FFmpeg
f_drawgraph.c
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1 /*
2  * Copyright (c) 2015 Paul B Mahol
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 #include "float.h"
22 
23 #include "libavutil/avstring.h"
24 #include "libavutil/eval.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/opt.h"
27 #include "avfilter.h"
28 #include "formats.h"
29 #include "internal.h"
30 #include "video.h"
31 
32 typedef struct DrawGraphContext {
33  const AVClass *class;
34 
35  char *key[4];
36  float min, max;
37  char *fg_str[4];
39  uint8_t bg[4];
40  int mode;
41  int slide;
42  int w, h;
43 
45  int x;
46  int prev_y[4];
47  int first[4];
48  float *values[4];
49  int values_size[4];
50  int nb_values;
52 
53 #define OFFSET(x) offsetof(DrawGraphContext, x)
54 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
55 
56 static const AVOption drawgraph_options[] = {
57  { "m1", "set 1st metadata key", OFFSET(key[0]), AV_OPT_TYPE_STRING, {.str=""}, CHAR_MIN, CHAR_MAX, FLAGS },
58  { "fg1", "set 1st foreground color expression", OFFSET(fg_str[0]), AV_OPT_TYPE_STRING, {.str="0xffff0000"}, CHAR_MIN, CHAR_MAX, FLAGS },
59  { "m2", "set 2nd metadata key", OFFSET(key[1]), AV_OPT_TYPE_STRING, {.str=""}, CHAR_MIN, CHAR_MAX, FLAGS },
60  { "fg2", "set 2nd foreground color expression", OFFSET(fg_str[1]), AV_OPT_TYPE_STRING, {.str="0xff00ff00"}, CHAR_MIN, CHAR_MAX, FLAGS },
61  { "m3", "set 3rd metadata key", OFFSET(key[2]), AV_OPT_TYPE_STRING, {.str=""}, CHAR_MIN, CHAR_MAX, FLAGS },
62  { "fg3", "set 3rd foreground color expression", OFFSET(fg_str[2]), AV_OPT_TYPE_STRING, {.str="0xffff00ff"}, CHAR_MIN, CHAR_MAX, FLAGS },
63  { "m4", "set 4th metadata key", OFFSET(key[3]), AV_OPT_TYPE_STRING, {.str=""}, CHAR_MIN, CHAR_MAX, FLAGS },
64  { "fg4", "set 4th foreground color expression", OFFSET(fg_str[3]), AV_OPT_TYPE_STRING, {.str="0xffffff00"}, CHAR_MIN, CHAR_MAX, FLAGS },
65  { "bg", "set background color", OFFSET(bg), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS },
66  { "min", "set minimal value", OFFSET(min), AV_OPT_TYPE_FLOAT, {.dbl=-1.}, INT_MIN, INT_MAX, FLAGS },
67  { "max", "set maximal value", OFFSET(max), AV_OPT_TYPE_FLOAT, {.dbl=1.}, INT_MIN, INT_MAX, FLAGS },
68  { "mode", "set graph mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=2}, 0, 2, FLAGS, "mode" },
69  {"bar", "draw bars", OFFSET(mode), AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode"},
70  {"dot", "draw dots", OFFSET(mode), AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode"},
71  {"line", "draw lines", OFFSET(mode), AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "mode"},
72  { "slide", "set slide mode", OFFSET(slide), AV_OPT_TYPE_INT, {.i64=0}, 0, 4, FLAGS, "slide" },
73  {"frame", "draw new frames", OFFSET(slide), AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "slide"},
74  {"replace", "replace old columns with new", OFFSET(slide), AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "slide"},
75  {"scroll", "scroll from right to left", OFFSET(slide), AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "slide"},
76  {"rscroll", "scroll from left to right", OFFSET(slide), AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, FLAGS, "slide"},
77  {"picture", "display graph in single frame", OFFSET(slide), AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, FLAGS, "slide"},
78  { "size", "set graph size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="900x256"}, 0, 0, FLAGS },
