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;
61  int alpha;
62  uint64_t start_time, duration;
64  uint8_t color_rgba[4]; ///< fade color
65  int black_fade; ///< if color_rgba is black
66 } FadeContext;
67 
69 {
70  FadeContext *s = ctx->priv;
71 
72  s->fade_per_frame = (1 << 16) / s->nb_frames;
74 
75  if (s->duration != 0) {
76  // If duration (seconds) is non-zero, assume that we are not fading based on frames
77  s->nb_frames = 0; // Mostly to clean up logging
78  }
79 
80  // Choose what to log. If both time-based and frame-based options, both lines will be in the log
81  if (s->start_frame || s->nb_frames) {
83  "type:%s start_frame:%d nb_frames:%d alpha:%d\n",
84  s->type == FADE_IN ? "in" : "out", s->start_frame,
85  s->nb_frames,s->alpha);
86  }
87  if (s->start_time || s->duration) {
89  "type:%s start_time:%f duration:%f alpha:%d\n",
90  s->type == FADE_IN ? "in" : "out", (s->start_time / (double)AV_TIME_BASE),
91  (s->duration / (double)AV_TIME_BASE),s->alpha);
92  }
93 
94  s->black_fade = !memcmp(s->color_rgba, "\x00\x00\x00\xff", 4);
95  return 0;
96 }
97 
99 {
100  const FadeContext *s = ctx->priv;
101  static const enum AVPixelFormat pix_fmts[] = {
111  };
112  static const enum AVPixelFormat pix_fmts_rgb[] = {
116  AV_PIX_FMT_NONE
117  };
118  static const enum AVPixelFormat pix_fmts_alpha[] = {
122  AV_PIX_FMT_NONE
123  };
124  static const enum AVPixelFormat pix_fmts_rgba[] = {
127  AV_PIX_FMT_NONE
128  };
129  AVFilterFormats *fmts_list;
130 
131  if (s->alpha) {
132  if (s->black_fade)
133  fmts_list = ff_make_format_list(pix_fmts_alpha);
134  else
135  fmts_list = ff_make_format_list(pix_fmts_rgba);
136  } else {
137  if (s->black_fade)
138  fmts_list = ff_make_format_list(pix_fmts);
139  else
140  fmts_list = ff_make_format_list(pix_fmts_rgb);
141  }
142  if (!fmts_list)
143  return AVERROR(ENOMEM);
144  return ff_set_common_formats(ctx, fmts_list);
145 }
146 
147 const static enum AVPixelFormat studio_level_pix_fmts[] = {
152 };
153 
155 {
156  FadeContext *s = inlink->dst->priv;
157  const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format);
158 
159  s->hsub = pixdesc->log2_chroma_w;
160  s->vsub = pixdesc->log2_chroma_h;
161 
162  s->bpp = pixdesc->flags & AV_PIX_FMT_FLAG_PLANAR ?
163  1 :
164  av_get_bits_per_pixel(pixdesc) >> 3;
165  s->alpha &= !!(pixdesc->flags & AV_PIX_FMT_FLAG_ALPHA);
166  s->is_packed_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;
167 
168  /* use CCIR601/709 black level for studio-level pixel non-alpha components */
169  s->black_level =
170  ff_fmt_is_in(inlink->format, studio_level_pix_fmts) && !s->alpha ? 16 : 0;
171  /* 32768 = 1 << 15, it is an integer representation
172  * of 0.5 and is for rounding. */
173  s->black_level_scaled = (s->black_level << 16) + 32768;
174  return 0;
175 }
176 
178  int slice_start, int slice_end,
179  int do_alpha, int step)
180 {
181  int i, j;
182  const uint8_t r_idx = s->rgba_map[R];
183  const uint8_t g_idx = s->rgba_map[G];
184  const uint8_t b_idx = s->rgba_map[B];
185  const uint8_t a_idx = s->rgba_map[A];
186  const uint8_t *c = s->color_rgba;
187 
188  for (i = slice_start; i < slice_end; i++) {
189  uint8_t *p = frame->data[0] + i * frame->linesize[0];
190  for (j = 0; j < frame->width; j++) {
191 #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)
192  p[r_idx] = INTERP(r_idx, 0);
193  p[g_idx] = INTERP(g_idx, 1);
194  p[b_idx] = INTERP(b_idx, 2);
195  if (do_alpha)
196  p[a_idx] = INTERP(a_idx, 3);
197  p += step;
198  }
199  }
200 }
201 
202 static int filter_slice_rgb(AVFilterContext *ctx, void *arg, int jobnr,
203  int nb_jobs)
204 {
205  FadeContext *s = ctx->priv;
206  AVFrame *frame = arg;
207  int slice_start = (frame->height * jobnr ) / nb_jobs;
208  int slice_end = (frame->height * (jobnr+1)) / nb_jobs;
209 
210  if (s->alpha) filter_rgb(s, frame, slice_start, slice_end, 1, 4);
211  else if (s->bpp == 3) filter_rgb(s, frame, slice_start, slice_end, 0, 3);
212  else if (s->bpp == 4) filter_rgb(s, frame, slice_start, slice_end, 0, 4);
213  else av_assert0(0);
214 
215  return 0;
216 }
217 
218 static int filter_slice_luma(AVFilterContext *ctx, void *arg, int jobnr,
219  int nb_jobs)
220 {
221  FadeContext *s = ctx->priv;
222  AVFrame *frame = arg;
223  int slice_start = (frame->height * jobnr ) / nb_jobs;
224  int slice_end = (frame->height * (jobnr+1)) / nb_jobs;
225  int i, j;
226 
227  for (i = slice_start; i < slice_end; i++) {
228  uint8_t *p = frame->data[0] + i * frame->linesize[0];
229  for (j = 0; j < frame->width * s->bpp; j++) {
230  /* s->factor is using 16 lower-order bits for decimal
231  * places. 32768 = 1 << 15, it is an integer representation
232  * of 0.5 and is for rounding. */
