libswscale/swscale.h

Go to the documentation of this file.

/*
 * 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

#include "libavutil/avutil.h"
#include "libavutil/log.h"
#include "libavutil/pixfmt.h"

#define LIBSWSCALE_VERSION_MAJOR 2
#define LIBSWSCALE_VERSION_MINOR 1
#define LIBSWSCALE_VERSION_MICRO 0

#define LIBSWSCALE_VERSION_INT  AV_VERSION_INT(LIBSWSCALE_VERSION_MAJOR, \
                                               LIBSWSCALE_VERSION_MINOR, \
                                               LIBSWSCALE_VERSION_MICRO)
#define LIBSWSCALE_VERSION      AV_VERSION(LIBSWSCALE_VERSION_MAJOR, \
                                           LIBSWSCALE_VERSION_MINOR, \
                                           LIBSWSCALE_VERSION_MICRO)
#define LIBSWSCALE_BUILD        LIBSWSCALE_VERSION_INT

#define LIBSWSCALE_IDENT        "SwS" AV_STRINGIFY(LIBSWSCALE_VERSION)

#ifndef FF_API_SWS_GETCONTEXT
#define FF_API_SWS_GETCONTEXT  (LIBSWSCALE_VERSION_MAJOR < 3)
#endif
#ifndef FF_API_SWS_CPU_CAPS
#define FF_API_SWS_CPU_CAPS    (LIBSWSCALE_VERSION_MAJOR < 3)
#endif
#ifndef FF_API_SWS_FORMAT_NAME
#define FF_API_SWS_FORMAT_NAME  (LIBSWSCALE_VERSION_MAJOR < 3)
#endif

unsigned swscale_version(void);

const char *swscale_configuration(void);

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 chrominace 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

#if FF_API_SWS_CPU_CAPS

#define SWS_CPU_CAPS_MMX      0x80000000
#define SWS_CPU_CAPS_MMX2     0x20000000
#define SWS_CPU_CAPS_3DNOW    0x40000000
#define SWS_CPU_CAPS_ALTIVEC  0x10000000
#define SWS_CPU_CAPS_BFIN     0x01000000
#define SWS_CPU_CAPS_SSE2     0x02000000
#endif

#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

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 {
    double *coeff;              
    int length;                 
} SwsVector;

// vectors can be shared
typedef struct {
    SwsVector *lumH;
    SwsVector *lumV;
    SwsVector *chrH;
    SwsVector *chrV;
} SwsFilter;

struct SwsContext;

int sws_isSupportedInput(enum PixelFormat pix_fmt);

int sws_isSupportedOutput(enum PixelFormat pix_fmt);

struct SwsContext *sws_alloc_context(void);

int sws_init_context(struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter);

void sws_freeContext(struct SwsContext *swsContext);

#if FF_API_SWS_GETCONTEXT

struct SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat,
                                  int dstW, int dstH, enum PixelFormat dstFormat,
                                  int flags, SwsFilter *srcFilter,
                                  SwsFilter *dstFilter, const double *param);
#endif

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[]);

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);

int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
                             int *srcRange, int **table, int *dstRange,
                             int *brightness, int *contrast, int *saturation);

SwsVector *sws_allocVec(int length);

SwsVector *sws_getGaussianVec(double variance, double quality);

SwsVector *sws_getConstVec(double c, int length);

SwsVector *sws_getIdentityVec(void);

void sws_scaleVec(SwsVector *a, double scalar);

void sws_normalizeVec(SwsVector *a, double height);
void sws_convVec(SwsVector *a, SwsVector *b);
void sws_addVec(SwsVector *a, SwsVector *b);
void sws_subVec(SwsVector *a, SwsVector *b);
void sws_shiftVec(SwsVector *a, int shift);

SwsVector *sws_cloneVec(SwsVector *a);

void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level);

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);

struct SwsContext *sws_getCachedContext(struct SwsContext *context,
                                        int srcW, int srcH, enum PixelFormat srcFormat,
                                        int dstW, int dstH, enum PixelFormat dstFormat,
                                        int flags, SwsFilter *srcFilter,
                                        SwsFilter *dstFilter, const double *param);

void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);

void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);

const AVClass *sws_get_class(void);

#endif /* SWSCALE_SWSCALE_H */

---