Add the whispernet proxy.

chrome/browser/copresence/chrome_whispernet_client.cc

+// Copyright 2014 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/copresence/chrome_whispernet_client.h"
+
+#include "chrome/browser/extensions/api/copresence_private/copresence_private_api.h"
+#include "chrome/browser/extensions/component_loader.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/common/extensions/api/copresence_private.h"
+#include "content/public/browser/browser_context.h"
+#include "extensions/browser/event_router.h"
+#include "extensions/browser/extension_system.h"
+#include "grit/browser_resources.h"
+
+namespace copresence {
+
+// Once the CL for the copresence component lands, these constants will be
+// need to be picked up from components/copresence/copresence_constants.h
+const int kDefaultRepetitions = 5;
+const float kDefaultSampleRate = 48000.0;
+const int kDefaultBitsPerSample = 16;
+const float kDefaultCarrierFrequency = 18500.0;
+const int kDefaultChannels = 2;
+
+}  // namespace copresence
+
+// static
+const char ChromeWhispernetClient::kWhispernetProxyExtensionId[] =
+    "bpfmnplchembfbdgieamdodgaencleal";
+
+// Public:
+
+ChromeWhispernetClient::ChromeWhispernetClient(
+    content::BrowserContext* browser_context)
+    : browser_context_(browser_context), extension_loaded_(false) {
+}
+
+ChromeWhispernetClient::~ChromeWhispernetClient() {
+}
+
+void ChromeWhispernetClient::Initialize(const SuccessCallback& init_callback) {
+  DVLOG(3) << "Initializing whispernet proxy client.";
+  init_callback_ = init_callback;
+
+  extensions::ExtensionSystem* es =
+      extensions::ExtensionSystem::Get(browser_context_);
+  DCHECK(es);
+  ExtensionService* service = es->extension_service();
+  DCHECK(service);
+  extensions::ComponentLoader* loader = service->component_loader();
+  DCHECK(loader);
+
+  // This callback is cancelled in Shutdown().
+  extension_loaded_callback_ = base::Bind(
+      &ChromeWhispernetClient::OnExtensionLoaded, base::Unretained(this));
+
+  if (!loader->Exists(kWhispernetProxyExtensionId)) {
+    DVLOG(3) << "Loading Whispernet proxy.";
+    loader->Add(IDR_WHISPERNET_PROXY_MANIFEST,
+                base::FilePath(FILE_PATH_LITERAL("whispernet_proxy")));
+  } else {
+    init_callback_.Run(true);
+  }
+}
+
+void ChromeWhispernetClient::Shutdown() {
+  extension_loaded_callback_.Reset();
+  init_callback_.Reset();
+  tokens_callback_.Reset();
+  samples_callback_.Reset();
+  db_callback_.Reset();
+}
+
+// Fire an event to request a token encode.
+void ChromeWhispernetClient::EncodeToken(const std::string& token) {
+  DCHECK(extension_loaded_);
+  DCHECK(browser_context_);
+  DCHECK(extensions::EventRouter::Get(browser_context_));
+
+  scoped_ptr<extensions::Event> event(new extensions::Event(
+      extensions::api::copresence_private::OnEncodeTokenRequest::kEventName,
+      extensions::api::copresence_private::OnEncodeTokenRequest::Create(token),
+      browser_context_));
+
+  extensions::EventRouter::Get(browser_context_)
+      ->DispatchEventToExtension(kWhispernetProxyExtensionId, event.Pass());
+}
+
+// Fire an event to request a decode for the given samples.
