读取动画GIF中帧之间的延迟

你如何阅读每帧之间动画GIF的控制块？ 我对每帧之间的延迟感兴趣。 我看过ImageReader的Javadoc，我什么都没看到。

这是我从动画GIF中读取所有帧的代码，如何增强它以读取动画GIF中嵌入的每个帧的元数据？

List list = new ArrayList(); try { ImageReader reader = ImageIO.getImageReadersBySuffix("gif").next(); reader.setInput(ImageIO.createImageInputStream(urlImage.openStream())); int i = reader.getMinIndex(); int numImages = reader.getNumImages(true); while (i < numImages) { list.add(reader.read(i++)); } // do stuff with frames of image... } catch (Exception e) { e.printStackTrace(); } 

Answer 1

您必须从元数据节点中寻找"delayTime"属性。 使用以下工作示例来了解：

 public class GiffTest { /** * @param args the command line arguments */ public static void main(String[] args) throws IOException { ImageReader reader = ImageIO.getImageReadersBySuffix("gif").next(); reader.setInput(ImageIO.createImageInputStream(new FileInputStream("H:\\toonGif.gif"))); int i = reader.getMinIndex(); int numImages = reader.getNumImages(true); IIOMetadata imageMetaData = reader.getImageMetadata(0); String metaFormatName = imageMetaData.getNativeMetadataFormatName(); IIOMetadataNode root = (IIOMetadataNode)imageMetaData.getAsTree(metaFormatName); IIOMetadataNode graphicsControlExtensionNode = getNode(root, "GraphicControlExtension"); System.out.println(graphicsControlExtensionNode.getAttribute("delayTime")); } private static IIOMetadataNode getNode(IIOMetadataNode rootNode, String nodeName) { int nNodes = rootNode.getLength(); for (int i = 0; i < nNodes; i++) { if (rootNode.item(i).getNodeName().compareToIgnoreCase(nodeName)== 0) { return((IIOMetadataNode) rootNode.item(i)); } } IIOMetadataNode node = new IIOMetadataNode(nodeName); rootNode.appendChild(node); return(node); } }