зеркало из https://github.com/mozilla/gecko-dev.git
84 строки
2.1 KiB
C++
84 строки
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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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 BOX_H_
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#define BOX_H_
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#include <stdint.h>
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#include "nsTArray.h"
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#include "MediaResource.h"
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#include "mozilla/EndianUtils.h"
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#include "AtomType.h"
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#include "BufferReader.h"
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namespace mozilla {
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class ByteStream;
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class BoxContext
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{
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public:
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BoxContext(ByteStream* aSource, const MediaByteRangeSet& aByteRanges)
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: mSource(aSource), mByteRanges(aByteRanges)
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{
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}
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RefPtr<ByteStream> mSource;
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const MediaByteRangeSet& mByteRanges;
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};
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class Box
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{
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public:
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Box(BoxContext* aContext, uint64_t aOffset, const Box* aParent = nullptr);
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Box();
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bool IsAvailable() const { return !mRange.IsEmpty(); }
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uint64_t Offset() const { return mRange.mStart; }
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uint64_t Length() const { return mRange.mEnd - mRange.mStart; }
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uint64_t NextOffset() const { return mRange.mEnd; }
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const MediaByteRange& Range() const { return mRange; }
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const Box* Parent() const { return mParent; }
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bool IsType(const char* aType) const { return mType == AtomType(aType); }
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Box Next() const;
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Box FirstChild() const;
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nsTArray<uint8_t> Read() const;
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bool Read(nsTArray<uint8_t>* aDest, const MediaByteRange& aRange) const;
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static const uint64_t kMAX_BOX_READ;
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const nsTArray<uint8_t>& Header() const { return mHeader; }
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private:
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bool Contains(MediaByteRange aRange) const;
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BoxContext* mContext;
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mozilla::MediaByteRange mRange;
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uint64_t mBodyOffset;
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uint64_t mChildOffset;
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AtomType mType;
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nsTArray<uint8_t> mHeader;
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const Box* mParent;
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};
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// BoxReader takes a copy of a box contents and serves through an AutoByteReader.
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class MOZ_RAII BoxReader
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{
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public:
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explicit BoxReader(Box& aBox)
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: mBuffer(aBox.Read())
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, mReader(mBuffer.Elements(), mBuffer.Length())
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{
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}
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BufferReader* operator->() { return &mReader; }
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private:
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nsTArray<uint8_t> mBuffer;
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BufferReader mReader;
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};
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}
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#endif
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