services/camera/libcameraservice/ProCamera2Client.cpp - platform/frameworks/av - Git at Google

 /*
  * 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.
  */

 #define LOG_TAG "ProCamera2Client"
 #define ATRACE_TAG ATRACE_TAG_CAMERA
 //#define LOG_NDEBUG 0

 #include <utils/Log.h>
 #include <utils/Trace.h>

 #include <cutils/properties.h>
 #include <gui/Surface.h>
 #include <gui/Surface.h>
 #include "camera2/Parameters.h"
 #include "ProCamera2Client.h"
 #include "camera2/ProFrameProcessor.h"
 #include "CameraDeviceBase.h"

 namespace android {
 using namespace camera2;

 // Interface used by CameraService

 ProCamera2Client::ProCamera2Client(const sp<CameraService>& cameraService,
                                    const sp<IProCameraCallbacks>& remoteCallback,
                                    const String16& clientPackageName,
                                    int cameraId,
                                    int cameraFacing,
                                    int clientPid,
                                    uid_t clientUid,
                                    int servicePid) :
     Camera2ClientBase(cameraService, remoteCallback, clientPackageName,
                 cameraId, cameraFacing, clientPid, clientUid, servicePid)
 {
     ATRACE_CALL();
     ALOGI("ProCamera %d: Opened", cameraId);

     mExclusiveLock = false;
 }

 status_t ProCamera2Client::initialize(camera_module_t *module)
 {
     ATRACE_CALL();
     status_t res;

     res = Camera2ClientBase::initialize(module);
     if (res != OK) {
         return res;
     }

     String8 threadName;
     mFrameProcessor = new ProFrameProcessor(mDevice);
     threadName = String8::format("PC2-%d-FrameProc", mCameraId);
     mFrameProcessor->run(threadName.string());

     mFrameProcessor->registerListener(FRAME_PROCESSOR_LISTENER_MIN_ID,
                                       FRAME_PROCESSOR_LISTENER_MAX_ID,
                                       /*listener*/this);

     return OK;
 }

 ProCamera2Client::~ProCamera2Client() {
 }

 status_t ProCamera2Client::exclusiveTryLock() {
     ATRACE_CALL();
     ALOGV("%s", __FUNCTION__);

     Mutex::Autolock icl(mBinderSerializationLock);
     SharedCameraCallbacks::Lock l(mSharedCameraCallbacks);

     if (!mDevice.get()) return PERMISSION_DENIED;

     if (!mExclusiveLock) {
         mExclusiveLock = true;

         if (mRemoteCallback != NULL) {
             mRemoteCallback->onLockStatusChanged(
                               IProCameraCallbacks::LOCK_ACQUIRED);
         }

         ALOGV("%s: exclusive lock acquired", __FUNCTION__);

         return OK;
     }

     // TODO: have a PERMISSION_DENIED case for when someone else owns the lock

     // don't allow recursive locking
     ALOGW("%s: exclusive lock already exists - recursive locking is not"
           "allowed", __FUNCTION__);

     return ALREADY_EXISTS;
 }

 status_t ProCamera2Client::exclusiveLock() {
     ATRACE_CALL();
     ALOGV("%s", __FUNCTION__);

     Mutex::Autolock icl(mBinderSerializationLock);
     SharedCameraCallbacks::Lock l(mSharedCameraCallbacks);

     if (!mDevice.get()) return PERMISSION_DENIED;

     /**
      * TODO: this should asynchronously 'wait' until the lock becomes available
      * if another client already has an exclusive lock.
      *
      * once we have proper sharing support this will need to do
      * more than just return immediately
      */
     if (!mExclusiveLock) {
         mExclusiveLock = true;

         if (mRemoteCallback != NULL) {
             mRemoteCallback->onLockStatusChanged(IProCameraCallbacks::LOCK_ACQUIRED);
         }

