libcamera: camera: Add support for stream usages

Instead of requesting the default configuration for a set of streams
where the application has to figure out which streams provided by the
camera is best suited for its intended usage, have the library figure
this out by using stream usages.

The application asks the library for a list of streams and a suggested
default configuration for them by supplying a list of stream usages.
Once the list is retrieved the application can fine-tune the returned
configuration and then try to apply it to the camera.

Currently no pipeline handler is prepared to handle stream usages but
nor did it make use of the list of Stream IDs which was the previous
interface. The main reason for this is that all cameras currently only
provide one stream each. This will still be the case but the API will be
prepared to expand both pipeline handlers and applications to support
streams usages.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/src/libcamera/pipeline_handler.cpp b/src/libcamera/pipeline_handler.cpp
index 1a858f26..0574f990 100644
--- a/src/libcamera/pipeline_handler.cpp
+++ b/src/libcamera/pipeline_handler.cpp
@@ -152,13 +152,13 @@ PipelineHandler::~PipelineHandler()
  * \fn PipelineHandler::streamConfiguration()
  * \brief Retrieve a group of stream configurations for a specified camera
  * \param[in] camera The camera to fetch default configuration from
- * \param[in] streams An array of streams to fetch information about
+ * \param[in] usages A list of stream usages
  *
  * Retrieve the species camera's default configuration for a specified group of
- * streams. The caller shall populate the \a streams array with the streams it
- * wish to fetch the configuration from. The map of streams and configuration
- * returned can then be examined by the caller to learn about the defualt
- * parameters for the specified streams.
+ * use-cases. The caller shall populate the \a usages array with the use-cases it
+ * wishes to fetch the default configuration for. The map of streams and
+ * configurations returned can then be examined by the caller to learn about
+ * the default parameters for the specified streams.
  *
  * The intended companion to this is \a configureStreams() which can be used to
  * change the group of streams parameters.