FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/f_select.c
Date: 2024-04-20 14:10:07
Exec Total Coverage
Lines: 161 194 83.0%
Functions: 10 11 90.9%
Branches: 62 104 59.6%

Line Branch Exec Source
1 /*
2 * Copyright (c) 2011 Stefano Sabatini
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 /**
22 * @file
23 * filter for selecting which frame passes in the filterchain
24 */
25
26 #include "config_components.h"
27
28 #include "libavutil/avstring.h"
29 #include "libavutil/eval.h"
30 #include "libavutil/fifo.h"
31 #include "libavutil/imgutils.h"
32 #include "libavutil/internal.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/pixdesc.h"
35 #include "avfilter.h"
36 #include "audio.h"
37 #include "formats.h"
38 #include "internal.h"
39 #include "video.h"
40 #include "scene_sad.h"
41
42 static const char *const var_names[] = {
43 "TB", ///< timebase
44
45 "pts", ///< original pts in the file of the frame
46 "start_pts", ///< first PTS in the stream, expressed in TB units
47 "prev_pts", ///< previous frame PTS
48 "prev_selected_pts", ///< previous selected frame PTS
49
50 "t", ///< timestamp expressed in seconds
51 "start_t", ///< first PTS in the stream, expressed in seconds
52 "prev_t", ///< previous frame time
53 "prev_selected_t", ///< previously selected time
54
55 "pict_type", ///< the type of picture in the movie
56 "I",
57 "P",
58 "B",
59 "S",
60 "SI",
61 "SP",
62 "BI",
63 "PICT_TYPE_I",
64 "PICT_TYPE_P",
65 "PICT_TYPE_B",
66 "PICT_TYPE_S",
67 "PICT_TYPE_SI",
68 "PICT_TYPE_SP",
69 "PICT_TYPE_BI",
70
71 "interlace_type", ///< the frame interlace type
72 "PROGRESSIVE",
73 "TOPFIRST",
74 "BOTTOMFIRST",
75
76 "consumed_samples_n",///< number of samples consumed by the filter (only audio)
77 "samples_n", ///< number of samples in the current frame (only audio)
78 "sample_rate", ///< sample rate (only audio)
79
80 "n", ///< frame number (starting from zero)
81 "selected_n", ///< selected frame number (starting from zero)
82 "prev_selected_n", ///< number of the last selected frame
83
84 "key", ///< tell if the frame is a key frame
85 #if FF_API_FRAME_PKT
86 "pos", ///< original position in the file of the frame
87 #endif
88
89 "scene",
90
91 "concatdec_select", ///< frame is within the interval set by the concat demuxer
92
93 NULL
94 };
95
96 enum var_name {
97 VAR_TB,
98
99 VAR_PTS,
100 VAR_START_PTS,
101 VAR_PREV_PTS,
102 VAR_PREV_SELECTED_PTS,
103
104 VAR_T,
105 VAR_START_T,
106 VAR_PREV_T,
107 VAR_PREV_SELECTED_T,
108
109 VAR_PICT_TYPE,
110 VAR_I,
111 VAR_P,
112 VAR_B,
113 VAR_S,
114 VAR_SI,
115 VAR_SP,
116 VAR_BI,
117 VAR_PICT_TYPE_I,
118 VAR_PICT_TYPE_P,
119 VAR_PICT_TYPE_B,
120 VAR_PICT_TYPE_S,
121 VAR_PICT_TYPE_SI,
122 VAR_PICT_TYPE_SP,
123 VAR_PICT_TYPE_BI,
124
125 VAR_INTERLACE_TYPE,
126 VAR_INTERLACE_TYPE_P,
127 VAR_INTERLACE_TYPE_T,
128 VAR_INTERLACE_TYPE_B,
129
130 VAR_CONSUMED_SAMPLES_N,
131 VAR_SAMPLES_N,
132 VAR_SAMPLE_RATE,
133
134 VAR_N,
135 VAR_SELECTED_N,
136 VAR_PREV_SELECTED_N,
137
138 VAR_KEY,
139 #if FF_API_FRAME_PKT
140 VAR_POS,
141 #endif
142
143 VAR_SCENE,
144
145 VAR_CONCATDEC_SELECT,
146
147 VAR_VARS_NB
148 };
149
150 typedef struct SelectContext {
151 const AVClass *class;
152 char *expr_str;
153 AVExpr *expr;
154 double var_values[VAR_VARS_NB];
155 int bitdepth;
156 int nb_planes;
157 ptrdiff_t width[4];
158 ptrdiff_t height[4];
159 int do_scene_detect; ///< 1 if the expression requires scene detection variables, 0 otherwise
160 ff_scene_sad_fn sad; ///< Sum of the absolute difference function (scene detect only)
161 double prev_mafd; ///< previous MAFD (scene detect only)
162 AVFrame *prev_picref; ///< previous frame (scene detect only)
163 double select;
164 int select_out; ///< mark the selected output pad index
165 int nb_outputs;
166 } SelectContext;
167
168 #define OFFSET(x) offsetof(SelectContext, x)
169 #define DEFINE_OPTIONS(filt_name, FLAGS) \
