It only offers one metric for now, "dssim", available if
https://github.com/pornel/dssim was installed on the system
at the time the plugin was compiled.
The spearman correlation for dssim against the TID2008 dataset
is 0.81, against 0.70 for the old ssim implementation, and
it runs 15 times faster.
https://bugzilla.gnome.org/show_bug.cgi?id=751324
Simplify the PKG_CHECK_MODULES related to Wayland to avoid the confusion
of NOT_FOUND cases when there are 3 nested checks. Group those 3 checks
together since there are no conditions specific to each one.
Thanks to https://ci.gstreamer.net/ for alerting of the problem.
https://bugzilla.gnome.org/show_bug.cgi?id=773927
If the NOT_FOUND part of the check PKG_CHECK_MODULES is not written, it
defaults to error. Addind the else clause of this check as
HAVE_WAYLAND="no"
https://bugzilla.gnome.org/show_bug.cgi?id=773927
- xcb is supposedly thread-safe!
videotestsrc ! glimagesink now doesn't spuriously result in a
'call XInitThreads()' error however if anybody else is using X11,
then XInitThreads() still needs to be called and multiple glimagesink's
still need XInitThreads().
Everything still takes libX11 handles as they are compatible with the xcb
variants. Unfortunately we cannot move fully over to xcb due to GLX being
entirely based on Xlib. It's also impossible to transform a xcb_connection
to a Display which means we require X11 handles.
ttml was recently added but it won't compile unless libxml2 version 2.9.2
or later is available. In that version the first parameter of xmlGetProp
switched to being a const. In previous versions the compiler complains
about passing a const value to a non const argument.
Compiler would complain about include directory that didn't
exist because QPA_INCLUDE_PATH gets subst-ed regardless
(and if it didn't we'd have just an empty -I argument).
https://bugzilla.gnome.org/show_bug.cgi?id=767553
This DSP library can be used to enhance voice signal for real time
communication call. In implements multiple filters like noise reduction,
high pass filter, echo cancellation, automatic gain control, etc.
The webrtcdsp element can be used along, or with the help of the
webrtcechoprobe if echo cancellation is enabled. The echo probe should
be placed as close as possible to the audio sink, while the DSP is
generally place close to the audio capture. For local testing, one can
use an echo loop pipeline like the following:
autoaudiosrc ! webrtcdsp ! webrtcechoprobe ! autoaudiosink
This pipeline should produce a single echo rather then repeated echo.
Those elements works if they are placed in the same top level pipeline.
https://bugzilla.gnome.org/show_bug.cgi?id=767800
The dc1394src is a PushSrc element for IIDC cameras based on libdc1394.
The implementation from the 0.x series is deffective:
caps negotiation does not work, and some video formats
provided by the camera are not supported.
Refactor the code to port it to 1.X and enhance the support
for the full set of video options of IIDC cameras:
- The IIDC specification includes a set of camera video modes
(video format, frame size, and frame rates).
They do not map perfectly to Gstreamer formats, but those that
do not match are very rare (if used at all by any camera).
In addition, although the specification includes a raw format,
some cameras use mono video formats to capture in Bayer format.
Map corresponding video modes to Gstreamer formats in capabilities,
allowing both gray raw and Bayer video formats for mono video modes.
- The specification includes scalable video modes (Format7),
where the frame size and rate can be set to arbitrary values
(within the limits of the camera and the bus transport).
Allow the use of such mode, using the frame size and rate
from the negotiatied caps, and set the camera frame rate
adjusting the packet size as in:
<http://damien.douxchamps.net/ieee1394/libdc1394/faq/#How_do_I_set_the_frame_rate>
The scalable modes also allow for a custom ROI offset.
Support for it can be easily added later using properties.
- Camera operation using libdc1394 is as follows:
1. Enumerate cameras on the system and open the camera
identified the enumeration index or by a GUID (64bit hex code).
2. Query the video formats supported by the camera.
3. Configure the camera for the desired video format.
4. Setup the capture resources for the configured video format
and start the camera transmission.
5. Capture frames from the camera and release them when not used.
6. Stop the camera transmission and clear the capture resources.
7. Close the camera freeing its resources.
Do steps 2 and 3 when getting and setting the caps respectively.
Ideally 4 and 6 would be done when going from PAUSED to PLAYING
and viceversa, but since caps might not be set yet, the video mode
is not properly configured leaving the camera in a broken state.
Hence, setup capture and start transmission in the set caps method,
and consequently clear the capture and stop the transmission
when going from PAUSED to READY (instead of PLAYING to PAUSED).
Symmetrycally, open the camera when going from READY to PAUSED,
allowing to probe the camera caps in the negotiation stage.
Implement that using the `start` and `stop` methods of `GstBaseSrc`,
instead of the `change-state` method of `GstElement`.
Stop the camera before setting new caps and restarting it again
to handle caps reconfiguration while in PLAYING (it has no effect
if the camera is not started).
- Create buffers copying the bytes of the captured frames.
Alternatively, the buffers could just wrap the bytes of the frames,
releasing the frame in the buffer's destroy notify function,
if all buffers were destroyed before going from PLAYING to PAUSED.
- No timestamp nor offset is set when creating buffers.
Timestamping is delegated to the parent class BaseSrc,
setting `gst_base_src_set_live` TRUE, `gst_base_src_set_format`
with GST_FORMAT_TIME and `gst_base_src_set_do_timestamp`.
Captured frames have a timestamp field with the system time
at the completion of the transmission of the frame,
but it is not sure that this comes from a monotonic clock,
and it seems to be left NULL in Windows.
- Use GUID and unit properties to select the camera to operate on.
The camera number used in version 0.X does not uniquely identify
the device (it depends on the set of cameras currently detected).
Since the GUID is 64bit identifier (same as MAC address),
handle it with a string property with its hexadecimal representation.
For practicality, operate on the first camera available if the GUID
is null (default) and match any camera unit number if unit is -1.
Alternatively, the GUID could be handed with an unsigned 64 bit
integer type property, using `0xffffffffffffffff` as default value
to select the first camera available (it is not a valid GUID value).
- Keep name `GstDc1394` and prefix `gst_dc1394` as in version 0.X,
although `GstDC1394Src` and `gst_dc1394_src` are more descriptive.
- Adjust build files to reenable the compilation of the plugin.
Remove dc1394 from the list of unported plugins in configure.ac.
Add the missing flags and libraries to Makefile.
Use `$()` for variable substitution, as many plugins do,
although other plugins use `@@` instead.
https://bugzilla.gnome.org/show_bug.cgi?id=763026
In OpenBSD there is no "actual" librt that programs can link with,
instead the system/base libc provides the functions one would
customarily find there.
https://bugzilla.gnome.org/show_bug.cgi?id=766441
