FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
vf_scale.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2007 Bobby Bingham
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  * scale video filter
24  */
25 
26 #include <stdio.h>
27 #include <string.h>
28 
29 #include "avfilter.h"
30 #include "formats.h"
31 #include "internal.h"
32 #include "scale.h"
33 #include "video.h"
34 #include "libavutil/avstring.h"
35 #include "libavutil/internal.h"
36 #include "libavutil/mathematics.h"
37 #include "libavutil/opt.h"
38 #include "libavutil/parseutils.h"
39 #include "libavutil/pixdesc.h"
40 #include "libavutil/imgutils.h"
41 #include "libavutil/avassert.h"
42 #include "libswscale/swscale.h"
43 
44 enum EvalMode {
48 };
49 
50 typedef struct ScaleContext {
51  const AVClass *class;
52  struct SwsContext *sws; ///< software scaler context
53  struct SwsContext *isws[2]; ///< software scaler context for interlaced material
55 
56  /**
57  * New dimensions. Special values are:
58  * 0 = original width/height
59  * -1 = keep original aspect
60  * -N = try to keep aspect but make sure it is divisible by N
61  */
62  int w, h;
63  char *size_str;
64  unsigned int flags; ///sws flags
65  double param[2]; // sws params
66 
67  int hsub, vsub; ///< chroma subsampling
68  int slice_y; ///< top of current output slice
69  int input_is_pal; ///< set to 1 if the input format is paletted
70  int output_is_pal; ///< set to 1 if the output format is paletted
72 
73  char *w_expr; ///< width expression string
74  char *h_expr; ///< height expression string
75  char *flags_str;
76 
79 
80  int in_range;
81  int out_range;
82 
87 
89 
90  int nb_slices;
91 
92  int eval_mode; ///< expression evaluation mode
93 
94 } ScaleContext;
95 
97 
99 {
100  ScaleContext *scale = ctx->priv;
101  int ret;
102 
103  if (scale->size_str && (scale->w_expr || scale->h_expr)) {
104  av_log(ctx, AV_LOG_ERROR,
105  "Size and width/height expressions cannot be set at the same time.\n");
106  return AVERROR(EINVAL);
107  }
108 
109  if (scale->w_expr && !scale->h_expr)
110  FFSWAP(char *, scale->w_expr, scale->size_str);
111 
112  if (scale->size_str) {
113  char buf[32];
114  if ((ret = av_parse_video_size(&scale->w, &scale->h, scale->size_str)) < 0) {
115  av_log(ctx, AV_LOG_ERROR,
116  "Invalid size '%s'\n", scale->size_str);
117  return ret;
118  }
119  snprintf(buf, sizeof(buf)-1, "%d", scale->w);
120  av_opt_set(scale, "w", buf, 0);
121  snprintf(buf, sizeof(buf)-1, "%d", scale->h);
122  av_opt_set(scale, "h", buf, 0);
123  }
124  if (!scale->w_expr)
125  av_opt_set(scale, "w", "iw", 0);
126  if (!scale->h_expr)
127  av_opt_set(scale, "h", "ih", 0);
128 
129  av_log(ctx, AV_LOG_VERBOSE, "w:%s h:%s flags:'%s' interl:%d\n",
130  scale->w_expr, scale->h_expr, (char *)av_x_if_null(scale->flags_str, ""), scale->interlaced);
131 
132  scale->flags = 0;
133 
134  if (scale->flags_str) {
135  const AVClass *class = sws_get_class();
136  const AVOption *o = av_opt_find(&class, "sws_flags", NULL, 0,
138  int ret = av_opt_eval_flags(&class, o, scale->flags_str, &scale->flags);
139  if (ret < 0)
140  return ret;
141  }
142  scale->opts = *opts;
143  *opts = NULL;
144 
145  return 0;
146 }
147 
149 {
150  ScaleContext *scale = ctx->priv;
151  sws_freeContext(scale->sws);
152  sws_freeContext(scale->isws[0]);
153  sws_freeContext(scale->isws[1]);
154  scale->sws = NULL;
155  av_dict_free(&scale->opts);
156 }
157 
159 {
161  enum AVPixelFormat pix_fmt;
162  int ret;
163 
164  if (ctx->inputs[0]) {
165  const AVPixFmtDescriptor *desc = NULL;
166  formats = NULL;
167  while ((desc = av_pix_fmt_desc_next(desc))) {
168  pix_fmt = av_pix_fmt_desc_get_id(desc);
169  if ((sws_isSupportedInput(pix_fmt) ||
171  && (ret = ff_add_format(&formats, pix_fmt)) < 0) {
172  return ret;
173  }
174  }
175  if ((ret = ff_formats_ref(formats, &ctx->inputs[0]->out_formats)) < 0)
176  return ret;