170 static const AVOption filt_name##_options[] = { \
171 { "expr", "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \
172 { "e", "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \
173 { "outputs", "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \
174 { "n", "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \
175 { NULL } \
176 }
177
178 static int request_frame(AVFilterLink *outlink);
179
180 5 static av_cold int init(AVFilterContext *ctx)
181 {
182 5 SelectContext *select = ctx->priv;
183 int i, ret;
184
185
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5 if ((ret = av_expr_parse(&select->expr, select->expr_str,
186 var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
187 av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n",
188 select->expr_str);
189 return ret;
190 }
191 5 select->do_scene_detect = !!strstr(select->expr_str, "scene");
192
193
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10 for (i = 0; i < select->nb_outputs; i++) {
194 5 AVFilterPad pad = { 0 };
195
196 5 pad.name = av_asprintf("output%d", i);
197
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5 if (!pad.name)
198 return AVERROR(ENOMEM);
199 5 pad.type = ctx->filter->inputs[0].type;
200 5 pad.request_frame = request_frame;
201
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5 if ((ret = ff_append_outpad_free_name(ctx, &pad)) < 0)
202 return ret;
203 }
204
205 5 return 0;
206 }
207
208 #define INTERLACE_TYPE_P 0
209 #define INTERLACE_TYPE_T 1
210 #define INTERLACE_TYPE_B 2
211
212 3 static int config_input(AVFilterLink *inlink)
213 {
214 3 SelectContext *select = inlink->dst->priv;
215 3 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
216 9 int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
217
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5 (desc->flags & AV_PIX_FMT_FLAG_PLANAR) &&
218
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2 desc->nb_components >= 3;
219
220 3 select->bitdepth = desc->comp[0].depth;
221
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3 select->nb_planes = is_yuv ? 1 : av_pix_fmt_count_planes(inlink->format);
222
223
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6 for (int plane = 0; plane < select->nb_planes; plane++) {
224 3 ptrdiff_t line_size = av_image_get_linesize(inlink->format, inlink->w, plane);
225 3 int vsub = desc->log2_chroma_h;
226
227 3 select->width[plane] = line_size >> (select->bitdepth > 8);
228
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3 select->height[plane] = plane == 1 || plane == 2 ? AV_CEIL_RSHIFT(inlink->h, vsub) : inlink->h;
229 }
230
231 3 select->var_values[VAR_N] = 0.0;
232 3 select->var_values[VAR_SELECTED_N] = 0.0;
233
234 3 select->var_values[VAR_TB] = av_q2d(inlink->time_base);
235
236 3 select->var_values[VAR_PREV_SELECTED_N] = NAN;
237 3 select->var_values[VAR_PREV_PTS] = NAN;
238 3 select->var_values[VAR_PREV_SELECTED_PTS] = NAN;
239 3 select->var_values[VAR_PREV_SELECTED_T] = NAN;
240 3 select->var_values[VAR_PREV_T] = NAN;
241 3 select->var_values[VAR_START_PTS] = NAN;
242 3 select->var_values[VAR_START_T] = NAN;
243
244 3 select->var_values[VAR_I] = AV_PICTURE_TYPE_I;
245 3 select->var_values[VAR_P] = AV_PICTURE_TYPE_P;
246 3 select->var_values[VAR_B] = AV_PICTURE_TYPE_B;
247 3 select->var_values[VAR_SI] = AV_PICTURE_TYPE_SI;
248 3 select->var_values[VAR_SP] = AV_PICTURE_TYPE_SP;
249 3 select->var_values[VAR_BI] = AV_PICTURE_TYPE_BI;
250 3 select->var_values[VAR_PICT_TYPE_I] = AV_PICTURE_TYPE_I;
251 3 select->var_values[VAR_PICT_TYPE_P] = AV_PICTURE_TYPE_P;
252 3 select->var_values[VAR_PICT_TYPE_B] = AV_PICTURE_TYPE_B;
253 3 select->var_values[VAR_PICT_TYPE_SI] = AV_PICTURE_TYPE_SI;
254 3 select->var_values[VAR_PICT_TYPE_SP] = AV_PICTURE_TYPE_SP;
255 3 select->var_values[VAR_PICT_TYPE_BI] = AV_PICTURE_TYPE_BI;
256
257 3 select->var_values[VAR_INTERLACE_TYPE_P] = INTERLACE_TYPE_P;
