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/avassert.h"
26 #include "libavutil/pixdesc.h"
27 #include "avfilter.h"
28 #include "formats.h"
29 #include "internal.h"
30 #include "video.h"
31 
32 static const char *const var_names[] = {
33  "w", // stream width
34  "h", // stream height
35  "n", // frame count
36  "pts", // presentation timestamp expressed in AV_TIME_BASE units
37  "r", // frame rate
38  "t", // timestamp expressed in seconds
39  "tb", // timebase
40  NULL
41 };
42 
43 enum var_name {
52 };
53 
54 enum EvalMode {
58 };
59 
60 typedef struct VignetteContext {
61  const AVClass *class;
63  int backward;
64  int eval_mode; ///< EvalMode
65 #define DEF_EXPR_FIELDS(name) AVExpr *name##_pexpr; char *name##_expr; double name
66  DEF_EXPR_FIELDS(angle);
67  DEF_EXPR_FIELDS(x0);
68  DEF_EXPR_FIELDS(y0);
69  double var_values[VAR_NB];
70  float *fmap;
72  double dmax;
73  float xscale, yscale;
74  uint32_t dither;
75  int do_dither;
79 
80 #define OFFSET(x) offsetof(VignetteContext, x)
81 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
82 static const AVOption vignette_options[] = {
83  { "angle", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS },
84  { "a", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS },
85  { "x0", "set circle center position on x-axis", OFFSET(x0_expr), AV_OPT_TYPE_STRING, {.str="w/2"}, .flags = FLAGS },
86  { "y0", "set circle center position on y-axis", OFFSET(y0_expr), AV_OPT_TYPE_STRING, {.str="h/2"}, .flags = FLAGS },
87  { "mode", "set forward/backward mode", OFFSET(backward), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS, "mode" },
88  { "forward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, FLAGS, "mode"},
89  { "backward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, FLAGS, "mode"},
90  { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
91  { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
92  { "frame", "eval expressions for each frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
93  { "dither", "set dithering", OFFSET(do_dither), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
94  { "aspect", "set aspect ratio", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 1}, 0, DBL_MAX, .flags = FLAGS },
95  { NULL }
96 };
97 
98 AVFILTER_DEFINE_CLASS(vignette);
99 
101 {
102  VignetteContext *s = ctx->priv;
103 
104 #define PARSE_EXPR(name) do { \
105  int ret = av_expr_parse(&s->name##_pexpr, s->name##_expr, var_names, \
106  NULL, NULL, NULL, NULL, 0, ctx); \
107  if (ret < 0) { \
108  av_log(ctx, AV_LOG_ERROR, "Unable to parse expression for '" \
109  AV_STRINGIFY(name) "'\n"); \
110  return ret; \
111  } \
112 } while (0)
113 
114  PARSE_EXPR(angle);
115  PARSE_EXPR(x0);
116  PARSE_EXPR(y0);
117  return 0;
118 }
119 
121 {
122  VignetteContext *s = ctx->priv;
123  av_freep(&s->fmap);
124  av_expr_free(s->angle_pexpr);
125  av_expr_free(s->x0_pexpr);
126  av_expr_free(s->y0_pexpr);
127 }
128 
130 {
131  static const enum AVPixelFormat pix_fmts[] = {
138  };
140  if (!fmts_list)
141  return AVERROR(ENOMEM);
142  return ff_set_common_formats(ctx, fmts_list);
143 }
144 
145 static double get_natural_factor(const VignetteContext *s, int x, int y)
146 {
147  const int xx = (x - s->x0) * s->xscale;
148  const int yy = (y - s->y0) * s->yscale;
149  const double dnorm = hypot(xx, yy) / s->dmax;
150  if (dnorm > 1) {
151  return 0;
152  } else {
153  const double c = cos(s->angle * dnorm);
154  return (c*c)*(c*c); // do not remove braces, it helps compilers
155  }
156 }
157 
159 {
160  int x, y;
161  float *dst = s->fmap;
162  int dst_linesize = s->fmap_linesize;
163 
164  if (frame) {
165  s->var_values[VAR_N] = inlink->frame_count_out;
166  s->var_values[VAR_T] = TS2T(frame->pts, inlink->time_base);
167  s->var_values[VAR_PTS] = TS2D(frame->pts);
168  } else {
169  s->var_values[VAR_N] = NAN;
