FFmpeg
yuv2rgb_altivec.c
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1 /*
2  * AltiVec acceleration for colorspace conversion
3  *
4  * copyright (C) 2004 Marc Hoffman <marc.hoffman@analog.com>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /*
24  * Convert I420 YV12 to RGB in various formats,
25  * it rejects images that are not in 420 formats,
26  * it rejects images that don't have widths of multiples of 16,
27  * it rejects images that don't have heights of multiples of 2.
28  * Reject defers to C simulation code.
29  *
30  * Lots of optimizations to be done here.
31  *
32  * 1. Need to fix saturation code. I just couldn't get it to fly with packs
33  * and adds, so we currently use max/min to clip.
34  *
35  * 2. The inefficient use of chroma loading needs a bit of brushing up.
36  *
37  * 3. Analysis of pipeline stalls needs to be done. Use shark to identify
38  * pipeline stalls.
39  *
40  *
41  * MODIFIED to calculate coeffs from currently selected color space.
42  * MODIFIED core to be a macro where you specify the output format.
43  * ADDED UYVY conversion which is never called due to some thing in swscale.
44  * CORRECTED algorithim selection to be strict on input formats.
45  * ADDED runtime detection of AltiVec.
46  *
47  * ADDED altivec_yuv2packedX vertical scl + RGB converter
48  *
49  * March 27,2004
50  * PERFORMANCE ANALYSIS
51  *
52  * The C version uses 25% of the processor or ~250Mips for D1 video rawvideo
53  * used as test.
54  * The AltiVec version uses 10% of the processor or ~100Mips for D1 video
55  * same sequence.
56  *
57  * 720 * 480 * 30 ~10MPS
58  *
59  * so we have roughly 10 clocks per pixel. This is too high, something has
60  * to be wrong.
61  *
62  * OPTIMIZED clip codes to utilize vec_max and vec_packs removing the
63  * need for vec_min.
64  *
65  * OPTIMIZED DST OUTPUT cache/DMA controls. We are pretty much guaranteed to
66  * have the input video frame, it was just decompressed so it probably resides
67  * in L1 caches. However, we are creating the output video stream. This needs
68  * to use the DSTST instruction to optimize for the cache. We couple this with
69  * the fact that we are not going to be visiting the input buffer again so we
70  * mark it Least Recently Used. This shaves 25% of the processor cycles off.
71  *
72  * Now memcpy is the largest mips consumer in the system, probably due
73  * to the inefficient X11 stuff.
74  *
75  * GL libraries seem to be very slow on this machine 1.33Ghz PB running
76  * Jaguar, this is not the case for my 1Ghz PB. I thought it might be
77  * a versioning issue, however I have libGL.1.2.dylib for both
78  * machines. (We need to figure this out now.)
79  *
80  * GL2 libraries work now with patch for RGB32.
81  *
82  * NOTE: quartz vo driver ARGB32_to_RGB24 consumes 30% of the processor.
83  *
84  * Integrated luma prescaling adjustment for saturation/contrast/brightness
85  * adjustment.
86  */
87 
88 #include <stdio.h>
89 #include <stdlib.h>
90 #include <string.h>
91 #include <inttypes.h>
92 
93 #include "config.h"
94 #include "libswscale/rgb2rgb.h"
95 #include "libswscale/swscale.h"
96 #include "libswscale/swscale_internal.h"
97 #include "libavutil/attributes.h"
98 #include "libavutil/cpu.h"
99 #include "libavutil/pixdesc.h"
100 #include "yuv2rgb_altivec.h"
101 
102 #if HAVE_ALTIVEC
103 
104 #undef PROFILE_THE_BEAST
105 #undef INC_SCALING
106 
107 typedef unsigned char ubyte;
108 typedef signed char sbyte;
109 
