SmolRTSP_JpegQtHeader Struct Reference

An RFC 2435 Quantization Table header (§3.1.8). More...

#include <jpeg.h>

Data Fields
uint8_t	mbz
	MBZ (must be zero) field, byte 0.
uint8_t	precision
	Per-table precision bitmap, byte 1.
uint16_t	length
	Total length in bytes of the quantization-table data that follows this header (bytes 2..3, big-endian).

Detailed Description

An RFC 2435 Quantization Table header (§3.1.8).

Bit layout, transmitted in network byte order:

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|      MBZ      |   Precision   |             Length            |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Field Documentation

length

uint16_t SmolRTSP_JpegQtHeader::length

Total length in bytes of the quantization-table data that follows this header (bytes 2..3, big-endian).

Two 8-bit tables = 128.

precision

uint8_t SmolRTSP_JpegQtHeader::precision

Per-table precision bitmap, byte 1.

Bit N set = table N uses 16-bit coefficients (twice the size). 0 means all tables are 8-bit, which is the baseline RFC 2435 use.

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The documentation for this struct was generated from the following file:

• include/smolrtsp/jpeg.h