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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 import java.util.LinkedList;
     31 
     32 /** Java wrapper for a C++ MediaStreamInterface. */
     33 public class MediaStream {
     34   public final LinkedList<AudioTrack> audioTracks;
     35   public final LinkedList<VideoTrack> videoTracks;
     36   public final LinkedList<VideoTrack> preservedVideoTracks;
     37   // Package-protected for PeerConnection.
     38   final long nativeStream;
     39 
     40   public MediaStream(long nativeStream) {
     41     audioTracks = new LinkedList<AudioTrack>();
     42     videoTracks = new LinkedList<VideoTrack>();
     43     preservedVideoTracks = new LinkedList<VideoTrack>();
     44     this.nativeStream = nativeStream;
     45   }
     46 
     47   public boolean addTrack(AudioTrack track) {
     48     if (nativeAddAudioTrack(nativeStream, track.nativeTrack)) {
     49       audioTracks.add(track);
     50       return true;
     51     }
     52     return false;
     53   }
     54 
     55   public boolean addTrack(VideoTrack track) {
     56     if (nativeAddVideoTrack(nativeStream, track.nativeTrack)) {
     57       videoTracks.add(track);
     58       return true;
     59     }
     60     return false;
     61   }
     62 
     63   // Tracks added in addTrack() call will be auto released once MediaStream.dispose()
     64   // is called. If video track need to be preserved after MediaStream is destroyed it
     65   // should be added to MediaStream using addPreservedTrack() call.
     66   public boolean addPreservedTrack(VideoTrack track) {
     67     if (nativeAddVideoTrack(nativeStream, track.nativeTrack)) {
     68       preservedVideoTracks.add(track);
     69       return true;
     70     }
     71     return false;
     72   }
     73 
     74   public boolean removeTrack(AudioTrack track) {
     75     if (nativeRemoveAudioTrack(nativeStream, track.nativeTrack)) {
     76       audioTracks.remove(track);
     77       return true;
     78     }
     79     return false;
     80   }
     81 
     82   public boolean removeTrack(VideoTrack track) {
     83     if (nativeRemoveVideoTrack(nativeStream, track.nativeTrack)) {
     84       videoTracks.remove(track);
     85       preservedVideoTracks.remove(track);
     86       return true;
     87     }
     88     return false;
     89   }
     90 
     91   public void dispose() {
     92     // Remove and release previously added audio and video tracks.
     93     while (!audioTracks.isEmpty()) {
     94       AudioTrack track = audioTracks.getFirst();
     95       removeTrack(track);
     96       track.dispose();
     97     }
     98     while (!videoTracks.isEmpty()) {
     99       VideoTrack track = videoTracks.getFirst();
    100       removeTrack(track);
    101       track.dispose();
    102     }
    103     // Remove, but do not release preserved video tracks.
    104     while (!preservedVideoTracks.isEmpty()) {
    105       removeTrack(preservedVideoTracks.getFirst());
    106     }
    107     free(nativeStream);
    108   }
    109 
    110   public String label() {
    111     return nativeLabel(nativeStream);
    112   }
    113 
    114   public String toString() {
    115     return "[" + label() + ":A=" + audioTracks.size() +
    116         ":V=" + videoTracks.size() + "]";
    117   }
    118 
    119   private static native boolean nativeAddAudioTrack(
    120       long nativeStream, long nativeAudioTrack);
    121 
    122   private static native boolean nativeAddVideoTrack(
    123       long nativeStream, long nativeVideoTrack);
    124 
    125   private static native boolean nativeRemoveAudioTrack(
    126       long nativeStream, long nativeAudioTrack);
    127 
    128   private static native boolean nativeRemoveVideoTrack(
    129       long nativeStream, long nativeVideoTrack);
    130 
    131   private static native String nativeLabel(long nativeStream);
    132 
    133   private static native void free(long nativeStream);
    134 }
    135