131 lines
3.3 KiB
C++
131 lines
3.3 KiB
C++
/*
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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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MP4TkhdAtom::MP4TkhdAtom()
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: MP4Atom("tkhd")
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{
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AddVersionAndFlags();
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}
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void MP4TkhdAtom::AddProperties(u_int8_t version)
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{
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if (version == 1) {
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AddProperty( /* 2 */
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new MP4Integer64Property("creationTime"));
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AddProperty( /* 3 */
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new MP4Integer64Property("modificationTime"));
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} else { // version == 0
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AddProperty( /* 2 */
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new MP4Integer32Property("creationTime"));
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AddProperty( /* 3 */
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new MP4Integer32Property("modificationTime"));
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}
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AddProperty( /* 4 */
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new MP4Integer32Property("trackId"));
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AddReserved("reserved1", 4); /* 5 */
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if (version == 1) {
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AddProperty( /* 6 */
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new MP4Integer64Property("duration"));
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} else {
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AddProperty( /* 6 */
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new MP4Integer32Property("duration"));
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}
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AddReserved("reserved2", 12); /* 7 */
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MP4Float32Property* pProp;
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pProp = new MP4Float32Property("volume");
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pProp->SetFixed16Format();
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AddProperty(pProp); /* 8 */
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AddReserved("reserved3", 2); /* 9 */
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AddProperty(new MP4BytesProperty("matrix", 36)); /* 10 */
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pProp = new MP4Float32Property("width");
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pProp->SetFixed32Format();
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AddProperty(pProp); /* 11 */
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pProp = new MP4Float32Property("height");
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pProp->SetFixed32Format();
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AddProperty(pProp); /* 12 */
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}
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void MP4TkhdAtom::Generate()
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{
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u_int8_t version = m_pFile->Use64Bits(GetType()) ? 1 : 0;
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SetVersion(version);
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AddProperties(version);
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MP4Atom::Generate();
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// set creation and modification times
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MP4Timestamp now = MP4GetAbsTimestamp();
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if (version == 1) {
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((MP4Integer64Property*)m_pProperties[2])->SetValue(now);
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((MP4Integer64Property*)m_pProperties[3])->SetValue(now);
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} else {
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((MP4Integer32Property*)m_pProperties[2])->SetValue(now);
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((MP4Integer32Property*)m_pProperties[3])->SetValue(now);
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}
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// property "matrix" has non-zero fixed values
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// this default identity matrix indicates no transformation, i.e.
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// 1, 0, 0
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// 0, 1, 0
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// 0, 0, 1
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// see http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap4/chapter_5_section_4.html
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static u_int8_t matrix[36] = {
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0x00, 0x01, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x01, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x40, 0x00, 0x00, 0x00,
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};
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((MP4BytesProperty*)m_pProperties[10])->
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SetValue(matrix, sizeof(matrix));
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}
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void MP4TkhdAtom::Read()
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{
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/* read atom version */
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ReadProperties(0, 1);
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/* need to create the properties based on the atom version */
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AddProperties(GetVersion());
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/* now we can read the remaining properties */
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ReadProperties(1);
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Skip(); // to end of atom
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}
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