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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_BROWSER_SPEECH_GOOGLE_ONE_SHOT_REMOTE_ENGINE_H_
#define CONTENT_BROWSER_SPEECH_GOOGLE_ONE_SHOT_REMOTE_ENGINE_H_
#include <string>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "content/browser/speech/audio_encoder.h"
#include "content/browser/speech/speech_recognition_engine.h"
#include "content/common/content_export.h"
#include "net/url_request/url_fetcher_delegate.h"
namespace net {
class URLRequestContextGetter;
}
namespace content {
// Implements a SpeechRecognitionEngine by means of remote interaction with
// Google speech recognition webservice.
class CONTENT_EXPORT GoogleOneShotRemoteEngine
: public NON_EXPORTED_BASE(SpeechRecognitionEngine),
public net::URLFetcherDelegate {
public:
// Duration of each audio packet.
static const int kAudioPacketIntervalMs;
// ID passed to URLFetcher::Create(). Used for testing.
static int url_fetcher_id_for_tests;
explicit GoogleOneShotRemoteEngine(net::URLRequestContextGetter* context);
~GoogleOneShotRemoteEngine() override;
// SpeechRecognitionEngine methods.
void SetConfig(const SpeechRecognitionEngineConfig& config) override;
void StartRecognition() override;
void EndRecognition() override;
void TakeAudioChunk(const AudioChunk& data) override;
void AudioChunksEnded() override;
bool IsRecognitionPending() const override;
int GetDesiredAudioChunkDurationMs() const override;
// net::URLFetcherDelegate methods.
void OnURLFetchComplete(const net::URLFetcher* source) override;
private:
SpeechRecognitionEngineConfig config_;
scoped_ptr<net::URLFetcher> url_fetcher_;
scoped_refptr<net::URLRequestContextGetter> url_context_;
scoped_ptr<AudioEncoder> encoder_;
DISALLOW_COPY_AND_ASSIGN(GoogleOneShotRemoteEngine);
};
} // namespace content
#endif // CONTENT_BROWSER_SPEECH_GOOGLE_ONE_SHOT_REMOTE_ENGINE_H_
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