压缩数据
[与此页面关联的功能 视频压缩管理器是一项旧功能。 Microsoft 强烈建议新代码不使用此功能。]
以下示例压缩图像数据,以便在 AVI 文件中使用。 它假定压缩器不支持VIDCF_CRUNCH或VIDCF_TEMPORAL标志,但它支持VIDCF_QUALITY。 该示例使用 ICCompressBegin 宏、 ICCompress 函数和 ICCompressEnd 宏。
DWORD dwCkID;
DWORD dwCompFlags;
DWORD dwQuality;
LONG lNumFrames, lFrameNum;
// Assume dwNumFrames is initialized to the total number of frames.
// Assume dwQuality holds the proper quality value (0-10000).
// Assume lpbiOut, lpOut, lpbiIn, and lpIn are initialized properly.
// If OK to start, compress each frame.
if (ICCompressBegin(hIC, lpbiIn, lpbiOut) == ICERR_OK)
{
for ( lFrameNum = 0; lFrameNum < lNumFrames; lFrameNum++)
{
if (ICCompress(hIC, 0, lpbiOut, lpOut, lpbiIn, lpIn,
&dwCkID, &dwCompFlags, lFrameNum,
0, dwQuality, NULL, NULL) == ICERR_OK)
{
// Write compressed data to the AVI file.
// Set lpIn to the next frame in the sequence.
}
else
{
// Handle compressor error.
}
}
ICCompressEnd(hIC); // terminate compression
}
else
{
// Handle the error identifying the unsupported format.
}