Reiner wrote: > I was astonished that a simple wav playback example does not exist. The alsa-lib package has test/pcm_min.c. > What should be used: > > snd_pcm_mmap_commit > (I think snd_pcm_mmap_writei is the same with an additional copy behind ?) snd_pcm_mmap_writei is the same as calling snd_pcm_mmap_begin, copying into the buffer, and calling snd_pcm_mmap_commit. > or snd_pcm_writei If you have to ask, use snd_pcm_writei. > I think mmap will have better performance, Only if the program generates samples on the fly and can write them directly to the buffer in a format supported by the hardware. If you already have the data in some buffer, copying it into the device's buffer with snd_pcm_writei or snd_pcm_mmap_writei is just as fast as when you copy it into the device's buffer by yourself. > but will it work with all soundcards? Not directly. ALSA has mmap emulation for cards that don't support it. And there are devices where only support mmap access is SND_PCM_ACCESS_MMAP_COMPLEX. > I'am also looking for a function to get the number of played frames. ALSA doesn't count them. This is nothing that a program couldn't do trivially by itself. HTH Clemens _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
