FFmpeg  4.3.7
f_select.c
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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 "libavutil/avstring.h"
27 #include "libavutil/eval.h"
28 #include "libavutil/fifo.h"
29 #include "libavutil/imgutils.h"
30 #include "libavutil/internal.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/pixdesc.h"
33 #include "avfilter.h"
34 #include "audio.h"
35 #include "formats.h"
36 #include "internal.h"
37 #include "video.h"
38 #include "scene_sad.h"
39 
40 static const char *const var_names[] = {
41  "TB", ///< timebase
42 
43  "pts", ///< original pts in the file of the frame
44  "start_pts", ///< first PTS in the stream, expressed in TB units
45  "prev_pts", ///< previous frame PTS
46  "prev_selected_pts", ///< previous selected frame PTS
47 
48  "t", ///< timestamp expressed in seconds
49  "start_t", ///< first PTS in the stream, expressed in seconds
50  "prev_t", ///< previous frame time
51  "prev_selected_t", ///< previously selected time
52 
53  "pict_type", ///< the type of picture in the movie
54  "I",
55  "P",
56  "B",
57  "S",
58  "SI",
59  "SP",
60  "BI",
61  "PICT_TYPE_I",
62  "PICT_TYPE_P",
63  "PICT_TYPE_B",
64  "PICT_TYPE_S",
65  "PICT_TYPE_SI",
66  "PICT_TYPE_SP",
67  "PICT_TYPE_BI",
68 
69  "interlace_type", ///< the frame interlace type
70  "PROGRESSIVE",
71  "TOPFIRST",
72  "BOTTOMFIRST",
73 
74  "consumed_samples_n",///< number of samples consumed by the filter (only audio)
75  "samples_n", ///< number of samples in the current frame (only audio)
76  "sample_rate", ///< sample rate (only audio)
77 
78  "n", ///< frame number (starting from zero)
79  "selected_n", ///< selected frame number (starting from zero)
80  "prev_selected_n", ///< number of the last selected frame
81 
82  "key", ///< tell if the frame is a key frame
83  "pos", ///< original position in the file of the frame
84 
85  "scene",
86 
87  "concatdec_select", ///< frame is within the interval set by the concat demuxer
88 
89  NULL
90 };
91 
92 enum var_name {
94 
99 
104 
120 
125 
129 
133 
136 
138 
140 
142 };
143 
144 typedef struct SelectContext {
145  const AVClass *class;
146  char *expr_str;
149  int bitdepth;
151  ptrdiff_t width[4];
152  ptrdiff_t height[4];
153  int do_scene_detect; ///< 1 if the expression requires scene detection variables, 0 otherwise
154  ff_scene_sad_fn sad; ///< Sum of the absolute difference function (scene detect only)
155  double prev_mafd; ///< previous MAFD (scene detect only)
156  AVFrame *prev_picref; ///< previous frame (scene detect only)
157  double select;
158  int select_out; ///< mark the selected output pad index
160 } SelectContext;
161 
162 #define OFFSET(x) offsetof(SelectContext, x)
163 #define DEFINE_OPTIONS(filt_name, FLAGS) \
164 static const AVOption filt_name##_options[] = { \
165  { "expr", "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \
166  { "e", "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \
167  { "outputs", "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \
168  { "n", "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \
169  { NULL } \
170 }
171 
172 static int request_frame(AVFilterLink *outlink);
173 
175 {
176  SelectContext *select = ctx->priv;
177  int i, ret;
178 
179  if ((ret = av_expr_parse(&select->expr, select->expr_str,
180  var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
