2 * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef SWSCALE_SWSCALE_INTERNAL_H
22 #define SWSCALE_SWSCALE_INTERNAL_H
32 #include "libavutil/avassert.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/common.h"
35 #include "libavutil/intreadwrite.h"
36 #include "libavutil/log.h"
37 #include "libavutil/pixfmt.h"
38 #include "libavutil/pixdesc.h"
40 #define STR(s) AV_TOSTRING(s) // AV_STRINGIFY is too long
42 #define YUVRGB_TABLE_HEADROOM 256
44 #define MAX_FILTER_SIZE SWS_MAX_FILTER_SIZE
49 #define ALT32_CORR (-1)
64 #define RETCODE_USE_CASCADE -12345
68 typedef enum SwsDither {
78 typedef enum SwsAlphaBlend {
79 SWS_ALPHA_BLEND_NONE = 0,
80 SWS_ALPHA_BLEND_UNIFORM,
81 SWS_ALPHA_BLEND_CHECKERBOARD,
85 typedef int (*SwsFunc)(struct SwsContext *context, const uint8_t *src[],
86 int srcStride[], int srcSliceY, int srcSliceH,
87 uint8_t *dst[], int dstStride[]);
90 * Write one line of horizontally scaled data to planar output
91 * without any additional vertical scaling (or point-scaling).
93 * @param src scaled source data, 15bit for 8-10bit output,
94 * 19-bit for 16bit output (in int32_t)
95 * @param dest pointer to the output plane. For >8bit
96 * output, this is in uint16_t
97 * @param dstW width of destination in pixels
98 * @param dither ordered dither array of type int16_t and size 8
99 * @param offset Dither offset
101 typedef void (*yuv2planar1_fn)(const int16_t *src, uint8_t *dest, int dstW,
102 const uint8_t *dither, int offset);
105 * Write one line of horizontally scaled data to planar output
106 * with multi-point vertical scaling between input pixels.
108 * @param filter vertical luma/alpha scaling coefficients, 12bit [0,4096]
109 * @param src scaled luma (Y) or alpha (A) source data, 15bit for 8-10bit output,
110 * 19-bit for 16bit output (in int32_t)
111 * @param filterSize number of vertical input lines to scale
112 * @param dest pointer to output plane. For >8bit
113 * output, this is in uint16_t
114 * @param dstW width of destination pixels
115 * @param offset Dither offset
117 typedef void (*yuv2planarX_fn)(const int16_t *filter, int filterSize,
118 const int16_t **src, uint8_t *dest, int dstW,
119 const uint8_t *dither, int offset);
122 * Write one line of horizontally scaled chroma to interleaved output
123 * with multi-point vertical scaling between input pixels.
125 * @param c SWS scaling context
126 * @param chrFilter vertical chroma scaling coefficients, 12bit [0,4096]
127 * @param chrUSrc scaled chroma (U) source data, 15bit for 8-10bit output,
128 * 19-bit for 16bit output (in int32_t)
129 * @param chrVSrc scaled chroma (V) source data, 15bit for 8-10bit output,
130 * 19-bit for 16bit output (in int32_t)
131 * @param chrFilterSize number of vertical chroma input lines to scale
132 * @param dest pointer to the output plane. For >8bit
133 * output, this is in uint16_t
134 * @param dstW width of chroma planes
136 typedef void (*yuv2interleavedX_fn)(struct SwsContext *c,
137 const int16_t *chrFilter,
139 const int16_t **chrUSrc,
140 const int16_t **chrVSrc,
141 uint8_t *dest, int dstW);
144 * Write one line of horizontally scaled Y/U/V/A to packed-pixel YUV/RGB
145 * output without any additional vertical scaling (or point-scaling). Note
146 * that this function may do chroma scaling, see the "uvalpha" argument.
148 * @param c SWS scaling context
149 * @param lumSrc scaled luma (Y) source data, 15bit for 8-10bit output,
150 * 19-bit for 16bit output (in int32_t)
151 * @param chrUSrc scaled chroma (U) source data, 15bit for 8-10bit output,
152 * 19-bit for 16bit output (in int32_t)
153 * @param chrVSrc scaled chroma (V) source data, 15bit for 8-10bit output,
154 * 19-bit for 16bit output (in int32_t)
155 * @param alpSrc scaled alpha (A) source data, 15bit for 8-10bit output,
156 * 19-bit for 16bit output (in int32_t)
157 * @param dest pointer to the output plane. For 16bit output, this is
159 * @param dstW width of lumSrc and alpSrc in pixels, number of pixels
160 * to write into dest[]
161 * @param uvalpha chroma scaling coefficient for the second line of chroma
162 * pixels, either 2048 or 0. If 0, one chroma input is used
163 * for 2 output pixels (or if the SWS_FLAG_FULL_CHR_INT flag
164 * is set, it generates 1 output pixel). If 2048, two chroma
165 * input pixels should be averaged for 2 output pixels (this
166 * only happens if SWS_FLAG_FULL_CHR_INT is not set)
167 * @param y vertical line number for this output. This does not need
168 * to be used to calculate the offset in the destination,
169 * but can be used to generate comfort noise using dithering
170 * for some output formats.
172 typedef void (*yuv2packed1_fn)(struct SwsContext *c, const int16_t *lumSrc,
173 const int16_t *chrUSrc[2],
174 const int16_t *chrVSrc[2],
175 const int16_t *alpSrc, uint8_t *dest,
176 int dstW, int uvalpha, int y);
178 * Write one line of horizontally scaled Y/U/V/A to packed-pixel YUV/RGB
179 * output by doing bilinear scaling between two input lines.
