>I mentioned my ham radio realtime program with mmap >in a posting on 3. Oct and before. >It works now with ALSA 0.9.7 with AC97 and maybe some other cards, thanks!!! >With ESS ES1969 mmap(ibuf, isize, PROT_READ, MAP_FILE | MAP_SHARED | >MAP_FIXED, fd_audio, 0) >(and I tried also all other MAP_ options) it breaks with I / O error. >Do You know some help about mmap besides man,
IIRC, mmap with OSS doesn't work unless you use the LD_PRELOAD hack. this loads a library that intercepts all standard system calls and routes them through alsa-lib. your app will not run without this. why? mmap provides direct access to the DMA buffer of the hardware, and thus bypasses most of what alsa-lib does. ALSA does support such direct access, but not in the simplistic way that OSS provides. or can I do something with "Scatter Gather" in ALSA API, >or does it help if i work myself into JACK for this problem? >hints welcome, tnx!!! either use ALSA natively, or use JACK, or use the LD_PRELOAD hack. ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. SourceForge.net hosts over 70,000 Open Source Projects. See the people who have HELPED US provide better services: Click here: http://sourceforge.net/supporters.php _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
