How does streaming video capture work?
I ask the video device for 8 buffers using ioctl:VIDIOC_REQBUFS
then query for the addresses using ioctl:VIDIOC_QUERYBUF
and then mmap the addresses to say, data[0] - data[7] and
finally, use ioctl:VIDIOC_QBUF and ioctl:VIDIOC_STREAMON
to start the streaming capture.
Now the buffers start rolling in.
If I just render data[0], then it (looks like) I am rendering
every 8th frame. Should I:
1) render all 8 buffers,
then do another ioctl:VIDIOC_DQBUF;
repeat previous 2 lines.
2) render one frame (number i++ % 8),
then do another ioctl:VIDIOC_DQBUF;
repeat previous 2 lines.
3) something else?
Basically, I want to know what the contract between
ioctl:VIDIOC_DQBUF and the state of the buffers?
Thanks,
Bilal
_________________________________________________________________
Join the world?s largest e-mail service with MSN Hotmail.
http://www.hotmail.com
