mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-03 16:09:39 +00:00
6ba3abb3a5
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.
42 lines
1.6 KiB
Text
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())
|