/*
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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_CAMERA_DEVICE_H
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#define HW_EMULATOR_CAMERA_EMULATED_CAMERA_DEVICE_H
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/*
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* Contains declaration of an abstract class EmulatedCameraDevice that defines
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* functionality expected from an emulated physical camera device:
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* - Obtaining and setting camera device parameters
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* - Capturing frames
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* - Streaming video
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* - etc.
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*/
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#include <utils/threads.h>
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#include <utils/KeyedVector.h>
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#include <utils/String8.h>
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#include "EmulatedCameraCommon.h"
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#include "Converters.h"
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#include "WorkerThread.h"
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#undef min
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#undef max
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#include <vector>
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namespace android {
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class EmulatedCamera;
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/* Encapsulates an abstract class EmulatedCameraDevice that defines
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* functionality expected from an emulated physical camera device:
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* - Obtaining and setting camera device parameters
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* - Capturing frames
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* - Streaming video
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* - etc.
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*/
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class EmulatedCameraDevice {
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public:
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/* Constructs EmulatedCameraDevice instance.
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* Param:
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* camera_hal - Emulated camera that implements the camera HAL API, and
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* manages (contains) this object.
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*/
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explicit EmulatedCameraDevice(EmulatedCamera* camera_hal);
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/* Destructs EmulatedCameraDevice instance. */
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virtual ~EmulatedCameraDevice();
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/***************************************************************************
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* Emulated camera device abstract interface
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**************************************************************************/
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public:
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/* Connects to the camera device.
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* This method must be called on an initialized instance of this class.
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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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virtual status_t connectDevice() = 0;
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/* Disconnects from the camera device.
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* Return:
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* NO_ERROR on success, or an appropriate error status. If this method is
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* called for already disconnected, or uninitialized instance of this class,
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* a successful status must be returned from this method. If this method is
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* called for an instance that is in the "started" state, this method must
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* return a failure.
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*/
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virtual status_t disconnectDevice() = 0;
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/* Starts the camera device.
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* This method tells the camera device to start capturing frames of the given
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* dimensions for the given pixel format. Note that this method doesn't start
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* the delivery of the captured frames to the emulated camera. Call
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* startDeliveringFrames method to start delivering frames. This method must
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* be called on a connected instance of this class. If it is called on a
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* disconnected instance, this method must return a failure.
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* Param:
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* width, height - Frame dimensions to use when capturing video frames.
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* pix_fmt - Pixel format to use when capturing video frames.
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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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virtual status_t startDevice(int width, int height, uint32_t pix_fmt) = 0;
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/* Stops the camera device.
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* This method tells the camera device to stop capturing frames. Note that
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* this method doesn't stop delivering frames to the emulated camera. Always
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* call stopDeliveringFrames prior to calling this method.
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* Return:
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* NO_ERROR on success, or an appropriate error status. If this method is
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* called for an object that is not capturing frames, or is disconnected,
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* or is uninitialized, a successful status must be returned from this
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* method.
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*/
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virtual status_t stopDevice() = 0;
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/***************************************************************************
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* Emulated camera device public API
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**************************************************************************/
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public:
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/* Initializes EmulatedCameraDevice instance.
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* Derived classes should override this method in order to cache static
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* properties of the physical device (list of supported pixel formats, frame
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* sizes, etc.) If this method is called on an already initialized instance,
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* it must return a successful status.
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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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virtual status_t Initialize();
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/* Initializes the white balance modes parameters.
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* The parameters are passed by each individual derived camera API to
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* represent that different camera manufacturers may have different
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* preferences on the white balance parameters. Green channel in the RGB
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* color space is fixed to keep the luminance to be reasonably constant.
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*
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* Param:
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* mode the text describing the current white balance mode
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* r_scale the scale factor for the R channel in RGB space
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* b_scale the scale factor for the B channel in RGB space.
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*/
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void initializeWhiteBalanceModes(const char* mode,
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const float r_scale,
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const float b_scale);
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/* Starts delivering frames captured from the camera device.
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* This method will start the worker thread that would be pulling frames from
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* the camera device, and will deliver the pulled frames back to the emulated
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* camera via onNextFrameAvailable callback. This method must be called on a
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* connected instance of this class with a started camera device. If it is
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* called on a disconnected instance, or camera device has not been started,
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* this method must return a failure.
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* Param:
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* one_burst - Controls how many frames should be delivered. If this
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* parameter is 'true', only one captured frame will be delivered to the
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* emulated camera. If this parameter is 'false', frames will keep
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* coming until stopDeliveringFrames method is called. Typically, this
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* parameter is set to 'true' only in order to obtain a single frame
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* that will be used as a "picture" in takePicture method of the
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* emulated camera.
