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libcamera: media_device: Add functions to get a MediaLink

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Add three overloaded functions 'link()' to retrieve a link between two
pads. Each overloaded implementation exposes a different method to
identify the source and sink pads.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
This commit is contained in:
Jacopo Mondi 2019-01-03 15:30:53 +01:00
parent 6275a14215
commit b65feafe32
2 changed files with 86 additions and 0 deletions
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6
src/libcamera/include/media_device.h
View file

@ -40,6 +40,12 @@ public:
const std::vector<MediaEntity *> &entities() const { return entities_; }
MediaEntity *getEntityByName(const std::string &name) const;
MediaLink *link(const std::string &sourceName, unsigned int sourceIdx,
const std::string &sinkName, unsigned int sinkIdx);
MediaLink *link(const MediaEntity *source, unsigned int sourceIdx,
const MediaEntity *sink, unsigned int sinkIdx);
MediaLink *link(const MediaPad *source, const MediaPad *sink);
private:
std::string driver_;
std::string devnode_;

80
src/libcamera/media_device.cpp
View file

@ -306,6 +306,86 @@ MediaEntity *MediaDevice::getEntityByName(const std::string &name) const
return nullptr;
}
/**
* \brief Retrieve the MediaLink connecting two pads, identified by entity
* names and pad indexes
* \param sourceName The source entity name
* \param sourceIdx The index of the source pad
* \param sinkName The sink entity name
* \param sinkIdx The index of the sink pad
*
* Find the link that connects the pads at index \a sourceIdx of the source
* entity with name \a sourceName, to the pad at index \a sinkIdx of the
* sink entity with name \a sinkName, if any.
*
* \sa MediaDevice::link(const MediaEntity *source, unsigned int sourceIdx, const MediaEntity *sink, unsigned int sinkIdx) const
* \sa MediaDevice::link(const MediaPad *source, const MediaPad *sink) const
*
* \return The link that connects the two pads, or nullptr if no such a link
* exists
*/
MediaLink *MediaDevice::link(const std::string &sourceName, unsigned int sourceIdx,
const std::string &sinkName, unsigned int sinkIdx)
{
const MediaEntity *source = getEntityByName(sourceName);
const MediaEntity *sink = getEntityByName(sinkName);
if (!source || !sink)
return nullptr;
return link(source, sourceIdx, sink, sinkIdx);
}
/**
* \brief Retrieve the MediaLink connecting two pads, identified by the
* entities they belong to and pad indexes
* \param source The source entity
* \param sourceIdx The index of the source pad
* \param sink The sink entity
* \param sinkIdx The index of the sink pad
*
* Find the link that connects the pads at index \a sourceIdx of the source
* entity \a source, to the pad at index \a sinkIdx of the sink entity \a
* sink, if any.
*
* \sa MediaDevice::link(const std::string &sourceName, unsigned int sourceIdx, const std::string &sinkName, unsigned int sinkIdx) const
* \sa MediaDevice::link(const MediaPad *source, const MediaPad *sink) const
*
* \return The link that connects the two pads, or nullptr if no such a link
* exists
*/
MediaLink *MediaDevice::link(const MediaEntity *source, unsigned int sourceIdx,
const MediaEntity *sink, unsigned int sinkIdx)
{
const MediaPad *sourcePad = source->getPadByIndex(sourceIdx);
const MediaPad *sinkPad = sink->getPadByIndex(sinkIdx);
if (!sourcePad || !sinkPad)
return nullptr;
return link(sourcePad, sinkPad);
}
/**
* \brief Retrieve the MediaLink that connects two pads
* \param source The source pad
* \param sink The sink pad
*
* \sa MediaDevice::link(const std::string &sourceName, unsigned int sourceIdx, const std::string &sinkName, unsigned int sinkIdx) const
* \sa MediaDevice::link(const MediaEntity *source, unsigned int sourceIdx, const MediaEntity *sink, unsigned int sinkIdx) const
*
* \return The link that connects the two pads, or nullptr if no such a link
* exists
*/
MediaLink *MediaDevice::link(const MediaPad *source, const MediaPad *sink)
{
for (MediaLink *link : source->links()) {
if (link->sink()->id() == sink->id())
return link;
}
return nullptr;
}
/**
* \var MediaDevice::objects_
* \brief Global map of media objects (entities, pads, links) keyed by their