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2ba45a60 DM |
1 | /* |
2 | * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> | |
3 | * Copyright (c) 2013 Paul B Mahol | |
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 General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2 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 | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along | |
18 | * 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 | #include "libavutil/eval.h" | |
23 | #include "libavutil/imgutils.h" | |
24 | #include "libavutil/pixdesc.h" | |
25 | #include "libavutil/opt.h" | |
26 | #include "avfilter.h" | |
27 | #include "formats.h" | |
28 | #include "internal.h" | |
29 | #include "video.h" | |
30 | ||
31 | #define SUB_PIXEL_BITS 8 | |
32 | #define SUB_PIXELS (1 << SUB_PIXEL_BITS) | |
33 | #define COEFF_BITS 11 | |
34 | ||
35 | #define LINEAR 0 | |
36 | #define CUBIC 1 | |
37 | ||
38 | typedef struct PerspectiveContext { | |
39 | const AVClass *class; | |
40 | char *expr_str[4][2]; | |
41 | double ref[4][2]; | |
42 | int32_t (*pv)[2]; | |
43 | int32_t coeff[SUB_PIXELS][4]; | |
44 | int interpolation; | |
45 | int linesize[4]; | |
46 | int height[4]; | |
47 | int hsub, vsub; | |
48 | int nb_planes; | |
f6fa7814 | 49 | int sense; |
2ba45a60 DM |
50 | |
51 | int (*perspective)(AVFilterContext *ctx, | |
52 | void *arg, int job, int nb_jobs); | |
53 | } PerspectiveContext; | |
54 | ||
55 | #define OFFSET(x) offsetof(PerspectiveContext, x) | |
56 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM | |
57 | ||
f6fa7814 DM |
58 | enum PERSPECTIVESense { |
59 | PERSPECTIVE_SENSE_SOURCE = 0, ///< coordinates give locations in source of corners of destination. | |
60 | PERSPECTIVE_SENSE_DESTINATION = 1, ///< coordinates give locations in destination of corners of source. | |
61 | }; | |
62 | ||
2ba45a60 DM |
63 | static const AVOption perspective_options[] = { |
64 | { "x0", "set top left x coordinate", OFFSET(expr_str[0][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS }, | |
65 | { "y0", "set top left y coordinate", OFFSET(expr_str[0][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS }, | |
66 | { "x1", "set top right x coordinate", OFFSET(expr_str[1][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS }, | |
67 | { "y1", "set top right y coordinate", OFFSET(expr_str[1][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS }, | |
68 | { "x2", "set bottom left x coordinate", OFFSET(expr_str[2][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS }, | |
69 | { "y2", "set bottom left y coordinate", OFFSET(expr_str[2][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS }, | |
70 | { "x3", "set bottom right x coordinate", OFFSET(expr_str[3][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS }, | |
71 | { "y3", "set bottom right y coordinate", OFFSET(expr_str[3][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS }, | |
72 | { "interpolation", "set interpolation", OFFSET(interpolation), AV_OPT_TYPE_INT, {.i64=LINEAR}, 0, 1, FLAGS, "interpolation" }, | |
