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// Copyright (c) 2011 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_SPEECH_RECOGNITION_REQUEST_H_
#define CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_REQUEST_H_
#pragma once
#include <string>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "content/common/content_export.h"
#include "content/public/common/url_fetcher_delegate.h"
#include "content/common/speech_input_result.h"
#include "googleurl/src/gurl.h"
class URLFetcher;
namespace net {
class URLRequestContextGetter;
}
namespace speech_input {
// Provides a simple interface for sending recorded speech data to the server
// and get back recognition results.
class SpeechRecognitionRequest : public content::URLFetcherDelegate {
public:
// ID passed to URLFetcher::Create(). Used for testing.
CONTENT_EXPORT static int url_fetcher_id_for_tests;
// Interface for receiving callbacks from this object.
class CONTENT_EXPORT Delegate {
public:
virtual void SetRecognitionResult(const SpeechInputResult& result) = 0;
protected:
virtual ~Delegate() {}
};
// |url| is the server address to which the request wil be sent.
CONTENT_EXPORT SpeechRecognitionRequest(net::URLRequestContextGetter* context,
Delegate* delegate);
CONTENT_EXPORT virtual ~SpeechRecognitionRequest();
// Sends a new request with the given audio data, returns true if successful.
// The same object can be used to send multiple requests but only after the
// previous request has completed.
CONTENT_EXPORT void Start(const std::string& language,
const std::string& grammar,
bool filter_profanities,
const std::string& hardware_info,
const std::string& origin_url,
const std::string& content_type);
// Send a single chunk of audio immediately to the server.
CONTENT_EXPORT void UploadAudioChunk(const std::string& audio_data,
bool is_last_chunk);
CONTENT_EXPORT bool HasPendingRequest() { return url_fetcher_ != NULL; }
// content::URLFetcherDelegate methods.
virtual void OnURLFetchComplete(const content::URLFetcher* source) OVERRIDE;
private:
scoped_refptr<net::URLRequestContextGetter> url_context_;
Delegate* delegate_;
scoped_ptr<content::URLFetcher> url_fetcher_;
DISALLOW_COPY_AND_ASSIGN(SpeechRecognitionRequest);
};
// This typedef is to workaround the issue with certain versions of
// Visual Studio where it gets confused between multiple Delegate
// classes and gives a C2500 error. (I saw this error on the try bots -
// the workaround was not needed for my machine).
typedef SpeechRecognitionRequest::Delegate SpeechRecognitionRequestDelegate;
} // namespace speech_input
#endif // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_REQUEST_H_
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