FFmpeg
vf_fade.c
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1 /*
2  * Copyright (c) 2010 Brandon Mintern
3  * Copyright (c) 2007 Bobby Bingham
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * video fade filter
25  * based heavily on vf_negate.c by Bobby Bingham
26  */
27 
28 #include "libavutil/avassert.h"
29 #include "libavutil/avstring.h"
30 #include "libavutil/common.h"
31 #include "libavutil/eval.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/pixdesc.h"
34 #include "avfilter.h"
35 #include "drawutils.h"
36 #include "formats.h"
37 #include "internal.h"
38 #include "video.h"
39 
40 #define R 0
41 #define G 1
42 #define B 2
43 #define A 3
44 
45 #define Y 0
46 #define U 1
47 #define V 2
48 
49 #define FADE_IN 0
50 #define FADE_OUT 1
51 
52 typedef struct FadeContext {
53  const AVClass *class;
54  int type;
57  int hsub, vsub, bpp;
62  int alpha;
63  int is_planar;
64  uint64_t start_time, duration;
66  uint8_t color_rgba[4]; ///< fade color
67  int black_fade; ///< if color_rgba is black
68 } FadeContext;
69 
71 {
72  FadeContext *s = ctx->priv;
73 
74  s->fade_per_frame = (1 << 16) / s->nb_frames;
76 
77  if (s->duration != 0) {
78  // If duration (seconds) is non-zero, assume that we are not fading based on frames
79  s->nb_frames = 0; // Mostly to clean up logging
80  }
81 
82  // Choose what to log. If both time-based and frame-based options, both lines will be in the log
83  if (s->start_frame || s->nb_frames) {
85  "type:%s start_frame:%d nb_frames:%d alpha:%d\n",
86  s->type == FADE_IN ? "in" : "out", s->start_frame,
87  s->nb_frames,s->alpha);
88  }
89  if (s->start_time || s->duration) {
91  "type:%s start_time:%f duration:%f alpha:%d\n",
92  s->type == FADE_IN ? "in" : "out", (s->start_time / (double)AV_TIME_BASE),
93  (s->duration / (double)AV_TIME_BASE),s->alpha);
94  }
95 
96  s->black_fade = !memcmp(s->color_rgba, "\x00\x00\x00\xff", 4);
97  return 0;
98 }
99 
101 {
102  const FadeContext *s = ctx->priv;
103  static const enum AVPixelFormat pix_fmts[] = {
114  };
115  static const enum AVPixelFormat pix_fmts_rgb[] = {
120  AV_PIX_FMT_NONE
121  };
122  static const enum AVPixelFormat pix_fmts_alpha[] = {
127  AV_PIX_FMT_NONE
128  };
129  static const enum AVPixelFormat pix_fmts_rgba[] = {
133  AV_PIX_FMT_NONE
134  };
135  AVFilterFormats *fmts_list;
136 
137  if (s->alpha) {
138  if (s->black_fade)
139  fmts_list = ff_make_format_list(pix_fmts_alpha);
140  else
141  fmts_list = ff_make_format_list(pix_fmts_rgba);
142  } else {
143  if (s->black_fade)
144  fmts_list = ff_make_format_list(pix_fmts);
145  else
146  fmts_list = ff_make_format_list(pix_fmts_rgb);
147  }
148  if (!fmts_list)
149  return AVERROR(ENOMEM);
150  return ff_set_common_formats(ctx, fmts_list);
151 }
152 
153 const static enum AVPixelFormat studio_level_pix_fmts[] = {
158 };
159 
161 {
162  FadeContext *s = inlink->dst->priv;
163  const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format);
164 
165  s->hsub = pixdesc->log2_chroma_w;
166  s->vsub = pixdesc->log2_chroma_h;
167 
168  ff_fill_rgba_map(s->rgba_map, inlink->format);
169 
170  s->bpp = pixdesc->flags & AV_PIX_FMT_FLAG_PLANAR ?
