FFmpeg
vf_edgedetect.c
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1 /*
2  * Copyright (c) 2012-2014 Clément Bœsch <u pkh me>
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  * Edge detection filter
24  *
25  * @see https://en.wikipedia.org/wiki/Canny_edge_detector
26  */
27 
28 #include "libavutil/avassert.h"
29 #include "libavutil/imgutils.h"
30 #include "libavutil/opt.h"
31 #include "avfilter.h"
32 #include "formats.h"
33 #include "internal.h"
34 #include "video.h"
35 
36 #define PLANE_R 0x4
37 #define PLANE_G 0x1
38 #define PLANE_B 0x2
39 #define PLANE_Y 0x1
40 #define PLANE_U 0x2
41 #define PLANE_V 0x4
42 #define PLANE_A 0x8
43 
44 enum FilterMode {
49 };
50 
51 struct plane_info {
52  uint8_t *tmpbuf;
53  uint16_t *gradients;
54  char *directions;
55  int width, height;
56 };
57 
58 typedef struct EdgeDetectContext {
59  const AVClass *class;
60  struct plane_info planes[3];
62  int nb_planes;
63  double low, high;
64  uint8_t low_u8, high_u8;
65  int mode;
67 
68 #define OFFSET(x) offsetof(EdgeDetectContext, x)
69 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
70 static const AVOption edgedetect_options[] = {
71  { "high", "set high threshold", OFFSET(high), AV_OPT_TYPE_DOUBLE, {.dbl=50/255.}, 0, 1, FLAGS },
72  { "low", "set low threshold", OFFSET(low), AV_OPT_TYPE_DOUBLE, {.dbl=20/255.}, 0, 1, FLAGS },
73  { "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_WIRES}, 0, NB_MODE-1, FLAGS, "mode" },
74  { "wires", "white/gray wires on black", 0, AV_OPT_TYPE_CONST, {.i64=MODE_WIRES}, INT_MIN, INT_MAX, FLAGS, "mode" },
75  { "colormix", "mix colors", 0, AV_OPT_TYPE_CONST, {.i64=MODE_COLORMIX}, INT_MIN, INT_MAX, FLAGS, "mode" },
76  { "canny", "detect edges on planes", 0, AV_OPT_TYPE_CONST, {.i64=MODE_CANNY}, INT_MIN, INT_MAX, FLAGS, "mode" },
77  { "planes", "set planes to filter", OFFSET(filter_planes), AV_OPT_TYPE_FLAGS, {.i64=7}, 1, 0x7, FLAGS, "flags" },
78  { "y", "filter luma plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_Y}, 0, 0, FLAGS, "flags" },
79  { "u", "filter u plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_U}, 0, 0, FLAGS, "flags" },
80  { "v", "filter v plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_V}, 0, 0, FLAGS, "flags" },
81  { "r", "filter red plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_R}, 0, 0, FLAGS, "flags" },
82  { "g", "filter green plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_G}, 0, 0, FLAGS, "flags" },
83  { "b", "filter blue plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_B}, 0, 0, FLAGS, "flags" },
84  { NULL }
85 };
86 
88 
90 {
92 
93  edgedetect->low_u8 = edgedetect->low * 255. + .5;
94  edgedetect->high_u8 = edgedetect->high * 255. + .5;
95  return 0;
96 }
97 
99 {
100  const EdgeDetectContext *edgedetect = ctx->priv;
101  static const enum AVPixelFormat wires_pix_fmts[] = {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE};
103  static const enum AVPixelFormat colormix_pix_fmts[] = {AV_PIX_FMT_GBRP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE};
104  AVFilterFormats *fmts_list;
105  const enum AVPixelFormat *pix_fmts = NULL;
106 
107  if (edgedetect->mode == MODE_WIRES) {
108  pix_fmts = wires_pix_fmts;
109  } else if (edgedetect->mode == MODE_COLORMIX) {
110  pix_fmts = colormix_pix_fmts;
111  } else if (edgedetect->mode == MODE_CANNY) {
112  pix_fmts = canny_pix_fmts;
113  } else {
114  av_assert0(0);
115  }
116  fmts_list = ff_make_format_list(pix_fmts);
117  if (!fmts_list)
118  return AVERROR(ENOMEM);
119  return ff_set_common_formats(ctx, fmts_list);
120 }
121 
123 {
124  int p;
125  AVFilterContext *ctx = inlink->dst;
128 
129  edgedetect->nb_planes = inlink->format == AV_PIX_FMT_GRAY8 ? 1 : 3;
