1/*
2 * Copyright (C) 2024 Niklas Haas
3 * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#ifndef SWSCALE_SWSCALE_H
23#define SWSCALE_SWSCALE_H
24
25/**
26 * @file
27 * @ingroup libsws
28 * external API header
29 */
30
31#include <stdint.h>
32
33#include "libavutil/avutil.h"
34#include "libavutil/frame.h"
35#include "libavutil/log.h"
36#include "libavutil/pixfmt.h"
37#include "version_major.h"
38#ifndef HAVE_AV_CONFIG_H
39/* When included as part of the ffmpeg build, only include the major version
40 * to avoid unnecessary rebuilds. When included externally, keep including
41 * the full version information. */
42#include "version.h"
43#endif
44
45/**
46 * @defgroup libsws libswscale
47 * Color conversion and scaling library.
48 *
49 * @{
50 *
51 * Return the LIBSWSCALE_VERSION_INT constant.
52 */
53unsigned swscale_version(void);
54
55/**
56 * Return the libswscale build-time configuration.
57 */
58const char *swscale_configuration(void);
59
60/**
61 * Return the libswscale license.
62 */
63const char *swscale_license(void);
64
65/**
66 * Get the AVClass for SwsContext. It can be used in combination with
67 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
68 *
69 * @see av_opt_find().
70 */
71const AVClass *sws_get_class(void);
72
73/******************************
74 * Flags and quality settings *
75 ******************************/
76
77typedef enum SwsDither {
78 SWS_DITHER_NONE = 0, /* disable dithering */
79 SWS_DITHER_AUTO, /* auto-select from preset */
80 SWS_DITHER_BAYER, /* ordered dither matrix */
81 SWS_DITHER_ED, /* error diffusion */
82 SWS_DITHER_A_DITHER, /* arithmetic addition */
83 SWS_DITHER_X_DITHER, /* arithmetic xor */
84 SWS_DITHER_NB, /* not part of the ABI */
85 SWS_DITHER_MAX_ENUM = 0x7FFFFFFF, /* force size to 32 bits, not a valid dither type */
86} SwsDither;
87
88typedef enum SwsAlphaBlend {
89 SWS_ALPHA_BLEND_NONE = 0,
90 SWS_ALPHA_BLEND_UNIFORM,
91 SWS_ALPHA_BLEND_CHECKERBOARD,
92 SWS_ALPHA_BLEND_NB, /* not part of the ABI */
93 SWS_ALPHA_BLEND_MAX_ENUM = 0x7FFFFFFF, /* force size to 32 bits, not a valid blend mode */
94} SwsAlphaBlend;
95
96typedef enum SwsFlags {
97 /**
98 * Scaler selection options. Only one may be active at a time.
99 */
100 SWS_FAST_BILINEAR = 1 << 0, ///< fast bilinear filtering
101 SWS_BILINEAR = 1 << 1, ///< bilinear filtering
102 SWS_BICUBIC = 1 << 2, ///< 2-tap cubic B-spline
103 SWS_X = 1 << 3, ///< experimental
104 SWS_POINT = 1 << 4, ///< nearest neighbor
105 SWS_AREA = 1 << 5, ///< area averaging
106 SWS_BICUBLIN = 1 << 6, ///< bicubic luma, bilinear chroma
107 SWS_GAUSS = 1 << 7, ///< gaussian approximation
108 SWS_SINC = 1 << 8, ///< unwindowed sinc
109 SWS_LANCZOS = 1 << 9, ///< 3-tap sinc/sinc
110 SWS_SPLINE = 1 << 10, ///< cubic Keys spline
111
112 /**
113 * Return an error on underspecified conversions. Without this flag,
114 * unspecified fields are defaulted to sensible values.
115 */
116 SWS_STRICT = 1 << 11,
117
118 /**
119 * Emit verbose log of scaling parameters.
120 */
121 SWS_PRINT_INFO = 1 << 12,
122
123 /**
124 * Perform full chroma upsampling when upscaling to RGB.
125 *
126 * For example, when converting 50x50 yuv420p to 100x100 rgba, setting this flag
127 * will scale the chroma plane from 25x25 to 100x100 (4:4:4), and then convert
128 * the 100x100 yuv444p image to rgba in the final output step.