110 /* RGB interleaver, 16 planar pels 8-bit samples per channel in
111  * homogeneous vector registers x0,x1,x2 are interleaved with the
112  * following technique:
113  *
114  * o0 = vec_mergeh(x0, x1);
115  * o1 = vec_perm(o0, x2, perm_rgb_0);
116  * o2 = vec_perm(o0, x2, perm_rgb_1);
117  * o3 = vec_mergel(x0, x1);
118  * o4 = vec_perm(o3, o2, perm_rgb_2);
119  * o5 = vec_perm(o3, o2, perm_rgb_3);
120  *
121  * perm_rgb_0: o0(RG).h v1(B) --> o1*
122  * 0 1 2 3 4
123  * rgbr|gbrg|brgb|rgbr
124  * 0010 0100 1001 0010
125  * 0102 3145 2673 894A
126  *
127  * perm_rgb_1: o0(RG).h v1(B) --> o2
128  * 0 1 2 3 4
129  * gbrg|brgb|bbbb|bbbb
130  * 0100 1001 1111 1111
131  * B5CD 6EF7 89AB CDEF
132  *
133  * perm_rgb_2: o3(RG).l o2(rgbB.l) --> o4*
134  * 0 1 2 3 4
135  * gbrg|brgb|rgbr|gbrg
136  * 1111 1111 0010 0100
137  * 89AB CDEF 0182 3945
138  *
139  * perm_rgb_2: o3(RG).l o2(rgbB.l) ---> o5*
140  * 0 1 2 3 4
141  * brgb|rgbr|gbrg|brgb
142  * 1001 0010 0100 1001
143  * a67b 89cA BdCD eEFf
144  */
145 static const vector unsigned char
146  perm_rgb_0 = { 0x00, 0x01, 0x10, 0x02, 0x03, 0x11, 0x04, 0x05,
147  0x12, 0x06, 0x07, 0x13, 0x08, 0x09, 0x14, 0x0a },
148  perm_rgb_1 = { 0x0b, 0x15, 0x0c, 0x0d, 0x16, 0x0e, 0x0f, 0x17,
149  0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f },
150  perm_rgb_2 = { 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
151  0x00, 0x01, 0x18, 0x02, 0x03, 0x19, 0x04, 0x05 },
152  perm_rgb_3 = { 0x1a, 0x06, 0x07, 0x1b, 0x08, 0x09, 0x1c, 0x0a,
153  0x0b, 0x1d, 0x0c, 0x0d, 0x1e, 0x0e, 0x0f, 0x1f };
154 
155 #define vec_merge3(x2, x1, x0, y0, y1, y2) \
156  do { \
157  __typeof__(x0) o0, o2, o3; \
158  o0 = vec_mergeh(x0, x1); \
159  y0 = vec_perm(o0, x2, perm_rgb_0); \
160  o2 = vec_perm(o0, x2, perm_rgb_1); \
161  o3 = vec_mergel(x0, x1); \
162  y1 = vec_perm(o3, o2, perm_rgb_2); \
163  y2 = vec_perm(o3, o2, perm_rgb_3); \
164  } while (0)
165 
166 #define vec_mstbgr24(x0, x1, x2, ptr) \
167  do { \
168  __typeof__(x0) _0, _1, _2; \
169  vec_merge3(x0, x1, x2, _0, _1, _2); \
170  vec_st(_0, 0, ptr++); \
171  vec_st(_1, 0, ptr++); \
172  vec_st(_2, 0, ptr++); \
173  } while (0)
174 
175 #define vec_mstrgb24(x0, x1, x2, ptr) \
176  do { \
177  __typeof__(x0) _0, _1, _2; \
178  vec_merge3(x2, x1, x0, _0, _1, _2); \
179  vec_st(_0, 0, ptr++); \
180  vec_st(_1, 0, ptr++); \
181  vec_st(_2, 0, ptr++); \
182  } while (0)
183 
184 /* pack the pixels in rgb0 format
185  * msb R
186  * lsb 0
187  */
188 #define vec_mstrgb32(T, x0, x1, x2, x3, ptr) \
189  do { \
190  T _0, _1, _2, _3; \
191  _0 = vec_mergeh(x0, x1); \
192  _1 = vec_mergeh(x2, x3); \
193  _2 = (T) vec_mergeh((vector unsigned short) _0, \
194  (vector unsigned short) _1); \
195  _3 = (T) vec_mergel((vector unsigned short) _0, \
196  (vector unsigned short) _1); \
197  vec_st(_2, 0 * 16, (T *) ptr); \
198  vec_st(_3, 1 * 16, (T *) ptr); \
199  _0 = vec_mergel(x0, x1); \
200  _1 = vec_mergel(x2, x3); \
201  _2 = (T) vec_mergeh((vector unsigned short) _0, \
202  (vector unsigned short) _1); \
203  _3 = (T) vec_mergel((vector unsigned short) _0, \
204  (vector unsigned short) _1); \
205  vec_st(_2, 2 * 16, (T *) ptr); \
206  vec_st(_3, 3 * 16, (T *) ptr); \
207  ptr += 4; \
208  } while (0)
209 
210 /*
211  * 1 0 1.4021 | | Y |
212  * 1 -0.3441 -0.7142 |x| Cb|
213  * 1 1.7718 0 | | Cr|
214  *
215  *
216  * Y: [-128 127]
217  * Cb/Cr : [-128 127]
218  *
219  * typical YUV conversion works on Y: 0-255 this version has been
220  * optimized for JPEG decoding.
