This patch series adds support for configuration stores to the control framework. This allows you to store control values for a particular configuration (up to VIDEO_MAX_FRAME configuration stores are currently supported). When you queue a new buffer you can supply the store ID and the driver will apply all controls for that configuration store.
When you set a new value for a configuration store then you can choose whether this is 'fire and forget', i.e. after the driver applies the control value for that store it won't be applied again until a new value is set. Or you can set the value every time that configuration store is applied. The first 7 patches add support for this in the API and in v4l2-ctrls.c. Patch 8 adds configure store support for the contrast control in the vivid driver. Patches 9-11 add support for crop/compose controls to v4l2-ctrls and vivid as a proof-of-concept. This allows you to play around with things like digital zoom by manipulating crop and compose rectangles for specific buffers. It's basically a hack just to allow me to test this so don't bother reviewing these last three patches. This patch series is available here: http://git.linuxtv.org/cgit.cgi/hverkuil/media_tree.git/log/?h=confstore A patched version of qv4l2 and v4l2-ctl that add config store support is available here: http://git.linuxtv.org/cgit.cgi/hverkuil/v4l-utils.git/log/?h=confstore The easiest way to test this is with vivid. Load vivid, then run the patched qv4l2. This will associate every queued buffer with a corresponding config store. There are 4 buffers, so stores 1-4 are available for use. You can change the contrast value for a buffer as follows: v4l2-ctl --store=1 -c contrast=90 For a fire-and-forget you add the --ignore-after-use option: v4l2-ctl --store=1 -c contrast=90 --ignore-after-use So you can cycle between different contrast values as follows: v4l2-ctl --store=1 -c contrast=90 v4l2-ctl --store=2 -c contrast=100 v4l2-ctl --store=3 -c contrast=110 v4l2-ctl --store=4 -c contrast=120 This patch series and the API enhancements will be discussed during the upcoming media workshop. Regards, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