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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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virtual status_t startDeliveringFrames(bool one_burst);
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/* Stops delivering frames captured from the camera device.
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* This method will stop the worker thread started by startDeliveringFrames.
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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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virtual status_t stopDeliveringFrames();
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/* Set the preview frame rate.
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* Indicates the rate at which the camera should provide preview frames in
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* frames per second. */
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status_t setPreviewFrameRate(int framesPerSecond);
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/* Sets the exposure compensation for the camera device.
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*/
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void setExposureCompensation(const float ev);
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/* Sets the white balance mode for the device.
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*/
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void setWhiteBalanceMode(const char* mode);
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/* Gets current framebuffer in a selected format
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* This method must be called on a connected instance of this class with a
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* started camera device. If it is called on a disconnected instance, or
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* camera device has not been started, this method must return a failure.
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* Note that this method should be called only after at least one frame has
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* been captured and delivered. Otherwise it will return garbage in the
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* preview frame buffer. Typically, this method should be called from
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* onNextFrameAvailable callback. The method can perform some basic pixel
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* format conversion for the most efficient conversions. If a conversion
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* is not supported the method will fail. Note that this does NOT require
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* that the current frame be locked using a FrameLock object.
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*
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* Param:
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* buffer - Buffer, large enough to contain the entire frame.
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* pixelFormat - The pixel format to convert to, use
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* getOriginalPixelFormat() to get the configured pixel
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* format (if using this no conversion will be needed)
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* timestamp - Receives the timestamp at which the preview frame was
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* generated.
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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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virtual status_t getCurrentFrame(void* buffer, uint32_t pixelFormat,
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int64_t* timestamp);
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/* Gets current framebuffer, converted into preview frame format.
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* This method must be called on a connected instance of this class with a
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* started camera device. If it is called on a disconnected instance, or
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* camera device has not been started, this method must return a failure.
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* Note that this method should be called only after at least one frame has
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* been captured and delivered. Otherwise it will return garbage in the
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* preview frame buffer. Typically, this method should be called from
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* onNextFrameAvailable callback. Note that this does NOT require that the
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* current frame be locked using a FrameLock object.
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* Param:
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* buffer - Buffer, large enough to contain the entire preview frame.
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* timestamp - Receives the timestamp at which the preview frame was
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* generated.
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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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virtual status_t getCurrentPreviewFrame(void* buffer, int64_t* timestamp);
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/* Gets a pointer to the current frame buffer in its raw format.
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* This method must be called on a connected instance of this class with a
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* started camera device. If it is called on a disconnected instance, or
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* camera device has not been started, this method must return NULL.
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* This method should only be called when the frame lock is held through
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* a FrameLock object. Otherwise the contents of the frame might change
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* unexpectedly or its memory could be deallocated leading to a crash.
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* Return:
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* A pointer to the current frame buffer on success, NULL otherwise.
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*/
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virtual const void* getCurrentFrame();
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class FrameLock {
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public:
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FrameLock(EmulatedCameraDevice& cameraDevice);
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~FrameLock();
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private:
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EmulatedCameraDevice& mCameraDevice;
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};
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/* Gets width of the frame obtained from the physical device.
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* Return:
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* Width of the frame obtained from the physical device. Note that value
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* returned from this method is valid only in case if camera device has been
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* started.
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*/
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inline int getFrameWidth() const
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{
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ALOGE_IF(!isStarted(), "%s: Device is not started", __FUNCTION__);
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return mFrameWidth;
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}
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/* Gets height of the frame obtained from the physical device.
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* Return:
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* Height of the frame obtained from the physical device. Note that value
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* returned from this method is valid only in case if camera device has been
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* started.
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*/
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inline int getFrameHeight() const
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{
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ALOGE_IF(!isStarted(), "%s: Device is not started", __FUNCTION__);
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return mFrameHeight;
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}
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/* Gets byte size of the current frame buffer.
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* Return:
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* Byte size of the frame buffer. Note that value returned from this method
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* is valid only in case if camera device has been started.
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*/
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inline size_t getFrameBufferSize() const
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{
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ALOGE_IF(!isStarted(), "%s: Device is not started", __FUNCTION__);
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return mFrameBufferSize;
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}
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/* Get number of bytes required to store current video frame buffer. Note
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* that this can be different from getFrameBufferSize depending on the pixel
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* format and resolution. The video frames use a pixel format that is
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* suitable for the encoding pipeline and this may have different alignment
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* requirements than the pixel format used for regular frames.
