At Sun, 05 Jul 2009 09:03:23 -0300, Guilherme Longo wrote: > > Hi all! > > I came across a doubt regarding the the access mode between application > and PCM device. > It is a hardware parameter related property and there are 5 different > types available: > > SND_PCM_ACCESS_MMAP_INTERLEAVED > SND_PCM_ACCESS_MMAP_NONINTERLEAVED > SND_PCM_ACCESS_MMAP_COMPLEX > SND_PCM_ACCESS_RW_INTERLEAVED > SND_PCM_ACCESS_RW_NONINTERLEAVED > > taking in account that these first 3 parameters has direct communication > with the memory, that means a higher speed operation? Yes. The others are using copy_from/to_user(), so there are slight overheads by explicit copying. > And the fact of > the interleaved has all the samples mixed together , makes any > difference in performance in comparison to the noninterleaved that has > samples stored on different buffers? No. It's just a difference of what format the hardware supports. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
