libcamera: pipeline: simple: Add stride support

Report the stride when configuring the camera. The stride is retrieved
from the capture device first, and overridden by the converter if used.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/libcamera/pipeline/simple/converter.cpp

@@ -12,6 +12,7 @@
 #include <libcamera/buffer.h>
 #include <libcamera/geometry.h>
 #include <libcamera/signal.h>
+#include <libcamera/stream.h>
 
 #include "libcamera/internal/log.h"
 #include "libcamera/internal/media_device.h"
@@ -93,14 +94,14 @@ std::vector<PixelFormat> SimpleConverter::formats(PixelFormat input)
 }
 
 int SimpleConverter::configure(PixelFormat inputFormat,
-			       PixelFormat outputFormat, const Size &size)
+			       StreamConfiguration *cfg)
 {
 	V4L2DeviceFormat format;
 	int ret;
 
 	V4L2PixelFormat videoFormat = m2m_->output()->toV4L2PixelFormat(inputFormat);
 	format.fourcc = videoFormat;
-	format.size = size;
+	format.size = cfg->size;
 
 	ret = m2m_->output()->setFormat(&format);
 	if (ret < 0) {
@@ -109,7 +110,7 @@ int SimpleConverter::configure(PixelFormat inputFormat,
 		return ret;
 	}
 
-	if (format.fourcc != videoFormat || format.size != size) {
+	if (format.fourcc != videoFormat || format.size != cfg->size) {
 		LOG(SimplePipeline, Error)
 			<< "Input format not supported";
 		return -EINVAL;
@@ -119,7 +120,7 @@ int SimpleConverter::configure(PixelFormat inputFormat,
 	 * Set the pixel format on the output, the size is identical to the
 	 * input as we don't support scaling.
 	 */
-	videoFormat = m2m_->capture()->toV4L2PixelFormat(outputFormat);
+	videoFormat = m2m_->capture()->toV4L2PixelFormat(cfg->pixelFormat);
 	format.fourcc = videoFormat;
 
 	ret = m2m_->capture()->setFormat(&format);
@@ -129,12 +130,14 @@ int SimpleConverter::configure(PixelFormat inputFormat,
 		return ret;
 	}
 
-	if (format.fourcc != videoFormat || format.size != size) {
+	if (format.fourcc != videoFormat || format.size != cfg->size) {
 		LOG(SimplePipeline, Error)
 			<< "Output format not supported";
 		return -EINVAL;
 	}
 
+	cfg->stride = format.planes[0].bpl;
+
 	return 0;
 }
 

src/libcamera/pipeline/simple/converter.h

@@ -20,6 +20,7 @@ namespace libcamera {
 class FrameBuffer;
 class MediaDevice;
 struct Size;
+struct StreamConfiguration;
 class V4L2M2MDevice;
 
 class SimpleConverter
@@ -33,8 +34,7 @@ public:
 
 	std::vector<PixelFormat> formats(PixelFormat input);
 
-	int configure(PixelFormat inputFormat, PixelFormat outputFormat,
-		      const Size &size);
+	int configure(PixelFormat inputFormat, StreamConfiguration *cfg);
 	int exportBuffers(unsigned int count,
 			  std::vector<std::unique_ptr<FrameBuffer>> *buffers);
 

src/libcamera/pipeline/simple/simple.cpp

@@ -549,12 +549,13 @@ int SimplePipelineHandler::configure(Camera *camera, CameraConfiguration *c)
 		return -EINVAL;
 	}
 
+	cfg.stride = captureFormat.planes[0].bpl;
+
 	/* Configure the converter if required. */
 	useConverter_ = config->needConversion();
 
 	if (useConverter_) {
-		int ret = converter_->configure(pipeConfig.pixelFormat,
-						cfg.pixelFormat, cfg.size);
+		int ret = converter_->configure(pipeConfig.pixelFormat, &cfg);
 		if (ret < 0) {
 			LOG(SimplePipeline, Error)
 				<< "Unable to configure converter";