Re: [alsa-cvslog] CVS: alsa-lib/test iecbits.c,NONE,1.1 iecset.c,NONE,1.1 .cvsignore,1.11,1.12 Makefile.am,1.24,1.25

[Takashi Iwai <tiwai@suse.de>]

At Tue, 30 Sep 2003 18:20:24 +0100,
James Courtier-Dutton wrote:
> 
> Takashi Iwai wrote:
> > Update of /cvsroot/alsa/alsa-lib/test
> > In directory sc8-pr-cvs1:/tmp/cvs-serv8451
> > 
> > Modified Files:
> > 	.cvsignore Makefile.am 
> > Added Files:
> > 	iecbits.c iecset.c 
> > Log Message:
> > added iecset program (this could be to alsa-utils after more
> > enhancements).
> > 
> This could be useful for a number of reasons.
> One reason it might help for is this.
> 1) Application outputing to the "front" device outputs sound to the 
> spdif with PCM iec mode set.
> 2) Application finishes, leaving PCM iec mode set.
> 3) New application outputs AC3 stream with NON-AUDIO iec mode set.
> 4) Application finishes, leaving PCM iec mode set.
> 5) New application outputs AC3 stream with NON-AUDIO iec mode set.
> 6) Application gets killed with "kill -9 PID" leaving NON-AUDIO iec mode 
> set.
> 7) Application outputing to the "front" device outputs sound, but the 
> spdif is left in NON-AUDIO iec mode, so no sound comes out of the spdif.
>  From then onwards all application outputting sound will default to 
> NON-AUDIO bit being set, when the sensible assumption would be to set 
> PCM mode as default, and only set NON-AUDIO mode when using a device 
> name like "iec958:AES0=0x6,AES1=0x82,AES2=0x0,AES3=0x2"
> 
> So my question is, can iecbits.c code be used to set the default iec 
> mode back to PCM, if it has accidentally been fixed on NON-AUDIO due to 
> the kill -9 ?

yes, just run:

	% iecset audio yes

for changing the sample rate to 44.1kHz and switch to professional
mode with non-audio mode, run it like:

	% iecset prof yes rate 44100 audio no

the program will dump the current status (after changing values if any
given), too, like below:

	% iecset 
	Mode: consumer
	Data: audio
	Rate: 48000 Hz
	Copyright: permitted
	Emphasis: none
	Category: mixer
	Original: original
	Clock: 1000 ppm

with -x option, it will print AES arguments for convenience, instead
of human readable information:

	% iecset -x
	AES0=0x04,AES1=0x92,AES2=0x10,AES3=0x02

as mentioned above, it's put just for tests, so far.
if there is enough demand, it should be on alsa-utils, of couse :)


Takashi


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