Re: [Alsa-devel] Build-in mixer

[Dan Tihelka]

Paul Davis wrote:

perhaps you know this, but 

	"an error occured"

is an extremely content-free way of describing a problem.
 

I am sorry. I know it. But i don't know, if it was error caused by ALSA. 
There is a part of code in audio.c in alsa-xmms-0.9 which probably 
caused the error (I add some printf there):

        if(alsa_cfg.debug)
           printf("Starting to open device ....\n");
        if(alsa_cfg.use_user_device)
        {
           if(alsa_cfg.debug) printf("Opening user device: --%s--\n", 
alsa_cfg.user_device);
           if((err = snd_pcm_open(&alsa_pcm, alsa_cfg.user_device, 
SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0)
               alsa_error("error opening alsa device: %s", err);
        }
        if(alsa_cfg.debug)
           printf("Device opened\n");


and there is console output:

        Starting to open device ....
        Opening user device: --default--
        Xlib: unexpected async reply (sequence 0x963)!
I have no idea what kind of error it is.... But what it do, is to try open "default" device only, i suppose. And it should not caused problems, if I understand well:

no other change is necessary. however, to do what you want, you have
to redefine the "default" device to be a dmix device. clemens
takashi posted within the last couple of days how to do this.
 

My ~/.asoundrc file is:

        pcm.!default {
                type plug
                slave.pcm "dmix"
        }
And some lines behind #. It must be correct, because more than one 'aplay' play simultenaously (even though with "underrun!!! (...)" message).



I found other ALSA setting where hw: is used. It is called before snd_pcm_open() is called, and it looks like:

        void alsa_setup_mixer(void)
        {
        debug("alsa_setup_mixer")
                if(alsa_cfg.audio_card != 0)
           sprintf(card_id, "hw:%i", alsa_cfg.audio_card);
        
                snd_mixer_open(&mixer, 0);
        snd_mixer_attach(mixer, card_id);              // <------ there hw:0 is used
                snd_mixer_selem_register(mixer, NULL, NULL);
                snd_mixer_load (mixer);
        snd_mixer_selem_id_malloc(&pcm_elt);
		...... and many others, i don't know, if it is important.



I found, that variable card_id is set to "hw:0" string. Is there anything else, what should i try? Because i really love to use dmix plug-in together with another applications :-)

Thank You very much,
Dan
P.S. Frank Barknecht suggested: "You might have success with running these apps in OSS-mode and useing
alsa-oss". I try it, but it only one program was able to use ALSA at the same time. 





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