From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: usb quattro
Date: Wed, 04 Sep 2002 16:55:37 +0200
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To: Patrick Shirkey <pshirkey@boosthardware.com>
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At Wed, 04 Sep 2002 23:51:25 +0900,
Patrick Shirkey wrote:
> 
> Takashi Iwai wrote:
> > At Wed, 04 Sep 2002 23:32:25 +0900,
> > Patrick Shirkey wrote:
> > 
> >>I have just found that the quattro will not output an audible stream 
> >>from the external input channels until it has been made to output a 
> >>stream through the internal i/o first.
> >>
> >>This means that the direct monitor switch does not work until a file is 
> >>played internally through the card.
> >>
> >>After that everything works as expected.
> >>
> >>Is this a fixable bug or should I make a note in the online docs about it?
> > 
> > 
> > could you check whether only hw_params() (prepare()) sets up enough,
> > or do you really need to feed data to the output?
> > 
> 
> I can, how should I go about doing so?

well, just write a few codes...

#include <alsa/asoundlib.h>

int main()
{
	snd_pcm_t *pcm;
	int err;
	snd_pcm_hw_params_t hw;

	err = snd_pcm_open(&pcm, "hw:0,0", SND_PCM_STREAM_PLAYBACK, 0);
	snd_pcm_hw_params_alloca(&hw);
	err = snd_pcm_hw_params_any(pcm, hw);
	err = snd_pcm_hw_params_set_access(pcm, hw, SND_PCM_ACCESS_RW_INTERLEAVED);
	err = snd_pcm_hw_params_set_format(pcm, hw, SND_PCM_FORMAT_S16_LE);
	err = snd_pcm_hw_params_set_rate(pcm, hw, 48000, 0);
	err = snd_pcm_hw_params_set_channels(pcm, hw, 2);
	err = snd_pcm_hw_params_set_period_size(pcm, hw, 512, 0);
	err = snd_pcm_hw_params_set_buffer_size(pcm, hw, 1024, 0);
	err = snd_pcm_hw_params(pcm, hw);
	return err;
}


(not tested at all ;)


Takashi


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