this is too sick indeed (https://lists.apple.com/archives/coreaudio-api/2013/Mar/msg00128.html)
i have to talk to clemens about whether this is worth the effort in addition to the natural PCM formats he’s specified. if this format is easy to deal with, then it’s gonna take this card to the next level for real. i have some questions about this: knowing that SPDIF’s physical properties are 2.1, do we even touch the number of channels? i assume we leave it as a two channel signal that is passed in this format, and expect our amp to do the rest? anyone know how the dolby atmos wrinkle (added in CRAPALINA [10.15] https://developer.dolby.com/platforms/apple/macos/os-support/) manifests? -maybe the kIOAudioStreamSampleFormat1937AC3 somehow adds dolby or something? this is kind of exciting. Thanks, Gagan > On Mar 19 2013, at 7:23, Jeff Moore <email@fuckinghiddenWTFlol> wrote: > > Yes. The data that comes down to the driver will be AC-3. Note that because > the format is not mixable, there are parts of the IOAudio family's data > transfer pipe that get skipped, particularly the mixing parts. > > -- > > Jeff Moore > Core Audio > Apple > > > >> On Mar 19, 2013, at 5:49 PM, Phil Montoya <email@hidden> wrote: >> >> Very nice! So if we publish an IOAudioStream format with the Dolby sample >> format, what will we get in our clip call? Will it be Dolby encoded audio >> data? I ask this because PCM formats arrive as floats so we do have to do >> some conversion. I'm wondering what type of conversion (if any) is needed >> for Dolby? >> >> -Phil >> >> >> On Mar 19, 2013, at 5:29 PM, Jeff Moore <email@hidden> wrote: >> >>> Dolby is the format that is called kIOAudioStreamSampleFormat1937AC3 in >>> the header. The format is a bitstream that would be sent over a SPDIF cable. >>> >>> -- >>> >>> Jeff Moore >>> Core Audio >>> Apple >>> >>> >>> >>>> On Mar 19, 2013, at 5:24 PM, Phil Montoya <email@hidden> wrote: >>>> >>>> I'm wondering if it is possible to support Dolby encoded audio in a core >>>> audio driver? I don't see Dolby as a choice for the sampleFormat in the >>>> IOAudioStreamFormat. >>>> >>>> >>>> _______________________________________________ >>>> Do not post admin requests to the list. They will be ignored. >>>> Coreaudio-api mailing list (email@hidden) >>>> Help/Unsubscribe/Update your Subscription: >>>> >>>> This email sent to email@hidden >> >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Coreaudio-api mailing list (email@hidden) >> Help/Unsubscribe/Update your Subscription: >> >> This email sent to email@hidden >> _______________________________________________ Do not post admin requests to the list. They will be ignored. Coreaudio-api mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/coreaudio-api/archive%40mail-archive.com This email sent to [email protected]