129 *
130 * Without this flag, the chroma plane is instead scaled to 50x100 (4:2:2),
131 * with a single chroma sample being reused for both of the horizontally
132 * adjacent RGBA output pixels.
133 */
134 SWS_FULL_CHR_H_INT = 1 << 13,
135
136 /**
137 * Perform full chroma interpolation when downscaling RGB sources.
138 *
139 * For example, when converting a 100x100 rgba source to 50x50 yuv444p, setting
140 * this flag will generate a 100x100 (4:4:4) chroma plane, which is then
141 * downscaled to the required 50x50.
142 *
143 * Without this flag, the chroma plane is instead generated at 50x100 (dropping
144 * every other pixel), before then being downscaled to the required 50x50
145 * resolution.
146 */
147 SWS_FULL_CHR_H_INP = 1 << 14,
148
149 /**
150 * Force bit-exact output. This will prevent the use of platform-specific
151 * optimizations that may lead to slight difference in rounding, in favor
152 * of always maintaining exact bit output compatibility with the reference
153 * C code.
154 *
155 * Note: It is recommended to set both of these flags simultaneously.
156 */
157 SWS_ACCURATE_RND = 1 << 18,
158 SWS_BITEXACT = 1 << 19,
159
160 /**
161 * Allow using experimental new code paths. This may be faster, slower,
162 * or produce different output, with semantics subject to change at any
163 * point in time. For testing and debugging purposes only.
164 */
165 SWS_UNSTABLE = 1 << 20,
166
167 /**
168 * Deprecated flags.
169 */
170 SWS_DIRECT_BGR = 1 << 15, ///< This flag has no effect
171 SWS_ERROR_DIFFUSION = 1 << 23, ///< Set `SwsContext.dither` instead
172} SwsFlags;
173
174typedef enum SwsIntent {
175 SWS_INTENT_PERCEPTUAL = 0, ///< Perceptual tone mapping
176 SWS_INTENT_RELATIVE_COLORIMETRIC = 1, ///< Relative colorimetric clipping
177 SWS_INTENT_SATURATION = 2, ///< Saturation mapping
178 SWS_INTENT_ABSOLUTE_COLORIMETRIC = 3, ///< Absolute colorimetric clipping
179 SWS_INTENT_NB, ///< not part of the ABI
180} SwsIntent;
181
182/***********************************
183 * Context creation and management *
184 ***********************************/
185
186/**
187 * Main external API structure. New fields can be added to the end with
188 * minor version bumps. Removal, reordering and changes to existing fields
189 * require a major version bump. sizeof(SwsContext) is not part of the ABI.
190 */
191typedef struct SwsContext {
192 const AVClass *av_class;
193
194 /**
195 * Private data of the user, can be used to carry app specific stuff.
196 */
197 void *opaque;
198
199 /**
200 * Bitmask of SWS_*. See `SwsFlags` for details.
201 */
202 unsigned flags;
203
204 /**
205 * Extra parameters for fine-tuning certain scalers.
206 */
207 double scaler_params[2];
208
209 /**
210 * How many threads to use for processing, or 0 for automatic selection.
211 */
212 int threads;
213
214 /**
215 * Dither mode.
216 */
217 SwsDither dither;
218
219 /**
220 * Alpha blending mode. See `SwsAlphaBlend` for details.
221 */
222 SwsAlphaBlend alpha_blend;
223
224 /**
225 * Use gamma correct scaling.
226 */
227 int gamma_flag;
228
229 /**
230 * Deprecated frame property overrides, for the legacy API only.
231 *
232 * Ignored by sws_scale_frame() when used in dynamic mode, in which
233 * case all properties are instead taken from the frame directly.
234 */
235 int src_w, src_h; ///< Width and height of the source frame
236 int dst_w, dst_h; ///< Width and height of the destination frame
237 int src_format; ///< Source pixel format
238 int dst_format; ///< Destination pixel format
239 int src_range; ///< Source is full range
240 int dst_range; ///< Destination is full range
241 int src_v_chr_pos; ///< Source vertical chroma position in luma grid / 256
242 int src_h_chr_pos; ///< Source horizontal chroma position
243 int dst_v_chr_pos; ///< Destination vertical chroma position
244 int dst_h_chr_pos; ///< Destination horizontal chroma position
245
246 /**
247 * Desired ICC intent for color space conversions.
