Documentation
¶
Overview ¶
Use of this source code is governed by a MIT license that can be found in the LICENSE file. by Giorgis (habtom@giorgis.io)
libswscale library performs highly optimized image scaling and colorspace and pixel format conversion operations. Rescaling: is the process of changing the video size. Several rescaling options and algorithms are available. Pixel format conversion: is the process of converting the image format and colorspace of the image.
Index ¶
- func Sws_addVec(a, b *C.struct_SwsVector)
- func Sws_allocVec(l int) *C.struct_SwsVector
- func Sws_cloneVec(a *C.struct_SwsVector) *C.struct_SwsVector
- func Sws_convVec(a, b *C.struct_SwsVector)
- func Sws_convertPalette8ToPacked24(s, d *C.uint8_t, px int, p *C.uint8_t)
- func Sws_convertPalette8ToPacked32(s, d *C.uint8_t, px int, p *C.uint8_t)
- func Sws_freeContext(ctxt *SwsContext)
- func Sws_freeFilter(f *C.struct_SwsFilter)
- func Sws_freeVec(a *C.struct_SwsVector)
- func Sws_getCachedContext(ctxt *C.struct_SwsContext, sw, sh int, sf C.enum_AVPixelFormat, dw, dh int, ...) *C.struct_SwsContext
- func Sws_getCoefficients(c int) *C.int
- func Sws_getColorspaceDetails(ctxt *C.struct_SwsContext, it, sr, t, dr, b, c, s *int) int
- func Sws_getConstVec(c float64, l int) *C.struct_SwsVector
- func Sws_getDefaultFilter(lb, cb, ls, cs, chs, cvs float32, v int) *C.struct_SwsFilter
- func Sws_getGaussianVec(v, q float64) *C.struct_SwsVector
- func Sws_getIdentityVec() *C.struct_SwsVector
- func Sws_get_class() *C.struct_AVClass
- func Sws_init_context(ctxt *SwsContext, sf, df *SwsFilter) int
- func Sws_isSupportedEndiannessConversion(p AVPixelFormat) int
- func Sws_isSupportedInput(p AVPixelFormat) int
- func Sws_isSupportedOutput(p AVPixelFormat) int
- func Sws_normalizeVec(a *C.struct_SwsVector, h float64)
- func Sws_printVec2(a *C.struct_SwsVector, lctx *C.struct_AVClass, l int)
- func Sws_scale(ctxt *SwsContext, src *uint8, str int, y, h int, d *uint8, ds int) int
- func Sws_scaleVec(a *SwsVector, s float64)
- func Sws_setColorspaceDetails(ctxt *C.struct_SwsContext, it *int, sr int, t *int, dr, b, c, s int) int
- func Sws_shiftVec(a *C.struct_SwsVector, s int)
- func Sws_subVec(a, b *C.struct_SwsVector)
- func Swscale_configuration() string
- func Swscale_license() string
- func Swscale_version() uint
- type AVClass
- type AVPixelFormat
- type SwsContext
- type SwsFilter
- type SwsVector
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func Sws_addVec ¶
func Sws_addVec(a, b *C.struct_SwsVector)
void sws_addVec (SwsVector *a, SwsVector *b)
func Sws_allocVec ¶
func Sws_allocVec(l int) *C.struct_SwsVector
SwsVector * sws_allocVec (int length) Allocate and return an uninitialized vector with length coefficients.
func Sws_cloneVec ¶
func Sws_cloneVec(a *C.struct_SwsVector) *C.struct_SwsVector
SwsVector * sws_cloneVec (SwsVector *a) Allocate and return a clone of the vector a, that is a vector with the same coefficients as a.
func Sws_convVec ¶
func Sws_convVec(a, b *C.struct_SwsVector)
void sws_convVec (SwsVector *a, SwsVector *b)
func Sws_convertPalette8ToPacked24 ¶
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.
func Sws_convertPalette8ToPacked32 ¶
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.
func Sws_freeContext ¶
func Sws_freeContext(ctxt *SwsContext)
void sws_freeContext (struct SwsContext *swsContext) Free the swscaler context swsContext.
func Sws_freeFilter ¶
func Sws_freeFilter(f *C.struct_SwsFilter)
void sws_freeFilter (SwsFilter *filter)
func Sws_getCachedContext ¶
func Sws_getCachedContext(ctxt *C.struct_SwsContext, sw, sh int, sf C.enum_AVPixelFormat, dw, dh int, df C.enum_AVPixelFormat, f int, sfl, dfl *C.struct_SwsFilter, p *C.double) *C.struct_SwsContext
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) Check if context can be reused, otherwise reallocate a new one.
func Sws_getCoefficients ¶
const int * sws_getCoefficients (int colorspace) Return a pointer to yuv<->rgb coefficients for the given colorspace suitable for sws_setColorspaceDetails().
