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gstreamer/sys/v4l/TODO

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Added pthread software sync for improved timestamps and pthread queue and sync control to make sure that frames are q... Original commit message from CVS: Added pthread software sync for improved timestamps and pthread queue and sync control to make sure that frames are queued if we sync on them
2001-12-23 19:14:18 +00:00
TODO list (short term):
=======================
This patch fixes some issues caused by design issues in video4linux, adds some nicety to video4linux2 plugins and doe... Original commit message from CVS: This patch fixes some issues caused by design issues in video4linux, adds some nicety to video4linux2 plugins and does some more evil stuff: * video4linux doesn't tell us which formats are supported by a card, so the only way to know this is by simply trying it out. This patch adds that. * v4lmjpegsink didnt have a bufferpool yet - is integrated now. * all copy() bufferpool functions have been removed since they're not needed. * v4lmjpegsink doesnt have a free() function, because hen playing the frames, all this is already handled. When the frame is not played, nothing has to be done. In total, the function is not needed. * adds a get_caps() function to v4l2src * some minor crap
2002-09-20 09:28:46 +00:00
* v4lsrc/v4lmjpegsrc/v4l2src: fix interlacing (not handled at all...)
Added pthread software sync for improved timestamps and pthread queue and sync control to make sure that frames are q... Original commit message from CVS: Added pthread software sync for improved timestamps and pthread queue and sync control to make sure that frames are queued if we sync on them
2001-12-23 19:14:18 +00:00
TODO list (long term):
======================
And last but not least, update the TODO file Original commit message from CVS: And last but not least, update the TODO file
2002-02-04 19:47:37 +00:00
* v4lmpegsrc (*hint* MPEG card needed *hint*)
This patch fixes some issues caused by design issues in video4linux, adds some nicety to video4linux2 plugins and doe... Original commit message from CVS: This patch fixes some issues caused by design issues in video4linux, adds some nicety to video4linux2 plugins and does some more evil stuff: * video4linux doesn't tell us which formats are supported by a card, so the only way to know this is by simply trying it out. This patch adds that. * v4lmjpegsink didnt have a bufferpool yet - is integrated now. * all copy() bufferpool functions have been removed since they're not needed. * v4lmjpegsink doesnt have a free() function, because hen playing the frames, all this is already handled. When the frame is not played, nothing has to be done. In total, the function is not needed. * adds a get_caps() function to v4l2src * some minor crap
2002-09-20 09:28:46 +00:00
* v4l2sink
v4l plugins: add open/close signals v4l2 plugins: add open/close signals move source format enumeration from v4l2elem... Original commit message from CVS: v4l plugins: * add open/close signals v4l2 plugins: * add open/close signals * move source format enumeration from v4l2element to v4l2src * adapt to the final v4l2 API in kernel 2.5 (patches for 2.4 on http://bytesex.org/patches) * small tweaks
2002-11-13 12:35:55 +00:00
* BSD-videosrc (bktr)
And last but not least, update the TODO file Original commit message from CVS: And last but not least, update the TODO file
2002-02-04 19:47:37 +00:00
* color correction (brightness, hue, etc.)
* gamma correction
Added pthread software sync for improved timestamps and pthread queue and sync control to make sure that frames are q... Original commit message from CVS: Added pthread software sync for improved timestamps and pthread queue and sync control to make sure that frames are queued if we sync on them
2001-12-23 19:14:18 +00:00
Useful Documentation:
=====================
MJPEG/V4L API : ./videodev_mjpeg.h
Small changes and integration of norm and input autodetection for mjpegv4lsrc Original commit message from CVS: Small changes and integration of norm and input autodetection for mjpegv4lsrc
2001-12-28 19:54:23 +00:00
Linux/V4L API : /usr/include/linux/videodev.h or
Added pthread software sync for improved timestamps and pthread queue and sync control to make sure that frames are q... Original commit message from CVS: Added pthread software sync for improved timestamps and pthread queue and sync control to make sure that frames are queued if we sync on them
2001-12-23 19:14:18 +00:00
http://roadrunner.swansea.uk.linux.org/v4l.shtml
v4l plugins: add open/close signals v4l2 plugins: add open/close signals move source format enumeration from v4l2elem... Original commit message from CVS: v4l plugins: * add open/close signals v4l2 plugins: * add open/close signals * move source format enumeration from v4l2element to v4l2src * adapt to the final v4l2 API in kernel 2.5 (patches for 2.4 on http://bytesex.org/patches) * small tweaks
2002-11-13 12:35:55 +00:00
Linux/V4L2 API: /usr/include/linux/videodev2.h or
http://www.thedirks.org/v4l2/
(kernel patches: http://bytesex.org/patches/)
Added pthread software sync for improved timestamps and pthread queue and sync control to make sure that frames are q... Original commit message from CVS: Added pthread software sync for improved timestamps and pthread queue and sync control to make sure that frames are queued if we sync on them
2001-12-23 19:14:18 +00:00
BSD/Meteor API: /usr/include/machine/ioctl_meteor.h
mjpegtools : http://www.sourceforge.net/projects/mjpeg
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
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())
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