1 /* 2 * Copyright (C) 2016 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 ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_0_EVSCAMERA_H 18 #define ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_0_EVSCAMERA_H 19 20 #include <android/hardware/automotive/evs/1.0/types.h> 21 #include <android/hardware/automotive/evs/1.0/IEvsCamera.h> 22 #include <ui/GraphicBuffer.h> 23 24 #include <thread> 25 26 27 namespace android { 28 namespace hardware { 29 namespace automotive { 30 namespace evs { 31 namespace V1_0 { 32 namespace implementation { 33 34 35 // From EvsEnumerator.h 36 class EvsEnumerator; 37 38 39 class EvsCamera : public IEvsCamera { 40 public: 41 // Methods from ::android::hardware::automotive::evs::V1_0::IEvsCamera follow. 42 Return<void> getCameraInfo(getCameraInfo_cb _hidl_cb) override; 43 Return <EvsResult> setMaxFramesInFlight(uint32_t bufferCount) override; 44 Return <EvsResult> startVideoStream(const ::android::sp<IEvsCameraStream>& stream) override; 45 Return<void> doneWithFrame(const BufferDesc& buffer) override; 46 Return<void> stopVideoStream() override; 47 Return <int32_t> getExtendedInfo(uint32_t opaqueIdentifier) override; 48 Return <EvsResult> setExtendedInfo(uint32_t opaqueIdentifier, int32_t opaqueValue) override; 49 50 // Implementation details 51 EvsCamera(const char *id); 52 virtual ~EvsCamera() override; 53 void forceShutdown(); // This gets called if another caller "steals" ownership of the camera 54 getDesc()55 const CameraDesc& getDesc() { return mDescription; }; 56 57 static const char kCameraName_Backup[]; 58 59 private: 60 // These three functions are expected to be called while mAccessLock is held 61 bool setAvailableFrames_Locked(unsigned bufferCount); 62 unsigned increaseAvailableFrames_Locked(unsigned numToAdd); 63 unsigned decreaseAvailableFrames_Locked(unsigned numToRemove); 64 65 void generateFrames(); 66 void fillTestFrame(const BufferDesc& buff); 67 68 sp<EvsEnumerator> mEnumerator; // The enumerator object that created this camera 69 70 CameraDesc mDescription = {}; // The properties of this camera 71 72 std::thread mCaptureThread; // The thread we'll use to synthesize frames 73 74 uint32_t mWidth = 0; // Horizontal pixel count in the buffers 75 uint32_t mHeight = 0; // Vertical pixel count in the buffers 76 uint32_t mFormat = 0; // Values from android_pixel_format_t [TODO: YUV? Leave opaque?] 77 uint32_t mUsage = 0; // Values from from Gralloc.h 78 uint32_t mStride = 0; // Bytes per line in the buffers 79 80 sp <IEvsCameraStream> mStream = nullptr; // The callback used to deliver each frame 81 82 struct BufferRecord { 83 buffer_handle_t handle; 84 bool inUse; 85 BufferRecordBufferRecord86 explicit BufferRecord(buffer_handle_t h) : handle(h), inUse(false) {}; 87 }; 88 89 std::vector <BufferRecord> mBuffers; // Graphics buffers to transfer images 90 unsigned mFramesAllowed; // How many buffers are we currently using 91 unsigned mFramesInUse; // How many buffers are currently outstanding 92 93 enum StreamStateValues { 94 STOPPED, 95 RUNNING, 96 STOPPING, 97 DEAD, 98 }; 99 StreamStateValues mStreamState; 100 101 // Synchronization necessary to deconflict mCaptureThread from the main service thread 102 std::mutex mAccessLock; 103 }; 104 105 } // namespace implementation 106 } // namespace V1_0 107 } // namespace evs 108 } // namespace automotive 109 } // namespace hardware 110 } // namespace android 111 112 #endif // ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_0_EVSCAMERA_H 113