FFmpeg: libswscale/csputils.c Source File

FFmpeg
csputils.c
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1 /*
2  * Copyright (C) 2024 Niklas Haas
3  *
4  * This file is part of FFmpeg.
5  *
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.
10  *
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.
15  *
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
19  */
20 
21 #include "libavutil/csp.h"
22 
23 #include "csputils.h"
24 #include "format.h"
25 
26  void ff_sws_matrix3x3_mul(SwsMatrix3x3 *a, const SwsMatrix3x3 *b)
27 {
28  float a00 = a->m[0][0], a01 = a->m[0][1], a02 = a->m[0][2],
29  a10 = a->m[1][0], a11 = a->m[1][1], a12 = a->m[1][2],
30  a20 = a->m[2][0], a21 = a->m[2][1], a22 = a->m[2][2];
31 
32  for (int i = 0; i < 3; i++) {
33  a->m[0][i] = a00 * b->m[0][i] + a01 * b->m[1][i] + a02 * b->m[2][i];
34  a->m[1][i] = a10 * b->m[0][i] + a11 * b->m[1][i] + a12 * b->m[2][i];
35  a->m[2][i] = a20 * b->m[0][i] + a21 * b->m[1][i] + a22 * b->m[2][i];
36  }
37 }
38 
39  void ff_sws_matrix3x3_invert(SwsMatrix3x3 *mat)
40 {
41  double m00 = mat->m[0][0], m01 = mat->m[0][1], m02 = mat->m[0][2],
42  m10 = mat->m[1][0], m11 = mat->m[1][1], m12 = mat->m[1][2],
43  m20 = mat->m[2][0], m21 = mat->m[2][1], m22 = mat->m[2][2];
44 
45  // calculate the adjoint
46  double a00 = (m11 * m22 - m21 * m12);
47  double a01 = -(m01 * m22 - m21 * m02);
48  double a02 = (m01 * m12 - m11 * m02);
49  double a10 = -(m10 * m22 - m20 * m12);
50  double a11 = (m00 * m22 - m20 * m02);
51  double a12 = -(m00 * m12 - m10 * m02);
52  double a20 = (m10 * m21 - m20 * m11);
53  double a21 = -(m00 * m21 - m20 * m01);
54  double a22 = (m00 * m11 - m10 * m01);
55 
56  // calculate the determinant (as inverse == 1/det * adjoint,
57  // adjoint * m == identity * det, so this calculates the det)
58  double det = m00 * a00 + m10 * a01 + m20 * a02;
59  det = 1.0 / det;
60 
61  mat->m[0][0] = det * a00;
62  mat->m[0][1] = det * a01;
63  mat->m[0][2] = det * a02;
64  mat->m[1][0] = det * a10;
65  mat->m[1][1] = det * a11;
66  mat->m[1][2] = det * a12;
67  mat->m[2][0] = det * a20;
68  mat->m[2][1] = det * a21;
69  mat->m[2][2] = det * a22;
70 }
71 
72  void ff_sws_matrix3x3_apply(const SwsMatrix3x3 *mat, float vec[3])
73 {
74  float x = vec[0], y = vec[1], z = vec[2];
75 
76  for (int i = 0; i < 3; i++)
77  vec[i] = mat->m[i][0] * x + mat->m[i][1] * y + mat->m[i][2] * z;
78 }
79 
80 /* Recovers (X / Y) from a CIE xy value. */
81  static inline AVRational cie_X(AVCIExy xy)
82 {
83  return av_div_q(xy.x, xy.y);
84 }
85 
86 /* Recovers (Z / Y) from a CIE xy value. */
87  static inline AVRational cie_Z(AVCIExy xy)
88 {
89  return av_div_q(av_sub_q(av_sub_q(av_make_q(1, 1), xy.x), xy.y), xy.y);
90 }
91 
92  SwsMatrix3x3 ff_sws_rgb2xyz(const AVColorPrimariesDesc *desc)
93 {
94  SwsMatrix3x3 out = {{{0}}};
95  float S[3], X[3], Z[3], Xw, Zw;
96 
97  X[0] = av_q2d(cie_X(desc->prim.r));
98  X[1] = av_q2d(cie_X(desc->prim.g));
99  X[2] = av_q2d(cie_X(desc->prim.b));
100 
101  Z[0] = av_q2d(cie_Z(desc->prim.r));
102  Z[1] = av_q2d(cie_Z(desc->prim.g));
103  Z[2] = av_q2d(cie_Z(desc->prim.b));
104 
105  Xw = av_q2d(cie_X(desc->wp));
106  Zw = av_q2d(cie_Z(desc->wp));
107 
108  /* S = XYZ^-1 * W */
109  for (int i = 0; i < 3; i++) {
110  out.m[0][i] = X[i];
111  out.m[1][i] = 1.0f;
112  out.m[2][i] = Z[i];
113  }
114 
115  ff_sws_matrix3x3_invert(&out);
116 
117  for (int i = 0; i < 3; i++)
118  S[i] = out.m[i][0] * Xw + out.m[i][1] + out.m[i][2] * Zw;
119 
120  /* M = [Sc * XYZc] */
121  for (int i = 0; i < 3; i++) {
122  out.m[0][i] = S[i] * X[i];
123  out.m[1][i] = S[i];
124  out.m[2][i] = S[i] * Z[i];
