generate qr code with c# Feature HDMV BD-J in Software

Generator QR in Software Feature HDMV BD-J

Feature HDMV BD-J
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Application types Programming logic General purpose memory size Font buffer size for text rendering Maximum sound effects buffer size Maximum graphics buffer size Graphics bit depth Text-based subtitle rendering Popup and multipage menus
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Declarative Simple 16 KBa 4 MB 2 MB 16 MB 8 bpp (Indexed)d Yes Yes
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Procedural Complex 9 MB 4 MB 5 MBb / 65 MBc 455 MBb / 615 MBc 32 bpp Yes Yes
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continues
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1The Digital Video Broadcasting Project (DVB) is a European industry consortium established in 1993 with the aim to establish a pan-European platform for digital terrestrial television The first Multimedia Home Platform (MHP) specifications were released by the DVB in June 2000
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Blu-ray Disc Demystified
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Table 65 Comparison of HDMV and BD-J Features (continued)
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HDMV BD-J
Alpha-blended graphics Overlapping alpha-blended graphics Image scaling Frame-accurate animation Resize primary video Secondary video Local storage access Network access Applications (eg menus) may persist across titles Applications (eg menus) may persist across discs
aIn the form of 4,096 32-bit general purpose registers (GPRs) bProfile 1 players cProfile 2 players
Yes No No Yes No Yese No No No No
Yes Yes Yes Yes Yes Yese Read/Write Yese Yes Yes
dHDMV graphics use an 8-bit (256-color) palette of Y'CbCr colors with 8-bit alpha eOnly available on Profile 11 and Profile 2 players
Presentation Planes
In order to present the different media types, a so-called plane model is used by both HDMV and BD-J It basically uses five independent planes to render the various media types as depicted in Figure 65 Figure 65 Blu-ray Disc Presentation Planes
Background plane Primary video plane Secondary video plane
Presentation graphics plane Interactive graphics plane
6-10
Blu-ray Disc Demystified
Application Details
These five planes are (from back to front) the background plane, the primary video plane, the secondary video plane, the presentation graphics plane, and an interactive graphics (IG) plane The presentation plane is used for subtitles and graphics However, there are subtle differences between HDMV and BD-J modes in the way these planes are used For instance, the background plane can only be used in BD-J And the IG plane will be populated by different applications either HDMV interactive graphics, or BD-J graphics, both with their own limitations It is important to understand this plane model or the final presentation of the disc may not turn out as expected As an example, if the background plane is supposed to be used to display a graphic, the video planes cannot be rendered in full screen HD resolution, as they would fully cover the background Hence, in order to use the background plane, the primary video needs to be scaled to a smaller image size Also, in the event where both primary and secondary video are displayed, the BD specification requires one of the video planes to be full-screen HD resolution As a result, to display the background plane only the primary video can be used And, since it is not possible to switch the order of planes, whenever the secondary video is scaled up to full HD resolution, it will fully cover the primary video plane Thus, applications where the secondary video plays in full-screen with the primary video in a PIP window are not possible Similarly, with the interactive graphics plane sitting on top of the subtitle plane, this means that graphics displayed in the subtitle plane may be covered by other on-screen graphics in the IG plane Bottomline, during the design of a Blu-ray Disc, the position of the various planes should be carefully considered to ensure the final presentation turns out as expected
Organizational Structure
With the BDMV format being based on the BDAV format, it does not come as a surprise that the organizational structure is very similar, as well However, the higher levels of the BDMV format allow for much more sophistication Further, this means that a disc can jump back and forth between the modes, HDMV and BD-J, to allow content interaction and to enable more flexibility Figure 66 depicts the structural organization of a BDMV disc Figure 66 Structural Organization of BDMV Content
Blu-ray Disc Demystified
6-11
Application Details
Index Table
The index table is the starting point of the disc the highest level It lists all the titles on the disc with the corresponding Movie or BD-J Objects The index table can be referenced whenever a title or a menu is to be executed Hence, it is called during initial playback of the disc, during title search, and with menu call operations
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