@@ -45,6 +45,152 @@ static struct {
/* \todo NV42 is used in libcamera but is not mapped in GStreamer yet. */
};
+static GstVideoColorimetry
+colorimetry_from_colorspace(const ColorSpace &colorSpace)
+{
+ GstVideoColorimetry colorimetry;
+
+ switch (colorSpace.primaries) {
+ case ColorSpace::Primaries::Raw:
+ colorimetry.primaries = GST_VIDEO_COLOR_PRIMARIES_UNKNOWN;
+ break;
+ case ColorSpace::Primaries::Smpte170m:
+ colorimetry.primaries = GST_VIDEO_COLOR_PRIMARIES_SMPTE170M;
+ break;
+ case ColorSpace::Primaries::Rec709:
+ colorimetry.primaries = GST_VIDEO_COLOR_PRIMARIES_BT709;
+ break;
+ case ColorSpace::Primaries::Rec2020:
+ colorimetry.primaries = GST_VIDEO_COLOR_PRIMARIES_BT2020;
+ break;
+ }
+
+ switch (colorSpace.transferFunction) {
+ case ColorSpace::TransferFunction::Linear:
+ colorimetry.transfer = GST_VIDEO_TRANSFER_GAMMA10;
+ break;
+ case ColorSpace::TransferFunction::Srgb:
+ colorimetry.transfer = GST_VIDEO_TRANSFER_SRGB;
+ break;
+ case ColorSpace::TransferFunction::Rec709:
+ colorimetry.transfer = GST_VIDEO_TRANSFER_BT709;
+ break;
+ }
+
+ switch (colorSpace.ycbcrEncoding) {
+ case ColorSpace::YcbcrEncoding::None:
+ colorimetry.matrix = GST_VIDEO_COLOR_MATRIX_RGB;
+ break;
+ case ColorSpace::YcbcrEncoding::Rec601:
+ colorimetry.matrix = GST_VIDEO_COLOR_MATRIX_BT601;
+ break;
+ case ColorSpace::YcbcrEncoding::Rec709:
+ colorimetry.matrix = GST_VIDEO_COLOR_MATRIX_BT709;
+ break;
+ case ColorSpace::YcbcrEncoding::Rec2020:
+ colorimetry.matrix = GST_VIDEO_COLOR_MATRIX_BT2020;
+ break;
+ }
+
+ switch (colorSpace.range) {
+ case ColorSpace::Range::Full:
+ colorimetry.range = GST_VIDEO_COLOR_RANGE_0_255;
+ break;
+ case ColorSpace::Range::Limited:
+ colorimetry.range = GST_VIDEO_COLOR_RANGE_16_235;
+ break;
+ }
+
+ return colorimetry;
+}
+
+static std::optional<ColorSpace>
+colorspace_from_colorimetry(const GstVideoColorimetry &colorimetry)
+{
+ std::optional<ColorSpace> colorspace;
+
+ switch (colorimetry.primaries) {
+ case GST_VIDEO_COLOR_PRIMARIES_UNKNOWN:
+ /* Unknown primaries map to raw colorspace in gstreamer */
+ return ColorSpace::Raw;
+ case GST_VIDEO_COLOR_PRIMARIES_SMPTE170M:
+ colorspace->primaries = ColorSpace::Primaries::Smpte170m;
+ break;
+ case GST_VIDEO_COLOR_PRIMARIES_BT709:
+ colorspace->primaries = ColorSpace::Primaries::Rec709;
+ break;
+ case GST_VIDEO_COLOR_PRIMARIES_BT2020:
+ colorspace->primaries = ColorSpace::Primaries::Rec2020;
+ break;
+ default:
+ GST_WARNING("Colorimetry primaries %d not mapped in gstlibcamera",
+ colorimetry.primaries);
+ return std::nullopt;
+ }
+
+ switch (colorimetry.transfer) {
+ /* Transfer function mappings inspired from v4l2src plugin */
+ case GST_VIDEO_TRANSFER_GAMMA18:
+ case GST_VIDEO_TRANSFER_GAMMA20:
+ case GST_VIDEO_TRANSFER_GAMMA22:
+ case GST_VIDEO_TRANSFER_GAMMA28:
+ GST_WARNING("GAMMA 18, 20, 22, 28 transfer functions not supported");
+ /* fallthrough */
+ case GST_VIDEO_TRANSFER_GAMMA10:
+ colorspace->transferFunction = ColorSpace::TransferFunction::Linear;