         ALOGV("%s: exclusive lock acquired", __FUNCTION__);

         return OK;
     }

     // don't allow recursive locking
     ALOGW("%s: exclusive lock already exists - recursive locking is not allowed"
                                                                 , __FUNCTION__);
     return ALREADY_EXISTS;
 }

 status_t ProCamera2Client::exclusiveUnlock() {
     ATRACE_CALL();
     ALOGV("%s", __FUNCTION__);

     Mutex::Autolock icl(mBinderSerializationLock);
     SharedCameraCallbacks::Lock l(mSharedCameraCallbacks);

     // don't allow unlocking if we have no lock
     if (!mExclusiveLock) {
         ALOGW("%s: cannot unlock, no lock was held in the first place",
               __FUNCTION__);
         return BAD_VALUE;
     }

     mExclusiveLock = false;
     if (mRemoteCallback != NULL ) {
         mRemoteCallback->onLockStatusChanged(
                                        IProCameraCallbacks::LOCK_RELEASED);
     }
     ALOGV("%s: exclusive lock released", __FUNCTION__);

     return OK;
 }

 bool ProCamera2Client::hasExclusiveLock() {
     Mutex::Autolock icl(mBinderSerializationLock);
     return mExclusiveLock;
 }

 void ProCamera2Client::onExclusiveLockStolen() {
     ALOGV("%s: ProClient lost exclusivity (id %d)",
           __FUNCTION__, mCameraId);

     Mutex::Autolock icl(mBinderSerializationLock);
     SharedCameraCallbacks::Lock l(mSharedCameraCallbacks);

     if (mExclusiveLock && mRemoteCallback.get() != NULL) {
         mRemoteCallback->onLockStatusChanged(
                                        IProCameraCallbacks::LOCK_STOLEN);
     }

     mExclusiveLock = false;

     //TODO: we should not need to detach the device, merely reset it.
     detachDevice();
 }

 status_t ProCamera2Client::submitRequest(camera_metadata_t* request,
                                          bool streaming) {
     ATRACE_CALL();
     ALOGV("%s", __FUNCTION__);

     Mutex::Autolock icl(mBinderSerializationLock);

     if (!mDevice.get()) return DEAD_OBJECT;

     if (!mExclusiveLock) {
         return PERMISSION_DENIED;
     }

     CameraMetadata metadata(request);

     if (!enforceRequestPermissions(metadata)) {
         return PERMISSION_DENIED;
     }

     if (streaming) {
         return mDevice->setStreamingRequest(metadata);
     } else {
         return mDevice->capture(metadata);
     }

     // unreachable. thx gcc for a useless warning
     return OK;
 }

 status_t ProCamera2Client::cancelRequest(int requestId) {
     ATRACE_CALL();
     ALOGV("%s", __FUNCTION__);

     Mutex::Autolock icl(mBinderSerializationLock);

     if (!mDevice.get()) return DEAD_OBJECT;

     if (!mExclusiveLock) {
         return PERMISSION_DENIED;
     }

     // TODO: implement
     ALOGE("%s: not fully implemented yet", __FUNCTION__);
     return INVALID_OPERATION;
 }

 status_t ProCamera2Client::deleteStream(int streamId) {
     ATRACE_CALL();
     ALOGV("%s (streamId = 0x%x)", __FUNCTION__, streamId);

     status_t res;
     if ( (res = checkPid(__FUNCTION__) ) != OK) return res;

     Mutex::Autolock icl(mBinderSerializationLock);

     if (!mDevice.get()) return DEAD_OBJECT;
     mDevice->clearStreamingRequest();

     status_t code;
     if ((code = mDevice->waitUntilDrained()) != OK) {
         ALOGE("%s: waitUntilDrained failed with code 0x%x", __FUNCTION__, code);
     }

     return mDevice->deleteStream(streamId);
 }

 status_t ProCamera2Client::createStream(int width, int height, int format,
                       const sp<IGraphicBufferProducer>& bufferProducer,
                       /*out*/
                       int* streamId)
 {
     if (streamId) {
         *streamId = -1;
     }

