At Thu, 14 Aug 2003 17:19:01 +0200 (CEST),
Thomas Charbonnel wrote:
>
> Hi,
>
> I'm currently working on the hdsp 9632 driver. This card supports sample
> rates up to 192kHz, including 128kHz and 176.4kHz. The problem is 128kHz
> sample rate seems to have been omited in <sound/pcm.h>. How am I supposed
> to deal with this ?
there are two ways:
1. define a new bit for 128k, and add to your rates field.
easy one but will affect others.
2. define your own hw_constraints.
add something like the following:
static unsigned int xxx_rates[] =
{ 32000, 44100, ....., 128000, 176400, 192000 };
static snd_pcm_hw_constraint_list_t xxx_hw_const_rates = {
.count = ARRAY_SIZE(xxx_rates),
.list = xxx_rates,
};
and in the open callback of pcm:
static int snd_xxx_pcm_open(snd_pcm_substream_t *substream)
{
....
snd_pcm_hw_constraint_list(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
&xxx_hw_const_rates);
....
}
then add SNDRV_PCM_RATE_KNOT to rates field, which indicates the
unconventional rates are supported.
well, i would take the latter :)
ciao,
Takashi
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