func Sws_getColorspaceDetails ¶
func Sws_getColorspaceDetails(ctxt *C.struct_SwsContext, it, sr, t, dr, b, c, s *int) int
int sws_getColorspaceDetails (struct SwsContext *c, int **inv_table, int *srcRange, int **table, int *dstRange, int *brightness, int *contrast, int *saturation)
func Sws_getConstVec ¶
func Sws_getConstVec(c float64, l int) *C.struct_SwsVector
SwsVector * sws_getConstVec (double c, int length) Allocate and return a vector with length coefficients, all with the same value c.
func Sws_getDefaultFilter ¶
func Sws_getDefaultFilter(lb, cb, ls, cs, chs, cvs float32, v int) *C.struct_SwsFilter
SwsFilter * sws_getDefaultFilter (float lumaGBlur, float chromaGBlur, float lumaSharpen, float chromaSharpen, float chromaHShift, float chromaVShift, int verbose)
func Sws_getGaussianVec ¶
func Sws_getGaussianVec(v, q float64) *C.struct_SwsVector
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.
func Sws_getIdentityVec ¶
func Sws_getIdentityVec() *C.struct_SwsVector
SwsVector * sws_getIdentityVec (void) Allocate and return a vector with just one coefficient, with value 1.0.
func Sws_get_class ¶
func Sws_get_class() *C.struct_AVClass
const AVClass * sws_get_class (void) Get the AVClass for swsContext.
func Sws_init_context ¶
func Sws_init_context(ctxt *SwsContext, sf, df *SwsFilter) int
int sws_init_context (struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter) Initialize the swscaler context sws_context.
func Sws_isSupportedEndiannessConversion ¶
func Sws_isSupportedEndiannessConversion(p AVPixelFormat) int
int sws_isSupportedEndiannessConversion (enum AVPixelFormat pix_fmt)
func Sws_isSupportedInput ¶
func Sws_isSupportedInput(p AVPixelFormat) int
int sws_isSupportedInput (enum AVPixelFormat pix_fmt) Return a positive value if pix_fmt is a supported input format, 0 otherwise.
func Sws_isSupportedOutput ¶
func Sws_isSupportedOutput(p AVPixelFormat) int
int sws_isSupportedOutput (enum AVPixelFormat pix_fmt) Return a positive value if pix_fmt is a supported output format, 0 otherwise.
func Sws_normalizeVec ¶
func Sws_normalizeVec(a *C.struct_SwsVector, h float64)
void sws_normalizeVec (SwsVector *a, double height) Scale all the coefficients of a so that their sum equals height.
func Sws_printVec2 ¶
func Sws_printVec2(a *C.struct_SwsVector, lctx *C.struct_AVClass, l int)
void sws_printVec2 (SwsVector *a, AVClass *log_ctx, int log_level) Print with av_log() a textual representation of the vector a if log_level <= av_log_level.
func Sws_scale ¶
//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[]) //Scale the image slice in srcSlice and put the resulting scaled slice in the image in dst.
func Sws_scaleVec ¶
void sws_scaleVec (SwsVector *a, double scalar) Scale all the coefficients of a by the scalar value.
func Sws_setColorspaceDetails ¶
func Sws_setColorspaceDetails(ctxt *C.struct_SwsContext, it *int, sr int, t *int, dr, b, c, s int) int
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)
func Sws_shiftVec ¶
func Sws_shiftVec(a *C.struct_SwsVector, s int)
void sws_shiftVec (SwsVector *a, int shift)
func Sws_subVec ¶
func Sws_subVec(a, b *C.struct_SwsVector)
void sws_subVec (SwsVector *a, SwsVector *b)
func Swscale_configuration ¶
func Swscale_configuration() string
const char * swscale_configuration (void) Return the libswscale build-time configuration.
func Swscale_license ¶
func Swscale_license() string
const char * swscale_license (void) Return the libswscale license.
func Swscale_version ¶
func Swscale_version() uint
unsigned swscale_version (void) Return the LIBSWSCALE_VERSION_INT constant.
Types ¶
type AVClass ¶
type AVClass C.struct_AVClass
type AVPixelFormat ¶
type AVPixelFormat C.enum_AVPixelFormat
type SwsContext ¶
type SwsContext C.struct_SwsContext
func Sws_alloc_context ¶
func Sws_alloc_context() *SwsContext
struct SwsContext * sws_alloc_context (void) Allocate an empty SwsContext.
func Sws_getContext ¶
func Sws_getContext(sw, sh int, sf AVPixelFormat, dw, dh int, df AVPixelFormat, f int, sfl, dfl *SwsFilter, p *int) *SwsContext
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) Allocate and return an SwsContext.
type SwsFilter ¶
type SwsFilter C.struct_SwsFilter
type SwsVector ¶
type SwsVector C.struct_SwsVector
Source Files