Parse::EDID(3pm) User Contributed Perl Documentation Parse::EDID(3pm)NAME
Parse::EDID - Extended display identification data (EDID) parser
DESCRIPTION
This module provides some function to parse Extended Display Identification Data binary data structures.
FUNCTIONS
parse_edid($raw_edid)
Parse the raw binary edid data, as a string, and return a corresponding data structure, as an hashref.
check_parsed_edid($edid)
Check the data structure, and return an error message if anything is wrong, an empty string otherwise.
find_edid_in_string($string)
Extract raw binary edid data from another tool text output, such as xrandr --prop.
perl v5.14.2 2012-06-21 Parse::EDID(3pm)
Check Out this Related Man Page
EDID(9) BSD Kernel Developer's Manual EDID(9)NAME
edid -- VESA Extended Display Identification Data
SYNOPSIS
#include <dev/videomode/edidvar.h>
#include <dev/videomode/edidreg.h>
int
edid_is_valid(uint8_t *data);
int
edid_parse(uint8_t *data, struct edid_info *info);
void
edid_print(struct edid_info *info);
DESCRIPTION
These functions provide support parsing the Extended Display Identification Data which describes a display device such as a monitor or flat
panel display.
The edid_is_valid() function simply tests if the EDID block in data contains valid data. This test includes a verification of the checksum,
and that valid vendor and product idenfication data is present. The data block contain at least 128 bytes.
The edid_parse() function parses the supplied data block (which again, must be at least 128 bytes), writing the relevant data into the struc-
ture pointed to by info.
The edid_print() function prints the data in the given info structure to the console device.
RETURN VALUES
The edid_is_valid() function returns 0 if the data block is valid, and EINVAL otherwise. The edid_parse() function returns zero if the data
was successfully parsed, and non-zero otherwise.
CODE REFERENCES
The EDID subsystem is implemented within the file sys/dev/videomode/edid.c.
The EDID subsystem also makes use of VESA Generalized Timing Formula located located in sys/dev/videomode/vesagtf.c and the generic videomode
database located in sys/dev/videomode/videomode.c.
EXAMPLES
The following code uses these functions to retrieve and print information about a monitor:
struct edid_info info;
i2c_tag_t tag;
char buffer[128];
...
/* initialize i2c tag... */
...
if ((ddc_read_edid(tag, buffer, 128) == 0) &&
(edid_parse(buffer, &info) == 0))
edid_print(info);
...
SEE ALSO ddc(9), iic(9)HISTORY
These routines were added in NetBSD 4.0.
AUTHORS
Garrett D'Amore <gdamore@NetBSD.org>
BSD May 11, 2006 BSD
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