Import goldfish HAL sources from devices/generic/goldfish
We import all code here so we can customize and keep in sync with what we do on the host side more easily.
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Simon Fels
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238
android/camera/CallbackNotifier.h
Executable file
238
android/camera/CallbackNotifier.h
Executable file
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/*
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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_CALLBACK_NOTIFIER_H
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#define HW_EMULATOR_CAMERA_CALLBACK_NOTIFIER_H
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/*
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* Contains declaration of a class CallbackNotifier that manages callbacks set
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* via set_callbacks, enable_msg_type, and disable_msg_type camera HAL API.
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*/
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#include <utils/List.h>
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namespace android {
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class EmulatedCameraDevice;
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/* Manages callbacks set via set_callbacks, enable_msg_type, and disable_msg_type
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* camera HAL API.
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*
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* Objects of this class are contained in EmulatedCamera objects, and handle
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* relevant camera API callbacks.
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* Locking considerations. Apparently, it's not allowed to call callbacks
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* registered in this class, while holding a lock: recursion is quite possible,
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* which will cause a deadlock.
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*/
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class CallbackNotifier {
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public:
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/* Constructs CallbackNotifier instance. */
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CallbackNotifier();
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/* Destructs CallbackNotifier instance. */
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~CallbackNotifier();
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/****************************************************************************
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* Camera API
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***************************************************************************/
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public:
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/* Actual handler for camera_device_ops_t::set_callbacks callback.
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* This method is called by the containing emulated camera object when it is
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* handing the camera_device_ops_t::set_callbacks callback.
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*/
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void setCallbacks(camera_notify_callback notify_cb,
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camera_data_callback data_cb,
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camera_data_timestamp_callback data_cb_timestamp,
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camera_request_memory get_memory,
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void* user);
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/* Actual handler for camera_device_ops_t::enable_msg_type callback.
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* This method is called by the containing emulated camera object when it is
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* handing the camera_device_ops_t::enable_msg_type callback.
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*/
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void enableMessage(uint msg_type);
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/* Actual handler for camera_device_ops_t::disable_msg_type callback.
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* This method is called by the containing emulated camera object when it is
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* handing the camera_device_ops_t::disable_msg_type callback.
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*/
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void disableMessage(uint msg_type);
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/* Actual handler for camera_device_ops_t::store_meta_data_in_buffers
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* callback. This method is called by the containing emulated camera object
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* when it is handing the camera_device_ops_t::store_meta_data_in_buffers
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* callback.
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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 storeMetaDataInBuffers(bool enable);
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/* Enables video recording.
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* This method is called by the containing emulated camera object when it is
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* handing the camera_device_ops_t::start_recording callback.
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* Param:
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* fps - Video frame frequency. This parameter determins when a frame
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* received via onNextFrameAvailable call will be pushed through the
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* callback.
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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 enableVideoRecording(int fps);
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/* Disables video recording.
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* This method is called by the containing emulated camera object when it is
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* handing the camera_device_ops_t::stop_recording callback.
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*/
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void disableVideoRecording();
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/* Releases video frame, sent to the framework.
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* This method is called by the containing emulated camera object when it is
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* handing the camera_device_ops_t::release_recording_frame callback.
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*/
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void releaseRecordingFrame(const void* opaque);
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/* Actual handler for camera_device_ops_t::msg_type_enabled callback.
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* This method is called by the containing emulated camera object when it is
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* handing the camera_device_ops_t::msg_type_enabled callback.
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* Note: this method doesn't grab a lock while checking message status, since
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* upon exit the status would be undefined anyway. So, grab a lock before
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* calling this method if you care about persisting a defined message status.
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* Return:
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* 0 if message is disabled, or non-zero value, if message is enabled.
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*/
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inline int isMessageEnabled(uint msg_type)
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{
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return mMessageEnabler & msg_type;
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}
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/* Checks id video recording is enabled.
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* This method is called by the containing emulated camera object when it is
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* handing the camera_device_ops_t::recording_enabled callback.
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* Note: this method doesn't grab a lock while checking video recordin status,
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* since upon exit the status would be undefined anyway. So, grab a lock
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* before calling this method if you care about persisting of a defined video
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* recording status.
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* Return:
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* true if video recording is enabled, or false if it is disabled.
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*/
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inline bool isVideoRecordingEnabled()
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{
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return mVideoRecEnabled;
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}
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/****************************************************************************
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* Public API
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***************************************************************************/
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public:
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/* Resets the callback notifier. */
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void cleanupCBNotifier();
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/* Next frame is available in the camera device.
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* This is a notification callback that is invoked by the camera device when
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* a new frame is available.
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* Note that most likely this method is called in context of a worker thread
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* that camera device has created for frame capturing.
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* Param:
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* frame - Captured frame, or NULL if camera device didn't pull the frame
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* yet. If NULL is passed in this parameter use GetCurrentFrame method
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* of the camera device class to obtain the next frame. Also note that
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* the size of the frame that is passed here (as well as the frame
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* returned from the GetCurrentFrame method) is defined by the current
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* frame settings (width + height + pixel format) for the camera device.
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* timestamp - Frame's timestamp.
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* camera_dev - Camera device instance that delivered the frame.
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*/
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void onNextFrameAvailable(const void* frame,
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nsecs_t timestamp,
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EmulatedCameraDevice* camera_dev);
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/* Entry point for notifications that occur in camera device.
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* Param:
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* err - CAMERA_ERROR_XXX error code.
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*/
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void onCameraDeviceError(int err);
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/* Sets, or resets taking picture state.
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* This state control whether or not to notify the framework about compressed
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* image, shutter, and other picture related events.
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*/
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void setTakingPicture(bool taking)
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{
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mTakingPicture = taking;
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}
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/* Sets JPEG quality used to compress frame during picture taking. */
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void setJpegQuality(int jpeg_quality)
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{
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mJpegQuality = jpeg_quality;
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}
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/****************************************************************************
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* Private API
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***************************************************************************/
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protected:
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/* Checks if it's time to push new video frame.
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* Note that this method must be called while object is locked.
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* Param:
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* timestamp - Timestamp for the new frame. */
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bool isNewVideoFrameTime(nsecs_t timestamp);
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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 data change. */
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Mutex mObjectLock;
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/*
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* Callbacks, registered in set_callbacks.
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*/
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camera_notify_callback mNotifyCB;
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camera_data_callback mDataCB;
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camera_data_timestamp_callback mDataCBTimestamp;
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camera_request_memory mGetMemoryCB;
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void* mCBOpaque;
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/* video frame queue for the CameraHeapMemory destruction */
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List<camera_memory_t*> mCameraMemoryTs;
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/* Timestamp when last frame has been delivered to the framework. */
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nsecs_t mLastFrameTimestamp;
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/* Video frequency in nanosec. */
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nsecs_t mFrameRefreshFreq;
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/* Message enabler. */
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uint32_t mMessageEnabler;
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/* JPEG quality used to compress frame during picture taking. */
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int mJpegQuality;
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/* Video recording status. */
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bool mVideoRecEnabled;
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/* Picture taking status. */
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bool mTakingPicture;
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};
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}; /* namespace android */
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#endif /* HW_EMULATOR_CAMERA_CALLBACK_NOTIFIER_H */
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