73 | { "linear", "", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "interpolation" }, | |
74 | { "cubic", "", 0, AV_OPT_TYPE_CONST, {.i64=CUBIC}, 0, 0, FLAGS, "interpolation" }, | |
f6fa7814 DM |
75 | { "sense", "specify the sense of the coordinates", OFFSET(sense), AV_OPT_TYPE_INT, {.i64=PERSPECTIVE_SENSE_SOURCE}, 0, 1, FLAGS, "sense"}, |
76 | { "source", "specify locations in source to send to corners in destination", | |
77 | 0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE_SENSE_SOURCE}, 0, 0, FLAGS, "sense"}, | |
78 | { "destination", "specify locations in destination to send corners of source", | |
79 | 0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE_SENSE_DESTINATION}, 0, 0, FLAGS, "sense"}, | |
80 | ||
2ba45a60 DM |
81 | { NULL } |
82 | }; | |
83 | ||
84 | AVFILTER_DEFINE_CLASS(perspective); | |
85 | ||
86 | static int query_formats(AVFilterContext *ctx) | |
87 | { | |
88 | static const enum AVPixelFormat pix_fmts[] = { | |
89 | AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P, | |
90 | AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P, | |
91 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, | |
92 | AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE | |
93 | }; | |
94 | ||
95 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); | |
96 | return 0; | |
97 | } | |
98 | ||
99 | static inline double get_coeff(double d) | |
100 | { | |
101 | double coeff, A = -0.60; | |
102 | ||
103 | d = fabs(d); | |
104 | ||
105 | if (d < 1.0) | |
106 | coeff = (1.0 - (A + 3.0) * d * d + (A + 2.0) * d * d * d); | |
107 | else if (d < 2.0) | |
108 | coeff = (-4.0 * A + 8.0 * A * d - 5.0 * A * d * d + A * d * d * d); | |
109 | else | |
110 | coeff = 0.0; | |
111 | ||
112 | return coeff; | |
113 | } | |
114 | ||
115 | static const char *const var_names[] = { "W", "H", NULL }; | |
116 | enum { VAR_W, VAR_H, VAR_VARS_NB }; | |
117 | ||
118 | static int config_input(AVFilterLink *inlink) | |
119 | { | |
f6fa7814 DM |
120 | double x0, x1, x2, x3, x4, x5, x6, x7, x8, q; |
121 | double t0, t1, t2, t3; | |
2ba45a60 DM |
122 | AVFilterContext *ctx = inlink->dst; |
123 | PerspectiveContext *s = ctx->priv; | |
124 | double (*ref)[2] = s->ref; | |
125 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); | |
126 | double values[VAR_VARS_NB] = { [VAR_W] = inlink->w, [VAR_H] = inlink->h }; | |
127 | int h = inlink->h; | |
128 | int w = inlink->w; | |
129 | int x, y, i, j, ret; | |
130 | ||
131 | for (i = 0; i < 4; i++) { | |
132 | for (j = 0; j < 2; j++) { | |
133 | if (!s->expr_str[i][j]) | |
134 | return AVERROR(EINVAL); | |
135 | ret = av_expr_parse_and_eval(&s->ref[i][j], s->expr_str[i][j], | |
136 | var_names, &values[0], | |
137 | NULL, NULL, NULL, NULL, | |
138 | 0, 0, ctx); | |
139 | if (ret < 0) | |
140 | return ret; | |
141 | } | |
142 | } | |
143 | ||
144 | s->hsub = desc->log2_chroma_w; | |
145 | s->vsub = desc->log2_chroma_h; | |
146 | s->nb_planes = av_pix_fmt_count_planes(inlink->format); | |