     ATRACE_CALL();
     ALOGV("%s (w = %d, h = %d, f = 0x%x)", __FUNCTION__, width, height, format);

     status_t res;
     if ( (res = checkPid(__FUNCTION__) ) != OK) return res;

     Mutex::Autolock icl(mBinderSerializationLock);

     if (!mDevice.get()) return DEAD_OBJECT;

     sp<IBinder> binder;
     sp<ANativeWindow> window;
     if (bufferProducer != 0) {
         binder = bufferProducer->asBinder();
         window = new Surface(bufferProducer);
     }

     return mDevice->createStream(window, width, height, format, /*size*/1,
                                  streamId);
 }

 // Create a request object from a template.
 // -- Caller owns the newly allocated metadata
 status_t ProCamera2Client::createDefaultRequest(int templateId,
                              /*out*/
                               camera_metadata** request)
 {
     ATRACE_CALL();
     ALOGV("%s (templateId = 0x%x)", __FUNCTION__, templateId);

     if (request) {
         *request = NULL;
     }

     status_t res;
     if ( (res = checkPid(__FUNCTION__) ) != OK) return res;

     Mutex::Autolock icl(mBinderSerializationLock);

     if (!mDevice.get()) return DEAD_OBJECT;

     CameraMetadata metadata;
     if ( (res = mDevice->createDefaultRequest(templateId, &metadata) ) == OK) {
         *request = metadata.release();
     }

     return res;
 }

 status_t ProCamera2Client::getCameraInfo(int cameraId,
                                          /*out*/
                                          camera_metadata** info)
 {
     if (cameraId != mCameraId) {
         return INVALID_OPERATION;
     }

     Mutex::Autolock icl(mBinderSerializationLock);

     if (!mDevice.get()) return DEAD_OBJECT;

     CameraMetadata deviceInfo = mDevice->info();
     *info = deviceInfo.release();

     return OK;
 }

 status_t ProCamera2Client::dump(int fd, const Vector<String16>& args) {
     String8 result;
     result.appendFormat("ProCamera2Client[%d] (%p) PID: %d, dump:\n",
             mCameraId,
             getRemoteCallback()->asBinder().get(),
             mClientPid);
     result.append("  State: ");

     // TODO: print dynamic/request section from most recent requests
     mFrameProcessor->dump(fd, args);

     return dumpDevice(fd, args);
 }

 // IProCameraUser interface

 void ProCamera2Client::detachDevice() {
     if (mDevice == 0) return;

     ALOGV("Camera %d: Stopping processors", mCameraId);

     mFrameProcessor->removeListener(FRAME_PROCESSOR_LISTENER_MIN_ID,
                                     FRAME_PROCESSOR_LISTENER_MAX_ID,
                                     /*listener*/this);
     mFrameProcessor->requestExit();
     ALOGV("Camera %d: Waiting for threads", mCameraId);
     mFrameProcessor->join();
     ALOGV("Camera %d: Disconnecting device", mCameraId);

     // WORKAROUND: HAL refuses to disconnect while there's streams in flight
     {
         mDevice->clearStreamingRequest();

         status_t code;
         if ((code = mDevice->waitUntilDrained()) != OK) {
             ALOGE("%s: waitUntilDrained failed with code 0x%x", __FUNCTION__,
                   code);
         }
     }

     Camera2ClientBase::detachDevice();
 }

 /** Device-related methods */
 void ProCamera2Client::onFrameAvailable(int32_t frameId,
                                         const CameraMetadata& frame) {
     ATRACE_CALL();
     ALOGV("%s", __FUNCTION__);