79  { "s", "set graph size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="900x256"}, 0, 0, FLAGS },
80  { NULL }
81 };
82 
83 static const char *const var_names[] = { "MAX", "MIN", "VAL", NULL };
85 
87 {
88  DrawGraphContext *s = ctx->priv;
89  int ret, i;
90 
91  if (s->max <= s->min) {
92  av_log(ctx, AV_LOG_ERROR, "max is same or lower than min\n");
93  return AVERROR(EINVAL);
94  }
95 
96  for (i = 0; i < 4; i++) {
97  if (s->fg_str[i]) {
98  ret = av_expr_parse(&s->fg_expr[i], s->fg_str[i], var_names,
99  NULL, NULL, NULL, NULL, 0, ctx);
100 
101  if (ret < 0)
102  return ret;
103  }
104  }
105 
106  s->first[0] = s->first[1] = s->first[2] = s->first[3] = 1;
107 
108  if (s->slide == 4) {
109  s->values[0] = av_fast_realloc(NULL, &s->values_size[0], 2000);
110  s->values[1] = av_fast_realloc(NULL, &s->values_size[1], 2000);
111  s->values[2] = av_fast_realloc(NULL, &s->values_size[2], 2000);
112  s->values[3] = av_fast_realloc(NULL, &s->values_size[3], 2000);
113 
114  if (!s->values[0] || !s->values[1] ||
115  !s->values[2] || !s->values[3]) {
116  return AVERROR(ENOMEM);
117  }
118  }
119 
120  return 0;
121 }
122 
124 {
125  AVFilterLink *outlink = ctx->outputs[0];
126  static const enum AVPixelFormat pix_fmts[] = {
129  };
130  int ret;
131 
132  AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
133  if ((ret = ff_formats_ref(fmts_list, &outlink->in_formats)) < 0)
134  return ret;
135 
136  return 0;
137 }
138 
140 {
141  int i, j;
142  int bg = AV_RN32(s->bg);
143 
144  for (i = 0; i < out->height; i++)
145  for (j = 0; j < out->width; j++)
146  AV_WN32(out->data[0] + i * out->linesize[0] + j * 4, bg);
147 }
148 
149 static inline void draw_dot(int fg, int x, int y, AVFrame *out)
150 {
151  AV_WN32(out->data[0] + y * out->linesize[0] + x * 4, fg);
152 }
153 
155 {
156  AVFilterContext *ctx = inlink->dst;
157  DrawGraphContext *s = ctx->priv;
158  AVFilterLink *outlink = ctx->outputs[0];
159  AVDictionary *metadata;
161  AVFrame *out = s->out;
162  int i;
163 
164  if (s->slide == 4 && s->nb_values >= s->values_size[0] / sizeof(float)) {
165  float *ptr;
166 
167  ptr = av_fast_realloc(s->values[0], &s->values_size[0], s->values_size[0] * 2);
168  if (!ptr)
169  return AVERROR(ENOMEM);
170  s->values[0] = ptr;
171 
172  ptr = av_fast_realloc(s->values[1], &s->values_size[1], s->values_size[1] * 2);
173  if (!ptr)
174  return AVERROR(ENOMEM);
175  s->values[1] = ptr;
176 
177  ptr = av_fast_realloc(s->values[2], &s->values_size[2], s->values_size[2] * 2);
178  if (!ptr)
179  return AVERROR(ENOMEM);
180  s->values[2] = ptr;
181 
182  ptr = av_fast_realloc(s->values[3], &s->values_size[3], s->values_size[3] * 2);
183  if (!ptr)
184  return AVERROR(ENOMEM);
185  s->values[3] = ptr;
186  }
187 
188  if (s->slide != 4 || s->nb_values == 0) {
189  if (!s->out || s->out->width != outlink->w ||
190  s->out->height != outlink->h) {
191  av_frame_free(&s->out);
192  s->out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
193  out = s->out;
194  if (!s->out) {
195  av_frame_free(&in);
196  return AVERROR(ENOMEM);
197  }
198 
199  clear_image(s, out, outlink);
200  }
201  av_frame_copy_props(out, in);
202  }
203 
204  metadata = in->metadata;
205 
206  for (i = 0; i < 4; i++) {
207  double values[VAR_VARS_NB];
208  int j, y, x, old;
209  uint32_t fg, bg;
210  float vf;
211 
212  if (s->slide == 4)
213  s->values[i][s->nb_values] = NAN;
214 
215  e = av_dict_get(metadata, s->key[i], NULL, 0);
216  if (!e || !e->value)
217  continue;
218 