125  }
126 
127  return out;
128 }
129 
130  SwsMatrix3x3 ff_sws_xyz2rgb(const AVColorPrimariesDesc *prim)
131 {
132  SwsMatrix3x3 out = ff_sws_rgb2xyz(prim);
133  ff_sws_matrix3x3_invert(&out);
134  return out;
135 }
136 
137 /* Matrix used in CAT16, a revised one-step linear transform method */
138  static const SwsMatrix3x3 m_cat16 = {{
139  { 0.401288f, 0.650173f, -0.051461f },
140  { -0.250268f, 1.204414f, 0.045854f },
141  { -0.002079f, 0.048952f, 0.953127f },
142 }};
143 
144  static const SwsMatrix3x3 m_cat16_inv = {{
145  { 1.862068f, -1.011255f, 0.149187f },
146  { 0.387527f, 0.621447f, -0.008974f },
147  { -0.015841f, -0.034123f, 1.049964f },
148 }};
149 
150 // M := M * XYZd<-XYZs
151  static void apply_chromatic_adaptation(AVWhitepointCoefficients src,
152  AVWhitepointCoefficients dst,
153  SwsMatrix3x3 *mat)
154 {
155  SwsMatrix3x3 tmp = {0};
156  float C[3][2];
157  const float srcX = av_q2d(cie_X(src)),
158  srcZ = av_q2d(cie_Z(src)),
159  dstX = av_q2d(cie_X(dst)),
160  dstZ = av_q2d(cie_Z(dst));
161 
162  if (ff_cie_xy_equal(src, dst))
163  return;
164 
165  // Linear "von Kries" method, adapted from CIECAM16
166  // http://www.brucelindbloom.com/index.html?Eqn_ChromAdapt.html
167 
168  for (int i = 0; i < 3; i++) {
169  // source cone
170  C[i][0] = m_cat16.m[i][0] * srcX
171  + m_cat16.m[i][1] * 1
172  + m_cat16.m[i][2] * srcZ,
173 
174  // dest cone
175  C[i][1] = m_cat16.m[i][0] * dstX
176  + m_cat16.m[i][1] * 1
177  + m_cat16.m[i][2] * dstZ;
178  }
179 
180  // tmp := I * [Cd/Cs] * Ma
181  for (int i = 0; i < 3; i++)
182  tmp.m[i][i] = C[i][1] / C[i][0];
183 
184  ff_sws_matrix3x3_mul(&tmp, &m_cat16);
185 
186  // M := M * Ma^-1 * tmp
187  ff_sws_matrix3x3_mul(mat, &m_cat16_inv);
188  ff_sws_matrix3x3_mul(mat, &tmp);
189 }
190 
191  SwsMatrix3x3 ff_sws_get_adaptation(const AVPrimaryCoefficients *prim,
192  AVWhitepointCoefficients from,
193  AVWhitepointCoefficients to)
194 {
195  SwsMatrix3x3 rgb2xyz, xyz2rgb;
196  const AVColorPrimariesDesc csp = {
197  .prim = *prim,
198  .wp = from,
199  };
200 
201  rgb2xyz = ff_sws_rgb2xyz(&csp);
202  xyz2rgb = ff_sws_xyz2rgb(&csp);
203  apply_chromatic_adaptation(from, to, &xyz2rgb);
204  ff_sws_matrix3x3_mul(&xyz2rgb, &rgb2xyz);
205  return xyz2rgb;
206 }
207 
208  static const AVWhitepointCoefficients d65 = {
209  .x = {3127, 10000},
210  .y = {3290, 10000}
211 };
212 
213  static const SwsMatrix3x3 hpe = {{ /* HPE XYZ->LMS (D65) method */
214  { 0.40024f, 0.70760f, -0.08081f },
215  { -0.22630f, 1.16532f, 0.04570f },
216  { 0.00000f, 0.00000f, 0.91822f },
217 }};
218 
219  SwsMatrix3x3 ff_sws_ipt_rgb2lms(const AVColorPrimariesDesc *prim)
220 {
221  const float c = 0.04f; // 4% crosstalk
222  SwsMatrix3x3 rgb2xyz;
223  SwsMatrix3x3 m = {{
224  { 1 - 2*c, c, c },
225  { c, 1 - 2*c, c },
226  { c, c, 1 - 2*c },
227  }};
228 
229  ff_sws_matrix3x3_mul(&m, &hpe);
230 
231  // Apply chromatic adaptation to D65 if the input white point differs
232  apply_chromatic_adaptation(prim->wp, d65, &m);
233 
234  rgb2xyz = ff_sws_rgb2xyz(prim);
235  ff_sws_matrix3x3_mul(&m, &rgb2xyz);
236  return m;
237 }
238 
239  SwsMatrix3x3 ff_sws_ipt_lms2rgb(const AVColorPrimariesDesc *prim)
240 {
241  SwsMatrix3x3 rgb2lms = ff_sws_ipt_rgb2lms(prim);
242  ff_sws_matrix3x3_invert(&rgb2lms);
243  return rgb2lms;
244 }
245 
246 /* Test the sign of 'p' relative to the line 'ab' (barycentric coordinates) */
247  static int test_point_line(AVCIExy p, AVCIExy a, AVCIExy b)
248 {
249  return av_cmp_q(av_mul_q(av_sub_q(p.x, b.x), av_sub_q(a.y, b.y)),
250  av_mul_q(av_sub_q(a.x, b.x), av_sub_q(p.y, b.y)));
251 }
252 
253 