+void ChromeWhispernetClient::DecodeSamples(const std::string& samples) {
+  DCHECK(extension_loaded_);
+  DCHECK(browser_context_);
+  DCHECK(extensions::EventRouter::Get(browser_context_));
+
+  scoped_ptr<extensions::Event> event(new extensions::Event(
+      extensions::api::copresence_private::OnDecodeSamplesRequest::kEventName,
+      extensions::api::copresence_private::OnDecodeSamplesRequest::Create(
+          samples),
+      browser_context_));
+
+  extensions::EventRouter::Get(browser_context_)
+      ->DispatchEventToExtension(kWhispernetProxyExtensionId, event.Pass());
+}
+
+void ChromeWhispernetClient::DetectBroadcast() {
+  DCHECK(extension_loaded_);
+  DCHECK(browser_context_);
+  DCHECK(extensions::EventRouter::Get(browser_context_));
+
+  scoped_ptr<extensions::Event> event(new extensions::Event(
+      extensions::api::copresence_private::OnDetectBroadcastRequest::kEventName,
+      make_scoped_ptr(new base::ListValue()),
+      browser_context_));
+
+  extensions::EventRouter::Get(browser_context_)
+      ->DispatchEventToExtension(kWhispernetProxyExtensionId, event.Pass());
+}
+
+void ChromeWhispernetClient::RegisterTokensCallback(
+    const TokensCallback& tokens_callback) {
+  tokens_callback_ = tokens_callback;
+}
+
+void ChromeWhispernetClient::RegisterSamplesCallback(
+    const SamplesCallback& samples_callback) {
+  samples_callback_ = samples_callback;
+}
+
+void ChromeWhispernetClient::RegisterDetectBroadcastCallback(
+    const SuccessCallback& db_callback) {
+  db_callback_ = db_callback;
+}
+
+ChromeWhispernetClient::TokensCallback
+ChromeWhispernetClient::GetTokensCallback() {
+  return tokens_callback_;
+}
+
+ChromeWhispernetClient::SamplesCallback
+ChromeWhispernetClient::GetSamplesCallback() {
+  return samples_callback_;
+}
+
+ChromeWhispernetClient::SuccessCallback
+ChromeWhispernetClient::GetDetectBroadcastCallback() {
+  return db_callback_;
+}
+
+ChromeWhispernetClient::SuccessCallback
+ChromeWhispernetClient::GetInitializedCallback() {
+  return extension_loaded_callback_;
+}
+
+// Private:
+
+// Fire an event to initialize whispernet with the given parameters.
+void ChromeWhispernetClient::InitializeWhispernet(
+    const extensions::api::copresence_private::AudioParameters& params) {
+  DCHECK(browser_context_);
+  DCHECK(extensions::EventRouter::Get(browser_context_));
+
+  scoped_ptr<extensions::Event> event(new extensions::Event(
+      extensions::api::copresence_private::OnInitialize::kEventName,
+      extensions::api::copresence_private::OnInitialize::Create(params),
+      browser_context_));
+
+  extensions::EventRouter::Get(browser_context_)
+      ->DispatchEventToExtension(kWhispernetProxyExtensionId, event.Pass());
+}
+
+void ChromeWhispernetClient::OnExtensionLoaded(bool success) {
+  if (extension_loaded_) {
+    if (!init_callback_.is_null())
+      init_callback_.Run(success);
+    return;
+  }
+
+  // Our extension just got loaded, initialize whispernet.
+  extension_loaded_ = true;
+
+  // This will fire another OnExtensionLoaded call once the initialization is
+  // done, which means we've initialized for realz, hence call the init
+  // callback.
+
+  // At this point, we have the same parameters for record and play. This
+  // may change later though (ongoing discussion with research).
+  extensions::api::copresence_private::AudioParameters params;
+  params.play.sample_rate = copresence::kDefaultSampleRate;
+  params.play.bits_per_sample = copresence::kDefaultBitsPerSample;
+  params.play.carrier_frequency = copresence::kDefaultCarrierFrequency;
+  params.play.repetitions = copresence::kDefaultRepetitions;
+
+  params.record.sample_rate = copresence::kDefaultSampleRate;
+  params.record.bits_per_sample = copresence::kDefaultBitsPerSample;
+  params.record.carrier_frequency = copresence::kDefaultCarrierFrequency;
+  params.record.channels = copresence::kDefaultChannels;
+
+  InitializeWhispernet(params);
+}