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/*
* Copyright (C) 2010 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 NU_CACHED_SOURCE_2_H_
#define NU_CACHED_SOURCE_2_H_
#include <media/stagefright/foundation/ABase.h>
#include <media/stagefright/foundation/AHandlerReflector.h>
#include <media/stagefright/DataSource.h>
namespace android {
struct ALooper;
struct PageCache;
struct NuCachedSource2 : public DataSource {
NuCachedSource2(const sp<DataSource> &source);
virtual status_t initCheck() const;
virtual ssize_t readAt(off64_t offset, void *data, size_t size);
virtual status_t getSize(off64_t *size);
virtual uint32_t flags();
virtual sp<DecryptHandle> DrmInitialization();
virtual void getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client);
virtual String8 getUri();
////////////////////////////////////////////////////////////////////////////
size_t cachedSize();
size_t approxDataRemaining(status_t *finalStatus);
void resumeFetchingIfNecessary();
protected:
virtual ~NuCachedSource2();
private:
friend struct AHandlerReflector<NuCachedSource2>;
enum {
kPageSize = 65536,
kHighWaterThreshold = 20 * 1024 * 1024,
kLowWaterThreshold = 4 * 1024 * 1024,
// Read data after a 15 sec timeout whether we're actively
// fetching or not.
kKeepAliveIntervalUs = 15000000,
};
enum {
kWhatFetchMore = 'fetc',
kWhatRead = 'read',
};
sp<DataSource> mSource;
sp<AHandlerReflector<NuCachedSource2> > mReflector;
sp<ALooper> mLooper;
Mutex mSerializer;
Mutex mLock;
Condition mCondition;
PageCache *mCache;
off64_t mCacheOffset;
status_t mFinalStatus;
off64_t mLastAccessPos;
sp<AMessage> mAsyncResult;
bool mFetching;
int64_t mLastFetchTimeUs;
void onMessageReceived(const sp<AMessage> &msg);
void onFetch();
void onRead(const sp<AMessage> &msg);
void fetchInternal();
ssize_t readInternal(off64_t offset, void *data, size_t size);
status_t seekInternal_l(off64_t offset);
size_t approxDataRemaining_l(status_t *finalStatus);
void restartPrefetcherIfNecessary_l(bool ignoreLowWaterThreshold = false);
DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2);
};
} // namespace android
#endif // NU_CACHED_SOURCE_2_H_
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