177  }
178  if (ctx->outputs[0]) {
179  const AVPixFmtDescriptor *desc = NULL;
180  formats = NULL;
181  while ((desc = av_pix_fmt_desc_next(desc))) {
182  pix_fmt = av_pix_fmt_desc_get_id(desc);
183  if ((sws_isSupportedOutput(pix_fmt) || pix_fmt == AV_PIX_FMT_PAL8 ||
185  && (ret = ff_add_format(&formats, pix_fmt)) < 0) {
186  return ret;
187  }
188  }
189  if ((ret = ff_formats_ref(formats, &ctx->outputs[0]->in_formats)) < 0)
190  return ret;
191  }
192 
193  return 0;
194 }
195 
196 static const int *parse_yuv_type(const char *s, enum AVColorSpace colorspace)
197 {
198  if (!s)
199  s = "bt601";
200 
201  if (s && strstr(s, "bt709")) {
202  colorspace = AVCOL_SPC_BT709;
203  } else if (s && strstr(s, "fcc")) {
204  colorspace = AVCOL_SPC_FCC;
205  } else if (s && strstr(s, "smpte240m")) {
206  colorspace = AVCOL_SPC_SMPTE240M;
207  } else if (s && (strstr(s, "bt601") || strstr(s, "bt470") || strstr(s, "smpte170m"))) {
208  colorspace = AVCOL_SPC_BT470BG;
209  } else if (s && strstr(s, "bt2020")) {
210  colorspace = AVCOL_SPC_BT2020_NCL;
211  }
212 
213  if (colorspace < 1 || colorspace > 10 || colorspace == 8) {
214  colorspace = AVCOL_SPC_BT470BG;
215  }
216 
217  return sws_getCoefficients(colorspace);
218 }
219 
220 static int config_props(AVFilterLink *outlink)
221 {
222  AVFilterContext *ctx = outlink->src;
223  AVFilterLink *inlink0 = outlink->src->inputs[0];
224  AVFilterLink *inlink = ctx->filter == &ff_vf_scale2ref ?
225  outlink->src->inputs[1] :
226  outlink->src->inputs[0];
227  enum AVPixelFormat outfmt = outlink->format;
229  ScaleContext *scale = ctx->priv;
230  int w, h;
231  int ret;
232 
233  if ((ret = ff_scale_eval_dimensions(ctx,
234  scale->w_expr, scale->h_expr,
235  inlink, outlink,
236  &w, &h)) < 0)
237  goto fail;
238 
239  /* Note that force_original_aspect_ratio may overwrite the previous set
240  * dimensions so that it is not divisible by the set factors anymore. */
241  if (scale->force_original_aspect_ratio) {
242  int tmp_w = av_rescale(h, inlink->w, inlink->h);
243  int tmp_h = av_rescale(w, inlink->h, inlink->w);
244 
245  if (scale->force_original_aspect_ratio == 1) {
246  w = FFMIN(tmp_w, w);
247  h = FFMIN(tmp_h, h);
248  } else {
249  w = FFMAX(tmp_w, w);
250  h = FFMAX(tmp_h, h);
251  }
252  }
253 
254  if (w > INT_MAX || h > INT_MAX ||
255  (h * inlink->w) > INT_MAX ||
256  (w * inlink->h) > INT_MAX)
257  av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");
258 
259  outlink->w = w;
260  outlink->h = h;
261 
262  /* TODO: make algorithm configurable */
263 
264  scale->input_is_pal = desc->flags & AV_PIX_FMT_FLAG_PAL ||
266  if (outfmt == AV_PIX_FMT_PAL8) outfmt = AV_PIX_FMT_BGR8;
269 
270  if (scale->sws)
271  sws_freeContext(scale->sws);
272  if (scale->isws[0])
273  sws_freeContext(scale->isws[0]);
274  if (scale->isws[1])
275  sws_freeContext(scale->isws[1]);
276  scale->isws[0] = scale->isws[1] = scale->sws = NULL;
277  if (inlink0->w == outlink->w &&
278  inlink0->h == outlink->h &&
279  !scale->out_color_matrix &&
280  scale->in_range == scale->out_range &&
281  inlink0->format == outlink->format)
282  ;
283  else {
284  struct SwsContext **swscs[3] = {&scale->sws, &scale->isws[0], &scale->isws[1]};
285  int i;
286 
287  for (i = 0; i < 3; i++) {
288  int in_v_chr_pos = scale->in_v_chr_pos, out_v_chr_pos = scale->out_v_chr_pos;
289  struct SwsContext **s = swscs[i];
290  *s = sws_alloc_context();
291  if (!*s)
292  return AVERROR(ENOMEM);
293 
294  av_opt_set_int(*s, "srcw", inlink0 ->w, 0);
295  av_opt_set_int(*s, "srch", inlink0 ->h >> !!i, 0);
296  av_opt_set_int(*s, "src_format", inlink0->format, 0);
297  av_opt_set_int(*s, "dstw", outlink->w, 0);
298  av_opt_set_int(*s, "dsth", outlink->h >> !!i, 0);
299  av_opt_set_int(*s, "dst_format", outfmt, 0);
300  av_opt_set_int(*s, "sws_flags", scale->flags, 0);
301  av_opt_set_int(*s, "param0", scale->param[0], 0);
