Initial community commit

Src/external_dependencies/libmp4v2/atom_rtp.cpp

@@ -0,0 +1,148 @@
+/*
+ * 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"
+
+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);
+	ASSERT(data != NULL);
+	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((u_int32_t)strlen(pSdp->GetValue()));
+	MP4Atom::Write();
+	pSdp->SetFixedLength(0);
+}
+