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      1 /*
      2  * libjingle
      3  * Copyright 2015 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 wrapper for a C++ RtpSenderInterface. */
     31 public class RtpSender {
     32   final long nativeRtpSender;
     33 
     34   private MediaStreamTrack cachedTrack;
     35   private boolean ownsTrack = true;
     36 
     37   public RtpSender(long nativeRtpSender) {
     38     this.nativeRtpSender = nativeRtpSender;
     39     long track = nativeGetTrack(nativeRtpSender);
     40     // It may be possible for an RtpSender to be created without a track.
     41     cachedTrack = (track == 0) ? null : new MediaStreamTrack(track);
     42   }
     43 
     44   // If |takeOwnership| is true, the RtpSender takes ownership of the track
     45   // from the caller, and will auto-dispose of it when no longer needed.
     46   // |takeOwnership| should only be used if the caller owns the track; it is
     47   // not appropriate when the track is owned by, for example, another RtpSender
     48   // or a MediaStream.
     49   public boolean setTrack(MediaStreamTrack track, boolean takeOwnership) {
     50     if (!nativeSetTrack(nativeRtpSender,
     51                         (track == null) ? 0 : track.nativeTrack)) {
     52         return false;
     53     }
     54     if (cachedTrack != null && ownsTrack) {
     55       cachedTrack.dispose();
     56     }
     57     cachedTrack = track;
     58     ownsTrack = takeOwnership;
     59     return true;
     60   }
     61 
     62   public MediaStreamTrack track() {
     63     return cachedTrack;
     64   }
     65 
     66   public String id() {
     67     return nativeId(nativeRtpSender);
     68   }
     69 
     70   public void dispose() {
     71     if (cachedTrack != null && ownsTrack) {
     72       cachedTrack.dispose();
     73     }
     74     free(nativeRtpSender);
     75   }
     76 
     77   private static native boolean nativeSetTrack(long nativeRtpSender,
     78                                                long nativeTrack);
     79 
     80   // This should increment the reference count of the track.
     81   // Will be released in dispose() or setTrack().
     82   private static native long nativeGetTrack(long nativeRtpSender);
     83 
     84   private static native String nativeId(long nativeRtpSender);
     85 
     86   private static native void free(long nativeRtpSender);
     87 }
     88 ;
     89