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Describe about get_props() properties.

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isaki 2019-06-12 13:14:31 +00:00
parent f525fbd105
commit da8ee8f6d2
1 changed files with 19 additions and 6 deletions
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25
share/man/man9/audio.9
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@ -1,4 +1,4 @@
.\" $NetBSD: audio.9,v 1.54 2019/05/09 09:35:18 wiz Exp $
.\" $NetBSD: audio.9,v 1.55 2019/06/12 13:14:31 isaki Exp $
.\"
.\" Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -496,12 +496,25 @@ which the hardware driver can then change if needed.
E.g., DMA on the ISA bus cannot exceed 65536 bytes.
It is called in the Attached or Closed phases.
.It Dv int get_props(void *hdl)
Should return the device properties; i.e., a combination of
AUDIO_PROP_xxx.
It is called at any time.
Should return the device properties in a combination of following flags:
.Pp
.Bl -tag -width AUDIO_PROP_INDEPENDENT -compact
.It Dv AUDIO_PROP_PLAYBACK
the device is capable of audio playback.
.It Dv AUDIO_PROP_CAPTURE
the device is capable of audio capture.
.It Dv AUDIO_PROP_FULLDUPLEX
the device admits full duplex operation.
Don't set it if the device is unidirectional.
.It Dv AUDIO_PROP_INDEPENDENT
the device can set the playing and recording encoding parameters
independently.
Don't set it if the device is unidirectional.
.It Dv AUDIO_PROP_MMAP
is handled in the upper layer, so new drivers should not return this property.
.El
It is called in the Attach phase.
.Pp
.Dv AUDIO_PROP_MMAP
is acceptable but obsolete, so new drivers should not return this property.
.It Dv int trigger_output(void *hdl, void *start, void *end,
.Dv "int blksize, void (*intr)(void*), void *intrarg,"
.Pp