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3、d all Notice of Disclaimer or that a certain course of action is preferred but not necessarily required; or that (in the negative form) a certain possibility or course of action is deprecated but not prohibited. The keywords “may“ and “need not“ indicate courses of action permissible within the limi
4、ts of the document. The keyword “reserved” indicates a provision that is not defined at this time, shall not be used, and may be defined in the future. The keyword “forbidden” indicates “reserved” and in addition indicates that the provision will never be defined in the future. A conformant implemen
5、tation according to this document is one that includes all mandatory provisions (“shall“) and, if implemented, all recommended provisions (“should“) as described. A conformant implementation need not implement optional provisions (“may“) and need not implement them as described. Unless otherwise spe
6、cified, the order of precedence of the types of normative information in this document shall be as follows: Normative prose shall be the authoritative definition; Tables shall be next; then formal languages; then figures; and then any other language forms. 3 Normative References The following standa
7、rds contain provisions which, through reference in this text, constitute provisions of this engineering document. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this engineering document are encouraged to inves
8、tigate the possibility of applying the most recent edition of the standards indicated below. SMPTE ST 377-1:2011, Material Exchange Format (MXF) File Format Specification Amendment 1:2012 to SMPTE ST 377-1:2011 SMPTE ST 2073-10:2017 Page 5 of 12 pages Amendment 2:2012 to SMPTE ST 377-1:2011 SMPTE ST
9、 379-2:2010, Material Exchange Format (MXF) MXF Constrained Generic Container SMPTE ST 2073-3:2015 VC-5 Video Essence. Part 3: Image Formats SMPTE ST 2073-4:2015 VC-5 Video Essence. Part 4: Subsampled Color Difference Components 4 Terms and Definitions For the purposes of this document, the followin
10、g terms and definitions apply. 4.1 VC-5 Image Essence Single image encoded as specified in SMPTE ST 2073-3 or SMPTE ST 2073-4. 5 Mapping VC-5 Image Essence to the MXF Constrained Generic Container 5.1 Compliance Except for custom-wrapping, this specification is compliant with both SMPTE ST 379-1 and
11、 SMPTE ST 379-2 and uses only provisions that are common to both. Custom-wrapping is specified only in SMPTE ST 379-2. Except for custom-wrapping, an essence container compliant with this specification can be used with applications that require compliance with SMPTE ST 379-1 and applications that re
12、quire compliance with SMPTE ST 379-2. 5.2 Using MXF Constrained Generic Container The VC-5 image essence shall be stored as a picture element in an MXF file as specified in SMPTE ST 377-1 using the MXF Constrained Generic Container defined in SMPTE ST 379-2. The mapping from VC-5 image essence to th
13、e MXF Constrained Generic Container shall be one of: Frame-based wrapping, Clip-based wrapping, Custom wrapping. 5.3 Essence Container Label The value of the Essence Container Label, defined in SMPTE ST 379-2, shall be as listed in Table 1. Table 1 MXF GC VC-5 Essence Container Label Essence Contain
14、er Label Symbol 06.0E.2B.34.04.01.01.0D.0D.01.03.01.02.1B.01.00 MXFGCVC5FrameWrapped 06.0E.2B.34.04.01.01.0D.0D.01.03.01.02.1B.02.00 MXFGCVC5ClipWrapped 06.0E.2B.34.04.01.01.0D.0D.01.03.01.02.1B.03.00 MXFGCVC5CustomWrapped SMPTE ST 2073-10:2017 Page 6 of 12 pages 5.4 Codec State Parameters Codec sta