221  */
222 
223 #if HAVE_BIGENDIAN
224 #define vec_unh(x) \
225  (vector signed short) \
226  vec_perm(x, (__typeof__(x)) { 0 }, \
227  ((vector unsigned char) { \
228  0x10, 0x00, 0x10, 0x01, 0x10, 0x02, 0x10, 0x03, \
229  0x10, 0x04, 0x10, 0x05, 0x10, 0x06, 0x10, 0x07 }))
230 
231 #define vec_unl(x) \
232  (vector signed short) \
233  vec_perm(x, (__typeof__(x)) { 0 }, \
234  ((vector unsigned char) { \
235  0x10, 0x08, 0x10, 0x09, 0x10, 0x0A, 0x10, 0x0B, \
236  0x10, 0x0C, 0x10, 0x0D, 0x10, 0x0E, 0x10, 0x0F }))
237 #else
238 #define vec_unh(x)(vector signed short) vec_mergeh(x,(__typeof__(x)) { 0 })
239 #define vec_unl(x)(vector signed short) vec_mergel(x,(__typeof__(x)) { 0 })
240 #endif
241 
242 #define vec_clip_s16(x) \
243  vec_max(vec_min(x, ((vector signed short) { \
244  235, 235, 235, 235, 235, 235, 235, 235 })), \
245  ((vector signed short) { 16, 16, 16, 16, 16, 16, 16, 16 }))
246 
247 #define vec_packclp(x, y) \
248  (vector unsigned char) \
249  vec_packs((vector unsigned short) \
250  vec_max(x, ((vector signed short) { 0 })), \
251  (vector unsigned short) \
252  vec_max(y, ((vector signed short) { 0 })))
253 
254 static inline void cvtyuvtoRGB(SwsContext *c, vector signed short Y,
255  vector signed short U, vector signed short V,
256  vector signed short *R, vector signed short *G,
257  vector signed short *B)
258 {
259  vector signed short vx, ux, uvx;
260 
261  Y = vec_mradds(Y, c->CY, c->OY);
262  U = vec_sub(U, (vector signed short)
263  vec_splat((vector signed short) { 128 }, 0));
264  V = vec_sub(V, (vector signed short)
265  vec_splat((vector signed short) { 128 }, 0));
266 
267  // ux = (CBU * (u << c->CSHIFT) + 0x4000) >> 15;
268  ux = vec_sl(U, c->CSHIFT);
269  *B = vec_mradds(ux, c->CBU, Y);
270 
271  // vx = (CRV * (v << c->CSHIFT) + 0x4000) >> 15;
272  vx = vec_sl(V, c->CSHIFT);
273  *R = vec_mradds(vx, c->CRV, Y);
274 
275  // uvx = ((CGU * u) + (CGV * v)) >> 15;
276  uvx = vec_mradds(U, c->CGU, Y);
277  *G = vec_mradds(V, c->CGV, uvx);
278 }
279 
280 /*
281  * ------------------------------------------------------------------------------
282  * CS converters
283  * ------------------------------------------------------------------------------
284  */
285 
286 #define DEFCSP420_CVT(name, out_pixels) \
287 static int altivec_ ## name(SwsContext *c, const unsigned char **in, \
288  int *instrides, int srcSliceY, int srcSliceH, \
289  unsigned char **oplanes, int *outstrides) \
290 { \
291  int w = c->srcW; \
292  int h = srcSliceH; \
293  int i, j; \
294  int instrides_scl[3]; \
295  vector unsigned char y0, y1; \
296  \
297  vector signed char u, v; \
298  \
299  vector signed short Y0, Y1, Y2, Y3; \
300  vector signed short U, V; \
301  vector signed short vx, ux, uvx; \
302  vector signed short vx0, ux0, uvx0; \
303  vector signed short vx1, ux1, uvx1; \
304  vector signed short R0, G0, B0; \
305  vector signed short R1, G1, B1; \
306  vector unsigned char R, G, B; \
307  \
308  const vector unsigned char *y1ivP, *y2ivP, *uivP, *vivP; \
309  vector unsigned char align_perm; \
310  \
311  vector signed short lCY = c->CY; \
312  vector signed short lOY = c->OY; \
313  vector signed short lCRV = c->CRV; \
314  vector signed short lCBU = c->CBU; \
315  vector signed short lCGU = c->CGU; \
316  vector signed short lCGV = c->CGV; \
317  vector unsigned short lCSHIFT = c->CSHIFT; \
318  \
319  const ubyte *y1i = in[0]; \
320  const ubyte *y2i = in[0] + instrides[0]; \
321  const ubyte *ui = in[1]; \
322  const ubyte *vi = in[2]; \
323  \
324  vector unsigned char *oute, *outo; \
325  \
326  /* loop moves y{1, 2}i by w */ \
327  instrides_scl[0] = instrides[0] * 2 - w; \
328  /* loop moves ui by w / 2 */ \
329  instrides_scl[1] = instrides[1] - w / 2; \
330  /* loop moves vi by w / 2 */ \
331  instrides_scl[2] = instrides[2] - w / 2; \
332  \
333  for (i = 0; i < h / 2; i++) { \
334  oute = (vector unsigned char *)(oplanes[0] + outstrides[0] * \
335  (srcSliceY + i * 2)); \
336  outo = oute + (outstrides[0] >> 4); \
