cam: Cache buffer memory mapping

With the buffer allocator in use it's possible to cache the dmabuf
memory mappings when starting the camera instead of mapping and
unmapping them each time.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/cam/buffer_writer.h b/src/cam/buffer_writer.h
index 5917a7df..8c9b2436 100644
--- a/src/cam/buffer_writer.h
+++ b/src/cam/buffer_writer.h
@@ -7,6 +7,7 @@
 #ifndef __LIBCAMERA_BUFFER_WRITER_H__
 #define __LIBCAMERA_BUFFER_WRITER_H__
 
+#include <map>
 #include <string>
 
 #include <libcamera/buffer.h>
@@ -15,12 +16,16 @@ class BufferWriter
 {
 public:
 	BufferWriter(const std::string &pattern = "frame-#.bin");
+	~BufferWriter();
+
+	void mapBuffer(libcamera::FrameBuffer *buffer);
 
 	int write(libcamera::FrameBuffer *buffer,
 		  const std::string &streamName);
 
 private:
 	std::string pattern_;
+	std::map<int, std::pair<void *, unsigned int>> mappedBuffers_;
 };
 
 #endif /* __LIBCAMERA_BUFFER_WRITER_H__ */