219  if (av_sscanf(e->value, "%f", &vf) != 1)
220  continue;
221 
222  vf = av_clipf(vf, s->min, s->max);
223 
224  if (s->slide == 4) {
225  s->values[i][s->nb_values] = vf;
226  continue;
227  }
228 
229  values[VAR_MIN] = s->min;
230  values[VAR_MAX] = s->max;
231  values[VAR_VAL] = vf;
232 
233  fg = av_expr_eval(s->fg_expr[i], values, NULL);
234  bg = AV_RN32(s->bg);
235 
236  if (i == 0 && (s->x >= outlink->w || s->slide == 3)) {
237  if (s->slide == 0 || s->slide == 1)
238  s->x = 0;
239 
240  if (s->slide == 2) {
241  s->x = outlink->w - 1;
242  for (j = 0; j < outlink->h; j++) {
243  memmove(out->data[0] + j * out->linesize[0] ,
244  out->data[0] + j * out->linesize[0] + 4,
245  (outlink->w - 1) * 4);
246  }
247  } else if (s->slide == 3) {
248  s->x = 0;
249  for (j = 0; j < outlink->h; j++) {
250  memmove(out->data[0] + j * out->linesize[0] + 4,
251  out->data[0] + j * out->linesize[0],
252  (outlink->w - 1) * 4);
253  }
254  } else if (s->slide == 0) {
255  clear_image(s, out, outlink);
256  }
257  }
258 
259  x = s->x;
260  y = (outlink->h - 1) * (1 - ((vf - s->min) / (s->max - s->min)));
261 
262  switch (s->mode) {
263  case 0:
264  if (i == 0 && (s->slide > 0))
265  for (j = 0; j < outlink->h; j++)
266  draw_dot(bg, x, j, out);
267 
268  old = AV_RN32(out->data[0] + y * out->linesize[0] + x * 4);
269  for (j = y; j < outlink->h; j++) {
270  if (old != bg &&
271  (AV_RN32(out->data[0] + j * out->linesize[0] + x * 4) != old) ||
272  AV_RN32(out->data[0] + FFMIN(j+1, outlink->h - 1) * out->linesize[0] + x * 4) != old) {
273  draw_dot(fg, x, j, out);
274  break;
275  }
276  draw_dot(fg, x, j, out);
277  }
278  break;
279  case 1:
280  if (i == 0 && (s->slide > 0))
281  for (j = 0; j < outlink->h; j++)
282  draw_dot(bg, x, j, out);
283  draw_dot(fg, x, y, out);
284  break;
285  case 2:
286  if (s->first[i]) {
287  s->first[i] = 0;
288  s->prev_y[i] = y;
289  }
290 
291  if (i == 0 && (s->slide > 0)) {
292  for (j = 0; j < y; j++)
293  draw_dot(bg, x, j, out);
294  for (j = outlink->h - 1; j > y; j--)
295  draw_dot(bg, x, j, out);
296  }
297  if (y <= s->prev_y[i]) {
298  for (j = y; j <= s->prev_y[i]; j++)
299  draw_dot(fg, x, j, out);
300  } else {
301  for (j = s->prev_y[i]; j <= y; j++)
302  draw_dot(fg, x, j, out);
303  }
304  s->prev_y[i] = y;
305  break;
306  }
307  }
308 
309  s->nb_values++;
310  s->x++;
311 
312  av_frame_free(&in);
313 
314  if (s->slide == 4)
315  return 0;
316 
317  return ff_filter_frame(outlink, av_frame_clone(s->out));
318 }
319 
320 static int request_frame(AVFilterLink *outlink)
321 {
322  AVFilterContext *ctx = outlink->src;
323  DrawGraphContext *s = ctx->priv;
324  AVFrame *out = s->out;
325  int ret, i, k, step, l;
326 
327  ret = ff_request_frame(ctx->inputs[0]);
328 
329  if (s->slide == 4 && ret == AVERROR_EOF && s->nb_values > 0) {
330  s->x = l = 0;
331  step = ceil(s->nb_values / (float)s->w);
332 
333  for (k = 0; k < s->nb_values; k++) {
334  for (i = 0; i < 4; i++) {
335  double values[VAR_VARS_NB];
336  int j, y, x, old;
337  uint32_t fg, bg;
338  float vf = s->values[i][k];
339 
340  if (isnan(vf))
341  continue;
342 
343  values[VAR_MIN] = s->min;
344  values[VAR_MAX] = s->max;
345  values[VAR_VAL] = vf;
346 
347  fg = av_expr_eval(s->fg_expr[i], values, NULL);
348  bg = AV_RN32(s->bg);
349 
350  x = s->x;
351  y = (outlink->h - 1) * (1 - ((vf - s->min) / (s->max - s->min)));
352 
353  switch (s->mode) {
354  case 0:
355  old = AV_RN32(out->data[0] + y * out->linesize[0] + x * 4);
