FFmpeg
vf_blackdetect.c
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1 /*
2  * Copyright (c) 2012 Stefano Sabatini
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * Video black detector, loosely based on blackframe with extended
24  * syntax and features
25  */
26 
27 #include <float.h>
28 #include "libavutil/opt.h"
29 #include "libavutil/pixdesc.h"
30 #include "libavutil/timestamp.h"
31 #include "avfilter.h"
32 #include "internal.h"
33 
34 typedef struct BlackDetectContext {
35  const AVClass *class;
36  double black_min_duration_time; ///< minimum duration of detected black, in seconds
37  int64_t black_min_duration; ///< minimum duration of detected black, expressed in timebase units
38  int64_t black_start; ///< pts start time of the first black picture
39  int64_t black_end; ///< pts end time of the last black picture
40  int64_t last_picref_pts; ///< pts of the last input picture
42 
45  unsigned int pixel_black_th_i;
46 
47  unsigned int nb_black_pixels; ///< number of black pixels counted so far
49  int depth;
51  unsigned int *counter;
53 
54 #define OFFSET(x) offsetof(BlackDetectContext, x)
55 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
56 
57 static const AVOption blackdetect_options[] = {
58  { "d", "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX, FLAGS },
59  { "black_min_duration", "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX, FLAGS },
60  { "picture_black_ratio_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
61  { "pic_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
62  { "pixel_black_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
63  { "pix_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
64  { NULL }
65 };
66 
67 AVFILTER_DEFINE_CLASS(blackdetect);
68 
69 #define YUVJ_FORMATS \
70  AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P
71 
72 static const enum AVPixelFormat yuvj_formats[] = {
74 };
75 
77 {
78  static const enum AVPixelFormat pix_fmts[] = {
99  };
100 
102  if (!fmts_list)
103  return AVERROR(ENOMEM);
104  return ff_set_common_formats(ctx, fmts_list);
105 }
106 
108 {
109  AVFilterContext *ctx = inlink->dst;
110  BlackDetectContext *s = ctx->priv;
112  const int depth = desc->comp[0].depth;
113  const int max = (1 << depth) - 1;
114  const int factor = (1 << (depth - 8));
115 
116  s->depth = depth;
117  s->nb_threads = ff_filter_get_nb_threads(ctx);
118  s->time_base = inlink->time_base;
119  s->black_min_duration = s->black_min_duration_time / av_q2d(s->time_base);
120  s->counter = av_calloc(s->nb_threads, sizeof(*s->counter));
121  if (!s->counter)
122  return AVERROR(ENOMEM);
123 
124  s->pixel_black_th_i = ff_fmt_is_in(inlink->format, yuvj_formats) ?
125  // luminance_minimum_value + pixel_black_th * luminance_range_size
126  s->pixel_black_th * max :
127  16 * factor + s->pixel_black_th * (235 - 16) * factor;
128 
130  "black_min_duration:%s pixel_black_th:%f pixel_black_th_i:%d picture_black_ratio_th:%f\n",
131  av_ts2timestr(s->black_min_duration, &s->time_base),
132  s->pixel_black_th, s->pixel_black_th_i,
133  s->picture_black_ratio_th);
134  return 0;
135 }
136 
138 {
139  BlackDetectContext *s = ctx->priv;
140 
141  if ((s->black_end - s->black_start) >= s->black_min_duration) {
143  "black_start:%s black_end:%s black_duration:%s\n",
144  av_ts2timestr(s->black_start, &s->time_base),
145  av_ts2timestr(s->black_end, &s->time_base),
146  av_ts2timestr(s->black_end - s->black_start, &s->time_base));
147  }
148 }
149 
151  int jobnr, int nb_jobs)
152 {
153  BlackDetectContext *s = ctx->priv;
154  const unsigned int threshold = s->pixel_black_th_i;
155  unsigned int *counterp = &s->counter[jobnr];
156  AVFrame *in = arg;
157  const int linesize = in->linesize[0];
158  const int w = in->width;
159  const int h = in->height;
160  const int start = (h * jobnr) / nb_jobs;
161  const int end = (h * (jobnr+1)) / nb_jobs;
162  const int size = end - start;
163  unsigned int counter = 0;
164 
