services/camera/libcameraservice/device3/Camera3StreamInterface.h - LeafOS-Project/android_frameworks_av - Gitiles

 /*
  * Copyright (C) 2013 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #ifndef ANDROID_SERVERS_CAMERA3_STREAM_INTERFACE_H
 #define ANDROID_SERVERS_CAMERA3_STREAM_INTERFACE_H

 #include <utils/RefBase.h>

 #include <camera/CameraMetadata.h>
 #include "Camera3StreamBufferListener.h"
 #include "Camera3StreamBufferFreedListener.h"

 struct camera3_stream_buffer;

 namespace android {

 namespace camera3 {

 enum {
     /**
      * This stream set ID indicates that the set ID is invalid, and this stream doesn't intend to
      * share buffers with any other stream. It is illegal to register this kind of stream to
      * Camera3BufferManager.
      */
     CAMERA3_STREAM_SET_ID_INVALID = -1,

     /**
      * Invalid output stream ID.
      */
     CAMERA3_STREAM_ID_INVALID = -1,
 };

 class StatusTracker;

 // OutputStreamInfo describes the property of a camera stream.
 class OutputStreamInfo {
     public:
         int width;
         int height;
         int format;
         android_dataspace dataSpace;
         uint64_t consumerUsage;
         bool finalized = false;
         OutputStreamInfo() :
             width(-1), height(-1), format(-1), dataSpace(HAL_DATASPACE_UNKNOWN),
             consumerUsage(0) {}
         OutputStreamInfo(int _width, int _height, int _format, android_dataspace _dataSpace,
                 uint64_t _consumerUsage) :
             width(_width), height(_height), format(_format),
             dataSpace(_dataSpace), consumerUsage(_consumerUsage) {}
 };

 /**
  * An interface for managing a single stream of input and/or output data from
  * the camera device.
  */
 class Camera3StreamInterface : public virtual RefBase {
   public:

     enum {
         ALLOCATE_PIPELINE_MAX = 0, // Allocate max buffers used by a given surface
     };

     /**
      * Get the stream's ID
      */
     virtual int      getId() const = 0;

     /**
      * Get the output stream set id.
      */
     virtual int      getStreamSetId() const = 0;

     /**
      * Get the stream's dimensions and format
      */
     virtual uint32_t getWidth() const = 0;
     virtual uint32_t getHeight() const = 0;
     virtual int      getFormat() const = 0;
     virtual android_dataspace getDataSpace() const = 0;
     virtual void setFormatOverride(bool formatOverriden) = 0;
     virtual bool isFormatOverridden() const = 0;
     virtual int getOriginalFormat() const = 0;
     virtual void setDataSpaceOverride(bool dataSpaceOverriden) = 0;
     virtual bool isDataSpaceOverridden() const = 0;
     virtual android_dataspace getOriginalDataSpace() const = 0;

     /**
      * Get a HAL3 handle for the stream, without starting stream configuration.
      */
     virtual camera3_stream* asHalStream() = 0;

     /**
      * Start the stream configuration process. Returns a handle to the stream's
      * information to be passed into the HAL device's configure_streams call.
      *
      * Until finishConfiguration() is called, no other methods on the stream may
      * be called. The usage and max_buffers fields of camera3_stream may be
      * modified between start/finishConfiguration, but may not be changed after
      * that. The priv field of camera3_stream may be modified at any time after
      * startConfiguration.
      *
      * Returns NULL in case of error starting configuration.
      */
     virtual camera3_stream* startConfiguration() = 0;

     /**
      * Check if the stream is mid-configuration (start has been called, but not
      * finish).  Used for lazy completion of configuration.
      */
     virtual bool    isConfiguring() const = 0;

     /**
      * Completes the stream configuration process. During this call, the stream
      * may call the device's register_stream_buffers() method. The stream
      * information structure returned by startConfiguration() may no longer be
      * modified after this call, but can still be read until the destruction of
      * the stream.
      *
      * streamReconfigured: set to true when a stream is being reconfigured.
      *
      * Returns:
      *   OK on a successful configuration
      *   NO_INIT in case of a serious error from the HAL device
      *   NO_MEMORY in case of an error registering buffers
      *   INVALID_OPERATION in case connecting to the consumer failed
      */
     virtual status_t finishConfiguration(/*out*/bool* streamReconfigured = nullptr) = 0;