181  av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n",
182  select->expr_str);
183  return ret;
184  }
185  select->do_scene_detect = !!strstr(select->expr_str, "scene");
186 
187  for (i = 0; i < select->nb_outputs; i++) {
188  AVFilterPad pad = { 0 };
189 
190  pad.name = av_asprintf("output%d", i);
191  if (!pad.name)
192  return AVERROR(ENOMEM);
193  pad.type = ctx->filter->inputs[0].type;
195  if ((ret = ff_insert_outpad(ctx, i, &pad)) < 0) {
196  av_freep(&pad.name);
197  return ret;
198  }
199  }
200 
201  return 0;
202 }
203 
204 #define INTERLACE_TYPE_P 0
205 #define INTERLACE_TYPE_T 1
206 #define INTERLACE_TYPE_B 2
207 
208 static int config_input(AVFilterLink *inlink)
209 {
210  SelectContext *select = inlink->dst->priv;
212  int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
213  (desc->flags & AV_PIX_FMT_FLAG_PLANAR) &&
214  desc->nb_components >= 3;
215 
216  select->bitdepth = desc->comp[0].depth;
217  select->nb_planes = is_yuv ? 1 : av_pix_fmt_count_planes(inlink->format);
218 
219  for (int plane = 0; plane < select->nb_planes; plane++) {
220  ptrdiff_t line_size = av_image_get_linesize(inlink->format, inlink->w, plane);
221  int vsub = desc->log2_chroma_h;
222 
223  select->width[plane] = line_size >> (select->bitdepth > 8);
224  select->height[plane] = plane == 1 || plane == 2 ? AV_CEIL_RSHIFT(inlink->h, vsub) : inlink->h;
225  }
226 
227  select->var_values[VAR_N] = 0.0;
228  select->var_values[VAR_SELECTED_N] = 0.0;
229 
230  select->var_values[VAR_TB] = av_q2d(inlink->time_base);
231 
232  select->var_values[VAR_PREV_PTS] = NAN;
235  select->var_values[VAR_PREV_T] = NAN;
236  select->var_values[VAR_START_PTS] = NAN;
237  select->var_values[VAR_START_T] = NAN;
238 
251 
255 
256  select->var_values[VAR_PICT_TYPE] = NAN;
257  select->var_values[VAR_INTERLACE_TYPE] = NAN;
258  select->var_values[VAR_SCENE] = NAN;
260  select->var_values[VAR_SAMPLES_N] = NAN;
261 
262  select->var_values[VAR_SAMPLE_RATE] =
263  inlink->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
264 
265  if (CONFIG_SELECT_FILTER && select->do_scene_detect) {
266  select->sad = ff_scene_sad_get_fn(select->bitdepth == 8 ? 8 : 16);
267  if (!select->sad)
268  return AVERROR(EINVAL);
269  }
270  return 0;
271 }
272 
274 {
275  double ret = 0;
276  SelectContext *select = ctx->priv;
277  AVFrame *prev_picref = select->prev_picref;
278 
279  if (prev_picref &&
280  frame->height == prev_picref->height &&
281  frame->width == prev_picref->width) {
282  uint64_t sad = 0;
283  double mafd, diff;
284  uint64_t count = 0;
285 
286  for (int plane = 0; plane < select->nb_planes; plane++) {
287  uint64_t plane_sad;
288  select->sad(prev_picref->data[plane], prev_picref->linesize[plane],
289  frame->data[plane], frame->linesize[plane],
290  select->width[plane], select->height[plane], &plane_sad);
291  sad += plane_sad;
292  count += select->width[plane] * select->height[plane];
293  }
294 
295  emms_c();
296  mafd = (double)sad / count / (1ULL << (select->bitdepth - 8));
297  diff = fabs(mafd - select->prev_mafd);
298  ret = av_clipf(FFMIN(mafd, diff) / 100., 0, 1);
299  select->prev_mafd = mafd;
300  av_frame_free(&prev_picref);
301  }
302  select->prev_picref = av_frame_clone(frame);
303  return ret;
304 }
305 
306 static double get_concatdec_select(AVFrame *frame, int64_t pts)
307 {
308  AVDictionary *metadata = frame->metadata;
