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authorJacopo Mondi <jacopo@jmondi.org>2019-06-28 15:11:34 +0200
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2019-07-14 16:01:09 +0300
commit9ed9d9b3c1a5e6a51e1aa869c758458c57c1a0f1 (patch)
tree88b7d397bcbded92bfda1d11e43a42cf191a02e0 /src/cam/event_loop.cpp
parent689e8916caf11942286a1f1264e55dcb709d3939 (diff)
libcamera: stream: Map external buffers to indexes
Add and use an operation to assign to Buffer representing external memory locations an index at queueRequest() time. The index is used to identify the memory buffer to be queued to the video device once the buffer will be queued in a Request. In order to minimize relocations in the V4L2 backend, this method provides a best-effort caching mechanisms that attempts to reuse BufferMemory previously mapped to the buffer's dmabuf file descriptors, if any. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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