258 3 select->var_values[VAR_INTERLACE_TYPE_T] = INTERLACE_TYPE_T;
259 3 select->var_values[VAR_INTERLACE_TYPE_B] = INTERLACE_TYPE_B;
260
261 3 select->var_values[VAR_PICT_TYPE] = NAN;
262 3 select->var_values[VAR_INTERLACE_TYPE] = NAN;
263 3 select->var_values[VAR_SCENE] = NAN;
264 3 select->var_values[VAR_CONSUMED_SAMPLES_N] = NAN;
265 3 select->var_values[VAR_SAMPLES_N] = NAN;
266
267 3 select->var_values[VAR_SAMPLE_RATE] =
268
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3 inlink->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
269
270
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3 if (CONFIG_SELECT_FILTER && select->do_scene_detect) {
271
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1 select->sad = ff_scene_sad_get_fn(select->bitdepth == 8 ? 8 : 16);
272
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1 if (!select->sad)
273 return AVERROR(EINVAL);
274 }
275 3 return 0;
276 }
277
278 1308 static double get_scene_score(AVFilterContext *ctx, AVFrame *frame)
279 {
280 1308 double ret = 0;
281 1308 SelectContext *select = ctx->priv;
282 1308 AVFrame *prev_picref = select->prev_picref;
283
284
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1308 if (prev_picref &&
285
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1307 frame->height == prev_picref->height &&
286
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1307 frame->width == prev_picref->width) {
287 1307 uint64_t sad = 0;
288 double mafd, diff;
289 1307 uint64_t count = 0;
290
291
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2614 for (int plane = 0; plane < select->nb_planes; plane++) {
292 uint64_t plane_sad;
293 1307 select->sad(prev_picref->data[plane], prev_picref->linesize[plane],
294 1307 frame->data[plane], frame->linesize[plane],
295 select->width[plane], select->height[plane], &plane_sad);
296 1307 sad += plane_sad;
297 1307 count += select->width[plane] * select->height[plane];
298 }
299
300 1307 mafd = (double)sad / count / (1ULL << (select->bitdepth - 8));
301 1307 diff = fabs(mafd - select->prev_mafd);
302
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1307 ret = av_clipf(FFMIN(mafd, diff) / 100., 0, 1);
303 1307 select->prev_mafd = mafd;
304 1307 av_frame_free(&prev_picref);
305 }
306 1308 select->prev_picref = av_frame_clone(frame);
307 1308 return ret;
308 }
309
310 1408 static double get_concatdec_select(AVFrame *frame, int64_t pts)
311 {
312 1408 AVDictionary *metadata = frame->metadata;
313 1408 AVDictionaryEntry *start_time_entry = av_dict_get(metadata, "lavf.concatdec.start_time", NULL, 0);
314 1408 AVDictionaryEntry *duration_entry = av_dict_get(metadata, "lavf.concatdec.duration", NULL, 0);
315
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1408 if (start_time_entry) {
316 int64_t start_time = strtoll(start_time_entry->value, NULL, 10);
317 if (pts >= start_time) {
318 if (duration_entry) {
319 int64_t duration = strtoll(duration_entry->value, NULL, 10);
320 if (pts < start_time + duration)
321 return -1;
322 else
323 return 0;
324 }
325 return -1;
326 }
327 return 0;
328 }
329 1408 return NAN;
330 }
331
332 1408 static void select_frame(AVFilterContext *ctx, AVFrame *frame)
333 {
334 1408 SelectContext *select = ctx->priv;
335 1408 AVFilterLink *inlink = ctx->inputs[0];
336 double res;
337
338
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1408 if (isnan(select->var_values[VAR_START_PTS]))
339
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3 select->var_values[VAR_START_PTS] = TS2D(frame->pts);
340
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1408 if (isnan(select->var_values[VAR_START_T]))
341
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3 select->var_values[VAR_START_T] = TS2D(frame->pts) * av_q2d(inlink->time_base);
342
343 1408 select->var_values[VAR_N ] = inlink->frame_count_out;
344
