如何正确地将Texture2D保存到MediaLibrary wp7

Question

The problem is in method Texture2D.SaveAsPng . I recently found out memory leak in this method in similar problem but managed to solve it. But I can't fit that solution here. What I'm trying now is:

        MediaLibrary library = new MediaLibrary();
        MemoryStream ms = new MemoryStream();
        pic.SaveAsJpeg(ms, pic.Width, pic.Height);
        ms.Seek(0, SeekOrigin.Begin);
        library.SavePicture(path, ms);
        ms.Close();

And, every call I lose about 4mb of memory (texture dimension 800x620). I have tried to create MemoryStream from byte array but it throws Value does not fall within the expected range exception.

        byte[] textureData = new byte[4 * picHeight * picWidth];
        pic.GetData(textureData);
        library.SavePicture(path, textureData); //exception on this line

So, I guess, I need to convert Texture2D in byte array so that library.SavePicture(path, ms) won't throw exception, but I have no clue how to do that. Any help would be appreciated.

Note: memory leak in Texture2D.SaveAsJpeg occurs only on windows phone 7.

Upd: Memory stream length created from byte array from Texture.GetData is 1984000, when length of memory stream from Texture2D.SaveAsJpeg is 141520.

Answer 1

I don't understand why you copied texture pic data in textureData but you never use it.
Maybe you need to do:

byte[] textureData = new byte[4 * picHeight * picWidth];
pic.GetData(textureData);
library.SavePicture(path, textureData); 

UPDATE

According to MSDN for MediaLibrary.SavePicture :

Image data that is passed in must be in a JPEG file format. Additionally, SavePicture always saves the image in a JPEG file format.

It seems that the byte[] that you get from Texture2D.GetData is not in that format, but I don't know how to convert it.