feli@xxxxxxxxxxxx wrote: > according to hda-verb, the supported capturing parameters are 16/20/24 > bits per sample These are the sample formats that are transmitted on the HDA bus. > Alsa-lib, on the other hand, claims that the supported formats (for > `hw:0,0` in this case) are S16LE and S32LE These are the sample formats that the HDA controller writes into memory, and that your application sees in the buffer. > I expected that ALSA returns something like: S16LE, S20LE, S24LE. S20 and S24 are smaller samples that are aligned at the least significant bit in the 32-bit memory word. This would make them harder to handle, and almost no DMA controller is stupid enough to use them. The 20- or 24-bit samples you get from HDA are aligned at the most significant bit, i.e., you can handle them like 32-bit values. If you really want to know how many bits are actually significant, call snd_pcm_hw_params_get_sbits() after you've set the hw params. Regards, Clemens _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