147 | if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0) | |
148 | return ret; | |
149 | ||
150 | s->height[1] = s->height[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h); | |
151 | s->height[0] = s->height[3] = inlink->h; | |
152 | ||
153 | s->pv = av_realloc_f(s->pv, w * h, 2 * sizeof(*s->pv)); | |
154 | if (!s->pv) | |
155 | return AVERROR(ENOMEM); | |
156 | ||
f6fa7814 DM |
157 | switch (s->sense) { |
158 | case PERSPECTIVE_SENSE_SOURCE: | |
159 | x6 = ((ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0]) * | |
160 | (ref[2][1] - ref[3][1]) - | |
161 | ( ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1]) * | |
162 | (ref[2][0] - ref[3][0])) * h; | |
163 | x7 = ((ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1]) * | |
164 | (ref[1][0] - ref[3][0]) - | |
165 | ( ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0]) * | |
166 | (ref[1][1] - ref[3][1])) * w; | |
167 | q = ( ref[1][0] - ref[3][0]) * (ref[2][1] - ref[3][1]) - | |
168 | ( ref[2][0] - ref[3][0]) * (ref[1][1] - ref[3][1]); | |
169 | ||
170 | x0 = q * (ref[1][0] - ref[0][0]) * h + x6 * ref[1][0]; | |
171 | x1 = q * (ref[2][0] - ref[0][0]) * w + x7 * ref[2][0]; | |
172 | x2 = q * ref[0][0] * w * h; | |
173 | x3 = q * (ref[1][1] - ref[0][1]) * h + x6 * ref[1][1]; | |
174 | x4 = q * (ref[2][1] - ref[0][1]) * w + x7 * ref[2][1]; | |
175 | x5 = q * ref[0][1] * w * h; | |
176 | x8 = q * w * h; | |
177 | break; | |
178 | case PERSPECTIVE_SENSE_DESTINATION: | |
179 | t0 = ref[0][0] * (ref[3][1] - ref[1][1]) + | |
180 | ref[1][0] * (ref[0][1] - ref[3][1]) + | |
181 | ref[3][0] * (ref[1][1] - ref[0][1]); | |
182 | t1 = ref[1][0] * (ref[2][1] - ref[3][1]) + | |
183 | ref[2][0] * (ref[3][1] - ref[1][1]) + | |
184 | ref[3][0] * (ref[1][1] - ref[2][1]); | |
185 | t2 = ref[0][0] * (ref[3][1] - ref[2][1]) + | |
186 | ref[2][0] * (ref[0][1] - ref[3][1]) + | |
187 | ref[3][0] * (ref[2][1] - ref[0][1]); | |
188 | t3 = ref[0][0] * (ref[1][1] - ref[2][1]) + | |
189 | ref[1][0] * (ref[2][1] - ref[0][1]) + | |
190 | ref[2][0] * (ref[0][1] - ref[1][1]); | |
191 | ||
192 | x0 = t0 * t1 * w * (ref[2][1] - ref[0][1]); | |
193 | x1 = t0 * t1 * w * (ref[0][0] - ref[2][0]); | |
194 | x2 = t0 * t1 * w * (ref[0][1] * ref[2][0] - ref[0][0] * ref[2][1]); | |
195 | x3 = t1 * t2 * h * (ref[1][1] - ref[0][1]); | |
196 | x4 = t1 * t2 * h * (ref[0][0] - ref[1][0]); | |
197 | x5 = t1 * t2 * h * (ref[0][1] * ref[1][0] - ref[0][0] * ref[1][1]); | |
198 | x6 = t1 * t2 * (ref[1][1] - ref[0][1]) + | |
199 | t0 * t3 * (ref[2][1] - ref[3][1]); | |
200 | x7 = t1 * t2 * (ref[0][0] - ref[1][0]) + | |
201 | t0 * t3 * (ref[3][0] - ref[2][0]); | |
202 | x8 = t1 * t2 * (ref[0][1] * ref[1][0] - ref[0][0] * ref[1][1]) + | |
203 | t0 * t3 * (ref[2][0] * ref[3][1] - ref[2][1] * ref[3][0]); | |
204 | break; | |
205 | } | |
2ba45a60 DM |
206 | |
207 | for (y = 0; y < h; y++){ | |
208 | for (x = 0; x < w; x++){ | |
209 | int u, v; | |
210 | ||
211 | u = (int)floor(SUB_PIXELS * (x0 * x + x1 * y + x2) / | |
