1 /*
2 * Copyright (c) 2013 Stefano Sabatini
3 * Copyright (c) 2008 Vitor Sessak
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * rotation filter, partially based on the tests/rotozoom.c program
25 */
26
27 #include "libavutil/avstring.h"
28 #include "libavutil/eval.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/parseutils.h"
32 #include "libavutil/pixdesc.h"
33
34 #include "avfilter.h"
35 #include "drawutils.h"
36 #include "internal.h"
37 #include "video.h"
38
39 #include <float.h>
40
41 static const char * const var_names[] = {
42 "in_w" , "iw", ///< width of the input video
43 "in_h" , "ih", ///< height of the input video
44 "out_w", "ow", ///< width of the input video
45 "out_h", "oh", ///< height of the input video
46 "hsub", "vsub",
47 "n", ///< number of frame
48 "t", ///< timestamp expressed in seconds
49 NULL
50 };
51
52 enum var_name {
53 VAR_IN_W , VAR_IW,
54 VAR_IN_H , VAR_IH,
55 VAR_OUT_W, VAR_OW,
56 VAR_OUT_H, VAR_OH,
57 VAR_HSUB, VAR_VSUB,
58 VAR_N,
59 VAR_T,
60 VAR_VARS_NB
61 };
62
63 typedef struct RotContext {
64 const AVClass *class;
65 double angle;
66 char *angle_expr_str; ///< expression for the angle
67 AVExpr *angle_expr; ///< parsed expression for the angle
68 char *outw_expr_str, *outh_expr_str;
69 int outh, outw;
70 uint8_t fillcolor[4]; ///< color expressed either in YUVA or RGBA colorspace for the padding area
71 char *fillcolor_str;
72 int fillcolor_enable;
73 int hsub, vsub;
74 int nb_planes;
75 int use_bilinear;
76 float sinx, cosx;
77 double var_values[VAR_VARS_NB];
78 FFDrawContext draw;
79 FFDrawColor color;
80 uint8_t *(*interpolate_bilinear)(uint8_t *dst_color,
81 const uint8_t *src, int src_linesize, int src_linestep,
82 int x, int y, int max_x, int max_y);
83 } RotContext;
84
85 typedef struct ThreadData {
86 AVFrame *in, *out;
87 int inw, inh;
88 int outw, outh;
89 int plane;
90 int xi, yi;
91 int xprime, yprime;
92 int c, s;
93 } ThreadData;
94
95 #define OFFSET(x) offsetof(RotContext, x)
96 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
97 #define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
98
99 static const AVOption rotate_options[] = {
100 { "angle", "set angle (in radians)", OFFSET(angle_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags=TFLAGS },
101 { "a", "set angle (in radians)", OFFSET(angle_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, .flags=TFLAGS },
102 { "out_w", "set output width expression", OFFSET(outw_expr_str), AV_OPT_TYPE_STRING, {.str="iw"}, 0, 0, .flags=FLAGS },
103 { "ow", "set output width expression", OFFSET(outw_expr_str), AV_OPT_TYPE_STRING, {.str="iw"}, 0, 0, .flags=FLAGS },
104 { "out_h", "set output height expression", OFFSET(outh_expr_str), AV_OPT_TYPE_STRING, {.str="ih"}, 0, 0, .flags=FLAGS },
105 { "oh", "set output height expression", OFFSET(outh_expr_str), AV_OPT_TYPE_STRING, {.str="ih"}, 0, 0, .flags=FLAGS },
106 { "fillcolor", "set background fill color", OFFSET(fillcolor_str), AV_OPT_TYPE_STRING, {.str="black"}, 0, 0, .flags=FLAGS },
107 { "c", "set background fill color", OFFSET(fillcolor_str), AV_OPT_TYPE_STRING, {.str="black"}, 0, 0, .flags=FLAGS },
108 { "bilinear", "use bilinear interpolation", OFFSET(use_bilinear), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, .flags=FLAGS },
109 { NULL }
110 };
111
112 AVFILTER_DEFINE_CLASS(rotate);
113
