Implement device enumeration for PPB_VideoCapture_Dev.

content/renderer/pepper_platform_video_capture_impl.cc

+// Copyright (c) 2012 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 "content/renderer/pepper_platform_video_capture_impl.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "base/message_loop_proxy.h"
+#include "content/renderer/media/video_capture_impl_manager.h"
+#include "content/renderer/pepper_plugin_delegate_impl.h"
+#include "content/renderer/render_thread_impl.h"
+#include "media/video/capture/video_capture_proxy.h"
+
+PepperPlatformVideoCaptureImpl::PepperPlatformVideoCaptureImpl(
+    const base::WeakPtr<PepperPluginDelegateImpl>& plugin_delegate,
+    const std::string& device_id,
+    webkit::ppapi::PluginDelegate::PlatformVideoCaptureEventHandler* handler)
+    : plugin_delegate_(plugin_delegate),
+      device_id_(device_id),
+      session_id_(0),
+      ALLOW_THIS_IN_INITIALIZER_LIST(
+          handler_proxy_(new media::VideoCaptureHandlerProxy(
+              this, base::MessageLoopProxy::current()))),
+      handler_(handler),
+      video_capture_(NULL),
+      unbalanced_start_(false) {
+  if (device_id.empty()) {
+    // "1" is the session ID for the default device.
+    session_id_ = 1;
+    Initialize();
+  } else {
+    // We need to open the device and obtain the label and session ID before
+    // initializing.
+    if (plugin_delegate_) {
+      plugin_delegate_->OpenDevice(
+          PP_DEVICETYPE_DEV_VIDEOCAPTURE, device_id,
+          base::Bind(&PepperPlatformVideoCaptureImpl::OnDeviceOpened, this));
+    }
+  }
+}
+
+PepperPlatformVideoCaptureImpl::~PepperPlatformVideoCaptureImpl() {
+  if (video_capture_) {
+    VideoCaptureImplManager* manager =
+        RenderThreadImpl::current()->video_capture_impl_manager();
+    manager->RemoveDevice(session_id_, handler_proxy_.get());
+  }
+
+  if (plugin_delegate_ && !label_.empty())
+    plugin_delegate_->CloseDevice(label_);
+}
+
+void PepperPlatformVideoCaptureImpl::StartCapture(
+    media::VideoCapture::EventHandler* handler,
+    const VideoCaptureCapability& capability) {
+  DCHECK(handler == handler_);
+
+  if (unbalanced_start_)
+    return;
+
+  if (video_capture_) {
+    unbalanced_start_ = true;
+    AddRef();  // Will be balanced in OnRemoved().
+    video_capture_->StartCapture(handler_proxy_.get(), capability);
+  }
+}
+
+void PepperPlatformVideoCaptureImpl::StopCapture(
+    media::VideoCapture::EventHandler* handler) {
+  DCHECK(handler == handler_);
+  if (!unbalanced_start_)
+    return;
+
+  if (video_capture_) {
+    unbalanced_start_ = false;
+    video_capture_->StopCapture(handler_proxy_.get());
+  }
+}
+
+void PepperPlatformVideoCaptureImpl::FeedBuffer(
+    scoped_refptr<VideoFrameBuffer> buffer) {
+  if (video_capture_)
+    video_capture_->FeedBuffer(buffer);
+}
+
+bool PepperPlatformVideoCaptureImpl::CaptureStarted() {
+  return handler_proxy_->state().started;
+}
+
+int PepperPlatformVideoCaptureImpl::CaptureWidth() {
+  return handler_proxy_->state().width;
+}
+
+int PepperPlatformVideoCaptureImpl::CaptureHeight() {
+  return handler_proxy_->state().height;
+}
+
+int PepperPlatformVideoCaptureImpl::CaptureFrameRate() {
+  return handler_proxy_->state().frame_rate;
+}
+
+void PepperPlatformVideoCaptureImpl::DetachEventHandler() {
+  handler_ = NULL;
+  StopCapture(NULL);
+}
+
+void PepperPlatformVideoCaptureImpl::OnStarted(VideoCapture* capture) {
+  if (handler_)
+    handler_->OnStarted(capture);
+}
+
+void PepperPlatformVideoCaptureImpl::OnStopped(VideoCapture* capture) {
+  if (handler_)
+    handler_->OnStopped(capture);
+}
+
+void PepperPlatformVideoCaptureImpl::OnPaused(VideoCapture* capture) {
+  if (handler_)
+    handler_->OnPaused(capture);
+}
+
+void PepperPlatformVideoCaptureImpl::OnError(
+    VideoCapture* capture,
+    int error_code) {
+  if (handler_)
+    handler_->OnError(capture, error_code);
+}
+
+void PepperPlatformVideoCaptureImpl::OnRemoved(VideoCapture* capture) {
+  if (handler_)
+    handler_->OnRemoved(capture);
+
+  Release();  // Balance the AddRef() in StartCapture().
+}
+
+void PepperPlatformVideoCaptureImpl::OnBufferReady(
+    VideoCapture* capture,
+    scoped_refptr<VideoFrameBuffer> buffer) {
+  if (handler_) {
+    handler_->OnBufferReady(capture, buffer);
+  } else {
+    // Even after handler_ is detached, we have to return buffers that are in
+    // flight to us. Otherwise VideoCaptureController will not tear down.
+    FeedBuffer(buffer);
+  }
+}
+
+void PepperPlatformVideoCaptureImpl::OnDeviceInfoReceived(
+    VideoCapture* capture,
+    const media::VideoCaptureParams& device_info) {
+  if (handler_)
+    handler_->OnDeviceInfoReceived(capture, device_info);
+}
+
+void PepperPlatformVideoCaptureImpl::Initialize() {
+  VideoCaptureImplManager* manager =
+      RenderThreadImpl::current()->video_capture_impl_manager();
+  video_capture_ = manager->AddDevice(session_id_, handler_proxy_.get());
+}
+
+void PepperPlatformVideoCaptureImpl::OnDeviceOpened(int request_id,
+                                                    bool succeeded,
+                                                    const std::string& label) {
+  succeeded = succeeded && plugin_delegate_;
+  if (succeeded) {
+    label_ = label;
+    session_id_ = plugin_delegate_->GetSessionID(PP_DEVICETYPE_DEV_VIDEOCAPTURE,
+                                                 label);
+    Initialize();
+  }
+
+  if (handler_)
+    handler_->OnInitialized(this, succeeded);
+}