[libcamera-devel,v4,03/12] pipeline: raspberrypi: Add a pipeline config structure
diff mbox series

Message ID 20221209090050.19441-4-naush@raspberrypi.com
State Superseded
Headers show
Series
  • Raspberry Pi: Platform configuration and buffer allocation improvements
Related show

Commit Message

Naushir Patuck Dec. 9, 2022, 9 a.m. UTC 
Add a configuration structure to store platform specific parameters used by
the pipeline handler. Currently, these only store Unicam buffer counts,
replacing the hardcoded static values in the source code.

In subsequent commits, more parameters will be added to the configuration
structure, and parameters will be read in through a config file.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
---
 .../pipeline/raspberrypi/raspberrypi.cpp      | 49 ++++++++++++++++---
 1 file changed, 42 insertions(+), 7 deletions(-)

Patch
diff mbox series 

diff --git a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
index 0e0b71945640..f6388d63416b 100644
--- a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
+++ b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
@@ -199,6 +199,7 @@  public:
 
 	int loadIPA(ipa::RPi::IPAInitResult *result);
 	int configureIPA(const CameraConfiguration *config, ipa::RPi::IPAConfigResult *result);
+	int configurePipeline();
 
 	void enumerateVideoDevices(MediaLink *link);
 
@@ -294,6 +295,21 @@  public:
 	/* Have internal buffers been allocated? */
 	bool buffersAllocated_;
 
+	struct Config {
+		/*
+		 * The minimum number of internal buffers to be allocated for
+		 * the Unicam Image stream.
+		 */
+		unsigned int minUnicamBuffers;
+		/*
+		 * The minimum total (internal + external) buffer count used for
+		 * the Unicam Image stream.
+		 */
+		unsigned int minTotalUnicamBuffers;
+	};
+
+	Config config_;
+
 private:
 	void checkRequestCompleted();
 	void fillRequestMetadata(const ControlList &bufferControls,
@@ -1377,6 +1393,12 @@  int PipelineHandlerRPi::registerCamera(MediaDevice *unicam, MediaDevice *isp, Me
 	streams.insert(&data->isp_[Isp::Output0]);
 	streams.insert(&data->isp_[Isp::Output1]);
 
+	int ret = data->configurePipeline();
+	if (ret) {
+		LOG(RPI, Error) << "Unable to load pipeline handler configuration";
+		return ret;
+	}
+
 	/* Create and register the camera. */
 	const std::string &id = data->sensor_->id();
 	std::shared_ptr<Camera> camera =
@@ -1439,25 +1461,28 @@  int PipelineHandlerRPi::prepareBuffers(Camera *camera)
 	for (auto const stream : data->streams_) {
 		unsigned int numBuffers;
 		/*
-		 * For Unicam, allocate a minimum of 4 buffers as we want
-		 * to avoid any frame drops.
+		 * For Unicam, allocate a minimum number of buffers for internal
+		 * use as we want to avoid any frame drops.
 		 */
-		constexpr unsigned int minBuffers = 4;
+		const unsigned int minBuffers = data->config_.minTotalUnicamBuffers;
 		if (stream == &data->unicam_[Unicam::Image]) {
 			/*
 			 * If an application has configured a RAW stream, allocate
 			 * additional buffers to make up the minimum, but ensure
-			 * we have at least 2 sets of internal buffers to use to
-			 * minimise frame drops.
+			 * we have at least minUnicamBuffers of internal buffers
+			 * to use to minimise frame drops.
 			 */
-			numBuffers = std::max<int>(2, minBuffers - numRawBuffers);
+			numBuffers = std::max<int>(data->config_.minUnicamBuffers,
+						   minBuffers - numRawBuffers);
 		} else if (stream == &data->isp_[Isp::Input]) {
 			/*
 			 * ISP input buffers are imported from Unicam, so follow
 			 * similar logic as above to count all the RAW buffers
 			 * available.
 			 */
-			numBuffers = numRawBuffers + std::max<int>(2, minBuffers - numRawBuffers);
+			numBuffers = numRawBuffers +
+				     std::max<int>(data->config_.minUnicamBuffers,
+						   minBuffers - numRawBuffers);
 
 		} else if (stream == &data->unicam_[Unicam::Embedded]) {
 			/*
@@ -1630,6 +1655,16 @@  int RPiCameraData::configureIPA(const CameraConfiguration *config, ipa::RPi::IPA
 	return 0;
 }
 
+int RPiCameraData::configurePipeline()
+{
+	config_ = {
+		.minUnicamBuffers = 2,
+		.minTotalUnicamBuffers = 4,
+	};
+
+	return 0;
+}
+
 /*
  * enumerateVideoDevices() iterates over the Media Controller topology, starting
  * at the sensor and finishing at Unicam. For each sensor, RPiCameraData stores