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119 lines
4.5 KiB
119 lines
4.5 KiB
/* |
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* Copyright (C) 2016 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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// Loosely based on hardware/libhardware/modules/camera/ExampleCamera.h |
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#ifndef V4L2_CAMERA_HAL_V4L2_CAMERA_H_ |
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#define V4L2_CAMERA_HAL_V4L2_CAMERA_H_ |
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#include <array> |
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#include <condition_variable> |
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#include <map> |
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#include <queue> |
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#include <string> |
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#include <camera/CameraMetadata.h> |
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#include <utils/StrongPointer.h> |
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#include <utils/Thread.h> |
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#include "camera.h" |
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#include "common.h" |
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#include "metadata/metadata.h" |
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#include "v4l2_wrapper.h" |
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namespace v4l2_camera_hal { |
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// V4L2Camera is a specific V4L2-supported camera device. The Camera object |
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// contains all logic common between all cameras (e.g. front and back cameras), |
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// while a specific camera device (e.g. V4L2Camera) holds all specific |
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// metadata and logic about that device. |
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class V4L2Camera : public default_camera_hal::Camera { |
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public: |
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// Use this method to create V4L2Camera objects. Functionally equivalent |
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// to "new V4L2Camera", except that it may return nullptr in case of failure. |
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static V4L2Camera* NewV4L2Camera(int id, const std::string path); |
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~V4L2Camera(); |
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private: |
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// Constructor private to allow failing on bad input. |
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// Use NewV4L2Camera instead. |
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V4L2Camera(int id, |
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std::shared_ptr<V4L2Wrapper> v4l2_wrapper, |
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std::unique_ptr<Metadata> metadata); |
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// default_camera_hal::Camera virtual methods. |
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// Connect to the device: open dev nodes, etc. |
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int connect() override; |
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// Disconnect from the device: close dev nodes, etc. |
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void disconnect() override; |
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// Initialize static camera characteristics for individual device. |
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int initStaticInfo(android::CameraMetadata* out) override; |
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// Initialize a template of the given type. |
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int initTemplate(int type, android::CameraMetadata* out) override; |
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// Initialize device info: resource cost and conflicting devices |
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// (/conflicting devices length). |
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void initDeviceInfo(camera_info_t* info) override; |
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// Extra initialization of device when opened. |
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int initDevice() override; |
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// Verify stream configuration dataspaces and rotation values |
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bool validateDataspacesAndRotations( |
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const camera3_stream_configuration_t* stream_config) override; |
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// Set up the streams, including seting usage & max_buffers |
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int setupStreams(camera3_stream_configuration_t* stream_config) override; |
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// Verify settings are valid for a capture or reprocessing. |
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bool isValidRequestSettings(const android::CameraMetadata& settings) override; |
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// Enqueue a request to receive data from the camera. |
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int enqueueRequest( |
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std::shared_ptr<default_camera_hal::CaptureRequest> request) override; |
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// Flush in flight buffers. |
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int flushBuffers() override; |
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// Async request processing helpers. |
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// Dequeue a request from the waiting queue. |
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// Blocks until a request is available. |
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std::shared_ptr<default_camera_hal::CaptureRequest> dequeueRequest(); |
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// Thread functions. Return true to loop, false to exit. |
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// Pass buffers for enqueued requests to the device. |
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bool enqueueRequestBuffers(); |
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// Retreive buffers from the device. |
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bool dequeueRequestBuffers(); |
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// V4L2 helper. |
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std::shared_ptr<V4L2Wrapper> device_; |
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std::unique_ptr<V4L2Wrapper::Connection> connection_; |
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std::unique_ptr<Metadata> metadata_; |
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std::mutex request_queue_lock_; |
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std::queue<std::shared_ptr<default_camera_hal::CaptureRequest>> |
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request_queue_; |
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std::mutex in_flight_lock_; |
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// Maps buffer index : request. |
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std::map<uint32_t, std::shared_ptr<default_camera_hal::CaptureRequest>> |
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in_flight_; |
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// Threads require holding an Android strong pointer. |
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android::sp<android::Thread> buffer_enqueuer_; |
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android::sp<android::Thread> buffer_dequeuer_; |
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std::condition_variable requests_available_; |
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std::condition_variable buffers_in_flight_; |
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int32_t max_input_streams_; |
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std::array<int, 3> max_output_streams_; // {raw, non-stalling, stalling}. |
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DISALLOW_COPY_AND_ASSIGN(V4L2Camera); |
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}; |
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} // namespace v4l2_camera_hal |
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#endif // V4L2_CAMERA_HAL_V4L2_CAMERA_H_
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