camera/Camera.cpp

/*
**
** Copyright (C) 2008, 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 "Camera"
#include <utils/Log.h>
#include <utils/threads.h>
#include <utils/String16.h>
#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
#include <binder/IMemory.h>

#include <camera/Camera.h>
#include <camera/ICameraRecordingProxyListener.h>
#include <camera/ICameraService.h>
#include <camera/ICamera.h>

#include <gui/IGraphicBufferProducer.h>
#include <gui/Surface.h>

namespace android {

Camera::Camera(int cameraId)
    : CameraBase(cameraId)
{
}

CameraTraits<Camera>::TCamConnectService CameraTraits<Camera>::fnConnectService =
        &ICameraService::connect;

// construct a camera client from an existing camera remote
sp<Camera> Camera::create(const sp<ICamera>& camera)
{
     ALOGV("create");
     if (camera == 0) {
         ALOGE("camera remote is a NULL pointer");
         return 0;
     }

    sp<Camera> c = new Camera(-1);
    if (camera->connect(c) == NO_ERROR) {
        c->mStatus = NO_ERROR;
        c->mCamera = camera;
        camera->asBinder()->linkToDeath(c);
        return c;
    }
    return 0;
}

Camera::~Camera()
{
    // We don't need to call disconnect() here because if the CameraService
    // thinks we are the owner of the hardware, it will hold a (strong)
    // reference to us, and we can't possibly be here. We also don't want to
    // call disconnect() here if we are in the same process as mediaserver,
    // because we may be invoked by CameraService::Client::connect() and will
    // deadlock if we call any method of ICamera here.
}

sp<Camera> Camera::connect(int cameraId, const String16& clientPackageName,
        int clientUid)
{
    return CameraBaseT::connect(cameraId, clientPackageName, clientUid);
}

status_t Camera::connectLegacy(int cameraId, int halVersion,
        const String16& clientPackageName,
        int clientUid,
        sp<Camera>& camera)
{
    ALOGV("%s: connect legacy camera device", __FUNCTION__);
    sp<Camera> c = new Camera(cameraId);
    sp<ICameraClient> cl = c;
    status_t status = NO_ERROR;
    const sp<ICameraService>& cs = CameraBaseT::getCameraService();

    if (cs != 0) {
        status = cs.get()->connectLegacy(cl, cameraId, halVersion, clientPackageName,
                                        clientUid, /*out*/c->mCamera);
    }
    if (status == OK && c->mCamera != 0) {
        c->mCamera->asBinder()->linkToDeath(c);
        c->mStatus = NO_ERROR;
        camera = c;
    } else {
        ALOGW("An error occurred while connecting to camera: %d", cameraId);
        c.clear();
    }
    return status;
}

status_t Camera::reconnect()
{
    ALOGV("reconnect");
    sp <ICamera> c = mCamera;
    if (c == 0) return NO_INIT;
    return c->connect(this);
}

status_t Camera::lock()
{
    sp <ICamera> c = mCamera;
    if (c == 0) return NO_INIT;
    return c->lock();
}

status_t Camera::unlock()
{
    sp <ICamera> c = mCamera;
    if (c == 0) return NO_INIT;
    return c->unlock();
}

// pass the buffered IGraphicBufferProducer to the camera service
status_t Camera::setPreviewTarget(const sp<IGraphicBufferProducer>& bufferProducer)
{
    ALOGV("setPreviewTarget(%p)", bufferProducer.get());
    sp <ICamera> c = mCamera;
    if (c == 0) return NO_INIT;
    ALOGD_IF(bufferProducer == 0, "app passed NULL surface");
    return c->setPreviewTarget(bufferProducer);
}

// start preview mode
status_t Camera::startPreview()
{
    ALOGV("startPreview");
    sp <ICamera> c = mCamera;
    if (c == 0) return NO_INIT;
    return c->startPreview();
}

status_t Camera::storeMetaDataInBuffers(bool enabled)
{
    ALOGV("storeMetaDataInBuffers: %s",
            enabled? "true": "false");
    sp <ICamera> c = mCamera;
    if (c == 0) return NO_INIT;
    return c->storeMetaDataInBuffers(enabled);
}

// start recording mode, must call setPreviewTarget first
status_t Camera::startRecording()
{
    ALOGV("startRecording");
    sp <ICamera> c = mCamera;
    if (c == 0) return NO_INIT;
    return c->startRecording();
}

// stop preview mode
void Camera::stopPreview()
{
    ALOGV("stopPreview");
    sp <ICamera> c = mCamera;
    if (c == 0) return;
    c->stopPreview();
}

// stop recording mode
void Camera::stopRecording()
{
    ALOGV("stopRecording");
    {
        Mutex::Autolock _l(mLock);
        mRecordingProxyListener.clear();
    }
    sp <ICamera> c = mCamera;
    if (c == 0) return;
    c->stopRecording();
}

// release a recording frame
void Camera::releaseRecordingFrame(const sp<IMemory>& mem)
{
    ALOGV("releaseRecordingFrame");
    sp <ICamera> c = mCamera;
    if (c == 0) return;
    c->releaseRecordingFrame(mem);
}

