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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavfilter / vf_perspective.c
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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
38typedef 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;
49
50 int (*perspective)(AVFilterContext *ctx,
51 void *arg, int job, int nb_jobs);
52} PerspectiveContext;
53
54#define OFFSET(x) offsetof(PerspectiveContext, x)
55#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
56
57static const AVOption perspective_options[] = {
58 { "x0", "set top left x coordinate", OFFSET(expr_str[0][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
59 { "y0", "set top left y coordinate", OFFSET(expr_str[0][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
60 { "x1", "set top right x coordinate", OFFSET(expr_str[1][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS },
61 { "y1", "set top right y coordinate", OFFSET(expr_str[1][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
62 { "x2", "set bottom left x coordinate", OFFSET(expr_str[2][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
63 { "y2", "set bottom left y coordinate", OFFSET(expr_str[2][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS },
64 { "x3", "set bottom right x coordinate", OFFSET(expr_str[3][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS },
65 { "y3", "set bottom right y coordinate", OFFSET(expr_str[3][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS },
66 { "interpolation", "set interpolation", OFFSET(interpolation), AV_OPT_TYPE_INT, {.i64=LINEAR}, 0, 1, FLAGS, "interpolation" },
67 { "linear", "", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "interpolation" },
68 { "cubic", "", 0, AV_OPT_TYPE_CONST, {.i64=CUBIC}, 0, 0, FLAGS, "interpolation" },
69 { NULL }
70};
71
72AVFILTER_DEFINE_CLASS(perspective);
73
74static int query_formats(AVFilterContext *ctx)
75{
76 static const enum AVPixelFormat pix_fmts[] = {
77 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
78 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
79 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
80 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
81 };
82
83 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
84 return 0;
85}
86
87static inline double get_coeff(double d)
88{
89 double coeff, A = -0.60;
90
91 d = fabs(d);
92
93 if (d < 1.0)
94 coeff = (1.0 - (A + 3.0) * d * d + (A + 2.0) * d * d * d);
95 else if (d < 2.0)
96 coeff = (-4.0 * A + 8.0 * A * d - 5.0 * A * d * d + A * d * d * d);
97 else
98 coeff = 0.0;
99
100 return coeff;
101}
102
103static const char *const var_names[] = { "W", "H", NULL };
104enum { VAR_W, VAR_H, VAR_VARS_NB };
105
106static int config_input(AVFilterLink *inlink)
107{
108 double x0, x1, x2, x3, x4, x5, x6, x7, q;
109 AVFilterContext *ctx = inlink->dst;
110 PerspectiveContext *s = ctx->priv;
111 double (*ref)[2] = s->ref;
112 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
113 double values[VAR_VARS_NB] = { [VAR_W] = inlink->w, [VAR_H] = inlink->h };
114 int h = inlink->h;
115 int w = inlink->w;
116 int x, y, i, j, ret;
117
118 for (i = 0; i < 4; i++) {
119 for (j = 0; j < 2; j++) {
120 if (!s->expr_str[i][j])
121 return AVERROR(EINVAL);
122 ret = av_expr_parse_and_eval(&s->ref[i][j], s->expr_str[i][j],
123 var_names, &values[0],
124 NULL, NULL, NULL, NULL,
125 0, 0, ctx);
126 if (ret < 0)
127 return ret;
128 }
129 }
130
131 s->hsub = desc->log2_chroma_w;
132 s->vsub = desc->log2_chroma_h;
133 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
134 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
135 return ret;
136
137 s->height[1] = s->height[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
138 s->height[0] = s->height[3] = inlink->h;
139
140 s->pv = av_realloc_f(s->pv, w * h, 2 * sizeof(*s->pv));
141 if (!s->pv)
142 return AVERROR(ENOMEM);
143
144 x6 = ((ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0]) *
145 (ref[2][1] - ref[3][1]) -
146 ( ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1]) *
147 (ref[2][0] - ref[3][0])) * h;
