海康工业相机对接优化视频流
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@@ -6,6 +6,9 @@ import org.springframework.stereotype.Service;
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import org.springframework.web.socket.BinaryMessage;
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import org.springframework.web.socket.WebSocketSession;
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import javax.imageio.ImageIO;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayOutputStream;
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import java.util.ArrayList;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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@@ -24,6 +27,10 @@ public class CameraService {
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private final Map<String, WebSocketSession> webSocketSessions = new ConcurrentHashMap<>();
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// 相机是否正在运行
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private boolean isRunning = false;
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// 帧率控制相关
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private long lastFrameTime = 0;
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private final int targetFps = 15; // 目标帧率
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private final long frameInterval = 1000 / targetFps; // 帧间隔(毫秒)
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/**
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* 初始化相机
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@@ -228,13 +235,33 @@ public class CameraService {
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}
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try {
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// 帧率控制
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long currentTime = System.currentTimeMillis();
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if (currentTime - lastFrameTime < frameInterval) {
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return; // 跳过当前帧,控制帧率
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}
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lastFrameTime = currentTime;
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// 打印帧信息,以便调试
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printFrameInfo(frameInfo);
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// 对于黑白相机(MV-CE050-30GM),数据是单通道灰度格式
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// 创建包含图像尺寸信息和原始数据的消息
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// 将原始灰度数据转换为BufferedImage
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BufferedImage image = new BufferedImage(frameInfo.width, frameInfo.height, BufferedImage.TYPE_BYTE_GRAY);
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image.getRaster().setDataElements(0, 0, frameInfo.width, frameInfo.height, bytes);
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// 压缩图像为JPEG格式
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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ImageIO.write(image, "jpeg", baos);
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byte[] compressedData = baos.toByteArray();
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baos.close();
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log.debug("Original size: {} bytes, Compressed size: {} bytes, Compression ratio: {:.2f}%",
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bytes.length, compressedData.length, (1 - (double)compressedData.length / bytes.length) * 100);
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// 创建包含图像尺寸信息和压缩数据的消息
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// 消息格式: [width(4 bytes)][height(4 bytes)][image data]
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byte[] message = new byte[8 + bytes.length];
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byte[] message = new byte[8 + compressedData.length];
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// 写入宽度和高度(使用小端序)
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message[0] = (byte) (frameInfo.width & 0xFF);
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@@ -247,8 +274,8 @@ public class CameraService {
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message[6] = (byte) ((frameInfo.height >> 16) & 0xFF);
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message[7] = (byte) ((frameInfo.height >> 24) & 0xFF);
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// 写入原始图像数据
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System.arraycopy(bytes, 0, message, 8, bytes.length);
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// 写入压缩后的图像数据
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System.arraycopy(compressedData, 0, message, 8, compressedData.length);
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// 发送图像数据到所有连接的WebSocket客户端
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for (WebSocketSession session : webSocketSessions.values()) {
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