VC-1 Data Structures - Revision history

Multimedia Mike: /* Macroblock */ import alternate description from original WMV9 page

2006-06-01T03:12:01Z

Macroblock: import alternate description from original WMV9 page

@@ Line 72: / Line 72: @@
 * quantizer data structure for the macroblock
 * 6 block structures
 == Intensity Compensation ==

Multimedia Mike: /* AC Coding Set */ correct acronym definition

2006-05-31T04:03:58Z

AC Coding Set: correct acronym definition

← Older revision		Revision as of 21:03, 30 May 2006
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	The SRD defines the following fields for an AC coding set:		The SRD defines the following fields for an AC coding set:
	* [[VC-1 Data Structures#VLC\|VLC table]] (vc1DEC_sVLCCode data type)		* [[VC-1 Data Structures#VLC\|VLC table]] (vc1DEC_sVLCCode data type)
	* [[VC-1 Data Structures#Run Level Data Structure\|run-~~length~~-last]] (RLL) table (vc1DEC3DH_sRunLevel data type)		* [[VC-1 Data Structures#Run Level Data Structure\|run-level-last]] (RLL) table (vc1DEC3DH_sRunLevel data type)
	* delta level byte array		* delta level byte array
	* delta run byte array		* delta run byte array
	* delta level last byte array		* delta level last byte array
	* delta run last byte array		* delta run last byte array

Multimedia Mike: mention RLL data structure

2006-05-21T23:07:08Z

mention RLL data structure

← Older revision		Revision as of 16:07, 21 May 2006
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	* framerate numerator		* framerate numerator
	* framerate denominator		* framerate denominator

			== Run Level Data Structure ==
			''SRD: vc1DEC3DH_sRunLevel''; this data structure ties together 3 bytes for run, level, and last triple, and is meant to be used as an array.

	== AC Coding Set ==		== AC Coding Set ==
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	The SRD defines the following fields for an AC coding set:		The SRD defines the following fields for an AC coding set:
	* [[VC-1 Data Structures#VLC\|VLC table]] (vc1DEC_sVLCCode data type)		* [[VC-1 Data Structures#VLC\|VLC table]] (vc1DEC_sVLCCode data type)
	* run length ~~level~~ (RLL) table (vc1DEC3DH_sRunLevel data type)		* [[VC-1 Data Structures#Run Level Data Structure\|run-length-last]] (RLL) table (vc1DEC3DH_sRunLevel data type)
	* delta level byte array		* delta level byte array
	* delta run byte array		* delta run byte array
	* delta level last byte array		* delta level last byte array
	* delta run last byte array		* delta run last byte array

Multimedia Mike: /* AC Coding Set */ wiki link

2006-05-21T22:29:24Z

AC Coding Set: wiki link

← Older revision		Revision as of 15:29, 21 May 2006
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	The SRD defines the following fields for an AC coding set:		The SRD defines the following fields for an AC coding set:
	* VLC table (vc1DEC_sVLCCode data type)		* [[VC-1 Data Structures#VLC\|VLC table]] (vc1DEC_sVLCCode data type)
	* run length level (RLL) table (vc1DEC3DH_sRunLevel data type)		* run length level (RLL) table (vc1DEC3DH_sRunLevel data type)
	* delta level byte array		* delta level byte array

Multimedia Mike: mention the data structure for an AC coding set

2006-05-21T22:12:44Z

mention the data structure for an AC coding set

← Older revision		Revision as of 15:12, 21 May 2006
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	* framerate numerator		* framerate numerator
	* framerate denominator		* framerate denominator

			== AC Coding Set ==
			''SRD: vc1DEC3DH_sACCodingSet''

			The SRD defines the following fields for an AC coding set:
			* VLC table (vc1DEC_sVLCCode data type)
			* run length level (RLL) table (vc1DEC3DH_sRunLevel data type)
			* delta level byte array
			* delta run byte array
			* delta level last byte array
			* delta run last byte array

Multimedia Mike: /* Sequence And Layer Parameters */ found out what VSTransform stands for

2006-04-30T22:57:24Z

Sequence And Layer Parameters: found out what VSTransform stands for

← Older revision		Revision as of 15:57, 30 April 2006
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	* extended differential motion vector flag		* extended differential motion vector flag
	* d-quant		* d-quant
	* VS transform flag		* variable size transform flag (VSTransform)
	* overlapped transform flag		* overlapped transform flag
	* sync marker flag		* sync marker flag

Multimedia Mike: split the enumerations into a separate page

2006-04-24T15:13:15Z

split the enumerations into a separate page

Show changes

Multimedia Mike: and yet more data structures

2006-04-24T15:07:37Z

and yet more data structures

← Older revision		Revision as of 08:07, 24 April 2006
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	* 2 scale motion vector data structures (1 forward, 1 backward)		* 2 scale motion vector data structures (1 forward, 1 backward)
	* 6 64-element arrays for rescontructing samples		* 6 64-element arrays for rescontructing samples

			== Bitstream ==
			The SRD maintains a typical bitstream data structure. It simply treats a bytestream and a sequence of bits to be read from left -> right.

			== VLC ==
			The SRD uses a simple and highly inefficient VLC lookup mechanism. A table of VLCs consists of these data structures:
			* the bit pattern of the VLC
			* the number of bits in the VLC
			* the number that the VLC represents
			The first entry of a VLC table has the following meaning:
			* bits = 0
			* length = number of codes in table
			* maximun VLC code length
			The SRD's VLC reading function marches through each entry in a table, sequentially, until it finds a bit/length pattern that matches the bits at the current position in the bitstream.