130  for (p = 0; p < edgedetect->nb_planes; p++) {
131  struct plane_info *plane = &edgedetect->planes[p];
132  int vsub = p ? desc->log2_chroma_h : 0;
133  int hsub = p ? desc->log2_chroma_w : 0;
134 
135  plane->width = AV_CEIL_RSHIFT(inlink->w, hsub);
136  plane->height = AV_CEIL_RSHIFT(inlink->h, vsub);
137  plane->tmpbuf = av_malloc(plane->width * plane->height);
138  plane->gradients = av_calloc(plane->width * plane->height, sizeof(*plane->gradients));
139  plane->directions = av_malloc(plane->width * plane->height);
140  if (!plane->tmpbuf || !plane->gradients || !plane->directions)
141  return AVERROR(ENOMEM);
142  }
143  return 0;
144 }
145 
146 static void gaussian_blur(AVFilterContext *ctx, int w, int h,
147  uint8_t *dst, int dst_linesize,
148  const uint8_t *src, int src_linesize)
149 {
150  int i, j;
151 
152  memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
153  if (h > 1) {
154  memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
155  }
156  for (j = 2; j < h - 2; j++) {
157  dst[0] = src[0];
158  if (w > 1)
159  dst[1] = src[1];
160  for (i = 2; i < w - 2; i++) {
161  /* Gaussian mask of size 5x5 with sigma = 1.4 */
162  dst[i] = ((src[-2*src_linesize + i-2] + src[2*src_linesize + i-2]) * 2
163  + (src[-2*src_linesize + i-1] + src[2*src_linesize + i-1]) * 4
164  + (src[-2*src_linesize + i ] + src[2*src_linesize + i ]) * 5
165  + (src[-2*src_linesize + i+1] + src[2*src_linesize + i+1]) * 4
166  + (src[-2*src_linesize + i+2] + src[2*src_linesize + i+2]) * 2
167 
168  + (src[ -src_linesize + i-2] + src[ src_linesize + i-2]) * 4
169  + (src[ -src_linesize + i-1] + src[ src_linesize + i-1]) * 9
170  + (src[ -src_linesize + i ] + src[ src_linesize + i ]) * 12
171  + (src[ -src_linesize + i+1] + src[ src_linesize + i+1]) * 9
172  + (src[ -src_linesize + i+2] + src[ src_linesize + i+2]) * 4
173 
174  + src[i-2] * 5
175  + src[i-1] * 12
176  + src[i ] * 15
177  + src[i+1] * 12
178  + src[i+2] * 5) / 159;
179  }
180  if (w > 2)
181  dst[i ] = src[i ];
182  if (w > 3)
183  dst[i + 1] = src[i + 1];
184 
185  dst += dst_linesize;
186  src += src_linesize;
187  }
188  if (h > 2) {
189  memcpy(dst, src, w); dst += dst_linesize; src += src_linesize;
190  }
191  if (h > 3)
192  memcpy(dst, src, w);
193 }
194 
195 enum {
200 };
201 
202 static int get_rounded_direction(int gx, int gy)
203 {
204  /* reference angles:
205  * tan( pi/8) = sqrt(2)-1
206  * tan(3pi/8) = sqrt(2)+1
207  * Gy/Gx is the tangent of the angle (theta), so Gy/Gx is compared against
208  * <ref-angle>, or more simply Gy against <ref-angle>*Gx
209  *
210  * Gx and Gy bounds = [-1020;1020], using 16-bit arithmetic:
211  * round((sqrt(2)-1) * (1<<16)) = 27146
212  * round((sqrt(2)+1) * (1<<16)) = 158218
213  */
214  if (gx) {
215  int tanpi8gx, tan3pi8gx;
216 
217  if (gx < 0)
218  gx = -gx, gy = -gy;
219  gy *= (1 << 16);
220  tanpi8gx = 27146 * gx;
221  tan3pi8gx = 158218 * gx;
222  if (gy > -tan3pi8gx && gy < -tanpi8gx) return DIRECTION_45UP;
223  if (gy > -tanpi8gx && gy < tanpi8gx) return DIRECTION_HORIZONTAL;
224  if (gy > tanpi8gx && gy < tan3pi8gx) return DIRECTION_45DOWN;
225  }
226  return DIRECTION_VERTICAL;
227 }
228 
229 static void sobel(int w, int h,
230  uint16_t *dst, int dst_linesize,
231  int8_t *dir, int dir_linesize,
232  const uint8_t *src, int src_linesize)
233 {
234  int i, j;
235 
236  for (j = 1; j < h - 1; j++) {
237  dst += dst_linesize;
238  dir += dir_linesize;
239  src += src_linesize;
240  for (i = 1; i < w - 1; i++) {
241  const int gx =
242  -1*src[-src_linesize + i-1] + 1*src[-src_linesize + i+1]
243  -2*src[ i-1] + 2*src[ i+1]
244  -1*src[ src_linesize + i-1] + 1*src[ src_linesize + i+1];
245  const int gy =