233  *p = ((*p - s->black_level) * s->factor + s->black_level_scaled) >> 16;
234  p++;
235  }
236  }
237 
238  return 0;
239 }
240 
241 static int filter_slice_chroma(AVFilterContext *ctx, void *arg, int jobnr,
242  int nb_jobs)
243 {
244  FadeContext *s = ctx->priv;
245  AVFrame *frame = arg;
246  int i, j, plane;
247  const int width = AV_CEIL_RSHIFT(frame->width, s->hsub);
248  const int height= AV_CEIL_RSHIFT(frame->height, s->vsub);
249  int slice_start = (height * jobnr ) / nb_jobs;
250  int slice_end = FFMIN(((height * (jobnr+1)) / nb_jobs), frame->height);
251 
252  for (plane = 1; plane < 3; plane++) {
253  for (i = slice_start; i < slice_end; i++) {
254  uint8_t *p = frame->data[plane] + i * frame->linesize[plane];
255  for (j = 0; j < width; j++) {
256  /* 8421367 = ((128 << 1) + 1) << 15. It is an integer
257  * representation of 128.5. The .5 is for rounding
258  * purposes. */
259  *p = ((*p - 128) * s->factor + 8421367) >> 16;
260  p++;
261  }
262  }
263  }
264 
265  return 0;
266 }
267 
268 static int filter_slice_alpha(AVFilterContext *ctx, void *arg, int jobnr,
269  int nb_jobs)
270 {
271  FadeContext *s = ctx->priv;
272  AVFrame *frame = arg;
273  int plane = s->is_packed_rgb ? 0 : A;
274  int slice_start = (frame->height * jobnr ) / nb_jobs;
275  int slice_end = (frame->height * (jobnr+1)) / nb_jobs;
276  int i, j;
277 
278  for (i = slice_start; i < slice_end; i++) {
279  uint8_t *p = frame->data[plane] + i * frame->linesize[plane] + s->is_packed_rgb*s->rgba_map[A];
280  int step = s->is_packed_rgb ? 4 : 1;
281  for (j = 0; j < frame->width; j++) {
282  /* s->factor is using 16 lower-order bits for decimal
283  * places. 32768 = 1 << 15, it is an integer representation
284  * of 0.5 and is for rounding. */
285  *p = ((*p - s->black_level) * s->factor + s->black_level_scaled) >> 16;
286  p += step;
287  }
288  }
289 
290  return 0;
291 }
292 
294 {
295  AVFilterContext *ctx = inlink->dst;
296  FadeContext *s = ctx->priv;
297  double frame_timestamp = frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base);
298 
299  // Calculate Fade assuming this is a Fade In
300  if (s->fade_state == VF_FADE_WAITING) {
301  s->factor=0;
302  if (frame_timestamp >= s->start_time/(double)AV_TIME_BASE
303  && inlink->frame_count_out >= s->start_frame) {
304  // Time to start fading
306 
307  // Save start time in case we are starting based on frames and fading based on time
308  if (s->start_time == 0 && s->start_frame != 0) {
309  s->start_time = frame_timestamp*(double)AV_TIME_BASE;
310  }
311 
312  // Save start frame in case we are starting based on time and fading based on frames
313  if (s->start_time != 0 && s->start_frame == 0) {
314  s->start_frame = inlink->frame_count_out;
315  }
316  }
317  }
318  if (s->fade_state == VF_FADE_FADING) {
319  if (s->duration == 0) {
320  // Fading based on frame count
321  s->factor = (inlink->frame_count_out - s->start_frame) * s->fade_per_frame;
322  if (inlink->frame_count_out > s->start_frame + s->nb_frames) {
324  }
325 
326  } else {
327  // Fading based on duration
328  s->factor = (frame_timestamp - s->start_time/(double)AV_TIME_BASE)
329  * (float) UINT16_MAX / (s->duration/(double)AV_TIME_BASE);
330  if (frame_timestamp > s->start_time/(double)AV_TIME_BASE
331  + s->duration/(double)AV_TIME_BASE) {
333  }
334  }
335  }
336  if (s->fade_state == VF_FADE_DONE) {
337  s->factor=UINT16_MAX;
338  }
339 
340  s->factor = av_clip_uint16(s->factor);
341 
342  // Invert fade_factor if Fading Out
343  if (s->type == FADE_OUT) {
344  s->factor=UINT16_MAX-s->factor;
345  }
346 
347  if (s->factor < UINT16_MAX) {
348  if (s->alpha) {
349  ctx->internal->execute(ctx, filter_slice_alpha, frame, NULL,
350  FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
351  } else if (s->is_packed_rgb && !s->black_fade) {
352  ctx->internal->execute(ctx, filter_slice_rgb, frame, NULL,
353  FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
354  } else {
355  /* luma, or rgb plane in case of black */
356  ctx->internal->execute(ctx, filter_slice_luma, frame, NULL,
357  FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
358 
359  if (frame->data[1] && frame->data[2]) {
360  /* chroma planes */
361  ctx->internal->execute(ctx, filter_slice_chroma, frame, NULL,
362  FFMIN(frame->height, ff_filter_get_nb_threads(ctx)));
363  }
364  }
365  }
366 
367  return ff_filter_frame(inlink->dst->outputs[0], frame);
368 }
369 
370 
371 #define OFFSET(x) offsetof(FadeContext, x)
372 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
373 
374 static const AVOption fade_options[] = {
375  { "type", "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
376  { "t", "'in' or 'out' for fade-in/fade-out", OFFSET(type), AV_OPT_TYPE_INT, { .i64 = FADE_IN }, FADE_IN, FADE_OUT, FLAGS, "type" },