302  av_opt_set_int(*s, "param1", scale->param[1], 0);
303  if (scale->in_range != AVCOL_RANGE_UNSPECIFIED)
304  av_opt_set_int(*s, "src_range",
305  scale->in_range == AVCOL_RANGE_JPEG, 0);
306  if (scale->out_range != AVCOL_RANGE_UNSPECIFIED)
307  av_opt_set_int(*s, "dst_range",
308  scale->out_range == AVCOL_RANGE_JPEG, 0);
309 
310  if (scale->opts) {
311  AVDictionaryEntry *e = NULL;
312  while ((e = av_dict_get(scale->opts, "", e, AV_DICT_IGNORE_SUFFIX))) {
313  if ((ret = av_opt_set(*s, e->key, e->value, 0)) < 0)
314  return ret;
315  }
316  }
317  /* Override YUV420P default settings to have the correct (MPEG-2) chroma positions
318  * MPEG-2 chroma positions are used by convention
319  * XXX: support other 4:2:0 pixel formats */
320  if (inlink0->format == AV_PIX_FMT_YUV420P && scale->in_v_chr_pos == -513) {
321  in_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
322  }
323 
324  if (outlink->format == AV_PIX_FMT_YUV420P && scale->out_v_chr_pos == -513) {
325  out_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
326  }
327 
328  av_opt_set_int(*s, "src_h_chr_pos", scale->in_h_chr_pos, 0);
329  av_opt_set_int(*s, "src_v_chr_pos", in_v_chr_pos, 0);
330  av_opt_set_int(*s, "dst_h_chr_pos", scale->out_h_chr_pos, 0);
331  av_opt_set_int(*s, "dst_v_chr_pos", out_v_chr_pos, 0);
332 
333  if ((ret = sws_init_context(*s, NULL, NULL)) < 0)
334  return ret;
335  if (!scale->interlaced)
336  break;
337  }
338  }
339 
340  if (inlink0->sample_aspect_ratio.num){
341  outlink->sample_aspect_ratio = av_mul_q((AVRational){outlink->h * inlink0->w, outlink->w * inlink0->h}, inlink0->sample_aspect_ratio);
342  } else
343  outlink->sample_aspect_ratio = inlink0->sample_aspect_ratio;
344 
345  av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s sar:%d/%d -> w:%d h:%d fmt:%s sar:%d/%d flags:0x%0x\n",
346  inlink ->w, inlink ->h, av_get_pix_fmt_name( inlink->format),
348  outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),
349  outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den,
350  scale->flags);
351  return 0;
352 
353 fail:
354  return ret;
355 }
356 
357 static int config_props_ref(AVFilterLink *outlink)
358 {
359  AVFilterLink *inlink = outlink->src->inputs[1];
360 
361  outlink->w = inlink->w;
362  outlink->h = inlink->h;
363  outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
364  outlink->time_base = inlink->time_base;
365  outlink->frame_rate = inlink->frame_rate;
366 
367  return 0;
368 }
369 
370 static int request_frame(AVFilterLink *outlink)
371 {
372  return ff_request_frame(outlink->src->inputs[0]);
373 }
374 
375 static int request_frame_ref(AVFilterLink *outlink)
376 {
377  return ff_request_frame(outlink->src->inputs[1]);
378 }
379 
380 static int scale_slice(AVFilterLink *link, AVFrame *out_buf, AVFrame *cur_pic, struct SwsContext *sws, int y, int h, int mul, int field)
381 {
382  ScaleContext *scale = link->dst->priv;
383  const uint8_t *in[4];
384  uint8_t *out[4];
385  int in_stride[4],out_stride[4];
386  int i;
387 
388  for(i=0; i<4; i++){
389  int vsub= ((i+1)&2) ? scale->vsub : 0;
390  in_stride[i] = cur_pic->linesize[i] * mul;
391  out_stride[i] = out_buf->linesize[i] * mul;
392  in[i] = cur_pic->data[i] + ((y>>vsub)+field) * cur_pic->linesize[i];
393  out[i] = out_buf->data[i] + field * out_buf->linesize[i];
394  }
395  if(scale->input_is_pal)
396  in[1] = cur_pic->data[1];
397  if(scale->output_is_pal)
398  out[1] = out_buf->data[1];
399 
400  return sws_scale(sws, in, in_stride, y/mul, h,
401  out,out_stride);
402 }
403 
404 static int filter_frame(AVFilterLink *link, AVFrame *in)
405 {
406  ScaleContext *scale = link->dst->priv;
407  AVFilterLink *outlink = link->dst->outputs[0];
408  AVFrame *out;
410  char buf[32];
411  int in_range;
412 
413  if (in->colorspace == AVCOL_SPC_YCGCO)
414  av_log(link->dst, AV_LOG_WARNING, "Detected unsupported YCgCo colorspace.\n");
