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