254 /* Test if a point is entirely inside a gamut */
255  static float test_point_gamut(const AVCIExy point,
256  const AVPrimaryCoefficients *prim)
257 {
258  int d1 = test_point_line(point, prim->r, prim->g),
259  d2 = test_point_line(point, prim->g, prim->b),
260  d3 = test_point_line(point, prim->b, prim->r);
261 
262  bool has_neg = d1 < 0 || d2 < 0 || d3 < 0,
263  has_pos = d1 > 0 || d2 > 0 || d3 > 0;
264 
265  return !(has_neg && has_pos);
266 }
267 
268  bool ff_prim_superset(const AVPrimaryCoefficients *a, const AVPrimaryCoefficients *b)
269 {
270  return test_point_gamut(b->r, a) &&
271  test_point_gamut(b->g, a) &&
272  test_point_gamut(b->b, a);
273 }
274 
275  const float ff_pq_eotf_lut[PQ_LUT_SIZE+1] = {
276  0.0000000e+00f, 4.0422718e-05f, 1.3111372e-04f, 2.6236826e-04f, 4.3151495e-04f, 6.3746885e-04f, 8.7982383e-04f, 1.1585362e-03f,
277  1.4737819e-03f, 1.8258818e-03f, 2.2152586e-03f, 2.6424098e-03f, 3.1078907e-03f, 3.6123021e-03f, 4.1562821e-03f, 4.7405001e-03f,
278  5.3656521e-03f, 6.0324583e-03f, 6.7416568e-03f, 7.4940095e-03f, 8.2902897e-03f, 9.1312924e-03f, 1.0017822e-02f, 1.0950702e-02f,
279  1.1930764e-02f, 1.2958861e-02f, 1.4035847e-02f, 1.5162600e-02f, 1.6340000e-02f, 1.7568948e-02f, 1.8850346e-02f, 2.0185119e-02f,
280  2.1574192e-02f, 2.3018509e-02f, 2.4519029e-02f, 2.6076704e-02f, 2.7692516e-02f, 2.9367449e-02f, 3.1102509e-02f, 3.2898690e-02f,
281  3.4757019e-02f, 3.6678526e-02f, 3.8664261e-02f, 4.0715262e-02f, 4.2832601e-02f, 4.5017354e-02f, 4.7270617e-02f, 4.9593473e-02f,
282  5.1987040e-02f, 5.4452441e-02f, 5.6990819e-02f, 5.9603301e-02f, 6.2291055e-02f, 6.5055251e-02f, 6.7897080e-02f, 7.0817717e-02f,
283  7.3818379e-02f, 7.6900283e-02f, 8.0064675e-02f, 8.3312774e-02f, 8.6645849e-02f, 9.0065169e-02f, 9.3572031e-02f, 9.7167704e-02f,
284  1.0085351e-01f, 1.0463077e-01f, 1.0850082e-01f, 1.1246501e-01f, 1.1652473e-01f, 1.2068130e-01f, 1.2493614e-01f, 1.2929066e-01f,
285  1.3374626e-01f, 1.3830439e-01f, 1.4296648e-01f, 1.4773401e-01f, 1.5260848e-01f, 1.5759132e-01f, 1.6268405e-01f, 1.6788821e-01f,
286  1.7320534e-01f, 1.7863697e-01f, 1.8418467e-01f, 1.8985004e-01f, 1.9563470e-01f, 2.0154019e-01f, 2.0756818e-01f, 2.1372031e-01f,
287  2.1999824e-01f, 2.2640365e-01f, 2.3293824e-01f, 2.3960372e-01f, 2.4640186e-01f, 2.5333431e-01f, 2.6040288e-01f, 2.6760935e-01f,
288  2.7495552e-01f, 2.8244319e-01f, 2.9007421e-01f, 2.9785041e-01f, 3.0577373e-01f, 3.1384594e-01f, 3.2206899e-01f, 3.3044481e-01f,
289  3.3897533e-01f, 3.4766253e-01f, 3.5650838e-01f, 3.6551487e-01f, 3.7468409e-01f, 3.8401794e-01f, 3.9351855e-01f, 4.0318799e-01f,
290  4.1302836e-01f, 4.2304177e-01f, 4.3323036e-01f, 4.4359629e-01f, 4.5414181e-01f, 4.6486897e-01f, 4.7578006e-01f, 4.8687732e-01f,
291  4.9816302e-01f, 5.0963944e-01f, 5.2130889e-01f, 5.3317369e-01f, 5.4523628e-01f, 5.5749886e-01f, 5.6996391e-01f, 5.8263384e-01f,
292  5.9551111e-01f, 6.0859816e-01f, 6.2189750e-01f, 6.3541162e-01f, 6.4914307e-01f, 6.6309439e-01f, 6.7726819e-01f, 6.9166705e-01f,
293  7.0629384e-01f, 7.2115077e-01f, 7.3624074e-01f, 7.5156646e-01f, 7.6713065e-01f, 7.8293608e-01f, 7.9898553e-01f, 8.1528181e-01f,
294  8.3182776e-01f, 8.4862623e-01f, 8.6568012e-01f, 8.8299235e-01f, 9.0056585e-01f, 9.1840360e-01f, 9.3650860e-01f, 9.5488388e-01f,
295  9.7353277e-01f, 9.9245779e-01f, 1.0116623e+00f, 1.0311496e+00f, 1.0509226e+00f, 1.0709847e+00f, 1.0913391e+00f, 1.1119889e+00f,
296  1.1329376e+00f, 1.1541885e+00f, 1.1757448e+00f, 1.1976100e+00f, 1.2197875e+00f, 1.2422807e+00f, 1.2650931e+00f, 1.2882282e+00f,
297  1.3116900e+00f, 1.3354812e+00f, 1.3596059e+00f, 1.3840676e+00f, 1.4088701e+00f, 1.4340170e+00f, 1.4595121e+00f, 1.4853593e+00f,
