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