On Wed, 2018-12-05 at 15:08 +0530, Arun Raghavan wrote: > Hey folks, > I've written up a quick analysis of the channel positions we > currently support, and what I think makes sense: > > https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/merge_requests/55#note_85318 > > The summary is that "Rear Left/Right" is currently being used in > place of what should be "Left/Right Surround", and we do not have any > channel position between that position and "Rear Center", which is > needed for common 7.1 configurations (what would be "Rear Left/Right > Surround"). > > To add to this, the PulseAudio channelmap header is incorrect in that > we say that "Side Left/Right" should correspond to Dolby "Surround > Left/Right" when they are separate (they are further forward than > "Surround Left/Right". Yhis can be corrected easily enough as it's > just a documentation comment. > > My proposal is to add a "Rear Left/Right of Center" position to > represent the missing positions. At the ALSA level, it would > correspond to RLC/RRC. > > Any comments? If I understood correctly, you're proposing that we should have three surround channel pairs (side, surround and rear) instead of two (side and rear). What practical problem would this solve? I'm aware of the problem that some 5.1 streams use side and some use rear in their channel map specification (I don't know if there's any good reason for this), and up until very recently we didn't handle the side case properly. However, Alexander fixed this: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/commit/73156649e76ac4000931990edcdcb3be31aade7b -- Tanu https://www.patreon.com/tanuk https://liberapay.com/tanuk _______________________________________________ pulseaudio-discuss mailing list pulseaudio-discuss@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
