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libcamera: v4l2_videodevice: Empty the V4L2 buffer cache on streamOff()

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When streamOff() is called, ensure the cache entries for the remaining queued
buffers are freed since this will not happen via the dequeueBuffer() mechanism.

Additionally, add a V4L2BufferCache::isEmpty() function and assert that the
cache is empty at the end of the streamOff() call.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Tested-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Naushir Patuck 2022-03-25 09:09:02 +00:00 • committed by Laurent Pinchart
parent 1fb71a6ffa
commit 5704856681
2 changed files with 17 additions and 0 deletions
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include/libcamera/internal/v4l2_videodevice.h
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@ -124,6 +124,7 @@ public:
V4L2BufferCache(const std::vector<std::unique_ptr<FrameBuffer>> &buffers);
~V4L2BufferCache();
bool isEmpty() const;
int get(const FrameBuffer &buffer);
void put(unsigned int index);