415 
416  if( in->width != link->w
417  || in->height != link->h
418  || in->format != link->format
420  int ret;
421 
422  if (scale->eval_mode == EVAL_MODE_INIT) {
423  snprintf(buf, sizeof(buf)-1, "%d", outlink->w);
424  av_opt_set(scale, "w", buf, 0);
425  snprintf(buf, sizeof(buf)-1, "%d", outlink->h);
426  av_opt_set(scale, "h", buf, 0);
427  }
428 
429  link->dst->inputs[0]->format = in->format;
430  link->dst->inputs[0]->w = in->width;
431  link->dst->inputs[0]->h = in->height;
432 
435 
436 
437  if ((ret = config_props(outlink)) < 0)
438  return ret;
439  }
440 
441  if (!scale->sws)
442  return ff_filter_frame(outlink, in);
443 
444  scale->hsub = desc->log2_chroma_w;
445  scale->vsub = desc->log2_chroma_h;
446 
447  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
448  if (!out) {
449  av_frame_free(&in);
450  return AVERROR(ENOMEM);
451  }
452 
453  av_frame_copy_props(out, in);
454  out->width = outlink->w;
455  out->height = outlink->h;
456 
457  if(scale->output_is_pal)
458  avpriv_set_systematic_pal2((uint32_t*)out->data[1], outlink->format == AV_PIX_FMT_PAL8 ? AV_PIX_FMT_BGR8 : outlink->format);
459 
460  in_range = in->color_range;
461 
462  if ( scale->in_color_matrix
463  || scale->out_color_matrix
464  || scale-> in_range != AVCOL_RANGE_UNSPECIFIED
465  || in_range != AVCOL_RANGE_UNSPECIFIED
466  || scale->out_range != AVCOL_RANGE_UNSPECIFIED) {
467  int in_full, out_full, brightness, contrast, saturation;
468  const int *inv_table, *table;
469 
470  sws_getColorspaceDetails(scale->sws, (int **)&inv_table, &in_full,
471  (int **)&table, &out_full,
472  &brightness, &contrast, &saturation);
473 
474  if (scale->in_color_matrix)
475  inv_table = parse_yuv_type(scale->in_color_matrix, in->colorspace);
476  if (scale->out_color_matrix)
478  else if (scale->in_color_matrix)
479  table = inv_table;
480 
481  if (scale-> in_range != AVCOL_RANGE_UNSPECIFIED)
482  in_full = (scale-> in_range == AVCOL_RANGE_JPEG);
483  else if (in_range != AVCOL_RANGE_UNSPECIFIED)
484  in_full = (in_range == AVCOL_RANGE_JPEG);
485  if (scale->out_range != AVCOL_RANGE_UNSPECIFIED)
486  out_full = (scale->out_range == AVCOL_RANGE_JPEG);
487 
488  sws_setColorspaceDetails(scale->sws, inv_table, in_full,
489  table, out_full,
490  brightness, contrast, saturation);
491  if (scale->isws[0])
492  sws_setColorspaceDetails(scale->isws[0], inv_table, in_full,
493  table, out_full,
494  brightness, contrast, saturation);
495  if (scale->isws[1])
496  sws_setColorspaceDetails(scale->isws[1], inv_table, in_full,
497  table, out_full,
498  brightness, contrast, saturation);
499 
500  out->color_range = out_full ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
501  }
502 
504  (int64_t)in->sample_aspect_ratio.num * outlink->h * link->w,
505  (int64_t)in->sample_aspect_ratio.den * outlink->w * link->h,
506  INT_MAX);
507 
508  if(scale->interlaced>0 || (scale->interlaced<0 && in->interlaced_frame)){
509  scale_slice(link, out, in, scale->isws[0], 0, (link->h+1)/2, 2, 0);
510  scale_slice(link, out, in, scale->isws[1], 0, link->h /2, 2, 1);
511  }else if (scale->nb_slices) {
512  int i, slice_h, slice_start, slice_end = 0;
513  const int nb_slices = FFMIN(scale->nb_slices, link->h);
514  for (i = 0; i < nb_slices; i++) {
515  slice_start = slice_end;
516  slice_end = (link->h * (i+1)) / nb_slices;
517  slice_h = slice_end - slice_start;
518  scale_slice(link, out, in, scale->sws, slice_start, slice_h, 1, 0);
519  }
520  }else{
521  scale_slice(link, out, in, scale->sws, 0, link->h, 1, 0);
522  }
523 
524  av_frame_free(&in);
525  return ff_filter_frame(outlink, out);
526 }
527 
529 {
530  AVFilterLink *outlink = link->dst->outputs[1];
531 
532  return ff_filter_frame(outlink, in);
533 }
534 
535 static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
536  char *res, int res_len, int flags)
537 {
538  ScaleContext *scale = ctx->priv;
