From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <45ABDAFF.606@xmission.com> Date: Mon, 15 Jan 2007 12:50:23 -0700 From: Brad Midgley MIME-Version: 1.0 To: BlueZ development References: <200701152010.54996.bluez-devel@huitl.de> In-Reply-To: <200701152010.54996.bluez-devel@huitl.de> Subject: Re: [Bluez-devel] a2dpd and mplayer - any chance to get it working? [resent] Reply-To: BlueZ development List-Id: BlueZ development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Sender: bluez-devel-bounces@lists.sourceforge.net Errors-To: bluez-devel-bounces@lists.sourceforge.net Robert > I was wondering whether it is possible to make the a2dp alsa plugin supply > correct audio timing to applications like MPlayer. Right now, MPlayer does > not work with a2dpd because it relies on the audio driver to report accurate > audio timing information (or something like that). > > If a2dpd could measure the delay introduced on the wireless transport, it > might be possible to supply timing information to media players. The player > could then sync the video to the audio data, so there should be no delay at > all between audio and video playback. > > Is there something I am missing? > What changes to the alsa plugin would be necessary? > > Even if the delay can't be determined exactly, we could just fake that > information MPlayer is missing, so that a2dpd at least worked together with > MPlayer (with a small delay, maybe)? we have a couple of things to address here. For one, the delay can change over time. It might be 250ms on startup but if I walk out of range and come back then all the transmission problems have caused it to go up to 400ms. Another is the delay likely varies from set to set. We could start with a guess like 300ms and see how that covers it. If lib alsa provides what we need, it's probably a snd_pcm_hw_params_set_* function to be invoked in a2dpd_output_alsa.c. Brad ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Bluez-devel mailing list Bluez-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bluez-devel