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