Midplayer-private-dev] CN: Add black frame detection in thumbnail, so we can get valid frame(non-blank) form the video stream as the thumbnail.

Modified and committed to atlas_3_2_0 and head branch.

Thanks a lot.

Weian

-----Original Message-----
From: Eric Hyche [mailto:[email protected]] 
Sent: 2008年7月17日 23:14
To: Chen, Weian; [email protected]
Cc: [email protected]
Subject: RE: [Midplayer-private-dev] [helix-client-dev] CR: Add black frame detection in thumbnail, so we can get valid frame(non-blank) form the video stream as the thumbnail.

Weian,

Here are my comments on this change:

+    	for (int i = 0; i < width; i++)
+    	{
+        	SAD += src [(pixNumber >> 1) + i];
+    	}
+    	for (int i = 0; i < width; i++)
+    	{
+        	SAD += src [(pixNumber >> 1) + width + i];
+    	}

This doesn't really take the middle two rows of the frame. It takes a partial row, then a full row, then another partial row.

If you really want to middle two rows, then this should be:

     UINT32 ulRowBegin = (height >> 1) * width;
     for (UINT32 i = 0; i < width * 2; i++)
     {
         SAD += src[ulRowBegin + i];
     }

Similar idea for the RGB24 and RGB32 cases.

Rest looks good.

Eric

=======================================
Eric Hyche ([email protected])
Senior Technical Lead
RealNetworks, Inc.


>-----Original Message-----
>From: [email protected] [mailto:midplayer-private-dev-
>[email protected]] On Behalf Of Chen, Weian
>Sent: Thursday, July 17, 2008 4:46 AM
>To: [email protected]
>Cc: [email protected]
>Subject: [Midplayer-private-dev] [helix-client-dev] CR: Add black frame detection in thumbnail, so we
>can get valid frame(non-blank) form the video stream as the thumbnail.
>
>Synopsis:
>
>  Add black frame detection support in thumbnail, so we can get valid frame (non-blank) form the video
>stream as the thumbnail.
>
>
>
>Overview:
>
>   Currently, we always get first key frame of a stream as the thumbnail, and many of these frames are
>black, so we can't get the needed information. Then we add black frame detection, until we get a valid
>frame then stop doing thumbnail.
>
>
>
>Files Added:
>
>  None
>
>
>
>Files Modified:
>
>  player/hxclientkit/pub/HXClientCallbacks.h
>
>  player/hxclientkit/src/platform/unix/CHXClientThumbnailUnix.cpp
>
>  player/kit/dbus-server/pub/hxplayer.h
>
>  player/kit/dbus-server/src/hxplayer.cpp
>
>  player/kit/dbus-server/src/helix-dbus-server.cpp
>
>
>
>Image Size and Heap Use impact (Client -Only):
>
>  Little
>
>
>
>Platforms and Profiles Affected:
>
>  platform:   linux-2.2-libc6-gcc32-i586
>
>  profile:      helix-client-all-defines
>
>
>
>Distribution Libraries Affected:
>
>  <libhxclient.a> <helix-dbus-server.bin>
>
>
>
>Distribution library impact and planned action:
>
>  <None>
>
>
>
>Platforms and Profiles Build Verified:
>
>  Set BIF branch  -> hxdbus_3_1_0_atlas
>
>  Set Target(s)     -> dbus_server_with_video
>
>  Set Profile        -> helix-client-all-defines
>
>  System ID        -> linux-2.2-libc6-gcc32-i586
>
>
>
>Branch:
>
>  HEAD, hxclient_3_1_0_atlas
>
>
>
>Copyright assignment: <MUST be one of the following statements >
>
>2.      Intel has signed and delivered a Joint Copyright Assignment
>
>           to RealNetworks, and received acknowledgment that the
>
>           agreement was received.
>
>
>
>Files Attached:
>
>  hxclient-nonblank-thumbnail.diff
>
>  dbus-nonblank-thumb.diff
>
>
>
>Weian
>
>



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