539  int ret;
540 
541  if ( !strcmp(cmd, "width") || !strcmp(cmd, "w")
542  || !strcmp(cmd, "height") || !strcmp(cmd, "h")) {
543 
544  int old_w = scale->w;
545  int old_h = scale->h;
546  AVFilterLink *outlink = ctx->outputs[0];
547 
548  av_opt_set(scale, cmd, args, 0);
549  if ((ret = config_props(outlink)) < 0) {
550  scale->w = old_w;
551  scale->h = old_h;
552  }
553  } else
554  ret = AVERROR(ENOSYS);
555 
556  return ret;
557 }
558 
559 static const AVClass *child_class_next(const AVClass *prev)
560 {
561  return prev ? NULL : sws_get_class();
562 }
563 
564 #define OFFSET(x) offsetof(ScaleContext, x)
565 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
566 
567 static const AVOption scale_options[] = {
568  { "w", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
569  { "width", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
570  { "h", "Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
571  { "height","Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = FLAGS },
572  { "flags", "Flags to pass to libswscale", OFFSET(flags_str), AV_OPT_TYPE_STRING, { .str = "bilinear" }, .flags = FLAGS },
573  { "interl", "set interlacing", OFFSET(interlaced), AV_OPT_TYPE_BOOL, {.i64 = 0 }, -1, 1, FLAGS },
574  { "size", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
575  { "s", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
576  { "in_color_matrix", "set input YCbCr type", OFFSET(in_color_matrix), AV_OPT_TYPE_STRING, { .str = "auto" }, .flags = FLAGS },
577  { "out_color_matrix", "set output YCbCr type", OFFSET(out_color_matrix), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS },
578  { "in_range", "set input color range", OFFSET( in_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },
579  { "out_range", "set output color range", OFFSET(out_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },
580  { "auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 0, FLAGS, "range" },
581  { "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
582  { "jpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
583  { "mpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
584  { "tv", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
585  { "pc", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
586  { "in_v_chr_pos", "input vertical chroma position in luma grid/256" , OFFSET(in_v_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },
587  { "in_h_chr_pos", "input horizontal chroma position in luma grid/256", OFFSET(in_h_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },
588  { "out_v_chr_pos", "output vertical chroma position in luma grid/256" , OFFSET(out_v_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },
589  { "out_h_chr_pos", "output horizontal chroma position in luma grid/256", OFFSET(out_h_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },
590  { "force_original_aspect_ratio", "decrease or increase w/h if necessary to keep the original AR", OFFSET(force_original_aspect_ratio), AV_OPT_TYPE_INT, { .i64 = 0}, 0, 2, FLAGS, "force_oar" },
591  { "disable", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, FLAGS, "force_oar" },
592  { "decrease", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, FLAGS, "force_oar" },
593  { "increase", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 0, FLAGS, "force_oar" },
594  { "param0", "Scaler param 0", OFFSET(param[0]), AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, FLAGS },
595  { "param1", "Scaler param 1", OFFSET(param[1]), AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, FLAGS },
596  { "nb_slices", "set the number of slices (debug purpose only)", OFFSET(nb_slices), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
597  { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
598  { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
