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			/*
			* pixel format descriptor
			* Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
			*
			* This file is part of FFmpeg.
			*
			* FFmpeg is free software; you can redistribute it and/or
			* modify it under the terms of the GNU Lesser General Public
			* License as published by the Free Software Foundation; either
			* version 2.1 of the License, or (at your option) any later version.
			*
			* FFmpeg is distributed in the hope that it will be useful,
			* but WITHOUT ANY WARRANTY; without even the implied warranty of
			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
			* Lesser General Public License for more details.
			*
			* You should have received a copy of the GNU Lesser General Public
			* License along with FFmpeg; if not, write to the Free Software
			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
			*/

			#ifndef AVUTIL_PIXDESC_H
			#define AVUTIL_PIXDESC_H

			#include <inttypes.h>

			#include "attributes.h"
			#include "pixfmt.h"
			#include "version.h"

			typedef struct AVComponentDescriptor {
			/**
			* Which of the 4 planes contains the component.
			*/
			int plane;

			/**
			* Number of elements between 2 horizontally consecutive pixels.
			* Elements are bits for bitstream formats, bytes otherwise.
			*/
			int step;

			/**
			* Number of elements before the component of the first pixel.
			* Elements are bits for bitstream formats, bytes otherwise.
			*/
			int offset;

			/**
			* Number of least significant bits that must be shifted away
			* to get the value.
			*/
			int shift;

			/**
			* Number of bits in the component.
			*/
			int depth;

			#if FF_API_PLUS1_MINUS1
			/** deprecated, use step instead */
			attribute_deprecated int step_minus1;

			/** deprecated, use depth instead */
			attribute_deprecated int depth_minus1;

			/** deprecated, use offset instead */
			attribute_deprecated int offset_plus1;
			#endif
			} AVComponentDescriptor;

			/**
			* Descriptor that unambiguously describes how the bits of a pixel are
			* stored in the up to 4 data planes of an image. It also stores the
			* subsampling factors and number of components.
			*
			* @note This is separate of the colorspace (RGB, YCbCr, YPbPr, JPEG-style YUV
			* and all the YUV variants) AVPixFmtDescriptor just stores how values
			* are stored not what these values represent.
			*/
			typedef struct AVPixFmtDescriptor {
			const char *name;
			uint8_t nb_components; ///< The number of components each pixel has, (1-4)

			/**
			* Amount to shift the luma width right to find the chroma width.
			* For YV12 this is 1 for example.
			* chroma_width = AV_CEIL_RSHIFT(luma_width, log2_chroma_w)
			* The note above is needed to ensure rounding up.
			* This value only refers to the chroma components.
			*/
			uint8_t log2_chroma_w;

			/**
			* Amount to shift the luma height right to find the chroma height.
			* For YV12 this is 1 for example.
			* chroma_height= AV_CEIL_RSHIFT(luma_height, log2_chroma_h)
			* The note above is needed to ensure rounding up.
			* This value only refers to the chroma components.
			*/
			uint8_t log2_chroma_h;

			/**
			* Combination of AV_PIX_FMT_FLAG_... flags.
			*/
			uint64_t flags;

			/**
			* Parameters that describe how pixels are packed.
			* If the format has 1 or 2 components, then luma is 0.
			* If the format has 3 or 4 components:
			* if the RGB flag is set then 0 is red, 1 is green and 2 is blue;
			* otherwise 0 is luma, 1 is chroma-U and 2 is chroma-V.
			*
			* If present, the Alpha channel is always the last component.
			*/
			AVComponentDescriptor comp[4];

			/**
			* Alternative comma-separated names.
			*/
			const char *alias;
			} AVPixFmtDescriptor;

