Refactored emulated camera HAL to comply with code style

Change-Id: If57b536ae6b1f9bad4213630488591a3b3cc9fdd

tools/emulator/system/camera/EmulatedQemuCameraDevice.cpp

@@ -0,0 +1,243 @@
+/*
+ * Copyright (C) 2011 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.
+ */
+
+/*
+ * Contains implementation of a class EmulatedQemuCameraDevice that encapsulates
+ * an emulated camera device connected to the host.
+ */
+
+#define LOG_NDEBUG 0
+#define LOG_TAG "EmulatedCamera_QemuDevice"
+#include <cutils/log.h>
+#include "EmulatedQemuCamera.h"
+#include "EmulatedQemuCameraDevice.h"
+
+namespace android {
+
+EmulatedQemuCameraDevice::EmulatedQemuCameraDevice(EmulatedQemuCamera* camera_hal)
+    : EmulatedCameraDevice(camera_hal),
+      mQemuClient(),
+      mPreviewFrame(NULL)
+{
+}
+
+EmulatedQemuCameraDevice::~EmulatedQemuCameraDevice()
+{
+    if (mPreviewFrame != NULL) {
+        delete[] mPreviewFrame;
+    }
+}
+
+/****************************************************************************
+ * Public API
+ ***************************************************************************/
+
+status_t EmulatedQemuCameraDevice::Initialize(const char* device_name)
+{
+    /* Connect to the service. */
+    char connect_str[256];
+    snprintf(connect_str, sizeof(connect_str), "name=%s", device_name);
+    status_t res = mQemuClient.connectClient(connect_str);
+    if (res != NO_ERROR) {
+        return res;
+    }
+
+    /* Initialize base class. */
+    res = EmulatedCameraDevice::Initialize();
+    if (res == NO_ERROR) {
+        LOGV("%s: Connected to the emulated camera service '%s'",
+             __FUNCTION__, device_name);
+        mDeviceName = device_name;
+    } else {
+        mQemuClient.disconnectDevice();
+    }
+
+    return res;
+}
+
+/****************************************************************************
+ * Emulated camera device abstract interface implementation.
+ ***************************************************************************/
+
+status_t EmulatedQemuCameraDevice::connectDevice()
+{
+    LOGV("%s", __FUNCTION__);
+
+    Mutex::Autolock locker(&mObjectLock);
+    if (!isInitialized()) {
+        LOGE("%s: Qemu camera device is not initialized.", __FUNCTION__);
+        return EINVAL;
+    }
+    if (isConnected()) {
+        LOGW("%s: Qemu camera device is already connected.", __FUNCTION__);
+        return NO_ERROR;
+    }
+
+    const status_t res = mQemuClient.queryConnect();
+    if (res == NO_ERROR) {
+        LOGV("%s: Connected", __FUNCTION__);
+        mState = ECDS_CONNECTED;
+    } else {
+        LOGE("%s: Connection failed", __FUNCTION__);
+    }
+
+    return res;
+}
+
+status_t EmulatedQemuCameraDevice::disconnectDevice()
+{
+    LOGV("%s", __FUNCTION__);
+
+    Mutex::Autolock locker(&mObjectLock);
+    if (!isConnected()) {
+        LOGW("%s: Qemu camera device is already disconnected.", __FUNCTION__);
+        return NO_ERROR;
+    }
+    if (isCapturing()) {
+        LOGE("%s: Cannot disconnect while in the capturing state.", __FUNCTION__);
+        return EINVAL;
+    }
+
+    const status_t res = mQemuClient.queryDisconnect();
+    if (res == NO_ERROR) {
+        LOGV("%s: Disonnected", __FUNCTION__);
+        mState = ECDS_INITIALIZED;
+    } else {
+        LOGE("%s: Disconnection failed", __FUNCTION__);
+    }
+
+    return res;
+}
+
+status_t EmulatedQemuCameraDevice::startDevice()
+{
+    LOGV("%s", __FUNCTION__);
+
+    Mutex::Autolock locker(&mObjectLock);
+    if (!isConnected()) {
+        LOGE("%s: Qemu camera device is not connected.", __FUNCTION__);
+        return EINVAL;
+    }
+    if (isCapturing()) {