171  1 :
172  av_get_bits_per_pixel(pixdesc) >> 3;
173  s->alpha &= !!(pixdesc->flags & AV_PIX_FMT_FLAG_ALPHA);
174  s->is_planar = pixdesc->flags & AV_PIX_FMT_FLAG_PLANAR;
175  s->is_rgb = pixdesc->flags & AV_PIX_FMT_FLAG_RGB;
176  s->is_packed_rgb = !s->is_planar && s->is_rgb;
177 
178  /* use CCIR601/709 black level for studio-level pixel non-alpha components */
179  s->black_level =
180  ff_fmt_is_in(inlink->format, studio_level_pix_fmts) && !s->alpha ? 16 : 0;
181  /* 32768 = 1 << 15, it is an integer representation
182  * of 0.5 and is for rounding. */
183  s->black_level_scaled = (s->black_level << 16) + 32768;
184  return 0;
185 }
186 
188  int slice_start, int slice_end,
189  int do_alpha, int step)
190 {
191  int i, j;
192  const uint8_t r_idx = s->rgba_map[R];
193  const uint8_t g_idx = s->rgba_map[G];
194  const uint8_t b_idx = s->rgba_map[B];
195  const uint8_t a_idx = s->rgba_map[A];
196  const uint8_t *c = s->color_rgba;
197 
198  for (i = slice_start; i < slice_end; i++) {
199  uint8_t *p = frame->data[0] + i * frame->linesize[0];
200  for (j = 0; j < frame->width; j++) {
201 #define INTERP(c_name, c_idx) av_clip_uint8(((c[c_idx]<<16) + ((int)p[c_name] - (int)c[c_idx]) * s->factor + (1<<15)) >> 16)
202  p[r_idx] = INTERP(r_idx, 0);
203  p[g_idx] = INTERP(g_idx, 1);
204  p[b_idx] = INTERP(b_idx, 2);
205  if (do_alpha)
206  p[a_idx] = INTERP(a_idx, 3);
207  p += step;
208  }
209  }
210 }
211 
213  int slice_start, int slice_end,
214  int do_alpha)
215 {
216  int i, j;
217  const uint8_t *c = s->color_rgba;
218 
219  for (i = slice_start; i < slice_end; i++) {
220  uint8_t *pg = frame->data[0] + i * frame->linesize[0];
221  uint8_t *pb = frame->data[1] + i * frame->linesize[1];
222  uint8_t *pr = frame->data[2] + i * frame->linesize[2];
223  uint8_t *pa = frame->data[3] + i * frame->linesize[3];
224  for (j = 0; j < frame->width; j++) {
225 #define INTERPP(c_name, c_idx) av_clip_uint8(((c[c_idx]<<16) + ((int)c_name - (int)c[c_idx]) * s->factor + (1<<15)) >> 16)
226  pr[j] = INTERPP(pr[j], 1);
227  pg[j] = INTERPP(pg[j], 0);
228  pb[j] = INTERPP(pb[j], 2);
229  if (do_alpha)
230  pa[j] = INTERPP(pa[j], 3);
231  }
232  }
233 }
234 
235 static int filter_slice_rgb(AVFilterContext *ctx, void *arg, int jobnr,
236  int nb_jobs)
237 {
238  FadeContext *s = ctx->priv;
239  AVFrame *frame = arg;
240  int slice_start = (frame->height * jobnr ) / nb_jobs;
241  int slice_end = (frame->height * (jobnr+1)) / nb_jobs;
242 
243  if (s->is_planar && s->alpha)
244  filter_rgb_planar(s, frame, slice_start, slice_end, 1);
245  else if (s->is_planar)
246  filter_rgb_planar(s, frame, slice_start, slice_end, 0);
247  else if (s->alpha) filter_rgb(s, frame, slice_start, slice_end, 1, 4);
248  else if (s->bpp == 3) filter_rgb(s, frame, slice_start, slice_end, 0, 3);
249  else if (s->bpp == 4) filter_rgb(s, frame, slice_start, slice_end, 0, 4);
250  else av_assert0(0);
251 
252  return 0;
253 }
254 
255 static int filter_slice_luma(AVFilterContext *ctx, void *arg, int jobnr,
256  int nb_jobs)
257 {
258  FadeContext *s = ctx->priv;
259  AVFrame *frame = arg;
260  int slice_start = (frame->height * jobnr ) / nb_jobs;
261  int slice_end = (frame->height * (jobnr+1)) / nb_jobs;
262  int i, j;
263 
264  for (int k = 0; k < 1 + 2 * (s->is_planar && s->is_rgb); k++) {
265  for (i = slice_start; i < slice_end; i++) {
266  uint8_t *p = frame->data[k] + i * frame->linesize[k];
267  for (j = 0; j < frame->width * s->bpp; j++) {
268  /* s->factor is using 16 lower-order bits for decimal
269  * places. 32768 = 1 << 15, it is an integer representation
270  * of 0.5 and is for rounding. */
271  *p = ((*p - s->black_level) * s->factor + s->black_level_scaled) >> 16;
272  p++;
273  }
274  }
275  }
276 
277  return 0;
278 }
279 
280 static int filter_slice_chroma(AVFilterContext *ctx, void *arg, int jobnr,
281  int nb_jobs)
282 {
283  FadeContext *s = ctx->priv;
284  AVFrame *frame = arg;
285  int i, j, plane;
286  const int width = AV_CEIL_RSHIFT(frame->width, s->hsub);
287  const int height= AV_CEIL_RSHIFT(frame->height, s->vsub);
288  int slice_start = (height * jobnr ) / nb_jobs;
289  int slice_end = FFMIN(((height * (jobnr+1)) / nb_jobs), frame->height);
290 
291  for (plane = 1; plane < 3; plane++) {
292  for (i = slice_start; i < slice_end; i++) {
293  uint8_t *p = frame->data[plane] + i * frame->linesize[plane];
294  for (j = 0; j < width; j++) {