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1408 select->var_values[VAR_PTS] = TS2D(frame->pts);
345
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1408 select->var_values[VAR_T ] = TS2D(frame->pts) * av_q2d(inlink->time_base);
346 #if FF_API_FRAME_PKT
347 FF_DISABLE_DEPRECATION_WARNINGS
348
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1408 select->var_values[VAR_POS] = frame->pkt_pos == -1 ? NAN : frame->pkt_pos;
349 FF_ENABLE_DEPRECATION_WARNINGS
350 #endif
351
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1408 select->var_values[VAR_KEY] = !!(frame->flags & AV_FRAME_FLAG_KEY);
352 1408 select->var_values[VAR_CONCATDEC_SELECT] = get_concatdec_select(frame, av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q));
353
354
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1408 switch (inlink->type) {
355 case AVMEDIA_TYPE_AUDIO:
356 select->var_values[VAR_SAMPLES_N] = frame->nb_samples;
357 break;
358
359 1408 case AVMEDIA_TYPE_VIDEO:
360 1408 select->var_values[VAR_INTERLACE_TYPE] =
361
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1408 !(frame->flags & AV_FRAME_FLAG_INTERLACED) ? INTERLACE_TYPE_P :
362 (frame->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST) ? INTERLACE_TYPE_T : INTERLACE_TYPE_B;
363 1408 select->var_values[VAR_PICT_TYPE] = frame->pict_type;
364
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1408 if (select->do_scene_detect) {
365 char buf[32];
366 1308 select->var_values[VAR_SCENE] = get_scene_score(ctx, frame);
367 // TODO: document metadata
368 1308 snprintf(buf, sizeof(buf), "%f", select->var_values[VAR_SCENE]);
369 1308 av_dict_set(&frame->metadata, "lavfi.scene_score", buf, 0);
370 }
371 1408 break;
372 }
373
374 1408 select->select = res = av_expr_eval(select->expr, select->var_values, NULL);
375 1408 av_log(inlink->dst, AV_LOG_DEBUG,
376 "n:%f pts:%f t:%f key:%d",
377 select->var_values[VAR_N],
378 select->var_values[VAR_PTS],
379 select->var_values[VAR_T],
380 1408 !!(frame->flags & AV_FRAME_FLAG_KEY));
381
382
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1408 switch (inlink->type) {
383 1408 case AVMEDIA_TYPE_VIDEO:
384 1408 av_log(inlink->dst, AV_LOG_DEBUG, " interlace_type:%c pict_type:%c scene:%f",
385
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1408 !(frame->flags & AV_FRAME_FLAG_INTERLACED) ? 'P' :
386 (frame->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST) ? 'T' : 'B',
387 1408 av_get_picture_type_char(frame->pict_type),
388 select->var_values[VAR_SCENE]);
389 1408 break;
390 case AVMEDIA_TYPE_AUDIO:
391 av_log(inlink->dst, AV_LOG_DEBUG, " samples_n:%d consumed_samples_n:%f",
392 frame->nb_samples,
393 select->var_values[VAR_CONSUMED_SAMPLES_N]);
394 break;
395 }
396
397
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1408 if (res == 0) {
398 1355 select->select_out = -1; /* drop */
399
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53 } else if (isnan(res) || res < 0) {
400 select->select_out = 0; /* first output */
401 } else {
402
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53 select->select_out = FFMIN(ceilf(res)-1, select->nb_outputs-1); /* other outputs */
403 }
404
405 1408 av_log(inlink->dst, AV_LOG_DEBUG, " -> select:%f select_out:%d\n", res, select->select_out);
406
407
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1408 if (res) {
408 53 select->var_values[VAR_PREV_SELECTED_N] = select->var_values[VAR_N];
409 53 select->var_values[VAR_PREV_SELECTED_PTS] = select->var_values[VAR_PTS];
410 53 select->var_values[VAR_PREV_SELECTED_T] = select->var_values[VAR_T];
411 53 select->var_values[VAR_SELECTED_N] += 1.0;
412
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53 if (inlink->type == AVMEDIA_TYPE_AUDIO)
413 select->var_values[VAR_CONSUMED_SAMPLES_N] += frame->nb_samples;
414 }
415
416 1408 select->var_values[VAR_PREV_PTS] = select->var_values[VAR_PTS];
417 1408 select->var_values[VAR_PREV_T] = select->var_values[VAR_T];