+        LOGW("%s: Qemu camera device is already capturing.", __FUNCTION__);
+        return NO_ERROR;
+    }
+
+    /* Allocate preview frame buffer. */
+    /* TODO: Watch out for preview format changes! At this point we implement
+     * RGB32 only.*/
+    mPreviewFrame = new uint16_t[mTotalPixels * 4];
+    if (mPreviewFrame == NULL) {
+        LOGE("%s: Unable to allocate %d bytes for preview frame",
+             __FUNCTION__, mTotalPixels * 4);
+        return ENOMEM;
+    }
+    memset(mPreviewFrame, 0, mTotalPixels * 4);
+
+    /* Start the actual camera device. */
+    status_t res =
+        mQemuClient.queryStart(mPixelFormat, mFrameWidth, mFrameHeight);
+    if (res == NO_ERROR) {
+        /* Start the worker thread. */
+        res = startWorkerThread();
+        if (res == NO_ERROR) {
+            mState = ECDS_CAPTURING;
+        } else {
+            mQemuClient.queryStop();
+        }
+    } else {
+        LOGE("%s: Start failed", __FUNCTION__);
+    }
+
+    return res;
+}
+
+status_t EmulatedQemuCameraDevice::stopDevice()
+{
+    LOGV("%s", __FUNCTION__);
+
+    Mutex::Autolock locker(&mObjectLock);
+    if (!isCapturing()) {
+        LOGW("%s: Qemu camera device is not capturing.", __FUNCTION__);
+        return NO_ERROR;
+    }
+
+    /* Stop the actual camera device. */
+    status_t res = mQemuClient.queryStop();
+    if (res == NO_ERROR) {
+        /* Stop the worker thread. */
+        res = stopWorkerThread();
+        if (res == NO_ERROR) {
+            if (mPreviewFrame == NULL) {
+                delete[] mPreviewFrame;
+                mPreviewFrame = NULL;
+            }
+            mState = ECDS_CONNECTED;
+            LOGV("%s: Stopped", __FUNCTION__);
+        }
+    } else {
+        LOGE("%s: Stop failed", __FUNCTION__);
+    }
+
+    return res;
+}
+
+/****************************************************************************
+ * EmulatedCameraDevice virtual overrides
+ ***************************************************************************/
+
+status_t EmulatedQemuCameraDevice::getCurrentPreviewFrame(void* buffer)
+{
+    LOGW_IF(mPreviewFrame == NULL, "%s: No preview frame", __FUNCTION__);
+    if (mPreviewFrame != NULL) {
+        memcpy(buffer, mPreviewFrame, mTotalPixels * 4);
+        return 0;
+    } else {
+        return EmulatedCameraDevice::getCurrentPreviewFrame(buffer);
+    }
+}
+
+/****************************************************************************
+ * Worker thread management overrides.
+ ***************************************************************************/
+
+bool EmulatedQemuCameraDevice::inWorkerThread()
+{
+    /* Wait till FPS timeout expires, or thread exit message is received. */
+    WorkerThread::SelectRes res =
+        getWorkerThread()->Select(-1, 1000000 / mEmulatedFPS);
+    if (res == WorkerThread::EXIT_THREAD) {
+        LOGV("%s: Worker thread has been terminated.", __FUNCTION__);
+        return false;
+    }
+
+    /* Query frames from the service. */
+    status_t query_res = mQemuClient.queryFrame(mCurrentFrame, mPreviewFrame,
+                                                 mFrameBufferSize,
+                                                 mTotalPixels * 4);
+    if (query_res == NO_ERROR) {
+        /* Timestamp the current frame, and notify the camera HAL. */
+        mCurFrameTimestamp = systemTime(SYSTEM_TIME_MONOTONIC);
+        mCameraHAL->onNextFrameAvailable(mCurrentFrame, mCurFrameTimestamp, this);
+    } else {
+        LOGE("%s: Unable to get current video frame: %s",
+             __FUNCTION__, strerror(query_res));
+    }
+
+    return true;
+}
+
+}; /* namespace android */