atom_tkhd.cpp
资源名称:NETVIDEO.rar [点击查看]
上传用户:sun1608
上传日期:2007-02-02
资源大小:6116k
文件大小:3k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*
- * 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"
- MP4TkhdAtom::MP4TkhdAtom()
- : MP4Atom("tkhd")
- {
- AddVersionAndFlags();
- }
- void MP4TkhdAtom::AddProperties(u_int8_t version)
- {
- if (version == 1) {
- AddProperty( /* 2 */
- new MP4Integer64Property("creationTime"));
- AddProperty( /* 3 */
- new MP4Integer64Property("modificationTime"));
- } else { // version == 0
- AddProperty( /* 2 */
- new MP4Integer32Property("creationTime"));
- AddProperty( /* 3 */
- new MP4Integer32Property("modificationTime"));
- }
- AddProperty( /* 4 */
- new MP4Integer32Property("trackId"));
- AddReserved("reserved1", 4); /* 5 */
- if (version == 1) {
- AddProperty( /* 6 */
- new MP4Integer64Property("duration"));
- } else {
- AddProperty( /* 6 */
- new MP4Integer32Property("duration"));
- }
- AddReserved("reserved2", 12); /* 7 */
- MP4Float32Property* pProp;
- pProp = new MP4Float32Property("volume");
- pProp->SetFixed16Format();
- AddProperty(pProp); /* 8 */
- AddReserved("reserved3", 38); /* 9 */
- pProp = new MP4Float32Property("width");
- pProp->SetFixed32Format();
- AddProperty(pProp); /* 10 */
- pProp = new MP4Float32Property("height");
- pProp->SetFixed32Format();
- AddProperty(pProp); /* 11 */
- }
- void MP4TkhdAtom::Generate()
- {
- u_int8_t version = m_pFile->Use64Bits() ? 1 : 0;
- SetVersion(version);
- AddProperties(version);
- MP4Atom::Generate();
- // set creation and modification times
- MP4Timestamp now = MP4GetAbsTimestamp();
- if (version == 1) {
- ((MP4Integer64Property*)m_pProperties[2])->SetValue(now);
- ((MP4Integer64Property*)m_pProperties[3])->SetValue(now);
- } else {
- ((MP4Integer32Property*)m_pProperties[2])->SetValue(now);
- ((MP4Integer32Property*)m_pProperties[3])->SetValue(now);
- }
- // property reserved3 has non-zero fixed values
- static u_int8_t reserved3[38] = {
- 0x00, 0x00,
- 0x00, 0x01, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x01, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00,
- 0x40, 0x00, 0x00, 0x00,
- };
- m_pProperties[9]->SetReadOnly(false);
- ((MP4BytesProperty*)m_pProperties[9])->
- SetValue(reserved3, sizeof(reserved3));
- m_pProperties[9]->SetReadOnly(true);
- }
- void MP4TkhdAtom::Read()
- {
- /* read atom version */
- ReadProperties(0, 1);
- /* need to create the properties based on the atom version */
- AddProperties(GetVersion());
- /* now we can read the remaining properties */
- ReadProperties(1);
- Skip(); // to end of atom
- }