298  1.5115622e+00f, 1.5381247e+00f, 1.5650507e+00f, 1.5923442e+00f, 1.6200090e+00f, 1.6480492e+00f, 1.6764688e+00f, 1.7052718e+00f,
299  1.7344629e+00f, 1.7640451e+00f, 1.7940233e+00f, 1.8244015e+00f, 1.8551840e+00f, 1.8863752e+00f, 1.9179792e+00f, 1.9500006e+00f,
300  1.9824437e+00f, 2.0153130e+00f, 2.0486129e+00f, 2.0823479e+00f, 2.1165227e+00f, 2.1511419e+00f, 2.1862101e+00f, 2.2217319e+00f,
301  2.2577128e+00f, 2.2941563e+00f, 2.3310679e+00f, 2.3684523e+00f, 2.4063146e+00f, 2.4446597e+00f, 2.4834925e+00f, 2.5228182e+00f,
302  2.5626417e+00f, 2.6029683e+00f, 2.6438031e+00f, 2.6851514e+00f, 2.7270184e+00f, 2.7694094e+00f, 2.8123299e+00f, 2.8557852e+00f,
303  2.8997815e+00f, 2.9443230e+00f, 2.9894159e+00f, 3.0350657e+00f, 3.0812783e+00f, 3.1280593e+00f, 3.1754144e+00f, 3.2233495e+00f,
304  3.2718705e+00f, 3.3209833e+00f, 3.3706938e+00f, 3.4210082e+00f, 3.4719324e+00f, 3.5234727e+00f, 3.5756351e+00f, 3.6284261e+00f,
305  3.6818526e+00f, 3.7359195e+00f, 3.7906340e+00f, 3.8460024e+00f, 3.9020315e+00f, 3.9587277e+00f, 4.0160977e+00f, 4.0741483e+00f,
306  4.1328861e+00f, 4.1923181e+00f, 4.2524511e+00f, 4.3132921e+00f, 4.3748480e+00f, 4.4371260e+00f, 4.5001332e+00f, 4.5638768e+00f,
307  4.6283650e+00f, 4.6936032e+00f, 4.7595999e+00f, 4.8263624e+00f, 4.8938982e+00f, 4.9622151e+00f, 5.0313205e+00f, 5.1012223e+00f,
308  5.1719283e+00f, 5.2434463e+00f, 5.3157843e+00f, 5.3889502e+00f, 5.4629521e+00f, 5.5377982e+00f, 5.6134968e+00f, 5.6900560e+00f,
309  5.7674843e+00f, 5.8457900e+00f, 5.9249818e+00f, 6.0050682e+00f, 6.0860578e+00f, 6.1679595e+00f, 6.2507819e+00f, 6.3345341e+00f,
310  6.4192275e+00f, 6.5048661e+00f, 6.5914616e+00f, 6.6790231e+00f, 6.7675600e+00f, 6.8570816e+00f, 6.9475975e+00f, 7.0391171e+00f,
311  7.1316500e+00f, 7.2252060e+00f, 7.3197948e+00f, 7.4154264e+00f, 7.5121107e+00f, 7.6098577e+00f, 7.7086777e+00f, 7.8085807e+00f,
312  7.9095772e+00f, 8.0116775e+00f, 8.1148922e+00f, 8.2192318e+00f, 8.3247071e+00f, 8.4313287e+00f, 8.5391076e+00f, 8.6480548e+00f,
313  8.7581812e+00f, 8.8694982e+00f, 8.9820168e+00f, 9.0957485e+00f, 9.2107048e+00f, 9.3268971e+00f, 9.4443372e+00f, 9.5630368e+00f,
314  9.6830115e+00f, 9.8042658e+00f, 9.9268155e+00f, 1.0050673e+01f, 1.0175850e+01f, 1.0302359e+01f, 1.0430213e+01f, 1.0559425e+01f,
315  1.0690006e+01f, 1.0821970e+01f, 1.0955331e+01f, 1.1090100e+01f, 1.1226290e+01f, 1.1363917e+01f, 1.1502992e+01f, 1.1643529e+01f,
316  1.1785542e+01f, 1.1929044e+01f, 1.2074050e+01f, 1.2220573e+01f, 1.2368628e+01f, 1.2518229e+01f, 1.2669390e+01f, 1.2822125e+01f,
317  1.2976449e+01f, 1.3132377e+01f, 1.3289925e+01f, 1.3449105e+01f, 1.3609935e+01f, 1.3772429e+01f, 1.3936602e+01f, 1.4102470e+01f,
318  1.4270054e+01f, 1.4439360e+01f, 1.4610407e+01f, 1.4783214e+01f, 1.4957794e+01f, 1.5134166e+01f, 1.5312345e+01f, 1.5492348e+01f,
319  1.5674192e+01f, 1.5857894e+01f, 1.6043471e+01f, 1.6230939e+01f, 1.6420317e+01f, 1.6611622e+01f, 1.6804871e+01f, 1.7000083e+01f,
320  1.7197275e+01f, 1.7396465e+01f, 1.7597672e+01f, 1.7800914e+01f, 1.8006210e+01f, 1.8213578e+01f, 1.8423038e+01f, 1.8634608e+01f,
321  1.8848308e+01f, 1.9064157e+01f, 1.9282175e+01f, 1.9502381e+01f, 1.9724796e+01f, 1.9949439e+01f, 2.0176331e+01f, 2.0405492e+01f,
322  2.0636950e+01f, 2.0870711e+01f, 2.1106805e+01f, 2.1345250e+01f, 2.1586071e+01f, 2.1829286e+01f, 2.2074919e+01f, 2.2322992e+01f,
323  2.2573525e+01f, 2.2826542e+01f, 2.3082066e+01f, 2.3340118e+01f, 2.3600721e+01f, 2.3863900e+01f, 2.4129676e+01f, 2.4398074e+01f,
324  2.4669117e+01f, 2.4942828e+01f, 2.5219233e+01f, 2.5498355e+01f, 2.5780219e+01f, 2.6064849e+01f, 2.6352271e+01f, 2.6642509e+01f,