309  AVDictionaryEntry *start_time_entry = av_dict_get(metadata, "lavf.concatdec.start_time", NULL, 0);
310  AVDictionaryEntry *duration_entry = av_dict_get(metadata, "lavf.concatdec.duration", NULL, 0);
311  if (start_time_entry) {
312  int64_t start_time = strtoll(start_time_entry->value, NULL, 10);
313  if (pts >= start_time) {
314  if (duration_entry) {
315  int64_t duration = strtoll(duration_entry->value, NULL, 10);
316  if (pts < start_time + duration)
317  return -1;
318  else
319  return 0;
320  }
321  return -1;
322  }
323  return 0;
324  }
325  return NAN;
326 }
327 
328 #define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
329 #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
330 
332 {
333  SelectContext *select = ctx->priv;
334  AVFilterLink *inlink = ctx->inputs[0];
335  double res;
336 
337  if (isnan(select->var_values[VAR_START_PTS]))
338  select->var_values[VAR_START_PTS] = TS2D(frame->pts);
339  if (isnan(select->var_values[VAR_START_T]))
340  select->var_values[VAR_START_T] = TS2D(frame->pts) * av_q2d(inlink->time_base);
341 
342  select->var_values[VAR_N ] = inlink->frame_count_out;
343  select->var_values[VAR_PTS] = TS2D(frame->pts);
344  select->var_values[VAR_T ] = TS2D(frame->pts) * av_q2d(inlink->time_base);
345  select->var_values[VAR_POS] = frame->pkt_pos == -1 ? NAN : frame->pkt_pos;
346  select->var_values[VAR_KEY] = frame->key_frame;
348 
349  switch (inlink->type) {
350  case AVMEDIA_TYPE_AUDIO:
351  select->var_values[VAR_SAMPLES_N] = frame->nb_samples;
352  break;
353 
354  case AVMEDIA_TYPE_VIDEO:
355  select->var_values[VAR_INTERLACE_TYPE] =
358  select->var_values[VAR_PICT_TYPE] = frame->pict_type;
359  if (select->do_scene_detect) {
360  char buf[32];
361  select->var_values[VAR_SCENE] = get_scene_score(ctx, frame);
362  // TODO: document metadata
363  snprintf(buf, sizeof(buf), "%f", select->var_values[VAR_SCENE]);
364  av_dict_set(&frame->metadata, "lavfi.scene_score", buf, 0);
365  }
366  break;
367  }
368 
369  select->select = res = av_expr_eval(select->expr, select->var_values, NULL);
370  av_log(inlink->dst, AV_LOG_DEBUG,
371  "n:%f pts:%f t:%f key:%d",
372  select->var_values[VAR_N],
373  select->var_values[VAR_PTS],
374  select->var_values[VAR_T],
375  frame->key_frame);
376 
377  switch (inlink->type) {
378  case AVMEDIA_TYPE_VIDEO:
379  av_log(inlink->dst, AV_LOG_DEBUG, " interlace_type:%c pict_type:%c scene:%f",
380  (!frame->interlaced_frame) ? 'P' :
381  frame->top_field_first ? 'T' : 'B',
383  select->var_values[VAR_SCENE]);
384  break;
385  case AVMEDIA_TYPE_AUDIO:
386  av_log(inlink->dst, AV_LOG_DEBUG, " samples_n:%d consumed_samples_n:%f",
387  frame->nb_samples,
389  break;
390  }
391 
392  if (res == 0) {
393  select->select_out = -1; /* drop */
394  } else if (isnan(res) || res < 0) {
395  select->select_out = 0; /* first output */
396  } else {
397  select->select_out = FFMIN(ceilf(res)-1, select->nb_outputs-1); /* other outputs */
398  }
399 
400  av_log(inlink->dst, AV_LOG_DEBUG, " -> select:%f select_out:%d\n", res, select->select_out);
401 
402  if (res) {
403  select->var_values[VAR_PREV_SELECTED_N] = select->var_values[VAR_N];
405  select->var_values[VAR_PREV_SELECTED_T] = select->var_values[VAR_T];
406  select->var_values[VAR_SELECTED_N] += 1.0;
407  if (inlink->type == AVMEDIA_TYPE_AUDIO)
408  select->var_values[VAR_CONSUMED_SAMPLES_N] += frame->nb_samples;
