[alsa-devel] Having a fight withsnd_sctl_install:src/control/setup.c in alsa-lib-1.0.14a

[Bouterse, Bob]

Further information. The behaviour was caused by the default iec958.conf
file. I removed the entries that set the AES bits and it stopped
pouncing on my settings. I can only say I wish there was some way
through the API to restrain the pcm_hooks plugin.

> -----Original Message-----
> From: alsa-devel-bounces at alsa-project.org
[mailto:alsa-devel-bounces at alsa-
> project.org] On Behalf Of Bouterse, Bob
> Sent: Tuesday, March 18, 2008 11:32 AM
> To: alsa-devel at alsa-project.org
> Subject: [alsa-devel] Having a fight
> withsnd_sctl_install:src/control/setup.c in alsa-lib-1.0.14a
> 
> I am using alsa-lib-1.0.14a on a VIA EPIA 15000g board.
> 
> I am hoping that someone can help me. I have been in an entrenched
fight
> with the sctl functions setting my ctl setting back to the config file
> values.
> 
> I am working on some extensions to the alsa audio output plugins in
xine
> to provide simultaneous analog and iec958 on a Via EPIA 15000g, board.
> 
> The issue is that I need to set the iec958 status bits at runtime, but
> everytime I call:
> 
>
/*----------------------------------------------------------------------
> -----*/
> 	...
> 
> 	snd_ctl_elem_value_get_iec958(cval, &iec958);
> 	llprintf(LOG_MIXER,"Read
> AES0=0x%02x,AES1=0x%02x,AES2=0x%02x,AES3=0x%02x\n",
> 		   iec958.status[0], iec958.status[1], iec958.status[2],
> iec958.status[3]);
> 
> 	/* AES0=0x6,AES1=0x82,AES2=0x0,AES3=0x2 */
> 	iec958.status[0] = IEC958_AES0_NONAUDIO |
> IEC958_AES0_CON_NOT_COPYRIGHT;
> 	iec958.status[1] = IEC958_AES1_CON_PCM_CODER |
> IEC958_AES1_CON_ORIGINAL;
> 	iec958.status[2] = 0x00;
> 	iec958.status[3] = IEC958_AES3_CON_FS_48000;
> 
> 	llprintf(LOG_MIXER,"Writing
> AES0=0x%02x,AES1=0x%02x,AES2=0x%02x,AES3=0x%02x\n",
> 		   iec958.status[0], iec958.status[1], iec958.status[2],
> iec958.status[3]);
> 
> 	/* store the values */
> 	snd_ctl_elem_value_set_iec958(cval, &iec958);
> 	if ((err = snd_ctl_elem_write(ctl_handle, cval)) < 0) {
> 		xprintf (this->class->xine, XINE_VERBOSITY_DEBUG,
> "snd_ctl_elem_write(): %s\n", snd_strerror(err));
> 	}
> 
> 	...
>
/*----------------------------------------------------------------------
> -----*/
> snd_sctl_install resets the IEC958 status bits back to the original
> values!
> 
> I am pulling my hair out trying to understand how to stop this.
> 
> Unfortunately I don't have much time to fix this, please help.
> 
> 
> ----------------------------------------------------
> Bob Bouterse
> Sr. Software Engineer
> Office of the CTO
> D&M Holdings Inc.
> 1-317-616-6541
> (fax) 1-317-616-6541
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> Alsa-devel mailing list
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