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/*
**
** 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_NDEBUG 0
#define LOG_TAG "CameraBase"
#include <utils/Log.h>
#include <utils/threads.h>
#include <utils/Mutex.h>
#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
#include <binder/IMemory.h>
#include <camera/CameraBase.h>
#include <camera/ICameraService.h>
// needed to instantiate
#include <camera/ProCamera.h>
#include <camera/Camera.h>
#include <system/camera_metadata.h>
namespace android {
namespace {
sp<ICameraService> gCameraService;
const int kCameraServicePollDelay = 500000; // 0.5s
const char* kCameraServiceName = "media.camera";
Mutex gLock;
class DeathNotifier : public IBinder::DeathRecipient
{
public:
DeathNotifier() {
}
virtual void binderDied(const wp<IBinder>& /*who*/) {
ALOGV("binderDied");
Mutex::Autolock _l(gLock);
gCameraService.clear();
ALOGW("Camera service died!");
}
};
sp<DeathNotifier> gDeathNotifier;
}; // namespace anonymous
///////////////////////////////////////////////////////////
// CameraBase definition
///////////////////////////////////////////////////////////
// establish binder interface to camera service
template <typename TCam, typename TCamTraits>
const sp<ICameraService>& CameraBase<TCam, TCamTraits>::getCameraService()
{
Mutex::Autolock _l(gLock);
if (gCameraService.get() == 0) {
sp<IServiceManager> sm = defaultServiceManager();
sp<IBinder> binder;
do {
binder = sm->getService(String16(kCameraServiceName));
if (binder != 0) {
break;
}
ALOGW("CameraService not published, waiting...");
usleep(kCameraServicePollDelay);
} while(true);
if (gDeathNotifier == NULL) {
gDeathNotifier = new DeathNotifier();
}
binder->linkToDeath(gDeathNotifier);
gCameraService = interface_cast<ICameraService>(binder);
}
ALOGE_IF(gCameraService == 0, "no CameraService!?");
return gCameraService;
}
template <typename TCam, typename TCamTraits>
sp<TCam> CameraBase<TCam, TCamTraits>::connect(int cameraId,
const String16& clientPackageName,
int clientUid)
{
ALOGV("%s: connect", __FUNCTION__);
sp<TCam> c = new TCam(cameraId);
sp<TCamCallbacks> cl = c;
status_t status = NO_ERROR;
const sp<ICameraService>& cs = getCameraService();
if (cs != 0) {
TCamConnectService fnConnectService = TCamTraits::fnConnectService;
status = (cs.get()->*fnConnectService)(cl, cameraId, clientPackageName, clientUid,
/*out*/ c->mCamera);
}
if (status == OK && c->mCamera != 0) {
c->mCamera->asBinder()->linkToDeath(c);
c->mStatus = NO_ERROR;
} else {
ALOGW("An error occurred while connecting to camera: %d", cameraId);
c.clear();
}
return c;
}
template <typename TCam, typename TCamTraits>
void CameraBase<TCam, TCamTraits>::disconnect()
{
ALOGV("%s: disconnect", __FUNCTION__);
if (mCamera != 0) {
mCamera->disconnect();
mCamera->asBinder()->unlinkToDeath(this);
mCamera = 0;
}
ALOGV("%s: disconnect (done)", __FUNCTION__);
}
template <typename TCam, typename TCamTraits>
CameraBase<TCam, TCamTraits>::CameraBase(int cameraId) :
mStatus(UNKNOWN_ERROR),
mCameraId(cameraId)
{
}
template <typename TCam, typename TCamTraits>
CameraBase<TCam, TCamTraits>::~CameraBase()
{
}
template <typename TCam, typename TCamTraits>
sp<typename TCamTraits::TCamUser> CameraBase<TCam, TCamTraits>::remote()
{
return mCamera;
}
template <typename TCam, typename TCamTraits>
status_t CameraBase<TCam, TCamTraits>::getStatus()
{
return mStatus;
}
template <typename TCam, typename TCamTraits>
void CameraBase<TCam, TCamTraits>::binderDied(const wp<IBinder>& /*who*/) {
ALOGW("mediaserver's remote binder Camera object died");
notifyCallback(CAMERA_MSG_ERROR, CAMERA_ERROR_SERVER_DIED, /*ext2*/0);
}
template <typename TCam, typename TCamTraits>
void CameraBase<TCam, TCamTraits>::setListener(const sp<TCamListener>& listener)
{
Mutex::Autolock _l(mLock);
mListener = listener;
}
// callback from camera service
template <typename TCam, typename TCamTraits>
void CameraBase<TCam, TCamTraits>::notifyCallback(int32_t msgType,
int32_t ext1,
int32_t ext2)
{
sp<TCamListener> listener;
{
Mutex::Autolock _l(mLock);
listener = mListener;
}
if (listener != NULL) {
listener->notify(msgType, ext1, ext2);
}
}
template <typename TCam, typename TCamTraits>
int CameraBase<TCam, TCamTraits>::getNumberOfCameras() {
const sp<ICameraService> cs = getCameraService();
if (!cs.get()) {
// as required by the public Java APIs
return 0;
}
return cs->getNumberOfCameras();
}
// this can be in BaseCamera but it should be an instance method
template <typename TCam, typename TCamTraits>
status_t CameraBase<TCam, TCamTraits>::getCameraInfo(int cameraId,
struct CameraInfo* cameraInfo) {
const sp<ICameraService>& cs = getCameraService();
if (cs == 0) return UNKNOWN_ERROR;
return cs->getCameraInfo(cameraId, cameraInfo);
}
template <typename TCam, typename TCamTraits>
status_t CameraBase<TCam, TCamTraits>::addServiceListener(
const sp<ICameraServiceListener>& listener) {
const sp<ICameraService>& cs = getCameraService();
if (cs == 0) return UNKNOWN_ERROR;
return cs->addListener(listener);
}
template <typename TCam, typename TCamTraits>
status_t CameraBase<TCam, TCamTraits>::removeServiceListener(
const sp<ICameraServiceListener>& listener) {
const sp<ICameraService>& cs = getCameraService();
if (cs == 0) return UNKNOWN_ERROR;
return cs->removeListener(listener);
}
template class CameraBase<ProCamera>;
template class CameraBase<Camera>;
} // namespace android
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