356  for (j = y; j < outlink->h; j++) {
357  if (old != bg &&
358  (AV_RN32(out->data[0] + j * out->linesize[0] + x * 4) != old) ||
359  AV_RN32(out->data[0] + FFMIN(j+1, outlink->h - 1) * out->linesize[0] + x * 4) != old) {
360  draw_dot(fg, x, j, out);
361  break;
362  }
363  draw_dot(fg, x, j, out);
364  }
365  break;
366  case 1:
367  draw_dot(fg, x, y, out);
368  break;
369  case 2:
370  if (s->first[i]) {
371  s->first[i] = 0;
372  s->prev_y[i] = y;
373  }
374 
375  if (y <= s->prev_y[i]) {
376  for (j = y; j <= s->prev_y[i]; j++)
377  draw_dot(fg, x, j, out);
378  } else {
379  for (j = s->prev_y[i]; j <= y; j++)
380  draw_dot(fg, x, j, out);
381  }
382  s->prev_y[i] = y;
383  break;
384  }
385  }
386 
387  l++;
388  if (l >= step) {
389  l = 0;
390  s->x++;
391  }
392  }
393 
394  s->nb_values = 0;
395  out->pts = 0;
396  ret = ff_filter_frame(ctx->outputs[0], s->out);
397  }
398 
399  return ret;
400 }
401 
402 static int config_output(AVFilterLink *outlink)
403 {
404  DrawGraphContext *s = outlink->src->priv;
405 
406  outlink->w = s->w;
407  outlink->h = s->h;
408  outlink->sample_aspect_ratio = (AVRational){1,1};
409 
410  return 0;
411 }
412 
414 {
415  DrawGraphContext *s = ctx->priv;
416  int i;
417 
418  for (i = 0; i < 4; i++)
419  av_expr_free(s->fg_expr[i]);
420 
421  if (s->slide != 4)
422  av_frame_free(&s->out);
423 
424  av_freep(&s->values[0]);
425  av_freep(&s->values[1]);
426  av_freep(&s->values[2]);
427  av_freep(&s->values[3]);
428 }
429 
430 #if CONFIG_DRAWGRAPH_FILTER
431 
432 AVFILTER_DEFINE_CLASS(drawgraph);
433 
434 static const AVFilterPad drawgraph_inputs[] = {
435  {
436  .name = "default",
437  .type = AVMEDIA_TYPE_VIDEO,
438  .filter_frame = filter_frame,
439  },
440  { NULL }
441 };
442 
443 static const AVFilterPad drawgraph_outputs[] = {
444  {
445  .name = "default",
446  .type = AVMEDIA_TYPE_VIDEO,
447  .config_props = config_output,
448  .request_frame = request_frame,
449  },
450  { NULL }
451 };
452 
454  .name = "drawgraph",
455  .description = NULL_IF_CONFIG_SMALL("Draw a graph using input video metadata."),
456  .priv_size = sizeof(DrawGraphContext),
457  .priv_class = &drawgraph_class,
459  .init = init,
460  .uninit = uninit,
461  .inputs = drawgraph_inputs,
462  .outputs = drawgraph_outputs,
463 };
464 
465 #endif // CONFIG_DRAWGRAPH_FILTER
466 
467 #if CONFIG_ADRAWGRAPH_FILTER
468 
469 #define adrawgraph_options drawgraph_options
470 AVFILTER_DEFINE_CLASS(adrawgraph);
471 
472 static const AVFilterPad adrawgraph_inputs[] = {
473  {
474  .name = "default",
475  .type = AVMEDIA_TYPE_AUDIO,
476  .filter_frame = filter_frame,
477  },
478  { NULL }
479 };
480 
481 static const AVFilterPad adrawgraph_outputs[] = {
482  {
483  .name = "default",
484  .type = AVMEDIA_TYPE_VIDEO,
485  .config_props = config_output,
486  .request_frame = request_frame,
487  },
488  { NULL }
489 };
490 
492  .name = "adrawgraph",
493  .description = NULL_IF_CONFIG_SMALL("Draw a graph using input audio metadata."),
494  .priv_size = sizeof(DrawGraphContext),
495  .priv_class = &adrawgraph_class,
497  .init = init,
498  .uninit = uninit,
499  .inputs = adrawgraph_inputs,
500  .outputs = adrawgraph_outputs,
501 };
502 #endif // CONFIG_ADRAWGRAPH_FILTER
#define NULL
Definition: coverity.c:32
static av_cold int init(AVFilterContext *ctx)
Definition: f_drawgraph.c:86
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
static void draw_dot(int fg, int x, int y, AVFrame *out)
Definition: f_drawgraph.c:149
AVOption.