165  if (s->depth == 8) {
166  const uint8_t *p = in->data[0] + start * linesize;
167 
168  for (int i = 0; i < size; i++) {
169  for (int x = 0; x < w; x++)
170  counter += p[x] <= threshold;
171  p += linesize;
172  }
173  } else {
174  const uint16_t *p = (const uint16_t *)(in->data[0] + start * linesize);
175 
176  for (int i = 0; i < size; i++) {
177  for (int x = 0; x < w; x++)
178  counter += p[x] <= threshold;
179  p += linesize / 2;
180  }
181  }
182 
183  *counterp = counter;
184 
185  return 0;
186 }
187 
189 {
190  AVFilterContext *ctx = inlink->dst;
191  BlackDetectContext *s = ctx->priv;
192  double picture_black_ratio = 0;
193 
194  ctx->internal->execute(ctx, black_counter, picref, NULL,
195  FFMIN(inlink->h, s->nb_threads));
196 
197  for (int i = 0; i < s->nb_threads; i++)
198  s->nb_black_pixels += s->counter[i];
199 
200  picture_black_ratio = (double)s->nb_black_pixels / (inlink->w * inlink->h);
201 
203  "frame:%"PRId64" picture_black_ratio:%f pts:%s t:%s type:%c\n",
204  inlink->frame_count_out, picture_black_ratio,
205  av_ts2str(picref->pts), av_ts2timestr(picref->pts, &s->time_base),
207 
208  if (picture_black_ratio >= s->picture_black_ratio_th) {
209  if (!s->black_started) {
210  /* black starts here */
211  s->black_started = 1;
212  s->black_start = picref->pts;
213  av_dict_set(&picref->metadata, "lavfi.black_start",
214  av_ts2timestr(s->black_start, &s->time_base), 0);
215  }
216  } else if (s->black_started) {
217  /* black ends here */
218  s->black_started = 0;
219  s->black_end = picref->pts;
221  av_dict_set(&picref->metadata, "lavfi.black_end",
222  av_ts2timestr(s->black_end, &s->time_base), 0);
223  }
224 
225  s->last_picref_pts = picref->pts;
226  s->nb_black_pixels = 0;
227  return ff_filter_frame(inlink->dst->outputs[0], picref);
228 }
229 
231 {
232  BlackDetectContext *s = ctx->priv;
233 
234  av_freep(&s->counter);
235 
236  if (s->black_started) {
237  // FIXME: black_end should be set to last_picref_pts + last_picref_duration
238  s->black_end = s->last_picref_pts;
240  }
241 }
242 
243 static const AVFilterPad blackdetect_inputs[] = {
244  {
245  .name = "default",
246  .type = AVMEDIA_TYPE_VIDEO,
247  .config_props = config_input,
248  .filter_frame = filter_frame,
249  },
250  { NULL }
251 };
252 
254  {
255  .name = "default",
256  .type = AVMEDIA_TYPE_VIDEO,
257  },
258  { NULL }
259 };
260 
262  .name = "blackdetect",
263  .description = NULL_IF_CONFIG_SMALL("Detect video intervals that are (almost) black."),
264  .priv_size = sizeof(BlackDetectContext),
268  .uninit = uninit,
269  .priv_class = &blackdetect_class,
271 };
AV_PIX_FMT_YUVA422P16
#define AV_PIX_FMT_YUVA422P16
Definition: pixfmt.h:432
BlackDetectContext::time_base
AVRational time_base
Definition: vf_blackdetect.c:48
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
ff_make_format_list
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:286
blackdetect_options
static const AVOption blackdetect_options[]
Definition: vf_blackdetect.c:57
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
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
BlackDetectContext::black_end
int64_t black_end
pts end time of the last black picture
Definition: vf_blackdetect.c:39
BlackDetectContext::black_min_duration_time
double black_min_duration_time
minimum duration of detected black, in seconds
Definition: vf_blackdetect.c:36
AV_PIX_FMT_YUVA422P9
#define AV_PIX_FMT_YUVA422P9
Definition: pixfmt.h:424
BlackDetectContext::last_picref_pts
int64_t last_picref_pts
pts of the last input picture
Definition: vf_blackdetect.c:40
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
pixdesc.h
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:396
AVFrame::width
int width
Definition: frame.h:361
AV_PIX_FMT_YUVA420P16
#define AV_PIX_FMT_YUVA420P16
Definition: pixfmt.h:431
w
uint8_t w
Definition: llviddspenc.c:39
AV_PIX_FMT_YUVA420P10
#define AV_PIX_FMT_YUVA420P10
Definition: pixfmt.h:426
AVOption
AVOption.
