FFmpeg
vf_vignette.c
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1 /*
2  * Copyright (c) 2013 Clément Bœsch
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> /* DBL_MAX */
22 
23 #include "libavutil/opt.h"
24 #include "libavutil/eval.h"
25 #include "libavutil/pixdesc.h"
26 #include "avfilter.h"
27 #include "formats.h"
28 #include "internal.h"
29 #include "video.h"
30 
31 static const char *const var_names[] = {
32  "w", // stream width
33  "h", // stream height
34  "n", // frame count
35  "pts", // presentation timestamp expressed in AV_TIME_BASE units
36  "r", // frame rate
37  "t", // timestamp expressed in seconds
38  "tb", // timebase
39  NULL
40 };
41 
42 enum var_name {
51 };
52 
53 enum EvalMode {
57 };
58 
59 typedef struct VignetteContext {
60  const AVClass *class;
62  int backward;
63  int eval_mode; ///< EvalMode
64 #define DEF_EXPR_FIELDS(name) AVExpr *name##_pexpr; char *name##_expr; double name
65  DEF_EXPR_FIELDS(angle);
66  DEF_EXPR_FIELDS(x0);
67  DEF_EXPR_FIELDS(y0);
68  double var_values[VAR_NB];
69  float *fmap;
71  double dmax;
72  float xscale, yscale;
73  uint32_t dither;
74  int do_dither;
78 
79 #define OFFSET(x) offsetof(VignetteContext, x)
80 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
81 static const AVOption vignette_options[] = {
82  { "angle", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS },
83  { "a", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS },
84  { "x0", "set circle center position on x-axis", OFFSET(x0_expr), AV_OPT_TYPE_STRING, {.str="w/2"}, .flags = FLAGS },
85  { "y0", "set circle center position on y-axis", OFFSET(y0_expr), AV_OPT_TYPE_STRING, {.str="h/2"}, .flags = FLAGS },
86  { "mode", "set forward/backward mode", OFFSET(backward), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS, "mode" },
87  { "forward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, FLAGS, "mode"},
88  { "backward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, FLAGS, "mode"},
89  { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
90  { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
91  { "frame", "eval expressions for each frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
92  { "dither", "set dithering", OFFSET(do_dither), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
93  { "aspect", "set aspect ratio", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 1}, 0, DBL_MAX, .flags = FLAGS },
94  { NULL }
95 };
96 
97 AVFILTER_DEFINE_CLASS(vignette);
98 
100 {
101  VignetteContext *s = ctx->priv;
102 
103 #define PARSE_EXPR(name) do { \
104  int ret = av_expr_parse(&s->name##_pexpr, s->name##_expr, var_names, \
105  NULL, NULL, NULL, NULL, 0, ctx); \
106  if (ret < 0) { \
107  av_log(ctx, AV_LOG_ERROR, "Unable to parse expression for '" \
108  AV_STRINGIFY(name) "'\n"); \
109  return ret; \
110  } \
111 } while (0)
112 
113  PARSE_EXPR(angle);
114  PARSE_EXPR(x0);
115  PARSE_EXPR(y0);
116  return 0;
117 }
118 
120 {
121  VignetteContext *s = ctx->priv;
122  av_freep(&s->fmap);
123  av_expr_free(s->angle_pexpr);
124  av_expr_free(s->x0_pexpr);
125  av_expr_free(s->y0_pexpr);
126 }
127 
129 {
130  static const enum AVPixelFormat pix_fmts[] = {
137  };
139  if (!fmts_list)
140  return AVERROR(ENOMEM);
141  return ff_set_common_formats(ctx, fmts_list);
142 }
143 
144 static double get_natural_factor(const VignetteContext *s, int x, int y)
145 {
146  const int xx = (x - s->x0) * s->xscale;
147  const int yy = (y - s->y0) * s->yscale;
148  const double dnorm = hypot(xx, yy) / s->dmax;
149  if (dnorm > 1) {
150  return 0;
151  } else {
152  const double c = cos(s->angle * dnorm);
153  return (c*c)*(c*c); // do not remove braces, it helps compilers
154  }
155 }
156 
158 {
159  int x, y;
160  float *dst = s->fmap;
161  int dst_linesize = s->fmap_linesize;
162 
163  if (frame) {
164  s->var_values[VAR_N] = inlink->frame_count_out;
165  s->var_values[VAR_T] = TS2T(frame->pts, inlink->time_base);
