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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 PREFETCHER_H_
#define PREFETCHER_H_
#include <utils/RefBase.h>
#include <utils/Vector.h>
#include <utils/threads.h>
namespace android {
struct MediaSource;
struct PrefetchedSource;
struct Prefetcher : public RefBase {
Prefetcher();
// Given an existing MediaSource returns a new MediaSource
// that will benefit from prefetching/caching the original one.
sp<MediaSource> addSource(const sp<MediaSource> &source);
int64_t getCachedDurationUs(bool *noMoreData = NULL);
// If provided (non-NULL), "continueFunc" will be called repeatedly
// while preparing and preparation will finish early if it returns
// false. In this case "-EINTR" is returned as a result.
status_t prepare(
bool (*continueFunc)(void *cookie) = NULL,
void *cookie = NULL);
protected:
virtual ~Prefetcher();
private:
Mutex mLock;
Condition mCondition;
Vector<wp<PrefetchedSource> > mSources;
android_thread_id_t mThread;
bool mDone;
bool mThreadExited;
void startThread();
void stopThread();
static int ThreadWrapper(void *me);
void threadFunc();
Prefetcher(const Prefetcher &);
Prefetcher &operator=(const Prefetcher &);
};
} // namespace android
#endif // PREFETCHER_H_
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