init(AVFilterContext * ctx)114 static av_cold int init(AVFilterContext *ctx)
115 {
116 RotContext *rot = ctx->priv;
117
118 if (!strcmp(rot->fillcolor_str, "none"))
119 rot->fillcolor_enable = 0;
120 else if (av_parse_color(rot->fillcolor, rot->fillcolor_str, -1, ctx) >= 0)
121 rot->fillcolor_enable = 1;
122 else
123 return AVERROR(EINVAL);
124 return 0;
125 }
126
uninit(AVFilterContext * ctx)127 static av_cold void uninit(AVFilterContext *ctx)
128 {
129 RotContext *rot = ctx->priv;
130
131 av_expr_free(rot->angle_expr);
132 rot->angle_expr = NULL;
133 }
134
135 static const enum AVPixelFormat pix_fmts[] = {
136 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
137 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
138 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
139 AV_PIX_FMT_0RGB, AV_PIX_FMT_RGB0,
140 AV_PIX_FMT_0BGR, AV_PIX_FMT_BGR0,
141 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
142 AV_PIX_FMT_GRAY8,
143 AV_PIX_FMT_YUV410P,
144 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
145 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
146 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA420P,
147 AV_PIX_FMT_YUV420P10LE, AV_PIX_FMT_YUVA420P10LE,
148 AV_PIX_FMT_YUV444P10LE, AV_PIX_FMT_YUVA444P10LE,
149 AV_PIX_FMT_YUV420P12LE,
150 AV_PIX_FMT_YUV444P12LE,
151 AV_PIX_FMT_YUV444P16LE, AV_PIX_FMT_YUVA444P16LE,
152 AV_PIX_FMT_YUV420P16LE, AV_PIX_FMT_YUVA420P16LE,
153 AV_PIX_FMT_YUV444P9LE, AV_PIX_FMT_YUVA444P9LE,
154 AV_PIX_FMT_YUV420P9LE, AV_PIX_FMT_YUVA420P9LE,
155 AV_PIX_FMT_NONE
156 };
157
get_rotated_w(void * opaque,double angle)158 static double get_rotated_w(void *opaque, double angle)
159 {
160 RotContext *rot = opaque;
161 double inw = rot->var_values[VAR_IN_W];
162 double inh = rot->var_values[VAR_IN_H];
163 float sinx = sin(angle);
164 float cosx = cos(angle);
165
166 return FFMAX(0, inh * sinx) + FFMAX(0, -inw * cosx) +
167 FFMAX(0, inw * cosx) + FFMAX(0, -inh * sinx);
168 }
169
get_rotated_h(void * opaque,double angle)170 static double get_rotated_h(void *opaque, double angle)
171 {
172 RotContext *rot = opaque;
173 double inw = rot->var_values[VAR_IN_W];
174 double inh = rot->var_values[VAR_IN_H];
175 float sinx = sin(angle);
176 float cosx = cos(angle);
177
178 return FFMAX(0, -inh * cosx) + FFMAX(0, -inw * sinx) +
179 FFMAX(0, inh * cosx) + FFMAX(0, inw * sinx);
180 }
181
182 static double (* const func1[])(void *, double) = {
183 get_rotated_w,
184 get_rotated_h,
185 NULL
186 };
187
188 static const char * const func1_names[] = {
189 "rotw",
190 "roth",
191 NULL
192 };
193
194 #define FIXP (1<<16)
195 #define FIXP2 (1<<20)
196 #define INT_PI 3294199 //(M_PI * FIXP2)
197
198 /**
199 * Compute the sin of a using integer values.
200 * Input is scaled by FIXP2 and output values are scaled by FIXP.
201 */
int_sin(int64_t a)202 static int64_t int_sin(int64_t a)
203 {
204 int64_t a2, res = 0;
205 int i;
206 if (a < 0) a = INT_PI-a; // 0..inf
207 a %= 2 * INT_PI; // 0..2PI
208
209 if (a >= INT_PI*3/2) a -= 2*INT_PI; // -PI/2 .. 3PI/2
210 if (a >= INT_PI/2 ) a = INT_PI - a; // -PI/2 .. PI/2
211
212 /* compute sin using Taylor series approximated to the fifth term */
213 a2 = (a*a)/(FIXP2);
214 for (i = 2; i < 11; i += 2) {
215 res += a;
216 a = -a*a2 / (FIXP2*i*(i+1));
217 }
218 return (res + 8)>>4;
219 }
220
221 /**
222 * Interpolate the color in src at position x and y using bilinear
223 * interpolation.