170  s->var_values[VAR_T] = NAN;
171  s->var_values[VAR_PTS] = NAN;
172  }
173 
174  s->angle = av_expr_eval(s->angle_pexpr, s->var_values, NULL);
175  s->x0 = av_expr_eval(s->x0_pexpr, s->var_values, NULL);
176  s->y0 = av_expr_eval(s->y0_pexpr, s->var_values, NULL);
177 
178  if (isnan(s->x0) || isnan(s->y0) || isnan(s->angle))
179  s->eval_mode = EVAL_MODE_FRAME;
180 
181  s->angle = av_clipf(s->angle, 0, M_PI_2);
182 
183  if (s->backward) {
184  for (y = 0; y < inlink->h; y++) {
185  for (x = 0; x < inlink->w; x++)
186  dst[x] = 1. / get_natural_factor(s, x, y);
187  dst += dst_linesize;
188  }
189  } else {
190  for (y = 0; y < inlink->h; y++) {
191  for (x = 0; x < inlink->w; x++)
192  dst[x] = get_natural_factor(s, x, y);
193  dst += dst_linesize;
194  }
195  }
196 }
197 
198 static inline double get_dither_value(VignetteContext *s)
199 {
200  double dv = 0;
201  if (s->do_dither) {
202  dv = s->dither / (double)(1LL<<32);
203  s->dither = s->dither * 1664525 + 1013904223;
204  }
205  return dv;
206 }
207 
209 {
210  unsigned x, y, direct = 0;
211  AVFilterContext *ctx = inlink->dst;
212  VignetteContext *s = ctx->priv;
213  AVFilterLink *outlink = ctx->outputs[0];
214  AVFrame *out;
215 
216  if (av_frame_is_writable(in)) {
217  direct = 1;
218  out = in;
219  } else {
220  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
221  if (!out) {
222  av_frame_free(&in);
223  return AVERROR(ENOMEM);
224  }
226  }
227 
228  if (s->eval_mode == EVAL_MODE_FRAME)
229  update_context(s, inlink, in);
230 
231  if (s->desc->flags & AV_PIX_FMT_FLAG_RGB) {
232  uint8_t *dst = out->data[0];
233  const uint8_t *src = in ->data[0];
234  const float *fmap = s->fmap;
235  const int dst_linesize = out->linesize[0];
236  const int src_linesize = in ->linesize[0];
237  const int fmap_linesize = s->fmap_linesize;
238 
239  for (y = 0; y < inlink->h; y++) {
240  uint8_t *dstp = dst;
241  const uint8_t *srcp = src;
242 
243  for (x = 0; x < inlink->w; x++, dstp += 3, srcp += 3) {
244  const float f = fmap[x];
245 
246  dstp[0] = av_clip_uint8(srcp[0] * f + get_dither_value(s));
247  dstp[1] = av_clip_uint8(srcp[1] * f + get_dither_value(s));
248  dstp[2] = av_clip_uint8(srcp[2] * f + get_dither_value(s));
249  }
250  dst += dst_linesize;
251  src += src_linesize;
252  fmap += fmap_linesize;
253  }
254  } else {
255  int plane;
256 
257  for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
258  uint8_t *dst = out->data[plane];
259  const uint8_t *src = in ->data[plane];
260  const float *fmap = s->fmap;
261  const int dst_linesize = out->linesize[plane];
262  const int src_linesize = in ->linesize[plane];
263  const int fmap_linesize = s->fmap_linesize;
264  const int chroma = plane == 1 || plane == 2;
265  const int hsub = chroma ? s->desc->log2_chroma_w : 0;
266  const int vsub = chroma ? s->desc->log2_chroma_h : 0;
267  const int w = AV_CEIL_RSHIFT(inlink->w, hsub);
268  const int h = AV_CEIL_RSHIFT(inlink->h, vsub);
269 
270  for (y = 0; y < h; y++) {
271  uint8_t *dstp = dst;
272  const uint8_t *srcp = src;
273 
274  for (x = 0; x < w; x++) {
275  const double dv = get_dither_value(s);
276  if (chroma) *dstp++ = av_clip_uint8(fmap[x << hsub] * (*srcp++ - 127) + 127 + dv);
277  else *dstp++ = av_clip_uint8(fmap[x ] * *srcp++ + dv);
278  }
279  dst += dst_linesize;
280  src += src_linesize;
281  fmap += fmap_linesize << vsub;
282  }
283  }
284  }
285 
286  if (!direct)
287  av_frame_free(&in);
288  return ff_filter_frame(outlink, out);
289 }
290 
292 {
293  VignetteContext *s = inlink->dst->priv;
294  AVRational sar = inlink->sample_aspect_ratio;
295 
296  s->desc = av_pix_fmt_desc_get(inlink->format);
297  s->var_values[VAR_W] = inlink->w;
298  s->var_values[VAR_H] = inlink->h;
299  s->var_values[VAR_TB] = av_q2d(inlink->time_base);
300  s->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ?
