If the process_cc_data_flag is set the cc_data_pkt's should be parsed as follows: At some future time the process_em_data_flag will indicate whether to process the em_data bit string. This layering is based on the OSI Protocol Reference Model: This section will describe the various packets, the Coding Layer and Presentation Layers are described in the remainder of this document. The standard is not clear on this, but it appears this should be in frame display order, not encoded frame order. The normal channel is a little more mellow. includes EXT1, are followed by one byte which needs to be interpreted differently. The lowest order bits are for blue, the next two for green and the highest order bits represent red. The packets are in picture order, and must be rearranged just like picture frames are. The G2 Table contains miscellaneous characters that may not be displayed in all browsers. SNAP means the window should assume full opacity immediately.
HideWindows hides all the windows specified in the 8 bit window bitmap. A set of predefined styles will be hard stored in receivers. Opacity is represented by two bits, they represent SOLID=0, FLASH=1, TRANSLUCENT=2, and TRANSPARENT=3. They are used as adresses to combine a modulation source (a fader, a knob, a mod-wheel, breath controller, or any other) and a target (a function in a sampler or synth like filter, crossfade through layers, level, or any other function). While there have been attempts to establish an agreed CEA-708 caption intentions format, there is currently no such standard protocol. word wrap, 1 bit. row lock, 1 bit. The range is 0-15. anchor ID, 4 bits. CEA-708 captions are injected into MPEG-2 video streams in the picture user data. Standard for closed captioning for ATSC digital television, Learn how and when to remove these template messages, Learn how and when to remove this template message, https://www.adobe.com/content/dam/acom/en/devnet/video/pdfs/introduction_to_closed_captions.pdf, https://ecfsapi.fcc.gov/file/6008646915.pdf, Table A7 Picture User Data Syntax6 for 5F485C53d01, https://en.wikipedia.org/w/index.php?title=CEA-708&oldid=982115978, Articles needing additional references from February 2014, All articles needing additional references, Wikipedia articles that are too technical from May 2016, Articles with multiple maintenance issues, Articles to be expanded from December 2009, Articles with empty sections from December 2009, Creative Commons Attribution-ShareAlike License, Issuing commands and appending text to windows, Breaking up individual commands and characters, DTVCC Packet assembly from cc_data Packets, cc_data Packets extracted from video frames, link format demodulated from transmission, Modified version of ANSI X3.4 Printable Character Set (ASCII), pen size, font, scripting, italics, underline, foreground color, foreground opacity, background color, background opacity, edge color, edge type, justify, print direction, scroll direction, word wrap, display effect, effect direction, effect rate. While DTV receivers can use 608 data when 708 data is not available, this functionality is not mandatory in the receiver. Once combined the Border Type has 6 valid values: NONE=0, RAISED=1, DEPRESSED=2, UNIFORM=3, SHADOW_LEFT=4, and SHADOW_RIGHT=5. Daarbij moet worden aangetekend dat bevestigingsmiddelen als onderdeel van het constructie-element behoren te worden beschouwd. There are also two special commands, the Reset and DelayCancel.
ToggleWindows hides all displayed windows, and displays all hidden windows specified in the 8 bit window bitmap. print direction, 2 bits.
Er is geen sprake van een 1 op 1 vertaling van deze begrippen, zo komt veiligheidsklasse 2 niet overeen met CC2. If the additional_data_flag is set then the ATSC_reserved_user_data will be at the tail of the packet, terminated by the bytes 0x0,0x0,0x1. The carriage of ATSC closed captions is defined in A/53, Part 4. Tabel 1 – Vergelijking Veiligheidsklassen uit NEN 6700 en Consequence Classes uit NEN-EN 1990 Veiligheidsklasse Consequence Class, a Veiligheidsklasse 4 bestond niet in NEN 6700.
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