On Fri, 2008-08-15 at 16:59 +0200, Takashi Iwai wrote:
At Sat, 16 Aug 2008 00:45:33 +1000, Ben Stanley wrote:
Could you please clarify 'independent PCM IEC958 status bits' vs 'default IEC958 status bits', perhaps by pointing out some drivers implementing each type?
Run the following: grep -r 'IEC958.*PCM_STREAM' sound/pci
These drivers have "IEC958 Playback PCM Stream" controls. These controls are assigned to PCM streams, and changed individually from the "IEC958 Playback Default" control. When the PCM stream is closed, it's back to the status of "IEC958 Playback Default".
Thanks for the info.
You can change the status easily via iecset program in alsa-utils.
I note here that iecset does not accept --device=hw:0,1 for example. Any reason for this?
Because it's invalid. The --device option is for a control device, not for a PCM device. If you want to change the secondary control (i.e. "IEC958 Playback Default" with index=1), pass "-n 1" to iecset.
um, that doesn't work either.
mythtv@mythtv:~$ iecset -D=hw:0 -n 1 audio on iecset: invalid option -- n Usage: iecset [options] [cmd arg...] Options: -D device specifies the control device to use -c card specifies the card number to use (equiv. with -Dhw:#) -x dump the dump the AESx hex code for IEC958 PCM parameters -i read commands from stdin Commands: professional (common) off = consumer mode, on = professional mode audio (common) on = audio mode, off = non-audio mode rate (common) sample rate in Hz emphasis (common) 0 = none, 1 = 50/15us, 2 = CCITT lock (prof.) off = rate unlocked, on = rate locked sbits (prof.) sample bits 2 = 20bit, 4 = 24bit, 6 = undef wordlength (prof.) 0=no, 2=22-18bit, 4=23-19bit, 5=24-20bit, 6=20-16bit category (consumer) 0-0x7f copyright (consumer) off = non-copyright, on = copyright original (consumer) off = 1st-gen, on = original
I see that I have alsa-utils 1.0.15-3ubuntu2 (from ubuntu 8.04). Perhaps my version is too old?
I will use my clunky old method for now, but I would like to clear up this iecset issue.
Ben.