hals/camera/EmulatedQemuCameraDevice.cpp

/*
 * 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 "EmulatedQemuCameraDevice.h"
#include <log/log.h>
#include "EmulatedQemuCamera.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) {
    ALOGV("%s: Connected to the emulated camera service '%s'", __FUNCTION__,
          device_name);
    mDeviceName = device_name;
  } else {
    mQemuClient.queryDisconnect();
  }

  return res;
}

/****************************************************************************
 * Emulated camera device abstract interface implementation.
 ***************************************************************************/

status_t EmulatedQemuCameraDevice::connectDevice() {
  ALOGV("%s", __FUNCTION__);

  Mutex::Autolock locker(&mObjectLock);
  if (!isInitialized()) {
    ALOGE("%s: Qemu camera device is not initialized.", __FUNCTION__);
    return EINVAL;
  }
  if (isConnected()) {
    ALOGW("%s: Qemu camera device '%s' is already connected.", __FUNCTION__,
          (const char*)mDeviceName);
    return NO_ERROR;
  }

  /* Connect to the camera device via emulator. */
  const status_t res = mQemuClient.queryConnect();
  if (res == NO_ERROR) {
    ALOGV("%s: Connected to device '%s'", __FUNCTION__,
          (const char*)mDeviceName);
    mState = ECDS_CONNECTED;
  } else {
    ALOGE("%s: Connection to device '%s' failed", __FUNCTION__,
          (const char*)mDeviceName);
  }

  return res;
}

status_t EmulatedQemuCameraDevice::disconnectDevice() {
  ALOGV("%s", __FUNCTION__);

  Mutex::Autolock locker(&mObjectLock);
  if (!isConnected()) {
    ALOGW("%s: Qemu camera device '%s' is already disconnected.", __FUNCTION__,
          (const char*)mDeviceName);
    return NO_ERROR;
  }
  if (isStarted()) {
    ALOGE("%s: Cannot disconnect from the started device '%s.", __FUNCTION__,
          (const char*)mDeviceName);
    return EINVAL;
  }

  /* Disconnect from the camera device via emulator. */
  const status_t res = mQemuClient.queryDisconnect();
  if (res == NO_ERROR) {
    ALOGV("%s: Disonnected from device '%s'", __FUNCTION__,
          (const char*)mDeviceName);
    mState = ECDS_INITIALIZED;
  } else {
    ALOGE("%s: Disconnection from device '%s' failed", __FUNCTION__,
          (const char*)mDeviceName);
  }

  return res;
}

status_t EmulatedQemuCameraDevice::startDevice(int width, int height,
                                               uint32_t pix_fmt, int fps) {
  ALOGV("%s", __FUNCTION__);

  Mutex::Autolock locker(&mObjectLock);
  if (!isConnected()) {
    ALOGE("%s: Qemu camera device '%s' is not connected.", __FUNCTION__,
          (const char*)mDeviceName);
    return EINVAL;
  }
  if (isStarted()) {
    ALOGW("%s: Qemu camera device '%s' is already started.", __FUNCTION__,
          (const char*)mDeviceName);
    return NO_ERROR;
  }

  status_t res =
      EmulatedCameraDevice::commonStartDevice(width, height, pix_fmt, fps);
  if (res != NO_ERROR) {
    ALOGE("%s: commonStartDevice failed", __FUNCTION__);
    return res;
  }

  /* Allocate preview frame buffer. */
  /* TODO: Watch out for preview format changes! At this point we implement
   * RGB32 only.*/
  mPreviewFrame = new uint32_t[mTotalPixels];
  if (mPreviewFrame == NULL) {
    ALOGE("%s: Unable to allocate %d bytes for preview frame", __FUNCTION__,
          mTotalPixels);
    return ENOMEM;
  }

  /* Start the actual camera device. */
  res = mQemuClient.queryStart(mPixelFormat, mFrameWidth, mFrameHeight);
  if (res == NO_ERROR) {
    ALOGV("%s: Qemu camera device '%s' is started for %.4s[%dx%d] frames",
          __FUNCTION__, (const char*)mDeviceName,
          reinterpret_cast<const char*>(&mPixelFormat), mFrameWidth,
          mFrameHeight);
    mState = ECDS_STARTED;
  } else {
    ALOGE("%s: Unable to start device '%s' for %.4s[%dx%d] frames",
          __FUNCTION__, (const char*)mDeviceName,
          reinterpret_cast<const char*>(&pix_fmt), width, height);
  }

  return res;
}

status_t EmulatedQemuCameraDevice::stopDevice() {
  ALOGV("%s", __FUNCTION__);

  Mutex::Autolock locker(&mObjectLock);
  if (!isStarted()) {
    ALOGW("%s: Qemu camera device '%s' is not started.", __FUNCTION__,
          (const char*)mDeviceName);
    return NO_ERROR;
  }

  /* Stop the actual camera device. */
  status_t res = mQemuClient.queryStop();
  if (res == NO_ERROR) {
    if (mPreviewFrame == NULL) {
      delete[] mPreviewFrame;
      mPreviewFrame = NULL;
    }
    EmulatedCameraDevice::commonStopDevice();
    mState = ECDS_CONNECTED;
    ALOGV("%s: Qemu camera device '%s' is stopped", __FUNCTION__,
          (const char*)mDeviceName);
  } else {
    ALOGE("%s: Unable to stop device '%s'", __FUNCTION__,
          (const char*)mDeviceName);
  }

  return res;
}

/****************************************************************************
 * EmulatedCameraDevice virtual overrides
 ***************************************************************************/

status_t EmulatedQemuCameraDevice::getCurrentPreviewFrame(void* buffer) {
  ALOGW_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) {
    ALOGV("%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,
      mWhiteBalanceScale[0], mWhiteBalanceScale[1], mWhiteBalanceScale[2],
      mExposureCompensation);
  if (query_res == NO_ERROR) {
    /* Timestamp the current frame, and notify the camera HAL. */
    mCurFrameTimestamp = systemTime(SYSTEM_TIME_MONOTONIC);
    mCameraHAL->onNextFrameAvailable(mCurrentFrame, mCurFrameTimestamp, this);
    return true;
  } else {
    ALOGE("%s: Unable to get current video frame: %s", __FUNCTION__,
          strerror(query_res));
    mCameraHAL->onCameraDeviceError(CAMERA_ERROR_SERVER_DIED);
    return false;
  }
}

}; /* namespace android */