FFmpeg
f_select.c
Go to the documentation of this file.
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_append_outpad_free_name(ctx, &pad)) < 0)
196  return ret;
197  }
198 
199  return 0;
200 }
201 
202 #define INTERLACE_TYPE_P 0
203 #define INTERLACE_TYPE_T 1
204 #define INTERLACE_TYPE_B 2
205 
207 {
208  SelectContext *select = inlink->dst->priv;
210  int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
211  (desc->flags & AV_PIX_FMT_FLAG_PLANAR) &&
212  desc->nb_components >= 3;
213 
214  select->bitdepth = desc->comp[0].depth;
215  select->nb_planes = is_yuv ? 1 : av_pix_fmt_count_planes(inlink->format);
216 
217  for (int plane = 0; plane < select->nb_planes; plane++) {
218  ptrdiff_t line_size = av_image_get_linesize(inlink->format, inlink->w, plane);
219  int vsub = desc->log2_chroma_h;
220 
221  select->width[plane] = line_size >> (select->bitdepth > 8);
222  select->height[plane] = plane == 1 || plane == 2 ? AV_CEIL_RSHIFT(inlink->h, vsub) : inlink->h;
223  }
224 
225  select->var_values[VAR_N] = 0.0;
226  select->var_values[VAR_SELECTED_N] = 0.0;
227 
228  select->var_values[VAR_TB] = av_q2d(inlink->time_base);
229 
230  select->var_values[VAR_PREV_PTS] = NAN;
233  select->var_values[VAR_PREV_T] = NAN;
234  select->var_values[VAR_START_PTS] = NAN;
235  select->var_values[VAR_START_T] = NAN;
236 
249 
253 
254  select->var_values[VAR_PICT_TYPE] = NAN;
255  select->var_values[VAR_INTERLACE_TYPE] = NAN;
256  select->var_values[VAR_SCENE] = NAN;
258  select->var_values[VAR_SAMPLES_N] = NAN;
259 
260  select->var_values[VAR_SAMPLE_RATE] =
261  inlink->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
262 
263  if (CONFIG_SELECT_FILTER && select->do_scene_detect) {
264  select->sad = ff_scene_sad_get_fn(select->bitdepth == 8 ? 8 : 16);
265  if (!select->sad)
266  return AVERROR(EINVAL);
267  }
268  return 0;
269 }
270 
272 {
273  double ret = 0;
274  SelectContext *select = ctx->priv;
275  AVFrame *prev_picref = select->prev_picref;
276 
277  if (prev_picref &&
278  frame->height == prev_picref->height &&
279  frame->width == prev_picref->width) {
280  uint64_t sad = 0;
281  double mafd, diff;
282  uint64_t count = 0;
283 
284  for (int plane = 0; plane < select->nb_planes; plane++) {
285  uint64_t plane_sad;
286  select->sad(prev_picref->data[plane], prev_picref->linesize[plane],
287  frame->data[plane], frame->linesize[plane],
288  select->width[plane], select->height[plane], &plane_sad);
289  sad += plane_sad;
290  count += select->width[plane] * select->height[plane];
291  }
292 
293  emms_c();
294  mafd = (double)sad / count / (1ULL << (select->bitdepth - 8));
295  diff = fabs(mafd - select->prev_mafd);
296  ret = av_clipf(FFMIN(mafd, diff) / 100., 0, 1);
297  select->prev_mafd = mafd;
298  av_frame_free(&prev_picref);
299  }
300  select->prev_picref = av_frame_clone(frame);
301  return ret;
302 }
303 
304 static double get_concatdec_select(AVFrame *frame, int64_t pts)
305 {
306  AVDictionary *metadata = frame->metadata;
307  AVDictionaryEntry *start_time_entry = av_dict_get(metadata, "lavf.concatdec.start_time", NULL, 0);
308  AVDictionaryEntry *duration_entry = av_dict_get(metadata, "lavf.concatdec.duration", NULL, 0);
309  if (start_time_entry) {
310  int64_t start_time = strtoll(start_time_entry->value, NULL, 10);
311  if (pts >= start_time) {
312  if (duration_entry) {
