2 * Copyright (c) 2013 Paul B Mahol
4 * This file is part of FFmpeg.
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.
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.
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
21 #include "libavutil/avassert.h"
22 #include "libavutil/eval.h"
23 #include "libavutil/opt.h"
24 #include "libavutil/pixdesc.h"
30 #include "libswscale/swscale.h"
32 static const char *const var_names[] = {
78 typedef struct ZPcontext {
83 char *duration_expr_str;
85 AVExpr *zoom_expr, *x_expr, *y_expr;
91 struct SwsContext *sws;
93 const AVPixFmtDescriptor *desc;
95 double var_values[VARS_NB];
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 },
115 AVFILTER_DEFINE_CLASS(zoompan);
117 static av_cold int init(AVFilterContext *ctx)
119 ZPContext *s = ctx->priv;
125 static int config_output(AVFilterLink *outlink)
127 AVFilterContext *ctx = outlink->src;
128 ZPContext *s = ctx->priv;
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);
138 ret = av_expr_parse(&s->zoom_expr, s->zoom_expr_str, var_names, NULL, NULL, NULL, NULL, 0, ctx);
142 ret = av_expr_parse(&s->x_expr, s->x_expr_str, var_names, NULL, NULL, NULL, NULL, 0, ctx);
146 ret = av_expr_parse(&s->y_expr, s->y_expr_str, var_names, NULL, NULL, NULL, NULL, 0, ctx);
153 static int output_single_frame(AVFilterContext *ctx, AVFrame *in, double *var_values, int i,
154 double *zoom, double *dx, double *dy)
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;
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;
172 *zoom = av_expr_eval(s->zoom_expr, var_values, NULL);
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);
179 *dx = av_expr_eval(s->x_expr, var_values, NULL);
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);
185 *dy = av_expr_eval(s->y_expr, var_values, NULL);
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);
191 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
193 ret = AVERROR(ENOMEM);
197 px[1] = px[2] = AV_CEIL_RSHIFT(x, s->desc->log2_chroma_w);
200 py[1] = py[2] = AV_CEIL_RSHIFT(y, s->desc->log2_chroma_h);
203 s->sws = sws_alloc_context();
205 ret = AVERROR(ENOMEM);
209 for (k = 0; in->data[k]; k++)
210 input[k] = in->data[k] + py[k] * in->linesize[k] + px[k];
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);
220 if ((ret = sws_init_context(s->sws, NULL, NULL)) < 0)
223 sws_scale(s->sws, (const uint8_t *const *)&input, in->linesize, 0, h, out->data, out->linesize);
228 ret = ff_filter_frame(outlink, out);
229 sws_freeContext(s->sws);
233 if (s->current_frame >= s->nb_frames) {
239 s->prev_zoom = *zoom;
240 s->prev_nb_frames = s->nb_frames;
242 s->current_frame = 0;
243 av_frame_free(&s->in);
252 static int activate(AVFilterContext *ctx)
254 ZPContext *s = ctx->priv;
255 AVFilterLink *inlink = ctx->inputs[0];
256 AVFilterLink *outlink = ctx->outputs[0];
260 if (s->in && ff_outlink_frame_wanted(outlink)) {
261 double zoom = -1, dx = -1, dy = -1;
263 ret = output_single_frame(ctx, s->in, s->var_values, s->current_frame,
269 if (!s->in && (ret = ff_inlink_consume_frame(inlink, &s->in)) > 0) {
270 double zoom = -1, dx = -1, dy = -1, nb_frames;
273 s->var_values[VAR_IN_W] = s->var_values[VAR_IW] = s->in->width;
274 s->var_values[VAR_IN_H] = s->var_values[VAR_IH] = s->in->height;
275 s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = s->w;
276 s->var_values[VAR_OUT_H] = s->var_values[VAR_OH] = s->h;
277 s->var_values[VAR_IN] = inlink->frame_count_out - 1;
278 s->var_values[VAR_ON] = outlink->frame_count_in;
279 s->var_values[VAR_PX] = s->x;
280 s->var_values[VAR_PY] = s->y;
281 s->var_values[VAR_X] = 0;
282 s->var_values[VAR_Y] = 0;
283 s->var_values[VAR_PZOOM] = s->prev_zoom;
284 s->var_values[VAR_ZOOM] = 1;
285 s->var_values[VAR_PDURATION] = s->prev_nb_frames;
286 s->var_values[VAR_A] = (double) s->in->width / s->in->height;
287 s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
288 (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
289 s->var_values[VAR_DAR] = s->var_values[VAR_A] * s->var_values[VAR_SAR];
290 s->var_values[VAR_HSUB] = 1 << s->desc->log2_chroma_w;
291 s->var_values[VAR_VSUB] = 1 << s->desc->log2_chroma_h;
293 if ((ret = av_expr_parse_and_eval(&nb_frames, s->duration_expr_str,
294 var_names, s->var_values,
295 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
296 av_frame_free(&s->in);
300 s->var_values[VAR_DURATION] = s->nb_frames = nb_frames;
302 ret = output_single_frame(ctx, s->in, s->var_values, s->current_frame,
309 } else if (s->finished && ff_inlink_acknowledge_status(inlink, &status, &pts)) {
310 ff_outlink_set_status(outlink, status, pts);
313 if (ff_outlink_frame_wanted(outlink) && s->finished)
314 ff_inlink_request_frame(inlink);
319 static int query_formats(AVFilterContext *ctx)
321 static const enum AVPixelFormat pix_fmts[] = {
322 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
323 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
324 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
325 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P,
327 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
328 AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
330 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
335 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
337 return AVERROR(ENOMEM);
338 return ff_set_common_formats(ctx, fmts_list);
341 static av_cold void uninit(AVFilterContext *ctx)
343 ZPContext *s = ctx->priv;
345 sws_freeContext(s->sws);
349 static const AVFilterPad inputs[] = {
352 .type = AVMEDIA_TYPE_VIDEO,
357 static const AVFilterPad outputs[] = {
360 .type = AVMEDIA_TYPE_VIDEO,
361 .config_props = config_output,
366 AVFilter ff_vf_zoompan = {
368 .description = NULL_IF_CONFIG_SMALL("Apply Zoom & Pan effect."),
369 .priv_size = sizeof(ZPContext),
370 .priv_class = &zoompan_class,
373 .query_formats = query_formats,
374 .activate = activate,