Hello List, This is my first post and I am new (a couple of weeks) to ALSA.
I am working on an application that plays audio output in response to audio input --- the relationship between input and output is complicated and I will not describe it in any detail here --- I am building a musical accompaniment system. I want the output to "respond" to the input with low latency so I cannot write the output samples very long before they are actually going to be played. Currently I have a function that is called repeatedly (through a signal) and writes the samples about .05 secs before they will actually be played. I monitor the delay, in samples, (I can't remember the name of the function (snd_delay_???) and see that the number of unplayed samples fluctuates but there does not seem to be an increasing or decreasing trend. So I assume that I am writing at very close to the right rate and mostly the playback sounds fine. But every so often, maybe once every 10 secs or so, I get a playback underrun. I always check the system clock when my writing routine begins, so I know the underruns are almost always *not* due to my writing routine getting a late callback. By everything I can measure, the samples are written on time. Can anyone tell me what I need to do to fix this problem? Perhaps it is not reasonable of me to hope to write samples such a short time before they need to be played? I would really appreciate any help I can get on this and will supply any relevant details. I just didn't want to clutter up my question with lots of irrelevant info. Thanks, Christopher Raphael ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
