soc_mediabus.h
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/*
* SoC-camera Media Bus API extensions
*
* Copyright (C) 2009, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef SOC_MEDIABUS_H
#define SOC_MEDIABUS_H
#include <linux/videodev2.h>
#include <linux/v4l2-mediabus.h>
/**
* enum soc_mbus_packing - data packing types on the media-bus
* @SOC_MBUS_PACKING_NONE: no packing, bit-for-bit transfer to RAM, one
* sample represents one pixel
* @SOC_MBUS_PACKING_2X8_PADHI: 16 bits transferred in 2 8-bit samples, in the
* possibly incomplete byte high bits are padding
* @SOC_MBUS_PACKING_2X8_PADLO: as above, but low bits are padding
* @SOC_MBUS_PACKING_EXTEND16: sample width (e.g., 10 bits) has to be extended
* to 16 bits
* @SOC_MBUS_PACKING_VARIABLE: compressed formats with variable packing
* @SOC_MBUS_PACKING_1_5X8: used for packed YUV 4:2:0 formats, where 4
* pixels occupy 6 bytes in RAM
* @SOC_MBUS_PACKING_EXTEND32: sample width (e.g., 24 bits) has to be extended
* to 32 bits
*/
enum soc_mbus_packing {
SOC_MBUS_PACKING_NONE,
SOC_MBUS_PACKING_2X8_PADHI,
SOC_MBUS_PACKING_2X8_PADLO,
SOC_MBUS_PACKING_EXTEND16,
SOC_MBUS_PACKING_VARIABLE,
SOC_MBUS_PACKING_1_5X8,
SOC_MBUS_PACKING_EXTEND32,
};
/**
* enum soc_mbus_order - sample order on the media bus
* @SOC_MBUS_ORDER_LE: least significant sample first
* @SOC_MBUS_ORDER_BE: most significant sample first
*/
enum soc_mbus_order {
SOC_MBUS_ORDER_LE,
SOC_MBUS_ORDER_BE,
};
/**
* enum soc_mbus_layout - planes layout in memory
* @SOC_MBUS_LAYOUT_PACKED: color components packed
* @SOC_MBUS_LAYOUT_PLANAR_2Y_U_V: YUV components stored in 3 planes (4:2:2)
* @SOC_MBUS_LAYOUT_PLANAR_2Y_C: YUV components stored in a luma and a
* chroma plane (C plane is half the size
* of Y plane)
* @SOC_MBUS_LAYOUT_PLANAR_Y_C: YUV components stored in a luma and a
* chroma plane (C plane is the same size
* as Y plane)
*/
enum soc_mbus_layout {
SOC_MBUS_LAYOUT_PACKED = 0,
SOC_MBUS_LAYOUT_PLANAR_2Y_U_V,
SOC_MBUS_LAYOUT_PLANAR_2Y_C,
SOC_MBUS_LAYOUT_PLANAR_Y_C,
};
/**
* struct soc_mbus_pixelfmt - Data format on the media bus
* @name: Name of the format
* @fourcc: Fourcc code, that will be obtained if the data is
* stored in memory in the following way:
* @packing: Type of sample-packing, that has to be used
* @order: Sample order when storing in memory
* @bits_per_sample: How many bits the bridge has to sample
*/
struct soc_mbus_pixelfmt {
const char *name;
u32 fourcc;
enum soc_mbus_packing packing;
enum soc_mbus_order order;
enum soc_mbus_layout layout;
u8 bits_per_sample;
};
/**
* struct soc_mbus_lookup - Lookup FOURCC IDs by mediabus codes for pass-through
* @code: mediabus pixel-code
* @fmt: pixel format description
*/
struct soc_mbus_lookup {
enum v4l2_mbus_pixelcode code;
struct soc_mbus_pixelfmt fmt;
};
const struct soc_mbus_pixelfmt *soc_mbus_find_fmtdesc(
enum v4l2_mbus_pixelcode code,
const struct soc_mbus_lookup *lookup,
int n);
const struct soc_mbus_pixelfmt *soc_mbus_get_fmtdesc(
enum v4l2_mbus_pixelcode code);
s32 soc_mbus_bytes_per_line(u32 width, const struct soc_mbus_pixelfmt *mf);
s32 soc_mbus_image_size(const struct soc_mbus_pixelfmt *mf,
u32 bytes_per_line, u32 height);
int soc_mbus_samples_per_pixel(const struct soc_mbus_pixelfmt *mf,
unsigned int *numerator, unsigned int *denominator);
unsigned int soc_mbus_config_compatible(const struct v4l2_mbus_config *cfg,
unsigned int flags);
#endif