     /**
      * Cancels the stream configuration process. This returns the stream to the
      * initial state, allowing it to be configured again later.
      * This is done if the HAL rejects the proposed combined stream configuration
      */
     virtual status_t cancelConfiguration() = 0;

     /**
      * Determine whether the stream has already become in-use (has received
      * a valid filled buffer), which determines if a stream can still have
      * prepareNextBuffer called on it.
      */
     virtual bool     isUnpreparable() = 0;

     /**
      * Start stream preparation. May only be called in the CONFIGURED state,
      * when no valid buffers have yet been returned to this stream. Prepares
      * up to maxCount buffers, or the maximum number of buffers needed by the
      * pipeline if maxCount is ALLOCATE_PIPELINE_MAX.
      *
      * If no prepartion is necessary, returns OK and does not transition to
      * PREPARING state. Otherwise, returns NOT_ENOUGH_DATA and transitions
      * to PREPARING.
      *
      * blockRequest specifies whether prepare will block upcoming capture
      * request. This flag should only be set to false if the caller guarantees
      * the whole buffer preparation process is done before capture request
      * comes in.
      *
      * Returns:
      *    OK if no more buffers need to be preallocated
      *    NOT_ENOUGH_DATA if calls to prepareNextBuffer are needed to finish
      *        buffer pre-allocation, and transitions to the PREPARING state.
      *    NO_INIT in case of a serious error from the HAL device
      *    INVALID_OPERATION if called when not in CONFIGURED state, or a
      *        valid buffer has already been returned to this stream.
      */
     virtual status_t startPrepare(int maxCount, bool blockRequest) = 0;

     /**
      * Check if the request on a stream is blocked by prepare.
      */
     virtual bool     isBlockedByPrepare() const = 0;

     /**
      * Continue stream buffer preparation by allocating the next
      * buffer for this stream.  May only be called in the PREPARED state.
      *
      * Returns OK and transitions to the CONFIGURED state if all buffers
      * are allocated after the call concludes. Otherwise returns NOT_ENOUGH_DATA.
      *
      * Returns:
      *    OK if no more buffers need to be preallocated, and transitions
      *        to the CONFIGURED state.
      *    NOT_ENOUGH_DATA if more calls to prepareNextBuffer are needed to finish
      *        buffer pre-allocation.
      *    NO_INIT in case of a serious error from the HAL device
      *    INVALID_OPERATION if called when not in CONFIGURED state, or a
      *        valid buffer has already been returned to this stream.
      */
     virtual status_t prepareNextBuffer() = 0;

     /**
      * Cancel stream preparation early. In case allocation needs to be
      * stopped, this method transitions the stream back to the CONFIGURED state.
      * Buffers that have been allocated with prepareNextBuffer remain that way,
      * but a later use of prepareNextBuffer will require just as many
      * calls as if the earlier prepare attempt had not existed.
      *
      * Returns:
      *    OK if cancellation succeeded, and transitions to the CONFIGURED state
      *    INVALID_OPERATION if not in the PREPARING state
      *    NO_INIT in case of a serious error from the HAL device
      */
     virtual status_t cancelPrepare() = 0;

     /**
      * Tear down memory for this stream. This frees all unused gralloc buffers
      * allocated for this stream, but leaves it ready for operation afterward.
      *
      * May only be called in the CONFIGURED state, and keeps the stream in
      * the CONFIGURED state.
      *
      * Returns:
      *    OK if teardown succeeded.
      *    INVALID_OPERATION if not in the CONFIGURED state
      *    NO_INIT in case of a serious error from the HAL device
      */
     virtual status_t tearDown() = 0;

