Hi Franz, Double buffering is up to u ;). Just get at least 2 Buffers from the driver, and use them one after another as a ringbuffer :). U could have more buffers, so u don't need to worry, if u need more time to process one picture.
Streaming is done, as long as u pass a buffer back to driver to fill it. No Buffer - no Streaming. Buffers are filled with continuing frames, so don't expect to dequeue 5 Buffers to get 5 (seperated) pics per second. This would produce just a line of 5 Pictures out of 25, not 5 Pictures with 4 Frames between them. U have to make the correct timing by urself to do that ;). Hope i could help u a little bit. Michael Am Donnerstag, 26. Juni 2003 11:27 schrieb Franz Reinhardt: > Hi, > > after looking through the code of bttv-0.9.10 and saa7134-0.2.7, I have > still some questions about streaming and reading the video resource. > > If I've understood it correctly, this is how it's done. > > Framebuffer ---------------------> System Memory (cacheable) > Video-Card DMA Transfer many buffers > (steered by interrupt) > > Do the driver use double buffering for the framebuffer to separate the > frames properly ? > > Is streaming done all the time, or does it stop after filling up all the > enqueued buffers ? > > TIA, > > Franz > > > > -- > video4linux-list mailing list > Unsubscribe mailto:[EMAIL PROTECTED] > https://www.redhat.com/mailman/listinfo/video4linux-list -- video4linux-list mailing list Unsubscribe mailto:[EMAIL PROTECTED] https://www.redhat.com/mailman/listinfo/video4linux-list
