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// Copyright 2013 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 CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_AUDIO_VIDEO_CHECKER_H_
#define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_AUDIO_VIDEO_CHECKER_H_
#include "base/basictypes.h"
#include "base/callback_forward.h"
#include "base/files/file.h"
#include "base/memory/weak_ptr.h"
#include "content/public/browser/utility_process_host_client.h"
#include "storage/browser/fileapi/copy_or_move_file_validator.h"
namespace content {
class UtilityProcessHost;
}
// Uses a utility process to validate a media file. If the callback returns
// File::FILE_OK, then the file appears to be a valid media file. This does
// not attempt to decode the entire file, which may take a considerable amount
// of time. This class may be constructed on any thread, but should run on the
// IO thread.
class SafeAudioVideoChecker : public content::UtilityProcessHostClient {
public:
// Takes responsibility for closing |file|.
SafeAudioVideoChecker(
base::File file,
const storage::CopyOrMoveFileValidator::ResultCallback& callback);
// Must be called on the IO thread.
void Start();
private:
enum State {
INITIAL_STATE,
PINGED_STATE,
STARTED_STATE,
FINISHED_STATE
};
~SafeAudioVideoChecker() override;
// Starts validation once the utility process has been started.
virtual void OnProcessStarted();
// Notification of the result from the utility process.
void OnCheckingFinished(bool valid);
// UtilityProcessHostClient implementation.
void OnProcessCrashed(int exit_code) override;
bool OnMessageReceived(const IPC::Message& message) override;
State state_;
base::File file_;
const storage::CopyOrMoveFileValidator::ResultCallback callback_;
base::WeakPtr<content::UtilityProcessHost> utility_process_host_;
DISALLOW_COPY_AND_ASSIGN(SafeAudioVideoChecker);
};
#endif // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_SAFE_AUDIO_VIDEO_CHECKER_H_
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