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I think Sonos sued the heck out of Google for those, and it caused those devices to disappear for a few years. Sonos lost that case late last year though, so hopefully we'll see a resurgence?
https://www.reuters.com/legal/litigation/google-wins-repriev...
Otherwise, you can DIY it with a bunch of old devices or Raspberry Pis and https://github.com/geekuillaume/soundsync
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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connectedhomeip
Matter (formerly Project CHIP) creates more connections between more objects, simplifying development for manufacturers and increasing compatibility for consumers, guided by the Connectivity Standards Alliance.
https://github.com/project-chip/connectedhomeip/blob/master/...
2. Only native apps are supported. There's no protocol to say open a webpage & control that.
3. No support for multi-party sessions. Only one user can interact at a time.
4. No support for the Web's Presentation API. Since it's not based around urls & web pages, it would require lots of additional work to make it support the standard web pages have to spawn a remote display.
By compare, Open Screen Protocol lets any target device open any web page, which is very similar to how Chromecast development works today. Whether the target device is Android, Apple, WebOS, Windows, Tizen, or other, the expectation that I could Open Screen Protocol cast to it remains the same. Where-as Matter Cast requires a native app on the device & the app has to be installed & potentially even greenlit by the target device platform itself.
OpenScreenProtocol really looks to have it all, & the model is so much more universal. Really wish we saw some device makers pushing for it these days.
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I fairly certain that the academic open source community had already published prior art for delay correction and volume control of speaker groups (which are obvious problems when you add multiple speakers to a system with transmission delay). IIRC there was a microsoft research blog post with a list of open source references for distributed audio from prior to 2006 for certain. (Which further invalidates the patent claims in question).
Before they locked Chromecast protocol down, it was easy to push audio from pulseaudio sound server to Chromecast device(s).
The patchbay interface in soundsync looks neat. Also patch bay interfaces: BespokeSynth, HoustonPatchBay, RaySession, patchance, org.pipewire.helvum, easyeffects: https://github.com/BespokeSynth/BespokeSynth/issues/1614#iss...
pipewire handles audio and video streams. soundsync with video would be cool too.
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Another addition to https://killedbygoogle.com/.
