[libcamera-devel] [SimpleCam PATCH 1/2] simple-cam: processRequest: Report timestamp and enhance description
Kieran Bingham
kieran.bingham at ideasonboard.com
Wed Feb 16 13:35:43 CET 2022
Report the timestamp of the completed buffers when the processRequest()
call handles a request and improve the description to discuss more of
the operations that can be done here.
Signed-off-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
---
simple-cam.cpp | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/simple-cam.cpp b/simple-cam.cpp
index 71a715a0c27d..e282463c3976 100644
--- a/simple-cam.cpp
+++ b/simple-cam.cpp
@@ -46,8 +46,17 @@ static void requestComplete(Request *request)
static void processRequest(Request *request)
{
+ /*
+ * Each buffer has its own FrameMetadata to describe its state, or the
+ * usage of each buffer. While in our simple capture we only provide one
+ * buffer per request, a request can have a buffer for each stream that
+ * is established when configuring the camera.
+ *
+ * This allows a viewfinder and a still image to be processed at the
+ * same time, or to allow obtaining the RAW capture buffer from the
+ * sensor along with the image as processed by the ISP.
+ */
const Request::BufferMap &buffers = request->buffers();
-
for (auto bufferPair : buffers) {
// (Unused) Stream *stream = bufferPair.first;
FrameBuffer *buffer = bufferPair.second;
@@ -55,6 +64,7 @@ static void processRequest(Request *request)
/* Print some information about the buffer which has completed. */
std::cout << " seq: " << std::setw(6) << std::setfill('0') << metadata.sequence
+ << " timestamp: " << metadata.timestamp
<< " bytesused: ";
unsigned int nplane = 0;
--
2.32.0
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