Re: [Alsa-user] Audigy SPDIF Output Sample Rate
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From: The O. V. <the...@br...> - 2005-02-25 21:44:41
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On Fri, 2005-02-25 at 12:17 -0500, Lee Revell wrote: > On Sun, 2005-02-20 at 01:28 -0500, Brian L Scipioni wrote: > > I'm using yesterday's CVS. > > > > The new alsamixer control "Audigy SPDIF Output Sample Rate" for the > > emu10k1 toggles the sample rate among 44100, 48000 and 96000. I believe > > the mapping here is wrong (or at least the 3 rate labels are reversed). > > My 5.1 receiver will accept 441000, 48000 or 96000 from SPDIF. When it > > receives a 96KHz, signal it will indicate that with "96 k" printed out > > on the receiver front panel LEDs. It does that when alsamixer selects > > 44100 and NOT 48000 or 96000. So when alsamixer displays 44100, it > > appears 96000 is actually being output. > > > > Thanks. Please try the attached patch. > > Does your receiver tell you if it's receiving 48000 or 44100? If so > please check that those are also correct. > > So, have you tested that 96KHz SPDIF playback sounds OK? None of the > alsa developers seem to have a 96KHz capable receiver (unless someone > want to give me one ;-)) so this is all untested so far. > > > Also some new behavior with the latest CVS: > > When monitoring Aux2 in, the sound is badly distorted until the "Audigy > > SPDIF Output Sample Rate" switch is toggled back and forth among the > > rates. After a little rate switching, the sound becomes fine. > > This is probably related to this cryptic comment from some Creative > engineer: > > 298 if (emu->revision == 4) { /* audigy2 */ > 299 /* Unmute Analog now. Set GPO6 to 1 for Apollo. > 300 * This has to be done after init ALice3 I2SOut beyond 48KHz. > 301 * So, sequence is important. */ > 302 outl(inl(emu->port + A_IOCFG) | 0x0040, emu->port + A_IOCFG); > > We have no idea what "Alice3" and "Apollo" are, though we have some good > guesses ;-) > > I'll see if I can fix this. The comment implies that in order to set > 96KHz mode, we may have to mute and unmute analog around the samplerate > register setting. So instead of noise you would get a brief silence. > > Lee As someone who does have a 96 Khz capable reciever, I thought I might add my own comments tho this. The 96khz setting works perfect, sounds perfect with this patch; however, 48 & 44.1 are reversed now. Trying to play 48khz samples when the setting is 44.1 causes ugly scratchy distortion, but oddly, only on the right channel. Using the spdif raw PCM device, which reverses left and right channels of a stereo file, still has the distortion on the right channel. No luck with ac3 at any sample rate, but ac3 passthrough has never worked for me, and I have tried basically everything suggested on this mailing list to others with similar problems. The reason I'm always quick to test any patch/change that touches emu10k1 SPDIF is because I'm always hopeful it will somehow also solve my AC3-deficiency. No luck with _that_ so far. Oh well... One thing tho: iecset still lists the spdif output rate as 48khz when it's set to 96khz, even though the reciever does say it's getting 96khz. Furthermore, trying to use "iecset rate 96000" causes iecset to report 44.1khz... but no change on the reciever, it still says 96khz if it's set that way in the alsa mixer, Should this be the case? Another - wouldn't in fact iecset be what you should use to change this setting, rather than have a mixer element for it? I saw a change like that was done in another driver recently, so perhaps that'd be a good idea for emu10k1 as well, if only for the sake of consistency? Notes: My card is an Audigy2 Platinum, my amp is a Denon AVR-3803, and I'm using the optical spdif connector on the audigy drive to connect them. |