f6fa7814 | 212 | (x6 * x + x7 * y + x8) + 0.5); |
2ba45a60 | 213 | v = (int)floor(SUB_PIXELS * (x3 * x + x4 * y + x5) / |
f6fa7814 | 214 | (x6 * x + x7 * y + x8) + 0.5); |
2ba45a60 DM |
215 | |
216 | s->pv[x + y * w][0] = u; | |
217 | s->pv[x + y * w][1] = v; | |
218 | } | |
219 | } | |
220 | ||
221 | for (i = 0; i < SUB_PIXELS; i++){ | |
222 | double d = i / (double)SUB_PIXELS; | |
223 | double temp[4]; | |
224 | double sum = 0; | |
225 | ||
226 | for (j = 0; j < 4; j++) | |
227 | temp[j] = get_coeff(j - d - 1); | |
228 | ||
229 | for (j = 0; j < 4; j++) | |
230 | sum += temp[j]; | |
231 | ||
232 | for (j = 0; j < 4; j++) | |
233 | s->coeff[i][j] = (int)floor((1 << COEFF_BITS) * temp[j] / sum + 0.5); | |
234 | } | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | typedef struct ThreadData { | |
240 | uint8_t *dst; | |
241 | int dst_linesize; | |
242 | uint8_t *src; | |
243 | int src_linesize; | |
244 | int w, h; | |
245 | int hsub, vsub; | |
246 | } ThreadData; | |
247 | ||
248 | static int resample_cubic(AVFilterContext *ctx, void *arg, | |
249 | int job, int nb_jobs) | |
250 | { | |
251 | PerspectiveContext *s = ctx->priv; | |
252 | ThreadData *td = arg; | |
253 | uint8_t *dst = td->dst; | |
254 | int dst_linesize = td->dst_linesize; | |
255 | uint8_t *src = td->src; | |
256 | int src_linesize = td->src_linesize; | |
257 | int w = td->w; | |
258 | int h = td->h; | |
259 | int hsub = td->hsub; | |
260 | int vsub = td->vsub; | |
261 | int start = (h * job) / nb_jobs; | |
262 | int end = (h * (job+1)) / nb_jobs; | |
263 | const int linesize = s->linesize[0]; | |
264 | int x, y; | |
265 | ||
266 | for (y = start; y < end; y++) { | |
267 | int sy = y << vsub; | |
268 | for (x = 0; x < w; x++) { | |
269 | int u, v, subU, subV, sum, sx; | |
270 | ||
271 | sx = x << hsub; | |
272 | u = s->pv[sx + sy * linesize][0] >> hsub; | |
273 | v = s->pv[sx + sy * linesize][1] >> vsub; | |
274 | subU = u & (SUB_PIXELS - 1); | |
275 | subV = v & (SUB_PIXELS - 1); | |
276 | u >>= SUB_PIXEL_BITS; | |
277 | v >>= SUB_PIXEL_BITS; | |
278 | ||
279 | if (u > 0 && v > 0 && u < w - 2 && v < h - 2){ | |
280 | const int index = u + v*src_linesize; | |
281 | const int a = s->coeff[subU][0]; | |
282 | const int b = s->coeff[subU][1]; | |
283 | const int c = s->coeff[subU][2]; | |
284 | const int d = s->coeff[subU][3]; | |
285 | ||
286 | sum = s->coeff[subV][0] * (a * src[index - 1 - src_linesize] + b * src[index - 0 - src_linesize] + | |
287 | c * src[index + 1 - src_linesize] + d * src[index + 2 - src_linesize]) + | |
288 | s->coeff[subV][1] * (a * src[index - 1 ] + b * src[index - 0 ] + | |
289 | c * src[index + 1 ] + d * src[index + 2 ]) + | |
290 | s->coeff[subV][2] * (a * src[index - 1 + src_linesize] + b * src[index - 0 + src_linesize] + | |
291 | c * src[index + 1 + src_linesize] + d * src[index + 2 + src_linesize]) + | |
292 | s->coeff[subV][3] * (a * src[index - 1 + 2 * src_linesize] + b * src[index - 0 + 2 * src_linesize] + | |
