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148 lines
3.8 KiB
C++
148 lines
3.8 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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MP4RtpAtom::MP4RtpAtom()
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: MP4Atom("rtp ")
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{
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// The atom type "rtp " is used in two complete unrelated ways
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// i.e. it's real two atoms with the same name
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// To handle that we need to postpone property creation until
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// we know who our parent atom is (stsd or hnti) which gives us
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// the context info we need to know who we are
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}
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void MP4RtpAtom::AddPropertiesStsdType()
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{
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AddReserved("reserved1", 6); /* 0 */
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AddProperty( /* 1 */
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new MP4Integer16Property("dataReferenceIndex"));
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AddProperty( /* 2 */
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new MP4Integer16Property("hintTrackVersion"));
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AddProperty( /* 3 */
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new MP4Integer16Property("highestCompatibleVersion"));
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AddProperty( /* 4 */
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new MP4Integer32Property("maxPacketSize"));
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ExpectChildAtom("tims", Required, OnlyOne);
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ExpectChildAtom("tsro", Optional, OnlyOne);
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ExpectChildAtom("snro", Optional, OnlyOne);
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}
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void MP4RtpAtom::AddPropertiesHntiType()
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{
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MP4StringProperty* pProp =
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new MP4StringProperty("descriptionFormat");
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pProp->SetFixedLength(4);
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AddProperty(pProp); /* 0 */
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AddProperty( /* 1 */
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new MP4StringProperty("sdpText"));
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}
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void MP4RtpAtom::Generate()
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{
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if (!strcmp(m_pParentAtom->GetType(), "stsd")) {
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AddPropertiesStsdType();
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GenerateStsdType();
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} else if (!strcmp(m_pParentAtom->GetType(), "hnti")) {
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AddPropertiesHntiType();
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GenerateHntiType();
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} else {
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VERBOSE_WARNING(m_pFile->GetVerbosity(),
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printf("Warning: rtp atom in unexpected context, can not generate"));
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}
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}
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void MP4RtpAtom::GenerateStsdType()
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{
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// generate children
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MP4Atom::Generate();
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((MP4Integer16Property*)m_pProperties[1])->SetValue(1);
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((MP4Integer16Property*)m_pProperties[2])->SetValue(1);
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((MP4Integer16Property*)m_pProperties[3])->SetValue(1);
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}
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void MP4RtpAtom::GenerateHntiType()
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{
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MP4Atom::Generate();
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((MP4StringProperty*)m_pProperties[0])->SetValue("sdp ");
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}
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void MP4RtpAtom::Read()
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{
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if (!strcmp(m_pParentAtom->GetType(), "stsd")) {
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AddPropertiesStsdType();
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ReadStsdType();
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} else if (!strcmp(m_pParentAtom->GetType(), "hnti")) {
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AddPropertiesHntiType();
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ReadHntiType();
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} else {
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VERBOSE_READ(m_pFile->GetVerbosity(),
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printf("rtp atom in unexpected context, can not read"));
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}
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Skip(); // to end of atom
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}
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void MP4RtpAtom::ReadStsdType()
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{
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MP4Atom::Read();
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}
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void MP4RtpAtom::ReadHntiType()
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{
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ReadProperties(0, 1);
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// read sdp string, length is implicit in size of atom
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u_int64_t size = GetEnd() - m_pFile->GetPosition();
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char* data = (char*)MP4Malloc(size + 1);
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ASSERT(data != NULL);
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m_pFile->ReadBytes((u_int8_t*)data, size);
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data[size] = '\0';
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((MP4StringProperty*)m_pProperties[1])->SetValue(data);
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MP4Free(data);
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}
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void MP4RtpAtom::Write()
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{
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if (!strcmp(m_pParentAtom->GetType(), "hnti")) {
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WriteHntiType();
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} else {
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MP4Atom::Write();
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}
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}
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void MP4RtpAtom::WriteHntiType()
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{
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// since length of string is implicit in size of atom
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// we need to handle this specially, and not write the terminating \0
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MP4StringProperty* pSdp = (MP4StringProperty*)m_pProperties[1];
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pSdp->SetFixedLength((u_int32_t)strlen(pSdp->GetValue()));
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MP4Atom::Write();
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pSdp->SetFixedLength(0);
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}
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