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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 /*
     18  * Contains implementation of a class EmulatedQemuCameraDevice that encapsulates
     19  * an emulated camera device connected to the host.
     20  */
     21 
     22 #define LOG_NDEBUG 0
     23 #define LOG_TAG "EmulatedCamera_QemuDevice"
     24 #include <cutils/log.h>
     25 #include "EmulatedQemuCamera.h"
     26 #include "EmulatedQemuCameraDevice.h"
     27 
     28 namespace android {
     29 
     30 EmulatedQemuCameraDevice::EmulatedQemuCameraDevice(EmulatedQemuCamera* camera_hal)
     31     : EmulatedCameraDevice(camera_hal),
     32       mQemuClient(),
     33       mPreviewFrame(NULL)
     34 {
     35 }
     36 
     37 EmulatedQemuCameraDevice::~EmulatedQemuCameraDevice()
     38 {
     39     if (mPreviewFrame != NULL) {
     40         delete[] mPreviewFrame;
     41     }
     42 }
     43 
     44 /****************************************************************************
     45  * Public API
     46  ***************************************************************************/
     47 
     48 status_t EmulatedQemuCameraDevice::Initialize(const char* device_name)
     49 {
     50     /* Connect to the service. */
     51     char connect_str[256];
     52     snprintf(connect_str, sizeof(connect_str), "name=%s", device_name);
     53     status_t res = mQemuClient.connectClient(connect_str);
     54     if (res != NO_ERROR) {
     55         return res;
     56     }
     57 
     58     /* Initialize base class. */
     59     res = EmulatedCameraDevice::Initialize();
     60     if (res == NO_ERROR) {
     61         ALOGV("%s: Connected to the emulated camera service '%s'",
     62              __FUNCTION__, device_name);
     63         mDeviceName = device_name;
     64     } else {
     65         mQemuClient.queryDisconnect();
     66     }
     67 
     68     return res;
     69 }
     70 
     71 /****************************************************************************
     72  * Emulated camera device abstract interface implementation.
     73  ***************************************************************************/
     74 
     75 status_t EmulatedQemuCameraDevice::connectDevice()
     76 {
     77     ALOGV("%s", __FUNCTION__);
     78 
     79     Mutex::Autolock locker(&mObjectLock);
     80     if (!isInitialized()) {
     81         ALOGE("%s: Qemu camera device is not initialized.", __FUNCTION__);
     82         return EINVAL;
     83     }
     84     if (isConnected()) {
     85         ALOGW("%s: Qemu camera device '%s' is already connected.",
     86              __FUNCTION__, (const char*)mDeviceName);
     87         return NO_ERROR;
     88     }
     89 
     90     /* Connect to the camera device via emulator. */
     91     const status_t res = mQemuClient.queryConnect();
     92     if (res == NO_ERROR) {
     93         ALOGV("%s: Connected to device '%s'",
     94              __FUNCTION__, (const char*)mDeviceName);
     95         mState = ECDS_CONNECTED;
     96     } else {
     97         ALOGE("%s: Connection to device '%s' failed",
     98              __FUNCTION__, (const char*)mDeviceName);
     99     }
    100 
    101     return res;
    102 }
    103 
    104 status_t EmulatedQemuCameraDevice::disconnectDevice()
    105 {
    106     ALOGV("%s", __FUNCTION__);
    107 
    108     Mutex::Autolock locker(&mObjectLock);
    109     if (!isConnected()) {
    110         ALOGW("%s: Qemu camera device '%s' is already disconnected.",
    111              __FUNCTION__, (const char*)mDeviceName);
    112         return NO_ERROR;
    113     }
    114     if (isStarted()) {
    115         ALOGE("%s: Cannot disconnect from the started device '%s.",
    116              __FUNCTION__, (const char*)mDeviceName);
    117         return EINVAL;
    118     }
    119 
    120     /* Disconnect from the camera device via emulator. */
    121     const status_t res = mQemuClient.queryDisconnect();
    122     if (res == NO_ERROR) {
    123         ALOGV("%s: Disonnected from device '%s'",
    124              __FUNCTION__, (const char*)mDeviceName);
    125         mState = ECDS_INITIALIZED;
    126     } else {
    127         ALOGE("%s: Disconnection from device '%s' failed",
    128              __FUNCTION__, (const char*)mDeviceName);
    129     }
    130 
    131     return res;
    132 }
    133 
    134 status_t EmulatedQemuCameraDevice::startDevice(int width,
    135                                                int height,
    136                                                uint32_t pix_fmt)
    137 {
    138     ALOGV("%s", __FUNCTION__);
    139 
    140     Mutex::Autolock locker(&mObjectLock);
    141     if (!isConnected()) {
    142         ALOGE("%s: Qemu camera device '%s' is not connected.",
    143              __FUNCTION__, (const char*)mDeviceName);
    144         return EINVAL;
    145     }
    146     if (isStarted()) {
    147         ALOGW("%s: Qemu camera device '%s' is already started.",
    148              __FUNCTION__, (const char*)mDeviceName);
    149         return NO_ERROR;
