Only access the preview location if it exists, to avoid acessing
a NULL variable. If the preview location list doesn't exist, it is
likely because the source has posted a preview message after camerabin2
has been put to READY.
The preview filename list is acessed whenever a new capture is started, when
camera-source posts a new preview message or on state changes. All of those can
occur simultaneously, so add a mutex to prevent concurrent access.
Makes camerabin2 intercept preview-image messages and add
the filename corresponding to the message structure in the
'location' field.
Makes easier for applications to track preview images
Setting the audio source to NULL just after pushing the EOS event
on it could potentially cause loss of said EOS event. Instead, we
can set the audio source to NULL when ready-for-capture is
signalled and the boolean value is true as this indicates we are
not currently capturing video.
An element stores the result for the last state change it did and
GstBin's state change handler will use this last result for state
locked elements to decide if its state change was successfull or not.
In camerabin2, the filesinks have their state locked and when they
fail switching states, this last failure will be used if the application
tries to change camerabin2's state, causing any state change to fail.
This patch makes camerabin2 reset this last change failure, avoiding
that camerabin2 fails on its next state changes.
Camerabin2 has a zoom property that is simply proxied to its
internal camera-source element. This patch makes camerabin2 listen
to 'notify' signals from it so it can update its zoom property value
when camera-source changes its zoom as a side-effect of another operation
or because the user set the zoom directly to it, instead of doing
it from camerabin2.
If we know that our camera source element produces buffers at the same
resolution and appropriate colourspace for the output, we don't need any
of the generic conversion elements in encodebin. This reduces caps
negotiation overheads among other things.
Reduce the viewfinder queue limits to only allow it to store
one buffer, preventing the queue from holding old buffers for
too long. This also avoids showing slightly outdated frames on
the viewfinder when the source has already produced new ones
and improves the buffer recycling rate, important for sources
that use bufferpools.
Basesrc derived classes send an eos when they change state
from paused to ready and that breaks video recordings on camerabin2
as it makes the whole audio branch pads flushing.
Prevent it by using a pad probe that only allows the eos to pass
when it is caused by a stop-capture action.
Capsfilters are created on the constructor and their properties can
be set/get from camerabin2's set/get_property functions. The user with
a broken setup would cause assertions when trying to set/get the
capture caps of this camerabin2.
A proper missing-plugin message will be posted when the user tries to
set camerabin2 to READY state.
Adds a property to add a custom GstElement to the audio
branch of the pipeline. This allows the user to do custom audio
processing/analysis when recording videos.
The audio source inside camerabin2 is put to READY and back to
PLAYING when starting capture, causing the pipeline to lose its
clock. As camerabin2 isn't put to PAUSED->PLAYING again during
this, a new clock isn't selected for elements.
A flags property has been added to encodebin to toggle whether the
conversion elements (ffmpegcolorspace, videoscale, audioconvert,
audioresample, audiorate) are created and linked into the appropriate
branches of encodebin.
Not including these elements avoids some slow caps negotiation and
allows the first buffers to flow through encodebin much more quickly.
However, it imposes that the uncompressed input is appropriate for the
target profile and elements selected to meet that profile.
If we bring the audio source up to the PAUSED state before emitting the
start-capture signal to the camera source, when subequently taking the
audio source to the PLAYING state, it will begin capture more quickly.
Since camerabin2 has switched to encodebin and encodebin has its own
queues and conversion elements, those preceding encodebin are no longer
necessary and as such can be removed.
Using a NULL string for location means that the application
doesn't want the image to be encoded, but wants to receive
the preview image. (Only works for image captures)
Useful for application that want the capture in memory only, like
displaying to the user before it choses to encode or take another
picture in avatar capturing scenarios.
https://bugzilla.gnome.org/show_bug.cgi?id=641918
The default for tagsetters is to use merge keep mode, so tags
would never be replaced and all captures would have the same tags.
This commit watches all elements added into encodebin and sets
all tagsetters to merge replace mode
Using serialized custom events for switching image capture saving
location makes camerabin2 save each capture correctly to the location
that was set during the moment start-capture was called, and not
the moment the filesink was writing to disk.
This prevents captures to be overwriten by racyness among start-capture
and setting location for images.
We only need to change the state of the filesink to switch its
saving location. This might still cause some problems of dropping
captured buffers, but it is better than changing the state of
the whole branch.