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*/
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inline size_t getVideoFrameBufferSize() const
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{
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ALOGE_IF(!isStarted(), "%s: Device is not started", __FUNCTION__);
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// Currently the video format is always YUV 420 without any kind of
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// alignment. So each pixel uses 12 bits, and then we divide by 8 to get
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// the size in bytes. If additional pixel formats are supported this
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// should be updated to take the selected video format into
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// consideration.
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return (mFrameWidth * mFrameHeight * 12) / 8;
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}
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/* Gets number of pixels in the current frame buffer.
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* Return:
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* Number of pixels in the frame buffer. Note that value returned from this
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* method is valid only in case if camera device has been started.
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*/
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inline int getPixelNum() const
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{
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ALOGE_IF(!isStarted(), "%s: Device is not started", __FUNCTION__);
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return mTotalPixels;
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}
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/* Gets pixel format of the frame that camera device streams to this class.
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* Throughout camera framework, there are three different forms of pixel
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* format representation:
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* - Original format, as reported by the actual camera device. Values for
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* this format are declared in bionic/libc/kernel/common/linux/videodev2.h
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* - String representation as defined in CameraParameters::PIXEL_FORMAT_XXX
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* strings in frameworks/base/include/camera/CameraParameters.h
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* - HAL_PIXEL_FORMAT_XXX format, as defined in system/core/include/system/graphics.h
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* Since emulated camera device gets its data from the actual device, it gets
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* pixel format in the original form. And that's the pixel format
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* representation that will be returned from this method. HAL components will
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* need to translate value returned from this method to the appropriate form.
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* This method must be called only on started instance of this class, since
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* it's applicable only when camera device is ready to stream frames.
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* Param:
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* pix_fmt - Upon success contains the original pixel format.
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* Return:
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* Current framebuffer's pixel format. Note that value returned from this
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* method is valid only in case if camera device has been started.
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*/
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inline uint32_t getOriginalPixelFormat() const
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{
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ALOGE_IF(!isStarted(), "%s: Device is not started", __FUNCTION__);
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return mPixelFormat;
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}
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/*
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* State checkers.
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*/
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inline bool isInitialized() const {
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return mState != ECDS_CONSTRUCTED;
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}
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inline bool isConnected() const {
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/* Instance is connected when its status is either"connected", or
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* "started". */
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return mState == ECDS_CONNECTED || mState == ECDS_STARTED;
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}
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inline bool isStarted() const {
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return mState == ECDS_STARTED;
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}
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/* Enable auto-focus for the camera, this is only possible between calls to
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* startPreview and stopPreview, i.e. when preview frames are being
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* delivered. This will eventually trigger a callback to the camera HAL
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* saying auto-focus completed.
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*/
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virtual status_t setAutoFocus();
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/* Cancel auto-focus if it's enabled.
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*/
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virtual status_t cancelAutoFocus();
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/* Request an asynchronous camera restart with new image parameters. The
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* restart will be performed on the same thread that delivers frames,
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* ensuring that all callbacks are done from the same thread.
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* Return
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* false if the thread request cannot be honored because no thread is
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* running or some other error occured.
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*/
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bool requestRestart(int width, int height, uint32_t pixelFormat,
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bool takingPicture, bool oneBurst);
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/****************************************************************************
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* Emulated camera device private API
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***************************************************************************/
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protected:
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/* Performs common validation and calculation of startDevice parameters.
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* Param:
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* width, height, pix_fmt - Parameters passed to the startDevice method.
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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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virtual status_t commonStartDevice(int width, int height, uint32_t pix_fmt);
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/* Performs common cleanup on stopDevice.
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* This method will undo what commonStartDevice had done.
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*/
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virtual void commonStopDevice();
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/** Computes a luminance value after taking the exposure compensation.
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* value into account.
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*
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* Param:
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* inputY - The input luminance value.
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* Return:
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* The luminance value after adjusting the exposure compensation.
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*/
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inline uint8_t changeExposure(const uint8_t& inputY) const {
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return static_cast<uint8_t>(clamp(static_cast<float>(inputY) *
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mExposureCompensation));
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}
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/** Computes the pixel value in YUV space after adjusting to the current
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* white balance mode.
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*/
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void changeWhiteBalance(uint8_t& y, uint8_t& u, uint8_t& v) const;
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/* Check if there is a pending auto-focus trigger and send a notification
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* if there is. This should be called from the worker thread loop if the
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* camera device wishes to use the default behavior of immediately sending
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* an auto-focus completion event on request. Otherwise the device should
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* implement its own auto-focus behavior. */
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void checkAutoFocusTrigger();
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/* Implementation for getCurrentFrame that includes pixel format conversion
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* if needed. This allows subclasses to easily use this method instead of
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* having to reimplement the conversion all over.
