gstreamer/sys/v4l/TODO
Ronald S. Bultje 6ba3abb3a5 Some final fixes for the v4lsrc elements. remove software sync thread (use GST_ELEMENT_THREAD_SUGGESTED instead) make...
Original commit message from CVS:
Some final fixes for the v4lsrc elements.

* remove software sync thread (use GST_ELEMENT_THREAD_SUGGESTED instead)
* make all src elements threadsafe
* fix num_buffer argument setting in v4l2src (VIDIOC_S_PARM)
* re-add bufsize (RO) for v4lmjpegsrc
* fix the A/V sync calculation in all elements (spvf=GST_SECOND/fps, not GST_SECOND*fps)
* probably some more crap....

With all this, it actually works quite well. The TODO files describes the
next steps in order to make a full-featured video recorder based on these
elements and GStreamer (bottom). Making a simple recorder should be fairly
easy now, btw.
2003-05-21 06:33:18 +00:00

42 lines
1.6 KiB
Text

TODO list (short term):
=======================
* v4lsrc/v4lmjpegsrc/v4l2src: fix interlacing (not handled at all...)
TODO list (long term):
======================
* v4lmpegsrc (*hint* MPEG card needed *hint*)
* v4l2sink
* BSD-videosrc (bktr)
* color correction (brightness, hue, etc.)
* gamma correction
Useful Documentation:
=====================
MJPEG/V4L API : ./videodev_mjpeg.h
Linux/V4L API : /usr/include/linux/videodev.h or
http://roadrunner.swansea.uk.linux.org/v4l.shtml
Linux/V4L2 API: /usr/include/linux/videodev2.h or
http://www.thedirks.org/v4l2/
(kernel patches: http://bytesex.org/patches/)
BSD/Meteor API: /usr/include/machine/ioctl_meteor.h
mjpegtools : http://www.sourceforge.net/projects/mjpeg
Capturing:
==========
* sound is the master clock
* it's probably a good idea to create an audiosource element:
- autodetect alsa/oss
- first try alsa, then oss... they work the same internally
* same for videosource:
- autodetect v4l/v4l2 + mjpeg capabilities
- for this, just open device using v4l2element. On success:
+ use v4l2
- on failure:
+ use v4lelement and query for MJPEG capabilities
+ if that's available, combine caps of v4lmjpegsrc and v4lsrc
* both sources run in their own GstThread with a high priority
* an encoder element takes care of encoding + muxing. A toplevel element
(reverse of spider) is probably a good idea here. How? Don't know...
* format negotiation via filtered caps
* statistics via listening to the frame_{lost,inserted,deleted,captures}
signals and GST_PAD_QUERY_POSITION (gst_pad_query())