     Mutex::Autolock icl(mBinderSerializationLock);
     SharedCameraCallbacks::Lock l(mSharedCameraCallbacks);

     if (mRemoteCallback != NULL) {
         CameraMetadata tmp(frame);
         camera_metadata_t* meta = tmp.release();
         ALOGV("%s: meta = %p ", __FUNCTION__, meta);
         mRemoteCallback->onResultReceived(frameId, meta);
         tmp.acquire(meta);
     }

 }

 bool ProCamera2Client::enforceRequestPermissions(CameraMetadata& metadata) {

     const int pid = IPCThreadState::self()->getCallingPid();
     const int selfPid = getpid();
     camera_metadata_entry_t entry;

     /**
      * Mixin default important security values
      * - android.led.transmit = defaulted ON
      */
     CameraMetadata staticInfo = mDevice->info();
     entry = staticInfo.find(ANDROID_LED_AVAILABLE_LEDS);
     for(size_t i = 0; i < entry.count; ++i) {
         uint8_t led = entry.data.u8[i];

         switch(led) {
             case ANDROID_LED_AVAILABLE_LEDS_TRANSMIT: {
                 uint8_t transmitDefault = ANDROID_LED_TRANSMIT_ON;
                 if (!metadata.exists(ANDROID_LED_TRANSMIT)) {
                     metadata.update(ANDROID_LED_TRANSMIT,
                                     &transmitDefault, 1);
                 }
                 break;
             }
         }
     }

     // We can do anything!
     if (pid == selfPid) {
         return true;
     }

     /**
      * Permission check special fields in the request
      * - android.led.transmit = android.permission.CAMERA_DISABLE_TRANSMIT
      */
     entry = metadata.find(ANDROID_LED_TRANSMIT);
     if (entry.count > 0 && entry.data.u8[0] != ANDROID_LED_TRANSMIT_ON) {
         String16 permissionString =
             String16("android.permission.CAMERA_DISABLE_TRANSMIT_LED");
         if (!checkCallingPermission(permissionString)) {
             const int uid = IPCThreadState::self()->getCallingUid();
             ALOGE("Permission Denial: "
                   "can't disable transmit LED pid=%d, uid=%d", pid, uid);
             return false;
         }
     }

     return true;
 }

 } // namespace android
	/*
	* 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.
	*/

	#define LOG_TAG "ProCamera2Client"
	#define ATRACE_TAG ATRACE_TAG_CAMERA
	//#define LOG_NDEBUG 0

	#include <utils/Log.h>
	#include <utils/Trace.h>

	#include <cutils/properties.h>
	#include <gui/Surface.h>
	#include <gui/Surface.h>
	#include "camera2/Parameters.h"
	#include "ProCamera2Client.h"
	#include "camera2/ProFrameProcessor.h"
	#include "CameraDeviceBase.h"

	namespace android {
	using namespace camera2;

	// Interface used by CameraService

	ProCamera2Client::ProCamera2Client(const sp<CameraService>& cameraService,
	const sp<IProCameraCallbacks>& remoteCallback,
	const String16& clientPackageName,
	int cameraId,
	int cameraFacing,
	int clientPid,
	uid_t clientUid,
	int servicePid) :
	Camera2ClientBase(cameraService, remoteCallback, clientPackageName,
	cameraId, cameraFacing, clientPid, clientUid, servicePid)
	{
	ATRACE_CALL();
	ALOGI("ProCamera %d: Opened", cameraId);

	mExclusiveLock = false;
	}

	status_t ProCamera2Client::initialize(camera_module_t *module)
	{
	ATRACE_CALL();
	status_t res;

	res = Camera2ClientBase::initialize(module);
	if (res != OK) {
	return res;
	}

	String8 threadName;
	mFrameProcessor = new ProFrameProcessor(mDevice);
	threadName = String8::format("PC2-%d-FrameProc", mCameraId);
	mFrameProcessor->run(threadName.string());

	mFrameProcessor->registerListener(FRAME_PROCESSOR_LISTENER_MIN_ID,
	FRAME_PROCESSOR_LISTENER_MAX_ID,
	/listener/this);

	return OK;
	}

	ProCamera2Client::~ProCamera2Client() {
	}

	status_t ProCamera2Client::exclusiveTryLock() {
	ATRACE_CALL();
	ALOGV("%s", __FUNCTION__);

