[libcamera-devel] [PATCH 1/2] libcamera: pipeline: simple: converter: Add scaling support

[Laurent Pinchart]

Hi Niklas,

On Tue, May 19, 2020 at 04:02:36PM +0200, Niklas Söderlund wrote:
> On 2020-05-19 06:06:23 +0300, Laurent Pinchart wrote:
> > Extend the SimpleConverter to support scaling, with reporting of the
> > minimum and maximum output sizes supported for a given input size.
> > 
> > Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> > ---
> >  src/libcamera/pipeline/simple/converter.cpp | 67 ++++++++++++++++++---
> >  src/libcamera/pipeline/simple/converter.h   |  7 ++-
> >  src/libcamera/pipeline/simple/simple.cpp    |  2 +-
> >  3 files changed, 63 insertions(+), 13 deletions(-)
> > 
> > diff --git a/src/libcamera/pipeline/simple/converter.cpp b/src/libcamera/pipeline/simple/converter.cpp
> > index 02443e7f78ed..e5e2f0fddb62 100644
> > --- a/src/libcamera/pipeline/simple/converter.cpp
> > +++ b/src/libcamera/pipeline/simple/converter.cpp
> > @@ -8,10 +8,12 @@
> >  #include "converter.h"
> >  
> >  #include <algorithm>
> > +#include <limits.h>
> >  
> >  #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"
> > @@ -92,15 +94,60 @@ std::vector<PixelFormat> SimpleConverter::formats(PixelFormat input)
> >  	return pixelFormats;
> >  }
> >  
> > -int SimpleConverter::configure(PixelFormat inputFormat,
> > -			       PixelFormat outputFormat, const Size &size)
> > +SizeRange SimpleConverter::sizes(const Size &input)
> > +{
> > +	if (!m2m_)
> > +		return {};
> > +
> > +	/*
> > +	 * Set the size on the input side (V4L2 output) of the converter to
> > +	 * enumerate the scaling capabilities on its output (V4L2 capture).
> > +	 */
> > +	V4L2DeviceFormat format;
> > +	format.fourcc = V4L2PixelFormat();
> > +	format.size = input;
> > +
> > +	int ret = m2m_->output()->setFormat(&format);
> > +	if (ret < 0) {
> > +		LOG(SimplePipeline, Error)
> > +			<< "Failed to set format: " << strerror(-ret);
> > +		return {};
> > +	}
> > +
> > +	SizeRange sizes;
> > +
> > +	format.size = { 1, 1 };
> > +	ret = m2m_->capture()->setFormat(&format);
> > +	if (ret < 0) {
> > +		LOG(SimplePipeline, Error)
> > +			<< "Failed to set format: " << strerror(-ret);
> > +		return {};
> > +	}
> > +
> > +	sizes.min = format.size;
> > +
> > +	format.size = { UINT_MAX, UINT_MAX };
> > +	ret = m2m_->capture()->setFormat(&format);
> > +	if (ret < 0) {
> > +		LOG(SimplePipeline, Error)
> > +			<< "Failed to set format: " << strerror(-ret);
> > +		return {};
> > +	}
> > +
> > +	sizes.max = format.size;
> > +
> > +	return sizes;
> > +}
> > +
> > +int SimpleConverter::configure(PixelFormat inputFormat, const Size &inputSize,
> > +			       StreamConfiguration *cfg)
> >  {
> >  	V4L2DeviceFormat format;
> >  	int ret;
> >  
> >  	V4L2PixelFormat videoFormat = m2m_->output()->toV4L2PixelFormat(inputFormat);
> >  	format.fourcc = videoFormat;
> > -	format.size = size;
> > +	format.size = inputSize;
> >  
> >  	ret = m2m_->output()->setFormat(&format);
> >  	if (ret < 0) {
> > @@ -109,18 +156,16 @@ int SimpleConverter::configure(PixelFormat inputFormat,
> >  		return ret;
> >  	}
> >  
> > -	if (format.fourcc != videoFormat || format.size != size) {
> > +	if (format.fourcc != videoFormat || format.size != inputSize) {
> >  		LOG(SimplePipeline, Error)
> >  			<< "Input format not supported";
> >  		return -EINVAL;
> >  	}
> >  
> > -	/*
> > -	 * 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);
> > +	/* Set the pixel format and size on the output. */
> > +	videoFormat = m2m_->capture()->toV4L2PixelFormat(cfg->pixelFormat);
> >  	format.fourcc = videoFormat;
> > +	format.size = cfg->size;
> >  
> >  	ret = m2m_->capture()->setFormat(&format);
> >  	if (ret < 0) {
> > @@ -129,12 +174,14 @@ 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;
> 
> This seems to be an unrelated change, but nice that it's fixed ;-)

Indeed. I'll split it out to a separate patch.

> Reviewed-by: Niklas Söderlund <niklas.soderlund at ragnatech.se>
> 
> > +
> >  	return 0;
> >  }
> >  
> > diff --git a/src/libcamera/pipeline/simple/converter.h b/src/libcamera/pipeline/simple/converter.h
> > index a33071fa8578..1f770eb844b5 100644
> > --- a/src/libcamera/pipeline/simple/converter.h
> > +++ b/src/libcamera/pipeline/simple/converter.h
> > @@ -20,6 +20,8 @@ namespace libcamera {
> >  class FrameBuffer;
> >  class MediaDevice;
> >  struct Size;
> > +class SizeRange;
> > +struct StreamConfiguration;
> >  class V4L2M2MDevice;
> >  
> >  class SimpleConverter
> > @@ -32,9 +34,10 @@ public:
> >  	void close();
> >  
> >  	std::vector<PixelFormat> formats(PixelFormat input);
> > +	SizeRange sizes(const Size &input);
> >  
> > -	int configure(PixelFormat inputFormat, PixelFormat outputFormat,
> > -		      const Size &size);
> > +	int configure(PixelFormat inputFormat, const Size &inputSize,
> > +		      StreamConfiguration *cfg);
> >  	int exportBuffers(unsigned int count,
> >  			  std::vector<std::unique_ptr<FrameBuffer>> *buffers);
> >  
> > diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
> > index 2565190082c8..b21ad82e1a05 100644
> > --- a/src/libcamera/pipeline/simple/simple.cpp
> > +++ b/src/libcamera/pipeline/simple/simple.cpp
> > @@ -554,7 +554,7 @@ int SimplePipelineHandler::configure(Camera *camera, CameraConfiguration *c)
> >  
> >  	if (useConverter_) {
> >  		int ret = converter_->configure(pipeConfig.pixelFormat,
> > -						cfg.pixelFormat, cfg.size);
> > +						cfg.size, &cfg);
> >  		if (ret < 0) {
> >  			LOG(SimplePipeline, Error)
> >  				<< "Unable to configure converter";

-- 
Regards,

Laurent Pinchart