293 | c * src[index + 1 + 2 * src_linesize] + d * src[index + 2 + 2 * src_linesize]); | |
294 | } else { | |
295 | int dx, dy; | |
296 | ||
297 | sum = 0; | |
298 | ||
299 | for (dy = 0; dy < 4; dy++) { | |
300 | int iy = v + dy - 1; | |
301 | ||
302 | if (iy < 0) | |
303 | iy = 0; | |
304 | else if (iy >= h) | |
305 | iy = h-1; | |
306 | for (dx = 0; dx < 4; dx++) { | |
307 | int ix = u + dx - 1; | |
308 | ||
309 | if (ix < 0) | |
310 | ix = 0; | |
311 | else if (ix >= w) | |
312 | ix = w - 1; | |
313 | ||
314 | sum += s->coeff[subU][dx] * s->coeff[subV][dy] * src[ ix + iy * src_linesize]; | |
315 | } | |
316 | } | |
317 | } | |
318 | ||
319 | sum = (sum + (1<<(COEFF_BITS * 2 - 1))) >> (COEFF_BITS * 2); | |
320 | sum = av_clip(sum, 0, 255); | |
321 | dst[x + y * dst_linesize] = sum; | |
322 | } | |
323 | } | |
324 | return 0; | |
325 | } | |
326 | ||
327 | static int resample_linear(AVFilterContext *ctx, void *arg, | |
328 | int job, int nb_jobs) | |
329 | { | |
330 | PerspectiveContext *s = ctx->priv; | |
331 | ThreadData *td = arg; | |
332 | uint8_t *dst = td->dst; | |
333 | int dst_linesize = td->dst_linesize; | |
334 | uint8_t *src = td->src; | |
335 | int src_linesize = td->src_linesize; | |
336 | int w = td->w; | |
337 | int h = td->h; | |
338 | int hsub = td->hsub; | |
339 | int vsub = td->vsub; | |
340 | int start = (h * job) / nb_jobs; | |
341 | int end = (h * (job+1)) / nb_jobs; | |
342 | const int linesize = s->linesize[0]; | |
343 | int x, y; | |
344 | ||
345 | for (y = start; y < end; y++){ | |
346 | int sy = y << vsub; | |
347 | for (x = 0; x < w; x++){ | |
348 | int u, v, subU, subV, sum, sx, index, subUI, subVI; | |
349 | ||
350 | sx = x << hsub; | |
351 | u = s->pv[sx + sy * linesize][0] >> hsub; | |
352 | v = s->pv[sx + sy * linesize][1] >> vsub; | |
353 | subU = u & (SUB_PIXELS - 1); | |
354 | subV = v & (SUB_PIXELS - 1); | |
355 | u >>= SUB_PIXEL_BITS; | |
356 | v >>= SUB_PIXEL_BITS; | |
357 | ||
358 | index = u + v * src_linesize; | |
359 | subUI = SUB_PIXELS - subU; | |
360 | subVI = SUB_PIXELS - subV; | |
361 | ||
362 | if ((unsigned)u < (unsigned)(w - 1)){ | |
363 | if((unsigned)v < (unsigned)(h - 1)){ | |
364 | sum = subVI * (subUI * src[index] + subU * src[index + 1]) + | |
365 | subV * (subUI * src[index + src_linesize] + subU * src[index + src_linesize + 1]); | |
366 | sum = (sum + (1 << (SUB_PIXEL_BITS * 2 - 1)))>> (SUB_PIXEL_BITS * 2); | |
367 | } else { | |
368 | if (v < 0) | |
369 | v = 0; | |
370 | else | |
371 | v = h - 1; | |
372 | index = u + v * src_linesize; | |
373 | sum = subUI * src[index] + subU * src[index + 1]; | |
374 | sum = (sum + (1 << (SUB_PIXEL_BITS - 1))) >> SUB_PIXEL_BITS; | |
375 | } | |
376 | } else { | |
377 | if (u < 0) | |
378 | u = 0; | |
379 | else | |
380 | u = w - 1; | |
381 | if ((unsigned)v < (unsigned)(h - 1)){ | |
382 | index = u + v * src_linesize; | |
383 | sum = subVI * src[index] + subV * src[index + src_linesize]; | |
384 | sum = (sum + (1 << (SUB_PIXEL_BITS - 1))) >> SUB_PIXEL_BITS; | |
385 | } else { | |