	Mutex::Autolock icl(mBinderSerializationLock);
	SharedCameraCallbacks::Lock l(mSharedCameraCallbacks);

	if (!mDevice.get()) return PERMISSION_DENIED;

	if (!mExclusiveLock) {
	mExclusiveLock = true;

	if (mRemoteCallback != NULL) {
	mRemoteCallback->onLockStatusChanged(
	IProCameraCallbacks::LOCK_ACQUIRED);
	}

	ALOGV("%s: exclusive lock acquired", __FUNCTION__);

	return OK;
	}

	// TODO: have a PERMISSION_DENIED case for when someone else owns the lock

	// don't allow recursive locking
	ALOGW("%s: exclusive lock already exists - recursive locking is not"
	"allowed", __FUNCTION__);

	return ALREADY_EXISTS;
	}

	status_t ProCamera2Client::exclusiveLock() {
	ATRACE_CALL();
	ALOGV("%s", __FUNCTION__);

	Mutex::Autolock icl(mBinderSerializationLock);
	SharedCameraCallbacks::Lock l(mSharedCameraCallbacks);

	if (!mDevice.get()) return PERMISSION_DENIED;

	/**
	* TODO: this should asynchronously 'wait' until the lock becomes available
	* if another client already has an exclusive lock.
	*
	* once we have proper sharing support this will need to do
	* more than just return immediately
	*/
	if (!mExclusiveLock) {
	mExclusiveLock = true;

	if (mRemoteCallback != NULL) {
	mRemoteCallback->onLockStatusChanged(IProCameraCallbacks::LOCK_ACQUIRED);
	}

	ALOGV("%s: exclusive lock acquired", __FUNCTION__);

	return OK;
	}

	// don't allow recursive locking
	ALOGW("%s: exclusive lock already exists - recursive locking is not allowed"
	, __FUNCTION__);
	return ALREADY_EXISTS;
	}

	status_t ProCamera2Client::exclusiveUnlock() {
	ATRACE_CALL();
	ALOGV("%s", __FUNCTION__);

	Mutex::Autolock icl(mBinderSerializationLock);
	SharedCameraCallbacks::Lock l(mSharedCameraCallbacks);

	// don't allow unlocking if we have no lock
	if (!mExclusiveLock) {
	ALOGW("%s: cannot unlock, no lock was held in the first place",
	__FUNCTION__);
	return BAD_VALUE;
	}

	mExclusiveLock = false;
	if (mRemoteCallback != NULL ) {
	mRemoteCallback->onLockStatusChanged(
	IProCameraCallbacks::LOCK_RELEASED);
	}
	ALOGV("%s: exclusive lock released", __FUNCTION__);

	return OK;
	}

	bool ProCamera2Client::hasExclusiveLock() {
	Mutex::Autolock icl(mBinderSerializationLock);
	return mExclusiveLock;
	}

	void ProCamera2Client::onExclusiveLockStolen() {
	ALOGV("%s: ProClient lost exclusivity (id %d)",
	__FUNCTION__, mCameraId);

	Mutex::Autolock icl(mBinderSerializationLock);
	SharedCameraCallbacks::Lock l(mSharedCameraCallbacks);

	if (mExclusiveLock && mRemoteCallback.get() != NULL) {
	mRemoteCallback->onLockStatusChanged(
	IProCameraCallbacks::LOCK_STOLEN);
	}

	mExclusiveLock = false;

	//TODO: we should not need to detach the device, merely reset it.
	detachDevice();
	}

	status_t ProCamera2Client::submitRequest(camera_metadata_t* request,
	bool streaming) {
	ATRACE_CALL();
	ALOGV("%s", __FUNCTION__);

