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ALSA: doc: ReSTize Bt87x.txt
Another simple conversion from a plain text file.
Put to cards directory.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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Documentation/sound/alsa/Bt87x.txt
Documentation/sound/cards/bt87x.rst
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Documentation/sound/alsa/Bt87x.txt
Documentation/sound/cards/bt87x.rst
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=================
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ALSA BT87x Driver
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=================
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Intro
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=====
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You might have noticed that the bt878 grabber cards have actually
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_two_ PCI functions:
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*two* PCI functions:
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::
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$ lspci
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[ ... ]
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00:0a.0 Multimedia video controller: Brooktree Corporation Bt878 (rev 02)
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00:0a.1 Multimedia controller: Brooktree Corporation Bt878 (rev 02)
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[ ... ]
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$ lspci
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[ ... ]
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00:0a.0 Multimedia video controller: Brooktree Corporation Bt878 (rev 02)
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00:0a.1 Multimedia controller: Brooktree Corporation Bt878 (rev 02)
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[ ... ]
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The first does video, it is backward compatible to the bt848. The second
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does audio. snd-bt87x is a driver for the second function. It's a sound
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driver which can be used for recording sound (and _only_ recording, no
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driver which can be used for recording sound (and *only* recording, no
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playback). As most TV cards come with a short cable which can be plugged
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into your sound card's line-in you probably don't need this driver if all
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you want to do is just watching TV...
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and it refuses to load for cards it doesn't know.
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If the driver complains ("Unknown TV card found, the audio driver will
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not load"), you can specify the load_all=1 option to force the driver to
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not load"), you can specify the ``load_all=1`` option to force the driver to
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try to use the audio capture function of your card. If the frequency of
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recorded data is not right, try to specify the digital_rate option with
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recorded data is not right, try to specify the ``digital_rate`` option with
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other values than the default 32000 (often it's 44100 or 64000).
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If you have an unknown card, please mail the ID and board name to