Introduced SpeechRecognitionDispatcher(Host) classes, handling dispatch of IPC messages for continu…

content/renderer/speech_recognition_dispatcher.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/speech_recognition_dispatcher.h"
+
+#include "base/basictypes.h"
+#include "base/utf_string_conversions.h"
+#include "content/common/speech_recognition_messages.h"
+#include "content/renderer/render_view_impl.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebVector.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebSpeechGrammar.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebSpeechRecognitionParams.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebSpeechRecognitionResult.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebSpeechRecognizer.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebSpeechRecognizerClient.h"
+
+using content::SpeechRecognitionError;
+using content::SpeechRecognitionResult;
+using WebKit::WebVector;
+using WebKit::WebString;
+using WebKit::WebSpeechGrammar;
+using WebKit::WebSpeechRecognitionHandle;
+using WebKit::WebSpeechRecognitionResult;
+using WebKit::WebSpeechRecognitionParams;
+using WebKit::WebSpeechRecognizerClient;
+
+SpeechRecognitionDispatcher::SpeechRecognitionDispatcher(
+    RenderViewImpl* render_view)
+    : content::RenderViewObserver(render_view),
+      recognizer_client_(NULL),
+      last_mapping_id_(0) {
+}
+
+SpeechRecognitionDispatcher::~SpeechRecognitionDispatcher() {
+}
+
+bool SpeechRecognitionDispatcher::OnMessageReceived(
+    const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(SpeechRecognitionDispatcher, message)
+    IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_Started,      OnRecognitionStarted)
+    IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_AudioStarted, OnAudioStarted)
+    IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_SoundStarted, OnSoundStarted)
+    IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_SoundEnded,   OnSoundEnded)
+    IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_AudioEnded,   OnAudioEnded)
+    IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_ErrorOccurred,OnErrorOccurred)
+    IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_Ended,        OnRecognitionEnded)
+    IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_ResultRetrieved,
+                        OnResultRetrieved)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void SpeechRecognitionDispatcher::start(
+    const WebSpeechRecognitionHandle& handle,
+    const WebSpeechRecognitionParams& params,
+    WebSpeechRecognizerClient* recognizer_client) {
+  //TODO(primiano) What to do if a start is issued to an already started object?
+  DCHECK(!recognizer_client_ || recognizer_client_ == recognizer_client);
+  recognizer_client_ = recognizer_client;
+
+  SpeechRecognitionHostMsg_StartRequest_Params msg_params;
+  for (size_t i = 0; i < params.grammars().size(); ++i) {
+    const WebSpeechGrammar& grammar = params.grammars()[i];
+    msg_params.grammars.push_back(
+        content::SpeechRecognitionGrammar(grammar.src().spec(),
+                                          grammar.weight()));
+  }
+  msg_params.language = UTF16ToUTF8(params.language());
+  msg_params.is_one_shot = !params.continuous();
+  msg_params.origin_url = "";  // TODO(primiano) we need an origin from WebKit.
