(please don't top-post) Amit Nagal wrote: > i used SNDCTL_DSP_GETBLKSIZE ioctl to find the fragment size of driver > . i found it to be 16k . > > 1) now if the application reads 4k data from userspace , read call > will remain blocked for audio driver's fragment size usb data read ( > 16k) > or app_request_size(4k) ? If, when read() is called, there is enough data in the buffer, it will return that data and return immediately. Otherwise, it will wait for the hardware to reach the next period boundary (in OSS: fragment boundary) and try again. If you want to have shorter waits, use lower fragment sizes. Regards, Clemens ------------------------------------------------------------------------------ Oracle to DB2 Conversion Guide: Learn learn about native support for PL/SQL, new data types, scalar functions, improved concurrency, built-in packages, OCI, SQL*Plus, data movement tools, best practices and more. http://p.sf.net/sfu/oracle-sfdev2dev _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
