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 "filters.h"
27 #include "formats.h"
28 #include "internal.h"
29 #include "video.h"
30 #include "libswscale/swscale.h"
31
32 static const char *const var_names[] = {
33 "in_w", "iw",
34 "in_h", "ih",
35 "out_w", "ow",
36 "out_h", "oh",
37 "in",
38 "on",
39 "duration",
40 "pduration",
41 "time",
42 "frame",
43 "zoom",
44 "pzoom",
45 "x", "px",
46 "y", "py",
47 "a",
48 "sar",
49 "dar",
50 "hsub",
51 "vsub",
52 NULL
53 };
54
55 enum var_name {
56 VAR_IN_W, VAR_IW,
57 VAR_IN_H, VAR_IH,
58 VAR_OUT_W, VAR_OW,
59 VAR_OUT_H, VAR_OH,
60 VAR_IN,
61 VAR_ON,
62 VAR_DURATION,
63 VAR_PDURATION,
64 VAR_TIME,
65 VAR_FRAME,
66 VAR_ZOOM,
67 VAR_PZOOM,
68 VAR_X, VAR_PX,
69 VAR_Y, VAR_PY,
70 VAR_A,
71 VAR_SAR,
72 VAR_DAR,
73 VAR_HSUB,
74 VAR_VSUB,
75 VARS_NB
76 };
77
78 typedef struct ZPcontext {
79 const AVClass *class;
80 char *zoom_expr_str;
81 char *x_expr_str;
82 char *y_expr_str;
83 char *duration_expr_str;
84
85 AVExpr *zoom_expr, *x_expr, *y_expr;
86
87 int w, h;
88 double x, y;
89 double prev_zoom;
90 int prev_nb_frames;
91 struct SwsContext *sws;
92 int64_t frame_count;
93 const AVPixFmtDescriptor *desc;
94 AVFrame *in;
95 double var_values[VARS_NB];
96 int nb_frames;
97 int current_frame;
98 int finished;
99 AVRational framerate;
100 } ZPContext;
101
102 #define OFFSET(x) offsetof(ZPContext, x)
103 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
104 static const AVOption zoompan_options[] = {
105 { "zoom", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS },
106 { "z", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS },
107 { "x", "set the x expression", OFFSET(x_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS },
108 { "y", "set the y expression", OFFSET(y_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS },
109 { "d", "set the duration expression", OFFSET(duration_expr_str), AV_OPT_TYPE_STRING, {.str="90"}, .flags = FLAGS },
110 { "s", "set the output image size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="hd720"}, .flags = FLAGS },
111 { "fps", "set the output framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, { .str = "25" }, 0, INT_MAX, .flags = FLAGS },
112 { NULL }
113 };
114
115 AVFILTER_DEFINE_CLASS(zoompan);
116
init(AVFilterContext * ctx)117 static av_cold int init(AVFilterContext *ctx)
118 {
119 ZPContext *s = ctx->priv;
120
121 s->prev_zoom = 1;
122 return 0;
123 }
124
config_output(AVFilterLink * outlink)125 static int config_output(AVFilterLink *outlink)
126 {
127 AVFilterContext *ctx = outlink->src;
128 ZPContext *s = ctx->priv;
129 int ret;
130
131 outlink->w = s->w;
132 outlink->h = s->h;
133 outlink->time_base = av_inv_q(s->framerate);
134 outlink->frame_rate = s->framerate;
135 s->desc = av_pix_fmt_desc_get(outlink->format);
136 s->finished = 1;
137
138 ret = av_expr_parse(&s->zoom_expr, s->zoom_expr_str, var_names, NULL, NULL, NULL, NULL, 0, ctx);
139 if (ret < 0)
140 return ret;
141
142 ret = av_expr_parse(&s->x_expr, s->x_expr_str, var_names, NULL, NULL, NULL, NULL, 0, ctx);
143 if (ret < 0)
144 return ret;
145
146 ret = av_expr_parse(&s->y_expr, s->y_expr_str, var_names, NULL, NULL, NULL, NULL, 0, ctx);
147 if (ret < 0)
148 return ret;
149
150 return 0;
151 }
152
output_single_frame(AVFilterContext * ctx,AVFrame * in,double * var_values,int i,double * zoom,double * dx,double * dy)153 static int output_single_frame(AVFilterContext *ctx, AVFrame *in, double *var_values, int i,
154 double *zoom, double *dx, double *dy)
