ref: 44c7b98d129afe60aac5bf8a688902a67623c27f
dir: /common/mp4v2/atom_rtp.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" MP4RtpAtom::MP4RtpAtom() : MP4Atom("rtp ") { // The atom type "rtp " is used in two complete unrelated ways // i.e. it's real two atoms with the same name // To handle that we need to postpone property creation until // we know who our parent atom is (stsd or hnti) which gives us // the context info we need to know who we are } void MP4RtpAtom::AddPropertiesStsdType() { AddReserved("reserved1", 6); /* 0 */ AddProperty( /* 1 */ new MP4Integer16Property("dataReferenceIndex")); AddProperty( /* 2 */ new MP4Integer16Property("hintTrackVersion")); AddProperty( /* 3 */ new MP4Integer16Property("highestCompatibleVersion")); AddProperty( /* 4 */ new MP4Integer32Property("maxPacketSize")); ExpectChildAtom("tims", Required, OnlyOne); ExpectChildAtom("tsro", Optional, OnlyOne); ExpectChildAtom("snro", Optional, OnlyOne); } void MP4RtpAtom::AddPropertiesHntiType() { MP4StringProperty* pProp = new MP4StringProperty("descriptionFormat"); pProp->SetFixedLength(4); AddProperty(pProp); /* 0 */ AddProperty( /* 1 */ new MP4StringProperty("sdpText")); } void MP4RtpAtom::Generate() { if (!strcmp(m_pParentAtom->GetType(), "stsd")) { AddPropertiesStsdType(); GenerateStsdType(); } else if (!strcmp(m_pParentAtom->GetType(), "hnti")) { AddPropertiesHntiType(); GenerateHntiType(); } else { VERBOSE_WARNING(m_pFile->GetVerbosity(), printf("Warning: rtp atom in unexpected context, can not generate")); } } void MP4RtpAtom::GenerateStsdType() { // generate children MP4Atom::Generate(); ((MP4Integer16Property*)m_pProperties[1])->SetValue(1); ((MP4Integer16Property*)m_pProperties[2])->SetValue(1); ((MP4Integer16Property*)m_pProperties[3])->SetValue(1); } void MP4RtpAtom::GenerateHntiType() { MP4Atom::Generate(); ((MP4StringProperty*)m_pProperties[0])->SetValue("sdp "); } void MP4RtpAtom::Read() { if (!strcmp(m_pParentAtom->GetType(), "stsd")) { AddPropertiesStsdType(); ReadStsdType(); } else if (!strcmp(m_pParentAtom->GetType(), "hnti")) { AddPropertiesHntiType(); ReadHntiType(); } else { VERBOSE_READ(m_pFile->GetVerbosity(), printf("rtp atom in unexpected context, can not read")); } Skip(); // to end of atom } void MP4RtpAtom::ReadStsdType() { MP4Atom::Read(); } void MP4RtpAtom::ReadHntiType() { ReadProperties(0, 1); // read sdp string, length is implicit in size of atom u_int64_t size = GetEnd() - m_pFile->GetPosition(); char* data = (char*)MP4Malloc(size + 1); m_pFile->ReadBytes((u_int8_t*)data, size); data[size] = '\0'; ((MP4StringProperty*)m_pProperties[1])->SetValue(data); MP4Free(data); } void MP4RtpAtom::Write() { if (!strcmp(m_pParentAtom->GetType(), "hnti")) { WriteHntiType(); } else { MP4Atom::Write(); } } void MP4RtpAtom::WriteHntiType() { // since length of string is implicit in size of atom // we need to handle this specially, and not write the terminating \0 MP4StringProperty* pSdp = (MP4StringProperty*)m_pProperties[1]; pSdp->SetFixedLength(strlen(pSdp->GetValue())); MP4Atom::Write(); pSdp->SetFixedLength(0); }