Implement device enumeration for PPB_VideoCapture_Dev.

ppapi/cpp/dev/video_capture_dev.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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 "ppapi/cpp/dev/video_capture_dev.h"
 
 #include "ppapi/c/dev/ppb_video_capture_dev.h"
 #include "ppapi/c/pp_errors.h"
+#include "ppapi/cpp/completion_callback.h"
+#include "ppapi/cpp/dev/device_ref_dev.h"
+#include "ppapi/cpp/dev/resource_array_dev.h"
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/module_impl.h"
 
 namespace pp {
 
 namespace {
 
 template <> const char* interface_name<PPB_VideoCapture_Dev>() {
   return PPB_VIDEOCAPTURE_DEV_INTERFACE;
 }
 
 }  // namespace
 
-VideoCapture_Dev::VideoCapture_Dev(const Instance& instance) {
+struct VideoCapture_Dev::EnumerateDevicesState {
+  EnumerateDevicesState(std::vector<DeviceRef_Dev>* in_devices,
+                        const CompletionCallback& in_callback,
+                        VideoCapture_Dev* in_video_capture)
+      : devices_resource(0),
+        devices(in_devices),
+        callback(in_callback),
+        video_capture(in_video_capture) {
+  }
+
+  PP_Resource devices_resource;
+  std::vector<DeviceRef_Dev>* devices;
+  CompletionCallback callback;
+  VideoCapture_Dev* video_capture;
+};
+
+VideoCapture_Dev::VideoCapture_Dev(const Instance& instance)
+    : enum_state_(NULL) {
   if (!has_interface<PPB_VideoCapture_Dev>())
     return;
   PassRefFromConstructor(get_interface<PPB_VideoCapture_Dev>()->Create(
       instance.pp_instance()));
 }
 
-VideoCapture_Dev::VideoCapture_Dev(PP_Resource resource) : Resource(resource) {
+VideoCapture_Dev::VideoCapture_Dev(PP_Resource resource)
+    : Resource(resource),
+      enum_state_(NULL) {
 }
 
 VideoCapture_Dev::VideoCapture_Dev(const VideoCapture_Dev& other)
-    : Resource(other) {
+    : Resource(other),
+      enum_state_(NULL) {
+}
+
+VideoCapture_Dev::~VideoCapture_Dev() {
+  AbortEnumerateDevices();
+}
+
+VideoCapture_Dev& VideoCapture_Dev::operator=(
+    const VideoCapture_Dev& other) {
+  AbortEnumerateDevices();
+
+  Resource::operator=(other);
+  return *this;
 }
 
 // static
 bool VideoCapture_Dev::IsAvailable() {
   return has_interface<PPB_VideoCapture_Dev>();
 }
 
-int32_t VideoCapture_Dev::StartCapture(
+int32_t VideoCapture_Dev::EnumerateDevices(std::vector<DeviceRef_Dev>* devices,
+                                           const CompletionCallback& callback) {
+  if (!has_interface<PPB_VideoCapture_Dev>())
+    return callback.MayForce(PP_ERROR_NOINTERFACE);
+  if (!devices)
+    return callback.MayForce(PP_ERROR_BADARGUMENT);
+  if (!callback.pp_completion_callback().func)
+    return callback.MayForce(PP_ERROR_BLOCKS_MAIN_THREAD);
+  if (enum_state_)
+    return callback.MayForce(PP_ERROR_INPROGRESS);
+
+  // It will be deleted in OnEnumerateDevicesComplete().
+  enum_state_ = new EnumerateDevicesState(devices, callback, this);
+  return get_interface<PPB_VideoCapture_Dev>()->EnumerateDevices(
+      pp_resource(), &enum_state_->devices_resource,
+      PP_MakeCompletionCallback(&VideoCapture_Dev::OnEnumerateDevicesComplete,
+                                enum_state_));
+}
+
+int32_t VideoCapture_Dev::Open(
+    const DeviceRef_Dev& device_ref,
     const PP_VideoCaptureDeviceInfo_Dev& requested_info,
-    uint32_t buffer_count) {
+    uint32_t buffer_count,
+    const CompletionCallback& callback) {
   if (!has_interface<PPB_VideoCapture_Dev>())
-    return PP_ERROR_FAILED;
-  return get_interface<PPB_VideoCapture_Dev>()->StartCapture(
-      pp_resource(), &requested_info, buffer_count);
+    return callback.MayForce(PP_ERROR_NOINTERFACE);
+  return get_interface<PPB_VideoCapture_Dev>()->Open(
+      pp_resource(), device_ref.pp_resource(), &requested_info, buffer_count,
+      callback.pp_completion_callback());
+}
+
+int32_t VideoCapture_Dev::StartCapture() {
+  if (!has_interface<PPB_VideoCapture_Dev>())
+    return PP_ERROR_NOINTERFACE;
+  return get_interface<PPB_VideoCapture_Dev>()->StartCapture(pp_resource());
 }
 
 int32_t VideoCapture_Dev::ReuseBuffer(uint32_t buffer) {
   if (!has_interface<PPB_VideoCapture_Dev>())
-    return PP_ERROR_FAILED;
+    return PP_ERROR_NOINTERFACE;
   return get_interface<PPB_VideoCapture_Dev>()->ReuseBuffer(
       pp_resource(), buffer);
 }
 
-int32_t VideoCapture_Dev::StopCapture(){
+int32_t VideoCapture_Dev::StopCapture() {
   if (!has_interface<PPB_VideoCapture_Dev>())
-    return PP_ERROR_FAILED;
+    return PP_ERROR_NOINTERFACE;
   return get_interface<PPB_VideoCapture_Dev>()->StopCapture(pp_resource());
 }
 
+void VideoCapture_Dev::Close() {
+  if (has_interface<PPB_VideoCapture_Dev>())
+    get_interface<PPB_VideoCapture_Dev>()->Close(pp_resource());
+}
+
+void VideoCapture_Dev::AbortEnumerateDevices() {
+  if (enum_state_) {
+    enum_state_->devices = NULL;
+    Module::Get()->core()->CallOnMainThread(0, enum_state_->callback,
+                                            PP_ERROR_ABORTED);
+    enum_state_->video_capture = NULL;
+    enum_state_ = NULL;
+  }
+}
+
+// static
+void VideoCapture_Dev::OnEnumerateDevicesComplete(void* user_data,
+                                                  int32_t result) {
+  EnumerateDevicesState* enum_state =
+      static_cast<EnumerateDevicesState*>(user_data);
+
+  bool need_to_callback = !!enum_state->video_capture;
+
+  if (result == PP_OK) {
+    // It will take care of releasing the reference.
+    ResourceArray_Dev resources(ResourceArray_Dev::PassRef(),
+                                enum_state->devices_resource);
+
+    if (need_to_callback) {
+      enum_state->devices->clear();
+      for (uint32_t index = 0; index < resources.size(); ++index) {
+        DeviceRef_Dev device(resources[index]);
+        enum_state->devices->push_back(device);
+      }
+    }
+  }
+
+  if (need_to_callback) {
+    enum_state->video_capture->enum_state_ = NULL;
+    enum_state->callback.Run(result);
+  }
+
+  delete enum_state;
+}
+
 }  // namespace pp