599  { "frame", "eval expressions during initialization and per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
600  { NULL }
601 };
602 
603 static const AVClass scale_class = {
604  .class_name = "scale",
605  .item_name = av_default_item_name,
606  .option = scale_options,
607  .version = LIBAVUTIL_VERSION_INT,
608  .category = AV_CLASS_CATEGORY_FILTER,
609  .child_class_next = child_class_next,
610 };
611 
613  {
614  .name = "default",
615  .type = AVMEDIA_TYPE_VIDEO,
616  .filter_frame = filter_frame,
617  },
618  { NULL }
619 };
620 
622  {
623  .name = "default",
624  .type = AVMEDIA_TYPE_VIDEO,
625  .config_props = config_props,
626  },
627  { NULL }
628 };
629 
631  .name = "scale",
632  .description = NULL_IF_CONFIG_SMALL("Scale the input video size and/or convert the image format."),
633  .init_dict = init_dict,
634  .uninit = uninit,
635  .query_formats = query_formats,
636  .priv_size = sizeof(ScaleContext),
637  .priv_class = &scale_class,
638  .inputs = avfilter_vf_scale_inputs,
639  .outputs = avfilter_vf_scale_outputs,
641 };
642 
643 static const AVClass scale2ref_class = {
644  .class_name = "scale2ref",
645  .item_name = av_default_item_name,
646  .option = scale_options,
647  .version = LIBAVUTIL_VERSION_INT,
648  .category = AV_CLASS_CATEGORY_FILTER,
649  .child_class_next = child_class_next,
650 };
651 
653  {
654  .name = "default",
655  .type = AVMEDIA_TYPE_VIDEO,
656  .filter_frame = filter_frame,
657  },
658  {
659  .name = "ref",
660  .type = AVMEDIA_TYPE_VIDEO,
661  .filter_frame = filter_frame_ref,
662  },
663  { NULL }
664 };
665 
667  {
668  .name = "default",
669  .type = AVMEDIA_TYPE_VIDEO,
670  .config_props = config_props,
671  .request_frame= request_frame,
672  },
673  {
674  .name = "ref",
675  .type = AVMEDIA_TYPE_VIDEO,
676  .config_props = config_props_ref,
677  .request_frame= request_frame_ref,
678  },
679  { NULL }
680 };
681 
682 AVFilter ff_vf_scale2ref = {
683  .name = "scale2ref",
684  .description = NULL_IF_CONFIG_SMALL("Scale the input video size and/or convert the image format to the given reference."),
685  .init_dict = init_dict,
686  .uninit = uninit,
687  .query_formats = query_formats,
688  .priv_size = sizeof(ScaleContext),
689  .priv_class = &scale2ref_class,
690  .inputs = avfilter_vf_scale2ref_inputs,
691  .outputs = avfilter_vf_scale2ref_outputs,
693 };
#define AV_PIX_FMT_FLAG_PAL
Pixel format has a palette in data[1], values are indexes in this palette.
Definition: pixdesc.h:132
also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
Definition: pixfmt.h:468
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
static av_cold int init_dict(AVFilterContext *ctx, AVDictionary **opts)
Definition: vf_scale.c:98
static enum AVPixelFormat pix_fmt
int ff_scale_eval_dimensions(void *log_ctx, const char *w_expr, const char *h_expr, AVFilterLink *inlink, AVFilterLink *outlink, int *ret_w, int *ret_h)
Definition: scale.c:106
#define FLAGS
Definition: vf_scale.c:565
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2359
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
int in_h_chr_pos
Definition: vf_scale.c:85
AVOption.
Definition: opt.h:246
int av_parse_video_size(int *width_ptr, int *height_ptr, const char *str)
Parse str and put in width_ptr and height_ptr the detected values.
Definition: parseutils.c:148
misc image utilities
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:86
Main libavfilter public API header.
const char * desc
Definition: nvenc.c:63
int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table, int *srcRange, int **table, int *dstRange, int *brightness, int *contrast, int *saturation)
Definition: utils.c:983
also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601 ...
Definition: pixfmt.h:472
static int scale_slice(AVFilterLink *link, AVFrame *out_buf, AVFrame *cur_pic, struct SwsContext *sws, int y, int h, int mul, int field)
Definition: vf_scale.c:380
int num
Numerator.
