1 files changed, 145 insertions, 0 deletions
diff --git a/src/atom_tkhd.cpp b/src/atom_tkhd.cpp
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+++ b/src/atom_tkhd.cpp
@@ -0,0 +1,145 @@
+/*
+ * 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 "src/impl.h"
+
+namespace mp4v2 {
+namespace impl {
+
+///////////////////////////////////////////////////////////////////////////////
+
+MP4TkhdAtom::MP4TkhdAtom()
+        : MP4Atom("tkhd")
+{
+    AddVersionAndFlags();
+}
+
+void MP4TkhdAtom::AddProperties(uint8_t version)
+{
+    if (version == 1) {
+        AddProperty( /* 2 */
+            new MP4Integer64Property("creationTime"));
+        AddProperty( /* 3 */
+            new MP4Integer64Property("modificationTime"));
+    } else { // version == 0
+        AddProperty( /* 2 */
+            new MP4Integer32Property("creationTime"));
+        AddProperty( /* 3 */
+            new MP4Integer32Property("modificationTime"));
+    }
+
+    AddProperty( /* 4 */
+        new MP4Integer32Property("trackId"));
+    AddReserved("reserved1", 4); /* 5 */
+
+    if (version == 1) {
+        AddProperty( /* 6 */
+            new MP4Integer64Property("duration"));
+    } else {
+        AddProperty( /* 6 */
+            new MP4Integer32Property("duration"));
+    }
+
+    AddReserved("reserved2", 8); /* 7 */
+
+    AddProperty( /* 8 */
+        new MP4Integer16Property("layer"));
+    AddProperty( /* 9 */
+        new MP4Integer16Property("alternate_group"));
+
+    MP4Float32Property* pProp;
+
+    pProp = new MP4Float32Property("volume");
+    pProp->SetFixed16Format();
+    AddProperty(pProp); /* 10 */
+
+    AddReserved("reserved3", 2); /* 11 */
+
+    AddProperty(new MP4BytesProperty("matrix", 36)); /* 12 */
+
+    pProp = new MP4Float32Property("width");
+    pProp->SetFixed32Format();
+    AddProperty(pProp); /* 13 */
+
+    pProp = new MP4Float32Property("height");
+    pProp->SetFixed32Format();
+    AddProperty(pProp); /* 14 */
+}
+
+void MP4TkhdAtom::Generate()
+{
+    uint8_t version = m_pFile->Use64Bits(GetType()) ? 1 : 0;
+    SetVersion(version);
+    AddProperties(version);
+
+    MP4Atom::Generate();
+
+    // set creation and modification times
+    MP4Timestamp now = MP4GetAbsTimestamp();
+    if (version == 1) {
+        ((MP4Integer64Property*)m_pProperties[2])->SetValue(now);
+        ((MP4Integer64Property*)m_pProperties[3])->SetValue(now);
+    } else {
+        ((MP4Integer32Property*)m_pProperties[2])->SetValue(now);
+        ((MP4Integer32Property*)m_pProperties[3])->SetValue(now);
+    }
+
+    // property "matrix" has non-zero fixed values
+    // this default identity matrix indicates no transformation, i.e.
+    // 1, 0, 0
+    // 0, 1, 0
+    // 0, 0, 1
+    // see http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap4/chapter_5_section_4.html
+
+    static uint8_t matrix[36] = {
+        0x00, 0x01, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00,
+        0x00, 0x01, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00,
+        0x40, 0x00, 0x00, 0x00,
+    };
+
+    ((MP4BytesProperty*)m_pProperties[12])->
+    SetValue(matrix, sizeof(matrix));
+}
+
+void MP4TkhdAtom::Read()
+{
+    /* read atom version */
+    ReadProperties(0, 1);
+
+    /* need to create the properties based on the atom version */
+    AddProperties(GetVersion());
+
+    /* now we can read the remaining properties */
+    ReadProperties(1);
+
+    Skip(); // to end of atom
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+}
+} // namespace mp4v2::impl