mirror of
https://github.com/DrKLO/Telegram.git
synced 2024-12-23 15:00:50 +01:00
336 lines
12 KiB
C
336 lines
12 KiB
C
/*
|
||
* Copyright (C) 2001-2011 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 SWSCALE_SWSCALE_H
|
||
#define SWSCALE_SWSCALE_H
|
||
|
||
/**
|
||
* @file
|
||
* @ingroup libsws
|
||
* external API header
|
||
*/
|
||
|
||
#include <stdint.h>
|
||
|
||
#include "libavutil/avutil.h"
|
||
#include "libavutil/log.h"
|
||
#include "libavutil/pixfmt.h"
|
||
#include "version.h"
|
||
|
||
/**
|
||
* @defgroup libsws libswscale
|
||
* Color conversion and scaling library.
|
||
*
|
||
* @{
|
||
*
|
||
* Return the LIBSWSCALE_VERSION_INT constant.
|
||
*/
|
||
unsigned swscale_version(void);
|
||
|
||
/**
|
||
* Return the libswscale build-time configuration.
|
||
*/
|
||
const char *swscale_configuration(void);
|
||
|
||
/**
|
||
* Return the libswscale license.
|
||
*/
|
||
const char *swscale_license(void);
|
||
|
||
/* values for the flags, the stuff on the command line is different */
|
||
#define SWS_FAST_BILINEAR 1
|
||
#define SWS_BILINEAR 2
|
||
#define SWS_BICUBIC 4
|
||
#define SWS_X 8
|
||
#define SWS_POINT 0x10
|
||
#define SWS_AREA 0x20
|
||
#define SWS_BICUBLIN 0x40
|
||
#define SWS_GAUSS 0x80
|
||
#define SWS_SINC 0x100
|
||
#define SWS_LANCZOS 0x200
|
||
#define SWS_SPLINE 0x400
|
||
|
||
#define SWS_SRC_V_CHR_DROP_MASK 0x30000
|
||
#define SWS_SRC_V_CHR_DROP_SHIFT 16
|
||
|
||
#define SWS_PARAM_DEFAULT 123456
|
||
|
||
#define SWS_PRINT_INFO 0x1000
|
||
|
||
//the following 3 flags are not completely implemented
|
||
//internal chrominance subsampling info
|
||
#define SWS_FULL_CHR_H_INT 0x2000
|
||
//input subsampling info
|
||
#define SWS_FULL_CHR_H_INP 0x4000
|
||
#define SWS_DIRECT_BGR 0x8000
|
||
#define SWS_ACCURATE_RND 0x40000
|
||
#define SWS_BITEXACT 0x80000
|
||
#define SWS_ERROR_DIFFUSION 0x800000
|
||
|
||
#define SWS_MAX_REDUCE_CUTOFF 0.002
|
||
|
||
#define SWS_CS_ITU709 1
|
||
#define SWS_CS_FCC 4
|
||
#define SWS_CS_ITU601 5
|
||
#define SWS_CS_ITU624 5
|
||
#define SWS_CS_SMPTE170M 5
|
||
#define SWS_CS_SMPTE240M 7
|
||
#define SWS_CS_DEFAULT 5
|
||
#define SWS_CS_BT2020 9
|
||
|
||
/**
|
||
* Return a pointer to yuv<->rgb coefficients for the given colorspace
|
||
* suitable for sws_setColorspaceDetails().
|
||
*
|
||
* @param colorspace One of the SWS_CS_* macros. If invalid,
|
||
* SWS_CS_DEFAULT is used.
|
||
*/
|
||
const int *sws_getCoefficients(int colorspace);
|
||
|
||
// when used for filters they must have an odd number of elements
|
||
// coeffs cannot be shared between vectors
|
||
typedef struct SwsVector {
|
||
double *coeff; ///< pointer to the list of coefficients
|
||
int length; ///< number of coefficients in the vector
|
||
} SwsVector;
|
||
|
||
// vectors can be shared
|
||
typedef struct SwsFilter {
|
||
SwsVector *lumH;
|
||
SwsVector *lumV;
|
||
SwsVector *chrH;
|
||
SwsVector *chrV;
|
||
} SwsFilter;
|
||
|
||
struct SwsContext;
|
||
|
||
/**
|
||
* Return a positive value if pix_fmt is a supported input format, 0
|
||
* otherwise.
