1 files changed, 95 insertions, 0 deletions
diff --git a/src/qtff/coding.cpp b/src/qtff/coding.cpp
new file mode 100644
index 0000000..697d8f4
--- /dev/null
+++ b/src/qtff/coding.cpp
@@ -0,0 +1,95 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+//  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 MP4v2.
+// 
+//  The Initial Developer of the Original Code is Kona Blend.
+//  Portions created by Kona Blend are Copyright (C) 2008.
+//  All Rights Reserved.
+//
+//  Contributors:
+//      Kona Blend, kona8lend@@gmail.com
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "impl.h"
+
+namespace mp4v2 { namespace impl { namespace qtff {
+
+///////////////////////////////////////////////////////////////////////////////
+
+namespace {
+    class StaticData
+    {
+    public:
+        StaticData()
+        {
+            supportedCodings.insert( "avc1" );
+            supportedCodings.insert( "mp4v" );
+        }
+
+        set<string> supportedCodings;
+    };
+
+    const StaticData STATIC_DATA;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+bool
+findCoding( MP4FileHandle file, uint16_t trackIndex, MP4Atom*& coding )
+{
+    coding = NULL;
+    MP4File& mp4 = *((MP4File*)file);
+
+    if( trackIndex == numeric_limits<uint16_t>::max() ) {
+        ostringstream xss;
+        xss << "invalid track-index: " << trackIndex;
+        throw new MP4Exception( xss );
+    }
+
+    ostringstream oss;
+    oss << "moov.trak[" << trackIndex << "].mdia.hdlr";
+    MP4Atom* hdlr = mp4.FindAtom( oss.str().c_str() );
+    if( !hdlr )
+        throw new MP4Exception( "media handler not found" );
+
+    MP4StringProperty* handlerType;
+    if( !hdlr->FindProperty( "hdlr.handlerType", (MP4Property**)&handlerType ))
+        throw new MP4Exception( "media handler type-property not found" );
+
+    const string video = "vide";
+    if( video != handlerType->GetValue() )
+        throw new MP4Exception( "video-track required" );
+
+    oss.str( "" );
+    oss.clear();
+    oss << "moov.trak[" << trackIndex << "].mdia.minf.stbl.stsd";
+    MP4Atom* stsd = mp4.FindAtom( oss.str().c_str() );
+    if( !stsd )
+        throw new MP4Exception( "media handler type-property not found" );
+
+    // find first atom which is a supported coding
+    const uint32_t atomc = stsd->GetNumberOfChildAtoms();
+    for( uint32_t i = 0; i < atomc; i++ ) {
+        MP4Atom* atom = stsd->GetChildAtom( i );
+        if( STATIC_DATA.supportedCodings.find( atom->GetType() ) == STATIC_DATA.supportedCodings.end() )
+            continue;
+        coding = atom;
+    }
+
+    return coding == NULL;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+}}} // namespace mp4v2::impl::qtff