     /**
      * Fill in the camera3_stream_buffer with the next valid buffer for this
      * stream, to hand over to the HAL.
      *
      * Multiple surfaces could share the same HAL stream, but a request may
      * be only for a subset of surfaces. In this case, the
      * Camera3StreamInterface object needs the surface ID information to acquire
      * buffers for those surfaces. For the case of single surface for a HAL
      * stream, surface_ids parameter has no effect.
      *
      * This method may only be called once finishConfiguration has been called.
      * For bidirectional streams, this method applies to the output-side
      * buffers.
      *
      */
     virtual status_t getBuffer(camera3_stream_buffer *buffer,
             nsecs_t waitBufferTimeout,
             const std::vector<size_t>& surface_ids = std::vector<size_t>()) = 0;

     /**
      * Return a buffer to the stream after use by the HAL.
      *
      * Multiple surfaces could share the same HAL stream, but a request may
      * be only for a subset of surfaces. In this case, the
      * Camera3StreamInterface object needs the surface ID information to attach
      * buffers for those surfaces. For the case of single surface for a HAL
      * stream, surface_ids parameter has no effect.
      *
      * This method may only be called for buffers provided by getBuffer().
      * For bidirectional streams, this method applies to the output-side buffers
      */
     virtual status_t returnBuffer(const camera3_stream_buffer &buffer,
             nsecs_t timestamp, bool timestampIncreasing = true,
             const std::vector<size_t>& surface_ids = std::vector<size_t>(),
             uint64_t frameNumber = 0) = 0;

     /**
      * Fill in the camera3_stream_buffer with the next valid buffer for this
      * stream, to hand over to the HAL.
      *
      * This method may only be called once finishConfiguration has been called.
      * For bidirectional streams, this method applies to the input-side
      * buffers.
      *
      * Normally this call will block until the handed out buffer count is less than the stream
      * max buffer count; if respectHalLimit is set to false, this is ignored.
      */
     virtual status_t getInputBuffer(camera3_stream_buffer *buffer, bool respectHalLimit = true) = 0;

     /**
      * Return a buffer to the stream after use by the HAL.
      *
      * This method may only be called for buffers provided by getBuffer().
      * For bidirectional streams, this method applies to the input-side buffers
      */
     virtual status_t returnInputBuffer(const camera3_stream_buffer &buffer) = 0;

     /**
      * Get the buffer producer of the input buffer queue.
      *
      * This method only applies to input streams.
      */
     virtual status_t getInputBufferProducer(sp<IGraphicBufferProducer> *producer) = 0;

     /**
      * Whether any of the stream's buffers are currently in use by the HAL,
      * including buffers that have been returned but not yet had their
      * release fence signaled.
      */
     virtual bool     hasOutstandingBuffers() const = 0;

     /**
      * Get number of buffers currently handed out to HAL
      */
     virtual size_t   getOutstandingBuffersCount() const = 0;

     enum {
         TIMEOUT_NEVER = -1
     };

     /**
      * Set the state tracker to use for signaling idle transitions.
      */
     virtual status_t setStatusTracker(sp<StatusTracker> statusTracker) = 0;

     /**
      * Disconnect stream from its non-HAL endpoint. After this,
      * start/finishConfiguration must be called before the stream can be used
      * again. This cannot be called if the stream has outstanding dequeued
      * buffers.
      */
     virtual status_t disconnect() = 0;

     /**
      * Return if the buffer queue of the stream is abandoned.
      */
     virtual bool isAbandoned() const = 0;

     /**
      * Debug dump of the stream's state.
      */
     virtual void     dump(int fd, const Vector<String16> &args) const = 0;

     virtual void     addBufferListener(
             wp<Camera3StreamBufferListener> listener) = 0;
     virtual void     removeBufferListener(
             const sp<Camera3StreamBufferListener>& listener) = 0;

     /**
      * Setting listner will remove previous listener (if exists)
      * Only allow set listener during stream configuration because stream is guaranteed to be IDLE
      * at this state, so setBufferFreedListener won't collide with onBufferFreed callbacks.
      * Client is responsible to keep the listener object alive throughout the lifecycle of this
      * Camera3Stream.
      */
     virtual void setBufferFreedListener(wp<Camera3StreamBufferFreedListener> listener) = 0;

     /**
      * Notify buffer stream listeners about incoming request with particular frame number.
      */
     virtual void fireBufferRequestForFrameNumber(uint64_t frameNumber,
             const CameraMetadata& settings) = 0;
 };

