I'm trying to write a rule for the Layla24. That card supports all standard
sample rates 8KHz-96KHz and continuous rates only in the range 25KHz-100KHz.
I wrote this rule, but ALSA gets confused and it sometimes chooses a wrong
value, sometimes fails. I can't figure out why. This is the rule:
{
snd_interval_t *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
unsigned int rates[] = {8000, 11025, 16000, 22050, 32000, 44100, 48000, 88200,
96000, 0};
int r;
printk("req min=%d max=%d\n",rate->min,rate->max);
if (rate->max < 25000) {
printk("list\n");
return snd_interval_list(rate, 4, rates, 0);
}
if (rate->min >= 25000 && rate->min == rate->max) {
/* If it's a standard rate, do nothing */
for (r = 0; rates[r]; r++)
if (rates[r] == rate->min)
return(0);
printk("cont\n");
params->rate_num = LAYLA24_MAGIC_NUMBER;
params->rate_den = LAYLA24_MAGIC_NUMBER / rate->min;
}
return 0;
}
If it is a standard sample rate or it's in the continuous range, it's all
right. Otherwise snd_pcm_hw_params_set_rate_near() fails:
[EMAIL PROTECTED] Giu]$ aplay -v -f S32_LE -c 2 -r 11020 -D hw:0,0,2 booo.html
Playing raw data 'wget' : Signed 32 bit Little Endian, Rate 11020 Hz, Stereo
aplay: aplay.c:824: set_params: Assertion `err >= 0' failed.
--
Giuliano.
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