>> Is there a definitive/safe way to monitor ALSA's write pointer in the >> dma_area? It seems like the ack callback and the appl_ptr is the >> correct way, but I was told by another developer that appl_ptr doesn't >> work in all cases. >> >> As a future optimization for my hardware, I may want to tell ALSA to use >> a specific area of physical memory for it's dma_area, what is the best >> way to do that? > > A good question. The ack callback is called only when the explicit > read/write method is used. When mmap access is used, it won't be > called. > > One hack would be to check appl_ptr in the pointer callback. This > callback is called in snd_pcm_hwsync(), too. So, if you watch the > appl_ptr change as frequently as possible, it'd be a good place for > that. > > Takashi Thanks. I'll try reading appl_ptr from within the pointer callback. Brian _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
