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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/chromeos/login/camera_controller.h"
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/threading/thread_restrictions.h"
namespace chromeos {
namespace {
// Maximum number of capture failures we ignore before we try to initialize
// the camera again.
const int kMaxCaptureFailureCounter = 5;
// Maximum number of camera initialization retries.
const int kMaxCameraInitFailureCounter = 3;
// Name for camera thread.
const char kCameraThreadName[] = "Chrome_CameraThread";
// Delay multiplier for camera initialization retries, milliseconds.
const int64 kInitializeDelayMs = 200;
} // namespace
CameraController::CameraController(Delegate* delegate)
: frame_width_(0),
frame_height_(0),
capture_failure_counter_(0),
camera_init_failure_counter_(0),
camera_thread_(new base::Thread(kCameraThreadName)),
delegate_(delegate) {
camera_thread_->Start();
}
CameraController::~CameraController() {
Stop();
{
// A ScopedAllowIO object is required to join the thread when calling Stop.
// See http://crosbug.com/11392.
base::ThreadRestrictions::ScopedAllowIO allow_io_for_thread_join;
camera_thread_.reset();
}
}
void CameraController::Start() {
Stop();
camera_ = new Camera(this, camera_thread_.get(), true);
camera_->Initialize(
frame_width_,
frame_height_,
kInitializeDelayMs * camera_init_failure_counter_);
}
void CameraController::Stop() {
if (camera_.get()) {
camera_->set_delegate(NULL);
camera_->Uninitialize();
camera_ = NULL;
}
}
void CameraController::GetFrame(SkBitmap* frame) const {
if (camera_.get())
camera_->GetFrame(frame);
}
void CameraController::OnInitializeSuccess() {
DCHECK(camera_.get());
camera_->StartCapturing();
}
void CameraController::OnInitializeFailure() {
++camera_init_failure_counter_;
if (camera_init_failure_counter_ > kMaxCameraInitFailureCounter) {
if (delegate_)
delegate_->OnCaptureFailure();
} else {
// Retry initializing the camera.
Start();
}
}
void CameraController::OnStartCapturingSuccess() {
}
void CameraController::OnStartCapturingFailure() {
// Try to reinitialize camera.
OnInitializeFailure();
}
void CameraController::OnCaptureSuccess() {
DCHECK(camera_.get());
capture_failure_counter_ = 0;
camera_init_failure_counter_ = 0;
if (delegate_)
delegate_->OnCaptureSuccess();
}
void CameraController::OnCaptureFailure() {
++capture_failure_counter_;
if (capture_failure_counter_ < kMaxCaptureFailureCounter)
return;
capture_failure_counter_ = 0;
OnInitializeFailure();
}
} // namespace chromeos
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