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FFmpeg
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Color conversion and scaling library. More...
Files | |
| file | swscale.h |
Data Structures | |
| struct | SwsVector |
| struct | SwsFilter |
Macros | |
| #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 |
| #define | SWS_FULL_CHR_H_INT 0x2000 |
| #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 |
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 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) |
| struct SwsContext * | sws_alloc_context (void) |
| Allocate an empty SwsContext. More... | |
| av_warn_unused_result int | sws_init_context (struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter) |
| Initialize the swscaler context sws_context. More... | |
| void | sws_freeContext (struct SwsContext *swsContext) |
| Free the swscaler context swsContext. More... | |
| 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. More... | |
| 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. More... | |
| 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) |
| 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... | |
| attribute_deprecated SwsVector * | sws_getConstVec (double c, int length) |
| Allocate and return a vector with length coefficients, all with the same value c. More... | |
| attribute_deprecated SwsVector * | sws_getIdentityVec (void) |
| Allocate and return a vector with just one coefficient, with value 1.0. More... | |
| 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) |
| Print with av_log() a textual representation of the vector a if log_level <= av_log_level. 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) |
| 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. 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... | |
| const AVClass * | sws_get_class (void) |
| Get the AVClass for swsContext. More... | |
Color conversion and scaling library.
Return the LIBSWSCALE_VERSION_INT constant.
| #define SWS_BILINEAR 2 |
| const char* swscale_configuration | ( | void | ) |
| const char* swscale_license | ( | void | ) |
Return a pointer to yuv<->rgb coefficients for the given colorspace suitable for sws_setColorspaceDetails().
| colorspace | One of the SWS_CS_* macros. If invalid, SWS_CS_DEFAULT is used. |
Definition at line 63 of file yuv2rgb.c.
Referenced by parse_yuv_type().
| int sws_isSupportedInput | ( | enum AVPixelFormat | pix_fmt | ) |
Return a positive value if pix_fmt is a supported input format, 0 otherwise.
Definition at line 276 of file utils.c.
Referenced by sws_init_context().
| int sws_isSupportedOutput | ( | enum AVPixelFormat | pix_fmt | ) |
Return a positive value if pix_fmt is a supported output format, 0 otherwise.
Definition at line 282 of file utils.c.
Referenced by sws_init_context().
| int sws_isSupportedEndiannessConversion | ( | enum AVPixelFormat | pix_fmt | ) |
| [in] | pix_fmt | the pixel format |
Definition at line 288 of file utils.c.
Referenced by query_formats(), and sws_init_context().
| struct SwsContext* sws_alloc_context | ( | void | ) |
Allocate an empty SwsContext.
This must be filled and passed to sws_init_context(). For filling see AVOptions, options.c and sws_setColorspaceDetails().
Definition at line 1084 of file utils.c.
Referenced by check_hscale(), config_props(), opt_default(), output_single_frame(), sws_alloc_set_opts(), and sws_getCachedContext().
| av_warn_unused_result int sws_init_context | ( | struct SwsContext * | sws_context, |
| SwsFilter * | srcFilter, | ||
| SwsFilter * | dstFilter | ||
| ) |
Initialize the swscaler context sws_context.
Definition at line 1170 of file utils.c.
Referenced by check_hscale(), config_props(), output_single_frame(), sws_getCachedContext(), sws_getContext(), and sws_setColorspaceDetails().
| void sws_freeContext | ( | struct SwsContext * | swsContext | ) |
Free the swscaler context swsContext.
If swsContext is NULL, then does nothing.
Definition at line 2319 of file utils.c.
Referenced by check_hscale(), close_filter_param(), close_stream(), config_props(), doTest(), ff_scale_image(), main(), opt_default(), output_single_frame(), stream_close(), sws_getCachedContext(), sws_getContext(), sws_init_context(), and uninit().
| 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.
You need it to perform scaling/conversion operations using sws_scale().
| srcW | the width of the source image |
| srcH | the height of the source image |
| srcFormat | the source image format |
| dstW | the width of the destination image |
| dstH | the height of the destination image |
| dstFormat | the destination image format |
| flags | specify which algorithm and options to use for rescaling |
| 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 |
Definition at line 1899 of file utils.c.
Referenced by config_props(), doTest(), ff_scale_image(), get_video_frame(), main(), open_filter_param(), prepare_sws_context(), sws_init_context(), and sws_setColorspaceDetails().
| 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.
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.
| c | the scaling context previously created with sws_getContext() |
| srcSlice | the array containing the pointers to the planes of the source slice |
| srcStride | the array containing the strides for each plane of the source image |
| 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 |
| srcSliceH | the height of the source slice, that is the number of rows in the slice |
| dst | the array containing the pointers to the planes of the destination image |
| dstStride | the array containing the strides for each plane of the destination image |
Scale the image slice in srcSlice and put the resulting scaled slice in the image in dst.