325  2.6935589e+01f, 2.7231536e+01f, 2.7530377e+01f, 2.7832137e+01f, 2.8136843e+01f, 2.8444520e+01f, 2.8755196e+01f, 2.9068898e+01f,
326  2.9385662e+01f, 2.9705496e+01f, 3.0028439e+01f, 3.0354517e+01f, 3.0683758e+01f, 3.1016192e+01f, 3.1351846e+01f, 3.1690750e+01f,
327  3.2032932e+01f, 3.2378422e+01f, 3.2727250e+01f, 3.3079445e+01f, 3.3435038e+01f, 3.3794058e+01f, 3.4156537e+01f, 3.4522505e+01f,
328  3.4891993e+01f, 3.5265034e+01f, 3.5641658e+01f, 3.6021897e+01f, 3.6405785e+01f, 3.6793353e+01f, 3.7184634e+01f, 3.7579661e+01f,
329  3.7978468e+01f, 3.8381088e+01f, 3.8787555e+01f, 3.9197904e+01f, 3.9612169e+01f, 4.0030385e+01f, 4.0452587e+01f, 4.0878810e+01f,
330  4.1309104e+01f, 4.1743478e+01f, 4.2181981e+01f, 4.2624651e+01f, 4.3071525e+01f, 4.3522639e+01f, 4.3978031e+01f, 4.4437739e+01f,
331  4.4901803e+01f, 4.5370259e+01f, 4.5843148e+01f, 4.6320508e+01f, 4.6802379e+01f, 4.7288801e+01f, 4.7779815e+01f, 4.8275461e+01f,
332  4.8775780e+01f, 4.9280813e+01f, 4.9790603e+01f, 5.0305191e+01f, 5.0824620e+01f, 5.1348933e+01f, 5.1878172e+01f, 5.2412382e+01f,
333  5.2951607e+01f, 5.3495890e+01f, 5.4045276e+01f, 5.4599811e+01f, 5.5159540e+01f, 5.5724510e+01f, 5.6294765e+01f, 5.6870353e+01f,
334  5.7451339e+01f, 5.8037735e+01f, 5.8629606e+01f, 5.9227001e+01f, 5.9829968e+01f, 6.0438557e+01f, 6.1052818e+01f, 6.1672799e+01f,
335  6.2298552e+01f, 6.2930128e+01f, 6.3567578e+01f, 6.4210953e+01f, 6.4860306e+01f, 6.5515690e+01f, 6.6177157e+01f, 6.6844762e+01f,
336  6.7518558e+01f, 6.8198599e+01f, 6.8884942e+01f, 6.9577641e+01f, 7.0276752e+01f, 7.0982332e+01f, 7.1694438e+01f, 7.2413127e+01f,
337  7.3138457e+01f, 7.3870486e+01f, 7.4609273e+01f, 7.5354878e+01f, 7.6107361e+01f, 7.6866782e+01f, 7.7633203e+01f, 7.8406684e+01f,
338  7.9187312e+01f, 7.9975101e+01f, 8.0770139e+01f, 8.1572490e+01f, 8.2382216e+01f, 8.3199385e+01f, 8.4024059e+01f, 8.4856307e+01f,
339  8.5696193e+01f, 8.6543786e+01f, 8.7399153e+01f, 8.8262362e+01f, 8.9133482e+01f, 9.0012582e+01f, 9.0899733e+01f, 9.1795005e+01f,
340  9.2698470e+01f, 9.3610199e+01f, 9.4530265e+01f, 9.5458741e+01f, 9.6395701e+01f, 9.7341219e+01f, 9.8295370e+01f, 9.9258231e+01f,
341  1.0022988e+02f, 1.0121039e+02f, 1.0219984e+02f, 1.0319830e+02f, 1.0420587e+02f, 1.0522261e+02f, 1.0624862e+02f, 1.0728396e+02f,
342  1.0832872e+02f, 1.0938299e+02f, 1.1044684e+02f, 1.1152036e+02f, 1.1260365e+02f, 1.1369677e+02f, 1.1479982e+02f, 1.1591288e+02f,
343  1.1703605e+02f, 1.1816941e+02f, 1.1931305e+02f, 1.2046706e+02f, 1.2163153e+02f, 1.2280656e+02f, 1.2399223e+02f, 1.2518864e+02f,
344  1.2639596e+02f, 1.2761413e+02f, 1.2884333e+02f, 1.3008365e+02f, 1.3133519e+02f, 1.3259804e+02f, 1.3387231e+02f, 1.3515809e+02f,
345  1.3645549e+02f, 1.3776461e+02f, 1.3908555e+02f, 1.4041841e+02f, 1.4176331e+02f, 1.4312034e+02f, 1.4448961e+02f, 1.4587123e+02f,
346  1.4726530e+02f, 1.4867194e+02f, 1.5009126e+02f, 1.5152336e+02f, 1.5296837e+02f, 1.5442638e+02f, 1.5589753e+02f, 1.5738191e+02f,
347  1.5887965e+02f, 1.6039087e+02f, 1.6191567e+02f, 1.6345419e+02f, 1.6500655e+02f, 1.6657285e+02f, 1.6815323e+02f, 1.6974781e+02f,
348  1.7135672e+02f, 1.7298007e+02f, 1.7461800e+02f, 1.7627063e+02f, 1.7793810e+02f, 1.7962053e+02f, 1.8131805e+02f, 1.8303080e+02f,
349  1.8475891e+02f, 1.8650252e+02f, 1.8826176e+02f, 1.9003676e+02f, 1.9182767e+02f, 1.9363463e+02f, 1.9545777e+02f, 1.9729724e+02f,
350  1.9915319e+02f, 2.0102575e+02f, 2.0291507e+02f, 2.0482131e+02f, 2.0674460e+02f, 2.0868510e+02f, 2.1064296e+02f, 2.1261833e+02f,
351  2.1461136e+02f, 2.1662222e+02f, 2.1865105e+02f, 2.2069802e+02f, 2.2276328e+02f, 2.2484700e+02f, 2.2694934e+02f, 2.2907045e+02f,