			/**
			* Pixel format is big-endian.
			*/
			#define AV_PIX_FMT_FLAG_BE (1 << 0)
			/**
			* Pixel format has a palette in data[1], values are indexes in this palette.
			*/
			#define AV_PIX_FMT_FLAG_PAL (1 << 1)
			/**
			* All values of a component are bit-wise packed end to end.
			*/
			#define AV_PIX_FMT_FLAG_BITSTREAM (1 << 2)
			/**
			* Pixel format is an HW accelerated format.
			*/
			#define AV_PIX_FMT_FLAG_HWACCEL (1 << 3)
			/**
			* At least one pixel component is not in the first data plane.
			*/
			#define AV_PIX_FMT_FLAG_PLANAR (1 << 4)
			/**
			* The pixel format contains RGB-like data (as opposed to YUV/grayscale).
			*/
			#define AV_PIX_FMT_FLAG_RGB (1 << 5)

			/**
			* The pixel format is "pseudo-paletted". This means that it contains a
			* fixed palette in the 2nd plane but the palette is fixed/constant for each
			* PIX_FMT. This allows interpreting the data as if it was PAL8, which can
			* in some cases be simpler. Or the data can be interpreted purely based on
			* the pixel format without using the palette.
			* An example of a pseudo-paletted format is AV_PIX_FMT_GRAY8
			*
			* @deprecated This flag is deprecated, and will be removed. When it is removed,
			* the extra palette allocation in AVFrame.data[1] is removed as well. Only
			* actual paletted formats (as indicated by AV_PIX_FMT_FLAG_PAL) will have a
			* palette. Starting with FFmpeg versions which have this flag deprecated, the
			* extra "pseudo" palette is already ignored, and API users are not required to
			* allocate a palette for AV_PIX_FMT_FLAG_PSEUDOPAL formats (it was required
			* before the deprecation, though).
			*/
			#define AV_PIX_FMT_FLAG_PSEUDOPAL (1 << 6)

			/**
			* The pixel format has an alpha channel. This is set on all formats that
			* support alpha in some way, including AV_PIX_FMT_PAL8. The alpha is always
			* straight, never pre-multiplied.
			*
			* If a codec or a filter does not support alpha, it should set all alpha to
			* opaque, or use the equivalent pixel formats without alpha component, e.g.
			* AV_PIX_FMT_RGB0 (or AV_PIX_FMT_RGB24 etc.) instead of AV_PIX_FMT_RGBA.
			*/
			#define AV_PIX_FMT_FLAG_ALPHA (1 << 7)

			/**
			* The pixel format is following a Bayer pattern
			*/
			#define AV_PIX_FMT_FLAG_BAYER (1 << 8)

			/**
			* The pixel format contains IEEE-754 floating point values. Precision (double,
			* single, or half) should be determined by the pixel size (64, 32, or 16 bits).
			*/
			#define AV_PIX_FMT_FLAG_FLOAT (1 << 9)

			/**
			* Return the number of bits per pixel used by the pixel format
			* described by pixdesc. Note that this is not the same as the number
			* of bits per sample.
			*
			* The returned number of bits refers to the number of bits actually
			* used for storing the pixel information, that is padding bits are
			* not counted.
			*/
			int av_get_bits_per_pixel(const AVPixFmtDescriptor *pixdesc);

			/**
			* Return the number of bits per pixel for the pixel format
			* described by pixdesc, including any padding or unused bits.
			*/
			int av_get_padded_bits_per_pixel(const AVPixFmtDescriptor *pixdesc);

			/**
			* @return a pixel format descriptor for provided pixel format or NULL if
			* this pixel format is unknown.
			*/
			const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt);

			/**
			* Iterate over all pixel format descriptors known to libavutil.
			*
			* @param prev previous descriptor. NULL to get the first descriptor.
			*
			* @return next descriptor or NULL after the last descriptor
			*/
			const AVPixFmtDescriptor av_pix_fmt_desc_next(const AVPixFmtDescriptor prev);

			/**
			* @return an AVPixelFormat id described by desc, or AV_PIX_FMT_NONE if desc
			* is not a valid pointer to a pixel format descriptor.
			*/
			enum AVPixelFormat av_pix_fmt_desc_get_id(const AVPixFmtDescriptor *desc);

