Add the v4l2_hdmi_colorimetry() function so we have a single function
that determines the colorspace, YCbCr encoding, quantization range and
transfer function from the InfoFrame data.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
Tim, you can add this patch to your driver patch series and just call it.
Note that this colorspace information is what the HDMI gives you, if you
need to convert this than you will need to update this information accordingly
(e.g. lim to full range, 601 to 709 conversions, etc.) before giving it to
userspace.
Jose, I'm not sure if you need it in your driver, but this is probably useful
regardless.
Regards,
Hans
---
drivers/media/v4l2-core/v4l2-dv-timings.c | 141 ++++++++++++++++++++++++++++++
include/media/v4l2-dv-timings.h | 21 +++++
2 files changed, 162 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-dv-timings.c b/drivers/media/v4l2-core/v4l2-dv-timings.c
index 930f9c53a64e..0182d3d3f807 100644
--- a/drivers/media/v4l2-core/v4l2-dv-timings.c
+++ b/drivers/media/v4l2-core/v4l2-dv-timings.c
@@ -27,6 +27,7 @@
#include <linux/v4l2-dv-timings.h>
#include <media/v4l2-dv-timings.h>
#include <linux/math64.h>
+#include <linux/hdmi.h>
MODULE_AUTHOR("Hans Verkuil");
MODULE_DESCRIPTION("V4L2 DV Timings Helper Functions");
@@ -814,3 +815,143 @@ struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait)
return aspect;
}
EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio);
+
+/** v4l2_hdmi_rx_colorimetry - determine HDMI colorimetry information
+ * based on various InfoFrames.
+ * @avi - the AVI InfoFrame
+ * @hdmi - the HDMI Vendor InfoFrame, may be NULL
+ * @height - the frame height
+ *
+ * Determines the HDMI colorimetry information, i.e. how the HDMI
+ * pixel color data should be interpreted.
+ *
+ * Note that some of the newer features (DCI-P3, HDR) are not yet
+ * implemented: the hdmi.h header needs to be updated to the HDMI 2.0
+ * and CTA-861-G standards.
+ */
+struct v4l2_hdmi_colorimetry
+v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi,
+ const struct hdmi_vendor_infoframe *hdmi,
+ unsigned int height)
+{
+ struct v4l2_hdmi_colorimetry c = {
+ V4L2_COLORSPACE_SRGB,
+ V4L2_YCBCR_ENC_DEFAULT,
+ V4L2_QUANTIZATION_FULL_RANGE,
+ V4L2_XFER_FUNC_SRGB
+ };
+ bool is_ce = avi->video_code || (hdmi && hdmi->vic);
+ bool is_sdtv = height <= 576;
+ bool default_is_lim_range_rgb = avi->video_code > 1;
+
+ switch (avi->colorspace) {
+ case HDMI_COLORSPACE_RGB:
+ /* RGB pixel encoding */
+ switch (avi->colorimetry) {
+ case HDMI_COLORIMETRY_EXTENDED:
+ switch (avi->extended_colorimetry) {
+ case HDMI_EXTENDED_COLORIMETRY_ADOBE_RGB:
+ c.colorspace = V4L2_COLORSPACE_ADOBERGB;
+ c.xfer_func = V4L2_XFER_FUNC_ADOBERGB;
+ break;
+ case HDMI_EXTENDED_COLORIMETRY_BT2020:
+ c.colorspace = V4L2_COLORSPACE_BT2020;
+ c.xfer_func = V4L2_XFER_FUNC_709;
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ switch (avi->quantization_range) {
+ case HDMI_QUANTIZATION_RANGE_LIMITED:
+ c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
+ break;
+ case HDMI_QUANTIZATION_RANGE_FULL:
+ break;
+ default:
+ if (default_is_lim_range_rgb)
+ c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
+ break;
+ }
+ break;
+
+ default:
+ /* YCbCr pixel encoding */
+ c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
+ switch (avi->colorimetry) {
+ case HDMI_COLORIMETRY_NONE:
+ if (!is_ce)
+ break;
+ if (is_sdtv) {
+ c.colorspace = V4L2_COLORSPACE_SMPTE170M;
+ c.ycbcr_enc = V4L2_YCBCR_ENC_601;
+ } else {
+ c.colorspace = V4L2_COLORSPACE_REC709;
+ c.ycbcr_enc = V4L2_YCBCR_ENC_709;
+ }
+ c.xfer_func = V4L2_XFER_FUNC_709;
+ break;
+ case HDMI_COLORIMETRY_ITU_601:
+ c.colorspace = V4L2_COLORSPACE_SMPTE170M;
+ c.ycbcr_enc = V4L2_YCBCR_ENC_601;
+ c.xfer_func = V4L2_XFER_FUNC_709;
+ break;
+ case HDMI_COLORIMETRY_ITU_709:
+ c.colorspace = V4L2_COLORSPACE_REC709;
+ c.ycbcr_enc = V4L2_YCBCR_ENC_709;
+ c.xfer_func = V4L2_XFER_FUNC_709;
+ break;
+ case HDMI_COLORIMETRY_EXTENDED:
+ switch (avi->extended_colorimetry) {
+ case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
+ c.colorspace = V4L2_COLORSPACE_REC709;
+ c.ycbcr_enc = V4L2_YCBCR_ENC_XV709;
+ c.xfer_func = V4L2_XFER_FUNC_709;
+ break;
+ case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
+ c.colorspace = V4L2_COLORSPACE_REC709;
+ c.ycbcr_enc = V4L2_YCBCR_ENC_XV601;
+ c.xfer_func = V4L2_XFER_FUNC_709;
+ break;
+ case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
+ c.colorspace = V4L2_COLORSPACE_SRGB;
+ c.ycbcr_enc = V4L2_YCBCR_ENC_601;
+ c.xfer_func = V4L2_XFER_FUNC_SRGB;
+ break;
+ case HDMI_EXTENDED_COLORIMETRY_ADOBE_YCC_601:
+ c.colorspace = V4L2_COLORSPACE_ADOBERGB;
+ c.ycbcr_enc = V4L2_YCBCR_ENC_601;
+ c.xfer_func = V4L2_XFER_FUNC_ADOBERGB;
+ break;
+ case HDMI_EXTENDED_COLORIMETRY_BT2020:
+ c.colorspace = V4L2_COLORSPACE_BT2020;
+ c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020;
+ c.xfer_func = V4L2_XFER_FUNC_709;
+ break;
+ case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
+ c.colorspace = V4L2_COLORSPACE_BT2020;
+ c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020_CONST_LUM;
+ c.xfer_func = V4L2_XFER_FUNC_709;
+ break;
+ default: /* fall back to ITU_709 */
+ c.colorspace = V4L2_COLORSPACE_REC709;
+ c.ycbcr_enc = V4L2_YCBCR_ENC_709;
+ c.xfer_func = V4L2_XFER_FUNC_709;
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ /*
+ * YCC Quantization Range signaling is more-or-less broken,
+ * let's just ignore this.
+ */
+ break;
+ }
+ return c;
+}
+EXPORT_SYMBOL_GPL(v4l2_hdmi_rx_colorimetry);
diff --git a/include/media/v4l2-dv-timings.h b/include/media/v4l2-dv-timings.h
index 61a18893e004..835aef7f9ad4 100644
--- a/include/media/v4l2-dv-timings.h
+++ b/include/media/v4l2-dv-timings.h
@@ -223,5 +223,26 @@ static inline bool can_reduce_fps(struct v4l2_bt_timings *bt)
return false;
}
+/**
+ * struct v4l2_hdmi_rx_colorimetry - describes the HDMI colorimetry information
+ * @colorspace: enum v4l2_colorspace, the colorspace
+ * @ycbcr_enc: enum v4l2_ycbcr_encoding, Y'CbCr encoding
+ * @quantization: enum v4l2_quantization, colorspace quantization
+ * @xfer_func: enum v4l2_xfer_func, colorspace transfer function
+ */
+struct v4l2_hdmi_colorimetry {
+ enum v4l2_colorspace colorspace;
+ enum v4l2_ycbcr_encoding ycbcr_enc;
+ enum v4l2_quantization quantization;
+ enum v4l2_xfer_func xfer_func;
+};
+
+struct hdmi_avi_infoframe;
+struct hdmi_vendor_infoframe;
+
+struct v4l2_hdmi_colorimetry
+v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi,
+ const struct hdmi_vendor_infoframe *hdmi,
+ unsigned int height);
#endif
--
2.15.0
