>> Does anyone have examples or documentation on how to configure periods, >> frames and buffers for various sample rates? I am writing a program to >> route a mp3 decoder output to ALSA on an ARM processor, and I get noisy >> audio. For a CD quality stream (S16_LE, 44100 kHz, Stereo, 128 bps) I am >> using an output buffer of 44100 bytes, a period of 44100/(channels*2). With >>Be careful about the distinction between bytes and frames (i.e. >>a frame of stereo S16 is 4 bytes) >Start with the period >1024 frames = 4096 bytes >then make your buffer at least 2x this: >8192 bytes > (I'm not an app developer, so others may jump in with a better >explanation) >Did you look at the code in alsa-lib/test? Thanks Eliot, I will try this buffer size. I did look at alsa tests, but I was not too convinced, as when I run those apps I still got plenty of short writes. Would someone please explain why do these 'short writes' occur? >> a buffer this big, I do not get underruns, but I do get all short writes. I >> have not been able to find the right configuration to avoid short writes, >> and more importantly, to get good quality audio. What do 'short writes' (I >> am using writei) really mean? Is this a performance issue in the driver, or > is mainly because of buffer setup? I would really appreciate any help with >> this. >> Magdalena _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