181 * @param c SWS scaling context
182 * @param lumSrc scaled luma (Y) source data, 15bit for 8-10bit output,
183 * 19-bit for 16bit output (in int32_t)
184 * @param chrUSrc scaled chroma (U) source data, 15bit for 8-10bit output,
185 * 19-bit for 16bit output (in int32_t)
186 * @param chrVSrc scaled chroma (V) source data, 15bit for 8-10bit output,
187 * 19-bit for 16bit output (in int32_t)
188 * @param alpSrc scaled alpha (A) source data, 15bit for 8-10bit output,
189 * 19-bit for 16bit output (in int32_t)
190 * @param dest pointer to the output plane. For 16bit output, this is
192 * @param dstW width of lumSrc and alpSrc in pixels, number of pixels
193 * to write into dest[]
194 * @param yalpha luma/alpha scaling coefficients for the second input line.
195 * The first line's coefficients can be calculated by using
197 * @param uvalpha chroma scaling coefficient for the second input line. The
198 * first line's coefficients can be calculated by using
200 * @param y vertical line number for this output. This does not need
201 * to be used to calculate the offset in the destination,
202 * but can be used to generate comfort noise using dithering
203 * for some output formats.
205 typedef void (*yuv2packed2_fn)(struct SwsContext *c, const int16_t *lumSrc[2],
206 const int16_t *chrUSrc[2],
207 const int16_t *chrVSrc[2],
208 const int16_t *alpSrc[2],
210 int dstW, int yalpha, int uvalpha, int y);
212 * Write one line of horizontally scaled Y/U/V/A to packed-pixel YUV/RGB
213 * output by doing multi-point vertical scaling between input pixels.
215 * @param c SWS scaling context
216 * @param lumFilter vertical luma/alpha scaling coefficients, 12bit [0,4096]
217 * @param lumSrc scaled luma (Y) source data, 15bit for 8-10bit output,
218 * 19-bit for 16bit output (in int32_t)
219 * @param lumFilterSize number of vertical luma/alpha input lines to scale
220 * @param chrFilter vertical chroma scaling coefficients, 12bit [0,4096]
221 * @param chrUSrc scaled chroma (U) source data, 15bit for 8-10bit output,
222 * 19-bit for 16bit output (in int32_t)
223 * @param chrVSrc scaled chroma (V) source data, 15bit for 8-10bit output,
224 * 19-bit for 16bit output (in int32_t)
225 * @param chrFilterSize number of vertical chroma input lines to scale
226 * @param alpSrc scaled alpha (A) source data, 15bit for 8-10bit output,
227 * 19-bit for 16bit output (in int32_t)
228 * @param dest pointer to the output plane. For 16bit output, this is
230 * @param dstW width of lumSrc and alpSrc in pixels, number of pixels
231 * to write into dest[]
232 * @param y vertical line number for this output. This does not need
233 * to be used to calculate the offset in the destination,
234 * but can be used to generate comfort noise using dithering
235 * or some output formats.
237 typedef void (*yuv2packedX_fn)(struct SwsContext *c, const int16_t *lumFilter,
238 const int16_t **lumSrc, int lumFilterSize,
239 const int16_t *chrFilter,
240 const int16_t **chrUSrc,
241 const int16_t **chrVSrc, int chrFilterSize,
242 const int16_t **alpSrc, uint8_t *dest,
246 * Write one line of horizontally scaled Y/U/V/A to YUV/RGB
247 * output by doing multi-point vertical scaling between input pixels.
249 * @param c SWS scaling context
250 * @param lumFilter vertical luma/alpha scaling coefficients, 12bit [0,4096]
251 * @param lumSrc scaled luma (Y) source data, 15bit for 8-10bit output,
252 * 19-bit for 16bit output (in int32_t)
253 * @param lumFilterSize number of vertical luma/alpha input lines to scale
254 * @param chrFilter vertical chroma scaling coefficients, 12bit [0,4096]
255 * @param chrUSrc scaled chroma (U) source data, 15bit for 8-10bit output,
256 * 19-bit for 16bit output (in int32_t)
257 * @param chrVSrc scaled chroma (V) source data, 15bit for 8-10bit output,
258 * 19-bit for 16bit output (in int32_t)
259 * @param chrFilterSize number of vertical chroma input lines to scale
260 * @param alpSrc scaled alpha (A) source data, 15bit for 8-10bit output,
261 * 19-bit for 16bit output (in int32_t)
262 * @param dest pointer to the output planes. For 16bit output, this is
264 * @param dstW width of lumSrc and alpSrc in pixels, number of pixels
265 * to write into dest[]
266 * @param y vertical line number for this output. This does not need
267 * to be used to calculate the offset in the destination,
268 * but can be used to generate comfort noise using dithering
269 * or some output formats.
271 typedef void (*yuv2anyX_fn)(struct SwsContext *c, const int16_t *lumFilter,
272 const int16_t **lumSrc, int lumFilterSize,
273 const int16_t *chrFilter,
274 const int16_t **chrUSrc,
275 const int16_t **chrVSrc, int chrFilterSize,
276 const int16_t **alpSrc, uint8_t **dest,
280 struct SwsFilterDescriptor;
282 /* This struct should be aligned on at least a 32-byte boundary. */
283 typedef struct SwsContext {
285 * info on struct for av_log
287 const AVClass *av_class;
290 * Note that src, dst, srcStride, dstStride will be copied in the
291 * sws_scale() wrapper so they can be freely modified here.
294 int srcW; ///< Width of source luma/alpha planes.
295 int srcH; ///< Height of source luma/alpha planes.
296 int dstH; ///< Height of destination luma/alpha planes.
297 int chrSrcW; ///< Width of source chroma planes.
298 int chrSrcH; ///< Height of source chroma planes.
299 int chrDstW; ///< Width of destination chroma planes.
