66 lines
1.6 KiB
C++
66 lines
1.6 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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#include "media/formats/mp4/box.h"
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#include "base/logging.h"
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#include "media/formats/mp4/box_buffer.h"
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namespace media {
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namespace mp4 {
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Box::Box() : atom_size(0) {}
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Box::~Box() {}
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bool Box::Parse(BoxReader* reader) {
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DCHECK(reader != NULL);
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BoxBuffer buffer(reader);
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return ReadWrite(&buffer);
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}
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void Box::Write(BufferWriter* writer) {
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DCHECK(writer != NULL);
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uint32 size = ComputeSize();
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DCHECK_EQ(size, this->atom_size);
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size_t buffer_size_before_write = writer->Size();
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BoxBuffer buffer(writer);
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CHECK(ReadWrite(&buffer));
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DCHECK_EQ(this->atom_size, writer->Size() - buffer_size_before_write);
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}
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bool Box::ReadWrite(BoxBuffer* buffer) {
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if (buffer->Reading()) {
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// Skip for read mode, which is handled already in BoxReader.
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} else {
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CHECK(buffer->ReadWriteUInt32(&this->atom_size));
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FourCC fourcc = BoxType();
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CHECK(buffer->ReadWriteFourCC(&fourcc));
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}
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return true;
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}
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FullBox::FullBox() : version(0), flags(0) {}
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FullBox::~FullBox() {}
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bool FullBox::ReadWrite(BoxBuffer* buffer) {
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RCHECK(Box::ReadWrite(buffer));
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uint32 vflags;
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if (buffer->Reading()) {
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RCHECK(buffer->ReadWriteUInt32(&vflags));
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this->version = vflags >> 24;
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this->flags = vflags & 0x00FFFFFF;
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} else {
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vflags = (this->version << 24) | this->flags;
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RCHECK(buffer->ReadWriteUInt32(&vflags));
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}
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return true;
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}
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} // namespace mp4
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} // namespace media
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