Initial community commit

Src/external_dependencies/libmp4v2/atom_sound.cpp

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+/*
+ * 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. 2004.  All Rights Reserved.
+ * 
+ * Contributor(s): 
+ *		Bill May		wmay@cisco.com
+ */
+
+#include "mp4common.h"
+
+MP4SoundAtom::MP4SoundAtom(const char *atomid) 
+	: MP4Atom(atomid) 
+{
+	AddReserved("reserved1", 6); /* 0 */
+
+	AddProperty( /* 1 */
+		new MP4Integer16Property("dataReferenceIndex"));
+	AddProperty( /* 2 */
+		    new MP4Integer16Property("soundVersion"));
+	AddReserved( "reserved2", 6); /* 3 */
+	
+	AddProperty( /* 4 */
+		    new MP4Integer16Property("channels"));
+	AddProperty( /* 5 */
+		    new MP4Integer16Property("sampleSize"));
+	AddProperty( /* 6 */
+		    new MP4Integer16Property("packetSize"));
+	AddProperty( /* 7 */
+		    new MP4Integer32Property("timeScale"));
+
+	if (ATOMID(atomid) == ATOMID("mp4a")) {
+	  AddReserved("reserved3", 2); /* 8 */
+	  ExpectChildAtom("esds", Required, OnlyOne);
+	  ExpectChildAtom("wave", Optional, OnlyOne);
+	} else if (ATOMID(atomid) == ATOMID("alac")) {
+	  AddReserved("reserved3", 2); /* 8 */
+	  ExpectChildAtom("alac", Optional, Optional);
+	  //AddProperty( new MP4BytesProperty("alacInfo", 36));
+	}
+}
+
+void MP4SoundAtom::AddProperties (uint8_t version)
+{
+  if (version > 0) {
+    AddProperty( /* 8 */
+		new MP4Integer32Property("samplesPerPacket"));
+    AddProperty( /* 9 */
+		new MP4Integer32Property("bytesPerPacket"));
+    AddProperty( /* 10 */
+		new MP4Integer32Property("bytesPerFrame"));
+    AddProperty( /* 11 */
+		new MP4Integer32Property("bytesPerSample"));
+  }
+  if (version == 2) {
+    AddReserved("reserved4", 20);
+  }
+}
+void MP4SoundAtom::Generate()
+{
+	MP4Atom::Generate();
+
+	((MP4Integer16Property*)m_pProperties[1])->SetValue(1);
+
+	// property reserved2 has non-zero fixed values
+	((MP4Integer16Property*)m_pProperties[2])->SetValue(0);
+	static const u_int8_t reserved2[6] = {
+		0x00, 0x00, 0x00, 0x00, 
+		0x00, 0x00, 
+	};
+	m_pProperties[3]->SetReadOnly(false);
+	((MP4BytesProperty*)m_pProperties[3])->
+		SetValue(reserved2, sizeof(reserved2));
+	m_pProperties[3]->SetReadOnly(true);
+	((MP4Integer16Property*)m_pProperties[4])->SetValue(2);
+	((MP4Integer16Property*)m_pProperties[5])->SetValue(0x0010);
+	((MP4Integer16Property*)m_pProperties[6])->SetValue(0);
+
+}
+
+void MP4SoundAtom::Read()
+{
+  MP4Atom *parent = GetParentAtom();
+  if (ATOMID(parent->GetType()) != ATOMID("stsd")) {
+    // Quicktime has an interesting thing - they'll put an mp4a atom
+    // which is blank inside a wave atom, which is inside an mp4a atom
+    // we have a mp4a inside an wave inside an mp4a - delete all properties
+    m_pProperties.Delete(8);
+    m_pProperties.Delete(7);
+    m_pProperties.Delete(6);
+    m_pProperties.Delete(5);
+    m_pProperties.Delete(4);
+    m_pProperties.Delete(3);
+    m_pProperties.Delete(2);
+    m_pProperties.Delete(1);
+    m_pProperties.Delete(0);
+    if (ATOMID(GetType()) == ATOMID("alac")) {
+      AddProperty(new MP4BytesProperty("decoderConfig", m_size));
+      ReadProperties();
+    }
+    if (m_pChildAtomInfos.Size() > 0) {
+      ReadChildAtoms();
+    }
+  } else {
+    ReadProperties(0, 3); // read first 3 properties
+    AddProperties(((MP4IntegerProperty *)m_pProperties[2])->GetValue());
+    ReadProperties(3); // continue
+    if (m_pChildAtomInfos.Size() > 0) {
+      ReadChildAtoms();
+    }
+  }
+  Skip();
+}