300 int chrDstH; ///< Height of destination chroma planes.
301 int lumXInc, chrXInc;
302 int lumYInc, chrYInc;
303 enum AVPixelFormat dstFormat; ///< Destination pixel format.
304 enum AVPixelFormat srcFormat; ///< Source pixel format.
305 int dstFormatBpp; ///< Number of bits per pixel of the destination pixel format.
306 int srcFormatBpp; ///< Number of bits per pixel of the source pixel format.
308 int chrSrcHSubSample; ///< Binary logarithm of horizontal subsampling factor between luma/alpha and chroma planes in source image.
309 int chrSrcVSubSample; ///< Binary logarithm of vertical subsampling factor between luma/alpha and chroma planes in source image.
310 int chrDstHSubSample; ///< Binary logarithm of horizontal subsampling factor between luma/alpha and chroma planes in destination image.
311 int chrDstVSubSample; ///< Binary logarithm of vertical subsampling factor between luma/alpha and chroma planes in destination image.
312 int vChrDrop; ///< Binary logarithm of extra vertical subsampling factor in source image chroma planes specified by user.
313 int sliceDir; ///< Direction that slices are fed to the scaler (1 = top-to-bottom, -1 = bottom-to-top).
314 double param[2]; ///< Input parameters for scaling algorithms that need them.
316 /* The cascaded_* fields allow spliting a scaler task into multiple
317 * sequential steps, this is for example used to limit the maximum
318 * downscaling factor that needs to be supported in one scaler.
320 struct SwsContext *cascaded_context[3];
321 int cascaded_tmpStride[4];
322 uint8_t *cascaded_tmp[4];
323 int cascaded1_tmpStride[4];
324 uint8_t *cascaded1_tmp[4];
328 int is_internal_gamma;
335 struct SwsSlice *slice;
336 struct SwsFilterDescriptor *desc;
338 uint32_t pal_yuv[256];
339 uint32_t pal_rgb[256];
342 * @name Scaled horizontal lines ring buffer.
343 * The horizontal scaler keeps just enough scaled lines in a ring buffer
344 * so they may be passed to the vertical scaler. The pointers to the
345 * allocated buffers for each line are duplicated in sequence in the ring
346 * buffer to simplify indexing and avoid wrapping around between lines
347 * inside the vertical scaler code. The wrapping is done before the
348 * vertical scaler is called.
351 int16_t **lumPixBuf; ///< Ring buffer for scaled horizontal luma plane lines to be fed to the vertical scaler.
352 int16_t **chrUPixBuf; ///< Ring buffer for scaled horizontal chroma plane lines to be fed to the vertical scaler.
353 int16_t **chrVPixBuf; ///< Ring buffer for scaled horizontal chroma plane lines to be fed to the vertical scaler.
354 int16_t **alpPixBuf; ///< Ring buffer for scaled horizontal alpha plane lines to be fed to the vertical scaler.
355 int vLumBufSize; ///< Number of vertical luma/alpha lines allocated in the ring buffer.
356 int vChrBufSize; ///< Number of vertical chroma lines allocated in the ring buffer.
357 int lastInLumBuf; ///< Last scaled horizontal luma/alpha line from source in the ring buffer.
358 int lastInChrBuf; ///< Last scaled horizontal chroma line from source in the ring buffer.
359 int lumBufIndex; ///< Index in ring buffer of the last scaled horizontal luma/alpha line from source.
360 int chrBufIndex; ///< Index in ring buffer of the last scaled horizontal chroma line from source.
363 uint8_t *formatConvBuffer;
366 * @name Horizontal and vertical filters.
367 * To better understand the following fields, here is a pseudo-code of
368 * their usage in filtering a horizontal line:
370 * for (i = 0; i < width; i++) {
372 * for (j = 0; j < filterSize; j++)
373 * dst[i] += src[ filterPos[i] + j ] * filter[ filterSize * i + j ];
374 * dst[i] >>= FRAC_BITS; // The actual implementation is fixed-point.
379 int16_t *hLumFilter; ///< Array of horizontal filter coefficients for luma/alpha planes.
380 int16_t *hChrFilter; ///< Array of horizontal filter coefficients for chroma planes.
381 int16_t *vLumFilter; ///< Array of vertical filter coefficients for luma/alpha planes.
382 int16_t *vChrFilter; ///< Array of vertical filter coefficients for chroma planes.
383 int32_t *hLumFilterPos; ///< Array of horizontal filter starting positions for each dst[i] for luma/alpha planes.
384 int32_t *hChrFilterPos; ///< Array of horizontal filter starting positions for each dst[i] for chroma planes.
385 int32_t *vLumFilterPos; ///< Array of vertical filter starting positions for each dst[i] for luma/alpha planes.
386 int32_t *vChrFilterPos; ///< Array of vertical filter starting positions for each dst[i] for chroma planes.
387 int hLumFilterSize; ///< Horizontal filter size for luma/alpha pixels.
388 int hChrFilterSize; ///< Horizontal filter size for chroma pixels.
389 int vLumFilterSize; ///< Vertical filter size for luma/alpha pixels.
390 int vChrFilterSize; ///< Vertical filter size for chroma pixels.
393 int lumMmxextFilterCodeSize; ///< Runtime-generated MMXEXT horizontal fast bilinear scaler code size for luma/alpha planes.
394 int chrMmxextFilterCodeSize; ///< Runtime-generated MMXEXT horizontal fast bilinear scaler code size for chroma planes.
395 uint8_t *lumMmxextFilterCode; ///< Runtime-generated MMXEXT horizontal fast bilinear scaler code for luma/alpha planes.
396 uint8_t *chrMmxextFilterCode; ///< Runtime-generated MMXEXT horizontal fast bilinear scaler code for chroma planes.
