linux/drivers/media/platform/allegro-dvt/nal-h264.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2019 Pengutronix, Michael Tretter <[email protected]>
 *
 * Convert NAL units between raw byte sequence payloads (RBSP) and C structs.
 */

#ifndef __NAL_H264_H__
#define __NAL_H264_H__

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/v4l2-controls.h>
#include <linux/videodev2.h>

/*
 * struct nal_h264_hrd_parameters - HRD parameters
 *
 * C struct representation of the sequence parameter set NAL unit as defined by
 * Rec. ITU-T H.264 (04/2017) E.1.2 HRD parameters syntax.
 */
struct nal_h264_hrd_parameters { … };

/*
 * struct nal_h264_vui_parameters - VUI parameters
 *
 * C struct representation of the VUI parameters as defined by Rec. ITU-T
 * H.264 (04/2017) E.1.1 VUI parameters syntax.
 */
struct nal_h264_vui_parameters { … };

/*
 * struct nal_h264_sps - Sequence parameter set
 *
 * C struct representation of the sequence parameter set NAL unit as defined by
 * Rec. ITU-T H.264 (04/2017) 7.3.2.1.1 Sequence parameter set data syntax.
 */
struct nal_h264_sps { … };

/*
 * struct nal_h264_pps - Picture parameter set
 *
 * C struct representation of the picture parameter set NAL unit as defined by
 * Rec. ITU-T H.264 (04/2017) 7.3.2.2 Picture parameter set RBSP syntax.
 */
struct nal_h264_pps { … };

/**
 * nal_h264_profile() - Get profile_idc for v4l2 h264 profile
 * @profile: the profile as &enum v4l2_mpeg_video_h264_profile
 *
 * Convert the &enum v4l2_mpeg_video_h264_profile to profile_idc as specified
 * in Rec. ITU-T H.264 (04/2017) A.2.
 *
 * Return: the profile_idc for the passed level
 */
static inline int nal_h264_profile(enum v4l2_mpeg_video_h264_profile profile)
{ … }

/**
 * nal_h264_level() - Get level_idc for v4l2 h264 level
 * @level: the level as &enum v4l2_mpeg_video_h264_level
 *
 * Convert the &enum v4l2_mpeg_video_h264_level to level_idc as specified in
 * Rec. ITU-T H.264 (04/2017) A.3.2.
 *
 * Return: the level_idc for the passed level
 */
static inline int nal_h264_level(enum v4l2_mpeg_video_h264_level level)
{ … }

/**
 * nal_h264_full_range() - Get video_full_range_flag for v4l2 quantization
 * @quantization: the quantization type as &enum v4l2_quantization
 *
 * Convert the &enum v4l2_quantization to video_full_range_flag as specified in
 * Rec. ITU-T H.264 (04/2017) E.2.1.
 *
 * Return: the video_full_range_flag value for the passed quantization
 */
static inline int nal_h264_full_range(enum v4l2_quantization quantization)
{ … }

/**
 * nal_h264_color_primaries() - Get color_primaries for v4l2 colorspace
 * @colorspace: the color space as &enum v4l2_colorspace
 *
 * Convert the &enum v4l2_colorspace to color_primaries as specified in
 * Rec. ITU-T H.264 (04/2017) E.2.1.
 *
 * Return: the color_primaries value for the passed colorspace
 */
static inline int nal_h264_color_primaries(enum v4l2_colorspace colorspace)
{ … }

/**
 * nal_h264_transfer_characteristics() - Get transfer_characteristics for v4l2 xfer_func
 * @colorspace: the color space as &enum v4l2_colorspace
 * @xfer_func: the transfer function as &enum v4l2_xfer_func
 *
 * Convert the &enum v4l2_xfer_func to transfer_characteristics as specified in
 * Rec. ITU-T H.264 (04/2017) E.2.1.
 *
 * Return: the transfer_characteristics value for the passed transfer function
 */
static inline int nal_h264_transfer_characteristics(enum v4l2_colorspace colorspace,
						    enum v4l2_xfer_func xfer_func)
{ … }

/**
 * nal_h264_matrix_coeffs() - Get matrix_coefficients for v4l2 v4l2_ycbcr_encoding
 * @colorspace: the color space as &enum v4l2_colorspace
 * @ycbcr_encoding: the ycbcr encoding as &enum v4l2_ycbcr_encoding
 *
 * Convert the &enum v4l2_ycbcr_encoding to matrix_coefficients as specified in
 * Rec. ITU-T H.264 (04/2017) E.2.1.
 *
 * Return: the matrix_coefficients value for the passed encoding
 */
static inline int nal_h264_matrix_coeffs(enum v4l2_colorspace colorspace,
					 enum v4l2_ycbcr_encoding ycbcr_encoding)
{ … }

ssize_t nal_h264_write_sps(const struct device *dev,
			   void *dest, size_t n, struct nal_h264_sps *sps);
ssize_t nal_h264_read_sps(const struct device *dev,
			  struct nal_h264_sps *sps, void *src, size_t n);
void nal_h264_print_sps(const struct device *dev, struct nal_h264_sps *sps);

ssize_t nal_h264_write_pps(const struct device *dev,
			   void *dest, size_t n, struct nal_h264_pps *pps);
ssize_t nal_h264_read_pps(const struct device *dev,
			  struct nal_h264_pps *pps, void *src, size_t n);
void nal_h264_print_pps(const struct device *dev, struct nal_h264_pps *pps);

ssize_t nal_h264_write_filler(const struct device *dev, void *dest, size_t n);
ssize_t nal_h264_read_filler(const struct device *dev, void *src, size_t n);

#endif /* __NAL_H264_H__ */