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path: root/libavfilter/vf_zoompan.c (plain)
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1/*
2 * Copyright (c) 2013 Paul B Mahol
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/avassert.h"
22#include "libavutil/eval.h"
23#include "libavutil/opt.h"
24#include "libavutil/pixdesc.h"
25#include "avfilter.h"
26#include "formats.h"
27#include "internal.h"
28#include "video.h"
29#include "libswscale/swscale.h"
30
31static const char *const var_names[] = {
32 "in_w", "iw",
33 "in_h", "ih",
34 "out_w", "ow",
35 "out_h", "oh",
36 "in",
37 "on",
38 "duration",
39 "pduration",
40 "time",
41 "frame",
42 "zoom",
43 "pzoom",
44 "x", "px",
45 "y", "py",
46 "a",
47 "sar",
48 "dar",
49 "hsub",
50 "vsub",
51 NULL
52};
53
54enum var_name {
55 VAR_IN_W, VAR_IW,
56 VAR_IN_H, VAR_IH,
57 VAR_OUT_W, VAR_OW,
58 VAR_OUT_H, VAR_OH,
59 VAR_IN,
60 VAR_ON,
61 VAR_DURATION,
62 VAR_PDURATION,
63 VAR_TIME,
64 VAR_FRAME,
65 VAR_ZOOM,
66 VAR_PZOOM,
67 VAR_X, VAR_PX,
68 VAR_Y, VAR_PY,
69 VAR_A,
70 VAR_SAR,
71 VAR_DAR,
72 VAR_HSUB,
73 VAR_VSUB,
74 VARS_NB
75};
76
77typedef struct ZPcontext {
78 const AVClass *class;
79 char *zoom_expr_str;
80 char *x_expr_str;
81 char *y_expr_str;
82 char *duration_expr_str;
83 int w, h;
84 double x, y;
85 double prev_zoom;
86 int prev_nb_frames;
87 struct SwsContext *sws;
88 int64_t frame_count;
89 const AVPixFmtDescriptor *desc;
90 AVFrame *in;
91 double var_values[VARS_NB];
92 int nb_frames;
93 int current_frame;
94 int finished;
95 AVRational framerate;
96} ZPContext;
97
98#define OFFSET(x) offsetof(ZPContext, x)
99#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
100static const AVOption zoompan_options[] = {
101 { "zoom", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS },
102 { "z", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS },
103 { "x", "set the x expression", OFFSET(x_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS },
104 { "y", "set the y expression", OFFSET(y_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS },
105 { "d", "set the duration expression", OFFSET(duration_expr_str), AV_OPT_TYPE_STRING, {.str="90"}, .flags = FLAGS },
106 { "s", "set the output image size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="hd720"}, .flags = FLAGS },
107 { "fps", "set the output framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, { .str = "25" }, 0, INT_MAX, .flags = FLAGS },
108 { NULL }
109};
110
111AVFILTER_DEFINE_CLASS(zoompan);
112
113static av_cold int init(AVFilterContext *ctx)
114{
115 ZPContext *s = ctx->priv;
116
117 s->prev_zoom = 1;
118 return 0;
119}
120
121static int config_output(AVFilterLink *outlink)
122{
123 AVFilterContext *ctx = outlink->src;
124 ZPContext *s = ctx->priv;
125
126 outlink->w = s->w;
127 outlink->h = s->h;
128 outlink->time_base = av_inv_q(s->framerate);
129 outlink->frame_rate = s->framerate;
130 s->desc = av_pix_fmt_desc_get(outlink->format);
131
132 return 0;
133}
134
135static int output_single_frame(AVFilterContext *ctx, AVFrame *in, double *var_values, int i,
136 double *zoom, double *dx, double *dy)
137{
138 ZPContext *s = ctx->priv;
139 AVFilterLink *outlink = ctx->outputs[0];
140 int64_t pts = s->frame_count;
141 int k, x, y, w, h, ret = 0;
142 uint8_t *input[4];
143 int px[4], py[4];
144 AVFrame *out;
145
146 var_values[VAR_PX] = s->x;
147 var_values[VAR_PY] = s->y;
