Re: No support for 128kHz sample rate ?

[Takashi Iwai <tiwai@suse.de>]

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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