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32 lines
1.4 KiB
Plaintext
32 lines
1.4 KiB
Plaintext
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The caX device associated with a CI device behaves just like any other
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caX interface. You usually use it through a library like libdvben50221
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which is part of the dvb-apps package available at linuxtv.org.
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But contrary to other hardware where the CI module is physically placed
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in the data path between the the demod and PCIe bridge, in the Digital
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Devices cards the CI module is separate hardware.
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So, you have to feed data to the CI module by writing to the secX
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(in later kernel ci0) device and read it back from the same secX device.
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The advantage is that the CI module can be used with any data coming from
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any frontend or file. The disadvantage is that the user application has to
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write/read the data to/from the module by itself.
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The sample application apps/cit.c shows how to pipe a stream through
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the CI interface. In its ouput it will show discontinuities. Those should
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only occur at the start of the program (due to old packets inside the CI
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interface hardware and the CI module itself) and when a CI module is
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inserted or removed.
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Since some users have problems using standard software which cannot use
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the CI interface in this way, there is now the redirect feature which allows
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you to tell the driver to automatically pass the data coming from one
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demod through a CI before offering it through the normal demux/dvr interface.
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But note that this is a kludge to support old software until they can
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use the new interface.
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See docs/redirect for more info.
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