http://www.mplayerhq.hu/DOCS/HTML/en/advaudio-surround.html
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/1264609 Title: No AC3 paththrough with hda intel ALC887-VD Saucy Status in “alsa-driver” package in Ubuntu: New Bug description: Ubuntu 13.10 linux-image-extra-3.11.0-14-generic: 3.11.0-14.21 The original problem is that I have not managed to play AC3 sound bit perfect from a DVD to the AMP. I think I have tracked down the problem to an Alsa issue: I expect: aplay -vv -D iec958:CARD=PCH,DEV=0 Norrlanda.wav to play the file with all 6 channels via fiber optic to my amplifier like outlined at http://alsa.opensrc.org/DigitalOut Instead, there is only silence. This is the output: $ pasuspender -- aplay -v -v -D iec958:CARD=PCH,DEV=0 /home/daniel/workspace/Testsounds/Norrlanda.wav Wiedergabe: WAVE '/home/daniel/workspace/Testsounds/Norrlanda.wav' : Signed 16 bit Little Endian, Rate: 44100 Hz, stereo Hooks PCM Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 16384 period_size : 4096 period_time : 92879 tstamp_mode : NONE period_step : 1 avail_min : 4096 period_event : 0 start_threshold : 16384 stop_threshold : 16384 silence_threshold: 0 silence_size : 0 boundary : 4611686018427387904 Slave: Hardware PCM card 1 'HDA Intel PCH' device 1 subdevice 0 Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 44100 exact rate : 44100 (44100/1) msbits : 16 buffer_size : 16384 period_size : 4096 period_time : 92879 tstamp_mode : NONE period_step : 1 avail_min : 4096 period_event : 0 start_threshold : 16384 stop_threshold : 16384 silence_threshold: 0 silence_size : 0 boundary : 4611686018427387904 appl_ptr : 0 hw_ptr : 0 #############+ | 25% Here some additional observations: * The Norlanda.wav file is played with 6 channels too pulseaudio (6 sliders at the pavucontrol input pane) but only PCM Stereo is transmitted to the amp. * I can play stereo wave files fine with the aplay command from above * If I switch to non-audio (ac3) mode, I cannot play stereo files any more, but the ac3 file produces still silence. $ iecset -D hw:1 audio 0 Mode: consumer Data: non-audio Rate: 48000 Hz Copyright: permitted Emphasis: none Category: PCM coder Original: original Clock: 1000 ppm I have already setup a build environment for the hda modules, but I got lost inside the code. Any ideas how to nail down the problem? Thank you! Daniel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1264609/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