313  int64_t duration = strtoll(duration_entry->value, NULL, 10);
314  if (pts < start_time + duration)
315  return -1;
316  else
317  return 0;
318  }
319  return -1;
320  }
321  return 0;
322  }
323  return NAN;
324 }
325 
327 {
328  SelectContext *select = ctx->priv;
329  AVFilterLink *inlink = ctx->inputs[0];
330  double res;
331 
332  if (isnan(select->var_values[VAR_START_PTS]))
333  select->var_values[VAR_START_PTS] = TS2D(frame->pts);
334  if (isnan(select->var_values[VAR_START_T]))
335  select->var_values[VAR_START_T] = TS2D(frame->pts) * av_q2d(inlink->time_base);
336 
337  select->var_values[VAR_N ] = inlink->frame_count_out;
338  select->var_values[VAR_PTS] = TS2D(frame->pts);
339  select->var_values[VAR_T ] = TS2D(frame->pts) * av_q2d(inlink->time_base);
340  select->var_values[VAR_POS] = frame->pkt_pos == -1 ? NAN : frame->pkt_pos;
341  select->var_values[VAR_KEY] = frame->key_frame;
343 
344  switch (inlink->type) {
345  case AVMEDIA_TYPE_AUDIO:
346  select->var_values[VAR_SAMPLES_N] = frame->nb_samples;
347  break;
348 
349  case AVMEDIA_TYPE_VIDEO:
350  select->var_values[VAR_INTERLACE_TYPE] =
351  !frame->interlaced_frame ? INTERLACE_TYPE_P :
352  frame->top_field_first ? INTERLACE_TYPE_T : INTERLACE_TYPE_B;
353  select->var_values[VAR_PICT_TYPE] = frame->pict_type;
354  if (select->do_scene_detect) {
355  char buf[32];
357  // TODO: document metadata
358  snprintf(buf, sizeof(buf), "%f", select->var_values[VAR_SCENE]);
359  av_dict_set(&frame->metadata, "lavfi.scene_score", buf, 0);
360  }
361  break;
362  }
363 
364  select->select = res = av_expr_eval(select->expr, select->var_values, NULL);
365  av_log(inlink->dst, AV_LOG_DEBUG,
366  "n:%f pts:%f t:%f key:%d",
367  select->var_values[VAR_N],
368  select->var_values[VAR_PTS],
369  select->var_values[VAR_T],
370  frame->key_frame);
371 
372  switch (inlink->type) {
373  case AVMEDIA_TYPE_VIDEO:
374  av_log(inlink->dst, AV_LOG_DEBUG, " interlace_type:%c pict_type:%c scene:%f",
375  (!frame->interlaced_frame) ? 'P' :
376  frame->top_field_first ? 'T' : 'B',
377  av_get_picture_type_char(frame->pict_type),
378  select->var_values[VAR_SCENE]);
379  break;
380  case AVMEDIA_TYPE_AUDIO:
381  av_log(inlink->dst, AV_LOG_DEBUG, " samples_n:%d consumed_samples_n:%f",
382  frame->nb_samples,
384  break;
385  }
386 
387  if (res == 0) {
388  select->select_out = -1; /* drop */
389  } else if (isnan(res) || res < 0) {
390  select->select_out = 0; /* first output */
391  } else {
392  select->select_out = FFMIN(ceilf(res)-1, select->nb_outputs-1); /* other outputs */
393  }
394 
395  av_log(inlink->dst, AV_LOG_DEBUG, " -> select:%f select_out:%d\n", res, select->select_out);
396 
397  if (res) {
398  select->var_values[VAR_PREV_SELECTED_N] = select->var_values[VAR_N];
400  select->var_values[VAR_PREV_SELECTED_T] = select->var_values[VAR_T];
401  select->var_values[VAR_SELECTED_N] += 1.0;
402  if (inlink->type == AVMEDIA_TYPE_AUDIO)
403  select->var_values[VAR_CONSUMED_SAMPLES_N] += frame->nb_samples;
404  }
405 
406  select->var_values[VAR_PREV_PTS] = select->var_values[VAR_PTS];
407  select->var_values[VAR_PREV_T] = select->var_values[VAR_T];
408 }
409 
411 {
412  AVFilterContext *ctx = inlink->dst;
413  SelectContext *select = ctx->priv;
414 
416  if (select->select)
417  return ff_filter_frame(ctx->outputs[select->select_out], frame);
