[libcamera-devel] [PATCH 1/2] libcamera: pipeline: simple: converter: Add scaling support
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Tue May 19 05:06:23 CEST 2020
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;
+
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
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