如何使用Android的VideoView从本地存储流式传输和下载媒体?

时间:2014-10-06 00:16:46

标签: android video-streaming android-videoview nanohttpd progressive-download

我必须从服务器流式传输和下载视频文件并在VideoView中显示它,感谢谷歌,VV并不能自然地支持我的要求,所以这就是我所做的:

1 - 使用NanoHTTPD创建HTTP代理并开始从服务器下载文件

2启动VideoView并将uri设置为我的HTTP代理

我的代理服务器中的3-inside server()我开始响应VideoView,与具有相应响应标头的真实服务器相同(我的意思是内容长度/内容范围,206响应)

但问题是从VideoView开始,它正确地读取300kb的视频文件,之后它从619kb或其他东西请求。我不知道为什么VV想要从300,000字节跳跃并突然跳到619,000bytes,经过10次尝试后它会在我看不到的VideoView的c ++代码中用ERROR -1004回应我任何线索是什么。

以下是我的完整解决方案。 任何帮助都是值得赞赏的,因为我对VideoView及其奇怪的行为一无所知!!!

注意:我故意修改了文件的大小,没有任何问题。

package com.example.videoBuffer2;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.MediaController;
import android.widget.VideoView;

import java.io.*;
import java.util.Map;

public class MyActivity extends Activity {
    /**
     * Called when the activity is first created.
     */
    Button btn;
    VideoView videoView;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn = (Button) findViewById(R.id.button);
        videoView = (VideoView) findViewById(R.id.videoView);
        MediaController mediaController = new
                MediaController(this);
        videoView.setMediaController(mediaController);
        final VideoStreamServer server = new VideoStreamServer(9090);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    server.start();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                videoView.setVideoURI(Uri.parse("http://127.0.0.1:9090/1.mp4"));
                videoView.requestFocus();

                videoView.start();
            }
        });
    }


    public class VideoStreamServer extends NanoHTTPD
    {

        public VideoStreamServer(int port) {
            super(port);
        }

        @Override
        public Response serve(String uri, Method method, Map<String, String> headers, Map<String, String> parms, Map<String, String> files) {

            //range=bytes=619814-
            long range;

            if (headers.containsKey("range"))
            {
                String contentRange = headers.get("range");
                range = Integer.parseInt(contentRange.substring(contentRange.indexOf("=") + 1, contentRange.indexOf("-")));
            }
            else
                range = 0;


            byte[] buffer;
            int constantLength = 256000;
            long bufLength=0;
            boolean isLastPart=false;
            try {

                RandomAccessFile ff =new RandomAccessFile(new File("/mnt/sdcard","1.mp4"),"rw" );
                long remainingChunk = ff.length() - range; //remaining
                if (remainingChunk < constantLength){
                    bufLength= remainingChunk; //means last part
                    isLastPart = true;
                }

                else
                    bufLength = constantLength;
                if (range !=0)
                    ff.seek(range);
                buffer= new byte[(int)bufLength];


                ff.read(buffer);


            } catch (FileNotFoundException e) {
                e.printStackTrace();
                buffer = new byte[0];
            } catch (IOException e) {
                e.printStackTrace();
                buffer = new byte[0];
            }
            Response response;
//            if (isLastPart)
//                response = new Response(Response.Status.OK,"video/mp4",new ByteArrayInputStream(buffer));
//            else
                response = new Response(Response.Status.PARTIAL_CONTENT,"video/mp4",new ByteArrayInputStream(buffer));

            response.addHeader("Content-Length","891064");
            response.addHeader("Content-Range",String.format("bytes %s-%s/%s", range,(range+bufLength),"891064"));
            Log.e("SERVER","Inside server sent " + String.format("bytes %s-%s/%s", range,(range+bufLength),"891064"));
            return response;

        }
    }
}

1 个答案:

答案 0 :(得分:-2)

最后我发现我的问题问题不在于代码,但根据谷歌的文档,我使用的媒体并不是标准的。

您可以在此处阅读更多内容:http://www.vahidhashemi.com/?p=120