 } // namespace camera3

 } // namespace android

 #endif
	/*
	* Copyright (C) 2013 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#ifndef ANDROID_SERVERS_CAMERA3_STREAM_INTERFACE_H
	#define ANDROID_SERVERS_CAMERA3_STREAM_INTERFACE_H

	#include <utils/RefBase.h>

	#include <camera/CameraMetadata.h>
	#include "Camera3StreamBufferListener.h"
	#include "Camera3StreamBufferFreedListener.h"

	struct camera3_stream_buffer;

	namespace android {

	namespace camera3 {

	enum {
	/**
	* This stream set ID indicates that the set ID is invalid, and this stream doesn't intend to
	* share buffers with any other stream. It is illegal to register this kind of stream to
	* Camera3BufferManager.
	*/
	CAMERA3_STREAM_SET_ID_INVALID = -1,

	/**
	* Invalid output stream ID.
	*/
	CAMERA3_STREAM_ID_INVALID = -1,
	};

	class StatusTracker;

	// OutputStreamInfo describes the property of a camera stream.
	class OutputStreamInfo {
	public:
	int width;
	int height;
	int format;
	android_dataspace dataSpace;
	uint64_t consumerUsage;
	bool finalized = false;
	OutputStreamInfo() :
	width(-1), height(-1), format(-1), dataSpace(HAL_DATASPACE_UNKNOWN),
	consumerUsage(0) {}
	OutputStreamInfo(int _width, int _height, int _format, android_dataspace _dataSpace,
	uint64_t _consumerUsage) :
	width(_width), height(_height), format(_format),
	dataSpace(_dataSpace), consumerUsage(_consumerUsage) {}
	};

	/**
	* An interface for managing a single stream of input and/or output data from
	* the camera device.
	*/
	class Camera3StreamInterface : public virtual RefBase {
	public:

	enum {
	ALLOCATE_PIPELINE_MAX = 0, // Allocate max buffers used by a given surface
	};

	/**
	* Get the stream's ID
	*/
	virtual int getId() const = 0;

	/**
	* Get the output stream set id.
	*/
	virtual int getStreamSetId() const = 0;

	/**
	* Get the stream's dimensions and format
	*/
	virtual uint32_t getWidth() const = 0;
	virtual uint32_t getHeight() const = 0;
	virtual int getFormat() const = 0;
	virtual android_dataspace getDataSpace() const = 0;
	virtual void setFormatOverride(bool formatOverriden) = 0;
	virtual bool isFormatOverridden() const = 0;
	virtual int getOriginalFormat() const = 0;
	virtual void setDataSpaceOverride(bool dataSpaceOverriden) = 0;
	virtual bool isDataSpaceOverridden() const = 0;
	virtual android_dataspace getOriginalDataSpace() const = 0;

	/**
	* Get a HAL3 handle for the stream, without starting stream configuration.
	*/
	virtual camera3_stream* asHalStream() = 0;

	/**
	* Start the stream configuration process. Returns a handle to the stream's
	* information to be passed into the HAL device's configure_streams call.
	*
	* Until finishConfiguration() is called, no other methods on the stream may
	* be called. The usage and max_buffers fields of camera3_stream may be
	* modified between start/finishConfiguration, but may not be changed after
	* that. The priv field of camera3_stream may be modified at any time after
	* startConfiguration.
	*
	* Returns NULL in case of error starting configuration.
	*/
	virtual camera3_stream* startConfiguration() = 0;

	/**
	* Check if the stream is mid-configuration (start has been called, but not
	* finish). Used for lazy completion of configuration.
	*/
	virtual bool isConfiguring() const = 0;

	/**
	* Completes the stream configuration process. During this call, the stream
	* may call the device's register_stream_buffers() method. The stream
	* information structure returned by startConfiguration() may no longer be
	* modified after this call, but can still be read until the destruction of
	* the stream.
	*
	* streamReconfigured: set to true when a stream is being reconfigured.
	*
	* Returns:
	* OK on a successful configuration
	* NO_INIT in case of a serious error from the HAL device
	* NO_MEMORY in case of an error registering buffers
	* INVALID_OPERATION in case connecting to the consumer failed
	*/
	virtual status_t finishConfiguration(/out/bool* streamReconfigured = nullptr) = 0;

