> 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 :)
>
>
Thanks,
I reported this because I thought 128kHz was somehow conventional, but I'm
ok with the hw_constraints method.
Thomas
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