Re: [alsa-devel] Requiring the same sample rate for playback and record?

Takashi Iwai wrote:

In a simple case, you don't need hw_constraint functions. Just override the corresponding fields of runtime->hw in open callback.

For example, pci/via82xx.c sets the current rate value to runtime->hw.rate_min/max if there is another stream.

Are you talking about this code:

} else { /* a fixed rate */ runtime->hw.rates = SNDRV_PCM_RATE_KNOT; runtime->hw.rate_max = runtime->hw.rate_min = ratep->rate; }

Last I heard, ASoC doesn't work with SNDRV_PCM_RATE_KNOT. But I think I can still use this method. I'll just need to use a real SNDRV_PCM_RATE_xxx value.