246  -1*src[-src_linesize + i-1] + 1*src[ src_linesize + i-1]
247  -2*src[-src_linesize + i ] + 2*src[ src_linesize + i ]
248  -1*src[-src_linesize + i+1] + 1*src[ src_linesize + i+1];
249 
250  dst[i] = FFABS(gx) + FFABS(gy);
251  dir[i] = get_rounded_direction(gx, gy);
252  }
253  }
254 }
255 
256 static void non_maximum_suppression(int w, int h,
257  uint8_t *dst, int dst_linesize,
258  const int8_t *dir, int dir_linesize,
259  const uint16_t *src, int src_linesize)
260 {
261  int i, j;
262 
263 #define COPY_MAXIMA(ay, ax, by, bx) do { \
264  if (src[i] > src[(ay)*src_linesize + i+(ax)] && \
265  src[i] > src[(by)*src_linesize + i+(bx)]) \
266  dst[i] = av_clip_uint8(src[i]); \
267 } while (0)
268 
269  for (j = 1; j < h - 1; j++) {
270  dst += dst_linesize;
271  dir += dir_linesize;
272  src += src_linesize;
273  for (i = 1; i < w - 1; i++) {
274  switch (dir[i]) {
275  case DIRECTION_45UP: COPY_MAXIMA( 1, -1, -1, 1); break;
276  case DIRECTION_45DOWN: COPY_MAXIMA(-1, -1, 1, 1); break;
277  case DIRECTION_HORIZONTAL: COPY_MAXIMA( 0, -1, 0, 1); break;
278  case DIRECTION_VERTICAL: COPY_MAXIMA(-1, 0, 1, 0); break;
279  }
280  }
281  }
282 }
283 
284 static void double_threshold(int low, int high, int w, int h,
285  uint8_t *dst, int dst_linesize,
286  const uint8_t *src, int src_linesize)
287 {
288  int i, j;
289 
290  for (j = 0; j < h; j++) {
291  for (i = 0; i < w; i++) {
292  if (src[i] > high) {
293  dst[i] = src[i];
294  continue;
295  }
296 
297  if (!(!i || i == w - 1 || !j || j == h - 1) &&
298  src[i] > low &&
299  (src[-src_linesize + i-1] > high ||
300  src[-src_linesize + i ] > high ||
301  src[-src_linesize + i+1] > high ||
302  src[ i-1] > high ||
303  src[ i+1] > high ||
304  src[ src_linesize + i-1] > high ||
305  src[ src_linesize + i ] > high ||
306  src[ src_linesize + i+1] > high))
307  dst[i] = src[i];
308  else
309  dst[i] = 0;
310  }
311  dst += dst_linesize;
312  src += src_linesize;
313  }
314 }
315 
316 static void color_mix(int w, int h,
317  uint8_t *dst, int dst_linesize,
318  const uint8_t *src, int src_linesize)
319 {
320  int i, j;
321 
322  for (j = 0; j < h; j++) {
323  for (i = 0; i < w; i++)
324  dst[i] = (dst[i] + src[i]) >> 1;
325  dst += dst_linesize;
326  src += src_linesize;
327  }
328 }
329 
331 {
332  AVFilterContext *ctx = inlink->dst;
334  AVFilterLink *outlink = ctx->outputs[0];
335  int p, direct = 0;
336  AVFrame *out;
337 
338  if (edgedetect->mode != MODE_COLORMIX && av_frame_is_writable(in)) {
339  direct = 1;
340  out = in;
341  } else {
342  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
343  if (!out) {
344  av_frame_free(&in);
345  return AVERROR(ENOMEM);
346  }
348  }
349 
350  for (p = 0; p < edgedetect->nb_planes; p++) {
351  struct plane_info *plane = &edgedetect->planes[p];
352  uint8_t *tmpbuf = plane->tmpbuf;
353  uint16_t *gradients = plane->gradients;
354  int8_t *directions = plane->directions;
355  const int width = plane->width;
356  const int height = plane->height;
357 
358  if (!((1 << p) & edgedetect->filter_planes)) {
359  if (!direct)
360  av_image_copy_plane(out->data[p], out->linesize[p],
361  in->data[p], in->linesize[p],
362  width, height);
363  continue;
364  }
365 
366  /* gaussian filter to reduce noise */
368  tmpbuf, width,
369  in->data[p], in->linesize[p]);
370 
371  /* compute the 16-bits gradients and directions for the next step */
372  sobel(width, height,
373  gradients, width,
375  tmpbuf, width);
376 
377  /* non_maximum_suppression() will actually keep & clip what's necessary and
378  * ignore the rest, so we need a clean output buffer */
379  memset(tmpbuf, 0, width * height);
381  tmpbuf, width,
383  gradients, width);
384 