166  s->var_values[VAR_PTS] = TS2D(frame->pts);
167  } else {
168  s->var_values[VAR_N] = NAN;
169  s->var_values[VAR_T] = NAN;
170  s->var_values[VAR_PTS] = NAN;
171  }
172 
173  s->angle = av_expr_eval(s->angle_pexpr, s->var_values, NULL);
174  s->x0 = av_expr_eval(s->x0_pexpr, s->var_values, NULL);
175  s->y0 = av_expr_eval(s->y0_pexpr, s->var_values, NULL);
176 
177  if (isnan(s->x0) || isnan(s->y0) || isnan(s->angle))
178  s->eval_mode = EVAL_MODE_FRAME;
179 
180  s->angle = av_clipf(s->angle, 0, M_PI_2);
181 
182  if (s->backward) {
183  for (y = 0; y < inlink->h; y++) {
184  for (x = 0; x < inlink->w; x++)
185  dst[x] = 1. / get_natural_factor(s, x, y);
186  dst += dst_linesize;
187  }
188  } else {
189  for (y = 0; y < inlink->h; y++) {
190  for (x = 0; x < inlink->w; x++)
191  dst[x] = get_natural_factor(s, x, y);
192  dst += dst_linesize;
193  }
194  }
195 }
196 
197 static inline double get_dither_value(VignetteContext *s)
198 {
199  double dv = 0;
200  if (s->do_dither) {
201  dv = s->dither / (double)(1LL<<32);
202  s->dither = s->dither * 1664525 + 1013904223;
203  }
204  return dv;
205 }
206 
208 {
209  unsigned x, y, direct = 0;
210  AVFilterContext *ctx = inlink->dst;
211  VignetteContext *s = ctx->priv;
212  AVFilterLink *outlink = ctx->outputs[0];
213  AVFrame *out;
214 
215  if (av_frame_is_writable(in)) {
216  direct = 1;
217  out = in;
218  } else {
219  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
220  if (!out) {
221  av_frame_free(&in);
222  return AVERROR(ENOMEM);
223  }
225  }
226 
227  if (s->eval_mode == EVAL_MODE_FRAME)
228  update_context(s, inlink, in);
229 
230  if (s->desc->flags & AV_PIX_FMT_FLAG_RGB) {
231  uint8_t *dst = out->data[0];
232  const uint8_t *src = in ->data[0];
233  const float *fmap = s->fmap;
234  const int dst_linesize = out->linesize[0];
235  const int src_linesize = in ->linesize[0];
236  const int fmap_linesize = s->fmap_linesize;
237 
238  for (y = 0; y < inlink->h; y++) {
239  uint8_t *dstp = dst;
240  const uint8_t *srcp = src;
241 
242  for (x = 0; x < inlink->w; x++, dstp += 3, srcp += 3) {
243  const float f = fmap[x];
244 
245  dstp[0] = av_clip_uint8(srcp[0] * f + get_dither_value(s));
246  dstp[1] = av_clip_uint8(srcp[1] * f + get_dither_value(s));
247  dstp[2] = av_clip_uint8(srcp[2] * f + get_dither_value(s));
248  }
249  dst += dst_linesize;
250  src += src_linesize;
251  fmap += fmap_linesize;
252  }
253  } else {
254  int plane;
255 
256  for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
257  uint8_t *dst = out->data[plane];
258  const uint8_t *src = in ->data[plane];
259  const float *fmap = s->fmap;
260  const int dst_linesize = out->linesize[plane];
261  const int src_linesize = in ->linesize[plane];
262  const int fmap_linesize = s->fmap_linesize;
263  const int chroma = plane == 1 || plane == 2;
264  const int hsub = chroma ? s->desc->log2_chroma_w : 0;
265  const int vsub = chroma ? s->desc->log2_chroma_h : 0;
266  const int w = AV_CEIL_RSHIFT(inlink->w, hsub);
267  const int h = AV_CEIL_RSHIFT(inlink->h, vsub);
268 
269  for (y = 0; y < h; y++) {
270  uint8_t *dstp = dst;
271  const uint8_t *srcp = src;
272 
273  for (x = 0; x < w; x++) {
274  const double dv = get_dither_value(s);
275  if (chroma) *dstp++ = av_clip_uint8(fmap[x << hsub] * (*srcp++ - 127) + 127 + dv);
276  else *dstp++ = av_clip_uint8(fmap[x ] * *srcp++ + dv);
277  }
278  dst += dst_linesize;
279  src += src_linesize;
280  fmap += fmap_linesize << vsub;
281  }
282  }
283  }
284 
285  if (!direct)
286  av_frame_free(&in);
287  return ff_filter_frame(outlink, out);
288 }
289 
291 {
292  VignetteContext *s = inlink->dst->priv;
293  AVRational sar = inlink->sample_aspect_ratio;
294 
295  s->desc = av_pix_fmt_desc_get(inlink->format);
296  s->var_values[VAR_W] = inlink->w;
297  s->var_values[VAR_H] = inlink->h;
298  s->var_values[VAR_TB] = av_q2d(inlink->time_base);
299  s->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ?
