[alsa-devel] [RFC/PATCH v6 03/12] media: Entities, pads and links

[Raymond Yau]

2010/12/14 Laurent Pinchart <laurent.pinchart at ideasonboard.com>

> Hi Clemens,
>
> On Tuesday 14 December 2010 14:31:55 Clemens Ladisch wrote:
> > Laurent Pinchart wrote:
> > > On Monday 13 December 2010 17:10:51 Clemens Ladisch wrote:
> > >> TYPE_EXT describes entities that represent some interface to the
> > >> external world, TYPE_INT those that are internal to the entire device.
> > >> (I'm not sure if that distinction is very useful, but TYPE_SUBDEV
> seems
> > >> to be an even more meaningless name.)
> > >
> > > SUBDEV comes from the V4L2 world, and I agree that it might not be a
> very
> > > good name.
> > >
>

It is rather confusing since subdevice in ALSA has another specific meaning


 **** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: VT1702 Analog [VT1702 Analog]
  Subdevices: 1/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1

**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: VT1702 Analog [VT1702 Analog]
  Subdevices: 3/3
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2




>
> > >> EXT_SPEAKER also includes headphones; there might be made a case for
> > >> having those as a separate subtype.
> > >
> > > Shouldn't headphones be represented by an EXT_JACK_ANALOG ?
> >
> > Headphone jacks are jacks; there are also USB headphones.
>
> So EXT_SPEAKER are speakers not connected through a jack (USB, internal
> analog, ...) ?
>

How about internal microphone of those laptop ? ( mic array , ...)

How about those default device in HDA specification ( e.g. CD , AUX,
Telephony , Modem Line , Modem Headset)