			/**
			* Utility function to access log2_chroma_w log2_chroma_h from
			* the pixel format AVPixFmtDescriptor.
			*
			* @param[in] pix_fmt the pixel format
			* @param[out] h_shift store log2_chroma_w (horizontal/width shift)
			* @param[out] v_shift store log2_chroma_h (vertical/height shift)
			*
			* @return 0 on success, AVERROR(ENOSYS) on invalid or unknown pixel format
			*/
			int av_pix_fmt_get_chroma_sub_sample(enum AVPixelFormat pix_fmt,
			int h_shift, int v_shift);

			/**
			* @return number of planes in pix_fmt, a negative AVERROR if pix_fmt is not a
			* valid pixel format.
			*/
			int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt);

			/**
			* @return the name for provided color range or NULL if unknown.
			*/
			const char *av_color_range_name(enum AVColorRange range);

			/**
			* @return the AVColorRange value for name or an AVError if not found.
			*/
			int av_color_range_from_name(const char *name);

			/**
			* @return the name for provided color primaries or NULL if unknown.
			*/
			const char *av_color_primaries_name(enum AVColorPrimaries primaries);

			/**
			* @return the AVColorPrimaries value for name or an AVError if not found.
			*/
			int av_color_primaries_from_name(const char *name);

			/**
			* @return the name for provided color transfer or NULL if unknown.
			*/
			const char *av_color_transfer_name(enum AVColorTransferCharacteristic transfer);

			/**
			* @return the AVColorTransferCharacteristic value for name or an AVError if not found.
			*/
			int av_color_transfer_from_name(const char *name);

			/**
			* @return the name for provided color space or NULL if unknown.
			*/
			const char *av_color_space_name(enum AVColorSpace space);

			/**
			* @return the AVColorSpace value for name or an AVError if not found.
			*/
			int av_color_space_from_name(const char *name);

			/**
			* @return the name for provided chroma location or NULL if unknown.
			*/
			const char *av_chroma_location_name(enum AVChromaLocation location);

			/**
			* @return the AVChromaLocation value for name or an AVError if not found.
			*/
			int av_chroma_location_from_name(const char *name);

			/**
			* Return the pixel format corresponding to name.
			*
			* If there is no pixel format with name name, then looks for a
			* pixel format with the name corresponding to the native endian
			* format of name.
			* For example in a little-endian system, first looks for "gray16",
			* then for "gray16le".
			*
			* Finally if no pixel format has been found, returns AV_PIX_FMT_NONE.
			*/
			enum AVPixelFormat av_get_pix_fmt(const char *name);

			/**
			* Return the short name for a pixel format, NULL in case pix_fmt is
			* unknown.
			*
			* @see av_get_pix_fmt(), av_get_pix_fmt_string()
			*/
			const char *av_get_pix_fmt_name(enum AVPixelFormat pix_fmt);

			/**
			* Print in buf the string corresponding to the pixel format with
			* number pix_fmt, or a header if pix_fmt is negative.
			*
			* @param buf the buffer where to write the string
			* @param buf_size the size of buf
			* @param pix_fmt the number of the pixel format to print the
			* corresponding info string, or a negative value to print the
			* corresponding header.
			*/
			char av_get_pix_fmt_string(char buf, int buf_size,
			enum AVPixelFormat pix_fmt);

			/**
			* Read a line from an image, and write the values of the
			* pixel format component c to dst.
			*
			* @param data the array containing the pointers to the planes of the image
			* @param linesize the array containing the linesizes of the image
			* @param desc the pixel format descriptor for the image
			* @param x the horizontal coordinate of the first pixel to read
			* @param y the vertical coordinate of the first pixel to read
			* @param w the width of the line to read, that is the number of
			* values to write to dst
			* @param read_pal_component if not zero and the format is a paletted
			* format writes the values corresponding to the palette
			* component c in data[1] to dst, rather than the palette indexes in
			* data[0]. The behavior is undefined if the format is not paletted.
			* @param dst_element_size size of elements in dst array (2 or 4 byte)
			*/
			void av_read_image_line2(void dst, const uint8_t data[4],
			const int linesize[4], const AVPixFmtDescriptor *desc,
			int x, int y, int c, int w, int read_pal_component,
			int dst_element_size);

			void av_read_image_line(uint16_t dst, const uint8_t data[4],
			const int linesize[4], const AVPixFmtDescriptor *desc,
			int x, int y, int c, int w, int read_pal_component);