300  NAN : av_q2d(inlink->frame_rate);
301 
302  if (!sar.num || !sar.den)
303  sar.num = sar.den = 1;
304  if (sar.num > sar.den) {
305  s->xscale = av_q2d(av_div_q(sar, s->aspect));
306  s->yscale = 1;
307  } else {
308  s->yscale = av_q2d(av_div_q(s->aspect, sar));
309  s->xscale = 1;
310  }
311  s->dmax = hypot(inlink->w / 2., inlink->h / 2.);
312  av_log(s, AV_LOG_DEBUG, "xscale=%f yscale=%f dmax=%f\n",
313  s->xscale, s->yscale, s->dmax);
314 
315  s->fmap_linesize = FFALIGN(inlink->w, 32);
316  s->fmap = av_malloc_array(s->fmap_linesize, inlink->h * sizeof(*s->fmap));
317  if (!s->fmap)
318  return AVERROR(ENOMEM);
319 
320  if (s->eval_mode == EVAL_MODE_INIT)
322 
323  return 0;
324 }
325 
326 static const AVFilterPad vignette_inputs[] = {
327  {
328  .name = "default",
329  .type = AVMEDIA_TYPE_VIDEO,
330  .filter_frame = filter_frame,
331  .config_props = config_props,
332  },
333  { NULL }
334 };
335 
336 static const AVFilterPad vignette_outputs[] = {
337  {
338  .name = "default",
339  .type = AVMEDIA_TYPE_VIDEO,
340  },
341  { NULL }
342 };
343 
345  .name = "vignette",
346  .description = NULL_IF_CONFIG_SMALL("Make or reverse a vignette effect."),
347  .priv_size = sizeof(VignetteContext),
348  .init = init,
349  .uninit = uninit,
353  .priv_class = &vignette_class,
355 };
var_names
static const char *const var_names[]
Definition: vf_vignette.c:31
VignetteContext::fmap_linesize
int fmap_linesize
Definition: vf_vignette.c:70
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:97
direct
static void direct(const float *in, const FFTComplex *ir, int len, float *out)
Definition: af_afir.c:61
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_vignette.c:119
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
VAR_T
@ VAR_T
Definition: vf_vignette.c:48
ff_make_format_list
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:286
out
FILE * out
Definition: movenc.c:54
vignette_options
static const AVOption vignette_options[]
Definition: vf_vignette.c:81
VAR_NB
@ VAR_NB
Definition: vf_vignette.c:50
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:2540
av_div_q
AVRational av_div_q(AVRational b, AVRational c)
Divide one rational by another.
Definition: rational.c:88
VignetteContext
Definition: vf_vignette.c:59
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
VAR_TB
@ VAR_TB
Definition: vf_vignette.c:49
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
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
pixdesc.h
w
uint8_t w
Definition: llviddspenc.c:38
VignetteContext::var_values
double var_values[VAR_NB]
Definition: vf_vignette.c:68
VignetteContext::do_dither
int do_dither
Definition: vf_vignette.c:74
M_PI_2
#define M_PI_2
Definition: mathematics.h:55
AVOption
AVOption.
Definition: opt.h:247
chroma
static av_always_inline void chroma(WaveformContext *s, AVFrame *in, AVFrame *out, int component, int intensity, int offset_y, int offset_x, int column, int mirror, int jobnr, int nb_jobs)
Definition: vf_waveform.c:1623
get_natural_factor
static double get_natural_factor(const VignetteContext *s, int x, int y)
Definition: vf_vignette.c:144
float.h
AV_PIX_FMT_BGR24
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
AV_PIX_FMT_YUV440P
@ AV_PIX_FMT_YUV440P
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
Definition: pixfmt.h:99
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:149
AV_OPT_TYPE_RATIONAL
@ AV_OPT_TYPE_RATIONAL
Definition: opt.h:229
video.h
vignette_inputs
static const AVFilterPad vignette_inputs[]
Definition: vf_vignette.c:326
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
FLAGS
#define FLAGS
Definition: vf_vignette.c:80
hsub
static void hsub(htype *dst, const htype *src, int bins)
Definition: vf_median.c:74
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:64
formats.h
ff_vf_vignette
const AVFilter ff_vf_vignette
Definition: vf_vignette.c:344
init
static av_cold int init(AVFilterContext *ctx)
Definition: vf_vignette.c:99
VignetteContext::dmax
double dmax
Definition: vf_vignette.c:71
VignetteContext::DEF_EXPR_FIELDS
DEF_EXPR_FIELDS(angle)
av_expr_free
void av_expr_free(AVExpr *e)
Free a parsed expression previously created with av_expr_parse().
