玩转 Android MediaPlayer之Media Proxy
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本文是在《Android MediaPlayer与Http Proxy结合之提高篇》基础上，进一步优化代理服务器，支持了Http的302、301重定向，获取Http Request和Http Response的文本内容。本文以视频播放结合Http Proxy，讲述MediaPlayer播放过程中的握手过程。
吐槽一下：用google搜索“代理服务器”无效，所以本文用Media Proxy，大家懂的......
先来看看本文程序运行的截屏动画：
再来看看程序运行时输出的Log信息.....这里是关键：
07-29 15:51:30.692: E/HttpGetProxy(449): ..........sckPlayer connected.......... MediaPlayer发出请求
07-29 15:51:30.692: E/to Media Server---->(449): GET /vids/family_guy_penis_car.3gp HTTP/1.1
07-29 15:51:30.692: E/to Media Server---->(449): User-Agent: stagefright/1.0 (Linux;Android 2.2)
07-29 15:51:30.692: E/to Media Server---->(449): Host: daily3gp.com
07-29 15:51:30.692: E/to Media Server---->(449):
07-29 15:51:31.119: E/HttpGetProxy(449): ..........remote Server connected..........
07-29 15:51:31.122: E/HttpGetProxy(449): ..........remote start to receive..........
07-29 15:51:31.775: E/from Media Server---->(449): HTTP/1.1 200 OK
07-29 15:51:31.775: E/from Media Server---->(449): Date: Sun, 29 Jul 2012 15:51:33 GMT
07-29 15:51:31.775: E/from Media Server---->(449): Server: Apache
07-29 15:51:31.775: E/from Media Server---->(449): Last-Modified: Thu, 14 Jan 2010 23:29:02 GMT
07-29 15:51:31.775: E/from Media Server---->(449): Accept-Ranges: bytes
07-29 15:51:31.775: E/from Media Server---->(449): Content-Length: 754777
07-29 15:51:31.775: E/from Media Server---->(449): Content-Type: video/3gpp
07-29 15:51:34.512: E/HttpGetProxy(449): ..........sckPlayer connected..........MediaPlayer发出请求
07-29 15:51:34.532: E/to Media Server---->(449): GET /vids/family_guy_penis_car.3gp HTTP/1.1
07-29 15:51:34.532: E/to Media Server---->(449): User-Agent: stagefright/1.0 (Linux;Android 2.2)
07-29 15:51:34.532: E/to Media Server---->(449): Host: daily3gp.com
07-29 15:51:34.532: E/to Media Server---->(449): Range: bytes=720896-
07-29 15:51:34.532: E/to Media Server---->(449):
07-29 15:51:34.873: E/HttpGetProxy(449): ..........remote Server connected..........
07-29 15:51:34.873: E/HttpGetProxy(449): ..........remote start to receive..........
07-29 15:51:35.505: E/from Media Server---->(449): HTTP/1.1 206 Partial Content
07-29 15:51:35.505: E/from Media Server---->(449): Date: Sun, 29 Jul 2012 15:51:36 GMT
07-29 15:51:35.505: E/from Media Server---->(449): Server: Apache
07-29 15:51:35.505: E/from Media Server---->(449): Last-Modified: Thu, 14 Jan 2010 23:29:02 GMT
07-29 15:51:35.505: E/from Media Server---->(449): Accept-Ranges: bytes
07-29 15:51:35.505: E/from Media Server---->(449): Content-Length: 33881
07-29 15:51:35.505: E/from Media Server---->(449): Content-Range: bytes 720896-754776/754777
07-29 15:51:35.505: E/from Media Server---->(449): Content-Type: video/3gpp
07-29 15:51:38.754: E/HttpGetProxy(449): ..........over..........
07-29 15:51:51.461: E/HttpGetProxy(449): ..........sckPlayer connected..........MediaPlayer发出请求
07-29 15:51:51.471: E/to Media Server---->(449): GET /vids/family_guy_penis_car.3gp HTTP/1.1
07-29 15:51:51.471: E/to Media Server---->(449): User-Agent: stagefright/1.0 (Linux;Android 2.2)
07-29 15:51:51.471: E/to Media Server---->(449): Host: daily3gp.com
07-29 15:51:51.471: E/to Media Server---->(449): Range: bytes=196608-
07-29 15:51:51.471: E/to Media Server---->(449):
07-29 15:51:51.722: E/HttpGetProxy(449): ..........remote Server connected..........
