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 29 #ifndef TALK_APP_WEBRTC_JAVA_JNI_SURFACETEXTUREHELPER_JNI_H_ 30 #define TALK_APP_WEBRTC_JAVA_JNI_SURFACETEXTUREHELPER_JNI_H_ 31 32 #include <jni.h> 33 34 #include "talk/app/webrtc/java/jni/jni_helpers.h" 35 #include "talk/app/webrtc/java/jni/native_handle_impl.h" 36 #include "webrtc/base/refcount.h" 37 #include "webrtc/base/scoped_ref_ptr.h" 38 #include "webrtc/common_video/include/video_frame_buffer.h" 39 40 namespace webrtc_jni { 41 42 // Helper class to create and synchronize access to an Android SurfaceTexture. 43 // It is used for creating webrtc::VideoFrameBuffers from a SurfaceTexture when 44 // the SurfaceTexture has been updated. 45 // When the VideoFrameBuffer is released, this class returns the buffer to the 46 // java SurfaceTextureHelper so it can be updated safely. The VideoFrameBuffer 47 // can be released on an arbitrary thread. 48 // SurfaceTextureHelper is reference counted to make sure that it is not 49 // destroyed while a VideoFrameBuffer is in use. 50 // This class is the C++ counterpart of the java class SurfaceTextureHelper. 51 // Usage: 52 // 1. Create an java instance of SurfaceTextureHelper. 53 // 2. Create an instance of this class. 54 // 3. Register a listener to the Java SurfaceListener and start producing 55 // new buffers. 56 // 4. Call CreateTextureFrame to wrap the Java texture in a VideoFrameBuffer. 57 class SurfaceTextureHelper : public rtc::RefCountInterface { 58 public: 59 SurfaceTextureHelper(JNIEnv* jni, jobject surface_texture_helper); 60 61 rtc::scoped_refptr<webrtc::VideoFrameBuffer> CreateTextureFrame( 62 int width, 63 int height, 64 const NativeHandleImpl& native_handle); 65 66 protected: 67 ~SurfaceTextureHelper(); 68 69 private: 70 // May be called on arbitrary thread. 71 void ReturnTextureFrame() const; 72 73 const ScopedGlobalRef<jobject> j_surface_texture_helper_; 74 const jmethodID j_return_texture_method_; 75 }; 76 77 } // namespace webrtc_jni 78 79 #endif // TALK_APP_WEBRTC_JAVA_JNI_SURFACETEXTUREHELPER_JNI_H_ 80