385  /* keep high values, or low values surrounded by high values */
386  double_threshold(edgedetect->low_u8, edgedetect->high_u8,
387  width, height,
388  out->data[p], out->linesize[p],
389  tmpbuf, width);
390 
391  if (edgedetect->mode == MODE_COLORMIX) {
393  out->data[p], out->linesize[p],
394  in->data[p], in->linesize[p]);
395  }
396  }
397 
398  if (!direct)
399  av_frame_free(&in);
400  return ff_filter_frame(outlink, out);
401 }
402 
404 {
405  int p;
407 
408  for (p = 0; p < edgedetect->nb_planes; p++) {
409  struct plane_info *plane = &edgedetect->planes[p];
410  av_freep(&plane->tmpbuf);
411  av_freep(&plane->gradients);
412  av_freep(&plane->directions);
413  }
414 }
415 
416 static const AVFilterPad edgedetect_inputs[] = {
417  {
418  .name = "default",
419  .type = AVMEDIA_TYPE_VIDEO,
420  .config_props = config_props,
421  .filter_frame = filter_frame,
422  },
423  { NULL }
424 };
425 
426 static const AVFilterPad edgedetect_outputs[] = {
427  {
428  .name = "default",
429  .type = AVMEDIA_TYPE_VIDEO,
430  },
431  { NULL }
432 };
433 
435  .name = "edgedetect",
436  .description = NULL_IF_CONFIG_SMALL("Detect and draw edge."),
437  .priv_size = sizeof(EdgeDetectContext),
438  .init = init,
439  .uninit = uninit,
443  .priv_class = &edgedetect_class,
445 };
ff_get_video_buffer
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
direct
static void direct(const float *in, const FFTComplex *ir, int len, float *out)
Definition: af_afir.c:60
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
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
ff_make_format_list
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:286
DIRECTION_45DOWN
@ DIRECTION_45DOWN
Definition: vf_edgedetect.c:197
out
FILE * out
Definition: movenc.c:54
ff_filter_frame
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:978
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2541
PLANE_B
#define PLANE_B
Definition: vf_edgedetect.c:38
edgedetect
This document is a tutorial initiation for writing simple filters in libavfilter libavfilter is which means that it is highly recommended that you submit your filters to the FFmpeg development mailing list and make sure that they are applied your filters are likely to have a very short lifetime due to more or less regular internal API and a limited and testing changes the pixels in whatever fashion you and outputs the modified frame The most simple way of doing this is to take a similar filter We ll pick edgedetect
Definition: writing_filters.txt:16
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
gaussian_blur
static void gaussian_blur(AVFilterContext *ctx, int w, int h, uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize)
Definition: vf_edgedetect.c:146
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:111
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
w
uint8_t w
Definition: llviddspenc.c:39
AVOption
AVOption.
Definition: opt.h:248
get_rounded_direction
static int get_rounded_direction(int gx, int gy)
Definition: vf_edgedetect.c:202
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:149
video.h
sobel
static void sobel(int w, int h, uint16_t *dst, int dst_linesize, int8_t *dir, int dir_linesize, const uint8_t *src, int src_linesize)
Definition: vf_edgedetect.c:229
non_maximum_suppression
static void non_maximum_suppression(int w, int h, uint8_t *dst, int dst_linesize, const int8_t *dir, int dir_linesize, const uint16_t *src, int src_linesize)
Definition: vf_edgedetect.c:256
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
av_image_copy_plane
void av_image_copy_plane(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int bytewidth, int height)
Copy image plane from src to dst.
