[libcamera-devel] [PATCH 10/13] libcamera: ipa: Extend to support IPA interactions

Niklas Söderlund niklas.soderlund at ragnatech.se
Wed Aug 28 03:17:07 CEST 2019 

The IPA interface needs to support interactions with the pipeline, add
interfaces to control the sensor and handling of request ISP parameters
and statistics.

The interface needs to be extended further to support attaching the
result of the statistic analyses to the request before the request
completes to the user. It also needs to modified to allow proper per
frame control of capture parameters.

Signed-off-by: Niklas Söderlund <niklas.soderlund at ragnatech.se>
---
 include/libcamera/ipa/ipa_interface.h   | 17 +++++-
 src/ipa/ipa_dummy.cpp                   | 11 ++--
 src/ipa/ipa_dummy_isolate.cpp           | 11 ++--
 src/libcamera/ipa_interface.cpp         | 72 ++++++++++++++++++++++++-
 src/libcamera/proxy/ipa_proxy_linux.cpp | 12 ++---
 5 files changed, 98 insertions(+), 25 deletions(-)

diff --git a/include/libcamera/ipa/ipa_interface.h b/include/libcamera/ipa/ipa_interface.h
index 2c5eb1fd524311cb..38e16ff37214f7b9 100644
--- a/include/libcamera/ipa/ipa_interface.h
+++ b/include/libcamera/ipa/ipa_interface.h
@@ -7,14 +7,29 @@
 #ifndef __LIBCAMERA_IPA_INTERFACE_H__
 #define __LIBCAMERA_IPA_INTERFACE_H__
 
+#include <libcamera/controls.h>
+#include <libcamera/signal.h>
+
+#include "v4l2_controls.h"
+
 namespace libcamera {
 
+class Buffer;
+class Request;
+
 class IPAInterface
 {
 public:
 	virtual ~IPAInterface() {}
 
-	virtual int init() = 0;
+	virtual int initSensor(const V4L2ControlInfoMap &controls) = 0;
+	virtual void processRequest(const void *cookie,
+				    const ControlList &controls,
+				    Buffer &parameters) = 0;
+	virtual void updateStatistics(const void *cookie, Buffer &statistics) = 0;
+
+	Signal<V4L2ControlList> updateSensor;
+	Signal<const void *> queueRequest;
 };
 
 } /* namespace libcamera */
diff --git a/src/ipa/ipa_dummy.cpp b/src/ipa/ipa_dummy.cpp
index b0e944a17fc5cffb..11dcc54ce4ebc6f4 100644
--- a/src/ipa/ipa_dummy.cpp
+++ b/src/ipa/ipa_dummy.cpp
@@ -15,15 +15,12 @@ namespace libcamera {
 class IPADummy : public IPAInterface
 {
 public:
-	int init();
+	int initSensor(const V4L2ControlInfoMap &controls) { return 0; }
+	void processRequest(const void *cookie, const ControlList &controls,
+			    Buffer &parameters) {}
+	void updateStatistics(const void *cookie, Buffer &statistics) {}
 };
 
-int IPADummy::init()
-{
-	std::cout << "initializing dummy IPA!" << std::endl;
-	return 0;
-}
-
 /*
  * External IPA module interface
  */
diff --git a/src/ipa/ipa_dummy_isolate.cpp b/src/ipa/ipa_dummy_isolate.cpp
index 24434e85d31809e2..4d49c0e372466af6 100644
--- a/src/ipa/ipa_dummy_isolate.cpp
+++ b/src/ipa/ipa_dummy_isolate.cpp
@@ -16,15 +16,12 @@ namespace libcamera {
 class IPADummyIsolate : public IPAInterface
 {
 public:
-	int init();
+	int initSensor(const V4L2ControlInfoMap &controls) { return 0; }
+	void processRequest(const void *cookie, const ControlList &controls,
+			    Buffer &parameters) {}
+	void updateStatistics(const void *cookie, Buffer &statistics) {}
 };
 
-int IPADummyIsolate::init()
-{
-	std::cout << "initializing isolated dummy IPA!" << std::endl;
-	return 0;
-}
-
 /*
  * External IPA module interface
  */
diff --git a/src/libcamera/ipa_interface.cpp b/src/libcamera/ipa_interface.cpp
index 9d30da29228fabb7..4edcebbe84d5a0d0 100644
--- a/src/libcamera/ipa_interface.cpp
+++ b/src/libcamera/ipa_interface.cpp
@@ -20,8 +20,76 @@ namespace libcamera {
  */
 
