- From: Joe Berkovitz <joe@noteflight.com>
- Date: Tue, 12 May 2015 09:52:58 -0400
- To: Stefan Håkansson LK <stefan.lk.hakansson@ericsson.com>
- Cc: Audio Working Group <public-audio@w3.org>
- Message-ID: <CA+ojG-bA2ezPyK8tk2q1FQ9SDWSKH6AruTgS-r3EGiLVzXgM7A@mail.gmail.com>
Thanks Stefan. The capture of my comments seems fine and I've subscribed to the list as you suggested. ...Joe On Tue, May 12, 2015 at 2:57 AM, Stefan Håkansson LK < stefan.lk.hakansson@ericsson.com> wrote: > On 30/04/15 15:37, Joe Berkovitz wrote: > > Thank you so much, Stefan. > > > > What is the best way for members of the Audio WG to track the progress > > of this issue within the Media Capture TF? > > Hi Joe, > > all LC comments are gathered at > > https://www.w3.org/2006/02/lc-comments-tracker/47318/WD-mediacapture-streams-20150414/ > - so it could make sense to check that your comments are captured there. > > We are planning for a Media Capture TF call later in May to discuss how > to deal with the comments, and the chairs plan to send a proposal to the > list before the call. Likely there will be some comments that are easy > to deal with, and some that require more discussion. > > I think that for now, the best thing for the Audio WG would be to > (assign someone to) monitor the public-media-capture list. It should be > doable, the amount of traffic is not that big. > > Best regards, > Stefan > > > > > Best regards, > > > > ...Joe > > > > > > On Wed, Apr 22, 2015 at 1:24 AM, Stefan Håkansson LK > > <stefan.lk.hakansson@ericsson.com > > <mailto:stefan.lk.hakansson@ericsson.com>> wrote: > > > > Many thanks for providing valuable feedback! > > > > On 21/04/15 20:59, Joe Berkovitz wrote: > > > Hello Stefan, > > > > > > > > > Thank you for your recent solicitation of feedback to on the Media > > > Capture and Streams API, which I passed to the Web Audio Working > Group. > > > > > > > > > The Web Audio WG so far has identified one key item that we would > like > > > to see addressed. The MediaDeviceInfo result from > enumerateDevices() > > > ( > http://www.w3.org/TR/2015/WD-mediacapture-streams-20150414/#idl-def-MediaDeviceInfo > ) > > > lacks information that is typically available in the underlying OS > > > implementations that we think would be very helpful for > implementations: > > > > > > __ __ > > > > > > __·__Channel count and configuration (Mono, Stereo, 5.1, 7.1, > > etc…)____ > > > > > > __·__Physical Output (Headphone, Speaker, HDMI, …)____ > > > > > > __·__Latency (this matters a lot for gaming -- it will be very > > low for > > > on-board hardware, perhaps quite high for wireless audio bridging > like > > > Apple TV)____ > > > > > > __·__Output capabilities (bitstream passthrough vs PCM – relevant > in > > > digital media adapter cases (Chromecast, etc))____ > > > > > > > > > It is perhaps sufficient from a user interface point of view to > have a > > > string to display, but for a program to be able to either adapt to > the > > > user selection or to guide and default the user selection, the > above are > > > pretty important characteristics, at least in some use cases. Many > if > > > not most of the host OSes that user agents run on expose these > sorts of > > > output device characteristics. ____ > > > > > > > > > Aside from the difficulty with enumerating devices, there is also > > > perhaps a need to make it possible for applications to query the > set of > > > available devices with respect to the above charateristics. > > > MediaTrackConstraints and MediaTrackSettings do not currently > include > > > constraint attributes that map to items in the above list. And > even if > > > they do, arriving at a practical goodness-of-fit metric that can be > > > generalized across a spectrum of audio apps may be difficult. > > > > > > > > > The same concerns apply to the set of input devices.