ref: 4041be70bf23c172dda3d107e19d84c2fb58f644
dir: /common/mp4v2/atom_mvhd.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 [email protected] */ #include "mp4common.h" MP4MvhdAtom::MP4MvhdAtom() : MP4Atom("mvhd") { AddVersionAndFlags(); } void MP4MvhdAtom::AddProperties(u_int8_t version) { if (version == 1) { AddProperty( /* 2 */ new MP4Integer64Property("creationTime")); AddProperty( /* 3 */ new MP4Integer64Property("modificationTime")); } else { AddProperty( /* 2 */ new MP4Integer32Property("creationTime")); AddProperty( /* 3 */ new MP4Integer32Property("modificationTime")); } AddProperty( /* 4 */ new MP4Integer32Property("timeScale")); if (version == 1) { AddProperty( /* 5 */ new MP4Integer64Property("duration")); } else { AddProperty( /* 5 */ new MP4Integer32Property("duration")); } MP4Float32Property* pProp; pProp = new MP4Float32Property("rate"); pProp->SetFixed32Format(); AddProperty(pProp); /* 6 */ pProp = new MP4Float32Property("volume"); pProp->SetFixed16Format(); AddProperty(pProp); /* 7 */ AddReserved("reserved1", 70); /* 8 */ AddProperty( /* 9 */ new MP4Integer32Property("nextTrackId")); } void MP4MvhdAtom::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); } ((MP4Float32Property*)m_pProperties[6])->SetValue(1.0); ((MP4Float32Property*)m_pProperties[7])->SetValue(1.0); // property reserved has non-zero fixed values static u_int8_t reserved[70] = { 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, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, }; m_pProperties[8]->SetReadOnly(false); ((MP4BytesProperty*)m_pProperties[8])-> SetValue(reserved, sizeof(reserved)); m_pProperties[8]->SetReadOnly(true); // set next track id ((MP4Integer32Property*)m_pProperties[9])->SetValue(1); } void MP4MvhdAtom::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 }