Hi, On 06/14/2011 04:01 AM, Mauro Carvalho Chehab wrote:
Hi Devin,I've made a few fixes for your alsa_stream.c, used on tvtime. They are at: http://git.linuxtv.org/xawtv3.git In particular, those are the more interesting ones: commit a1bb5ade5c2b09d6d6d624d18025f9e2c4398495 alsa_stream: negotiate the frame rate Without this patch, one of my em28xx devices doesn't work. It uses 32 k rate, while the playback minimal rate is 44.1 k. I've changed the entire frame rate logic, to be more reliable, and to avoid needing to do frame rate conversion, if both capture and playback devices support the same rate. commit 8adb3d7442b22022b9ca897b0b914962adf41270 alsa_stream: Reduce CPU usage by putting the thread into blocking mode This is just an optimization. I can't see why are you using a non-block mode, as it works fine blocking. commit c67f7aeb86c1caceb7ab30439d169356ea5b1e72 alsa_stream.c: use mmap mode instead of the normal mode Instead of using the normal way, this patch implements mmap mode, and change it to be the default mode. This should also help to reduce CPU usage.
hmm, does this include automatic fallback to read mode if mmap mode is not available, mmap mode does not work with a number of devices (such as pulseaudio's alsa plugin). Regards, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