248 */
249 int intent;
250
251 /* Remember to add new fields to graph.c:opts_equal() */
252} SwsContext;
253
254/**
255 * Allocate an empty SwsContext and set its fields to default values.
256 */
257SwsContext *sws_alloc_context(void);
258
259/**
260 * Free the context and everything associated with it, and write NULL
261 * to the provided pointer.
262 */
263void sws_free_context(SwsContext **ctx);
264
265/***************************
266 * Supported frame formats *
267 ***************************/
268
269/**
270 * Test if a given (software) pixel format is supported.
271 *
272 * @param output If 0, test if compatible with the source/input frame;
273 * otherwise, with the destination/output frame.
274 * @param format The format to check.
275 *
276 * @return A positive integer if supported, 0 otherwise.
277 */
278int sws_test_format(enum AVPixelFormat format, int output);
279
280/**
281 * Test if a given hardware pixel format is supported.
282 *
283 * @param format The hardware format to check, or AV_PIX_FMT_NONE.
284 *
285 * @return A positive integer if supported or AV_PIX_FMT_NONE, 0 otherwise.
286 */
287int sws_test_hw_format(enum AVPixelFormat format);
288
289/**
290 * Test if a given color space is supported.
291 *
292 * @param output If 0, test if compatible with the source/input frame;
293 * otherwise, with the destination/output frame.
294 * @param colorspace The colorspace to check.
295 *
296 * @return A positive integer if supported, 0 otherwise.
297 */
298int sws_test_colorspace(enum AVColorSpace colorspace, int output);
299
300/**
301 * Test if a given set of color primaries is supported.
302 *
303 * @param output If 0, test if compatible with the source/input frame;
304 * otherwise, with the destination/output frame.
305 * @param primaries The color primaries to check.
306 *
307 * @return A positive integer if supported, 0 otherwise.
308 */
309int sws_test_primaries(enum AVColorPrimaries primaries, int output);
310
311/**
312 * Test if a given color transfer function is supported.
313 *
314 * @param output If 0, test if compatible with the source/input frame;
315 * otherwise, with the destination/output frame.
316 * @param trc The color transfer function to check.
317 *
318 * @return A positive integer if supported, 0 otherwise.
319 */
320int sws_test_transfer(enum AVColorTransferCharacteristic trc, int output);
321
322/**
323 * Helper function to run all sws_test_* against a frame, as well as testing
324 * the basic frame properties for sanity. Ignores irrelevant properties - for
325 * example, AVColorSpace is not checked for RGB frames.
326 */
327int sws_test_frame(const AVFrame *frame, int output);
328
329/**
330 * Like `sws_scale_frame`, but without actually scaling. It will instead
331 * merely initialize internal state that *would* be required to perform the
332 * operation, as well as returning the correct error code for unsupported
333 * frame combinations.
334 *
335 * @param ctx The scaling context.
336 * @param dst The destination frame to consider.
337 * @param src The source frame to consider.
338 * @return 0 on success, a negative AVERROR code on failure.
339 */
340int sws_frame_setup(SwsContext *ctx, const AVFrame *dst, const AVFrame *src);
341
342/********************
343 * Main scaling API *
344 ********************/
345
346/**
347 * Check if a given conversion is a noop. Returns a positive integer if
348 * no operation needs to be performed, 0 otherwise.
349 */
350int sws_is_noop(const AVFrame *dst, const AVFrame *src);
351
352/**
353 * Scale source data from `src` and write the output to `dst`.
354 *
355 * This function can be used directly on an allocated context, without setting
356 * up any frame properties or calling `sws_init_context()`. Such usage is fully
357 * dynamic and does not require reallocation if the frame properties change.
358 *
359 * Alternatively, this function can be called on a context that has been
360 * explicitly initialized. However, this is provided only for backwards
361 * compatibility. In this usage mode, all frame properties must be correctly
362 * set at init time, and may no longer change after initialization.
363 *
364 * @param ctx The scaling context.
365 * @param dst The destination frame. The data buffers may either be already
366 * allocated by the caller or left clear, in which case they will
367 * be allocated by the scaler. The latter may have performance
368 * advantages - e.g. in certain cases some (or all) output planes
369 * may be references to input planes, rather than copies.