409  }
410 
411  select->var_values[VAR_PREV_PTS] = select->var_values[VAR_PTS];
412  select->var_values[VAR_PREV_T] = select->var_values[VAR_T];
413 }
414 
415 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
416 {
417  AVFilterContext *ctx = inlink->dst;
418  SelectContext *select = ctx->priv;
419 
420  select_frame(ctx, frame);
421  if (select->select)
422  return ff_filter_frame(ctx->outputs[select->select_out], frame);
423 
424  av_frame_free(&frame);
425  return 0;
426 }
427 
428 static int request_frame(AVFilterLink *outlink)
429 {
430  AVFilterLink *inlink = outlink->src->inputs[0];
431  int ret = ff_request_frame(inlink);
432  return ret;
433 }
434 
436 {
437  SelectContext *select = ctx->priv;
438  int i;
439 
440  av_expr_free(select->expr);
441  select->expr = NULL;
442 
443  for (i = 0; i < ctx->nb_outputs; i++)
444  av_freep(&ctx->output_pads[i].name);
445 
446  if (select->do_scene_detect) {
447  av_frame_free(&select->prev_picref);
448  }
449 }
450 
451 #if CONFIG_ASELECT_FILTER
452 
454 AVFILTER_DEFINE_CLASS(aselect);
455 
456 static av_cold int aselect_init(AVFilterContext *ctx)
457 {
458  SelectContext *select = ctx->priv;
459  int ret;
460 
461  if ((ret = init(ctx)) < 0)
462  return ret;
463 
464  if (select->do_scene_detect) {
465  av_log(ctx, AV_LOG_ERROR, "Scene detection is ignored in aselect filter\n");
466  return AVERROR(EINVAL);
467  }
468 
469  return 0;
470 }
471 
472 static const AVFilterPad avfilter_af_aselect_inputs[] = {
473  {
474  .name = "default",
475  .type = AVMEDIA_TYPE_AUDIO,
476  .config_props = config_input,
477  .filter_frame = filter_frame,
478  },
479  { NULL }
480 };
481 
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  .inputs = avfilter_af_aselect_inputs,
489  .priv_class = &aselect_class,
491 };
492 #endif /* CONFIG_ASELECT_FILTER */
493 
494 #if CONFIG_SELECT_FILTER
495 
496 static int query_formats(AVFilterContext *ctx)
497 {
498  SelectContext *select = ctx->priv;
499 
500  if (!select->do_scene_detect) {
501  return ff_default_query_formats(ctx);
502  } else {
503  int ret;
504  static const enum AVPixelFormat pix_fmts[] = {
511  };
512  AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
513 
514  if (!fmts_list)
515  return AVERROR(ENOMEM);
516  ret = ff_set_common_formats(ctx, fmts_list);
517  if (ret < 0)
518  return ret;
519  }
520  return 0;
521 }
522 
525 
526 static av_cold int select_init(AVFilterContext *ctx)
527 {
528  int ret;
529 
530  if ((ret = init(ctx)) < 0)
531  return ret;
532 
533  return 0;
534 }
535 
536 static const AVFilterPad avfilter_vf_select_inputs[] = {
537  {
538  .name = "default",
539  .type = AVMEDIA_TYPE_VIDEO,
540  .config_props = config_input,
541  .filter_frame = filter_frame,
542  },
543  { NULL }
544 };
545 
547  .name = "select",
548  .description = NULL_IF_CONFIG_SMALL("Select video frames to pass in output."),
549  .init = select_init,
550  .uninit = uninit,
551  .query_formats = query_formats,
552  .priv_size = sizeof(SelectContext),
553  .priv_class = &select_class,
554  .inputs = avfilter_vf_select_inputs,
556 };
557 #endif /* CONFIG_SELECT_FILTER */
#define NULL
Definition: coverity.c:32
void(* ff_scene_sad_fn)(SCENE_SAD_PARAMS)
Definition: scene_sad.h:34
int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane)
Compute the size of an image line with format pix_fmt and width width for the plane plane...