			/**
			* Write the values from src to the pixel format component c of an
			* image line.
			*
			* @param src array containing the values to write
			* @param data the array containing the pointers to the planes of the
			* image to write into. It is supposed to be zeroed.
			* @param linesize the array containing the linesizes of the image
			* @param desc the pixel format descriptor for the image
			* @param x the horizontal coordinate of the first pixel to write
			* @param y the vertical coordinate of the first pixel to write
			* @param w the width of the line to write, that is the number of
			* values to write to the image line
			* @param src_element_size size of elements in src array (2 or 4 byte)
			*/
			void av_write_image_line2(const void src, uint8_t data[4],
			const int linesize[4], const AVPixFmtDescriptor *desc,
			int x, int y, int c, int w, int src_element_size);

			void av_write_image_line(const uint16_t src, uint8_t data[4],
			const int linesize[4], const AVPixFmtDescriptor *desc,
			int x, int y, int c, int w);

			/**
			* Utility function to swap the endianness of a pixel format.
			*
			* @param[in] pix_fmt the pixel format
			*
			* @return pixel format with swapped endianness if it exists,
			* otherwise AV_PIX_FMT_NONE
			*/
			enum AVPixelFormat av_pix_fmt_swap_endianness(enum AVPixelFormat pix_fmt);

			#define FF_LOSS_RESOLUTION 0x0001 /*< loss due to resolution change /
			#define FF_LOSS_DEPTH 0x0002 /*< loss due to color depth change /
			#define FF_LOSS_COLORSPACE 0x0004 /*< loss due to color space conversion /
			#define FF_LOSS_ALPHA 0x0008 /*< loss of alpha bits /
			#define FF_LOSS_COLORQUANT 0x0010 /*< loss due to color quantization /
			#define FF_LOSS_CHROMA 0x0020 /*< loss of chroma (e.g. RGB to gray conversion) /

			/**
			* Compute what kind of losses will occur when converting from one specific
			* pixel format to another.
			* When converting from one pixel format to another, information loss may occur.
			* For example, when converting from RGB24 to GRAY, the color information will
			* be lost. Similarly, other losses occur when converting from some formats to
			* other formats. These losses can involve loss of chroma, but also loss of
			* resolution, loss of color depth, loss due to the color space conversion, loss
			* of the alpha bits or loss due to color quantization.
			* av_get_fix_fmt_loss() informs you about the various types of losses
			* which will occur when converting from one pixel format to another.
			*
			* @param[in] dst_pix_fmt destination pixel format
			* @param[in] src_pix_fmt source pixel format
			* @param[in] has_alpha Whether the source pixel format alpha channel is used.
			* @return Combination of flags informing you what kind of losses will occur
			* (maximum loss for an invalid dst_pix_fmt).
			*/
			int av_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt,
			enum AVPixelFormat src_pix_fmt,
			int has_alpha);

			/**
			* Compute what kind of losses will occur when converting from one specific
			* pixel format to another.
			* When converting from one pixel format to another, information loss may occur.
			* For example, when converting from RGB24 to GRAY, the color information will
			* be lost. Similarly, other losses occur when converting from some formats to
			* other formats. These losses can involve loss of chroma, but also loss of
			* resolution, loss of color depth, loss due to the color space conversion, loss
			* of the alpha bits or loss due to color quantization.
			* av_get_fix_fmt_loss() informs you about the various types of losses
			* which will occur when converting from one pixel format to another.
			*
			* @param[in] dst_pix_fmt destination pixel format
			* @param[in] src_pix_fmt source pixel format
			* @param[in] has_alpha Whether the source pixel format alpha channel is used.
			* @return Combination of flags informing you what kind of losses will occur
			* (maximum loss for an invalid dst_pix_fmt).
			*/
			enum AVPixelFormat av_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
			enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);

			#endif /* AVUTIL_PIXDESC_H */