libcamera: pipeline: ipu3: Cancel unused buffers

When the CIO2 returns a cancelled buffer, we will not queue buffers
to the IMGU.

These buffers should be explicitly marked as cancelled to ensure
the application knows there is no valid metadata or frame data
provided in the buffer.

Provide a cancel() method on the FrameBuffer to allow explicitly
cancelling a buffer.

Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/src/libcamera/pipeline/ipu3/ipu3.cpp b/src/libcamera/pipeline/ipu3/ipu3.cpp
index 51446fcf..73306cea 100644
--- a/src/libcamera/pipeline/ipu3/ipu3.cpp
+++ b/src/libcamera/pipeline/ipu3/ipu3.cpp
@@ -1257,8 +1257,11 @@ void IPU3CameraData::cio2BufferReady(FrameBuffer *buffer)
 
 	/* If the buffer is cancelled force a complete of the whole request. */
 	if (buffer->metadata().status == FrameMetadata::FrameCancelled) {
-		for (auto it : request->buffers())
-			pipe_->completeBuffer(request, it.second);
+		for (auto it : request->buffers()) {
+			FrameBuffer *b = it.second;
+			b->cancel();
+			pipe_->completeBuffer(request, b);
+		}
 
 		frameInfos_.remove(info);
 		pipe_->completeRequest(request);