|
||
*/
|
||
int sws_isSupportedInput(enum AVPixelFormat pix_fmt);
|
||
|
||
/**
|
||
* Return a positive value if pix_fmt is a supported output format, 0
|
||
* otherwise.
|
||
*/
|
||
int sws_isSupportedOutput(enum AVPixelFormat pix_fmt);
|
||
|
||
/**
|
||
* @param[in] pix_fmt the pixel format
|
||
* @return a positive value if an endianness conversion for pix_fmt is
|
||
* supported, 0 otherwise.
|
||
*/
|
||
int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt);
|
||
|
||
/**
|
||
* Allocate an empty SwsContext. This must be filled and passed to
|
||
* sws_init_context(). For filling see AVOptions, options.c and
|
||
* sws_setColorspaceDetails().
|
||
*/
|
||
struct SwsContext *sws_alloc_context(void);
|
||
|
||
/**
|
||
* Initialize the swscaler context sws_context.
|
||
*
|
||
* @return zero or positive value on success, a negative value on
|
||
* error
|
||
*/
|
||
av_warn_unused_result
|
||
int sws_init_context(struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter);
|
||
|
||
/**
|
||
* Free the swscaler context swsContext.
|
||
* If swsContext is NULL, then does nothing.
|
||
*/
|
||
void sws_freeContext(struct SwsContext *swsContext);
|
||
|
||
/**
|
||
* Allocate and return an SwsContext. You need it to perform
|
||
* scaling/conversion operations using sws_scale().
|
||
*
|
||
* @param srcW the width of the source image
|
||
* @param srcH the height of the source image
|
||
* @param srcFormat the source image format
|
||
* @param dstW the width of the destination image
|
||
* @param dstH the height of the destination image
|
||
* @param dstFormat the destination image format
|
||
* @param flags specify which algorithm and options to use for rescaling
|
||
* @param param extra parameters to tune the used scaler
|
||
* For SWS_BICUBIC param[0] and [1] tune the shape of the basis
|
||
* function, param[0] tunes f(1) and param[1] f´(1)
|
||
* For SWS_GAUSS param[0] tunes the exponent and thus cutoff
|
||
* frequency
|
||
* For SWS_LANCZOS param[0] tunes the width of the window function
|
||
* @return a pointer to an allocated context, or NULL in case of error
|
||
* @note this function is to be removed after a saner alternative is
|
||
* written
|
||
*/
|
||
struct SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,
|
||
int dstW, int dstH, enum AVPixelFormat dstFormat,
|
||
int flags, SwsFilter *srcFilter,
|
||
SwsFilter *dstFilter, const double *param);
|
||
|
||
/**
|
||
* Scale the image slice in srcSlice and put the resulting scaled
|
||
* slice in the image in dst. A slice is a sequence of consecutive
|
||
* rows in an image.
|
||
*
|
||
* Slices have to be provided in sequential order, either in
|
||
* top-bottom or bottom-top order. If slices are provided in
|
||
* non-sequential order the behavior of the function is undefined.
|
||
*
|
||
* @param c the scaling context previously created with
|
||
* sws_getContext()
|
||
* @param srcSlice the array containing the pointers to the planes of
|
||
* the source slice
|
||
* @param srcStride the array containing the strides for each plane of
|
||
* the source image
|
||
* @param srcSliceY the position in the source image of the slice to
|
||
* process, that is the number (counted starting from
|
||
* zero) in the image of the first row of the slice
|
||
* @param srcSliceH the height of the source slice, that is the number
|
||
* of rows in the slice
|
||
* @param dst the array containing the pointers to the planes of
|
||
* the destination image
|
||
* @param dstStride the array containing the strides for each plane of
|
||
* the destination image
|
||
* @return the height of the output slice
|
||
*/
|
||
int sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[],
|
||
const int srcStride[], int srcSliceY, int srcSliceH,
|
||
uint8_t *const dst[], const int dstStride[]);
|
||
|
||
/**
|
||
* @param dstRange flag indicating the while-black range of the output (1=jpeg / 0=mpeg)
|
||
* @param srcRange flag indicating the while-black range of the input (1=jpeg / 0=mpeg)
|
||
* @param table the yuv2rgb coefficients describing the output yuv space, normally ff_yuv2rgb_coeffs[x]
|
||
* @param inv_table the yuv2rgb coefficients describing the input yuv space, normally ff_yuv2rgb_coeffs[x]
|
||
* @param brightness 16.16 fixed point brightness correction
|
||
* @param contrast 16.16 fixed point contrast correction
|
||
* @param saturation 16.16 fixed point saturation correction
|
||
* @return -1 if not supported
|
||
*/
|
||
int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
|
||
int srcRange, const int table[4], int dstRange,
|
||
int brightness, int contrast, int saturation);
|
||
|
||
/**
|
||
* @return -1 if not supported
|
||
*/
|
||
int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
|
||
int *srcRange, int **table, int *dstRange,
|
||
int *brightness, int *contrast, int *saturation);
|
||
|
||
/**
|
||
* Allocate and return an uninitialized vector with length coefficients.
