/*
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* Copyright (C) 2011 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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#ifndef HW_EMULATOR_CAMERA_EMULATED_QEMU_CAMERA_DEVICE_H
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#define HW_EMULATOR_CAMERA_EMULATED_QEMU_CAMERA_DEVICE_H
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/*
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* Contains declaration of a class EmulatedQemuCameraDevice that encapsulates
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* an emulated camera device connected to the host.
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*/
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#include "EmulatedCameraDevice.h"
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#include "QemuClient.h"
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namespace android {
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class EmulatedQemuCamera;
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/* Encapsulates an emulated camera device connected to the host.
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*/
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class EmulatedQemuCameraDevice : public EmulatedCameraDevice {
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public:
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/* Constructs EmulatedQemuCameraDevice instance. */
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explicit EmulatedQemuCameraDevice(EmulatedQemuCamera* camera_hal);
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/* Destructs EmulatedQemuCameraDevice instance. */
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~EmulatedQemuCameraDevice();
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/***************************************************************************
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* Public API
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**************************************************************************/
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public:
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/* Initializes EmulatedQemuCameraDevice instance.
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* Param:
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* device_name - Name of the camera device connected to the host. The name
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* that is used here must have been reported by the 'factory' camera
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* service when it listed camera devices connected to the host.
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* Return:
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* NO_ERROR on success, or an appropriate error status.
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*/
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status_t Initialize(const char* device_name);
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/***************************************************************************
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* Emulated camera device abstract interface implementation.
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* See declarations of these methods in EmulatedCameraDevice class for
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* information on each of these methods.
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**************************************************************************/
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public:
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/* Connects to the camera device. */
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status_t connectDevice();
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/* Disconnects from the camera device. */
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status_t disconnectDevice();
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/* Starts capturing frames from the camera device. */
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status_t startDevice(int width, int height, uint32_t pix_fmt);
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/* Stops capturing frames from the camera device. */
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status_t stopDevice();
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/***************************************************************************
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* EmulatedCameraDevice virtual overrides
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* See declarations of these methods in EmulatedCameraDevice class for
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* information on each of these methods.
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**************************************************************************/
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public:
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/* Copy the current frame to |buffer| */
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status_t getCurrentFrame(void* buffer, uint32_t pixelFormat,
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int64_t* timestamp) override;
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/* Copy the current preview frame to |buffer| */
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status_t getCurrentPreviewFrame(void* buffer,
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int64_t* timestamp) override;
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/* Get a pointer to the current frame, lock it first using FrameLock in
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* EmulatedCameraDevice class */
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const void* getCurrentFrame() override;
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/***************************************************************************
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* Worker thread management overrides.
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* See declarations of these methods in EmulatedCameraDevice class for
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* information on each of these methods.
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**************************************************************************/
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protected:
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/* Implementation of the frame production routine. */
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bool produceFrame(void* buffer, int64_t* timestamp) override;
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void* getPrimaryBuffer() override;
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void* getSecondaryBuffer() override;
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/***************************************************************************
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* Qemu camera device data members
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**************************************************************************/
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private:
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/* Qemu client that is used to communicate with the 'emulated camera'
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* service, created for this instance in the emulator. */
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CameraQemuClient mQemuClient;
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/* Name of the camera device connected to the host. */
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String8 mDeviceName;
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/* Current preview framebuffer. */
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std::vector<uint32_t> mPreviewFrames[2];
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/* Since the Qemu camera needs to keep track of two buffers per frame we
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* use a pair here. One frame is the camera frame and the other is the
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* preview frame. These are in different formats and instead of converting
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* them in the guest it's more efficient to have the host provide the same
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* frame in two different formats. The first buffer in the pair is the raw
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* frame and the second buffer is the RGB encoded frame. The downside of
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* this is that we need to override the getCurrentFrame and
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* getCurrentPreviewFrame methods to extract the correct buffer from this
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* pair. */
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using FrameBufferPair = std::pair<uint8_t*, uint32_t*>;
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FrameBufferPair mFrameBufferPairs[2];
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};
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}; /* namespace android */
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#endif /* HW_EMULATOR_CAMERA_EMULATED_QEMU_CAMERA_DEVICE_H */
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