2 * copyright (c) 2007 Bobby Bingham
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
27 #include "libavutil/eval.h"
28 #include "libavutil/avstring.h"
29 #include "libavutil/libm.h"
30 #include "libavcore/imgutils.h"
32 static const char *var_names[] = {
36 "in_w", "iw", ///< width of the input video
37 "in_h", "ih", ///< height of the input video
38 "out_w", "ow", ///< width of the cropped video
39 "out_h", "oh", ///< height of the cropped video
42 "n", ///< number of frame
43 "pos", ///< position in the file
44 "t", ///< timestamp expressed in seconds
65 int x; ///< x offset of the non-cropped area with respect to the input area
66 int y; ///< y offset of the non-cropped area with respect to the input area
67 int w; ///< width of the cropped area
68 int h; ///< height of the cropped area
70 int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
71 int hsub, vsub; ///< chroma subsampling
72 char x_expr[256], y_expr[256], ow_expr[256], oh_expr[256];
73 AVExpr *x_pexpr, *y_pexpr; /* parsed expressions for x and y */
74 double var_values[VARS_NB];
77 static int query_formats(AVFilterContext *ctx)
79 static const enum PixelFormat pix_fmts[] = {
80 PIX_FMT_RGB48BE, PIX_FMT_RGB48LE,
81 PIX_FMT_ARGB, PIX_FMT_RGBA,
82 PIX_FMT_ABGR, PIX_FMT_BGRA,
83 PIX_FMT_RGB24, PIX_FMT_BGR24,
84 PIX_FMT_RGB565BE, PIX_FMT_RGB565LE,
85 PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
86 PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
87 PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
88 PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
89 PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
90 PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE,
91 PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
92 PIX_FMT_YUV444P, PIX_FMT_YUV422P,
93 PIX_FMT_YUV420P, PIX_FMT_YUV411P,
94 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
95 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
96 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
98 PIX_FMT_RGB8, PIX_FMT_BGR8,
99 PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
100 PIX_FMT_PAL8, PIX_FMT_GRAY8,
104 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
109 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
111 CropContext *crop = ctx->priv;
113 av_strlcpy(crop->ow_expr, "iw", sizeof(crop->ow_expr));
114 av_strlcpy(crop->oh_expr, "ih", sizeof(crop->oh_expr));
115 av_strlcpy(crop->x_expr, "(in_w-out_w)/2", sizeof(crop->x_expr));
116 av_strlcpy(crop->y_expr, "(in_h-out_h)/2", sizeof(crop->y_expr));
119 sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]", crop->ow_expr, crop->oh_expr, crop->x_expr, crop->y_expr);
124 static av_cold void uninit(AVFilterContext *ctx)
126 CropContext *crop = ctx->priv;
128 av_free_expr(crop->x_pexpr); crop->x_pexpr = NULL;
129 av_free_expr(crop->y_pexpr); crop->y_pexpr = NULL;
132 static inline int normalize_double(int *n, double d)
137 ret = AVERROR(EINVAL);
138 } else if (d > INT_MAX || d < INT_MIN) {
139 *n = d > INT_MAX ? INT_MAX : INT_MIN;
140 ret = AVERROR(EINVAL);
147 static int config_input(AVFilterLink *link)
149 AVFilterContext *ctx = link->dst;
150 CropContext *crop = ctx->priv;
151 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[link->format];
156 crop->var_values[E] = M_E;
157 crop->var_values[PHI] = M_PHI;
158 crop->var_values[PI] = M_PI;
159 crop->var_values[IN_W] = crop->var_values[IW] = ctx->inputs[0]->w;
160 crop->var_values[IN_H] = crop->var_values[IH] = ctx->inputs[0]->h;
161 crop->var_values[X] = NAN;
162 crop->var_values[Y] = NAN;
163 crop->var_values[OUT_W] = crop->var_values[OW] = NAN;
164 crop->var_values[OUT_H] = crop->var_values[OH] = NAN;
165 crop->var_values[N] = 0;
166 crop->var_values[T] = NAN;
167 crop->var_values[POS] = NAN;
169 av_image_fill_max_pixsteps(crop->max_step, NULL, pix_desc);
170 crop->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w;
171 crop->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
173 if ((ret = av_parse_and_eval_expr(&res, (expr = crop->ow_expr),
174 var_names, crop->var_values,
175 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
176 crop->var_values[OUT_W] = crop->var_values[OW] = res;
177 if ((ret = av_parse_and_eval_expr(&res, (expr = crop->oh_expr),
178 var_names, crop->var_values,
179 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
180 crop->var_values[OUT_H] = crop->var_values[OH] = res;
181 /* evaluate again ow as it may depend on oh */
