libcamera: v4l2_pixelformat: Move DRM/V4L2 format conversion

Move the DRM/V4L2 format conversion code from V4L2VideoDevice to
V4L2PixelFormat. This is a more natural home for the code.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 134 insertions, 0 deletions

diff --git a/src/libcamera/v4l2_pixelformat.cpp b/src/libcamera/v4l2_pixelformat.cpp
index 57d65c38..876f5de3 100644
--- a/src/libcamera/v4l2_pixelformat.cpp
+++ b/src/libcamera/v4l2_pixelformat.cpp
@@ -103,4 +103,138 @@ std::string V4L2PixelFormat::toString() const
 	return ss;
 }
 
+/**
+ * \brief Convert the V4L2 pixel format to the corresponding PixelFormat
+ * \return The PixelFormat corresponding to the V4L2 pixel format
+ */
+PixelFormat V4L2PixelFormat::toPixelFormat() const
+{
+	switch (fourcc_) {
+	/* RGB formats. */
+	case V4L2_PIX_FMT_RGB24:
+		return PixelFormat(DRM_FORMAT_BGR888);
+	case V4L2_PIX_FMT_BGR24:
+		return PixelFormat(DRM_FORMAT_RGB888);
+	case V4L2_PIX_FMT_RGBA32:
+		return PixelFormat(DRM_FORMAT_ABGR8888);
+	case V4L2_PIX_FMT_ABGR32:
+		return PixelFormat(DRM_FORMAT_ARGB8888);
+	case V4L2_PIX_FMT_ARGB32:
+		return PixelFormat(DRM_FORMAT_BGRA8888);
+	case V4L2_PIX_FMT_BGRA32:
+		return PixelFormat(DRM_FORMAT_RGBA8888);
+
+	/* YUV packed formats. */
+	case V4L2_PIX_FMT_YUYV:
+		return PixelFormat(DRM_FORMAT_YUYV);
+	case V4L2_PIX_FMT_YVYU:
+		return PixelFormat(DRM_FORMAT_YVYU);
+	case V4L2_PIX_FMT_UYVY:
+		return PixelFormat(DRM_FORMAT_UYVY);
+	case V4L2_PIX_FMT_VYUY:
+		return PixelFormat(DRM_FORMAT_VYUY);
+
+	/* YUY planar formats. */
+	case V4L2_PIX_FMT_NV16:
+	case V4L2_PIX_FMT_NV16M:
+		return PixelFormat(DRM_FORMAT_NV16);
+	case V4L2_PIX_FMT_NV61:
+	case V4L2_PIX_FMT_NV61M:
+		return PixelFormat(DRM_FORMAT_NV61);
+	case V4L2_PIX_FMT_NV12:
+	case V4L2_PIX_FMT_NV12M:
+		return PixelFormat(DRM_FORMAT_NV12);
+	case V4L2_PIX_FMT_NV21:
+	case V4L2_PIX_FMT_NV21M:
+		return PixelFormat(DRM_FORMAT_NV21);
+
+	/* Greyscale formats. */
+	case V4L2_PIX_FMT_GREY:
+		return PixelFormat(DRM_FORMAT_R8);
+
+	/* Compressed formats. */
+	case V4L2_PIX_FMT_MJPEG:
+		return PixelFormat(DRM_FORMAT_MJPEG);
+
+	/* V4L2 formats not yet supported by DRM. */
+	default:
+		LOG(V4L2, Warning)
+			<< "Unsupported V4L2 pixel format "
+			<< toString();
+		return PixelFormat();
+	}
+}
+
+/**
+ * \brief Convert \a pixelFormat to its corresponding V4L2PixelFormat
+ * \param[in] pixelFormat The PixelFormat to convert
+ * \param[in] multiplanar V4L2 Multiplanar API support flag
+ *
+ * Multiple V4L2 formats may exist for one PixelFormat when the format uses
+ * multiple planes, as V4L2 defines separate 4CCs for contiguous and separate
+ * planes formats. Set the \a multiplanar parameter to false to select a format
+ * with contiguous planes, or to true to select a format with non-contiguous
+ * planes.
+ *
+ * \return The V4L2PixelFormat corresponding to \a pixelFormat
+ */
+V4L2PixelFormat V4L2PixelFormat::fromPixelFormat(const PixelFormat &pixelFormat,
+						 bool multiplanar)
+{
+	switch (pixelFormat) {
+	/* RGB formats. */
+	case DRM_FORMAT_BGR888:
+		return V4L2PixelFormat(V4L2_PIX_FMT_RGB24);
+	case DRM_FORMAT_RGB888:
+		return V4L2PixelFormat(V4L2_PIX_FMT_BGR24);
+	case DRM_FORMAT_ABGR8888:
+		return V4L2PixelFormat(V4L2_PIX_FMT_RGBA32);
+	case DRM_FORMAT_ARGB8888:
+		return V4L2PixelFormat(V4L2_PIX_FMT_ABGR32);
+	case DRM_FORMAT_BGRA8888:
+		return V4L2PixelFormat(V4L2_PIX_FMT_ARGB32);
+	case DRM_FORMAT_RGBA8888:
+		return V4L2PixelFormat(V4L2_PIX_FMT_BGRA32);
+
+	/* YUV packed formats. */
+	case DRM_FORMAT_YUYV:
+		return V4L2PixelFormat(V4L2_PIX_FMT_YUYV);
+	case DRM_FORMAT_YVYU:
+		return V4L2PixelFormat(V4L2_PIX_FMT_YVYU);
+	case DRM_FORMAT_UYVY:
+		return V4L2PixelFormat(V4L2_PIX_FMT_UYVY);
+	case DRM_FORMAT_VYUY:
+		return V4L2PixelFormat(V4L2_PIX_FMT_VYUY);
+
+	/*
+	 * YUY planar formats.
+	 * \todo Add support for non-contiguous memory planes
+	 * \todo Select the format variant not only based on \a multiplanar but
+	 * also take into account the formats supported by the device.
+	 */
+	case DRM_FORMAT_NV16:
+		return V4L2PixelFormat(V4L2_PIX_FMT_NV16);
+	case DRM_FORMAT_NV61:
+		return V4L2PixelFormat(V4L2_PIX_FMT_NV61);
+	case DRM_FORMAT_NV12:
+		return V4L2PixelFormat(V4L2_PIX_FMT_NV12);
+	case DRM_FORMAT_NV21:
+		return V4L2PixelFormat(V4L2_PIX_FMT_NV21);
+
+	/* Greyscale formats. */
+	case DRM_FORMAT_R8:
+		return V4L2PixelFormat(V4L2_PIX_FMT_GREY);
+
+	/* Compressed formats. */
+	case DRM_FORMAT_MJPEG:
+		return V4L2PixelFormat(V4L2_PIX_FMT_MJPEG);
+
+	default:
+		LOG(V4L2, Warning)
+			<< "Unsupported pixel format "
+			<< pixelFormat.toString();
+		return V4L2PixelFormat();
+	}
+}
+
 } /* namespace libcamera */