			== Bitplane ==
			A bitplane data structure is used for representing a series of bit values which represent properties of the macroblocks in a picture. The data structure has the following properties:

			== Picture Layer Parameters ==
			The SRD maintains the following information for picture layer parameters:
			* frame count
			* 2 picture types (per field?)
			* buffer fullness
			* pq index
			* per-picture quantizer mode
			* PQUANT
			* half q step
			* frame transform AC coding set index
			* frame transform AC coding set index 2
			* intra transform DC table flag
			* temporal reference frame counter
			* top field first flag
			* repeat first field flag
			* U&V sample mode flag
			* post processing mode
			* quantization step size
			* ALTPQUANT
			* interpolation data structure
			* pointer to selected motion vector VLC table
			* pointer to selected coded block patterm VLC table
			* transform type flag
			* repeat frame count
			* frame interpolation hint
			* overlapping filter mode
			* pan scan parameters data structure
			* dquant frame flag (comment: per MB quant mode)
			* bitplane for AC prediction
			* bitplane for MB skip
			* bitplane for MV type
			* bitplane for Direct MB
			* bitplane for overlap flags
			* bitplane for Forward MB
			* bitplane for FieldTX MB
			* extend horizontal differential MV flag
			* extend vertical differential MV flag
			* pointer to selected VLC table for macroblock modes
			* pointer to selected VLC table for macroblock 4 motion vector block pattern table
			* pointer to selected VLC table for macroblock 2 motion vector block pattern table
			* 2 intensity compensation data structures, for top and bottom fields

			== State ==
			The SRD maintains the following information about the overall state:
			* macroblock position data structure
			* picture data structure
			* current frame number
			* pointer to macroblock data structure
			* number of fields per frame
			* maximum number of macroblocks per frame
			* pointer to the level limits for the combination of profile & level
			* sequence layer data structure
			* picture layer parameters data structure
			* "1 if not first mode 3 escape in frame"
			* "Level code size for mode 3 escape, per frame"
			* "Run code size for mode 3 escape, per frmae"
			* zig zag table index
			* flag indicating if frame is first in stream
			* flag indicating whether bitplane coding is in use
			* number of first coded block in current macroblock
			* reference picture data structure-- this is the where the current frame will be decoded
			* motion vector history buffer
			* number of fields present in the current picture

			== Decoder Configuration ==
			The SRD maintains the following information when configuring the decoder:
			* max coded width
			* max coded height
			* highest profile supported by the decoder
			* highest level supported by the decoder
			* framerate numerator
			* framerate denominator

Multimedia Mike at 04:36, 24 April 2006

2006-04-24T04:36:25Z

@@ Line 328: / Line 328: @@
 * broken link flag
 * closed entry flag
-* refdist (???) flag
+* refdist flag (refdist refers to distance to previous reference frame)
 * frame user data present flag
 * end-of-sequence marker present flag
@@ Line 396: / Line 396: @@
 * pan scan parameters data structure
 * post processing mode

Multimedia Mike: more of the same

2006-04-24T03:24:22Z

more of the same

← Older revision		Revision as of 20:24, 23 April 2006
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	* frame user data present flag		* frame user data present flag
	* end-of-sequence marker present flag		* end-of-sequence marker present flag

			== Start Codes ==
			These are the various start codes that the SRD defines:
			* 0x0A: end of sequence
			* 0x0B: slice
			* 0x0C: field
			* 0x0D: frame header
			* 0x0E: entry point header
			* 0x0F: sequence header
			* 0x1B: user-defined slice
			* 0x1C: user-defined field
			* 0x1D: user-defined frame header
			* 0x1E: user-defined entry point header
			* 0x1F: user-defined sequence header

			== Component ==
			The SRD defines a component as a single Y, U, or V plane and associates these members with the data structure:
			* data: the raw bytes that comprise the Y, U, or V sample data
			* bytes/line, a.k.a. stride

			== Field ==
			This data structure defines all of the parameters that pertain to a particular field:
			* picture type
			* conditional overlap filter mode
			* quantization mode
			* motion vector mode
			* motion vector range
			* block transform type
			* post processing flag
			* extended X differential motion vector range
			* extended Y differential motion vector range
			* number of reference fields (either 1 or 2)
			* reference field (either last or last-but-one)
			* motion vector VLC table (0..7)
			* MB mode VLC table (0..7)
			* block pattern 2 motion vector table (0..3)
			* block pattern 4 motion vector table (0..3)
			* inter-coded block coding pattern VLC table (0..3)
			* AC coding set to use for intra-coded Y blocks (0..2)
			* AC coding set to use for all inter-coded blocks or U and V intra (0..2)
			* DC coding set (0..1)
			* rows per slice (0 = no slicing used)

			== Picture ==
			The picture is the fundamental data unit in the VC-1 coding scheme. A picture can be one of the following things:
			* a progressive frame
			* an interlaced top field
			* an interlaced bottom field
			* an interlaced frame
			The SRD maintains the following information about a picture:
			* frame number (modulo 1<<32)
			* picture format
			* Y component data structure
			* U component data structure
			* V component data structure
			* 2 field data structures
			* picture resolution index
			* top field first flag
			* repeat first field flag
			* range reduction used flag
			* frame interpolation hint flag
			* chrominance sample format flag
			* repeat frame count
			* pan scan parameters data structure
			* post processing mode