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libcamera: pipeline_handler: Decouple buffer import and export

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Use the V4L2 buffer orphaning feature, exposed through
V4L2VideoDevice::exportBuffers(), to decouple buffer import and export.
The PipelineHandler::importFrameBuffers() function is now called for all
streams regardless of whether exportFrameBuffers() has been called or
not. This simplifies the Camera implementation slightly, and opens the
door to additional simplifications.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
This commit is contained in:
Laurent Pinchart
2020-03-14 16:14:27 +02:00
parent 7d8604128a
commit 9da27d5d84
8 changed files with 10 additions and 54 deletions
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src/libcamera/pipeline/vimc.cpp
+1 -1
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@@ -264,7 +264,7 @@ int PipelineHandlerVimc::exportFrameBuffers(Camera *camera, Stream *stream,
VimcCameraData *data = cameraData(camera);
unsigned int count = stream->configuration().bufferCount;
return data->video_->allocateBuffers(count, buffers);
return data->video_->exportBuffers(count, buffers);
}
int PipelineHandlerVimc::importFrameBuffers(Camera *camera, Stream *stream)