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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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1
include/libcamera/internal/v4l2_videodevice.h
View file

@ -124,6 +124,7 @@ public:
V4L2BufferCache(const std::vector<std::unique_ptr<FrameBuffer>> &buffers); V4L2BufferCache(const std::vector<std::unique_ptr<FrameBuffer>> &buffers);
~V4L2BufferCache(); ~V4L2BufferCache();
bool isEmpty() const;
int get(const FrameBuffer &buffer); int get(const FrameBuffer &buffer);
void put(unsigned int index); void put(unsigned int index);

16
src/libcamera/v4l2_videodevice.cpp
View file

@ -201,6 +201,19 @@ V4L2BufferCache::~V4L2BufferCache()
LOG(V4L2, Debug) << "Cache misses: " << missCounter_; LOG(V4L2, Debug) << "Cache misses: " << missCounter_;
} }
/**
* \brief Check if all the entries in the cache are unused
*/
bool V4L2BufferCache::isEmpty() const
{
for (auto const &entry : cache_) {
if (!entry.free_)
return false;
}
return true;
}
/** /**
* \brief Find the best V4L2 buffer for a FrameBuffer * \brief Find the best V4L2 buffer for a FrameBuffer
* \param[in] buffer The FrameBuffer * \param[in] buffer The FrameBuffer
@ -1849,10 +1862,13 @@ int V4L2VideoDevice::streamOff()
for (auto it : queuedBuffers_) { for (auto it : queuedBuffers_) {
FrameBuffer *buffer = it.second; FrameBuffer *buffer = it.second;
cache_->put(it.first);
buffer->metadata_.status = FrameMetadata::FrameCancelled; buffer->metadata_.status = FrameMetadata::FrameCancelled;
bufferReady.emit(buffer); bufferReady.emit(buffer);
} }
ASSERT(cache_->isEmpty());
queuedBuffers_.clear(); queuedBuffers_.clear();
fdBufferNotifier_->setEnabled(false); fdBufferNotifier_->setEnabled(false);
state_ = State::Stopped; state_ = State::Stopped;