72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
// Copyright 2014 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#ifndef MEDIA_MP4_BOX_H_
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#define MEDIA_MP4_BOX_H_
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#include "base/basictypes.h"
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#include "base/compiler_specific.h"
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#include "media/mp4/fourccs.h"
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namespace media {
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class BufferWriter;
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namespace mp4 {
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class BoxBuffer;
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class BoxReader;
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/// Defines the base ISO BMFF box objects as defined in ISO 14496-12:2012
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/// ISO BMFF section 4.2. All ISO BMFF compatible boxes inherit from either
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/// Box or FullBox.
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struct Box {
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public:
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Box();
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virtual ~Box();
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/// Parse the mp4 box.
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/// @param reader points to a BoxReader object which parses the box.
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bool Parse(BoxReader* reader);
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/// Write the box to buffer.
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/// This function calls ComputeSize internally to compute box size.
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/// @param writer points to a BufferWriter object which wraps the buffer for
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/// writing.
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void Write(BufferWriter* writer);
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/// Compute the size of this box.
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/// The calculated size will be saved in |atom_size| for later consumption.
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virtual uint32 ComputeSize() = 0;
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virtual FourCC BoxType() const = 0;
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protected:
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friend class BoxBuffer;
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/// Read/write the mp4 box from/to BoxBuffer.
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virtual bool ReadWrite(BoxBuffer* buffer);
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/// We don't support 64-bit atom sizes. 32-bit should be large enough for our
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/// current needs.
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uint32 atom_size;
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};
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/// Defines FullBox, the other base ISO BMFF box objects as defined in
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/// ISO 14496-12:2012 ISO BMFF section 4.2. All ISO BMFF compatible boxes
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/// inherit from either Box or FullBox.
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struct FullBox : Box {
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public:
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FullBox();
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virtual ~FullBox();
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uint8 version;
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uint32 flags;
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protected:
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virtual bool ReadWrite(BoxBuffer* buffer) OVERRIDE;
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};
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} // namespace mp4
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} // namespace media
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#endif // MEDIA_MP4_BOX_H_
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