418 
420  return 0;
421 }
422 
423 static int request_frame(AVFilterLink *outlink)
424 {
425  AVFilterLink *inlink = outlink->src->inputs[0];
426  int ret = ff_request_frame(inlink);
427  return ret;
428 }
429 
431 {
432  SelectContext *select = ctx->priv;
433 
434  av_expr_free(select->expr);
435  select->expr = NULL;
436 
437  if (select->do_scene_detect) {
438  av_frame_free(&select->prev_picref);
439  }
440 }
441 
442 #if CONFIG_ASELECT_FILTER
443 
445 AVFILTER_DEFINE_CLASS(aselect);
446 
447 static av_cold int aselect_init(AVFilterContext *ctx)
448 {
449  SelectContext *select = ctx->priv;
450  int ret;
451 
452  if ((ret = init(ctx)) < 0)
453  return ret;
454 
455  if (select->do_scene_detect) {
456  av_log(ctx, AV_LOG_ERROR, "Scene detection is ignored in aselect filter\n");
457  return AVERROR(EINVAL);
458  }
459 
460  return 0;
461 }
462 
463 static const AVFilterPad avfilter_af_aselect_inputs[] = {
464  {
465  .name = "default",
466  .type = AVMEDIA_TYPE_AUDIO,
467  .config_props = config_input,
468  .filter_frame = filter_frame,
469  },
470 };
471 
472 const AVFilter ff_af_aselect = {
473  .name = "aselect",
474  .description = NULL_IF_CONFIG_SMALL("Select audio frames to pass in output."),
475  .init = aselect_init,
476  .uninit = uninit,
477  .priv_size = sizeof(SelectContext),
478  FILTER_INPUTS(avfilter_af_aselect_inputs),
479  .priv_class = &aselect_class,
481 };
482 #endif /* CONFIG_ASELECT_FILTER */
483 
484 #if CONFIG_SELECT_FILTER
485 
486 static int query_formats(AVFilterContext *ctx)
487 {
488  SelectContext *select = ctx->priv;
489 
490  if (!select->do_scene_detect) {
492  } else {
493  static const enum AVPixelFormat pix_fmts[] = {
500  };
502  }
503 }
504 
506 AVFILTER_DEFINE_CLASS(select);
507 
508 static av_cold int select_init(AVFilterContext *ctx)
509 {
510  int ret;
511 
512  if ((ret = init(ctx)) < 0)
513  return ret;
514 
515  return 0;
516 }
517 
518 static const AVFilterPad avfilter_vf_select_inputs[] = {
519  {
520  .name = "default",
521  .type = AVMEDIA_TYPE_VIDEO,
522  .config_props = config_input,
523  .filter_frame = filter_frame,
524  },
525 };
526 
527 const AVFilter ff_vf_select = {
528  .name = "select",
529  .description = NULL_IF_CONFIG_SMALL("Select video frames to pass in output."),
530  .init = select_init,
531  .uninit = uninit,
532  .query_formats = query_formats,
533  .priv_size = sizeof(SelectContext),
534  .priv_class = &select_class,
535  FILTER_INPUTS(avfilter_vf_select_inputs),
537 };
538 #endif /* CONFIG_SELECT_FILTER */
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
VAR_PICT_TYPE_S
@ VAR_PICT_TYPE_S
Definition: f_select.c:116
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
AV_OPT_FLAG_VIDEO_PARAM
#define AV_OPT_FLAG_VIDEO_PARAM
Definition: opt.h:280
VAR_INTERLACE_TYPE_P
@ VAR_INTERLACE_TYPE_P
Definition: f_select.c:122
VAR_P
@ VAR_P
Definition: f_select.c:107
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1019
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2564
request_frame
static int request_frame(AVFilterLink *outlink)
Definition: f_select.c:423
AV_TIME_BASE_Q
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
SelectContext
Definition: f_select.c:144
inlink
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
Definition: filter_design.txt:212
av_asprintf
char * av_asprintf(const char *fmt,...)