	Mutex::Autolock icl(mBinderSerializationLock);

	if (!mDevice.get()) return DEAD_OBJECT;

	if (!mExclusiveLock) {
	return PERMISSION_DENIED;
	}

	CameraMetadata metadata(request);

	if (!enforceRequestPermissions(metadata)) {
	return PERMISSION_DENIED;
	}

	if (streaming) {
	return mDevice->setStreamingRequest(metadata);
	} else {
	return mDevice->capture(metadata);
	}

	// unreachable. thx gcc for a useless warning
	return OK;
	}

	status_t ProCamera2Client::cancelRequest(int requestId) {
	ATRACE_CALL();
	ALOGV("%s", __FUNCTION__);

	Mutex::Autolock icl(mBinderSerializationLock);

	if (!mDevice.get()) return DEAD_OBJECT;

	if (!mExclusiveLock) {
	return PERMISSION_DENIED;
	}

	// TODO: implement
	ALOGE("%s: not fully implemented yet", __FUNCTION__);
	return INVALID_OPERATION;
	}

	status_t ProCamera2Client::deleteStream(int streamId) {
	ATRACE_CALL();
	ALOGV("%s (streamId = 0x%x)", __FUNCTION__, streamId);

	status_t res;
	if ( (res = checkPid(__FUNCTION__) ) != OK) return res;

	Mutex::Autolock icl(mBinderSerializationLock);

	if (!mDevice.get()) return DEAD_OBJECT;
	mDevice->clearStreamingRequest();

	status_t code;
	if ((code = mDevice->waitUntilDrained()) != OK) {
	ALOGE("%s: waitUntilDrained failed with code 0x%x", __FUNCTION__, code);
	}

	return mDevice->deleteStream(streamId);
	}

	status_t ProCamera2Client::createStream(int width, int height, int format,
	const sp<IGraphicBufferProducer>& bufferProducer,
	/out/
	int* streamId)
	{
	if (streamId) {
	*streamId = -1;
	}

	ATRACE_CALL();
	ALOGV("%s (w = %d, h = %d, f = 0x%x)", __FUNCTION__, width, height, format);

	status_t res;
	if ( (res = checkPid(__FUNCTION__) ) != OK) return res;

	Mutex::Autolock icl(mBinderSerializationLock);

	if (!mDevice.get()) return DEAD_OBJECT;

	sp<IBinder> binder;
	sp<ANativeWindow> window;
	if (bufferProducer != 0) {
	binder = bufferProducer->asBinder();
	window = new Surface(bufferProducer);
	}

	return mDevice->createStream(window, width, height, format, /size/1,
	streamId);
	}

	// Create a request object from a template.
	// -- Caller owns the newly allocated metadata
	status_t ProCamera2Client::createDefaultRequest(int templateId,
	/out/
	camera_metadata** request)
	{
	ATRACE_CALL();
	ALOGV("%s (templateId = 0x%x)", __FUNCTION__, templateId);

	if (request) {
	*request = NULL;
	}

	status_t res;
	if ( (res = checkPid(__FUNCTION__) ) != OK) return res;

	Mutex::Autolock icl(mBinderSerializationLock);

	if (!mDevice.get()) return DEAD_OBJECT;

	CameraMetadata metadata;
	if ( (res = mDevice->createDefaultRequest(templateId, &metadata) ) == OK) {
	*request = metadata.release();
	}

	return res;
	}

	status_t ProCamera2Client::getCameraInfo(int cameraId,
	/out/
	camera_metadata** info)
	{
	if (cameraId != mCameraId) {
	return INVALID_OPERATION;
	}

	Mutex::Autolock icl(mBinderSerializationLock);

	if (!mDevice.get()) return DEAD_OBJECT;

