From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrick Shirkey Subject: Re: devices/subdevices, hw:/plughw: Date: Sat, 21 Sep 2002 02:27:42 +0900 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: <3D8B5A8E.7000709@boosthardware.com> References: <3D8B4BB5.82ACFB11@sun.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Errors-To: alsa-devel-admin@lists.sourceforge.net List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: Florian Bomers Cc: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org Florian Bomers wrote: > (I initially posted this to alsa-user without answers. Hope to get more lucky > here...) > > Hi, > > sorry for those general questions, but I wasn't able to find anything on the > archives or in the ALSA documentation. > > What is the meaning of devices vs. subdevices ? What is an example where a > device would have several subdevices, as opposed to the card having several > devices ? A card is a device. The available pcm channels are sub devices. >I want to display a list of available "ports" where the user can send > the audio generated by the program. If a device has several subdevices, would I > include them in the list, or just list the devices for each card ? > You should include the sub devices. > My program successfully lists the cards with their devices and subdevices for > hw: (i.e. snd_ctl_open("hw:0") ). However, this does not work for the plughw: > way, although from what I understood, I want to use plughw: (as it is supposed > to support automatic sample rate conversion). How do I iterate all available > plughw: "cards", devices, and subdevices? Or can I assume that if hw:0,0 exists, > that plughw:0,0 is the same card/device - and I just can't iterate available > plughw:'s directly ? > yes plughw:0,0 is the same as hw:0,0 but with automatic sample rate conversion. > Thanks! > Florian > > -- Patrick Shirkey - Boost Hardware Ltd. For the discerning hardware connoisseur Http://www.boosthardware.com Http://www.boosthardware.com/LAU/guide/ ======================================== "Um...symbol_get and symbol_put... They're kindof like does anyone remember like get_symbol and put_symbol I think we used to have..." - Rusty Russell in his talk on the module subsystem ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf