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Commit 357a856a authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

media: v4l2-dv-timings: add v4l2_hdmi_colorimetry() 



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: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent bd2a0f08

drivers/media/v4l2-core/v4l2-dv-timings.c

+141 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#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");
@@ -801,3 +802,143 @@ 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);

include/media/v4l2-dv-timings.h

+21 −0
Original line number Diff line number Diff line
@@ -212,5 +212,26 @@ 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