148 var_values[VAR_PZOOM] = s->prev_zoom;
149 var_values[VAR_PDURATION] = s->prev_nb_frames;
150 var_values[VAR_TIME] = pts * av_q2d(outlink->time_base);
151 var_values[VAR_FRAME] = i;
152 var_values[VAR_ON] = outlink->frame_count_in + 1;
153 if ((ret = av_expr_parse_and_eval(zoom, s->zoom_expr_str,
154 var_names, var_values,
155 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
156 return ret;
157
158 *zoom = av_clipd(*zoom, 1, 10);
159 var_values[VAR_ZOOM] = *zoom;
160 w = in->width * (1.0 / *zoom);
161 h = in->height * (1.0 / *zoom);
162
163 if ((ret = av_expr_parse_and_eval(dx, s->x_expr_str,
164 var_names, var_values,
165 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
166 return ret;
167 x = *dx = av_clipd(*dx, 0, FFMAX(in->width - w, 0));
168 var_values[VAR_X] = *dx;
169 x &= ~((1 << s->desc->log2_chroma_w) - 1);
170
171 if ((ret = av_expr_parse_and_eval(dy, s->y_expr_str,
172 var_names, var_values,
173 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
174 return ret;
175 y = *dy = av_clipd(*dy, 0, FFMAX(in->height - h, 0));
176 var_values[VAR_Y] = *dy;
177 y &= ~((1 << s->desc->log2_chroma_h) - 1);
178
179 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
180 if (!out) {
181 ret = AVERROR(ENOMEM);
182 return ret;
183 }
184
185 px[1] = px[2] = AV_CEIL_RSHIFT(x, s->desc->log2_chroma_w);
186 px[0] = px[3] = x;
187
188 py[1] = py[2] = AV_CEIL_RSHIFT(y, s->desc->log2_chroma_h);
189 py[0] = py[3] = y;
190
191 s->sws = sws_alloc_context();
192 if (!s->sws) {
193 ret = AVERROR(ENOMEM);
194 goto error;
195 }
196
197 for (k = 0; in->data[k]; k++)
198 input[k] = in->data[k] + py[k] * in->linesize[k] + px[k];
199
200 av_opt_set_int(s->sws, "srcw", w, 0);
201 av_opt_set_int(s->sws, "srch", h, 0);
202 av_opt_set_int(s->sws, "src_format", in->format, 0);
203 av_opt_set_int(s->sws, "dstw", outlink->w, 0);
204 av_opt_set_int(s->sws, "dsth", outlink->h, 0);
205 av_opt_set_int(s->sws, "dst_format", outlink->format, 0);
206 av_opt_set_int(s->sws, "sws_flags", SWS_BICUBIC, 0);
207
208 if ((ret = sws_init_context(s->sws, NULL, NULL)) < 0)
209 goto error;
210
211 sws_scale(s->sws, (const uint8_t *const *)&input, in->linesize, 0, h, out->data, out->linesize);
212
213 out->pts = pts;
214 s->frame_count++;
215
216 ret = ff_filter_frame(outlink, out);
217 sws_freeContext(s->sws);
218 s->sws = NULL;
219 s->current_frame++;
220 return ret;
221error:
222 av_frame_free(&out);
223 return ret;
224}
225
226static int filter_frame(AVFilterLink *inlink, AVFrame *in)
227{
228 AVFilterContext *ctx = inlink->dst;
229 AVFilterLink *outlink = ctx->outputs[0];
230 ZPContext *s = ctx->priv;
231 double nb_frames;
232 int ret;
233
234 av_assert0(s->in == NULL);
235
236 s->finished = 0;
237 s->var_values[VAR_IN_W] = s->var_values[VAR_IW] = in->width;
238 s->var_values[VAR_IN_H] = s->var_values[VAR_IH] = in->height;
239 s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = s->w;
240 s->var_values[VAR_OUT_H] = s->var_values[VAR_OH] = s->h;
241 s->var_values[VAR_IN] = inlink->frame_count_out + 1;
242 s->var_values[VAR_ON] = outlink->frame_count_in + 1;
243 s->var_values[VAR_PX] = s->x;
244 s->var_values[VAR_PY] = s->y;
245 s->var_values[VAR_X] = 0;
246 s->var_values[VAR_Y] = 0;
247 s->var_values[VAR_PZOOM] = s->prev_zoom;
248 s->var_values[VAR_ZOOM] = 1;
249 s->var_values[VAR_PDURATION] = s->prev_nb_frames;