400 int dstY; ///< Last destination vertical line output from last slice.
401 int flags; ///< Flags passed by the user to select scaler algorithm, optimizations, subsampling, etc...
402 void *yuvTable; // pointer to the yuv->rgb table start so it can be freed()
403 // alignment ensures the offset can be added in a single
404 // instruction on e.g. ARM
405 DECLARE_ALIGNED(16, int, table_gV)[256 + 2*YUVRGB_TABLE_HEADROOM];
406 uint8_t *table_rV[256 + 2*YUVRGB_TABLE_HEADROOM];
407 uint8_t *table_gU[256 + 2*YUVRGB_TABLE_HEADROOM];
408 uint8_t *table_bU[256 + 2*YUVRGB_TABLE_HEADROOM];
409 DECLARE_ALIGNED(16, int32_t, input_rgb2yuv_table)[16+40*4]; // This table can contain both C and SIMD formatted values, the C vales are always at the XY_IDX points
419 #define RGB2YUV_SHIFT 15
421 int *dither_error[4];
424 int contrast, brightness, saturation; // for sws_getColorspaceDetails
425 int srcColorspaceTable[4];
426 int dstColorspaceTable[4];
427 int srcRange; ///< 0 = MPG YUV range, 1 = JPG YUV range (source image).
428 int dstRange; ///< 0 = MPG YUV range, 1 = JPG YUV range (destination image).
437 int yuv2rgb_y_offset;
439 int yuv2rgb_v2r_coeff;
440 int yuv2rgb_v2g_coeff;
441 int yuv2rgb_u2g_coeff;
442 int yuv2rgb_u2b_coeff;
444 #define RED_DITHER "0*8"
445 #define GREEN_DITHER "1*8"
446 #define BLUE_DITHER "2*8"
447 #define Y_COEFF "3*8"
448 #define VR_COEFF "4*8"
449 #define UB_COEFF "5*8"
450 #define VG_COEFF "6*8"
451 #define UG_COEFF "7*8"
452 #define Y_OFFSET "8*8"
453 #define U_OFFSET "9*8"
454 #define V_OFFSET "10*8"
455 #define LUM_MMX_FILTER_OFFSET "11*8"
456 #define CHR_MMX_FILTER_OFFSET "11*8+4*4*"AV_STRINGIFY(MAX_FILTER_SIZE)
457 #define DSTW_OFFSET "11*8+4*4*"AV_STRINGIFY(MAX_FILTER_SIZE)"*2"
458 #define ESP_OFFSET "11*8+4*4*"AV_STRINGIFY(MAX_FILTER_SIZE)"*2+8"
459 #define VROUNDER_OFFSET "11*8+4*4*"AV_STRINGIFY(MAX_FILTER_SIZE)"*2+16"
460 #define U_TEMP "11*8+4*4*"AV_STRINGIFY(MAX_FILTER_SIZE)"*2+24"
461 #define V_TEMP "11*8+4*4*"AV_STRINGIFY(MAX_FILTER_SIZE)"*2+32"
462 #define Y_TEMP "11*8+4*4*"AV_STRINGIFY(MAX_FILTER_SIZE)"*2+40"
463 #define ALP_MMX_FILTER_OFFSET "11*8+4*4*"AV_STRINGIFY(MAX_FILTER_SIZE)"*2+48"
464 #define UV_OFF_PX "11*8+4*4*"AV_STRINGIFY(MAX_FILTER_SIZE)"*3+48"
465 #define UV_OFF_BYTE "11*8+4*4*"AV_STRINGIFY(MAX_FILTER_SIZE)"*3+56"
466 #define DITHER16 "11*8+4*4*"AV_STRINGIFY(MAX_FILTER_SIZE)"*3+64"
467 #define DITHER32 "11*8+4*4*"AV_STRINGIFY(MAX_FILTER_SIZE)"*3+80"
468 #define DITHER32_INT (11*8+4*4*MAX_FILTER_SIZE*3+80) // value equal to above, used for checking that the struct hasn't been changed by mistake
470 DECLARE_ALIGNED(8, uint64_t, redDither);
471 DECLARE_ALIGNED(8, uint64_t, greenDither);
472 DECLARE_ALIGNED(8, uint64_t, blueDither);
474 DECLARE_ALIGNED(8, uint64_t, yCoeff);
475 DECLARE_ALIGNED(8, uint64_t, vrCoeff);
476 DECLARE_ALIGNED(8, uint64_t, ubCoeff);
477 DECLARE_ALIGNED(8, uint64_t, vgCoeff);
478 DECLARE_ALIGNED(8, uint64_t, ugCoeff);
479 DECLARE_ALIGNED(8, uint64_t, yOffset);
480 DECLARE_ALIGNED(8, uint64_t, uOffset);
481 DECLARE_ALIGNED(8, uint64_t, vOffset);
482 int32_t lumMmxFilter[4 * MAX_FILTER_SIZE];
483 int32_t chrMmxFilter[4 * MAX_FILTER_SIZE];
484 int dstW; ///< Width of destination luma/alpha planes.
485 DECLARE_ALIGNED(8, uint64_t, esp);
486 DECLARE_ALIGNED(8, uint64_t, vRounder);
487 DECLARE_ALIGNED(8, uint64_t, u_temp);
488 DECLARE_ALIGNED(8, uint64_t, v_temp);
489 DECLARE_ALIGNED(8, uint64_t, y_temp);
490 int32_t alpMmxFilter[4 * MAX_FILTER_SIZE];
491 // alignment of these values is not necessary, but merely here
492 // to maintain the same offset across x8632 and x86-64. Once we
493 // use proper offset macros in the asm, they can be removed.
