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-rw-r--r--src/libcamera/color_space.cpp39
-rw-r--r--src/libcamera/pipeline/raspberrypi/raspberrypi.cpp10
-rw-r--r--src/libcamera/v4l2_device.cpp4
-rw-r--r--src/py/libcamera/py_main.cpp2
4 files changed, 31 insertions, 24 deletions
diff --git a/src/libcamera/color_space.cpp b/src/libcamera/color_space.cpp
index caf39760..f0d6109a 100644
--- a/src/libcamera/color_space.cpp
+++ b/src/libcamera/color_space.cpp
@@ -29,21 +29,28 @@ namespace libcamera {
* (sometimes also referred to as the quantisation) of the color space.
*
* Certain combinations of these fields form well-known standard color
- * spaces such as "JPEG" or "REC709".
+ * spaces such as "sRGB" or "Rec709".
*
* In the strictest sense a "color space" formally only refers to the
* color primaries and white point. Here, however, the ColorSpace class
* adopts the common broader usage that includes the transfer function,
* Y'CbCr encoding method and quantisation.
*
- * For more information on the specific color spaces described here, please
- * see:
+ * More information on color spaces is available in the V4L2 documentation, see
+ * in particular
*
* - <a href="https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/colorspaces-details.html#col-srgb">sRGB</a>
* - <a href="https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/colorspaces-details.html#col-jpeg">JPEG</a>
* - <a href="https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/colorspaces-details.html#col-smpte-170m">SMPTE 170M</a>
* - <a href="https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/colorspaces-details.html#col-rec709">Rec.709</a>
* - <a href="https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/colorspaces-details.html#col-bt2020">Rec.2020</a>
+ *
+ * Note that there is no guarantee of a 1:1 mapping between color space names
+ * and definitions in libcamera and V4L2. A notable difference is that the sYCC
+ * libcamera color space is called JPEG in V4L2 due to historical reasons.
+ *
+ * \todo Define the color space fully in the libcamera API to avoid referencing
+ * V4L2
*/
/**
@@ -121,8 +128,8 @@ namespace libcamera {
* \brief Assemble and return a readable string representation of the
* ColorSpace
*
- * If the color space matches a standard ColorSpace (such as ColorSpace::Jpeg)
- * then the short name of the color space ("JPEG") is returned. Otherwise
+ * If the color space matches a standard ColorSpace (such as ColorSpace::Sycc)
+ * then the short name of the color space ("sYCC") is returned. Otherwise
* the four constituent parts of the ColorSpace are assembled into a longer
* string.
*
@@ -134,8 +141,8 @@ std::string ColorSpace::toString() const
static const std::array<std::pair<ColorSpace, const char *>, 6> colorSpaceNames = { {
{ ColorSpace::Raw, "RAW" },
- { ColorSpace::Jpeg, "JPEG" },
{ ColorSpace::Srgb, "sRGB" },
+ { ColorSpace::Sycc, "sYCC" },
{ ColorSpace::Smpte170m, "SMPTE170M" },
{ ColorSpace::Rec709, "Rec709" },
{ ColorSpace::Rec2020, "Rec2020" },
@@ -243,27 +250,27 @@ const ColorSpace ColorSpace::Raw = {
};
/**
- * \brief A constant representing the JPEG color space used for
- * encoding JPEG images
+ * \brief A constant representing the sRGB color space
+ *
+ * This is identical to the sYCC color space except that the Y'CbCr
+ * range is limited rather than full.
*/
-const ColorSpace ColorSpace::Jpeg = {
+const ColorSpace ColorSpace::Srgb = {
Primaries::Rec709,
TransferFunction::Srgb,
YcbcrEncoding::Rec601,
- Range::Full
+ Range::Limited
};
/**
- * \brief A constant representing the sRGB color space
- *
- * This is identical to the JPEG color space except that the Y'CbCr
- * range is limited rather than full.
+ * \brief A constant representing the sYCC color space, typically used for
+ * encoding JPEG images
*/
-const ColorSpace ColorSpace::Srgb = {
+const ColorSpace ColorSpace::Sycc = {
Primaries::Rec709,
TransferFunction::Srgb,
YcbcrEncoding::Rec601,
- Range::Limited
+ Range::Full
};
/**
diff --git a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
index e895584d..b4094898 100644
--- a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
+++ b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
@@ -593,11 +593,11 @@ CameraConfiguration *PipelineHandlerRPi::generateConfiguration(Camera *camera,
fmts = data->isp_[Isp::Output0].dev()->formats();
pixelFormat = formats::NV12;
/*
- * Still image codecs usually expect the JPEG color space.