337  vec_dstst(outo, (0x02000002 | (((w * 3 + 32) / 32) << 16)), 0); \
338  vec_dstst(oute, (0x02000002 | (((w * 3 + 32) / 32) << 16)), 1); \
339  \
340  for (j = 0; j < w / 16; j++) { \
341  y1ivP = (const vector unsigned char *) y1i; \
342  y2ivP = (const vector unsigned char *) y2i; \
343  uivP = (const vector unsigned char *) ui; \
344  vivP = (const vector unsigned char *) vi; \
345  \
346  align_perm = vec_lvsl(0, y1i); \
347  y0 = (vector unsigned char) \
348  vec_perm(y1ivP[0], y1ivP[1], align_perm); \
349  \
350  align_perm = vec_lvsl(0, y2i); \
351  y1 = (vector unsigned char) \
352  vec_perm(y2ivP[0], y2ivP[1], align_perm); \
353  \
354  align_perm = vec_lvsl(0, ui); \
355  u = (vector signed char) \
356  vec_perm(uivP[0], uivP[1], align_perm); \
357  \
358  align_perm = vec_lvsl(0, vi); \
359  v = (vector signed char) \
360  vec_perm(vivP[0], vivP[1], align_perm); \
361  \
362  u = (vector signed char) \
363  vec_sub(u, \
364  (vector signed char) \
365  vec_splat((vector signed char) { 128 }, 0)); \
366  v = (vector signed char) \
367  vec_sub(v, \
368  (vector signed char) \
369  vec_splat((vector signed char) { 128 }, 0)); \
370  \
371  U = vec_unpackh(u); \
372  V = vec_unpackh(v); \
373  \
374  Y0 = vec_unh(y0); \
375  Y1 = vec_unl(y0); \
376  Y2 = vec_unh(y1); \
377  Y3 = vec_unl(y1); \
378  \
379  Y0 = vec_mradds(Y0, lCY, lOY); \
380  Y1 = vec_mradds(Y1, lCY, lOY); \
381  Y2 = vec_mradds(Y2, lCY, lOY); \
382  Y3 = vec_mradds(Y3, lCY, lOY); \
383  \
384  /* ux = (CBU * (u << CSHIFT) + 0x4000) >> 15 */ \
385  ux = vec_sl(U, lCSHIFT); \
386  ux = vec_mradds(ux, lCBU, (vector signed short) { 0 }); \
387  ux0 = vec_mergeh(ux, ux); \
388  ux1 = vec_mergel(ux, ux); \
389  \
390  /* vx = (CRV * (v << CSHIFT) + 0x4000) >> 15; */ \
391  vx = vec_sl(V, lCSHIFT); \
392  vx = vec_mradds(vx, lCRV, (vector signed short) { 0 }); \
393  vx0 = vec_mergeh(vx, vx); \
394  vx1 = vec_mergel(vx, vx); \
395  \
396  /* uvx = ((CGU * u) + (CGV * v)) >> 15 */ \
397  uvx = vec_mradds(U, lCGU, (vector signed short) { 0 }); \
398  uvx = vec_mradds(V, lCGV, uvx); \
399  uvx0 = vec_mergeh(uvx, uvx); \
400  uvx1 = vec_mergel(uvx, uvx); \
401  \
402  R0 = vec_add(Y0, vx0); \
403  G0 = vec_add(Y0, uvx0); \
404  B0 = vec_add(Y0, ux0); \
405  R1 = vec_add(Y1, vx1); \
406  G1 = vec_add(Y1, uvx1); \
407  B1 = vec_add(Y1, ux1); \
408  \
409  R = vec_packclp(R0, R1); \
410  G = vec_packclp(G0, G1); \
411  B = vec_packclp(B0, B1); \
412  \
413  out_pixels(R, G, B, oute); \
414  \
415  R0 = vec_add(Y2, vx0); \
416  G0 = vec_add(Y2, uvx0); \
417  B0 = vec_add(Y2, ux0); \
418  R1 = vec_add(Y3, vx1); \
419  G1 = vec_add(Y3, uvx1); \
420  B1 = vec_add(Y3, ux1); \
421  R = vec_packclp(R0, R1); \
422  G = vec_packclp(G0, G1); \
423  B = vec_packclp(B0, B1); \
424  \
425  \
426  out_pixels(R, G, B, outo); \
427  \
428  y1i += 16; \
429  y2i += 16; \
430  ui += 8; \
431  vi += 8; \
432  } \
433  \
434  ui += instrides_scl[1]; \
435  vi += instrides_scl[2]; \
436  y1i += instrides_scl[0]; \
437  y2i += instrides_scl[0]; \
438  } \
439  return srcSliceH; \
440 }
441 
442 #define out_abgr(a, b, c, ptr) \
443  vec_mstrgb32(__typeof__(a), ((__typeof__(a)) { 255 }), c, b, a, ptr)
444 #define out_bgra(a, b, c, ptr) \
445  vec_mstrgb32(__typeof__(a), c, b, a, ((__typeof__(a)) { 255 }), ptr)
446 #define out_rgba(a, b, c, ptr) \
447  vec_mstrgb32(__typeof__(a), a, b, c, ((__typeof__(a)) { 255 }), ptr)
448 #define out_argb(a, b, c, ptr) \
449  vec_mstrgb32(__typeof__(a), ((__typeof__(a)) { 255 }), a, b, c, ptr)
450 #define out_rgb24(a, b, c, ptr) vec_mstrgb24(a, b, c, ptr)
451 #define out_bgr24(a, b, c, ptr) vec_mstbgr24(a, b, c, ptr)
452 
453 DEFCSP420_CVT(yuv2_abgr, out_abgr)
454 DEFCSP420_CVT(yuv2_bgra, out_bgra)
455 DEFCSP420_CVT(yuv2_rgba, out_rgba)
456 DEFCSP420_CVT(yuv2_argb, out_argb)
457 DEFCSP420_CVT(yuv2_rgb24, out_rgb24)
458 DEFCSP420_CVT(yuv2_bgr24, out_bgr24)
459 
460 // uyvy|uyvy|uyvy|uyvy
461 // 0123 4567 89ab cdef
