I've been trying and trying and I just can't seem to get DD/DTS/AC3 to
work. My receiver receives PCM just fine so at least I know the
physical bits are working.
I have tried both mplayer and ac3dec to drive the card into decoding AC3
but no luck. I believe I have the mixer settings correct. In fact I
think I have everything unmuted and at somewhere in the 2/3 volume
range. I have IEC958 Loop disabled/muted and Direct Recording Source
set to IEC958.
When I use say mplayer to play a raw ac3 file (which it can downmix and
play analog through the liba52 codec) with:
# mplayer -v -ao alsa -afm hwac3 /video/Bjorn_Lynne-A-Lifetime-Of-Moments_\(5-1_surround\).ac3
mplayer tells me:
Trying to force audio codec driver family hwac3...
Opening audio decoder: [hwac3] AC3/DTS pass-through S/PDIF
dec_audio: Allocating 8192 bytes for input buffer.
dec_audio: Allocating 16384 + 65536 = 81920 bytes for output buffer.
No accelerated IMDCT transform found
hwac3: switched to AC3, 448000 bps, 48000 Hz
AUDIO: 48000 Hz, 2 ch, ac3, 448.0 kbit/29.17% (ratio: 56000->192000)
Selected audio codec: [hwac3] afm: hwac3 (AC3 through S/PDIF)
==========================================================================
Building audio filter chain for 48000Hz/2ch/ac3 -> 0Hz/0ch/??...
[libaf] Adding filter dummy
[dummy] Was reinitialized: 48000Hz/2ch/ac3
[dummy] Was reinitialized: 48000Hz/2ch/ac3
alsa-init: requested format: 48000 Hz, 2 channels, 100
alsa-init: using ALSA 1.0.11
alsa-spdif-init: playing AC3, 2 channels
alsa-init: using device iec958:{CARD 0 AES0 0x02 AES1 0x82 AES2 0x00 AES3 0x02}
alsa-init: pcm opend in blocking mode
alsa-init: chunksize set to 1024
alsa-init: fragcount=16
alsa-init: got buffersize=65536
alsa-init: got period size 1024
alsa: 48000 Hz/2 channels/4 bpf/65536 bytes buffer/Signed 16 bit Little Endian
AO: [alsa] 48000Hz 2ch ac3 (1 bytes per sample)
AO: Description: ALSA-0.9.x-1.x audio output
AO: Author: Alex Beregszaszi, Zsolt Barat <joy@xxxxxxxxxxxxxxxxx>
AO: Comment: under developement
Building audio filter chain for 48000Hz/2ch/ac3 -> 48000Hz/2ch/ac3...
[dummy] Was reinitialized: 48000Hz/2ch/ac3
[dummy] Was reinitialized: 48000Hz/2ch/ac3
Video: no video
Freeing 0 unused video chunks.
Starting playback...
But still the receiver does not kick into DD to decode.
ac3dec shows/does:
# ac3dec -C /video/Bjorn_Lynne-A-Lifetime-Of-Moments_\(5-1_surround\).ac3
Using PCM device 'plug:iec958:{AES0 0x2 AES1 0x82 AES2 0x0 AES3 0x2}'
AC3 Stream 48.0 KHz 448 kbps
But again, no DD decoding.
Any ideas?
b.
--
My other computer is your Microsoft Windows server.
Brian J. Murrell
Attachment:
signature.asc
Description: This is a digitally signed message part
------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