07-29 15:51:51.722: E/HttpGetProxy(449): ..........remote start to receive..........
07-29 15:51:52.285: E/from Media Server---->(449): HTTP/1.1 206 Partial Content
07-29 15:51:52.285: E/from Media Server---->(449): Date: Sun, 29 Jul 2012 15:51:53 GMT
07-29 15:51:52.285: E/from Media Server---->(449): Server: Apache
07-29 15:51:52.285: E/from Media Server---->(449): Last-Modified: Thu, 14 Jan 2010 23:29:02 GMT
07-29 15:51:52.285: E/from Media Server---->(449): Accept-Ranges: bytes
07-29 15:51:52.285: E/from Media Server---->(449): Content-Length: 558169
07-29 15:51:52.285: E/from Media Server---->(449): Content-Range: bytes 196608-754776/754777
07-29 15:51:52.285: E/from Media Server---->(449): Content-Type: video/3gpp
07-29 15:51:54.812: E/HttpGetProxy(449): ..........sckPlayer connected..........MediaPlayer发出请求
07-29 15:51:54.822: E/to Media Server---->(449): GET /vids/family_guy_penis_car.3gp HTTP/1.1
07-29 15:51:54.822: E/to Media Server---->(449): User-Agent: stagefright/1.0 (Linux;Android 2.2)
07-29 15:51:54.822: E/to Media Server---->(449): Host: daily3gp.com
07-29 15:51:54.822: E/to Media Server---->(449): Range: bytes=589824-
07-29 15:51:54.822: E/to Media Server---->(449):
07-29 15:51:55.117: E/HttpGetProxy(449): ..........remote Server connected..........
07-29 15:51:55.117: E/HttpGetProxy(449): ..........remote start to receive..........
07-29 15:51:55.693: E/from Media Server---->(449): HTTP/1.1 206 Partial Content
07-29 15:51:55.693: E/from Media Server---->(449): Date: Sun, 29 Jul 2012 15:51:57 GMT
07-29 15:51:55.693: E/from Media Server---->(449): Server: Apache
07-29 15:51:55.693: E/from Media Server---->(449): Last-Modified: Thu, 14 Jan 2010 23:29:02 GMT
07-29 15:51:55.693: E/from Media Server---->(449): Accept-Ranges: bytes
07-29 15:51:55.693: E/from Media Server---->(449): Content-Length: 164953
07-29 15:51:55.693: E/from Media Server---->(449): Content-Range: bytes 589824-754776/754777
07-29 15:51:55.693: E/from Media Server---->(449): Content-Type: video/3gpp
07-29 15:51:59.620: E/HttpGetProxy(449): ..........over..........
从截屏动画和Log信息看出，手动seek一次，但MediaPlayer进行了多次Range请求，这说明了“MediaPlayer会自动seek”，或许与MediaPlayer本地缓存有关。另外，不同硬解厂家实现的MediaPlayer估计会有不同的操作。
本文的代码可以到这里下载:
http://download.csdn.net/detail/hcb1230/6593509
HttpGetProxy.JAVA还是本文的关键部分：
public class HttpGetProxy { final static private String TAG = "HttpGetProxy"; final static private String LOCAL_IP_ADDRESS_1 = "127.0.0.1"; final static private String LOCAL_IP_ADDRESS_2 = "10.0.2.2"; final static private int HTTP_PORT = 80; final static private String HTTP_END="\r\n\r\n"; /**代理服务器使用的端口*/ private int proxy_ip_port; /**链接带的端口*/ private String original_ip_port; /**远程服务器地址*/ private String remoteHost; /**本地服务器地址*/ private String localHost; private ServerSocket localServer = null; /**收发Media Player请求的Socket*/ private Socket sckPlayer = null; /**收发Media Server请求的Socket*/ private Socket sckServer = null; private SocketAddress address; /** * 初始化代理服务器 * @param localport 代理服务器监听的端口 */ public HttpGetProxy(int localport) { try {_HttpGetProxy(LOCAL_IP_ADDRESS_1,localport);} catch (Exception e) {Log.e(TAG,LOCAL_IP_ADDRESS_1+"???"+e.toString());try {_HttpGetProxy(LOCAL_IP_ADDRESS_2,localport);}catch (Exception e1) {Log.e(TAG,LOCAL_IP_ADDRESS_2+"???"