FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/vf_addroi.c
Date: 2024-02-16 17:37:06
Exec Total Coverage
Lines: 0 91 0.0%
Functions: 0 4 0.0%
Branches: 0 33 0.0%

Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "libavutil/avassert.h"
20 #include "libavutil/eval.h"
21 #include "libavutil/opt.h"
22 #include "avfilter.h"
23 #include "internal.h"
24 #include "video.h"
25
26 enum {
27 X, Y, W, H,
28 NB_PARAMS,
29 };
30 static const char addroi_param_names[] = {
31 'x', 'y', 'w', 'h',
32 };
33
34 enum {
35 VAR_IW,
36 VAR_IH,
37 NB_VARS,
38 };
39 static const char *const addroi_var_names[] = {
40 "iw",
41 "ih",
42 };
43
44 typedef struct AddROIContext {
45 const AVClass *class;
46
47 char *region_str[NB_PARAMS];
48 AVExpr *region_expr[NB_PARAMS];
49
50 int region[NB_PARAMS];
51 AVRational qoffset;
52
53 int clear;
54 } AddROIContext;
55
56 static int addroi_config_input(AVFilterLink *inlink)
57 {
58 AVFilterContext *avctx = inlink->dst;
59 AddROIContext *ctx = avctx->priv;
60 int i;
61 double vars[NB_VARS];
62 double val;
63
64 vars[VAR_IW] = inlink->w;
65 vars[VAR_IH] = inlink->h;
66
67 for (i = 0; i < NB_PARAMS; i++) {
68 int max_value;
69 switch (i) {
70 case X: max_value = inlink->w; break;
71 case Y: max_value = inlink->h; break;
72 case W: max_value = inlink->w - ctx->region[X]; break;
73 case H: max_value = inlink->h - ctx->region[Y]; break;
74 }
75
76 val = av_expr_eval(ctx->region_expr[i], vars, NULL);
77 if (val < 0.0) {
78 av_log(avctx, AV_LOG_WARNING, "Calculated value %g for %c is "
79 "less than zero - using zero instead.\n", val,
80 addroi_param_names[i]);
81 val = 0.0;
82 } else if (val > max_value) {
83 av_log(avctx, AV_LOG_WARNING, "Calculated value %g for %c is "
84 "greater than maximum allowed value %d - "
85 "using %d instead.\n", val, addroi_param_names[i],
86 max_value, max_value);
87 val = max_value;
88 }
89 ctx->region[i] = val;
90 }
91
92 return 0;
93 }
94
95 static int addroi_filter_frame(AVFilterLink *inlink, AVFrame *frame)
96 {
97 AVFilterContext *avctx = inlink->dst;
98 AVFilterLink *outlink = avctx->outputs[0];
99 AddROIContext *ctx = avctx->priv;
100 AVRegionOfInterest *roi;
101 AVFrameSideData *sd;
102 int err;
103
104 if (ctx->clear) {
105 av_frame_remove_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST);
106 sd = NULL;
107 } else {
108 sd = av_frame_get_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST);
109 }
110 if (sd) {
111 const AVRegionOfInterest *old_roi;
112 uint32_t old_roi_size;
113 AVBufferRef *roi_ref;
114 int nb_roi, i;
115
116 old_roi = (const AVRegionOfInterest*)sd->data;
117 old_roi_size = old_roi->self_size;
118 av_assert0(old_roi_size && sd->size % old_roi_size == 0);
119 nb_roi = sd->size / old_roi_size + 1;
120
121 roi_ref = av_buffer_alloc(sizeof(*roi) * nb_roi);
122 if (!roi_ref) {
123 err = AVERROR(ENOMEM);
124 goto fail;
125 }
126 roi = (AVRegionOfInterest*)roi_ref->data;
127
128 for (i = 0; i < nb_roi - 1; i++) {
129 old_roi = (const AVRegionOfInterest*)
130 (sd->data + old_roi_size * i);
131
132 roi[i] = (AVRegionOfInterest) {
133 .self_size = sizeof(*roi),
134 .top = old_roi->top,
135 .bottom = old_roi->bottom,
136 .left = old_roi->left,
137 .right = old_roi->right,
138 .qoffset = old_roi->qoffset,
139 };
140 }
141
142 roi[nb_roi - 1] = (AVRegionOfInterest) {
143 .self_size = sizeof(*roi),
144 .top = ctx->region[Y],