295  /* 8421367 = ((128 << 1) + 1) << 15. It is an integer
296  * representation of 128.5. The .5 is for rounding
297  * purposes. */
298  *p = ((*p - 128) * s->factor + 8421367) >> 16;
299  p++;
300  }
301  }
302  }
303 
304  return 0;
305 }
306 
307 static int filter_slice_alpha(AVFilterContext *ctx, void *arg, int jobnr,
308  int nb_jobs)
309 {
310  FadeContext *s = ctx->priv;
311  AVFrame *frame = arg;
312  int plane = s->is_packed_rgb ? 0 : A;
313  int slice_start = (frame->height * jobnr ) / nb_jobs;
314  int slice_end = (frame->height * (jobnr+1)) / nb_jobs;
315  int i, j;
316 
317  for (i = slice_start; i < slice_end; i++) {
318  uint8_t *p = frame->data[plane] + i * frame->linesize[plane] + s->is_packed_rgb*s->rgba_map[A];
319  int step = s->is_packed_rgb ? 4 : 1;
320  for (j = 0; j < frame->width; j++) {
321  /* s->factor is using 16 lower-order bits for decimal
322  * places. 32768 = 1 << 15, it is an integer representation
323  * of 0.5 and is for rounding. */
324  *p = ((*p - s->black_level) * s->factor + s->black_level_scaled) >> 16;
325  p += step;
326  }
327  }
328 
329  return 0;
330 }
331 
333 {
334  AVFilterContext *ctx = inlink->dst;
335  FadeContext *s = ctx->priv;
336  double frame_timestamp = frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base);
337 
338  // Calculate Fade assuming this is a Fade In
339  if (s->fade_state == VF_FADE_WAITING) {
340  s->factor=0;
341  if (frame_timestamp >= s->start_time/(double)AV_TIME_BASE
342  && inlink->frame_count_out >= s->start_frame) {
343  // Time to start fading
345 
346  // Save start time in case we are starting based on frames and fading based on time
347  if (s->start_time == 0 && s->start_frame != 0) {
348  s->start_time = frame_timestamp*(double)AV_TIME_BASE;
349  }
350 
351  // Save start frame in case we are starting based on time and fading based on frames
352  if (s->start_time != 0 && s->start_frame == 0) {
353  s->start_frame = inlink->frame_count_out;
354  }
355  }
356  }
357  if (s->fade_state == VF_FADE_FADING) {
358  if (s->duration == 0) {
359  // Fading based on frame count
360  s->factor = (inlink->frame_count_out - s->start_frame) * s->fade_per_frame;
361  if (inlink->frame_count_out > s->start_frame + s->nb_frames) {
363  }
364 
365  } else {
366  // Fading based on duration
367  s->factor = (frame_timestamp - s->start_time/(double)AV_TIME_BASE)
368  * (float) UINT16_MAX / (s->duration/(double)AV_TIME_BASE);
369  if (frame_timestamp > s->start_time/(double)AV_TIME_BASE
370  + s->duration/(double)AV_TIME_BASE) {
372  }
373  }
374  }
375  if (s->fade_state == VF_FADE_DONE) {
376  s->factor=UINT16_MAX;
377  }
378 
379  s->factor = av_clip_uint16(s->factor);
380 
381  // Invert fade_factor if Fading Out
382  if (s->type == FADE_OUT) {
383  s->factor=UINT16_MAX-s->factor;
384  }
385 
386  if (s->factor < UINT16_MAX) {
387  if (s->alpha) {
388  ctx->internal->execute(ctx, filter_slice_alpha, frame, NULL,
389  FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
390  } else if (s->is_rgb && !s->black_fade) {
391  ctx->internal->execute(ctx, filter_slice_rgb, frame, NULL,
392  FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
393  } else {
394  /* luma, or rgb plane in case of black */
395  ctx->internal->execute(ctx, filter_slice_luma, frame, NULL,
396  FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
397 
398  if (frame->data[1] && frame->data[2] && !s->is_rgb) {
399  /* chroma planes */
400  ctx->internal->execute(ctx, filter_slice_chroma, frame, NULL,
401  FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
402  }
403  }
404  }
405 
406  return ff_filter_frame(inlink->dst->outputs[0], frame);
407 }
408 
409 
410 #define OFFSET(x) offsetof(FadeContext, x)
411 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
412 
413 static const AVOption fade_options[] = {
414  { "type", "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
415  { "t", "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
416  { "in", "fade-in", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_IN }, .unit = "type" },
417  { "out", "fade-out", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_OUT }, .unit = "type" },
418  { "start_frame", "Number of the first frame to which to apply the effect.",
419  OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
420  { "s", "Number of the first frame to which to apply the effect.",
