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libcamera: v4l2_subdevice: Replace Routing::toString() with operator<<()

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The main (and only at the moment) use case for the Routing::toString()
function is to print a representation of the routing table in a log
message. The function is implemented using an std::stringstream, and the
returned std::string is then inserted into an std::ostream. This is
inefficient. Replace the function with a specialization of the
operator<<() and use it in the caller.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2024-02-26 16:02:40 +02:00
parent 0d2ad0cd84
commit e8f01b37e8
3 changed files with 18 additions and 20 deletions
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7
include/libcamera/internal/v4l2_subdevice.h
View file

@ -95,11 +95,7 @@ public:
unsigned int stream;
};
class Routing : public std::vector<struct v4l2_subdev_route>
{
public:
std::string toString() const;
};
using Routing = std::vector<struct v4l2_subdev_route>;
explicit V4L2Subdevice(const MediaEntity *entity);
~V4L2Subdevice();
@ -178,5 +174,6 @@ static inline bool operator!=(const V4L2Subdevice::Stream &lhs,
}
std::ostream &operator<<(std::ostream &out, const V4L2Subdevice::Stream &stream);
std::ostream &operator<<(std::ostream &out, const V4L2Subdevice::Routing &routing);
} /* namespace libcamera */

2
src/libcamera/pipeline/simple/simple.cpp
View file

@ -1388,7 +1388,7 @@ int SimplePipelineHandler::resetRoutingTable(V4L2Subdevice *subdev)
LOG(SimplePipeline, Debug)
<< "Routing table of " << subdev->deviceNode()
<< " reset to " << routing.toString();
<< " reset to " << routing;
return 0;
}

29
src/libcamera/v4l2_subdevice.cpp
View file

@ -899,30 +899,31 @@ std::ostream &operator<<(std::ostream &out, const V4L2Subdevice::Stream &stream)
}
/**
* \class V4L2Subdevice::Routing
* \typedef V4L2Subdevice::Routing
* \brief V4L2 subdevice routing table
*
* This class stores a subdevice routing table as a vector of routes.
*/
/**
* \brief Assemble and return a string describing the routing table
* \return A string describing the routing table
* \brief Insert a text representation of a V4L2Subdevice::Routing into an
* output stream
* \param[in] out The output stream
* \param[in] routing The V4L2Subdevice::Routing
* \return The output stream \a out
*/
std::string V4L2Subdevice::Routing::toString() const
std::ostream &operator<<(std::ostream &out, const V4L2Subdevice::Routing &routing)
{
std::stringstream routing;
for (const auto &[i, route] : utils::enumerate(*this)) {
routing << "[" << i << "] "
<< route.sink_pad << "/" << route.sink_stream << " -> "
<< route.source_pad << "/" << route.source_stream
<< " (" << utils::hex(route.flags) << ")";
if (i != size() - 1)
routing << ", ";
for (const auto &[i, route] : utils::enumerate(routing)) {
out << "[" << i << "] "
<< route.sink_pad << "/" << route.sink_stream << " -> "
<< route.source_pad << "/" << route.source_stream
<< " (" << utils::hex(route.flags) << ")";
if (i != routing.size() - 1)
out << ", ";
}
return routing.str();
return out;
}
/**