Date: Tue, 24 Jan 2012 18:33:01 +0200 From: Alexander Motin <mav@FreeBSD.org> To: =?ISO-8859-1?Q?Micka=EBl_Maillot?= <mickael.maillot@gmail.com> Cc: freebsd-multimedia@freebsd.org, FreeBSD current <freebsd-current@freebsd.org> Subject: Re: [RFT] Major snd_hda rewrite Message-ID: <4F1EDD3D.6070800@FreeBSD.org> In-Reply-To: <4F1EB305.9000105@FreeBSD.org> References: <4F0DE3FD.2020203@FreeBSD.org> <20120112121853.GC1429@procyon.xvoid.org> <4F0ED8D0.8080403@FreeBSD.org> <CAKT0JB5xP__9KacknmkT8_QrC1hsq8Gj5quRY_FvgmB=sJGmSQ@mail.gmail.com> <4F171D7A.4080003@FreeBSD.org> <CAKT0JB6u-b1CTcYVphLnEf-rHCmuSLJJFrYOiiqChJKDYtRHtQ@mail.gmail.com> <4F177979.5010106@FreeBSD.org> <CAKT0JB7k0V42w0WGN1mq4sKgQxqbnf_NoDRZAxPrMGebuvUH2g@mail.gmail.com> <CAKT0JB5zOjmy1R13W%2BbY453VySOkYcShpnHwk8kbT=-yAUC2vQ@mail.gmail.com> <CAKT0JB5xHJ7=UFHDhumsiMqfYGEPV6QyNz2YbHb%2BojOUgw23WA@mail.gmail.com> <4F1ACBA8.6000203@FreeBSD.org> <CAKT0JB7Z=pwv9oryCcu2OV7kHnkXjPj-cYY_=0c6PMbNF1BLTw@mail.gmail.com> <4F1EB305.9000105@FreeBSD.org>
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On 01/24/12 15:32, Alexander Motin wrote: > On 01/24/12 14:57, Mickaël Maillot wrote: >> 2012/1/21 Alexander Motin <mav@freebsd.org <mailto:mav@freebsd.org>> >> From that description I can conclude that you are passing through >> compressed DTS-HD and TrueHD streams to the receiver. What are the >> bitrates of streams you are playing? It looks like your receiver >> doesn't receives all data. If I understand right, to transfer with >> compressed bitrates above 6.144Mbps special High Bit Rate mode >> should be activated in CODEC, when data stream occupies all 8 HDMI >> channels instead of 2. I haven't implemented this feature yet as my >> receiver doesn't support such HD formats. >> >> >> i dont think bitrate is over 6.144Mbps. >> for TrueHD files, mediainfo reports: >> >> Format profile : TrueHD / Core >> Mode extension : CM (complete main) >> Codec ID : 131 >> Bit rate mode : Variable / Constant >> Bit rate : Unknown / 640 Kbps >> Maximum bit rate : 2 868 Kbps / 640 Kbps >> Channel(s) : 6 channels >> >> and for DTS-HDMA, mediainfo can't calculate it, but from description, >> all tested file have bitrate below 3689 kbps > > Then make sure that your player properly sets "sampling rate" for the > playback. Data transferred as "16bit stereo", but depending on bit rate > may have 48000, 96000 or 192000Hz sampling rate (up to 1.5Mbps, 3Mbps > and 6Mbps respectively). For higher bit rates stream transferred as > 8-channel (High Bit Rate mode) with same set of frequencies (but now up > to 12, 24 and 49Mbps). > >> I'll try to make a patch for it a bit later and send you to try. >> >> i'll be happy to try it. Here is it: http://people.freebsd.org/~mav/hda.HBR.patch It should activate HBR mode if you try to play stream with AC3 format and 8 channels (>6Mbps). >> Until that time, is it possible to make your xbmc to decode those HD >> streams into different number of uncompressed LPCM channels to play >> it that way? >> >> >> yes, it's just an option. >> >> It would be interesting to test 6.0, 6.1, 7.0 and 7.1 LPCM >> configurations with your receiver. Or at least normal definition 7.1 >> playback would be interesting to test (you can just set vchanformat >> to s16le:7.1 or s32le:7.1 and play anything). >> >> i sucessfully tried 6.1 and 7.1 LPCM in 16 bits. >> just a small channel order issue (center and a surround back inversion) >> which can be solved easily. > > In what number of channels which channels are swapped specifically? I've > compared mapping I am setting in driver with data I have and found no > problem. What channel order for 7.1 uses xbmc? sound(4) uses: Left, > Right, Rear Left, Rear Right, Center, LFE, Side Left, Side Right. I've > never could check what mplayer thinks about it because I have no such > such media. Can you give me some example? > >> i'll add 32bits support in XBMC later for my test but from what you say, >> it'll not work because 8 channels / 48khz / 16 bits = 6.144 Mbit/s. > > 6Mbps limitation is only for data, as they use only two channels by > default. Audio stream has no such limit. -- Alexander Motin
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