从 AVI 文件读取流

以下子例程从 AVI 文件获取流信息，并从 AVIStreamInfo 函数返回的 AVISTREAMINFO 结构确定 流类型。

// StreamTypes - opens the streams in an AVI file and determines 
// stream types. 
// 
// Global variables 
// gcpavi - count of streams in an AVI file 
// gapavi[] = array of stream-interface pointers 
 
void StreamTypes(HWND hwnd) 
{ 
    AVISTREAMINFO     avis; 
    LONG    r, lHeight = 0; 
    WORD    w; 
    int     i; 
    RECT    rc; 
 
// Walk through all streams. 
    for (i = 0; i < gcpavi; i++) { 
        AVIStreamInfo(gapavi[i], &avis, sizeof(avis)); 
 
        if (avis.fccType == streamtypeVIDEO) { 
 
        // Place video-processing functions here. 
 
        } 
        else if (avis.fccType == streamtypeAUDIO) { 
 
        // Place audio-processing functions here. 
 
        } 
        else if (avis.fccType == streamtypeTEXT) { 
 
        // Place text-processing functions here. 
 
        } 
    } 
}