377  { "in", "fade-in", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_IN }, .unit = "type" },
378  { "out", "fade-out", 0, AV_OPT_TYPE_CONST, { .i64 = FADE_OUT }, .unit = "type" },
379  { "start_frame", "Number of the first frame to which to apply the effect.",
380  OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
381  { "s", "Number of the first frame to which to apply the effect.",
382  OFFSET(start_frame), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
383  { "nb_frames", "Number of frames to which the effect should be applied.",
384  OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 25 }, 1, INT_MAX, FLAGS },
385  { "n", "Number of frames to which the effect should be applied.",
386  OFFSET(nb_frames), AV_OPT_TYPE_INT, { .i64 = 25 }, 1, INT_MAX, FLAGS },
387  { "alpha", "fade alpha if it is available on the input", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, FLAGS },
388  { "start_time", "Number of seconds of the beginning of the effect.",
389  OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },
390  { "st", "Number of seconds of the beginning of the effect.",
391  OFFSET(start_time), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },
392  { "duration", "Duration of the effect in seconds.",
393  OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },
394  { "d", "Duration of the effect in seconds.",
395  OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64 = 0. }, 0, INT64_MAX, FLAGS },
396  { "color", "set color", OFFSET(color_rgba), AV_OPT_TYPE_COLOR, {.str = "black"}, CHAR_MIN, CHAR_MAX, FLAGS },
397  { "c", "set color", OFFSET(color_rgba), AV_OPT_TYPE_COLOR, {.str = "black"}, CHAR_MIN, CHAR_MAX, FLAGS },
398  { NULL }
399 };
400 
402 
404  {
405  .name = "default",
406  .type = AVMEDIA_TYPE_VIDEO,
407  .config_props = config_props,
408  .filter_frame = filter_frame,
409  .needs_writable = 1,
410  },
411  { NULL }
412 };
413 
415  {
416  .name = "default",
417  .type = AVMEDIA_TYPE_VIDEO,
418  },
419  { NULL }
420 };
421 
423  .name = "fade",
424  .description = NULL_IF_CONFIG_SMALL("Fade in/out input video."),
425  .init = init,
426  .priv_size = sizeof(FadeContext),
427  .priv_class = &fade_class,
429  .inputs = avfilter_vf_fade_inputs,
430  .outputs = avfilter_vf_fade_outputs,
432 };
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:414
AVOption.
Definition: opt.h:246
int bpp
Definition: vf_fade.c:57
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:71
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
static int config_props(AVFilterLink *inlink)
Definition: vf_fade.c:154
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:374
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:1093
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:62
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:372
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:65
#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:61
#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:177
A filter pad used for either input or output.
Definition: internal.h:54
static int query_formats(AVFilterContext *ctx)
Definition: vf_fade.c:98
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
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:68
uint8_t is_packed_rgb
Definition: vf_fade.c:59
#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:62
#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:293
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:802
#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:202
#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:241
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
static const AVFilterPad avfilter_vf_fade_inputs[]
Definition: vf_fade.c:403
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:422
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:218
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:561
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
enum FadeContext::@237 fade_state
uint8_t color_rgba[4]
fade color
Definition: vf_fade.c:64
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
common internal and external API header
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:371
avfilter_execute_func * execute
Definition: internal.h:155
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
Handle slice ends.
Definition: mpeg12dec.c:2036
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:268
An instance of a filter.
Definition: avfilter.h:338
uint8_t rgba_map[4]
Definition: vf_fade.c:60
int height
Definition: frame.h:353
#define G
Definition: vf_fade.c:41
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:147
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)