462 static const vector unsigned char
463  demux_u = { 0x10, 0x00, 0x10, 0x00,
464  0x10, 0x04, 0x10, 0x04,
465  0x10, 0x08, 0x10, 0x08,
466  0x10, 0x0c, 0x10, 0x0c },
467  demux_v = { 0x10, 0x02, 0x10, 0x02,
468  0x10, 0x06, 0x10, 0x06,
469  0x10, 0x0A, 0x10, 0x0A,
470  0x10, 0x0E, 0x10, 0x0E },
471  demux_y = { 0x10, 0x01, 0x10, 0x03,
472  0x10, 0x05, 0x10, 0x07,
473  0x10, 0x09, 0x10, 0x0B,
474  0x10, 0x0D, 0x10, 0x0F };
475 
476 /*
477  * this is so I can play live CCIR raw video
478  */
479 static int altivec_uyvy_rgb32(SwsContext *c, const unsigned char **in,
480  int *instrides, int srcSliceY, int srcSliceH,
481  unsigned char **oplanes, int *outstrides)
482 {
483  int w = c->srcW;
484  int h = srcSliceH;
485  int i, j;
486  vector unsigned char uyvy;
487  vector signed short Y, U, V;
488  vector signed short R0, G0, B0, R1, G1, B1;
489  vector unsigned char R, G, B;
490  vector unsigned char *out;
491  const ubyte *img;
492 
493  img = in[0];
494  out = (vector unsigned char *) (oplanes[0] + srcSliceY * outstrides[0]);
495 
496  for (i = 0; i < h; i++)
497  for (j = 0; j < w / 16; j++) {
498  uyvy = vec_ld(0, img);
499 
500  U = (vector signed short)
501  vec_perm(uyvy, (vector unsigned char) { 0 }, demux_u);
502  V = (vector signed short)
503  vec_perm(uyvy, (vector unsigned char) { 0 }, demux_v);
504  Y = (vector signed short)
505  vec_perm(uyvy, (vector unsigned char) { 0 }, demux_y);
506 
507  cvtyuvtoRGB(c, Y, U, V, &R0, &G0, &B0);
508 
509  uyvy = vec_ld(16, img);
510 
511  U = (vector signed short)
512  vec_perm(uyvy, (vector unsigned char) { 0 }, demux_u);
513  V = (vector signed short)
514  vec_perm(uyvy, (vector unsigned char) { 0 }, demux_v);
515  Y = (vector signed short)
516  vec_perm(uyvy, (vector unsigned char) { 0 }, demux_y);
517 
518  cvtyuvtoRGB(c, Y, U, V, &R1, &G1, &B1);
519 
520  R = vec_packclp(R0, R1);
521  G = vec_packclp(G0, G1);
522  B = vec_packclp(B0, B1);
523 
524  // vec_mstbgr24 (R,G,B, out);
525  out_rgba(R, G, B, out);
526 
527  img += 32;
528  }
529  return srcSliceH;
530 }
531 
532 #endif /* HAVE_ALTIVEC */
533 
534 /* Ok currently the acceleration routine only supports
535  * inputs of widths a multiple of 16
536  * and heights a multiple 2
537  *
538  * So we just fall back to the C codes for this.
539  */
540 av_cold SwsFunc ff_yuv2rgb_init_ppc(SwsContext *c)
541 {
542 #if HAVE_ALTIVEC
543  if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
544  return NULL;
545 
546  /*
547  * and this seems not to matter too much I tried a bunch of
548  * videos with abnormal widths and MPlayer crashes elsewhere.
549  * mplayer -vo x11 -rawvideo on:w=350:h=240 raw-350x240.eyuv
550  * boom with X11 bad match.
551  *
552  */
553  if ((c->srcW & 0xf) != 0)
554  return NULL;
555 
556  switch (c->srcFormat) {
557  case AV_PIX_FMT_YUV410P:
558  case AV_PIX_FMT_YUV420P:
559  /*case IMGFMT_CLPL: ??? */
560  case AV_PIX_FMT_GRAY8:
561  case AV_PIX_FMT_NV12:
562  case AV_PIX_FMT_NV21:
563  if ((c->srcH & 0x1) != 0)
564  return NULL;
565 
566  switch (c->dstFormat) {
567  case AV_PIX_FMT_RGB24:
568  av_log(c, AV_LOG_WARNING, "ALTIVEC: Color Space RGB24\n");
569  return altivec_yuv2_rgb24;
570  case AV_PIX_FMT_BGR24:
571  av_log(c, AV_LOG_WARNING, "ALTIVEC: Color Space BGR24\n");
572  return altivec_yuv2_bgr24;
573  case AV_PIX_FMT_ARGB:
574  av_log(c, AV_LOG_WARNING, "ALTIVEC: Color Space ARGB\n");
575  return altivec_yuv2_argb;
576  case AV_PIX_FMT_ABGR:
577  av_log(c, AV_LOG_WARNING, "ALTIVEC: Color Space ABGR\n");
578  return altivec_yuv2_abgr;
579  case AV_PIX_FMT_RGBA:
580  av_log(c, AV_LOG_WARNING, "ALTIVEC: Color Space RGBA\n");
581  return altivec_yuv2_rgba;
582  case AV_PIX_FMT_BGRA:
583  av_log(c, AV_LOG_WARNING, "ALTIVEC: Color Space BGRA\n");
584  return altivec_yuv2_bgra;
585  default: return NULL;
586  }
587  break;
588 
589  case AV_PIX_FMT_UYVY422:
590  switch (c->dstFormat) {
591  case AV_PIX_FMT_BGR32:
592  av_log(c, AV_LOG_WARNING, "ALTIVEC: Color Space UYVY -> RGB32\n");
593  return altivec_uyvy_rgb32;