182 if ((ret = av_parse_and_eval_expr(&res, (expr = crop->ow_expr),
183 var_names, crop->var_values,
184 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
185 crop->var_values[OUT_W] = crop->var_values[OW] = res;
186 if (normalize_double(&crop->w, crop->var_values[OUT_W]) < 0 ||
187 normalize_double(&crop->h, crop->var_values[OUT_H]) < 0) {
188 av_log(ctx, AV_LOG_ERROR,
189 "Too big value or invalid expression for out_w/ow or out_h/oh. "
190 "Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",
191 crop->ow_expr, crop->oh_expr);
192 return AVERROR(EINVAL);
194 crop->w &= ~((1 << crop->hsub) - 1);
195 crop->h &= ~((1 << crop->vsub) - 1);
197 if ((ret = av_parse_expr(&crop->x_pexpr, crop->x_expr, var_names,
198 NULL, NULL, NULL, NULL, 0, ctx)) < 0 ||
199 (ret = av_parse_expr(&crop->y_pexpr, crop->y_expr, var_names,
200 NULL, NULL, NULL, NULL, 0, ctx)) < 0)
201 return AVERROR(EINVAL);
203 if (crop->w <= 0 || crop->h <= 0 ||
204 crop->w > link->w || crop->h > link->h) {
205 av_log(ctx, AV_LOG_ERROR,
206 "Invalid too big or non positive size for width '%d' or height '%d'\n",
208 return AVERROR(EINVAL);
211 /* set default, required in the case the first computed value for x/y is NAN */
212 crop->x = (link->w - crop->w) / 2;
213 crop->y = (link->h - crop->h) / 2;
214 crop->x &= ~((1 << crop->hsub) - 1);
215 crop->y &= ~((1 << crop->vsub) - 1);
219 av_log(NULL, AV_LOG_ERROR, "Error when evaluating the expression '%s'\n", expr);
223 static int config_output(AVFilterLink *link)
225 CropContext *crop = link->src->priv;
233 static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
235 AVFilterContext *ctx = link->dst;
236 CropContext *crop = ctx->priv;
237 AVFilterBufferRef *ref2 = avfilter_ref_buffer(picref, ~0);
240 picref->video->w = crop->w;
241 picref->video->h = crop->h;
243 /* FIXME: when the TB will be settable */
244 crop->var_values[T] = picref->pts == AV_NOPTS_VALUE ? NAN : (double)picref->pts / AV_TIME_BASE;
245 crop->var_values[POS] = picref->pos == -1 ? NAN : picref->pos;
246 crop->var_values[X] = av_eval_expr(crop->x_pexpr, crop->var_values, NULL);
247 crop->var_values[Y] = av_eval_expr(crop->y_pexpr, crop->var_values, NULL);
248 crop->var_values[X] = av_eval_expr(crop->x_pexpr, crop->var_values, NULL);
250 normalize_double(&crop->x, crop->var_values[X]);
251 normalize_double(&crop->y, crop->var_values[Y]);
253 if (crop->x < 0) crop->x = 0;
254 if (crop->y < 0) crop->y = 0;
255 if ((unsigned)crop->x + (unsigned)crop->w > link->w) crop->x = link->w - crop->w;
256 if ((unsigned)crop->y + (unsigned)crop->h > link->h) crop->y = link->h - crop->h;
257 crop->x &= ~((1 << crop->hsub) - 1);
258 crop->y &= ~((1 << crop->vsub) - 1);
260 av_log(ctx, AV_LOG_DEBUG,
261 "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
262 (int)crop->var_values[N], crop->var_values[T], crop->x, crop->y, crop->x+crop->w, crop->y+crop->h);
264 ref2->data[0] += crop->y * ref2->linesize[0];
265 ref2->data[0] += crop->x * crop->max_step[0];
267 if (!(av_pix_fmt_descriptors[link->format].flags & PIX_FMT_PAL)) {
268 for (i = 1; i < 3; i ++) {
270 ref2->data[i] += (crop->y >> crop->vsub) * ref2->linesize[i];
271 ref2->data[i] += (crop->x * crop->max_step[i]) >> crop->hsub;
278 ref2->data[3] += crop->y * ref2->linesize[3];
279 ref2->data[3] += crop->x * crop->max_step[3];
282 avfilter_start_frame(link->dst->outputs[0], ref2);
285 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
287 AVFilterContext *ctx = link->dst;
288 CropContext *crop = ctx->priv;
290 if (y >= crop->y + crop->h || y + h <= crop->y)
297 if (y + h > crop->y + crop->h)
298 h = crop->y + crop->h - y;
300 avfilter_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
303 static void end_frame(AVFilterLink *link)
305 CropContext *crop = link->dst->priv;
307 crop->var_values[N] += 1.0;
308 avfilter_unref_buffer(link->cur_buf);
309 avfilter_end_frame(link->dst->outputs[0]);
312 AVFilter avfilter_vf_crop = {
314 .description = NULL_IF_CONFIG_SMALL("Crop the input video to width:height:x:y."),
316 .priv_size = sizeof(CropContext),
318 .query_formats = query_formats,
322 .inputs = (AVFilterPad[]) {{ .name = "default",
323 .type = AVMEDIA_TYPE_VIDEO,
324 .start_frame = start_frame,
325 .draw_slice = draw_slice,
326 .end_frame = end_frame,
327 .get_video_buffer = avfilter_null_get_video_buffer,
328 .config_props = config_input, },
330 .outputs = (AVFilterPad[]) {{ .name = "default",
331 .type = AVMEDIA_TYPE_VIDEO,
332 .config_props = config_output, },