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// Copyright (c) 2010 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 MEDIA_FILTERS_FILE_DATA_SOURCE_H_
#define MEDIA_FILTERS_FILE_DATA_SOURCE_H_
#include <string>
#include "base/gtest_prod_util.h"
#include "base/lock.h"
#include "media/base/filters.h"
namespace media {
// Basic data source that treats the URL as a file path, and uses the file
// system to read data for a media pipeline.
class FileDataSource : public DataSource {
public:
FileDataSource();
virtual ~FileDataSource();
// Implementation of Filter.
virtual void Stop(FilterCallback* callback);
// Implementation of DataSource.
virtual void Initialize(const std::string& url, FilterCallback* callback);
virtual const MediaFormat& media_format();
virtual void Read(int64 position, size_t size, uint8* data,
ReadCallback* read_callback);
virtual bool GetSize(int64* size_out);
virtual bool IsStreaming();
private:
// Only allow factories and tests to create this object.
//
// TODO(scherkus): I'm getting tired of these factories getting in the way
// of my tests!!!
FRIEND_TEST_ALL_PREFIXES(FileDataSourceTest, OpenFile);
FRIEND_TEST_ALL_PREFIXES(FileDataSourceTest, ReadData);
FRIEND_TEST_ALL_PREFIXES(FileDataSourceTest, Seek);
// File handle. NULL if not initialized or an error occurs.
FILE* file_;
// Size of the file in bytes.
int64 file_size_;
// Media format handed out by the DataSource::GetMediaFormat method.
MediaFormat media_format_;
// Critical section that protects all of the DataSource methods to prevent
// a Stop from happening while in the middle of a file I/O operation.
// TODO(ralphl): Ideally this would use asynchronous I/O or we will know
// that we will block for a short period of time in reads. Otherwise, we can
// hang the pipeline Stop.
Lock lock_;
DISALLOW_COPY_AND_ASSIGN(FileDataSource);
};
} // namespace media
#endif // MEDIA_FILTERS_FILE_DATA_SOURCE_H_
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