224 */
interpolate_bilinear8(uint8_t * dst_color,const uint8_t * src,int src_linesize,int src_linestep,int x,int y,int max_x,int max_y)225 static uint8_t *interpolate_bilinear8(uint8_t *dst_color,
226 const uint8_t *src, int src_linesize, int src_linestep,
227 int x, int y, int max_x, int max_y)
228 {
229 int int_x = av_clip(x>>16, 0, max_x);
230 int int_y = av_clip(y>>16, 0, max_y);
231 int frac_x = x&0xFFFF;
232 int frac_y = y&0xFFFF;
233 int i;
234 int int_x1 = FFMIN(int_x+1, max_x);
235 int int_y1 = FFMIN(int_y+1, max_y);
236
237 for (i = 0; i < src_linestep; i++) {
238 int s00 = src[src_linestep * int_x + i + src_linesize * int_y ];
239 int s01 = src[src_linestep * int_x1 + i + src_linesize * int_y ];
240 int s10 = src[src_linestep * int_x + i + src_linesize * int_y1];
241 int s11 = src[src_linestep * int_x1 + i + src_linesize * int_y1];
242 int s0 = (((1<<16) - frac_x)*s00 + frac_x*s01);
243 int s1 = (((1<<16) - frac_x)*s10 + frac_x*s11);
244
245 dst_color[i] = ((int64_t)((1<<16) - frac_y)*s0 + (int64_t)frac_y*s1) >> 32;
246 }
247
248 return dst_color;
249 }
250
251 /**
252 * Interpolate the color in src at position x and y using bilinear
253 * interpolation.
254 */
interpolate_bilinear16(uint8_t * dst_color,const uint8_t * src,int src_linesize,int src_linestep,int x,int y,int max_x,int max_y)255 static uint8_t *interpolate_bilinear16(uint8_t *dst_color,
256 const uint8_t *src, int src_linesize, int src_linestep,
257 int x, int y, int max_x, int max_y)
258 {
259 int int_x = av_clip(x>>16, 0, max_x);
260 int int_y = av_clip(y>>16, 0, max_y);
261 int frac_x = x&0xFFFF;
262 int frac_y = y&0xFFFF;
263 int i;
264 int int_x1 = FFMIN(int_x+1, max_x);
265 int int_y1 = FFMIN(int_y+1, max_y);
266
267 for (i = 0; i < src_linestep; i+=2) {
268 int s00 = AV_RL16(&src[src_linestep * int_x + i + src_linesize * int_y ]);
269 int s01 = AV_RL16(&src[src_linestep * int_x1 + i + src_linesize * int_y ]);
270 int s10 = AV_RL16(&src[src_linestep * int_x + i + src_linesize * int_y1]);
271 int s11 = AV_RL16(&src[src_linestep * int_x1 + i + src_linesize * int_y1]);
272 int s0 = (((1<<16) - frac_x)*s00 + frac_x*s01);
273 int s1 = (((1<<16) - frac_x)*s10 + frac_x*s11);
274
275 AV_WL16(&dst_color[i], ((int64_t)((1<<16) - frac_y)*s0 + (int64_t)frac_y*s1) >> 32);
276 }
277
278 return dst_color;
279 }
280
config_props(AVFilterLink * outlink)281 static int config_props(AVFilterLink *outlink)
282 {
283 AVFilterContext *ctx = outlink->src;
284 RotContext *rot = ctx->priv;
285 AVFilterLink *inlink = ctx->inputs[0];
286 const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format);
287 int ret;
288 double res;
289 char *expr;
290
291 ret = ff_draw_init(&rot->draw, inlink->format, 0);
292 if (ret < 0)
293 return ret;
294 ff_draw_color(&rot->draw, &rot->color, rot->fillcolor);
295
296 rot->hsub = pixdesc->log2_chroma_w;
297 rot->vsub = pixdesc->log2_chroma_h;
298
299 if (pixdesc->comp[0].depth == 8)
300 rot->interpolate_bilinear = interpolate_bilinear8;
301 else
302 rot->interpolate_bilinear = interpolate_bilinear16;
303
304 rot->var_values[VAR_IN_W] = rot->var_values[VAR_IW] = inlink->w;
305 rot->var_values[VAR_IN_H] = rot->var_values[VAR_IH] = inlink->h;
306 rot->var_values[VAR_HSUB] = 1<<rot->hsub;
307 rot->var_values[VAR_VSUB] = 1<<rot->vsub;
308 rot->var_values[VAR_N] = NAN;
309 rot->var_values[VAR_T] = NAN;