Definition: eval.c:336
AVRational::num
int num
Numerator.
Definition: rational.h:59
OFFSET
#define OFFSET(x)
Definition: vf_vignette.c:79
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:54
TS2T
#define TS2T(ts, tb)
Definition: internal.h:209
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
var_name
var_name
Definition: setts_bsf.c:50
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
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_vignette.c:128
s
#define s(width, name)
Definition: cbs_vp9.c:257
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58
av_q2d
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
VAR_N
@ VAR_N
Definition: vf_vignette.c:45
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:290
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_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
VignetteContext::xscale
float xscale
Definition: vf_vignette.c:72
NAN
#define NAN
Definition: mathematics.h:64
f
#define f(width, name)
Definition: cbs_vp9.c:255
EVAL_MODE_INIT
@ EVAL_MODE_INIT
Definition: vf_vignette.c:54
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
TS2D
#define TS2D(ts)
Definition: internal.h:208
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:537
VignetteContext::yscale
float yscale
Definition: vf_vignette.c:72
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
isnan
#define isnan(x)
Definition: libm.h:340
av_clipf
#define av_clipf
Definition: common.h:170
src
#define src
Definition: vp8dsp.c:255
VAR_H
@ VAR_H
Definition: vf_vignette.c:44
VignetteContext::dither
uint32_t dither
Definition: vf_vignette.c:73
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
VAR_R
@ VAR_R
Definition: vf_vignette.c:47
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:116
EVAL_MODE_FRAME
@ EVAL_MODE_FRAME
Definition: vf_vignette.c:55
PARSE_EXPR
#define PARSE_EXPR(name)
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
config_props
static int config_props(AVFilterLink *inlink)
Definition: vf_vignette.c:290
hypot
static av_const double hypot(double x, double y)
Definition: libm.h:366
av_frame_is_writable
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Definition: frame.c:473
VignetteContext::scale
AVRational scale
Definition: vf_vignette.c:76
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
EVAL_MODE_NB
@ EVAL_MODE_NB
Definition: vf_vignette.c:56
VignetteContext::eval_mode
int eval_mode
EvalMode.
Definition: vf_vignette.c:63
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(vignette)
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:32
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_vignette.c:207
VignetteContext::aspect
AVRational aspect
Definition: vf_vignette.c:75
EvalMode
EvalMode
Definition: af_volume.h:39
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:60
VignetteContext::desc
const AVPixFmtDescriptor * desc
Definition: vf_vignette.c:61
AVFilter
Filter definition.
Definition: avfilter.h:145
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_W
@ VAR_W
Definition: vf_vignette.c:43
AVRational::den
int den
Denominator.
Definition: rational.h:60
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:224
avfilter.h
update_context
static void update_context(VignetteContext *s, AVFilterLink *inlink, AVFrame *frame)
Definition: vf_vignette.c:157
av_clip_uint8
#define av_clip_uint8
Definition: common.h:128
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
AVFilterContext
An instance of a filter.
Definition: avfilter.h:333
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
VignetteContext::fmap
float * fmap
Definition: vf_vignette.c:69
VignetteContext::backward
int backward
Definition: vf_vignette.c:62
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:48
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:241
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
AV_PIX_FMT_YUV411P
@ AV_PIX_FMT_YUV411P
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:73
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
VAR_PTS
@ VAR_PTS
Definition: vf_vignette.c:46
AV_PIX_FMT_YUV410P
@ AV_PIX_FMT_YUV410P
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:72
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
get_dither_value
static double get_dither_value(VignetteContext *s)
Definition: vf_vignette.c:197
h
h
Definition: vp9dsp_template.c:2038
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:228
vignette_outputs
static const AVFilterPad vignette_outputs[]
Definition: vf_vignette.c:336
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:233