441 lines
16 KiB
C
441 lines
16 KiB
C
/*
|
|
* 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"
|
|
|
|
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;
|
|
} 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 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)
|
|
|
|
/**
|
|
* The pixel format contains XYZ-like data (as opposed to YUV/RGB/grayscale).
|
|
*/
|
|
#define AV_PIX_FMT_FLAG_XYZ (1 << 10)
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* Converts AVChromaLocation to swscale x/y chroma position.
|
|
*
|
|
* The positions represent the chroma (0,0) position in a coordinates system
|
|
* with luma (0,0) representing the origin and luma(1,1) representing 256,256
|
|
*
|
|
* @param xpos horizontal chroma sample position
|
|
* @param ypos vertical chroma sample position
|
|
*/
|
|
int av_chroma_location_enum_to_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
|
|
|
|
/**
|
|
* Converts swscale x/y chroma position to AVChromaLocation.
|
|
*
|
|
* The positions represent the chroma (0,0) position in a coordinates system
|
|
* with luma (0,0) representing the origin and luma(1,1) representing 256,256
|
|
*
|
|
* @param xpos horizontal chroma sample position
|
|
* @param ypos vertical chroma sample position
|
|
*/
|
|
enum AVChromaLocation av_chroma_location_pos_to_enum(int xpos, int ypos);
|
|
|
|
/**
|
|
* 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) */
|
|
#define FF_LOSS_EXCESS_RESOLUTION 0x0040 /**< loss due to unneeded extra resolution */
|
|
#define FF_LOSS_EXCESS_DEPTH 0x0080 /**< loss due to unneeded extra color depth */
|
|
|
|
|
|
/**
|
|
* 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 */
|