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Amd released radeon specs for HDMI Audio

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  • Amd released radeon specs for HDMI Audio

    Since I found no information in the right forum section here (all information went into the fglrx section of the forum under a different title...), amd seems to have released the specs for HDMI Audio on radeon cards. I bet this enables the drivers to support more than stereo or compressed 5.1 channel output in the next neartime.

    See here for reference:

    http://www.x.org/docs/AMD/AMD_HDA_verbs.pdf

    This was brought to my audience by xbmc developer fritsch who also got some good news for AMD OSS driver users: XBMC will work with the drivers in a near timeframe. A big missing piece was the missing support of the GLX extension VDPAU_INTEROP for mixed GL/video contexts. Christian Koenig has a patchset in his mesa git which adds in that extension.

    See here:

    http://cgit.freedesktop.org/~deathsi...217e1bd7ac2efc

    So after all this is a pretty well day for amd powered mediapcs !

  • #2
    Yeah - we have it already implemented (multi port missing yet). Was a nice feeling when I listened to the first LPCM 5.1 192 khz flac file in my living room :-)

    Anssi, xbmc team member is heading the development, if all goes well - tomorrow the code can hit alsa-dev ML.

    No luck we have yet with DTS-HD, TrueHD passthrough - but who cares, when LPCM is working correctly.

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    • #3
      Originally posted by fritsch View Post
      Yeah - we have it already implemented (multi port missing yet). Was a nice feeling when I listened to the first LPCM 5.1 192 khz flac file in my living room :-)

      Anssi, xbmc team member is heading the development, if all goes well - tomorrow the code can hit alsa-dev ML.

      No luck we have yet with DTS-HD, TrueHD passthrough - but who cares, when LPCM is working correctly.

      Wow great news indeed. I have to admit I was very pessimistic about audio driver in linux, esp. since parts of it are copyrighted material to whom realtek owns the patents. But boy was I wrong. Good for AMD this.

      Kind regards
      Brutalix.

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      • #4
        Has hit world: http://mailman.alsa-project.org/pipe...er/066578.html

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        • #5
          Originally posted by fritsch View Post
          No luck we have yet with DTS-HD, TrueHD passthrough - but who cares, when LPCM is working correctly.
          I do! LPCM is of little value for me (and many others I'd say) since the normal use case is that DTS/DD is decoded by the AVR, not the PC.

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          • #6
            Perhaps you can look into the spec again.
            DTS and DD only need 2 channel pcm audio and that works since ages. LPCM is a requirement (the number of channels) to Bitstream Audio like DTS-HD, TrueHD, which is coded over 8 channels. Btw. if your receiver can DTS-HD _and_ TrueHD - he also can do 7.1 LPCM.

            So much about your technical facts :-)

            Btw. (as of today monday) the following therefore works:

            DTS 96/24
            DTS
            Dolby Digital (Ac3)
            E-AC3 (including 8 Channels)
            5.1 / 7.1 LPCM including 192 khz - for example if you have high quality 5.1 flacs, those are played in that format.

            What not works for now is passthrough of:
            DTS-HD and TrueHD (here something will happen during that week).

            Those two formats have a CORE, which makes it possible to just play the DTS or AC3 track out of those. As you have LPCM anyways, just use this.
            Last edited by fritsch; 09-23-2013, 02:52 AM.

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            • #7
              Originally posted by fritsch View Post
              Perhaps you can look into the spec again.
              DTS and DD only need 2 channel pcm audio and that works since ages. LPCM is a requirement (the number of channels) to Bitstream Audio like DTS-HD, TrueHD, which is coded over 8 channels. Btw. if your receiver can DTS-HD _and_ TrueHD - he also can do 7.1 LPCM.
              DD 5.1 (3/2.1) needs only 2 channel pcm?

              And no, my receiver can't do tha *HD variantes, just normal DTS/DD for up to 6 channels.

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              • #8
                DD and DTS are "virtual formats" coded via 2 channels pcm.

                So the new HDA spec is not needed for you and your receiver at all.

                But you could show a bit of happiness for all the other folks outside ;-)

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                • #9
                  This is really good news!

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