Definition: imgutils.c:374
hsub
static void hsub(htype *dst, const htype *src, int bins)
Definition: vf_median.c:75
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:65
formats.h
double_threshold
static void double_threshold(int low, int high, int w, int h, uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize)
Definition: vf_edgedetect.c:284
DIRECTION_45UP
@ DIRECTION_45UP
Definition: vf_edgedetect.c:196
plane_info::height
int height
Definition: vf_edgedetect.c:55
FilterMode
FilterMode
Definition: vp9.h:64
MODE_COLORMIX
@ MODE_COLORMIX
Definition: vf_edgedetect.c:46
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:54
PLANE_V
#define PLANE_V
Definition: vf_edgedetect.c:41
avassert.h
av_cold
#define av_cold
Definition: attributes.h:90
inputs
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
Definition: filter_design.txt:243
ff_set_common_formats
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:580
width
#define width
COPY_MAXIMA
#define COPY_MAXIMA(ay, ax, by, bx)
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58
DIRECTION_VERTICAL
@ DIRECTION_VERTICAL
Definition: vf_edgedetect.c:199
AV_OPT_TYPE_DOUBLE
@ AV_OPT_TYPE_DOUBLE
Definition: opt.h:227
MODE_CANNY
@ MODE_CANNY
Definition: vf_edgedetect.c:47
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:290
MODE_WIRES
@ MODE_WIRES
Definition: vf_edgedetect.c:45
ctx
AVFormatContext * ctx
Definition: movenc.c:48
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
edgedetect_inputs
static const AVFilterPad edgedetect_inputs[]
Definition: vf_edgedetect.c:416
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
init
static av_cold int init(AVFilterContext *ctx)
Definition: vf_edgedetect.c:89
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
NULL
#define NULL
Definition: coverity.c:32
av_frame_copy_props
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
Definition: frame.c:536
EdgeDetectContext::high
double high
Definition: vf_edgedetect.c:63
PLANE_G
#define PLANE_G
Definition: vf_edgedetect.c:37
ff_vf_edgedetect
const AVFilter ff_vf_edgedetect
Definition: vf_edgedetect.c:434
src
#define src
Definition: vp8dsp.c:255
plane_info::directions
char * directions
Definition: vf_edgedetect.c:54
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_edgedetect.c:330
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_edgedetect.c:403
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
EdgeDetectContext::mode
int mode
Definition: vf_edgedetect.c:65
av_frame_is_writable
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:472
height
#define height
plane_info::gradients
uint16_t * gradients
Definition: vf_edgedetect.c:53
plane_info::width
int width
Definition: vf_edgedetect.c:55
DIRECTION_HORIZONTAL
@ DIRECTION_HORIZONTAL
Definition: vf_edgedetect.c:198
internal.h
AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
Definition: avfilter.h:126
EdgeDetectContext::low
double low
Definition: vf_edgedetect.c:63
i
int i
Definition: input.c:407
PLANE_R
#define PLANE_R
Definition: vf_edgedetect.c:36
EdgeDetectContext::planes
struct plane_info planes[3]
Definition: vf_edgedetect.c:60
EdgeDetectContext::filter_planes
int filter_planes
Definition: vf_edgedetect.c:61
plane_info
Definition: vf_edgedetect.c:51
EdgeDetectContext::low_u8
uint8_t low_u8
Definition: vf_edgedetect.c:64
plane_info::tmpbuf
uint8_t * tmpbuf
Definition: vf_edgedetect.c:52
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:60
config_props
static int config_props(AVFilterLink *inlink)
Definition: vf_edgedetect.c:122
AVFilter
Filter definition.
Definition: avfilter.h:145
EdgeDetectContext::high_u8
uint8_t high_u8
Definition: vf_edgedetect.c:64
edgedetect_options
static const AVOption edgedetect_options[]
Definition: vf_edgedetect.c:70
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_edgedetect.c:98
PLANE_Y
#define PLANE_Y
Definition: vf_edgedetect.c:39
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:252
mode
mode
Definition: ebur128.h:83
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
avfilter.h
EdgeDetectContext::nb_planes
int nb_planes
Definition: vf_edgedetect.c:62
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(edgedetect)
AV_PIX_FMT_YUV444P
@ AV_PIX_FMT_YUV444P
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
OFFSET
#define OFFSET(x)
Definition: vf_edgedetect.c:68
AVFilterContext
An instance of a filter.
Definition: avfilter.h:333
AV_PIX_FMT_GBRP
@ AV_PIX_FMT_GBRP
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:158
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
FLAGS
#define FLAGS
Definition: vf_edgedetect.c:69
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
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:70
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
PLANE_U
#define PLANE_U
Definition: vf_edgedetect.c:40
AV_OPT_TYPE_FLAGS
@ AV_OPT_TYPE_FLAGS
Definition: opt.h:224
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
NB_MODE
@ NB_MODE
Definition: vf_edgedetect.c:48
h
h
Definition: vp9dsp_template.c:2038
edgedetect_outputs
static const AVFilterPad edgedetect_outputs[]
Definition: vf_edgedetect.c:426
color_mix
static void color_mix(int w, int h, uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize)
Definition: vf_edgedetect.c:316
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:234
EdgeDetectContext
Definition: vf_edgedetect.c:58