|
||
*/
|
||
SwsVector *sws_allocVec(int length);
|
||
|
||
/**
|
||
* Return a normalized Gaussian curve used to filter stuff
|
||
* quality = 3 is high quality, lower is lower quality.
|
||
*/
|
||
SwsVector *sws_getGaussianVec(double variance, double quality);
|
||
|
||
/**
|
||
* Scale all the coefficients of a by the scalar value.
|
||
*/
|
||
void sws_scaleVec(SwsVector *a, double scalar);
|
||
|
||
/**
|
||
* Scale all the coefficients of a so that their sum equals height.
|
||
*/
|
||
void sws_normalizeVec(SwsVector *a, double height);
|
||
|
||
#if FF_API_SWS_VECTOR
|
||
attribute_deprecated SwsVector *sws_getConstVec(double c, int length);
|
||
attribute_deprecated SwsVector *sws_getIdentityVec(void);
|
||
attribute_deprecated void sws_convVec(SwsVector *a, SwsVector *b);
|
||
attribute_deprecated void sws_addVec(SwsVector *a, SwsVector *b);
|
||
attribute_deprecated void sws_subVec(SwsVector *a, SwsVector *b);
|
||
attribute_deprecated void sws_shiftVec(SwsVector *a, int shift);
|
||
attribute_deprecated SwsVector *sws_cloneVec(SwsVector *a);
|
||
attribute_deprecated void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);
|
||
#endif
|
||
|
||
void sws_freeVec(SwsVector *a);
|
||
|
||
SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
|
||
float lumaSharpen, float chromaSharpen,
|
||
float chromaHShift, float chromaVShift,
|
||
int verbose);
|
||
void sws_freeFilter(SwsFilter *filter);
|
||
|
||
/**
|
||
* Check if context can be reused, otherwise reallocate a new one.
|
||
*
|
||
* If context is NULL, just calls sws_getContext() to get a new
|
||
* context. Otherwise, checks if the parameters are the ones already
|
||
* saved in context. If that is the case, returns the current
|
||
* context. Otherwise, frees context and gets a new context with
|
||
* the new parameters.
|
||
*
|
||
* Be warned that srcFilter and dstFilter are not checked, they
|
||
* are assumed to remain the same.
|
||
*/
|
||
struct SwsContext *sws_getCachedContext(struct SwsContext *context,
|
||
int srcW, int srcH, enum AVPixelFormat srcFormat,
|
||
int dstW, int dstH, enum AVPixelFormat dstFormat,
|
||
int flags, SwsFilter *srcFilter,
|
||
SwsFilter *dstFilter, const double *param);
|
||
|
||
/**
|
||
* Convert an 8-bit paletted frame into a frame with a color depth of 32 bits.
|
||
*
|
||
* The output frame will have the same packed format as the palette.
|
||
*
|
||
* @param src source frame buffer
|
||
* @param dst destination frame buffer
|
||
* @param num_pixels number of pixels to convert
|
||
* @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
|
||
*/
|
||
void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);
|
||
|
||
/**
|
||
* Convert an 8-bit paletted frame into a frame with a color depth of 24 bits.
|
||
*
|
||
* With the palette format "ABCD", the destination frame ends up with the format "ABC".
|
||
*
|
||
* @param src source frame buffer
|
||
* @param dst destination frame buffer
|
||
* @param num_pixels number of pixels to convert
|
||
* @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
|
||
*/
|
||
void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);
|
||
|
||
/**
|
||
* Get the AVClass for swsContext. It can be used in combination with
|
||
* AV_OPT_SEARCH_FAKE_OBJ for examining options.
|
||
*
|
||
* @see av_opt_find().
|
||
*/
|
||
const AVClass *sws_get_class(void);
|
||
|
||
/**
|
||
* @}
|
||
*/
|
||
|
||
#endif /* SWSCALE_SWSCALE_H */
|