67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
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/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is MPEG4IP.
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*
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* The Initial Developer of the Original Code is Cisco Systems Inc.
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* Portions created by Cisco Systems Inc. are
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* Copyright (C) Cisco Systems Inc. 2001. All Rights Reserved.
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*
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* Contributor(s):
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* Dave Mackie dmackie@cisco.com
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*/
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#include "mp4common.h"
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MP4HdlrAtom::MP4HdlrAtom()
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: MP4Atom("hdlr")
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{
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AddVersionAndFlags(); /* 0, 1 */
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AddReserved("reserved1", 4); /* 2 */
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MP4StringProperty* pProp = new MP4StringProperty("handlerType");
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pProp->SetFixedLength(4);
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AddProperty(pProp); /* 3 */
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AddReserved("reserved2", 12); /* 4 */
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AddProperty( /* 5 */
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new MP4StringProperty("name"));
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}
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// There is a spec incompatiblity between QT and MP4
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// QT says name field is a counted string
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// MP4 says name field is a null terminated string
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// Here we attempt to make all things work
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void MP4HdlrAtom::Read()
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{
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// read all the properties but the "name" field
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ReadProperties(0, 5);
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uint64_t pos = m_pFile->GetPosition();
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uint64_t end = GetEnd();
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if (pos == end) return;
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// take a peek at the next byte
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u_int8_t strLength;
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m_pFile->PeekBytes(&strLength, 1);
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// if the value matches the remaining atom length
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if (pos + strLength + 1 == end) {
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// read a counted string
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MP4StringProperty* pNameProp =
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(MP4StringProperty*)m_pProperties[5];
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pNameProp->SetCountedFormat(true);
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ReadProperties(5);
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pNameProp->SetCountedFormat(false);
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} else {
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// read a null terminated string
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ReadProperties(5);
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}
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Skip(); // to end of atom
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}
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