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JPEGTables

Tag Info
Tag Number: 
8
Tag Type: 
Define
Tag Flash Version: 
1
Unknown SWF Tag: 
This tag is defined by the Flash documentation by Adobe
Brief Description: 

Define the tables used to compress/decompress all the SWF 1.0 JPEG images (See also DefineBitsJPEG.)

Tag Structure: 
struct swf_jpegtables {
	swf_tag			f_tag;		/* 8 */
	unsigned char		f_encoding_tables[<variable size>];
};

The JPEGTables tag is used to define the encoding tables of the JPEG images defined using the DefineBitsJPEG tag.

There can be only one JPEGTables tag in a valid SWF file. And it should be defined before any DefineBitsJPEG tag.

The content of this tag is the JPEG encoding tables defined by the 0xFF 0xDB and 0xFF 0xC4 tags. The f_encoding_tables buffed must start with 0xFF 0xD8 (SOI) and end with 0xFF 0xD9 (EOI).

Note that the player of SWF better enforces the correctness of this tag since version 8.

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