310 rot->var_values[VAR_OUT_W] = rot->var_values[VAR_OW] = NAN;
311 rot->var_values[VAR_OUT_H] = rot->var_values[VAR_OH] = NAN;
312
313 av_expr_free(rot->angle_expr);
314 rot->angle_expr = NULL;
315 if ((ret = av_expr_parse(&rot->angle_expr, expr = rot->angle_expr_str, var_names,
316 func1_names, func1, NULL, NULL, 0, ctx)) < 0) {
317 av_log(ctx, AV_LOG_ERROR,
318 "Error occurred parsing angle expression '%s'\n", rot->angle_expr_str);
319 return ret;
320 }
321
322 #define SET_SIZE_EXPR(name, opt_name) do { \
323 ret = av_expr_parse_and_eval(&res, expr = rot->name##_expr_str, \
324 var_names, rot->var_values, \
325 func1_names, func1, NULL, NULL, rot, 0, ctx); \
326 if (ret < 0 || isnan(res) || isinf(res) || res <= 0) { \
327 av_log(ctx, AV_LOG_ERROR, \
328 "Error parsing or evaluating expression for option %s: " \
329 "invalid expression '%s' or non-positive or indefinite value %f\n", \
330 opt_name, expr, res); \
331 return ret; \
332 } \
333 } while (0)
334
335 /* evaluate width and height */
336 av_expr_parse_and_eval(&res, expr = rot->outw_expr_str, var_names, rot->var_values,
337 func1_names, func1, NULL, NULL, rot, 0, ctx);
338 rot->var_values[VAR_OUT_W] = rot->var_values[VAR_OW] = res;
339 rot->outw = res + 0.5;
340 SET_SIZE_EXPR(outh, "out_h");
341 rot->var_values[VAR_OUT_H] = rot->var_values[VAR_OH] = res;
342 rot->outh = res + 0.5;
343
344 /* evaluate the width again, as it may depend on the evaluated output height */
345 SET_SIZE_EXPR(outw, "out_w");
346 rot->var_values[VAR_OUT_W] = rot->var_values[VAR_OW] = res;
347 rot->outw = res + 0.5;
348
349 /* compute number of planes */
350 rot->nb_planes = av_pix_fmt_count_planes(inlink->format);
351 outlink->w = rot->outw;
352 outlink->h = rot->outh;
353 return 0;
354 }
355
copy_elem(uint8_t * pout,const uint8_t * pin,int elem_size)356 static av_always_inline void copy_elem(uint8_t *pout, const uint8_t *pin, int elem_size)
357 {
358 int v;
359 switch (elem_size) {
360 case 1:
361 *pout = *pin;
362 break;
363 case 2:
364 *((uint16_t *)pout) = *((uint16_t *)pin);
365 break;
366 case 3:
367 v = AV_RB24(pin);
368 AV_WB24(pout, v);
369 break;
370 case 4:
371 *((uint32_t *)pout) = *((uint32_t *)pin);
372 break;
373 default:
374 memcpy(pout, pin, elem_size);
375 break;
376 }
377 }
378
simple_rotate_internal(uint8_t * dst,const uint8_t * src,int src_linesize,int angle,int elem_size,int len)379 static av_always_inline void simple_rotate_internal(uint8_t *dst, const uint8_t *src, int src_linesize, int angle, int elem_size, int len)
380 {
381 int i;
382 switch(angle) {
383 case 0:
384 memcpy(dst, src, elem_size * len);
385 break;
386 case 1:
387 for (i = 0; i<len; i++)
388 copy_elem(dst + i*elem_size, src + (len-i-1)*src_linesize, elem_size);
389 break;
390 case 2:
391 for (i = 0; i<len; i++)
392 copy_elem(dst + i*elem_size, src + (len-i-1)*elem_size, elem_size);
393 break;
394 case 3:
395 for (i = 0; i<len; i++)
396 copy_elem(dst + i*elem_size, src + i*src_linesize, elem_size);
397 break;
398 }
399 }
400
simple_rotate(uint8_t * dst,const uint8_t * src,int src_linesize,int angle,int elem_size,int len)401 static av_always_inline void simple_rotate(uint8_t *dst, const uint8_t *src, int src_linesize, int angle, int elem_size, int len)
402 {
403 switch(elem_size) {
404 case 1 : simple_rotate_internal(dst, src, src_linesize, angle, 1, len); break;
