Mensaje citado por Takashi Iwai <[EMAIL PROTECTED]>: > At Tue, 27 Apr 2004 20:36:29 +0200, > Juan Carlos Granda wrote: > > > > [1 <text/plain; iso-8859-1 (quoted-printable)>] > > > > [2 <text/html; iso-8859-1 (quoted-printable)>] > > Hi, > > > > I'm developing a Multi-thread app for capturing audio+video and i have a > few > > questions. The app is based on 3 threads: > > > > - 1 thread for capturing audio using ALSA lib. > > - 1 thread for capturing video using V4L2. > > - 1 thread for saving audio+video into an AVI file. > > > > Both of capturing threads store captured data into a queue and the last > thread picks > > the data and sync A/V. > > > > I start audio capturing and then the video. So, i need to known the point > of the > > stream of audio the video begins. > > I'm readings frames by period size times. My prob is how to get valid ALSA > timestamps > > to eliminate the previous frames of the period the video starts. I've > tried > > snd_pcm_status_get_trigger_tstamp but it returns the same timestamp for a > long period > > of time (13 secs) (is it related to the period or buffer time?). I've > tried > > snd_pcm_status_get_tstamp too but i obtain a delay of several microseconds > from the > > period time (50 - 100 more or less) (is it because the clock resolution?). > > the alsa-driver can put timestamp at each period update. > set SND_TSTAMP_MMAP in snd_pcm_sw_params_set_tstamp_mode(). > > > Takashi > >
I set SND_TSTAMP_MMAP like you told me. What function may i use? I've tried snd_pcm_status_get_trigger_tstamp and snd_pcm_status_get_tstamp, and the first always return the same timestamp or it changes every 4 or 6 seconds. And the second returns the "now" timestamp. What am i doing wrong? Could you explain me the all secuence to make it works? Thanl, Juan Carlos > ------------------------------------------------------- > This SF.Net email is sponsored by: Oracle 10g > Get certified on the hottest thing ever to hit the market... Oracle 10g. > Take an Oracle 10g class now, and we'll give you the exam FREE. > http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click > _______________________________________________ > Alsa-devel mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/alsa-devel > ------------------------------------------------- Este mensaje fue enviado utilizando el servicio Webmail de: http://www.telecable.es ------------------------------------------------------- This SF.Net email is sponsored by: Oracle 10g Get certified on the hottest thing ever to hit the market... Oracle 10g. Take an Oracle 10g class now, and we'll give you the exam FREE. http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
