Common/src/com/googlecode/android_scripting/webcam/MjpegServer.java

/*
 * Copyright (C) 2016 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.googlecode.android_scripting.webcam;

import java.io.BufferedReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import com.googlecode.android_scripting.Log;
import com.googlecode.android_scripting.SimpleServer;

class MjpegServer extends SimpleServer {

  private final JpegProvider mProvider;

  public MjpegServer(JpegProvider provider) {
    mProvider = provider;
  }

  @Override
  protected void handleConnection(Socket socket) throws Exception {
    Log.d("handle Mjpeg connection");
    byte[] data = mProvider.getJpeg();
    if (data == null) {
      return;
    }
    OutputStream outputStream = socket.getOutputStream();
    outputStream.write((
        "HTTP/1.0 200 OK\r\n" +
        "Server: SL4A\r\n" +
        "Connection: close\r\n" +
        "Max-Age: 0\r\n" +
        "Expires: 0\r\n" +
        "Cache-Control: no-cache, private\r\n" +
        "Pragma: no-cache\r\n" +
        "Content-Type: multipart/x-mixed-replace; boundary=--BoundaryString\r\n\r\n").getBytes());
    while (true) {
      data = mProvider.getJpeg();
      if (data == null) {
        return;
      }
      outputStream.write("--BoundaryString\r\n".getBytes());
      outputStream.write("Content-type: image/jpg\r\n".getBytes());
      outputStream.write(("Content-Length: " + data.length + "\r\n\r\n").getBytes());
      outputStream.write(data);
      outputStream.write("\r\n\r\n".getBytes());
      outputStream.flush();
    }
  }

  @Override
  protected void handleRPCConnection(Socket sock, Integer UID, BufferedReader reader, PrintWriter writer)
      throws Exception {
  }
}