494 DECLARE_ALIGNED(8, ptrdiff_t, uv_off); ///< offset (in pixels) between u and v planes
495 DECLARE_ALIGNED(8, ptrdiff_t, uv_offx2); ///< offset (in bytes) between u and v planes
496 DECLARE_ALIGNED(8, uint16_t, dither16)[8];
497 DECLARE_ALIGNED(8, uint32_t, dither32)[8];
499 const uint8_t *chrDither8, *lumDither8;
502 vector signed short CY;
503 vector signed short CRV;
504 vector signed short CBU;
505 vector signed short CGU;
506 vector signed short CGV;
507 vector signed short OY;
508 vector unsigned short CSHIFT;
509 vector signed short *vYCoeffsBank, *vCCoeffsBank;
514 /* pre defined color-spaces gamma */
515 #define XYZ_GAMMA (2.6f)
516 #define RGB_GAMMA (2.2f)
519 int16_t *xyzgammainv;
520 int16_t *rgbgammainv;
521 int16_t xyz2rgb_matrix[3][4];
522 int16_t rgb2xyz_matrix[3][4];
524 /* function pointers for swscale() */
525 yuv2planar1_fn yuv2plane1;
526 yuv2planarX_fn yuv2planeX;
527 yuv2interleavedX_fn yuv2nv12cX;
528 yuv2packed1_fn yuv2packed1;
529 yuv2packed2_fn yuv2packed2;
530 yuv2packedX_fn yuv2packedX;
531 yuv2anyX_fn yuv2anyX;
533 /// Unscaled conversion of luma plane to YV12 for horizontal scaler.
534 void (*lumToYV12)(uint8_t *dst, const uint8_t *src, const uint8_t *src2, const uint8_t *src3,
535 int width, uint32_t *pal);
536 /// Unscaled conversion of alpha plane to YV12 for horizontal scaler.
537 void (*alpToYV12)(uint8_t *dst, const uint8_t *src, const uint8_t *src2, const uint8_t *src3,
538 int width, uint32_t *pal);
539 /// Unscaled conversion of chroma planes to YV12 for horizontal scaler.
540 void (*chrToYV12)(uint8_t *dstU, uint8_t *dstV,
541 const uint8_t *src1, const uint8_t *src2, const uint8_t *src3,
542 int width, uint32_t *pal);
545 * Functions to read planar input, such as planar RGB, and convert
546 * internally to Y/UV/A.
549 void (*readLumPlanar)(uint8_t *dst, const uint8_t *src[4], int width, int32_t *rgb2yuv);
550 void (*readChrPlanar)(uint8_t *dstU, uint8_t *dstV, const uint8_t *src[4],
551 int width, int32_t *rgb2yuv);
552 void (*readAlpPlanar)(uint8_t *dst, const uint8_t *src[4], int width, int32_t *rgb2yuv);
556 * Scale one horizontal line of input data using a bilinear filter
557 * to produce one line of output data. Compared to SwsContext->hScale(),
558 * please take note of the following caveats when using these:
559 * - Scaling is done using only 7bit instead of 14bit coefficients.
560 * - You can use no more than 5 input pixels to produce 4 output
561 * pixels. Therefore, this filter should not be used for downscaling
562 * by more than ~20% in width (because that equals more than 5/4th
563 * downscaling and thus more than 5 pixels input per 4 pixels output).
564 * - In general, bilinear filters create artifacts during downscaling
565 * (even when <20%), because one output pixel will span more than one
566 * input pixel, and thus some pixels will need edges of both neighbor
567 * pixels to interpolate the output pixel. Since you can use at most
568 * two input pixels per output pixel in bilinear scaling, this is
569 * impossible and thus downscaling by any size will create artifacts.
570 * To enable this type of scaling, set SWS_FLAG_FAST_BILINEAR
571 * in SwsContext->flags.
574 void (*hyscale_fast)(struct SwsContext *c,
575 int16_t *dst, int dstWidth,
576 const uint8_t *src, int srcW, int xInc);
577 void (*hcscale_fast)(struct SwsContext *c,
578 int16_t *dst1, int16_t *dst2, int dstWidth,
579 const uint8_t *src1, const uint8_t *src2,
584 * Scale one horizontal line of input data using a filter over the input
585 * lines, to produce one (differently sized) line of output data.
587 * @param dst pointer to destination buffer for horizontally scaled
588 * data. If the number of bits per component of one
589 * destination pixel (SwsContext->dstBpc) is <= 10, data
590 * will be 15bpc in 16bits (int16_t) width. Else (i.e.
591 * SwsContext->dstBpc == 16), data will be 19bpc in
592 * 32bits (int32_t) width.
593 * @param dstW width of destination image
594 * @param src pointer to source data to be scaled. If the number of
595 * bits per component of a source pixel (SwsContext->srcBpc)
596 * is 8, this is 8bpc in 8bits (uint8_t) width. Else
597 * (i.e. SwsContext->dstBpc > 8), this is native depth
598 * in 16bits (uint16_t) width. In other words, for 9-bit
599 * YUV input, this is 9bpc, for 10-bit YUV input, this is
600 * 10bpc, and for 16-bit RGB or YUV, this is 16bpc.
601 * @param filter filter coefficients to be used per output pixel for
602 * scaling. This contains 14bpp filtering coefficients.
603 * Guaranteed to contain dstW * filterSize entries.
604 * @param filterPos position of the first input pixel to be used for
605 * each output pixel during scaling. Guaranteed to
606 * contain dstW entries.
607 * @param filterSize the number of input coefficients to be used (and
608 * thus the number of input pixels to be used) for
609 * creating a single output pixel. Is aligned to 4
610 * (and input coefficients thus padded with zeroes)
611 * to simplify creating SIMD code.