370 * @param src The source frame. If the data buffers are set to NULL, then
371 * this function behaves identically to `sws_frame_setup`.
372 * @return >= 0 on success, a negative AVERROR code on failure.
373 */
374int sws_scale_frame(SwsContext *c, AVFrame *dst, const AVFrame *src);
375
376/*************************
377 * Legacy (stateful) API *
378 *************************/
379
380#define SWS_SRC_V_CHR_DROP_MASK 0x30000
381#define SWS_SRC_V_CHR_DROP_SHIFT 16
382
383#define SWS_PARAM_DEFAULT 123456
384
385#define SWS_MAX_REDUCE_CUTOFF 0.002
386
387#define SWS_CS_ITU709 1
388#define SWS_CS_FCC 4
389#define SWS_CS_ITU601 5
390#define SWS_CS_ITU624 5
391#define SWS_CS_SMPTE170M 5
392#define SWS_CS_SMPTE240M 7
393#define SWS_CS_DEFAULT 5
394#define SWS_CS_BT2020 9
395
396/**
397 * Return a pointer to yuv<->rgb coefficients for the given colorspace
398 * suitable for sws_setColorspaceDetails().
399 *
400 * @param colorspace One of the SWS_CS_* macros. If invalid,
401 * SWS_CS_DEFAULT is used.
402 */
403const int *sws_getCoefficients(int colorspace);
404
405// when used for filters they must have an odd number of elements
406// coeffs cannot be shared between vectors
407typedef struct SwsVector {
408 double *coeff; ///< pointer to the list of coefficients
409 int length; ///< number of coefficients in the vector
410} SwsVector;
411
412// vectors can be shared
413typedef struct SwsFilter {
414 SwsVector *lumH;
415 SwsVector *lumV;
416 SwsVector *chrH;
417 SwsVector *chrV;
418} SwsFilter;
419
420/**
421 * Return a positive value if pix_fmt is a supported input format, 0
422 * otherwise.
423 */
424int sws_isSupportedInput(enum AVPixelFormat pix_fmt);
425
426/**
427 * Return a positive value if pix_fmt is a supported output format, 0
428 * otherwise.
429 */
430int sws_isSupportedOutput(enum AVPixelFormat pix_fmt);
431
432/**
433 * @param[in] pix_fmt the pixel format
434 * @return a positive value if an endianness conversion for pix_fmt is
435 * supported, 0 otherwise.
436 */
437int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt);
438
439/**
440 * Initialize the swscaler context sws_context.
441 *
442 * This function is considered deprecated, and provided only for backwards
443 * compatibility with sws_scale() and sws_frame_start(). The preferred way to
444 * use libswscale is to set all frame properties correctly and call
445 * sws_scale_frame() directly, without explicitly initializing the context.
446 *
447 * @return zero or positive value on success, a negative value on
448 * error
449 */
450av_warn_unused_result
451int sws_init_context(SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter);
452
453/**
454 * Free the swscaler context swsContext.
455 * If swsContext is NULL, then does nothing.
456 */
457void sws_freeContext(SwsContext *swsContext);
458
459/**
460 * Allocate and return an SwsContext. You need it to perform
461 * scaling/conversion operations using sws_scale().
462 *
463 * @param srcW the width of the source image
464 * @param srcH the height of the source image
465 * @param srcFormat the source image format
466 * @param dstW the width of the destination image
467 * @param dstH the height of the destination image
468 * @param dstFormat the destination image format
469 * @param flags specify which algorithm and options to use for rescaling
470 * @param param extra parameters to tune the used scaler
471 * For SWS_BICUBIC param[0] and [1] tune the shape of the basis
472 * function, param[0] tunes f(1) and param[1] f´(1)
473 * For SWS_GAUSS param[0] tunes the exponent and thus cutoff
474 * frequency
475 * For SWS_LANCZOS param[0] tunes the width of the window function
476 * @return a pointer to an allocated context, or NULL in case of error
477 * @note this function is to be removed after a saner alternative is
478 * written
479 */
480SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,
481 int dstW, int dstH, enum AVPixelFormat dstFormat,
482 int flags, SwsFilter *srcFilter,
483 SwsFilter *dstFilter, const double *param);
484
485/**
486 * Scale the image slice in srcSlice and put the resulting scaled
487 * slice in the image in dst. A slice is a sequence of consecutive
488 * rows in an image. Requires a context that has previously been
489 * initialized with sws_init_context().