594  default: return NULL;
595  }
596  break;
597  }
598 #endif /* HAVE_ALTIVEC */
599 
600  return NULL;
601 }
602 
603 av_cold void ff_yuv2rgb_init_tables_ppc(SwsContext *c,
604  const int inv_table[4],
605  int brightness,
606  int contrast,
607  int saturation)
608 {
609 #if HAVE_ALTIVEC
610  union {
611  DECLARE_ALIGNED(16, signed short, tmp)[8];
612  vector signed short vec;
613  } buf;
614 
615  if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
616  return;
617 
618  buf.tmp[0] = ((0xffffLL) * contrast >> 8) >> 9; // cy
619  buf.tmp[1] = -256 * brightness; // oy
620  buf.tmp[2] = (inv_table[0] >> 3) * (contrast >> 16) * (saturation >> 16); // crv
621  buf.tmp[3] = (inv_table[1] >> 3) * (contrast >> 16) * (saturation >> 16); // cbu
622  buf.tmp[4] = -((inv_table[2] >> 1) * (contrast >> 16) * (saturation >> 16)); // cgu
623  buf.tmp[5] = -((inv_table[3] >> 1) * (contrast >> 16) * (saturation >> 16)); // cgv
624 
625  c->CSHIFT = (vector unsigned short) vec_splat_u16(2);
626  c->CY = vec_splat((vector signed short) buf.vec, 0);
627  c->OY = vec_splat((vector signed short) buf.vec, 1);
628  c->CRV = vec_splat((vector signed short) buf.vec, 2);
629  c->CBU = vec_splat((vector signed short) buf.vec, 3);
630  c->CGU = vec_splat((vector signed short) buf.vec, 4);
631  c->CGV = vec_splat((vector signed short) buf.vec, 5);
632  return;
633 #endif /* HAVE_ALTIVEC */
634 }
635 
636 #if HAVE_ALTIVEC
637 
638 static av_always_inline void yuv2packedX_altivec(SwsContext *c,
639  const int16_t *lumFilter,
640  const int16_t **lumSrc,
641  int lumFilterSize,
642  const int16_t *chrFilter,
643  const int16_t **chrUSrc,
644  const int16_t **chrVSrc,
645  int chrFilterSize,
646  const int16_t **alpSrc,
647  uint8_t *dest,
648  int dstW, int dstY,
649  enum AVPixelFormat target)
650 {
651  int i, j;
652  vector signed short X, X0, X1, Y0, U0, V0, Y1, U1, V1, U, V;
653  vector signed short R0, G0, B0, R1, G1, B1;
654 
655  vector unsigned char R, G, B;
656  vector unsigned char *out, *nout;
657 
658  vector signed short RND = vec_splat_s16(1 << 3);
659  vector unsigned short SCL = vec_splat_u16(4);
660  DECLARE_ALIGNED(16, unsigned int, scratch)[16];
661 
662  vector signed short *YCoeffs, *CCoeffs;
663 
664  YCoeffs = c->vYCoeffsBank + dstY * lumFilterSize;
665  CCoeffs = c->vCCoeffsBank + dstY * chrFilterSize;
666 
667  out = (vector unsigned char *) dest;
668 
669  for (i = 0; i < dstW; i += 16) {
670  Y0 = RND;
671  Y1 = RND;
672  /* extract 16 coeffs from lumSrc */
673  for (j = 0; j < lumFilterSize; j++) {
674  X0 = vec_ld(0, &lumSrc[j][i]);
675  X1 = vec_ld(16, &lumSrc[j][i]);
676  Y0 = vec_mradds(X0, YCoeffs[j], Y0);
677  Y1 = vec_mradds(X1, YCoeffs[j], Y1);
678  }
679 
680  U = RND;
681  V = RND;
682  /* extract 8 coeffs from U,V */
683  for (j = 0; j < chrFilterSize; j++) {
684  X = vec_ld(0, &chrUSrc[j][i / 2]);
685  U = vec_mradds(X, CCoeffs[j], U);
686  X = vec_ld(0, &chrVSrc[j][i / 2]);
687  V = vec_mradds(X, CCoeffs[j], V);
688  }
689 
690  /* scale and clip signals */
691  Y0 = vec_sra(Y0, SCL);
692  Y1 = vec_sra(Y1, SCL);
693  U = vec_sra(U, SCL);
694  V = vec_sra(V, SCL);
695 
696  Y0 = vec_clip_s16(Y0);
697  Y1 = vec_clip_s16(Y1);
698  U = vec_clip_s16(U);
699  V = vec_clip_s16(V);
700 
701  /* now we have
702  * Y0 = y0 y1 y2 y3 y4 y5 y6 y7 Y1 = y8 y9 y10 y11 y12 y13 y14 y15
703  * U = u0 u1 u2 u3 u4 u5 u6 u7 V = v0 v1 v2 v3 v4 v5 v6 v7
704  *
705  * Y0 = y0 y1 y2 y3 y4 y5 y6 y7 Y1 = y8 y9 y10 y11 y12 y13 y14 y15
706  * U0 = u0 u0 u1 u1 u2 u2 u3 u3 U1 = u4 u4 u5 u5 u6 u6 u7 u7
707  * V0 = v0 v0 v1 v1 v2 v2 v3 v3 V1 = v4 v4 v5 v5 v6 v6 v7 v7
708  */
709 
710  U0 = vec_mergeh(U, U);
711  V0 = vec_mergeh(V, V);
712 
713  U1 = vec_mergel(U, U);
714  V1 = vec_mergel(V, V);
715 
716  cvtyuvtoRGB(c, Y0, U0, V0, &R0, &G0, &B0);
717  cvtyuvtoRGB(c, Y1, U1, V1, &R1, &G1, &B1);
718 
719  R = vec_packclp(R0, R1);
720  G = vec_packclp(G0, G1);
721  B = vec_packclp(B0, B1);
722 
723  switch (target) {
724  case AV_PIX_FMT_ABGR:
725  out_abgr(R, G, B, out);
726  break;
727  case AV_PIX_FMT_BGRA:
728  out_bgra(R, G, B, out);
729  break;
730  case AV_PIX_FMT_RGBA:
731  out_rgba(R, G, B, out);
732  break;
733  case AV_PIX_FMT_ARGB:
734  out_argb(R, G, B, out);
735  break;
736  case AV_PIX_FMT_RGB24:
737  out_rgb24(R, G, B, out);
738  break;
739  case AV_PIX_FMT_BGR24:
740  out_bgr24(R, G, B, out);
741  break;
742  default:
743  {
744  /* If this is reached, the caller should have called yuv2packedXinC
745  * instead. */
746  static int printed_error_message;
747  if (!printed_error_message) {
748  av_log(c, AV_LOG_ERROR,
749  "altivec_yuv2packedX doesn't support %s output\n",
750  av_get_pix_fmt_name(c->dstFormat));
751  printed_error_message = 1;
752  }
753  return;
754  }
755  }
756  }
757 
758  if (i < dstW) {
759  i -= 16;
760 
761  Y0 = RND;
762  Y1 = RND;
763  /* extract 16 coeffs from lumSrc */
764  for (j = 0; j < lumFilterSize; j++) {
765  X0 = vec_ld(0, &lumSrc[j][i]);
766  X1 = vec_ld(16, &lumSrc[j][i]);
767  Y0 = vec_mradds(X0, YCoeffs[j], Y0);
768  Y1 = vec_mradds(X1, YCoeffs[j], Y1);
769  }
770 
771  U = RND;
772  V = RND;
773  /* extract 8 coeffs from U,V */
774  for (j = 0; j < chrFilterSize; j++) {
775  X = vec_ld(0, &chrUSrc[j][i / 2]);
776  U = vec_mradds(X, CCoeffs[j], U);
777  X = vec_ld(0, &chrVSrc[j][i / 2]);
778  V = vec_mradds(X, CCoeffs[j], V);
779  }
780 
781  /* scale and clip signals */
782  Y0 = vec_sra(Y0, SCL);
783  Y1 = vec_sra(Y1, SCL);
784  U = vec_sra(U, SCL);
785  V = vec_sra(V, SCL);
786 
787  Y0 = vec_clip_s16(Y0);
788  Y1 = vec_clip_s16(Y1);
789  U = vec_clip_s16(U);
790  V = vec_clip_s16(V);
791 
792  /* now we have
793  * Y0 = y0 y1 y2 y3 y4 y5 y6 y7 Y1 = y8 y9 y10 y11 y12 y13 y14 y15
794  * U = u0 u1 u2 u3 u4 u5 u6 u7 V = v0 v1 v2 v3 v4 v5 v6 v7
795  *
796  * Y0 = y0 y1 y2 y3 y4 y5 y6 y7 Y1 = y8 y9 y10 y11 y12 y13 y14 y15
797  * U0 = u0 u0 u1 u1 u2 u2 u3 u3 U1 = u4 u4 u5 u5 u6 u6 u7 u7
798  * V0 = v0 v0 v1 v1 v2 v2 v3 v3 V1 = v4 v4 v5 v5 v6 v6 v7 v7
799  */
800 
801  U0 = vec_mergeh(U, U);
802  V0 = vec_mergeh(V, V);
803 
804  U1 = vec_mergel(U, U);
805  V1 = vec_mergel(V, V);
806 
807  cvtyuvtoRGB(c, Y0, U0, V0, &R0, &G0, &B0);
808  cvtyuvtoRGB(c, Y1, U1, V1, &R1, &G1, &B1);
809 
810  R = vec_packclp(R0, R1);
811  G = vec_packclp(G0, G1);
812  B = vec_packclp(B0, B1);
813 
814  nout = (vector unsigned char *) scratch;
815  switch (target) {
816  case AV_PIX_FMT_ABGR:
817  out_abgr(R, G, B, nout);
818  break;
819  case AV_PIX_FMT_BGRA:
820  out_bgra(R, G, B, nout);
821  break;
822  case AV_PIX_FMT_RGBA:
823  out_rgba(R, G, B, nout);
824  break;
825  case AV_PIX_FMT_ARGB:
826  out_argb(R, G, B, nout);
827  break;
828  case AV_PIX_FMT_RGB24:
829  out_rgb24(R, G, B, nout);
830  break;
831  case AV_PIX_FMT_BGR24:
832  out_bgr24(R, G, B, nout);
833  break;
834  default:
835  /* Unreachable, I think. */
836  av_log(c, AV_LOG_ERROR,
837  "altivec_yuv2packedX doesn't support %s output\n",
838  av_get_pix_fmt_name(c->dstFormat));
839  return;
840  }
841 
842  memcpy(&((uint32_t *) dest)[i], scratch, (dstW - i) / 4);
843  }
844 }
845 
846 #define YUV2PACKEDX_WRAPPER(suffix, pixfmt) \
847 void ff_yuv2 ## suffix ## _X_altivec(SwsContext *c, \
848  const int16_t *lumFilter, \
849  const int16_t **lumSrc, \
850  int lumFilterSize, \
851  const int16_t *chrFilter, \
852  const int16_t **chrUSrc, \
853  const int16_t **chrVSrc, \
854  int chrFilterSize, \
855  const int16_t **alpSrc, \
856  uint8_t *dest, int dstW, int dstY) \
857 { \
858  yuv2packedX_altivec(c, lumFilter, lumSrc, lumFilterSize, \
859  chrFilter, chrUSrc, chrVSrc, \
860  chrFilterSize, alpSrc, \
861  dest, dstW, dstY, pixfmt); \
862 }
863 
864 YUV2PACKEDX_WRAPPER(abgr, AV_PIX_FMT_ABGR);
865 YUV2PACKEDX_WRAPPER(bgra, AV_PIX_FMT_BGRA);
866 YUV2PACKEDX_WRAPPER(argb, AV_PIX_FMT_ARGB);
867 YUV2PACKEDX_WRAPPER(rgba, AV_PIX_FMT_RGBA);
868 YUV2PACKEDX_WRAPPER(rgb24, AV_PIX_FMT_RGB24);
869 YUV2PACKEDX_WRAPPER(bgr24, AV_PIX_FMT_BGR24);
870 
871 #endif /* HAVE_ALTIVEC */