+ break;
+ case GST_VIDEO_TRANSFER_SRGB:
+ colorspace->transferFunction = ColorSpace::TransferFunction::Srgb;
+ break;
+ case GST_VIDEO_TRANSFER_BT601:
+ case GST_VIDEO_TRANSFER_BT2020_12:
+ case GST_VIDEO_TRANSFER_BT2020_10:
+ case GST_VIDEO_TRANSFER_BT709:
+ colorspace->transferFunction = ColorSpace::TransferFunction::Rec709;
+ break;
+ default:
+ GST_WARNING("Colorimetry transfer function %d not mapped in gstlibcamera",
+ colorimetry.transfer);
+ return std::nullopt;
+ }
+
+ switch (colorimetry.matrix) {
+ case GST_VIDEO_COLOR_MATRIX_RGB:
+ colorspace->ycbcrEncoding = ColorSpace::YcbcrEncoding::None;
+ break;
+ /* FCC is about the same as BT601 with less digit */
+ case GST_VIDEO_COLOR_MATRIX_FCC:
+ case GST_VIDEO_COLOR_MATRIX_BT601:
+ colorspace->ycbcrEncoding = ColorSpace::YcbcrEncoding::Rec601;
+ break;
+ case GST_VIDEO_COLOR_MATRIX_BT709:
+ colorspace->ycbcrEncoding = ColorSpace::YcbcrEncoding::Rec709;
+ break;
+ case GST_VIDEO_COLOR_MATRIX_BT2020:
+ colorspace->ycbcrEncoding = ColorSpace::YcbcrEncoding::Rec2020;
+ break;
+ default:
+ GST_WARNING("Colorimetry matrix %d not mapped in gstlibcamera",
+ colorimetry.matrix);
+ return std::nullopt;
+ }
+
+ switch (colorimetry.range) {
+ case GST_VIDEO_COLOR_RANGE_0_255:
+ colorspace->range = ColorSpace::Range::Full;
+ break;
+ case GST_VIDEO_COLOR_RANGE_16_235:
+ colorspace->range = ColorSpace::Range::Limited;
+ break;
+ default:
+ GST_WARNING("Colorimetry range %d not mapped in gstlibcamera",
+ colorimetry.range);
+ return std::nullopt;
+ }
+
+ return colorspace;
+}
+
static GstVideoFormat
pixel_format_to_gst_format(const PixelFormat &format)
{
@@ -139,6 +285,18 @@ gst_libcamera_stream_configuration_to_caps(const StreamConfiguration &stream_cfg
"width", G_TYPE_INT, stream_cfg.size.width,
"height", G_TYPE_INT, stream_cfg.size.height,
nullptr);
+
+ if (stream_cfg.colorSpace) {
+ GstVideoColorimetry colorimetry = colorimetry_from_colorspace(stream_cfg.colorSpace.value());
+ gchar *colorimetry_str = gst_video_colorimetry_to_string(&colorimetry);
+
+ if (colorimetry_str)
+ gst_structure_set(s, "colorimetry", G_TYPE_STRING, colorimetry_str, nullptr);
+ else
+ g_error("Got invalid colorimetry from ColorSpace: %s",
+ ColorSpace::toString(stream_cfg.colorSpace).c_str());
+ }
+
gst_caps_append_structure(caps, s);
return caps;
@@ -222,6 +380,17 @@ gst_libcamera_configure_stream_from_caps(StreamConfiguration &stream_cfg,
gst_structure_get_int(s, "height", &height);
stream_cfg.size.width = width;
stream_cfg.size.height = height;
+
+ /* Configure colorimetry */
+ if (gst_structure_has_field(s, "colorimetry")) {
+ const gchar *colorimetry_str = gst_structure_get_string(s, "colorimetry");
+ GstVideoColorimetry colorimetry;
+
+ if (!gst_video_colorimetry_from_string(&colorimetry, colorimetry_str))
+ g_critical("Invalid colorimetry %s", colorimetry_str);
+
+ stream_cfg.colorSpace = colorspace_from_colorimetry(colorimetry);
+ }
}
#if !GST_CHECK_VERSION(1, 17, 1)