	CameraMetadata deviceInfo = mDevice->info();
	*info = deviceInfo.release();

	return OK;
	}

	status_t ProCamera2Client::dump(int fd, const Vector<String16>& args) {
	String8 result;
	result.appendFormat("ProCamera2Client[%d] (%p) PID: %d, dump:\n",
	mCameraId,
	getRemoteCallback()->asBinder().get(),
	mClientPid);
	result.append(" State: ");

	// TODO: print dynamic/request section from most recent requests
	mFrameProcessor->dump(fd, args);

	return dumpDevice(fd, args);
	}

	// IProCameraUser interface

	void ProCamera2Client::detachDevice() {
	if (mDevice == 0) return;

	ALOGV("Camera %d: Stopping processors", mCameraId);

	mFrameProcessor->removeListener(FRAME_PROCESSOR_LISTENER_MIN_ID,
	FRAME_PROCESSOR_LISTENER_MAX_ID,
	/listener/this);
	mFrameProcessor->requestExit();
	ALOGV("Camera %d: Waiting for threads", mCameraId);
	mFrameProcessor->join();
	ALOGV("Camera %d: Disconnecting device", mCameraId);

	// WORKAROUND: HAL refuses to disconnect while there's streams in flight
	{
	mDevice->clearStreamingRequest();

	status_t code;
	if ((code = mDevice->waitUntilDrained()) != OK) {
	ALOGE("%s: waitUntilDrained failed with code 0x%x", __FUNCTION__,
	code);
	}
	}

	Camera2ClientBase::detachDevice();
	}

	/** Device-related methods */
	void ProCamera2Client::onFrameAvailable(int32_t frameId,
	const CameraMetadata& frame) {
	ATRACE_CALL();
	ALOGV("%s", __FUNCTION__);

	Mutex::Autolock icl(mBinderSerializationLock);
	SharedCameraCallbacks::Lock l(mSharedCameraCallbacks);

	if (mRemoteCallback != NULL) {
	CameraMetadata tmp(frame);
	camera_metadata_t* meta = tmp.release();
	ALOGV("%s: meta = %p ", __FUNCTION__, meta);
	mRemoteCallback->onResultReceived(frameId, meta);
	tmp.acquire(meta);
	}

	}

	bool ProCamera2Client::enforceRequestPermissions(CameraMetadata& metadata) {

	const int pid = IPCThreadState::self()->getCallingPid();
	const int selfPid = getpid();
	camera_metadata_entry_t entry;

	/**
	* Mixin default important security values
	* - android.led.transmit = defaulted ON
	*/
	CameraMetadata staticInfo = mDevice->info();
	entry = staticInfo.find(ANDROID_LED_AVAILABLE_LEDS);
	for(size_t i = 0; i < entry.count; ++i) {
	uint8_t led = entry.data.u8[i];

	switch(led) {
	case ANDROID_LED_AVAILABLE_LEDS_TRANSMIT: {
	uint8_t transmitDefault = ANDROID_LED_TRANSMIT_ON;
	if (!metadata.exists(ANDROID_LED_TRANSMIT)) {
	metadata.update(ANDROID_LED_TRANSMIT,
	&transmitDefault, 1);
	}
	break;
	}
	}
	}

	// We can do anything!
	if (pid == selfPid) {
	return true;
	}

	/**
	* Permission check special fields in the request
	* - android.led.transmit = android.permission.CAMERA_DISABLE_TRANSMIT
	*/
	entry = metadata.find(ANDROID_LED_TRANSMIT);
	if (entry.count > 0 && entry.data.u8[0] != ANDROID_LED_TRANSMIT_ON) {
	String16 permissionString =
	String16("android.permission.CAMERA_DISABLE_TRANSMIT_LED");
	if (!checkCallingPermission(permissionString)) {
	const int uid = IPCThreadState::self()->getCallingUid();
	ALOGE("Permission Denial: "
	"can't disable transmit LED pid=%d, uid=%d", pid, uid);
	return false;
	}
	}

	return true;
	}

	} // namespace android