Definition: imgutils.c:76
BI type.
Definition: avutil.h:280
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2549
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
int64_t pkt_pos
reordered pos from the last AVPacket that has been input into the decoder
Definition: frame.h:571
static av_cold void uninit(AVFilterContext *ctx)
Definition: f_select.c:435
misc image utilities
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2589
Main libavfilter public API header.
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
ff_scene_sad_fn ff_scene_sad_get_fn(int depth)
Definition: scene_sad.c:59
const char * desc
Definition: nvenc.c:79
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:278
#define INTERLACE_TYPE_P
Definition: f_select.c:204
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:65
int av_expr_parse(AVExpr **expr, const char *s, const char *const *const_names, const char *const *func1_names, double(*const *funcs1)(void *, double), const char *const *func2_names, double(*const *funcs2)(void *, double, double), int log_offset, void *log_ctx)
Parse an expression.
Definition: eval.c:685
static double get_concatdec_select(AVFrame *frame, int64_t pts)
Definition: f_select.c:306
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:300
Switching Intra.
Definition: avutil.h:278
const char * name
Pad name.
Definition: internal.h:60
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:346
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1075
AVFilterPad * output_pads
array of output pads
Definition: avfilter.h:349
static int64_t start_time
Definition: ffplay.c:332
AVComponentDescriptor comp[4]
Parameters that describe how pixels are packed.
Definition: pixdesc.h:117
#define av_cold
Definition: attributes.h:88
ff_scene_sad_fn sad
Sum of the absolute difference function (scene detect only)
Definition: f_select.c:154
AVOptions.
static void select_frame(AVFilterContext *ctx, AVFrame *frame)
Definition: f_select.c:331
#define emms_c()
Definition: internal.h:55
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:393
Definition: eval.c:157
int nb_outputs
Definition: f_select.c:159
#define INTERLACE_TYPE_T
Definition: f_select.c:205
int64_t duration
Definition: movenc.c:63
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:94
static AVFrame * frame
char * expr_str
Definition: f_select.c:146
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:40
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
char av_get_picture_type_char(enum AVPictureType pict_type)
Return a single letter to describe the given picture type pict_type.
Definition: utils.c:88
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
Definition: pixfmt.h:79
AVDictionary * metadata
metadata.
Definition: frame.h:586
int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:447
#define AVFILTER_FLAG_DYNAMIC_OUTPUTS
The number of the filter outputs is not determined just by AVFilter.outputs.
Definition: avfilter.h:111
#define av_log(a,...)
AVFilter ff_vf_select
A filter pad used for either input or output.
Definition: internal.h:54
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
Scene SAD functions.
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
int width
Definition: frame.h:358
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:605
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:101
#define AV_OPT_FLAG_FILTERING_PARAM
a generic parameter which can be set by the user for filtering
Definition: opt.h:292
double var_values[VAR_VARS_NB]
Definition: f_select.c:148
#define AVERROR(e)
Definition: error.h:43
#define AV_PIX_FMT_FLAG_RGB
The pixel format contains RGB-like data (as opposed to YUV/grayscale).
Definition: pixdesc.h:148
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
unsigned nb_outputs
number of output pads
Definition: avfilter.h:351
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:95
void * priv
private data for use by the filter
Definition: avfilter.h:353
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
int select_out
mark the selected output pad index
Definition: f_select.c:158
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:113
var_name
Definition: aeval.c:46
static int config_input(AVFilterLink *inlink)
Definition: f_select.c:208
common internal API header
uint64_t flags
Combination of AV_PIX_FMT_FLAG_...
