1 /* 2 * Copyright 2015 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef WEBRTC_SDK_ANDROID_SRC_JNI_SURFACETEXTUREHELPER_JNI_H_ 12 #define WEBRTC_SDK_ANDROID_SRC_JNI_SURFACETEXTUREHELPER_JNI_H_ 13 14 #include <jni.h> 15 16 #include "webrtc/sdk/android/src/jni/jni_helpers.h" 17 #include "webrtc/sdk/android/src/jni/native_handle_impl.h" 18 #include "webrtc/api/video/video_frame_buffer.h" 19 #include "webrtc/base/refcount.h" 20 #include "webrtc/base/scoped_ref_ptr.h" 21 22 namespace webrtc_jni { 23 24 // Helper class to create and synchronize access to an Android SurfaceTexture. 25 // It is used for creating webrtc::VideoFrameBuffers from a SurfaceTexture when 26 // the SurfaceTexture has been updated. 27 // When the VideoFrameBuffer is released, this class returns the buffer to the 28 // java SurfaceTextureHelper so it can be updated safely. The VideoFrameBuffer 29 // can be released on an arbitrary thread. 30 // SurfaceTextureHelper is reference counted to make sure that it is not 31 // destroyed while a VideoFrameBuffer is in use. 32 // This class is the C++ counterpart of the java class SurfaceTextureHelper. 33 // It owns the corresponding java object, and calls the java dispose 34 // method when destroyed. 35 // Usage: 36 // 1. Create an instance of this class. 37 // 2. Get the Java SurfaceTextureHelper with GetJavaSurfaceTextureHelper(). 38 // 3. Register a listener to the Java SurfaceListener and start producing 39 // new buffers. 40 // 4. Call CreateTextureFrame to wrap the Java texture in a VideoFrameBuffer. 41 class SurfaceTextureHelper : public rtc::RefCountInterface { 42 public: 43 // Might return null if creating the Java SurfaceTextureHelper fails. 44 static rtc::scoped_refptr<SurfaceTextureHelper> create( 45 JNIEnv* jni, const char* thread_name, jobject j_egl_context); 46 47 jobject GetJavaSurfaceTextureHelper() const; 48 49 rtc::scoped_refptr<webrtc::VideoFrameBuffer> CreateTextureFrame( 50 int width, 51 int height, 52 const NativeHandleImpl& native_handle); 53 54 // May be called on arbitrary thread. 55 void ReturnTextureFrame() const; 56 57 protected: 58 ~SurfaceTextureHelper(); 59 SurfaceTextureHelper(JNIEnv* jni, jobject j_surface_texture_helper); 60 61 private: 62 const ScopedGlobalRef<jobject> j_surface_texture_helper_; 63 const jmethodID j_return_texture_method_; 64 }; 65 66 } // namespace webrtc_jni 67 68 #endif // WEBRTC_SDK_ANDROID_SRC_JNI_SURFACETEXTUREHELPER_JNI_H_ 69