490 *
491 * Slices have to be provided in sequential order, either in
492 * top-bottom or bottom-top order. If slices are provided in
493 * non-sequential order the behavior of the function is undefined.
494 *
495 * @param c the scaling context previously created with
496 * sws_getContext()
497 * @param srcSlice the array containing the pointers to the planes of
498 * the source slice
499 * @param srcStride the array containing the strides for each plane of
500 * the source image
501 * @param srcSliceY the position in the source image of the slice to
502 * process, that is the number (counted starting from
503 * zero) in the image of the first row of the slice
504 * @param srcSliceH the height of the source slice, that is the number
505 * of rows in the slice
506 * @param dst the array containing the pointers to the planes of
507 * the destination image
508 * @param dstStride the array containing the strides for each plane of
509 * the destination image
510 * @return the height of the output slice
511 */
512int sws_scale(SwsContext *c, const uint8_t *const srcSlice[],
513 const int srcStride[], int srcSliceY, int srcSliceH,
514 uint8_t *const dst[], const int dstStride[]);
515
516/**
517 * Initialize the scaling process for a given pair of source/destination frames.
518 * Must be called before any calls to sws_send_slice() and sws_receive_slice().
519 * Requires a context that has previously been initialized with sws_init_context().
520 *
521 * This function will retain references to src and dst, so they must both use
522 * refcounted buffers (if allocated by the caller, in case of dst).
523 *
524 * @param c The scaling context
525 * @param dst The destination frame.
526 *
527 * The data buffers may either be already allocated by the caller or
528 * left clear, in which case they will be allocated by the scaler.
529 * The latter may have performance advantages - e.g. in certain cases
530 * some output planes may be references to input planes, rather than
531 * copies.
532 *
533 * Output data will be written into this frame in successful
534 * sws_receive_slice() calls.
535 * @param src The source frame. The data buffers must be allocated, but the
536 * frame data does not have to be ready at this point. Data
537 * availability is then signalled by sws_send_slice().
538 * @return 0 on success, a negative AVERROR code on failure
539 *
540 * @see sws_frame_end()
541 */
542int sws_frame_start(SwsContext *c, AVFrame *dst, const AVFrame *src);
543
544/**
545 * Finish the scaling process for a pair of source/destination frames previously
546 * submitted with sws_frame_start(). Must be called after all sws_send_slice()
547 * and sws_receive_slice() calls are done, before any new sws_frame_start()
548 * calls.
549 *
550 * @param c The scaling context
551 */
552void sws_frame_end(SwsContext *c);
553
554/**
555 * Indicate that a horizontal slice of input data is available in the source
556 * frame previously provided to sws_frame_start(). The slices may be provided in
557 * any order, but may not overlap. For vertically subsampled pixel formats, the
558 * slices must be aligned according to subsampling.
559 *
560 * @param c The scaling context
561 * @param slice_start first row of the slice
562 * @param slice_height number of rows in the slice
563 *
564 * @return a non-negative number on success, a negative AVERROR code on failure.
565 */
566int sws_send_slice(SwsContext *c, unsigned int slice_start,
567 unsigned int slice_height);
568
569/**
570 * Request a horizontal slice of the output data to be written into the frame
571 * previously provided to sws_frame_start().
572 *
573 * @param c The scaling context
574 * @param slice_start first row of the slice; must be a multiple of
575 * sws_receive_slice_alignment()
576 * @param slice_height number of rows in the slice; must be a multiple of
577 * sws_receive_slice_alignment(), except for the last slice
578 * (i.e. when slice_start+slice_height is equal to output
579 * frame height)
580 *
581 * @return a non-negative number if the data was successfully written into the output
582 * AVERROR(EAGAIN) if more input data needs to be provided before the
583 * output can be produced
584 * another negative AVERROR code on other kinds of scaling failure
585 */
586int sws_receive_slice(SwsContext *c, unsigned int slice_start,
587 unsigned int slice_height);
588
589/**
590 * Get the alignment required for slices. Requires a context that has
591 * previously been initialized with sws_init_context().
