--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/videoeditorengine/h263decoder/src/vdeti_mpeg.cpp	Fri Jan 29 14:08:33 2010 +0200
@@ -0,0 +1,114 @@
+/*
+* Copyright (c) 2010 Ixonos Plc.
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - Initial contribution
+*
+* Contributors:
+* Ixonos Plc
+*
+* Description:  
+* Input stream type determination.
+*
+*/
+
+
+
+
+/*
+ * Includes
+ */
+
+#include "h263dConfig.h"
+
+#include "debug.h"
+#include "sync.h"
+#include "vde.h"
+#include "vdemain.h" 
+#include "mpegcons.h"
+
+#include "core.h"
+
+
+/*
+ * Functions visible outside this module
+ */
+
+/*
+ * vdeDetermineStreamType
+ *
+ * Parameters:
+ *    hInstance                  instance data
+ *
+ * Function:
+ *   This function detects the stream type, looking at the start code
+ *   (h.263 vs. MPEG-4) and sets the flag "fMPEG4" which is
+ *   used for the configuration of the decoder. 
+ *   In case of an MPEG-4 stream calls the Video Object Header and the VOL Header
+ *   decoding function to set initial parameters.
+ *
+ * Returns:
+ *    VDE_OK                     if the stream type could be detected and 
+ *                               it is supported
+ *    VDE_ERROR_HALTED           if the stream type couldn't be detected or
+ *                               the configuration is not supported
+ *    VDE_ERROR                  if unrecoverable bitbuffer error occered
+ *
+ */
+int vdeDetermineStreamType(vdeHInstance_t hInstance, CMPEG4Transcoder *hTranscoder)
+{
+   vdeInstance_t *vdeinstance = (vdeInstance_t *) hInstance;
+   bibBuffer_t *inBuffer = vdeinstance->inBuffer;
+
+   int numBitsGot,
+      bitErrorIndication = 0;
+   int16 error = 0;
+   u_int32 bits;
+
+   bits = bibShowBits(32, inBuffer, &numBitsGot, &bitErrorIndication, &error);
+   if (error)
+      return VDE_ERROR;
+
+   /* If PSC */
+   if ((bits >> 10) == 32) {
+      vdeinstance->fMPEG4 = 0;
+   } 
+
+   /* Else check for Visual Sequence, Visual Object or Video Object start code */
+   else if ((bits == MP4_VOS_START_CODE) || 
+            (bits == MP4_VO_START_CODE) ||
+            ((bits >> MP4_VID_ID_CODE_LENGTH) == MP4_VID_START_CODE) ||
+            ((bits >> MP4_VOL_ID_CODE_LENGTH) == MP4_VOL_START_CODE)) {
+
+      vdeinstance->fMPEG4 = 1;
+
+      if (vdcDecodeMPEGVolHeader(vdeinstance->vdcHInstance, inBuffer, hTranscoder) != 0)
+         return VDE_ERROR;
+
+      bits = bibShowBits(22, inBuffer, &numBitsGot, &bitErrorIndication, &error);
+      if (error)
+         return VDE_ERROR;
+
+      /* Check if H.263 PSC follows the VOL header, in which case this is 
+         MPEG-4 with short header and is decoded as H.263 */
+      if ( bits == 32 ) {
+         vdeinstance->fMPEG4 = 0;
+      }
+
+   }
+
+   /* Else no H.263 and no MPEG-4 start code detected -> let's try H.263,
+      since MPEG-4 cannot anyway be decoded without starting header */
+   else {
+      vdeinstance->fMPEG4 = 0;
+   }
+
+   return VDE_OK;
+}
+
+// End of File