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57 lines
2.1 KiB
C
57 lines
2.1 KiB
C
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsString.h"
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#include "nsTArray.h"
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#ifndef MuxerOperation_h_
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#define MuxerOperation_h_
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namespace mozilla {
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/**
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* The interface for ISO box. All Boxes inherit from this interface.
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* Generate() and Write() are needed to be called to produce a complete box.
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*
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* Generate() will generate all the data structures and their size.
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*
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* Write() will write all data into muxing output stream (ISOControl actually)
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* and update the data which can't be known at Generate() (for example, the
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* offset of the video data in mp4 file).
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*
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* ISO base media format is composed of several container boxes and the contained
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* boxes. The container boxes hold a list of MuxerOperation which is implemented
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* by contained boxes. The contained boxes will be called via the list.
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* For example:
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* MovieBox (container) ---> boxes (array of MuxerOperation)
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* |---> MovieHeaderBox (full box)
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* |---> TrakBox (container)
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* |---> MovieExtendsBox (container)
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*
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* The complete box structure can be found at 14496-12 E.2 "The‘isom’brand".
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*/
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class MuxerOperation {
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MuxerOperation)
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// Generate data of this box and its contained box, and calculate box size.
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virtual nsresult Generate(uint32_t* aBoxSize) = 0;
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// Write data to stream.
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virtual nsresult Write() = 0;
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// Find the box type via its name (name is the box type defined in 14496-12;
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// for example, 'moov' is the name of MovieBox).
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// It can only look child boxes including itself and the box in the boxes
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// list if exists. It can't look parent boxes.
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virtual nsresult Find(const nsACString& aType,
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nsTArray<nsRefPtr<MuxerOperation>>& aOperations) = 0;
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virtual ~MuxerOperation() {}
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};
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}
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#endif
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