148 x7 = ((ref[0][1] - ref[1][1] - ref[2][1] + ref[3][1]) *
149 (ref[1][0] - ref[3][0]) -
150 ( ref[0][0] - ref[1][0] - ref[2][0] + ref[3][0]) *
151 (ref[1][1] - ref[3][1])) * w;
152 q = ( ref[1][0] - ref[3][0]) * (ref[2][1] - ref[3][1]) -
153 ( ref[2][0] - ref[3][0]) * (ref[1][1] - ref[3][1]);
154
155 x0 = q * (ref[1][0] - ref[0][0]) * h + x6 * ref[1][0];
156 x1 = q * (ref[2][0] - ref[0][0]) * w + x7 * ref[2][0];
157 x2 = q * ref[0][0] * w * h;
158 x3 = q * (ref[1][1] - ref[0][1]) * h + x6 * ref[1][1];
159 x4 = q * (ref[2][1] - ref[0][1]) * w + x7 * ref[2][1];
160 x5 = q * ref[0][1] * w * h;
161
162 for (y = 0; y < h; y++){
163 for (x = 0; x < w; x++){
164 int u, v;
165
166 u = (int)floor(SUB_PIXELS * (x0 * x + x1 * y + x2) /
167 (x6 * x + x7 * y + q * w * h) + 0.5);
168 v = (int)floor(SUB_PIXELS * (x3 * x + x4 * y + x5) /
169 (x6 * x + x7 * y + q * w * h) + 0.5);
170
171 s->pv[x + y * w][0] = u;
172 s->pv[x + y * w][1] = v;
173 }
174 }
175
176 for (i = 0; i < SUB_PIXELS; i++){
177 double d = i / (double)SUB_PIXELS;
178 double temp[4];
179 double sum = 0;
180
181 for (j = 0; j < 4; j++)
182 temp[j] = get_coeff(j - d - 1);
183
184 for (j = 0; j < 4; j++)
185 sum += temp[j];
186
187 for (j = 0; j < 4; j++)
188 s->coeff[i][j] = (int)floor((1 << COEFF_BITS) * temp[j] / sum + 0.5);
189 }
190
191 return 0;
192}
193
194typedef struct ThreadData {
195 uint8_t *dst;
196 int dst_linesize;
197 uint8_t *src;
198 int src_linesize;
199 int w, h;
200 int hsub, vsub;
201} ThreadData;
202
203static int resample_cubic(AVFilterContext *ctx, void *arg,
204 int job, int nb_jobs)
205{
206 PerspectiveContext *s = ctx->priv;
207 ThreadData *td = arg;
208 uint8_t *dst = td->dst;
209 int dst_linesize = td->dst_linesize;
210 uint8_t *src = td->src;
211 int src_linesize = td->src_linesize;
212 int w = td->w;
213 int h = td->h;
214 int hsub = td->hsub;
215 int vsub = td->vsub;
216 int start = (h * job) / nb_jobs;
217 int end = (h * (job+1)) / nb_jobs;
218 const int linesize = s->linesize[0];
219 int x, y;
220
221 for (y = start; y < end; y++) {
222 int sy = y << vsub;
223 for (x = 0; x < w; x++) {
224 int u, v, subU, subV, sum, sx;
225
226 sx = x << hsub;
227 u = s->pv[sx + sy * linesize][0] >> hsub;
228 v = s->pv[sx + sy * linesize][1] >> vsub;
229 subU = u & (SUB_PIXELS - 1);
230 subV = v & (SUB_PIXELS - 1);
231 u >>= SUB_PIXEL_BITS;
232 v >>= SUB_PIXEL_BITS;
233
234 if (u > 0 && v > 0 && u < w - 2 && v < h - 2){
235 const int index = u + v*src_linesize;
236 const int a = s->coeff[subU][0];
237 const int b = s->coeff[subU][1];
238 const int c = s->coeff[subU][2];
239 const int d = s->coeff[subU][3];
240
241 sum = s->coeff[subV][0] * (a * src[index - 1 - src_linesize] + b * src[index - 0 - src_linesize] +
242 c * src[index + 1 - src_linesize] + d * src[index + 2 - src_linesize]) +
243 s->coeff[subV][1] * (a * src[index - 1 ] + b * src[index - 0 ] +
244 c * src[index + 1 ] + d * src[index + 2 ]) +
245 s->coeff[subV][2] * (a * src[index - 1 + src_linesize] + b * src[index - 0 + src_linesize] +
246 c * src[index + 1 + src_linesize] + d * src[index + 2 + src_linesize]) +
247 s->coeff[subV][3] * (a * src[index - 1 + 2 * src_linesize] + b * src[index - 0 + 2 * src_linesize] +
248 c * src[index + 1 + 2 * src_linesize] + d * src[index + 2 + 2 * src_linesize]);
249 } else {
250 int dx, dy;
251
252 sum = 0;
253
254 for (dy = 0; dy < 4; dy++) {
255 int iy = v + dy - 1;
256
257 if (iy < 0)
258 iy = 0;
259 else if (iy >= h)
260 iy = h-1;
261 for (dx = 0; dx < 4; dx++) {
262 int ix = u + dx - 1;
263
264 if (ix < 0)
265 ix = 0;
266 else if (ix >= w)
267 ix = w - 1;
268
269 sum += s->coeff[subU][dx] * s->coeff[subV][dy] * src[ ix + iy * src_linesize];
270 }
271 }
272 }
273
274 sum = (sum + (1<<(COEFF_BITS * 2 - 1))) >> (COEFF_BITS * 2);
275 sum = av_clip(sum, 0, 255);
276 dst[x + y * dst_linesize] = sum;
277 }
278 }
279 return 0;
280}
281
282static int resample_linear(AVFilterContext *ctx, void *arg,
283 int job, int nb_jobs)
284{
285 PerspectiveContext *s = ctx->priv;
286 ThreadData *td = arg;
287 uint8_t *dst = td->dst;
288 int dst_linesize = td->dst_linesize;