592 *
593 * @param c The scaling context
594 * @return alignment required for output slices requested with sws_receive_slice().
595 * Slice offsets and sizes passed to sws_receive_slice() must be
596 * multiples of the value returned from this function.
597 */
598unsigned int sws_receive_slice_alignment(const SwsContext *c);
599
600/**
601 * @param c the scaling context
602 * @param dstRange flag indicating the white-black range of the output (1=jpeg / 0=mpeg)
603 * @param srcRange flag indicating the white-black range of the input (1=jpeg / 0=mpeg)
604 * @param table the yuv2rgb coefficients describing the output yuv space, normally ff_yuv2rgb_coeffs[x]
605 * @param inv_table the yuv2rgb coefficients describing the input yuv space, normally ff_yuv2rgb_coeffs[x]
606 * @param brightness 16.16 fixed point brightness correction
607 * @param contrast 16.16 fixed point contrast correction
608 * @param saturation 16.16 fixed point saturation correction
609 *
610 * @return A negative error code on error, non negative otherwise.
611 * If `LIBSWSCALE_VERSION_MAJOR < 7`, returns -1 if not supported.
612 */
613int sws_setColorspaceDetails(SwsContext *c, const int inv_table[4],
614 int srcRange, const int table[4], int dstRange,
615 int brightness, int contrast, int saturation);
616
617/**
618 * @return A negative error code on error, non negative otherwise.
619 * If `LIBSWSCALE_VERSION_MAJOR < 7`, returns -1 if not supported.
620 */
621int sws_getColorspaceDetails(SwsContext *c, int **inv_table,
622 int *srcRange, int **table, int *dstRange,
623 int *brightness, int *contrast, int *saturation);
624
625/**
626 * Allocate and return an uninitialized vector with length coefficients.
627 */
628SwsVector *sws_allocVec(int length);
629
630/**
631 * Return a normalized Gaussian curve used to filter stuff
632 * quality = 3 is high quality, lower is lower quality.
633 */
634SwsVector *sws_getGaussianVec(double variance, double quality);
635
636/**
637 * Scale all the coefficients of a by the scalar value.
638 */
639void sws_scaleVec(SwsVector *a, double scalar);
640
641/**
642 * Scale all the coefficients of a so that their sum equals height.
643 */
644void sws_normalizeVec(SwsVector *a, double height);
645
646void sws_freeVec(SwsVector *a);
647
648SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
649 float lumaSharpen, float chromaSharpen,
650 float chromaHShift, float chromaVShift,
651 int verbose);
652void sws_freeFilter(SwsFilter *filter);
653
654/**
655 * Check if context can be reused, otherwise reallocate a new one.
656 *
657 * If context is NULL, just calls sws_getContext() to get a new
658 * context. Otherwise, checks if the parameters are the ones already
659 * saved in context. If that is the case, returns the current
660 * context. Otherwise, frees context and gets a new context with
661 * the new parameters.
662 *
663 * Be warned that srcFilter and dstFilter are not checked, they
664 * are assumed to remain the same.
665 */
666SwsContext *sws_getCachedContext(SwsContext *context, int srcW, int srcH,
667 enum AVPixelFormat srcFormat, int dstW, int dstH,
668 enum AVPixelFormat dstFormat, int flags,
669 SwsFilter *srcFilter, SwsFilter *dstFilter,
670 const double *param);
671
672/**
673 * Convert an 8-bit paletted frame into a frame with a color depth of 32 bits.
674 *
675 * The output frame will have the same packed format as the palette.
676 *
677 * @param src source frame buffer
678 * @param dst destination frame buffer
679 * @param num_pixels number of pixels to convert
680 * @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
681 */
682void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);
683
684/**
685 * Convert an 8-bit paletted frame into a frame with a color depth of 24 bits.
686 *
687 * With the palette format "ABCD", the destination frame ends up with the format "ABC".
688 *
689 * @param src source frame buffer
690 * @param dst destination frame buffer
691 * @param num_pixels number of pixels to convert
692 * @param palette array with [256] entries, which must match color arrangement (RGB or BGR) of src
693 */
694void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels, const uint8_t *palette);
695
696/**
697 * @}
698 */
699
700#endif /* SWSCALE_SWSCALE_H */
701