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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...)
Add some bugreport about spider+v4lsrc to TODO list (aka testing this CIA commit bot) Original commit message from CVS: Add some bugreport about spider+v4lsrc to TODO list (aka testing this CIA commit bot)
2003-06-01 20:55:38 +00:00
* fix v4l*src ! spider ! colorspace ! xvideosink
- first sets to PLAYING, then (re-)triggers capsnego - that breaks
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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