The following issue has been ASSIGNED. ====================================================================== <https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1651> ====================================================================== Reported By: tycordinal Assigned To: jcdutton ====================================================================== Project: ALSA - driver Issue ID: 1651 Category: PCI - emu10k1 Reproducibility: always Severity: minor Priority: normal Status: assigned Distribution: Kernel Version: 2.4.31 ====================================================================== Date Submitted: 12-14-2005 09:44 CET Last Modified: 07-18-2006 14:43 CEST ====================================================================== Summary: ac3 passthrough not really work with ac3dec Description: using the following from alsa-tools to play ac3 as passthrough: ac3dec -C oneac3file.ac3 the ac3dec is able to "open" the spdif device "iec958:{AES...}" and did not report any error and keep on running, but the ac3 decoder (creative ddts-100), connected to the "spdif output" from the card, did not switch to dolby mode, and no sound come out from speaker. one interesting thing is, when I run this: ac3dec -6 oneac3file.ac3 As this is software decoding to PCM, I can hear the left/right channels from the front stereo jacket, as they also output on the "spdif output". Therefore, I believe the "spdif output" on the card is indeed working, just that for this card we might need to write some different AES command to open the spdif output? I am not sure if the alsa config files in /usr/share/alsa have to change or maybe some "switches" in emu10k1_main.c needs to apply for the "spdif output" to really behave as "iec958" device to passthough ac3 stream to external decoder. Thanks. ====================================================================== ---------------------------------------------------------------------- tycordinal - 12-14-05 10:05 ---------------------------------------------------------------------- output for : ac3dec -C oneac3file.ac3 Using PCM device 'plug:iec958:{AES0 0x2 AES1 0x82 AES2 0x0 AES3 0x2}' ---------------------------------------------------------------------- tycordinal - 12-14-05 10:15 ---------------------------------------------------------------------- I use alsamixer to monitor ac3dec action. ac3dec -C oneac3file.ac3 When ac3dec is NOT running: IEC958 Optical Raw: MM (Muted?) when ac3dec IS running: IEC958 Optical Raw: OO (opened? / not muted?) when it stopped: IEC958 Optical Raw: MM (Muted?) Is this the reason that ac3dec cannot do ac3 passthrough ? when ac3dec do software decode, IEC958 Optical Raw STAYS as MM , and I can hear the left/right channels of that ac3 file, so I believe the spdif output is working, just that this time the ac3dec software have to change something (or NOT to change something :) . ---------------------------------------------------------------------- tycordinal - 12-14-05 10:16 ---------------------------------------------------------------------- ac3dec to do software decoding: ac3dec -6 thatac3file.ac3 5.1 Mode 48.0 KHz 448 kbps Complete Main Audio Service Using PCM device 'plug:surround51' ---------------------------------------------------------------------- pzad - 12-14-05 10:30 ---------------------------------------------------------------------- IEC958 Optical Raw - this looks correct. Problem can be with "Audigy Analog/Digital Output Jack". Looks like Audigy 4 works diffrently as others Audigy *. Try to find file /usr/share/alsa/conf/cards/Audigy2.conf. In this file find this { name "Audigy Analog/Digital Output Jack" lock true preserve true value 1 } and change it to { name "Audigy Analog/Digital Output Jack" lock true preserve true value 0 } ---------------------------------------------------------------------- tycordinal - 12-14-05 10:31 ---------------------------------------------------------------------- interesting things: when doing ac3dec -6 oneac3file.ac3 , there is sound coming out from the spdif output, and when i use alsamixer to make "IEC958 Optical Raw" from "MM" to become "OO", the sound stop coming out. When I make it as "MM", the sound come back again. In this case, alsamixer can toggled the sound output, if spdif output is playing digital stereo. when doing ac3dec -C oneac3file.ac3, alsamixer show "IEC958 Optical Raw" as "OO" , and there is no dolby light on the decoder (creative DDTS-100). when I make it "MM", there is still no dolby light. when I exit alsamixer and run alsamixer again, "IEC958 Optical Raw" has become "OO". In this case, alsamixer cannot help to get ac3 passthough from the spdif output, because it cannot really make "IEC958 Optical Raw" as "MM", even though it seems it can. After ac3dec finished, "IEC958 Optical Raw" back to "MM" again, as shown by running alsamixer again. ---------------------------------------------------------------------- pzad - 12-14-05 10:53 ---------------------------------------------------------------------- IEC958 Optical Raw - this is just multiplexer switch. If there is MM - this means spdif output comes from DSP and from normal playback device. If there is OO - spdif output comes from iec958 (or spdif) device. Please do, what I suggest you in previous note. Your problem is "Audigy Analog/Digital Output Jack" control. Issue History Date Modified Username Field Change ====================================================================== 12-14-05 09:44 tycordinal New Issue 12-14-05 09:44 tycordinal Kernel Version => 2.4.31 12-14-05 10:05 tycordinal Note Added: 0007031 12-14-05 10:15 tycordinal Note Added: 0007032 12-14-05 10:16 tycordinal Note Added: 0007033 12-14-05 10:30 pzad Note Added: 0007034 12-14-05 10:31 tycordinal Note Added: 0007035 12-14-05 10:53 pzad Note Added: 0007036 07-18-06 14:43 jcdutton Status new => assigned 07-18-06 14:43 jcdutton Assigned To => jcdutton ====================================================================== ------------------------------------------------------------------------- Take Surveys. Earn Cash. 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