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*/
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status_t getCurrentFrameImpl(const uint8_t* source, uint8_t* dest,
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uint32_t pixelFormat) const;
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/****************************************************************************
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* Worker thread management.
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* Typicaly when emulated camera device starts capturing frames from the
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* actual device, it does that in a worker thread created in StartCapturing,
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* and terminated in StopCapturing. Since this is such a typical scenario,
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* it makes sence to encapsulate worker thread management in the base class
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* for all emulated camera devices.
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***************************************************************************/
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protected:
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/* Starts the worker thread.
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* Typically, the worker thread is started from the startDeliveringFrames
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* method of this class.
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* Param:
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* one_burst - Controls how many times thread loop should run. If this
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* parameter is 'true', thread routine will run only once If this
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* parameter is 'false', thread routine will run until
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* stopWorkerThreads method is called. See startDeliveringFrames for
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* more info.
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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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virtual status_t startWorkerThread(bool one_burst);
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/* Stop the worker thread.
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* Note that this method will always wait for the worker thread to
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* terminate. Typically, the worker thread is stopped from the
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* stopDeliveringFrames method of this class.
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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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virtual status_t stopWorkerThread();
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/* Produce a camera frame and place it in buffer. The buffer is one of
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* the two buffers provided to mFrameProducer during construction along with
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* a pointer to this method. The method is expected to know what size frames
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* it provided to the producer thread. Returning false indicates an
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* unrecoverable error that will stop the frame production thread. */
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virtual bool produceFrame(void* buffer, int64_t* timestamp) = 0;
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/* Get the primary buffer to use when constructing the FrameProducer. */
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virtual void* getPrimaryBuffer() {
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return mFrameBuffers[0].data();
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}
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/* Get the seconary buffer to use when constructing the FrameProducer. */
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virtual void* getSecondaryBuffer() {
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return mFrameBuffers[1].data();
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}
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/* A class that encaspulates the asynchronous behavior of a camera. This
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* includes asynchronous production (through another thread), frame delivery
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* as well as asynchronous state changes that have to be synchronized with
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* frame production and delivery but can't be blocking the camera HAL. */
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class CameraThread : public WorkerThread {
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public:
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typedef bool (*ProduceFrameFunc)(void* opaque,
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void* destinationBuffer,
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int64_t* destinationTimestamp);
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CameraThread(EmulatedCameraDevice* cameraDevice,
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ProduceFrameFunc producer,
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void* producerOpaque);
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/* Access the primary buffer of the frame producer, this is the frame
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* that is currently not being written to. The buffer will only have
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* valid contents if hasFrame() returns true. Note that accessing this
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* without first having created a Lock can lead to contents changing
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* without notice. */
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const void* getPrimaryBuffer() const;
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int64_t getPrimaryTimestamp() const;
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/* Lock and unlock the primary buffer */
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void lockPrimaryBuffer();
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void unlockPrimaryBuffer();
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void requestRestart(int width, int height, uint32_t pixelFormat,
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bool takingPicture, bool oneBurst);
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private:
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bool checkRestartRequest();
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bool waitForFrameOrTimeout(nsecs_t timeout);
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bool inWorkerThread() override;
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status_t onThreadStart() override;
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void onThreadExit() override;
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/* A class with a thread that will call a function at a specified
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* interval to produce frames. This is done in a double-buffered fashion
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* to make sure that one of the frames can be delivered without risk of
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* overwriting its contents. Access to the primary buffer, the one NOT
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* being drawn to, should be protected with the lock methods provided or
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* the guarantee of not overwriting the contents does not hold.