+  msg_params.render_view_id = routing_id();
+  msg_params.js_handle_id = GetIDForHandle(handle);
+  Send(new SpeechRecognitionHostMsg_StartRequest(msg_params));
+}
+
+void SpeechRecognitionDispatcher::stop(
+    const WebSpeechRecognitionHandle& handle,
+    WebSpeechRecognizerClient* recognizer_client) {
+  DCHECK(recognizer_client_ == recognizer_client);
+  Send(new SpeechRecognitionHostMsg_StopCaptureRequest(routing_id(),
+                                                       GetIDForHandle(handle)));
+}
+
+void SpeechRecognitionDispatcher::abort(
+    const WebSpeechRecognitionHandle& handle,
+    WebSpeechRecognizerClient* recognizer_client) {
+  Send(new SpeechRecognitionHostMsg_AbortRequest(routing_id(),
+                                                 GetIDForHandle(handle)));
+}
+
+void SpeechRecognitionDispatcher::OnRecognitionStarted(int js_handle_id) {
+  DCHECK(recognizer_client_);
+  recognizer_client_->didStart(GetHandleFromID(js_handle_id));
+}
+
+void SpeechRecognitionDispatcher::OnAudioStarted(int js_handle_id) {
+  DCHECK(recognizer_client_);
+  recognizer_client_->didStartAudio(GetHandleFromID(js_handle_id));
+}
+
+void SpeechRecognitionDispatcher::OnSoundStarted(int js_handle_id) {
+  DCHECK(recognizer_client_);
+  recognizer_client_->didStartSound(GetHandleFromID(js_handle_id));
+}
+
+void SpeechRecognitionDispatcher::OnSoundEnded(int js_handle_id) {
+  DCHECK(recognizer_client_);
+  recognizer_client_->didEndSound(GetHandleFromID(js_handle_id));
+}
+
+void SpeechRecognitionDispatcher::OnAudioEnded(int js_handle_id) {
+  DCHECK(recognizer_client_);
+  recognizer_client_->didEndAudio(GetHandleFromID(js_handle_id));
+}
+
+void SpeechRecognitionDispatcher::OnErrorOccurred(
+    int js_handle_id, const SpeechRecognitionError& error) {
+  DCHECK(recognizer_client_);
+  if (error.code == content::SPEECH_RECOGNITION_ERROR_NO_MATCH) {
+    recognizer_client_->didReceiveNoMatch(GetHandleFromID(js_handle_id),
+                                          WebSpeechRecognitionResult());
+  } else {
+    recognizer_client_->didReceiveError(GetHandleFromID(js_handle_id),
+                                        WebString(), // TODO(primiano) message?
+                                        error.code);
+  }
+}
+
+void SpeechRecognitionDispatcher::OnRecognitionEnded(int js_handle_id) {
+  DCHECK(recognizer_client_);
+  recognizer_client_->didEnd(GetHandleFromID(js_handle_id));
+  handle_map_.erase(js_handle_id);
+}
+
+void SpeechRecognitionDispatcher::OnResultRetrieved(
+    int js_handle_id, const SpeechRecognitionResult& result) {
+  DCHECK(recognizer_client_);
+
+  const size_t num_hypotheses = result.hypotheses.size();
+  WebSpeechRecognitionResult webkit_result;
+  WebVector<WebString> transcripts(num_hypotheses);
+  WebVector<float> confidences(num_hypotheses);
+  for (size_t i = 0; i < num_hypotheses; ++i) {
+    transcripts[i] = result.hypotheses[i].utterance;
+    confidences[i] = static_cast<float>(result.hypotheses[i].confidence);
+  }
+  webkit_result.assign(transcripts, confidences, !result.provisional);
+  // TODO(primiano) Handle history, currently empty.
+  WebVector<WebSpeechRecognitionResult> empty_history;
+  recognizer_client_->didReceiveResult(GetHandleFromID(js_handle_id),
+                                       webkit_result,
+                                       0, // result_index
+                                       empty_history);
+}
+
+int SpeechRecognitionDispatcher::GetIDForHandle(
+    const WebSpeechRecognitionHandle& handle) {
+  // Search first for an existing mapping.
+  for (HandleMap::iterator iter = handle_map_.begin();
+      iter != handle_map_.end();
+      ++iter) {
+    if (iter->second.equals(handle))
+      return iter->first;
+  }
+  // If no existing mapping found, create a new one.
+  ++last_mapping_id_;
+  handle_map_[last_mapping_id_] = handle;
+  return last_mapping_id_;
+}
+
+const WebSpeechRecognitionHandle& SpeechRecognitionDispatcher::GetHandleFromID(
+    int js_handle_id) {
+  HandleMap::iterator iter = handle_map_.find(js_handle_id);
+  DCHECK(iter != handle_map_.end());
+  return iter->second;
+}