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      1 /*
      2  * libjingle
      3  * Copyright 2013 Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 package org.webrtc;
     29 
     30 /** Java version of cricket::VideoCapturer. */
     31 public class VideoCapturer {
     32   private long nativeVideoCapturer;
     33 
     34   protected VideoCapturer() {
     35   }
     36 
     37   public static VideoCapturer create(String deviceName) {
     38     Object capturer = nativeCreateVideoCapturer(deviceName);
     39     if (capturer != null)
     40       return (VideoCapturer) (capturer);
     41     return null;
     42   }
     43 
     44   // Sets |nativeCapturer| to be owned by VideoCapturer.
     45   protected void setNativeCapturer(long nativeCapturer) {
     46     this.nativeVideoCapturer = nativeCapturer;
     47   }
     48 
     49   // Package-visible for PeerConnectionFactory.
     50   long takeNativeVideoCapturer() {
     51     if (nativeVideoCapturer == 0) {
     52       throw new RuntimeException("Capturer can only be taken once!");
     53     }
     54     long ret = nativeVideoCapturer;
     55     nativeVideoCapturer = 0;
     56     return ret;
     57   }
     58 
     59   public void dispose() {
     60     // No-op iff this capturer is owned by a source (see comment on
     61     // PeerConnectionFactoryInterface::CreateVideoSource()).
     62     if (nativeVideoCapturer != 0) {
     63       free(nativeVideoCapturer);
     64     }
     65   }
     66 
     67   private static native Object nativeCreateVideoCapturer(String deviceName);
     68 
     69   private static native void free(long nativeVideoCapturer);
     70 }
     71