    150     }
    151 
    152     status_t res = EmulatedCameraDevice::commonStartDevice(width, height, pix_fmt);
    153     if (res != NO_ERROR) {
    154         ALOGE("%s: commonStartDevice failed", __FUNCTION__);
    155         return res;
    156     }
    157 
    158     /* Allocate preview frame buffer. */
    159     /* TODO: Watch out for preview format changes! At this point we implement
    160      * RGB32 only.*/
    161     mPreviewFrame = new uint32_t[mTotalPixels];
    162     if (mPreviewFrame == NULL) {
    163         ALOGE("%s: Unable to allocate %d bytes for preview frame",
    164              __FUNCTION__, mTotalPixels);
    165         return ENOMEM;
    166     }
    167 
    168     /* Start the actual camera device. */
    169     res = mQemuClient.queryStart(mPixelFormat, mFrameWidth, mFrameHeight);
    170     if (res == NO_ERROR) {
    171         ALOGV("%s: Qemu camera device '%s' is started for %.4s[%dx%d] frames",
    172              __FUNCTION__, (const char*)mDeviceName,
    173              reinterpret_cast<const char*>(&mPixelFormat),
    174              mFrameWidth, mFrameHeight);
    175         mState = ECDS_STARTED;
    176     } else {
    177         ALOGE("%s: Unable to start device '%s' for %.4s[%dx%d] frames",
    178              __FUNCTION__, (const char*)mDeviceName,
    179              reinterpret_cast<const char*>(&pix_fmt), width, height);
    180     }
    181 
    182     return res;
    183 }
    184 
    185 status_t EmulatedQemuCameraDevice::stopDevice()
    186 {
    187     ALOGV("%s", __FUNCTION__);
    188 
    189     Mutex::Autolock locker(&mObjectLock);
    190     if (!isStarted()) {
    191         ALOGW("%s: Qemu camera device '%s' is not started.",
    192              __FUNCTION__, (const char*)mDeviceName);
    193         return NO_ERROR;
    194     }
    195 
    196     /* Stop the actual camera device. */
    197     status_t res = mQemuClient.queryStop();
    198     if (res == NO_ERROR) {
    199         if (mPreviewFrame == NULL) {
    200             delete[] mPreviewFrame;
    201             mPreviewFrame = NULL;
    202         }
    203         EmulatedCameraDevice::commonStopDevice();
    204         mState = ECDS_CONNECTED;
    205         ALOGV("%s: Qemu camera device '%s' is stopped",
    206              __FUNCTION__, (const char*)mDeviceName);
    207     } else {
    208         ALOGE("%s: Unable to stop device '%s'",
    209              __FUNCTION__, (const char*)mDeviceName);
    210     }
    211 
    212     return res;
    213 }
    214 
    215 /****************************************************************************
    216  * EmulatedCameraDevice virtual overrides
    217  ***************************************************************************/
    218 
    219 status_t EmulatedQemuCameraDevice::getCurrentPreviewFrame(void* buffer)
    220 {
    221     ALOGW_IF(mPreviewFrame == NULL, "%s: No preview frame", __FUNCTION__);
    222     if (mPreviewFrame != NULL) {
    223         memcpy(buffer, mPreviewFrame, mTotalPixels * 4);
    224         return 0;
    225     } else {
    226         return EmulatedCameraDevice::getCurrentPreviewFrame(buffer);
    227     }
    228 }
    229 
    230 /****************************************************************************
    231  * Worker thread management overrides.
    232  ***************************************************************************/
    233 
    234 bool EmulatedQemuCameraDevice::inWorkerThread()
    235 {
    236     /* Wait till FPS timeout expires, or thread exit message is received. */
    237     WorkerThread::SelectRes res =
    238         getWorkerThread()->Select(-1, 1000000 / mEmulatedFPS);
    239     if (res == WorkerThread::EXIT_THREAD) {
    240         ALOGV("%s: Worker thread has been terminated.", __FUNCTION__);
    241         return false;
    242     }
    243 
    244     /* Query frames from the service. */
    245     status_t query_res = mQemuClient.queryFrame(mCurrentFrame, mPreviewFrame,
    246                                                  mFrameBufferSize,
    247                                                  mTotalPixels * 4,
    248                                                  mWhiteBalanceScale[0],
    249                                                  mWhiteBalanceScale[1],
    250                                                  mWhiteBalanceScale[2],
    251                                                  mExposureCompensation);
    252     if (query_res == NO_ERROR) {
    253         /* Timestamp the current frame, and notify the camera HAL. */
    254         mCurFrameTimestamp = systemTime(SYSTEM_TIME_MONOTONIC);
    255         mCameraHAL->onNextFrameAvailable(mCurrentFrame, mCurFrameTimestamp, this);
    256         return true;
    257     } else {
    258         ALOGE("%s: Unable to get current video frame: %s",
    259              __FUNCTION__, strerror(query_res));
    260         mCameraHAL->onCameraDeviceError(CAMERA_ERROR_SERVER_DIED);
    261         return false;
    262     }
    263 }
    264 
    265 }; /* namespace android */
    266