Definition: avstring.c:113
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:112
VAR_PREV_T
@ VAR_PREV_T
Definition: f_select.c:102
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
get_concatdec_select
static double get_concatdec_select(AVFrame *frame, int64_t pts)
Definition: f_select.c:304
pixdesc.h
AVFrame::width
int width
Definition: frame.h:361
VAR_INTERLACE_TYPE_B
@ VAR_INTERLACE_TYPE_B
Definition: f_select.c:124
VAR_T
@ VAR_T
Definition: f_select.c:100
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: f_select.c:430
AV_PIX_FMT_YUV420P10
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:391
ff_request_frame
int ff_request_frame(AVFilterLink *link)
Request an input frame from the filter at the other end of the link.
Definition: avfilter.c:421
VAR_START_T
@ VAR_START_T
Definition: f_select.c:101
AV_PIX_FMT_BGR24
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
AV_PIX_FMT_BGRA
@ AV_PIX_FMT_BGRA
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:95
AVDictionary
Definition: dict.c:30
VAR_POS
@ VAR_POS
Definition: f_select.c:135
VAR_SAMPLE_RATE
@ VAR_SAMPLE_RATE
Definition: f_select.c:128
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:153
SelectContext::sad
ff_scene_sad_fn sad
Sum of the absolute difference function (scene detect only)
Definition: f_select.c:154
video.h
AV_OPT_FLAG_FILTERING_PARAM
#define AV_OPT_FLAG_FILTERING_PARAM
a generic parameter which can be set by the user for filtering
Definition: opt.h:293
VAR_SCENE
@ VAR_SCENE
Definition: f_select.c:137
VAR_CONSUMED_SAMPLES_N
@ VAR_CONSUMED_SAMPLES_N
Definition: f_select.c:126
ceilf
static __device__ float ceilf(float a)
Definition: cuda_runtime.h:175
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
formats.h
av_expr_parse
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
VAR_PREV_SELECTED_N
@ VAR_PREV_SELECTED_N
Definition: f_select.c:132
av_pix_fmt_count_planes
int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2604
fifo.h
VAR_SAMPLES_N
@ VAR_SAMPLES_N
Definition: f_select.c:127
VAR_START_PTS
@ VAR_START_PTS
Definition: f_select.c:96
VAR_PICT_TYPE_P
@ VAR_PICT_TYPE_P
Definition: f_select.c:114
pts
static int64_t pts
Definition: transcode_aac.c:653
av_expr_free
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:336
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:50
VAR_BI
@ VAR_BI
Definition: f_select.c:112
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
SelectContext::width
ptrdiff_t width[4]
Definition: f_select.c:151
AVFilterPad::request_frame
int(* request_frame)(AVFilterLink *link)
Frame request callback.