614 void (*hyScale)(struct SwsContext *c, int16_t *dst, int dstW,
615 const uint8_t *src, const int16_t *filter,
616 const int32_t *filterPos, int filterSize);
617 void (*hcScale)(struct SwsContext *c, int16_t *dst, int dstW,
618 const uint8_t *src, const int16_t *filter,
619 const int32_t *filterPos, int filterSize);
622 /// Color range conversion function for luma plane if needed.
623 void (*lumConvertRange)(int16_t *dst, int width);
624 /// Color range conversion function for chroma planes if needed.
625 void (*chrConvertRange)(int16_t *dst1, int16_t *dst2, int width);
627 int needs_hcscale; ///< Set if there are chroma planes to be converted.
631 SwsAlphaBlend alphablend;
633 //FIXME check init (where 0)
635 SwsFunc ff_yuv2rgb_get_func_ptr(SwsContext *c);
636 int ff_yuv2rgb_c_init_tables(SwsContext *c, const int inv_table[4],
637 int fullRange, int brightness,
638 int contrast, int saturation);
639 void ff_yuv2rgb_init_tables_ppc(SwsContext *c, const int inv_table[4],
640 int brightness, int contrast, int saturation);
642 void ff_updateMMXDitherTables(SwsContext *c, int dstY, int lumBufIndex, int chrBufIndex,
643 int lastInLumBuf, int lastInChrBuf);
645 av_cold void ff_sws_init_range_convert(SwsContext *c);
647 SwsFunc ff_yuv2rgb_init_x86(SwsContext *c);
648 SwsFunc ff_yuv2rgb_init_ppc(SwsContext *c);
650 static av_always_inline int is16BPS(enum AVPixelFormat pix_fmt)
652 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
654 return desc->comp[0].depth_minus1 == 15;
657 static av_always_inline int is9_OR_10BPS(enum AVPixelFormat pix_fmt)
659 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
661 return desc->comp[0].depth_minus1 >= 8 && desc->comp[0].depth_minus1 <= 13;
664 #define isNBPS(x) is9_OR_10BPS(x)
666 static av_always_inline int isBE(enum AVPixelFormat pix_fmt)
668 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
670 return desc->flags & AV_PIX_FMT_FLAG_BE;
673 static av_always_inline int isYUV(enum AVPixelFormat pix_fmt)
675 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
677 return !(desc->flags & AV_PIX_FMT_FLAG_RGB) && desc->nb_components >= 2;
680 static av_always_inline int isPlanarYUV(enum AVPixelFormat pix_fmt)
682 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
684 return ((desc->flags & AV_PIX_FMT_FLAG_PLANAR) && isYUV(pix_fmt));
687 static av_always_inline int isRGB(enum AVPixelFormat pix_fmt)
689 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
691 return (desc->flags & AV_PIX_FMT_FLAG_RGB);
696 (!(av_pix_fmt_desc_get(x)->flags & AV_PIX_FMT_FLAG_PAL) && \
697 av_pix_fmt_desc_get(x)->nb_components <= 2)
700 ((x) == AV_PIX_FMT_GRAY8 || \
701 (x) == AV_PIX_FMT_YA8 || \
702 (x) == AV_PIX_FMT_GRAY16BE || \
703 (x) == AV_PIX_FMT_GRAY16LE || \
704 (x) == AV_PIX_FMT_YA16BE || \
705 (x) == AV_PIX_FMT_YA16LE)
708 #define isRGBinInt(x) \
710 (x) == AV_PIX_FMT_RGB48BE || \
711 (x) == AV_PIX_FMT_RGB48LE || \
712 (x) == AV_PIX_FMT_RGB32 || \
713 (x) == AV_PIX_FMT_RGB32_1 || \
714 (x) == AV_PIX_FMT_RGB24 || \
715 (x) == AV_PIX_FMT_RGB565BE || \
716 (x) == AV_PIX_FMT_RGB565LE || \
717 (x) == AV_PIX_FMT_RGB555BE || \
718 (x) == AV_PIX_FMT_RGB555LE || \
719 (x) == AV_PIX_FMT_RGB444BE || \
720 (x) == AV_PIX_FMT_RGB444LE || \
721 (x) == AV_PIX_FMT_RGB8 || \
722 (x) == AV_PIX_FMT_RGB4 || \
723 (x) == AV_PIX_FMT_RGB4_BYTE || \
724 (x) == AV_PIX_FMT_RGBA64BE || \
725 (x) == AV_PIX_FMT_RGBA64LE || \
726 (x) == AV_PIX_FMT_MONOBLACK || \
727 (x) == AV_PIX_FMT_MONOWHITE \
729 #define isBGRinInt(x) \
731 (x) == AV_PIX_FMT_BGR48BE || \
732 (x) == AV_PIX_FMT_BGR48LE || \
733 (x) == AV_PIX_FMT_BGR32 || \
734 (x) == AV_PIX_FMT_BGR32_1 || \
735 (x) == AV_PIX_FMT_BGR24 || \
736 (x) == AV_PIX_FMT_BGR565BE || \
737 (x) == AV_PIX_FMT_BGR565LE || \
738 (x) == AV_PIX_FMT_BGR555BE || \
739 (x) == AV_PIX_FMT_BGR555LE || \
740 (x) == AV_PIX_FMT_BGR444BE || \
741 (x) == AV_PIX_FMT_BGR444LE || \
742 (x) == AV_PIX_FMT_BGR8 || \
743 (x) == AV_PIX_FMT_BGR4 || \