	/**
	* Cancels the stream configuration process. This returns the stream to the
	* initial state, allowing it to be configured again later.
	* This is done if the HAL rejects the proposed combined stream configuration
	*/
	virtual status_t cancelConfiguration() = 0;

	/**
	* Determine whether the stream has already become in-use (has received
	* a valid filled buffer), which determines if a stream can still have
	* prepareNextBuffer called on it.
	*/
	virtual bool isUnpreparable() = 0;

	/**
	* Start stream preparation. May only be called in the CONFIGURED state,
	* when no valid buffers have yet been returned to this stream. Prepares
	* up to maxCount buffers, or the maximum number of buffers needed by the
	* pipeline if maxCount is ALLOCATE_PIPELINE_MAX.
	*
	* If no prepartion is necessary, returns OK and does not transition to
	* PREPARING state. Otherwise, returns NOT_ENOUGH_DATA and transitions
	* to PREPARING.
	*
	* blockRequest specifies whether prepare will block upcoming capture
	* request. This flag should only be set to false if the caller guarantees
	* the whole buffer preparation process is done before capture request
	* comes in.
	*
	* Returns:
	* OK if no more buffers need to be preallocated
	* NOT_ENOUGH_DATA if calls to prepareNextBuffer are needed to finish
	* buffer pre-allocation, and transitions to the PREPARING state.
	* NO_INIT in case of a serious error from the HAL device
	* INVALID_OPERATION if called when not in CONFIGURED state, or a
	* valid buffer has already been returned to this stream.
	*/
	virtual status_t startPrepare(int maxCount, bool blockRequest) = 0;

	/**
	* Check if the request on a stream is blocked by prepare.
	*/
	virtual bool isBlockedByPrepare() const = 0;

	/**
	* Continue stream buffer preparation by allocating the next
	* buffer for this stream. May only be called in the PREPARED state.
	*
	* Returns OK and transitions to the CONFIGURED state if all buffers
	* are allocated after the call concludes. Otherwise returns NOT_ENOUGH_DATA.
	*
	* Returns:
	* OK if no more buffers need to be preallocated, and transitions
	* to the CONFIGURED state.
	* NOT_ENOUGH_DATA if more calls to prepareNextBuffer are needed to finish
	* buffer pre-allocation.
	* NO_INIT in case of a serious error from the HAL device
	* INVALID_OPERATION if called when not in CONFIGURED state, or a
	* valid buffer has already been returned to this stream.
	*/
	virtual status_t prepareNextBuffer() = 0;

	/**
	* Cancel stream preparation early. In case allocation needs to be
	* stopped, this method transitions the stream back to the CONFIGURED state.
	* Buffers that have been allocated with prepareNextBuffer remain that way,
	* but a later use of prepareNextBuffer will require just as many
	* calls as if the earlier prepare attempt had not existed.
	*
	* Returns:
	* OK if cancellation succeeded, and transitions to the CONFIGURED state
	* INVALID_OPERATION if not in the PREPARING state
	* NO_INIT in case of a serious error from the HAL device
	*/
	virtual status_t cancelPrepare() = 0;

	/**
	* Tear down memory for this stream. This frees all unused gralloc buffers
	* allocated for this stream, but leaves it ready for operation afterward.
	*
	* May only be called in the CONFIGURED state, and keeps the stream in
	* the CONFIGURED state.
	*
	* Returns:
	* OK if teardown succeeded.
	* INVALID_OPERATION if not in the CONFIGURED state
	* NO_INIT in case of a serious error from the HAL device
	*/
	virtual status_t tearDown() = 0;

	/**
	* Fill in the camera3_stream_buffer with the next valid buffer for this
	* stream, to hand over to the HAL.
	*
	* Multiple surfaces could share the same HAL stream, but a request may
	* be only for a subset of surfaces. In this case, the
	* Camera3StreamInterface object needs the surface ID information to acquire
	* buffers for those surfaces. For the case of single surface for a HAL
	* stream, surface_ids parameter has no effect.
	*
	* This method may only be called once finishConfiguration has been called.
	* For bidirectional streams, this method applies to the output-side
	* buffers.
	*
	*/
	virtual status_t getBuffer(camera3_stream_buffer *buffer,
	nsecs_t waitBufferTimeout,
	const std::vector<size_t>& surface_ids = std::vector<size_t>()) = 0;

