libcamera: stream: Add and use toString() method to StreamConfiguration

Add a toString() method to the StreamConfiguration class, and replace
all manually coded implementations through the source code.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

src/libcamera/stream.cpp

@@ -5,6 +5,9 @@
  * stream.cpp - Video stream for a Camera
  */
 
+#include <iomanip>
+#include <sstream>
+
 #include <libcamera/stream.h>
 
 /**
@@ -60,6 +63,22 @@ namespace libcamera {
  * \brief Requested number of buffers to allocate for the stream
  */
 
+/**
+ * \brief Assemble and return a string describing the configuration
+ *
+ * \return A string describing the StreamConfiguration
+ */
+std::string StreamConfiguration::toString() const
+{
+	std::stringstream ss;
+
+	ss.fill(0);
+	ss << width << "x" << height << "-0x" << std::hex
+	   << std::setw(8) << pixelFormat;
+
+	return ss.str();
+}
+
 /**
  * \class StreamUsage
  * \brief Stream usage information