744 (x) == AV_PIX_FMT_BGR4_BYTE || \
745 (x) == AV_PIX_FMT_BGRA64BE || \
746 (x) == AV_PIX_FMT_BGRA64LE || \
747 (x) == AV_PIX_FMT_MONOBLACK || \
748 (x) == AV_PIX_FMT_MONOWHITE \
751 #define isRGBinBytes(x) ( \
752 (x) == AV_PIX_FMT_RGB48BE \
753 || (x) == AV_PIX_FMT_RGB48LE \
754 || (x) == AV_PIX_FMT_RGBA64BE \
755 || (x) == AV_PIX_FMT_RGBA64LE \
756 || (x) == AV_PIX_FMT_RGBA \
757 || (x) == AV_PIX_FMT_ARGB \
758 || (x) == AV_PIX_FMT_RGB24 \
760 #define isBGRinBytes(x) ( \
761 (x) == AV_PIX_FMT_BGR48BE \
762 || (x) == AV_PIX_FMT_BGR48LE \
763 || (x) == AV_PIX_FMT_BGRA64BE \
764 || (x) == AV_PIX_FMT_BGRA64LE \
765 || (x) == AV_PIX_FMT_BGRA \
766 || (x) == AV_PIX_FMT_ABGR \
767 || (x) == AV_PIX_FMT_BGR24 \
770 #define isBayer(x) ( \
771 (x)==AV_PIX_FMT_BAYER_BGGR8 \
772 || (x)==AV_PIX_FMT_BAYER_BGGR16LE \
773 || (x)==AV_PIX_FMT_BAYER_BGGR16BE \
774 || (x)==AV_PIX_FMT_BAYER_RGGB8 \
775 || (x)==AV_PIX_FMT_BAYER_RGGB16LE \
776 || (x)==AV_PIX_FMT_BAYER_RGGB16BE \
777 || (x)==AV_PIX_FMT_BAYER_GBRG8 \
778 || (x)==AV_PIX_FMT_BAYER_GBRG16LE \
779 || (x)==AV_PIX_FMT_BAYER_GBRG16BE \
780 || (x)==AV_PIX_FMT_BAYER_GRBG8 \
781 || (x)==AV_PIX_FMT_BAYER_GRBG16LE \
782 || (x)==AV_PIX_FMT_BAYER_GRBG16BE \
785 #define isAnyRGB(x) \
793 static av_always_inline int isALPHA(enum AVPixelFormat pix_fmt)
795 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
797 if (pix_fmt == AV_PIX_FMT_PAL8)
799 return desc->flags & AV_PIX_FMT_FLAG_ALPHA;
803 #define isPacked(x) ( \
804 (x)==AV_PIX_FMT_PAL8 \
805 || (x)==AV_PIX_FMT_YUYV422 \
806 || (x)==AV_PIX_FMT_YVYU422 \
807 || (x)==AV_PIX_FMT_UYVY422 \
808 || (x)==AV_PIX_FMT_YA8 \
809 || (x)==AV_PIX_FMT_YA16LE \
810 || (x)==AV_PIX_FMT_YA16BE \
811 || (x)==AV_PIX_FMT_AYUV64LE \
812 || (x)==AV_PIX_FMT_AYUV64BE \
817 static av_always_inline int isPacked(enum AVPixelFormat pix_fmt)
819 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
821 return ((desc->nb_components >= 2 && !(desc->flags & AV_PIX_FMT_FLAG_PLANAR)) ||
822 pix_fmt == AV_PIX_FMT_PAL8);
826 static av_always_inline int isPlanar(enum AVPixelFormat pix_fmt)
828 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
830 return (desc->nb_components >= 2 && (desc->flags & AV_PIX_FMT_FLAG_PLANAR));
833 static av_always_inline int isPackedRGB(enum AVPixelFormat pix_fmt)
835 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
837 return ((desc->flags & (AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_RGB)) == AV_PIX_FMT_FLAG_RGB);
840 static av_always_inline int isPlanarRGB(enum AVPixelFormat pix_fmt)
842 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
844 return ((desc->flags & (AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_RGB)) ==
845 (AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_RGB));
848 static av_always_inline int usePal(enum AVPixelFormat pix_fmt)
850 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
852 return (desc->flags & AV_PIX_FMT_FLAG_PAL) || (desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL);
855 extern const uint64_t ff_dither4[2];
856 extern const uint64_t ff_dither8[2];
858 extern const uint8_t ff_dither_2x2_4[3][8];
859 extern const uint8_t ff_dither_2x2_8[3][8];
860 extern const uint8_t ff_dither_4x4_16[5][8];
861 extern const uint8_t ff_dither_8x8_32[9][8];
862 extern const uint8_t ff_dither_8x8_73[9][8];
863 extern const uint8_t ff_dither_8x8_128[9][8];
864 extern const uint8_t ff_dither_8x8_220[9][8];
866 extern const int32_t ff_yuv2rgb_coeffs[8][4];
868 extern const AVClass sws_context_class;
871 * Set c->swscale to an unscaled converter if one exists for the specific
872 * source and destination formats, bit depths, flags, etc.
874 void ff_get_unscaled_swscale(SwsContext *c);
875 void ff_get_unscaled_swscale_ppc(SwsContext *c);
876 void ff_get_unscaled_swscale_arm(SwsContext *c);
879 * Return function pointer to fastest main scaler path function depending
880 * on architecture and available optimizations.
