Hi Joonas,
On Fri, 18 Feb 2011 02:30:49 am ext Joonas Tanskanen wrote:
> Hi
>
>
> I have some questions for Camera API maintainers.
>
> I found that Camera API doesn't provide way to set viewfinder resolution or
> preview image resolution. Do you have any plans to add support for these
> features? We need these features for reference camera application which I am
> implementing for meego handset platform. I thought that maybe I could add
> support for these features by myself.
>
It's useful to specify the viewfinder and image preview resolutions, but the
supportes (and efficiently supported)
set of resolutions is likely to be limited, it's not very clear how to express
such limitations in QCamera APIs.
For example in video recording mode the capture resolution/rate matches the
viefinder one.
One possible solution to have this feature supported right now is to
add extra properties to QCameraControl (viewfinderResolution/rate) and
QCameraImageCapture (preview resolution property) of camerabin backend.
It's possible to do without breaking BC and find what is necessary/suitable
and quite easy to implement on backend side.
>
> My plan is following:
>
>
> 1. add new methods to QCameraImageCapture for setting preview image
> resolution and viewfinder resolution:
>
>
> QImageEncoderSettings previewSettings() const;
> void setPreviewSettings(const QImageEncoderSettings& settings);
>
> QVideoEncoderSettings viewfinderSettings() const;
> void setViewfinderSettings(const QVideoEncoderSettings& settings);
>
>
>
> 2. Implement QMediaControl plugins QCameraViewfinderControl and
> QCameraViewfinderControl. These are used to transfer preview image and
> viewfinder settings to camera backend.
>
>
>
> 3. Modify CameraBinSession to set preview and viewfinder caps to camerabin.
>
>
>
> I am able to implement support for camerabin backend only. In case of other
> backends(s60, mediacapture) setPreviewSettings() and setViewfinderSettings()
> would do nothing. Is that a problem?
It's important to ensure the suitable resolutions is selected when no
viewfinder/preview settings are set.
> If I implement this change and make a submit request will it be accepted? We
> need to resolve this problem somehow for MeeGo handset camera UI and I
> thought that with same effort I could make general solution for this.
> If API change required by this is not acceptable we have to consider to
> implement some kind of meego only solution which doesn't change public API.
The API changes should be discussed, since they can't be changes once released,
so in the short run it's probably worth to
expose a few extra properties of QCameraControl and QCameraImageCapture, and
desing the related changes to API once
the applications requirements and limitations or expected target platforms are
more clear.
I'm thinking about extending QCamera API to provide more captured image related
metadata (like exposure settings, histogram, etc),
preview resolution could be part of those setttings as well.
Regards
Dmytro.
>
> Any comments are welcome, especially from Camera API maintainers :)
>
>
> Br,
>
> Joonas
>
>
>
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