155 {
156 ZPContext *s = ctx->priv;
157 AVFilterLink *outlink = ctx->outputs[0];
158 int64_t pts = s->frame_count;
159 int k, x, y, w, h, ret = 0;
160 uint8_t *input[4];
161 int px[4], py[4];
162 AVFrame *out;
163
164 var_values[VAR_PX] = s->x;
165 var_values[VAR_PY] = s->y;
166 var_values[VAR_PZOOM] = s->prev_zoom;
167 var_values[VAR_PDURATION] = s->prev_nb_frames;
168 var_values[VAR_TIME] = pts * av_q2d(outlink->time_base);
169 var_values[VAR_FRAME] = i;
170 var_values[VAR_ON] = outlink->frame_count_in;
171
172 *zoom = av_expr_eval(s->zoom_expr, var_values, NULL);
173
174 *zoom = av_clipd(*zoom, 1, 10);
175 var_values[VAR_ZOOM] = *zoom;
176 w = in->width * (1.0 / *zoom);
177 h = in->height * (1.0 / *zoom);
178
179 *dx = av_expr_eval(s->x_expr, var_values, NULL);
180
181 x = *dx = av_clipd(*dx, 0, FFMAX(in->width - w, 0));
182 var_values[VAR_X] = *dx;
183 x &= ~((1 << s->desc->log2_chroma_w) - 1);
184
185 *dy = av_expr_eval(s->y_expr, var_values, NULL);
186
187 y = *dy = av_clipd(*dy, 0, FFMAX(in->height - h, 0));
188 var_values[VAR_Y] = *dy;
189 y &= ~((1 << s->desc->log2_chroma_h) - 1);
190
191 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
192 if (!out) {
193 ret = AVERROR(ENOMEM);
194 return ret;
195 }
196
197 px[1] = px[2] = AV_CEIL_RSHIFT(x, s->desc->log2_chroma_w);
198 px[0] = px[3] = x;
199
200 py[1] = py[2] = AV_CEIL_RSHIFT(y, s->desc->log2_chroma_h);
201 py[0] = py[3] = y;
202
203 s->sws = sws_alloc_context();
204 if (!s->sws) {
205 ret = AVERROR(ENOMEM);
206 goto error;
207 }
208
209 for (k = 0; in->data[k]; k++)
210 input[k] = in->data[k] + py[k] * in->linesize[k] + px[k];
211
212 av_opt_set_int(s->sws, "srcw", w, 0);
213 av_opt_set_int(s->sws, "srch", h, 0);
214 av_opt_set_int(s->sws, "src_format", in->format, 0);
215 av_opt_set_int(s->sws, "dstw", outlink->w, 0);
216 av_opt_set_int(s->sws, "dsth", outlink->h, 0);
217 av_opt_set_int(s->sws, "dst_format", outlink->format, 0);
218 av_opt_set_int(s->sws, "sws_flags", SWS_BICUBIC, 0);
219
220 if ((ret = sws_init_context(s->sws, NULL, NULL)) < 0)
221 goto error;
222
223 sws_scale(s->sws, (const uint8_t *const *)&input, in->linesize, 0, h, out->data, out->linesize);
224
225 out->pts = pts;
226 s->frame_count++;
227
228 ret = ff_filter_frame(outlink, out);
229 sws_freeContext(s->sws);
230 s->sws = NULL;
231 s->current_frame++;
232
233 if (s->current_frame >= s->nb_frames) {
234 if (*dx != -1)
235 s->x = *dx;
236 if (*dy != -1)
237 s->y = *dy;
238 if (*zoom != -1)
239 s->prev_zoom = *zoom;
240 s->prev_nb_frames = s->nb_frames;
241 s->nb_frames = 0;
242 s->current_frame = 0;
243 av_frame_free(&s->in);
244 s->finished = 1;
245 }
246 return ret;
247 error:
248 sws_freeContext(s->sws);
249 s->sws = NULL;
250 av_frame_free(&out);
251 return ret;
252 }
253
activate(AVFilterContext * ctx)254 static int activate(AVFilterContext *ctx)
255 {
256 ZPContext *s = ctx->priv;
257 AVFilterLink *inlink = ctx->inputs[0];
258 AVFilterLink *outlink = ctx->outputs[0];
259 int status, ret = 0;
260 int64_t pts;
261
262 FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
263
264 if (s->in && ff_outlink_frame_wanted(outlink)) {
265 double zoom = -1, dx = -1, dy = -1;
266
267 ret = output_single_frame(ctx, s->in, s->var_values, s->current_frame,
268 &zoom, &dx, &dy);
269 if (ret < 0)
270 return ret;
271 }
272
273 if (!s->in && (ret = ff_inlink_consume_frame(inlink, &s->in)) > 0) {
274 double zoom = -1, dx = -1, dy = -1, nb_frames;
275
276 s->finished = 0;
