ref: b1ad0c2767ebcf4131f5df7aeeaa369e701a71f5
dir: /common/mp4v2/atom_hdlr.cpp/
/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is MPEG4IP.
*
* The Initial Developer of the Original Code is Cisco Systems Inc.
* Portions created by Cisco Systems Inc. are
* Copyright (C) Cisco Systems Inc. 2001. All Rights Reserved.
*
* Contributor(s):
* Dave Mackie dmackie@cisco.com
*/
#include "mp4common.h"
MP4HdlrAtom::MP4HdlrAtom()
: MP4Atom("hdlr")
{
AddVersionAndFlags(); /* 0, 1 */
AddReserved("reserved1", 4); /* 2 */
MP4StringProperty* pProp = new MP4StringProperty("handlerType");
pProp->SetFixedLength(4);
AddProperty(pProp); /* 3 */
AddReserved("reserved2", 12); /* 4 */
AddProperty( /* 5 */
new MP4StringProperty("name"));
}
// There is a spec incompatiblity between QT and MP4
// QT says name field is a counted string
// MP4 says name field is a null terminated string
// Here we attempt to make all things work
void MP4HdlrAtom::Read()
{
// read all the properties but the "name" field
ReadProperties(0, 5);
uint64_t pos = m_pFile->GetPosition();
uint64_t end = GetEnd();
if (pos == end) return;
// take a peek at the next byte
u_int8_t strLength;
m_pFile->PeekBytes(&strLength, 1);
// if the value matches the remaining atom length
if (pos + strLength + 1 == end) {
// read a counted string
MP4StringProperty* pNameProp =
(MP4StringProperty*)m_pProperties[5];
pNameProp->SetCountedFormat(true);
ReadProperties(5);
pNameProp->SetCountedFormat(false);
} else {
// read a null terminated string
ReadProperties(5);
}
Skip(); // to end of atom
}