250 s->var_values[VAR_A] = (double) in->width / in->height;
251 s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
252 (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
253 s->var_values[VAR_DAR] = s->var_values[VAR_A] * s->var_values[VAR_SAR];
254 s->var_values[VAR_HSUB] = 1 << s->desc->log2_chroma_w;
255 s->var_values[VAR_VSUB] = 1 << s->desc->log2_chroma_h;
256
257 if ((ret = av_expr_parse_and_eval(&nb_frames, s->duration_expr_str,
258 var_names, s->var_values,
259 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
260 av_frame_free(&in);
261 return ret;
262 }
263
264 s->var_values[VAR_DURATION] = s->nb_frames = nb_frames;
265 s->in = in;
266
267 return 0;
268}
269
270static int request_frame(AVFilterLink *outlink)
271{
272 AVFilterContext *ctx = outlink->src;
273 ZPContext *s = ctx->priv;
274 AVFrame *in = s->in;
275 double zoom=-1, dx=-1, dy=-1;
276 int ret = -1;
277
278 if (in) {
279 ret = output_single_frame(ctx, in, s->var_values, s->current_frame,
280 &zoom, &dx, &dy);
281 if (ret < 0)
282 goto fail;
283 }
284
285 if (s->current_frame >= s->nb_frames) {
286 if (dx != -1)
287 s->x = dx;
288 if (dy != -1)
289 s->y = dy;
290 if (zoom != -1)
291 s->prev_zoom = zoom;
292 s->prev_nb_frames = s->nb_frames;
293 s->nb_frames = 0;
294 s->current_frame = 0;
295 av_frame_free(&s->in);
296 s->finished = 1;
297 ret = ff_request_frame(ctx->inputs[0]);
298 }
299
300fail:
301 sws_freeContext(s->sws);
302 s->sws = NULL;
303
304 return ret;
305}
306
307static int poll_frame(AVFilterLink *link)
308{
309 ZPContext *s = link->src->priv;
310 return s->nb_frames - s->current_frame;
311}
312
313static int query_formats(AVFilterContext *ctx)
314{
315 static const enum AVPixelFormat pix_fmts[] = {
316 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
317 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
318 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
319 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P,
320 AV_PIX_FMT_YUVA420P,
321 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
322 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
323 AV_PIX_FMT_YUVJ411P,
324 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
325 AV_PIX_FMT_GRAY8,
326 AV_PIX_FMT_NONE
327 };
328
329 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
330 if (!fmts_list)
331 return AVERROR(ENOMEM);
332 return ff_set_common_formats(ctx, fmts_list);
333}
334
335static av_cold void uninit(AVFilterContext *ctx)
336{
337 ZPContext *s = ctx->priv;
338
339 sws_freeContext(s->sws);
340 s->sws = NULL;
341}
342
343static const AVFilterPad inputs[] = {
344 {
345 .name = "default",
346 .type = AVMEDIA_TYPE_VIDEO,
347 .filter_frame = filter_frame,
348 .needs_fifo = 1,
349 },
350 { NULL }
351};
352
353static const AVFilterPad outputs[] = {
354 {
355 .name = "default",
356 .type = AVMEDIA_TYPE_VIDEO,
357 .config_props = config_output,
358 .poll_frame = poll_frame,
359 .request_frame = request_frame,
360 },
361 { NULL }
362};
363
364AVFilter ff_vf_zoompan = {
365 .name = "zoompan",
366 .description = NULL_IF_CONFIG_SMALL("Apply Zoom & Pan effect."),
367 .priv_size = sizeof(ZPContext),
368 .priv_class = &zoompan_class,
369 .init = init,
370 .uninit = uninit,
371 .query_formats = query_formats,
372 .inputs = inputs,
373 .outputs = outputs,
374 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
375};
376
generated by cgit at 2024-05-17 15:55:06 (GMT)