__ > > > > > > __ __ > > > > > > Please let us know if this issue makes sense to the group and can > be > > > addressed within the timeframe of the coming run-up to a Last Call > WD. > > > We'd be happy to arrange some sort of inter-WG call to try to make > > > progress on this together. > > > > > > > > > Thank you! > > > > > > > > > Best regards, > > > > > > > > > Joe Berkovitz > > > > > > co-chair Web Audio WG > > > > > > > > > *Noteflight LLC* > > > Boston, Mass. > > > phone:+1 978 314 6271 <tel:%2B1%20978%20314%206271> > > > www.noteflight.com <http://www.noteflight.com> > > <http://www.noteflight.com/> > > > "Your music, everywhere" > > > > > > On Wed, Apr 15, 2015 at 1:31 AM, Stefan Håkansson LK > > > <stefan.lk.hakansson@ericsson.com > > <mailto:stefan.lk.hakansson@ericsson.com> > > > <mailto:stefan.lk.hakansson@ericsson.com > > <mailto:stefan.lk.hakansson@ericsson.com>>> wrote: > > > > > > The WebRTC and Device APIs Working Groups request feedback on > > the Last > > > Call Working Draft of Media Capture and Streams, a JavaScript > > API that > > > enables access to cameras and microphones from Web browsers > > as well as > > > control of the use of the data generated (e.g. rendering what > > a camera > > > captures in a html video element): > > > http://www.w3.org/TR/2015/WD-mediacapture-streams-20150414/ > > > > > > The groups have identified the following other W3C Working > > Groups as > > > likely sources of feedback: > > > > > > - HTML Working Group, especially the HTML Media Task Force, > > as our API > > > extends the HTMLMediaElement interface and defines a new type > > of media > > > input via MediaStream > > > > > > - WebApps Working Group, especially on the overall usage of > > Web IDL and > > > the definition of error handling > > > Audio Working Group, as the Web Audio API builds upon the > > MediaStream > > > interface > > > > > > - WAI Protocol and Formats Working Group, especially on the > > impact of > > > the user consent dialog and the applicability of the > > indicators of > > > device usage in assistive tools > > > > > > - Web and TV Interest Group, as the manipulation of media > > input can be > > > relevant to some of their use cases (e.g. glass to glass) > > > > > > - Web App Security Working Group, especially on our links > between > > > secured origins and persistent permissions, and our current > > policy with > > > regard to handling access to this "powerful feature" > > > > > > - Web Security Interest Group, especially on our security > > considerations > > > Privacy Interest Group, as access to camera and microphone > > has strong > > > privacy implications > > > > > > - Technical Architecture Group, for an overall review of the > API, > > > especially the introduction of the concept of a IANA > > registry-based > > > constraints system, the use of promises, and our handling of > > persistent > > > permissions > > > > > > We naturally also welcome feedback from any other reviewers. > > > > > > The end of last call review for this specification is set to > > May 15 > > > 2015; should that deadline prove difficult to meet, please > > get in touch > > > so that we can determine a new deadline for your group. > > > > > > As indicated in the document, comments should be sent to the > > > public-media-capture@w3.org <mailto:public-media-capture@w3.org> > > <mailto:public-media-capture@w3.org > > <mailto:public-media-capture@w3.org>> > > > mailing list. > > > > > > Thanks, > > > > > > Frederick Hirsch, Device APIs Working Group Chair, > > > Harald Alvestrand and Stefan Hakansson, WebRTC Working Group > Chairs and > > > Media Capture Task Force Chairs > > > > > > > > > > > > > > > -- > > > . . . . . ...Joe > > > > > > *Joe Berkovitz* > > > President > > > > > > *Noteflight LLC* > > > Boston, Mass. > > > phone:+1 978 314 6271 <tel:%2B1%20978%20314%206271> > > > www.noteflight.com <http://www.noteflight.com> > > <http://www.noteflight.com> > > > "Your music, everywhere" > > > > > > > > > > -- > > . . . . . ...Joe > > > > *Joe Berkovitz* > > President > > > > *Noteflight LLC* > > 49R Day Street / Somerville, MA 02144 / USA > > phone: +1 978 314 6271 > > www.noteflight.com <http://www.noteflight.com> > > "Your music, everywhere" > > -- . . . . . ...Joe *Joe Berkovitz* President *Noteflight LLC* 49R Day Street / Somerville, MA 02144 / USA phone: +1 978 314 6271 www.noteflight.com "Your music, everywhere"
Received on Tuesday, 12 May 2015 13:53:26 UTC