<html>
<head>
<title>Blinker - Filter</title>
</head>
<body>
<h1>Blinker - Filter</h1>
<p>
The filter module filters the frames of the input stream based on their
format.
It passes all frames matching the filter criteria unmodified.
Frames not matching the filter criteria are translated to no frame
at the output.
</p>
<p>
There are different filter criteria that can be active or not. If a
criteria file is not present, it does not affect the filtering. A frame
is only forwarded if it passes all criteria. If no criteria are specified
all frames are passed.
</p>
<h2>Configuration</h2>
<p>
The configuration of the filter module with name <code>NAME</code>
is located in the <code>filters/NAME</code> subdirectory.
</p>
<h3>Input Stream</h3>
<p>
The file <code>instream</code> contains the name of the stream to
receive.
The frames received from this stream are filtered and passed to the
output stream.
</p>
<h3>Format</h3>
<p>
The file <code>format</code> describes the required format of the
stream, i.e. its dimensions, the number of channels and the color depth
on each channel.
If present, the file must contain a string
<code><width>x<height>-<channels>/<colors></code>,
e.g. <code>18x8-1/256</code> for 18 pixels width, 8 pixels height
in 256 grayscales.
</p>
<h3>Size</h3>
<p>
The file <code>size</code> describes the required size of the
stream, i.e. its dimensions.
If present, the file must contain a string
<code><width>x<height></code>,
e.g. <code>18x8</code> for 18 pixels width, 8 pixels height.
</p>
<h3>Minimum and Maximum Files</h3>
<p>