Definition: internal.h:114
av_cold
#define av_cold
Definition: attributes.h:90
duration
int64_t duration
Definition: movenc.c:64
av_dict_get
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
AV_PIX_FMT_YUVJ422P
@ AV_PIX_FMT_YUVJ422P
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
Definition: pixfmt.h:79
get_scene_score
static double get_scene_score(AVFilterContext *ctx, AVFrame *frame)
Definition: f_select.c:271
INTERLACE_TYPE_T
#define INTERLACE_TYPE_T
Definition: f_select.c:203
VAR_SI
@ VAR_SI
Definition: f_select.c:110
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:51
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
VAR_PREV_SELECTED_PTS
@ VAR_PREV_SELECTED_PTS
Definition: f_select.c:98
av_q2d
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
ff_set_common_formats_from_list
int ff_set_common_formats_from_list(AVFilterContext *ctx, const int *fmts)
Equivalent to ff_set_common_formats(ctx, ff_make_format_list(fmts))
Definition: formats.c:698
VAR_PICT_TYPE
@ VAR_PICT_TYPE
Definition: f_select.c:105
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:290
var_name
var_name
Definition: noise_bsf.c:47
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
ctx
AVFormatContext * ctx
Definition: movenc.c:48
av_expr_eval
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:766
av_frame_clone
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:424
av_rescale_q
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:141
AVExpr
Definition: eval.c:157
SelectContext::select_out
int select_out
mark the selected output pad index
Definition: f_select.c:158
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
VAR_PREV_SELECTED_T
@ VAR_PREV_SELECTED_T
Definition: f_select.c:103
NAN
#define NAN
Definition: mathematics.h:64
FILTER_INPUTS
#define FILTER_INPUTS(array)
Definition: internal.h:152
AV_PIX_FMT_RGBA
@ AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
AV_OPT_FLAG_AUDIO_PARAM
#define AV_OPT_FLAG_AUDIO_PARAM
Definition: opt.h:279
INTERLACE_TYPE_B
#define INTERLACE_TYPE_B
Definition: f_select.c:204
ff_scene_sad_get_fn
ff_scene_sad_fn ff_scene_sad_get_fn(int depth)
Definition: scene_sad.c:59
VAR_N
@ VAR_N
Definition: f_select.c:130
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
fabs
static __device__ float fabs(float a)
Definition: cuda_runtime.h:182
TS2D
#define TS2D(ts)
Definition: internal.h:224
NULL
#define NULL
Definition: coverity.c:32
ff_af_aselect
const AVFilter ff_af_aselect
isnan
#define isnan(x)
Definition: libm.h:340
AV_PIX_FMT_YUVJ420P
@ AV_PIX_FMT_YUVJ420P
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
Definition: pixfmt.h:78
AVFilterContext::inputs
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:354
av_clipf
#define av_clipf
Definition: common.h:144
AV_PICTURE_TYPE_SI
@ AV_PICTURE_TYPE_SI
Switching Intra.
Definition: avutil.h:278
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
SelectContext::select
double select
Definition: f_select.c:157
SelectContext::prev_picref
AVFrame * prev_picref
previous frame (scene detect only)
Definition: f_select.c:156
DEFINE_OPTIONS
#define DEFINE_OPTIONS(filt_name, FLAGS)
Definition: f_select.c:163
init
static av_cold int init(AVFilterContext *ctx)
Definition: f_select.c:174
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
AV_PICTURE_TYPE_SP
@ AV_PICTURE_TYPE_SP
Switching Predicted.
Definition: avutil.h:279
AV_PIX_FMT_ABGR
@ AV_PIX_FMT_ABGR
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:94
SelectContext::prev_mafd
double prev_mafd
previous MAFD (scene detect only)
Definition: f_select.c:155
SelectContext::do_scene_detect
int do_scene_detect
1 if the expression requires scene detection variables, 0 otherwise
Definition: f_select.c:153
scene_sad.h
AVFILTER_FLAG_DYNAMIC_OUTPUTS
#define AVFILTER_FLAG_DYNAMIC_OUTPUTS
The number of the filter outputs is not determined just by AVFilter.outputs.
Definition: avfilter.h:116
config_input
static int config_input(AVFilterLink *inlink)
Definition: f_select.c:206
eval.h
AV_PIX_FMT_RGB24
@ AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
ff_default_query_formats
int ff_default_query_formats(AVFilterContext *ctx)
Definition: formats.c:703
AV_PIX_FMT_FLAG_RGB
#define AV_PIX_FMT_FLAG_RGB
The pixel format contains RGB-like data (as opposed to YUV/grayscale).