Definition: opt.h:246
AVFrame * out
Definition: f_drawgraph.c:44
Main libavfilter public API header.
static const char *const var_names[]
Definition: f_drawgraph.c:83
AVFilter ff_vf_drawgraph
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:683
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:99
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: f_drawgraph.c:154
int values_size[4]
Definition: f_drawgraph.c:49
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:283
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:1093
static const AVOption drawgraph_options[]
Definition: f_drawgraph.c:56
uint8_t
#define av_cold
Definition: attributes.h:82
AVOptions.
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:388
Definition: eval.c:157
static void clear_image(DrawGraphContext *s, AVFrame *out, AVFilterLink *outlink)
Definition: f_drawgraph.c:139
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
char * key[4]
Definition: f_drawgraph.c:35
#define AVERROR_EOF
End of file.
Definition: error.h:55
AVDictionary * metadata
metadata.
Definition: frame.h:581
static av_cold void uninit(AVFilterContext *ctx)
Definition: f_drawgraph.c:413
#define av_log(a,...)
A filter pad used for either input or output.
Definition: internal.h:54
static int request_frame(AVFilterLink *outlink)
Definition: f_drawgraph.c:320
static int config_output(AVFilterLink *outlink)
Definition: f_drawgraph.c:402
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
int width
Definition: frame.h:353
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
float * values[4]
Definition: f_drawgraph.c:48
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
void * priv
private data for use by the filter
Definition: avfilter.h:353
uint8_t bg[4]
Definition: f_drawgraph.c:39
int av_sscanf(const char *string, const char *format,...)
See libc sscanf manual for more information.
Definition: avsscanf.c:962
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
#define NAN
Definition: mathematics.h:64
#define FFMIN(a, b)
Definition: common.h:96
int ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
Add *ref as a new reference to formats.
Definition: formats.c:439
AVFormatContext * ctx
Definition: movenc.c:48
#define FLAGS
Definition: f_drawgraph.c:54
#define s(width, name)
Definition: cbs_vp9.c:257
void * av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
Reallocate the given buffer if it is not large enough, otherwise do nothing.
Definition: mem.c:476
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:540
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
AVFilter ff_avf_adrawgraph
#define OFFSET(x)
Definition: f_drawgraph.c:53
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:336
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
AVExpr * fg_expr[4]
Definition: f_drawgraph.c:38
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 inputs
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31))))#define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac){}void ff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map){AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);return NULL;}return ac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;}int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){int use_generic=1;int len=in->nb_samples;int p;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
Rational number (pair of numerator and denominator).
Definition: rational.h:58
#define isnan(x)
Definition: libm.h:340
const char * name
Filter name.
Definition: avfilter.h:148
offset must point to two consecutive integers
Definition: opt.h:233
#define AV_RN32(p)
Definition: intreadwrite.h:364
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
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
#define AV_WN32(p, v)
Definition: intreadwrite.h:376
static int query_formats(AVFilterContext *ctx)
Definition: f_drawgraph.c:123
char * value
Definition: dict.h:87
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
Evaluate a previously parsed expression.
Definition: eval.c:754
#define AVFILTER_DEFINE_CLASS(fname)
Definition: internal.h:334
A list of supported formats for one end of a filter link.
Definition: formats.h:64
An instance of a filter.
Definition: avfilter.h:338
int height
Definition: frame.h:353
char * fg_str[4]
Definition: f_drawgraph.c:37
#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
internal API functions
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
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
mode
Use these values in ebur128_init (or&#39;ed).
Definition: ebur128.h:83
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:654
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about which is also called distortion Distortion can be quantified by almost any quality measurement one chooses the sum of squared differences is used but more complex methods that consider psychovisual effects can be used as well It makes no difference in this discussion First step
simple arithmetic expression evaluator