15、te parameters describe the image represented by a VC-5 bitstream as described in SMPTE ST 2073-1, SMPTE ST 2073-3, and SMPTE ST 2073-4. The codec state parameters that describe the bitstreams in the MXF Generic Container and are used in this standard are listed in Table 2. Table 2 Codec state parame
16、ters and chunk elements used in this standard Codec State Parameter Description Reference ImageWidth Number of samples per row in the image SMPTE ST 2073-1 Section B.1.1 ImageHeight Number of rows of samples in the image SMPTE ST 2073-1 Section B.1.2 ImageFormat Format of the image SMPTE ST 2073-3 S
17、ection A.2.4 ChannelCount Number of component arrays SMPTE ST 2073-1 Section B.1.4 BitsPerComponent Number of bits in the values in a component array SMPTE ST 2073-1 Section B.1.3 PatternWidth Number of samples per row in a pattern element SMPTE ST 2073-3 Section A.2.1 PatternHeight Number of rows o
18、f samples in a pattern element SMPTE ST 2073-3 Section A.2.2 ComponentsPerSample Number of component values in a sample SMPTE ST 2073-3 Section A.2.3 MaxBitsPerComponent Upper bound on the value of BitsPerComponent for all component arrays SMPTE ST 2073-3 Section A.2.5 AlphaSampling Indicates whethe
19、r the color difference component in a YC1C2(A) image is subsampled SMPTE ST 2073-4 Section A.2.1 Inverse Component Transform Chunk Inverse affine transform that inverts the transform applied to the color components SMPTE ST 2073-3 Section 11.1.3 Inverse Component Permutation Chunk Inverse permutatio
20、n that restores the components to the same order as in the source image SMPTE ST 2073-3 Section 11.1.4 SMPTE ST 2073-10:2017 Page 7 of 12 pages 6 KLV Encoding of the VC-5 Image Essence 6.1 Picture Element Coding The picture element coding shall be as defined in SMPTE ST 379-2. 6.2 Picture Essence El
21、ement The value of the Picture Essence Element Key shall be as defined in Table 3 where byte 14 shall be the Essence Element Count (SMPTE ST 379-2) and byte 16 shall be the Essence Element Number (SMPTE ST 379-2). The track number for the picture element shall be derived from the key as defined in S
22、MPTE ST 379-2. Table 3 VC-5 Picture Essence Element Key Essence Element Key Name 06.0E.2B.34.01.02.01.01.0D.01.03.01.15.cc.14.nn Frame-wrapped VC-5 Picture Element 06.0E.2B.34.01.02.01.01.0D.01.03.01.15.cc.15.nn Clip-wrapped VC-5 Picture Element 06.0E.2B.34.01.02.01.01.0D.01.03.01.15.cc.16.nn Custom
23、-wrapped VC-5 Picture Element 6.3 Picture Element Value The value field shall consist of at least one picture element. Each picture element shall be encoded as VC-5 image essence. The presence and values of the VC-5 codec state parameters listed in Table 2 shall be constant for all VC-5 image essenc
24、e elements in the same track. Note: The VC-5 inverse component transform and the VC-5 inverse component permutation can be implicitly specified as default values. The picture element length may be constant or variable within the essence container. 7 Picture Essence Descriptors 7.1 Picture Essence Ca
25、ses Depending on the value of the ImageFormat codec state parameter, the VC-5 image essence can be described using the RGBA Picture Essence Descriptor, CDCI Picture Essence Descriptor, or Generic Picture Essence Descriptor as defined in SMPTE ST 377-1. The mapping between the ImageFormat codec state
26、 parameter in the VC-5 image essence and the picture essence descriptor for the VC-5 image essence shall be as follows: SMPTE ST 2073-10:2017 Page 8 of 12 pages 1. If the ImageFormat codec state parameter is 1, then the picture essence descriptor shall be the RGBA Picture Essence Descriptor. 2. If t