301  NAN : av_q2d(inlink->frame_rate);
302 
303  if (!sar.num || !sar.den)
304  sar.num = sar.den = 1;
305  if (sar.num > sar.den) {
306  s->xscale = av_q2d(av_div_q(sar, s->aspect));
307  s->yscale = 1;
308  } else {
309  s->yscale = av_q2d(av_div_q(s->aspect, sar));
310  s->xscale = 1;
311  }
312  s->dmax = hypot(inlink->w / 2., inlink->h / 2.);
313  av_log(s, AV_LOG_DEBUG, "xscale=%f yscale=%f dmax=%f\n",
314  s->xscale, s->yscale, s->dmax);
315 
316  s->fmap_linesize = FFALIGN(inlink->w, 32);
317  s->fmap = av_malloc_array(s->fmap_linesize, inlink->h * sizeof(*s->fmap));
318  if (!s->fmap)
319  return AVERROR(ENOMEM);
320 
321  if (s->eval_mode == EVAL_MODE_INIT)
323 
324  return 0;
325 }
326 
327 static const AVFilterPad vignette_inputs[] = {
328  {
329  .name = "default",
330  .type = AVMEDIA_TYPE_VIDEO,
331  .filter_frame = filter_frame,
332  .config_props = config_props,
333  },
334  { NULL }
335 };
336 
337 static const AVFilterPad vignette_outputs[] = {
338  {
339  .name = "default",
340  .type = AVMEDIA_TYPE_VIDEO,
341  },
342  { NULL }
343 };
344 
346  .name = "vignette",
347  .description = NULL_IF_CONFIG_SMALL("Make or reverse a vignette effect."),
348  .priv_size = sizeof(VignetteContext),
349  .init = init,
350  .uninit = uninit,
354  .priv_class = &vignette_class,
356 };
var_names
static const char *const var_names[]
Definition: vf_vignette.c:32
VignetteContext::fmap_linesize
int fmap_linesize
Definition: vf_vignette.c:71
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
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_vignette.c:120
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:49
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:82
VAR_NB
@ VAR_NB
Definition: vf_vignette.c:51
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
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:60
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:50
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
pixdesc.h
w
uint8_t w
Definition: llviddspenc.c:39
VignetteContext::var_values
double var_values[VAR_NB]
Definition: vf_vignette.c:69
VignetteContext::do_dither
int do_dither
Definition: vf_vignette.c:75
M_PI_2
#define M_PI_2
Definition: mathematics.h:55
AVOption
AVOption.
Definition: opt.h:248
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:1624
get_natural_factor
static double get_natural_factor(const VignetteContext *s, int x, int y)
Definition: vf_vignette.c:145
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:230
video.h
vignette_inputs
static const AVFilterPad vignette_inputs[]
Definition: vf_vignette.c:327
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:81
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
ff_vf_vignette
const AVFilter ff_vf_vignette
Definition: vf_vignette.c:345
init
static av_cold int init(AVFilterContext *ctx)
Definition: vf_vignette.c:100
VignetteContext::dmax
double dmax
Definition: vf_vignette.c:72
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:80
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:54
avassert.h
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:129
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:46
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:289
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:202
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:73
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:55
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
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:536
VignetteContext::yscale
float yscale
Definition: vf_vignette.c:73
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:45
VignetteContext::dither
uint32_t dither
Definition: vf_vignette.c:74
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:48
eval.h
AV_PIX_FMT_RGB24
@ AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
EVAL_MODE_FRAME
@ EVAL_MODE_FRAME
Definition: vf_vignette.c:56
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:137
config_props
static int config_props(AVFilterLink *inlink)
Definition: vf_vignette.c:291
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:472
VignetteContext::scale
AVRational scale
Definition: vf_vignette.c:77
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:57
VignetteContext::eval_mode
int eval_mode
EvalMode.
Definition: vf_vignette.c:64
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:208
VignetteContext::aspect
AVRational aspect
Definition: vf_vignette.c:76
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:62
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:44
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:225
avfilter.h
update_context
static void update_context(VignetteContext *s, AVFilterLink *inlink, AVFrame *frame)
Definition: vf_vignette.c:158
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:70
VignetteContext::backward
int backward
Definition: vf_vignette.c:63
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:70
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:48
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:242
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:47
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:198
h
h
Definition: vp9dsp_template.c:2038
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
vignette_outputs
static const AVFilterPad vignette_outputs[]
Definition: vf_vignette.c:337
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:234