Definition: opt.h:248
AV_PIX_FMT_YUV420P10
#define AV_PIX_FMT_YUV420P10
Definition: pixfmt.h:389
black_counter
static int black_counter(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
Definition: vf_blackdetect.c:150
AV_LOG_VERBOSE
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:197
float.h
YUVJ_FORMATS
#define YUVJ_FORMATS
Definition: vf_blackdetect.c: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
max
#define max(a, b)
Definition: cuda_runtime.h:33
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:149
AVFormatContext::internal
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1554
AV_PIX_FMT_YUVA422P10
#define AV_PIX_FMT_YUVA422P10
Definition: pixfmt.h:427
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
AVFilterFormats
A list of supported formats for one end of a filter link.
Definition: formats.h:65
AV_PIX_FMT_YUVA420P9
#define AV_PIX_FMT_YUVA420P9
Definition: pixfmt.h:423
BlackDetectContext::depth
int depth
Definition: vf_blackdetect.c:49
AV_PIX_FMT_YUVA444P16
#define AV_PIX_FMT_YUVA444P16
Definition: pixfmt.h:433
AV_PIX_FMT_YUV422P9
#define AV_PIX_FMT_YUV422P9
Definition: pixfmt.h:387
AV_PIX_FMT_GRAY16
#define AV_PIX_FMT_GRAY16
Definition: pixfmt.h:373
AVFilterPad
A filter pad used for either input or output.
Definition: internal.h:54
AV_PIX_FMT_YUV444P10
#define AV_PIX_FMT_YUV444P10
Definition: pixfmt.h:392
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
AV_PIX_FMT_YUV422P16
#define AV_PIX_FMT_YUV422P16
Definition: pixfmt.h:401
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
ff_vf_blackdetect
const AVFilter ff_vf_blackdetect
Definition: vf_blackdetect.c:261
blackdetect_inputs
static const AVFilterPad blackdetect_inputs[]
Definition: vf_blackdetect.c:243
s
#define s(width, name)
Definition: cbs_vp9.c:257
AV_PIX_FMT_YUVA420P
@ AV_PIX_FMT_YUVA420P
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:101
AV_PIX_FMT_YUV444P16
#define AV_PIX_FMT_YUV444P16
Definition: pixfmt.h:402
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_blackdetect.c:230
AV_OPT_TYPE_DOUBLE
@ AV_OPT_TYPE_DOUBLE
Definition: opt.h:227
av_q2d
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
config_input
static int config_input(AVFilterLink *inlink)
Definition: vf_blackdetect.c:107
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:289
AV_PIX_FMT_YUVA444P12
#define AV_PIX_FMT_YUVA444P12
Definition: pixfmt.h:430
AV_PIX_FMT_YUV420P9
#define AV_PIX_FMT_YUV420P9
Definition: pixfmt.h:386
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:202
AV_PIX_FMT_YUV420P16
#define AV_PIX_FMT_YUV420P16
Definition: pixfmt.h:400
ctx
AVFormatContext * ctx
Definition: movenc.c:48
AV_PIX_FMT_GRAY14
#define AV_PIX_FMT_GRAY14
Definition: pixfmt.h:372
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
BlackDetectContext::pixel_black_th
double pixel_black_th
Definition: vf_blackdetect.c:44
arg
const char * arg
Definition: jacosubdec.c:67
AV_PIX_FMT_GRAY10
#define AV_PIX_FMT_GRAY10
Definition: pixfmt.h:370
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
NULL
#define NULL
Definition: coverity.c:32
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AV_PIX_FMT_YUV440P10
#define AV_PIX_FMT_YUV440P10
Definition: pixfmt.h:391
ff_fmt_is_in
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:257
AV_PIX_FMT_YUV422P10
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:390
AV_PIX_FMT_GRAY8
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
yuvj_formats
static enum AVPixelFormat yuvj_formats[]
Definition: vf_blackdetect.c:72
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:386
av_ts2timestr
#define av_ts2timestr(ts, tb)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: timestamp.h:76
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
BlackDetectContext::counter
unsigned int * counter
Definition: vf_blackdetect.c:51
AV_PIX_FMT_YUV422P12
#define AV_PIX_FMT_YUV422P12
Definition: pixfmt.h:394
size
int size
Definition: twinvq_data.h:10344
BlackDetectContext::black_started
int black_started
Definition: vf_blackdetect.c:41
AV_PIX_FMT_YUV444P12
#define AV_PIX_FMT_YUV444P12
Definition: pixfmt.h:396
BlackDetectContext::black_start
int64_t black_start
pts start time of the first black picture
Definition: vf_blackdetect.c:38
FFMIN
#define FFMIN(a, b)
Definition: common.h:105
AV_PIX_FMT_YUVA444P
@ AV_PIX_FMT_YUVA444P
planar YUV 4:4:4 32bpp, (1 Cr & Cb sample per 1x1 Y & A samples)
Definition: pixfmt.h:167
AV_PIX_FMT_YUVA444P10
#define AV_PIX_FMT_YUVA444P10
Definition: pixfmt.h:428
FLAGS
#define FLAGS
Definition: vf_blackdetect.c:55
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:192
internal.h
av_get_picture_type_char
char av_get_picture_type_char(enum AVPictureType pict_type)
Return a single letter to describe the given picture type pict_type.