27、he ImageFormat codec state parameter is 2, then: a. The picture essence descriptor shall be the CDCI Picture Essence Descriptor and b. If the ChannelCount codec state parameter is equal to 4, then the VC-5 CDCI Picture Essence SubDescriptor shall be present. 3. If the ImageFormat codec state paramet
28、er is 3, then the picture essence descriptor shall be the Generic Picture Essence Descriptor and the VC-5 Bayer Picture Essence SubDescriptor shall be present. 4. Any other value for the ImageFormat codec state parameter is out of scope. Note: The picture essence descriptor describes the stored imag
29、e. The format of the image returned by the decoder can differ significantly from the stored image described by the picture essence descriptor. 7.2 Frame Layout The Frame Layout is an item in the Generic Picture Descriptor. The Frame Layout shall be 0. Note: Frame Layout equal to 0 is full frame. 7.3
30、 Picture Essence Coding Label The value for the Picture Essence Coding Label as defined in SMPTE ST 377-1 shall be as listed in Table 4. Note: The Picture Essence Coding label indicates the type of image format encoding of the VC-5 image essence. Table 4 Specification of the Picture Essence Coding L
31、abel Picture Essence Coding Label Symbol Name 06.0E.2B.34.04.01.01.0D.04.01.02.02.03.05.03.01 VC5Part3RGBAPicture VC-5 Part 3 RGB(A) Picture 06.0E.2B.34.04.01.01.0D.04.01.02.02.03.05.03.02 VC5Part3YCCAPicture VC-5 Part 3 YCC(A) Picture 06.0E.2B.34.04.01.01.0D.04.01.02.02.03.05.03.03 VC5Part3BayerPic
32、ture VC-5 Part 3 Bayer Picture 06.0E.2B.34.04.01.01.0D.04.01.02.02.03.05.04.02 VC5Part4YCCAPicture VC-5 Part 4 YCC(A) Picture Note : The values for byte 14 in Table 4 correspond to the SMPTE ST 2073 part number (3 or 4), and the values for byte 16 in Table 4 correspond to the values of the ImageForm
33、at codec state parameter as defined in SMPTE ST 2073-3. Note: SMPTE ST 2073-4 only supports the YC1C2(A) essence image format. SMPTE ST 2073-10:2017 Page 9 of 12 pages The correspondence between the Picture Essence Coding Label and the VC-5 essence as defined in SMPTE ST 2073-3 and ST 2073-4 shall b
34、e as listed in Table 5. Table 5 Correspondence between the symbol for the Picture Essence Coding Label and the VC-5 Image Format Symbol VC-5 Image Format VC5Part3RGBAPicture VC-5 Part 3 RGB(A) Picture VC5Part3YCCAPicture VC-5 Part 3 YC1C2(A) Picture VC5Part3BayerPicture VC-5 Part 3 Bayer Picture VC5
35、Part4YCCAPicture VC-5 Part 4 YC1C2(A) Picture 7.4 VC5CDCIPictureEssenceSubDescriptor The subdescriptor referred to by the symbol VC5CDCIPictureEssenceSubDescriptor shall be a subclass of SubDescriptor. This subdescriptor shall be referenced in the SubDescriptors item of the Descriptor as specified i
36、n SMPTE ST 377-1. The SubDescriptors item, an array of strong references, is inherited from and defined in the Generic Descriptor. The value of the VC5CDCIPictureEssenceSubDescriptor key shall be 06.0E.2B.34.02.53.01.01.0D.01.01.01.01.01.77.00, where byte 6 is as defined in SMPTE ST 377-1. Note: VC-
37、5 YC1C2(A) image essence with subsampled color difference components can have an alpha channel that is same size as the luma array or the same size as either color difference component array. VC5CDCIPictureEssenceSubDescriptor shall include the elements defined in Table 6 in addition to the elements
38、 inherited from SubDescriptor. Table 6 Items in VC5CDCIPictureEssenceSubDescriptor Item Name Type Len Item UL Req? Meaning Default VC-5 Alpha Sampling UInt16 2 06.0E.2B.34 01.01.01.0E 04.01.06.08 01.00.00.00 Req VC-5 AlphaSampling codec state parameter defined in SMPTE ST 2073-4 Note: The subdescrip
