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Diffstat (limited to 'media/libstagefright/include/NuCachedSource2.h')
-rw-r--r-- | media/libstagefright/include/NuCachedSource2.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/media/libstagefright/include/NuCachedSource2.h b/media/libstagefright/include/NuCachedSource2.h new file mode 100644 index 0000000..c30f029 --- /dev/null +++ b/media/libstagefright/include/NuCachedSource2.h @@ -0,0 +1,93 @@ +/* + * 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(off_t offset, void *data, size_t size); + + virtual status_t getSize(off_t *size); + virtual uint32_t flags(); + + //////////////////////////////////////////////////////////////////////////// + + size_t cachedSize(); + size_t approxDataRemaining(bool *eos); + +protected: + virtual ~NuCachedSource2(); + +private: + friend struct AHandlerReflector<NuCachedSource2>; + + enum { + kPageSize = 16384, + kHighWaterThreshold = 3 * 1024 * 1024, + kLowWaterThreshold = 512 * 1024, + }; + + enum { + kWhatFetchMore = 'fetc', + kWhatRead = 'read', + }; + + sp<DataSource> mSource; + sp<AHandlerReflector<NuCachedSource2> > mReflector; + sp<ALooper> mLooper; + + Mutex mSerializer; + Mutex mLock; + Condition mCondition; + + PageCache *mCache; + off_t mCacheOffset; + status_t mFinalStatus; + off_t mLastAccessPos; + sp<AMessage> mAsyncResult; + bool mFetching; + + void onMessageReceived(const sp<AMessage> &msg); + void onFetch(); + void onRead(const sp<AMessage> &msg); + + void fetchInternal(); + ssize_t readInternal(off_t offset, void *data, size_t size); + status_t seekInternal_l(off_t offset); + + size_t approxDataRemaining_l(bool *eos); + void restartPrefetcherIfNecessary_l(); + + DISALLOW_EVIL_CONSTRUCTORS(NuCachedSource2); +}; + +} // namespace android + +#endif // NU_CACHED_SOURCE_2_H_ |