Hi all, I have a question about the period we set in hw_params. I found different boards may have different explanations about it. I have two guesses about its meaning. 1. The period_size is the size of each hardware's consumption. If we set period size to N, the pcm will consume N frames each time. 2. The period_size is the size to control when hardware call interrupt. If we set period size to N, the pcm consume frames in its step. When the number of frames it consumes more than N, it will call interrupt. We can use snd_pcm_avail function to check the real available frames in the device. If guess 1 is correct, the size of consumption should be fixed. Else, setting period_size is nothing to do with hardware's consumption. I've checked some boards and found that each board has different behavior (Most of them meet guess 2). I'm confuse which one is correct. Thanks! _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