 /**
- * \fn IPAInterface::init()
- * \brief Initialise the IPAInterface
+ * \fn IPAInterface::initSensor()
+ * \brief Initialize the IPA sensor settings
+ * \param[in] controls List of controls provided by the sensor
+ *
+ * This function is called when a pipeline attaches to an IPA to inform the IPA
+ * of the controls and limits the sensor in the video pipeline supports. The IPA
+ * have the option to set controls of the sensor by emitting the updateSensor
+ * signal.
+ *
+ * \return 0 on success or a negative error code otherwise
+ */
+
+/**
+ * \fn IPAInterface::processRequest()
+ * \brief Provide IPA with a parameter buffer to fill
+ * \param[in] cookie Cookie for the request
+ * \param[in] controls List of controls associated with the request
+ * \param[in,out] parameters Buffer containing an empty parameters buffer
+ *
+ * This function is called by a pipeline handler when it has a request to
+ * process. The IPA shall fill in the \a parameters buffer to achieve the
+ * capture result described in \a controls. The \a cookie value identifiers
+ * the request the controls and parameters buffer corresponds to and can be
+ * matched in updateStatistics() once the request have been processed by the
+ * hardware. The cookie value is only valid from that processRequest() is
+ * called and until updateStatistics() return.
+ *
+ * When the \a parameters buffer is filled in and ready to be queued to hardware
+ * the IPA shall signal pipeline handler using the queueRequest signal with the
+ * cookie value corresponding to the request the parameters belong to.
+ */
+
+/**
+ * \fn IPAInterface::updateStatistics()
+ * \brief Provide IPA with statistic buffer to examine
+ * \param[in] cookie Cookie for the request
+ * \param[in] statistics Buffer containing a filled in statistic buffer
+ *
+ * This function is called once a statistic buffer is completed and have been
+ * dequeue. The IPA may inspect the buffer and update its internal view of the
+ * capture conditions. The \a cookie value can be used to associate the dequeued
+ * statistics buffer with the parameters buffer filled in by the IPA in
+ * processRequest().
+ *
+ * \todo Extend this function to return or signal the result of the statistic
+ * examination by the IPA.
+ */
+
+/**
+ * \var IPAInterface::updateSensor
+ * \brief Signal emitted when the IPA wish to update sensor V4L2 controls
+ *
+ * This signal is emitted when the IPA wish to update one or more V4L2 control
+ * of the sensor in the video pipeline. The list of controls to modify is passed
+ * as a parameter.
+ *
+ * \todo Extend this function to work with per-frame control setting of
+ * controls.
+ */
+
+/**
+ * \var IPAInterface::queueRequest
+ * \brief Signal emitted when the IPA is done preparing a request
+ *
+ * This signal is emitted then the IPA have finished filling in the parameters
+ * buffer and is ready for the request to be committed to hardware for capture.
+ * The request cookie is passed as a parameter.
+ *
+ * \todo Extend this function to work with per-frame control setting of
+ * controls.
  */
 
 } /* namespace libcamera */
diff --git a/src/libcamera/proxy/ipa_proxy_linux.cpp b/src/libcamera/proxy/ipa_proxy_linux.cpp
index f881aab5b2e1178a..bb7aeedf12779c66 100644
--- a/src/libcamera/proxy/ipa_proxy_linux.cpp
+++ b/src/libcamera/proxy/ipa_proxy_linux.cpp
@@ -26,7 +26,10 @@ public:
 	IPAProxyLinux(IPAModule *ipam);
 	~IPAProxyLinux();
 
-	int init();
+	int initSensor(const V4L2ControlInfoMap &controls) { return 0; }
+	void processRequest(const void *cookie, const ControlList &controls,
+			    Buffer &parameters) {}
+	void updateStatistics(const void *cookie, Buffer &statistics) {}
 
 private:
 	void readyRead(IPCUnixSocket *ipc);
@@ -36,13 +39,6 @@ private:
 	IPCUnixSocket *socket_;
 };
 
-int IPAProxyLinux::init()
-{
-	LOG(IPAProxy, Debug) << "initializing IPA via dummy proxy!";
-
-	return 0;
-}
-
 IPAProxyLinux::IPAProxyLinux(IPAModule *ipam)
 {
 	LOG(IPAProxy, Debug)
-- 
2.22.1

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