+e.toString());System.exit(0);}} } private void _HttpGetProxy(String ipAddress,int localport) throws UnknownHostException, IOException { proxy_ip_port=localport; localServer = new ServerSocket(localport,1,InetAddress.getByName(ipAddress)); localHost=ipAddress; } /** * 把网络URL转为本地URL，127.0.0.1替换网络域名 * @param url 网络URL * @return 本地URL */ public String getLocalURL(String urlString){ //----排除HTTP特殊----// String targetUrl=ProxyUtils.getRedirectUrl(urlString); //----获取对应本地代理服务器的链接----// String result = null; URI originalURI=URI.create(targetUrl); remoteHost=originalURI.getHost(); if(originalURI.getPort()!=-1){//URL带Port address = new InetSocketAddress(remoteHost,originalURI.getPort());//使用默认端口 original_ip_port = originalURI.getPort()+"";//保存端口，中转时替换 result=targetUrl.replace(remoteHost+":"+originalURI.getPort(), localHost+":"+proxy_ip_port); } else{//URL不带Port address = new InetSocketAddress(remoteHost,HTTP_PORT);//使用80端口 original_ip_port = ""; result=targetUrl.replace(remoteHost,localHost+":"+proxy_ip_port); } return result; } /** * 启动代理服务器 * @throws IOException */ public void asynStartProxy(){ new Thread() { public void run() { int bytes_read; byte[] local_request = new byte[1024]; byte[] remote_reply = new byte[1024]; while (true) { try { //-------------------------------------- //监听MediaPlayer的请求，MediaPlayer->代理服务器 //-------------------------------------- sckPlayer = localServer.accept(); Log.e(TAG, "..........sckPlayer connected.........."); String requestStr = ""; while ((bytes_read = sckPlayer.getInputStream().read(local_request)) != -1) { byte[] tmpBuffer=new byte[bytes_read]; System.arraycopy(local_request,0,tmpBuffer,0,bytes_read); String str = new String(tmpBuffer); //Log.e("from MediaPlayer---->", str); requestStr = requestStr + str; if (requestStr.contains("GET") && requestStr.contains(HTTP_END)) { break; } } //把request中的本地ip改为远程ip requestStr = requestStr.replace(localHost,remoteHost); //把代理服务器端口改为原URL端口 if(TextUtils.isEmpty(original_ip_port)) requestStr = requestStr.replace(":"+proxy_ip_port, ""); else requestStr = requestStr.replace(":"+proxy_ip_port, ":"+original_ip_port); Log.e("to Media Server---->", requestStr); //-------------------------------------- //把MediaPlayer的请求发到网络服务器，代理服务器->网络服务器 //-------------------------------------- sckServer = new Socket(); sckServer.connect(address); Log.e(TAG,"..........remote Server connected.........."); sckServer.getOutputStream().write(requestStr.getBytes());//发送MediaPlayer的请求 //------------------------------------------------------ //把网络服务器的反馈发到MediaPlayer，网络服务器->代理服务器->MediaPlayer //------------------------------------------------------ Log.e(TAG,"..........remote start to receive.........."); String responseStr = ""; boolean isCaptured=false; while ((bytes_read = sckServer.getInputStream().read(remote_reply)) != -1) { byte[] tmpBuffer=new byte[bytes_read]; System.arraycopy(remote_reply,0,tmpBuffer,0,bytes_read); //----捕获收到的Response文本内容----//if (!isCaptured) {String str = new String(tmpBuffer);responseStr += str;if (responseStr.contains("HTTP/") && responseStr.contains(HTTP_END)) {int endIndex=responseStr.indexOf(HTTP_END, 0);responseStr=responseStr.substring(0, endIndex);Log.e("from Media Server---->", responseStr);isCaptured=true; }} sckPlayer.getOutputStream().write(tmpBuffer); sckPlayer.getOutputStream().flush(); } Log.e(TAG, "..........over.........."); //关闭对内，对内 2个SOCKET sckPlayer.close(); sckServer.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }.start(); } } - 玩转 Android MediaPlayer之Media Proxy
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