Varadarajan, Srikanth wrote: > If we have one application using the hardware through ALSA, other > applications are unable to get access to it. So, we want to have > PulseAudio on top and use the pulse virtual device to render audio > through ALSA. Is this a recommended way of having multiple applications > access one audio HW simultaneously? Usually yes. > Is there any other way of handling multiple applications get access to > the same hardware? With ALSA's dmix plugin, but this requires that the hardware supports mmap, i.e., DMA to/from the main memory. > Also, why are mmap and munmap operations required in ALSA? They aren't, except for dmix. > Right now, we do not have mmap and munmap operations exposed. > Though the hardware constraints have "SNDRV_PCM_INFO_MMAP | > SNDRV_PCM_INFO_MMAP_VALID" defined. In most drivers, the buffer management, including mmap, is automatically handled by the ALSA framework. > If there is a close enough ALSA implementation in the current Linux > kernel that I can lookup, please point me to that. Close to what? What kind of buffer does your device use, DMA in main memory, memory-mapped device memory, or PIO? Regards, Clemens _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