Assumes planar YUV to be in YUV order instead of YVU.
Definition at line 744 of file swscale.c.
Referenced by blur(), copy_from_dnn_to_frame(), copy_from_frame_to_dnn(), copy_uv_planes(), doTest(), ff_scale_image(), filter_frame(), get_video_frame(), main(), output_single_frame(), scale_slice(), sws_scale(), upload_texture(), video_image_display(), and wrap().
| 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 | ||
| ) |
| dstRange | flag indicating the while-black range of the output (1=jpeg / 0=mpeg) |
| srcRange | flag indicating the while-black range of the input (1=jpeg / 0=mpeg) |
| table | the yuv2rgb coefficients describing the output yuv space, normally ff_yuv2rgb_coeffs[x] |
| inv_table | the yuv2rgb coefficients describing the input yuv space, normally ff_yuv2rgb_coeffs[x] |
| brightness | 16.16 fixed point brightness correction |
| contrast | 16.16 fixed point contrast correction |
| saturation | 16.16 fixed point saturation correction |
Definition at line 863 of file utils.c.
Referenced by scale_frame(), and sws_init_context().
Allocate and return an uninitialized vector with length coefficients.
Definition at line 2019 of file utils.c.
Referenced by sws_cloneVec(), sws_getConstVec(), and sws_getGaussianVec().
| 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.
Definition at line 2036 of file utils.c.
Referenced by alloc_sws_context(), open_filter_param(), and sws_getDefaultFilter().
| void sws_scaleVec | ( | SwsVector * | a, |
| double | scalar | ||
| ) |
Scale all the coefficients of a by the scalar value.
Definition at line 2106 of file utils.c.
Referenced by alloc_sws_context(), sws_getDefaultFilter(), and sws_normalizeVec().
| void sws_normalizeVec | ( | SwsVector * | a, |
| double | height | ||
| ) |
Scale all the coefficients of a so that their sum equals height.
Definition at line 2114 of file utils.c.
Referenced by sws_getDefaultFilter(), and sws_getGaussianVec().
| attribute_deprecated SwsVector* sws_getConstVec | ( | double | c, |
| int | length | ||
| ) |
Allocate and return a vector with length coefficients, all with the same value c.
Definition at line 2069 of file utils.c.
Referenced by sws_diffVec(), sws_getConvVec(), sws_getIdentityVec(), sws_getShiftedVec(), and sws_sumVec().
| attribute_deprecated SwsVector* sws_getIdentityVec | ( | void | ) |
Allocate and return a vector with just one coefficient, with value 1.0.
Definition at line 2090 of file utils.c.
Referenced by sws_getDefaultFilter().
| attribute_deprecated void sws_convVec | ( | SwsVector * | a, |
| SwsVector * | b | ||
| ) |
| attribute_deprecated void sws_addVec | ( | SwsVector * | a, |
| SwsVector * | b | ||
| ) |
Definition at line 2212 of file utils.c.
Referenced by sws_getDefaultFilter().
| attribute_deprecated void sws_subVec | ( | SwsVector * | a, |
| SwsVector * | b | ||
| ) |
| attribute_deprecated void sws_shiftVec | ( | SwsVector * | a, |
| int | shift | ||
| ) |
Definition at line 2196 of file utils.c.
Referenced by sws_getDefaultFilter().
| attribute_deprecated SwsVector* sws_cloneVec | ( | SwsVector * | a | ) |
| attribute_deprecated 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.
Definition at line 2272 of file utils.c.
Referenced by sws_getDefaultFilter().
| void sws_freeVec | ( | SwsVector * | a | ) |
Definition at line 2298 of file utils.c.
Referenced by alloc_sws_context(), open_filter_param(), sws_freeFilter(), and sws_getDefaultFilter().
| 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.
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.
Definition at line 2379 of file utils.c.
Referenced by alloc_sws_context(), upload_texture(), and video_image_display().
| 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.
The output frame will have the same packed format as the palette.
| src | source frame buffer |
| dst | destination frame buffer |
| num_pixels | number of pixels to convert |
| palette | array with [256] entries, which must match color arrangement (RGB or BGR) of src |
Definition at line 2182 of file swscale_unscaled.c.
Referenced by palToRgbWrapper().
| 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.
With the palette format "ABCD", the destination frame ends up with the format "ABC".
| src | source frame buffer |
| dst | destination frame buffer |
| num_pixels | number of pixels to convert |
| palette | array with [256] entries, which must match color arrangement (RGB or BGR) of src |
Definition at line 2192 of file swscale_unscaled.c.
Referenced by palToRgbWrapper().
| const AVClass* sws_get_class | ( | void | ) |
Get the AVClass for swsContext.
It can be used in combination with AV_OPT_SEARCH_FAKE_OBJ for examining options.
Definition at line 95 of file options.c.
Referenced by child_class_next(), init_dict(), opt_default(), and show_help_default().
1.8.17