+ * Still image codecs usually expect the sYCC color space.
* Even RGB codecs will be fine as the RGB we get with the
- * JPEG color space is the same as sRGB.
+ * sYCC color space is the same as sRGB.
*/
- colorSpace = ColorSpace::Jpeg;
+ colorSpace = ColorSpace::Sycc;
/* Return the largest sensor resolution. */
size = sensorSize;
bufferCount = 1;
@@ -628,7 +628,7 @@ CameraConfiguration *PipelineHandlerRPi::generateConfiguration(Camera *camera,
case StreamRole::Viewfinder:
fmts = data->isp_[Isp::Output0].dev()->formats();
pixelFormat = formats::ARGB8888;
- colorSpace = ColorSpace::Jpeg;
+ colorSpace = ColorSpace::Sycc;
size = { 800, 600 };
bufferCount = 4;
outCount++;
@@ -835,7 +835,7 @@ int PipelineHandlerRPi::configure(Camera *camera, CameraConfiguration *config)
format.size = maxSize;
format.fourcc = dev->toV4L2PixelFormat(formats::YUV420);
/* No one asked for output, so the color space doesn't matter. */
- format.colorSpace = ColorSpace::Jpeg;
+ format.colorSpace = ColorSpace::Sycc;
ret = dev->setFormat(&format);
if (ret) {
LOG(RPI, Error)
diff --git a/src/libcamera/v4l2_device.cpp b/src/libcamera/v4l2_device.cpp
index 3fc8438f..b22a981f 100644
--- a/src/libcamera/v4l2_device.cpp
+++ b/src/libcamera/v4l2_device.cpp
@@ -745,8 +745,8 @@ void V4L2Device::eventAvailable()
static const std::map<uint32_t, ColorSpace> v4l2ToColorSpace = {
{ V4L2_COLORSPACE_RAW, ColorSpace::Raw },
- { V4L2_COLORSPACE_JPEG, ColorSpace::Jpeg },
{ V4L2_COLORSPACE_SRGB, ColorSpace::Srgb },
+ { V4L2_COLORSPACE_JPEG, ColorSpace::Sycc },
{ V4L2_COLORSPACE_SMPTE170M, ColorSpace::Smpte170m },
{ V4L2_COLORSPACE_REC709, ColorSpace::Rec709 },
{ V4L2_COLORSPACE_BT2020, ColorSpace::Rec2020 },
@@ -771,8 +771,8 @@ static const std::map<uint32_t, ColorSpace::Range> v4l2ToRange = {
static const std::vector<std::pair<ColorSpace, v4l2_colorspace>> colorSpaceToV4l2 = {
{ ColorSpace::Raw, V4L2_COLORSPACE_RAW },
- { ColorSpace::Jpeg, V4L2_COLORSPACE_JPEG },
{ ColorSpace::Srgb, V4L2_COLORSPACE_SRGB },
+ { ColorSpace::Sycc, V4L2_COLORSPACE_JPEG },
{ ColorSpace::Smpte170m, V4L2_COLORSPACE_SMPTE170M },
{ ColorSpace::Rec709, V4L2_COLORSPACE_REC709 },
{ ColorSpace::Rec2020, V4L2_COLORSPACE_BT2020 },
diff --git a/src/py/libcamera/py_main.cpp b/src/py/libcamera/py_main.cpp
index 7e613a3f..75947889 100644
--- a/src/py/libcamera/py_main.cpp
+++ b/src/py/libcamera/py_main.cpp
@@ -463,8 +463,8 @@ PYBIND11_MODULE(_libcamera, m)
.def_readwrite("ycbcrEncoding", &ColorSpace::ycbcrEncoding)
.def_readwrite("range", &ColorSpace::range)
.def_static("Raw", []() { return ColorSpace::Raw; })
- .def_static("Jpeg", []() { return ColorSpace::Jpeg; })
.def_static("Srgb", []() { return ColorSpace::Srgb; })
+ .def_static("Sycc", []() { return ColorSpace::Sycc; })
.def_static("Smpte170m", []() { return ColorSpace::Smpte170m; })
.def_static("Rec709", []() { return ColorSpace::Rec709; })
.def_static("Rec2020", []() { return ColorSpace::Rec2020; });
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-18 12:13:39 +0000