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
B1
#define B1
Definition: faandct.c:41
out
FILE * out
Definition: movenc.c:54
AV_PIX_FMT_BGR32
#define AV_PIX_FMT_BGR32
Definition: pixfmt.h:362
R0
#define R0(v, w, x, y, z, i)
Definition: sha.c:56
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:26
pixdesc.h
w
uint8_t w
Definition: llviddspenc.c:38
R
#define R
Definition: huffyuvdsp.h:34
B0
#define B0
Definition: faandct.c:40
AV_PIX_FMT_BGR24
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
AV_PIX_FMT_BGRA
@ AV_PIX_FMT_BGRA
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:95
R1
#define R1
Definition: simple_idct.c:172
av_get_cpu_flags
int av_get_cpu_flags(void)
Return the flags which specify extensions supported by the CPU.
Definition: cpu.c:93
SwsFunc
int(* SwsFunc)(struct SwsContext *context, const uint8_t *src[], int srcStride[], int srcSliceY, int srcSliceH, uint8_t *dst[], int dstStride[])
Definition: swscale_internal.h:82
U
#define U(x)
Definition: vp56_arith.h:37
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
buf
void * buf
Definition: avisynth_c.h:766
av_cold
#define av_cold
Definition: attributes.h:84
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
AV_PIX_FMT_RGBA
@ AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
NULL
#define NULL
Definition: coverity.c:32
V
#define V
Definition: avdct.c:30
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
AV_CPU_FLAG_ALTIVEC
#define AV_CPU_FLAG_ALTIVEC
standard
Definition: cpu.h:60
AV_PIX_FMT_ABGR
@ AV_PIX_FMT_ABGR
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:94
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
AV_PIX_FMT_RGB24
@ AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
cpu.h
img
#define img
Definition: vf_colormatrix.c:116
yuv2rgb_altivec.h
attributes.h
ff_yuv2rgb_init_ppc
av_cold SwsFunc ff_yuv2rgb_init_ppc(SwsContext *c)
Definition: yuv2rgb_altivec.c:540
Y
#define Y
Definition: boxblur.h:38
AV_PIX_FMT_ARGB
@ AV_PIX_FMT_ARGB
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:92
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:112
in
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method !=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2) { ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc) { av_free(ac);return NULL;} return ac;} in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar) { ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar ? ac->channels :1;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
Definition: audio_convert.c:326
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
xf
#define xf(width, name, var, range_min, range_max, subs,...)
Definition: cbs_av1.c:668
av_always_inline
#define av_always_inline
Definition: attributes.h:43
swscale_internal.h
uint8_t
uint8_t
Definition: audio_convert.c:194
AV_PIX_FMT_NV21
@ AV_PIX_FMT_NV21
as above, but U and V bytes are swapped
Definition: pixfmt.h:90
G
#define G
Definition: huffyuvdsp.h:33
AV_PIX_FMT_NV12
@ AV_PIX_FMT_NV12
planar YUV 4:2:0, 12bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (firs...
Definition: pixfmt.h:89
AV_PIX_FMT_UYVY422
@ AV_PIX_FMT_UYVY422
packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1
Definition: pixfmt.h:81
B
#define B
Definition: huffyuvdsp.h:32
config.h
ff_yuv2rgb_init_tables_ppc
av_cold void ff_yuv2rgb_init_tables_ppc(SwsContext *c, const int inv_table[4], int brightness, int contrast, int saturation)
Definition: yuv2rgb_altivec.c:603
AV_PIX_FMT_YUV410P
@ AV_PIX_FMT_YUV410P
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:72
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
h
h
Definition: vp9dsp_template.c:2038
SwsContext
Definition: swscale_internal.h:280
short
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option keep it simple and lowercase description are short
Definition: writing_filters.txt:89
rgb2rgb.h
swscale.h
av_get_pix_fmt_name
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:2438
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