[libcamera-devel] [PATCH 12/15] v4l2: v4l2_camera_proxy: Add sequence number

[Paul Elder]

Populate the sequence number field in the V4L2 buffers. Reset upon
streamon.

Signed-off-by: Paul Elder <paul.elder at ideasonboard.com>
---
 src/v4l2/v4l2_camera_proxy.cpp | 4 +++-
 src/v4l2/v4l2_camera_proxy.h   | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/v4l2/v4l2_camera_proxy.cpp b/src/v4l2/v4l2_camera_proxy.cpp
index 079961a..81f9282 100644
--- a/src/v4l2/v4l2_camera_proxy.cpp
+++ b/src/v4l2/v4l2_camera_proxy.cpp
@@ -33,7 +33,7 @@ LOG_DECLARE_CATEGORY(V4L2Compat);
 V4L2CameraProxy::V4L2CameraProxy(unsigned int index,
 				 std::shared_ptr<Camera> camera)
 	: refcount_(0), index_(index), bufferCount_(0), currentBuf_(0),
-	  vcam_(std::make_unique<V4L2Camera>(camera)), efd_(-1),
+	  sequence_(0), vcam_(std::make_unique<V4L2Camera>(camera)), efd_(-1),
 	  v4l2RecordPriorityFd_(-1), acquiredFd_(-1), initialized_(false),
 	  streaming_(false)
 {
@@ -665,6 +665,7 @@ int V4L2CameraProxy::vidioc_dqbuf(int fd, struct v4l2_buffer *arg)
 
 	buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
 	buf.length = sizeimage_;
+	buf.sequence = sequence_++;
 	*arg = buf;
 
 	currentBuf_ = (currentBuf_ + 1) % bufferCount_;
@@ -696,6 +697,7 @@ int V4L2CameraProxy::vidioc_streamon(int fd, int *arg)
 
 	currentBuf_ = 0;
 	streaming_ = true;
+	sequence_ = 0;
 
 	return vcam_->streamOn();
 }
diff --git a/src/v4l2/v4l2_camera_proxy.h b/src/v4l2/v4l2_camera_proxy.h
index 28b2fa0..1d8e9a6 100644
--- a/src/v4l2/v4l2_camera_proxy.h
+++ b/src/v4l2/v4l2_camera_proxy.h
@@ -82,6 +82,8 @@ private:
 	unsigned int currentBuf_;
 	unsigned int sizeimage_;
 
+	uint32_t sequence_;
+
 	std::vector<struct v4l2_buffer> buffers_;
 	std::map<void *, unsigned int> mmaps_;
 
-- 
2.27.0