352  2.3121064e+02f, 2.3336982e+02f, 2.3554827e+02f, 2.3774618e+02f, 2.3996370e+02f, 2.4220102e+02f, 2.4445831e+02f, 2.4673574e+02f,
353  2.4903349e+02f, 2.5135174e+02f, 2.5369067e+02f, 2.5605046e+02f, 2.5843129e+02f, 2.6083336e+02f, 2.6325684e+02f, 2.6570192e+02f,
354  2.6816880e+02f, 2.7065767e+02f, 2.7316872e+02f, 2.7570215e+02f, 2.7825815e+02f, 2.8083692e+02f, 2.8343867e+02f, 2.8606359e+02f,
355  2.8871189e+02f, 2.9138378e+02f, 2.9407946e+02f, 2.9679914e+02f, 2.9954304e+02f, 3.0231137e+02f, 3.0510434e+02f, 3.0792217e+02f,
356  3.1076508e+02f, 3.1363330e+02f, 3.1652704e+02f, 3.1944653e+02f, 3.2239199e+02f, 3.2536367e+02f, 3.2836178e+02f, 3.3138657e+02f,
357  3.3443826e+02f, 3.3751710e+02f, 3.4062333e+02f, 3.4375718e+02f, 3.4691890e+02f, 3.5010874e+02f, 3.5332694e+02f, 3.5657377e+02f,
358  3.5984946e+02f, 3.6315428e+02f, 3.6648848e+02f, 3.6985233e+02f, 3.7324608e+02f, 3.7667000e+02f, 3.8012436e+02f, 3.8360942e+02f,
359  3.8712547e+02f, 3.9067276e+02f, 3.9425159e+02f, 3.9786223e+02f, 4.0150496e+02f, 4.0518006e+02f, 4.0888783e+02f, 4.1262855e+02f,
360  4.1640274e+02f, 4.2021025e+02f, 4.2405159e+02f, 4.2792707e+02f, 4.3183699e+02f, 4.3578166e+02f, 4.3976138e+02f, 4.4377647e+02f,
361  4.4782724e+02f, 4.5191401e+02f, 4.5603709e+02f, 4.6019681e+02f, 4.6439350e+02f, 4.6862749e+02f, 4.7289910e+02f, 4.7720867e+02f,
362  4.8155654e+02f, 4.8594305e+02f, 4.9036854e+02f, 4.9483336e+02f, 4.9933787e+02f, 5.0388240e+02f, 5.0846733e+02f, 5.1309301e+02f,
363  5.1775981e+02f, 5.2246808e+02f, 5.2721821e+02f, 5.3201056e+02f, 5.3684551e+02f, 5.4172344e+02f, 5.4664473e+02f, 5.5160978e+02f,
364  5.5661897e+02f, 5.6167269e+02f, 5.6677135e+02f, 5.7191535e+02f, 5.7710508e+02f, 5.8234097e+02f, 5.8762342e+02f, 5.9295285e+02f,
365  5.9832968e+02f, 6.0375433e+02f, 6.0922723e+02f, 6.1474882e+02f, 6.2031952e+02f, 6.2593979e+02f, 6.3161006e+02f, 6.3733078e+02f,
366  6.4310241e+02f, 6.4892540e+02f, 6.5480021e+02f, 6.6072730e+02f, 6.6670715e+02f, 6.7274023e+02f, 6.7882702e+02f, 6.8496800e+02f,
367  6.9116365e+02f, 6.9741447e+02f, 7.0372096e+02f, 7.1008361e+02f, 7.1650293e+02f, 7.2297942e+02f, 7.2951361e+02f, 7.3610602e+02f,
368  7.4275756e+02f, 7.4946797e+02f, 7.5623818e+02f, 7.6306873e+02f, 7.6996016e+02f, 7.7691302e+02f, 7.8392787e+02f, 7.9100526e+02f,
369  7.9814576e+02f, 8.0534993e+02f, 8.1261837e+02f, 8.1995163e+02f, 8.2735032e+02f, 8.3481501e+02f, 8.4234632e+02f, 8.4994483e+02f,
370  8.5761116e+02f, 8.6534592e+02f, 8.7314974e+02f, 8.8102323e+02f, 8.8896702e+02f, 8.9698176e+02f, 9.0506809e+02f, 9.1322665e+02f,
371  9.2145810e+02f, 9.2976310e+02f, 9.3814232e+02f, 9.4659643e+02f, 9.5512612e+02f, 9.6373206e+02f, 9.7241496e+02f, 9.8117550e+02f,
372  9.9001441e+02f, 9.9893238e+02f, 1.0079301e+03f, 1.0170084e+03f, 1.0261679e+03f, 1.0354094e+03f, 1.0447337e+03f, 1.0541414e+03f,
373  1.0636334e+03f, 1.0732104e+03f, 1.0828731e+03f, 1.0926225e+03f, 1.1024592e+03f, 1.1123841e+03f, 1.1223979e+03f, 1.1325016e+03f,
374  1.1426958e+03f, 1.1529814e+03f, 1.1633594e+03f, 1.1738304e+03f, 1.1843954e+03f, 1.1950552e+03f, 1.2058107e+03f, 1.2166627e+03f,
375  1.2276122e+03f, 1.2386601e+03f, 1.2498072e+03f, 1.2610544e+03f, 1.2724027e+03f, 1.2838531e+03f, 1.2954063e+03f, 1.3070635e+03f,
376  1.3188262e+03f, 1.3306940e+03f, 1.3426686e+03f, 1.3547509e+03f, 1.3669420e+03f, 1.3792428e+03f, 1.3916544e+03f, 1.4041778e+03f,
377  1.4168140e+03f, 1.4295640e+03f, 1.4424289e+03f, 1.4554098e+03f, 1.4685078e+03f, 1.4817238e+03f, 1.4950591e+03f, 1.5085147e+03f,
378  1.5220916e+03f, 1.5357912e+03f, 1.5496144e+03f, 1.5635624e+03f, 1.5776364e+03f, 1.5918375e+03f, 1.6061670e+03f, 1.6206260e+03f,
379  1.6352156e+03f, 1.6499372e+03f, 1.6647920e+03f, 1.6797811e+03f, 1.6949059e+03f, 1.7101676e+03f, 1.7255674e+03f, 1.7411067e+03f,
