This is a proposal for the interface of kaa.record2. This is not implemented yet, but if we agree to make it this way I will do it. This doc does not cover how this is done in the internals of kaa.record2.
We need to support several types of devices. DVB is different than
analoge and for analog there are also ivtv based cards. Besides
devices there are sources in the internet (live streams). The stream
should be filtered (maybe I want only teletext) and we may want to
transcode it. In the end, we either save the file, stream it using RTP
or provide the stream using HTTP.
First we need to get the device. No idea what kind of device you need?
Just call get_device().
| device = kaa.record.get_device('dvb0')
Internal kaa.record will detect dvb0 as DVB device /dev/dvb/adapter0.
Other devices may be video0 (raw or ivtv autodetected) or 'web'.
Now we have a device. Based on a config we have a channel object. This
objects holds information where to find the channel on a device. First
we need to know if the device can play the channel:
| bool = device.support_channel(channel)
which should return true. If not, we can't use it. Next we want some
parts from that channel. E.g. audio and video in one stream and
teletext in another.
| video = device.get_stream(channel, 'audio,video')
| text = device.get_stream(channel, 'teletext')
We now have two 'Stream' objects. What should we do? Let's say we want
to store the video to a file.
| video.add_output('filewriter', filename='foo')
This means for DVB the file will be written as foo.ts because without
doing anything, we get a ts. For ivtv it could be .mpg. For analog
card we need to define some sort of default.
Or we add an encoder if we want:
| enc = video.add_output('encoder', video='h.264', audio='ac3', container='mkv')
| enc.set_property('vbitrate' 2000)
enc is again a 'Stream' object and we can save it with
| enc.add_output('filewriter', filename='foo')
We can add as many outputs as we like. The add_output function returns
either a 'Stream' or a 'Sink' object (names could be different). The
'Sink' objects has an unlink() function to remove later. If a 'Stream'
has no outputs and is not referenced by python anymore, it will unlink
itself.
Comments please
Dischi
--
If the opposite of pro is con, then what must be the opposite of progress?
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