Thank you. Can I use .ack callback to know that the mmaped buffer has been filled by the user? How would I know how much the user has written into the buffer that time? Would I need to have the pointers calculated and tracked myself or is there a field in the structures that I can read and find out? -----Original Message----- From: Takashi Iwai [mailto:tiwai@xxxxxxx] Sent: Monday, February 23, 2009 8:57 PM To: Harsha, Priya Cc: alsa-devel@xxxxxxxxxxxxxxxx Subject: Re: clarification on mmap At Mon, 23 Feb 2009 18:59:11 +0530, Harsha, Priya wrote: > > Hi, > > I have a question on mmap. If I give my .info to be _MMAP and > _MMAP_VALID. Will ALSA framework internally take care of mmap-ing > the kernel buffer that has been pre-allocated in the .probe call? Do > I need to do anything special to mmap a kernel buffer into user > space? Just accessing the runtime->dma_area would allow me to access > user data right? Yes. The buffers allocated via preallocator are supposed to be mmappable, so you can simply pass _MMAP* flag there. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
