1 =================
2 ALSA BT87x Driver
3 =================
4
5 Intro
6 =====
7
8 You might have noticed that the bt878 grabber
9 *two* PCI functions:
10 ::
11
12 $ lspci
13 [ ... ]
14 00:0a.0 Multimedia video controller: Brooktr
15 00:0a.1 Multimedia controller: Brooktree Cor
16 [ ... ]
17
18 The first does video, it is backward compatibl
19 does audio. snd-bt87x is a driver for the sec
20 driver which can be used for recording sound (
21 playback). As most TV cards come with a short
22 into your sound card's line-in you probably do
23 you want to do is just watching TV...
24
25 Some cards do not bother to connect anything t
26 the chip, and some other cards use the audio f
27 video data, so it's quite possible that audio
28 with your card.
29
30
31 Driver Status
32 =============
33
34 The driver is now stable. However, it doesn't
35 and it refuses to load for cards it doesn't kn
36
37 If the driver complains ("Unknown TV card foun
38 not load"), you can specify the ``load_all=1``
39 try to use the audio capture function of your
40 recorded data is not right, try to specify the
41 other values than the default 32000 (often it'
42
43 If you have an unknown card, please mail the I
44 <alsa-devel@alsa-project.org>, regardless of wh
45 or not, so that future versions of this driver
46
47
48 Audio modes
49 ===========
50
51 The chip knows two different modes (digital/an
52 registers two PCM devices, one for each mode.
53 the same time.
54
55
56 Digital audio mode
57 ==================
58
59 The first device (hw:X,0) gives you 16 bit ste
60 rate depends on the external source which feed
61 sound via I2S interface.
62
63
64 Analog audio mode (A/D)
65 =======================
66
67 The second device (hw:X,1) gives you 8 or 16 b
68 sample rates are between 119466 and 448000 Hz
69 that high). If you've set the CONFIG_SND_BT87
70 maximum sample rate is 1792000 Hz, but audio d
71 beyond 896000 Hz on my card.
72
73 The chip has three analog inputs. Consequentl
74 device to control these.
75
76
77 Have fun,
78
79 Clemens
80
81
82 Written by Clemens Ladisch <clemens@ladisch.de>
83 big parts copied from btaudio.txt by Gerd Knor<
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