421  OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
422  { "nb_frames", "Number of frames to which the effect should be applied.",
423  OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 25 }, 1, INT_MAX, FLAGS },
424  { "n", "Number of frames to which the effect should be applied.",
425  OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 25 }, 1, INT_MAX, FLAGS },
426  { "alpha", "fade alpha if it is available on the input", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, FLAGS },
427  { "start_time", "Number of seconds of the beginning of the effect.",
428  OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },
429  { "st", "Number of seconds of the beginning of the effect.",
430  OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },
431  { "duration", "Duration of the effect in seconds.",
432  OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },
433  { "d", "Duration of the effect in seconds.",
434  OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },
435  { "color", "set color", OFFSET(color_rgba), AV_OPT_TYPE_COLOR, {.str = "black"}, CHAR_MIN, CHAR_MAX, FLAGS },
436  { "c", "set color", OFFSET(color_rgba), AV_OPT_TYPE_COLOR, {.str = "black"}, CHAR_MIN, CHAR_MAX, FLAGS },
437  { NULL }
438 };
439 
441 
443  {
444  .name = "default",
445  .type = AVMEDIA_TYPE_VIDEO,
446  .config_props = config_props,
447  .filter_frame = filter_frame,
448  .needs_writable = 1,
449  },
450  { NULL }
451 };
452 
454  {
455  .name = "default",
456  .type = AVMEDIA_TYPE_VIDEO,
457  },
458  { NULL }
459 };
460 
462  .name = "fade",
463  .description = NULL_IF_CONFIG_SMALL("Fade in/out input video."),
464  .init = init,
465  .priv_size = sizeof(FadeContext),
466  .priv_class = &fade_class,
468  .inputs = avfilter_vf_fade_inputs,
469  .outputs = avfilter_vf_fade_outputs,
471 };
int plane
Definition: avisynth_c.h:384
#define NULL
Definition: coverity.c:32
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2522
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
static const AVFilterPad avfilter_vf_fade_outputs[]
Definition: vf_fade.c:453
AVOption.
Definition: opt.h:246
int bpp
Definition: vf_fade.c:57
uint8_t is_rgb
Definition: vf_fade.c:59
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
#define INTERPP(c_name, c_idx)
Main libavfilter public API header.
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
int av_get_bits_per_pixel(const AVPixFmtDescriptor *pixdesc)
Return the number of bits per pixel used by the pixel format described by pixdesc.
Definition: pixdesc.c:2474
planar GBR 4:4:4 24bpp
Definition: pixfmt.h:168
static int config_props(AVFilterLink *inlink)
Definition: vf_fade.c:160
unsigned int black_level
Definition: vf_fade.c:58
GLint GLenum type
Definition: opengl_enc.c:104
static const AVOption fade_options[]
Definition: vf_fade.c:413
enum FadeContext::@236 fade_state
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:92
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:283
const char * name
Pad name.
Definition: internal.h:60
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1075
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:101
uint64_t duration
Definition: vf_fade.c:64
uint8_t
#define av_cold
Definition: attributes.h:82
#define AV_PIX_FMT_FLAG_ALPHA
The pixel format has an alpha channel.
Definition: pixdesc.h:177
AVOptions.
#define FLAGS
Definition: vf_fade.c:411
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
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:388
#define INTERP(c_name, c_idx)
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:94
int black_fade
if color_rgba is black
Definition: vf_fade.c:67
#define height
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
planar YUV 4:4:0 full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV440P and setting color_range...
Definition: pixfmt.h:100
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting col...
Definition: pixfmt.h:79
int alpha
Definition: vf_fade.c:62
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:192
int ff_fmt_is_in(int fmt, const int *fmts)
Tell if an integer is contained in the provided -1-terminated list of integers.
Definition: formats.c:254
#define av_log(a,...)
static av_always_inline void filter_rgb(FadeContext *s, const AVFrame *frame, int slice_start, int slice_end, int do_alpha, int step)
Definition: vf_fade.c:187
A filter pad used for either input or output.