405 case 2 : simple_rotate_internal(dst, src, src_linesize, angle, 2, len); break;
406 case 3 : simple_rotate_internal(dst, src, src_linesize, angle, 3, len); break;
407 case 4 : simple_rotate_internal(dst, src, src_linesize, angle, 4, len); break;
408 default: simple_rotate_internal(dst, src, src_linesize, angle, elem_size, len); break;
409 }
410 }
411
filter_slice(AVFilterContext * ctx,void * arg,int job,int nb_jobs)412 static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
413 {
414 ThreadData *td = arg;
415 AVFrame *in = td->in;
416 AVFrame *out = td->out;
417 RotContext *rot = ctx->priv;
418 const int outw = td->outw, outh = td->outh;
419 const int inw = td->inw, inh = td->inh;
420 const int plane = td->plane;
421 const int xi = td->xi, yi = td->yi;
422 const int c = td->c, s = td->s;
423 const int start = (outh * job ) / nb_jobs;
424 const int end = (outh * (job+1)) / nb_jobs;
425 int xprime = td->xprime + start * s;
426 int yprime = td->yprime + start * c;
427 int i, j, x, y;
428
429 for (j = start; j < end; j++) {
430 x = xprime + xi + FIXP*(inw-1)/2;
431 y = yprime + yi + FIXP*(inh-1)/2;
432
433 if (fabs(rot->angle - 0) < FLT_EPSILON && outw == inw && outh == inh) {
434 simple_rotate(out->data[plane] + j * out->linesize[plane],
435 in->data[plane] + j * in->linesize[plane],
436 in->linesize[plane], 0, rot->draw.pixelstep[plane], outw);
437 } else if (fabs(rot->angle - M_PI/2) < FLT_EPSILON && outw == inh && outh == inw) {
438 simple_rotate(out->data[plane] + j * out->linesize[plane],
439 in->data[plane] + j * rot->draw.pixelstep[plane],
440 in->linesize[plane], 1, rot->draw.pixelstep[plane], outw);
441 } else if (fabs(rot->angle - M_PI) < FLT_EPSILON && outw == inw && outh == inh) {
442 simple_rotate(out->data[plane] + j * out->linesize[plane],
443 in->data[plane] + (outh-j-1) * in->linesize[plane],
444 in->linesize[plane], 2, rot->draw.pixelstep[plane], outw);
445 } else if (fabs(rot->angle - 3*M_PI/2) < FLT_EPSILON && outw == inh && outh == inw) {
446 simple_rotate(out->data[plane] + j * out->linesize[plane],
447 in->data[plane] + (outh-j-1) * rot->draw.pixelstep[plane],
448 in->linesize[plane], 3, rot->draw.pixelstep[plane], outw);
449 } else {
450
451 for (i = 0; i < outw; i++) {
452 int32_t v;
453 int x1, y1;
454 uint8_t *pin, *pout;
455 x1 = x>>16;
456 y1 = y>>16;
457
458 /* the out-of-range values avoid border artifacts */
459 if (x1 >= -1 && x1 <= inw && y1 >= -1 && y1 <= inh) {
460 uint8_t inp_inv[4]; /* interpolated input value */
461 pout = out->data[plane] + j * out->linesize[plane] + i * rot->draw.pixelstep[plane];
462 if (rot->use_bilinear) {
463 pin = rot->interpolate_bilinear(inp_inv,
464 in->data[plane], in->linesize[plane], rot->draw.pixelstep[plane],
465 x, y, inw-1, inh-1);
466 } else {
467 int x2 = av_clip(x1, 0, inw-1);
468 int y2 = av_clip(y1, 0, inh-1);
469 pin = in->data[plane] + y2 * in->linesize[plane] + x2 * rot->draw.pixelstep[plane];
470 }
471 switch (rot->draw.pixelstep[plane]) {
472 case 1:
473 *pout = *pin;
474 break;
475 case 2:
476 v = AV_RL16(pin);
477 AV_WL16(pout, v);
478 break;
479 case 3:
480 v = AV_RB24(pin);
481 AV_WB24(pout, v);
482 break;
483 case 4:
484 *((uint32_t *)pout) = *((uint32_t *)pin);
485 break;
486 default:
487 memcpy(pout, pin, rot->draw.pixelstep[plane]);
488 break;
489 }
490 }
491 x += c;
492 y -= s;
493 }
494 }
495 xprime += s;
496 yprime += c;
497 }
498
