Initial community commit

Src/external_dependencies/libmp4v2/atom_stsc.cpp

@@ -0,0 +1,78 @@
+/*
+ * 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"
+
+MP4StscAtom::MP4StscAtom() 
+	: MP4Atom("stsc")
+{
+	AddVersionAndFlags();
+
+	MP4Integer32Property* pCount = 
+		new MP4Integer32Property("entryCount"); 
+	AddProperty(pCount);
+
+	MP4TableProperty* pTable = new MP4TableProperty("entries", pCount);
+	AddProperty(pTable);
+
+	pTable->AddProperty(
+		new MP4Integer32Property("firstChunk"));
+	pTable->AddProperty(
+		new MP4Integer32Property("samplesPerChunk"));
+	pTable->AddProperty(
+		new MP4Integer32Property("sampleDescriptionIndex"));
+
+	// As an optimization we add an implicit property to this table,
+	// "firstSample" that corresponds to the first sample of the firstChunk
+	MP4Integer32Property* pSample =
+		new MP4Integer32Property("firstSample");
+	pSample->SetImplicit();
+	pTable->AddProperty(pSample);
+}
+
+void MP4StscAtom::Read() 
+{
+	// Read as usual
+	MP4Atom::Read();
+
+	// Compute the firstSample values for later use
+	u_int32_t count = 
+		((MP4Integer32Property*)m_pProperties[2])->GetValue();
+
+	MP4Integer32Property* pFirstChunk = (MP4Integer32Property*)
+		((MP4TableProperty*)m_pProperties[3])->GetProperty(0);
+	MP4Integer32Property* pSamplesPerChunk = (MP4Integer32Property*)
+		((MP4TableProperty*)m_pProperties[3])->GetProperty(1);
+	MP4Integer32Property* pFirstSample = (MP4Integer32Property*)
+		((MP4TableProperty*)m_pProperties[3])->GetProperty(3);
+
+	MP4SampleId sampleId = 1;
+
+	for (u_int32_t i = 0; i < count; i++) {
+		pFirstSample->SetValue(sampleId, i);
+
+		if (i < count - 1) {
+			sampleId +=
+				(pFirstChunk->GetValue(i+1) - pFirstChunk->GetValue(i))
+				 * pSamplesPerChunk->GetValue(i);
+		}
+	}
+}