James Courtier-Dutton wrote: > Eric Peters wrote: >> Dear all, >> >> I'm a bit confused by the alsa documentation. I want to fill up a buffer >> of a alsa device with snd_pcm_writei and then if the buffer is full, I >> want to be able to start the playback manually. By looking to the >> documentation, I found the method snd_pcm_sw_params_set_start_threshold. >> In some other messages on this list there was the hint to set this >> threshhold larger than the max_buffer_size and then the device shouldn't >> start automatically. So I've done. But unfortunately the playback starts >> again automatically. Here are the lines of code, I'm setting the >> buffer_size and period_size and the start threshhold: >> >> > Why would you actually want to do what you describe. (You certainly can > do it with ALSA, but as to why you would want to, is another thing > entirely) > It is normally better to get the buffers running, sending silence > samples to the buffer, and then introduce your sound when you want to. > One can accurately determine the delay or latency of the buffer, so > accurately timing samples is not a problem. > One uses a callback approach to send sound to the card. A good example > of this callback approach is an application called jackd. > http://jackaudio.org/ > > James > Thank you James for your answer, but unfortunately it isn't a real simple application. So it wouldn't be possible to start the device with silence samples. But I will take this approach into account to make it better. :-) Best regards, Eric ------------------------------------------------------------------------- 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 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
