Getting the frame duration of an animated GIF?

In C#, I can get t开发者_如何学JAVAhe individual frames from a gif and show the animation easily enough, but how do you go about getting the timing information for each frame?

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PropertyItem item = img.GetPropertyItem (0x5100); // FrameDelay in libgdiplus
// Time is in milliseconds
delay = (item.Value [0] + item.Value [1] * 256) * 10;

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