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124 lines
3.1 KiB
C++
124 lines
3.1 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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MP4RootAtom::MP4RootAtom()
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: MP4Atom(NULL)
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{
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ExpectChildAtom("moov", Required, OnlyOne);
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ExpectChildAtom("ftyp", Optional, OnlyOne);
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ExpectChildAtom("mdat", Optional, Many);
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ExpectChildAtom("free", Optional, Many);
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ExpectChildAtom("skip", Optional, Many);
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ExpectChildAtom("udta", Optional, Many);
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ExpectChildAtom("moof", Optional, Many);
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}
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void MP4RootAtom::BeginWrite(bool use64)
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{
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// only call under MP4Create() control
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WriteAtomType("ftyp", OnlyOne);
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m_pChildAtoms[GetLastMdatIndex()]->BeginWrite(m_pFile->Use64Bits("mdat"));
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}
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void MP4RootAtom::Write()
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{
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// no-op
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}
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void MP4RootAtom::FinishWrite(bool use64)
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{
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// finish writing last mdat atom
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u_int32_t mdatIndex = GetLastMdatIndex();
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m_pChildAtoms[mdatIndex]->FinishWrite(m_pFile->Use64Bits("mdat"));
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// write all atoms after last mdat
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u_int32_t size = m_pChildAtoms.Size();
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for (u_int32_t i = mdatIndex + 1; i < size; i++) {
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m_pChildAtoms[i]->Write();
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}
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}
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void MP4RootAtom::BeginOptimalWrite()
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{
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WriteAtomType("ftyp", OnlyOne);
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WriteAtomType("moov", OnlyOne);
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WriteAtomType("udta", Many);
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m_pChildAtoms[GetLastMdatIndex()]->BeginWrite(m_pFile->Use64Bits("mdat"));
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}
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void MP4RootAtom::FinishOptimalWrite()
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{
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// finish writing mdat
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m_pChildAtoms[GetLastMdatIndex()]->FinishWrite(m_pFile->Use64Bits("mdat"));
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// find moov atom
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u_int32_t size = m_pChildAtoms.Size();
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MP4Atom* pMoovAtom = NULL;
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u_int32_t i;
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for (i = 0; i < size; i++) {
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if (!strcmp("moov", m_pChildAtoms[i]->GetType())) {
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pMoovAtom = m_pChildAtoms[i];
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break;
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}
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}
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ASSERT(i < size);
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ASSERT(pMoovAtom != NULL);
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// rewrite moov so that updated chunkOffsets are written to disk
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m_pFile->SetPosition(pMoovAtom->GetStart());
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u_int64_t oldSize = pMoovAtom->GetSize();
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pMoovAtom->Write();
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// sanity check
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u_int64_t newSize = pMoovAtom->GetSize();
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ASSERT(oldSize == newSize);
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}
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u_int32_t MP4RootAtom::GetLastMdatIndex()
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{
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for (int32_t i = m_pChildAtoms.Size() - 1; i >= 0; i--) {
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if (!strcmp("mdat", m_pChildAtoms[i]->GetType())) {
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return i;
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}
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}
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ASSERT(false);
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return (u_int32_t)-1;
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}
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void MP4RootAtom::WriteAtomType(const char* type, bool onlyOne)
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{
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u_int32_t size = m_pChildAtoms.Size();
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for (u_int32_t i = 0; i < size; i++) {
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if (!strcmp(type, m_pChildAtoms[i]->GetType())) {
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m_pChildAtoms[i]->Write();
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if (onlyOne) {
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break;
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}
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}
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}
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}
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