Definition: rational.h:59
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:193
int in_v_chr_pos
Definition: vf_scale.c:86
int out_h_chr_pos
Definition: vf_scale.c:83
int eval_mode
expression evaluation mode
Definition: vf_scale.c:92
int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)
Definition: utils.c:273
int force_original_aspect_ratio
Definition: vf_scale.c:88
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:92
const AVClass * sws_get_class(void)
Get the AVClass for swsContext.
Definition: options.c:95
int vsub
chroma subsampling
Definition: vf_scale.c:67
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:92
int output_is_pal
set to 1 if the output format is paletted
Definition: vf_scale.c:70
functionally identical to above
Definition: pixfmt.h:474
const char * name
Pad name.
Definition: internal.h:60
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:346
char * w_expr
width expression string
Definition: vf_scale.c:73
static int query_formats(AVFilterContext *ctx)
Definition: vf_scale.c:158
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1113
uint8_t
#define av_cold
Definition: attributes.h:82
av_warn_unused_result int sws_init_context(struct SwsContext *sws_context, SwsFilter *srcFilter, SwsFilter *dstFilter)
Initialize the swscaler context sws_context.
Definition: utils.c:1153
char * h_expr
height expression string
Definition: vf_scale.c:74
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
AVOptions.
AVColorSpace
YUV colorspace type.
Definition: pixfmt.h:466
int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt)
Definition: imgutils.c:152
Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16.
Definition: pixfmt.h:475
AVFilter ff_vf_scale2ref
Definition: vf_scale.c:96
static const int * parse_yuv_type(const char *s, enum AVColorSpace colorspace)
Definition: vf_scale.c:196
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 int flags
Definition: log.c:57
static const AVClass scale_class
Definition: vf_scale.c:603
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:348
external API header
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Definition: rational.c:35
#define av_log(a,...)
A filter pad used for either input or output.
Definition: internal.h:54
static void * av_x_if_null(const void *p, const void *x)
Return x default pointer in case p is NULL.
Definition: avutil.h:308
int width
Definition: frame.h:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:101
static const AVClass scale2ref_class
Definition: vf_scale.c:643
static const AVOption scale_options[]
Definition: vf_scale.c:567
#define AVERROR(e)
Definition: error.h:43
int av_opt_eval_flags(void *obj, const AVOption *o, const char *val, int *flags_out)
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:163
#define sws_isSupportedOutput(x)
static const struct endianess table[]
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:190
void * priv
private data for use by the filter
Definition: avfilter.h:353
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: frame.h:446
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values. ...
Definition: dict.c:203
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
Definition: opt.c:558
enum AVColorSpace colorspace
YUV colorspace type.
Definition: frame.h:457
simple assert() macros that are a bit more flexible than ISO C assert().
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:337
#define FFMAX(a, b)
Definition: common.h:94
#define fail()
Definition: checkasm.h:109
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
Definition: vf_scale.c:535
int w
New dimensions.
Definition: vf_scale.c:62
static int config_props(AVFilterLink *outlink)
Definition: vf_scale.c:220
const AVOption * av_opt_find(void *obj, const char *name, const char *unit, int opt_flags, int search_flags)
Look for an option in an object.
Definition: opt.c:1594
common internal API header
uint64_t flags
Combination of AV_PIX_FMT_FLAG_...
Definition: pixdesc.h:106
char * out_color_matrix
Definition: vf_scale.c:78
AVDictionary * opts
Definition: movenc.c:50
enum AVPixelFormat av_pix_fmt_desc_get_id(const AVPixFmtDescriptor *desc)
Definition: pixdesc.c:2378
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_scale.c:148
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:129
static const AVFilterPad avfilter_vf_scale_outputs[]
Definition: vf_scale.c:621
#define FFMIN(a, b)
Definition: common.h:96
double param[2]
sws flags
Definition: vf_scale.c:65
uint8_t interlaced
Definition: mxfenc.c:1898
int ff_formats_ref(AVFilterFormats *f, AVFilterFormats **ref)
Add *ref as a new reference to formats.
Definition: formats.c:440
static int request_frame(AVFilterLink *outlink)
Definition: vf_scale.c:370
ITU-R BT2020 non-constant luminance system.
Definition: pixfmt.h:477
static const AVClass * child_class_next(const AVClass *prev)
Definition: vf_scale.c:559
#define AV_PIX_FMT_FLAG_PSEUDOPAL
The pixel format is "pseudo-paletted".
Definition: pixdesc.h:158
AVFormatContext * ctx
Definition: movenc.c:48
void sws_freeContext(struct SwsContext *swsContext)
Free the swscaler context swsContext.