Definition: pixdesc.h:106
uint8_t nb_components
The number of components each pixel has, (1-4)
Definition: pixdesc.h:83
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:383
#define NAN
Definition: mathematics.h:64
#define FFMIN(a, b)
Definition: common.h:96
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
Definition: pixfmt.h:78
AVFormatContext * ctx
Definition: movenc.c:48
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
ptrdiff_t width[4]
Definition: f_select.c:151
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:541
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: f_select.c:415
const AVFilterPad * inputs
List of inputs, terminated by a zeroed element.
Definition: avfilter.h:164
int ff_default_query_formats(AVFilterContext *ctx)
Definition: formats.c:634
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:336
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:331
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
#define AV_OPT_FLAG_VIDEO_PARAM
Definition: opt.h:279
static double get_scene_score(AVFilterContext *ctx, AVFrame *frame)
Definition: f_select.c:273
a very simple circular buffer FIFO implementation
double prev_mafd
previous MAFD (scene detect only)
Definition: f_select.c:155
AVFilter ff_af_aselect
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:397
Switching Predicted.
Definition: avutil.h:279
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
#define isnan(x)
Definition: libm.h:340
#define TS2D(ts)
Definition: f_select.c:329
#define CONFIG_SELECT_FILTER
Definition: config.h:1960
const char * name
Filter name.
Definition: avfilter.h:148
#define snprintf
Definition: snprintf.h:34
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
static int64_t pts
static int request_frame(AVFilterLink *outlink)
Definition: f_select.c:428
#define flags(name, subs,...)
Definition: cbs_av1.c:565
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
int do_scene_detect
1 if the expression requires scene detection variables, 0 otherwise
Definition: f_select.c:153
AVFrame * prev_picref
previous frame (scene detect only)
Definition: f_select.c:156
#define DEFINE_OPTIONS(filt_name, FLAGS)
Definition: f_select.c:163
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
Y , 8bpp.
Definition: pixfmt.h:74
static int query_formats(AVFilterContext *ctx)
Definition: aeval.c:244
ptrdiff_t height[4]
Definition: f_select.c:152
static av_cold int init(AVFilterContext *ctx)
Definition: f_select.c:174
Bi-dir predicted.
Definition: avutil.h:276
static av_always_inline int diff(const uint32_t a, const uint32_t b)
char * value
Definition: dict.h:87
int top_field_first
If the content is interlaced, is top field displayed first.
Definition: frame.h:452
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:766
#define AVFILTER_DEFINE_CLASS(fname)
Definition: internal.h:314
AVExpr * expr
Definition: f_select.c:147
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:378
A list of supported formats for one end of a filter link.
Definition: formats.h:64
int(* request_frame)(AVFilterLink *link)
Frame request callback.
Definition: internal.h:102
An instance of a filter.
Definition: avfilter.h:338
static const char *const var_names[]
Definition: f_select.c:40
int height
Definition: frame.h:358
#define av_freep(p)
int ff_request_frame(AVFilterLink *link)
Request an input frame from the filter at the other end of the link.
Definition: avfilter.c:407
#define INTERLACE_TYPE_B
Definition: f_select.c:206
internal API functions
int depth
Number of bits in the component.
Definition: pixdesc.h:58
static int ff_insert_outpad(AVFilterContext *f, unsigned index, AVFilterPad *p)
Insert a new output pad for the filter.
Definition: internal.h:274
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
double select
Definition: f_select.c:157
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:366
#define AV_PIX_FMT_FLAG_PLANAR
At least one pixel component is not in the first data plane.
Definition: pixdesc.h:144
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:341
Predicted.
Definition: avutil.h:275
simple arithmetic expression evaluator
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58