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*/
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class FrameProducer : public WorkerThread {
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public:
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FrameProducer(EmulatedCameraDevice* cameraDevice,
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ProduceFrameFunc producer, void* opaque,
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void* primaryBuffer, void* secondaryBuffer);
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/* Indicates if the producer has produced at least one frame. */
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bool hasFrame() const;
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const void* getPrimaryBuffer() const;
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int64_t getPrimaryTimestamp() const;
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void lockPrimaryBuffer();
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void unlockPrimaryBuffer();
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protected:
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bool inWorkerThread() override;
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ProduceFrameFunc mProducer;
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void* mOpaque;
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void* mPrimaryBuffer;
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void* mSecondaryBuffer;
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int64_t mPrimaryTimestamp;
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int64_t mSecondaryTimestamp;
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nsecs_t mLastFrame;
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mutable Mutex mBufferMutex;
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std::atomic<bool> mHasFrame;
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};
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nsecs_t mCurFrameTimestamp;
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/* Worker thread that will produce frames for the camera thread */
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sp<FrameProducer> mFrameProducer;
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ProduceFrameFunc mProducerFunc;
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void* mProducerOpaque;
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Mutex mRequestMutex;
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int mRestartWidth;
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int mRestartHeight;
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uint32_t mRestartPixelFormat;
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bool mRestartOneBurst;
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bool mRestartTakingPicture;
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bool mRestartRequested;
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};
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/****************************************************************************
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* Data members
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***************************************************************************/
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protected:
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/* Locks this instance for parameters, state, etc. change. */
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Mutex mObjectLock;
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/* A camera thread that is used in frame production, delivery and handling
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* of asynchronous restarts. Internally the process of generating and
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* delivering frames is split up into two threads. This way frames can
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* always be delivered on time even if they cannot be produced fast enough
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* to keep up with the expected frame rate. It also increases performance on
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* multi-core systems. If the producer cannot keep up the last frame will
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* simply be delivered again. */
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sp<CameraThread> mCameraThread;
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/* Emulated camera object containing this instance. */
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EmulatedCamera* mCameraHAL;
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/* Framebuffers containing the frame being drawn to and the frame being
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* delivered. This is used by the double buffering producer thread and
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* the consumer thread will copy frames from one of these buffers to
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* mCurrentFrame to avoid being stalled by frame production. */
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std::vector<uint8_t> mFrameBuffers[2];
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/*
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* Framebuffer properties.
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*/
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/* Byte size of the framebuffer. */
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size_t mFrameBufferSize;
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/* Original pixel format (one of the V4L2_PIX_FMT_XXX values, as defined in
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* bionic/libc/kernel/common/linux/videodev2.h */
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uint32_t mPixelFormat;
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/* Frame width */
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int mFrameWidth;
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/* Frame height */
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int mFrameHeight;
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/* The number of frames per second that the camera should deliver */
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int mFramesPerSecond;
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/* Defines byte distance between the start of each Y row */
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int mYStride;
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/* Defines byte distance between the start of each U/V row. For formats with
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* separate U and V planes this is the distance between rows in each plane.
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* For formats with interleaved U and V components this is the distance
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* between rows in the interleaved plane, meaning that it's the stride over
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* the combined U and V components. */
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int mUVStride;
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/* Total number of pixels */
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int mTotalPixels;
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/* Exposure compensation value */
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float mExposureCompensation;
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float* mWhiteBalanceScale;
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DefaultKeyedVector<String8, float*> mSupportedWhiteBalanceScale;
|
|
/* Defines possible states of the emulated camera device object.
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*/
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enum EmulatedCameraDeviceState {
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/* Object has been constructed. */
|
ECDS_CONSTRUCTED,
|
/* Object has been initialized. */
|
ECDS_INITIALIZED,
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/* Object has been connected to the physical device. */
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ECDS_CONNECTED,
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/* Camera device has been started. */
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ECDS_STARTED,
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};
|
|
/* Object state. */
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EmulatedCameraDeviceState mState;
|
|
private:
|
/* Lock the current frame so that it can safely be accessed using
|
* getCurrentFrame. Prefer using a FrameLock object on the stack instead
|
* to ensure that the lock is always unlocked properly.
|
*/
|
void lockCurrentFrame();
|
/* Unlock the current frame after locking it. Prefer using a FrameLock
|
* object instead.
|
*/
|
void unlockCurrentFrame();
|
|
static bool staticProduceFrame(void* opaque, void* buffer,
|
int64_t* timestamp) {
|
auto cameraDevice = reinterpret_cast<EmulatedCameraDevice*>(opaque);
|
return cameraDevice->produceFrame(buffer, timestamp);
|
}
|
|
/* A flag indicating if an auto-focus completion event should be sent the
|
* next time the worker thread runs. This implies that auto-focus completion
|
* event can only be delivered while preview frames are being delivered.
|
* This is also a requirement specified in the documentation where a request
|
* to perform auto-focusing is only valid between calls to startPreview and
|
* stopPreview.
|
* https://developer.android.com/reference/android/hardware/Camera.html#autoFocus(android.hardware.Camera.AutoFocusCallback)
|
*/
|
std::atomic<bool> mTriggerAutoFocus;
|
};
|
|
}; /* namespace android */
|
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#endif /* HW_EMULATOR_CAMERA_EMULATED_CAMERA_DEVICE_H */
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