/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #ifndef MOZILLA_RESOURCEQUEUE_H_ #define MOZILLA_RESOURCEQUEUE_H_ #include "nsDeque.h" #include "MediaData.h" namespace mozilla { class ErrorResult; // A SourceBufferResource has a queue containing the data that is appended // to it. The queue holds instances of ResourceItem which is an array of the // bytes. Appending data to the SourceBufferResource pushes this onto the // queue. // Data is evicted once it reaches a size threshold. This pops the items off // the front of the queue and deletes it. If an eviction happens then the // MediaSource is notified (done in SourceBuffer::AppendData) which then // requests all SourceBuffers to evict data up to approximately the same // timepoint. struct ResourceItem { explicit ResourceItem(MediaByteBuffer* aData); size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const; RefPtr<MediaByteBuffer> mData; }; class ResourceQueue : private nsDeque { public: ResourceQueue(); // Returns the logical byte offset of the start of the data. uint64_t GetOffset(); // Returns the length of all items in the queue plus the offset. // This is the logical length of the resource. uint64_t GetLength(); // Copies aCount bytes from aOffset in the queue into aDest. void CopyData(uint64_t aOffset, uint32_t aCount, char* aDest); void AppendItem(MediaByteBuffer* aData); // Tries to evict at least aSizeToEvict from the queue up until // aOffset. Returns amount evicted. uint32_t Evict(uint64_t aOffset, uint32_t aSizeToEvict, ErrorResult& aRv); uint32_t EvictBefore(uint64_t aOffset, ErrorResult& aRv); uint32_t EvictAll(); size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const; #if defined(DEBUG) void Dump(const char* aPath); #endif private: ResourceItem* ResourceAt(uint32_t aIndex) const; // Returns the index of the resource that contains the given // logical offset. aResourceOffset will contain the offset into // the resource at the given index returned if it is not null. If // no such resource exists, returns GetSize() and aOffset is // untouched. uint32_t GetAtOffset(uint64_t aOffset, uint32_t *aResourceOffset); ResourceItem* PopFront(); // Logical length of the resource. uint64_t mLogicalLength; // Logical offset into the resource of the first element in the queue. uint64_t mOffset; }; } // namespace mozilla #endif /* MOZILLA_RESOURCEQUEUE_H_ */