Definition: pixdesc.h:136
start_time
static int64_t start_time
Definition: ffplay.c:330
VAR_INTERLACE_TYPE
@ VAR_INTERLACE_TYPE
Definition: f_select.c:121
VAR_VARS_NB
@ VAR_VARS_NB
Definition: f_select.c:141
ff_scene_sad_fn
void(* ff_scene_sad_fn)(SCENE_SAD_PARAMS)
Definition: scene_sad.h:34
var_names
static const char *const var_names[]
Definition: f_select.c:40
SelectContext::expr
AVExpr * expr
Definition: f_select.c:147
internal.h
AVFILTER_DEFINE_CLASS
#define AVFILTER_DEFINE_CLASS(fname)
Definition: internal.h:289
av_image_get_linesize
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
av_get_picture_type_char
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
VAR_TB
@ VAR_TB
Definition: f_select.c:93
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
SelectContext::expr_str
char * expr_str
Definition: f_select.c:146
internal.h
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: f_select.c:410
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
SelectContext::nb_planes
int nb_planes
Definition: f_select.c:150
VAR_PICT_TYPE_SI
@ VAR_PICT_TYPE_SI
Definition: f_select.c:117
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:56
SelectContext::bitdepth
int bitdepth
Definition: f_select.c:149
select_frame
static void select_frame(AVFilterContext *ctx, AVFrame *frame)
Definition: f_select.c:326
VAR_B
@ VAR_B
Definition: f_select.c:108
AVFilter
Filter definition.
Definition: avfilter.h:149
VAR_PICT_TYPE_BI
@ VAR_PICT_TYPE_BI
Definition: f_select.c:119
ret
ret
Definition: filter_design.txt:187
AVFilterPad::type
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:61
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
VAR_KEY
@ VAR_KEY
Definition: f_select.c:134
VAR_SELECTED_N
@ VAR_SELECTED_N
Definition: f_select.c:131
SelectContext::var_values
double var_values[VAR_VARS_NB]
Definition: f_select.c:148
SelectContext::nb_outputs
int nb_outputs
Definition: f_select.c:159
AVFrame::height
int height
Definition: frame.h:361
VAR_S
@ VAR_S
Definition: f_select.c:109
AV_PICTURE_TYPE_B
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:276
VAR_PICT_TYPE_I
@ VAR_PICT_TYPE_I
Definition: f_select.c:113
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
VAR_PREV_PTS
@ VAR_PREV_PTS
Definition: f_select.c:97
avfilter.h
VAR_SP
@ VAR_SP
Definition: f_select.c:111
AV_PIX_FMT_FLAG_PLANAR
#define AV_PIX_FMT_FLAG_PLANAR
At least one pixel component is not in the first data plane.
Definition: pixdesc.h:132
VAR_PICT_TYPE_SP
@ VAR_PICT_TYPE_SP
Definition: f_select.c:118
AVFilterContext
An instance of a filter.
Definition: avfilter.h:346
desc
const char * desc
Definition: libsvtav1.c:79
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:275
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AV_PIX_FMT_YUV422P
@ AV_PIX_FMT_YUV422P
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
audio.h
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
diff
static av_always_inline int diff(const uint32_t a, const uint32_t b)
Definition: vf_palettegen.c:136
AVDictionaryEntry
Definition: dict.h:79
VAR_PTS
@ VAR_PTS
Definition: f_select.c:95
ff_append_outpad_free_name
int ff_append_outpad_free_name(AVFilterContext *f, AVFilterPad *p)
Definition: avfilter.c:156
av_dict_set
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
AV_PICTURE_TYPE_BI
@ AV_PICTURE_TYPE_BI
BI type.
Definition: avutil.h:280
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: aeval.c:244
SelectContext::height
ptrdiff_t height[4]
Definition: f_select.c:152
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVDictionaryEntry::value
char * value
Definition: dict.h:81
avstring.h
VAR_PICT_TYPE_B
@ VAR_PICT_TYPE_B
Definition: f_select.c:115
VAR_INTERLACE_TYPE_T
@ VAR_INTERLACE_TYPE_T
Definition: f_select.c:123
ff_vf_select
const AVFilter ff_vf_select
snprintf
#define snprintf
Definition: snprintf.h:34
VAR_I
@ VAR_I
Definition: f_select.c:106
VAR_CONCATDEC_SELECT
@ VAR_CONCATDEC_SELECT
Definition: f_select.c:139
INTERLACE_TYPE_P
#define INTERLACE_TYPE_P
Definition: f_select.c:202