418 1408 }
419
420 1408 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
421 {
422 1408 AVFilterContext *ctx = inlink->dst;
423 1408 SelectContext *select = ctx->priv;
424
425 1408 select_frame(ctx, frame);
426
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1408 if (select->select)
427 53 return ff_filter_frame(ctx->outputs[select->select_out], frame);
428
429 1355 av_frame_free(&frame);
430 1355 return 0;
431 }
432
433 1412 static int request_frame(AVFilterLink *outlink)
434 {
435 1412 AVFilterLink *inlink = outlink->src->inputs[0];
436 1412 int ret = ff_request_frame(inlink);
437 1412 return ret;
438 }
439
440 5 static av_cold void uninit(AVFilterContext *ctx)
441 {
442 5 SelectContext *select = ctx->priv;
443
444 5 av_expr_free(select->expr);
445 5 select->expr = NULL;
446
447
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5 if (select->do_scene_detect) {
448 1 av_frame_free(&select->prev_picref);
449 }
450 5 }
451
452 #if CONFIG_ASELECT_FILTER
453
454 DEFINE_OPTIONS(aselect, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
455 AVFILTER_DEFINE_CLASS(aselect);
456
457 static av_cold int aselect_init(AVFilterContext *ctx)
458 {
459 SelectContext *select = ctx->priv;
460 int ret;
461
462 if ((ret = init(ctx)) < 0)
463 return ret;
464
465 if (select->do_scene_detect) {
466 av_log(ctx, AV_LOG_ERROR, "Scene detection is ignored in aselect filter\n");
467 return AVERROR(EINVAL);
468 }
469
470 return 0;
471 }
472
473 static const AVFilterPad avfilter_af_aselect_inputs[] = {
474 {
475 .name = "default",
476 .type = AVMEDIA_TYPE_AUDIO,
477 .config_props = config_input,
478 .filter_frame = filter_frame,
479 },
480 };
481
482 const AVFilter ff_af_aselect = {
483 .name = "aselect",
484 .description = NULL_IF_CONFIG_SMALL("Select audio frames to pass in output."),
485 .init = aselect_init,
486 .uninit = uninit,
487 .priv_size = sizeof(SelectContext),
488 FILTER_INPUTS(avfilter_af_aselect_inputs),
489 .priv_class = &aselect_class,
490 .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
491 };
492 #endif /* CONFIG_ASELECT_FILTER */
493
494 #if CONFIG_SELECT_FILTER
495
496 3 static int query_formats(AVFilterContext *ctx)
497 {
498 3 SelectContext *select = ctx->priv;
499
500
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3 if (!select->do_scene_detect) {
501 2 return ff_default_query_formats(ctx);
502 } else {
503 static const enum AVPixelFormat pix_fmts[] = {
504 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, AV_PIX_FMT_RGBA,
505 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, AV_PIX_FMT_GRAY8,
506 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
507 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P,
508 AV_PIX_FMT_YUV420P10,
509 AV_PIX_FMT_NONE
510 };
511 1 return ff_set_common_formats_from_list(ctx, pix_fmts);
512 }
513 }
514
515 DEFINE_OPTIONS(select, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
516 AVFILTER_DEFINE_CLASS(select);
517
518 5 static av_cold int select_init(AVFilterContext *ctx)
519 {
520 int ret;
521
522
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5 if ((ret = init(ctx)) < 0)
523 return ret;
524
525 5 return 0;
526 }
527
528 static const AVFilterPad avfilter_vf_select_inputs[] = {
529 {
530 .name = "default",
531 .type = AVMEDIA_TYPE_VIDEO,
532 .config_props = config_input,
533 .filter_frame = filter_frame,
534 },
535 };
536
537 const AVFilter ff_vf_select = {
538 .name = "select",
539 .description = NULL_IF_CONFIG_SMALL("Select video frames to pass in output."),
540 .init = select_init,
541 .uninit = uninit,
542 .priv_size = sizeof(SelectContext),
543 .priv_class = &select_class,
544 FILTER_INPUTS(avfilter_vf_select_inputs),
545 FILTER_QUERY_FUNC(query_formats),
546 .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS | AVFILTER_FLAG_METADATA_ONLY,
547 };
548 #endif /* CONFIG_SELECT_FILTER */
549