Definition: utils.c:88
i
int i
Definition: input.c:407
ff_filter_get_nb_threads
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
Definition: avfilter.c:762
BlackDetectContext
Definition: vf_blackdetect.c:34
check_black_end
static void check_black_end(AVFilterContext *ctx)
Definition: vf_blackdetect.c:137
AV_PIX_FMT_NV21
@ AV_PIX_FMT_NV21
as above, but U and V bytes are swapped
Definition: pixfmt.h:90
AVFilterPad::name
const char * name
Pad name.
Definition: internal.h:60
AV_PIX_FMT_YUV444P9
#define AV_PIX_FMT_YUV444P9
Definition: pixfmt.h:388
BlackDetectContext::nb_threads
int nb_threads
Definition: vf_blackdetect.c:50
AVFilter
Filter definition.
Definition: avfilter.h:145
BlackDetectContext::picture_black_ratio_th
double picture_black_ratio_th
Definition: vf_blackdetect.c:43
BlackDetectContext::black_min_duration
int64_t black_min_duration
minimum duration of detected black, expressed in timebase units
Definition: vf_blackdetect.c:37
AV_PIX_FMT_NV12
@ AV_PIX_FMT_NV12
planar YUV 4:2:0, 12bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (firs...
Definition: pixfmt.h:89
AV_PIX_FMT_YUVA444P9
#define AV_PIX_FMT_YUVA444P9
Definition: pixfmt.h:425
BlackDetectContext::pixel_black_th_i
unsigned int pixel_black_th_i
Definition: vf_blackdetect.c:45
blackdetect_outputs
static const AVFilterPad blackdetect_outputs[]
Definition: vf_blackdetect.c:253
AV_PIX_FMT_YUV420P12
#define AV_PIX_FMT_YUV420P12
Definition: pixfmt.h:393
AV_PIX_FMT_YUV422P14
#define AV_PIX_FMT_YUV422P14
Definition: pixfmt.h:398
AVFrame::height
int height
Definition: frame.h:361
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:251
BlackDetectContext::nb_black_pixels
unsigned int nb_black_pixels
number of black pixels counted so far
Definition: vf_blackdetect.c:47
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AV_PIX_FMT_YUVA422P12
#define AV_PIX_FMT_YUVA422P12
Definition: pixfmt.h:429
avfilter.h
AVFrame::metadata
AVDictionary * metadata
metadata.
Definition: frame.h:572
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
factor
static const int factor[16]
Definition: vf_pp7.c:77
filter_frame
static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
Definition: vf_blackdetect.c:188
AVFILTER_FLAG_SLICE_THREADS
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
Definition: avfilter.h:117
desc
const char * desc
Definition: libsvtav1.c:79
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
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:70
AVFILTER_DEFINE_CLASS
AVFILTER_DEFINE_CLASS(blackdetect)
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
av_dict_set
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
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
timestamp.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
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
av_ts2str
#define av_ts2str(ts)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: timestamp.h:54
AV_PIX_FMT_YUV440P12
#define AV_PIX_FMT_YUV440P12
Definition: pixfmt.h:395
h
h
Definition: vp9dsp_template.c:2038
AV_PIX_FMT_YUV444P14
#define AV_PIX_FMT_YUV444P14
Definition: pixfmt.h:399
AV_PIX_FMT_GRAY12
#define AV_PIX_FMT_GRAY12
Definition: pixfmt.h:371
OFFSET
#define OFFSET(x)
Definition: vf_blackdetect.c:54
AV_PIX_FMT_YUVA422P
@ AV_PIX_FMT_YUVA422P
planar YUV 4:2:2 24bpp, (1 Cr & Cb sample per 2x1 Y & A samples)
Definition: pixfmt.h:166
AV_PIX_FMT_YUV420P14
#define AV_PIX_FMT_YUV420P14
Definition: pixfmt.h:397
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: vf_blackdetect.c:76