Definition: utils.c:2284
int interlaced
Definition: vf_scale.c:71
const int * sws_getCoefficients(int colorspace)
Return a pointer to yuv<->rgb coefficients for the given colorspace suitable for sws_setColorspaceDet...
Definition: yuv2rgb.c:63
#define sws_isSupportedInput(x)
static const AVFilterPad outputs[]
Definition: af_afftfilt.c:389
int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4], int srcRange, const int table[4], int dstRange, int brightness, int contrast, int saturation)
Definition: utils.c:848
char * flags_str
Definition: vf_scale.c:75
FCC Title 47 Code of Federal Regulations 73.682 (a)(20)
Definition: pixfmt.h:471
EvalMode
Definition: af_volume.h:39
the normal 2^n-1 "JPEG" YUV ranges
Definition: pixfmt.h:492
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:274
static int config_props_ref(AVFilterLink *outlink)
Definition: vf_scale.c:357
static int filter_frame_ref(AVFilterLink *link, AVFrame *in)
Definition: vf_scale.c:528
packed RGB 3:3:2, 8bpp, (msb)2B 3G 3R(lsb)
Definition: pixfmt.h:79
static const AVFilterPad inputs[]
Definition: af_afftfilt.c:379
#define OFFSET(x)
Definition: vf_scale.c:564
AVFilter ff_vf_scale
Definition: vf_scale.c:630
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:232
struct SwsContext * sws
software scaler context
Definition: vf_scale.c:52
static int request_frame_ref(AVFilterLink *outlink)
Definition: vf_scale.c:375
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
static const AVFilterPad avfilter_vf_scale_inputs[]
Definition: vf_scale.c:612
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
Definition: frame.h:289
static const AVFilterPad avfilter_vf_scale2ref_outputs[]
Definition: vf_scale.c:666
AVDictionary * opts
Definition: vf_scale.c:54
int attribute_align_arg sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[])
swscale wrapper, so we don't need to export the SwsContext.
Definition: swscale.c:753
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;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);returnNULL;}returnac;}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;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->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);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
void * buf
Definition: avisynth_c.h:690
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
const char * name
Filter name.
Definition: avfilter.h:148
#define snprintf
Definition: snprintf.h:34
int input_is_pal
set to 1 if the input format is paletted
Definition: vf_scale.c:69
unsigned int flags
Definition: vf_scale.c:64
misc parsing utilities
struct SwsContext * sws_alloc_context(void)
Allocate an empty SwsContext.
Definition: utils.c:1067
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
int out_v_chr_pos
Definition: vf_scale.c:84
struct SwsContext * isws[2]
software scaler context for interlaced material
Definition: vf_scale.c:53
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
static int filter_frame(AVFilterLink *link, AVFrame *in)
Definition: vf_scale.c:404
int in_range
Definition: vf_scale.c:80
the normal 219*2^(n-8) "MPEG" YUV ranges
Definition: pixfmt.h:491
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
double param[2]
Input parameters for scaling algorithms that need them.
int out_range
Definition: vf_scale.c:81
#define AV_OPT_SEARCH_FAKE_OBJ
The obj passed to av_opt_find() is fake – only a double pointer to AVClass instead of a required poin...
Definition: opt.h:563
char * size_str
Definition: vf_scale.c:63
char * key
Definition: dict.h:86
int den
Denominator.
Definition: rational.h:60
#define SWS_PARAM_DEFAULT
Definition: swscale.h:73
int slice_y
top of current output slice
Definition: vf_scale.c:68
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:2033
char * value
Definition: dict.h:87
char * in_color_matrix
Definition: vf_scale.c:77
int nb_slices
Definition: vf_scale.c:90
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
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
int height
Definition: frame.h:259
FILE * out
Definition: movenc.c:54
#define AV_DICT_IGNORE_SUFFIX
Return first entry in a dictionary whose first part corresponds to the search key, ignoring the suffix of the found key string.
Definition: dict.h:70
int ff_request_frame(AVFilterLink *link)
Request an input frame from the filter at the other end of the link.
Definition: avfilter.c:405
formats
Definition: signature.h:48
#define FFSWAP(type, a, b)
Definition: common.h:99
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:2275
internal API functions
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
Definition: opt.c:449
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:341
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:609
static const AVFilterPad avfilter_vf_scale2ref_inputs[]
Definition: vf_scale.c:652
const AVPixFmtDescriptor * av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)
Iterate over all pixel format descriptors known to libavutil.
Definition: pixdesc.c:2366