499 return 0;
500 }
501
filter_frame(AVFilterLink * inlink,AVFrame * in)502 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
503 {
504 AVFilterContext *ctx = inlink->dst;
505 AVFilterLink *outlink = ctx->outputs[0];
506 AVFrame *out;
507 RotContext *rot = ctx->priv;
508 int angle_int, s, c, plane;
509 double res;
510
511 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
512 if (!out) {
513 av_frame_free(&in);
514 return AVERROR(ENOMEM);
515 }
516 av_frame_copy_props(out, in);
517
518 rot->var_values[VAR_N] = inlink->frame_count_out;
519 rot->var_values[VAR_T] = TS2T(in->pts, inlink->time_base);
520 rot->angle = res = av_expr_eval(rot->angle_expr, rot->var_values, rot);
521
522 av_log(ctx, AV_LOG_DEBUG, "n:%f time:%f angle:%f/PI\n",
523 rot->var_values[VAR_N], rot->var_values[VAR_T], rot->angle/M_PI);
524
525 angle_int = res * FIXP * 16;
526 s = int_sin(angle_int);
527 c = int_sin(angle_int + INT_PI/2);
528
529 /* fill background */
530 if (rot->fillcolor_enable)
531 ff_fill_rectangle(&rot->draw, &rot->color, out->data, out->linesize,
532 0, 0, outlink->w, outlink->h);
533
534 for (plane = 0; plane < rot->nb_planes; plane++) {
535 int hsub = plane == 1 || plane == 2 ? rot->hsub : 0;
536 int vsub = plane == 1 || plane == 2 ? rot->vsub : 0;
537 const int outw = AV_CEIL_RSHIFT(outlink->w, hsub);
538 const int outh = AV_CEIL_RSHIFT(outlink->h, vsub);
539 ThreadData td = { .in = in, .out = out,
540 .inw = AV_CEIL_RSHIFT(inlink->w, hsub),
541 .inh = AV_CEIL_RSHIFT(inlink->h, vsub),
542 .outh = outh, .outw = outw,
543 .xi = -(outw-1) * c / 2, .yi = (outw-1) * s / 2,
544 .xprime = -(outh-1) * s / 2,
545 .yprime = -(outh-1) * c / 2,
546 .plane = plane, .c = c, .s = s };
547
548 ff_filter_execute(ctx, filter_slice, &td, NULL,
549 FFMIN(outh, ff_filter_get_nb_threads(ctx)));
550 }
551
552 av_frame_free(&in);
553 return ff_filter_frame(outlink, out);
554 }
555
process_command(AVFilterContext * ctx,const char * cmd,const char * args,char * res,int res_len,int flags)556 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
557 char *res, int res_len, int flags)
558 {
559 RotContext *rot = ctx->priv;
560 int ret;
561
562 if (!strcmp(cmd, "angle") || !strcmp(cmd, "a")) {
563 AVExpr *old = rot->angle_expr;
564 ret = av_expr_parse(&rot->angle_expr, args, var_names,
565 NULL, NULL, NULL, NULL, 0, ctx);
566 if (ret < 0) {
567 av_log(ctx, AV_LOG_ERROR,
568 "Error when parsing the expression '%s' for angle command\n", args);
569 rot->angle_expr = old;
570 return ret;
571 }
572 av_expr_free(old);
573 } else
574 ret = AVERROR(ENOSYS);
575
576 return ret;
577 }
578
579 static const AVFilterPad rotate_inputs[] = {
580 {
581 .name = "default",
582 .type = AVMEDIA_TYPE_VIDEO,
583 .filter_frame = filter_frame,
584 },
585 };
586
587 static const AVFilterPad rotate_outputs[] = {
588 {
589 .name = "default",
590 .type = AVMEDIA_TYPE_VIDEO,
591 .config_props = config_props,
592 },
593 };
594
595 const AVFilter ff_vf_rotate = {
596 .name = "rotate",
597 .description = NULL_IF_CONFIG_SMALL("Rotate the input image."),
598 .priv_size = sizeof(RotContext),
599 .init = init,
600 .uninit = uninit,
601 .process_command = process_command,
602 FILTER_INPUTS(rotate_inputs),
603 FILTER_OUTPUTS(rotate_outputs),
604 FILTER_PIXFMTS_ARRAY(pix_fmts),
605 .priv_class = &rotate_class,
606 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
607 };
608