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android: camera_request: Lifetime of a Camera3RequestDescriptor

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This commit provides a sketch regarding Camera3RequestDescriptor
which aids tracking each capture reuqest placed by the android
framework to libcamera HAL.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Umang Jain 2022-01-04 12:22:01 +05:30
parent bf0154697b
commit e68e0f1ed2
1 changed files with 88 additions and 0 deletions
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88
src/android/camera_request.cpp
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@ -18,6 +18,94 @@ using namespace libcamera;
*
* A utility class that groups information about a capture request to be later
* reused at request complete time to notify the framework.
*
*******************************************************************************
* Lifetime of a Camera3RequestDescriptor tracking a capture request placed by
* Android Framework
*******************************************************************************
*
*
* Android Framework
* │
* │ ┌──────────────────────────────────┐
* │ │camera3_capture_request_t │
* │ │ │
* │ │Requested output streams │
* │ │ stream1 stream2 stream3 ... │
* │ └──────────────────────────────────┘
* ▼
* ┌─────────────────────────────────────────────────────────────┐
* │ libcamera HAL │
* ├─────────────────────────────────────────────────────────────┤
* │ CameraDevice │
* │ │
* │ processCaptureRequest(camera3_capture_request_t request) │
* │ │
* │ - Create Camera3RequestDescriptor tracking this request │
* │ - Streams requiring post-processing are stored in the │
* │ pendingStreamsToProcess map │
* │ - Add this Camera3RequestDescriptor to descriptors' queue │
* │ CameraDevice::descriptors_ │
* │ │ ┌─────────────────────────┐
* │ - Queue the capture request to libcamera core ────────────┤►│libcamera core │
* │ │ ├─────────────────────────┤
* │ │ │- Capture from Camera │
* │ │ │ │
* │ │ │- Emit │
* │ │ │ Camera::requestComplete│
* │ requestCompleted(Request *request) ◄───────────────────────┼─┼──── │
* │ │ │ │
* │ - Check request completion status │ └─────────────────────────┘
* │ │
* │ - if (pendingStreamsToProcess > 0) │
* │ Queue all entries from pendingStreamsToProcess │
* │ else │ │
* │ completeDescriptor() │ └──────────────────────┐
* │ │ │
* │ ┌──────────────────────────┴───┬──────────────────┐ │
* │ │ │ │ │
* │ ┌──────────▼────────────┐ ┌───────────▼─────────┐ ▼ │
* │ │CameraStream1 │ │CameraStream2 │ .... │
* │ ├┬───┬───┬──────────────┤ ├┬───┬───┬────────────┤ │
* │ ││ │ │ │ ││ │ │ │ │
* │ │▼───▼───▼──────────────┤ │▼───▼───▼────────────┤ │
* │ │PostProcessorWorker │ │PostProcessorWorker │ │
* │ │ │ │ │ │
* │ │ +------------------+ │ │ +------------------+│ │
* │ │ | PostProcessor | │ │ | PostProcessor |│ │
* │ │ | process() | │ │ | process() |│ │
* │ │ | | │ │ | |│ │
* │ │ | Emit | │ │ | Emit |│ │
* │ │ | processComplete | │ │ | processComplete |│ │
* │ │ | | │ │ | |│ │
* │ │ +--------------│---+ │ │ +--------------│---+│ │
* │ │ │ │ │ │ │ │
* │ │ │ │ │ │ │ │
* │ └────────────────┼──────┘ └────────────────┼────┘ │
* │ │ │ │
* │ │ │ │
* │ │ │ │
* │ ▼ ▼ │
* │ +---------------------------------------+ +--------------+ │
* │ | CameraDevice | | | │
* │ | | | | │
* │ | streamProcessingComplete() | | | │
* │ | | | | │
* │ | - Check and set buffer status | | .... | │
* │ | - Remove post+processing entry | | | │
* │ | from pendingStreamsToProcess | | | │
* │ | | | | │
* │ | - if (pendingStreamsToProcess.empty())| | | │
* │ | completeDescriptor | | | │
* │ | | | | │
* │ +---------------------------------------+ +--------------+ │
* │ │
* └────────────────────────────────────────────────────────────────────────────────────┘
*
* +-------------+
* | | - PostProcessorWorker's thread
* | |
* +-------------+
*/
Camera3RequestDescriptor::Camera3RequestDescriptor(