shithub: libvpx

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Adding/Uncommenting elements for Alpha Support

Uncommenting Track elements related to BlockAdditional and adding
the new AlphaMode element as specified in the matroska spec here:
http://matroska.org/technical/specs/index.html#AlphaMode

Change-Id: I87895931e8885e4832efa74776ab1bea91a634e2

--- a/libmkv/EbmlIDs.h

+++ b/libmkv/EbmlIDs.h

@@ -67,10 +67,10 @@

   BlockGroup = 0xA0,

   Block = 0xA1,

 /* BlockVirtual = 0xA2, */

-/* BlockAdditions = 0x75A1, */

-/* BlockMore = 0xA6, */

-/* BlockAddID = 0xEE, */

-/* BlockAdditional = 0xA5, */

+  BlockAdditions = 0x75A1,

+  BlockMore = 0xA6,

+  BlockAddID = 0xEE,

+  BlockAdditional = 0xA5,

   BlockDuration = 0x9B,

 /* ReferencePriority = 0xFA, */

   ReferenceBlock = 0xFB,

@@ -100,7 +100,7 @@

   DefaultDuration = 0x23E383,

 /* TrackTimecodeScale = 0x23314F, */

 /* TrackOffset = 0x537F, */

-/* MaxBlockAdditionID = 0x55EE, */

+  MaxBlockAdditionID = 0x55EE,

   Name = 0x536E,

   Language = 0x22B59C,

   CodecID = 0x86,

@@ -120,6 +120,7 @@

   Video = 0xE0,

   FlagInterlaced = 0x9A,

   StereoMode = 0x53B8,

+  AlphaMode = 0x53C0,

   PixelWidth = 0xB0,

   PixelHeight = 0xBA,

   PixelCropBottom = 0x54AA,