我正在使用这个库https://github.com/ahawker/NLibsndfile来将音频文件从C#转换为libSndFile,我编写了以下方法进行转换(将wav文件转换为aiff):
问题在于打开AIFF文件时,方法
string sourcePath = "/User/Dev/Desktop/a.wav";
string targetPath = "/User/Dev/Desktop/b.aiff";
var file = File.Create(targetPath);
file.Close();
file.Dispose();
IntPtr ptrTargetFile = file.SafeFileHandle.DangerousGetHandle();
LibsndfileInfo wavInfo = new LibsndfileInfo();
LibsndfileInfo aiffInfo = new LibsndfileInfo();
LibsndfileApi api = new LibsndfileApi();
var wavFile = api.Open(sourcePath, LibsndfileMode.Read, ref wavInfo);
var aiffFile = api.OpenFileDescriptor((int)ptrTargetFile, LibsndfileMode.Rdwr, ref aiffInfo, 0);
aiffInfo.Channels = wavInfo.Channels;
aiffInfo.SampleRate = wavInfo.SampleRate;
aiffInfo.Format = LibsndfileFormat.Aiff;
short[] buffer = new short[512];
long countOfItemsWritten = 0;
long countOfItemsReaded = 0;
while ((countOfItemsReaded=api.ReadItems(wavFile, buffer, buffer.Length))>0)
countOfItemsWritten = api.WriteItems(aiffFile, buffer, countOfItemsReaded);
api.Close(wavFile);
api.Close(aiffFile);
问题在于打开AIFF文件时,方法
api.OpenFileDescriptor
总是返回空指针。库方法如下:internal static extern IntPtr sf_open_fd(int handle, LibsndfileMode mode, ref LibsndfileInfo info, int closeHandle);
有任何想法为什么操作失败?或者如何从FileStream中获取文件描述符处理程序?