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/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef CACHING_DATASOURCE_H_
#define CACHING_DATASOURCE_H_
#include <media/stagefright/DataSource.h>
#include <media/stagefright/MediaErrors.h>
#include <utils/threads.h>
namespace android {
class CachingDataSource : public DataSource {
public:
CachingDataSource(
const sp<DataSource> &source, size_t pageSize, int numPages);
virtual status_t initCheck() const;
virtual ssize_t readAt(off_t offset, void *data, size_t size);
protected:
virtual ~CachingDataSource();
private:
struct Page {
Page *mPrev, *mNext;
off_t mOffset;
size_t mLength;
void *mData;
};
sp<DataSource> mSource;
void *mData;
size_t mPageSize;
Page *mFirst, *mLast;
Page *allocate_page();
Mutex mLock;
CachingDataSource(const CachingDataSource &);
CachingDataSource &operator=(const CachingDataSource &);
};
} // namespace android
#endif // CACHING_DATASOURCE_H_
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