882 SwsFunc ff_getSwsFunc(SwsContext *c);
884 void ff_sws_init_input_funcs(SwsContext *c);
885 void ff_sws_init_output_funcs(SwsContext *c,
886 yuv2planar1_fn *yuv2plane1,
887 yuv2planarX_fn *yuv2planeX,
888 yuv2interleavedX_fn *yuv2nv12cX,
889 yuv2packed1_fn *yuv2packed1,
890 yuv2packed2_fn *yuv2packed2,
891 yuv2packedX_fn *yuv2packedX,
892 yuv2anyX_fn *yuv2anyX);
893 void ff_sws_init_swscale_ppc(SwsContext *c);
894 void ff_sws_init_swscale_x86(SwsContext *c);
896 void ff_hyscale_fast_c(SwsContext *c, int16_t *dst, int dstWidth,
897 const uint8_t *src, int srcW, int xInc);
898 void ff_hcscale_fast_c(SwsContext *c, int16_t *dst1, int16_t *dst2,
899 int dstWidth, const uint8_t *src1,
900 const uint8_t *src2, int srcW, int xInc);
901 int ff_init_hscaler_mmxext(int dstW, int xInc, uint8_t *filterCode,
902 int16_t *filter, int32_t *filterPos,
904 void ff_hyscale_fast_mmxext(SwsContext *c, int16_t *dst,
905 int dstWidth, const uint8_t *src,
907 void ff_hcscale_fast_mmxext(SwsContext *c, int16_t *dst1, int16_t *dst2,
908 int dstWidth, const uint8_t *src1,
909 const uint8_t *src2, int srcW, int xInc);
912 * Allocate and return an SwsContext.
913 * This is like sws_getContext() but does not perform the init step, allowing
914 * the user to set additional AVOptions.
916 * @see sws_getContext()
918 struct SwsContext *sws_alloc_set_opts(int srcW, int srcH, enum AVPixelFormat srcFormat,
919 int dstW, int dstH, enum AVPixelFormat dstFormat,
920 int flags, const double *param);
922 int ff_sws_alphablendaway(SwsContext *c, const uint8_t *src[],
923 int srcStride[], int srcSliceY, int srcSliceH,
924 uint8_t *dst[], int dstStride[]);
926 static inline void fillPlane16(uint8_t *plane, int stride, int width, int height, int y,
927 int alpha, int bits, const int big_endian)
930 uint8_t *ptr = plane + stride * y;
931 int v = alpha ? 0xFFFF>>(15-bits) : (1<<bits);
932 for (i = 0; i < height; i++) {
933 #define FILL(wfunc) \
934 for (j = 0; j < width; j++) {\
946 #define MAX_SLICE_PLANES 4
949 typedef struct SwsPlane
951 int available_lines; ///< max number of lines that can be hold by this plane
952 int sliceY; ///< index of first line
953 int sliceH; ///< number of lines
954 uint8_t **line; ///< line buffer
955 uint8_t **tmp; ///< Tmp line buffer used by mmx code
959 * Struct which defines a slice of an image to be scaled or a output for
961 * A slice can also be used as intermediate ring buffer for scaling steps.
963 typedef struct SwsSlice
965 int width; ///< Slice line width
966 int h_chr_sub_sample; ///< horizontal chroma subsampling factor
967 int v_chr_sub_sample; ///< vertical chroma subsampling factor
968 int is_ring; ///< flag to identify if this slice is a ring buffer
969 int should_free_lines; ///< flag to identify if there are dynamic allocated lines
970 enum AVPixelFormat fmt; ///< planes pixel format
971 SwsPlane plane[MAX_SLICE_PLANES]; ///< color planes
975 * Struct which holds all necessary data for processing a slice.
976 * A processing step can be a color conversion or horizontal/vertical scaling.
978 typedef struct SwsFilterDescriptor
980 SwsSlice *src; ///< Source slice
981 SwsSlice *dst; ///< Output slice
983 int alpha; ///< Flag for processing alpha channel
984 void *instance; ///< Filter instance data
986 /// Function for processing input slice sliceH lines starting from line sliceY
987 int (*process)(SwsContext *c, struct SwsFilterDescriptor *desc, int sliceY, int sliceH);
988 } SwsFilterDescriptor;
990 /// Color conversion instance data
991 typedef struct ColorContext
996 /// Scaler instance data
997 typedef struct FilterContext
1005 // warp input lines in the form (src + width*i + j) to slice format (line[i][j])
1006 int ff_init_slice_from_src(SwsSlice * s, uint8_t *src[4], int stride[4], int srcW, int lumY, int lumH, int chrY, int chrH);
1008 // Initialize scaler filter descriptor chain
1009 int ff_init_filters(SwsContext *c);
1011 // Free all filter data
1012 int ff_free_filters(SwsContext *c);
1015 function for applying ring buffer logic into slice s
1016 It checks if the slice can hold more @lum lines, if yes
1017 do nothing otherwise remove @lum least used lines.
1018 It applyes the same procedure for @chr lines.
1020 int ff_rotate_slice(SwsSlice *s, int lum, int chr);
1022 /// initializes lum pixel format conversion descriptor
1023 int ff_init_desc_fmt_convert(SwsFilterDescriptor *desc, SwsSlice * src, SwsSlice *dst, uint32_t *pal);
1025 /// initializes lum horizontal scaling descriptor
1026 int ff_init_desc_hscale(SwsFilterDescriptor *desc, SwsSlice *src, SwsSlice *dst, uint16_t *filter, int * filter_pos, int filter_size, int xInc);
1028 /// initializes chr prixel format conversion descriptor
1029 int ff_init_desc_cfmt_convert(SwsFilterDescriptor *desc, SwsSlice * src, SwsSlice *dst, uint32_t *pal);
1031 /// initializes chr horizontal scaling descriptor
1032 int ff_init_desc_chscale(SwsFilterDescriptor *desc, SwsSlice *src, SwsSlice *dst, uint16_t *filter, int * filter_pos, int filter_size, int xInc);
1034 int ff_init_desc_no_chr(SwsFilterDescriptor *desc, SwsSlice * src, SwsSlice *dst);
1036 //number of extra lines to process
1037 #define MAX_LINES_AHEAD 4
1041 #endif /* SWSCALE_SWSCALE_INTERNAL_H */