At Tue, 03 Jul 2007 11:50:34 -0700, GT Bradley wrote:
yes, I am aware that AC3 is required, I'm trying to get the AC3 pass-through configured. From your response, I understand now that speaker-test is performing as expected, however I have tired other things also: I have some AC3 encoded test files, and I have also tried installing ffmpeg, and liba52. and the ac3dec utility which I understand should pass through the AC3/DTS encoded files, but I recieve:
[root@ps3 Surround-SDL-testfiles]# ac3dec -C dolby-canyon.ogg Using PCM device 'plug:iec958:{AES0 0x2 AES1 0x82 AES2 0x0 AES3 0x2}' ALSA lib conf.c:3939:(snd_config_expand) Unknown parameters {AES0 0x2 AES1 0x82 AES2 0x0 AES3 0x2} ALSA lib pcm.c:2145:(snd_pcm_open_noupdate) Unknown PCM iec958:{AES0 0x2 AES1 0x82 AES2 0x0 AES3 0x2} snd_pcm_open: Invalid argument Output open failed
However if I am planning to write ac3 to the linux driver, are you saying that I would be better to write directly to the driver rather than through the ALSA layer?
You need set up the configuration for alsa-lib. Otherwise the iec958 PCM isn't defined. Usually the card-specific configuration is stored in /usr/share/alsa/cards/*.conf.
Takashi