380  1.7567867e+03f, 1.7726087e+03f, 1.7885742e+03f, 1.8046844e+03f, 1.8209406e+03f, 1.8373443e+03f, 1.8538967e+03f, 1.8705994e+03f,
381  1.8874536e+03f, 1.9044608e+03f, 1.9216225e+03f, 1.9389401e+03f, 1.9564150e+03f, 1.9740486e+03f, 1.9918426e+03f, 2.0097984e+03f,
382  2.0279175e+03f, 2.0462014e+03f, 2.0646517e+03f, 2.0832699e+03f, 2.1020577e+03f, 2.1210165e+03f, 2.1401481e+03f, 2.1594540e+03f,
383  2.1789359e+03f, 2.1985954e+03f, 2.2184342e+03f, 2.2384540e+03f, 2.2586565e+03f, 2.2790434e+03f, 2.2996165e+03f, 2.3203774e+03f,
384  2.3413293e+03f, 2.3624714e+03f, 2.3838068e+03f, 2.4053372e+03f, 2.4270646e+03f, 2.4489908e+03f, 2.4711177e+03f, 2.4934471e+03f,
385  2.5159811e+03f, 2.5387214e+03f, 2.5616702e+03f, 2.5848293e+03f, 2.6082007e+03f, 2.6317866e+03f, 2.6555888e+03f, 2.6796095e+03f,
386  2.7038507e+03f, 2.7283145e+03f, 2.7530031e+03f, 2.7779186e+03f, 2.8030631e+03f, 2.8284388e+03f, 2.8540479e+03f, 2.8798927e+03f,
387  2.9059754e+03f, 2.9322983e+03f, 2.9588635e+03f, 2.9856736e+03f, 3.0127308e+03f, 3.0400374e+03f, 3.0675959e+03f, 3.0954086e+03f,
388  3.1234780e+03f, 3.1518066e+03f, 3.1803969e+03f, 3.2092512e+03f, 3.2383723e+03f, 3.2677625e+03f, 3.2974246e+03f, 3.3273611e+03f,
389  3.3575747e+03f, 3.3880680e+03f, 3.4188437e+03f, 3.4499045e+03f, 3.4812533e+03f, 3.5128926e+03f, 3.5448255e+03f, 3.5770546e+03f,
390  3.6095828e+03f, 3.6424131e+03f, 3.6755483e+03f, 3.7089914e+03f, 3.7427454e+03f, 3.7768132e+03f, 3.8111979e+03f, 3.8459027e+03f,
391  3.8809304e+03f, 3.9162844e+03f, 3.9519678e+03f, 3.9879837e+03f, 4.0243354e+03f, 4.0610261e+03f, 4.0980592e+03f, 4.1354380e+03f,
392  4.1731681e+03f, 4.2112483e+03f, 4.2496844e+03f, 4.2884798e+03f, 4.3276381e+03f, 4.3671627e+03f, 4.4070572e+03f, 4.4473253e+03f,
393  4.4879706e+03f, 4.5289968e+03f, 4.5704076e+03f, 4.6122068e+03f, 4.6543981e+03f, 4.6969854e+03f, 4.7399727e+03f, 4.7833637e+03f,
394  4.8271625e+03f, 4.8713731e+03f, 4.9159995e+03f, 4.9610458e+03f, 5.0065162e+03f, 5.0524147e+03f, 5.0987457e+03f, 5.1455133e+03f,
395  5.1927219e+03f, 5.2403759e+03f, 5.2884795e+03f, 5.3370373e+03f, 5.3860537e+03f, 5.4355333e+03f, 5.4854807e+03f, 5.5359004e+03f,
396  5.5867972e+03f, 5.6381757e+03f, 5.6900408e+03f, 5.7423972e+03f, 5.7952499e+03f, 5.8486037e+03f, 5.9024637e+03f, 5.9568349e+03f,
397  6.0117223e+03f, 6.0671311e+03f, 6.1230664e+03f, 6.1795336e+03f, 6.2365379e+03f, 6.2940847e+03f, 6.3521793e+03f, 6.4108273e+03f,
398  6.4700342e+03f, 6.5298056e+03f, 6.5901471e+03f, 6.6510643e+03f, 6.7125632e+03f, 6.7746495e+03f, 6.8373290e+03f, 6.9006078e+03f,
399  6.9644918e+03f, 7.0289872e+03f, 7.0941001e+03f, 7.1598366e+03f, 7.2262031e+03f, 7.2932059e+03f, 7.3608513e+03f, 7.4291460e+03f,
400  7.4981006e+03f, 7.5677134e+03f, 7.6379952e+03f, 7.7089527e+03f, 7.7805929e+03f, 7.8529226e+03f, 7.9259489e+03f, 7.9996786e+03f,
401  8.0741191e+03f, 8.1492774e+03f, 8.2251609e+03f, 8.3017769e+03f, 8.3791329e+03f, 8.4572364e+03f, 8.5360950e+03f, 8.6157163e+03f,
402  8.6961082e+03f, 8.7772786e+03f, 8.8592352e+03f, 8.9419862e+03f, 9.0255397e+03f, 9.1099038e+03f, 9.1950869e+03f, 9.2810973e+03f,
403  9.3679435e+03f, 9.4556340e+03f, 9.5441776e+03f, 9.6335829e+03f, 9.7238588e+03f, 9.8150143e+03f, 9.9070583e+03f, 1.0000000e+04f,
404  1e4f, /* extra padding to avoid out of bounds access */
405 };
out
FILE * out
Definition: movenc.c:55
AVColorPrimariesDesc::wp
AVWhitepointCoefficients wp
Definition: csp.h:79
cie_Z
static AVRational cie_Z(AVCIExy xy)
Definition: csputils.c:87
AVColorPrimariesDesc
Struct that contains both white point location and primaries location, providing the complete descrip...