277 s->var_values[VAR_IN_W] = s->var_values[VAR_IW] = s->in->width;
278 s->var_values[VAR_IN_H] = s->var_values[VAR_IH] = s->in->height;
279 s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = s->w;
280 s->var_values[VAR_OUT_H] = s->var_values[VAR_OH] = s->h;
281 s->var_values[VAR_IN] = inlink->frame_count_out - 1;
282 s->var_values[VAR_ON] = outlink->frame_count_in;
283 s->var_values[VAR_PX] = s->x;
284 s->var_values[VAR_PY] = s->y;
285 s->var_values[VAR_X] = 0;
286 s->var_values[VAR_Y] = 0;
287 s->var_values[VAR_PZOOM] = s->prev_zoom;
288 s->var_values[VAR_ZOOM] = 1;
289 s->var_values[VAR_PDURATION] = s->prev_nb_frames;
290 s->var_values[VAR_A] = (double) s->in->width / s->in->height;
291 s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
292 (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
293 s->var_values[VAR_DAR] = s->var_values[VAR_A] * s->var_values[VAR_SAR];
294 s->var_values[VAR_HSUB] = 1 << s->desc->log2_chroma_w;
295 s->var_values[VAR_VSUB] = 1 << s->desc->log2_chroma_h;
296
297 if ((ret = av_expr_parse_and_eval(&nb_frames, s->duration_expr_str,
298 var_names, s->var_values,
299 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
300 av_frame_free(&s->in);
301 return ret;
302 }
303
304 s->var_values[VAR_DURATION] = s->nb_frames = nb_frames;
305
306 ret = output_single_frame(ctx, s->in, s->var_values, s->current_frame,
307 &zoom, &dx, &dy);
308 if (ret < 0)
309 return ret;
310 }
311 if (ret < 0) {
312 return ret;
313 } else if (s->finished && ff_inlink_acknowledge_status(inlink, &status, &pts)) {
314 ff_outlink_set_status(outlink, status, pts);
315 return 0;
316 } else {
317 if (ff_outlink_frame_wanted(outlink) && s->finished)
318 ff_inlink_request_frame(inlink);
319 return 0;
320 }
321 }
322
query_formats(AVFilterContext * ctx)323 static int query_formats(AVFilterContext *ctx)
324 {
325 static const enum AVPixelFormat pix_fmts[] = {
326 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
327 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
328 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
329 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P,
330 AV_PIX_FMT_YUVA420P,
331 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
332 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
333 AV_PIX_FMT_YUVJ411P,
334 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
335 AV_PIX_FMT_GRAY8,
336 AV_PIX_FMT_NONE
337 };
338
339 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
340 if (!fmts_list)
341 return AVERROR(ENOMEM);
342 return ff_set_common_formats(ctx, fmts_list);
343 }
344
uninit(AVFilterContext * ctx)345 static av_cold void uninit(AVFilterContext *ctx)
346 {
347 ZPContext *s = ctx->priv;
348
349 sws_freeContext(s->sws);
350 s->sws = NULL;
351 av_expr_free(s->x_expr);
352 av_expr_free(s->y_expr);
353 av_expr_free(s->zoom_expr);
354 av_frame_free(&s->in);
355 }
356
357 static const AVFilterPad inputs[] = {
358 {
359 .name = "default",
360 .type = AVMEDIA_TYPE_VIDEO,
361 },
362 { NULL }
363 };
364
365 static const AVFilterPad outputs[] = {
366 {
367 .name = "default",
368 .type = AVMEDIA_TYPE_VIDEO,
369 .config_props = config_output,
370 },
371 { NULL }
372 };
373
374 AVFilter ff_vf_zoompan = {
375 .name = "zoompan",
376 .description = NULL_IF_CONFIG_SMALL("Apply Zoom & Pan effect."),
377 .priv_size = sizeof(ZPContext),
378 .priv_class = &zoompan_class,
379 .init = init,
380 .uninit = uninit,
381 .query_formats = query_formats,
382 .activate = activate,
383 .inputs = inputs,
384 .outputs = outputs,
385 };
386