// VSIF Packet Structure (31 bytes total) typedef struct // --- Generic InfoFrame Header (3 bytes) --- uint8_t type; // 0x81 (VSIF Type) uint8_t version; // 0x01 (Version 1) uint8_t length; // Length of payload (depends on content)
With and beyond, VSIF HDMI is being extended to carry: vsif hdmi
The is a critical auxiliary data packet in the HDMI (High-Definition Multimedia Interface) specification that allows hardware manufacturers to transmit proprietary metadata not covered by standard InfoFrames . While standard packets like the AVI InfoFrame handle core video timings and color spaces, the VSIF provides the flexibility needed for advanced features like 3D video , 4K resolutions (in earlier specs), and custom vendor protocols. Understanding the VSIF Architecture // VSIF Packet Structure (31 bytes total) typedef
The VSIF has been the primary vehicle for introducing new display technologies before they are integrated into the "base" HDMI specification. AUX Packets - 3.2 English - PG235 AUX Packets - 3
| Feature | VSIF HDMI (DisplayID) | CEA-861 Vendor Specific DB | EDID 1.4 | |---------|------------------------|----------------------------|----------| | Transport | Live InfoFrame (TMDS) | EDID block (DDC) | DDC only | | Max size | 31 bytes per packet | 31 bytes total | 256 bytes | | Dynamic updates | Yes (per frame) | No (static) | No | | VRR range support | Yes (precise) | Limited (fixed few values) | No | | Tiled displays | Yes | No | No | | HDR dynamic metadata | Yes (Dolby Vision/HDR10+) | No | No |
| Offset | Field | Size | Value | |--------|-------|------|-------| | 0 | DisplayID Version | 8 bits | 0x10 (v1.0) to 0x13 (v1.3+) | | 1 | DisplayID Length | 8 bits | Total bytes of DisplayID block | | 2-n | DisplayID Data Blocks | Variable | See Section 4 |
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