W3C home > Mailing lists > Public > public-audio@w3.org > January to March 2012

Re: getUserMedia use cases

From: Samuel Goldszmidt <samuel.goldszmidt@ircam.fr>
Date: Wed, 01 Feb 2012 10:40:58 +0100
Message-ID: <4F2908AA.4000405@ircam.fr>
To: public-audio@w3.org
(My last paragraph is 'of course' allready solved:

Le 01/02/12 10:09, Samuel Goldszmidt a écrit :
> May be we could have to distinguish two types of use cases for dealing 
> with this question ?
> * A simple website (which need one simple input and/or output).
> For those, a javascript introspection (for instance) of available 
> devices with their possibilities (can it records, plays, how many 
> audio inputs, audio output ...), and a Javascript way to select the 
> good one programatically if it meet the needs may be sufficient.
> * An advanced website, like a DAWwebsite, which need more 
> configuration process from the user to route signals, select between 
> available inputs/outputs would also need a way to list available 
> devices, and could let the user to select the one he wants to use for 
> audio(/video) processing.
> Like in old Flash files which required webcam input, and also like 
> HTML5 geolocation, t he browser could ask the user to allow the 
> detection and selection of audio(/video) input / output that are 
> available from javascript ?
> Regards,
> Samuel Goldszmidt
> Le 01/02/12 08:44, Jussi Kalliokoski a écrit :
>> I'd like to one up what Tom just said, but also share a bit of 
>> thoughts on the matter... As useful as it is to enumerate the MIDI 
>> devices, and get I/O access to them, another really useful aspect of 
>> MIDI are virtual devices. For example, if I make a virtual keyboard 
>> or a sequencer for the browser, to stream to most of the DAWs, I need 
>> a virtual device that will act as an output for my app, and an input 
>> for the DAW. In the same way, if I have native sequencer application, 
>> and I would like to stream it's output to my in-browser-DAW, I need a 
>> virtual device that will act as the input for my DAW and output for 
>> the sequencer.
>> I'm not sure how this would be achieved, but I think it applies to 
>> concepts such as webcams as well, would be pretty cool to create a 
>> virtual webcam, that streams the contents of a canvas for example, 
>> then use existing applications such as Skype to harness it. This 
>> would allow great interaction with existing applications out there. 
>> Of course, you must not forget the security aspects that come along 
>> with this, as such proxy devices would also allow some malicious 
>> transfer.
>> Jussi Kalliokoski
>> Official.fm labs
>> On Wed, Feb 1, 2012 at 2:25 AM, Tom White (MMA) <lists@midi.org 
>> <mailto:lists@midi.org>> wrote:
>>     Chris Rogers said
>>         it would be good to have an introspection API to enumerate
>>         the available audio devices for both audio input and output.
>>          A built-in microphone would be one such device.  Also
>>         commonly available is the line-in analog audio input on a
>>         laptop or desktop computer.  And, of course, any externally
>>         connected multi-channel USB or Firewire audio devices.  Some
>>         of these can present eight (or more) simultaneous audio input
>>         and output channels simultaneously.
>>         It's important to not consider audio input in isolation, but
>>         also audio output capabilities when enumerating the devices.
>>     I can't help but point out that MItDI devices (software and
>>     hardware ports) are commonly used for audible* input/output and
>>     thus would also be a candidate for enumeration...
>>     Tom White
>>     www.midi.org <http://www.midi.org>
>>     *I say "audible" instead of "audio" so there is no confusion
>>     between MIDI and audio <g>
Received on Wednesday, 1 February 2012 09:41:46 UTC

This archive was generated by hypermail 2.3.1 : Tuesday, 6 January 2015 21:49:57 UTC