On Tuesday 14 April 2009 15:33:04 ext Mark Brown wrote: > Many devices require symmetric configurations of capture and playback > data formats, often due to shared clocking but sometimes also due to > other shared playback and record configuration in the device. Start > providing core support for this by allowing the DAIs or the machine > to specify that the sample rates used should be kept symmetric. > > A flag symmetric_rates is provided in the snd_soc_dai and > snd_soc_dai_link structures. If this is set in either of the DAIs or in > the machine then a constraint will be applied when a stream is already > open preventing any changes in sample rate. > > + > + ret = snd_pcm_hw_constraint_minmax(substream->runtime, > + SNDRV_PCM_HW_PARAM_RATE, > + machine->rate, > + machine->rate); Would it make sense to add also the channel count and probably sample_bits as constraint as well here? I think the symmetric means that you should not be able to change any of the parameters. -- Péter _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