289 uint8_t *src = td->src;
290 int src_linesize = td->src_linesize;
291 int w = td->w;
292 int h = td->h;
293 int hsub = td->hsub;
294 int vsub = td->vsub;
295 int start = (h * job) / nb_jobs;
296 int end = (h * (job+1)) / nb_jobs;
297 const int linesize = s->linesize[0];
298 int x, y;
299
300 for (y = start; y < end; y++){
301 int sy = y << vsub;
302 for (x = 0; x < w; x++){
303 int u, v, subU, subV, sum, sx, index, subUI, subVI;
304
305 sx = x << hsub;
306 u = s->pv[sx + sy * linesize][0] >> hsub;
307 v = s->pv[sx + sy * linesize][1] >> vsub;
308 subU = u & (SUB_PIXELS - 1);
309 subV = v & (SUB_PIXELS - 1);
310 u >>= SUB_PIXEL_BITS;
311 v >>= SUB_PIXEL_BITS;
312
313 index = u + v * src_linesize;
314 subUI = SUB_PIXELS - subU;
315 subVI = SUB_PIXELS - subV;
316
317 if ((unsigned)u < (unsigned)(w - 1)){
318 if((unsigned)v < (unsigned)(h - 1)){
319 sum = subVI * (subUI * src[index] + subU * src[index + 1]) +
320 subV * (subUI * src[index + src_linesize] + subU * src[index + src_linesize + 1]);
321 sum = (sum + (1 << (SUB_PIXEL_BITS * 2 - 1)))>> (SUB_PIXEL_BITS * 2);
322 } else {
323 if (v < 0)
324 v = 0;
325 else
326 v = h - 1;
327 index = u + v * src_linesize;
328 sum = subUI * src[index] + subU * src[index + 1];
329 sum = (sum + (1 << (SUB_PIXEL_BITS - 1))) >> SUB_PIXEL_BITS;
330 }
331 } else {
332 if (u < 0)
333 u = 0;
334 else
335 u = w - 1;
336 if ((unsigned)v < (unsigned)(h - 1)){
337 index = u + v * src_linesize;
338 sum = subVI * src[index] + subV * src[index + src_linesize];
339 sum = (sum + (1 << (SUB_PIXEL_BITS - 1))) >> SUB_PIXEL_BITS;
340 } else {
341 if (v < 0)
342 v = 0;
343 else
344 v = h - 1;
345 index = u + v * src_linesize;
346 sum = src[index];
347 }
348 }
349
350 sum = av_clip(sum, 0, 255);
351 dst[x + y * dst_linesize] = sum;
352 }
353 }
354 return 0;
355}
356
357static av_cold int init(AVFilterContext *ctx)
358{
359 PerspectiveContext *s = ctx->priv;
360
361 switch (s->interpolation) {
362 case LINEAR: s->perspective = resample_linear; break;
363 case CUBIC: s->perspective = resample_cubic; break;
364 }
365
366 return 0;
367}
368
369static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
370{
371 AVFilterContext *ctx = inlink->dst;
372 AVFilterLink *outlink = ctx->outputs[0];
373 PerspectiveContext *s = ctx->priv;
374 AVFrame *out;
375 int plane;
376
377 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
378 if (!out) {
379 av_frame_free(&frame);
380 return AVERROR(ENOMEM);
381 }
382 av_frame_copy_props(out, frame);
383
384 for (plane = 0; plane < s->nb_planes; plane++) {
385 int hsub = plane == 1 || plane == 2 ? s->hsub : 0;
386 int vsub = plane == 1 || plane == 2 ? s->vsub : 0;
387 ThreadData td = {.dst = out->data[plane],
388 .dst_linesize = out->linesize[plane],
389 .src = frame->data[plane],
390 .src_linesize = frame->linesize[plane],
391 .w = s->linesize[plane],
392 .h = s->height[plane],
393 .hsub = hsub,
394 .vsub = vsub };
395 ctx->internal->execute(ctx, s->perspective, &td, NULL, FFMIN(td.h, ctx->graph->nb_threads));
396 }
397
398 av_frame_free(&frame);
399 return ff_filter_frame(outlink, out);
400}
401
402static av_cold void uninit(AVFilterContext *ctx)
403{
404 PerspectiveContext *s = ctx->priv;
405
406 av_freep(&s->pv);
407}
408
409static const AVFilterPad perspective_inputs[] = {
410 {
411 .name = "default",
412 .type = AVMEDIA_TYPE_VIDEO,
413 .filter_frame = filter_frame,
414 .config_props = config_input,
415 },
416 { NULL }
417};
418
419static const AVFilterPad perspective_outputs[] = {
420 {
421 .name = "default",
422 .type = AVMEDIA_TYPE_VIDEO,
423 },
424 { NULL }
425};
426
427AVFilter ff_vf_perspective = {
428 .name = "perspective",
429 .description = NULL_IF_CONFIG_SMALL("Correct the perspective of video."),
430 .priv_size = sizeof(PerspectiveContext),
431 .init = init,
432 .uninit = uninit,
433 .query_formats = query_formats,
434 .inputs = perspective_inputs,
435 .outputs = perspective_outputs,
436 .priv_class = &perspective_class,
437 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
438};
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