ccextractor/docs/FRONTEND_COMMUNICATIONS.TXT
2014-04-12 12:41:27 +02:00

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Starting with version 0.51, ccextractor has a mode
that allows frontends and other programs know what
the current progress is as well as get information
on interesting events, such as a file being open
or video information (resolution, frame rate and
so on) being found.
The Windows GUI source code is good reference
implementation.
Usage:
Add --gui_mode_reports
to the command line as the first parameter (this
is not essential but because the mode is enabled
after this option is parsed, if there is any
event regarding the previous parameters you
would miss them).
When this option is used, ccextractor reports
progress and other information to stderr.
This does not disable stdout (the regular stuff)
reporting.
Information it sent to stderr, one line at a time.
Information lines that are supposed to be parsed
by programs starts with ###. All other lines, if
any, must be discarded. stderr is not guaranteed
to have only information lines - so do check.
After ### the data starts. Tokens are also
separated by #. The first token specified the
data type, and the rest, if any, are parameters.
The following data types are currently defined:
VERSION - Get CCExtractor version
Program
Version
Example: ###VERSION#CCExtractor#0.51
PROGRESS - Get processed percentage and current
timing
Percentage (or -1 for streaming mode)
Minutes
Seconds
Example: ###PROGRESS#45#12#34
(for 45%, 12:34)
INPUTFILECLOSED - CCExtractor closed whatever
input file it had open (which had
been reported before).
No parameters.
INPUTFILEOPEN - A new file was successfully
open for reading.
Filename
Note that the filename CAN contain
#, so don't split the line after the
first token and treat the remainder
as the filename.
Example: ###INPUTFILEOPEN#/tmp/This is # a file.mpg
MESSAGE - Something interesting happened.
Message text.
This can be anything from a fatal
error message to something merely
informative.
Example: ###MESSAGE#Timing broken in this file
VIDEOINFO - New video information found
Horizontal resolution
Vertical resolution
Aspect ratio
Framerate
Example: ###VIDEOINFO#1980#1080#16:9#29.97
SUBTITLE - New subtitle screen
Start time
End time
Line
Time is empty if it's the same of the previous
line (i.e. they're supposed to appear together).
Example: ###SUBTITLE#10:23#10:25#This is 1
###SUBTITLE###This is 2
Note that time is in MM:SS format. No milliseconds
since this is for a preview window.
Text is trimmed and there is no color or font
information, to save space.
TSPROGRAMNUMBER - A multiprogram TS was detected, but
no program was manually selected. CCExtractor will
send a list of programs so the GUI can show it to
the user for selection.
Example: ###TSPROGRAMNUMBER#3
XDSPROGRAMNAME - Program Name as received from XDS is
available.
Example:
###XDSPROGRAMNAME#Star Trek
You may receive this more than once per stream.
*** TODO : Add the rest of XDS stuff ****