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Original commit message from CVS: * sys/v4l2/gstv4l2src.c: * sys/v4l2/v4l2src_calls.c: When probing the formats and sizes a camera supports, make sure the best ones (highest resolution, prefered format) end up at the beginning of the probed caps and the less desirable ones at the end. This is important because the order within the caps matters for things like fixation and negotiation, ie. what format is chosen in the end. With recent kernels, the current probing code will end up querying the supported sizes from lowest resolution to highest resolution, adding them to the probed caps in that order, resulting to v4l2src fixating to the lowest possible resolution if downstream does not express a size preference. Also make up a somewhat random ranking of prefered output formats for the same reason. Fixes #485828. |
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| .. | ||
| .gitignore | ||
| gstv4l2.c | ||
| gstv4l2colorbalance.c | ||
| gstv4l2colorbalance.h | ||
| gstv4l2object.c | ||
| gstv4l2object.h | ||
| gstv4l2src.c | ||
| gstv4l2src.h | ||
| gstv4l2tuner.c | ||
| gstv4l2tuner.h | ||
| gstv4l2vidorient.c | ||
| gstv4l2vidorient.h | ||
| gstv4l2xoverlay.c | ||
| gstv4l2xoverlay.h | ||
| Makefile.am | ||
| README | ||
| v4l2_calls.c | ||
| v4l2_calls.h | ||
| v4l2src_calls.c | ||
| v4l2src_calls.h | ||
v4l2 plugins
============
The idea is a bit the same as the idea for the v4l1 plugins. We want
one generic v4l2element, and a few child objects (probably only two:
v4l2src and v4l2sink):
/-------- v4l2src
v4l2element ---=
\-------- v4l2sink
Both v4l2src and v4l2sink have a uncompressed and a compressed
recording-/playback-mode. Since this is all part of v4l2, the 'client'
of these elements, i.e. an application using v4l2src/v4l2sink, will
hardly notice this. All capsnego stuff is done inside, and the plugin
knows which formats are compressed and which are not.
Please note that the v4l1 and the v4l2 plugins are *not* compatible
concerning properties. Naming has been kept the same where possible,
but in some cases, properties had to be removed or added to make
full use of v4l2.
V4L2 API: http://linux.bytesex.org/v4l2/.
http://v4l2spec.bytesex.org/
/usr/include/linux/videodev2.h or
Kernel patches available from
http://dl.bytesex.org/patches/.
Articles:
http://lwn.net/Articles/203924/