Data Structures

struct   SwsContext

  Main external API structure. More...

 

struct   SwsVector

 

struct   SwsFilter

 

Macros

#define  SWS_SRC_V_CHR_DROP_MASK   0x30000

 

#define  SWS_SRC_V_CHR_DROP_SHIFT   16

 

#define  SWS_PARAM_DEFAULT   123456

 

#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

 

Enumerations

enum   SwsDither {
  SWS_DITHER_NONE = 0, SWS_DITHER_AUTO, SWS_DITHER_BAYER, SWS_DITHER_ED,
  SWS_DITHER_A_DITHER, SWS_DITHER_X_DITHER, SWS_DITHER_NB
}

 

enum   SwsAlphaBlend { SWS_ALPHA_BLEND_NONE = 0, SWS_ALPHA_BLEND_UNIFORM, SWS_ALPHA_BLEND_CHECKERBOARD, SWS_ALPHA_BLEND_NB }

 

enum   SwsFlags {
  SWS_FAST_BILINEAR = 1 << 0, SWS_BILINEAR = 1 << 1, SWS_BICUBIC = 1 << 2, SWS_X = 1 << 3,
  SWS_POINT = 1 << 4, SWS_AREA = 1 << 5, SWS_BICUBLIN = 1 << 6, SWS_GAUSS = 1 << 7,
  SWS_SINC = 1 << 8, SWS_LANCZOS = 1 << 9, SWS_SPLINE = 1 << 10, SWS_STRICT = 1 << 11,
  SWS_PRINT_INFO = 1 << 12, SWS_FULL_CHR_H_INT = 1 << 13, SWS_FULL_CHR_H_INP = 1 << 14, SWS_ACCURATE_RND = 1 << 18,
  SWS_BITEXACT = 1 << 19, SWS_UNSTABLE = 1 << 20, SWS_DIRECT_BGR = 1 << 15, SWS_ERROR_DIFFUSION = 1 << 23
}

 

enum   SwsIntent {
  SWS_INTENT_PERCEPTUAL = 0, SWS_INTENT_RELATIVE_COLORIMETRIC = 1, SWS_INTENT_SATURATION = 2, SWS_INTENT_ABSOLUTE_COLORIMETRIC = 3,
  SWS_INTENT_NB
}

 

Functions

unsigned  swscale_version (void)

 

const char *  swscale_configuration (void)

  Return the libswscale build-time configuration. More...

 

const char *  swscale_license (void)

  Return the libswscale license. More...

 

const AVClass *  sws_get_class (void)

  Get the AVClass for SwsContext. More...

 

SwsContext *  sws_alloc_context (void)

  Allocate an empty SwsContext and set its fields to default values. More...

 

void  sws_free_context (SwsContext **ctx)

  Free the context and everything associated with it, and write NULL to the provided pointer. More...

 

int  sws_test_format (enum AVPixelFormat format, int output)

  Test if a given pixel format is supported. More...

 

int  sws_test_colorspace (enum AVColorSpace colorspace, int output)

  Test if a given color space is supported. More...

 

int  sws_test_primaries (enum AVColorPrimaries primaries, int output)

  Test if a given set of color primaries is supported. More...

 

int  sws_test_transfer (enum AVColorTransferCharacteristic trc, int output)

  Test if a given color transfer function is supported. More...

 

int  sws_test_frame (const AVFrame *frame, int output)

  Helper function to run all sws_test_* against a frame, as well as testing the basic frame properties for sanity. More...

 

int  sws_frame_setup (SwsContext *ctx, const AVFrame *dst, const AVFrame *src)

  Like sws_scale_frame, but without actually scaling. More...

 

int  sws_is_noop (const AVFrame *dst, const AVFrame *src)

  Check if a given conversion is a noop. More...

 

int  sws_scale_frame (SwsContext *c, AVFrame *dst, const AVFrame *src)

  Scale source data from src and write the output to dst. More...

 

const int *  sws_getCoefficients (int colorspace)

  Return a pointer to yuv<->rgb coefficients for the given colorspace suitable for sws_setColorspaceDetails(). More...

 

int  sws_isSupportedInput (enum AVPixelFormat pix_fmt)

  Return a positive value if pix_fmt is a supported input format, 0 otherwise. More...

 

int  sws_isSupportedOutput (enum AVPixelFormat pix_fmt)

  Return a positive value if pix_fmt is a supported output format, 0 otherwise. More...

 

int  sws_isSupportedEndiannessConversion (enum AVPixelFormat pix_fmt)

 

av_warn_unused_result int  sws_init_context (SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter)

  Initialize the swscaler context sws_context. More...

 

void  sws_freeContext (SwsContext *swsContext)

  Free the swscaler context swsContext. More...

 

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)

  Allocate and return an SwsContext. More...

 

int  sws_scale (SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[])

  Scale the image slice in srcSlice and put the resulting scaled slice in the image in dst. More...

 

int  sws_frame_start (SwsContext *c, AVFrame *dst, const AVFrame *src)

  Initialize the scaling process for a given pair of source/destination frames. More...

 

void  sws_frame_end (SwsContext *c)

  Finish the scaling process for a pair of source/destination frames previously submitted with sws_frame_start(). More...

 

int  sws_send_slice (SwsContext *c, unsigned int slice_start, unsigned int slice_height)

  Indicate that a horizontal slice of input data is available in the source frame previously provided to sws_frame_start(). More...

 

int  sws_receive_slice (SwsContext *c, unsigned int slice_start, unsigned int slice_height)

  Request a horizontal slice of the output data to be written into the frame previously provided to sws_frame_start(). More...

 

unsigned int  sws_receive_slice_alignment (const SwsContext *c)

  Get the alignment required for slices. More...

 

int  sws_setColorspaceDetails (SwsContext *c, const int inv_table[4], int srcRange, const int table[4], int dstRange, int brightness, int contrast, int saturation)

 

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

 

SwsVector *  sws_allocVec (int length)

  Allocate and return an uninitialized vector with length coefficients. More...

 

SwsVector *  sws_getGaussianVec (double variance, double quality)

  Return a normalized Gaussian curve used to filter stuff quality = 3 is high quality, lower is lower quality. More...

 

void  sws_scaleVec (SwsVector *a, double scalar)

  Scale all the coefficients of a by the scalar value. More...

 

void  sws_normalizeVec (SwsVector *a, double height)

  Scale all the coefficients of a so that their sum equals height. More...

 

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)

 

SwsContext *  sws_getCachedContext (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)

  Check if context can be reused, otherwise reallocate a new one. More...

 

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 32 bits. More...

 

void  sws_convertPalette8ToPacked24 (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. More...