On Wed, Apr 16, 2014 at 8:11 PM, Shelly Lin <[email protected]> wrote:
> Hi everyone, > > I've picked up the implementation of bug 744896 to support multi-tracks > media sources from DTV. > https://bugzilla.mozilla.org/show_bug.cgi?id=744896 > > Although the Tuner API is till in draft, it is pretty solid that the > source of a tuner would be MediaStream. > http://airpingu.github.io/tv-tuner-api/index.html#idl-def-TVTuner > > The problem is that the mapping of AudioStreamTrack to AudioTrack is not > one-on-one, for example: > > An audio track has: > interface AudioTrack { > readonly attribute DOMString id; > readonly attribute DOMString kind; > --> "alternative", "descriptions", "main" > readonly attribute DOMString label; > --> more like free string for users(resource) to define > readonly attribute DOMString language; > --> "eng", "fra" > attribute boolean enabled; > }; > For AudioTrack.kind() > http://www.w3.org/TR/html5/embedded-content-0.html#dom-audiotrack-kind > For AudioTrack.language() > http://www.w3.org/TR/html5/embedded-content-0.html#dom-audiotrack-language > > An audio stream track has: > interface MediaStreamTrack : EventTarget { > readonly attribute DOMString kind; > --> "audio" or "video" > readonly attribute DOMString id; > readonly attribute DOMString label; > --> Same as the label in audio track > attribute boolean enabled; > readonly attribute boolean muted; > > Should I use Constraints to setup the information when constructing a > stream track? > > http://dev.w3.org/2011/webrtc/editor/getusermedia.html#tracks-and-constraints > > Or, if this mapping will not reveal to js anyway, is it okay to just > implement the mapping internally? Say the label attribute of > MediaStreamTrack contains a field of "kind" and a field of "language", so > that we can parse them out at constructing an audio track from media stream. > I think it would be a good idea to align AudioTrack/VideoTrack and MediaStreamTrack by changing their specs. I think the best thing to do would be to change MediaStreamTrack to fit AudioTrack/VideoTrack. E.g. we could change MediatStreamTrack.kind to "type" (and add it to AudioTrack/VideoTrack), and add "kind" and "language" to MediaStreamTrack. Martin, what do you think? Rob -- Jtehsauts tshaei dS,o n" Wohfy Mdaon yhoaus eanuttehrotraiitny eovni le atrhtohu gthot sf oirng iyvoeu rs ihnesa.r"t sS?o Whhei csha iids teoa stiheer :p atroa lsyazye,d 'mYaonu,r "sGients uapr,e tfaokreg iyvoeunr, 'm aotr atnod sgaoy ,h o'mGee.t" uTph eann dt hwea lmka'n? gBoutt uIp waanndt wyeonut thoo mken.o w _______________________________________________ dev-media mailing list [email protected] https://lists.mozilla.org/listinfo/dev-media
