On Thu, Mar 05, 2015 at 09:39:17AM -0800, Robin _ wrote: > Hi All, > > I am working on an audio logger for a University radio station. The > idea is to log all data to disk, 24/7/365 without interruption. What > I am finding is that to record 1s of audio, it takes 1s of waiting, > plus a small additional bit of time to copy that audio into userspace, > about 1.8 ms on the system I am using. Therefore, in a day, I can not > record a full day of audio. I am not using the MMAP functions, which > I suppose might reduce that delay, if it is mostly caused by copying > the data. Hi, I'm not sure to understand the problem. While data's being copied from memory to disk, your sound card will be recording the next block of data to memory, so no samples are lost. > does anyone know of a readymade open source program for 24/7/365 > logging? > AFAICS, any program recording raw samples could do the job (arecord, sox, etc...) The problem is how to always keep available space on the filesystem. The simpler option would to record to a unix pipe and then store data into 1-day long files without closing the pipe (for instance with the dd utility). Then, from time to time move old files away to free space. HTH ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