	/**
	* Return a buffer to the stream after use by the HAL.
	*
	* Multiple surfaces could share the same HAL stream, but a request may
	* be only for a subset of surfaces. In this case, the
	* Camera3StreamInterface object needs the surface ID information to attach
	* buffers for those surfaces. For the case of single surface for a HAL
	* stream, surface_ids parameter has no effect.
	*
	* This method may only be called for buffers provided by getBuffer().
	* For bidirectional streams, this method applies to the output-side buffers
	*/
	virtual status_t returnBuffer(const camera3_stream_buffer &buffer,
	nsecs_t timestamp, bool timestampIncreasing = true,
	const std::vector<size_t>& surface_ids = std::vector<size_t>(),
	uint64_t frameNumber = 0) = 0;

	/**
	* Fill in the camera3_stream_buffer with the next valid buffer for this
	* stream, to hand over to the HAL.
	*
	* This method may only be called once finishConfiguration has been called.
	* For bidirectional streams, this method applies to the input-side
	* buffers.
	*
	* Normally this call will block until the handed out buffer count is less than the stream
	* max buffer count; if respectHalLimit is set to false, this is ignored.
	*/
	virtual status_t getInputBuffer(camera3_stream_buffer *buffer, bool respectHalLimit = true) = 0;

	/**
	* Return a buffer to the stream after use by the HAL.
	*
	* This method may only be called for buffers provided by getBuffer().
	* For bidirectional streams, this method applies to the input-side buffers
	*/
	virtual status_t returnInputBuffer(const camera3_stream_buffer &buffer) = 0;

	/**
	* Get the buffer producer of the input buffer queue.
	*
	* This method only applies to input streams.
	*/
	virtual status_t getInputBufferProducer(sp<IGraphicBufferProducer> *producer) = 0;

	/**
	* Whether any of the stream's buffers are currently in use by the HAL,
	* including buffers that have been returned but not yet had their
	* release fence signaled.
	*/
	virtual bool hasOutstandingBuffers() const = 0;

	/**
	* Get number of buffers currently handed out to HAL
	*/
	virtual size_t getOutstandingBuffersCount() const = 0;

	enum {
	TIMEOUT_NEVER = -1
	};

	/**
	* Set the state tracker to use for signaling idle transitions.
	*/
	virtual status_t setStatusTracker(sp<StatusTracker> statusTracker) = 0;

	/**
	* Disconnect stream from its non-HAL endpoint. After this,
	* start/finishConfiguration must be called before the stream can be used
	* again. This cannot be called if the stream has outstanding dequeued
	* buffers.
	*/
	virtual status_t disconnect() = 0;

	/**
	* Return if the buffer queue of the stream is abandoned.
	*/
	virtual bool isAbandoned() const = 0;

	/**
	* Debug dump of the stream's state.
	*/
	virtual void dump(int fd, const Vector<String16> &args) const = 0;

	virtual void addBufferListener(
	wp<Camera3StreamBufferListener> listener) = 0;
	virtual void removeBufferListener(
	const sp<Camera3StreamBufferListener>& listener) = 0;

	/**
	* Setting listner will remove previous listener (if exists)
	* Only allow set listener during stream configuration because stream is guaranteed to be IDLE
	* at this state, so setBufferFreedListener won't collide with onBufferFreed callbacks.
	* Client is responsible to keep the listener object alive throughout the lifecycle of this
	* Camera3Stream.
	*/
	virtual void setBufferFreedListener(wp<Camera3StreamBufferFreedListener> listener) = 0;

	/**
	* Notify buffer stream listeners about incoming request with particular frame number.
	*/
	virtual void fireBufferRequestForFrameNumber(uint64_t frameNumber,
	const CameraMetadata& settings) = 0;
	};

	} // namespace camera3

	} // namespace android

	#endif