Definition: internal.h:54
static int query_formats(AVFilterContext *ctx)
Definition: vf_fade.c:100
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
Definition: pixfmt.h:176
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
int width
Definition: frame.h:353
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:569
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:101
#define AV_PIX_FMT_FLAG_RGB
The pixel format contains RGB-like data (as opposed to YUV/grayscale).
Definition: pixdesc.h:148
static void fade(uint8_t *dst, ptrdiff_t dst_linesize, const uint8_t *src, ptrdiff_t src_linesize, int width, int height, int alpha, int beta)
Definition: vp8.c:488
static av_cold int init(AVFilterContext *ctx)
Definition: vf_fade.c:70
uint8_t is_packed_rgb
Definition: vf_fade.c:60
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:95
void * priv
private data for use by the filter
Definition: avfilter.h:353
uint64_t start_time
Definition: vf_fade.c:64
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
Definition: avfilter.h:116
const char * arg
Definition: jacosubdec.c:66
simple assert() macros that are a bit more flexible than ISO C assert().
#define A
Definition: vf_fade.c:43
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
Definition: vf_fade.c:332
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:92
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:93
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:70
uint64_t flags
Combination of AV_PIX_FMT_FLAG_...
Definition: pixdesc.h:106
int fade_per_frame
Definition: vf_fade.c:55
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:784
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
static int filter_slice_rgb(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_fade.c:235
#define FFMIN(a, b)
Definition: common.h:96
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
Definition: pixfmt.h:78
#define width
AVFormatContext * ctx
Definition: movenc.c:48
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
#define s(width, name)
Definition: cbs_vp9.c:257
static int filter_slice_chroma(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_fade.c:280
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
static const AVFilterPad avfilter_vf_fade_inputs[]
Definition: vf_fade.c:442
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt)
Definition: drawutils.c:35
if(ret)
#define FADE_OUT
Definition: vf_fade.c:50
AVFilter ff_vf_fade
Definition: vf_fade.c:461
misc drawing utilities
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
Definition: pixfmt.h:177
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
int start_frame
Definition: vf_fade.c:56
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
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:72
Describe the class of an AVClass context structure.
Definition: log.h:67
static int filter_slice_luma(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_fade.c:255
int vsub
Definition: vf_fade.c:57
Filter definition.
Definition: avfilter.h:144
const char * name
Filter name.
Definition: avfilter.h:148
int type
Definition: vf_fade.c:54
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
#define FADE_IN
Definition: vf_fade.c:49
#define flags(name, subs,...)
Definition: cbs_av1.c:564
AVFilterInternal * internal
An opaque struct for libavfilter internal use.
Definition: avfilter.h:378
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
uint8_t color_rgba[4]
fade color
Definition: vf_fade.c:66
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
common internal and external API header
planar GBRA 4:4:4:4 32bpp
Definition: pixfmt.h:215
int nb_frames
Definition: vf_fade.c:56
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting col...
Definition: pixfmt.h:80
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:73
#define OFFSET(x)
Definition: vf_fade.c:410
avfilter_execute_func * execute
Definition: internal.h:144
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:2035
static av_always_inline void filter_rgb_planar(FadeContext *s, const AVFrame *frame, int slice_start, int slice_end, int do_alpha)
Definition: vf_fade.c:212
int factor
Definition: vf_fade.c:55
unsigned int black_level_scaled
Definition: vf_fade.c:58
int hsub
Definition: vf_fade.c:57
A list of supported formats for one end of a filter link.
Definition: formats.h:64
static int filter_slice_alpha(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_fade.c:307
An instance of a filter.
Definition: avfilter.h:338
uint8_t rgba_map[4]
Definition: vf_fade.c:61
int height
Definition: frame.h:353
#define G
Definition: vf_fade.c:41
int is_planar
Definition: vf_fade.c:63
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
Definition: pixfmt.h:99
#define av_always_inline
Definition: attributes.h:39
#define R
Definition: vf_fade.c:40
internal API functions
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
#define B
Definition: vf_fade.c:42
static const enum AVPixelFormat studio_level_pix_fmts[]
Definition: vf_fade.c:153
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
#define AV_PIX_FMT_FLAG_PLANAR
At least one pixel component is not in the first data plane.
Definition: pixdesc.h:144
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But a word about which is also called distortion Distortion can be quantified by almost any quality measurement one chooses the sum of squared differences is used but more complex methods that consider psychovisual effects can be used as well It makes no difference in this discussion First step
simple arithmetic expression evaluator
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:58
AVFILTER_DEFINE_CLASS(fade)