// get preview state
bool Camera::previewEnabled()
{
    ALOGV("previewEnabled");
    sp <ICamera> c = mCamera;
    if (c == 0) return false;
    return c->previewEnabled();
}

// get recording state
bool Camera::recordingEnabled()
{
    ALOGV("recordingEnabled");
    sp <ICamera> c = mCamera;
    if (c == 0) return false;
    return c->recordingEnabled();
}

status_t Camera::autoFocus()
{
    ALOGV("autoFocus");
    sp <ICamera> c = mCamera;
    if (c == 0) return NO_INIT;
    return c->autoFocus();
}

status_t Camera::cancelAutoFocus()
{
    ALOGV("cancelAutoFocus");
    sp <ICamera> c = mCamera;
    if (c == 0) return NO_INIT;
    return c->cancelAutoFocus();
}

// take a picture
status_t Camera::takePicture(int msgType)
{
    ALOGV("takePicture: 0x%x", msgType);
    sp <ICamera> c = mCamera;
    if (c == 0) return NO_INIT;
    return c->takePicture(msgType);
}

// set preview/capture parameters - key/value pairs
status_t Camera::setParameters(const String8& params)
{
    ALOGV("setParameters");
    sp <ICamera> c = mCamera;
    if (c == 0) return NO_INIT;
    return c->setParameters(params);
}

// get preview/capture parameters - key/value pairs
String8 Camera::getParameters() const
{
    ALOGV("getParameters");
    String8 params;
    sp <ICamera> c = mCamera;
    if (c != 0) params = mCamera->getParameters();
    return params;
}

// send command to camera driver
status_t Camera::sendCommand(int32_t cmd, int32_t arg1, int32_t arg2)
{
    ALOGV("sendCommand");
    sp <ICamera> c = mCamera;
    if (c == 0) return NO_INIT;
    return c->sendCommand(cmd, arg1, arg2);
}

void Camera::setListener(const sp<CameraListener>& listener)
{
    Mutex::Autolock _l(mLock);
    mListener = listener;
}

void Camera::setRecordingProxyListener(const sp<ICameraRecordingProxyListener>& listener)
{
    Mutex::Autolock _l(mLock);
    mRecordingProxyListener = listener;
}

void Camera::setPreviewCallbackFlags(int flag)
{
    ALOGV("setPreviewCallbackFlags");
    sp <ICamera> c = mCamera;
    if (c == 0) return;
    mCamera->setPreviewCallbackFlag(flag);
}

status_t Camera::setPreviewCallbackTarget(
        const sp<IGraphicBufferProducer>& callbackProducer)
{
    sp <ICamera> c = mCamera;
    if (c == 0) return NO_INIT;
    return c->setPreviewCallbackTarget(callbackProducer);
}

// callback from camera service
void Camera::notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2)
{
    return CameraBaseT::notifyCallback(msgType, ext1, ext2);
}

// callback from camera service when frame or image is ready
void Camera::dataCallback(int32_t msgType, const sp<IMemory>& dataPtr,
                          camera_frame_metadata_t *metadata)
{
    sp<CameraListener> listener;
    {
        Mutex::Autolock _l(mLock);
        listener = mListener;
    }
    if (listener != NULL) {
        listener->postData(msgType, dataPtr, metadata);
    }
}

// callback from camera service when timestamped frame is ready
void Camera::dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr)
{
    // If recording proxy listener is registered, forward the frame and return.
    // The other listener (mListener) is ignored because the receiver needs to
    // call releaseRecordingFrame.
    sp<ICameraRecordingProxyListener> proxylistener;
    {
        Mutex::Autolock _l(mLock);
        proxylistener = mRecordingProxyListener;
    }
    if (proxylistener != NULL) {
        proxylistener->dataCallbackTimestamp(timestamp, msgType, dataPtr);
        return;
    }

    sp<CameraListener> listener;
    {
        Mutex::Autolock _l(mLock);
        listener = mListener;
    }

    if (listener != NULL) {
        listener->postDataTimestamp(timestamp, msgType, dataPtr);
    } else {
        ALOGW("No listener was set. Drop a recording frame.");
        releaseRecordingFrame(dataPtr);
    }
}

sp<ICameraRecordingProxy> Camera::getRecordingProxy() {
    ALOGV("getProxy");
    return new RecordingProxy(this);
}

status_t Camera::RecordingProxy::startRecording(const sp<ICameraRecordingProxyListener>& listener)
{
    ALOGV("RecordingProxy::startRecording");
    mCamera->setRecordingProxyListener(listener);
    mCamera->reconnect();
    return mCamera->startRecording();
}

void Camera::RecordingProxy::stopRecording()
{
    ALOGV("RecordingProxy::stopRecording");
    mCamera->stopRecording();
}

void Camera::RecordingProxy::releaseRecordingFrame(const sp<IMemory>& mem)
{
    ALOGV("RecordingProxy::releaseRecordingFrame");
    mCamera->releaseRecordingFrame(mem);
}

Camera::RecordingProxy::RecordingProxy(const sp<Camera>& camera)
{
    mCamera = camera;
}

}; // namespace android