = DDSCAPS_OVERLAY | DDSCAPS_VIDEOMEMORY ;<BR>&nbsp;&nbsp;&nbsp;&nbsp;ddsd.dwWidth&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;= dwDesiredWidth;<BR>&nbsp;&nbsp;&nbsp;&nbsp;ddsd.dwHeight&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; = dwDesiredHeight;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;ddsd.dwFlags&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |= DDSD_PIXELFORMAT ;<BR>&nbsp;&nbsp;&nbsp;&nbsp;ddsd.ddpfPixelFormat.dwSize&nbsp;&nbsp;&nbsp;&nbsp;=&nbsp;&nbsp;sizeof(DDPIXELFORMAT);<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;ddsd.ddpfPixelFormat.dwFlags&nbsp;&nbsp; =&nbsp;&nbsp;DDPF_FOURCC&nbsp;&nbsp;;<BR>&nbsp;&nbsp;&nbsp;&nbsp;ddsd.ddpfPixelFormat.dwFourCC&nbsp;&nbsp;=&nbsp;&nbsp;FOURCC_YV12;<BR><BR>当createsurface 的时候返回错误 “0x88760091” “DDERR_INVALIDPIXELFORMAT”<BR><BR>若将DDSCAPS_VIDEOMEMORY 改为 DDSCAPS_SYSTEMMEMORY 则错误变为“0x88760104”，顺便问一下如何查找该代码的意思呢。用了<BR>_com_error e(hr);<BR>const char *hrerr=e.ErrorMessage();<BR>结果hrerr＝"unknown error";<BR><BR>被这个问题纠缠几天了，望高手指点一下。。。<BR>
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<font color=red>答案被接受</font><br>回复者：微笑的撒旦 回复日期：2003-08-10 21:17:15
<br>内容：SDK中有一个Directx error lookup 的程序，你这个错误是<BR>HRESULT: 0x88760104 (2289434884)<BR>Name: DDERR_NOOVERLAYHW<BR>Description: Operation could not be carried out because there is no overlay hardware present or available.<BR>Severity code: Failed<BR>Facility Code: Unknown (2166)<BR>Error Code: 0x0104 (260)
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