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// 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.
#ifndef CONTENT_RENDERER_SPEECH_RECOGNITION_DISPATCHER_H_
#define CONTENT_RENDERER_SPEECH_RECOGNITION_DISPATCHER_H_
#include <map>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/shared_memory.h"
#include "base/sync_socket.h"
#include "content/public/common/speech_recognition_result.h"
#include "content/public/renderer/render_view_observer.h"
#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
#include "third_party/WebKit/public/platform/WebVector.h"
#include "third_party/WebKit/public/web/WebSpeechRecognitionHandle.h"
#include "third_party/WebKit/public/web/WebSpeechRecognizer.h"
namespace media {
class AudioParameters;
}
namespace content {
class RenderViewImpl;
#if defined(ENABLE_WEBRTC)
class SpeechRecognitionAudioSink;
#endif
struct SpeechRecognitionError;
struct SpeechRecognitionResult;
// SpeechRecognitionDispatcher is a delegate for methods used by WebKit for
// scripted JS speech APIs. It's the complement of
// SpeechRecognitionDispatcherHost (owned by RenderViewHost).
class SpeechRecognitionDispatcher : public RenderViewObserver,
public blink::WebSpeechRecognizer {
public:
explicit SpeechRecognitionDispatcher(RenderViewImpl* render_view);
virtual ~SpeechRecognitionDispatcher();
// Aborts all speech recognitions.
void AbortAllRecognitions();
private:
// RenderViewObserver implementation.
bool OnMessageReceived(const IPC::Message& message) override;
// blink::WebSpeechRecognizer implementation.
virtual void start(const blink::WebSpeechRecognitionHandle&,
const blink::WebSpeechRecognitionParams&,
blink::WebSpeechRecognizerClient*);
virtual void stop(const blink::WebSpeechRecognitionHandle&,
blink::WebSpeechRecognizerClient*);
virtual void abort(const blink::WebSpeechRecognitionHandle&,
blink::WebSpeechRecognizerClient*);
void OnRecognitionStarted(int request_id);
void OnAudioStarted(int request_id);
void OnSoundStarted(int request_id);
void OnSoundEnded(int request_id);
void OnAudioEnded(int request_id);
void OnErrorOccurred(int request_id, const SpeechRecognitionError& error);
void OnRecognitionEnded(int request_id);
void OnResultsRetrieved(int request_id,
const SpeechRecognitionResults& result);
void OnAudioReceiverReady(int session_id,
const media::AudioParameters& params,
const base::SharedMemoryHandle handle,
const base::SyncSocket::TransitDescriptor socket);
void ResetAudioSink();
int GetOrCreateIDForHandle(const blink::WebSpeechRecognitionHandle& handle);
bool HandleExists(const blink::WebSpeechRecognitionHandle& handle);
const blink::WebSpeechRecognitionHandle& GetHandleFromID(int handle_id);
// The WebKit client class that we use to send events back to the JS world.
blink::WebSpeechRecognizerClient* recognizer_client_;
#if defined(ENABLE_WEBRTC)
// Media stream audio track that the speech recognition connects to.
// Accessed on the render thread.
blink::WebMediaStreamTrack audio_track_;
// Audio sink used to provide audio from the track.
scoped_ptr<SpeechRecognitionAudioSink> speech_audio_sink_;
#endif
typedef std::map<int, blink::WebSpeechRecognitionHandle> HandleMap;
HandleMap handle_map_;
int next_id_;
DISALLOW_COPY_AND_ASSIGN(SpeechRecognitionDispatcher);
};
} // namespace content
#endif // CONTENT_RENDERER_SPEECH_RECOGNITION_DISPATCHER_H_
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