386 | if (v < 0) | |
387 | v = 0; | |
388 | else | |
389 | v = h - 1; | |
390 | index = u + v * src_linesize; | |
391 | sum = src[index]; | |
392 | } | |
393 | } | |
394 | ||
395 | sum = av_clip(sum, 0, 255); | |
396 | dst[x + y * dst_linesize] = sum; | |
397 | } | |
398 | } | |
399 | return 0; | |
400 | } | |
401 | ||
402 | static av_cold int init(AVFilterContext *ctx) | |
403 | { | |
404 | PerspectiveContext *s = ctx->priv; | |
405 | ||
406 | switch (s->interpolation) { | |
407 | case LINEAR: s->perspective = resample_linear; break; | |
408 | case CUBIC: s->perspective = resample_cubic; break; | |
409 | } | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
414 | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) | |
415 | { | |
416 | AVFilterContext *ctx = inlink->dst; | |
417 | AVFilterLink *outlink = ctx->outputs[0]; | |
418 | PerspectiveContext *s = ctx->priv; | |
419 | AVFrame *out; | |
420 | int plane; | |
421 | ||
422 | out = ff_get_video_buffer(outlink, outlink->w, outlink->h); | |
423 | if (!out) { | |
424 | av_frame_free(&frame); | |
425 | return AVERROR(ENOMEM); | |
426 | } | |
427 | av_frame_copy_props(out, frame); | |
428 | ||
429 | for (plane = 0; plane < s->nb_planes; plane++) { | |
430 | int hsub = plane == 1 || plane == 2 ? s->hsub : 0; | |
431 | int vsub = plane == 1 || plane == 2 ? s->vsub : 0; | |
432 | ThreadData td = {.dst = out->data[plane], | |
433 | .dst_linesize = out->linesize[plane], | |
434 | .src = frame->data[plane], | |
435 | .src_linesize = frame->linesize[plane], | |
436 | .w = s->linesize[plane], | |
437 | .h = s->height[plane], | |
438 | .hsub = hsub, | |
439 | .vsub = vsub }; | |
440 | ctx->internal->execute(ctx, s->perspective, &td, NULL, FFMIN(td.h, ctx->graph->nb_threads)); | |
441 | } | |
442 | ||
443 | av_frame_free(&frame); | |
444 | return ff_filter_frame(outlink, out); | |
445 | } | |
446 | ||
447 | static av_cold void uninit(AVFilterContext *ctx) | |
448 | { | |
449 | PerspectiveContext *s = ctx->priv; | |
450 | ||
451 | av_freep(&s->pv); | |
452 | } | |
453 | ||
454 | static const AVFilterPad perspective_inputs[] = { | |
455 | { | |
456 | .name = "default", | |
457 | .type = AVMEDIA_TYPE_VIDEO, | |
458 | .filter_frame = filter_frame, | |
459 | .config_props = config_input, | |
460 | }, | |
461 | { NULL } | |
462 | }; | |
463 | ||
464 | static const AVFilterPad perspective_outputs[] = { | |
465 | { | |
466 | .name = "default", | |
467 | .type = AVMEDIA_TYPE_VIDEO, | |
468 | }, | |
469 | { NULL } | |
470 | }; | |
471 | ||
472 | AVFilter ff_vf_perspective = { | |
473 | .name = "perspective", | |
474 | .description = NULL_IF_CONFIG_SMALL("Correct the perspective of video."), | |
475 | .priv_size = sizeof(PerspectiveContext), | |
476 | .init = init, | |
477 | .uninit = uninit, | |
478 | .query_formats = query_formats, | |
479 | .inputs = perspective_inputs, | |
480 | .outputs = perspective_outputs, | |
481 | .priv_class = &perspective_class, | |
482 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS, | |
483 | }; |