1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef EVS_VTS_STREAMHANDLER_H 18 #define EVS_VTS_STREAMHANDLER_H 19 20 #include <aidl/android/hardware/automotive/evs/BnEvsCameraStream.h> 21 #include <aidl/android/hardware/automotive/evs/BufferDesc.h> 22 #include <aidl/android/hardware/automotive/evs/DisplayState.h> 23 #include <aidl/android/hardware/automotive/evs/EvsEventDesc.h> 24 #include <aidl/android/hardware/automotive/evs/IEvsCamera.h> 25 #include <aidl/android/hardware/graphics/common/HardwareBuffer.h> 26 #include <ui/GraphicBuffer.h> 27 28 #include <queue> 29 30 /* 31 * StreamHandler: 32 * This class can be used to receive camera imagery from an IEvsCamera implementation. It will 33 * hold onto the most recent image buffer, returning older ones. 34 * Note that the video frames are delivered on a background thread, while the control interface 35 * is actuated from the applications foreground thread. 36 */ 37 class StreamHandler final : public aidl::android::hardware::automotive::evs::BnEvsCameraStream { 38 public: ~StreamHandler()39 virtual ~StreamHandler() { shutdown(); }; 40 41 StreamHandler( 42 const std::shared_ptr<aidl::android::hardware::automotive::evs::IEvsCamera>& cameraObj, 43 uint32_t numBuffers = 2, bool useOwnBuffers = false, 44 android_pixel_format_t format = HAL_PIXEL_FORMAT_RGBA_8888, int32_t width = 640, 45 int32_t height = 360); 46 void shutdown(); 47 48 bool startStream(); 49 void asyncStopStream(); 50 void blockingStopStream(); 51 52 bool isRunning(); 53 54 bool newFrameAvailable(); 55 const aidl::android::hardware::automotive::evs::BufferDesc& getNewFrame(); 56 void doneWithFrame(const aidl::android::hardware::automotive::evs::BufferDesc& buffer); 57 58 private: 59 // Implementation for aidl::android::hardware::automotive::evs::IEvsCameraStream 60 ndk::ScopedAStatus deliverFrame( 61 const std::vector<aidl::android::hardware::automotive::evs::BufferDesc>& buffers) 62 override; 63 ndk::ScopedAStatus notify( 64 const aidl::android::hardware::automotive::evs::EvsEventDesc& event) override; 65 66 // Values initialized as startup 67 std::shared_ptr<aidl::android::hardware::automotive::evs::IEvsCamera> mCamera; 68 69 // Since we get frames delivered to us asnchronously via the IEvsCameraStream interface, 70 // we need to protect all member variables that may be modified while we're streaming 71 // (i.e.: those below) 72 std::mutex mLock; 73 std::condition_variable mSignal; 74 75 bool mRunning = false; 76 77 aidl::android::hardware::automotive::evs::BufferDesc mBuffers[2]; 78 int mHeldBuffer = -1; // Index of the one currently held by the client 79 int mReadyBuffer = -1; // Index of the newest available buffer 80 std::vector<aidl::android::hardware::automotive::evs::BufferDesc> mOwnBuffers; 81 bool mUseOwnBuffers; 82 }; 83 84 #endif // EVS_VTS_STREAMHANDLER_H 85