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
29package org.webrtc;
30
31/**
32 * Java version of VideoSourceInterface, extended with stop/restart
33 * functionality to allow explicit control of the camera device on android,
34 * where there is no support for multiple open capture devices and the cost of
35 * holding a camera open (even if MediaStreamTrack.setEnabled(false) is muting
36 * its output to the encoder) can be too high to bear.
37 */
38public class VideoSource extends MediaSource {
39  private long nativeVideoFormatAtStop;
40
41  public VideoSource(long nativeSource) {
42    super(nativeSource);
43  }
44
45  // Stop capture feeding this source.
46  public void stop() {
47    nativeVideoFormatAtStop = stop(nativeSource);
48  }
49
50  // Restart capture feeding this source.  stop() must have been called since
51  // the last call to restart() (if any).  Note that this isn't "start()";
52  // sources are started by default at birth.
53  public void restart() {
54    restart(nativeSource, nativeVideoFormatAtStop);
55    nativeVideoFormatAtStop = 0;
56  }
57
58  @Override
59  public void dispose() {
60    if (nativeVideoFormatAtStop != 0) {
61      freeNativeVideoFormat(nativeVideoFormatAtStop);
62      nativeVideoFormatAtStop = 0;
63    }
64    super.dispose();
65  }
66
67  // This stop() returns an owned C++ VideoFormat pointer for use in restart()
68  // and dispose().
69  private static native long stop(long nativeSource);
70  private static native void restart(
71      long nativeSource, long nativeVideoFormatAtStop);
72  private static native void freeNativeVideoFormat(long nativeVideoFormat);
73}
74