>> My Wavelength Proton USB DAC works with the "default" device and with >> "plughw:0,0", but it does not work with "hw:0,0". I get the following >> error: >> >> output: Failed to open "Wavelength Proton" [alsa]: ALSA device >> "hw:0,0" does not support format 16: Invalid argument >> >> When trying to play a 24-bit file instead of 16-bit, "16:" is replaced >> by "24:" in the error message. The DAC supports 16-bit and 24-bit >> audio, and the manufacturer has assured me that it enumerates with >> Windows and Mac without error. Does this look like an ALSA bug? > > The device likely only supports one specific sample format (maybe S32_LE or I know it works with S24_3LE. > something). Whatever app you're using likely is using a different sample > format. Using the hw device you get no automatic conversion at all, if the > sample format doesn't match what the device requires it will fail. > > This is why one usually wants to use plughw devices or the default device in > applications, since they don't want to be bothered with the details of what > sample formats the device supports and those devices will do automatic > conversion if needed. I'm trying to avoid having the computer make any changes to the digital audio signal whatsoever. I don't use a software mixer, replaygain, etc. It sounds like using plughw or the default device causes conversions to take place. How can I send unaltered digital audio to the DAC? - Grant ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
