我試圖將我的手機用作實時MJPEG視頻源。到目前爲止,捕獲幀並將其轉換爲JPEG並不是什麼大不了的事情。我真正的問題是正確地發送multipart響應。關於發送多部分響應的文檔有很多,但問題在於他們都希望所有圖像在HTTP請求進入時都可用(例如用於多圖像上傳)。爲了實時流式傳輸,當然,我需要能夠開始發送多部分響應,同時不斷在主體中添加jpeg。我絕不是一個HTTP緩衝區,所以我不需要推出自己的HTTP響應並直接寫入套接字。有支持這種行爲的圖書館嗎?我在互聯網上尋找解決方案,但我真的沒有看到任何有用的東西。作爲實時MJPEG視頻服務器的Android手機
任何想法?最糟糕的情況是,我願意看看如何手動編寫多部分響應的人類可讀文檔,但如果可能的話,我真的只想使用一個庫。
在此先感謝。
編輯:根據sigmavirus的建議使用orielly servlet庫得到它的工作。請注意,MJPEG流或多或少是通過我發送只包含圖像/ jpeg的multipart/x-mixed-replace的事實來隱含推斷的。查看我的代碼中的評論以獲得一個教程,該教程顯示了您需要運行哪些碼頭庫。當然,你還需要cos.jar,Orielly servlet庫。代碼如下:
package edu.stevens.arpac.webclient;
import java.io.IOException;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Collections;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.apache.http.conn.util.InetAddressUtils;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.AbstractHandler;
import org.eclipse.jetty.server.Request;
import com.oreilly.servlet.MultipartResponse;
import com.oreilly.servlet.ServletUtils;
import android.os.Environment;
import android.util.Log;
// holla at http://puregeekjoy.blogspot.com/2011/06/running-embedded-jetty-in-android-app.html
public class JettyServer extends Thread
{
private static final String TAG = "JettyServer";
private Server webServer;
private Boolean isStarted = false;
public JettyServer()
{
super();
Log.i(TAG, "Initializing server to port 8080");
webServer = new Server(8080);
Handler handler = new AbstractHandler() {
public void handle(String target, Request request, HttpServletRequest servletRequest,
HttpServletResponse servletResponse) throws IOException, ServletException {
ServletOutputStream out = servletResponse.getOutputStream();
MultipartResponse multi = new MultipartResponse(servletResponse);
Boolean go = true;
while(go)
{
try
{
multi.startResponse("image/jpeg");
ServletUtils.returnFile(Environment.getExternalStorageDirectory().getPath() + "/ARPac/twi.jpg", out);
multi.endResponse();
}
catch(IOException ex)
{
go = false;
Log.i(TAG, "IO Failed with exception " + ex.getMessage());
}
}
request.setHandled(true);
}
};
webServer.setHandler(handler);
try {
webServer.start();
Log.d(TAG, "started Web server @ " + getIPAddress());
isStarted = true;
}
catch (Exception e) {
Log.d(TAG, "unexpected exception starting Web server: " + e);
}
}
/**
* Get IP address from first non-localhost interface
* @return address or empty string
*/
private String getIPAddress()
{
try
{
List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
for (NetworkInterface intf : interfaces)
{
List<InetAddress> addrs = Collections.list(intf.getInetAddresses());
for (InetAddress addr : addrs)
{
if (!addr.isLoopbackAddress())
{
String sAddr = addr.getHostAddress().toUpperCase();
if (InetAddressUtils.isIPv4Address(sAddr))
{
//Log.d(TAG, "IP address is: " + sAddr);
return sAddr;
}
}
}
}
}
catch (Exception ex)
{
Log.e(TAG, "could not get IP address: " + ex.getMessage());
} // for now eat exceptions
Log.e(TAG, "Could not find a non-loopback IPv4 address!");
return "";
}
public void teardown()
{
if(isStarted)
{
try {
webServer.stop();
isStarted = false;
} catch (Exception e) {
Log.e(TAG, "Couldn't stop server. Probably was called when server already stopped.");
}
}
}
public void run()
{
}
}
不好意思,我的JettyServer類擴展了Thread但是什麼也沒做。你不需要那樣做。這只是我的代碼的方向。 – mercurytw