145 .bottom = ctx->region[Y] + ctx->region[H],
146 .left = ctx->region[X],
147 .right = ctx->region[X] + ctx->region[W],
148 .qoffset = ctx->qoffset,
149 };
150
151 av_frame_remove_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST);
152
153 sd = av_frame_new_side_data_from_buf(frame,
154 AV_FRAME_DATA_REGIONS_OF_INTEREST,
155 roi_ref);
156 if (!sd) {
157 av_buffer_unref(&roi_ref);
158 err = AVERROR(ENOMEM);
159 goto fail;
160 }
161
162 } else {
163 sd = av_frame_new_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST,
164 sizeof(AVRegionOfInterest));
165 if (!sd) {
166 err = AVERROR(ENOMEM);
167 goto fail;
168 }
169 roi = (AVRegionOfInterest*)sd->data;
170 *roi = (AVRegionOfInterest) {
171 .self_size = sizeof(*roi),
172 .top = ctx->region[Y],
173 .bottom = ctx->region[Y] + ctx->region[H],
174 .left = ctx->region[X],
175 .right = ctx->region[X] + ctx->region[W],
176 .qoffset = ctx->qoffset,
177 };
178 }
179
180 return ff_filter_frame(outlink, frame);
181
182 fail:
183 av_frame_free(&frame);
184 return err;
185 }
186
187 static av_cold int addroi_init(AVFilterContext *avctx)
188 {
189 AddROIContext *ctx = avctx->priv;
190 int i, err;
191
192 for (i = 0; i < NB_PARAMS; i++) {
193 err = av_expr_parse(&ctx->region_expr[i], ctx->region_str[i],
194 addroi_var_names, NULL, NULL, NULL, NULL,
195 0, avctx);
196 if (err < 0) {
197 av_log(ctx, AV_LOG_ERROR,
198 "Error parsing %c expression '%s'.\n",
199 addroi_param_names[i], ctx->region_str[i]);
200 return err;
201 }
202 }
203
204 return 0;
205 }
206
207 static av_cold void addroi_uninit(AVFilterContext *avctx)
208 {
209 AddROIContext *ctx = avctx->priv;
210 int i;
211
212 for (i = 0; i < NB_PARAMS; i++) {
213 av_expr_free(ctx->region_expr[i]);
214 ctx->region_expr[i] = NULL;
215 }
216 }
217
218 #define OFFSET(x) offsetof(AddROIContext, x)
219 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
220 static const AVOption addroi_options[] = {
221 { "x", "Region distance from left edge of frame.",
222 OFFSET(region_str[X]), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
223 { "y", "Region distance from top edge of frame.",
224 OFFSET(region_str[Y]), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
225 { "w", "Region width.",
226 OFFSET(region_str[W]), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
227 { "h", "Region height.",
228 OFFSET(region_str[H]), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
229
230 { "qoffset", "Quantisation offset to apply in the region.",
231 OFFSET(qoffset), AV_OPT_TYPE_RATIONAL, { .dbl = -0.1 }, -1, +1, FLAGS },
232
233 { "clear", "Remove any existing regions of interest before adding the new one.",
234 OFFSET(clear), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
235
236 { NULL }
237 };
238
239 AVFILTER_DEFINE_CLASS(addroi);
240
241 static const AVFilterPad addroi_inputs[] = {
242 {
243 .name = "default",
244 .type = AVMEDIA_TYPE_VIDEO,
245 .config_props = addroi_config_input,
246 .filter_frame = addroi_filter_frame,
247 },
248 };
249
250 const AVFilter ff_vf_addroi = {
251 .name = "addroi",
252 .description = NULL_IF_CONFIG_SMALL("Add region of interest to frame."),
253 .init = addroi_init,
254 .uninit = addroi_uninit,
255
256 .priv_size = sizeof(AddROIContext),
257 .priv_class = &addroi_class,
258
259 .flags = AVFILTER_FLAG_METADATA_ONLY,
260
261 FILTER_INPUTS(addroi_inputs),
262 FILTER_OUTPUTS(ff_video_default_filterpad),
263 };
264