**
download:FFmpeg音视频核心技术精讲与实战
**
**
本课程将理论与实战相结合，由浅入深的讲解FFmpeg核心技术，去掉音视频处理的一层层神秘面纱，让你掌握FFmpeg音视频编解码，音视频渲染，不依赖第三方SDK的播放器开发等核心技术，助你成为一个高效、高薪的音视频工程师
**
**
适合人群
想转做音视频的工程师 / 想系统学习FFmpeg音视频处理的工程师
Android开发工程师
技术储备要求
具备一定的自学能力 / 具备一门语言基础（如C语言） / 具备Linux基础
（常用命令） / 如果有Android基础更好
**
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
/**
* @program: rocketmq-demo
* @description: 次第音訊消费
* @author: syske
* @create: 2021-03-09 20:35
*/
public class Producer {
public static void main(String[] args) throws Exception {
DefaultMQProducer producer = new DefaultMQProducer("order_group_1");
producer.setNamesrvAddr("127.0.0.1:9876");
producer.start();
String[] tags = new String[]{"TagA", "TagC", "TagD"};
// 订單列表
List orderList = new Producer().buildOrders();
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateStr = sdf.format(date);
for (int i = 0; i < 10; i++) {
// 加個時間前缀
String body = dateStr + " Hello RocketMQ " + orderList.get(i);
Message msg = new Message("TopicTest", tags[i % tags.length], "KEY" + i, body.getBytes());
SendResult sendResult = producer.send(msg, (mqs, msg1, arg) -> {
Long id = (Long) arg; //依據订單id選择發送queue
long index = id % mqs.size();
return mqs.get((int) index);
}, orderList.get(i).getOrderId());//订單id
System.out.println(String.format("SendResult status:%s, queueId:%d, body:%s",
sendResult.getSendStatus(),
sendResult.getMessageQueue().getQueueId(),
body));
}
producer.shutdown();
}
/**
* 订單的步骤
*/
private static class OrderStep {
private long orderId;
private String desc;
public long getOrderId() {
return orderId;
}
public void setOrderId(long orderId) {
this.orderId = orderId;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
@Override
public String toString() {
return "OrderStep{" +
"orderId=" + orderId +
", desc='" + desc + '\'' +
'}';
}
}
/**
* 生成模仿订單數據
*/
private List buildOrders() {
List orderList = new ArrayList();
OrderStep orderDemo = new OrderStep();
orderDemo.setOrderId(15103111039L);
orderDemo.setDesc("創立1");
orderList.add(orderDemo);
orderDemo = new OrderStep();
orderDemo.setOrderId(15103111065L);
orderDemo.setDesc("創立2");
orderList.add(orderDemo);
orderDemo = new OrderStep();
orderDemo.setOrderId(15103111039L);
orderDemo.setDesc("付款1");
orderList.add(orderDemo);
orderDemo = new OrderStep();
orderDemo.setOrderId(15103117235L);
orderDemo.setDesc("創立3");
orderList.add(orderDemo);
orderDemo = new OrderStep();
orderDemo.setOrderId(15103111065L);
orderDemo.setDesc("付款2");
orderList.add(orderDemo);
orderDemo = new OrderStep();
orderDemo.setOrderId(15103117235L);
orderDemo.setDesc("付款3");
orderList.add(orderDemo);
orderDemo = new OrderStep();
orderDemo.setOrderId(15103111065L);
orderDemo.setDesc("完成1");
orderList.add(orderDemo);
orderDemo = new OrderStep();
orderDemo.setOrderId(15103111039L);
orderDemo.setDesc("推送1");
orderList.add(orderDemo);
orderDemo = new OrderStep();
orderDemo.setOrderId(15103117235L);
orderDemo.setDesc("完成2");
orderList.add(orderDemo);
orderDemo = new OrderStep();
orderDemo.setOrderId(15103111039L);
orderDemo.setDesc("完成3");
orderList.add(orderDemo);
return orderList;
}
}
次第音訊消费者
import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeOrderlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeOrderlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerOrderly;
import org.apache.rocketmq.common.consumer.ConsumeFromWhere;
import org.apache.rocketmq.common.message.MessageExt;
import java.util.List;
import java.util.Random;
import java.util.concurrent.TimeUnit;
/**
* @program: rocketmq-demo
* @description: 次第音訊消费者
* @author: syske
* @create: 2021-03-09 20:37
*/
public class ConsumerInOrder {
public static void main(String[] args) throws Exception {
DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("order_group_3");
consumer.setNamesrvAddr("127.0.0.1:9876");
/**
* 設置Consumer第一次啟動是從隊列頭部開端消费還是隊列尾部開端消费
* 假如非第一次啟動，那麼依照上次消费的位置繼續消费
*/
consumer.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
consumer.subscribe("TopicTest", "TagA || TagC || TagD");
consumer.registerMessageListener(new MessageListenerOrderly() {
Random random = new Random();
@Override
public ConsumeOrderlyStatus consumeMessage(List msgs, ConsumeOrderlyContext context) {
context.setAutoCommit(true);
for (MessageExt msg : msgs) {
// 能夠看到每個queue有獨一的consume線程來消费, 订單對每個queue(分區)有序
System.out.println("consumeThread=" + Thread.currentThread().getName() + "queueId=" + msg.getQueueId() + ", content:" + new String(msg.getBody()));
}
try {
//模仿業務逻輯處置中...
TimeUnit.SECONDS.sleep(random.nextInt(10));
} catch (Exception e) {
e.printStackTrace();
}
return ConsumeOrderlyStatus.SUCCESS;
}
});
consumer.start();
System.out.println("Consumer Started.");
}
}
