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155 lines
4.1 KiB
155 lines
4.1 KiB
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef NU_CACHED_SOURCE_2_H_
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#define NU_CACHED_SOURCE_2_H_
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#include <media/DataSource.h>
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#include <media/stagefright/foundation/ABase.h>
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#include <media/stagefright/foundation/AHandlerReflector.h>
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namespace android {
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struct ALooper;
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struct PageCache;
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struct NuCachedSource2 : public DataSource {
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static sp<NuCachedSource2> Create(
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const sp<DataSource> &source,
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const char *cacheConfig = NULL,
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bool disconnectAtHighwatermark = false);
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virtual status_t initCheck() const;
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virtual ssize_t readAt(off64_t offset, void *data, size_t size);
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virtual void close();
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virtual void disconnect();
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virtual status_t getSize(off64_t *size);
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virtual uint32_t flags();
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virtual String8 getUri();
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virtual String8 getMIMEType() const;
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virtual String8 toString() {
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return mName;
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}
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status_t getAvailableSize(off64_t offset, off64_t *size);
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////////////////////////////////////////////////////////////////////////////
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size_t cachedSize();
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size_t approxDataRemaining(status_t *finalStatus) const;
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void resumeFetchingIfNecessary();
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// The following methods are supported only if the
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// data source is HTTP-based; otherwise, ERROR_UNSUPPORTED
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// is returned.
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status_t getEstimatedBandwidthKbps(int32_t *kbps);
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status_t setCacheStatCollectFreq(int32_t freqMs);
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static void RemoveCacheSpecificHeaders(
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KeyedVector<String8, String8> *headers,
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String8 *cacheConfig,
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bool *disconnectAtHighwatermark);
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protected:
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virtual ~NuCachedSource2();
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private:
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friend struct AHandlerReflector<NuCachedSource2>;
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NuCachedSource2(
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const sp<DataSource> &source,
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const char *cacheConfig,
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bool disconnectAtHighwatermark);
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enum {
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kPageSize = 65536,
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kDefaultHighWaterThreshold = 20 * 1024 * 1024,
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kDefaultLowWaterThreshold = 4 * 1024 * 1024,
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// Read data after a 15 sec timeout whether we're actively
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// fetching or not.
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kDefaultKeepAliveIntervalUs = 15000000,
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};
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enum {
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kWhatFetchMore = 'fetc',
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kWhatRead = 'read',
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};
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enum {
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kMaxNumRetries = 10,
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};
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sp<DataSource> mSource;
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sp<AHandlerReflector<NuCachedSource2> > mReflector;
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sp<ALooper> mLooper;
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String8 mName;
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Mutex mSerializer;
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mutable Mutex mLock;
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Condition mCondition;
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PageCache *mCache;
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off64_t mCacheOffset;
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status_t mFinalStatus;
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off64_t mLastAccessPos;
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sp<AMessage> mAsyncResult;
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bool mFetching;
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bool mDisconnecting;
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int64_t mLastFetchTimeUs;
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int32_t mNumRetriesLeft;
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size_t mHighwaterThresholdBytes;
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size_t mLowwaterThresholdBytes;
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// If the keep-alive interval is 0, keep-alives are disabled.
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int64_t mKeepAliveIntervalUs;
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bool mDisconnectAtHighwatermark;
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void onMessageReceived(const sp<AMessage> &msg);
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void onFetch();
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void onRead(const sp<AMessage> &msg);
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void fetchInternal();
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ssize_t readInternal(off64_t offset, void *data, size_t size);
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status_t seekInternal_l(off64_t offset);
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size_t approxDataRemaining_l(off64_t offset, status_t *finalStatus) const;
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void restartPrefetcherIfNecessary_l(
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bool ignoreLowWaterThreshold = false, bool force = false);
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void updateCacheParamsFromSystemProperty();
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void updateCacheParamsFromString(const char *s);
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DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2);
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};
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} // namespace android
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#endif // NU_CACHED_SOURCE_2_H_
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