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_EVSV4LCAMERA_H 18 #define ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_0_EVSV4LCAMERA_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 #include <functional> 26 27 #include "VideoCapture.h" 28 29 30 namespace android { 31 namespace hardware { 32 namespace automotive { 33 namespace evs { 34 namespace V1_0 { 35 namespace implementation { 36 37 38 // From EvsEnumerator.h 39 class EvsEnumerator; 40 41 42 class EvsV4lCamera : public IEvsCamera { 43 public: 44 // Methods from ::android::hardware::automotive::evs::V1_0::IEvsCamera follow. 45 Return<void> getCameraInfo(getCameraInfo_cb _hidl_cb) override; 46 Return <EvsResult> setMaxFramesInFlight(uint32_t bufferCount) override; 47 Return <EvsResult> startVideoStream(const ::android::sp<IEvsCameraStream>& stream) override; 48 Return<void> doneWithFrame(const BufferDesc& buffer) override; 49 Return<void> stopVideoStream() override; 50 Return <int32_t> getExtendedInfo(uint32_t opaqueIdentifier) override; 51 Return <EvsResult> setExtendedInfo(uint32_t opaqueIdentifier, int32_t opaqueValue) override; 52 53 // Implementation details 54 EvsV4lCamera(const char *deviceName); 55 virtual ~EvsV4lCamera() override; 56 void shutdown(); 57 getDesc()58 const CameraDesc& getDesc() { return mDescription; }; 59 60 private: 61 // These three functions are expected to be called while mAccessLock is held 62 bool setAvailableFrames_Locked(unsigned bufferCount); 63 unsigned increaseAvailableFrames_Locked(unsigned numToAdd); 64 unsigned decreaseAvailableFrames_Locked(unsigned numToRemove); 65 66 void forwardFrame(imageBuffer* tgt, void* data); 67 68 sp <IEvsCameraStream> mStream = nullptr; // The callback used to deliver each frame 69 70 VideoCapture mVideo; // Interface to the v4l device 71 72 CameraDesc mDescription = {}; // The properties of this camera 73 uint32_t mFormat = 0; // Values from android_pixel_format_t 74 uint32_t mUsage = 0; // Values from from Gralloc.h 75 uint32_t mStride = 0; // Pixels per row (may be greater than image width) 76 77 struct BufferRecord { 78 buffer_handle_t handle; 79 bool inUse; 80 BufferRecordBufferRecord81 explicit BufferRecord(buffer_handle_t h) : handle(h), inUse(false) {}; 82 }; 83 84 std::vector <BufferRecord> mBuffers; // Graphics buffers to transfer images 85 unsigned mFramesAllowed; // How many buffers are we currently using 86 unsigned mFramesInUse; // How many buffers are currently outstanding 87 88 // Which format specific function we need to use to move camera imagery into our output buffers 89 void(*mFillBufferFromVideo)(const BufferDesc& tgtBuff, uint8_t* tgt, 90 void* imgData, unsigned imgStride); 91 92 // Synchronization necessary to deconflict the capture thread from the main service thread 93 // Note that the service interface remains single threaded (ie: not reentrant) 94 std::mutex mAccessLock; 95 }; 96 97 } // namespace implementation 98 } // namespace V1_0 99 } // namespace evs 100 } // namespace automotive 101 } // namespace hardware 102 } // namespace android 103 104 #endif // ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_0_EVSV4LCAMERA_H 105