Hello Takashi On Mo, Mär 23, 2009 at 11:07:15 +0100, Takashi Iwai wrote: > At Fri, 20 Mar 2009 09:28:02 +0000 (UTC), > Halim Sahin wrote: > > > > hello, > > > > I have asked this question to alsa user list but got no useful answer. > > > > I am a blind linux user and need asistive Technology to use my pc. > > The problem I have experienced with alsa is that it is sometimes too slow to stop > > previous output before starting a new one. > > The result of this ends in several speech outputs at a time. > > The problem only occurs if the dmix plugin is used. > > Could you elaborate how the previous output is stopped, and how the > next sample is started? Are they different processes, open/close > sequences, or snd_pcm_drop() / prepare / re-start, or what? It seems that the speech-server is using the following functions to handle sound output through alsa: snd_pcm_drop, snd_pcm_status..., snd_pcm_prepare, snd_pcm_resume .... The server can be found here: http://www.freebsoft.org/pub/projects/speechd/speech-dispatcher-0.6.7.tar.gz The alsa code can be found in file speechd_0.6.7/src/audio/alsa.c > It'd be best if you could show a small test-case program to reproduce > the problem... Please have a look to speech-dispatcher , which shows the problem. I can reproduce the mentioned problem with other apps as well like mplayer. mplayer -ao alsa *.mp3 During playback simply press right/left for forward/backward. This step uses dmix if it is enabled! Then try the same with: mplayer -ao alsa:device=hw=0.0 *.mp3 Please ask if you have more questions. I.ll be happy if we can find a working solution for the speech stuff. Thanks a lot for your response. Regards halim _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