Definition: csp.h:78
av_div_q
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
ff_sws_matrix3x3_mul
void ff_sws_matrix3x3_mul(SwsMatrix3x3 *a, const SwsMatrix3x3 *b)
Definition: csputils.c:26
b
#define b
Definition: input.c:42
ff_sws_matrix3x3_apply
void ff_sws_matrix3x3_apply(const SwsMatrix3x3 *mat, float vec[3])
Definition: csputils.c:72
SwsMatrix3x3::m
float m[3][3]
Definition: csputils.h:48
ff_cie_xy_equal
static int ff_cie_xy_equal(const AVCIExy a, const AVCIExy b)
Definition: format.h:42
ff_pq_eotf_lut
const float ff_pq_eotf_lut[PQ_LUT_SIZE+1]
Definition: csputils.c:275
av_sub_q
AVRational av_sub_q(AVRational b, AVRational c)
Subtract one rational from another.
Definition: rational.c:101
format.h
S
#define S(s, c, i)
Definition: flacdsp_template.c:46
AVPrimaryCoefficients
Struct defining the red, green, and blue primary locations in terms of CIE 1931 chromaticity x and y.
Definition: csp.h:64
C
s EdgeDetect Foobar g libavfilter vf_edgedetect c libavfilter vf_foobar c edit libavfilter and add an entry for foobar following the pattern of the other filters edit libavfilter allfilters and add an entry for foobar following the pattern of the other filters configure make j< whatever > ffmpeg ffmpeg i you should get a foobar png with Lena edge detected That s your new playground is ready Some little details about what s going which in turn will define variables for the build system and the C
Definition: writing_filters.txt:58
hpe
static const SwsMatrix3x3 hpe
Definition: csputils.c:213
av_q2d
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
from
const char * from
Definition: jacosubdec.c:66
ff_sws_ipt_rgb2lms
SwsMatrix3x3 ff_sws_ipt_rgb2lms(const AVColorPrimariesDesc *prim)
Definition: csputils.c:219
tmp
static uint8_t tmp[40]
Definition: aes_ctr.c:52
ff_sws_rgb2xyz
SwsMatrix3x3 ff_sws_rgb2xyz(const AVColorPrimariesDesc *desc)
Definition: csputils.c:92
test_point_gamut
static float test_point_gamut(const AVCIExy point, const AVPrimaryCoefficients *prim)
Definition: csputils.c:255
test_point_line
static int test_point_line(AVCIExy p, AVCIExy a, AVCIExy b)
Definition: csputils.c:247
m_cat16
static const SwsMatrix3x3 m_cat16
Definition: csputils.c:138
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
ff_sws_ipt_lms2rgb
SwsMatrix3x3 ff_sws_ipt_lms2rgb(const AVColorPrimariesDesc *prim)
Definition: csputils.c:239
apply_chromatic_adaptation
static void apply_chromatic_adaptation(AVWhitepointCoefficients src, AVWhitepointCoefficients dst, SwsMatrix3x3 *mat)
Definition: csputils.c:151
AVCIExy
Struct containing chromaticity x and y values for the standard CIE 1931 chromaticity definition.
Definition: csp.h:56
ff_sws_get_adaptation
SwsMatrix3x3 ff_sws_get_adaptation(const AVPrimaryCoefficients *prim, AVWhitepointCoefficients from, AVWhitepointCoefficients to)
Definition: csputils.c:191
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
d65
static const AVWhitepointCoefficients d65
Definition: csputils.c:208
AVCIExy::x
AVRational x
Definition: csp.h:57
AVPrimaryCoefficients::b
AVCIExy b
Definition: csp.h:65
AVPrimaryCoefficients::r
AVCIExy r
Definition: csp.h:65
f
f
Definition: af_crystalizer.c:122
to
const char * to
Definition: webvttdec.c:35
dst
uint8_t ptrdiff_t const uint8_t ptrdiff_t int intptr_t intptr_t int int16_t * dst
Definition: dsp.h:87
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:424
av_make_q
static AVRational av_make_q(int num, int den)
Create an AVRational.
Definition: rational.h:71
xyz2rgb
static const float xyz2rgb[3][3]
Definition: tiff.c:1896
AVPrimaryCoefficients::g
AVCIExy g
Definition: csp.h:65
ff_prim_superset
bool ff_prim_superset(const AVPrimaryCoefficients *a, const AVPrimaryCoefficients *b)
Returns true if 'b' is entirely contained in 'a'.
Definition: csputils.c:268
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
csp.h
SwsMatrix3x3
Definition: csputils.h:47
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
cie_X
static AVRational cie_X(AVCIExy xy)
Definition: csputils.c:81
av_cmp_q
static int av_cmp_q(AVRational a, AVRational b)
Compare two rationals.
Definition: rational.h:89
X
@ X
Definition: vf_addroi.c:27
rgb2lms
static const float rgb2lms[3][3]
Definition: vf_grayworld.c:67
AVCIExy::y
AVRational y
Definition: csp.h:57
ff_sws_matrix3x3_invert
void ff_sws_matrix3x3_invert(SwsMatrix3x3 *mat)
Definition: csputils.c:39
ff_sws_xyz2rgb
SwsMatrix3x3 ff_sws_xyz2rgb(const AVColorPrimariesDesc *prim)
Definition: csputils.c:130
PQ_LUT_SIZE
@ PQ_LUT_SIZE
Definition: csputils.h:87
Windows::Graphics::DirectX::Direct3D11::p
IDirect3DDxgiInterfaceAccess _COM_Outptr_ void ** p
Definition: vsrc_gfxcapture_winrt.hpp:53
av_mul_q
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
desc
const char * desc
Definition: libsvtav1.c:79
m_cat16_inv
static const SwsMatrix3x3 m_cat16_inv
Definition: csputils.c:144
AVColorPrimariesDesc::prim
AVPrimaryCoefficients prim
Definition: csp.h:80
csputils.h
src
#define src
Definition: vp8dsp.c:248
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