39、tor conveys color component siting metadata for VC-5 essence that has color difference components (SMPTE ST 2073-4) as described in SMPTE ST 377-1 Annexes F.4.2 and G.2.29. Note: The symbol for VC-5 Alpha Sampling is VC5AlphaSampling. 7.5 VC5BayerPictureEssenceSubDescriptor The subdescriptor referre
40、d to by the symbol VC5BayerPictureEssenceSubDescriptor shall be a subclass of SubDescriptor. This subdescriptor shall be referenced in the SubDescriptors item of the Descriptor as specified in SMPTE ST 377-1. The SubDescriptors item, an array of strong references, is inherited from and defined in th
41、e Generic Descriptor. SMPTE ST 2073-10:2017 Page 10 of 12 pages The value of the VC5BayerPictureEssenceSubDescriptor key shall be 06.0E.2B.34.02.53.01.01.0D.01.01.01.01.01.76.00, where byte 6 is as defined in SMPTE ST 377-1. VC5BayerPictureEssenceSubDescriptor shall include the elements defined in T
42、able 7 in addition to the elements inherited from SubDescriptor. Table 7 Items in VC5BayerPictureEssenceSubDescriptor Item Name Type Len Item UL Req? Meaning Default VC-5 Bayer Component Pattern RGBALayout 16 06.0E.2B.34 01.01.01.0E 04.01.06.08 02.00.00.00 Req Bayer component order and bit depth of
43、each component (See SMPTE ST 377-1) VC-5 Bayer Component Black Level UInt32 4 06.0E.2B.34 01.01.01.0E 04.01.06.08 03.00.00.00 Opt Value of each Bayer component that corresponds to black 0 VC-5 Bayer Component White Level UInt32 4 06.0E.2B.34 01.01.01.0E 04.01.06.08 04.00.00.00 Opt Value of each Baye
44、r component that corresponds to the white clipping point 4095 The VC-5 Bayer Component Pattern shall describe the Bayer pattern in raster-scan order. Example: R, 12, G, 12, G, 12, B, 12, 0, 0, 0, 0, 0, 0, 0, 0. Note: As there are two G elements in a Bayer pattern, the VC-5 Bayer Component Pattern co
45、ntains two instances of G. In the VC-5 standards, the first G component is G1 and the second G component is G2. Note: The symbols for the individual items are VC5BayerComponentPattern, VC5BayerComponentBlackLevel, and VC5BayerComponentWhiteLevel, respectively. SMPTE ST 2073-10:2017 Page 11 of 12 pag
46、es Annex A Application Notes (Informative) A.1 VC-5 Codec Standards A VC-5 bitstream encodes a single image as specified in SMPTE ST 2073-1. A VC-5 bitstream can represent any image that corresponds to an ordered set of component arrays with values that are integers with precision in the range 8-24
47、bits. SMPTE ST 2073-3 specifies how common image formats are represented as VC-5 bitstreams. Image formats that are in scope for SMPTE ST 2073-3 are RGB(A), YC1C2(A), Bayer, and generic Color Filter Array (CFA). SMPTE ST 2073-4 extends SMPTE ST 2073-3 to specify how subsampled color difference compo
48、nents in YC1C2(A) images are represented as VC-5 bitstreams. A.2 Populating the Picture Essence Descriptors The parameters that describe characteristics of the encoded image, such as the width and height, are called codec state parameters. Codec state parameters can be represented explicitly in the
49、VC-5 bitstream. If omitted from the VC-5 bitstream, items in the MXF picture descriptors can provide values for the codec state parameters. The correspondence between items in the Picture Essence Descriptors and the VC-5 codec state parameters are listed in Table A.1. Table A.1 Mapping between VC-5 Codec State Parameters and Picture Essence Descriptor items Codec State Parameter Picture Essence Descriptor Item ImageWidth Stored Width ImageHeight Stored Height Image
